?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
mpls_iptunnel: fix sparse warn: remove incorrect rcu_dereference
[linux/fpc-iii.git] / drivers / net / wan / dscc4.c
blob7a72407208b161772ba66dc284c7701ea5a85f59
1 /*
2 * drivers/net/wan/dscc4/dscc4.c: a DSCC4 HDLC driver for Linux
3 *
4 * This software may be used and distributed according to the terms of the
5 * GNU General Public License.
6 *
7 * The author may be reached as romieu@cogenit.fr.
8 * Specific bug reports/asian food will be welcome.
9 *
10 * Special thanks to the nice people at CS-Telecom for the hardware and the
11 * access to the test/measure tools.
12 *
13 *
14 * Theory of Operation
15 *
16 * I. Board Compatibility
17 *
18 * This device driver is designed for the Siemens PEB20534 4 ports serial
19 * controller as found on Etinc PCISYNC cards. The documentation for the
20 * chipset is available at http://www.infineon.com:
21 * - Data Sheet "DSCC4, DMA Supported Serial Communication Controller with
22 * 4 Channels, PEB 20534 Version 2.1, PEF 20534 Version 2.1";
23 * - Application Hint "Management of DSCC4 on-chip FIFO resources".
24 * - Errata sheet DS5 (courtesy of Michael Skerritt).
25 * Jens David has built an adapter based on the same chipset. Take a look
26 * at http://www.afthd.tu-darmstadt.de/~dg1kjd/pciscc4 for a specific
27 * driver.
28 * Sample code (2 revisions) is available at Infineon.
29 *
30 * II. Board-specific settings
31 *
32 * Pcisync can transmit some clock signal to the outside world on the
33 * *first two* ports provided you put a quartz and a line driver on it and
34 * remove the jumpers. The operation is described on Etinc web site. If you
35 * go DCE on these ports, don't forget to use an adequate cable.
36 *
37 * Sharing of the PCI interrupt line for this board is possible.
38 *
39 * III. Driver operation
40 *
41 * The rx/tx operations are based on a linked list of descriptors. The driver
42 * doesn't use HOLD mode any more. HOLD mode is definitely buggy and the more
43 * I tried to fix it, the more it started to look like (convoluted) software
44 * mutation of LxDA method. Errata sheet DS5 suggests to use LxDA: consider
45 * this a rfc2119 MUST.
46 *
47 * Tx direction
48 * When the tx ring is full, the xmit routine issues a call to netdev_stop.
49 * The device is supposed to be enabled again during an ALLS irq (we could
50 * use HI but as it's easy to lose events, it's fscked).
51 *
52 * Rx direction
53 * The received frames aren't supposed to span over multiple receiving areas.
54 * I may implement it some day but it isn't the highest ranked item.
55 *
56 * IV. Notes
57 * The current error (XDU, RFO) recovery code is untested.
58 * So far, RDO takes his RX channel down and the right sequence to enable it
59 * again is still a mystery. If RDO happens, plan a reboot. More details
60 * in the code (NB: as this happens, TX still works).
61 * Don't mess the cables during operation, especially on DTE ports. I don't
62 * suggest it for DCE either but at least one can get some messages instead
63 * of a complete instant freeze.
64 * Tests are done on Rev. 20 of the silicium. The RDO handling changes with
65 * the documentation/chipset releases.
66 *
67 * TODO:
68 * - test X25.
69 * - use polling at high irq/s,
70 * - performance analysis,
71 * - endianness.
72 *
73 * 2001/12/10 Daniela Squassoni <daniela@cyclades.com>
74 * - Contribution to support the new generic HDLC layer.
75 *
76 * 2002/01 Ueimor
77 * - old style interface removal
78 * - dscc4_release_ring fix (related to DMA mapping)
79 * - hard_start_xmit fix (hint: TxSizeMax)
80 * - misc crapectomy.
81 */
82
83 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
84
85 #include <linux/module.h>
86 #include <linux/sched.h>
87 #include <linux/types.h>
88 #include <linux/errno.h>
89 #include <linux/list.h>
90 #include <linux/ioport.h>
91 #include <linux/pci.h>
92 #include <linux/kernel.h>
93 #include <linux/mm.h>
94 #include <linux/slab.h>
95
96 #include <asm/cache.h>
97 #include <asm/byteorder.h>
98 #include <asm/uaccess.h>
99 #include <asm/io.h>
100 #include <asm/irq.h>
101
102 #include <linux/init.h>
103 #include <linux/interrupt.h>
104 #include <linux/string.h>
105
106 #include <linux/if_arp.h>
107 #include <linux/netdevice.h>
108 #include <linux/skbuff.h>
109 #include <linux/delay.h>
110 #include <linux/hdlc.h>
111 #include <linux/mutex.h>
112
113 /* Version */
114 static const char version[] = "$Id: dscc4.c,v 1.173 2003/09/20 23:55:34 romieu Exp $ for Linux\n";
115 static int debug;
116 static int quartz;
117
118 #ifdef CONFIG_DSCC4_PCI_RST
119 static DEFINE_MUTEX(dscc4_mutex);
120 static u32 dscc4_pci_config_store[16];
121 #endif
122
123 #define DRV_NAME "dscc4"
124
125 #undef DSCC4_POLLING
126
127 /* Module parameters */
128
129 MODULE_AUTHOR("Maintainer: Francois Romieu <romieu@cogenit.fr>");
130 MODULE_DESCRIPTION("Siemens PEB20534 PCI Controller");
131 MODULE_LICENSE("GPL");
132 module_param(debug, int, 0);
133 MODULE_PARM_DESC(debug,"Enable/disable extra messages");
134 module_param(quartz, int, 0);
135 MODULE_PARM_DESC(quartz,"If present, on-board quartz frequency (Hz)");
136
137 /* Structures */
138
139 struct thingie {
140 int define;
141 u32 bits;
142 };
143
144 struct TxFD {
145 __le32 state;
146 __le32 next;
147 __le32 data;
148 __le32 complete;
149 u32 jiffies; /* Allows sizeof(TxFD) == sizeof(RxFD) + extra hack */
150 /* FWIW, datasheet calls that "dummy" and says that card
151 * never looks at it; neither does the driver */
152 };
153
154 struct RxFD {
155 __le32 state1;
156 __le32 next;
157 __le32 data;
158 __le32 state2;
159 __le32 end;
160 };
161
162 #define DUMMY_SKB_SIZE 64
163 #define TX_LOW 8
164 #define TX_RING_SIZE 32
165 #define RX_RING_SIZE 32
166 #define TX_TOTAL_SIZE TX_RING_SIZE*sizeof(struct TxFD)
167 #define RX_TOTAL_SIZE RX_RING_SIZE*sizeof(struct RxFD)
168 #define IRQ_RING_SIZE 64 /* Keep it a multiple of 32 */
169 #define TX_TIMEOUT (HZ/10)
170 #define DSCC4_HZ_MAX 33000000
171 #define BRR_DIVIDER_MAX 64*0x00004000 /* Cf errata DS5 p.10 */
172 #define dev_per_card 4
173 #define SCC_REGISTERS_MAX 23 /* Cf errata DS5 p.4 */
174
175 #define SOURCE_ID(flags) (((flags) >> 28) & 0x03)
176 #define TO_SIZE(state) (((state) >> 16) & 0x1fff)
177
178 /*
179 * Given the operating range of Linux HDLC, the 2 defines below could be
180 * made simpler. However they are a fine reminder for the limitations of
181 * the driver: it's better to stay < TxSizeMax and < RxSizeMax.
