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PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / tty / synclink_gt.c
blobc359a91f7346071396e7ba0ec9d3f4bb4a381772
1 /*
2 * Device driver for Microgate SyncLink GT serial adapters.
3 *
4 * written by Paul Fulghum for Microgate Corporation
5 * paulkf@microgate.com
6 *
7 * Microgate and SyncLink are trademarks of Microgate Corporation
8 *
9 * This code is released under the GNU General Public License (GPL)
10 *
11 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
12 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
13 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
14 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
15 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
16 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
17 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
18 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
19 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
20 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
21 * OF THE POSSIBILITY OF SUCH DAMAGE.
22 */
23
24 /*
25 * DEBUG OUTPUT DEFINITIONS
26 *
27 * uncomment lines below to enable specific types of debug output
28 *
29 * DBGINFO information - most verbose output
30 * DBGERR serious errors
31 * DBGBH bottom half service routine debugging
32 * DBGISR interrupt service routine debugging
33 * DBGDATA output receive and transmit data
34 * DBGTBUF output transmit DMA buffers and registers
35 * DBGRBUF output receive DMA buffers and registers
36 */
37
38 #define DBGINFO(fmt) if (debug_level >= DEBUG_LEVEL_INFO) printk fmt
39 #define DBGERR(fmt) if (debug_level >= DEBUG_LEVEL_ERROR) printk fmt
40 #define DBGBH(fmt) if (debug_level >= DEBUG_LEVEL_BH) printk fmt
41 #define DBGISR(fmt) if (debug_level >= DEBUG_LEVEL_ISR) printk fmt
42 #define DBGDATA(info, buf, size, label) if (debug_level >= DEBUG_LEVEL_DATA) trace_block((info), (buf), (size), (label))
43 /*#define DBGTBUF(info) dump_tbufs(info)*/
44 /*#define DBGRBUF(info) dump_rbufs(info)*/
45
46
47 #include <linux/module.h>
48 #include <linux/errno.h>
49 #include <linux/signal.h>
50 #include <linux/sched.h>
51 #include <linux/timer.h>
52 #include <linux/interrupt.h>
53 #include <linux/pci.h>
54 #include <linux/tty.h>
55 #include <linux/tty_flip.h>
56 #include <linux/serial.h>
57 #include <linux/major.h>
58 #include <linux/string.h>
59 #include <linux/fcntl.h>
60 #include <linux/ptrace.h>
61 #include <linux/ioport.h>
62 #include <linux/mm.h>
63 #include <linux/seq_file.h>
64 #include <linux/slab.h>
65 #include <linux/netdevice.h>
66 #include <linux/vmalloc.h>
67 #include <linux/init.h>
68 #include <linux/delay.h>
69 #include <linux/ioctl.h>
70 #include <linux/termios.h>
71 #include <linux/bitops.h>
72 #include <linux/workqueue.h>
73 #include <linux/hdlc.h>
74 #include <linux/synclink.h>
75
76 #include <asm/io.h>
77 #include <asm/irq.h>
78 #include <asm/dma.h>
79 #include <asm/types.h>
80 #include <asm/uaccess.h>
81
82 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_GT_MODULE))
83 #define SYNCLINK_GENERIC_HDLC 1
84 #else
85 #define SYNCLINK_GENERIC_HDLC 0
86 #endif
87
88 /*
89 * module identification
90 */
91 static char *driver_name = "SyncLink GT";
92 static char *tty_driver_name = "synclink_gt";
93 static char *tty_dev_prefix = "ttySLG";
94 MODULE_LICENSE("GPL");
95 #define MGSL_MAGIC 0x5401
96 #define MAX_DEVICES 32
97
98 static struct pci_device_id pci_table[] = {
99 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
100 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT2_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
101 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT4_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
102 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_AC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
103 {0,}, /* terminate list */
104 };
105 MODULE_DEVICE_TABLE(pci, pci_table);
106
107 static int init_one(struct pci_dev *dev,const struct pci_device_id *ent);
108 static void remove_one(struct pci_dev *dev);
109 static struct pci_driver pci_driver = {
110 .name = "synclink_gt",
111 .id_table = pci_table,
112 .probe = init_one,
113 .remove = remove_one,
114 };
115
116 static bool pci_registered;
117
118 /*
119 * module configuration and status
120 */
121 static struct slgt_info *slgt_device_list;
122 static int slgt_device_count;
123
124 static int ttymajor;
125 static int debug_level;
126 static int maxframe[MAX_DEVICES];
127
128 module_param(ttymajor, int, 0);
129 module_param(debug_level, int, 0);
130 module_param_array(maxframe, int, NULL, 0);
131
132 MODULE_PARM_DESC(ttymajor, "TTY major device number override: 0=auto assigned");
133 MODULE_PARM_DESC(debug_level, "Debug syslog output: 0=disabled, 1 to 5=increasing detail");
134 MODULE_PARM_DESC(maxframe, "Maximum frame size used by device (4096 to 65535)");
135
136 /*
137 * tty support and callbacks
138 */
139 static struct tty_driver *serial_driver;
140
141 static int open(struct tty_struct *tty, struct file * filp);
142 static void close(struct tty_struct *tty, struct file * filp);
143 static void hangup(struct tty_struct *tty);
144 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
145
146 static int write(struct tty_struct *tty, const unsigned char *buf, int count);
147 static int put_char(struct tty_struct *tty, unsigned char ch);
148 static void send_xchar(struct tty_struct *tty, char ch);
149 static void wait_until_sent(struct tty_struct *tty, int timeout);
150 static int write_room(struct tty_struct *tty);
151 static void flush_chars(struct tty_struct *tty);
152 static void flush_buffer(struct tty_struct *tty);
153 static void tx_hold(struct tty_struct *tty);
154 static void tx_release(struct tty_struct *tty);
155
156 static int ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg);
157 static int chars_in_buffer(struct tty_struct *tty);
158 static void throttle(struct tty_struct * tty);
159 static void unthrottle(struct tty_struct * tty);
160 static int set_break(struct tty_struct *tty, int break_state);
161
162 /*
163 * generic HDLC support and callbacks
164 */
165 #if SYNCLINK_GENERIC_HDLC
166 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
167 static void hdlcdev_tx_done(struct slgt_info *info);
168 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size);
169 static int hdlcdev_init(struct slgt_info *info);
170 static void hdlcdev_exit(struct slgt_info *info);
171 #endif
172
173
174 /*
175 * device specific structures, macros and functions
176 */
177
178 #define SLGT_MAX_PORTS 4
179 #define SLGT_REG_SIZE 256
180
181 /*
182 * conditional wait facility
183 */
184 struct cond_wait {
185 struct cond_wait *next;
186 wait_queue_head_t q;
187 wait_queue_t wait;
188 unsigned int data;
189 };
190 static void init_cond_wait(struct cond_wait *w, unsigned int data);
191 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w);
192 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *w);
193 static void flush_cond_wait(struct cond_wait **head);
194
195 /*
196 * DMA buffer descriptor and access macros
197 */
198 struct slgt_desc
199 {
200 __le16 count;
201 __le16 status;
202 __le32 pbuf; /* physical address of data buffer */
203 __le32 next; /* physical address of next descriptor */
204
205 /* driver book keeping */
206 char *buf; /* virtual address of data buffer */
207 unsigned int pdesc; /* physical address of this descriptor */
208 dma_addr_t buf_dma_addr;
209 unsigned short buf_count;
210 };
211
212 #define set_desc_buffer(a,b) (a).pbuf = cpu_to_le32((unsigned int)(b))
213 #define set_desc_next(a,b) (a).next = cpu_to_le32((unsigned int)(b))
214 #define set_desc_count(a,b)(a).count = cpu_to_le16((unsigned short)(b))
215 #define set_desc_eof(a,b) (a).status = cpu_to_le16((b) ? (le16_to_cpu((a).status) | BIT0) : (le16_to_cpu((a).status) & ~BIT0))
216 #define set_desc_status(a, b) (a).status = cpu_to_le16((unsigned short)(b))
217 #define desc_count(a) (le16_to_cpu((a).count))
218 #define desc_status(a) (le16_to_cpu((a).status))
219 #define desc_complete(a) (le16_to_cpu((a).status) & BIT15)
220 #define desc_eof(a) (le16_to_cpu((a).status) & BIT2)
221 #define desc_crc_error(a) (le16_to_cpu((a).status) & BIT1)
222 #define desc_abort(a) (le16_to_cpu((a).status) & BIT0)
223 #define desc_residue(a) ((le16_to_cpu((a).status) & 0x38) >> 3)
224
225 struct _input_signal_events {
226 int ri_up;
227 int ri_down;
228 int dsr_up;
229 int dsr_down;
230 int dcd_up;
231 int dcd_down;
232 int cts_up;
233 int cts_down;
234 };
235
236 /*
237 * device instance data structure
238 */
239 struct slgt_info {
240 void *if_ptr; /* General purpose pointer (used by SPPP) */
241 struct tty_port port;
242
243 struct slgt_info *next_device; /* device list link */
244
245 int magic;
246
247 char device_name[25];
248 struct pci_dev *pdev;
249
250 int port_count; /* count of ports on adapter */
251 int adapter_num; /* adapter instance number */
252 int port_num; /* port instance number */
253
254 /* array of pointers to port contexts on this adapter */
255 struct slgt_info *port_array[SLGT_MAX_PORTS];
256
257 int line; /* tty line instance number */
258
259 struct mgsl_icount icount;
260
261 int timeout;
262 int x_char; /* xon/xoff character */
263 unsigned int read_status_mask;
264 unsigned int ignore_status_mask;
265
266 wait_queue_head_t status_event_wait_q;
267 wait_queue_head_t event_wait_q;
268 struct timer_list tx_timer;
269 struct timer_list rx_timer;
270
271 unsigned int gpio_present;
272 struct cond_wait *gpio_wait_q;
273
274 spinlock_t lock; /* spinlock for synchronizing with ISR */
275
276 struct work_struct task;
277 u32 pending_bh;
278 bool bh_requested;
279 bool bh_running;
280
281 int isr_overflow;
282 bool irq_requested; /* true if IRQ requested */
283 bool irq_occurred; /* for diagnostics use */
284
285 /* device configuration */
286
287 unsigned int bus_type;
288 unsigned int irq_level;
289 unsigned long irq_flags;
290
291 unsigned char __iomem * reg_addr; /* memory mapped registers address */
292 u32 phys_reg_addr;
293 bool reg_addr_requested;
294
295 MGSL_PARAMS params; /* communications parameters */
296 u32 idle_mode;
297 u32 max_frame_size; /* as set by device config */
298
299 unsigned int rbuf_fill_level;
300 unsigned int rx_pio;
301 unsigned int if_mode;
302 unsigned int base_clock;
303 unsigned int xsync;
304 unsigned int xctrl;
305
306 /* device status */
307
308 bool rx_enabled;
309 bool rx_restart;
310
311 bool tx_enabled;
312 bool tx_active;
313
314 unsigned char signals; /* serial signal states */
315 int init_error; /* initialization error */
316
317 unsigned char *tx_buf;
318 int tx_count;
319
320 char *flag_buf;
321 bool drop_rts_on_tx_done;
322 struct _input_signal_events input_signal_events;
323
324 int dcd_chkcount; /* check counts to prevent */
325 int cts_chkcount; /* too many IRQs if a signal */
326 int dsr_chkcount; /* is floating */
327 int ri_chkcount;
328
329 char *bufs; /* virtual address of DMA buffer lists */
330 dma_addr_t bufs_dma_addr; /* physical address of buffer descriptors */
331
332 unsigned int rbuf_count;
333 struct slgt_desc *rbufs;
334 unsigned int rbuf_current;
335 unsigned int rbuf_index;
336 unsigned int rbuf_fill_index;
337 unsigned short rbuf_fill_count;
338
339 unsigned int tbuf_count;
340 struct slgt_desc *tbufs;
341 unsigned int tbuf_current;
342 unsigned int tbuf_start;
343
344 unsigned char *tmp_rbuf;
345 unsigned int tmp_rbuf_count;
346
347 /* SPPP/Cisco HDLC device parts */
348
349 int netcount;
350 spinlock_t netlock;
351 #if SYNCLINK_GENERIC_HDLC
352 struct net_device *netdev;
353 #endif
354
355 };
356
357 static MGSL_PARAMS default_params = {
358 .mode = MGSL_MODE_HDLC,
359 .loopback = 0,
360 .flags = HDLC_FLAG_UNDERRUN_ABORT15,
361 .encoding = HDLC_ENCODING_NRZI_SPACE,
362 .clock_speed = 0,
363 .addr_filter = 0xff,
364 .crc_type = HDLC_CRC_16_CCITT,
365 .preamble_length = HDLC_PREAMBLE_LENGTH_8BITS,
366 .preamble = HDLC_PREAMBLE_PATTERN_NONE,
367 .data_rate = 9600,
368 .data_bits = 8,
369 .stop_bits = 1,
370 .parity = ASYNC_PARITY_NONE
371 };
372
373
374 #define BH_RECEIVE 1
375 #define BH_TRANSMIT 2
376 #define BH_STATUS 4
377 #define IO_PIN_SHUTDOWN_LIMIT 100
378
379 #define DMABUFSIZE 256
380 #define DESC_LIST_SIZE 4096
381
382 #define MASK_PARITY BIT1
383 #define MASK_FRAMING BIT0
384 #define MASK_BREAK BIT14
385 #define MASK_OVERRUN BIT4
386
387 #define GSR 0x00 /* global status */
388 #define JCR 0x04 /* JTAG control */
389 #define IODR 0x08 /* GPIO direction */
390 #define IOER 0x0c /* GPIO interrupt enable */
391 #define IOVR 0x10 /* GPIO value */
392 #define IOSR 0x14 /* GPIO interrupt status */
393 #define TDR 0x80 /* tx data */
394 #define RDR 0x80 /* rx data */
395 #define TCR 0x82 /* tx control */
396 #define TIR 0x84 /* tx idle */
397 #define TPR 0x85 /* tx preamble */
398 #define RCR 0x86 /* rx control */
399 #define VCR 0x88 /* V.24 control */
400 #define CCR 0x89 /* clock control */
401 #define BDR 0x8a /* baud divisor */
402 #define SCR 0x8c /* serial control */
403 #define SSR 0x8e /* serial status */
404 #define RDCSR 0x90 /* rx DMA control/status */
405 #define TDCSR 0x94 /* tx DMA control/status */
406 #define RDDAR 0x98 /* rx DMA descriptor address */
407 #define TDDAR 0x9c /* tx DMA descriptor address */
408 #define XSR 0x40 /* extended sync pattern */
409 #define XCR 0x44 /* extended control */
410
411 #define RXIDLE BIT14
412 #define RXBREAK BIT14
413 #define IRQ_TXDATA BIT13
414 #define IRQ_TXIDLE BIT12
415 #define IRQ_TXUNDER BIT11 /* HDLC */
416 #define IRQ_RXDATA BIT10
417 #define IRQ_RXIDLE BIT9 /* HDLC */
418 #define IRQ_RXBREAK BIT9 /* async */
419 #define IRQ_RXOVER BIT8
420 #define IRQ_DSR BIT7
421 #define IRQ_CTS BIT6
422 #define IRQ_DCD BIT5
423 #define IRQ_RI BIT4
424 #define IRQ_ALL 0x3ff0
425 #define IRQ_MASTER BIT0
426
427 #define slgt_irq_on(info, mask) \
428 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) | (mask)))
429 #define slgt_irq_off(info, mask) \
430 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) & ~(mask)))
431
432 static __u8 rd_reg8(struct slgt_info *info, unsigned int addr);
433 static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value);
434 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr);
435 static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value);
436 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr);
437 static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value);
438
439 static void msc_set_vcr(struct slgt_info *info);
440
441 static int startup(struct slgt_info *info);
442 static int block_til_ready(struct tty_struct *tty, struct file * filp,struct slgt_info *info);
443 static void shutdown(struct slgt_info *info);
444 static void program_hw(struct slgt_info *info);
445 static void change_params(struct slgt_info *info);
446
447 static int register_test(struct slgt_info *info);
448 static int irq_test(struct slgt_info *info);
449 static int loopback_test(struct slgt_info *info);
450 static int adapter_test(struct slgt_info *info);
451
452 static void reset_adapter(struct slgt_info *info);
453 static void reset_port(struct slgt_info *info);
454 static void async_mode(struct slgt_info *info);
455 static void sync_mode(struct slgt_info *info);
456
457 static void rx_stop(struct slgt_info *info);
458 static void rx_start(struct slgt_info *info);
459 static void reset_rbufs(struct slgt_info *info);
460 static void free_rbufs(struct slgt_info *info, unsigned int first, unsigned int last);
461 static void rdma_reset(struct slgt_info *info);
462 static bool rx_get_frame(struct slgt_info *info);
463 static bool rx_get_buf(struct slgt_info *info);
464
465 static void tx_start(struct slgt_info *info);
466 static void tx_stop(struct slgt_info *info);
467 static void tx_set_idle(struct slgt_info *info);
468 static unsigned int free_tbuf_count(struct slgt_info *info);
469 static unsigned int tbuf_bytes(struct slgt_info *info);
470 static void reset_tbufs(struct slgt_info *info);
471 static void tdma_reset(struct slgt_info *info);
472 static bool tx_load(struct slgt_info *info, const char *buf, unsigned int count);
473
474 static void get_signals(struct slgt_info *info);
475 static void set_signals(struct slgt_info *info);
476 static void enable_loopback(struct slgt_info *info);
477 static void set_rate(struct slgt_info *info, u32 data_rate);
478
479 static int bh_action(struct slgt_info *info);
480 static void bh_handler(struct work_struct *work);
481 static void bh_transmit(struct slgt_info *info);
482 static void isr_serial(struct slgt_info *info);
483 static void isr_rdma(struct slgt_info *info);
484 static void isr_txeom(struct slgt_info *info, unsigned short status);
485 static void isr_tdma(struct slgt_info *info);
486
487 static int alloc_dma_bufs(struct slgt_info *info);
488 static void free_dma_bufs(struct slgt_info *info);
489 static int alloc_desc(struct slgt_info *info);
490 static void free_desc(struct slgt_info *info);
491 static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
492 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
493
494 static int alloc_tmp_rbuf(struct slgt_info *info);
495 static void free_tmp_rbuf(struct slgt_info *info);
496
497 static void tx_timeout(unsigned long context);
498 static void rx_timeout(unsigned long context);
499
500 /*
501 * ioctl handlers
502 */
503 static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount);
504 static int get_params(struct slgt_info *info, MGSL_PARAMS __user *params);
505 static int set_params(struct slgt_info *info, MGSL_PARAMS __user *params);
506 static int get_txidle(struct slgt_info *info, int __user *idle_mode);
507 static int set_txidle(struct slgt_info *info, int idle_mode);
508 static int tx_enable(struct slgt_info *info, int enable);
509 static int tx_abort(struct slgt_info *info);
510 static int rx_enable(struct slgt_info *info, int enable);
511 static int modem_input_wait(struct slgt_info *info,int arg);
512 static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr);
513 static int tiocmget(struct tty_struct *tty);
514 static int tiocmset(struct tty_struct *tty,
515 unsigned int set, unsigned int clear);
516 static int set_break(struct tty_struct *tty, int break_state);
517 static int get_interface(struct slgt_info *info, int __user *if_mode);
518 static int set_interface(struct slgt_info *info, int if_mode);
519 static int set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
520 static int get_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
521 static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
522 static int get_xsync(struct slgt_info *info, int __user *if_mode);
523 static int set_xsync(struct slgt_info *info, int if_mode);
524 static int get_xctrl(struct slgt_info *info, int __user *if_mode);
525 static int set_xctrl(struct slgt_info *info, int if_mode);
526
527 /*
528 * driver functions
529 */
530 static void add_device(struct slgt_info *info);
531 static void device_init(int adapter_num, struct pci_dev *pdev);
532 static int claim_resources(struct slgt_info *info);
533 static void release_resources(struct slgt_info *info);
534
535 /*
536 * DEBUG OUTPUT CODE
537 */
538 #ifndef DBGINFO
539 #define DBGINFO(fmt)
540 #endif
541 #ifndef DBGERR
542 #define DBGERR(fmt)
543 #endif
544 #ifndef DBGBH
545 #define DBGBH(fmt)
546 #endif
547 #ifndef DBGISR
548 #define DBGISR(fmt)
549 #endif
550
551 #ifdef DBGDATA
552 static void trace_block(struct slgt_info *info, const char *data, int count, const char *label)
553 {
554 int i;
555 int linecount;
556 printk("%s %s data:\n",info->device_name, label);
557 while(count) {
558 linecount = (count > 16) ? 16 : count;
559 for(i=0; i < linecount; i++)
560 printk("%02X ",(unsigned char)data[i]);
561 for(;i<17;i++)
562 printk(" ");
563 for(i=0;i<linecount;i++) {
564 if (data[i]>=040 && data[i]<=0176)
565 printk("%c",data[i]);
566 else
567 printk(".");
568 }
569 printk("\n");
570 data += linecount;
571 count -= linecount;
572 }
573 }
574 #else
575 #define DBGDATA(info, buf, size, label)
576 #endif
577
578 #ifdef DBGTBUF
579 static void dump_tbufs(struct slgt_info *info)
580 {
581 int i;
582 printk("tbuf_current=%d\n", info->tbuf_current);
583 for (i=0 ; i < info->tbuf_count ; i++) {
584 printk("%d: count=%04X status=%04X\n",
585 i, le16_to_cpu(info->tbufs[i].count), le16_to_cpu(info->tbufs[i].status));
586 }
587 }
588 #else
589 #define DBGTBUF(info)
590 #endif
591
592 #ifdef DBGRBUF
593 static void dump_rbufs(struct slgt_info *info)
594 {
595 int i;
596 printk("rbuf_current=%d\n", info->rbuf_current);
597 for (i=0 ; i < info->rbuf_count ; i++) {
598 printk("%d: count=%04X status=%04X\n",
599 i, le16_to_cpu(info->rbufs[i].count), le16_to_cpu(info->rbufs[i].status));
600 }
601 }
602 #else
603 #define DBGRBUF(info)
604 #endif
605
606 static inline int sanity_check(struct slgt_info *info, char *devname, const char *name)
607 {
608 #ifdef SANITY_CHECK
609 if (!info) {
610 printk("null struct slgt_info for (%s) in %s\n", devname, name);
611 return 1;
612 }
613 if (info->magic != MGSL_MAGIC) {
614 printk("bad magic number struct slgt_info (%s) in %s\n", devname, name);
615 return 1;
616 }
617 #else
618 if (!info)
619 return 1;
620 #endif
621 return 0;
622 }
623
624 /**
625 * line discipline callback wrappers
626 *
627 * The wrappers maintain line discipline references
628 * while calling into the line discipline.
