target/linux/package/switch/src/switch-adm.c

   1 /*
   2  * ADMTEK Adm6996 switch configuration module
   3  *
   4  * Copyright (C) 2005 Felix Fietkau <nbd@nbd.name>
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19  * 02110-1301, USA.
  20  */
  21
  22 #include <linux/config.h>
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/if.h>
  26 #include <linux/if_arp.h>
  27 #include <linux/sockios.h>
  28 #include <linux/delay.h>
  29 #include <asm/uaccess.h>
  30
  31 #include "switch-core.h"
  32 #include "gpio.h"
  33
  34 #define DRIVER_NAME "adm6996"
  35 #define DRIVER_VERSION "0.01"
  36
  37 static int eecs = 0;
  38 static int eesk = 0;
  39 static int eedi = 0;
  40 static int eerc = 0;
  41 static int force = 0;
  42
  43 MODULE_AUTHOR("Felix Fietkau <openwrt@nbd.name>");
  44 MODULE_LICENSE("GPL");
  45 MODULE_PARM(eecs, "i");
  46 MODULE_PARM(eesk, "i");
  47 MODULE_PARM(eedi, "i");
  48 MODULE_PARM(eerc, "i");
  49 MODULE_PARM(force, "i");
  50
  51 /* Minimum timing constants */
  52 #define EECK_EDGE_TIME  3   /* 3us - max(adm 2.5us, 93c 1us) */
  53 #define EEDI_SETUP_TIME 1   /* 1us - max(adm 10ns, 93c 400ns) */
  54 #define EECS_SETUP_TIME 1   /* 1us - max(adm no, 93c 200ns) */
  55
  56 /* Handy macros for writing fixed length values */
  57 #define adm_write8(cs, b) { __u8 val = (__u8) (b); adm_write(cs, &val, sizeof(val)*8); }
  58 #define adm_write16(cs, w) { __u16 val = hton16(w); adm_write(cs, (__u8 *)&val, sizeof(val)*8); }
  59 #define adm_write32(cs, i) { uint32 val = hton32(i); adm_write(cs, (__u8 *)&val, sizeof(val)*8); }
  60
  61 #define atoi(str) simple_strtoul(((str != NULL) ? str : ""), NULL, 0)
  62
  63 #if defined(BCMGPIO2) || defined(BCMGPIO)
  64 extern char *nvram_get(char *name);
  65
  66 /* Return gpio pin number assigned to the named pin */
  67 /*
  68 * Variable should be in format:
  69 *
  70 *       gpio<N>=pin_name
  71 *
  72 * 'def_pin' is returned if there is no such variable found.
  73 */
  74 static unsigned int getgpiopin(char *pin_name, unsigned int def_pin)
  75 {
  76         char name[] = "gpioXXXX";
  77         char *val;
  78         unsigned int pin;
  79
  80         /* Go thru all possibilities till a match in pin name */
  81         for (pin = 0; pin < 16; pin ++) {
  82                 sprintf(name, "gpio%d", pin);
  83                 val = nvram_get(name);
  84                 if (val && !strcmp(val, pin_name))
  85                         return pin;
  86         }
  87         return def_pin;
  88 }
  89 #endif
  90
  91
  92 static void adm_write(int cs, char *buf, unsigned int bits)
  93 {
  94         int i, len = (bits + 7) / 8;
  95         __u8 mask;
  96
  97         gpioout(eecs, (cs ? eecs : 0));
  98         udelay(EECK_EDGE_TIME);
  99
 100         /* Byte assemble from MSB to LSB */
 101         for (i = 0; i < len; i++) {
 102                 /* Bit bang from MSB to LSB */
 103                 for (mask = 0x80; mask && bits > 0; mask >>= 1, bits --) {
 104                         /* Clock low */
 105                         gpioout(eesk, 0);
 106                         udelay(EECK_EDGE_TIME);
 107
 108                         /* Output on rising edge */
 109                         gpioout(eedi, ((mask & buf[i]) ? eedi : 0));