182 */
183 #define TO_STATE_TX(len) cpu_to_le32(((len) & TxSizeMax) << 16)
184 #define TO_STATE_RX(len) cpu_to_le32((RX_MAX(len) % RxSizeMax) << 16)
185 #define RX_MAX(len) ((((len) >> 5) + 1) << 5) /* Cf RLCR */
186 #define SCC_REG_START(dpriv) (SCC_START+(dpriv->dev_id)*SCC_OFFSET)
187
188 struct dscc4_pci_priv {
189 __le32 *iqcfg;
190 int cfg_cur;
191 spinlock_t lock;
192 struct pci_dev *pdev;
193
194 struct dscc4_dev_priv *root;
195 dma_addr_t iqcfg_dma;
196 u32 xtal_hz;
197 };
198
199 struct dscc4_dev_priv {
200 struct sk_buff *rx_skbuff[RX_RING_SIZE];
201 struct sk_buff *tx_skbuff[TX_RING_SIZE];
202
203 struct RxFD *rx_fd;
204 struct TxFD *tx_fd;
205 __le32 *iqrx;
206 __le32 *iqtx;
207
208 /* FIXME: check all the volatile are required */
209 volatile u32 tx_current;
210 u32 rx_current;
211 u32 iqtx_current;
212 u32 iqrx_current;
213
214 volatile u32 tx_dirty;
215 volatile u32 ltda;
216 u32 rx_dirty;
217 u32 lrda;
218
219 dma_addr_t tx_fd_dma;
220 dma_addr_t rx_fd_dma;
221 dma_addr_t iqtx_dma;
222 dma_addr_t iqrx_dma;
223
224 u32 scc_regs[SCC_REGISTERS_MAX]; /* Cf errata DS5 p.4 */
225
226 struct timer_list timer;
227
228 struct dscc4_pci_priv *pci_priv;
229 spinlock_t lock;
230
231 int dev_id;
232 volatile u32 flags;
233 u32 timer_help;
234
235 unsigned short encoding;
236 unsigned short parity;
237 struct net_device *dev;
238 sync_serial_settings settings;
239 void __iomem *base_addr;
240 u32 __pad __attribute__ ((aligned (4)));
241 };
242
243 /* GLOBAL registers definitions */
244 #define GCMDR 0x00
245 #define GSTAR 0x04
246 #define GMODE 0x08
247 #define IQLENR0 0x0C
248 #define IQLENR1 0x10
249 #define IQRX0 0x14
250 #define IQTX0 0x24
251 #define IQCFG 0x3c
252 #define FIFOCR1 0x44
253 #define FIFOCR2 0x48
254 #define FIFOCR3 0x4c
255 #define FIFOCR4 0x34
256 #define CH0CFG 0x50
257 #define CH0BRDA 0x54
258 #define CH0BTDA 0x58
259 #define CH0FRDA 0x98
260 #define CH0FTDA 0xb0
261 #define CH0LRDA 0xc8
262 #define CH0LTDA 0xe0
263
264 /* SCC registers definitions */
265 #define SCC_START 0x0100
266 #define SCC_OFFSET 0x80
267 #define CMDR 0x00
268 #define STAR 0x04
269 #define CCR0 0x08
270 #define CCR1 0x0c
271 #define CCR2 0x10
272 #define BRR 0x2C
273 #define RLCR 0x40
274 #define IMR 0x54
275 #define ISR 0x58
276
277 #define GPDIR 0x0400
278 #define GPDATA 0x0404
279 #define GPIM 0x0408
280
281 /* Bit masks */
282 #define EncodingMask 0x00700000
283 #define CrcMask 0x00000003
284
285 #define IntRxScc0 0x10000000
286 #define IntTxScc0 0x01000000
287
288 #define TxPollCmd 0x00000400
289 #define RxActivate 0x08000000
290 #define MTFi 0x04000000
291 #define Rdr 0x00400000
292 #define Rdt 0x00200000
293 #define Idr 0x00100000
294 #define Idt 0x00080000
295 #define TxSccRes 0x01000000
296 #define RxSccRes 0x00010000
297 #define TxSizeMax 0x1fff /* Datasheet DS1 - 11.1.1.1 */
298 #define RxSizeMax 0x1ffc /* Datasheet DS1 - 11.1.2.1 */
299
300 #define Ccr0ClockMask 0x0000003f
301 #define Ccr1LoopMask 0x00000200
302 #define IsrMask 0x000fffff
303 #define BrrExpMask 0x00000f00
304 #define BrrMultMask 0x0000003f
305 #define EncodingMask 0x00700000
306 #define Hold cpu_to_le32(0x40000000)
307 #define SccBusy 0x10000000
308 #define PowerUp 0x80000000
309 #define Vis 0x00001000
310 #define FrameOk (FrameVfr | FrameCrc)
311 #define FrameVfr 0x80
312 #define FrameRdo 0x40
313 #define FrameCrc 0x20
314 #define FrameRab 0x10
315 #define FrameAborted cpu_to_le32(0x00000200)
316 #define FrameEnd cpu_to_le32(0x80000000)
317 #define DataComplete cpu_to_le32(0x40000000)
318 #define LengthCheck 0x00008000
319 #define SccEvt 0x02000000
320 #define NoAck 0x00000200
321 #define Action 0x00000001
322 #define HiDesc cpu_to_le32(0x20000000)
323
324 /* SCC events */
325 #define RxEvt 0xf0000000
326 #define TxEvt 0x0f000000
327 #define Alls 0x00040000
328 #define Xdu 0x00010000
329 #define Cts 0x00004000
330 #define Xmr 0x00002000
331 #define Xpr 0x00001000
332 #define Rdo 0x00000080
333 #define Rfs 0x00000040
334 #define Cd 0x00000004
335 #define Rfo 0x00000002
336 #define Flex 0x00000001
337
338 /* DMA core events */
339 #define Cfg 0x00200000
340 #define Hi 0x00040000
341 #define Fi 0x00020000
342 #define Err 0x00010000
343 #define Arf 0x00000002
344 #define ArAck 0x00000001
345
346 /* State flags */
347 #define Ready 0x00000000
348 #define NeedIDR 0x00000001
349 #define NeedIDT 0x00000002
350 #define RdoSet 0x00000004
351 #define FakeReset 0x00000008
352
353 /* Don't mask RDO. Ever. */
354 #ifdef DSCC4_POLLING
355 #define EventsMask 0xfffeef7f
356 #else
357 #define EventsMask 0xfffa8f7a
358 #endif
359
360 /* Functions prototypes */
361 static void dscc4_rx_irq(struct dscc4_pci_priv *, struct dscc4_dev_priv *);
362 static void dscc4_tx_irq(struct dscc4_pci_priv *, struct dscc4_dev_priv *);
363 static int dscc4_found1(struct pci_dev *, void __iomem *ioaddr);
364 static int dscc4_init_one(struct pci_dev *, const struct pci_device_id *ent);
365 static int dscc4_open(struct net_device *);
366 static netdev_tx_t dscc4_start_xmit(struct sk_buff *,
367 struct net_device *);
368 static int dscc4_close(struct net_device *);
369 static int dscc4_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
370 static int dscc4_init_ring(struct net_device *);
371 static void dscc4_release_ring(struct dscc4_dev_priv *);
372 static void dscc4_timer(unsigned long);
373 static void dscc4_tx_timeout(struct net_device *);
374 static irqreturn_t dscc4_irq(int irq, void *dev_id);
375 static int dscc4_hdlc_attach(struct net_device *, unsigned short, unsigned short);
376 static int dscc4_set_iface(struct dscc4_dev_priv *, struct net_device *);
377 #ifdef DSCC4_POLLING
378 static int dscc4_tx_poll(struct dscc4_dev_priv *, struct net_device *);
379 #endif
380
381 static inline struct dscc4_dev_priv *dscc4_priv(struct net_device *dev)
382 {
383 return dev_to_hdlc(dev)->priv;
384 }
385
386 static inline struct net_device *dscc4_to_dev(struct dscc4_dev_priv *p)
387 {
388 return p->dev;
389 }
390
391 static void scc_patchl(u32 mask, u32 value, struct dscc4_dev_priv *dpriv,
392 struct net_device *dev, int offset)
393 {
394 u32 state;
395
396 /* Cf scc_writel for concern regarding thread-safety */
397 state = dpriv->scc_regs[offset >> 2];
398 state &= ~mask;
399 state |= value;
400 dpriv->scc_regs[offset >> 2] = state;
401 writel(state, dpriv->base_addr + SCC_REG_START(dpriv) + offset);
402 }
403
404 static void scc_writel(u32 bits, struct dscc4_dev_priv *dpriv,
405 struct net_device *dev, int offset)
406 {
407 /*
408 * Thread-UNsafe.
409 * As of 2002/02/16, there are no thread racing for access.
410 */
411 dpriv->scc_regs[offset >> 2] = bits;
412 writel(bits, dpriv->base_addr + SCC_REG_START(dpriv) + offset);
413 }
414
415 static inline u32 scc_readl(struct dscc4_dev_priv *dpriv, int offset)
416 {
417 return dpriv->scc_regs[offset >> 2];
418 }
419
420 static u32 scc_readl_star(struct dscc4_dev_priv *dpriv, struct net_device *dev)
421 {
422 /* Cf errata DS5 p.4 */
423 readl(dpriv->base_addr + SCC_REG_START(dpriv) + STAR);
424 return readl(dpriv->base_addr + SCC_REG_START(dpriv) + STAR);
425 }
426
427 static inline void dscc4_do_tx(struct dscc4_dev_priv *dpriv,
428 struct net_device *dev)
429 {
430 dpriv->ltda = dpriv->tx_fd_dma +
431 ((dpriv->tx_current-1)%TX_RING_SIZE)*sizeof(struct TxFD);
432 writel(dpriv->ltda, dpriv->base_addr + CH0LTDA + dpriv->dev_id*4);
433 /* Flush posted writes *NOW* */
434 readl(dpriv->base_addr + CH0LTDA + dpriv->dev_id*4);
435 }
436
437 static inline void dscc4_rx_update(struct dscc4_dev_priv *dpriv,
438 struct net_device *dev)
439 {
440 dpriv->lrda = dpriv->rx_fd_dma +
441 ((dpriv->rx_dirty - 1)%RX_RING_SIZE)*sizeof(struct RxFD);
442 writel(dpriv->lrda, dpriv->base_addr + CH0LRDA + dpriv->dev_id*4);
443 }
444
445 static inline unsigned int dscc4_tx_done(struct dscc4_dev_priv *dpriv)
446 {
447 return dpriv->tx_current == dpriv->tx_dirty;
448 }
449
450 static inline unsigned int dscc4_tx_quiescent(struct dscc4_dev_priv *dpriv,
451 struct net_device *dev)
452 {
453 return readl(dpriv->base_addr + CH0FTDA + dpriv->dev_id*4) == dpriv->ltda;
454 }
455
456 static int state_check(u32 state, struct dscc4_dev_priv *dpriv,
457 struct net_device *dev, const char *msg)
458 {
459 int ret = 0;
460
461 if (debug > 1) {
462 if (SOURCE_ID(state) != dpriv->dev_id) {
463 printk(KERN_DEBUG "%s (%s): Source Id=%d, state=%08x\n",
464 dev->name, msg, SOURCE_ID(state), state );
465 ret = -1;
466 }
467 if (state & 0x0df80c00) {
468 printk(KERN_DEBUG "%s (%s): state=%08x (UFO alert)\n",
469 dev->name, msg, state);
470 ret = -1;
471 }
472 }
473 return ret;
474 }
475
476 static void dscc4_tx_print(struct net_device *dev,
