kernel/drivers/staging/rtl8712/rtl8712_efuse.c

   1 /*
   2  * rtl8712_efuse.c
   3  *
   4  * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
   5  * Linux device driver for RTL8192SU
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  19  *
  20  * Modifications for inclusion into the Linux staging tree are
  21  * Copyright(c) 2010 Larry Finger. All rights reserved.
  22  *
  23  * Contact information:
  24  * WLAN FAE <wlanfae@realtek.com>.
  25  * Larry Finger <Larry.Finger@lwfinger.net>
  26  *
  27  ******************************************************************************/
  28
  29 #define _RTL8712_EFUSE_C_
  30
  31 #include "osdep_service.h"
  32 #include "drv_types.h"
  33 #include "rtl8712_efuse.h"
  34
  35 /* reserve 3 bytes for HW stop read */
  36 static int efuse_available_max_size = EFUSE_MAX_SIZE - 3 /*0x1FD*/;
  37
  38 static void efuse_reg_ctrl(struct _adapter *padapter, u8 bPowerOn)
  39 {
  40         u8 tmpu8 = 0;
  41
  42         if (true == bPowerOn) {
  43                 /* -----------------e-fuse pwr & clk reg ctrl ---------------
  44                  * Enable LDOE25 Macro Block
  45                  */
  46                 tmpu8 = r8712_read8(padapter, EFUSE_TEST + 3);
  47                 tmpu8 |= 0x80;
  48                 r8712_write8(padapter, EFUSE_TEST + 3, tmpu8);
  49                 msleep(20); /* for some platform , need some delay time */
  50                 /* Change Efuse Clock for write action to 40MHZ */
  51                 r8712_write8(padapter, EFUSE_CLK_CTRL, 0x03);
  52                 msleep(20); /* for some platform , need some delay time */
  53         } else {
  54                 /* -----------------e-fuse pwr & clk reg ctrl -----------------
  55                  * Disable LDOE25 Macro Block
  56                  */
  57                 tmpu8 = r8712_read8(padapter, EFUSE_TEST + 3);
  58                 tmpu8 &= 0x7F;
  59                 r8712_write8(padapter, EFUSE_TEST + 3, tmpu8);
  60                 /* Change Efuse Clock for write action to 500K */
  61                 r8712_write8(padapter, EFUSE_CLK_CTRL, 0x02);
  62         }
  63 }
  64
  65 /*
  66  * Before write E-Fuse, this function must be called.
  67  */
  68 u8 r8712_efuse_reg_init(struct _adapter *padapter)
  69 {
  70         return true;
  71 }
  72
  73 void r8712_efuse_reg_uninit(struct _adapter *padapter)
  74 {
  75         efuse_reg_ctrl(padapter, false);
  76 }
  77
  78 static u8 efuse_one_byte_read(struct _adapter *padapter, u16 addr, u8 *data)
  79 {
  80         u8 tmpidx = 0, bResult;
  81
  82         /* -----------------e-fuse reg ctrl --------------------------------- */
  83         r8712_write8(padapter, EFUSE_CTRL+1, (u8)(addr&0xFF)); /* address */
  84         r8712_write8(padapter, EFUSE_CTRL+2, ((u8)((addr>>8)&0x03)) |
  85                (r8712_read8(padapter, EFUSE_CTRL+2)&0xFC));
  86         r8712_write8(padapter, EFUSE_CTRL+3, 0x72); /* read cmd */
  87         /* wait for complete */
  88         while (!(0x80 & r8712_read8(padapter, EFUSE_CTRL+3)) && (tmpidx < 100))
  89                 tmpidx++;
  90         if (tmpidx < 100) {
  91                 *data = r8712_read8(padapter, EFUSE_CTRL);
  92                 bResult = true;
  93         } else {
  94                 *data = 0xff;
  95                 bResult = false;
  96         }
  97         return bResult;
  98 }
  99
 100 static u8 efuse_one_byte_write(struct _adapter *padapter, u16 addr, u8 data)
 101 {
 102         u8 tmpidx = 0, bResult;
 103
 104         /* -----------------e-fuse reg ctrl -------------------------------- */
 105         r8712_write8(padapter, EFUSE_CTRL+1, (u8)(addr&0xFF)); /* address */
 106         r8712_write8(padapter, EFUSE_CTRL+2, ((u8)((addr>>8)&0x03)) |
 107                (r8712_read8(padapter, EFUSE_CTRL+2)&0xFC));
 108         r8712_write8(padapter, EFUSE_CTRL, data); /* data */
 109         r8712_write8(padapter, EFUSE_CTRL+3, 0xF2); /* write cmd */
 110         /* wait for complete */
 111         while ((0x80 &  r8712_read8(padapter, EFUSE_CTRL+3)) && (tmpidx < 100))