629 *
630 * ldisc_receive_buf - pass receive data to line discipline
631 */
632 static void ldisc_receive_buf(struct tty_struct *tty,
633 const __u8 *data, char *flags, int count)
634 {
635 struct tty_ldisc *ld;
636 if (!tty)
637 return;
638 ld = tty_ldisc_ref(tty);
639 if (ld) {
640 if (ld->ops->receive_buf)
641 ld->ops->receive_buf(tty, data, flags, count);
642 tty_ldisc_deref(ld);
643 }
644 }
645
646 /* tty callbacks */
647
648 static int open(struct tty_struct *tty, struct file *filp)
649 {
650 struct slgt_info *info;
651 int retval, line;
652 unsigned long flags;
653
654 line = tty->index;
655 if (line >= slgt_device_count) {
656 DBGERR(("%s: open with invalid line #%d.\n", driver_name, line));
657 return -ENODEV;
658 }
659
660 info = slgt_device_list;
661 while(info && info->line != line)
662 info = info->next_device;
663 if (sanity_check(info, tty->name, "open"))
664 return -ENODEV;
665 if (info->init_error) {
666 DBGERR(("%s init error=%d\n", info->device_name, info->init_error));
667 return -ENODEV;
668 }
669
670 tty->driver_data = info;
671 info->port.tty = tty;
672
673 DBGINFO(("%s open, old ref count = %d\n", info->device_name, info->port.count));
674
675 /* If port is closing, signal caller to try again */
676 if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
677 wait_event_interruptible_tty(tty, info->port.close_wait,
678 !(info->port.flags & ASYNC_CLOSING));
679 retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
680 -EAGAIN : -ERESTARTSYS);
681 goto cleanup;
682 }
683
684 mutex_lock(&info->port.mutex);
685 info->port.low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
686
687 spin_lock_irqsave(&info->netlock, flags);
688 if (info->netcount) {
689 retval = -EBUSY;
690 spin_unlock_irqrestore(&info->netlock, flags);
691 mutex_unlock(&info->port.mutex);
692 goto cleanup;
693 }
694 info->port.count++;
695 spin_unlock_irqrestore(&info->netlock, flags);
696
697 if (info->port.count == 1) {
698 /* 1st open on this device, init hardware */
699 retval = startup(info);
700 if (retval < 0) {
701 mutex_unlock(&info->port.mutex);
702 goto cleanup;
703 }
704 }
705 mutex_unlock(&info->port.mutex);
706 retval = block_til_ready(tty, filp, info);
707 if (retval) {
708 DBGINFO(("%s block_til_ready rc=%d\n", info->device_name, retval));
709 goto cleanup;
710 }
711
712 retval = 0;
713
714 cleanup:
715 if (retval) {
716 if (tty->count == 1)
717 info->port.tty = NULL; /* tty layer will release tty struct */
718 if(info->port.count)
719 info->port.count--;
720 }
721
722 DBGINFO(("%s open rc=%d\n", info->device_name, retval));
723 return retval;
724 }
725
726 static void close(struct tty_struct *tty, struct file *filp)
727 {
728 struct slgt_info *info = tty->driver_data;
729
730 if (sanity_check(info, tty->name, "close"))
731 return;
732 DBGINFO(("%s close entry, count=%d\n", info->device_name, info->port.count));
733
734 if (tty_port_close_start(&info->port, tty, filp) == 0)
735 goto cleanup;
736
737 mutex_lock(&info->port.mutex);
738 if (info->port.flags & ASYNC_INITIALIZED)
739 wait_until_sent(tty, info->timeout);
740 flush_buffer(tty);
741 tty_ldisc_flush(tty);
742
743 shutdown(info);
744 mutex_unlock(&info->port.mutex);
745
746 tty_port_close_end(&info->port, tty);
747 info->port.tty = NULL;
748 cleanup:
749 DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->port.count));
750 }
751
752 static void hangup(struct tty_struct *tty)
753 {
754 struct slgt_info *info = tty->driver_data;
755 unsigned long flags;
756
757 if (sanity_check(info, tty->name, "hangup"))
758 return;
759 DBGINFO(("%s hangup\n", info->device_name));
760
761 flush_buffer(tty);
762
763 mutex_lock(&info->port.mutex);
764 shutdown(info);
765
766 spin_lock_irqsave(&info->port.lock, flags);
767 info->port.count = 0;
768 info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
769 info->port.tty = NULL;
770 spin_unlock_irqrestore(&info->port.lock, flags);
771 mutex_unlock(&info->port.mutex);
772
773 wake_up_interruptible(&info->port.open_wait);
774 }
775
776 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
777 {
778 struct slgt_info *info = tty->driver_data;
779 unsigned long flags;
780
781 DBGINFO(("%s set_termios\n", tty->driver->name));
782
783 change_params(info);
784
785 /* Handle transition to B0 status */
786 if (old_termios->c_cflag & CBAUD &&
787 !(tty->termios.c_cflag & CBAUD)) {
788 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
789 spin_lock_irqsave(&info->lock,flags);
790 set_signals(info);
791 spin_unlock_irqrestore(&info->lock,flags);
792 }
793
794 /* Handle transition away from B0 status */
795 if (!(old_termios->c_cflag & CBAUD) &&
796 tty->termios.c_cflag & CBAUD) {
797 info->signals |= SerialSignal_DTR;
798 if (!(tty->termios.c_cflag & CRTSCTS) ||
799 !test_bit(TTY_THROTTLED, &tty->flags)) {
800 info->signals |= SerialSignal_RTS;
801 }
802 spin_lock_irqsave(&info->lock,flags);
803 set_signals(info);
804 spin_unlock_irqrestore(&info->lock,flags);
805 }
806
807 /* Handle turning off CRTSCTS */
808 if (old_termios->c_cflag & CRTSCTS &&
809 !(tty->termios.c_cflag & CRTSCTS)) {
810 tty->hw_stopped = 0;
811 tx_release(tty);
812 }
813 }
814
815 static void update_tx_timer(struct slgt_info *info)
816 {
817 /*
818 * use worst case speed of 1200bps to calculate transmit timeout
819 * based on data in buffers (tbuf_bytes) and FIFO (128 bytes)
820 */
821 if (info->params.mode == MGSL_MODE_HDLC) {
822 int timeout = (tbuf_bytes(info) * 7) + 1000;
823 mod_timer(&info->tx_timer, jiffies + msecs_to_jiffies(timeout));
824 }
825 }
826
827 static int write(struct tty_struct *tty,
828 const unsigned char *buf, int count)
829 {
830 int ret = 0;
831 struct slgt_info *info = tty->driver_data;
832 unsigned long flags;
833
834 if (sanity_check(info, tty->name, "write"))
835 return -EIO;
836
837 DBGINFO(("%s write count=%d\n", info->device_name, count));
838
839 if (!info->tx_buf || (count > info->max_frame_size))
840 return -EIO;
841
842 if (!count || tty->stopped || tty->hw_stopped)
843 return 0;
844
845 spin_lock_irqsave(&info->lock, flags);
846
847 if (info->tx_count) {
848 /* send accumulated data from send_char() */
849 if (!tx_load(info, info->tx_buf, info->tx_count))
850 goto cleanup;
851 info->tx_count = 0;
852 }
853
854 if (tx_load(info, buf, count))
855 ret = count;
856
857 cleanup:
858 spin_unlock_irqrestore(&info->lock, flags);
859 DBGINFO(("%s write rc=%d\n", info->device_name, ret));
860 return ret;
861 }
862
863 static int put_char(struct tty_struct *tty, unsigned char ch)
864 {
865 struct slgt_info *info = tty->driver_data;
866 unsigned long flags;
867 int ret = 0;
868
869 if (sanity_check(info, tty->name, "put_char"))
870 return 0;
871 DBGINFO(("%s put_char(%d)\n", info->device_name, ch));
872 if (!info->tx_buf)
873 return 0;
874 spin_lock_irqsave(&info->lock,flags);
875 if (info->tx_count < info->max_frame_size) {
876 info->tx_buf[info->tx_count++] = ch;
877 ret = 1;
878 }
879 spin_unlock_irqrestore(&info->lock,flags);
880 return ret;
881 }
882
883 static void send_xchar(struct tty_struct *tty, char ch)
884 {
885 struct slgt_info *info = tty->driver_data;
886 unsigned long flags;
887
888 if (sanity_check(info, tty->name, "send_xchar"))
889 return;
890 DBGINFO(("%s send_xchar(%d)\n", info->device_name, ch));
891 info->x_char = ch;
892 if (ch) {
893 spin_lock_irqsave(&info->lock,flags);
894 if (!info->tx_enabled)
895 tx_start(info);
896 spin_unlock_irqrestore(&info->lock,flags);
897 }
898 }
899
900 static void wait_until_sent(struct tty_struct *tty, int timeout)
901 {
902 struct slgt_info *info = tty->driver_data;
903 unsigned long orig_jiffies, char_time;
904
905 if (!info )
906 return;
907 if (sanity_check(info, tty->name, "wait_until_sent"))
908 return;
909 DBGINFO(("%s wait_until_sent entry\n", info->device_name));
910 if (!(info->port.flags & ASYNC_INITIALIZED))
911 goto exit;
912
913 orig_jiffies = jiffies;
914
915 /* Set check interval to 1/5 of estimated time to
916 * send a character, and make it at least 1. The check
917 * interval should also be less than the timeout.
918 * Note: use tight timings here to satisfy the NIST-PCTS.
919 */
920
921 if (info->params.data_rate) {
922 char_time = info->timeout/(32 * 5);
923 if (!char_time)
924 char_time++;
925 } else
926 char_time = 1;
927
928 if (timeout)
929 char_time = min_t(unsigned long, char_time, timeout);
930
931 while (info->tx_active) {
932 msleep_interruptible(jiffies_to_msecs(char_time));
933 if (signal_pending(current))
934 break;
935 if (timeout && time_after(jiffies, orig_jiffies + timeout))
936 break;
937 }
938 exit:
939 DBGINFO(("%s wait_until_sent exit\n", info->device_name));
940 }
941
942 static int write_room(struct tty_struct *tty)
943 {
944 struct slgt_info *info = tty->driver_data;
945 int ret;
946
947 if (sanity_check(info, tty->name, "write_room"))
948 return 0;
949 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
950 DBGINFO(("%s write_room=%d\n", info->device_name, ret));
951 return ret;
952 }
953
954 static void flush_chars(struct tty_struct *tty)
955 {
956 struct slgt_info *info = tty->driver_data;
957 unsigned long flags;
958
959 if (sanity_check(info, tty->name, "flush_chars"))
960 return;
961 DBGINFO(("%s flush_chars entry tx_count=%d\n", info->device_name, info->tx_count));
962
963 if (info->tx_count <= 0 || tty->stopped ||
964 tty->hw_stopped || !info->tx_buf)
965 return;
966
967 DBGINFO(("%s flush_chars start transmit\n", info->device_name));
968
969 spin_lock_irqsave(&info->lock,flags);
970 if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count))
971 info->tx_count = 0;
972 spin_unlock_irqrestore(&info->lock,flags);
973 }
974
975 static void flush_buffer(struct tty_struct *tty)
976 {
977 struct slgt_info *info = tty->driver_data;
978 unsigned long flags;
979
980 if (sanity_check(info, tty->name, "flush_buffer"))
981 return;
982 DBGINFO(("%s flush_buffer\n", info->device_name));
983
984 spin_lock_irqsave(&info->lock, flags);
985 info->tx_count = 0;
986 spin_unlock_irqrestore(&info->lock, flags);
987
988 tty_wakeup(tty);
989 }
990
991 /*
992 * throttle (stop) transmitter
993 */
994 static void tx_hold(struct tty_struct *tty)
995 {
996 struct slgt_info *info = tty->driver_data;
997 unsigned long flags;
998
999 if (sanity_check(info, tty->name, "tx_hold"))
1000 return;
1001 DBGINFO(("%s tx_hold\n", info->device_name));
1002 spin_lock_irqsave(&info->lock,flags);
1003 if (info->tx_enabled && info->params.mode == MGSL_MODE_ASYNC)
1004 tx_stop(info);
1005 spin_unlock_irqrestore(&info->lock,flags);
1006 }
1007
1008 /*
1009 * release (start) transmitter
1010 */
1011 static void tx_release(struct tty_struct *tty)
1012 {
1013 struct slgt_info *info = tty->driver_data;
1014 unsigned long flags;
1015
1016 if (sanity_check(info, tty->name, "tx_release"))
1017 return;
1018 DBGINFO(("%s tx_release\n", info->device_name));
1019 spin_lock_irqsave(&info->lock, flags);
1020 if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count))
1021 info->tx_count = 0;
1022 spin_unlock_irqrestore(&info->lock, flags);
1023 }
1024
1025 /*
1026 * Service an IOCTL request
1027 *
1028 * Arguments
1029 *
1030 * tty pointer to tty instance data
1031 * cmd IOCTL command code
1032 * arg command argument/context
1033 *
1034 * Return 0 if success, otherwise error code
1035 */
1036 static int ioctl(struct tty_struct *tty,
1037 unsigned int cmd, unsigned long arg)
1038 {
1039 struct slgt_info *info = tty->driver_data;
1040 void __user *argp = (void __user *)arg;
1041 int ret;
1042
1043 if (sanity_check(info, tty->name, "ioctl"))
1044 return -ENODEV;
1045 DBGINFO(("%s ioctl() cmd=%08X\n", info->device_name, cmd));
1046
1047 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1048 (cmd != TIOCMIWAIT)) {
1049 if (tty->flags & (1 << TTY_IO_ERROR))
1050 return -EIO;
1051 }
1052
1053 switch (cmd) {
1054 case MGSL_IOCWAITEVENT:
1055 return wait_mgsl_event(info, argp);
1056 case TIOCMIWAIT:
1057 return modem_input_wait(info,(int)arg);
1058 case MGSL_IOCSGPIO:
1059 return set_gpio(info, argp);
1060 case MGSL_IOCGGPIO:
1061 return get_gpio(info, argp);
1062 case MGSL_IOCWAITGPIO:
1063 return wait_gpio(info, argp);
1064 case MGSL_IOCGXSYNC:
1065 return get_xsync(info, argp);
1066 case MGSL_IOCSXSYNC:
1067 return set_xsync(info, (int)arg);
1068 case MGSL_IOCGXCTRL:
1069 return get_xctrl(info, argp);
1070 case MGSL_IOCSXCTRL:
1071 return set_xctrl(info, (int)arg);
1072 }
1073 mutex_lock(&info->port.mutex);
1074 switch (cmd) {
1075 case MGSL_IOCGPARAMS:
1076 ret = get_params(info, argp);
1077 break;
1078 case MGSL_IOCSPARAMS:
1079 ret = set_params(info, argp);
1080 break;
1081 case MGSL_IOCGTXIDLE:
1082 ret = get_txidle(info, argp);
1083 break;
1084 case MGSL_IOCSTXIDLE:
1085 ret = set_txidle(info, (int)arg);
1086 break;
1087 case MGSL_IOCTXENABLE:
1088 ret = tx_enable(info, (int)arg);
1089 break;
1090 case MGSL_IOCRXENABLE:
1091 ret = rx_enable(info, (int)arg);
1092 break;
1093 case MGSL_IOCTXABORT:
1094 ret = tx_abort(info);
1095 break;
1096 case MGSL_IOCGSTATS:
1097 ret = get_stats(info, argp);
1098 break;
1099 case MGSL_IOCGIF:
1100 ret = get_interface(info, argp);
1101 break;
1102 case MGSL_IOCSIF:
1103 ret = set_interface(info,(int)arg);
1104 break;
1105 default:
1106 ret = -ENOIOCTLCMD;
1107 }
1108 mutex_unlock(&info->port.mutex);
1109 return ret;
1110 }
1111
1112 static int get_icount(struct tty_struct *tty,
1113 struct serial_icounter_struct *icount)
1114
1115 {
1116 struct slgt_info *info = tty->driver_data;
1117 struct mgsl_icount cnow; /* kernel counter temps */
1118 unsigned long flags;
1119
1120 spin_lock_irqsave(&info->lock,flags);
1121 cnow = info->icount;
1122 spin_unlock_irqrestore(&info->lock,flags);
1123
1124 icount->cts = cnow.cts;
1125 icount->dsr = cnow.dsr;
1126 icount->rng = cnow.rng;
1127 icount->dcd = cnow.dcd;
1128 icount->rx = cnow.rx;
1129 icount->tx = cnow.tx;
1130 icount->frame = cnow.frame;
1131 icount->overrun = cnow.overrun;
1132 icount->parity = cnow.parity;
1133 icount->brk = cnow.brk;
1134 icount->buf_overrun = cnow.buf_overrun;
1135
1136 return 0;
1137 }
1138
1139 /*
1140 * support for 32 bit ioctl calls on 64 bit systems
1141 */
1142 #ifdef CONFIG_COMPAT
1143 static long get_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *user_params)
1144 {
1145 struct MGSL_PARAMS32 tmp_params;
1146
1147 DBGINFO(("%s get_params32\n", info->device_name));
1148 memset(&tmp_params, 0, sizeof(tmp_params));
1149 tmp_params.mode = (compat_ulong_t)info->params.mode;
1150 tmp_params.loopback = info->params.loopback;
1151 tmp_params.flags = info->params.flags;
1152 tmp_params.encoding = info->params.encoding;
1153 tmp_params.clock_speed = (compat_ulong_t)info->params.clock_speed;
1154 tmp_params.addr_filter = info->params.addr_filter;
1155 tmp_params.crc_type = info->params.crc_type;
1156 tmp_params.preamble_length = info->params.preamble_length;
1157 tmp_params.preamble = info->params.preamble;
1158 tmp_params.data_rate = (compat_ulong_t)info->params.data_rate;
1159 tmp_params.data_bits = info->params.data_bits;
1160 tmp_params.stop_bits = info->params.stop_bits;
1161 tmp_params.parity = info->params.parity;
1162 if (copy_to_user(user_params, &tmp_params, sizeof(struct MGSL_PARAMS32)))
1163 return -EFAULT;
1164 return 0;
1165 }
1166
1167 static long set_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *new_params)
1168 {
1169 struct MGSL_PARAMS32 tmp_params;
1170
1171 DBGINFO(("%s set_params32\n", info->device_name));
1172 if (copy_from_user(&tmp_params, new_params, sizeof(struct MGSL_PARAMS32)))
1173 return -EFAULT;
1174
1175 spin_lock(&info->lock);
1176 if (tmp_params.mode == MGSL_MODE_BASE_CLOCK) {
1177 info->base_clock = tmp_params.clock_speed;
1178 } else {
1179 info->params.mode = tmp_params.mode;
1180 info->params.loopback = tmp_params.loopback;
1181 info->params.flags = tmp_params.flags;
1182 info->params.encoding = tmp_params.encoding;
1183 info->params.clock_speed = tmp_params.clock_speed;
1184 info->params.addr_filter = tmp_params.addr_filter;
1185 info->params.crc_type = tmp_params.crc_type;
1186 info->params.preamble_length = tmp_params.preamble_length;
1187 info->params.preamble = tmp_params.preamble;
1188 info->params.data_rate = tmp_params.data_rate;
1189 info->params.data_bits = tmp_params.data_bits;
1190 info->params.stop_bits = tmp_params.stop_bits;
1191 info->params.parity = tmp_params.parity;
1192 }
1193 spin_unlock(&info->lock);
1194
1195 program_hw(info);
1196
1197 return 0;
1198 }
1199
1200 static long slgt_compat_ioctl(struct tty_struct *tty,
1201 unsigned int cmd, unsigned long arg)
1202 {
1203 struct slgt_info *info = tty->driver_data;
1204 int rc = -ENOIOCTLCMD;
1205
1206 if (sanity_check(info, tty->name, "compat_ioctl"))
1207 return -ENODEV;
1208 DBGINFO(("%s compat_ioctl() cmd=%08X\n", info->device_name, cmd));
1209
1210 switch (cmd) {
1211
1212 case MGSL_IOCSPARAMS32:
1213 rc = set_params32(info, compat_ptr(arg));
1214 break;
1215
1216 case MGSL_IOCGPARAMS32:
1217 rc = get_params32(info, compat_ptr(arg));
1218 break;
1219
1220 case MGSL_IOCGPARAMS:
1221 case MGSL_IOCSPARAMS:
1222 case MGSL_IOCGTXIDLE:
1223 case MGSL_IOCGSTATS:
1224 case MGSL_IOCWAITEVENT:
1225 case MGSL_IOCGIF:
1226 case MGSL_IOCSGPIO:
1227 case MGSL_IOCGGPIO:
1228 case MGSL_IOCWAITGPIO:
1229 case MGSL_IOCGXSYNC:
1230 case MGSL_IOCGXCTRL:
1231 case MGSL_IOCSTXIDLE:
1232 case MGSL_IOCTXENABLE:
1233 case MGSL_IOCRXENABLE:
1234 case MGSL_IOCTXABORT:
1235 case TIOCMIWAIT:
1236 case MGSL_IOCSIF:
1237 case MGSL_IOCSXSYNC:
1238 case MGSL_IOCSXCTRL:
1239 rc = ioctl(tty, cmd, arg);
1240 break;
1241 }
1242
1243 DBGINFO(("%s compat_ioctl() cmd=%08X rc=%d\n", info->device_name, cmd, rc));
1244 return rc;
1245 }
1246 #else
1247 #define slgt_compat_ioctl NULL
1248 #endif /* ifdef CONFIG_COMPAT */
1249
1250 /*
1251 * proc fs support
1252 */
1253 static inline void line_info(struct seq_file *m, struct slgt_info *info)
1254 {
1255 char stat_buf[30];
1256 unsigned long flags;
1257
1258 seq_printf(m, "%s: IO=%08X IRQ=%d MaxFrameSize=%u\n",
1259 info->device_name, info->phys_reg_addr,
1260 info->irq_level, info->max_frame_size);
1261
1262 /* output current serial signal states */
1263 spin_lock_irqsave(&info->lock,flags);
1264 get_signals(info);
1265 spin_unlock_irqrestore(&info->lock,flags);
1266
1267 stat_buf[0] = 0;
1268 stat_buf[1] = 0;
1269 if (info->signals & SerialSignal_RTS)
1270 strcat(stat_buf, "|RTS");
1271 if (info->signals & SerialSignal_CTS)
1272 strcat(stat_buf, "|CTS");
1273 if (info->signals & SerialSignal_DTR)
1274 strcat(stat_buf, "|DTR");
1275 if (info->signals & SerialSignal_DSR)
1276 strcat(stat_buf, "|DSR");
1277 if (info->signals & SerialSignal_DCD)
1278 strcat(stat_buf, "|CD");
1279 if (info->signals & SerialSignal_RI)
1280 strcat(stat_buf, "|RI");
1281
1282 if (info->params.mode != MGSL_MODE_ASYNC) {
1283 seq_printf(m, "\tHDLC txok:%d rxok:%d",
1284 info->icount.txok, info->icount.rxok);