477 struct dscc4_dev_priv *dpriv,
478 char *msg)
479 {
480 printk(KERN_DEBUG "%s: tx_current=%02d tx_dirty=%02d (%s)\n",
481 dev->name, dpriv->tx_current, dpriv->tx_dirty, msg);
482 }
483
484 static void dscc4_release_ring(struct dscc4_dev_priv *dpriv)
485 {
486 struct pci_dev *pdev = dpriv->pci_priv->pdev;
487 struct TxFD *tx_fd = dpriv->tx_fd;
488 struct RxFD *rx_fd = dpriv->rx_fd;
489 struct sk_buff **skbuff;
490 int i;
491
492 pci_free_consistent(pdev, TX_TOTAL_SIZE, tx_fd, dpriv->tx_fd_dma);
493 pci_free_consistent(pdev, RX_TOTAL_SIZE, rx_fd, dpriv->rx_fd_dma);
494
495 skbuff = dpriv->tx_skbuff;
496 for (i = 0; i < TX_RING_SIZE; i++) {
497 if (*skbuff) {
498 pci_unmap_single(pdev, le32_to_cpu(tx_fd->data),
499 (*skbuff)->len, PCI_DMA_TODEVICE);
500 dev_kfree_skb(*skbuff);
501 }
502 skbuff++;
503 tx_fd++;
504 }
505
506 skbuff = dpriv->rx_skbuff;
507 for (i = 0; i < RX_RING_SIZE; i++) {
508 if (*skbuff) {
509 pci_unmap_single(pdev, le32_to_cpu(rx_fd->data),
510 RX_MAX(HDLC_MAX_MRU), PCI_DMA_FROMDEVICE);
511 dev_kfree_skb(*skbuff);
512 }
513 skbuff++;
514 rx_fd++;
515 }
516 }
517
518 static inline int try_get_rx_skb(struct dscc4_dev_priv *dpriv,
519 struct net_device *dev)
520 {
521 unsigned int dirty = dpriv->rx_dirty%RX_RING_SIZE;
522 struct RxFD *rx_fd = dpriv->rx_fd + dirty;
523 const int len = RX_MAX(HDLC_MAX_MRU);
524 struct sk_buff *skb;
525 int ret = 0;
526
527 skb = dev_alloc_skb(len);
528 dpriv->rx_skbuff[dirty] = skb;
529 if (skb) {
530 skb->protocol = hdlc_type_trans(skb, dev);
531 rx_fd->data = cpu_to_le32(pci_map_single(dpriv->pci_priv->pdev,
532 skb->data, len, PCI_DMA_FROMDEVICE));
533 } else {
534 rx_fd->data = 0;
535 ret = -1;
536 }
537 return ret;
538 }
539
540 /*
541 * IRQ/thread/whatever safe
542 */
543 static int dscc4_wait_ack_cec(struct dscc4_dev_priv *dpriv,
544 struct net_device *dev, char *msg)
545 {
546 s8 i = 0;
547
548 do {
549 if (!(scc_readl_star(dpriv, dev) & SccBusy)) {
550 printk(KERN_DEBUG "%s: %s ack (%d try)\n", dev->name,
551 msg, i);
552 goto done;
553 }
554 schedule_timeout_uninterruptible(msecs_to_jiffies(100));
555 rmb();
556 } while (++i > 0);
557 netdev_err(dev, "%s timeout\n", msg);
558 done:
559 return (i >= 0) ? i : -EAGAIN;
560 }
561
562 static int dscc4_do_action(struct net_device *dev, char *msg)
563 {
564 void __iomem *ioaddr = dscc4_priv(dev)->base_addr;
565 s16 i = 0;
566
567 writel(Action, ioaddr + GCMDR);
568 ioaddr += GSTAR;
569 do {
570 u32 state = readl(ioaddr);
571
572 if (state & ArAck) {
573 netdev_dbg(dev, "%s ack\n", msg);
574 writel(ArAck, ioaddr);
575 goto done;
576 } else if (state & Arf) {
577 netdev_err(dev, "%s failed\n", msg);
578 writel(Arf, ioaddr);
579 i = -1;
580 goto done;
581 }
582 rmb();
583 } while (++i > 0);
584 netdev_err(dev, "%s timeout\n", msg);
585 done:
586 return i;
587 }
588
589 static inline int dscc4_xpr_ack(struct dscc4_dev_priv *dpriv)
590 {
591 int cur = dpriv->iqtx_current%IRQ_RING_SIZE;
592 s8 i = 0;
593
594 do {
595 if (!(dpriv->flags & (NeedIDR | NeedIDT)) ||
596 (dpriv->iqtx[cur] & cpu_to_le32(Xpr)))
597 break;
598 smp_rmb();
599 schedule_timeout_uninterruptible(msecs_to_jiffies(100));
600 } while (++i > 0);
601
602 return (i >= 0 ) ? i : -EAGAIN;
603 }
604
605 #if 0 /* dscc4_{rx/tx}_reset are both unreliable - more tweak needed */
606 static void dscc4_rx_reset(struct dscc4_dev_priv *dpriv, struct net_device *dev)
607 {
608 unsigned long flags;
609
610 spin_lock_irqsave(&dpriv->pci_priv->lock, flags);
611 /* Cf errata DS5 p.6 */
612 writel(0x00000000, dpriv->base_addr + CH0LRDA + dpriv->dev_id*4);
613 scc_patchl(PowerUp, 0, dpriv, dev, CCR0);
614 readl(dpriv->base_addr + CH0LRDA + dpriv->dev_id*4);
615 writel(MTFi|Rdr, dpriv->base_addr + dpriv->dev_id*0x0c + CH0CFG);
616 writel(Action, dpriv->base_addr + GCMDR);
617 spin_unlock_irqrestore(&dpriv->pci_priv->lock, flags);
618 }
619
620 #endif
621
622 #if 0
623 static void dscc4_tx_reset(struct dscc4_dev_priv *dpriv, struct net_device *dev)
624 {
625 u16 i = 0;
626
627 /* Cf errata DS5 p.7 */
628 scc_patchl(PowerUp, 0, dpriv, dev, CCR0);
629 scc_writel(0x00050000, dpriv, dev, CCR2);
630 /*
631 * Must be longer than the time required to fill the fifo.
632 */
633 while (!dscc4_tx_quiescent(dpriv, dev) && ++i) {
634 udelay(1);
635 wmb();
636 }
637
638 writel(MTFi|Rdt, dpriv->base_addr + dpriv->dev_id*0x0c + CH0CFG);
639 if (dscc4_do_action(dev, "Rdt") < 0)
640 netdev_err(dev, "Tx reset failed\n");
641 }
642 #endif
643
644 /* TODO: (ab)use this function to refill a completely depleted RX ring. */
645 static inline void dscc4_rx_skb(struct dscc4_dev_priv *dpriv,
646 struct net_device *dev)
647 {
648 struct RxFD *rx_fd = dpriv->rx_fd + dpriv->rx_current%RX_RING_SIZE;
649 struct pci_dev *pdev = dpriv->pci_priv->pdev;
650 struct sk_buff *skb;
651 int pkt_len;
652
653 skb = dpriv->rx_skbuff[dpriv->rx_current++%RX_RING_SIZE];
654 if (!skb) {
655 printk(KERN_DEBUG "%s: skb=0 (%s)\n", dev->name, __func__);
656 goto refill;
657 }
658 pkt_len = TO_SIZE(le32_to_cpu(rx_fd->state2));
659 pci_unmap_single(pdev, le32_to_cpu(rx_fd->data),
660 RX_MAX(HDLC_MAX_MRU), PCI_DMA_FROMDEVICE);
661 if ((skb->data[--pkt_len] & FrameOk) == FrameOk) {
662 dev->stats.rx_packets++;
663 dev->stats.rx_bytes += pkt_len;
664 skb_put(skb, pkt_len);
665 if (netif_running(dev))
666 skb->protocol = hdlc_type_trans(skb, dev);
667 netif_rx(skb);
668 } else {
669 if (skb->data[pkt_len] & FrameRdo)
670 dev->stats.rx_fifo_errors++;
671 else if (!(skb->data[pkt_len] & FrameCrc))
672 dev->stats.rx_crc_errors++;
673 else if ((skb->data[pkt_len] & (FrameVfr | FrameRab)) !=
674 (FrameVfr | FrameRab))
675 dev->stats.rx_length_errors++;
676 dev->stats.rx_errors++;
677 dev_kfree_skb_irq(skb);
678 }
679 refill:
680 while ((dpriv->rx_dirty - dpriv->rx_current) % RX_RING_SIZE) {
681 if (try_get_rx_skb(dpriv, dev) < 0)
682 break;
683 dpriv->rx_dirty++;
684 }
685 dscc4_rx_update(dpriv, dev);
686 rx_fd->state2 = 0x00000000;
687 rx_fd->end = cpu_to_le32(0xbabeface);
688 }
689
690 static void dscc4_free1(struct pci_dev *pdev)
691 {
692 struct dscc4_pci_priv *ppriv;
693 struct dscc4_dev_priv *root;
694 int i;
695
696 ppriv = pci_get_drvdata(pdev);
697 root = ppriv->root;
698
699 for (i = 0; i < dev_per_card; i++)
700 unregister_hdlc_device(dscc4_to_dev(root + i));
701
702 for (i = 0; i < dev_per_card; i++)
703 free_netdev(root[i].dev);
704 kfree(root);
705 kfree(ppriv);
706 }
707
708 static int dscc4_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
709 {
710 struct dscc4_pci_priv *priv;
711 struct dscc4_dev_priv *dpriv;
712 void __iomem *ioaddr;
713 int i, rc;
714
715 printk(KERN_DEBUG "%s", version);
716
717 rc = pci_enable_device(pdev);
718 if (rc < 0)
719 goto out;
720
721 rc = pci_request_region(pdev, 0, "registers");
722 if (rc < 0) {
723 pr_err("can't reserve MMIO region (regs)\n");
724 goto err_disable_0;
725 }
726 rc = pci_request_region(pdev, 1, "LBI interface");
727 if (rc < 0) {
728 pr_err("can't reserve MMIO region (lbi)\n");
729 goto err_free_mmio_region_1;
730 }
731
732 ioaddr = pci_ioremap_bar(pdev, 0);
733 if (!ioaddr) {
734 pr_err("cannot remap MMIO region %llx @ %llx\n",
735 (unsigned long long)pci_resource_len(pdev, 0),
736 (unsigned long long)pci_resource_start(pdev, 0));
737 rc = -EIO;
738 goto err_free_mmio_regions_2;
739 }
740 printk(KERN_DEBUG "Siemens DSCC4, MMIO at %#llx (regs), %#llx (lbi), IRQ %d\n",
741 (unsigned long long)pci_resource_start(pdev, 0),
742 (unsigned long long)pci_resource_start(pdev, 1), pdev->irq);
743
744 /* Cf errata DS5 p.2 */
745 pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 0xf8);
746 pci_set_master(pdev);
747
748 rc = dscc4_found1(pdev, ioaddr);
749 if (rc < 0)
750 goto err_iounmap_3;
751
752 priv = pci_get_drvdata(pdev);
753
754 rc = request_irq(pdev->irq, dscc4_irq, IRQF_SHARED, DRV_NAME, priv->root);
755 if (rc < 0) {
756 pr_warn("IRQ %d busy\n", pdev->irq);
757 goto err_release_4;
758 }
759
760 /* power up/little endian/dma core controlled via lrda/ltda */
761 writel(0x00000001, ioaddr + GMODE);
762 /* Shared interrupt queue */
763 {
764 u32 bits;
765
766 bits = (IRQ_RING_SIZE >> 5) - 1;
767 bits |= bits << 4;
768 bits |= bits << 8;
769 bits |= bits << 16;
770 writel(bits, ioaddr + IQLENR0);
771 }
772 /* Global interrupt queue */
773 writel((u32)(((IRQ_RING_SIZE >> 5) - 1) << 20), ioaddr + IQLENR1);
774
775 rc = -ENOMEM;
776
777 priv->iqcfg = (__le32 *) pci_alloc_consistent(pdev,
778 IRQ_RING_SIZE*sizeof(__le32), &priv->iqcfg_dma);
779 if (!priv->iqcfg)
780 goto err_free_irq_5;
781 writel(priv->iqcfg_dma, ioaddr + IQCFG);
782
783 /*
784 * SCC 0-3 private rx/tx irq structures
785 * IQRX/TXi needs to be set soon. Learned it the hard way...
