1 /*****************************************************************************/
4 * yam.c -- YAM radio modem driver.
6 * Copyright (C) 1998 Frederic Rible F1OAT (frible@teaser.fr)
7 * Adapted from baycom.c driver written by Thomas Sailer (sailer@ife.ee.ethz.ch)
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 * Please note that the GPL allows you to use the driver, NOT the radio.
24 * In order to use the radio, you need a license from the communications
25 * authority of your country.
29 * 0.0 F1OAT 06.06.98 Begin of work with baycom.c source code V 0.3
30 * 0.1 F1OAT 07.06.98 Add timer polling routine for channel arbitration
31 * 0.2 F6FBB 08.06.98 Added delay after FPGA programming
32 * 0.3 F6FBB 29.07.98 Delayed PTT implementation for dupmode=2
33 * 0.4 F6FBB 30.07.98 Added TxTail, Slottime and Persistance
34 * 0.5 F6FBB 01.08.98 Shared IRQs, /proc/net and network statistics
35 * 0.6 F6FBB 25.08.98 Added 1200Bds format
36 * 0.7 F6FBB 12.09.98 Added to the kernel configuration
37 * 0.8 F6FBB 14.10.98 Fixed slottime/persistence timing bug
38 * OK1ZIA 2.09.01 Fixed "kfree_skb on hard IRQ"
39 * using dev_kfree_skb_any(). (important in 2.4 kernel)
43 /*****************************************************************************/
45 #include <linux/module.h>
46 #include <linux/types.h>
47 #include <linux/net.h>
50 #include <linux/slab.h>
51 #include <linux/errno.h>
52 #include <linux/bitops.h>
53 #include <linux/random.h>
55 #include <asm/system.h>
56 #include <linux/interrupt.h>
57 #include <linux/ioport.h>
59 #include <linux/netdevice.h>
60 #include <linux/if_arp.h>
61 #include <linux/etherdevice.h>
62 #include <linux/skbuff.h>
65 #include <linux/kernel.h>
66 #include <linux/proc_fs.h>
67 #include <linux/seq_file.h>
69 #include <asm/uaccess.h>
70 #include <linux/init.h>
72 #include <linux/yam.h>
76 /* --------------------------------------------------------------------- */
78 static const char yam_drvname[] = "yam";
79 static char yam_drvinfo[] __initdata = KERN_INFO "YAM driver version 0.8 by F1OAT/F6FBB\n";
81 /* --------------------------------------------------------------------- */
87 #define YAM_MAGIC 0xF10A7654
89 /* Transmitter states */
98 #define YAM_MAX_FRAME 1024
100 #define DEFAULT_BITRATE 9600 /* bps */
101 #define DEFAULT_HOLDD 10 /* sec */
102 #define DEFAULT_TXD 300 /* ms */
103 #define DEFAULT_TXTAIL 10 /* ms */
104 #define DEFAULT_SLOT 100 /* ms */
105 #define DEFAULT_PERS 64 /* 0->255 */
115 struct net_device *dev;
119 struct net_device_stats stats;
124 /* Parameters section */
126 int txd; /* tx delay */
127 int holdd; /* duplex ptt delay */
128 int txtail; /* txtail delay */
129 int slot; /* slottime */
130 int pers; /* persistence */
137 unsigned char tx_buf[YAM_MAX_FRAME];
139 int tx_crcl, tx_crch;
140 struct sk_buff_head send_queue; /* Packets awaiting transmission */
145 unsigned char rx_buf[YAM_MAX_FRAME];
147 int rx_crcl, rx_crch;
151 unsigned char bits[YAM_FPGA_SIZE];
153 struct yam_mcs *next;
156 static struct net_device *yam_devs[NR_PORTS];
158 static struct yam_mcs *yam_data;
160 static DEFINE_TIMER(yam_timer, NULL, 0, 0);
162 /* --------------------------------------------------------------------- */
164 #define RBR(iobase) (iobase+0)
165 #define THR(iobase) (iobase+0)
166 #define IER(iobase) (iobase+1)
167 #define IIR(iobase) (iobase+2)