 112                 tmpidx++;
 113         if (tmpidx < 100)
 114                 bResult = true;
 115         else
 116                 bResult = false;
 117         return bResult;
 118 }
 119
 120 static u8 efuse_one_byte_rw(struct _adapter *padapter, u8 bRead, u16 addr,
 121                             u8 *data)
 122 {
 123         u8 tmpidx = 0, tmpv8 = 0, bResult;
 124
 125         /* -----------------e-fuse reg ctrl --------------------------------- */
 126         r8712_write8(padapter, EFUSE_CTRL+1, (u8)(addr&0xFF)); /* address */
 127         tmpv8 = ((u8)((addr >> 8) & 0x03)) |
 128                  (r8712_read8(padapter, EFUSE_CTRL + 2) & 0xFC);
 129         r8712_write8(padapter, EFUSE_CTRL+2, tmpv8);
 130         if (true == bRead) {
 131                 r8712_write8(padapter, EFUSE_CTRL+3,  0x72); /* read cmd */
 132                 while (!(0x80 & r8712_read8(padapter, EFUSE_CTRL+3)) &&
 133                        (tmpidx < 100))
 134                         tmpidx++;
 135                 if (tmpidx < 100) {
 136                         *data = r8712_read8(padapter, EFUSE_CTRL);
 137                         bResult = true;
 138                 } else {
 139                         *data = 0;
 140                         bResult = false;
 141                 }
 142         } else {
 143                 r8712_write8(padapter, EFUSE_CTRL, *data); /* data */
 144                 r8712_write8(padapter, EFUSE_CTRL+3, 0xF2); /* write cmd */
 145                 while ((0x80 & r8712_read8(padapter, EFUSE_CTRL+3)) &&
 146                        (tmpidx < 100))
 147                         tmpidx++;
 148                 if (tmpidx < 100)
 149                         bResult = true;
 150                 else
 151                         bResult = false;
 152         }
 153         return bResult;
 154 }
 155
 156 static u8 efuse_is_empty(struct _adapter *padapter, u8 *empty)
 157 {
 158         u8 value, ret = true;
 159
 160         /* read one byte to check if E-Fuse is empty */
 161         if (efuse_one_byte_rw(padapter, true, 0, &value) == true) {
 162                 if (0xFF == value)
 163                         *empty = true;
 164                 else
 165                         *empty = false;
 166         } else
 167                 ret = false;
 168         return ret;
 169 }
 170
 171 void r8712_efuse_change_max_size(struct _adapter *padapter)
 172 {
 173         u16 pre_pg_data_saddr = 0x1FB;
 174         u16 i;
 175         u16 pre_pg_data_size = 5;
 176         u8 pre_pg_data[5];
 177
 178         for (i = 0; i < pre_pg_data_size; i++)
 179                 efuse_one_byte_read(padapter, pre_pg_data_saddr + i,
 180                                     &pre_pg_data[i]);
 181         if ((pre_pg_data[0] == 0x03) && (pre_pg_data[1] == 0x00) &&
 182             (pre_pg_data[2] == 0x00) && (pre_pg_data[3] == 0x00) &&
 183             (pre_pg_data[4] == 0x0C))
 184                 efuse_available_max_size -= pre_pg_data_size;
 185 }
 186
 187 int r8712_efuse_get_max_size(struct _adapter *padapter)
 188 {
 189         return  efuse_available_max_size;
 190 }
 191
 192 static u8 calculate_word_cnts(const u8 word_en)
 193 {
 194         u8 word_cnts = 0;
 195         u8 word_idx;
 196
 197         for (word_idx = 0; word_idx < PGPKG_MAX_WORDS; word_idx++)
 198                 if (!(word_en & BIT(word_idx)))
 199                         word_cnts++; /* 0 : write enable */
 200         return word_cnts;
 201 }
 202
 203 static void pgpacket_copy_data(const u8 word_en, const u8 *sourdata,
 204                                u8 *targetdata)
 205 {
 206         u8 tmpindex = 0;
 207         u8 word_idx, byte_idx;
 208
 209         for (word_idx = 0; word_idx < PGPKG_MAX_WORDS; word_idx++) {
 210                 if (!(word_en&BIT(word_idx))) {
 211                         byte_idx = word_idx * 2;
 212                         targetdata[byte_idx] = sourdata[tmpindex++];
 213                         targetdata[byte_idx + 1] = sourdata[tmpindex++];
 214                 }
 215         }
