drivers/net/hamradio/yam.c

   1 /*****************************************************************************/
   2
   3 /*
   4  *    yam.c  -- YAM radio modem driver.
   5  *
   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)
   8  *
   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.
  13  *
  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.
  18  *
  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.
  22  *
  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.
  26  *
  27  *
  28  *  History:
  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)
  40  *
  41  */
  42
  43 /*****************************************************************************/
  44
  45 #include <linux/module.h>
  46 #include <linux/types.h>
  47 #include <linux/net.h>
  48 #include <linux/in.h>
  49 #include <linux/if.h>
  50 #include <linux/slab.h>
  51 #include <linux/errno.h>
  52 #include <linux/bitops.h>
  53 #include <linux/random.h>
  54 #include <asm/io.h>
  55 #include <asm/system.h>
  56 #include <linux/interrupt.h>
  57 #include <linux/ioport.h>
  58 #include <linux/firmware.h>
  59 #include <linux/platform_device.h>
  60
  61 #include <linux/netdevice.h>
  62 #include <linux/if_arp.h>
  63 #include <linux/etherdevice.h>
  64 #include <linux/skbuff.h>
  65 #include <net/ax25.h>
  66
  67 #include <linux/kernel.h>
  68 #include <linux/proc_fs.h>
  69 #include <linux/seq_file.h>
  70 #include <net/net_namespace.h>
  71
  72 #include <asm/uaccess.h>
  73 #include <linux/init.h>
  74
  75 #include <linux/yam.h>
  76
  77 /* --------------------------------------------------------------------- */
  78
  79 static const char yam_drvname[] = "yam";
  80 static const char yam_drvinfo[] __initdata = KERN_INFO \
  81         "YAM driver version 0.8 by F1OAT/F6FBB\n";
  82
  83 /* --------------------------------------------------------------------- */
  84
  85 #define FIRMWARE_9600   "yam/9600.bin"
  86 #define FIRMWARE_1200   "yam/1200.bin"
  87
  88 #define YAM_9600        1
  89 #define YAM_1200        2
  90
  91 #define NR_PORTS        4
  92 #define YAM_MAGIC       0xF10A7654
  93
  94 /* Transmitter states */
  95
  96 #define TX_OFF          0
  97 #define TX_HEAD         1
  98 #define TX_DATA         2
  99 #define TX_CRC1         3
 100 #define TX_CRC2         4
 101 #define TX_TAIL         5
 102
 103 #define YAM_MAX_FRAME   1024
 104
 105 #define DEFAULT_BITRATE 9600                    /* bps */
 106 #define DEFAULT_HOLDD   10                      /* sec */
 107 #define DEFAULT_TXD     300                     /* ms */
 108 #define DEFAULT_TXTAIL  10                      /* ms */
 109 #define DEFAULT_SLOT    100                     /* ms */
 110 #define DEFAULT_PERS    64                      /* 0->255 */
 111
 112 struct yam_port {
 113         int magic;
 114         int bitrate;
 115         int baudrate;
 116         int iobase;
 117         int irq;
 118         int dupmode;
 119
 120         struct net_device *dev;
 121
 122         int nb_rxint;
 123         int nb_mdint;
 124
 125         /* Parameters section */
 126
 127         int txd;                                /* tx delay */
 128         int holdd;                              /* duplex ptt delay */
 129         int txtail;                             /* txtail delay */
 130         int slot;                               /* slottime */
 131         int pers;                               /* persistence */
 132
 133         /* Tx section */
 134
 135         int tx_state;
 136         int tx_count;
 137         int slotcnt;
 138         unsigned char tx_buf[YAM_MAX_FRAME];
 139         int tx_len;
 140         int tx_crcl, tx_crch;
 141         struct sk_buff_head send_queue;         /* Packets awaiting transmission */
 142
 143         /* Rx section */
 144
 145         int dcd;
 146         unsigned char rx_buf[YAM_MAX_FRAME];
 147         int rx_len;
 148         int rx_crcl, rx_crch;
 149 };
 150
 151 struct yam_mcs {
 152         unsigned char bits[YAM_FPGA_SIZE];
 153         int bitrate;
 154         struct yam_mcs *next;
 155 };
 156
 157 static struct net_device *yam_devs[NR_PORTS];
 158
 159 static struct yam_mcs *yam_data;
 160
 161 static DEFINE_TIMER(yam_timer, NULL, 0, 0);
 162
 163 /* --------------------------------------------------------------------- */
 164
 165 #define RBR(iobase)     (iobase+0)
 166 #define THR(iobase)     (iobase+0)
 167 #define IER(iobase)     (iobase+1)
 168 #define IIR(iobase)     (iobase+2)
 169 #define FCR(iobase)     (iobase+2)
 170 #define LCR(iobase)     (iobase+3)
 171 #define MCR(iobase)     (iobase+4)
 172 #define LSR(iobase)     (iobase+5)
 173 #define MSR(iobase)     (iobase+6)
 174 #define SCR(iobase)     (iobase+7)
 175 #define DLL(iobase)     (iobase+0)
 176 #define DLM(iobase)     (iobase+1)
 177
 178 #define YAM_EXTENT      8
 179
 180 /* Interrupt Identification Register Bit Masks */
 181 #define IIR_NOPEND      1
 182 #define IIR_MSR         0
 183 #define IIR_TX          2
 184 #define IIR_RX          4
 185 #define IIR_LSR         6
 186 #define IIR_TIMEOUT     12                      /* Fifo mode only */
 187
 188 #define IIR_MASK        0x0F
 189
 190 /* Interrupt Enable Register Bit Masks */
 191 #define IER_RX          1                       /* enable rx interrupt */
 192 #define IER_TX          2                       /* enable tx interrupt */
 193 #define IER_LSR         4                       /* enable line status interrupts */
 194 #define IER_MSR         8                       /* enable modem status interrupts */
 195
 196 /* Modem Control Register Bit Masks */
 197 #define MCR_DTR         0x01                    /* DTR output */
 198 #define MCR_RTS         0x02                    /* RTS output */
 199 #define MCR_OUT1        0x04                    /* OUT1 output (not accessible in RS232) */