1285 if (info->icount.txunder)
1286 seq_printf(m, " txunder:%d", info->icount.txunder);
1287 if (info->icount.txabort)
1288 seq_printf(m, " txabort:%d", info->icount.txabort);
1289 if (info->icount.rxshort)
1290 seq_printf(m, " rxshort:%d", info->icount.rxshort);
1291 if (info->icount.rxlong)
1292 seq_printf(m, " rxlong:%d", info->icount.rxlong);
1293 if (info->icount.rxover)
1294 seq_printf(m, " rxover:%d", info->icount.rxover);
1295 if (info->icount.rxcrc)
1296 seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
1297 } else {
1298 seq_printf(m, "\tASYNC tx:%d rx:%d",
1299 info->icount.tx, info->icount.rx);
1300 if (info->icount.frame)
1301 seq_printf(m, " fe:%d", info->icount.frame);
1302 if (info->icount.parity)
1303 seq_printf(m, " pe:%d", info->icount.parity);
1304 if (info->icount.brk)
1305 seq_printf(m, " brk:%d", info->icount.brk);
1306 if (info->icount.overrun)
1307 seq_printf(m, " oe:%d", info->icount.overrun);
1308 }
1309
1310 /* Append serial signal status to end */
1311 seq_printf(m, " %s\n", stat_buf+1);
1312
1313 seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1314 info->tx_active,info->bh_requested,info->bh_running,
1315 info->pending_bh);
1316 }
1317
1318 /* Called to print information about devices
1319 */
1320 static int synclink_gt_proc_show(struct seq_file *m, void *v)
1321 {
1322 struct slgt_info *info;
1323
1324 seq_puts(m, "synclink_gt driver\n");
1325
1326 info = slgt_device_list;
1327 while( info ) {
1328 line_info(m, info);
1329 info = info->next_device;
1330 }
1331 return 0;
1332 }
1333
1334 static int synclink_gt_proc_open(struct inode *inode, struct file *file)
1335 {
1336 return single_open(file, synclink_gt_proc_show, NULL);
1337 }
1338
1339 static const struct file_operations synclink_gt_proc_fops = {
1340 .owner = THIS_MODULE,
1341 .open = synclink_gt_proc_open,
1342 .read = seq_read,
1343 .llseek = seq_lseek,
1344 .release = single_release,
1345 };
1346
1347 /*
1348 * return count of bytes in transmit buffer
1349 */
1350 static int chars_in_buffer(struct tty_struct *tty)
1351 {
1352 struct slgt_info *info = tty->driver_data;
1353 int count;
1354 if (sanity_check(info, tty->name, "chars_in_buffer"))
1355 return 0;
1356 count = tbuf_bytes(info);
1357 DBGINFO(("%s chars_in_buffer()=%d\n", info->device_name, count));
1358 return count;
1359 }
1360
1361 /*
1362 * signal remote device to throttle send data (our receive data)
1363 */
1364 static void throttle(struct tty_struct * tty)
1365 {
1366 struct slgt_info *info = tty->driver_data;
1367 unsigned long flags;
1368
1369 if (sanity_check(info, tty->name, "throttle"))
1370 return;
1371 DBGINFO(("%s throttle\n", info->device_name));
1372 if (I_IXOFF(tty))
1373 send_xchar(tty, STOP_CHAR(tty));
1374 if (tty->termios.c_cflag & CRTSCTS) {
1375 spin_lock_irqsave(&info->lock,flags);
1376 info->signals &= ~SerialSignal_RTS;
1377 set_signals(info);
1378 spin_unlock_irqrestore(&info->lock,flags);
1379 }
1380 }
1381
1382 /*
1383 * signal remote device to stop throttling send data (our receive data)
1384 */
1385 static void unthrottle(struct tty_struct * tty)
1386 {
1387 struct slgt_info *info = tty->driver_data;
1388 unsigned long flags;
1389
1390 if (sanity_check(info, tty->name, "unthrottle"))
1391 return;
1392 DBGINFO(("%s unthrottle\n", info->device_name));
1393 if (I_IXOFF(tty)) {
1394 if (info->x_char)
1395 info->x_char = 0;
1396 else
1397 send_xchar(tty, START_CHAR(tty));
1398 }
1399 if (tty->termios.c_cflag & CRTSCTS) {
1400 spin_lock_irqsave(&info->lock,flags);
1401 info->signals |= SerialSignal_RTS;
1402 set_signals(info);
1403 spin_unlock_irqrestore(&info->lock,flags);
1404 }
1405 }
1406
1407 /*
1408 * set or clear transmit break condition
1409 * break_state -1=set break condition, 0=clear
1410 */
1411 static int set_break(struct tty_struct *tty, int break_state)
1412 {
1413 struct slgt_info *info = tty->driver_data;
1414 unsigned short value;
1415 unsigned long flags;
1416
1417 if (sanity_check(info, tty->name, "set_break"))
1418 return -EINVAL;
1419 DBGINFO(("%s set_break(%d)\n", info->device_name, break_state));
1420
1421 spin_lock_irqsave(&info->lock,flags);
1422 value = rd_reg16(info, TCR);
1423 if (break_state == -1)
1424 value |= BIT6;
1425 else
1426 value &= ~BIT6;
1427 wr_reg16(info, TCR, value);
1428 spin_unlock_irqrestore(&info->lock,flags);
1429 return 0;
1430 }
1431
1432 #if SYNCLINK_GENERIC_HDLC
1433
1434 /**
1435 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1436 * set encoding and frame check sequence (FCS) options
1437 *
1438 * dev pointer to network device structure
1439 * encoding serial encoding setting
1440 * parity FCS setting
1441 *
1442 * returns 0 if success, otherwise error code
1443 */
1444 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1445 unsigned short parity)
1446 {
1447 struct slgt_info *info = dev_to_port(dev);
1448 unsigned char new_encoding;
1449 unsigned short new_crctype;
1450
1451 /* return error if TTY interface open */
1452 if (info->port.count)
1453 return -EBUSY;
1454
1455 DBGINFO(("%s hdlcdev_attach\n", info->device_name));
1456
1457 switch (encoding)
1458 {
1459 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
1460 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1461 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1462 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1463 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1464 default: return -EINVAL;
1465 }
1466
1467 switch (parity)
1468 {
1469 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
1470 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1471 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1472 default: return -EINVAL;
1473 }
1474
1475 info->params.encoding = new_encoding;
1476 info->params.crc_type = new_crctype;
1477
1478 /* if network interface up, reprogram hardware */
1479 if (info->netcount)
1480 program_hw(info);
1481
1482 return 0;
1483 }
1484
1485 /**
1486 * called by generic HDLC layer to send frame
1487 *
1488 * skb socket buffer containing HDLC frame
1489 * dev pointer to network device structure
1490 */
1491 static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
1492 struct net_device *dev)
1493 {
1494 struct slgt_info *info = dev_to_port(dev);
1495 unsigned long flags;
1496
1497 DBGINFO(("%s hdlc_xmit\n", dev->name));
1498
1499 if (!skb->len)
1500 return NETDEV_TX_OK;
1501
1502 /* stop sending until this frame completes */
1503 netif_stop_queue(dev);
1504
1505 /* update network statistics */
1506 dev->stats.tx_packets++;
1507 dev->stats.tx_bytes += skb->len;
1508
1509 /* save start time for transmit timeout detection */
1510 dev->trans_start = jiffies;
1511
1512 spin_lock_irqsave(&info->lock, flags);
1513 tx_load(info, skb->data, skb->len);
1514 spin_unlock_irqrestore(&info->lock, flags);
1515
1516 /* done with socket buffer, so free it */
1517 dev_kfree_skb(skb);
1518
1519 return NETDEV_TX_OK;
1520 }
1521
1522 /**
1523 * called by network layer when interface enabled
1524 * claim resources and initialize hardware
1525 *
1526 * dev pointer to network device structure
1527 *
1528 * returns 0 if success, otherwise error code
1529 */
1530 static int hdlcdev_open(struct net_device *dev)
1531 {
1532 struct slgt_info *info = dev_to_port(dev);
1533 int rc;
1534 unsigned long flags;
1535
1536 if (!try_module_get(THIS_MODULE))
1537 return -EBUSY;
1538
1539 DBGINFO(("%s hdlcdev_open\n", dev->name));
1540
1541 /* generic HDLC layer open processing */
1542 if ((rc = hdlc_open(dev)))
1543 return rc;
1544
1545 /* arbitrate between network and tty opens */
1546 spin_lock_irqsave(&info->netlock, flags);
1547 if (info->port.count != 0 || info->netcount != 0) {
1548 DBGINFO(("%s hdlc_open busy\n", dev->name));
1549 spin_unlock_irqrestore(&info->netlock, flags);
1550 return -EBUSY;
1551 }
1552 info->netcount=1;
1553 spin_unlock_irqrestore(&info->netlock, flags);
1554
1555 /* claim resources and init adapter */
1556 if ((rc = startup(info)) != 0) {
1557 spin_lock_irqsave(&info->netlock, flags);
1558 info->netcount=0;
1559 spin_unlock_irqrestore(&info->netlock, flags);
1560 return rc;
1561 }
1562
1563 /* assert RTS and DTR, apply hardware settings */
1564 info->signals |= SerialSignal_RTS | SerialSignal_DTR;
1565 program_hw(info);
1566
1567 /* enable network layer transmit */
1568 dev->trans_start = jiffies;
1569 netif_start_queue(dev);
1570
1571 /* inform generic HDLC layer of current DCD status */
1572 spin_lock_irqsave(&info->lock, flags);
1573 get_signals(info);
1574 spin_unlock_irqrestore(&info->lock, flags);
1575 if (info->signals & SerialSignal_DCD)
1576 netif_carrier_on(dev);
1577 else
1578 netif_carrier_off(dev);
1579 return 0;
1580 }
1581
1582 /**
1583 * called by network layer when interface is disabled
1584 * shutdown hardware and release resources
1585 *
1586 * dev pointer to network device structure
1587 *
1588 * returns 0 if success, otherwise error code
1589 */
1590 static int hdlcdev_close(struct net_device *dev)
1591 {
1592 struct slgt_info *info = dev_to_port(dev);
1593 unsigned long flags;
1594
1595 DBGINFO(("%s hdlcdev_close\n", dev->name));
1596
1597 netif_stop_queue(dev);
1598
1599 /* shutdown adapter and release resources */
1600 shutdown(info);
1601
1602 hdlc_close(dev);
1603
1604 spin_lock_irqsave(&info->netlock, flags);
1605 info->netcount=0;
1606 spin_unlock_irqrestore(&info->netlock, flags);
1607
1608 module_put(THIS_MODULE);
1609 return 0;
1610 }
1611
1612 /**
1613 * called by network layer to process IOCTL call to network device
1614 *
1615 * dev pointer to network device structure
1616 * ifr pointer to network interface request structure
1617 * cmd IOCTL command code
1618 *
1619 * returns 0 if success, otherwise error code
1620 */
1621 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1622 {
1623 const size_t size = sizeof(sync_serial_settings);
1624 sync_serial_settings new_line;
1625 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1626 struct slgt_info *info = dev_to_port(dev);
1627 unsigned int flags;
1628
1629 DBGINFO(("%s hdlcdev_ioctl\n", dev->name));
1630
1631 /* return error if TTY interface open */
1632 if (info->port.count)
1633 return -EBUSY;
1634
1635 if (cmd != SIOCWANDEV)
1636 return hdlc_ioctl(dev, ifr, cmd);
1637
1638 memset(&new_line, 0, sizeof(new_line));
1639
1640 switch(ifr->ifr_settings.type) {
1641 case IF_GET_IFACE: /* return current sync_serial_settings */
1642
1643 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1644 if (ifr->ifr_settings.size < size) {
1645 ifr->ifr_settings.size = size; /* data size wanted */
1646 return -ENOBUFS;
1647 }
1648
1649 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1650 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1651 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1652 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1653
1654 switch (flags){
1655 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1656 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
1657 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
1658 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1659 default: new_line.clock_type = CLOCK_DEFAULT;
1660 }
1661
1662 new_line.clock_rate = info->params.clock_speed;
1663 new_line.loopback = info->params.loopback ? 1:0;
1664
1665 if (copy_to_user(line, &new_line, size))
1666 return -EFAULT;
1667 return 0;
1668
1669 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1670
1671 if(!capable(CAP_NET_ADMIN))
1672 return -EPERM;
1673 if (copy_from_user(&new_line, line, size))
1674 return -EFAULT;
1675
1676 switch (new_line.clock_type)
1677 {
1678 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1679 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1680 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
1681 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
1682 case CLOCK_DEFAULT: flags = info->params.flags &
1683 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1684 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1685 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1686 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
1687 default: return -EINVAL;
1688 }
1689
1690 if (new_line.loopback != 0 && new_line.loopback != 1)
1691 return -EINVAL;
1692
1693 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1694 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1695 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1696 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1697 info->params.flags |= flags;
1698
1699 info->params.loopback = new_line.loopback;
1700
1701 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1702 info->params.clock_speed = new_line.clock_rate;
1703 else
1704 info->params.clock_speed = 0;
1705
1706 /* if network interface up, reprogram hardware */
1707 if (info->netcount)
1708 program_hw(info);
1709 return 0;
1710
1711 default:
1712 return hdlc_ioctl(dev, ifr, cmd);
1713 }
1714 }
1715
1716 /**
1717 * called by network layer when transmit timeout is detected
1718 *
1719 * dev pointer to network device structure
1720 */
1721 static void hdlcdev_tx_timeout(struct net_device *dev)
1722 {
1723 struct slgt_info *info = dev_to_port(dev);
1724 unsigned long flags;
1725
1726 DBGINFO(("%s hdlcdev_tx_timeout\n", dev->name));
1727
1728 dev->stats.tx_errors++;
1729 dev->stats.tx_aborted_errors++;
1730
1731 spin_lock_irqsave(&info->lock,flags);
1732 tx_stop(info);
1733 spin_unlock_irqrestore(&info->lock,flags);
1734
1735 netif_wake_queue(dev);
1736 }
1737
1738 /**
1739 * called by device driver when transmit completes
1740 * reenable network layer transmit if stopped
1741 *
1742 * info pointer to device instance information
1743 */
1744 static void hdlcdev_tx_done(struct slgt_info *info)
1745 {
1746 if (netif_queue_stopped(info->netdev))
1747 netif_wake_queue(info->netdev);
1748 }
1749
1750 /**
1751 * called by device driver when frame received
1752 * pass frame to network layer
1753 *
1754 * info pointer to device instance information
1755 * buf pointer to buffer contianing frame data
1756 * size count of data bytes in buf
1757 */
1758 static void hdlcdev_rx(struct slgt_info *info, char *buf, int size)
1759 {
1760 struct sk_buff *skb = dev_alloc_skb(size);
1761 struct net_device *dev = info->netdev;
1762
1763 DBGINFO(("%s hdlcdev_rx\n", dev->name));
1764
1765 if (skb == NULL) {
1766 DBGERR(("%s: can't alloc skb, drop packet\n", dev->name));
1767 dev->stats.rx_dropped++;
1768 return;
1769 }
1770
1771 memcpy(skb_put(skb, size), buf, size);
1772
1773 skb->protocol = hdlc_type_trans(skb, dev);
1774
1775 dev->stats.rx_packets++;
1776 dev->stats.rx_bytes += size;
1777
1778 netif_rx(skb);
1779 }
1780
1781 static const struct net_device_ops hdlcdev_ops = {
1782 .ndo_open = hdlcdev_open,
1783 .ndo_stop = hdlcdev_close,
1784 .ndo_change_mtu = hdlc_change_mtu,
1785 .ndo_start_xmit = hdlc_start_xmit,
1786 .ndo_do_ioctl = hdlcdev_ioctl,
1787 .ndo_tx_timeout = hdlcdev_tx_timeout,
1788 };
1789
1790 /**
1791 * called by device driver when adding device instance
1792 * do generic HDLC initialization
1793 *
1794 * info pointer to device instance information
1795 *
1796 * returns 0 if success, otherwise error code
1797 */
1798 static int hdlcdev_init(struct slgt_info *info)
1799 {
1800 int rc;
1801 struct net_device *dev;
1802 hdlc_device *hdlc;
1803
1804 /* allocate and initialize network and HDLC layer objects */
1805
1806 if (!(dev = alloc_hdlcdev(info))) {
1807 printk(KERN_ERR "%s hdlc device alloc failure\n", info->device_name);
1808 return -ENOMEM;
1809 }
1810
1811 /* for network layer reporting purposes only */
1812 dev->mem_start = info->phys_reg_addr;
1813 dev->mem_end = info->phys_reg_addr + SLGT_REG_SIZE - 1;
1814 dev->irq = info->irq_level;
1815
1816 /* network layer callbacks and settings */
1817 dev->netdev_ops = &hdlcdev_ops;
1818 dev->watchdog_timeo = 10 * HZ;
1819 dev->tx_queue_len = 50;
1820
1821 /* generic HDLC layer callbacks and settings */
1822 hdlc = dev_to_hdlc(dev);
1823 hdlc->attach = hdlcdev_attach;
1824 hdlc->xmit = hdlcdev_xmit;
1825
1826 /* register objects with HDLC layer */
1827 if ((rc = register_hdlc_device(dev))) {
1828 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1829 free_netdev(dev);
1830 return rc;
1831 }
1832
1833 info->netdev = dev;
1834 return 0;
1835 }
1836
1837 /**
1838 * called by device driver when removing device instance
1839 * do generic HDLC cleanup
1840 *
1841 * info pointer to device instance information
1842 */
1843 static void hdlcdev_exit(struct slgt_info *info)
1844 {
1845 unregister_hdlc_device(info->netdev);
1846 free_netdev(info->netdev);
1847 info->netdev = NULL;
1848 }
1849
1850 #endif /* ifdef CONFIG_HDLC */
1851
1852 /*
1853 * get async data from rx DMA buffers
1854 */
1855 static void rx_async(struct slgt_info *info)
1856 {
1857 struct mgsl_icount *icount = &info->icount;
1858 unsigned int start, end;
1859 unsigned char *p;
1860 unsigned char status;
1861 struct slgt_desc *bufs = info->rbufs;
1862 int i, count;
1863 int chars = 0;
1864 int stat;
1865 unsigned char ch;
1866
1867 start = end = info->rbuf_current;
1868
1869 while(desc_complete(bufs[end])) {
1870 count = desc_count(bufs[end]) - info->rbuf_index;
1871 p = bufs[end].buf + info->rbuf_index;
1872
1873 DBGISR(("%s rx_async count=%d\n", info->device_name, count));
1874 DBGDATA(info, p, count, "rx");
1875
1876 for(i=0 ; i < count; i+=2, p+=2) {
1877 ch = *p;
1878 icount->rx++;
1879
1880 stat = 0;
1881
1882 if ((status = *(p+1) & (BIT1 + BIT0))) {
1883 if (status & BIT1)
1884 icount->parity++;
1885 else if (status & BIT0)
1886 icount->frame++;
1887 /* discard char if tty control flags say so */
1888 if (status & info->ignore_status_mask)
1889 continue;
1890 if (status & BIT1)
1891 stat = TTY_PARITY;
1892 else if (status & BIT0)
1893 stat = TTY_FRAME;
1894 }
1895 tty_insert_flip_char(&info->port, ch, stat);
1896 chars++;
1897 }
1898
1899 if (i < count) {
1900 /* receive buffer not completed */
1901 info->rbuf_index += i;
1902 mod_timer(&info->rx_timer, jiffies + 1);
1903 break;
1904 }
1905
1906 info->rbuf_index = 0;
1907 free_rbufs(info, end, end);
1908
1909 if (++end == info->rbuf_count)
1910 end = 0;
1911
1912 /* if entire list searched then no frame available */
1913 if (end == start)
1914 break;
1915 }
1916
1917 if (chars)
1918 tty_flip_buffer_push(&info->port);
1919 }
1920
1921 /*
1922 * return next bottom half action to perform
1923 */
1924 static int bh_action(struct slgt_info *info)
1925 {
1926 unsigned long flags;
1927 int rc;
1928
1929 spin_lock_irqsave(&info->lock,flags);
1930
1931 if (info->pending_bh & BH_RECEIVE) {
1932 info->pending_bh &= ~BH_RECEIVE;
1933 rc = BH_RECEIVE;
1934 } else if (info->pending_bh & BH_TRANSMIT) {
1935 info->pending_bh &= ~BH_TRANSMIT;
1936 rc = BH_TRANSMIT;
1937 } else if (info->pending_bh & BH_STATUS) {
1938 info->pending_bh &= ~BH_STATUS;
1939 rc = BH_STATUS;
1940 } else {