 110                         udelay(EEDI_SETUP_TIME);
 111
 112                         /* Clock high */
 113                         gpioout(eesk, eesk);
 114                         udelay(EECK_EDGE_TIME);
 115                 }
 116         }
 117
 118         /* Clock low */
 119         gpioout(eesk, 0);
 120         udelay(EECK_EDGE_TIME);
 121
 122         if (cs)
 123                 gpioout(eecs, 0);
 124 }
 125
 126
 127 static void adm_read(int cs, char *buf, unsigned int bits)
 128 {
 129         int i, len = (bits + 7) / 8;
 130         __u8 mask;
 131
 132         gpioout(eecs, (cs ? eecs : 0));
 133         udelay(EECK_EDGE_TIME);
 134
 135         /* Byte assemble from MSB to LSB */
 136         for (i = 0; i < len; i++) {
 137                 __u8 byte;
 138
 139                 /* Bit bang from MSB to LSB */
 140                 for (mask = 0x80, byte = 0; mask && bits > 0; mask >>= 1, bits --) {
 141                         __u8 gp;
 142
 143                         /* Clock low */
 144                         gpioout(eesk, 0);
 145                         udelay(EECK_EDGE_TIME);
 146
 147                         /* Input on rising edge */
 148                         gp = gpioin();
 149                         if (gp & eedi)
 150                                 byte |= mask;
 151
 152                         /* Clock high */
 153                         gpioout(eesk, eesk);
 154                         udelay(EECK_EDGE_TIME);
 155                 }
 156
 157                 *buf++ = byte;
 158         }
 159
 160         /* Clock low */
 161         gpioout(eesk, 0);
 162         udelay(EECK_EDGE_TIME);
 163
 164         if (cs)
 165                 gpioout(eecs, 0);
 166 }
 167
 168
 169 /* Enable outputs with specified value to the chip */
 170 static void adm_enout(__u8 pins, __u8 val)
 171 {
 172         /* Prepare GPIO output value */
 173         gpioout(pins, val);
 174
 175         /* Enable GPIO outputs */
 176         gpioouten(pins, pins);
 177         udelay(EECK_EDGE_TIME);
 178 }
 179
 180
 181 /* Disable outputs to the chip */
 182 static void adm_disout(__u8 pins)
 183 {
 184         /* Disable GPIO outputs */
 185         gpioouten(pins, 0);
 186         udelay(EECK_EDGE_TIME);
 187 }
 188
 189
 190 /* Advance clock(s) */
 191 static void adm_adclk(int clocks)
 192 {
 193         int i;
 194         for (i = 0; i < clocks; i++) {
 195                 /* Clock high */
 196                 gpioout(eesk, eesk);
 197                 udelay(EECK_EDGE_TIME);
 198
 199                 /* Clock low */
 200                 gpioout(eesk, 0);
 201                 udelay(EECK_EDGE_TIME);
 202         }
 203 }
 204
 205 static __u32 adm_rreg(__u8 table, __u8 addr)
 206 {
 207         /* cmd: 01 10 T DD R RRRRRR */
 208         __u8 bits[6] = {
 209                 0xFF, 0xFF, 0xFF, 0xFF,
 210                 (0x06 << 4) | ((table & 0x01) << 3 | (addr&64)>>6),
 211                 ((addr&62)<<2)
 212         };
 213
 214         __u8 rbits[4];
 215
 216         /* Enable GPIO outputs with all pins to 0 */
 217         adm_enout((__u8)(eecs | eesk | eedi), 0);
 218
 219         adm_write(0, bits, 46);
 220         adm_disout((__u8)(eedi));
 221         adm_adclk(2);
 222         adm_read (0, rbits, 32);
 223
 224         /* Extra clock(s) required per datasheet */