786 */
787 for (i = 0; i < dev_per_card; i++) {
788 dpriv = priv->root + i;
789 dpriv->iqtx = (__le32 *) pci_alloc_consistent(pdev,
790 IRQ_RING_SIZE*sizeof(u32), &dpriv->iqtx_dma);
791 if (!dpriv->iqtx)
792 goto err_free_iqtx_6;
793 writel(dpriv->iqtx_dma, ioaddr + IQTX0 + i*4);
794 }
795 for (i = 0; i < dev_per_card; i++) {
796 dpriv = priv->root + i;
797 dpriv->iqrx = (__le32 *) pci_alloc_consistent(pdev,
798 IRQ_RING_SIZE*sizeof(u32), &dpriv->iqrx_dma);
799 if (!dpriv->iqrx)
800 goto err_free_iqrx_7;
801 writel(dpriv->iqrx_dma, ioaddr + IQRX0 + i*4);
802 }
803
804 /* Cf application hint. Beware of hard-lock condition on threshold. */
805 writel(0x42104000, ioaddr + FIFOCR1);
806 //writel(0x9ce69800, ioaddr + FIFOCR2);
807 writel(0xdef6d800, ioaddr + FIFOCR2);
808 //writel(0x11111111, ioaddr + FIFOCR4);
809 writel(0x18181818, ioaddr + FIFOCR4);
810 // FIXME: should depend on the chipset revision
811 writel(0x0000000e, ioaddr + FIFOCR3);
812
813 writel(0xff200001, ioaddr + GCMDR);
814
815 rc = 0;
816 out:
817 return rc;
818
819 err_free_iqrx_7:
820 while (--i >= 0) {
821 dpriv = priv->root + i;
822 pci_free_consistent(pdev, IRQ_RING_SIZE*sizeof(u32),
823 dpriv->iqrx, dpriv->iqrx_dma);
824 }
825 i = dev_per_card;
826 err_free_iqtx_6:
827 while (--i >= 0) {
828 dpriv = priv->root + i;
829 pci_free_consistent(pdev, IRQ_RING_SIZE*sizeof(u32),
830 dpriv->iqtx, dpriv->iqtx_dma);
831 }
832 pci_free_consistent(pdev, IRQ_RING_SIZE*sizeof(u32), priv->iqcfg,
833 priv->iqcfg_dma);
834 err_free_irq_5:
835 free_irq(pdev->irq, priv->root);
836 err_release_4:
837 dscc4_free1(pdev);
838 err_iounmap_3:
839 iounmap (ioaddr);
840 err_free_mmio_regions_2:
841 pci_release_region(pdev, 1);
842 err_free_mmio_region_1:
843 pci_release_region(pdev, 0);
844 err_disable_0:
845 pci_disable_device(pdev);
846 goto out;
847 };
848
849 /*
850 * Let's hope the default values are decent enough to protect my
851 * feet from the user's gun - Ueimor
852 */
853 static void dscc4_init_registers(struct dscc4_dev_priv *dpriv,
854 struct net_device *dev)
855 {
856 /* No interrupts, SCC core disabled. Let's relax */
857 scc_writel(0x00000000, dpriv, dev, CCR0);
858
859 scc_writel(LengthCheck | (HDLC_MAX_MRU >> 5), dpriv, dev, RLCR);
860
861 /*
862 * No address recognition/crc-CCITT/cts enabled
863 * Shared flags transmission disabled - cf errata DS5 p.11
864 * Carrier detect disabled - cf errata p.14
865 * FIXME: carrier detection/polarity may be handled more gracefully.
866 */
867 scc_writel(0x02408000, dpriv, dev, CCR1);
868
869 /* crc not forwarded - Cf errata DS5 p.11 */
870 scc_writel(0x00050008 & ~RxActivate, dpriv, dev, CCR2);
871 // crc forwarded
872 //scc_writel(0x00250008 & ~RxActivate, dpriv, dev, CCR2);
873 }
874
875 static inline int dscc4_set_quartz(struct dscc4_dev_priv *dpriv, int hz)
876 {
877 int ret = 0;
878
879 if ((hz < 0) || (hz > DSCC4_HZ_MAX))
880 ret = -EOPNOTSUPP;
881 else
882 dpriv->pci_priv->xtal_hz = hz;
883
884 return ret;
885 }
886
887 static const struct net_device_ops dscc4_ops = {
888 .ndo_open = dscc4_open,
889 .ndo_stop = dscc4_close,
890 .ndo_change_mtu = hdlc_change_mtu,
891 .ndo_start_xmit = hdlc_start_xmit,
892 .ndo_do_ioctl = dscc4_ioctl,
893 .ndo_tx_timeout = dscc4_tx_timeout,
894 };
895
896 static int dscc4_found1(struct pci_dev *pdev, void __iomem *ioaddr)
897 {
898 struct dscc4_pci_priv *ppriv;
899 struct dscc4_dev_priv *root;
900 int i, ret = -ENOMEM;
901
902 root = kcalloc(dev_per_card, sizeof(*root), GFP_KERNEL);
903 if (!root)
904 goto err_out;
905
906 for (i = 0; i < dev_per_card; i++) {
907 root[i].dev = alloc_hdlcdev(root + i);
908 if (!root[i].dev)
909 goto err_free_dev;
910 }
911
912 ppriv = kzalloc(sizeof(*ppriv), GFP_KERNEL);
913 if (!ppriv)
914 goto err_free_dev;
915
916 ppriv->root = root;
917 spin_lock_init(&ppriv->lock);
918
919 for (i = 0; i < dev_per_card; i++) {
920 struct dscc4_dev_priv *dpriv = root + i;
921 struct net_device *d = dscc4_to_dev(dpriv);
922 hdlc_device *hdlc = dev_to_hdlc(d);
923
924 d->base_addr = (unsigned long)ioaddr;
925 d->irq = pdev->irq;
926 d->netdev_ops = &dscc4_ops;
927 d->watchdog_timeo = TX_TIMEOUT;
928 SET_NETDEV_DEV(d, &pdev->dev);
929
930 dpriv->dev_id = i;
931 dpriv->pci_priv = ppriv;
932 dpriv->base_addr = ioaddr;
933 spin_lock_init(&dpriv->lock);
934
935 hdlc->xmit = dscc4_start_xmit;
936 hdlc->attach = dscc4_hdlc_attach;
937
938 dscc4_init_registers(dpriv, d);
939 dpriv->parity = PARITY_CRC16_PR0_CCITT;
940 dpriv->encoding = ENCODING_NRZ;
941
942 ret = dscc4_init_ring(d);
943 if (ret < 0)
944 goto err_unregister;
945
946 ret = register_hdlc_device(d);
947 if (ret < 0) {
948 pr_err("unable to register\n");
949 dscc4_release_ring(dpriv);
950 goto err_unregister;
951 }
952 }
953
954 ret = dscc4_set_quartz(root, quartz);
955 if (ret < 0)
956 goto err_unregister;
957
958 pci_set_drvdata(pdev, ppriv);
959 return ret;
960
961 err_unregister:
962 while (i-- > 0) {
963 dscc4_release_ring(root + i);
964 unregister_hdlc_device(dscc4_to_dev(root + i));
965 }
966 kfree(ppriv);
967 i = dev_per_card;
968 err_free_dev:
969 while (i-- > 0)
970 free_netdev(root[i].dev);
971 kfree(root);
972 err_out:
973 return ret;
974 };
975
976 /* FIXME: get rid of the unneeded code */
977 static void dscc4_timer(unsigned long data)
978 {
979 struct net_device *dev = (struct net_device *)data;
980 struct dscc4_dev_priv *dpriv = dscc4_priv(dev);
981 // struct dscc4_pci_priv *ppriv;
982
983 goto done;
984 done:
985 dpriv->timer.expires = jiffies + TX_TIMEOUT;
986 add_timer(&dpriv->timer);
987 }
988
989 static void dscc4_tx_timeout(struct net_device *dev)
990 {
991 /* FIXME: something is missing there */
992 }
993
994 static int dscc4_loopback_check(struct dscc4_dev_priv *dpriv)
995 {
996 sync_serial_settings *settings = &dpriv->settings;
997
998 if (settings->loopback && (settings->clock_type != CLOCK_INT)) {
999 struct net_device *dev = dscc4_to_dev(dpriv);
1000
1001 netdev_info(dev, "loopback requires clock\n");
1002 return -1;
1003 }
1004 return 0;
1005 }
1006
1007 #ifdef CONFIG_DSCC4_PCI_RST
1008 /*
1009 * Some DSCC4-based cards wires the GPIO port and the PCI #RST pin together
1010 * so as to provide a safe way to reset the asic while not the whole machine
1011 * rebooting.
