drivers/net/wan/cycx_drv.c

   1 /*
   2 * cycx_drv.c    Cyclom 2X Support Module.
   3 *
   4 *               This module is a library of common hardware specific
   5 *               functions used by the Cyclades Cyclom 2X sync card.
   6 *
   7 * Author:       Arnaldo Carvalho de Melo <acme@conectiva.com.br>
   8 *
   9 * Copyright:    (c) 1998-2003 Arnaldo Carvalho de Melo
  10 *
  11 * Based on sdladrv.c by Gene Kozin <genek@compuserve.com>
  12 *
  13 *               This program is free software; you can redistribute it and/or
  14 *               modify it under the terms of the GNU General Public License
  15 *               as published by the Free Software Foundation; either version
  16 *               2 of the License, or (at your option) any later version.
  17 * ============================================================================
  18 * 1999/11/11    acme            set_current_state(TASK_INTERRUPTIBLE), code
  19 *                               cleanup
  20 * 1999/11/08    acme            init_cyc2x deleted, doing nothing
  21 * 1999/11/06    acme            back to read[bw], write[bw] and memcpy_to and
  22 *                               fromio to use dpmbase ioremaped
  23 * 1999/10/26    acme            use isa_read[bw], isa_write[bw] & isa_memcpy_to
  24 *                               & fromio
  25 * 1999/10/23    acme            cleanup to only supports cyclom2x: all the other
  26 *                               boards are no longer manufactured by cyclades,
  27 *                               if someone wants to support them... be my guest!
  28 * 1999/05/28    acme            cycx_intack & cycx_intde gone for good
  29 * 1999/05/18    acme            lots of unlogged work, submitting to Linus...
  30 * 1999/01/03    acme            more judicious use of data types
  31 * 1999/01/03    acme            judicious use of data types :>
  32 *                               cycx_inten trying to reset pending interrupts
  33 *                               from cyclom 2x - I think this isn't the way to
  34 *                               go, but for now...
  35 * 1999/01/02    acme            cycx_intack ok, I think there's nothing to do
  36 *                               to ack an int in cycx_drv.c, only handle it in
  37 *                               cyx_isr (or in the other protocols: cyp_isr,
  38 *                               cyf_isr, when they get implemented.
  39 * Dec 31, 1998  acme            cycx_data_boot & cycx_code_boot fixed, crossing
  40 *                               fingers to see x25_configure in cycx_x25.c
  41 *                               work... :)
  42 * Dec 26, 1998  acme            load implementation fixed, seems to work! :)
  43 *                               cycx_2x_dpmbase_options with all the possible
  44 *                               DPM addresses (20).
  45 *                               cycx_intr implemented (test this!)
  46 *                               general code cleanup
  47 * Dec  8, 1998  Ivan Passos     Cyclom-2X firmware load implementation.
  48 * Aug  8, 1998  acme            Initial version.
  49 */
  50
  51 #include <linux/init.h>         /* __init */
  52 #include <linux/module.h>
  53 #include <linux/kernel.h>       /* printk(), and other useful stuff */
  54 #include <linux/stddef.h>       /* offsetof(), etc. */
  55 #include <linux/errno.h>        /* return codes */
  56 #include <linux/sched.h>        /* for jiffies, HZ, etc. */
  57 #include <linux/cycx_drv.h>     /* API definitions */
  58 #include <linux/cycx_cfm.h>     /* CYCX firmware module definitions */
  59 #include <linux/delay.h>        /* udelay, msleep_interruptible */
  60 #include <asm/io.h>             /* read[wl], write[wl], ioremap, iounmap */
  61
  62 #define MOD_VERSION     0
  63 #define MOD_RELEASE     6
  64
  65 MODULE_AUTHOR("Arnaldo Carvalho de Melo");
  66 MODULE_DESCRIPTION("Cyclom 2x Sync Card Driver");
  67 MODULE_LICENSE("GPL");
  68
  69 /* Hardware-specific functions */
  70 static int load_cyc2x(struct cycx_hw *hw, struct cycx_firmware *cfm, u32 len);
  71 static void cycx_bootcfg(struct cycx_hw *hw);
  72
  73 static int reset_cyc2x(void __iomem *addr);
  74 static int detect_cyc2x(void __iomem *addr);
  75
  76 /* Miscellaneous functions */
  77 static int get_option_index(long *optlist, long optval);
  78 static u16 checksum(u8 *buf, u32 len);
  79
  80 #define wait_cyc(addr) cycx_exec(addr + CMD_OFFSET)
  81
  82 /* Global Data */
  83
  84 /* private data */
  85 static char modname[] = "cycx_drv";
  86 static char fullname[] = "Cyclom 2X Support Module";
  87 static char copyright[] = "(c) 1998-2003 Arnaldo Carvalho de Melo "
  88                           "<acme@conectiva.com.br>";
  89
  90 /* Hardware configuration options.