168 #define FCR(iobase) (iobase+2)
169 #define LCR(iobase) (iobase+3)
170 #define MCR(iobase) (iobase+4)
171 #define LSR(iobase) (iobase+5)
172 #define MSR(iobase) (iobase+6)
173 #define SCR(iobase) (iobase+7)
174 #define DLL(iobase) (iobase+0)
175 #define DLM(iobase) (iobase+1)
179 /* Interrupt Identification Register Bit Masks */
185 #define IIR_TIMEOUT 12 /* Fifo mode only */
187 #define IIR_MASK 0x0F
189 /* Interrupt Enable Register Bit Masks */
190 #define IER_RX 1 /* enable rx interrupt */
191 #define IER_TX 2 /* enable tx interrupt */
192 #define IER_LSR 4 /* enable line status interrupts */
193 #define IER_MSR 8 /* enable modem status interrupts */
195 /* Modem Control Register Bit Masks */
196 #define MCR_DTR 0x01 /* DTR output */
197 #define MCR_RTS 0x02 /* RTS output */
198 #define MCR_OUT1 0x04 /* OUT1 output (not accessible in RS232) */
199 #define MCR_OUT2 0x08 /* Master Interrupt enable (must be set on PCs) */
200 #define MCR_LOOP 0x10 /* Loopback enable */
202 /* Modem Status Register Bit Masks */
203 #define MSR_DCTS 0x01 /* Delta CTS input */
204 #define MSR_DDSR 0x02 /* Delta DSR */
205 #define MSR_DRIN 0x04 /* Delta RI */
206 #define MSR_DDCD 0x08 /* Delta DCD */
207 #define MSR_CTS 0x10 /* CTS input */
208 #define MSR_DSR 0x20 /* DSR input */
209 #define MSR_RING 0x40 /* RI input */
210 #define MSR_DCD 0x80 /* DCD input */
212 /* line status register bit mask */
217 #define LSR_BREAK 0x10
218 #define LSR_THRE 0x20
219 #define LSR_TSRE 0x40
221 /* Line Control Register Bit Masks */
222 #define LCR_DLAB 0x80
223 #define LCR_BREAK 0x40
224 #define LCR_PZERO 0x28
225 #define LCR_PEVEN 0x18
226 #define LCR_PODD 0x08
227 #define LCR_STOP1 0x00
228 #define LCR_STOP2 0x04
229 #define LCR_BIT5 0x00
230 #define LCR_BIT6 0x02
231 #define LCR_BIT7 0x01
232 #define LCR_BIT8 0x03
234 /* YAM Modem <-> UART Port mapping */
236 #define TX_RDY MSR_DCTS /* transmitter ready to send */
237 #define RX_DCD MSR_DCD /* carrier detect */
238 #define RX_FLAG MSR_RING /* hdlc flag received */
239 #define FPGA_DONE MSR_DSR /* FPGA is configured */
240 #define PTT_ON (MCR_RTS|MCR_OUT2) /* activate PTT */
241 #define PTT_OFF (MCR_DTR|MCR_OUT2) /* release PTT */
243 #define ENABLE_RXINT IER_RX /* enable uart rx interrupt during rx */
244 #define ENABLE_TXINT IER_MSR /* enable uart ms interrupt during tx */
245 #define ENABLE_RTXINT (IER_RX|IER_MSR) /* full duplex operations */
248 /*************************************************************************
250 ************************************************************************/
252 static const unsigned char chktabl[256] =
253 {0x00, 0x89, 0x12, 0x9b, 0x24, 0xad, 0x36, 0xbf, 0x48, 0xc1, 0x5a, 0xd3, 0x6c, 0xe5, 0x7e,
254 0xf7, 0x81, 0x08, 0x93, 0x1a, 0xa5, 0x2c, 0xb7, 0x3e, 0xc9, 0x40, 0xdb, 0x52, 0xed, 0x64,
255 0xff, 0x76, 0x02, 0x8b, 0x10, 0x99, 0x26, 0xaf, 0x34, 0xbd, 0x4a, 0xc3, 0x58, 0xd1, 0x6e,
256 0xe7, 0x7c, 0xf5, 0x83, 0x0a, 0x91, 0x18, 0xa7, 0x2e, 0xb5, 0x3c, 0xcb, 0x42, 0xd9, 0x50,
257 0xef, 0x66, 0xfd, 0x74, 0x04, 0x8d, 0x16, 0x9f, 0x20, 0xa9, 0x32, 0xbb, 0x4c, 0xc5, 0x5e,
258 0xd7, 0x68, 0xe1, 0x7a, 0xf3, 0x85, 0x0c, 0x97, 0x1e, 0xa1, 0x28, 0xb3, 0x3a, 0xcd, 0x44,
259 0xdf, 0x56, 0xe9, 0x60, 0xfb, 0x72, 0x06, 0x8f, 0x14, 0x9d, 0x22, 0xab, 0x30, 0xb9, 0x4e,
260 0xc7, 0x5c, 0xd5, 0x6a, 0xe3, 0x78, 0xf1, 0x87, 0x0e, 0x95, 0x1c, 0xa3, 0x2a, 0xb1, 0x38,
