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Merge tag 'for-linus-20190706' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / net / hamradio / yam.c
blob71cdef9fb56bc93874c1984c2c995343cd065a45
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*****************************************************************************/
3
4 /*
5 * yam.c -- YAM radio modem driver.
6 *
7 * Copyright (C) 1998 Frederic Rible F1OAT (frible@teaser.fr)
8 * Adapted from baycom.c driver written by Thomas Sailer (sailer@ife.ee.ethz.ch)
9 *
10 * Please note that the GPL allows you to use the driver, NOT the radio.
11 * In order to use the radio, you need a license from the communications
12 * authority of your country.
13 *
14 * History:
15 * 0.0 F1OAT 06.06.98 Begin of work with baycom.c source code V 0.3
16 * 0.1 F1OAT 07.06.98 Add timer polling routine for channel arbitration
17 * 0.2 F6FBB 08.06.98 Added delay after FPGA programming
18 * 0.3 F6FBB 29.07.98 Delayed PTT implementation for dupmode=2
19 * 0.4 F6FBB 30.07.98 Added TxTail, Slottime and Persistence
20 * 0.5 F6FBB 01.08.98 Shared IRQs, /proc/net and network statistics
21 * 0.6 F6FBB 25.08.98 Added 1200Bds format
22 * 0.7 F6FBB 12.09.98 Added to the kernel configuration
23 * 0.8 F6FBB 14.10.98 Fixed slottime/persistence timing bug
24 * OK1ZIA 2.09.01 Fixed "kfree_skb on hard IRQ"
25 * using dev_kfree_skb_any(). (important in 2.4 kernel)
26 */
27
28 /*****************************************************************************/
29
30 #include <linux/module.h>
31 #include <linux/types.h>
32 #include <linux/net.h>
33 #include <linux/in.h>
34 #include <linux/if.h>
35 #include <linux/slab.h>
36 #include <linux/errno.h>
37 #include <linux/bitops.h>
38 #include <linux/random.h>
39 #include <asm/io.h>
40 #include <linux/interrupt.h>
41 #include <linux/ioport.h>
42 #include <linux/firmware.h>
43 #include <linux/platform_device.h>
44
45 #include <linux/netdevice.h>
46 #include <linux/if_arp.h>
47 #include <linux/etherdevice.h>
48 #include <linux/skbuff.h>
49 #include <net/ax25.h>
50
51 #include <linux/kernel.h>
52 #include <linux/proc_fs.h>
53 #include <linux/seq_file.h>
54 #include <net/net_namespace.h>
55
56 #include <linux/uaccess.h>
57 #include <linux/init.h>
58
59 #include <linux/yam.h>
60
61 /* --------------------------------------------------------------------- */
62
63 static const char yam_drvname[] = "yam";
64 static const char yam_drvinfo[] __initconst = KERN_INFO \
65 "YAM driver version 0.8 by F1OAT/F6FBB\n";
66
67 /* --------------------------------------------------------------------- */
68
69 #define FIRMWARE_9600 "yam/9600.bin"
70 #define FIRMWARE_1200 "yam/1200.bin"
71
72 #define YAM_9600 1
73 #define YAM_1200 2
74
75 #define NR_PORTS 4
76 #define YAM_MAGIC 0xF10A7654
77
78 /* Transmitter states */
79
80 #define TX_OFF 0
81 #define TX_HEAD 1
82 #define TX_DATA 2
83 #define TX_CRC1 3
84 #define TX_CRC2 4
85 #define TX_TAIL 5
86
87 #define YAM_MAX_FRAME 1024
88
89 #define DEFAULT_BITRATE 9600 /* bps */
90 #define DEFAULT_HOLDD 10 /* sec */
91 #define DEFAULT_TXD 300 /* ms */
92 #define DEFAULT_TXTAIL 10 /* ms */
93 #define DEFAULT_SLOT 100 /* ms */
94 #define DEFAULT_PERS 64 /* 0->255 */
95
96 struct yam_port {
97 int magic;
98 int bitrate;
99 int baudrate;
100 int iobase;
101 int irq;
102 int dupmode;
103
104 struct net_device *dev;
105
106 int nb_rxint;
107 int nb_mdint;
108
109 /* Parameters section */
110
111 int txd; /* tx delay */
112 int holdd; /* duplex ptt delay */
113 int txtail; /* txtail delay */
114 int slot; /* slottime */
115 int pers; /* persistence */
116
117 /* Tx section */
118
119 int tx_state;
120 int tx_count;
121 int slotcnt;
122 unsigned char tx_buf[YAM_MAX_FRAME];
123 int tx_len;
124 int tx_crcl, tx_crch;
125 struct sk_buff_head send_queue; /* Packets awaiting transmission */
126
127 /* Rx section */
128
129 int dcd;
130 unsigned char rx_buf[YAM_MAX_FRAME];
131 int rx_len;
132 int rx_crcl, rx_crch;
133 };
134
135 struct yam_mcs {
136 unsigned char bits[YAM_FPGA_SIZE];
137 int bitrate;
138 struct yam_mcs *next;
139 };
140
141 static struct net_device *yam_devs[NR_PORTS];
142
143 static struct yam_mcs *yam_data;
144
145 static DEFINE_TIMER(yam_timer, NULL);
146
147 /* --------------------------------------------------------------------- */
148
149 #define RBR(iobase) (iobase+0)
150 #define THR(iobase) (iobase+0)
151 #define IER(iobase) (iobase+1)