  91  * These are arrays of configuration options used by verification routines.
  92  * The first element of each array is its size (i.e. number of options).
  93  */
  94 static long cyc2x_dpmbase_options[] = {
  95         20,
  96         0xA0000, 0xA4000, 0xA8000, 0xAC000, 0xB0000, 0xB4000, 0xB8000,
  97         0xBC000, 0xC0000, 0xC4000, 0xC8000, 0xCC000, 0xD0000, 0xD4000,
  98         0xD8000, 0xDC000, 0xE0000, 0xE4000, 0xE8000, 0xEC000
  99 };
 100
 101 static long cycx_2x_irq_options[]  = { 7, 3, 5, 9, 10, 11, 12, 15 };
 102
 103 /* Kernel Loadable Module Entry Points */
 104 /* Module 'insert' entry point.
 105  * o print announcement
 106  * o initialize static data
 107  *
 108  * Return:      0       Ok
 109  *              < 0     error.
 110  * Context:     process */
 111
 112 static int __init cycx_drv_init(void)
 113 {
 114         printk(KERN_INFO "%s v%u.%u %s\n", fullname, MOD_VERSION, MOD_RELEASE,
 115                          copyright);
 116
 117         return 0;
 118 }
 119
 120 /* Module 'remove' entry point.
 121  * o release all remaining system resources */
 122 static void cycx_drv_cleanup(void)
 123 {
 124 }
 125
 126 /* Kernel APIs */
 127 /* Set up adapter.
 128  * o detect adapter type
 129  * o verify hardware configuration options
 130  * o check for hardware conflicts
 131  * o set up adapter shared memory
 132  * o test adapter memory
 133  * o load firmware
 134  * Return:      0       ok.
 135  *              < 0     error */
 136 EXPORT_SYMBOL(cycx_setup);
 137 int cycx_setup(struct cycx_hw *hw, void *cfm, u32 len, unsigned long dpmbase)
 138 {
 139         int err;
 140
 141         /* Verify IRQ configuration options */
 142         if (!get_option_index(cycx_2x_irq_options, hw->irq)) {
 143                 printk(KERN_ERR "%s: IRQ %d is invalid!\n", modname, hw->irq);
 144                 return -EINVAL;
 145         }
 146
 147         /* Setup adapter dual-port memory window and test memory */
 148         if (!dpmbase) {
 149                 printk(KERN_ERR "%s: you must specify the dpm address!\n",
 150                                 modname);
 151                 return -EINVAL;
 152         } else if (!get_option_index(cyc2x_dpmbase_options, dpmbase)) {
 153                 printk(KERN_ERR "%s: memory address 0x%lX is invalid!\n",
 154                                 modname, dpmbase);
 155                 return -EINVAL;
 156         }
 157
 158         hw->dpmbase = ioremap(dpmbase, CYCX_WINDOWSIZE);
 159         hw->dpmsize = CYCX_WINDOWSIZE;
 160
 161         if (!detect_cyc2x(hw->dpmbase)) {
 162                 printk(KERN_ERR "%s: adapter Cyclom 2X not found at "
 163                                 "address 0x%lX!\n", modname, dpmbase);
 164                 return -EINVAL;
 165         }
 166
 167         printk(KERN_INFO "%s: found Cyclom 2X card at address 0x%lX.\n",
 168                          modname, dpmbase);
 169
 170         /* Load firmware. If loader fails then shut down adapter */
 171         err = load_cyc2x(hw, cfm, len);
 172
 173         if (err)
 174                 cycx_down(hw);         /* shutdown adapter */
 175
 176         return err;
 177 }
 178
 179 EXPORT_SYMBOL(cycx_down);
 180 int cycx_down(struct cycx_hw *hw)
 181 {
 182         iounmap(hw->dpmbase);
 183         return 0;
 184 }
 185
 186 /* Enable interrupt generation.  */
 187 static void cycx_inten(struct cycx_hw *hw)
 188 {
 189         writeb(0, hw->dpmbase);
 190 }
 191
 192 /* Generate an interrupt to adapter's CPU. */
 193 EXPORT_SYMBOL(cycx_intr);
 194 void cycx_intr(struct cycx_hw *hw)
 195 {
 196         writew(0, hw->dpmbase + GEN_CYCX_INTR);
 197 }
 198
 199 /* Execute Adapter Command.