261 0xcf, 0x46, 0xdd, 0x54, 0xeb, 0x62, 0xf9, 0x70, 0x08, 0x81, 0x1a, 0x93, 0x2c, 0xa5, 0x3e,
262 0xb7, 0x40, 0xc9, 0x52, 0xdb, 0x64, 0xed, 0x76, 0xff, 0x89, 0x00, 0x9b, 0x12, 0xad, 0x24,
263 0xbf, 0x36, 0xc1, 0x48, 0xd3, 0x5a, 0xe5, 0x6c, 0xf7, 0x7e, 0x0a, 0x83, 0x18, 0x91, 0x2e,
264 0xa7, 0x3c, 0xb5, 0x42, 0xcb, 0x50, 0xd9, 0x66, 0xef, 0x74, 0xfd, 0x8b, 0x02, 0x99, 0x10,
265 0xaf, 0x26, 0xbd, 0x34, 0xc3, 0x4a, 0xd1, 0x58, 0xe7, 0x6e, 0xf5, 0x7c, 0x0c, 0x85, 0x1e,
266 0x97, 0x28, 0xa1, 0x3a, 0xb3, 0x44, 0xcd, 0x56, 0xdf, 0x60, 0xe9, 0x72, 0xfb, 0x8d, 0x04,
267 0x9f, 0x16, 0xa9, 0x20, 0xbb, 0x32, 0xc5, 0x4c, 0xd7, 0x5e, 0xe1, 0x68, 0xf3, 0x7a, 0x0e,
268 0x87, 0x1c, 0x95, 0x2a, 0xa3, 0x38, 0xb1, 0x46, 0xcf, 0x54, 0xdd, 0x62, 0xeb, 0x70, 0xf9,
269 0x8f, 0x06, 0x9d, 0x14, 0xab, 0x22, 0xb9, 0x30, 0xc7, 0x4e, 0xd5, 0x5c, 0xe3, 0x6a, 0xf1,
271 static const unsigned char chktabh[256] =
272 {0x00, 0x11, 0x23, 0x32, 0x46, 0x57, 0x65, 0x74, 0x8c, 0x9d, 0xaf, 0xbe, 0xca, 0xdb, 0xe9,
273 0xf8, 0x10, 0x01, 0x33, 0x22, 0x56, 0x47, 0x75, 0x64, 0x9c, 0x8d, 0xbf, 0xae, 0xda, 0xcb,
274 0xf9, 0xe8, 0x21, 0x30, 0x02, 0x13, 0x67, 0x76, 0x44, 0x55, 0xad, 0xbc, 0x8e, 0x9f, 0xeb,
275 0xfa, 0xc8, 0xd9, 0x31, 0x20, 0x12, 0x03, 0x77, 0x66, 0x54, 0x45, 0xbd, 0xac, 0x9e, 0x8f,
276 0xfb, 0xea, 0xd8, 0xc9, 0x42, 0x53, 0x61, 0x70, 0x04, 0x15, 0x27, 0x36, 0xce, 0xdf, 0xed,
277 0xfc, 0x88, 0x99, 0xab, 0xba, 0x52, 0x43, 0x71, 0x60, 0x14, 0x05, 0x37, 0x26, 0xde, 0xcf,
278 0xfd, 0xec, 0x98, 0x89, 0xbb, 0xaa, 0x63, 0x72, 0x40, 0x51, 0x25, 0x34, 0x06, 0x17, 0xef,
279 0xfe, 0xcc, 0xdd, 0xa9, 0xb8, 0x8a, 0x9b, 0x73, 0x62, 0x50, 0x41, 0x35, 0x24, 0x16, 0x07,
280 0xff, 0xee, 0xdc, 0xcd, 0xb9, 0xa8, 0x9a, 0x8b, 0x84, 0x95, 0xa7, 0xb6, 0xc2, 0xd3, 0xe1,
281 0xf0, 0x08, 0x19, 0x2b, 0x3a, 0x4e, 0x5f, 0x6d, 0x7c, 0x94, 0x85, 0xb7, 0xa6, 0xd2, 0xc3,
282 0xf1, 0xe0, 0x18, 0x09, 0x3b, 0x2a, 0x5e, 0x4f, 0x7d, 0x6c, 0xa5, 0xb4, 0x86, 0x97, 0xe3,
283 0xf2, 0xc0, 0xd1, 0x29, 0x38, 0x0a, 0x1b, 0x6f, 0x7e, 0x4c, 0x5d, 0xb5, 0xa4, 0x96, 0x87,
284 0xf3, 0xe2, 0xd0, 0xc1, 0x39, 0x28, 0x1a, 0x0b, 0x7f, 0x6e, 0x5c, 0x4d, 0xc6, 0xd7, 0xe5,
285 0xf4, 0x80, 0x91, 0xa3, 0xb2, 0x4a, 0x5b, 0x69, 0x78, 0x0c, 0x1d, 0x2f, 0x3e, 0xd6, 0xc7,
286 0xf5, 0xe4, 0x90, 0x81, 0xb3, 0xa2, 0x5a, 0x4b, 0x79, 0x68, 0x1c, 0x0d, 0x3f, 0x2e, 0xe7,
287 0xf6, 0xc4, 0xd5, 0xa1, 0xb0, 0x82, 0x93, 0x6b, 0x7a, 0x48, 0x59, 0x2d, 0x3c, 0x0e, 0x1f,
288 0xf7, 0xe6, 0xd4, 0xc5, 0xb1, 0xa0, 0x92, 0x83, 0x7b, 0x6a, 0x58, 0x49, 0x3d, 0x2c, 0x1e,
291 /*************************************************************************
293 ************************************************************************/
295 static void delay(int ms)
297 unsigned long timeout = jiffies + ((ms * HZ) / 1000);
298 while (time_before(jiffies, timeout))
306 static void fpga_reset(int iobase)
308 outb(0, IER(iobase));
309 outb(LCR_DLAB | LCR_BIT5, LCR(iobase));
310 outb(1, DLL(iobase));
311 outb(0, DLM(iobase));
313 outb(LCR_BIT5, LCR(iobase));
316 /* turn off FPGA supply voltage */
317 outb(MCR_OUT1 | MCR_OUT2, MCR(iobase));
319 /* turn on FPGA supply voltage again */
320 outb(MCR_DTR | MCR_RTS | MCR_OUT1 | MCR_OUT2, MCR(iobase));
325 * send one byte to FPGA
328 static int fpga_write(int iobase, unsigned char wrd)
332 unsigned long timeout = jiffies + HZ / 10;
334 for (k = 0; k < 8; k++) {