152 #define IIR(iobase) (iobase+2)
153 #define FCR(iobase) (iobase+2)
154 #define LCR(iobase) (iobase+3)
155 #define MCR(iobase) (iobase+4)
156 #define LSR(iobase) (iobase+5)
157 #define MSR(iobase) (iobase+6)
158 #define SCR(iobase) (iobase+7)
159 #define DLL(iobase) (iobase+0)
160 #define DLM(iobase) (iobase+1)
161
162 #define YAM_EXTENT 8
163
164 /* Interrupt Identification Register Bit Masks */
165 #define IIR_NOPEND 1
166 #define IIR_MSR 0
167 #define IIR_TX 2
168 #define IIR_RX 4
169 #define IIR_LSR 6
170 #define IIR_TIMEOUT 12 /* Fifo mode only */
171
172 #define IIR_MASK 0x0F
173
174 /* Interrupt Enable Register Bit Masks */
175 #define IER_RX 1 /* enable rx interrupt */
176 #define IER_TX 2 /* enable tx interrupt */
177 #define IER_LSR 4 /* enable line status interrupts */
178 #define IER_MSR 8 /* enable modem status interrupts */
179
180 /* Modem Control Register Bit Masks */
181 #define MCR_DTR 0x01 /* DTR output */
182 #define MCR_RTS 0x02 /* RTS output */
183 #define MCR_OUT1 0x04 /* OUT1 output (not accessible in RS232) */
184 #define MCR_OUT2 0x08 /* Master Interrupt enable (must be set on PCs) */
185 #define MCR_LOOP 0x10 /* Loopback enable */
186
187 /* Modem Status Register Bit Masks */
188 #define MSR_DCTS 0x01 /* Delta CTS input */
189 #define MSR_DDSR 0x02 /* Delta DSR */
190 #define MSR_DRIN 0x04 /* Delta RI */
191 #define MSR_DDCD 0x08 /* Delta DCD */
192 #define MSR_CTS 0x10 /* CTS input */
193 #define MSR_DSR 0x20 /* DSR input */
194 #define MSR_RING 0x40 /* RI input */
195 #define MSR_DCD 0x80 /* DCD input */
196
197 /* line status register bit mask */
198 #define LSR_RXC 0x01
199 #define LSR_OE 0x02
200 #define LSR_PE 0x04
201 #define LSR_FE 0x08
202 #define LSR_BREAK 0x10
203 #define LSR_THRE 0x20
204 #define LSR_TSRE 0x40
205
206 /* Line Control Register Bit Masks */
207 #define LCR_DLAB 0x80
208 #define LCR_BREAK 0x40
209 #define LCR_PZERO 0x28
210 #define LCR_PEVEN 0x18
211 #define LCR_PODD 0x08
212 #define LCR_STOP1 0x00
213 #define LCR_STOP2 0x04
214 #define LCR_BIT5 0x00
215 #define LCR_BIT6 0x02
216 #define LCR_BIT7 0x01
217 #define LCR_BIT8 0x03
218
219 /* YAM Modem <-> UART Port mapping */
220
221 #define TX_RDY MSR_DCTS /* transmitter ready to send */
222 #define RX_DCD MSR_DCD /* carrier detect */
223 #define RX_FLAG MSR_RING /* hdlc flag received */
224 #define FPGA_DONE MSR_DSR /* FPGA is configured */
225 #define PTT_ON (MCR_RTS|MCR_OUT2) /* activate PTT */
226 #define PTT_OFF (MCR_DTR|MCR_OUT2) /* release PTT */
227
228 #define ENABLE_RXINT IER_RX /* enable uart rx interrupt during rx */
229 #define ENABLE_TXINT IER_MSR /* enable uart ms interrupt during tx */
230 #define ENABLE_RTXINT (IER_RX|IER_MSR) /* full duplex operations */
231
232
233 /*************************************************************************
234 * CRC Tables
235 ************************************************************************/
236
237 static const unsigned char chktabl[256] =
238 {0x00, 0x89, 0x12, 0x9b, 0x24, 0xad, 0x36, 0xbf, 0x48, 0xc1, 0x5a, 0xd3, 0x6c, 0xe5, 0x7e,
239 0xf7, 0x81, 0x08, 0x93, 0x1a, 0xa5, 0x2c, 0xb7, 0x3e, 0xc9, 0x40, 0xdb, 0x52, 0xed, 0x64,
240 0xff, 0x76, 0x02, 0x8b, 0x10, 0x99, 0x26, 0xaf, 0x34, 0xbd, 0x4a, 0xc3, 0x58, 0xd1, 0x6e,
241 0xe7, 0x7c, 0xf5, 0x83, 0x0a, 0x91, 0x18, 0xa7, 0x2e, 0xb5, 0x3c, 0xcb, 0x42, 0xd9, 0x50,
242 0xef, 0x66, 0xfd, 0x74, 0x04, 0x8d, 0x16, 0x9f, 0x20, 0xa9, 0x32, 0xbb, 0x4c, 0xc5, 0x5e,
243 0xd7, 0x68, 0xe1, 0x7a, 0xf3, 0x85, 0x0c, 0x97, 0x1e, 0xa1, 0x28, 0xb3, 0x3a, 0xcd, 0x44,
244 0xdf, 0x56, 0xe9, 0x60, 0xfb, 0x72, 0x06, 0x8f, 0x14, 0x9d, 0x22, 0xab, 0x30, 0xb9, 0x4e,
245 0xc7, 0x5c, 0xd5, 0x6a, 0xe3, 0x78, 0xf1, 0x87, 0x0e, 0x95, 0x1c, 0xa3, 0x2a, 0xb1, 0x38,
246 0xcf, 0x46, 0xdd, 0x54, 0xeb, 0x62, 0xf9, 0x70, 0x08, 0x81, 0x1a, 0x93, 0x2c, 0xa5, 0x3e,
247 0xb7, 0x40, 0xc9, 0x52, 0xdb, 0x64, 0xed, 0x76, 0xff, 0x89, 0x00, 0x9b, 0x12, 0xad, 0x24,
248 0xbf, 0x36, 0xc1, 0x48, 0xd3, 0x5a, 0xe5, 0x6c, 0xf7, 0x7e, 0x0a, 0x83, 0x18, 0x91, 0x2e,
249 0xa7, 0x3c, 0xb5, 0x42, 0xcb, 0x50, 0xd9, 0x66, 0xef, 0x74, 0xfd, 0x8b, 0x02, 0x99, 0x10,
250 0xaf, 0x26, 0xbd, 0x34, 0xc3, 0x4a, 0xd1, 0x58, 0xe7, 0x6e, 0xf5, 0x7c, 0x0c, 0x85, 0x1e,
251 0x97, 0x28, 0xa1, 0x3a, 0xb3, 0x44, 0xcd, 0x56, 0xdf, 0x60, 0xe9, 0x72, 0xfb, 0x8d, 0x04,
252 0x9f, 0x16, 0xa9, 0x20, 0xbb, 0x32, 0xc5, 0x4c, 0xd7, 0x5e, 0xe1, 0x68, 0xf3, 0x7a, 0x0e,
253 0x87, 0x1c, 0x95, 0x2a, 0xa3, 0x38, 0xb1, 0x46, 0xcf, 0x54, 0xdd, 0x62, 0xeb, 0x70, 0xf9,