 216 }
 217
 218 u16 r8712_efuse_get_current_size(struct _adapter *padapter)
 219 {
 220         int bContinual = true;
 221         u16 efuse_addr = 0;
 222         u8 hworden = 0;
 223         u8 efuse_data, word_cnts = 0;
 224
 225         while (bContinual && efuse_one_byte_read(padapter, efuse_addr,
 226                &efuse_data) && (efuse_addr < efuse_available_max_size)) {
 227                 if (efuse_data != 0xFF) {
 228                         hworden =  efuse_data & 0x0F;
 229                         word_cnts = calculate_word_cnts(hworden);
 230                         /* read next header */
 231                         efuse_addr = efuse_addr + (word_cnts * 2) + 1;
 232                 } else
 233                         bContinual = false;
 234         }
 235         return efuse_addr;
 236 }
 237
 238 u8 r8712_efuse_pg_packet_read(struct _adapter *padapter, u8 offset, u8 *data)
 239 {
 240         u8 hoffset = 0, hworden = 0, word_cnts = 0;
 241         u16 efuse_addr = 0;
 242         u8 efuse_data;
 243         u8 tmpidx = 0;
 244         u8 tmpdata[PGPKT_DATA_SIZE];
 245         u8 ret = true;
 246
 247         if (data == NULL)
 248                 return false;
 249         if (offset > 0x0f)
 250                 return false;
 251         memset(data, 0xFF, sizeof(u8)*PGPKT_DATA_SIZE);
 252         while (efuse_addr < efuse_available_max_size) {
 253                 if (efuse_one_byte_read(padapter, efuse_addr, &efuse_data) ==
 254                     true) {
 255                         if (efuse_data == 0xFF)
 256                                 break;
 257                         hoffset = (efuse_data >> 4) & 0x0F;
 258                         hworden =  efuse_data & 0x0F;
 259                         word_cnts = calculate_word_cnts(hworden);
 260                         if (hoffset == offset) {
 261                                 memset(tmpdata, 0xFF, PGPKT_DATA_SIZE);
 262                                 for (tmpidx = 0; tmpidx < word_cnts * 2;
 263                                      tmpidx++) {
 264                                         if (efuse_one_byte_read(padapter,
 265                                             efuse_addr+1+tmpidx, &efuse_data) ==
 266                                              true) {
 267                                                 tmpdata[tmpidx] = efuse_data;
 268                                         } else
 269                                                 ret = false;
 270                                 }
 271                                 pgpacket_copy_data(hworden, tmpdata, data);
 272                         }
 273                         efuse_addr += 1 + (word_cnts*2);
 274                 } else {
 275                         ret = false;
 276                         break;
 277                 }
 278         }
 279         return ret;
 280 }
 281
 282 static u8 fix_header(struct _adapter *padapter, u8 header, u16 header_addr)
 283 {
 284         struct PGPKT_STRUCT pkt;
 285         u8 offset, word_en, value;
 286         u16 addr;
 287         int i;
 288         u8 ret = true;
 289
 290         pkt.offset = GET_EFUSE_OFFSET(header);
 291         pkt.word_en = GET_EFUSE_WORD_EN(header);
 292         addr = header_addr + 1 + calculate_word_cnts(pkt.word_en) * 2;
 293         if (addr > efuse_available_max_size)
 294                 return false;
 295         /* retrieve original data */
 296         addr = 0;
 297         while (addr < header_addr) {
 298                 if (efuse_one_byte_read(padapter, addr++, &value) == false) {
 299                         ret = false;
 300                         break;
 301                 }
 302                 offset = GET_EFUSE_OFFSET(value);
 303                 word_en = GET_EFUSE_WORD_EN(value);
 304                 if (pkt.offset != offset) {
 305                         addr += calculate_word_cnts(word_en)*2;
 306                         continue;
 307                 }
 308                 for (i = 0; i < PGPKG_MAX_WORDS; i++) {
 309                         if (BIT(i) & word_en) {