335 bit = (wrd & 0x80) ? (MCR_RTS | MCR_DTR) : MCR_DTR;
336 outb(bit | MCR_OUT1 | MCR_OUT2, MCR(iobase));
338 outb(0xfc, THR(iobase));
339 while ((inb(LSR(iobase)) & LSR_TSRE) == 0)
340 if (time_after(jiffies, timeout))
347 static unsigned char *add_mcs(unsigned char *bits, int bitrate)
351 /* If it already exists, replace the bit data */
354 if (p->bitrate == bitrate) {
355 memcpy(p->bits, bits, YAM_FPGA_SIZE);
361 /* Allocate a new mcs */
362 if ((p = kmalloc(sizeof(struct yam_mcs), GFP_KERNEL)) == NULL) {
363 printk(KERN_WARNING "YAM: no memory to allocate mcs\n");
366 memcpy(p->bits, bits, YAM_FPGA_SIZE);
367 p->bitrate = bitrate;
374 static unsigned char *get_mcs(int bitrate)
380 if (p->bitrate == bitrate)
385 /* Load predefined mcs data */
388 return add_mcs(bits_1200, bitrate);
390 return add_mcs(bits_9600, bitrate);
395 * download bitstream to FPGA
396 * data is contained in bits[] array in yam1200.h resp. yam9600.h
399 static int fpga_download(int iobase, int bitrate)
402 unsigned char *pbits;
404 pbits = get_mcs(bitrate);
409 for (i = 0; i < YAM_FPGA_SIZE; i++) {
410 if (fpga_write(iobase, pbits[i])) {
411 printk(KERN_ERR "yam: error in write cycle\n");
412 return -1; /* write... */
416 fpga_write(iobase, 0xFF);
417 rc = inb(MSR(iobase)); /* check DONE signal */
419 /* Needed for some hardwares */
422 return (rc & MSR_DSR) ? 0 : -1;
426 /************************************************************************
428 ************************************************************************/
430 static void yam_set_uart(struct net_device *dev)
432 struct yam_port *yp = netdev_priv(dev);
433 int divisor = 115200 / yp->baudrate;
435 outb(0, IER(dev->base_addr));
436 outb(LCR_DLAB | LCR_BIT8, LCR(dev->base_addr));
437 outb(divisor, DLL(dev->base_addr));
438 outb(0, DLM(dev->base_addr));
439 outb(LCR_BIT8, LCR(dev->base_addr));
440 outb(PTT_OFF, MCR(dev->base_addr));
441 outb(0x00, FCR(dev->base_addr));
443 /* Flush pending irq */
445 inb(RBR(dev->base_addr));
446 inb(MSR(dev->base_addr));
450 outb(ENABLE_RTXINT, IER(dev->base_addr));
454 /* --------------------------------------------------------------------- */
457 c_uart_unknown, c_uart_8250,
458 c_uart_16450, c_uart_16550, c_uart_16550A
461 static const char *uart_str[] =
462 {"unknown", "8250", "16450", "16550", "16550A"};
464 static enum uart yam_check_uart(unsigned int iobase)
466 unsigned char b1, b2, b3;
468 enum uart uart_tab[] =
469 {c_uart_16450, c_uart_unknown, c_uart_16550, c_uart_16550A};
471 b1 = inb(MCR(iobase));
472 outb(b1 | 0x10, MCR(iobase)); /* loopback mode */
473 b2 = inb(MSR(iobase));
474 outb(0x1a, MCR(iobase));
475 b3 = inb(MSR(iobase)) & 0xf0;
476 outb(b1, MCR(iobase)); /* restore old values */
477 outb(b2, MSR(iobase));
479 return c_uart_unknown;
482 outb(0x01, FCR(iobase)); /* enable FIFOs */
483 u = uart_tab[(inb(IIR(iobase)) >> 6) & 3];
484 if (u == c_uart_16450) {
485 outb(0x5a, SCR(iobase));
486 b1 = inb(SCR(iobase));
487 outb(0xa5, SCR(iobase));
488 b2 = inb(SCR(iobase));
489 if ((b1 != 0x5a) || (b2 != 0xa5))
495 /******************************************************************************
497 ******************************************************************************/
498 static inline void yam_rx_flag(struct net_device *dev, struct yam_port *yp)
500 if (yp->dcd && yp->rx_len >= 3 && yp->rx_len < YAM_MAX_FRAME) {