254 0x8f, 0x06, 0x9d, 0x14, 0xab, 0x22, 0xb9, 0x30, 0xc7, 0x4e, 0xd5, 0x5c, 0xe3, 0x6a, 0xf1,
255 0x78};
256 static const unsigned char chktabh[256] =
257 {0x00, 0x11, 0x23, 0x32, 0x46, 0x57, 0x65, 0x74, 0x8c, 0x9d, 0xaf, 0xbe, 0xca, 0xdb, 0xe9,
258 0xf8, 0x10, 0x01, 0x33, 0x22, 0x56, 0x47, 0x75, 0x64, 0x9c, 0x8d, 0xbf, 0xae, 0xda, 0xcb,
259 0xf9, 0xe8, 0x21, 0x30, 0x02, 0x13, 0x67, 0x76, 0x44, 0x55, 0xad, 0xbc, 0x8e, 0x9f, 0xeb,
260 0xfa, 0xc8, 0xd9, 0x31, 0x20, 0x12, 0x03, 0x77, 0x66, 0x54, 0x45, 0xbd, 0xac, 0x9e, 0x8f,
261 0xfb, 0xea, 0xd8, 0xc9, 0x42, 0x53, 0x61, 0x70, 0x04, 0x15, 0x27, 0x36, 0xce, 0xdf, 0xed,
262 0xfc, 0x88, 0x99, 0xab, 0xba, 0x52, 0x43, 0x71, 0x60, 0x14, 0x05, 0x37, 0x26, 0xde, 0xcf,
263 0xfd, 0xec, 0x98, 0x89, 0xbb, 0xaa, 0x63, 0x72, 0x40, 0x51, 0x25, 0x34, 0x06, 0x17, 0xef,
264 0xfe, 0xcc, 0xdd, 0xa9, 0xb8, 0x8a, 0x9b, 0x73, 0x62, 0x50, 0x41, 0x35, 0x24, 0x16, 0x07,
265 0xff, 0xee, 0xdc, 0xcd, 0xb9, 0xa8, 0x9a, 0x8b, 0x84, 0x95, 0xa7, 0xb6, 0xc2, 0xd3, 0xe1,
266 0xf0, 0x08, 0x19, 0x2b, 0x3a, 0x4e, 0x5f, 0x6d, 0x7c, 0x94, 0x85, 0xb7, 0xa6, 0xd2, 0xc3,
267 0xf1, 0xe0, 0x18, 0x09, 0x3b, 0x2a, 0x5e, 0x4f, 0x7d, 0x6c, 0xa5, 0xb4, 0x86, 0x97, 0xe3,
268 0xf2, 0xc0, 0xd1, 0x29, 0x38, 0x0a, 0x1b, 0x6f, 0x7e, 0x4c, 0x5d, 0xb5, 0xa4, 0x96, 0x87,
269 0xf3, 0xe2, 0xd0, 0xc1, 0x39, 0x28, 0x1a, 0x0b, 0x7f, 0x6e, 0x5c, 0x4d, 0xc6, 0xd7, 0xe5,
270 0xf4, 0x80, 0x91, 0xa3, 0xb2, 0x4a, 0x5b, 0x69, 0x78, 0x0c, 0x1d, 0x2f, 0x3e, 0xd6, 0xc7,
271 0xf5, 0xe4, 0x90, 0x81, 0xb3, 0xa2, 0x5a, 0x4b, 0x79, 0x68, 0x1c, 0x0d, 0x3f, 0x2e, 0xe7,
272 0xf6, 0xc4, 0xd5, 0xa1, 0xb0, 0x82, 0x93, 0x6b, 0x7a, 0x48, 0x59, 0x2d, 0x3c, 0x0e, 0x1f,
273 0xf7, 0xe6, 0xd4, 0xc5, 0xb1, 0xa0, 0x92, 0x83, 0x7b, 0x6a, 0x58, 0x49, 0x3d, 0x2c, 0x1e,
274 0x0f};
275
276 /*************************************************************************
277 * FPGA functions
278 ************************************************************************/
279
280 static void delay(int ms)
281 {
282 unsigned long timeout = jiffies + ((ms * HZ) / 1000);
283 while (time_before(jiffies, timeout))
284 cpu_relax();
285 }
286
287 /*
288 * reset FPGA
289 */
290
291 static void fpga_reset(int iobase)
292 {
293 outb(0, IER(iobase));
294 outb(LCR_DLAB | LCR_BIT5, LCR(iobase));
295 outb(1, DLL(iobase));
296 outb(0, DLM(iobase));
297
298 outb(LCR_BIT5, LCR(iobase));
299 inb(LSR(iobase));
300 inb(MSR(iobase));
301 /* turn off FPGA supply voltage */
302 outb(MCR_OUT1 | MCR_OUT2, MCR(iobase));
303 delay(100);
304 /* turn on FPGA supply voltage again */
305 outb(MCR_DTR | MCR_RTS | MCR_OUT1 | MCR_OUT2, MCR(iobase));
306 delay(100);
307 }
308
309 /*
310 * send one byte to FPGA
311 */
312
313 static int fpga_write(int iobase, unsigned char wrd)
314 {
315 unsigned char bit;
316 int k;
317 unsigned long timeout = jiffies + HZ / 10;
318
319 for (k = 0; k < 8; k++) {
320 bit = (wrd & 0x80) ? (MCR_RTS | MCR_DTR) : MCR_DTR;
321 outb(bit | MCR_OUT1 | MCR_OUT2, MCR(iobase));
322 wrd <<= 1;
323 outb(0xfc, THR(iobase));
324 while ((inb(LSR(iobase)) & LSR_TSRE) == 0)
325 if (time_after(jiffies, timeout))
326 return -1;
327 }
328
329 return 0;
330 }
331
332 /*
333 * predef should be 0 for loading user defined mcs
334 * predef should be YAM_1200 for loading predef 1200 mcs
335 * predef should be YAM_9600 for loading predef 9600 mcs
336 */
337 static unsigned char *add_mcs(unsigned char *bits, int bitrate,
338 unsigned int predef)
339 {
340 const char *fw_name[2] = {FIRMWARE_9600, FIRMWARE_1200};
341 const struct firmware *fw;
342 struct platform_device *pdev;
343 struct yam_mcs *p;
344 int err;
345
346 switch (predef) {
347 case 0:
348 fw = NULL;
349 break;
350 case YAM_1200:
351 case YAM_9600:
352 predef--;
353 pdev = platform_device_register_simple("yam", 0, NULL, 0);
354 if (IS_ERR(pdev)) {
355 printk(KERN_ERR "yam: Failed to register firmware\n");
356 return NULL;
357 }
358 err = request_firmware(&fw, fw_name[predef], &pdev->dev);
359 platform_device_unregister(pdev);
360 if (err) {
361 printk(KERN_ERR "Failed to load firmware \"%s\"\n",
362 fw_name[predef]);
363 return NULL;
364 }
365 if (fw->size != YAM_FPGA_SIZE) {
366 printk(KERN_ERR "Bogus length %zu in firmware \"%s\"\n",
367 fw->size, fw_name[predef]);
368 release_firmware(fw);
369 return NULL;
370 }
371 bits = (unsigned char *)fw->data;
372 break;
373 default:
374 printk(KERN_ERR "yam: Invalid predef number %u\n", predef);