 310                                 if (BIT(i) & pkt.word_en) {
 311                                         if (efuse_one_byte_read(
 312                                                         padapter, addr,
 313                                                         &value) == true)
 314                                                 pkt.data[i*2] = value;
 315                                         else
 316                                                 return false;
 317                                         if (efuse_one_byte_read(
 318                                                         padapter,
 319                                                         addr + 1,
 320                                                         &value) == true)
 321                                                 pkt.data[i*2 + 1] =
 322                                                         value;
 323                                         else
 324                                                 return false;
 325                                 }
 326                                 addr += 2;
 327                         }
 328                 }
 329         }
 330         if (addr != header_addr)
 331                 return false;
 332         addr++;
 333         /* fill original data */
 334         for (i = 0; i < PGPKG_MAX_WORDS; i++) {
 335                 if (BIT(i) & pkt.word_en) {
 336                         efuse_one_byte_write(padapter, addr, pkt.data[i*2]);
 337                         efuse_one_byte_write(padapter, addr+1,
 338                                         pkt.data[i*2 + 1]);
 339                         /* additional check */
 340                         if (efuse_one_byte_read(padapter, addr, &value)
 341                                 == false)
 342                                 ret = false;
 343                         else if (pkt.data[i*2] != value) {
 344                                 ret = false;
 345                                 if (0xFF == value) /* write again */
 346                                         efuse_one_byte_write(padapter, addr,
 347                                                         pkt.data[i * 2]);
 348                         }
 349                         if (efuse_one_byte_read(padapter, addr+1, &value) ==
 350                                 false)
 351                                 ret = false;
 352                         else if (pkt.data[i*2 + 1] != value) {
 353                                 ret = false;
 354                                 if (0xFF == value) /* write again */
 355                                         efuse_one_byte_write(padapter, addr+1,
 356                                                         pkt.data[i*2 + 1]);
 357                         }
 358                 }
 359                 addr += 2;
 360         }
 361         return ret;
 362 }
 363
 364 u8 r8712_efuse_pg_packet_write(struct _adapter *padapter, const u8 offset,
 365                          const u8 word_en, const u8 *data)
 366 {
 367         u8 pg_header = 0;
 368         u16 efuse_addr = 0, curr_size = 0;
 369         u8 efuse_data, target_word_cnts = 0;
 370         static int repeat_times;
 371         int sub_repeat;
 372         u8 bResult = true;
 373
 374         /* check if E-Fuse Clock Enable and E-Fuse Clock is 40M */
 375         efuse_data = r8712_read8(padapter, EFUSE_CLK_CTRL);
 376         if (efuse_data != 0x03)
 377                 return false;
 378         pg_header = MAKE_EFUSE_HEADER(offset, word_en);
 379         target_word_cnts = calculate_word_cnts(word_en);
 380         repeat_times = 0;
 381         efuse_addr = 0;
 382         while (efuse_addr < efuse_available_max_size) {
 383                 curr_size = r8712_efuse_get_current_size(padapter);
 384                 if ((curr_size + 1 + target_word_cnts * 2) >
 385                      efuse_available_max_size)
 386                         return false; /*target_word_cnts + pg header(1 byte)*/
 387                 efuse_addr = curr_size; /* current size is also the last addr*/