 225         adm_adclk(2);
 226
 227         /* Disable GPIO outputs */
 228         adm_disout((__u8)(eecs | eesk));
 229
 230         if (!table) /* EEPROM has 16-bit registers, but pumps out two registers in one request */
 231                 return (addr & 0x01 ?  (rbits[0]<<8) | rbits[1] : (rbits[2]<<8) | (rbits[3]));
 232         else
 233                 return (rbits[0]<<24) | (rbits[1]<<16) | (rbits[2]<<8) | rbits[3];
 234 }
 235
 236
 237
 238 /* Write chip configuration register */
 239 /* Follow 93c66 timing and chip's min EEPROM timing requirement */
 240 void
 241 adm_wreg(__u8 addr, __u16 val)
 242 {
 243         /* cmd(27bits): sb(1) + opc(01) + addr(bbbbbbbb) + data(bbbbbbbbbbbbbbbb) */
 244         __u8 bits[4] = {
 245                 (0x05 << 5) | (addr >> 3),
 246                 (addr << 5) | (__u8)(val >> 11),
 247                 (__u8)(val >> 3),
 248                 (__u8)(val << 5)
 249         };
 250
 251         /* Enable GPIO outputs with all pins to 0 */
 252         adm_enout((__u8)(eecs | eesk | eedi), 0);
 253
 254         /* Write cmd. Total 27 bits */
 255         adm_write(1, bits, 27);
 256
 257         /* Extra clock(s) required per datasheet */
 258         adm_adclk(2);
 259
 260         /* Disable GPIO outputs */
 261         adm_disout((__u8)(eecs | eesk | eedi));
 262 }
 263
 264
 265 /* Port configuration registers */
 266 static int port_conf[] = { 0x01, 0x03, 0x05, 0x07, 0x08, 0x09 };
 267
 268 /* Bits in VLAN port mapping */
 269 static int vlan_ports[] = { 1 << 0, 1 << 2, 1 << 4, 1 << 6, 1 << 7, 1 << 8 };
 270
 271 static int handle_vlan_port_read(void *driver, char *buf, int nr)
 272 {
 273         int ports, i, c, len = 0;
 274
 275         if ((nr < 0) || (nr > 15))
 276                 return 0;
 277
 278         /* Get VLAN port map */
 279         ports = adm_rreg(0, 0x13 + nr);
 280
 281         for (i = 0; i <= 5; i++) {
 282                 if (ports & vlan_ports[i]) {
 283                         c = adm_rreg(0, port_conf[i]);
 284
 285                         len += sprintf(buf + len, "%d", i);
 286                         if (c & (1 << 4)) {
 287                                 buf[len++] = 't';
 288                                 if (((c & (0xf << 10)) >> 10) == nr)
 289                                         buf[len++] = '*';
 290                         } else if (i == 5)
 291                                 buf[len++] = 'u';
 292
 293                         buf[len++] = '\t';
 294                 }
 295         }
 296         len += sprintf(buf + len, "\n");
 297
 298         return len;
 299 }
 300
 301 static int handle_vlan_port_write(void *driver, char *buf, int nr)
 302 {
 303         int i, cfg, ports;
 304         switch_driver *d = (switch_driver *) driver;
 305         switch_vlan_config *c = switch_parse_vlan(d, buf);
 306
 307         if (c == NULL)
 308                 return -1;
 309
 310         ports = adm_rreg(0, 0x13 + nr);
 311         for (i = 0; i < d->ports; i++) {
 312                 if (c->port & (1 << i)) {
 313                         ports |= vlan_ports[i];
 314
 315                         cfg = adm_rreg(0, port_conf[i]);
 316
 317                         /* Tagging */
 318                         if (c->untag & (1 << i))