375 return NULL;
376 }
377
378 /* If it already exists, replace the bit data */
379 p = yam_data;
380 while (p) {
381 if (p->bitrate == bitrate) {
382 memcpy(p->bits, bits, YAM_FPGA_SIZE);
383 goto out;
384 }
385 p = p->next;
386 }
387
388 /* Allocate a new mcs */
389 if ((p = kmalloc(sizeof(struct yam_mcs), GFP_KERNEL)) == NULL) {
390 release_firmware(fw);
391 return NULL;
392 }
393 memcpy(p->bits, bits, YAM_FPGA_SIZE);
394 p->bitrate = bitrate;
395 p->next = yam_data;
396 yam_data = p;
397 out:
398 release_firmware(fw);
399 return p->bits;
400 }
401
402 static unsigned char *get_mcs(int bitrate)
403 {
404 struct yam_mcs *p;
405
406 p = yam_data;
407 while (p) {
408 if (p->bitrate == bitrate)
409 return p->bits;
410 p = p->next;
411 }
412
413 /* Load predefined mcs data */
414 switch (bitrate) {
415 case 1200:
416 /* setting predef as YAM_1200 for loading predef 1200 mcs */
417 return add_mcs(NULL, bitrate, YAM_1200);
418 default:
419 /* setting predef as YAM_9600 for loading predef 9600 mcs */
420 return add_mcs(NULL, bitrate, YAM_9600);
421 }
422 }
423
424 /*
425 * download bitstream to FPGA
426 * data is contained in bits[] array in yam1200.h resp. yam9600.h
427 */
428
429 static int fpga_download(int iobase, int bitrate)
430 {
431 int i, rc;
432 unsigned char *pbits;
433
434 pbits = get_mcs(bitrate);
435 if (pbits == NULL)
436 return -1;
437
438 fpga_reset(iobase);
439 for (i = 0; i < YAM_FPGA_SIZE; i++) {
440 if (fpga_write(iobase, pbits[i])) {
441 printk(KERN_ERR "yam: error in write cycle\n");
442 return -1; /* write... */
443 }
444 }
445
446 fpga_write(iobase, 0xFF);
447 rc = inb(MSR(iobase)); /* check DONE signal */
448
449 /* Needed for some hardwares */
450 delay(50);
451
452 return (rc & MSR_DSR) ? 0 : -1;
453 }
454
455
456 /************************************************************************
457 * Serial port init
458 ************************************************************************/
459
460 static void yam_set_uart(struct net_device *dev)
461 {
462 struct yam_port *yp = netdev_priv(dev);
463 int divisor = 115200 / yp->baudrate;
464
465 outb(0, IER(dev->base_addr));
466 outb(LCR_DLAB | LCR_BIT8, LCR(dev->base_addr));
467 outb(divisor, DLL(dev->base_addr));
468 outb(0, DLM(dev->base_addr));
469 outb(LCR_BIT8, LCR(dev->base_addr));
470 outb(PTT_OFF, MCR(dev->base_addr));
471 outb(0x00, FCR(dev->base_addr));
472
473 /* Flush pending irq */
474
475 inb(RBR(dev->base_addr));
476 inb(MSR(dev->base_addr));
477
478 /* Enable rx irq */
479
480 outb(ENABLE_RTXINT, IER(dev->base_addr));
481 }
482
483
484 /* --------------------------------------------------------------------- */
485
486 enum uart {
487 c_uart_unknown, c_uart_8250,
488 c_uart_16450, c_uart_16550, c_uart_16550A
489 };
490
491 static const char *uart_str[] =
492 {"unknown", "8250", "16450", "16550", "16550A"};
493
494 static enum uart yam_check_uart(unsigned int iobase)
495 {
496 unsigned char b1, b2, b3;
497 enum uart u;
498 enum uart uart_tab[] =
499 {c_uart_16450, c_uart_unknown, c_uart_16550, c_uart_16550A};
500
501 b1 = inb(MCR(iobase));
502 outb(b1 | 0x10, MCR(iobase)); /* loopback mode */
503 b2 = inb(MSR(iobase));
504 outb(0x1a, MCR(iobase));
505 b3 = inb(MSR(iobase)) & 0xf0;
506 outb(b1, MCR(iobase)); /* restore old values */
507 outb(b2, MSR(iobase));
508 if (b3 != 0x90)
509 return c_uart_unknown;
510 inb(RBR(iobase));
511 inb(RBR(iobase));
512 outb(0x01, FCR(iobase)); /* enable FIFOs */
513 u = uart_tab[(inb(IIR(iobase)) >> 6) & 3];
514 if (u == c_uart_16450) {
515 outb(0x5a, SCR(iobase));
516 b1 = inb(SCR(iobase));
517 outb(0xa5, SCR(iobase));
518 b2 = inb(SCR(iobase));
519 if ((b1 != 0x5a) || (b2 != 0xa5))
520 u = c_uart_8250;
521 }
522 return u;
523 }
524
525 /******************************************************************************
526 * Rx Section
527 ******************************************************************************/
528 static inline void yam_rx_flag(struct net_device *dev, struct yam_port *yp)
529 {
530 if (yp->dcd && yp->rx_len >= 3 && yp->rx_len < YAM_MAX_FRAME) {
531 int pkt_len = yp->rx_len - 2 + 1; /* -CRC + kiss */
532 struct sk_buff *skb;
533
534 if ((yp->rx_crch & yp->rx_crcl) != 0xFF) {
535 /* Bad crc */
536 } else {
537 if (!(skb = dev_alloc_skb(pkt_len))) {
538 printk(KERN_WARNING "%s: memory squeeze, dropping packet\n", dev->name);
539 ++dev->stats.rx_dropped;
540 } else {