 200 #define MCR_OUT2        0x08                    /* Master Interrupt enable (must be set on PCs) */
 201 #define MCR_LOOP        0x10                    /* Loopback enable */
 202
 203 /* Modem Status Register Bit Masks */
 204 #define MSR_DCTS        0x01                    /* Delta CTS input */
 205 #define MSR_DDSR        0x02                    /* Delta DSR */
 206 #define MSR_DRIN        0x04                    /* Delta RI */
 207 #define MSR_DDCD        0x08                    /* Delta DCD */
 208 #define MSR_CTS         0x10                    /* CTS input */
 209 #define MSR_DSR         0x20                    /* DSR input */
 210 #define MSR_RING        0x40                    /* RI  input */
 211 #define MSR_DCD         0x80                    /* DCD input */
 212
 213 /* line status register bit mask */
 214 #define LSR_RXC         0x01
 215 #define LSR_OE          0x02
 216 #define LSR_PE          0x04
 217 #define LSR_FE          0x08
 218 #define LSR_BREAK       0x10
 219 #define LSR_THRE        0x20
 220 #define LSR_TSRE        0x40
 221
 222 /* Line Control Register Bit Masks */
 223 #define LCR_DLAB        0x80
 224 #define LCR_BREAK       0x40
 225 #define LCR_PZERO       0x28
 226 #define LCR_PEVEN       0x18
 227 #define LCR_PODD        0x08
 228 #define LCR_STOP1       0x00
 229 #define LCR_STOP2       0x04
 230 #define LCR_BIT5        0x00
 231 #define LCR_BIT6        0x02
 232 #define LCR_BIT7        0x01
 233 #define LCR_BIT8        0x03
 234
 235 /* YAM Modem <-> UART Port mapping */
 236
 237 #define TX_RDY          MSR_DCTS                /* transmitter ready to send */
 238 #define RX_DCD          MSR_DCD                 /* carrier detect */
 239 #define RX_FLAG         MSR_RING                /* hdlc flag received */
 240 #define FPGA_DONE       MSR_DSR                 /* FPGA is configured */
 241 #define PTT_ON          (MCR_RTS|MCR_OUT2)      /* activate PTT */
 242 #define PTT_OFF         (MCR_DTR|MCR_OUT2)      /* release PTT */
 243
 244 #define ENABLE_RXINT    IER_RX                  /* enable uart rx interrupt during rx */
 245 #define ENABLE_TXINT    IER_MSR                 /* enable uart ms interrupt during tx */
 246 #define ENABLE_RTXINT   (IER_RX|IER_MSR)        /* full duplex operations */
 247
 248
 249 /*************************************************************************
 250 * CRC Tables
 251 ************************************************************************/
 252
 253 static const unsigned char chktabl[256] =
 254 {0x00, 0x89, 0x12, 0x9b, 0x24, 0xad, 0x36, 0xbf, 0x48, 0xc1, 0x5a, 0xd3, 0x6c, 0xe5, 0x7e,
 255  0xf7, 0x81, 0x08, 0x93, 0x1a, 0xa5, 0x2c, 0xb7, 0x3e, 0xc9, 0x40, 0xdb, 0x52, 0xed, 0x64,
 256  0xff, 0x76, 0x02, 0x8b, 0x10, 0x99, 0x26, 0xaf, 0x34, 0xbd, 0x4a, 0xc3, 0x58, 0xd1, 0x6e,
 257  0xe7, 0x7c, 0xf5, 0x83, 0x0a, 0x91, 0x18, 0xa7, 0x2e, 0xb5, 0x3c, 0xcb, 0x42, 0xd9, 0x50,
 258  0xef, 0x66, 0xfd, 0x74, 0x04, 0x8d, 0x16, 0x9f, 0x20, 0xa9, 0x32, 0xbb, 0x4c, 0xc5, 0x5e,
 259  0xd7, 0x68, 0xe1, 0x7a, 0xf3, 0x85, 0x0c, 0x97, 0x1e, 0xa1, 0x28, 0xb3, 0x3a, 0xcd, 0x44,
 260  0xdf, 0x56, 0xe9, 0x60, 0xfb, 0x72, 0x06, 0x8f, 0x14, 0x9d, 0x22, 0xab, 0x30, 0xb9, 0x4e,
 261  0xc7, 0x5c, 0xd5, 0x6a, 0xe3, 0x78, 0xf1, 0x87, 0x0e, 0x95, 0x1c, 0xa3, 0x2a, 0xb1, 0x38,
 262  0xcf, 0x46, 0xdd, 0x54, 0xeb, 0x62, 0xf9, 0x70, 0x08, 0x81, 0x1a, 0x93, 0x2c, 0xa5, 0x3e,
 263  0xb7, 0x40, 0xc9, 0x52, 0xdb, 0x64, 0xed, 0x76, 0xff, 0x89, 0x00, 0x9b, 0x12, 0xad, 0x24,
 264  0xbf, 0x36, 0xc1, 0x48, 0xd3, 0x5a, 0xe5, 0x6c, 0xf7, 0x7e, 0x0a, 0x83, 0x18, 0x91, 0x2e,
 265  0xa7, 0x3c, 0xb5, 0x42, 0xcb, 0x50, 0xd9, 0x66, 0xef, 0x74, 0xfd, 0x8b, 0x02, 0x99, 0x10,
 266  0xaf, 0x26, 0xbd, 0x34, 0xc3, 0x4a, 0xd1, 0x58, 0xe7, 0x6e, 0xf5, 0x7c, 0x0c, 0x85, 0x1e,
 267  0x97, 0x28, 0xa1, 0x3a, 0xb3, 0x44, 0xcd, 0x56, 0xdf, 0x60, 0xe9, 0x72, 0xfb, 0x8d, 0x04,
 268  0x9f, 0x16, 0xa9, 0x20, 0xbb, 0x32, 0xc5, 0x4c, 0xd7, 0x5e, 0xe1, 0x68, 0xf3, 0x7a, 0x0e,
 269  0x87, 0x1c, 0x95, 0x2a, 0xa3, 0x38, 0xb1, 0x46, 0xcf, 0x54, 0xdd, 0x62, 0xeb, 0x70, 0xf9,
 270  0x8f, 0x06, 0x9d, 0x14, 0xab, 0x22, 0xb9, 0x30, 0xc7, 0x4e, 0xd5, 0x5c, 0xe3, 0x6a, 0xf1,
 271  0x78};
 272 static const unsigned char chktabh[256] =
 273 {0x00, 0x11, 0x23, 0x32, 0x46, 0x57, 0x65, 0x74, 0x8c, 0x9d, 0xaf, 0xbe, 0xca, 0xdb, 0xe9,
 274  0xf8, 0x10, 0x01, 0x33, 0x22, 0x56, 0x47, 0x75, 0x64, 0x9c, 0x8d, 0xbf, 0xae, 0xda, 0xcb,
 275  0xf9, 0xe8, 0x21, 0x30, 0x02, 0x13, 0x67, 0x76, 0x44, 0x55, 0xad, 0xbc, 0x8e, 0x9f, 0xeb,
 276  0xfa, 0xc8, 0xd9, 0x31, 0x20, 0x12, 0x03, 0x77, 0x66, 0x54, 0x45, 0xbd, 0xac, 0x9e, 0x8f,
 277  0xfb, 0xea, 0xd8, 0xc9, 0x42, 0x53, 0x61, 0x70, 0x04, 0x15, 0x27, 0x36, 0xce, 0xdf, 0xed,
 278  0xfc, 0x88, 0x99, 0xab, 0xba, 0x52, 0x43, 0x71, 0x60, 0x14, 0x05, 0x37, 0x26, 0xde, 0xcf,
 279  0xfd, 0xec, 0x98, 0x89, 0xbb, 0xaa, 0x63, 0x72, 0x40, 0x51, 0x25, 0x34, 0x06, 0x17, 0xef,
 280  0xfe, 0xcc, 0xdd, 0xa9, 0xb8, 0x8a, 0x9b, 0x73, 0x62, 0x50, 0x41, 0x35, 0x24, 0x16, 0x07,
 281  0xff, 0xee, 0xdc, 0xcd, 0xb9, 0xa8, 0x9a, 0x8b, 0x84, 0x95, 0xa7, 0xb6, 0xc2, 0xd3, 0xe1,
 282  0xf0, 0x08, 0x19, 0x2b, 0x3a, 0x4e, 0x5f, 0x6d, 0x7c, 0x94, 0x85, 0xb7, 0xa6, 0xd2, 0xc3,
 283  0xf1, 0xe0, 0x18, 0x09, 0x3b, 0x2a, 0x5e, 0x4f, 0x7d, 0x6c, 0xa5, 0xb4, 0x86, 0x97, 0xe3,
 284  0xf2, 0xc0, 0xd1, 0x29, 0x38, 0x0a, 0x1b, 0x6f, 0x7e, 0x4c, 0x5d, 0xb5, 0xa4, 0x96, 0x87,
 285  0xf3, 0xe2, 0xd0, 0xc1, 0x39, 0x28, 0x1a, 0x0b, 0x7f, 0x6e, 0x5c, 0x4d, 0xc6, 0xd7, 0xe5,
 286  0xf4, 0x80, 0x91, 0xa3, 0xb2, 0x4a, 0x5b, 0x69, 0x78, 0x0c, 0x1d, 0x2f, 0x3e, 0xd6, 0xc7,
 287  0xf5, 0xe4, 0x90, 0x81, 0xb3, 0xa2, 0x5a, 0x4b, 0x79, 0x68, 0x1c, 0x0d, 0x3f, 0x2e, 0xe7,
 288  0xf6, 0xc4, 0xd5, 0xa1, 0xb0, 0x82, 0x93, 0x6b, 0x7a, 0x48, 0x59, 0x2d, 0x3c, 0x0e, 0x1f,
 289  0xf7, 0xe6, 0xd4, 0xc5, 0xb1, 0xa0, 0x92, 0x83, 0x7b, 0x6a, 0x58, 0x49, 0x3d, 0x2c, 0x1e,
 290  0x0f};
 291