1012 *
1013 * This code doesn't need to be efficient. Keep It Simple
1014 */
1015 static void dscc4_pci_reset(struct pci_dev *pdev, void __iomem *ioaddr)
1016 {
1017 int i;
1018
1019 mutex_lock(&dscc4_mutex);
1020 for (i = 0; i < 16; i++)
1021 pci_read_config_dword(pdev, i << 2, dscc4_pci_config_store + i);
1022
1023 /* Maximal LBI clock divider (who cares ?) and whole GPIO range. */
1024 writel(0x001c0000, ioaddr + GMODE);
1025 /* Configure GPIO port as output */
1026 writel(0x0000ffff, ioaddr + GPDIR);
1027 /* Disable interruption */
1028 writel(0x0000ffff, ioaddr + GPIM);
1029
1030 writel(0x0000ffff, ioaddr + GPDATA);
1031 writel(0x00000000, ioaddr + GPDATA);
1032
1033 /* Flush posted writes */
1034 readl(ioaddr + GSTAR);
1035
1036 schedule_timeout_uninterruptible(msecs_to_jiffies(100));
1037
1038 for (i = 0; i < 16; i++)
1039 pci_write_config_dword(pdev, i << 2, dscc4_pci_config_store[i]);
1040 mutex_unlock(&dscc4_mutex);
1041 }
1042 #else
1043 #define dscc4_pci_reset(pdev,ioaddr) do {} while (0)
1044 #endif /* CONFIG_DSCC4_PCI_RST */
1045
1046 static int dscc4_open(struct net_device *dev)
1047 {
1048 struct dscc4_dev_priv *dpriv = dscc4_priv(dev);
1049 int ret = -EAGAIN;
1050
1051 if ((dscc4_loopback_check(dpriv) < 0))
1052 goto err;
1053
1054 if ((ret = hdlc_open(dev)))
1055 goto err;
1056
1057 /*
1058 * Due to various bugs, there is no way to reliably reset a
1059 * specific port (manufacturer's dependent special PCI #RST wiring
1060 * apart: it affects all ports). Thus the device goes in the best
1061 * silent mode possible at dscc4_close() time and simply claims to
1062 * be up if it's opened again. It still isn't possible to change
1063 * the HDLC configuration without rebooting but at least the ports
1064 * can be up/down ifconfig'ed without killing the host.
1065 */
1066 if (dpriv->flags & FakeReset) {
1067 dpriv->flags &= ~FakeReset;
1068 scc_patchl(0, PowerUp, dpriv, dev, CCR0);
1069 scc_patchl(0, 0x00050000, dpriv, dev, CCR2);
1070 scc_writel(EventsMask, dpriv, dev, IMR);
1071 netdev_info(dev, "up again\n");
1072 goto done;
1073 }
1074
1075 /* IDT+IDR during XPR */
1076 dpriv->flags = NeedIDR | NeedIDT;
1077
1078 scc_patchl(0, PowerUp | Vis, dpriv, dev, CCR0);
1079
1080 /*
1081 * The following is a bit paranoid...
1082 *
1083 * NB: the datasheet "...CEC will stay active if the SCC is in
1084 * power-down mode or..." and CCR2.RAC = 1 are two different
1085 * situations.
1086 */
1087 if (scc_readl_star(dpriv, dev) & SccBusy) {
1088 netdev_err(dev, "busy - try later\n");
1089 ret = -EAGAIN;
1090 goto err_out;
1091 } else
1092 netdev_info(dev, "available - good\n");
1093
1094 scc_writel(EventsMask, dpriv, dev, IMR);
1095
1096 /* Posted write is flushed in the wait_ack loop */
1097 scc_writel(TxSccRes | RxSccRes, dpriv, dev, CMDR);
1098
1099 if ((ret = dscc4_wait_ack_cec(dpriv, dev, "Cec")) < 0)
1100 goto err_disable_scc_events;
1101
1102 /*
1103 * I would expect XPR near CE completion (before ? after ?).
1104 * At worst, this code won't see a late XPR and people
1105 * will have to re-issue an ifconfig (this is harmless).
1106 * WARNING, a really missing XPR usually means a hardware
1107 * reset is needed. Suggestions anyone ?
1108 */
1109 if ((ret = dscc4_xpr_ack(dpriv)) < 0) {
1110 pr_err("XPR timeout\n");
1111 goto err_disable_scc_events;
1112 }
1113
1114 if (debug > 2)
1115 dscc4_tx_print(dev, dpriv, "Open");
1116
1117 done:
1118 netif_start_queue(dev);
1119
1120 init_timer(&dpriv->timer);
1121 dpriv->timer.expires = jiffies + 10*HZ;
1122 dpriv->timer.data = (unsigned long)dev;
1123 dpriv->timer.function = dscc4_timer;
1124 add_timer(&dpriv->timer);
1125 netif_carrier_on(dev);
1126
1127 return 0;
1128
1129 err_disable_scc_events:
1130 scc_writel(0xffffffff, dpriv, dev, IMR);
1131 scc_patchl(PowerUp | Vis, 0, dpriv, dev, CCR0);
1132 err_out:
1133 hdlc_close(dev);
1134 err:
1135 return ret;
1136 }
1137
1138 #ifdef DSCC4_POLLING
1139 static int dscc4_tx_poll(struct dscc4_dev_priv *dpriv, struct net_device *dev)
1140 {
1141 /* FIXME: it's gonna be easy (TM), for sure */
1142 }
1143 #endif /* DSCC4_POLLING */
1144
1145 static netdev_tx_t dscc4_start_xmit(struct sk_buff *skb,
1146 struct net_device *dev)
1147 {
1148 struct dscc4_dev_priv *dpriv = dscc4_priv(dev);
1149 struct dscc4_pci_priv *ppriv = dpriv->pci_priv;
1150 struct TxFD *tx_fd;
1151 int next;
1152
1153 next = dpriv->tx_current%TX_RING_SIZE;
1154 dpriv->tx_skbuff[next] = skb;
1155 tx_fd = dpriv->tx_fd + next;
1156 tx_fd->state = FrameEnd | TO_STATE_TX(skb->len);
1157 tx_fd->data = cpu_to_le32(pci_map_single(ppriv->pdev, skb->data, skb->len,
1158 PCI_DMA_TODEVICE));
1159 tx_fd->complete = 0x00000000;
1160 tx_fd->jiffies = jiffies;
1161 mb();
1162
1163 #ifdef DSCC4_POLLING
1164 spin_lock(&dpriv->lock);
1165 while (dscc4_tx_poll(dpriv, dev));
1166 spin_unlock(&dpriv->lock);
1167 #endif
1168
1169 if (debug > 2)
1170 dscc4_tx_print(dev, dpriv, "Xmit");
1171 /* To be cleaned(unsigned int)/optimized. Later, ok ? */
1172 if (!((++dpriv->tx_current - dpriv->tx_dirty)%TX_RING_SIZE))
1173 netif_stop_queue(dev);
1174
1175 if (dscc4_tx_quiescent(dpriv, dev))
1176 dscc4_do_tx(dpriv, dev);
1177
1178 return NETDEV_TX_OK;
1179 }
1180
1181 static int dscc4_close(struct net_device *dev)
1182 {
1183 struct dscc4_dev_priv *dpriv = dscc4_priv(dev);
1184
1185 del_timer_sync(&dpriv->timer);
1186 netif_stop_queue(dev);
1187
1188 scc_patchl(PowerUp | Vis, 0, dpriv, dev, CCR0);
1189 scc_patchl(0x00050000, 0, dpriv, dev, CCR2);
1190 scc_writel(0xffffffff, dpriv, dev, IMR);
1191
1192 dpriv->flags |= FakeReset;
1193
1194 hdlc_close(dev);
1195
1196 return 0;
1197 }
1198
1199 static inline int dscc4_check_clock_ability(int port)
1200 {
1201 int ret = 0;
1202
1203 #ifdef CONFIG_DSCC4_PCISYNC
1204 if (port >= 2)
1205 ret = -1;
1206 #endif
1207 return ret;
1208 }
1209
1210 /*
1211 * DS1 p.137: "There are a total of 13 different clocking modes..."
1212 * ^^
1213 * Design choices:
1214 * - by default, assume a clock is provided on pin RxClk/TxClk (clock mode 0a).
1215 * Clock mode 3b _should_ work but the testing seems to make this point
1216 * dubious (DIY testing requires setting CCR0 at 0x00000033).
1217 * This is supposed to provide least surprise "DTE like" behavior.
1218 * - if line rate is specified, clocks are assumed to be locally generated.
1219 * A quartz must be available (on pin XTAL1). Modes 6b/7b are used. Choosing
1220 * between these it automagically done according on the required frequency
1221 * scaling. Of course some rounding may take place.
1222 * - no high speed mode (40Mb/s). May be trivial to do but I don't have an
1223 * appropriate external clocking device for testing.
1224 * - no time-slot/clock mode 5: shameless laziness.
1225 *
1226 * The clock signals wiring can be (is ?) manufacturer dependent. Good luck.
1227 *
1228 * BIG FAT WARNING: if the device isn't provided enough clocking signal, it
1229 * won't pass the init sequence. For example, straight back-to-back DTE without
1230 * external clock will fail when dscc4_open() (<- 'ifconfig hdlcx xxx') is
1231 * called.
1232 *
1233 * Typos lurk in datasheet (missing divier in clock mode 7a figure 51 p.153
1234 * DS0 for example)
1235 *
1236 * Clock mode related bits of CCR0:
1237 * +------------ TOE: output TxClk (0b/2b/3a/3b/6b/7a/7b only)
1238 * | +---------- SSEL: sub-mode select 0 -> a, 1 -> b
1239 * | | +-------- High Speed: say 0
1240 * | | | +-+-+-- Clock Mode: 0..7
1241 * | | | | | |
1242 * -+-+-+-+-+-+-+-+
1243 * x|x|5|4|3|2|1|0| lower bits
1244 *
1245 * Division factor of BRR: k = (N+1)x2^M (total divider = 16xk in mode 6b)
1246 * +-+-+-+------------------ M (0..15)
1247 * | | | | +-+-+-+-+-+-- N (0..63)
1248 * 0 0 0 0 | | | | 0 0 | | | | | |
1249 * ...-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1250 * f|e|d|c|b|a|9|8|7|6|5|4|3|2|1|0| lower bits
1251 *
1252 */
1253 static int dscc4_set_clock(struct net_device *dev, u32 *bps, u32 *state)
1254 {
1255 struct dscc4_dev_priv *dpriv = dscc4_priv(dev);
1256 int ret = -1;
1257 u32 brr;
1258
1259 *state &= ~Ccr0ClockMask;
1260 if (*bps) { /* Clock generated - required for DCE */
1261 u32 n = 0, m = 0, divider;
1262 int xtal;
1263
1264 xtal = dpriv->pci_priv->xtal_hz;
1265 if (!xtal)
1266 goto done;
1267 if (dscc4_check_clock_ability(dpriv->dev_id) < 0)
1268 goto done;
1269 divider = xtal / *bps;
1270 if (divider > BRR_DIVIDER_MAX) {
1271 divider >>= 4;
1272 *state |= 0x00000036; /* Clock mode 6b (BRG/16) */
1273 } else
1274 *state |= 0x00000037; /* Clock mode 7b (BRG) */
1275 if (divider >> 22) {
1276 n = 63;
1277 m = 15;
1278 } else if (divider) {
1279 /* Extraction of the 6 highest weighted bits */
1280 m = 0;
1281 while (0xffffffc0 & divider) {
1282 m++;
1283 divider >>= 1;
1284 }
1285 n = divider;
1286 }
1287 brr = (m << 8) | n;
1288 divider = n << m;
1289 if (!(*state & 0x00000001)) /* ?b mode mask => clock mode 6b */
1290 divider <<= 4;
1291 *bps = xtal / divider;
1292 } else {
1293 /*
1294 * External clock - DTE
1295 * "state" already reflects Clock mode 0a (CCR0 = 0xzzzzzz00).