541 unsigned char *cp;
542 cp = skb_put(skb, pkt_len);
543 *cp++ = 0; /* KISS kludge */
544 memcpy(cp, yp->rx_buf, pkt_len - 1);
545 skb->protocol = ax25_type_trans(skb, dev);
546 netif_rx(skb);
547 ++dev->stats.rx_packets;
548 }
549 }
550 }
551 yp->rx_len = 0;
552 yp->rx_crcl = 0x21;
553 yp->rx_crch = 0xf3;
554 }
555
556 static inline void yam_rx_byte(struct net_device *dev, struct yam_port *yp, unsigned char rxb)
557 {
558 if (yp->rx_len < YAM_MAX_FRAME) {
559 unsigned char c = yp->rx_crcl;
560 yp->rx_crcl = (chktabl[c] ^ yp->rx_crch);
561 yp->rx_crch = (chktabh[c] ^ rxb);
562 yp->rx_buf[yp->rx_len++] = rxb;
563 }
564 }
565
566 /********************************************************************************
567 * TX Section
568 ********************************************************************************/
569
570 static void ptt_on(struct net_device *dev)
571 {
572 outb(PTT_ON, MCR(dev->base_addr));
573 }
574
575 static void ptt_off(struct net_device *dev)
576 {
577 outb(PTT_OFF, MCR(dev->base_addr));
578 }
579
580 static netdev_tx_t yam_send_packet(struct sk_buff *skb,
581 struct net_device *dev)
582 {
583 struct yam_port *yp = netdev_priv(dev);
584
585 if (skb->protocol == htons(ETH_P_IP))
586 return ax25_ip_xmit(skb);
587
588 skb_queue_tail(&yp->send_queue, skb);
589 netif_trans_update(dev);
590 return NETDEV_TX_OK;
591 }
592
593 static void yam_start_tx(struct net_device *dev, struct yam_port *yp)
594 {
595 if ((yp->tx_state == TX_TAIL) || (yp->txd == 0))
596 yp->tx_count = 1;
597 else
598 yp->tx_count = (yp->bitrate * yp->txd) / 8000;
599 yp->tx_state = TX_HEAD;
600 ptt_on(dev);
601 }
602
603 static void yam_arbitrate(struct net_device *dev)
604 {
605 struct yam_port *yp = netdev_priv(dev);
606
607 if (yp->magic != YAM_MAGIC || yp->tx_state != TX_OFF ||
608 skb_queue_empty(&yp->send_queue))
609 return;
610 /* tx_state is TX_OFF and there is data to send */
611
612 if (yp->dupmode) {
613 /* Full duplex mode, don't wait */
614 yam_start_tx(dev, yp);
615 return;
616 }
617 if (yp->dcd) {
618 /* DCD on, wait slotime ... */
619 yp->slotcnt = yp->slot / 10;
620 return;
621 }
622 /* Is slottime passed ? */
623 if ((--yp->slotcnt) > 0)
624 return;
625
626 yp->slotcnt = yp->slot / 10;
627
628 /* is random > persist ? */
629 if ((prandom_u32() % 256) > yp->pers)
630 return;
631
632 yam_start_tx(dev, yp);
633 }
634
635 static void yam_dotimer(struct timer_list *unused)
636 {
637 int i;
638
639 for (i = 0; i < NR_PORTS; i++) {
640 struct net_device *dev = yam_devs[i];
641 if (dev && netif_running(dev))
642 yam_arbitrate(dev);
643 }
644 yam_timer.expires = jiffies + HZ / 100;
645 add_timer(&yam_timer);
646 }
647
648 static void yam_tx_byte(struct net_device *dev, struct yam_port *yp)
649 {
650 struct sk_buff *skb;
651 unsigned char b, temp;
652
653 switch (yp->tx_state) {
654 case TX_OFF:
655 break;
656 case TX_HEAD:
657 if (--yp->tx_count <= 0) {
658 if (!(skb = skb_dequeue(&yp->send_queue))) {
659 ptt_off(dev);
660 yp->tx_state = TX_OFF;
661 break;
662 }
663 yp->tx_state = TX_DATA;
664 if (skb->data[0] != 0) {
665 /* do_kiss_params(s, skb->data, skb->len); */
666 dev_kfree_skb_any(skb);
667 break;
668 }
669 yp->tx_len = skb->len - 1; /* strip KISS byte */
670 if (yp->tx_len >= YAM_MAX_FRAME || yp->tx_len < 2) {
671 dev_kfree_skb_any(skb);
672 break;
673 }
674 skb_copy_from_linear_data_offset(skb, 1,
675 yp->tx_buf,
676 yp->tx_len);
677 dev_kfree_skb_any(skb);
678 yp->tx_count = 0;
679 yp->tx_crcl = 0x21;
680 yp->tx_crch = 0xf3;
681 yp->tx_state = TX_DATA;
682 }
683 break;
684 case TX_DATA:
685 b = yp->tx_buf[yp->tx_count++];
686 outb(b, THR(dev->base_addr));
687 temp = yp->tx_crcl;
688 yp->tx_crcl = chktabl[temp] ^ yp->tx_crch;
689 yp->tx_crch = chktabh[temp] ^ b;
690 if (yp->tx_count >= yp->tx_len) {
691 yp->tx_state = TX_CRC1;
692 }
693 break;
694 case TX_CRC1:
695 yp->tx_crch = chktabl[yp->tx_crcl] ^ yp->tx_crch;
696 yp->tx_crcl = chktabh[yp->tx_crcl] ^ chktabl[yp->tx_crch] ^ 0xff;
697 outb(yp->tx_crcl, THR(dev->base_addr));
698 yp->tx_state = TX_CRC2;
699 break;
700 case TX_CRC2:
701 outb(chktabh[yp->tx_crch] ^ 0xFF, THR(dev->base_addr));
702 if (skb_queue_empty(&yp->send_queue)) {
703 yp->tx_count = (yp->bitrate * yp->txtail) / 8000;
704 if (yp->dupmode == 2)
705 yp->tx_count += (yp->bitrate * yp->holdd) / 8;
706 if (yp->tx_count == 0)
707 yp->tx_count = 1;
708 yp->tx_state = TX_TAIL;
709 } else {
710 yp->tx_count = 1;
711 yp->tx_state = TX_HEAD;