 200  * o Set exec flag.
 201  * o Busy-wait until flag is reset. */
 202 EXPORT_SYMBOL(cycx_exec);
 203 int cycx_exec(void __iomem *addr)
 204 {
 205         u16 i = 0;
 206         /* wait till addr content is zeroed */
 207
 208         while (readw(addr)) {
 209                 udelay(1000);
 210
 211                 if (++i > 50)
 212                         return -1;
 213         }
 214
 215         return 0;
 216 }
 217
 218 /* Read absolute adapter memory.
 219  * Transfer data from adapter's memory to data buffer. */
 220 EXPORT_SYMBOL(cycx_peek);
 221 int cycx_peek(struct cycx_hw *hw, u32 addr, void *buf, u32 len)
 222 {
 223         if (len == 1)
 224                 *(u8*)buf = readb(hw->dpmbase + addr);
 225         else
 226                 memcpy_fromio(buf, hw->dpmbase + addr, len);
 227
 228         return 0;
 229 }
 230
 231 /* Write Absolute Adapter Memory.
 232  * Transfer data from data buffer to adapter's memory. */
 233 EXPORT_SYMBOL(cycx_poke);
 234 int cycx_poke(struct cycx_hw *hw, u32 addr, void *buf, u32 len)
 235 {
 236         if (len == 1)
 237                 writeb(*(u8*)buf, hw->dpmbase + addr);
 238         else
 239                 memcpy_toio(hw->dpmbase + addr, buf, len);
 240
 241         return 0;
 242 }
 243
 244 /* Hardware-Specific Functions */
 245
 246 /* Load Aux Routines */
 247 /* Reset board hardware.
 248    return 1 if memory exists at addr and 0 if not. */
 249 static int memory_exists(void __iomem *addr)
 250 {
 251         int tries = 0;
 252
 253         for (; tries < 3 ; tries++) {
 254                 writew(TEST_PATTERN, addr + 0x10);
 255
 256                 if (readw(addr + 0x10) == TEST_PATTERN)
 257                         if (readw(addr + 0x10) == TEST_PATTERN)
 258                                 return 1;
 259
 260                 msleep_interruptible(1 * 1000);
 261         }
 262
 263         return 0;
 264 }
 265
 266 /* Load reset code. */
 267 static void reset_load(void __iomem *addr, u8 *buffer, u32 cnt)
 268 {
 269         void __iomem *pt_code = addr + RESET_OFFSET;
 270         u16 i; /*, j; */
 271
 272         for (i = 0 ; i < cnt ; i++) {
 273 /*              for (j = 0 ; j < 50 ; j++); Delay - FIXME busy waiting... */
 274                 writeb(*buffer++, pt_code++);
 275         }
 276 }
 277
 278 /* Load buffer using boot interface.