 388                 efuse_one_byte_write(padapter, efuse_addr, pg_header); /*hdr*/
 389                 sub_repeat = 0;
 390                 /* check if what we read is what we write */
 391                 while (efuse_one_byte_read(padapter, efuse_addr,
 392                                            &efuse_data) == false) {
 393                         if (++sub_repeat > _REPEAT_THRESHOLD_) {
 394                                 bResult = false; /* continue to blind write */
 395                                 break; /* continue to blind write */
 396                         }
 397                 }
 398                 if ((sub_repeat > _REPEAT_THRESHOLD_) ||
 399                     (pg_header == efuse_data)) {
 400                         /* write header ok OR can't check header(creep) */
 401                         u8 i;
 402
 403                         /* go to next address */
 404                         efuse_addr++;
 405                         for (i = 0; i < target_word_cnts*2; i++) {
 406                                 efuse_one_byte_write(padapter,
 407                                                      efuse_addr + i,
 408                                                      *(data + i));
 409                                 if (efuse_one_byte_read(padapter,
 410                                     efuse_addr + i, &efuse_data) == false)
 411                                         bResult = false;
 412                                 else if (*(data+i) != efuse_data) /* fail */
 413                                         bResult = false;
 414                         }
 415                         break;
 416                 }
 417                 /* write header fail */
 418                 bResult = false;
 419                 if (0xFF == efuse_data)
 420                         return bResult; /* nothing damaged. */
 421                 /* call rescue procedure */
 422                 if (!fix_header(padapter, efuse_data, efuse_addr))
 423                         return false; /* rescue fail */
 424
 425                 if (++repeat_times > _REPEAT_THRESHOLD_) /* fail */
 426                         break;
 427                 /* otherwise, take another risk... */
 428         }
 429         return bResult;
 430 }
 431
 432 u8 r8712_efuse_access(struct _adapter *padapter, u8 bRead, u16 start_addr,
 433                       u16 cnts, u8 *data)
 434 {
 435         int i;
 436         u8 res = true;
 437
 438         if (start_addr > EFUSE_MAX_SIZE)
 439                 return false;
 440         if ((bRead == false) && ((start_addr + cnts) >
 441            efuse_available_max_size))
 442                 return false;
 443         if ((false == bRead) && (r8712_efuse_reg_init(padapter) == false))
 444                 return false;
 445         /* -----------------e-fuse one byte read / write ---------------------*/
 446         for (i = 0; i < cnts; i++) {
 447                 if ((start_addr + i) > EFUSE_MAX_SIZE) {
 448                         res = false;
 449                         break;
 450                 }
 451                 res = efuse_one_byte_rw(padapter, bRead, start_addr + i,
 452                       data + i);
 453                 if ((false == bRead) && (false == res))
 454                         break;
 455         }
 456         if (false == bRead)
 457                 r8712_efuse_reg_uninit(padapter);
 458         return res;
 459 }
 460
 461 u8 r8712_efuse_map_read(struct _adapter *padapter, u16 addr, u16 cnts, u8 *data)
 462 {
 463         u8 offset, ret = true;
 464         u8 pktdata[PGPKT_DATA_SIZE];
 465         int i, idx;
 466
 467         if ((addr + cnts) > EFUSE_MAP_MAX_SIZE)
 468                 return false;
 469         if ((efuse_is_empty(padapter, &offset) == true) && (offset ==
 470              true)) {
 471                 for (i = 0; i < cnts; i++)
 472                         data[i] = 0xFF;
 473                 return ret;
 474         }
 475         offset = (addr >> 3) & 0xF;