501 int pkt_len = yp->rx_len - 2 + 1; /* -CRC + kiss */
504 if ((yp->rx_crch & yp->rx_crcl) != 0xFF) {
507 if (!(skb = dev_alloc_skb(pkt_len))) {
508 printk(KERN_WARNING "%s: memory squeeze, dropping packet\n", dev->name);
509 ++yp->stats.rx_dropped;
512 cp = skb_put(skb, pkt_len);
513 *cp++ = 0; /* KISS kludge */
514 memcpy(cp, yp->rx_buf, pkt_len - 1);
515 skb->protocol = ax25_type_trans(skb, dev);
517 dev->last_rx = jiffies;
518 ++yp->stats.rx_packets;
527 static inline void yam_rx_byte(struct net_device *dev, struct yam_port *yp, unsigned char rxb)
529 if (yp->rx_len < YAM_MAX_FRAME) {
530 unsigned char c = yp->rx_crcl;
531 yp->rx_crcl = (chktabl[c] ^ yp->rx_crch);
532 yp->rx_crch = (chktabh[c] ^ rxb);
533 yp->rx_buf[yp->rx_len++] = rxb;
537 /********************************************************************************
539 ********************************************************************************/
541 static void ptt_on(struct net_device *dev)
543 outb(PTT_ON, MCR(dev->base_addr));
546 static void ptt_off(struct net_device *dev)
548 outb(PTT_OFF, MCR(dev->base_addr));
551 static int yam_send_packet(struct sk_buff *skb, struct net_device *dev)
553 struct yam_port *yp = netdev_priv(dev);
555 skb_queue_tail(&yp->send_queue, skb);
556 dev->trans_start = jiffies;
560 static void yam_start_tx(struct net_device *dev, struct yam_port *yp)
562 if ((yp->tx_state == TX_TAIL) || (yp->txd == 0))
565 yp->tx_count = (yp->bitrate * yp->txd) / 8000;
566 yp->tx_state = TX_HEAD;
570 static void yam_arbitrate(struct net_device *dev)
572 struct yam_port *yp = netdev_priv(dev);
574 if (yp->magic != YAM_MAGIC || yp->tx_state != TX_OFF ||
575 skb_queue_empty(&yp->send_queue))
577 /* tx_state is TX_OFF and there is data to send */
580 /* Full duplex mode, don't wait */
581 yam_start_tx(dev, yp);
585 /* DCD on, wait slotime ... */
586 yp->slotcnt = yp->slot / 10;
589 /* Is slottime passed ? */
590 if ((--yp->slotcnt) > 0)
593 yp->slotcnt = yp->slot / 10;
595 /* is random > persist ? */
596 if ((random32() % 256) > yp->pers)
599 yam_start_tx(dev, yp);
602 static void yam_dotimer(unsigned long dummy)
606 for (i = 0; i < NR_PORTS; i++) {
607 struct net_device *dev = yam_devs[i];
608 if (dev && netif_running(dev))
611 yam_timer.expires = jiffies + HZ / 100;
612 add_timer(&yam_timer);
615 static void yam_tx_byte(struct net_device *dev, struct yam_port *yp)
618 unsigned char b, temp;
620 switch (yp->tx_state) {
624 if (--yp->tx_count <= 0) {
625 if (!(skb = skb_dequeue(&yp->send_queue))) {
627 yp->tx_state = TX_OFF;
630 yp->tx_state = TX_DATA;
631 if (skb->data[0] != 0) {
632 /* do_kiss_params(s, skb->data, skb->len); */
633 dev_kfree_skb_any(skb);
636 yp->tx_len = skb->len - 1; /* strip KISS byte */
637 if (yp->tx_len >= YAM_MAX_FRAME || yp->tx_len < 2) {
638 dev_kfree_skb_any(skb);
641 memcpy(yp->tx_buf, skb->data + 1, yp->tx_len);
642 dev_kfree_skb_any(skb);
646 yp->tx_state = TX_DATA;
650 b = yp->tx_buf[yp->tx_count++];
651 outb(b, THR(dev->base_addr));
653 yp->tx_crcl = chktabl[temp] ^ yp->tx_crch;
654 yp->tx_crch = chktabh[temp] ^ b;
655 if (yp->tx_count >= yp->tx_len) {
656 yp->tx_state = TX_CRC1;
660 yp->tx_crch = chktabl[yp->tx_crcl] ^ yp->tx_crch;
661 yp->tx_crcl = chktabh[yp->tx_crcl] ^ chktabl[yp->tx_crch] ^ 0xff;
662 outb(yp->tx_crcl, THR(dev->base_addr));
663 yp->tx_state = TX_CRC2;