 279  * o copy data from buffer to Cyclom-X memory
 280  * o wait for reset code to copy it to right portion of memory */
 281 static int buffer_load(void __iomem *addr, u8 *buffer, u32 cnt)
 282 {
 283         memcpy_toio(addr + DATA_OFFSET, buffer, cnt);
 284         writew(GEN_BOOT_DAT, addr + CMD_OFFSET);
 285
 286         return wait_cyc(addr);
 287 }
 288
 289 /* Set up entry point and kick start Cyclom-X CPU. */
 290 static void cycx_start(void __iomem *addr)
 291 {
 292         /* put in 0x30 offset the jump instruction to the code entry point */
 293         writeb(0xea, addr + 0x30);
 294         writeb(0x00, addr + 0x31);
 295         writeb(0xc4, addr + 0x32);
 296         writeb(0x00, addr + 0x33);
 297         writeb(0x00, addr + 0x34);
 298
 299         /* cmd to start executing code */
 300         writew(GEN_START, addr + CMD_OFFSET);
 301 }
 302
 303 /* Load and boot reset code. */
 304 static void cycx_reset_boot(void __iomem *addr, u8 *code, u32 len)
 305 {
 306         void __iomem *pt_start = addr + START_OFFSET;
 307
 308         writeb(0xea, pt_start++); /* jmp to f000:3f00 */
 309         writeb(0x00, pt_start++);
 310         writeb(0xfc, pt_start++);
 311         writeb(0x00, pt_start++);
 312         writeb(0xf0, pt_start);
 313         reset_load(addr, code, len);
 314
 315         /* 80186 was in hold, go */
 316         writeb(0, addr + START_CPU);
 317         msleep_interruptible(1 * 1000);
 318 }
 319
 320 /* Load data.bin file through boot (reset) interface. */
 321 static int cycx_data_boot(void __iomem *addr, u8 *code, u32 len)
 322 {
 323         void __iomem *pt_boot_cmd = addr + CMD_OFFSET;
 324         u32 i;
 325
 326         /* boot buffer lenght */
 327         writew(CFM_LOAD_BUFSZ, pt_boot_cmd + sizeof(u16));
 328         writew(GEN_DEFPAR, pt_boot_cmd);
 329
 330         if (wait_cyc(addr) < 0)
 331                 return -1;
 332
 333         writew(0, pt_boot_cmd + sizeof(u16));
 334         writew(0x4000, pt_boot_cmd + 2 * sizeof(u16));
 335         writew(GEN_SET_SEG, pt_boot_cmd);
 336
 337         if (wait_cyc(addr) < 0)
 338                 return -1;
 339
 340         for (i = 0 ; i < len ; i += CFM_LOAD_BUFSZ)
 341                 if (buffer_load(addr, code + i,
 342                                 min_t(u32, CFM_LOAD_BUFSZ, (len - i))) < 0) {
 343                         printk(KERN_ERR "%s: Error !!\n", modname);
 344                         return -1;
 345                 }
 346
 347         return 0;
 348 }
 349
 350
 351 /* Load code.bin file through boot (reset) interface. */
 352 static int cycx_code_boot(void __iomem *addr, u8 *code, u32 len)
 353 {
 354         void __iomem *pt_boot_cmd = addr + CMD_OFFSET;
 355         u32 i;
 356
 357         /* boot buffer lenght */
 358         writew(CFM_LOAD_BUFSZ, pt_boot_cmd + sizeof(u16));
 359         writew(GEN_DEFPAR, pt_boot_cmd);
 360
 361         if (wait_cyc(addr) < 0)
 362                 return -1;
 363
 364         writew(0x0000, pt_boot_cmd + sizeof(u16));
 365         writew(0xc400, pt_boot_cmd + 2 * sizeof(u16));
 366         writew(GEN_SET_SEG, pt_boot_cmd);
 367
 368         if (wait_cyc(addr) < 0)
 369                 return -1;
 370
 371         for (i = 0 ; i < len ; i += CFM_LOAD_BUFSZ)
 372                 if (buffer_load(addr, code + i,
 373                                 min_t(u32, CFM_LOAD_BUFSZ, (len - i)))) {
 374                         printk(KERN_ERR "%s: Error !!\n", modname);
 375                         return -1;
 376                 }
 377
 378         return 0;
 379 }
 380
 381 /* Load adapter from the memory image of the CYCX firmware module.