 292 /*************************************************************************
 293 * FPGA functions
 294 ************************************************************************/
 295
 296 static void delay(int ms)
 297 {
 298         unsigned long timeout = jiffies + ((ms * HZ) / 1000);
 299         while (time_before(jiffies, timeout))
 300                 cpu_relax();
 301 }
 302
 303 /*
 304  * reset FPGA
 305  */
 306
 307 static void fpga_reset(int iobase)
 308 {
 309         outb(0, IER(iobase));
 310         outb(LCR_DLAB | LCR_BIT5, LCR(iobase));
 311         outb(1, DLL(iobase));
 312         outb(0, DLM(iobase));
 313
 314         outb(LCR_BIT5, LCR(iobase));
 315         inb(LSR(iobase));
 316         inb(MSR(iobase));
 317         /* turn off FPGA supply voltage */
 318         outb(MCR_OUT1 | MCR_OUT2, MCR(iobase));
 319         delay(100);
 320         /* turn on FPGA supply voltage again */
 321         outb(MCR_DTR | MCR_RTS | MCR_OUT1 | MCR_OUT2, MCR(iobase));
 322         delay(100);
 323 }
 324
 325 /*
 326  * send one byte to FPGA
 327  */
 328
 329 static int fpga_write(int iobase, unsigned char wrd)
 330 {
 331         unsigned char bit;
 332         int k;
 333         unsigned long timeout = jiffies + HZ / 10;
 334
 335         for (k = 0; k < 8; k++) {
 336                 bit = (wrd & 0x80) ? (MCR_RTS | MCR_DTR) : MCR_DTR;
 337                 outb(bit | MCR_OUT1 | MCR_OUT2, MCR(iobase));
 338                 wrd <<= 1;
 339                 outb(0xfc, THR(iobase));
 340                 while ((inb(LSR(iobase)) & LSR_TSRE) == 0)
 341                         if (time_after(jiffies, timeout))
 342                                 return -1;
 343         }
 344
 345         return 0;
 346 }
 347
 348 /*
 349  * predef should be 0 for loading user defined mcs
 350  * predef should be YAM_1200 for loading predef 1200 mcs
 351  * predef should be YAM_9600 for loading predef 9600 mcs
 352  */
 353 static unsigned char *add_mcs(unsigned char *bits, int bitrate,
 354                               unsigned int predef)
 355 {
 356         const char *fw_name[2] = {FIRMWARE_9600, FIRMWARE_1200};
 357         const struct firmware *fw;
 358         struct platform_device *pdev;
 359         struct yam_mcs *p;
 360         int err;
 361
 362         switch (predef) {
 363         case 0:
 364                 fw = NULL;
 365                 break;
 366         case YAM_1200:
 367         case YAM_9600:
 368                 predef--;
 369                 pdev = platform_device_register_simple("yam", 0, NULL, 0);
 370                 if (IS_ERR(pdev)) {
 371                         printk(KERN_ERR "yam: Failed to register firmware\n");
 372                         return NULL;
 373                 }
 374                 err = request_firmware(&fw, fw_name[predef], &pdev->dev);
 375                 platform_device_unregister(pdev);
 376                 if (err) {
 377                         printk(KERN_ERR "Failed to load firmware \"%s\"\n",
 378                                fw_name[predef]);
 379                         return NULL;
 380                 }
 381                 if (fw->size != YAM_FPGA_SIZE) {
 382                         printk(KERN_ERR "Bogus length %zu in firmware \"%s\"\n",
 383                                fw->size, fw_name[predef]);
 384                         release_firmware(fw);
 385                         return NULL;
 386                 }
 387                 bits = (unsigned char *)fw->data;
 388                 break;
 389         default:
 390                 printk(KERN_ERR "yam: Invalid predef number %u\n", predef);
 391                 return NULL;
 392         }
 393
 394         /* If it already exists, replace the bit data */
 395         p = yam_data;
 396         while (p) {
 397                 if (p->bitrate == bitrate) {
 398                         memcpy(p->bits, bits, YAM_FPGA_SIZE);
 399                         return p->bits;
 400                 }
 401                 p = p->next;
 402         }
 403
 404         /* Allocate a new mcs */
 405         if ((p = kmalloc(sizeof(struct yam_mcs), GFP_KERNEL)) == NULL) {
 406                 printk(KERN_WARNING "YAM: no memory to allocate mcs\n");
 407                 release_firmware(fw);
 408                 return NULL;
 409         }
 410         memcpy(p->bits, bits, YAM_FPGA_SIZE);
 411         p->bitrate = bitrate;
 412         p->next = yam_data;
 413         yam_data = p;
 414
 415         release_firmware(fw);
 416         return p->bits;
 417 }
 418
 419 static unsigned char *get_mcs(int bitrate)
 420 {
 421         struct yam_mcs *p;
 422
 423         p = yam_data;
 424         while (p) {
 425                 if (p->bitrate == bitrate)
 426                         return p->bits;
 427                 p = p->next;
 428         }
 429
 430         /* Load predefined mcs data */
 431         switch (bitrate) {
 432         case 1200:
 433                 /* setting predef as YAM_1200 for loading predef 1200 mcs */
 434                 return add_mcs(NULL, bitrate, YAM_1200);
 435         default:
 436                 /* setting predef as YAM_9600 for loading predef 9600 mcs */
 437                 return add_mcs(NULL, bitrate, YAM_9600);
 438         }
 439 }
 440
 441 /*
 442  * download bitstream to FPGA
 443  * data is contained in bits[] array in yam1200.h resp. yam9600.h
 444  */
 445
 446 static int fpga_download(int iobase, int bitrate)
 447 {
 448         int i, rc;
 449         unsigned char *pbits;
 450
 451         pbits = get_mcs(bitrate);
 452         if (pbits == NULL)
 453                 return -1;
 454
 455         fpga_reset(iobase);
 456         for (i = 0; i < YAM_FPGA_SIZE; i++) {
 457                 if (fpga_write(iobase, pbits[i])) {
 458                         printk(KERN_ERR "yam: error in write cycle\n");
 459                         return -1;                      /* write... */