1941 /* Mark BH routine as complete */
1942 info->bh_running = false;
1943 info->bh_requested = false;
1944 rc = 0;
1945 }
1946
1947 spin_unlock_irqrestore(&info->lock,flags);
1948
1949 return rc;
1950 }
1951
1952 /*
1953 * perform bottom half processing
1954 */
1955 static void bh_handler(struct work_struct *work)
1956 {
1957 struct slgt_info *info = container_of(work, struct slgt_info, task);
1958 int action;
1959
1960 info->bh_running = true;
1961
1962 while((action = bh_action(info))) {
1963 switch (action) {
1964 case BH_RECEIVE:
1965 DBGBH(("%s bh receive\n", info->device_name));
1966 switch(info->params.mode) {
1967 case MGSL_MODE_ASYNC:
1968 rx_async(info);
1969 break;
1970 case MGSL_MODE_HDLC:
1971 while(rx_get_frame(info));
1972 break;
1973 case MGSL_MODE_RAW:
1974 case MGSL_MODE_MONOSYNC:
1975 case MGSL_MODE_BISYNC:
1976 case MGSL_MODE_XSYNC:
1977 while(rx_get_buf(info));
1978 break;
1979 }
1980 /* restart receiver if rx DMA buffers exhausted */
1981 if (info->rx_restart)
1982 rx_start(info);
1983 break;
1984 case BH_TRANSMIT:
1985 bh_transmit(info);
1986 break;
1987 case BH_STATUS:
1988 DBGBH(("%s bh status\n", info->device_name));
1989 info->ri_chkcount = 0;
1990 info->dsr_chkcount = 0;
1991 info->dcd_chkcount = 0;
1992 info->cts_chkcount = 0;
1993 break;
1994 default:
1995 DBGBH(("%s unknown action\n", info->device_name));
1996 break;
1997 }
1998 }
1999 DBGBH(("%s bh_handler exit\n", info->device_name));
2000 }
2001
2002 static void bh_transmit(struct slgt_info *info)
2003 {
2004 struct tty_struct *tty = info->port.tty;
2005
2006 DBGBH(("%s bh_transmit\n", info->device_name));
2007 if (tty)
2008 tty_wakeup(tty);
2009 }
2010
2011 static void dsr_change(struct slgt_info *info, unsigned short status)
2012 {
2013 if (status & BIT3) {
2014 info->signals |= SerialSignal_DSR;
2015 info->input_signal_events.dsr_up++;
2016 } else {
2017 info->signals &= ~SerialSignal_DSR;
2018 info->input_signal_events.dsr_down++;
2019 }
2020 DBGISR(("dsr_change %s signals=%04X\n", info->device_name, info->signals));
2021 if ((info->dsr_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2022 slgt_irq_off(info, IRQ_DSR);
2023 return;
2024 }
2025 info->icount.dsr++;
2026 wake_up_interruptible(&info->status_event_wait_q);
2027 wake_up_interruptible(&info->event_wait_q);
2028 info->pending_bh |= BH_STATUS;
2029 }
2030
2031 static void cts_change(struct slgt_info *info, unsigned short status)
2032 {
2033 if (status & BIT2) {
2034 info->signals |= SerialSignal_CTS;
2035 info->input_signal_events.cts_up++;
2036 } else {
2037 info->signals &= ~SerialSignal_CTS;
2038 info->input_signal_events.cts_down++;
2039 }
2040 DBGISR(("cts_change %s signals=%04X\n", info->device_name, info->signals));
2041 if ((info->cts_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2042 slgt_irq_off(info, IRQ_CTS);
2043 return;
2044 }
2045 info->icount.cts++;
2046 wake_up_interruptible(&info->status_event_wait_q);
2047 wake_up_interruptible(&info->event_wait_q);
2048 info->pending_bh |= BH_STATUS;
2049
2050 if (tty_port_cts_enabled(&info->port)) {
2051 if (info->port.tty) {
2052 if (info->port.tty->hw_stopped) {
2053 if (info->signals & SerialSignal_CTS) {
2054 info->port.tty->hw_stopped = 0;
2055 info->pending_bh |= BH_TRANSMIT;
2056 return;
2057 }
2058 } else {
2059 if (!(info->signals & SerialSignal_CTS))
2060 info->port.tty->hw_stopped = 1;
2061 }
2062 }
2063 }
2064 }
2065
2066 static void dcd_change(struct slgt_info *info, unsigned short status)
2067 {
2068 if (status & BIT1) {
2069 info->signals |= SerialSignal_DCD;
2070 info->input_signal_events.dcd_up++;
2071 } else {
2072 info->signals &= ~SerialSignal_DCD;
2073 info->input_signal_events.dcd_down++;
2074 }
2075 DBGISR(("dcd_change %s signals=%04X\n", info->device_name, info->signals));
2076 if ((info->dcd_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2077 slgt_irq_off(info, IRQ_DCD);
2078 return;
2079 }
2080 info->icount.dcd++;
2081 #if SYNCLINK_GENERIC_HDLC
2082 if (info->netcount) {
2083 if (info->signals & SerialSignal_DCD)
2084 netif_carrier_on(info->netdev);
2085 else
2086 netif_carrier_off(info->netdev);
2087 }
2088 #endif
2089 wake_up_interruptible(&info->status_event_wait_q);
2090 wake_up_interruptible(&info->event_wait_q);
2091 info->pending_bh |= BH_STATUS;
2092
2093 if (info->port.flags & ASYNC_CHECK_CD) {
2094 if (info->signals & SerialSignal_DCD)
2095 wake_up_interruptible(&info->port.open_wait);
2096 else {
2097 if (info->port.tty)
2098 tty_hangup(info->port.tty);
2099 }
2100 }
2101 }
2102
2103 static void ri_change(struct slgt_info *info, unsigned short status)
2104 {
2105 if (status & BIT0) {
2106 info->signals |= SerialSignal_RI;
2107 info->input_signal_events.ri_up++;
2108 } else {
2109 info->signals &= ~SerialSignal_RI;
2110 info->input_signal_events.ri_down++;
2111 }
2112 DBGISR(("ri_change %s signals=%04X\n", info->device_name, info->signals));
2113 if ((info->ri_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2114 slgt_irq_off(info, IRQ_RI);
2115 return;
2116 }
2117 info->icount.rng++;
2118 wake_up_interruptible(&info->status_event_wait_q);
2119 wake_up_interruptible(&info->event_wait_q);
2120 info->pending_bh |= BH_STATUS;
2121 }
2122
2123 static void isr_rxdata(struct slgt_info *info)
2124 {
2125 unsigned int count = info->rbuf_fill_count;
2126 unsigned int i = info->rbuf_fill_index;
2127 unsigned short reg;
2128
2129 while (rd_reg16(info, SSR) & IRQ_RXDATA) {
2130 reg = rd_reg16(info, RDR);
2131 DBGISR(("isr_rxdata %s RDR=%04X\n", info->device_name, reg));
2132 if (desc_complete(info->rbufs[i])) {
2133 /* all buffers full */
2134 rx_stop(info);
2135 info->rx_restart = 1;
2136 continue;
2137 }
2138 info->rbufs[i].buf[count++] = (unsigned char)reg;
2139 /* async mode saves status byte to buffer for each data byte */
2140 if (info->params.mode == MGSL_MODE_ASYNC)
2141 info->rbufs[i].buf[count++] = (unsigned char)(reg >> 8);
2142 if (count == info->rbuf_fill_level || (reg & BIT10)) {
2143 /* buffer full or end of frame */
2144 set_desc_count(info->rbufs[i], count);
2145 set_desc_status(info->rbufs[i], BIT15 | (reg >> 8));
2146 info->rbuf_fill_count = count = 0;
2147 if (++i == info->rbuf_count)
2148 i = 0;
2149 info->pending_bh |= BH_RECEIVE;
2150 }
2151 }
2152
2153 info->rbuf_fill_index = i;
2154 info->rbuf_fill_count = count;
2155 }
2156
2157 static void isr_serial(struct slgt_info *info)
2158 {
2159 unsigned short status = rd_reg16(info, SSR);
2160
2161 DBGISR(("%s isr_serial status=%04X\n", info->device_name, status));
2162
2163 wr_reg16(info, SSR, status); /* clear pending */
2164
2165 info->irq_occurred = true;
2166
2167 if (info->params.mode == MGSL_MODE_ASYNC) {
2168 if (status & IRQ_TXIDLE) {
2169 if (info->tx_active)
2170 isr_txeom(info, status);
2171 }
2172 if (info->rx_pio && (status & IRQ_RXDATA))
2173 isr_rxdata(info);
2174 if ((status & IRQ_RXBREAK) && (status & RXBREAK)) {
2175 info->icount.brk++;
2176 /* process break detection if tty control allows */
2177 if (info->port.tty) {
2178 if (!(status & info->ignore_status_mask)) {
2179 if (info->read_status_mask & MASK_BREAK) {
2180 tty_insert_flip_char(&info->port, 0, TTY_BREAK);
2181 if (info->port.flags & ASYNC_SAK)
2182 do_SAK(info->port.tty);
2183 }
2184 }
2185 }
2186 }
2187 } else {
2188 if (status & (IRQ_TXIDLE + IRQ_TXUNDER))
2189 isr_txeom(info, status);
2190 if (info->rx_pio && (status & IRQ_RXDATA))
2191 isr_rxdata(info);
2192 if (status & IRQ_RXIDLE) {
2193 if (status & RXIDLE)
2194 info->icount.rxidle++;
2195 else
2196 info->icount.exithunt++;
2197 wake_up_interruptible(&info->event_wait_q);
2198 }
2199
2200 if (status & IRQ_RXOVER)
2201 rx_start(info);
2202 }
2203
2204 if (status & IRQ_DSR)
2205 dsr_change(info, status);
2206 if (status & IRQ_CTS)
2207 cts_change(info, status);
2208 if (status & IRQ_DCD)
2209 dcd_change(info, status);
2210 if (status & IRQ_RI)
2211 ri_change(info, status);
2212 }
2213
2214 static void isr_rdma(struct slgt_info *info)
2215 {
2216 unsigned int status = rd_reg32(info, RDCSR);
2217
2218 DBGISR(("%s isr_rdma status=%08x\n", info->device_name, status));
2219
2220 /* RDCSR (rx DMA control/status)
2221 *
2222 * 31..07 reserved
2223 * 06 save status byte to DMA buffer
2224 * 05 error
2225 * 04 eol (end of list)
2226 * 03 eob (end of buffer)
2227 * 02 IRQ enable
2228 * 01 reset
2229 * 00 enable
2230 */
2231 wr_reg32(info, RDCSR, status); /* clear pending */
2232
2233 if (status & (BIT5 + BIT4)) {
2234 DBGISR(("%s isr_rdma rx_restart=1\n", info->device_name));
2235 info->rx_restart = true;
2236 }
2237 info->pending_bh |= BH_RECEIVE;
2238 }
2239
2240 static void isr_tdma(struct slgt_info *info)
2241 {
2242 unsigned int status = rd_reg32(info, TDCSR);
2243
2244 DBGISR(("%s isr_tdma status=%08x\n", info->device_name, status));
2245
2246 /* TDCSR (tx DMA control/status)
2247 *
2248 * 31..06 reserved
2249 * 05 error
2250 * 04 eol (end of list)
2251 * 03 eob (end of buffer)
2252 * 02 IRQ enable
2253 * 01 reset
2254 * 00 enable
2255 */
2256 wr_reg32(info, TDCSR, status); /* clear pending */
2257
2258 if (status & (BIT5 + BIT4 + BIT3)) {
2259 // another transmit buffer has completed
2260 // run bottom half to get more send data from user
2261 info->pending_bh |= BH_TRANSMIT;
2262 }
2263 }
2264
2265 /*
2266 * return true if there are unsent tx DMA buffers, otherwise false
2267 *
2268 * if there are unsent buffers then info->tbuf_start
2269 * is set to index of first unsent buffer
2270 */
2271 static bool unsent_tbufs(struct slgt_info *info)
2272 {
2273 unsigned int i = info->tbuf_current;
2274 bool rc = false;
2275
2276 /*
2277 * search backwards from last loaded buffer (precedes tbuf_current)
2278 * for first unsent buffer (desc_count > 0)
2279 */
2280
2281 do {
2282 if (i)
2283 i--;
2284 else
2285 i = info->tbuf_count - 1;
2286 if (!desc_count(info->tbufs[i]))
2287 break;
2288 info->tbuf_start = i;
2289 rc = true;
2290 } while (i != info->tbuf_current);
2291
2292 return rc;
2293 }
2294
2295 static void isr_txeom(struct slgt_info *info, unsigned short status)
2296 {
2297 DBGISR(("%s txeom status=%04x\n", info->device_name, status));
2298
2299 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
2300 tdma_reset(info);
2301 if (status & IRQ_TXUNDER) {
2302 unsigned short val = rd_reg16(info, TCR);
2303 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
2304 wr_reg16(info, TCR, val); /* clear reset bit */
2305 }
2306
2307 if (info->tx_active) {
2308 if (info->params.mode != MGSL_MODE_ASYNC) {
2309 if (status & IRQ_TXUNDER)
2310 info->icount.txunder++;
2311 else if (status & IRQ_TXIDLE)
2312 info->icount.txok++;
2313 }
2314
2315 if (unsent_tbufs(info)) {
2316 tx_start(info);
2317 update_tx_timer(info);
2318 return;
2319 }
2320 info->tx_active = false;
2321
2322 del_timer(&info->tx_timer);
2323
2324 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done) {
2325 info->signals &= ~SerialSignal_RTS;
2326 info->drop_rts_on_tx_done = false;
2327 set_signals(info);
2328 }
2329
2330 #if SYNCLINK_GENERIC_HDLC
2331 if (info->netcount)
2332 hdlcdev_tx_done(info);
2333 else
2334 #endif
2335 {
2336 if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2337 tx_stop(info);
2338 return;
2339 }
2340 info->pending_bh |= BH_TRANSMIT;
2341 }
2342 }
2343 }
2344
2345 static void isr_gpio(struct slgt_info *info, unsigned int changed, unsigned int state)
2346 {
2347 struct cond_wait *w, *prev;
2348
2349 /* wake processes waiting for specific transitions */
2350 for (w = info->gpio_wait_q, prev = NULL ; w != NULL ; w = w->next) {
2351 if (w->data & changed) {
2352 w->data = state;
2353 wake_up_interruptible(&w->q);
2354 if (prev != NULL)
2355 prev->next = w->next;
2356 else
2357 info->gpio_wait_q = w->next;
2358 } else
2359 prev = w;
2360 }
2361 }
2362
2363 /* interrupt service routine
2364 *
2365 * irq interrupt number
2366 * dev_id device ID supplied during interrupt registration
2367 */
2368 static irqreturn_t slgt_interrupt(int dummy, void *dev_id)
2369 {
2370 struct slgt_info *info = dev_id;
2371 unsigned int gsr;
2372 unsigned int i;
2373
2374 DBGISR(("slgt_interrupt irq=%d entry\n", info->irq_level));
2375
2376 while((gsr = rd_reg32(info, GSR) & 0xffffff00)) {
2377 DBGISR(("%s gsr=%08x\n", info->device_name, gsr));
2378 info->irq_occurred = true;
2379 for(i=0; i < info->port_count ; i++) {
2380 if (info->port_array[i] == NULL)
2381 continue;
2382 spin_lock(&info->port_array[i]->lock);
2383 if (gsr & (BIT8 << i))
2384 isr_serial(info->port_array[i]);
2385 if (gsr & (BIT16 << (i*2)))
2386 isr_rdma(info->port_array[i]);
2387 if (gsr & (BIT17 << (i*2)))
2388 isr_tdma(info->port_array[i]);
2389 spin_unlock(&info->port_array[i]->lock);
2390 }
2391 }
2392
2393 if (info->gpio_present) {
2394 unsigned int state;
2395 unsigned int changed;
2396 spin_lock(&info->lock);
2397 while ((changed = rd_reg32(info, IOSR)) != 0) {
2398 DBGISR(("%s iosr=%08x\n", info->device_name, changed));
2399 /* read latched state of GPIO signals */
2400 state = rd_reg32(info, IOVR);
2401 /* clear pending GPIO interrupt bits */
2402 wr_reg32(info, IOSR, changed);
2403 for (i=0 ; i < info->port_count ; i++) {
2404 if (info->port_array[i] != NULL)
2405 isr_gpio(info->port_array[i], changed, state);
2406 }
2407 }
2408 spin_unlock(&info->lock);
2409 }
2410
2411 for(i=0; i < info->port_count ; i++) {
2412 struct slgt_info *port = info->port_array[i];
2413 if (port == NULL)
2414 continue;
2415 spin_lock(&port->lock);
2416 if ((port->port.count || port->netcount) &&
2417 port->pending_bh && !port->bh_running &&
2418 !port->bh_requested) {
2419 DBGISR(("%s bh queued\n", port->device_name));
2420 schedule_work(&port->task);
2421 port->bh_requested = true;
2422 }
2423 spin_unlock(&port->lock);
2424 }
2425
2426 DBGISR(("slgt_interrupt irq=%d exit\n", info->irq_level));
2427 return IRQ_HANDLED;
2428 }
2429
2430 static int startup(struct slgt_info *info)
2431 {
2432 DBGINFO(("%s startup\n", info->device_name));
2433
2434 if (info->port.flags & ASYNC_INITIALIZED)
2435 return 0;
2436
2437 if (!info->tx_buf) {
2438 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2439 if (!info->tx_buf) {
2440 DBGERR(("%s can't allocate tx buffer\n", info->device_name));
2441 return -ENOMEM;
2442 }
2443 }
2444
2445 info->pending_bh = 0;
2446
2447 memset(&info->icount, 0, sizeof(info->icount));
2448
2449 /* program hardware for current parameters */
2450 change_params(info);
2451
2452 if (info->port.tty)
2453 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2454
2455 info->port.flags |= ASYNC_INITIALIZED;
2456
2457 return 0;
2458 }
2459
2460 /*
2461 * called by close() and hangup() to shutdown hardware
2462 */
2463 static void shutdown(struct slgt_info *info)
2464 {
2465 unsigned long flags;
2466
2467 if (!(info->port.flags & ASYNC_INITIALIZED))
2468 return;
2469
2470 DBGINFO(("%s shutdown\n", info->device_name));
2471
2472 /* clear status wait queue because status changes */
2473 /* can't happen after shutting down the hardware */
2474 wake_up_interruptible(&info->status_event_wait_q);
2475 wake_up_interruptible(&info->event_wait_q);
2476
2477 del_timer_sync(&info->tx_timer);
2478 del_timer_sync(&info->rx_timer);
2479
2480 kfree(info->tx_buf);
2481 info->tx_buf = NULL;
2482
2483 spin_lock_irqsave(&info->lock,flags);
2484
2485 tx_stop(info);
2486 rx_stop(info);
2487
2488 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
2489
2490 if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) {
2491 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2492 set_signals(info);
2493 }
2494
2495 flush_cond_wait(&info->gpio_wait_q);
2496
2497 spin_unlock_irqrestore(&info->lock,flags);
2498
2499 if (info->port.tty)
2500 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2501
2502 info->port.flags &= ~ASYNC_INITIALIZED;
2503 }
2504
2505 static void program_hw(struct slgt_info *info)
2506 {
2507 unsigned long flags;
2508
2509 spin_lock_irqsave(&info->lock,flags);
2510
2511 rx_stop(info);
2512 tx_stop(info);
2513
2514 if (info->params.mode != MGSL_MODE_ASYNC ||
2515 info->netcount)
2516 sync_mode(info);
2517 else
2518 async_mode(info);
2519
2520 set_signals(info);
2521
2522 info->dcd_chkcount = 0;
2523 info->cts_chkcount = 0;
2524 info->ri_chkcount = 0;
2525 info->dsr_chkcount = 0;
2526
2527 slgt_irq_on(info, IRQ_DCD | IRQ_CTS | IRQ_DSR | IRQ_RI);
2528 get_signals(info);
2529
2530 if (info->netcount ||
2531 (info->port.tty && info->port.tty->termios.c_cflag & CREAD))
2532 rx_start(info);
2533
2534 spin_unlock_irqrestore(&info->lock,flags);
2535 }
2536
2537 /*
2538 * reconfigure adapter based on new parameters
2539 */
2540 static void change_params(struct slgt_info *info)
2541 {
2542 unsigned cflag;
2543 int bits_per_char;
2544
2545 if (!info->port.tty)
2546 return;
2547 DBGINFO(("%s change_params\n", info->device_name));
2548
2549 cflag = info->port.tty->termios.c_cflag;
2550
2551 /* if B0 rate (hangup) specified then negate RTS and DTR */
2552 /* otherwise assert RTS and DTR */
2553 if (cflag & CBAUD)
2554 info->signals |= SerialSignal_RTS | SerialSignal_DTR;
2555 else
2556 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2557
2558 /* byte size and parity */
2559
2560 switch (cflag & CSIZE) {
2561 case CS5: info->params.data_bits = 5; break;
2562 case CS6: info->params.data_bits = 6; break;
2563 case CS7: info->params.data_bits = 7; break;
2564 case CS8: info->params.data_bits = 8; break;
2565 default: info->params.data_bits = 7; break;
2566 }
2567
2568 info->params.stop_bits = (cflag & CSTOPB) ? 2 : 1;
2569
2570 if (cflag & PARENB)
2571 info->params.parity = (cflag & PARODD) ? ASYNC_PARITY_ODD : ASYNC_PARITY_EVEN;
2572 else
2573 info->params.parity = ASYNC_PARITY_NONE;
2574
2575 /* calculate number of jiffies to transmit a full
2576 * FIFO (32 bytes) at specified data rate
2577 */
2578 bits_per_char = info->params.data_bits +
2579 info->params.stop_bits + 1;
2580
2581 info->params.data_rate = tty_get_baud_rate(info->port.tty);
2582
2583 if (info->params.data_rate) {
2584 info->timeout = (32*HZ*bits_per_char) /
2585 info->params.data_rate;
2586 }
2587 info->timeout += HZ/50; /* Add .02 seconds of slop */
2588
2589 if (cflag & CRTSCTS)
2590 info->port.flags |= ASYNC_CTS_FLOW;
2591 else
2592 info->port.flags &= ~ASYNC_CTS_FLOW;
2593
2594 if (cflag & CLOCAL)
2595 info->port.flags &= ~ASYNC_CHECK_CD;
2596 else
2597 info->port.flags |= ASYNC_CHECK_CD;
2598
2599 /* process tty input control flags */
2600
2601 info->read_status_mask = IRQ_RXOVER;
2602 if (I_INPCK(info->port.tty))
2603 info->read_status_mask |= MASK_PARITY | MASK_FRAMING;
2604 if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
2605 info->read_status_mask |= MASK_BREAK;
2606 if (I_IGNPAR(info->port.tty))
2607 info->ignore_status_mask |= MASK_PARITY | MASK_FRAMING;
2608 if (I_IGNBRK(info->port.tty)) {
2609 info->ignore_status_mask |= MASK_BREAK;
2610 /* If ignoring parity and break indicators, ignore
2611 * overruns too. (For real raw support).