 382  * o verify firmware integrity and compatibility
 383  * o start adapter up */
 384 static int load_cyc2x(struct cycx_hw *hw, struct cycx_firmware *cfm, u32 len)
 385 {
 386         int i, j;
 387         struct cycx_fw_header *img_hdr;
 388         u8 *reset_image,
 389            *data_image,
 390            *code_image;
 391         void __iomem *pt_cycld = hw->dpmbase + 0x400;
 392         u16 cksum;
 393
 394         /* Announce */
 395         printk(KERN_INFO "%s: firmware signature=\"%s\"\n", modname,
 396                                                             cfm->signature);
 397
 398         /* Verify firmware signature */
 399         if (strcmp(cfm->signature, CFM_SIGNATURE)) {
 400                 printk(KERN_ERR "%s:load_cyc2x: not Cyclom-2X firmware!\n",
 401                                 modname);
 402                 return -EINVAL;
 403         }
 404
 405         printk(KERN_INFO "%s: firmware version=%u\n", modname, cfm->version);
 406
 407         /* Verify firmware module format version */
 408         if (cfm->version != CFM_VERSION) {
 409                 printk(KERN_ERR "%s:%s: firmware format %u rejected! "
 410                                 "Expecting %u.\n",
 411                                 modname, __FUNCTION__, cfm->version, CFM_VERSION);
 412                 return -EINVAL;
 413         }
 414
 415         /* Verify firmware module length and checksum */
 416         cksum = checksum((u8*)&cfm->info, sizeof(struct cycx_fw_info) +
 417                                           cfm->info.codesize);
 418 /*
 419         FIXME cfm->info.codesize is off by 2
 420         if (((len - sizeof(struct cycx_firmware) - 1) != cfm->info.codesize) ||
 421 */
 422         if (cksum != cfm->checksum) {
 423                 printk(KERN_ERR "%s:%s: firmware corrupted!\n",
 424                                 modname, __FUNCTION__);
 425                 printk(KERN_ERR " cdsize = 0x%x (expected 0x%lx)\n",
 426                                 len - (int)sizeof(struct cycx_firmware) - 1,
 427                                 cfm->info.codesize);
 428                 printk(KERN_ERR " chksum = 0x%x (expected 0x%x)\n",
 429                                 cksum, cfm->checksum);
 430                 return -EINVAL;
 431         }
 432
 433         /* If everything is ok, set reset, data and code pointers */
 434         img_hdr = (struct cycx_fw_header *)&cfm->image;
 435 #ifdef FIRMWARE_DEBUG
 436         printk(KERN_INFO "%s:%s: image sizes\n", __FUNCTION__, modname);
 437         printk(KERN_INFO " reset=%lu\n", img_hdr->reset_size);
 438         printk(KERN_INFO "  data=%lu\n", img_hdr->data_size);
 439         printk(KERN_INFO "  code=%lu\n", img_hdr->code_size);
 440 #endif
 441         reset_image = ((u8 *)img_hdr) + sizeof(struct cycx_fw_header);
 442         data_image = reset_image + img_hdr->reset_size;
 443         code_image = data_image + img_hdr->data_size;
 444
 445         /*---- Start load ----*/
 446         /* Announce */
 447         printk(KERN_INFO "%s: loading firmware %s (ID=%u)...\n", modname,
 448                          cfm->descr[0] ? cfm->descr : "unknown firmware",
 449                          cfm->info.codeid);
 450
 451         for (i = 0 ; i < 5 ; i++) {
 452                 /* Reset Cyclom hardware */
 453                 if (!reset_cyc2x(hw->dpmbase)) {
 454                         printk(KERN_ERR "%s: dpm problem or board not found\n",
 455                                         modname);
 456                         return -EINVAL;
 457                 }
 458
 459                 /* Load reset.bin */
 460                 cycx_reset_boot(hw->dpmbase, reset_image, img_hdr->reset_size);
 461                 /* reset is waiting for boot */
 462                 writew(GEN_POWER_ON, pt_cycld);
 463                 msleep_interruptible(1 * 1000);
 464
 465                 for (j = 0 ; j < 3 ; j++)
 466                         if (!readw(pt_cycld))
 467                                 goto reset_loaded;
 468                         else
 469                                 msleep_interruptible(1 * 1000);
 470         }
 471
 472         printk(KERN_ERR "%s: reset not started.\n", modname);
 473         return -EINVAL;
 474
 475 reset_loaded:
 476         /* Load data.bin */
 477         if (cycx_data_boot(hw->dpmbase, data_image, img_hdr->data_size)) {
 478                 printk(KERN_ERR "%s: cannot load data file.\n", modname);
 479                 return -EINVAL;
 480         }
 481
 482         /* Load code.bin */
 483         if (cycx_code_boot(hw->dpmbase, code_image, img_hdr->code_size)) {
 484                 printk(KERN_ERR "%s: cannot load code file.\n", modname);
 485                 return -EINVAL;
 486         }
 487
 488         /* Prepare boot-time configuration data */
 489         cycx_bootcfg(hw);
 490
 491         /* kick-off CPU */
 492         cycx_start(hw->dpmbase);
 493
 494         /* Arthur Ganzert's tip: wait a while after the firmware loading...