712 }
713 ++dev->stats.tx_packets;
714 break;
715 case TX_TAIL:
716 if (--yp->tx_count <= 0) {
717 yp->tx_state = TX_OFF;
718 ptt_off(dev);
719 }
720 break;
721 }
722 }
723
724 /***********************************************************************************
725 * ISR routine
726 ************************************************************************************/
727
728 static irqreturn_t yam_interrupt(int irq, void *dev_id)
729 {
730 struct net_device *dev;
731 struct yam_port *yp;
732 unsigned char iir;
733 int counter = 100;
734 int i;
735 int handled = 0;
736
737 for (i = 0; i < NR_PORTS; i++) {
738 dev = yam_devs[i];
739 yp = netdev_priv(dev);
740
741 if (!netif_running(dev))
742 continue;
743
744 while ((iir = IIR_MASK & inb(IIR(dev->base_addr))) != IIR_NOPEND) {
745 unsigned char msr = inb(MSR(dev->base_addr));
746 unsigned char lsr = inb(LSR(dev->base_addr));
747 unsigned char rxb;
748
749 handled = 1;
750
751 if (lsr & LSR_OE)
752 ++dev->stats.rx_fifo_errors;
753
754 yp->dcd = (msr & RX_DCD) ? 1 : 0;
755
756 if (--counter <= 0) {
757 printk(KERN_ERR "%s: too many irq iir=%d\n",
758 dev->name, iir);
759 goto out;
760 }
761 if (msr & TX_RDY) {
762 ++yp->nb_mdint;
763 yam_tx_byte(dev, yp);
764 }
765 if (lsr & LSR_RXC) {
766 ++yp->nb_rxint;
767 rxb = inb(RBR(dev->base_addr));
768 if (msr & RX_FLAG)
769 yam_rx_flag(dev, yp);
770 else
771 yam_rx_byte(dev, yp, rxb);
772 }
773 }
774 }
775 out:
776 return IRQ_RETVAL(handled);
777 }
778
779 #ifdef CONFIG_PROC_FS
780
781 static void *yam_seq_start(struct seq_file *seq, loff_t *pos)
782 {
783 return (*pos < NR_PORTS) ? yam_devs[*pos] : NULL;
784 }
785
786 static void *yam_seq_next(struct seq_file *seq, void *v, loff_t *pos)
787 {
788 ++*pos;
789 return (*pos < NR_PORTS) ? yam_devs[*pos] : NULL;
790 }
791
792 static void yam_seq_stop(struct seq_file *seq, void *v)
793 {
794 }
795
796 static int yam_seq_show(struct seq_file *seq, void *v)
797 {
798 struct net_device *dev = v;
799 const struct yam_port *yp = netdev_priv(dev);
800
801 seq_printf(seq, "Device %s\n", dev->name);
802 seq_printf(seq, " Up %d\n", netif_running(dev));
803 seq_printf(seq, " Speed %u\n", yp->bitrate);
804 seq_printf(seq, " IoBase 0x%x\n", yp->iobase);
805 seq_printf(seq, " BaudRate %u\n", yp->baudrate);
806 seq_printf(seq, " IRQ %u\n", yp->irq);
807 seq_printf(seq, " TxState %u\n", yp->tx_state);
808 seq_printf(seq, " Duplex %u\n", yp->dupmode);
809 seq_printf(seq, " HoldDly %u\n", yp->holdd);
810 seq_printf(seq, " TxDelay %u\n", yp->txd);
811 seq_printf(seq, " TxTail %u\n", yp->txtail);
812 seq_printf(seq, " SlotTime %u\n", yp->slot);
813 seq_printf(seq, " Persist %u\n", yp->pers);
814 seq_printf(seq, " TxFrames %lu\n", dev->stats.tx_packets);
815 seq_printf(seq, " RxFrames %lu\n", dev->stats.rx_packets);
816 seq_printf(seq, " TxInt %u\n", yp->nb_mdint);
817 seq_printf(seq, " RxInt %u\n", yp->nb_rxint);
818 seq_printf(seq, " RxOver %lu\n", dev->stats.rx_fifo_errors);
819 seq_printf(seq, "\n");
820 return 0;
821 }
822
823 static const struct seq_operations yam_seqops = {
824 .start = yam_seq_start,
825 .next = yam_seq_next,
826 .stop = yam_seq_stop,
827 .show = yam_seq_show,
828 };
829 #endif
830
831
832 /* --------------------------------------------------------------------- */
833
834 static int yam_open(struct net_device *dev)
835 {
836 struct yam_port *yp = netdev_priv(dev);
837 enum uart u;
838 int i;
839 int ret=0;
840
841 printk(KERN_INFO "Trying %s at iobase 0x%lx irq %u\n", dev->name, dev->base_addr, dev->irq);
842
843 if (!yp->bitrate)
844 return -ENXIO;
845 if (!dev->base_addr || dev->base_addr > 0x1000 - YAM_EXTENT ||
846 dev->irq < 2 || dev->irq > 15) {
847 return -ENXIO;
848 }
849 if (!request_region(dev->base_addr, YAM_EXTENT, dev->name))
850 {
851 printk(KERN_ERR "%s: cannot 0x%lx busy\n", dev->name, dev->base_addr);
852 return -EACCES;
853 }
854 if ((u = yam_check_uart(dev->base_addr)) == c_uart_unknown) {
855 printk(KERN_ERR "%s: cannot find uart type\n", dev->name);
856 ret = -EIO;
857 goto out_release_base;
858 }
859 if (fpga_download(dev->base_addr, yp->bitrate)) {
860 printk(KERN_ERR "%s: cannot init FPGA\n", dev->name);
861 ret = -EIO;
862 goto out_release_base;
863 }
864 outb(0, IER(dev->base_addr));
865 if (request_irq(dev->irq, yam_interrupt, IRQF_SHARED, dev->name, dev)) {
866 printk(KERN_ERR "%s: irq %d busy\n", dev->name, dev->irq);
867 ret = -EBUSY;
868 goto out_release_base;