2612 */
2613 if (I_IGNPAR(info->port.tty))
2614 info->ignore_status_mask |= MASK_OVERRUN;
2615 }
2616
2617 program_hw(info);
2618 }
2619
2620 static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount)
2621 {
2622 DBGINFO(("%s get_stats\n", info->device_name));
2623 if (!user_icount) {
2624 memset(&info->icount, 0, sizeof(info->icount));
2625 } else {
2626 if (copy_to_user(user_icount, &info->icount, sizeof(struct mgsl_icount)))
2627 return -EFAULT;
2628 }
2629 return 0;
2630 }
2631
2632 static int get_params(struct slgt_info *info, MGSL_PARAMS __user *user_params)
2633 {
2634 DBGINFO(("%s get_params\n", info->device_name));
2635 if (copy_to_user(user_params, &info->params, sizeof(MGSL_PARAMS)))
2636 return -EFAULT;
2637 return 0;
2638 }
2639
2640 static int set_params(struct slgt_info *info, MGSL_PARAMS __user *new_params)
2641 {
2642 unsigned long flags;
2643 MGSL_PARAMS tmp_params;
2644
2645 DBGINFO(("%s set_params\n", info->device_name));
2646 if (copy_from_user(&tmp_params, new_params, sizeof(MGSL_PARAMS)))
2647 return -EFAULT;
2648
2649 spin_lock_irqsave(&info->lock, flags);
2650 if (tmp_params.mode == MGSL_MODE_BASE_CLOCK)
2651 info->base_clock = tmp_params.clock_speed;
2652 else
2653 memcpy(&info->params, &tmp_params, sizeof(MGSL_PARAMS));
2654 spin_unlock_irqrestore(&info->lock, flags);
2655
2656 program_hw(info);
2657
2658 return 0;
2659 }
2660
2661 static int get_txidle(struct slgt_info *info, int __user *idle_mode)
2662 {
2663 DBGINFO(("%s get_txidle=%d\n", info->device_name, info->idle_mode));
2664 if (put_user(info->idle_mode, idle_mode))
2665 return -EFAULT;
2666 return 0;
2667 }
2668
2669 static int set_txidle(struct slgt_info *info, int idle_mode)
2670 {
2671 unsigned long flags;
2672 DBGINFO(("%s set_txidle(%d)\n", info->device_name, idle_mode));
2673 spin_lock_irqsave(&info->lock,flags);
2674 info->idle_mode = idle_mode;
2675 if (info->params.mode != MGSL_MODE_ASYNC)
2676 tx_set_idle(info);
2677 spin_unlock_irqrestore(&info->lock,flags);
2678 return 0;
2679 }
2680
2681 static int tx_enable(struct slgt_info *info, int enable)
2682 {
2683 unsigned long flags;
2684 DBGINFO(("%s tx_enable(%d)\n", info->device_name, enable));
2685 spin_lock_irqsave(&info->lock,flags);
2686 if (enable) {
2687 if (!info->tx_enabled)
2688 tx_start(info);
2689 } else {
2690 if (info->tx_enabled)
2691 tx_stop(info);
2692 }
2693 spin_unlock_irqrestore(&info->lock,flags);
2694 return 0;
2695 }
2696
2697 /*
2698 * abort transmit HDLC frame
2699 */
2700 static int tx_abort(struct slgt_info *info)
2701 {
2702 unsigned long flags;
2703 DBGINFO(("%s tx_abort\n", info->device_name));
2704 spin_lock_irqsave(&info->lock,flags);
2705 tdma_reset(info);
2706 spin_unlock_irqrestore(&info->lock,flags);
2707 return 0;
2708 }
2709
2710 static int rx_enable(struct slgt_info *info, int enable)
2711 {
2712 unsigned long flags;
2713 unsigned int rbuf_fill_level;
2714 DBGINFO(("%s rx_enable(%08x)\n", info->device_name, enable));
2715 spin_lock_irqsave(&info->lock,flags);
2716 /*
2717 * enable[31..16] = receive DMA buffer fill level
2718 * 0 = noop (leave fill level unchanged)
2719 * fill level must be multiple of 4 and <= buffer size
2720 */
2721 rbuf_fill_level = ((unsigned int)enable) >> 16;
2722 if (rbuf_fill_level) {
2723 if ((rbuf_fill_level > DMABUFSIZE) || (rbuf_fill_level % 4)) {
2724 spin_unlock_irqrestore(&info->lock, flags);
2725 return -EINVAL;
2726 }
2727 info->rbuf_fill_level = rbuf_fill_level;
2728 if (rbuf_fill_level < 128)
2729 info->rx_pio = 1; /* PIO mode */
2730 else
2731 info->rx_pio = 0; /* DMA mode */
2732 rx_stop(info); /* restart receiver to use new fill level */
2733 }
2734
2735 /*
2736 * enable[1..0] = receiver enable command
2737 * 0 = disable
2738 * 1 = enable
2739 * 2 = enable or force hunt mode if already enabled
2740 */
2741 enable &= 3;
2742 if (enable) {
2743 if (!info->rx_enabled)
2744 rx_start(info);
2745 else if (enable == 2) {
2746 /* force hunt mode (write 1 to RCR[3]) */
2747 wr_reg16(info, RCR, rd_reg16(info, RCR) | BIT3);
2748 }
2749 } else {
2750 if (info->rx_enabled)
2751 rx_stop(info);
2752 }
2753 spin_unlock_irqrestore(&info->lock,flags);
2754 return 0;
2755 }
2756
2757 /*
2758 * wait for specified event to occur
2759 */
2760 static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr)
2761 {
2762 unsigned long flags;
2763 int s;
2764 int rc=0;
2765 struct mgsl_icount cprev, cnow;
2766 int events;
2767 int mask;
2768 struct _input_signal_events oldsigs, newsigs;
2769 DECLARE_WAITQUEUE(wait, current);
2770
2771 if (get_user(mask, mask_ptr))
2772 return -EFAULT;
2773
2774 DBGINFO(("%s wait_mgsl_event(%d)\n", info->device_name, mask));
2775
2776 spin_lock_irqsave(&info->lock,flags);
2777
2778 /* return immediately if state matches requested events */
2779 get_signals(info);
2780 s = info->signals;
2781
2782 events = mask &
2783 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2784 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2785 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2786 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2787 if (events) {
2788 spin_unlock_irqrestore(&info->lock,flags);
2789 goto exit;
2790 }
2791
2792 /* save current irq counts */
2793 cprev = info->icount;
2794 oldsigs = info->input_signal_events;
2795
2796 /* enable hunt and idle irqs if needed */
2797 if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
2798 unsigned short val = rd_reg16(info, SCR);
2799 if (!(val & IRQ_RXIDLE))
2800 wr_reg16(info, SCR, (unsigned short)(val | IRQ_RXIDLE));
2801 }
2802
2803 set_current_state(TASK_INTERRUPTIBLE);
2804 add_wait_queue(&info->event_wait_q, &wait);
2805
2806 spin_unlock_irqrestore(&info->lock,flags);
2807
2808 for(;;) {
2809 schedule();
2810 if (signal_pending(current)) {
2811 rc = -ERESTARTSYS;
2812 break;
2813 }
2814
2815 /* get current irq counts */
2816 spin_lock_irqsave(&info->lock,flags);
2817 cnow = info->icount;
2818 newsigs = info->input_signal_events;
2819 set_current_state(TASK_INTERRUPTIBLE);
2820 spin_unlock_irqrestore(&info->lock,flags);
2821
2822 /* if no change, wait aborted for some reason */
2823 if (newsigs.dsr_up == oldsigs.dsr_up &&
2824 newsigs.dsr_down == oldsigs.dsr_down &&
2825 newsigs.dcd_up == oldsigs.dcd_up &&
2826 newsigs.dcd_down == oldsigs.dcd_down &&
2827 newsigs.cts_up == oldsigs.cts_up &&
2828 newsigs.cts_down == oldsigs.cts_down &&
2829 newsigs.ri_up == oldsigs.ri_up &&
2830 newsigs.ri_down == oldsigs.ri_down &&
2831 cnow.exithunt == cprev.exithunt &&
2832 cnow.rxidle == cprev.rxidle) {
2833 rc = -EIO;
2834 break;
2835 }
2836
2837 events = mask &
2838 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2839 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2840 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2841 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2842 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2843 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2844 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2845 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2846 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2847 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2848 if (events)
2849 break;
2850
2851 cprev = cnow;
2852 oldsigs = newsigs;
2853 }
2854
2855 remove_wait_queue(&info->event_wait_q, &wait);
2856 set_current_state(TASK_RUNNING);
2857
2858
2859 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2860 spin_lock_irqsave(&info->lock,flags);
2861 if (!waitqueue_active(&info->event_wait_q)) {
2862 /* disable enable exit hunt mode/idle rcvd IRQs */
2863 wr_reg16(info, SCR,
2864 (unsigned short)(rd_reg16(info, SCR) & ~IRQ_RXIDLE));
2865 }
2866 spin_unlock_irqrestore(&info->lock,flags);
2867 }
2868 exit:
2869 if (rc == 0)
2870 rc = put_user(events, mask_ptr);
2871 return rc;
2872 }
2873
2874 static int get_interface(struct slgt_info *info, int __user *if_mode)
2875 {
2876 DBGINFO(("%s get_interface=%x\n", info->device_name, info->if_mode));
2877 if (put_user(info->if_mode, if_mode))
2878 return -EFAULT;
2879 return 0;
2880 }
2881
2882 static int set_interface(struct slgt_info *info, int if_mode)
2883 {
2884 unsigned long flags;
2885 unsigned short val;
2886
2887 DBGINFO(("%s set_interface=%x)\n", info->device_name, if_mode));
2888 spin_lock_irqsave(&info->lock,flags);
2889 info->if_mode = if_mode;
2890
2891 msc_set_vcr(info);
2892
2893 /* TCR (tx control) 07 1=RTS driver control */
2894 val = rd_reg16(info, TCR);
2895 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
2896 val |= BIT7;
2897 else
2898 val &= ~BIT7;
2899 wr_reg16(info, TCR, val);
2900
2901 spin_unlock_irqrestore(&info->lock,flags);
2902 return 0;
2903 }
2904
2905 static int get_xsync(struct slgt_info *info, int __user *xsync)
2906 {
2907 DBGINFO(("%s get_xsync=%x\n", info->device_name, info->xsync));
2908 if (put_user(info->xsync, xsync))
2909 return -EFAULT;
2910 return 0;
2911 }
2912
2913 /*
2914 * set extended sync pattern (1 to 4 bytes) for extended sync mode
2915 *
2916 * sync pattern is contained in least significant bytes of value
2917 * most significant byte of sync pattern is oldest (1st sent/detected)
2918 */
2919 static int set_xsync(struct slgt_info *info, int xsync)
2920 {
2921 unsigned long flags;
2922
2923 DBGINFO(("%s set_xsync=%x)\n", info->device_name, xsync));
2924 spin_lock_irqsave(&info->lock, flags);
2925 info->xsync = xsync;
2926 wr_reg32(info, XSR, xsync);
2927 spin_unlock_irqrestore(&info->lock, flags);
2928 return 0;
2929 }
2930
2931 static int get_xctrl(struct slgt_info *info, int __user *xctrl)
2932 {
2933 DBGINFO(("%s get_xctrl=%x\n", info->device_name, info->xctrl));
2934 if (put_user(info->xctrl, xctrl))
2935 return -EFAULT;
2936 return 0;
2937 }
2938
2939 /*
2940 * set extended control options
2941 *
2942 * xctrl[31:19] reserved, must be zero
2943 * xctrl[18:17] extended sync pattern length in bytes
2944 * 00 = 1 byte in xsr[7:0]
2945 * 01 = 2 bytes in xsr[15:0]
2946 * 10 = 3 bytes in xsr[23:0]
2947 * 11 = 4 bytes in xsr[31:0]
2948 * xctrl[16] 1 = enable terminal count, 0=disabled
2949 * xctrl[15:0] receive terminal count for fixed length packets
2950 * value is count minus one (0 = 1 byte packet)
2951 * when terminal count is reached, receiver
2952 * automatically returns to hunt mode and receive
2953 * FIFO contents are flushed to DMA buffers with
2954 * end of frame (EOF) status
2955 */
2956 static int set_xctrl(struct slgt_info *info, int xctrl)
2957 {
2958 unsigned long flags;
2959
2960 DBGINFO(("%s set_xctrl=%x)\n", info->device_name, xctrl));
2961 spin_lock_irqsave(&info->lock, flags);
2962 info->xctrl = xctrl;
2963 wr_reg32(info, XCR, xctrl);
2964 spin_unlock_irqrestore(&info->lock, flags);
2965 return 0;
2966 }
2967
2968 /*
2969 * set general purpose IO pin state and direction
2970 *
2971 * user_gpio fields:
2972 * state each bit indicates a pin state
2973 * smask set bit indicates pin state to set
2974 * dir each bit indicates a pin direction (0=input, 1=output)
2975 * dmask set bit indicates pin direction to set
2976 */
2977 static int set_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2978 {
2979 unsigned long flags;
2980 struct gpio_desc gpio;
2981 __u32 data;
2982
2983 if (!info->gpio_present)
2984 return -EINVAL;
2985 if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2986 return -EFAULT;
2987 DBGINFO(("%s set_gpio state=%08x smask=%08x dir=%08x dmask=%08x\n",
2988 info->device_name, gpio.state, gpio.smask,
2989 gpio.dir, gpio.dmask));
2990
2991 spin_lock_irqsave(&info->port_array[0]->lock, flags);
2992 if (gpio.dmask) {
2993 data = rd_reg32(info, IODR);
2994 data |= gpio.dmask & gpio.dir;
2995 data &= ~(gpio.dmask & ~gpio.dir);
2996 wr_reg32(info, IODR, data);
2997 }
2998 if (gpio.smask) {
2999 data = rd_reg32(info, IOVR);
3000 data |= gpio.smask & gpio.state;
3001 data &= ~(gpio.smask & ~gpio.state);
3002 wr_reg32(info, IOVR, data);
3003 }
3004 spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
3005
3006 return 0;
3007 }
3008
3009 /*
3010 * get general purpose IO pin state and direction
3011 */
3012 static int get_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
3013 {
3014 struct gpio_desc gpio;
3015 if (!info->gpio_present)
3016 return -EINVAL;
3017 gpio.state = rd_reg32(info, IOVR);
3018 gpio.smask = 0xffffffff;
3019 gpio.dir = rd_reg32(info, IODR);
3020 gpio.dmask = 0xffffffff;
3021 if (copy_to_user(user_gpio, &gpio, sizeof(gpio)))
3022 return -EFAULT;
3023 DBGINFO(("%s get_gpio state=%08x dir=%08x\n",
3024 info->device_name, gpio.state, gpio.dir));
3025 return 0;
3026 }
3027
3028 /*
3029 * conditional wait facility
3030 */
3031 static void init_cond_wait(struct cond_wait *w, unsigned int data)
3032 {
3033 init_waitqueue_head(&w->q);
3034 init_waitqueue_entry(&w->wait, current);
3035 w->data = data;
3036 }
3037
3038 static void add_cond_wait(struct cond_wait **head, struct cond_wait *w)
3039 {
3040 set_current_state(TASK_INTERRUPTIBLE);
3041 add_wait_queue(&w->q, &w->wait);
3042 w->next = *head;
3043 *head = w;
3044 }
3045
3046 static void remove_cond_wait(struct cond_wait **head, struct cond_wait *cw)
3047 {
3048 struct cond_wait *w, *prev;
3049 remove_wait_queue(&cw->q, &cw->wait);
3050 set_current_state(TASK_RUNNING);
3051 for (w = *head, prev = NULL ; w != NULL ; prev = w, w = w->next) {
3052 if (w == cw) {
3053 if (prev != NULL)
3054 prev->next = w->next;
3055 else
3056 *head = w->next;
3057 break;
3058 }
3059 }
3060 }
3061
3062 static void flush_cond_wait(struct cond_wait **head)
3063 {
3064 while (*head != NULL) {
3065 wake_up_interruptible(&(*head)->q);
3066 *head = (*head)->next;
3067 }
3068 }
3069
3070 /*
3071 * wait for general purpose I/O pin(s) to enter specified state
3072 *
3073 * user_gpio fields:
3074 * state - bit indicates target pin state
3075 * smask - set bit indicates watched pin
3076 *
3077 * The wait ends when at least one watched pin enters the specified
3078 * state. When 0 (no error) is returned, user_gpio->state is set to the
3079 * state of all GPIO pins when the wait ends.
3080 *
3081 * Note: Each pin may be a dedicated input, dedicated output, or
3082 * configurable input/output. The number and configuration of pins
3083 * varies with the specific adapter model. Only input pins (dedicated
3084 * or configured) can be monitored with this function.
3085 */
3086 static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
3087 {
3088 unsigned long flags;
3089 int rc = 0;
3090 struct gpio_desc gpio;
3091 struct cond_wait wait;
3092 u32 state;
3093
3094 if (!info->gpio_present)
3095 return -EINVAL;
3096 if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
3097 return -EFAULT;
3098 DBGINFO(("%s wait_gpio() state=%08x smask=%08x\n",
3099 info->device_name, gpio.state, gpio.smask));
3100 /* ignore output pins identified by set IODR bit */
3101 if ((gpio.smask &= ~rd_reg32(info, IODR)) == 0)
3102 return -EINVAL;
3103 init_cond_wait(&wait, gpio.smask);
3104
3105 spin_lock_irqsave(&info->port_array[0]->lock, flags);
3106 /* enable interrupts for watched pins */
3107 wr_reg32(info, IOER, rd_reg32(info, IOER) | gpio.smask);
3108 /* get current pin states */
3109 state = rd_reg32(info, IOVR);
3110
3111 if (gpio.smask & ~(state ^ gpio.state)) {
3112 /* already in target state */
3113 gpio.state = state;
3114 } else {
3115 /* wait for target state */
3116 add_cond_wait(&info->gpio_wait_q, &wait);
3117 spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
3118 schedule();
3119 if (signal_pending(current))
3120 rc = -ERESTARTSYS;
3121 else
3122 gpio.state = wait.data;
3123 spin_lock_irqsave(&info->port_array[0]->lock, flags);
3124 remove_cond_wait(&info->gpio_wait_q, &wait);
3125 }
3126
3127 /* disable all GPIO interrupts if no waiting processes */
3128 if (info->gpio_wait_q == NULL)
3129 wr_reg32(info, IOER, 0);
3130 spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
3131
3132 if ((rc == 0) && copy_to_user(user_gpio, &gpio, sizeof(gpio)))
3133 rc = -EFAULT;
3134 return rc;
3135 }
3136
3137 static int modem_input_wait(struct slgt_info *info,int arg)
3138 {
3139 unsigned long flags;
3140 int rc;
3141 struct mgsl_icount cprev, cnow;
3142 DECLARE_WAITQUEUE(wait, current);
3143
3144 /* save current irq counts */
3145 spin_lock_irqsave(&info->lock,flags);
3146 cprev = info->icount;
3147 add_wait_queue(&info->status_event_wait_q, &wait);
3148 set_current_state(TASK_INTERRUPTIBLE);
3149 spin_unlock_irqrestore(&info->lock,flags);
3150
3151 for(;;) {
3152 schedule();
3153 if (signal_pending(current)) {
3154 rc = -ERESTARTSYS;
3155 break;
3156 }
3157
3158 /* get new irq counts */
3159 spin_lock_irqsave(&info->lock,flags);
3160 cnow = info->icount;
3161 set_current_state(TASK_INTERRUPTIBLE);
3162 spin_unlock_irqrestore(&info->lock,flags);
3163
3164 /* if no change, wait aborted for some reason */
3165 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3166 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3167 rc = -EIO;
3168 break;
3169 }
3170
3171 /* check for change in caller specified modem input */
3172 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3173 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3174 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
3175 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3176 rc = 0;
3177 break;
3178 }
3179
3180 cprev = cnow;
3181 }
3182 remove_wait_queue(&info->status_event_wait_q, &wait);
3183 set_current_state(TASK_RUNNING);
3184 return rc;
3185 }
3186
3187 /*
3188 * return state of serial control and status signals
3189 */
3190 static int tiocmget(struct tty_struct *tty)
3191 {
3192 struct slgt_info *info = tty->driver_data;
3193 unsigned int result;
3194 unsigned long flags;
3195
3196 spin_lock_irqsave(&info->lock,flags);
3197 get_signals(info);
3198 spin_unlock_irqrestore(&info->lock,flags);
3199
3200 result = ((info->signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3201 ((info->signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3202 ((info->signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3203 ((info->signals & SerialSignal_RI) ? TIOCM_RNG:0) +
3204 ((info->signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3205 ((info->signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3206
3207 DBGINFO(("%s tiocmget value=%08X\n", info->device_name, result));
3208 return result;
3209 }
3210
3211 /*
3212 * set modem control signals (DTR/RTS)
3213 *
3214 * cmd signal command: TIOCMBIS = set bit TIOCMBIC = clear bit
3215 * TIOCMSET = set/clear signal values
3216 * value bit mask for command
3217 */
3218 static int tiocmset(struct tty_struct *tty,
3219 unsigned int set, unsigned int clear)
3220 {
3221 struct slgt_info *info = tty->driver_data;
3222 unsigned long flags;
3223
3224 DBGINFO(("%s tiocmset(%x,%x)\n", info->device_name, set, clear));
3225
3226 if (set & TIOCM_RTS)
3227 info->signals |= SerialSignal_RTS;
3228 if (set & TIOCM_DTR)
3229 info->signals |= SerialSignal_DTR;
3230 if (clear & TIOCM_RTS)
3231 info->signals &= ~SerialSignal_RTS;
3232 if (clear & TIOCM_DTR)
3233 info->signals &= ~SerialSignal_DTR;
3234
3235 spin_lock_irqsave(&info->lock,flags);
3236 set_signals(info);
3237 spin_unlock_irqrestore(&info->lock,flags);
3238 return 0;
3239 }
3240
3241 static int carrier_raised(struct tty_port *port)
3242 {
3243 unsigned long flags;
3244 struct slgt_info *info = container_of(port, struct slgt_info, port);
3245
3246 spin_lock_irqsave(&info->lock,flags);
3247 get_signals(info);
3248 spin_unlock_irqrestore(&info->lock,flags);
3249 return (info->signals & SerialSignal_DCD) ? 1 : 0;
3250 }
3251
3252 static void dtr_rts(struct tty_port *port, int on)
3253 {
3254 unsigned long flags;
3255 struct slgt_info *info = container_of(port, struct slgt_info, port);
3256
3257 spin_lock_irqsave(&info->lock,flags);
3258 if (on)
3259 info->signals |= SerialSignal_RTS | SerialSignal_DTR;
3260 else
3261 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
3262 set_signals(info);
3263 spin_unlock_irqrestore(&info->lock,flags);
3264 }
3265
3266
3267 /*
3268 * block current process until the device is ready to open
3269 */
3270 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3271 struct slgt_info *info)
3272 {
3273 DECLARE_WAITQUEUE(wait, current);
3274 int retval;
3275 bool do_clocal = false;
3276 bool extra_count = false;
3277 unsigned long flags;
3278 int cd;
3279 struct tty_port *port = &info->port;
3280
3281 DBGINFO(("%s block_til_ready\n", tty->driver->name));
3282
3283 if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3284 /* nonblock mode is set or port is not enabled */
3285 port->flags |= ASYNC_NORMAL_ACTIVE;
3286 return 0;
3287 }
3288
3289 if (tty->termios.c_cflag & CLOCAL)
3290 do_clocal = true;
3291
3292 /* Wait for carrier detect and the line to become
3293 * free (i.e., not in use by the callout). While we are in
3294 * this loop, port->count is dropped by one, so that
3295 * close() knows when to free things. We restore it upon
3296 * exit, either normal or abnormal.