 460                 }
 461         }
 462
 463         fpga_write(iobase, 0xFF);
 464         rc = inb(MSR(iobase));          /* check DONE signal */
 465
 466         /* Needed for some hardwares */
 467         delay(50);
 468
 469         return (rc & MSR_DSR) ? 0 : -1;
 470 }
 471
 472
 473 /************************************************************************
 474 * Serial port init
 475 ************************************************************************/
 476
 477 static void yam_set_uart(struct net_device *dev)
 478 {
 479         struct yam_port *yp = netdev_priv(dev);
 480         int divisor = 115200 / yp->baudrate;
 481
 482         outb(0, IER(dev->base_addr));
 483         outb(LCR_DLAB | LCR_BIT8, LCR(dev->base_addr));
 484         outb(divisor, DLL(dev->base_addr));
 485         outb(0, DLM(dev->base_addr));
 486         outb(LCR_BIT8, LCR(dev->base_addr));
 487         outb(PTT_OFF, MCR(dev->base_addr));
 488         outb(0x00, FCR(dev->base_addr));
 489
 490         /* Flush pending irq */
 491
 492         inb(RBR(dev->base_addr));
 493         inb(MSR(dev->base_addr));
 494
 495         /* Enable rx irq */
 496
 497         outb(ENABLE_RTXINT, IER(dev->base_addr));
 498 }
 499
 500
 501 /* --------------------------------------------------------------------- */
 502
 503 enum uart {
 504         c_uart_unknown, c_uart_8250,
 505         c_uart_16450, c_uart_16550, c_uart_16550A
 506 };
 507
 508 static const char *uart_str[] =
 509 {"unknown", "8250", "16450", "16550", "16550A"};
 510
 511 static enum uart yam_check_uart(unsigned int iobase)
 512 {
 513         unsigned char b1, b2, b3;
 514         enum uart u;
 515         enum uart uart_tab[] =
 516         {c_uart_16450, c_uart_unknown, c_uart_16550, c_uart_16550A};
 517
 518         b1 = inb(MCR(iobase));
 519         outb(b1 | 0x10, MCR(iobase));   /* loopback mode */
 520         b2 = inb(MSR(iobase));
 521         outb(0x1a, MCR(iobase));
 522         b3 = inb(MSR(iobase)) & 0xf0;
 523         outb(b1, MCR(iobase));          /* restore old values */
 524         outb(b2, MSR(iobase));
 525         if (b3 != 0x90)
 526                 return c_uart_unknown;
 527         inb(RBR(iobase));
 528         inb(RBR(iobase));
 529         outb(0x01, FCR(iobase));        /* enable FIFOs */
 530         u = uart_tab[(inb(IIR(iobase)) >> 6) & 3];
 531         if (u == c_uart_16450) {
 532                 outb(0x5a, SCR(iobase));
 533                 b1 = inb(SCR(iobase));
 534                 outb(0xa5, SCR(iobase));
 535                 b2 = inb(SCR(iobase));
 536                 if ((b1 != 0x5a) || (b2 != 0xa5))
 537                         u = c_uart_8250;
 538         }
 539         return u;
 540 }
 541
 542 /******************************************************************************
 543 * Rx Section
 544 ******************************************************************************/
 545 static inline void yam_rx_flag(struct net_device *dev, struct yam_port *yp)
 546 {
 547         if (yp->dcd && yp->rx_len >= 3 && yp->rx_len < YAM_MAX_FRAME) {
 548                 int pkt_len = yp->rx_len - 2 + 1;       /* -CRC + kiss */
 549                 struct sk_buff *skb;
 550
 551                 if ((yp->rx_crch & yp->rx_crcl) != 0xFF) {
 552                         /* Bad crc */
 553                 } else {
 554                         if (!(skb = dev_alloc_skb(pkt_len))) {
 555                                 printk(KERN_WARNING "%s: memory squeeze, dropping packet\n", dev->name);
 556                                 ++dev->stats.rx_dropped;
 557                         } else {
 558                                 unsigned char *cp;
 559                                 cp = skb_put(skb, pkt_len);
 560                                 *cp++ = 0;              /* KISS kludge */
 561                                 memcpy(cp, yp->rx_buf, pkt_len - 1);
 562                                 skb->protocol = ax25_type_trans(skb, dev);
 563                                 netif_rx(skb);
 564                                 ++dev->stats.rx_packets;
 565                         }
 566                 }
 567         }
 568         yp->rx_len = 0;
 569         yp->rx_crcl = 0x21;
 570         yp->rx_crch = 0xf3;
 571 }
 572
 573 static inline void yam_rx_byte(struct net_device *dev, struct yam_port *yp, unsigned char rxb)
 574 {
 575         if (yp->rx_len < YAM_MAX_FRAME) {
 576                 unsigned char c = yp->rx_crcl;
 577                 yp->rx_crcl = (chktabl[c] ^ yp->rx_crch);
 578                 yp->rx_crch = (chktabh[c] ^ rxb);
 579                 yp->rx_buf[yp->rx_len++] = rxb;
 580         }
 581 }
 582
 583 /********************************************************************************
 584 * TX Section
 585 ********************************************************************************/
 586
 587 static void ptt_on(struct net_device *dev)
 588 {
 589         outb(PTT_ON, MCR(dev->base_addr));
 590 }
 591
 592 static void ptt_off(struct net_device *dev)
 593 {
 594         outb(PTT_OFF, MCR(dev->base_addr));
 595 }
 596
 597 static int yam_send_packet(struct sk_buff *skb, struct net_device *dev)
 598 {
 599         struct yam_port *yp = netdev_priv(dev);
 600
 601         skb_queue_tail(&yp->send_queue, skb);
 602         dev->trans_start = jiffies;
 603         return 0;
 604 }
 605
 606 static void yam_start_tx(struct net_device *dev, struct yam_port *yp)
 607 {
 608         if ((yp->tx_state == TX_TAIL) || (yp->txd == 0))
 609                 yp->tx_count = 1;
 610         else
 611                 yp->tx_count = (yp->bitrate * yp->txd) / 8000;
 612         yp->tx_state = TX_HEAD;
 613         ptt_on(dev);
 614 }
 615
 616 static void yam_arbitrate(struct net_device *dev)
 617 {
 618         struct yam_port *yp = netdev_priv(dev);
 619