 319                                 cfg &= ~(1 << 4);
 320                         else
 321                                 cfg |= (1 << 4);
 322
 323                         if ((c->untag | c->pvid) & (1 << i)) {
 324                                 cfg = (cfg & ~(0xf << 10)) | (nr << 10);
 325                         }
 326
 327                         adm_wreg(port_conf[i], (__u16) cfg);
 328                 } else {
 329                         ports &= ~(vlan_ports[i]);
 330                 }
 331         }
 332         adm_wreg(0x13 + nr, (__u16) ports);
 333
 334         return 0;
 335 }
 336
 337 static int handle_port_enable_read(void *driver, char *buf, int nr)
 338 {
 339         return sprintf(buf, "%d\n", ((adm_rreg(0, port_conf[nr]) & (1 << 5)) ? 0 : 1));
 340 }
 341
 342 static int handle_port_enable_write(void *driver, char *buf, int nr)
 343 {
 344         int reg = adm_rreg(0, port_conf[nr]);
 345
 346         if (buf[0] == '0')
 347                 reg |= (1 << 5);
 348         else if (buf[0] == '1')
 349                 reg &= ~(1 << 5);
 350         else return -1;
 351
 352         adm_wreg(port_conf[nr], (__u16) reg);
 353         return 0;
 354 }
 355
 356 static int handle_port_media_read(void *driver, char *buf, int nr)
 357 {
 358         int len;
 359         int media = 0;
 360         int reg = adm_rreg(0, port_conf[nr]);
 361
 362         if (reg & (1 << 1))
 363                 media |= SWITCH_MEDIA_AUTO;
 364         if (reg & (1 << 2))
 365                 media |= SWITCH_MEDIA_100;
 366         if (reg & (1 << 3))
 367                 media |= SWITCH_MEDIA_FD;
 368
 369         len = switch_print_media(buf, media);
 370         return len + sprintf(buf + len, "\n");
 371 }
 372
 373 static int handle_port_media_write(void *driver, char *buf, int nr)
 374 {
 375         int media = switch_parse_media(buf);
 376         int reg = adm_rreg(0, port_conf[nr]);
 377
 378         if (media < 0)
 379                 return -1;
 380
 381         reg &= ~((1 << 1) | (1 << 2) | (1 << 3));
 382         if (media & SWITCH_MEDIA_AUTO)
 383                 reg |= 1 << 1;
 384         if (media & SWITCH_MEDIA_100)
 385                 reg |= 1 << 2;
 386         if (media & SWITCH_MEDIA_FD)
 387                 reg |= 1 << 3;
 388
 389         adm_wreg(port_conf[nr], reg);
 390
 391         return 0;
 392 }
 393
 394 static int handle_vlan_enable_read(void *driver, char *buf, int nr)
 395 {
 396         return sprintf(buf, "%d\n", ((adm_rreg(0, 0x11) & (1 << 5)) ? 1 : 0));
 397 }
 398
 399 static int handle_vlan_enable_write(void *driver, char *buf, int nr)
 400 {
 401         int reg = adm_rreg(0, 0x11);
 402
 403         if (buf[0] == '1')
 404                 reg |= (1 << 5);
 405         else if (buf[0] == '0')
 406                 reg &= ~(1 << 5);
 407         else return -1;
 408
 409         adm_wreg(0x11, (__u16) reg);
 410         return 0;
 411 }
 412
 413 static int handle_reset(void *driver, char *buf, int nr)
 414 {
 415         int i;
 416         u32 cfg;
 417
 418         /*
 419          * Reset sequence: RC high->low(100ms)->high(30ms)
 420          *
 421          * WAR: Certain boards don't have the correct power on
 422          * reset logic therefore we must explicitly perform the
 423          * sequence in software.