3297 */
3298
3299 retval = 0;
3300 add_wait_queue(&port->open_wait, &wait);
3301
3302 spin_lock_irqsave(&info->lock, flags);
3303 if (!tty_hung_up_p(filp)) {
3304 extra_count = true;
3305 port->count--;
3306 }
3307 spin_unlock_irqrestore(&info->lock, flags);
3308 port->blocked_open++;
3309
3310 while (1) {
3311 if (C_BAUD(tty) && test_bit(ASYNCB_INITIALIZED, &port->flags))
3312 tty_port_raise_dtr_rts(port);
3313
3314 set_current_state(TASK_INTERRUPTIBLE);
3315
3316 if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){
3317 retval = (port->flags & ASYNC_HUP_NOTIFY) ?
3318 -EAGAIN : -ERESTARTSYS;
3319 break;
3320 }
3321
3322 cd = tty_port_carrier_raised(port);
3323
3324 if (!(port->flags & ASYNC_CLOSING) && (do_clocal || cd ))
3325 break;
3326
3327 if (signal_pending(current)) {
3328 retval = -ERESTARTSYS;
3329 break;
3330 }
3331
3332 DBGINFO(("%s block_til_ready wait\n", tty->driver->name));
3333 tty_unlock(tty);
3334 schedule();
3335 tty_lock(tty);
3336 }
3337
3338 set_current_state(TASK_RUNNING);
3339 remove_wait_queue(&port->open_wait, &wait);
3340
3341 if (extra_count)
3342 port->count++;
3343 port->blocked_open--;
3344
3345 if (!retval)
3346 port->flags |= ASYNC_NORMAL_ACTIVE;
3347
3348 DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval));
3349 return retval;
3350 }
3351
3352 /*
3353 * allocate buffers used for calling line discipline receive_buf
3354 * directly in synchronous mode
3355 * note: add 5 bytes to max frame size to allow appending
3356 * 32-bit CRC and status byte when configured to do so
3357 */
3358 static int alloc_tmp_rbuf(struct slgt_info *info)
3359 {
3360 info->tmp_rbuf = kmalloc(info->max_frame_size + 5, GFP_KERNEL);
3361 if (info->tmp_rbuf == NULL)
3362 return -ENOMEM;
3363 /* unused flag buffer to satisfy receive_buf calling interface */
3364 info->flag_buf = kzalloc(info->max_frame_size + 5, GFP_KERNEL);
3365 if (!info->flag_buf) {
3366 kfree(info->tmp_rbuf);
3367 info->tmp_rbuf = NULL;
3368 return -ENOMEM;
3369 }
3370 return 0;
3371 }
3372
3373 static void free_tmp_rbuf(struct slgt_info *info)
3374 {
3375 kfree(info->tmp_rbuf);
3376 info->tmp_rbuf = NULL;
3377 kfree(info->flag_buf);
3378 info->flag_buf = NULL;
3379 }
3380
3381 /*
3382 * allocate DMA descriptor lists.
3383 */
3384 static int alloc_desc(struct slgt_info *info)
3385 {
3386 unsigned int i;
3387 unsigned int pbufs;
3388
3389 /* allocate memory to hold descriptor lists */
3390 info->bufs = pci_alloc_consistent(info->pdev, DESC_LIST_SIZE, &info->bufs_dma_addr);
3391 if (info->bufs == NULL)
3392 return -ENOMEM;
3393
3394 memset(info->bufs, 0, DESC_LIST_SIZE);
3395
3396 info->rbufs = (struct slgt_desc*)info->bufs;
3397 info->tbufs = ((struct slgt_desc*)info->bufs) + info->rbuf_count;
3398
3399 pbufs = (unsigned int)info->bufs_dma_addr;
3400
3401 /*
3402 * Build circular lists of descriptors
3403 */
3404
3405 for (i=0; i < info->rbuf_count; i++) {
3406 /* physical address of this descriptor */
3407 info->rbufs[i].pdesc = pbufs + (i * sizeof(struct slgt_desc));
3408
3409 /* physical address of next descriptor */
3410 if (i == info->rbuf_count - 1)
3411 info->rbufs[i].next = cpu_to_le32(pbufs);
3412 else
3413 info->rbufs[i].next = cpu_to_le32(pbufs + ((i+1) * sizeof(struct slgt_desc)));
3414 set_desc_count(info->rbufs[i], DMABUFSIZE);
3415 }
3416
3417 for (i=0; i < info->tbuf_count; i++) {
3418 /* physical address of this descriptor */
3419 info->tbufs[i].pdesc = pbufs + ((info->rbuf_count + i) * sizeof(struct slgt_desc));
3420
3421 /* physical address of next descriptor */
3422 if (i == info->tbuf_count - 1)
3423 info->tbufs[i].next = cpu_to_le32(pbufs + info->rbuf_count * sizeof(struct slgt_desc));
3424 else
3425 info->tbufs[i].next = cpu_to_le32(pbufs + ((info->rbuf_count + i + 1) * sizeof(struct slgt_desc)));
3426 }
3427
3428 return 0;
3429 }
3430
3431 static void free_desc(struct slgt_info *info)
3432 {
3433 if (info->bufs != NULL) {
3434 pci_free_consistent(info->pdev, DESC_LIST_SIZE, info->bufs, info->bufs_dma_addr);
3435 info->bufs = NULL;
3436 info->rbufs = NULL;
3437 info->tbufs = NULL;
3438 }
3439 }
3440
3441 static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3442 {
3443 int i;
3444 for (i=0; i < count; i++) {
3445 if ((bufs[i].buf = pci_alloc_consistent(info->pdev, DMABUFSIZE, &bufs[i].buf_dma_addr)) == NULL)
3446 return -ENOMEM;
3447 bufs[i].pbuf = cpu_to_le32((unsigned int)bufs[i].buf_dma_addr);
3448 }
3449 return 0;
3450 }
3451
3452 static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3453 {
3454 int i;
3455 for (i=0; i < count; i++) {
3456 if (bufs[i].buf == NULL)
3457 continue;
3458 pci_free_consistent(info->pdev, DMABUFSIZE, bufs[i].buf, bufs[i].buf_dma_addr);
3459 bufs[i].buf = NULL;
3460 }
3461 }
3462
3463 static int alloc_dma_bufs(struct slgt_info *info)
3464 {
3465 info->rbuf_count = 32;
3466 info->tbuf_count = 32;
3467
3468 if (alloc_desc(info) < 0 ||
3469 alloc_bufs(info, info->rbufs, info->rbuf_count) < 0 ||
3470 alloc_bufs(info, info->tbufs, info->tbuf_count) < 0 ||
3471 alloc_tmp_rbuf(info) < 0) {
3472 DBGERR(("%s DMA buffer alloc fail\n", info->device_name));
3473 return -ENOMEM;
3474 }
3475 reset_rbufs(info);
3476 return 0;
3477 }
3478
3479 static void free_dma_bufs(struct slgt_info *info)
3480 {
3481 if (info->bufs) {
3482 free_bufs(info, info->rbufs, info->rbuf_count);
3483 free_bufs(info, info->tbufs, info->tbuf_count);
3484 free_desc(info);
3485 }
3486 free_tmp_rbuf(info);
3487 }
3488
3489 static int claim_resources(struct slgt_info *info)
3490 {
3491 if (request_mem_region(info->phys_reg_addr, SLGT_REG_SIZE, "synclink_gt") == NULL) {
3492 DBGERR(("%s reg addr conflict, addr=%08X\n",
3493 info->device_name, info->phys_reg_addr));
3494 info->init_error = DiagStatus_AddressConflict;
3495 goto errout;
3496 }
3497 else
3498 info->reg_addr_requested = true;
3499
3500 info->reg_addr = ioremap_nocache(info->phys_reg_addr, SLGT_REG_SIZE);
3501 if (!info->reg_addr) {
3502 DBGERR(("%s can't map device registers, addr=%08X\n",
3503 info->device_name, info->phys_reg_addr));
3504 info->init_error = DiagStatus_CantAssignPciResources;
3505 goto errout;
3506 }
3507 return 0;
3508
3509 errout:
3510 release_resources(info);
3511 return -ENODEV;
3512 }
3513
3514 static void release_resources(struct slgt_info *info)
3515 {
3516 if (info->irq_requested) {
3517 free_irq(info->irq_level, info);
3518 info->irq_requested = false;
3519 }
3520
3521 if (info->reg_addr_requested) {
3522 release_mem_region(info->phys_reg_addr, SLGT_REG_SIZE);
3523 info->reg_addr_requested = false;
3524 }
3525
3526 if (info->reg_addr) {
3527 iounmap(info->reg_addr);
3528 info->reg_addr = NULL;
3529 }
3530 }
3531
3532 /* Add the specified device instance data structure to the
3533 * global linked list of devices and increment the device count.
3534 */
3535 static void add_device(struct slgt_info *info)
3536 {
3537 char *devstr;
3538
3539 info->next_device = NULL;
3540 info->line = slgt_device_count;
3541 sprintf(info->device_name, "%s%d", tty_dev_prefix, info->line);
3542
3543 if (info->line < MAX_DEVICES) {
3544 if (maxframe[info->line])
3545 info->max_frame_size = maxframe[info->line];
3546 }
3547
3548 slgt_device_count++;
3549
3550 if (!slgt_device_list)
3551 slgt_device_list = info;
3552 else {
3553 struct slgt_info *current_dev = slgt_device_list;
3554 while(current_dev->next_device)
3555 current_dev = current_dev->next_device;
3556 current_dev->next_device = info;
3557 }
3558
3559 if (info->max_frame_size < 4096)
3560 info->max_frame_size = 4096;
3561 else if (info->max_frame_size > 65535)
3562 info->max_frame_size = 65535;
3563
3564 switch(info->pdev->device) {
3565 case SYNCLINK_GT_DEVICE_ID:
3566 devstr = "GT";
3567 break;
3568 case SYNCLINK_GT2_DEVICE_ID:
3569 devstr = "GT2";
3570 break;
3571 case SYNCLINK_GT4_DEVICE_ID:
3572 devstr = "GT4";
3573 break;
3574 case SYNCLINK_AC_DEVICE_ID:
3575 devstr = "AC";
3576 info->params.mode = MGSL_MODE_ASYNC;
3577 break;
3578 default:
3579 devstr = "(unknown model)";
3580 }
3581 printk("SyncLink %s %s IO=%08x IRQ=%d MaxFrameSize=%u\n",
3582 devstr, info->device_name, info->phys_reg_addr,
3583 info->irq_level, info->max_frame_size);
3584
3585 #if SYNCLINK_GENERIC_HDLC
3586 hdlcdev_init(info);
3587 #endif
3588 }
3589
3590 static const struct tty_port_operations slgt_port_ops = {
3591 .carrier_raised = carrier_raised,
3592 .dtr_rts = dtr_rts,
3593 };
3594
3595 /*
3596 * allocate device instance structure, return NULL on failure
3597 */
3598 static struct slgt_info *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3599 {
3600 struct slgt_info *info;
3601
3602 info = kzalloc(sizeof(struct slgt_info), GFP_KERNEL);
3603
3604 if (!info) {
3605 DBGERR(("%s device alloc failed adapter=%d port=%d\n",
3606 driver_name, adapter_num, port_num));
3607 } else {
3608 tty_port_init(&info->port);
3609 info->port.ops = &slgt_port_ops;
3610 info->magic = MGSL_MAGIC;
3611 INIT_WORK(&info->task, bh_handler);
3612 info->max_frame_size = 4096;
3613 info->base_clock = 14745600;
3614 info->rbuf_fill_level = DMABUFSIZE;
3615 info->port.close_delay = 5*HZ/10;
3616 info->port.closing_wait = 30*HZ;
3617 init_waitqueue_head(&info->status_event_wait_q);
3618 init_waitqueue_head(&info->event_wait_q);
3619 spin_lock_init(&info->netlock);
3620 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3621 info->idle_mode = HDLC_TXIDLE_FLAGS;
3622 info->adapter_num = adapter_num;
3623 info->port_num = port_num;
3624
3625 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
3626 setup_timer(&info->rx_timer, rx_timeout, (unsigned long)info);
3627
3628 /* Copy configuration info to device instance data */
3629 info->pdev = pdev;
3630 info->irq_level = pdev->irq;
3631 info->phys_reg_addr = pci_resource_start(pdev,0);
3632
3633 info->bus_type = MGSL_BUS_TYPE_PCI;
3634 info->irq_flags = IRQF_SHARED;
3635
3636 info->init_error = -1; /* assume error, set to 0 on successful init */
3637 }
3638
3639 return info;
3640 }
3641
3642 static void device_init(int adapter_num, struct pci_dev *pdev)
3643 {
3644 struct slgt_info *port_array[SLGT_MAX_PORTS];
3645 int i;
3646 int port_count = 1;
3647
3648 if (pdev->device == SYNCLINK_GT2_DEVICE_ID)
3649 port_count = 2;
3650 else if (pdev->device == SYNCLINK_GT4_DEVICE_ID)
3651 port_count = 4;
3652
3653 /* allocate device instances for all ports */
3654 for (i=0; i < port_count; ++i) {
3655 port_array[i] = alloc_dev(adapter_num, i, pdev);
3656 if (port_array[i] == NULL) {
3657 for (--i; i >= 0; --i) {
3658 tty_port_destroy(&port_array[i]->port);
3659 kfree(port_array[i]);
3660 }
3661 return;
3662 }
3663 }
3664
3665 /* give copy of port_array to all ports and add to device list */
3666 for (i=0; i < port_count; ++i) {
3667 memcpy(port_array[i]->port_array, port_array, sizeof(port_array));
3668 add_device(port_array[i]);
3669 port_array[i]->port_count = port_count;
3670 spin_lock_init(&port_array[i]->lock);
3671 }
3672
3673 /* Allocate and claim adapter resources */
3674 if (!claim_resources(port_array[0])) {
3675
3676 alloc_dma_bufs(port_array[0]);
3677
3678 /* copy resource information from first port to others */
3679 for (i = 1; i < port_count; ++i) {
3680 port_array[i]->irq_level = port_array[0]->irq_level;
3681 port_array[i]->reg_addr = port_array[0]->reg_addr;
3682 alloc_dma_bufs(port_array[i]);
3683 }
3684
3685 if (request_irq(port_array[0]->irq_level,
3686 slgt_interrupt,
3687 port_array[0]->irq_flags,
3688 port_array[0]->device_name,
3689 port_array[0]) < 0) {
3690 DBGERR(("%s request_irq failed IRQ=%d\n",
3691 port_array[0]->device_name,
3692 port_array[0]->irq_level));
3693 } else {
3694 port_array[0]->irq_requested = true;
3695 adapter_test(port_array[0]);
3696 for (i=1 ; i < port_count ; i++) {
3697 port_array[i]->init_error = port_array[0]->init_error;
3698 port_array[i]->gpio_present = port_array[0]->gpio_present;
3699 }
3700 }
3701 }
3702
3703 for (i = 0; i < port_count; ++i) {
3704 struct slgt_info *info = port_array[i];
3705 tty_port_register_device(&info->port, serial_driver, info->line,
3706 &info->pdev->dev);
3707 }
3708 }
3709
3710 static int init_one(struct pci_dev *dev,
3711 const struct pci_device_id *ent)
3712 {
3713 if (pci_enable_device(dev)) {
3714 printk("error enabling pci device %p\n", dev);
3715 return -EIO;
3716 }
3717 pci_set_master(dev);
3718 device_init(slgt_device_count, dev);
3719 return 0;
3720 }
3721
3722 static void remove_one(struct pci_dev *dev)
3723 {
3724 }
3725
3726 static const struct tty_operations ops = {
3727 .open = open,
3728 .close = close,
3729 .write = write,
3730 .put_char = put_char,
3731 .flush_chars = flush_chars,
3732 .write_room = write_room,
3733 .chars_in_buffer = chars_in_buffer,
3734 .flush_buffer = flush_buffer,
3735 .ioctl = ioctl,
3736 .compat_ioctl = slgt_compat_ioctl,
3737 .throttle = throttle,
3738 .unthrottle = unthrottle,
3739 .send_xchar = send_xchar,
3740 .break_ctl = set_break,
3741 .wait_until_sent = wait_until_sent,
3742 .set_termios = set_termios,
3743 .stop = tx_hold,
3744 .start = tx_release,
3745 .hangup = hangup,
3746 .tiocmget = tiocmget,
3747 .tiocmset = tiocmset,
3748 .get_icount = get_icount,
3749 .proc_fops = &synclink_gt_proc_fops,
3750 };
3751
3752 static void slgt_cleanup(void)
3753 {
3754 int rc;
3755 struct slgt_info *info;
3756 struct slgt_info *tmp;
3757
3758 printk(KERN_INFO "unload %s\n", driver_name);
3759
3760 if (serial_driver) {
3761 for (info=slgt_device_list ; info != NULL ; info=info->next_device)
3762 tty_unregister_device(serial_driver, info->line);
3763 if ((rc = tty_unregister_driver(serial_driver)))
3764 DBGERR(("tty_unregister_driver error=%d\n", rc));
3765 put_tty_driver(serial_driver);
3766 }
3767
3768 /* reset devices */
3769 info = slgt_device_list;
3770 while(info) {
3771 reset_port(info);
3772 info = info->next_device;
3773 }
3774
3775 /* release devices */
3776 info = slgt_device_list;
3777 while(info) {
3778 #if SYNCLINK_GENERIC_HDLC
3779 hdlcdev_exit(info);
3780 #endif
3781 free_dma_bufs(info);
3782 free_tmp_rbuf(info);
3783 if (info->port_num == 0)
3784 release_resources(info);
3785 tmp = info;
3786 info = info->next_device;
3787 tty_port_destroy(&tmp->port);
3788 kfree(tmp);
3789 }
3790
3791 if (pci_registered)
3792 pci_unregister_driver(&pci_driver);
3793 }
3794
3795 /*
3796 * Driver initialization entry point.