869 }
870
871 yam_set_uart(dev);
872
873 netif_start_queue(dev);
874
875 yp->slotcnt = yp->slot / 10;
876
877 /* Reset overruns for all ports - FPGA programming makes overruns */
878 for (i = 0; i < NR_PORTS; i++) {
879 struct net_device *yam_dev = yam_devs[i];
880
881 inb(LSR(yam_dev->base_addr));
882 yam_dev->stats.rx_fifo_errors = 0;
883 }
884
885 printk(KERN_INFO "%s at iobase 0x%lx irq %u uart %s\n", dev->name, dev->base_addr, dev->irq,
886 uart_str[u]);
887 return 0;
888
889 out_release_base:
890 release_region(dev->base_addr, YAM_EXTENT);
891 return ret;
892 }
893
894 /* --------------------------------------------------------------------- */
895
896 static int yam_close(struct net_device *dev)
897 {
898 struct sk_buff *skb;
899 struct yam_port *yp = netdev_priv(dev);
900
901 if (!dev)
902 return -EINVAL;
903
904 /*
905 * disable interrupts
906 */
907 outb(0, IER(dev->base_addr));
908 outb(1, MCR(dev->base_addr));
909 /* Remove IRQ handler if last */
910 free_irq(dev->irq,dev);
911 release_region(dev->base_addr, YAM_EXTENT);
912 netif_stop_queue(dev);
913 while ((skb = skb_dequeue(&yp->send_queue)))
914 dev_kfree_skb(skb);
915
916 printk(KERN_INFO "%s: close yam at iobase 0x%lx irq %u\n",
917 yam_drvname, dev->base_addr, dev->irq);
918 return 0;
919 }
920
921 /* --------------------------------------------------------------------- */
922
923 static int yam_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
924 {
925 struct yam_port *yp = netdev_priv(dev);
926 struct yamdrv_ioctl_cfg yi;
927 struct yamdrv_ioctl_mcs *ym;
928 int ioctl_cmd;
929
930 if (copy_from_user(&ioctl_cmd, ifr->ifr_data, sizeof(int)))
931 return -EFAULT;
932
933 if (yp->magic != YAM_MAGIC)
934 return -EINVAL;
935
936 if (!capable(CAP_NET_ADMIN))
937 return -EPERM;
938
939 if (cmd != SIOCDEVPRIVATE)
940 return -EINVAL;
941
942 switch (ioctl_cmd) {
943
944 case SIOCYAMRESERVED:
945 return -EINVAL; /* unused */
946
947 case SIOCYAMSMCS:
948 if (netif_running(dev))
949 return -EINVAL; /* Cannot change this parameter when up */
950 ym = memdup_user(ifr->ifr_data,
951 sizeof(struct yamdrv_ioctl_mcs));
952 if (IS_ERR(ym))
953 return PTR_ERR(ym);
954 if (ym->cmd != SIOCYAMSMCS)
955 return -EINVAL;
956 if (ym->bitrate > YAM_MAXBITRATE) {
957 kfree(ym);
958 return -EINVAL;
959 }
960 /* setting predef as 0 for loading userdefined mcs data */
961 add_mcs(ym->bits, ym->bitrate, 0);
962 kfree(ym);
963 break;
964
965 case SIOCYAMSCFG:
966 if (!capable(CAP_SYS_RAWIO))
967 return -EPERM;
968 if (copy_from_user(&yi, ifr->ifr_data, sizeof(struct yamdrv_ioctl_cfg)))
969 return -EFAULT;
970
971 if (yi.cmd != SIOCYAMSCFG)
972 return -EINVAL;
973 if ((yi.cfg.mask & YAM_IOBASE) && netif_running(dev))
974 return -EINVAL; /* Cannot change this parameter when up */
975 if ((yi.cfg.mask & YAM_IRQ) && netif_running(dev))
976 return -EINVAL; /* Cannot change this parameter when up */
977 if ((yi.cfg.mask & YAM_BITRATE) && netif_running(dev))
978 return -EINVAL; /* Cannot change this parameter when up */
979 if ((yi.cfg.mask & YAM_BAUDRATE) && netif_running(dev))
980 return -EINVAL; /* Cannot change this parameter when up */
981
982 if (yi.cfg.mask & YAM_IOBASE) {
983 yp->iobase = yi.cfg.iobase;
984 dev->base_addr = yi.cfg.iobase;
985 }
986 if (yi.cfg.mask & YAM_IRQ) {
987 if (yi.cfg.irq > 15)
988 return -EINVAL;
989 yp->irq = yi.cfg.irq;
990 dev->irq = yi.cfg.irq;
991 }
992 if (yi.cfg.mask & YAM_BITRATE) {
993 if (yi.cfg.bitrate > YAM_MAXBITRATE)
994 return -EINVAL;
995 yp->bitrate = yi.cfg.bitrate;
996 }
997 if (yi.cfg.mask & YAM_BAUDRATE) {
998 if (yi.cfg.baudrate > YAM_MAXBAUDRATE)
999 return -EINVAL;
1000 yp->baudrate = yi.cfg.baudrate;
1001 }
1002 if (yi.cfg.mask & YAM_MODE) {
1003 if (yi.cfg.mode > YAM_MAXMODE)
1004 return -EINVAL;
1005 yp->dupmode = yi.cfg.mode;
1006 }
1007 if (yi.cfg.mask & YAM_HOLDDLY) {
1008 if (yi.cfg.holddly > YAM_MAXHOLDDLY)
1009 return -EINVAL;
1010 yp->holdd = yi.cfg.holddly;
1011 }
1012 if (yi.cfg.mask & YAM_TXDELAY) {
1013 if (yi.cfg.txdelay > YAM_MAXTXDELAY)
1014 return -EINVAL;
1015 yp->txd = yi.cfg.txdelay;
1016 }
1017 if (yi.cfg.mask & YAM_TXTAIL) {
1018 if (yi.cfg.txtail > YAM_MAXTXTAIL)
1019 return -EINVAL;
1020 yp->txtail = yi.cfg.txtail;
1021 }
1022 if (yi.cfg.mask & YAM_PERSIST) {
1023 if (yi.cfg.persist > YAM_MAXPERSIST)
1024 return -EINVAL;
1025 yp->pers = yi.cfg.persist;
1026 }
1027 if (yi.cfg.mask & YAM_SLOTTIME) {