 424          */
 425         if (eerc) {
 426                 /* Keep RC high for at least 20ms */
 427                 adm_enout(eerc, eerc);
 428                 for (i = 0; i < 20; i ++)
 429                         udelay(1000);
 430                 /* Keep RC low for at least 100ms */
 431                 adm_enout(eerc, 0);
 432                 for (i = 0; i < 100; i++)
 433                         udelay(1000);
 434                 /* Set default configuration */
 435                 adm_enout((__u8)(eesk | eedi), eesk);
 436                 /* Keep RC high for at least 30ms */
 437                 adm_enout(eerc, eerc);
 438                 for (i = 0; i < 30; i++)
 439                         udelay(1000);
 440                 /* Leave RC high and disable GPIO outputs */
 441                 adm_disout((__u8)(eecs | eesk | eedi));
 442
 443         }
 444
 445         /* set up initial configuration for cpu port */
 446         cfg = (0x8000 | /* Auto MDIX */
 447               (0xf << 10) | /* PVID */
 448                   (1 << 4) | /* Tagging */
 449                   0xf); /* full duplex, 100Mbps, auto neg, flow ctrl */
 450         adm_wreg(port_conf[5], cfg);
 451
 452         /* vlan mode select register (0x11): vlan on, mac clone */
 453         adm_wreg(0x11, 0xff30);
 454
 455         return 0;
 456 }
 457
 458 static int handle_registers(void *driver, char *buf, int nr)
 459 {
 460         int i, len = 0;
 461
 462         for (i = 0; i <= 0x33; i++) {
 463                 len += sprintf(buf + len, "0x%02x: 0x%04x\n", i, adm_rreg(0, i));
 464         }
 465
 466         return len;
 467 }
 468
 469 static int handle_counters(void *driver, char *buf, int nr)
 470 {
 471         int i, len = 0;
 472
 473         for (i = 0; i <= 0x3c; i++) {
 474                 len += sprintf(buf + len, "0x%02x: 0x%08x\n", i, adm_rreg(1, i));
 475         }
 476
 477         return len;
 478 }
 479
 480 static int detect_adm()
 481 {
 482         int ret = 0;
 483
 484 #if defined(BCMGPIO2) || defined(BCMGPIO)
 485         int boardflags = atoi(nvram_get("boardflags"));
 486
 487         if ((boardflags & 0x80) || force) {
 488                 ret = 1;
 489
 490                 eecs = getgpiopin("adm_eecs", 2);
 491                 eesk = getgpiopin("adm_eesk", 3);
 492                 eedi = getgpiopin("adm_eedi", 4);
 493                 eerc = getgpiopin("adm_rc", 0);
 494
 495         } else if ((strcmp(nvram_get("boardtype") ?: "", "bcm94710dev") == 0) &&
 496                         (strncmp(nvram_get("boardnum") ?: "", "42", 2) == 0)) {
 497                 /* WRT54G v1.1 hack */
 498                 eecs = 2;
 499                 eesk = 3;
 500                 eedi = 5;
 501
 502                 ret = 1;
 503         } else
 504                 printk("BFL_ENETADM not set in boardflags. Use force=1 to ignore.\n");
 505
 506         if (eecs)
 507                 eecs = (1 << eecs);
 508         if (eesk)
 509                 eesk = (1 << eesk);
 510         if (eedi)
 511                 eedi = (1 << eedi);
 512         if (eerc)
 513                 eerc = (1 << eerc);
 514 #else
 515         ret = 1;
 516 #endif
 517
 518         return ret;
 519 }
 520
 521 static int __init adm_init()
 522 {
 523         switch_config cfg[] = {
 524                 {"registers", handle_registers, NULL},
 525                 {"counters", handle_counters, NULL},
 526                 {"reset", NULL, handle_reset},
 527                 {"enable_vlan", handle_vlan_enable_read, handle_vlan_enable_write},
 528                 {NULL, NULL, NULL}
 529         };
 530         switch_config port[] = {
 531                 {"enable", handle_port_enable_read, handle_port_enable_write},
 532                 {"media", handle_port_media_read, handle_port_media_write},
 533                 {NULL, NULL, NULL}
 534         };
 535         switch_config vlan[] = {
 536                 {"ports", handle_vlan_port_read, handle_vlan_port_write},
 537                 {NULL, NULL, NULL}
 538         };
 539         switch_driver driver = {
 540                 name: DRIVER_NAME,
 541                 version: DRIVER_VERSION,
 542                 interface: "eth0",
 543                 ports: 6,
 544                 cpuport: 5,
 545                 vlans: 16,
 546                 driver_handlers: cfg,
 547                 port_handlers: port,
 548                 vlan_handlers: vlan,
 549         };
 550
 551         if (!detect_adm())
 552                 return -ENODEV;
 553
 554         return switch_register_driver(&driver);
 555 }
 556
 557 static void __exit adm_exit()
 558 {
 559         switch_unregister_driver(DRIVER_NAME);
 560 }
 561
 562
 563 module_init(adm_init);
 564 module_exit(adm_exit);