1296 * Nothing more to be done
1297 */
1298 brr = 0;
1299 }
1300 scc_writel(brr, dpriv, dev, BRR);
1301 ret = 0;
1302 done:
1303 return ret;
1304 }
1305
1306 static int dscc4_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1307 {
1308 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1309 struct dscc4_dev_priv *dpriv = dscc4_priv(dev);
1310 const size_t size = sizeof(dpriv->settings);
1311 int ret = 0;
1312
1313 if (dev->flags & IFF_UP)
1314 return -EBUSY;
1315
1316 if (cmd != SIOCWANDEV)
1317 return -EOPNOTSUPP;
1318
1319 switch(ifr->ifr_settings.type) {
1320 case IF_GET_IFACE:
1321 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1322 if (ifr->ifr_settings.size < size) {
1323 ifr->ifr_settings.size = size; /* data size wanted */
1324 return -ENOBUFS;
1325 }
1326 if (copy_to_user(line, &dpriv->settings, size))
1327 return -EFAULT;
1328 break;
1329
1330 case IF_IFACE_SYNC_SERIAL:
1331 if (!capable(CAP_NET_ADMIN))
1332 return -EPERM;
1333
1334 if (dpriv->flags & FakeReset) {
1335 netdev_info(dev, "please reset the device before this command\n");
1336 return -EPERM;
1337 }
1338 if (copy_from_user(&dpriv->settings, line, size))
1339 return -EFAULT;
1340 ret = dscc4_set_iface(dpriv, dev);
1341 break;
1342
1343 default:
1344 ret = hdlc_ioctl(dev, ifr, cmd);
1345 break;
1346 }
1347
1348 return ret;
1349 }
1350
1351 static int dscc4_match(const struct thingie *p, int value)
1352 {
1353 int i;
1354
1355 for (i = 0; p[i].define != -1; i++) {
1356 if (value == p[i].define)
1357 break;
1358 }
1359 if (p[i].define == -1)
1360 return -1;
1361 else
1362 return i;
1363 }
1364
1365 static int dscc4_clock_setting(struct dscc4_dev_priv *dpriv,
1366 struct net_device *dev)
1367 {
1368 sync_serial_settings *settings = &dpriv->settings;
1369 int ret = -EOPNOTSUPP;
1370 u32 bps, state;
1371
1372 bps = settings->clock_rate;
1373 state = scc_readl(dpriv, CCR0);
1374 if (dscc4_set_clock(dev, &bps, &state) < 0)
1375 goto done;
1376 if (bps) { /* DCE */
1377 printk(KERN_DEBUG "%s: generated RxClk (DCE)\n", dev->name);
1378 if (settings->clock_rate != bps) {
1379 printk(KERN_DEBUG "%s: clock adjusted (%08d -> %08d)\n",
1380 dev->name, settings->clock_rate, bps);
1381 settings->clock_rate = bps;
1382 }
1383 } else { /* DTE */
1384 state |= PowerUp | Vis;
1385 printk(KERN_DEBUG "%s: external RxClk (DTE)\n", dev->name);
1386 }
1387 scc_writel(state, dpriv, dev, CCR0);
1388 ret = 0;
1389 done:
1390 return ret;
1391 }
1392
1393 static int dscc4_encoding_setting(struct dscc4_dev_priv *dpriv,
1394 struct net_device *dev)
1395 {
1396 static const struct thingie encoding[] = {
1397 { ENCODING_NRZ, 0x00000000 },
1398 { ENCODING_NRZI, 0x00200000 },
1399 { ENCODING_FM_MARK, 0x00400000 },
1400 { ENCODING_FM_SPACE, 0x00500000 },
1401 { ENCODING_MANCHESTER, 0x00600000 },
1402 { -1, 0}
1403 };
1404 int i, ret = 0;
1405
1406 i = dscc4_match(encoding, dpriv->encoding);
1407 if (i >= 0)
1408 scc_patchl(EncodingMask, encoding[i].bits, dpriv, dev, CCR0);
1409 else
1410 ret = -EOPNOTSUPP;
1411 return ret;
1412 }
1413
1414 static int dscc4_loopback_setting(struct dscc4_dev_priv *dpriv,
1415 struct net_device *dev)
1416 {
1417 sync_serial_settings *settings = &dpriv->settings;
1418 u32 state;
1419
1420 state = scc_readl(dpriv, CCR1);
1421 if (settings->loopback) {
1422 printk(KERN_DEBUG "%s: loopback\n", dev->name);
1423 state |= 0x00000100;
1424 } else {
1425 printk(KERN_DEBUG "%s: normal\n", dev->name);
1426 state &= ~0x00000100;
1427 }
1428 scc_writel(state, dpriv, dev, CCR1);
1429 return 0;
1430 }
1431
1432 static int dscc4_crc_setting(struct dscc4_dev_priv *dpriv,
1433 struct net_device *dev)
1434 {
1435 static const struct thingie crc[] = {
1436 { PARITY_CRC16_PR0_CCITT, 0x00000010 },
1437 { PARITY_CRC16_PR1_CCITT, 0x00000000 },
1438 { PARITY_CRC32_PR0_CCITT, 0x00000011 },
1439 { PARITY_CRC32_PR1_CCITT, 0x00000001 }
1440 };
1441 int i, ret = 0;
1442
1443 i = dscc4_match(crc, dpriv->parity);
1444 if (i >= 0)
1445 scc_patchl(CrcMask, crc[i].bits, dpriv, dev, CCR1);
1446 else
1447 ret = -EOPNOTSUPP;
1448 return ret;
1449 }
1450
1451 static int dscc4_set_iface(struct dscc4_dev_priv *dpriv, struct net_device *dev)
1452 {
1453 struct {
1454 int (*action)(struct dscc4_dev_priv *, struct net_device *);
1455 } *p, do_setting[] = {
1456 { dscc4_encoding_setting },
1457 { dscc4_clock_setting },
1458 { dscc4_loopback_setting },
1459 { dscc4_crc_setting },
1460 { NULL }
1461 };
1462 int ret = 0;
1463
1464 for (p = do_setting; p->action; p++) {
1465 if ((ret = p->action(dpriv, dev)) < 0)
1466 break;
1467 }
1468 return ret;
1469 }
1470
1471 static irqreturn_t dscc4_irq(int irq, void *token)
1472 {
1473 struct dscc4_dev_priv *root = token;
1474 struct dscc4_pci_priv *priv;
1475 struct net_device *dev;
1476 void __iomem *ioaddr;
1477 u32 state;
1478 unsigned long flags;
1479 int i, handled = 1;
1480
1481 priv = root->pci_priv;
1482 dev = dscc4_to_dev(root);
1483
1484 spin_lock_irqsave(&priv->lock, flags);
1485
1486 ioaddr = root->base_addr;
1487
1488 state = readl(ioaddr + GSTAR);
1489 if (!state) {
1490 handled = 0;
1491 goto out;
1492 }
1493 if (debug > 3)
1494 printk(KERN_DEBUG "%s: GSTAR = 0x%08x\n", DRV_NAME, state);
1495 writel(state, ioaddr + GSTAR);
1496
1497 if (state & Arf) {
1498 netdev_err(dev, "failure (Arf). Harass the maintainer\n");
1499 goto out;
1500 }
1501 state &= ~ArAck;
1502 if (state & Cfg) {
1503 if (debug > 0)
1504 printk(KERN_DEBUG "%s: CfgIV\n", DRV_NAME);
1505 if (priv->iqcfg[priv->cfg_cur++%IRQ_RING_SIZE] & cpu_to_le32(Arf))
1506 netdev_err(dev, "CFG failed\n");
1507 if (!(state &= ~Cfg))
1508 goto out;
1509 }
1510 if (state & RxEvt) {
1511 i = dev_per_card - 1;
1512 do {
1513 dscc4_rx_irq(priv, root + i);
1514 } while (--i >= 0);
1515 state &= ~RxEvt;
1516 }
1517 if (state & TxEvt) {
1518 i = dev_per_card - 1;
1519 do {
1520 dscc4_tx_irq(priv, root + i);
1521 } while (--i >= 0);
1522 state &= ~TxEvt;
1523 }
1524 out:
1525 spin_unlock_irqrestore(&priv->lock, flags);
1526 return IRQ_RETVAL(handled);
1527 }
1528
1529 static void dscc4_tx_irq(struct dscc4_pci_priv *ppriv,
1530 struct dscc4_dev_priv *dpriv)
1531 {
1532 struct net_device *dev = dscc4_to_dev(dpriv);
1533 u32 state;
1534 int cur, loop = 0;
1535
1536 try:
1537 cur = dpriv->iqtx_current%IRQ_RING_SIZE;
1538 state = le32_to_cpu(dpriv->iqtx[cur]);
1539 if (!state) {
1540 if (debug > 4)
1541 printk(KERN_DEBUG "%s: Tx ISR = 0x%08x\n", dev->name,
1542 state);
1543 if ((debug > 1) && (loop > 1))
1544 printk(KERN_DEBUG "%s: Tx irq loop=%d\n", dev->name, loop);
1545 if (loop && netif_queue_stopped(dev))
1546 if ((dpriv->tx_current - dpriv->tx_dirty)%TX_RING_SIZE)
1547 netif_wake_queue(dev);
1548
1549 if (netif_running(dev) && dscc4_tx_quiescent(dpriv, dev) &&
1550 !dscc4_tx_done(dpriv))
1551 dscc4_do_tx(dpriv, dev);
1552 return;
1553 }
1554 loop++;
1555 dpriv->iqtx[cur] = 0;
1556 dpriv->iqtx_current++;
1557
1558 if (state_check(state, dpriv, dev, "Tx") < 0)
1559 return;
1560
1561 if (state & SccEvt) {
1562 if (state & Alls) {
1563 struct sk_buff *skb;
1564 struct TxFD *tx_fd;
1565
1566 if (debug > 2)
1567 dscc4_tx_print(dev, dpriv, "Alls");
1568 /*
1569 * DataComplete can't be trusted for Tx completion.