666 outb(chktabh[yp->tx_crch] ^ 0xFF, THR(dev->base_addr));
667 if (skb_queue_empty(&yp->send_queue)) {
668 yp->tx_count = (yp->bitrate * yp->txtail) / 8000;
669 if (yp->dupmode == 2)
670 yp->tx_count += (yp->bitrate * yp->holdd) / 8;
671 if (yp->tx_count == 0)
673 yp->tx_state = TX_TAIL;
676 yp->tx_state = TX_HEAD;
678 ++yp->stats.tx_packets;
681 if (--yp->tx_count <= 0) {
682 yp->tx_state = TX_OFF;
689 /***********************************************************************************
691 ************************************************************************************/
693 static irqreturn_t yam_interrupt(int irq, void *dev_id)
695 struct net_device *dev;
702 for (i = 0; i < NR_PORTS; i++) {
704 yp = netdev_priv(dev);
706 if (!netif_running(dev))
709 while ((iir = IIR_MASK & inb(IIR(dev->base_addr))) != IIR_NOPEND) {
710 unsigned char msr = inb(MSR(dev->base_addr));
711 unsigned char lsr = inb(LSR(dev->base_addr));
717 ++yp->stats.rx_fifo_errors;
719 yp->dcd = (msr & RX_DCD) ? 1 : 0;
721 if (--counter <= 0) {
722 printk(KERN_ERR "%s: too many irq iir=%d\n",
728 yam_tx_byte(dev, yp);
732 rxb = inb(RBR(dev->base_addr));
734 yam_rx_flag(dev, yp);
736 yam_rx_byte(dev, yp, rxb);
741 return IRQ_RETVAL(handled);
744 #ifdef CONFIG_PROC_FS
746 static void *yam_seq_start(struct seq_file *seq, loff_t *pos)
748 return (*pos < NR_PORTS) ? yam_devs[*pos] : NULL;
751 static void *yam_seq_next(struct seq_file *seq, void *v, loff_t *pos)
754 return (*pos < NR_PORTS) ? yam_devs[*pos] : NULL;
757 static void yam_seq_stop(struct seq_file *seq, void *v)
761 static int yam_seq_show(struct seq_file *seq, void *v)
763 struct net_device *dev = v;
764 const struct yam_port *yp = netdev_priv(dev);
766 seq_printf(seq, "Device %s\n", dev->name);
767 seq_printf(seq, " Up %d\n", netif_running(dev));
768 seq_printf(seq, " Speed %u\n", yp->bitrate);
769 seq_printf(seq, " IoBase 0x%x\n", yp->iobase);
770 seq_printf(seq, " BaudRate %u\n", yp->baudrate);
771 seq_printf(seq, " IRQ %u\n", yp->irq);
772 seq_printf(seq, " TxState %u\n", yp->tx_state);
773 seq_printf(seq, " Duplex %u\n", yp->dupmode);
774 seq_printf(seq, " HoldDly %u\n", yp->holdd);
775 seq_printf(seq, " TxDelay %u\n", yp->txd);
776 seq_printf(seq, " TxTail %u\n", yp->txtail);
777 seq_printf(seq, " SlotTime %u\n", yp->slot);
778 seq_printf(seq, " Persist %u\n", yp->pers);
779 seq_printf(seq, " TxFrames %lu\n", yp->stats.tx_packets);
780 seq_printf(seq, " RxFrames %lu\n", yp->stats.rx_packets);
781 seq_printf(seq, " TxInt %u\n", yp->nb_mdint);
782 seq_printf(seq, " RxInt %u\n", yp->nb_rxint);
783 seq_printf(seq, " RxOver %lu\n", yp->stats.rx_fifo_errors);
784 seq_printf(seq, "\n");
788 static struct seq_operations yam_seqops = {
789 .start = yam_seq_start,
790 .next = yam_seq_next,
791 .stop = yam_seq_stop,
792 .show = yam_seq_show,
795 static int yam_info_open(struct inode *inode, struct file *file)
797 return seq_open(file, &yam_seqops);
800 static const struct file_operations yam_info_fops = {
801 .owner = THIS_MODULE,
802 .open = yam_info_open,
805 .release = seq_release,
811 /* --------------------------------------------------------------------- */
813 static struct net_device_stats *yam_get_stats(struct net_device *dev)
820 yp = netdev_priv(dev);
821 if (yp->magic != YAM_MAGIC)
825 * Get the current statistics. This may be called with the
826 * card open or closed.