 620         if (yp->magic != YAM_MAGIC || yp->tx_state != TX_OFF ||
 621             skb_queue_empty(&yp->send_queue))
 622                 return;
 623         /* tx_state is TX_OFF and there is data to send */
 624
 625         if (yp->dupmode) {
 626                 /* Full duplex mode, don't wait */
 627                 yam_start_tx(dev, yp);
 628                 return;
 629         }
 630         if (yp->dcd) {
 631                 /* DCD on, wait slotime ... */
 632                 yp->slotcnt = yp->slot / 10;
 633                 return;
 634         }
 635         /* Is slottime passed ? */
 636         if ((--yp->slotcnt) > 0)
 637                 return;
 638
 639         yp->slotcnt = yp->slot / 10;
 640
 641         /* is random > persist ? */
 642         if ((random32() % 256) > yp->pers)
 643                 return;
 644
 645         yam_start_tx(dev, yp);
 646 }
 647
 648 static void yam_dotimer(unsigned long dummy)
 649 {
 650         int i;
 651
 652         for (i = 0; i < NR_PORTS; i++) {
 653                 struct net_device *dev = yam_devs[i];
 654                 if (dev && netif_running(dev))
 655                         yam_arbitrate(dev);
 656         }
 657         yam_timer.expires = jiffies + HZ / 100;
 658         add_timer(&yam_timer);
 659 }
 660
 661 static void yam_tx_byte(struct net_device *dev, struct yam_port *yp)
 662 {
 663         struct sk_buff *skb;
 664         unsigned char b, temp;
 665
 666         switch (yp->tx_state) {
 667         case TX_OFF:
 668                 break;
 669         case TX_HEAD:
 670                 if (--yp->tx_count <= 0) {
 671                         if (!(skb = skb_dequeue(&yp->send_queue))) {
 672                                 ptt_off(dev);
 673                                 yp->tx_state = TX_OFF;
 674                                 break;
 675                         }
 676                         yp->tx_state = TX_DATA;
 677                         if (skb->data[0] != 0) {
 678 /*                              do_kiss_params(s, skb->data, skb->len); */
 679                                 dev_kfree_skb_any(skb);
 680                                 break;
 681                         }
 682                         yp->tx_len = skb->len - 1;      /* strip KISS byte */
 683                         if (yp->tx_len >= YAM_MAX_FRAME || yp->tx_len < 2) {
 684                                 dev_kfree_skb_any(skb);
 685                                 break;
 686                         }
 687                         skb_copy_from_linear_data_offset(skb, 1,
 688                                                          yp->tx_buf,
 689                                                          yp->tx_len);
 690                         dev_kfree_skb_any(skb);
 691                         yp->tx_count = 0;
 692                         yp->tx_crcl = 0x21;
 693                         yp->tx_crch = 0xf3;
 694                         yp->tx_state = TX_DATA;
 695                 }
 696                 break;
 697         case TX_DATA:
 698                 b = yp->tx_buf[yp->tx_count++];
 699                 outb(b, THR(dev->base_addr));
 700                 temp = yp->tx_crcl;
 701                 yp->tx_crcl = chktabl[temp] ^ yp->tx_crch;
 702                 yp->tx_crch = chktabh[temp] ^ b;
 703                 if (yp->tx_count >= yp->tx_len) {
 704                         yp->tx_state = TX_CRC1;
 705                 }
 706                 break;
 707         case TX_CRC1:
 708                 yp->tx_crch = chktabl[yp->tx_crcl] ^ yp->tx_crch;
 709                 yp->tx_crcl = chktabh[yp->tx_crcl] ^ chktabl[yp->tx_crch] ^ 0xff;
 710                 outb(yp->tx_crcl, THR(dev->base_addr));
 711                 yp->tx_state = TX_CRC2;
 712                 break;
 713         case TX_CRC2:
 714                 outb(chktabh[yp->tx_crch] ^ 0xFF, THR(dev->base_addr));
 715                 if (skb_queue_empty(&yp->send_queue)) {
 716                         yp->tx_count = (yp->bitrate * yp->txtail) / 8000;
 717                         if (yp->dupmode == 2)
 718                                 yp->tx_count += (yp->bitrate * yp->holdd) / 8;
 719                         if (yp->tx_count == 0)
 720                                 yp->tx_count = 1;
 721                         yp->tx_state = TX_TAIL;
 722                 } else {
 723                         yp->tx_count = 1;
 724                         yp->tx_state = TX_HEAD;
 725                 }
 726                 ++dev->stats.tx_packets;
 727                 break;
 728         case TX_TAIL:
 729                 if (--yp->tx_count <= 0) {
 730                         yp->tx_state = TX_OFF;
 731                         ptt_off(dev);
 732                 }
 733                 break;
 734         }
 735 }
 736
 737 /***********************************************************************************
 738 * ISR routine
 739 ************************************************************************************/
 740
 741 static irqreturn_t yam_interrupt(int irq, void *dev_id)
 742 {
 743         struct net_device *dev;
 744         struct yam_port *yp;
 745         unsigned char iir;
 746         int counter = 100;
 747         int i;
 748         int handled = 0;
 749
 750         for (i = 0; i < NR_PORTS; i++) {
 751                 dev = yam_devs[i];
 752                 yp = netdev_priv(dev);
 753
 754                 if (!netif_running(dev))
 755                         continue;
 756
 757                 while ((iir = IIR_MASK & inb(IIR(dev->base_addr))) != IIR_NOPEND) {
 758                         unsigned char msr = inb(MSR(dev->base_addr));
 759                         unsigned char lsr = inb(LSR(dev->base_addr));
 760                         unsigned char rxb;
 761
 762                         handled = 1;
 763
 764                         if (lsr & LSR_OE)