 476         ret = r8712_efuse_pg_packet_read(padapter, offset, pktdata);
 477         i = addr & 0x7; /* pktdata index */
 478         idx = 0;        /* data index */
 479
 480         do {
 481                 for (; i < PGPKT_DATA_SIZE; i++) {
 482                         data[idx++] = pktdata[i];
 483                         if (idx == cnts)
 484                                 return ret;
 485                 }
 486                 offset++;
 487                 if (!r8712_efuse_pg_packet_read(padapter, offset, pktdata))
 488                         ret = false;
 489                 i = 0;
 490         } while (1);
 491         return ret;
 492 }
 493
 494 u8 r8712_efuse_map_write(struct _adapter *padapter, u16 addr, u16 cnts,
 495                          u8 *data)
 496 {
 497         u8 offset, word_en, empty;
 498         u8 pktdata[PGPKT_DATA_SIZE], newdata[PGPKT_DATA_SIZE];
 499         int i, j, idx;
 500
 501         if ((addr + cnts) > EFUSE_MAP_MAX_SIZE)
 502                 return false;
 503         /* check if E-Fuse Clock Enable and E-Fuse Clock is 40M */
 504         empty = r8712_read8(padapter, EFUSE_CLK_CTRL);
 505         if (empty != 0x03)
 506                 return false;
 507         if (efuse_is_empty(padapter, &empty) == true) {
 508                 if (true == empty)
 509                         memset(pktdata, 0xFF, PGPKT_DATA_SIZE);
 510         } else
 511                 return false;
 512         offset = (addr >> 3) & 0xF;
 513         if (empty == false)
 514                 if (!r8712_efuse_pg_packet_read(padapter, offset, pktdata))
 515                         return false;
 516         word_en = 0xF;
 517         memset(newdata, 0xFF, PGPKT_DATA_SIZE);
 518         i = addr & 0x7; /* pktdata index */
 519         j = 0;          /* newdata index */
 520         idx = 0;        /* data index */
 521
 522         if (i & 0x1) {
 523                 /*  odd start */
 524                 if (data[idx] != pktdata[i]) {
 525                         word_en &= ~BIT(i >> 1);
 526                         newdata[j++] = pktdata[i - 1];
 527                         newdata[j++] = data[idx];
 528                 }
 529                 i++;
 530                 idx++;
 531         }
 532         do {
 533                 for (; i < PGPKT_DATA_SIZE; i += 2) {
 534                         if ((cnts - idx) == 1) {
 535                                 if (data[idx] != pktdata[i]) {
 536                                         word_en &= ~BIT(i >> 1);
 537                                         newdata[j++] = data[idx];
 538                                         newdata[j++] = pktdata[1 + 1];
 539                                 }
 540                                 idx++;
 541                                 break;
 542                         }
 543
 544                         if ((data[idx] != pktdata[i]) || (data[idx+1] !=
 545                              pktdata[i+1])) {
 546                                 word_en &= ~BIT(i >> 1);
 547                                 newdata[j++] = data[idx];
 548                                 newdata[j++] = data[idx + 1];
 549                         }
 550                         idx += 2;
 551
 552                         if (idx == cnts)
 553                                 break;
 554                 }
 555
 556                 if (word_en != 0xF)
 557                         if (r8712_efuse_pg_packet_write(padapter, offset,
 558                             word_en, newdata) == false)
 559                                 return false;
 560                 if (idx == cnts)
 561                         break;
 562                 offset++;
 563                 if (empty == false)
 564                         if (!r8712_efuse_pg_packet_read(padapter, offset,
 565                             pktdata))
 566                                 return false;
 567                 i = 0;
 568                 j = 0;
 569                 word_en = 0xF;
 570                 memset(newdata, 0xFF, PGPKT_DATA_SIZE);
 571         } while (1);
 572
 573         return true;
 574 }