831 /* --------------------------------------------------------------------- */
833 static int yam_open(struct net_device *dev)
835 struct yam_port *yp = netdev_priv(dev);
840 printk(KERN_INFO "Trying %s at iobase 0x%lx irq %u\n", dev->name, dev->base_addr, dev->irq);
842 if (!dev || !yp->bitrate)
844 if (!dev->base_addr || dev->base_addr > 0x1000 - YAM_EXTENT ||
845 dev->irq < 2 || dev->irq > 15) {
848 if (!request_region(dev->base_addr, YAM_EXTENT, dev->name))
850 printk(KERN_ERR "%s: cannot 0x%lx busy\n", dev->name, dev->base_addr);
853 if ((u = yam_check_uart(dev->base_addr)) == c_uart_unknown) {
854 printk(KERN_ERR "%s: cannot find uart type\n", dev->name);
856 goto out_release_base;
858 if (fpga_download(dev->base_addr, yp->bitrate)) {
859 printk(KERN_ERR "%s: cannot init FPGA\n", dev->name);
861 goto out_release_base;
863 outb(0, IER(dev->base_addr));
864 if (request_irq(dev->irq, yam_interrupt, IRQF_DISABLED | IRQF_SHARED, dev->name, dev)) {
865 printk(KERN_ERR "%s: irq %d busy\n", dev->name, dev->irq);
867 goto out_release_base;
872 netif_start_queue(dev);
874 yp->slotcnt = yp->slot / 10;
876 /* Reset overruns for all ports - FPGA programming makes overruns */
877 for (i = 0; i < NR_PORTS; i++) {
878 struct net_device *dev = yam_devs[i];
879 struct yam_port *yp = netdev_priv(dev);
880 inb(LSR(dev->base_addr));
881 yp->stats.rx_fifo_errors = 0;
884 printk(KERN_INFO "%s at iobase 0x%lx irq %u uart %s\n", dev->name, dev->base_addr, dev->irq,
889 release_region(dev->base_addr, YAM_EXTENT);
893 /* --------------------------------------------------------------------- */
895 static int yam_close(struct net_device *dev)
898 struct yam_port *yp = netdev_priv(dev);
906 outb(0, IER(dev->base_addr));
907 outb(1, MCR(dev->base_addr));
908 /* Remove IRQ handler if last */
909 free_irq(dev->irq,dev);
910 release_region(dev->base_addr, YAM_EXTENT);
911 netif_stop_queue(dev);
912 while ((skb = skb_dequeue(&yp->send_queue)))
915 printk(KERN_INFO "%s: close yam at iobase 0x%lx irq %u\n",
916 yam_drvname, dev->base_addr, dev->irq);
920 /* --------------------------------------------------------------------- */
922 static int yam_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
924 struct yam_port *yp = netdev_priv(dev);
925 struct yamdrv_ioctl_cfg yi;
926 struct yamdrv_ioctl_mcs *ym;
929 if (copy_from_user(&ioctl_cmd, ifr->ifr_data, sizeof(int)))
932 if (yp->magic != YAM_MAGIC)
935 if (!capable(CAP_NET_ADMIN))
938 if (cmd != SIOCDEVPRIVATE)
943 case SIOCYAMRESERVED:
944 return -EINVAL; /* unused */
947 if (netif_running(dev))
948 return -EINVAL; /* Cannot change this parameter when up */
949 if ((ym = kmalloc(sizeof(struct yamdrv_ioctl_mcs), GFP_KERNEL)) == NULL)
952 if (copy_from_user(ym, ifr->ifr_data, sizeof(struct yamdrv_ioctl_mcs))) {
956 if (ym->bitrate > YAM_MAXBITRATE) {
960 add_mcs(ym->bits, ym->bitrate);
965 if (!capable(CAP_SYS_RAWIO))
967 if (copy_from_user(&yi, ifr->ifr_data, sizeof(struct yamdrv_ioctl_cfg)))
970 if ((yi.cfg.mask & YAM_IOBASE) && netif_running(dev))
971 return -EINVAL; /* Cannot change this parameter when up */
972 if ((yi.cfg.mask & YAM_IRQ) && netif_running(dev))
973 return -EINVAL; /* Cannot change this parameter when up */
974 if ((yi.cfg.mask & YAM_BITRATE) && netif_running(dev))
975 return -EINVAL; /* Cannot change this parameter when up */
976 if ((yi.cfg.mask & YAM_BAUDRATE) && netif_running(dev))
977 return -EINVAL; /* Cannot change this parameter when up */
979 if (yi.cfg.mask & YAM_IOBASE) {
980 yp->iobase = yi.cfg.iobase;
981 dev->base_addr = yi.cfg.iobase;
983 if (yi.cfg.mask & YAM_IRQ) {
986 yp->irq = yi.cfg.irq;
987 dev->irq = yi.cfg.irq;
989 if (yi.cfg.mask & YAM_BITRATE) {
990 if (yi.cfg.bitrate > YAM_MAXBITRATE)
992 yp->bitrate = yi.cfg.bitrate;
994 if (yi.cfg.mask & YAM_BAUDRATE) {
995 if (yi.cfg.baudrate > YAM_MAXBAUDRATE)
997 yp->baudrate = yi.cfg.baudrate;