3797 */
3798 static int __init slgt_init(void)
3799 {
3800 int rc;
3801
3802 printk(KERN_INFO "%s\n", driver_name);
3803
3804 serial_driver = alloc_tty_driver(MAX_DEVICES);
3805 if (!serial_driver) {
3806 printk("%s can't allocate tty driver\n", driver_name);
3807 return -ENOMEM;
3808 }
3809
3810 /* Initialize the tty_driver structure */
3811
3812 serial_driver->driver_name = tty_driver_name;
3813 serial_driver->name = tty_dev_prefix;
3814 serial_driver->major = ttymajor;
3815 serial_driver->minor_start = 64;
3816 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3817 serial_driver->subtype = SERIAL_TYPE_NORMAL;
3818 serial_driver->init_termios = tty_std_termios;
3819 serial_driver->init_termios.c_cflag =
3820 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3821 serial_driver->init_termios.c_ispeed = 9600;
3822 serial_driver->init_termios.c_ospeed = 9600;
3823 serial_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
3824 tty_set_operations(serial_driver, &ops);
3825 if ((rc = tty_register_driver(serial_driver)) < 0) {
3826 DBGERR(("%s can't register serial driver\n", driver_name));
3827 put_tty_driver(serial_driver);
3828 serial_driver = NULL;
3829 goto error;
3830 }
3831
3832 printk(KERN_INFO "%s, tty major#%d\n",
3833 driver_name, serial_driver->major);
3834
3835 slgt_device_count = 0;
3836 if ((rc = pci_register_driver(&pci_driver)) < 0) {
3837 printk("%s pci_register_driver error=%d\n", driver_name, rc);
3838 goto error;
3839 }
3840 pci_registered = true;
3841
3842 if (!slgt_device_list)
3843 printk("%s no devices found\n",driver_name);
3844
3845 return 0;
3846
3847 error:
3848 slgt_cleanup();
3849 return rc;
3850 }
3851
3852 static void __exit slgt_exit(void)
3853 {
3854 slgt_cleanup();
3855 }
3856
3857 module_init(slgt_init);
3858 module_exit(slgt_exit);
3859
3860 /*
3861 * register access routines
3862 */
3863
3864 #define CALC_REGADDR() \
3865 unsigned long reg_addr = ((unsigned long)info->reg_addr) + addr; \
3866 if (addr >= 0x80) \
3867 reg_addr += (info->port_num) * 32; \
3868 else if (addr >= 0x40) \
3869 reg_addr += (info->port_num) * 16;
3870
3871 static __u8 rd_reg8(struct slgt_info *info, unsigned int addr)
3872 {
3873 CALC_REGADDR();
3874 return readb((void __iomem *)reg_addr);
3875 }
3876
3877 static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value)
3878 {
3879 CALC_REGADDR();
3880 writeb(value, (void __iomem *)reg_addr);
3881 }
3882
3883 static __u16 rd_reg16(struct slgt_info *info, unsigned int addr)
3884 {
3885 CALC_REGADDR();
3886 return readw((void __iomem *)reg_addr);
3887 }
3888
3889 static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value)
3890 {
3891 CALC_REGADDR();
3892 writew(value, (void __iomem *)reg_addr);
3893 }
3894
3895 static __u32 rd_reg32(struct slgt_info *info, unsigned int addr)
3896 {
3897 CALC_REGADDR();
3898 return readl((void __iomem *)reg_addr);
3899 }
3900
3901 static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value)
3902 {
3903 CALC_REGADDR();
3904 writel(value, (void __iomem *)reg_addr);
3905 }
3906
3907 static void rdma_reset(struct slgt_info *info)
3908 {
3909 unsigned int i;
3910
3911 /* set reset bit */
3912 wr_reg32(info, RDCSR, BIT1);
3913
3914 /* wait for enable bit cleared */
3915 for(i=0 ; i < 1000 ; i++)
3916 if (!(rd_reg32(info, RDCSR) & BIT0))
3917 break;
3918 }
3919
3920 static void tdma_reset(struct slgt_info *info)
3921 {
3922 unsigned int i;
3923
3924 /* set reset bit */
3925 wr_reg32(info, TDCSR, BIT1);
3926
3927 /* wait for enable bit cleared */
3928 for(i=0 ; i < 1000 ; i++)
3929 if (!(rd_reg32(info, TDCSR) & BIT0))
3930 break;
3931 }
3932
3933 /*
3934 * enable internal loopback
3935 * TxCLK and RxCLK are generated from BRG
3936 * and TxD is looped back to RxD internally.
3937 */
3938 static void enable_loopback(struct slgt_info *info)
3939 {
3940 /* SCR (serial control) BIT2=loopback enable */
3941 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT2));
3942
3943 if (info->params.mode != MGSL_MODE_ASYNC) {
3944 /* CCR (clock control)
3945 * 07..05 tx clock source (010 = BRG)
3946 * 04..02 rx clock source (010 = BRG)
3947 * 01 auxclk enable (0 = disable)
3948 * 00 BRG enable (1 = enable)
3949 *
3950 * 0100 1001
3951 */
3952 wr_reg8(info, CCR, 0x49);
3953
3954 /* set speed if available, otherwise use default */
3955 if (info->params.clock_speed)
3956 set_rate(info, info->params.clock_speed);
3957 else
3958 set_rate(info, 3686400);
3959 }
3960 }
3961
3962 /*
3963 * set baud rate generator to specified rate
3964 */
3965 static void set_rate(struct slgt_info *info, u32 rate)
3966 {
3967 unsigned int div;
3968 unsigned int osc = info->base_clock;
3969
3970 /* div = osc/rate - 1
3971 *
3972 * Round div up if osc/rate is not integer to
3973 * force to next slowest rate.
3974 */
3975
3976 if (rate) {
3977 div = osc/rate;
3978 if (!(osc % rate) && div)
3979 div--;
3980 wr_reg16(info, BDR, (unsigned short)div);
3981 }
3982 }
3983
3984 static void rx_stop(struct slgt_info *info)
3985 {
3986 unsigned short val;
3987
3988 /* disable and reset receiver */
3989 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
3990 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3991 wr_reg16(info, RCR, val); /* clear reset bit */
3992
3993 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA + IRQ_RXIDLE);
3994
3995 /* clear pending rx interrupts */
3996 wr_reg16(info, SSR, IRQ_RXIDLE + IRQ_RXOVER);
3997
3998 rdma_reset(info);
3999
4000 info->rx_enabled = false;
4001 info->rx_restart = false;
4002 }
4003
4004 static void rx_start(struct slgt_info *info)
4005 {
4006 unsigned short val;
4007
4008 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA);
4009
4010 /* clear pending rx overrun IRQ */
4011 wr_reg16(info, SSR, IRQ_RXOVER);
4012
4013 /* reset and disable receiver */
4014 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
4015 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
4016 wr_reg16(info, RCR, val); /* clear reset bit */
4017
4018 rdma_reset(info);
4019 reset_rbufs(info);
4020
4021 if (info->rx_pio) {
4022 /* rx request when rx FIFO not empty */
4023 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) & ~BIT14));
4024 slgt_irq_on(info, IRQ_RXDATA);
4025 if (info->params.mode == MGSL_MODE_ASYNC) {
4026 /* enable saving of rx status */
4027 wr_reg32(info, RDCSR, BIT6);
4028 }
4029 } else {
4030 /* rx request when rx FIFO half full */
4031 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT14));
4032 /* set 1st descriptor address */
4033 wr_reg32(info, RDDAR, info->rbufs[0].pdesc);
4034
4035 if (info->params.mode != MGSL_MODE_ASYNC) {
4036 /* enable rx DMA and DMA interrupt */
4037 wr_reg32(info, RDCSR, (BIT2 + BIT0));
4038 } else {
4039 /* enable saving of rx status, rx DMA and DMA interrupt */
4040 wr_reg32(info, RDCSR, (BIT6 + BIT2 + BIT0));
4041 }
4042 }
4043
4044 slgt_irq_on(info, IRQ_RXOVER);
4045
4046 /* enable receiver */
4047 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | BIT1));
4048
4049 info->rx_restart = false;
4050 info->rx_enabled = true;
4051 }
4052
4053 static void tx_start(struct slgt_info *info)
4054 {
4055 if (!info->tx_enabled) {
4056 wr_reg16(info, TCR,
4057 (unsigned short)((rd_reg16(info, TCR) | BIT1) & ~BIT2));
4058 info->tx_enabled = true;
4059 }
4060
4061 if (desc_count(info->tbufs[info->tbuf_start])) {
4062 info->drop_rts_on_tx_done = false;
4063
4064 if (info->params.mode != MGSL_MODE_ASYNC) {
4065 if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
4066 get_signals(info);
4067 if (!(info->signals & SerialSignal_RTS)) {
4068 info->signals |= SerialSignal_RTS;
4069 set_signals(info);
4070 info->drop_rts_on_tx_done = true;
4071 }
4072 }
4073
4074 slgt_irq_off(info, IRQ_TXDATA);
4075 slgt_irq_on(info, IRQ_TXUNDER + IRQ_TXIDLE);
4076 /* clear tx idle and underrun status bits */
4077 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
4078 } else {
4079 slgt_irq_off(info, IRQ_TXDATA);
4080 slgt_irq_on(info, IRQ_TXIDLE);
4081 /* clear tx idle status bit */
4082 wr_reg16(info, SSR, IRQ_TXIDLE);
4083 }
4084 /* set 1st descriptor address and start DMA */
4085 wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc);
4086 wr_reg32(info, TDCSR, BIT2 + BIT0);
4087 info->tx_active = true;
4088 }
4089 }
4090
4091 static void tx_stop(struct slgt_info *info)
4092 {
4093 unsigned short val;
4094
4095 del_timer(&info->tx_timer);
4096
4097 tdma_reset(info);
4098
4099 /* reset and disable transmitter */
4100 val = rd_reg16(info, TCR) & ~BIT1; /* clear enable bit */
4101 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
4102
4103 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
4104
4105 /* clear tx idle and underrun status bit */
4106 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
4107
4108 reset_tbufs(info);
4109
4110 info->tx_enabled = false;
4111 info->tx_active = false;
4112 }
4113
4114 static void reset_port(struct slgt_info *info)
4115 {
4116 if (!info->reg_addr)
4117 return;
4118
4119 tx_stop(info);
4120 rx_stop(info);
4121
4122 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
4123 set_signals(info);
4124
4125 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4126 }
4127
4128 static void reset_adapter(struct slgt_info *info)
4129 {
4130 int i;
4131 for (i=0; i < info->port_count; ++i) {
4132 if (info->port_array[i])
4133 reset_port(info->port_array[i]);
4134 }
4135 }
4136
4137 static void async_mode(struct slgt_info *info)
4138 {
4139 unsigned short val;
4140
4141 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4142 tx_stop(info);
4143 rx_stop(info);
4144
4145 /* TCR (tx control)
4146 *
4147 * 15..13 mode, 010=async
4148 * 12..10 encoding, 000=NRZ
4149 * 09 parity enable
4150 * 08 1=odd parity, 0=even parity
4151 * 07 1=RTS driver control
4152 * 06 1=break enable
4153 * 05..04 character length
4154 * 00=5 bits
4155 * 01=6 bits
4156 * 10=7 bits
4157 * 11=8 bits
4158 * 03 0=1 stop bit, 1=2 stop bits
4159 * 02 reset
4160 * 01 enable
4161 * 00 auto-CTS enable
4162 */
4163 val = 0x4000;
4164
4165 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4166 val |= BIT7;
4167
4168 if (info->params.parity != ASYNC_PARITY_NONE) {
4169 val |= BIT9;
4170 if (info->params.parity == ASYNC_PARITY_ODD)
4171 val |= BIT8;
4172 }
4173
4174 switch (info->params.data_bits)
4175 {
4176 case 6: val |= BIT4; break;
4177 case 7: val |= BIT5; break;
4178 case 8: val |= BIT5 + BIT4; break;
4179 }
4180
4181 if (info->params.stop_bits != 1)
4182 val |= BIT3;
4183
4184 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4185 val |= BIT0;
4186
4187 wr_reg16(info, TCR, val);
4188
4189 /* RCR (rx control)
4190 *
4191 * 15..13 mode, 010=async
4192 * 12..10 encoding, 000=NRZ
4193 * 09 parity enable
4194 * 08 1=odd parity, 0=even parity
4195 * 07..06 reserved, must be 0
4196 * 05..04 character length
4197 * 00=5 bits
4198 * 01=6 bits
4199 * 10=7 bits
4200 * 11=8 bits
4201 * 03 reserved, must be zero
4202 * 02 reset
4203 * 01 enable
4204 * 00 auto-DCD enable
4205 */
4206 val = 0x4000;
4207
4208 if (info->params.parity != ASYNC_PARITY_NONE) {
4209 val |= BIT9;
4210 if (info->params.parity == ASYNC_PARITY_ODD)
4211 val |= BIT8;
4212 }
4213
4214 switch (info->params.data_bits)
4215 {
4216 case 6: val |= BIT4; break;
4217 case 7: val |= BIT5; break;
4218 case 8: val |= BIT5 + BIT4; break;
4219 }
4220
4221 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4222 val |= BIT0;
4223
4224 wr_reg16(info, RCR, val);
4225
4226 /* CCR (clock control)
4227 *
4228 * 07..05 011 = tx clock source is BRG/16
4229 * 04..02 010 = rx clock source is BRG
4230 * 01 0 = auxclk disabled
4231 * 00 1 = BRG enabled
4232 *
4233 * 0110 1001
4234 */
4235 wr_reg8(info, CCR, 0x69);
4236
4237 msc_set_vcr(info);
4238
4239 /* SCR (serial control)
4240 *
4241 * 15 1=tx req on FIFO half empty
4242 * 14 1=rx req on FIFO half full
4243 * 13 tx data IRQ enable
4244 * 12 tx idle IRQ enable
4245 * 11 rx break on IRQ enable
4246 * 10 rx data IRQ enable
4247 * 09 rx break off IRQ enable
4248 * 08 overrun IRQ enable
4249 * 07 DSR IRQ enable
4250 * 06 CTS IRQ enable
4251 * 05 DCD IRQ enable
4252 * 04 RI IRQ enable
4253 * 03 0=16x sampling, 1=8x sampling
4254 * 02 1=txd->rxd internal loopback enable
4255 * 01 reserved, must be zero
4256 * 00 1=master IRQ enable
4257 */
4258 val = BIT15 + BIT14 + BIT0;
4259 /* JCR[8] : 1 = x8 async mode feature available */
4260 if ((rd_reg32(info, JCR) & BIT8) && info->params.data_rate &&
4261 ((info->base_clock < (info->params.data_rate * 16)) ||
4262 (info->base_clock % (info->params.data_rate * 16)))) {
4263 /* use 8x sampling */
4264 val |= BIT3;
4265 set_rate(info, info->params.data_rate * 8);
4266 } else {
4267 /* use 16x sampling */
4268 set_rate(info, info->params.data_rate * 16);
4269 }
4270 wr_reg16(info, SCR, val);
4271
4272 slgt_irq_on(info, IRQ_RXBREAK | IRQ_RXOVER);
4273
4274 if (info->params.loopback)
4275 enable_loopback(info);
4276 }
4277
4278 static void sync_mode(struct slgt_info *info)
4279 {
4280 unsigned short val;
4281
4282 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4283 tx_stop(info);
4284 rx_stop(info);
4285
4286 /* TCR (tx control)
4287 *
4288 * 15..13 mode
4289 * 000=HDLC/SDLC
4290 * 001=raw bit synchronous
4291 * 010=asynchronous/isochronous
4292 * 011=monosync byte synchronous
4293 * 100=bisync byte synchronous
4294 * 101=xsync byte synchronous
4295 * 12..10 encoding
4296 * 09 CRC enable
4297 * 08 CRC32
4298 * 07 1=RTS driver control
4299 * 06 preamble enable
4300 * 05..04 preamble length
4301 * 03 share open/close flag
4302 * 02 reset
4303 * 01 enable
4304 * 00 auto-CTS enable
4305 */
4306 val = BIT2;
4307
4308 switch(info->params.mode) {
4309 case MGSL_MODE_XSYNC:
4310 val |= BIT15 + BIT13;
4311 break;
4312 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4313 case MGSL_MODE_BISYNC: val |= BIT15; break;
4314 case MGSL_MODE_RAW: val |= BIT13; break;
4315 }
4316 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4317 val |= BIT7;
4318
4319 switch(info->params.encoding)
4320 {
4321 case HDLC_ENCODING_NRZB: val |= BIT10; break;
4322 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break;
4323 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break;
4324 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break;
4325 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4326 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4327 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4328 }
4329
4330 switch (info->params.crc_type & HDLC_CRC_MASK)
4331 {
4332 case HDLC_CRC_16_CCITT: val |= BIT9; break;
4333 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4334 }
4335
4336 if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
4337 val |= BIT6;
4338
4339 switch (info->params.preamble_length)
4340 {
4341 case HDLC_PREAMBLE_LENGTH_16BITS: val |= BIT5; break;
4342 case HDLC_PREAMBLE_LENGTH_32BITS: val |= BIT4; break;
4343 case HDLC_PREAMBLE_LENGTH_64BITS: val |= BIT5 + BIT4; break;
4344 }
4345
4346 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4347 val |= BIT0;
4348
4349 wr_reg16(info, TCR, val);
4350
4351 /* TPR (transmit preamble) */
4352
4353 switch (info->params.preamble)
4354 {
4355 case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
4356 case HDLC_PREAMBLE_PATTERN_ONES: val = 0xff; break;
4357 case HDLC_PREAMBLE_PATTERN_ZEROS: val = 0x00; break;
4358 case HDLC_PREAMBLE_PATTERN_10: val = 0x55; break;
4359 case HDLC_PREAMBLE_PATTERN_01: val = 0xaa; break;
4360 default: val = 0x7e; break;
4361 }
4362 wr_reg8(info, TPR, (unsigned char)val);
4363
4364 /* RCR (rx control)
4365 *
4366 * 15..13 mode
4367 * 000=HDLC/SDLC
4368 * 001=raw bit synchronous
4369 * 010=asynchronous/isochronous
4370 * 011=monosync byte synchronous
4371 * 100=bisync byte synchronous
4372 * 101=xsync byte synchronous
4373 * 12..10 encoding
4374 * 09 CRC enable
4375 * 08 CRC32
4376 * 07..03 reserved, must be 0
4377 * 02 reset
4378 * 01 enable
4379 * 00 auto-DCD enable
4380 */
4381 val = 0;
4382
4383 switch(info->params.mode) {
4384 case MGSL_MODE_XSYNC:
4385 val |= BIT15 + BIT13;
4386 break;
4387 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4388 case MGSL_MODE_BISYNC: val |= BIT15; break;
4389 case MGSL_MODE_RAW: val |= BIT13; break;
4390 }
4391
4392 switch(info->params.encoding)
4393 {
4394 case HDLC_ENCODING_NRZB: val |= BIT10; break;
4395 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break;
4396 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break;
4397 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break;
4398 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4399 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4400 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4401 }
4402
4403 switch (info->params.crc_type & HDLC_CRC_MASK)
4404 {
4405 case HDLC_CRC_16_CCITT: val |= BIT9; break;
4406 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4407 }
4408
4409 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4410 val |= BIT0;
4411
4412 wr_reg16(info, RCR, val);
4413
4414 /* CCR (clock control)
4415 *
4416 * 07..05 tx clock source
4417 * 04..02 rx clock source
4418 * 01 auxclk enable
4419 * 00 BRG enable
4420 */
4421 val = 0;
4422
4423 if (info->params.flags & HDLC_FLAG_TXC_BRG)
4424 {
4425 // when RxC source is DPLL, BRG generates 16X DPLL
4426 // reference clock, so take TxC from BRG/16 to get
4427 // transmit clock at actual data rate
4428 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4429 val |= BIT6 + BIT5; /* 011, txclk = BRG/16 */
4430 else
4431 val |= BIT6; /* 010, txclk = BRG */
4432 }
4433 else if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4434 val |= BIT7; /* 100, txclk = DPLL Input */
4435 else if (info->params.flags & HDLC_FLAG_TXC_RXCPIN)
4436 val |= BIT5; /* 001, txclk = RXC Input */
4437
4438 if (info->params.flags & HDLC_FLAG_RXC_BRG)
4439 val |= BIT3; /* 010, rxclk = BRG */
4440 else if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4441 val |= BIT4; /* 100, rxclk = DPLL */
4442 else if (info->params.flags & HDLC_FLAG_RXC_TXCPIN)
4443 val |= BIT2; /* 001, rxclk = TXC Input */
4444
4445 if (info->params.clock_speed)
4446 val |= BIT1 + BIT0;
4447
4448 wr_reg8(info, CCR, (unsigned char)val);
4449
4450 if (info->params.flags & (HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL))
4451 {
4452 // program DPLL mode
4453 switch(info->params.encoding)
4454 {
4455 case HDLC_ENCODING_BIPHASE_MARK:
4456 case HDLC_ENCODING_BIPHASE_SPACE:
4457 val = BIT7; break;
4458 case HDLC_ENCODING_BIPHASE_LEVEL:
4459 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:
4460 val = BIT7 + BIT6; break;
4461 default: val = BIT6; // NRZ encodings
4462 }
4463 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | val));
4464
4465 // DPLL requires a 16X reference clock from BRG
4466 set_rate(info, info->params.clock_speed * 16);
4467 }
4468 else
4469 set_rate(info, info->params.clock_speed);
4470
4471 tx_set_idle(info);
4472
4473 msc_set_vcr(info);
4474
4475 /* SCR (serial control)
4476 *
4477 * 15 1=tx req on FIFO half empty
4478 * 14 1=rx req on FIFO half full
4479 * 13 tx data IRQ enable
4480 * 12 tx idle IRQ enable
4481 * 11 underrun IRQ enable