 495            seg abr 26 17:17:12 EST 1999 - acme */
 496         msleep_interruptible(7 * 1000);
 497         printk(KERN_INFO "%s: firmware loaded!\n", modname);
 498
 499         /* enable interrupts */
 500         cycx_inten(hw);
 501
 502         return 0;
 503 }
 504
 505 /* Prepare boot-time firmware configuration data.
 506  * o initialize configuration data area
 507    From async.doc - V_3.4.0 - 07/18/1994
 508    - As of now, only static buffers are available to the user.
 509      So, the bit VD_RXDIRC must be set in 'valid'. That means that user
 510      wants to use the static transmission and reception buffers. */
 511 static void cycx_bootcfg(struct cycx_hw *hw)
 512 {
 513         /* use fixed buffers */
 514         writeb(FIXED_BUFFERS, hw->dpmbase + CONF_OFFSET);
 515 }
 516
 517 /* Detect Cyclom 2x adapter.
 518  *      Following tests are used to detect Cyclom 2x adapter:
 519  *       to be completed based on the tests done below
 520  *      Return 1 if detected o.k. or 0 if failed.
 521  *      Note:   This test is destructive! Adapter will be left in shutdown
 522  *              state after the test. */
 523 static int detect_cyc2x(void __iomem *addr)
 524 {
 525         reset_cyc2x(addr);
 526
 527         return memory_exists(addr);
 528 }
 529
 530 /* Miscellaneous */
 531 /* Get option's index into the options list.
 532  *      Return option's index (1 .. N) or zero if option is invalid. */
 533 static int get_option_index(long *optlist, long optval)
 534 {
 535         int i = 1;
 536
 537         for (; i <= optlist[0]; ++i)
 538                 if (optlist[i] == optval)
 539                         return i;
 540
 541         return 0;
 542 }
 543
 544 /* Reset adapter's CPU. */
 545 static int reset_cyc2x(void __iomem *addr)
 546 {
 547         writeb(0, addr + RST_ENABLE);
 548         msleep_interruptible(2 * 1000);
 549         writeb(0, addr + RST_DISABLE);
 550         msleep_interruptible(2 * 1000);
 551
 552         return memory_exists(addr);
 553 }
 554
 555 /* Calculate 16-bit CRC using CCITT polynomial. */
 556 static u16 checksum(u8 *buf, u32 len)
 557 {
 558         u16 crc = 0;
 559         u16 mask, flag;
 560
 561         for (; len; --len, ++buf)
 562                 for (mask = 0x80; mask; mask >>= 1) {
 563                         flag = (crc & 0x8000);
 564                         crc <<= 1;
 565                         crc |= ((*buf & mask) ? 1 : 0);
 566
 567                         if (flag)
 568                                 crc ^= 0x1021;
 569                 }
 570
 571         return crc;
 572 }
 573
 574 module_init(cycx_drv_init);
 575 module_exit(cycx_drv_cleanup);
 576
 577 /* End */