999 if (yi.cfg.mask & YAM_MODE) {
1000 if (yi.cfg.mode > YAM_MAXMODE)
1002 yp->dupmode = yi.cfg.mode;
1004 if (yi.cfg.mask & YAM_HOLDDLY) {
1005 if (yi.cfg.holddly > YAM_MAXHOLDDLY)
1007 yp->holdd = yi.cfg.holddly;
1009 if (yi.cfg.mask & YAM_TXDELAY) {
1010 if (yi.cfg.txdelay > YAM_MAXTXDELAY)
1012 yp->txd = yi.cfg.txdelay;
1014 if (yi.cfg.mask & YAM_TXTAIL) {
1015 if (yi.cfg.txtail > YAM_MAXTXTAIL)
1017 yp->txtail = yi.cfg.txtail;
1019 if (yi.cfg.mask & YAM_PERSIST) {
1020 if (yi.cfg.persist > YAM_MAXPERSIST)
1022 yp->pers = yi.cfg.persist;
1024 if (yi.cfg.mask & YAM_SLOTTIME) {
1025 if (yi.cfg.slottime > YAM_MAXSLOTTIME)
1027 yp->slot = yi.cfg.slottime;
1028 yp->slotcnt = yp->slot / 10;
1033 yi.cfg.mask = 0xffffffff;
1034 yi.cfg.iobase = yp->iobase;
1035 yi.cfg.irq = yp->irq;
1036 yi.cfg.bitrate = yp->bitrate;
1037 yi.cfg.baudrate = yp->baudrate;
1038 yi.cfg.mode = yp->dupmode;
1039 yi.cfg.txdelay = yp->txd;
1040 yi.cfg.holddly = yp->holdd;
1041 yi.cfg.txtail = yp->txtail;
1042 yi.cfg.persist = yp->pers;
1043 yi.cfg.slottime = yp->slot;
1044 if (copy_to_user(ifr->ifr_data, &yi, sizeof(struct yamdrv_ioctl_cfg)))
1056 /* --------------------------------------------------------------------- */
1058 static int yam_set_mac_address(struct net_device *dev, void *addr)
1060 struct sockaddr *sa = (struct sockaddr *) addr;
1062 /* addr is an AX.25 shifted ASCII mac address */
1063 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
1067 /* --------------------------------------------------------------------- */
1069 static void yam_setup(struct net_device *dev)
1071 struct yam_port *yp = netdev_priv(dev);
1073 yp->magic = YAM_MAGIC;
1074 yp->bitrate = DEFAULT_BITRATE;
1075 yp->baudrate = DEFAULT_BITRATE * 2;
1079 yp->holdd = DEFAULT_HOLDD;
1080 yp->txd = DEFAULT_TXD;
1081 yp->txtail = DEFAULT_TXTAIL;
1082 yp->slot = DEFAULT_SLOT;
1083 yp->pers = DEFAULT_PERS;
1086 dev->base_addr = yp->iobase;
1089 dev->open = yam_open;
1090 dev->stop = yam_close;
1091 dev->do_ioctl = yam_ioctl;
1092 dev->hard_start_xmit = yam_send_packet;
1093 dev->get_stats = yam_get_stats;
1095 skb_queue_head_init(&yp->send_queue);
1097 dev->hard_header = ax25_hard_header;
1098 dev->rebuild_header = ax25_rebuild_header;
1100 dev->set_mac_address = yam_set_mac_address;
1102 dev->type = ARPHRD_AX25;
1103 dev->hard_header_len = AX25_MAX_HEADER_LEN;
1104 dev->mtu = AX25_MTU;
1105 dev->addr_len = AX25_ADDR_LEN;
1106 memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN);
1107 memcpy(dev->dev_addr, &ax25_defaddr, AX25_ADDR_LEN);
1110 static int __init yam_init_driver(void)
1112 struct net_device *dev;
1114 char name[IFNAMSIZ];
1116 printk(yam_drvinfo);
1118 for (i = 0; i < NR_PORTS; i++) {
1119 sprintf(name, "yam%d", i);
1121 dev = alloc_netdev(sizeof(struct yam_port), name,
1124 printk(KERN_ERR "yam: cannot allocate net device %s\n",
1130 err = register_netdev(dev);
1132 printk(KERN_WARNING "yam: cannot register net device %s\n", dev->name);
1139 yam_timer.function = yam_dotimer;
1140 yam_timer.expires = jiffies + HZ / 100;
1141 add_timer(&yam_timer);
1143 proc_net_fops_create("yam", S_IRUGO, &yam_info_fops);
1147 unregister_netdev(yam_devs[i]);
1148 free_netdev(yam_devs[i]);
1153 /* --------------------------------------------------------------------- */
1155 static void __exit yam_cleanup_driver(void)
1160 del_timer(&yam_timer);
1161 for (i = 0; i < NR_PORTS; i++) {
1162 struct net_device *dev = yam_devs[i];
1164 unregister_netdev(dev);
1171 yam_data = yam_data->next;
1175 proc_net_remove("yam");
1178 /* --------------------------------------------------------------------- */
1180 MODULE_AUTHOR("Frederic Rible F1OAT frible@teaser.fr");
1181 MODULE_DESCRIPTION("Yam amateur radio modem driver");
1182 MODULE_LICENSE("GPL");
1184 module_init(yam_init_driver);
1185 module_exit(yam_cleanup_driver);
1187 /* --------------------------------------------------------------------- */