4482 * 10 rx data IRQ enable
4483 * 09 rx idle IRQ enable
4484 * 08 overrun IRQ enable
4485 * 07 DSR IRQ enable
4486 * 06 CTS IRQ enable
4487 * 05 DCD IRQ enable
4488 * 04 RI IRQ enable
4489 * 03 reserved, must be zero
4490 * 02 1=txd->rxd internal loopback enable
4491 * 01 reserved, must be zero
4492 * 00 1=master IRQ enable
4493 */
4494 wr_reg16(info, SCR, BIT15 + BIT14 + BIT0);
4495
4496 if (info->params.loopback)
4497 enable_loopback(info);
4498 }
4499
4500 /*
4501 * set transmit idle mode
4502 */
4503 static void tx_set_idle(struct slgt_info *info)
4504 {
4505 unsigned char val;
4506 unsigned short tcr;
4507
4508 /* if preamble enabled (tcr[6] == 1) then tx idle size = 8 bits
4509 * else tcr[5:4] = tx idle size: 00 = 8 bits, 01 = 16 bits
4510 */
4511 tcr = rd_reg16(info, TCR);
4512 if (info->idle_mode & HDLC_TXIDLE_CUSTOM_16) {
4513 /* disable preamble, set idle size to 16 bits */
4514 tcr = (tcr & ~(BIT6 + BIT5)) | BIT4;
4515 /* MSB of 16 bit idle specified in tx preamble register (TPR) */
4516 wr_reg8(info, TPR, (unsigned char)((info->idle_mode >> 8) & 0xff));
4517 } else if (!(tcr & BIT6)) {
4518 /* preamble is disabled, set idle size to 8 bits */
4519 tcr &= ~(BIT5 + BIT4);
4520 }
4521 wr_reg16(info, TCR, tcr);
4522
4523 if (info->idle_mode & (HDLC_TXIDLE_CUSTOM_8 | HDLC_TXIDLE_CUSTOM_16)) {
4524 /* LSB of custom tx idle specified in tx idle register */
4525 val = (unsigned char)(info->idle_mode & 0xff);
4526 } else {
4527 /* standard 8 bit idle patterns */
4528 switch(info->idle_mode)
4529 {
4530 case HDLC_TXIDLE_FLAGS: val = 0x7e; break;
4531 case HDLC_TXIDLE_ALT_ZEROS_ONES:
4532 case HDLC_TXIDLE_ALT_MARK_SPACE: val = 0xaa; break;
4533 case HDLC_TXIDLE_ZEROS:
4534 case HDLC_TXIDLE_SPACE: val = 0x00; break;
4535 default: val = 0xff;
4536 }
4537 }
4538
4539 wr_reg8(info, TIR, val);
4540 }
4541
4542 /*
4543 * get state of V24 status (input) signals
4544 */
4545 static void get_signals(struct slgt_info *info)
4546 {
4547 unsigned short status = rd_reg16(info, SSR);
4548
4549 /* clear all serial signals except RTS and DTR */
4550 info->signals &= SerialSignal_RTS | SerialSignal_DTR;
4551
4552 if (status & BIT3)
4553 info->signals |= SerialSignal_DSR;
4554 if (status & BIT2)
4555 info->signals |= SerialSignal_CTS;
4556 if (status & BIT1)
4557 info->signals |= SerialSignal_DCD;
4558 if (status & BIT0)
4559 info->signals |= SerialSignal_RI;
4560 }
4561
4562 /*
4563 * set V.24 Control Register based on current configuration
4564 */
4565 static void msc_set_vcr(struct slgt_info *info)
4566 {
4567 unsigned char val = 0;
4568
4569 /* VCR (V.24 control)
4570 *
4571 * 07..04 serial IF select
4572 * 03 DTR
4573 * 02 RTS
4574 * 01 LL
4575 * 00 RL
4576 */
4577
4578 switch(info->if_mode & MGSL_INTERFACE_MASK)
4579 {
4580 case MGSL_INTERFACE_RS232:
4581 val |= BIT5; /* 0010 */
4582 break;
4583 case MGSL_INTERFACE_V35:
4584 val |= BIT7 + BIT6 + BIT5; /* 1110 */
4585 break;
4586 case MGSL_INTERFACE_RS422:
4587 val |= BIT6; /* 0100 */
4588 break;
4589 }
4590
4591 if (info->if_mode & MGSL_INTERFACE_MSB_FIRST)
4592 val |= BIT4;
4593 if (info->signals & SerialSignal_DTR)
4594 val |= BIT3;
4595 if (info->signals & SerialSignal_RTS)
4596 val |= BIT2;
4597 if (info->if_mode & MGSL_INTERFACE_LL)
4598 val |= BIT1;
4599 if (info->if_mode & MGSL_INTERFACE_RL)
4600 val |= BIT0;
4601 wr_reg8(info, VCR, val);
4602 }
4603
4604 /*
4605 * set state of V24 control (output) signals
4606 */
4607 static void set_signals(struct slgt_info *info)
4608 {
4609 unsigned char val = rd_reg8(info, VCR);
4610 if (info->signals & SerialSignal_DTR)
4611 val |= BIT3;
4612 else
4613 val &= ~BIT3;
4614 if (info->signals & SerialSignal_RTS)
4615 val |= BIT2;
4616 else
4617 val &= ~BIT2;
4618 wr_reg8(info, VCR, val);
4619 }
4620
4621 /*
4622 * free range of receive DMA buffers (i to last)
4623 */
4624 static void free_rbufs(struct slgt_info *info, unsigned int i, unsigned int last)
4625 {
4626 int done = 0;
4627
4628 while(!done) {
4629 /* reset current buffer for reuse */
4630 info->rbufs[i].status = 0;
4631 set_desc_count(info->rbufs[i], info->rbuf_fill_level);
4632 if (i == last)
4633 done = 1;
4634 if (++i == info->rbuf_count)
4635 i = 0;
4636 }
4637 info->rbuf_current = i;
4638 }
4639
4640 /*
4641 * mark all receive DMA buffers as free
4642 */
4643 static void reset_rbufs(struct slgt_info *info)
4644 {
4645 free_rbufs(info, 0, info->rbuf_count - 1);
4646 info->rbuf_fill_index = 0;
4647 info->rbuf_fill_count = 0;
4648 }
4649
4650 /*
4651 * pass receive HDLC frame to upper layer
4652 *
4653 * return true if frame available, otherwise false
4654 */
4655 static bool rx_get_frame(struct slgt_info *info)
4656 {
4657 unsigned int start, end;
4658 unsigned short status;
4659 unsigned int framesize = 0;
4660 unsigned long flags;
4661 struct tty_struct *tty = info->port.tty;
4662 unsigned char addr_field = 0xff;
4663 unsigned int crc_size = 0;
4664
4665 switch (info->params.crc_type & HDLC_CRC_MASK) {
4666 case HDLC_CRC_16_CCITT: crc_size = 2; break;
4667 case HDLC_CRC_32_CCITT: crc_size = 4; break;
4668 }
4669
4670 check_again:
4671
4672 framesize = 0;
4673 addr_field = 0xff;
4674 start = end = info->rbuf_current;
4675
4676 for (;;) {
4677 if (!desc_complete(info->rbufs[end]))
4678 goto cleanup;
4679
4680 if (framesize == 0 && info->params.addr_filter != 0xff)
4681 addr_field = info->rbufs[end].buf[0];
4682
4683 framesize += desc_count(info->rbufs[end]);
4684
4685 if (desc_eof(info->rbufs[end]))
4686 break;
4687
4688 if (++end == info->rbuf_count)
4689 end = 0;
4690
4691 if (end == info->rbuf_current) {
4692 if (info->rx_enabled){
4693 spin_lock_irqsave(&info->lock,flags);
4694 rx_start(info);
4695 spin_unlock_irqrestore(&info->lock,flags);
4696 }
4697 goto cleanup;
4698 }
4699 }
4700
4701 /* status
4702 *
4703 * 15 buffer complete
4704 * 14..06 reserved
4705 * 05..04 residue
4706 * 02 eof (end of frame)
4707 * 01 CRC error
4708 * 00 abort
4709 */
4710 status = desc_status(info->rbufs[end]);
4711
4712 /* ignore CRC bit if not using CRC (bit is undefined) */
4713 if ((info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_NONE)
4714 status &= ~BIT1;
4715
4716 if (framesize == 0 ||
4717 (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4718 free_rbufs(info, start, end);
4719 goto check_again;
4720 }
4721
4722 if (framesize < (2 + crc_size) || status & BIT0) {
4723 info->icount.rxshort++;
4724 framesize = 0;
4725 } else if (status & BIT1) {
4726 info->icount.rxcrc++;
4727 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX))
4728 framesize = 0;
4729 }
4730
4731 #if SYNCLINK_GENERIC_HDLC
4732 if (framesize == 0) {
4733 info->netdev->stats.rx_errors++;
4734 info->netdev->stats.rx_frame_errors++;
4735 }
4736 #endif
4737
4738 DBGBH(("%s rx frame status=%04X size=%d\n",
4739 info->device_name, status, framesize));
4740 DBGDATA(info, info->rbufs[start].buf, min_t(int, framesize, info->rbuf_fill_level), "rx");
4741
4742 if (framesize) {
4743 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) {
4744 framesize -= crc_size;
4745 crc_size = 0;
4746 }
4747
4748 if (framesize > info->max_frame_size + crc_size)
4749 info->icount.rxlong++;
4750 else {
4751 /* copy dma buffer(s) to contiguous temp buffer */
4752 int copy_count = framesize;
4753 int i = start;
4754 unsigned char *p = info->tmp_rbuf;
4755 info->tmp_rbuf_count = framesize;
4756
4757 info->icount.rxok++;
4758
4759 while(copy_count) {
4760 int partial_count = min_t(int, copy_count, info->rbuf_fill_level);
4761 memcpy(p, info->rbufs[i].buf, partial_count);
4762 p += partial_count;
4763 copy_count -= partial_count;
4764 if (++i == info->rbuf_count)
4765 i = 0;
4766 }
4767
4768 if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
4769 *p = (status & BIT1) ? RX_CRC_ERROR : RX_OK;
4770 framesize++;
4771 }
4772
4773 #if SYNCLINK_GENERIC_HDLC
4774 if (info->netcount)
4775 hdlcdev_rx(info,info->tmp_rbuf, framesize);
4776 else
4777 #endif
4778 ldisc_receive_buf(tty, info->tmp_rbuf, info->flag_buf, framesize);
4779 }
4780 }
4781 free_rbufs(info, start, end);
4782 return true;
4783
4784 cleanup:
4785 return false;
4786 }
4787
4788 /*
4789 * pass receive buffer (RAW synchronous mode) to tty layer
4790 * return true if buffer available, otherwise false
4791 */
4792 static bool rx_get_buf(struct slgt_info *info)
4793 {
4794 unsigned int i = info->rbuf_current;
4795 unsigned int count;
4796
4797 if (!desc_complete(info->rbufs[i]))
4798 return false;
4799 count = desc_count(info->rbufs[i]);
4800 switch(info->params.mode) {
4801 case MGSL_MODE_MONOSYNC:
4802 case MGSL_MODE_BISYNC:
4803 case MGSL_MODE_XSYNC:
4804 /* ignore residue in byte synchronous modes */
4805 if (desc_residue(info->rbufs[i]))
4806 count--;
4807 break;
4808 }
4809 DBGDATA(info, info->rbufs[i].buf, count, "rx");
4810 DBGINFO(("rx_get_buf size=%d\n", count));
4811 if (count)
4812 ldisc_receive_buf(info->port.tty, info->rbufs[i].buf,
4813 info->flag_buf, count);
4814 free_rbufs(info, i, i);
4815 return true;
4816 }
4817
4818 static void reset_tbufs(struct slgt_info *info)
4819 {
4820 unsigned int i;
4821 info->tbuf_current = 0;
4822 for (i=0 ; i < info->tbuf_count ; i++) {
4823 info->tbufs[i].status = 0;
4824 info->tbufs[i].count = 0;
4825 }
4826 }
4827
4828 /*
4829 * return number of free transmit DMA buffers
4830 */
4831 static unsigned int free_tbuf_count(struct slgt_info *info)
4832 {
4833 unsigned int count = 0;
4834 unsigned int i = info->tbuf_current;
4835
4836 do
4837 {
4838 if (desc_count(info->tbufs[i]))
4839 break; /* buffer in use */
4840 ++count;
4841 if (++i == info->tbuf_count)
4842 i=0;
4843 } while (i != info->tbuf_current);
4844
4845 /* if tx DMA active, last zero count buffer is in use */
4846 if (count && (rd_reg32(info, TDCSR) & BIT0))
4847 --count;
4848
4849 return count;
4850 }
4851
4852 /*
4853 * return number of bytes in unsent transmit DMA buffers
4854 * and the serial controller tx FIFO
4855 */
4856 static unsigned int tbuf_bytes(struct slgt_info *info)
4857 {
4858 unsigned int total_count = 0;
4859 unsigned int i = info->tbuf_current;
4860 unsigned int reg_value;
4861 unsigned int count;
4862 unsigned int active_buf_count = 0;
4863
4864 /*
4865 * Add descriptor counts for all tx DMA buffers.
4866 * If count is zero (cleared by DMA controller after read),
4867 * the buffer is complete or is actively being read from.
4868 *
4869 * Record buf_count of last buffer with zero count starting
4870 * from current ring position. buf_count is mirror
4871 * copy of count and is not cleared by serial controller.
4872 * If DMA controller is active, that buffer is actively
4873 * being read so add to total.
4874 */
4875 do {
4876 count = desc_count(info->tbufs[i]);
4877 if (count)
4878 total_count += count;
4879 else if (!total_count)
4880 active_buf_count = info->tbufs[i].buf_count;
4881 if (++i == info->tbuf_count)
4882 i = 0;
4883 } while (i != info->tbuf_current);
4884
4885 /* read tx DMA status register */
4886 reg_value = rd_reg32(info, TDCSR);
4887
4888 /* if tx DMA active, last zero count buffer is in use */
4889 if (reg_value & BIT0)
4890 total_count += active_buf_count;
4891
4892 /* add tx FIFO count = reg_value[15..8] */
4893 total_count += (reg_value >> 8) & 0xff;
4894
4895 /* if transmitter active add one byte for shift register */
4896 if (info->tx_active)
4897 total_count++;
4898
4899 return total_count;
4900 }
4901
4902 /*
4903 * load data into transmit DMA buffer ring and start transmitter if needed
4904 * return true if data accepted, otherwise false (buffers full)
4905 */
4906 static bool tx_load(struct slgt_info *info, const char *buf, unsigned int size)
4907 {
4908 unsigned short count;
4909 unsigned int i;
4910 struct slgt_desc *d;
4911
4912 /* check required buffer space */
4913 if (DIV_ROUND_UP(size, DMABUFSIZE) > free_tbuf_count(info))
4914 return false;
4915
4916 DBGDATA(info, buf, size, "tx");
4917
4918 /*
4919 * copy data to one or more DMA buffers in circular ring
4920 * tbuf_start = first buffer for this data
4921 * tbuf_current = next free buffer
4922 *
4923 * Copy all data before making data visible to DMA controller by
4924 * setting descriptor count of the first buffer.
4925 * This prevents an active DMA controller from reading the first DMA
4926 * buffers of a frame and stopping before the final buffers are filled.
4927 */
4928
4929 info->tbuf_start = i = info->tbuf_current;
4930
4931 while (size) {
4932 d = &info->tbufs[i];
4933
4934 count = (unsigned short)((size > DMABUFSIZE) ? DMABUFSIZE : size);
4935 memcpy(d->buf, buf, count);
4936
4937 size -= count;
4938 buf += count;
4939
4940 /*
4941 * set EOF bit for last buffer of HDLC frame or
4942 * for every buffer in raw mode
4943 */
4944 if ((!size && info->params.mode == MGSL_MODE_HDLC) ||
4945 info->params.mode == MGSL_MODE_RAW)
4946 set_desc_eof(*d, 1);
4947 else
4948 set_desc_eof(*d, 0);
4949
4950 /* set descriptor count for all but first buffer */
4951 if (i != info->tbuf_start)
4952 set_desc_count(*d, count);
4953 d->buf_count = count;
4954
4955 if (++i == info->tbuf_count)
4956 i = 0;
4957 }
4958
4959 info->tbuf_current = i;
4960
4961 /* set first buffer count to make new data visible to DMA controller */
4962 d = &info->tbufs[info->tbuf_start];
4963 set_desc_count(*d, d->buf_count);
4964
4965 /* start transmitter if needed and update transmit timeout */
4966 if (!info->tx_active)
4967 tx_start(info);
4968 update_tx_timer(info);
4969
4970 return true;
4971 }
4972
4973 static int register_test(struct slgt_info *info)
4974 {
4975 static unsigned short patterns[] =
4976 {0x0000, 0xffff, 0xaaaa, 0x5555, 0x6969, 0x9696};
4977 static unsigned int count = ARRAY_SIZE(patterns);
4978 unsigned int i;
4979 int rc = 0;
4980
4981 for (i=0 ; i < count ; i++) {
4982 wr_reg16(info, TIR, patterns[i]);
4983 wr_reg16(info, BDR, patterns[(i+1)%count]);
4984 if ((rd_reg16(info, TIR) != patterns[i]) ||
4985 (rd_reg16(info, BDR) != patterns[(i+1)%count])) {
4986 rc = -ENODEV;
4987 break;
4988 }
4989 }
4990 info->gpio_present = (rd_reg32(info, JCR) & BIT5) ? 1 : 0;
4991 info->init_error = rc ? 0 : DiagStatus_AddressFailure;
4992 return rc;
4993 }
4994
4995 static int irq_test(struct slgt_info *info)
4996 {
4997 unsigned long timeout;
4998 unsigned long flags;
4999 struct tty_struct *oldtty = info->port.tty;
5000 u32 speed = info->params.data_rate;
5001
5002 info->params.data_rate = 921600;
5003 info->port.tty = NULL;
5004
5005 spin_lock_irqsave(&info->lock, flags);
5006 async_mode(info);
5007 slgt_irq_on(info, IRQ_TXIDLE);
5008
5009 /* enable transmitter */
5010 wr_reg16(info, TCR,
5011 (unsigned short)(rd_reg16(info, TCR) | BIT1));
5012
5013 /* write one byte and wait for tx idle */
5014 wr_reg16(info, TDR, 0);
5015
5016 /* assume failure */
5017 info->init_error = DiagStatus_IrqFailure;
5018 info->irq_occurred = false;
5019
5020 spin_unlock_irqrestore(&info->lock, flags);
5021
5022 timeout=100;
5023 while(timeout-- && !info->irq_occurred)
5024 msleep_interruptible(10);
5025
5026 spin_lock_irqsave(&info->lock,flags);
5027 reset_port(info);
5028 spin_unlock_irqrestore(&info->lock,flags);
5029
5030 info->params.data_rate = speed;
5031 info->port.tty = oldtty;
5032
5033 info->init_error = info->irq_occurred ? 0 : DiagStatus_IrqFailure;
5034 return info->irq_occurred ? 0 : -ENODEV;
5035 }
5036
5037 static int loopback_test_rx(struct slgt_info *info)
5038 {
5039 unsigned char *src, *dest;
5040 int count;
5041
5042 if (desc_complete(info->rbufs[0])) {
5043 count = desc_count(info->rbufs[0]);
5044 src = info->rbufs[0].buf;
5045 dest = info->tmp_rbuf;
5046
5047 for( ; count ; count-=2, src+=2) {
5048 /* src=data byte (src+1)=status byte */
5049 if (!(*(src+1) & (BIT9 + BIT8))) {
5050 *dest = *src;
5051 dest++;
5052 info->tmp_rbuf_count++;
5053 }
5054 }
5055 DBGDATA(info, info->tmp_rbuf, info->tmp_rbuf_count, "rx");
5056 return 1;
5057 }
5058 return 0;
5059 }
5060
5061 static int loopback_test(struct slgt_info *info)
5062 {
5063 #define TESTFRAMESIZE 20
5064
5065 unsigned long timeout;
5066 u16 count = TESTFRAMESIZE;
5067 unsigned char buf[TESTFRAMESIZE];
5068 int rc = -ENODEV;
5069 unsigned long flags;
5070
5071 struct tty_struct *oldtty = info->port.tty;
5072 MGSL_PARAMS params;
5073
5074 memcpy(&params, &info->params, sizeof(params));
5075
5076 info->params.mode = MGSL_MODE_ASYNC;
5077 info->params.data_rate = 921600;
5078 info->params.loopback = 1;
5079 info->port.tty = NULL;
5080
5081 /* build and send transmit frame */
5082 for (count = 0; count < TESTFRAMESIZE; ++count)
5083 buf[count] = (unsigned char)count;
5084
5085 info->tmp_rbuf_count = 0;
5086 memset(info->tmp_rbuf, 0, TESTFRAMESIZE);
5087
5088 /* program hardware for HDLC and enabled receiver */
5089 spin_lock_irqsave(&info->lock,flags);
5090 async_mode(info);
5091 rx_start(info);
5092 tx_load(info, buf, count);
5093 spin_unlock_irqrestore(&info->lock, flags);
5094
5095 /* wait for receive complete */
5096 for (timeout = 100; timeout; --timeout) {
5097 msleep_interruptible(10);
5098 if (loopback_test_rx(info)) {
5099 rc = 0;
5100 break;
5101 }
5102 }
5103
5104 /* verify received frame length and contents */
5105 if (!rc && (info->tmp_rbuf_count != count ||
5106 memcmp(buf, info->tmp_rbuf, count))) {
5107 rc = -ENODEV;
5108 }
5109
5110 spin_lock_irqsave(&info->lock,flags);
5111 reset_adapter(info);
5112 spin_unlock_irqrestore(&info->lock,flags);
5113
5114 memcpy(&info->params, &params, sizeof(info->params));
5115 info->port.tty = oldtty;
5116
5117 info->init_error = rc ? DiagStatus_DmaFailure : 0;
5118 return rc;
5119 }
5120
5121 static int adapter_test(struct slgt_info *info)
5122 {
5123 DBGINFO(("testing %s\n", info->device_name));
5124 if (register_test(info) < 0) {
5125 printk("register test failure %s addr=%08X\n",
5126 info->device_name, info->phys_reg_addr);
5127 } else if (irq_test(info) < 0) {
5128 printk("IRQ test failure %s IRQ=%d\n",
5129 info->device_name, info->irq_level);
5130 } else if (loopback_test(info) < 0) {
5131 printk("loopback test failure %s\n", info->device_name);
5132 }
5133 return info->init_error;
5134 }
5135
5136 /*
5137 * transmit timeout handler
5138 */
5139 static void tx_timeout(unsigned long context)
5140 {
5141 struct slgt_info *info = (struct slgt_info*)context;
5142 unsigned long flags;
5143
5144 DBGINFO(("%s tx_timeout\n", info->device_name));
5145 if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5146 info->icount.txtimeout++;
5147 }
5148 spin_lock_irqsave(&info->lock,flags);
5149 tx_stop(info);
5150 spin_unlock_irqrestore(&info->lock,flags);
5151
5152 #if SYNCLINK_GENERIC_HDLC
5153 if (info->netcount)
5154 hdlcdev_tx_done(info);
5155 else
5156 #endif
5157 bh_transmit(info);
5158 }
5159
5160 /*
5161 * receive buffer polling timer
5162 */
5163 static void rx_timeout(unsigned long context)
5164 {
5165 struct slgt_info *info = (struct slgt_info*)context;
5166 unsigned long flags;
5167
5168 DBGINFO(("%s rx_timeout\n", info->device_name));
5169 spin_lock_irqsave(&info->lock, flags);
5170 info->pending_bh |= BH_RECEIVE;
5171 spin_unlock_irqrestore(&info->lock, flags);
5172 bh_handler(&info->task);
5173 }
5174
Linux with added FPC-III support