1570 * Cf errata DS5 p.8
1571 */
1572 cur = dpriv->tx_dirty%TX_RING_SIZE;
1573 tx_fd = dpriv->tx_fd + cur;
1574 skb = dpriv->tx_skbuff[cur];
1575 if (skb) {
1576 pci_unmap_single(ppriv->pdev, le32_to_cpu(tx_fd->data),
1577 skb->len, PCI_DMA_TODEVICE);
1578 if (tx_fd->state & FrameEnd) {
1579 dev->stats.tx_packets++;
1580 dev->stats.tx_bytes += skb->len;
1581 }
1582 dev_kfree_skb_irq(skb);
1583 dpriv->tx_skbuff[cur] = NULL;
1584 ++dpriv->tx_dirty;
1585 } else {
1586 if (debug > 1)
1587 netdev_err(dev, "Tx: NULL skb %d\n",
1588 cur);
1589 }
1590 /*
1591 * If the driver ends sending crap on the wire, it
1592 * will be way easier to diagnose than the (not so)
1593 * random freeze induced by null sized tx frames.
1594 */
1595 tx_fd->data = tx_fd->next;
1596 tx_fd->state = FrameEnd | TO_STATE_TX(2*DUMMY_SKB_SIZE);
1597 tx_fd->complete = 0x00000000;
1598 tx_fd->jiffies = 0;
1599
1600 if (!(state &= ~Alls))
1601 goto try;
1602 }
1603 /*
1604 * Transmit Data Underrun
1605 */
1606 if (state & Xdu) {
1607 netdev_err(dev, "Tx Data Underrun. Ask maintainer\n");
1608 dpriv->flags = NeedIDT;
1609 /* Tx reset */
1610 writel(MTFi | Rdt,
1611 dpriv->base_addr + 0x0c*dpriv->dev_id + CH0CFG);
1612 writel(Action, dpriv->base_addr + GCMDR);
1613 return;
1614 }
1615 if (state & Cts) {
1616 netdev_info(dev, "CTS transition\n");
1617 if (!(state &= ~Cts)) /* DEBUG */
1618 goto try;
1619 }
1620 if (state & Xmr) {
1621 /* Frame needs to be sent again - FIXME */
1622 netdev_err(dev, "Tx ReTx. Ask maintainer\n");
1623 if (!(state &= ~Xmr)) /* DEBUG */
1624 goto try;
1625 }
1626 if (state & Xpr) {
1627 void __iomem *scc_addr;
1628 unsigned long ring;
1629 int i;
1630
1631 /*
1632 * - the busy condition happens (sometimes);
1633 * - it doesn't seem to make the handler unreliable.
1634 */
1635 for (i = 1; i; i <<= 1) {
1636 if (!(scc_readl_star(dpriv, dev) & SccBusy))
1637 break;
1638 }
1639 if (!i)
1640 netdev_info(dev, "busy in irq\n");
1641
1642 scc_addr = dpriv->base_addr + 0x0c*dpriv->dev_id;
1643 /* Keep this order: IDT before IDR */
1644 if (dpriv->flags & NeedIDT) {
1645 if (debug > 2)
1646 dscc4_tx_print(dev, dpriv, "Xpr");
1647 ring = dpriv->tx_fd_dma +
1648 (dpriv->tx_dirty%TX_RING_SIZE)*
1649 sizeof(struct TxFD);
1650 writel(ring, scc_addr + CH0BTDA);
1651 dscc4_do_tx(dpriv, dev);
1652 writel(MTFi | Idt, scc_addr + CH0CFG);
1653 if (dscc4_do_action(dev, "IDT") < 0)
1654 goto err_xpr;
1655 dpriv->flags &= ~NeedIDT;
1656 }
1657 if (dpriv->flags & NeedIDR) {
1658 ring = dpriv->rx_fd_dma +
1659 (dpriv->rx_current%RX_RING_SIZE)*
1660 sizeof(struct RxFD);
1661 writel(ring, scc_addr + CH0BRDA);
1662 dscc4_rx_update(dpriv, dev);
1663 writel(MTFi | Idr, scc_addr + CH0CFG);
1664 if (dscc4_do_action(dev, "IDR") < 0)
1665 goto err_xpr;
1666 dpriv->flags &= ~NeedIDR;
1667 smp_wmb();
1668 /* Activate receiver and misc */
1669 scc_writel(0x08050008, dpriv, dev, CCR2);
1670 }
1671 err_xpr:
1672 if (!(state &= ~Xpr))
1673 goto try;
1674 }
1675 if (state & Cd) {
1676 if (debug > 0)
1677 netdev_info(dev, "CD transition\n");
1678 if (!(state &= ~Cd)) /* DEBUG */
1679 goto try;
1680 }
1681 } else { /* ! SccEvt */
1682 if (state & Hi) {
1683 #ifdef DSCC4_POLLING
1684 while (!dscc4_tx_poll(dpriv, dev));
1685 #endif
1686 netdev_info(dev, "Tx Hi\n");
1687 state &= ~Hi;
1688 }
1689 if (state & Err) {
1690 netdev_info(dev, "Tx ERR\n");
1691 dev->stats.tx_errors++;
1692 state &= ~Err;
1693 }
1694 }
1695 goto try;
1696 }
1697
1698 static void dscc4_rx_irq(struct dscc4_pci_priv *priv,
1699 struct dscc4_dev_priv *dpriv)
1700 {
1701 struct net_device *dev = dscc4_to_dev(dpriv);
1702 u32 state;
1703 int cur;
1704
1705 try:
1706 cur = dpriv->iqrx_current%IRQ_RING_SIZE;
1707 state = le32_to_cpu(dpriv->iqrx[cur]);
1708 if (!state)
1709 return;
1710 dpriv->iqrx[cur] = 0;
1711 dpriv->iqrx_current++;
1712
1713 if (state_check(state, dpriv, dev, "Rx") < 0)
1714 return;
1715
1716 if (!(state & SccEvt)){
1717 struct RxFD *rx_fd;
1718
1719 if (debug > 4)
1720 printk(KERN_DEBUG "%s: Rx ISR = 0x%08x\n", dev->name,
1721 state);
1722 state &= 0x00ffffff;
1723 if (state & Err) { /* Hold or reset */
1724 printk(KERN_DEBUG "%s: Rx ERR\n", dev->name);
1725 cur = dpriv->rx_current%RX_RING_SIZE;
1726 rx_fd = dpriv->rx_fd + cur;
1727 /*
1728 * Presume we're not facing a DMAC receiver reset.
1729 * As We use the rx size-filtering feature of the
1730 * DSCC4, the beginning of a new frame is waiting in
1731 * the rx fifo. I bet a Receive Data Overflow will
1732 * happen most of time but let's try and avoid it.
1733 * Btw (as for RDO) if one experiences ERR whereas
1734 * the system looks rather idle, there may be a
1735 * problem with latency. In this case, increasing
1736 * RX_RING_SIZE may help.
1737 */
1738 //while (dpriv->rx_needs_refill) {
1739 while (!(rx_fd->state1 & Hold)) {
1740 rx_fd++;
1741 cur++;
1742 if (!(cur = cur%RX_RING_SIZE))
1743 rx_fd = dpriv->rx_fd;
1744 }
1745 //dpriv->rx_needs_refill--;
1746 try_get_rx_skb(dpriv, dev);
1747 if (!rx_fd->data)
1748 goto try;
1749 rx_fd->state1 &= ~Hold;
1750 rx_fd->state2 = 0x00000000;
1751 rx_fd->end = cpu_to_le32(0xbabeface);
1752 //}
1753 goto try;
1754 }
1755 if (state & Fi) {
1756 dscc4_rx_skb(dpriv, dev);
1757 goto try;
1758 }
1759 if (state & Hi ) { /* HI bit */
1760 netdev_info(dev, "Rx Hi\n");
1761 state &= ~Hi;
1762 goto try;
1763 }
1764 } else { /* SccEvt */
1765 if (debug > 1) {
1766 //FIXME: verifier la presence de tous les evenements
1767 static struct {
1768 u32 mask;
1769 const char *irq_name;
1770 } evts[] = {
1771 { 0x00008000, "TIN"},
1772 { 0x00000020, "RSC"},
1773 { 0x00000010, "PCE"},
1774 { 0x00000008, "PLLA"},
1775 { 0, NULL}
1776 }, *evt;
1777
1778 for (evt = evts; evt->irq_name; evt++) {
1779 if (state & evt->mask) {
1780 printk(KERN_DEBUG "%s: %s\n",
1781 dev->name, evt->irq_name);
1782 if (!(state &= ~evt->mask))
1783 goto try;
1784 }
1785 }
1786 } else {
1787 if (!(state &= ~0x0000c03c))
1788 goto try;
1789 }
1790 if (state & Cts) {
1791 netdev_info(dev, "CTS transition\n");
1792 if (!(state &= ~Cts)) /* DEBUG */
1793 goto try;
1794 }
1795 /*
1796 * Receive Data Overflow (FIXME: fscked)
1797 */
1798 if (state & Rdo) {
1799 struct RxFD *rx_fd;
1800 void __iomem *scc_addr;
1801 int cur;
1802
1803 //if (debug)
1804 // dscc4_rx_dump(dpriv);
1805 scc_addr = dpriv->base_addr + 0x0c*dpriv->dev_id;
1806
1807 scc_patchl(RxActivate, 0, dpriv, dev, CCR2);
1808 /*
1809 * This has no effect. Why ?
1810 * ORed with TxSccRes, one sees the CFG ack (for
1811 * the TX part only).
1812 */
1813 scc_writel(RxSccRes, dpriv, dev, CMDR);
1814 dpriv->flags |= RdoSet;
1815
1816 /*
1817 * Let's try and save something in the received data.
1818 * rx_current must be incremented at least once to
1819 * avoid HOLD in the BRDA-to-be-pointed desc.