 765                                 ++dev->stats.rx_fifo_errors;
 766
 767                         yp->dcd = (msr & RX_DCD) ? 1 : 0;
 768
 769                         if (--counter <= 0) {
 770                                 printk(KERN_ERR "%s: too many irq iir=%d\n",
 771                                                 dev->name, iir);
 772                                 goto out;
 773                         }
 774                         if (msr & TX_RDY) {
 775                                 ++yp->nb_mdint;
 776                                 yam_tx_byte(dev, yp);
 777                         }
 778                         if (lsr & LSR_RXC) {
 779                                 ++yp->nb_rxint;
 780                                 rxb = inb(RBR(dev->base_addr));
 781                                 if (msr & RX_FLAG)
 782                                         yam_rx_flag(dev, yp);
 783                                 else
 784                                         yam_rx_byte(dev, yp, rxb);
 785                         }
 786                 }
 787         }
 788 out:
 789         return IRQ_RETVAL(handled);
 790 }
 791
 792 #ifdef CONFIG_PROC_FS
 793
 794 static void *yam_seq_start(struct seq_file *seq, loff_t *pos)
 795 {
 796         return (*pos < NR_PORTS) ? yam_devs[*pos] : NULL;
 797 }
 798
 799 static void *yam_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 800 {
 801         ++*pos;
 802         return (*pos < NR_PORTS) ? yam_devs[*pos] : NULL;
 803 }
 804
 805 static void yam_seq_stop(struct seq_file *seq, void *v)
 806 {
 807 }
 808
 809 static int yam_seq_show(struct seq_file *seq, void *v)
 810 {
 811         struct net_device *dev = v;
 812         const struct yam_port *yp = netdev_priv(dev);
 813
 814         seq_printf(seq, "Device %s\n", dev->name);
 815         seq_printf(seq, "  Up       %d\n", netif_running(dev));
 816         seq_printf(seq, "  Speed    %u\n", yp->bitrate);
 817         seq_printf(seq, "  IoBase   0x%x\n", yp->iobase);
 818         seq_printf(seq, "  BaudRate %u\n", yp->baudrate);
 819         seq_printf(seq, "  IRQ      %u\n", yp->irq);
 820         seq_printf(seq, "  TxState  %u\n", yp->tx_state);
 821         seq_printf(seq, "  Duplex   %u\n", yp->dupmode);
 822         seq_printf(seq, "  HoldDly  %u\n", yp->holdd);
 823         seq_printf(seq, "  TxDelay  %u\n", yp->txd);
 824         seq_printf(seq, "  TxTail   %u\n", yp->txtail);
 825         seq_printf(seq, "  SlotTime %u\n", yp->slot);
 826         seq_printf(seq, "  Persist  %u\n", yp->pers);
 827         seq_printf(seq, "  TxFrames %lu\n", dev->stats.tx_packets);
 828         seq_printf(seq, "  RxFrames %lu\n", dev->stats.rx_packets);
 829         seq_printf(seq, "  TxInt    %u\n", yp->nb_mdint);
 830         seq_printf(seq, "  RxInt    %u\n", yp->nb_rxint);
 831         seq_printf(seq, "  RxOver   %lu\n", dev->stats.rx_fifo_errors);
 832         seq_printf(seq, "\n");
 833         return 0;
 834 }
 835
 836 static const struct seq_operations yam_seqops = {
 837         .start = yam_seq_start,
 838         .next = yam_seq_next,
 839         .stop = yam_seq_stop,
 840         .show = yam_seq_show,
 841 };
 842
 843 static int yam_info_open(struct inode *inode, struct file *file)
 844 {
 845         return seq_open(file, &yam_seqops);
 846 }
 847
 848 static const struct file_operations yam_info_fops = {
 849         .owner = THIS_MODULE,
 850         .open = yam_info_open,
 851         .read = seq_read,
 852         .llseek = seq_lseek,
 853         .release = seq_release,
 854 };
 855
 856 #endif
 857
 858
 859 /* --------------------------------------------------------------------- */
 860
 861 static int yam_open(struct net_device *dev)
 862 {
 863         struct yam_port *yp = netdev_priv(dev);
 864         enum uart u;
 865         int i;
 866         int ret=0;
 867
 868         printk(KERN_INFO "Trying %s at iobase 0x%lx irq %u\n", dev->name, dev->base_addr, dev->irq);
 869
 870         if (!dev || !yp->bitrate)
 871                 return -ENXIO;
 872         if (!dev->base_addr || dev->base_addr > 0x1000 - YAM_EXTENT ||
 873                 dev->irq < 2 || dev->irq > 15) {
 874                 return -ENXIO;
 875         }
 876         if (!request_region(dev->base_addr, YAM_EXTENT, dev->name))
 877         {
 878                 printk(KERN_ERR "%s: cannot 0x%lx busy\n", dev->name, dev->base_addr);
 879                 return -EACCES;
 880         }
 881         if ((u = yam_check_uart(dev->base_addr)) == c_uart_unknown) {
 882                 printk(KERN_ERR "%s: cannot find uart type\n", dev->name);
 883                 ret = -EIO;
 884                 goto out_release_base;
 885         }
 886         if (fpga_download(dev->base_addr, yp->bitrate)) {
 887                 printk(KERN_ERR "%s: cannot init FPGA\n", dev->name);
 888                 ret = -EIO;
 889                 goto out_release_base;
 890         }
 891         outb(0, IER(dev->base_addr));
 892         if (request_irq(dev->irq, yam_interrupt, IRQF_DISABLED | IRQF_SHARED, dev->name, dev)) {
 893                 printk(KERN_ERR "%s: irq %d busy\n", dev->name, dev->irq);
 894                 ret = -EBUSY;
 895                 goto out_release_base;
 896         }
 897
 898         yam_set_uart(dev);
 899
 900         netif_start_queue(dev);
 901
 902         yp->slotcnt = yp->slot / 10;
 903
 904         /* Reset overruns for all ports - FPGA programming makes overruns */
 905         for (i = 0; i < NR_PORTS; i++) {
 906                 struct net_device *yam_dev = yam_devs[i];
 907
 908                 inb(LSR(yam_dev->base_addr));
 909                 yam_dev->stats.rx_fifo_errors = 0;
 910         }
 911
 912         printk(KERN_INFO "%s at iobase 0x%lx irq %u uart %s\n", dev->name, dev->base_addr, dev->irq,
 913                    uart_str[u]);
 914         return 0;
 915
 916 out_release_base:
 917         release_region(dev->base_addr, YAM_EXTENT);
 918         return ret;
 919 }
 920
 921 /* --------------------------------------------------------------------- */
 922
 923 static int yam_close(struct net_device *dev)
 924 {
 925         struct sk_buff *skb;
 926         struct yam_port *yp = netdev_priv(dev);
 927
 928         if (!dev)
 929                 return -EINVAL;
 930
 931         /*
 932          * disable interrupts
 933          */
 934         outb(0, IER(dev->base_addr));
 935         outb(1, MCR(dev->base_addr));
 936         /* Remove IRQ handler if last */
 937         free_irq(dev->irq,dev);
 938         release_region(dev->base_addr, YAM_EXTENT);
 939         netif_stop_queue(dev);
 940         while ((skb = skb_dequeue(&yp->send_queue)))
 941                 dev_kfree_skb(skb);
 942
 943         printk(KERN_INFO "%s: close yam at iobase 0x%lx irq %u\n",
 944                    yam_drvname, dev->base_addr, dev->irq);
 945         return 0;
 946 }
 947
 948 /* --------------------------------------------------------------------- */
 949
 950 static int yam_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 951 {
 952         struct yam_port *yp = netdev_priv(dev);
 953         struct yamdrv_ioctl_cfg yi;
 954         struct yamdrv_ioctl_mcs *ym;
 955         int ioctl_cmd;
 956
 957         if (copy_from_user(&ioctl_cmd, ifr->ifr_data, sizeof(int)))
 958                  return -EFAULT;
 959
 960         if (yp->magic != YAM_MAGIC)
 961                 return -EINVAL;
 962
 963         if (!capable(CAP_NET_ADMIN))
 964                 return -EPERM;
 965
 966         if (cmd != SIOCDEVPRIVATE)
 967                 return -EINVAL;
 968
 969         switch (ioctl_cmd) {
 970
 971         case SIOCYAMRESERVED:
 972                 return -EINVAL;                 /* unused */
 973
 974         case SIOCYAMSMCS:
 975                 if (netif_running(dev))
 976                         return -EINVAL;         /* Cannot change this parameter when up */
 977                 if ((ym = kmalloc(sizeof(struct yamdrv_ioctl_mcs), GFP_KERNEL)) == NULL)
 978                         return -ENOBUFS;
 979                 ym->bitrate = 9600;
 980                 if (copy_from_user(ym, ifr->ifr_data, sizeof(struct yamdrv_ioctl_mcs))) {
 981                         kfree(ym);
 982                         return -EFAULT;
 983                 }
 984                 if (ym->bitrate > YAM_MAXBITRATE) {
 985                         kfree(ym);
 986                         return -EINVAL;
 987                 }
 988                 /* setting predef as 0 for loading userdefined mcs data */
 989                 add_mcs(ym->bits, ym->bitrate, 0);
 990                 kfree(ym);
 991                 break;
 992
 993         case SIOCYAMSCFG:
 994                 if (!capable(CAP_SYS_RAWIO))
 995                         return -EPERM;
 996                 if (copy_from_user(&yi, ifr->ifr_data, sizeof(struct yamdrv_ioctl_cfg)))
 997                          return -EFAULT;
 998
 999                 if ((yi.cfg.mask & YAM_IOBASE) && netif_running(dev))
1000                         return -EINVAL;         /* Cannot change this parameter when up */
1001                 if ((yi.cfg.mask & YAM_IRQ) && netif_running(dev))
1002                         return -EINVAL;         /* Cannot change this parameter when up */
1003                 if ((yi.cfg.mask & YAM_BITRATE) && netif_running(dev))
1004                         return -EINVAL;         /* Cannot change this parameter when up */
1005                 if ((yi.cfg.mask & YAM_BAUDRATE) && netif_running(dev))
1006                         return -EINVAL;         /* Cannot change this parameter when up */
1007
1008                 if (yi.cfg.mask & YAM_IOBASE) {
1009                         yp->iobase = yi.cfg.iobase;
1010                         dev->base_addr = yi.cfg.iobase;
1011                 }
1012                 if (yi.cfg.mask & YAM_IRQ) {
1013                         if (yi.cfg.irq > 15)
1014                                 return -EINVAL;
1015                         yp->irq = yi.cfg.irq;
1016                         dev->irq = yi.cfg.irq;
1017                 }
1018                 if (yi.cfg.mask & YAM_BITRATE) {
1019                         if (yi.cfg.bitrate > YAM_MAXBITRATE)
1020                                 return -EINVAL;
1021                         yp->bitrate = yi.cfg.bitrate;
1022                 }
1023                 if (yi.cfg.mask & YAM_BAUDRATE) {
1024                         if (yi.cfg.baudrate > YAM_MAXBAUDRATE)
1025                                 return -EINVAL;
1026                         yp->baudrate = yi.cfg.baudrate;
1027                 }
1028                 if (yi.cfg.mask & YAM_MODE) {
1029                         if (yi.cfg.mode > YAM_MAXMODE)
1030                                 return -EINVAL;
1031                         yp->dupmode = yi.cfg.mode;
1032                 }
1033                 if (yi.cfg.mask & YAM_HOLDDLY) {
1034                         if (yi.cfg.holddly > YAM_MAXHOLDDLY)
1035                                 return -EINVAL;
1036                         yp->holdd = yi.cfg.holddly;
1037                 }
1038                 if (yi.cfg.mask & YAM_TXDELAY) {
1039                         if (yi.cfg.txdelay > YAM_MAXTXDELAY)
1040                                 return -EINVAL;
1041                         yp->txd = yi.cfg.txdelay;
1042                 }
1043                 if (yi.cfg.mask & YAM_TXTAIL) {
1044                         if (yi.cfg.txtail > YAM_MAXTXTAIL)
1045                                 return -EINVAL;
1046                         yp->txtail = yi.cfg.txtail;
1047                 }
1048                 if (yi.cfg.mask & YAM_PERSIST) {
1049                         if (yi.cfg.persist > YAM_MAXPERSIST)
1050                                 return -EINVAL;