1028 if (yi.cfg.slottime > YAM_MAXSLOTTIME)
1029 return -EINVAL;
1030 yp->slot = yi.cfg.slottime;
1031 yp->slotcnt = yp->slot / 10;
1032 }
1033 break;
1034
1035 case SIOCYAMGCFG:
1036 memset(&yi, 0, sizeof(yi));
1037 yi.cfg.mask = 0xffffffff;
1038 yi.cfg.iobase = yp->iobase;
1039 yi.cfg.irq = yp->irq;
1040 yi.cfg.bitrate = yp->bitrate;
1041 yi.cfg.baudrate = yp->baudrate;
1042 yi.cfg.mode = yp->dupmode;
1043 yi.cfg.txdelay = yp->txd;
1044 yi.cfg.holddly = yp->holdd;
1045 yi.cfg.txtail = yp->txtail;
1046 yi.cfg.persist = yp->pers;
1047 yi.cfg.slottime = yp->slot;
1048 if (copy_to_user(ifr->ifr_data, &yi, sizeof(struct yamdrv_ioctl_cfg)))
1049 return -EFAULT;
1050 break;
1051
1052 default:
1053 return -EINVAL;
1054
1055 }
1056
1057 return 0;
1058 }
1059
1060 /* --------------------------------------------------------------------- */
1061
1062 static int yam_set_mac_address(struct net_device *dev, void *addr)
1063 {
1064 struct sockaddr *sa = (struct sockaddr *) addr;
1065
1066 /* addr is an AX.25 shifted ASCII mac address */
1067 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
1068 return 0;
1069 }
1070
1071 /* --------------------------------------------------------------------- */
1072
1073 static const struct net_device_ops yam_netdev_ops = {
1074 .ndo_open = yam_open,
1075 .ndo_stop = yam_close,
1076 .ndo_start_xmit = yam_send_packet,
1077 .ndo_do_ioctl = yam_ioctl,
1078 .ndo_set_mac_address = yam_set_mac_address,
1079 };
1080
1081 static void yam_setup(struct net_device *dev)
1082 {
1083 struct yam_port *yp = netdev_priv(dev);
1084
1085 yp->magic = YAM_MAGIC;
1086 yp->bitrate = DEFAULT_BITRATE;
1087 yp->baudrate = DEFAULT_BITRATE * 2;
1088 yp->iobase = 0;
1089 yp->irq = 0;
1090 yp->dupmode = 0;
1091 yp->holdd = DEFAULT_HOLDD;
1092 yp->txd = DEFAULT_TXD;
1093 yp->txtail = DEFAULT_TXTAIL;
1094 yp->slot = DEFAULT_SLOT;
1095 yp->pers = DEFAULT_PERS;
1096 yp->dev = dev;
1097
1098 dev->base_addr = yp->iobase;
1099 dev->irq = yp->irq;
1100
1101 skb_queue_head_init(&yp->send_queue);
1102
1103 dev->netdev_ops = &yam_netdev_ops;
1104 dev->header_ops = &ax25_header_ops;
1105
1106 dev->type = ARPHRD_AX25;
1107 dev->hard_header_len = AX25_MAX_HEADER_LEN;
1108 dev->mtu = AX25_MTU;
1109 dev->addr_len = AX25_ADDR_LEN;
1110 memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN);
1111 memcpy(dev->dev_addr, &ax25_defaddr, AX25_ADDR_LEN);
1112 }
1113
1114 static int __init yam_init_driver(void)
1115 {
1116 struct net_device *dev;
1117 int i, err;
1118 char name[IFNAMSIZ];
1119
1120 printk(yam_drvinfo);
1121
1122 for (i = 0; i < NR_PORTS; i++) {
1123 sprintf(name, "yam%d", i);
1124
1125 dev = alloc_netdev(sizeof(struct yam_port), name,
1126 NET_NAME_UNKNOWN, yam_setup);
1127 if (!dev) {
1128 pr_err("yam: cannot allocate net device\n");
1129 err = -ENOMEM;
1130 goto error;
1131 }
1132
1133 err = register_netdev(dev);
1134 if (err) {
1135 printk(KERN_WARNING "yam: cannot register net device %s\n", dev->name);
1136 goto error;
1137 }
1138 yam_devs[i] = dev;
1139
1140 }
1141
1142 timer_setup(&yam_timer, yam_dotimer, 0);
1143 yam_timer.expires = jiffies + HZ / 100;
1144 add_timer(&yam_timer);
1145
1146 proc_create_seq("yam", 0444, init_net.proc_net, &yam_seqops);
1147 return 0;
1148 error:
1149 while (--i >= 0) {
1150 unregister_netdev(yam_devs[i]);
1151 free_netdev(yam_devs[i]);
1152 }
1153 return err;
1154 }
1155
1156 /* --------------------------------------------------------------------- */
1157
1158 static void __exit yam_cleanup_driver(void)
1159 {
1160 struct yam_mcs *p;
1161 int i;
1162
1163 del_timer_sync(&yam_timer);
1164 for (i = 0; i < NR_PORTS; i++) {
1165 struct net_device *dev = yam_devs[i];
1166 if (dev) {
1167 unregister_netdev(dev);
1168 free_netdev(dev);
1169 }
1170 }
1171
1172 while (yam_data) {
1173 p = yam_data;
1174 yam_data = yam_data->next;
1175 kfree(p);
1176 }
1177
1178 remove_proc_entry("yam", init_net.proc_net);
1179 }
1180
1181 /* --------------------------------------------------------------------- */
1182
1183 MODULE_AUTHOR("Frederic Rible F1OAT frible@teaser.fr");
1184 MODULE_DESCRIPTION("Yam amateur radio modem driver");
1185 MODULE_LICENSE("GPL");
1186 MODULE_FIRMWARE(FIRMWARE_1200);
1187 MODULE_FIRMWARE(FIRMWARE_9600);
1188
1189 module_init(yam_init_driver);
1190 module_exit(yam_cleanup_driver);
1191
1192 /* --------------------------------------------------------------------- */
1193
Linux with added FPC-III support