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