1820 */
1821 do {
1822 cur = dpriv->rx_current++%RX_RING_SIZE;
1823 rx_fd = dpriv->rx_fd + cur;
1824 if (!(rx_fd->state2 & DataComplete))
1825 break;
1826 if (rx_fd->state2 & FrameAborted) {
1827 dev->stats.rx_over_errors++;
1828 rx_fd->state1 |= Hold;
1829 rx_fd->state2 = 0x00000000;
1830 rx_fd->end = cpu_to_le32(0xbabeface);
1831 } else
1832 dscc4_rx_skb(dpriv, dev);
1833 } while (1);
1834
1835 if (debug > 0) {
1836 if (dpriv->flags & RdoSet)
1837 printk(KERN_DEBUG
1838 "%s: no RDO in Rx data\n", DRV_NAME);
1839 }
1840 #ifdef DSCC4_RDO_EXPERIMENTAL_RECOVERY
1841 /*
1842 * FIXME: must the reset be this violent ?
1843 */
1844 #warning "FIXME: CH0BRDA"
1845 writel(dpriv->rx_fd_dma +
1846 (dpriv->rx_current%RX_RING_SIZE)*
1847 sizeof(struct RxFD), scc_addr + CH0BRDA);
1848 writel(MTFi|Rdr|Idr, scc_addr + CH0CFG);
1849 if (dscc4_do_action(dev, "RDR") < 0) {
1850 netdev_err(dev, "RDO recovery failed(RDR)\n");
1851 goto rdo_end;
1852 }
1853 writel(MTFi|Idr, scc_addr + CH0CFG);
1854 if (dscc4_do_action(dev, "IDR") < 0) {
1855 netdev_err(dev, "RDO recovery failed(IDR)\n");
1856 goto rdo_end;
1857 }
1858 rdo_end:
1859 #endif
1860 scc_patchl(0, RxActivate, dpriv, dev, CCR2);
1861 goto try;
1862 }
1863 if (state & Cd) {
1864 netdev_info(dev, "CD transition\n");
1865 if (!(state &= ~Cd)) /* DEBUG */
1866 goto try;
1867 }
1868 if (state & Flex) {
1869 printk(KERN_DEBUG "%s: Flex. Ttttt...\n", DRV_NAME);
1870 if (!(state &= ~Flex))
1871 goto try;
1872 }
1873 }
1874 }
1875
1876 /*
1877 * I had expected the following to work for the first descriptor
1878 * (tx_fd->state = 0xc0000000)
1879 * - Hold=1 (don't try and branch to the next descripto);
1880 * - No=0 (I want an empty data section, i.e. size=0);
1881 * - Fe=1 (required by No=0 or we got an Err irq and must reset).
1882 * It failed and locked solid. Thus the introduction of a dummy skb.
1883 * Problem is acknowledged in errata sheet DS5. Joy :o/
1884 */
1885 static struct sk_buff *dscc4_init_dummy_skb(struct dscc4_dev_priv *dpriv)
1886 {
1887 struct sk_buff *skb;
1888
1889 skb = dev_alloc_skb(DUMMY_SKB_SIZE);
1890 if (skb) {
1891 int last = dpriv->tx_dirty%TX_RING_SIZE;
1892 struct TxFD *tx_fd = dpriv->tx_fd + last;
1893
1894 skb->len = DUMMY_SKB_SIZE;
1895 skb_copy_to_linear_data(skb, version,
1896 strlen(version) % DUMMY_SKB_SIZE);
1897 tx_fd->state = FrameEnd | TO_STATE_TX(DUMMY_SKB_SIZE);
1898 tx_fd->data = cpu_to_le32(pci_map_single(dpriv->pci_priv->pdev,
1899 skb->data, DUMMY_SKB_SIZE,
1900 PCI_DMA_TODEVICE));
1901 dpriv->tx_skbuff[last] = skb;
1902 }
1903 return skb;
1904 }
1905
1906 static int dscc4_init_ring(struct net_device *dev)
1907 {
1908 struct dscc4_dev_priv *dpriv = dscc4_priv(dev);
1909 struct pci_dev *pdev = dpriv->pci_priv->pdev;
1910 struct TxFD *tx_fd;
1911 struct RxFD *rx_fd;
1912 void *ring;
1913 int i;
1914
1915 ring = pci_alloc_consistent(pdev, RX_TOTAL_SIZE, &dpriv->rx_fd_dma);
1916 if (!ring)
1917 goto err_out;
1918 dpriv->rx_fd = rx_fd = (struct RxFD *) ring;
1919
1920 ring = pci_alloc_consistent(pdev, TX_TOTAL_SIZE, &dpriv->tx_fd_dma);
1921 if (!ring)
1922 goto err_free_dma_rx;
1923 dpriv->tx_fd = tx_fd = (struct TxFD *) ring;
1924
1925 memset(dpriv->tx_skbuff, 0, sizeof(struct sk_buff *)*TX_RING_SIZE);
1926 dpriv->tx_dirty = 0xffffffff;
1927 i = dpriv->tx_current = 0;
1928 do {
1929 tx_fd->state = FrameEnd | TO_STATE_TX(2*DUMMY_SKB_SIZE);
1930 tx_fd->complete = 0x00000000;
1931 /* FIXME: NULL should be ok - to be tried */
1932 tx_fd->data = cpu_to_le32(dpriv->tx_fd_dma);
1933 (tx_fd++)->next = cpu_to_le32(dpriv->tx_fd_dma +
1934 (++i%TX_RING_SIZE)*sizeof(*tx_fd));
1935 } while (i < TX_RING_SIZE);
1936
1937 if (!dscc4_init_dummy_skb(dpriv))
1938 goto err_free_dma_tx;
1939
1940 memset(dpriv->rx_skbuff, 0, sizeof(struct sk_buff *)*RX_RING_SIZE);
1941 i = dpriv->rx_dirty = dpriv->rx_current = 0;
1942 do {
1943 /* size set by the host. Multiple of 4 bytes please */
1944 rx_fd->state1 = HiDesc;
1945 rx_fd->state2 = 0x00000000;
1946 rx_fd->end = cpu_to_le32(0xbabeface);
1947 rx_fd->state1 |= TO_STATE_RX(HDLC_MAX_MRU);
1948 // FIXME: return value verifiee mais traitement suspect
1949 if (try_get_rx_skb(dpriv, dev) >= 0)
1950 dpriv->rx_dirty++;
1951 (rx_fd++)->next = cpu_to_le32(dpriv->rx_fd_dma +
1952 (++i%RX_RING_SIZE)*sizeof(*rx_fd));
1953 } while (i < RX_RING_SIZE);
1954
1955 return 0;
1956
1957 err_free_dma_tx:
1958 pci_free_consistent(pdev, TX_TOTAL_SIZE, ring, dpriv->tx_fd_dma);
1959 err_free_dma_rx:
1960 pci_free_consistent(pdev, RX_TOTAL_SIZE, rx_fd, dpriv->rx_fd_dma);
1961 err_out:
1962 return -ENOMEM;
1963 }
1964
1965 static void dscc4_remove_one(struct pci_dev *pdev)
1966 {
1967 struct dscc4_pci_priv *ppriv;
1968 struct dscc4_dev_priv *root;
1969 void __iomem *ioaddr;
1970 int i;
1971
1972 ppriv = pci_get_drvdata(pdev);
1973 root = ppriv->root;
1974
1975 ioaddr = root->base_addr;
1976
1977 dscc4_pci_reset(pdev, ioaddr);
1978
1979 free_irq(pdev->irq, root);
1980 pci_free_consistent(pdev, IRQ_RING_SIZE*sizeof(u32), ppriv->iqcfg,
1981 ppriv->iqcfg_dma);
1982 for (i = 0; i < dev_per_card; i++) {
1983 struct dscc4_dev_priv *dpriv = root + i;
1984
1985 dscc4_release_ring(dpriv);
1986 pci_free_consistent(pdev, IRQ_RING_SIZE*sizeof(u32),
1987 dpriv->iqrx, dpriv->iqrx_dma);
1988 pci_free_consistent(pdev, IRQ_RING_SIZE*sizeof(u32),
1989 dpriv->iqtx, dpriv->iqtx_dma);
1990 }
1991
1992 dscc4_free1(pdev);
1993
1994 iounmap(ioaddr);
1995
1996 pci_release_region(pdev, 1);
1997 pci_release_region(pdev, 0);
1998
1999 pci_disable_device(pdev);
2000 }
2001
2002 static int dscc4_hdlc_attach(struct net_device *dev, unsigned short encoding,
2003 unsigned short parity)
2004 {
2005 struct dscc4_dev_priv *dpriv = dscc4_priv(dev);
2006
2007 if (encoding != ENCODING_NRZ &&
2008 encoding != ENCODING_NRZI &&
2009 encoding != ENCODING_FM_MARK &&
2010 encoding != ENCODING_FM_SPACE &&
2011 encoding != ENCODING_MANCHESTER)
2012 return -EINVAL;
2013
2014 if (parity != PARITY_NONE &&
2015 parity != PARITY_CRC16_PR0_CCITT &&
2016 parity != PARITY_CRC16_PR1_CCITT &&
2017 parity != PARITY_CRC32_PR0_CCITT &&
2018 parity != PARITY_CRC32_PR1_CCITT)
2019 return -EINVAL;
2020
2021 dpriv->encoding = encoding;
2022 dpriv->parity = parity;
2023 return 0;
2024 }
2025
2026 #ifndef MODULE
2027 static int __init dscc4_setup(char *str)
2028 {
2029 int *args[] = { &debug, &quartz, NULL }, **p = args;
2030
2031 while (*p && (get_option(&str, *p) == 2))
2032 p++;
2033 return 1;
2034 }
2035
2036 __setup("dscc4.setup=", dscc4_setup);
2037 #endif
2038
2039 static const struct pci_device_id dscc4_pci_tbl[] = {
2040 { PCI_VENDOR_ID_SIEMENS, PCI_DEVICE_ID_SIEMENS_DSCC4,
2041 PCI_ANY_ID, PCI_ANY_ID, },
2042 { 0,}
2043 };
2044 MODULE_DEVICE_TABLE(pci, dscc4_pci_tbl);
2045
2046 static struct pci_driver dscc4_driver = {
2047 .name = DRV_NAME,
2048 .id_table = dscc4_pci_tbl,
2049 .probe = dscc4_init_one,
2050 .remove = dscc4_remove_one,
2051 };
2052
2053 module_pci_driver(dscc4_driver);
Linux with added FPC-III support