1051                         yp->pers = yi.cfg.persist;
1052                 }
1053                 if (yi.cfg.mask & YAM_SLOTTIME) {
1054                         if (yi.cfg.slottime > YAM_MAXSLOTTIME)
1055                                 return -EINVAL;
1056                         yp->slot = yi.cfg.slottime;
1057                         yp->slotcnt = yp->slot / 10;
1058                 }
1059                 break;
1060
1061         case SIOCYAMGCFG:
1062                 yi.cfg.mask = 0xffffffff;
1063                 yi.cfg.iobase = yp->iobase;
1064                 yi.cfg.irq = yp->irq;
1065                 yi.cfg.bitrate = yp->bitrate;
1066                 yi.cfg.baudrate = yp->baudrate;
1067                 yi.cfg.mode = yp->dupmode;
1068                 yi.cfg.txdelay = yp->txd;
1069                 yi.cfg.holddly = yp->holdd;
1070                 yi.cfg.txtail = yp->txtail;
1071                 yi.cfg.persist = yp->pers;
1072                 yi.cfg.slottime = yp->slot;
1073                 if (copy_to_user(ifr->ifr_data, &yi, sizeof(struct yamdrv_ioctl_cfg)))
1074                          return -EFAULT;
1075                 break;
1076
1077         default:
1078                 return -EINVAL;
1079
1080         }
1081
1082         return 0;
1083 }
1084
1085 /* --------------------------------------------------------------------- */
1086
1087 static int yam_set_mac_address(struct net_device *dev, void *addr)
1088 {
1089         struct sockaddr *sa = (struct sockaddr *) addr;
1090
1091         /* addr is an AX.25 shifted ASCII mac address */
1092         memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
1093         return 0;
1094 }
1095
1096 /* --------------------------------------------------------------------- */
1097
1098 static const struct net_device_ops yam_netdev_ops = {
1099         .ndo_open            = yam_open,
1100         .ndo_stop            = yam_close,
1101         .ndo_start_xmit      = yam_send_packet,
1102         .ndo_do_ioctl        = yam_ioctl,
1103         .ndo_set_mac_address = yam_set_mac_address,
1104 };
1105
1106 static void yam_setup(struct net_device *dev)
1107 {
1108         struct yam_port *yp = netdev_priv(dev);
1109
1110         yp->magic = YAM_MAGIC;
1111         yp->bitrate = DEFAULT_BITRATE;
1112         yp->baudrate = DEFAULT_BITRATE * 2;
1113         yp->iobase = 0;
1114         yp->irq = 0;
1115         yp->dupmode = 0;
1116         yp->holdd = DEFAULT_HOLDD;
1117         yp->txd = DEFAULT_TXD;
1118         yp->txtail = DEFAULT_TXTAIL;
1119         yp->slot = DEFAULT_SLOT;
1120         yp->pers = DEFAULT_PERS;
1121         yp->dev = dev;
1122
1123         dev->base_addr = yp->iobase;
1124         dev->irq = yp->irq;
1125
1126         skb_queue_head_init(&yp->send_queue);
1127
1128         dev->netdev_ops = &yam_netdev_ops;
1129         dev->header_ops = &ax25_header_ops;
1130
1131         dev->type = ARPHRD_AX25;
1132         dev->hard_header_len = AX25_MAX_HEADER_LEN;
1133         dev->mtu = AX25_MTU;
1134         dev->addr_len = AX25_ADDR_LEN;
1135         memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN);
1136         memcpy(dev->dev_addr, &ax25_defaddr, AX25_ADDR_LEN);
1137 }
1138
1139 static int __init yam_init_driver(void)
1140 {
1141         struct net_device *dev;
1142         int i, err;
1143         char name[IFNAMSIZ];
1144
1145         printk(yam_drvinfo);
1146
1147         for (i = 0; i < NR_PORTS; i++) {
1148                 sprintf(name, "yam%d", i);
1149
1150                 dev = alloc_netdev(sizeof(struct yam_port), name,
1151                                    yam_setup);
1152                 if (!dev) {
1153                         printk(KERN_ERR "yam: cannot allocate net device %s\n",
1154                                dev->name);
1155                         err = -ENOMEM;
1156                         goto error;
1157                 }
1158
1159                 err = register_netdev(dev);
1160                 if (err) {
1161                         printk(KERN_WARNING "yam: cannot register net device %s\n", dev->name);
1162                         goto error;
1163                 }
1164                 yam_devs[i] = dev;
1165
1166         }
1167
1168         yam_timer.function = yam_dotimer;
1169         yam_timer.expires = jiffies + HZ / 100;
1170         add_timer(&yam_timer);
1171
1172         proc_net_fops_create(&init_net, "yam", S_IRUGO, &yam_info_fops);
1173         return 0;
1174  error:
1175         while (--i >= 0) {
1176                 unregister_netdev(yam_devs[i]);
1177                 free_netdev(yam_devs[i]);
1178         }
1179         return err;
1180 }
1181
1182 /* --------------------------------------------------------------------- */
1183
1184 static void __exit yam_cleanup_driver(void)
1185 {
1186         struct yam_mcs *p;
1187         int i;
1188
1189         del_timer(&yam_timer);
1190         for (i = 0; i < NR_PORTS; i++) {
1191                 struct net_device *dev = yam_devs[i];
1192                 if (dev) {
1193                         unregister_netdev(dev);
1194                         free_netdev(dev);
1195                 }
1196         }
1197
1198         while (yam_data) {
1199                 p = yam_data;
1200                 yam_data = yam_data->next;
1201                 kfree(p);
1202         }
1203
1204         proc_net_remove(&init_net, "yam");
1205 }
1206
1207 /* --------------------------------------------------------------------- */
1208
1209 MODULE_AUTHOR("Frederic Rible F1OAT frible@teaser.fr");
1210 MODULE_DESCRIPTION("Yam amateur radio modem driver");
1211 MODULE_LICENSE("GPL");
1212 MODULE_FIRMWARE(FIRMWARE_1200);
1213 MODULE_FIRMWARE(FIRMWARE_9600);
1214
1215 module_init(yam_init_driver);
1216 module_exit(yam_cleanup_driver);
1217
1218 /* --------------------------------------------------------------------- */
1219