arch/powerpc/cpu/mpc85xx/fsl_corenet_serdes.c

   1 /*
   2  * Copyright 2009-2011 Freescale Semiconductor, Inc.
   3  *
   4  * See file CREDITS for list of people who contributed to this
   5  * project.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of
  10  * the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  20  * MA 02111-1307 USA
  21  */
  22
  23 #include <common.h>
  24 #ifdef CONFIG_SYS_P4080_ERRATUM_SERDES8
  25 #include <hwconfig.h>
  26 #endif
  27 #include <asm/fsl_serdes.h>
  28 #include <asm/immap_85xx.h>
  29 #include <asm/io.h>
  30 #include <asm/processor.h>
  31 #include <asm/fsl_law.h>
  32 #include "fsl_corenet_serdes.h"
  33
  34 static u32 serdes_prtcl_map;
  35
  36 #define HWCONFIG_BUFFER_SIZE    128
  37
  38 #ifdef DEBUG
  39 static const char *serdes_prtcl_str[] = {
  40         [NONE] = "NA",
  41         [PCIE1] = "PCIE1",
  42         [PCIE2] = "PCIE2",
  43         [PCIE3] = "PCIE3",
  44         [PCIE4] = "PCIE4",
  45         [SATA1] = "SATA1",
  46         [SATA2] = "SATA2",
  47         [SRIO1] = "SRIO1",
  48         [SRIO2] = "SRIO2",
  49         [SGMII_FM1_DTSEC1] = "SGMII_FM1_DTSEC1",
  50         [SGMII_FM1_DTSEC2] = "SGMII_FM1_DTSEC2",
  51         [SGMII_FM1_DTSEC3] = "SGMII_FM1_DTSEC3",
  52         [SGMII_FM1_DTSEC4] = "SGMII_FM1_DTSEC4",
  53         [SGMII_FM1_DTSEC5] = "SGMII_FM1_DTSEC5",
  54         [SGMII_FM2_DTSEC1] = "SGMII_FM2_DTSEC1",
  55         [SGMII_FM2_DTSEC2] = "SGMII_FM2_DTSEC2",
  56         [SGMII_FM2_DTSEC3] = "SGMII_FM2_DTSEC3",
  57         [SGMII_FM2_DTSEC4] = "SGMII_FM2_DTSEC4",
  58         [XAUI_FM1] = "XAUI_FM1",
  59         [XAUI_FM2] = "XAUI_FM2",
  60         [AURORA] = "DEBUG",
  61 };
  62 #endif
  63
  64 static const struct {
  65         int idx;
  66         unsigned int lpd; /* RCW lane powerdown bit */
  67         int bank;
  68 } lanes[SRDS_MAX_LANES] = {
  69         { 0, 152, FSL_SRDS_BANK_1 },
  70         { 1, 153, FSL_SRDS_BANK_1 },
  71         { 2, 154, FSL_SRDS_BANK_1 },
  72         { 3, 155, FSL_SRDS_BANK_1 },
  73         { 4, 156, FSL_SRDS_BANK_1 },
  74         { 5, 157, FSL_SRDS_BANK_1 },
  75         { 6, 158, FSL_SRDS_BANK_1 },
  76         { 7, 159, FSL_SRDS_BANK_1 },
  77         { 8, 160, FSL_SRDS_BANK_1 },
  78         { 9, 161, FSL_SRDS_BANK_1 },
  79         { 16, 162, FSL_SRDS_BANK_2 },
  80         { 17, 163, FSL_SRDS_BANK_2 },
  81         { 18, 164, FSL_SRDS_BANK_2 },
  82         { 19, 165, FSL_SRDS_BANK_2 },
  83         { 20, 170, FSL_SRDS_BANK_3 },
  84         { 21, 171, FSL_SRDS_BANK_3 },
  85         { 22, 172, FSL_SRDS_BANK_3 },
  86         { 23, 173, FSL_SRDS_BANK_3 },
  87 };
  88
  89 int serdes_get_lane_idx(int lane)
  90 {
  91         return lanes[lane].idx;
  92 }
  93
  94 int serdes_get_bank(int lane)
  95 {
  96         return lanes[lane].bank;
  97 }
  98
  99 int serdes_lane_enabled(int lane)
 100 {
 101         ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
 102         serdes_corenet_t *regs = (void *)CONFIG_SYS_FSL_CORENET_SERDES_ADDR;
 103
 104         int bank = lanes[lane].bank;
 105         int word = lanes[lane].lpd / 32;
 106         int bit = lanes[lane].lpd % 32;
 107
 108         if (in_be32(&regs->bank[bank].rstctl) & SRDS_RSTCTL_SDPD)
 109                 return 0;
 110
 111 #ifdef CONFIG_SYS_P4080_ERRATUM_SERDES8
 112         /*
 113          * For banks two and three, use the srds_lpd_b[] array instead of the
 114          * RCW, because this array contains the real values of SRDS_LPD_B2 and
 115          * SRDS_LPD_B3.
 116          */
 117         if (bank > 0)
 118                 return !(srds_lpd_b[bank] & (8 >> (lane - (6 + 4 * bank))));
 119 #endif
 120
 121         return !(in_be32(&gur->rcwsr[word]) & (0x80000000 >> bit));
 122 }
 123
 124 int is_serdes_configured(enum srds_prtcl device)
 125 {
 126         ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
 127
 128         /* Is serdes enabled at all? */
 129         if (!(in_be32(&gur->rcwsr[5]) & FSL_CORENET_RCWSR5_SRDS_EN))
 130                 return 0;
 131
 132         return (1 << device) & serdes_prtcl_map;
 133 }
 134
 135 #ifndef CONFIG_SYS_DCSRBAR_PHYS
 136 #define CONFIG_SYS_DCSRBAR_PHYS 0x80000000 /* Must be 1GB-aligned for rev1.0 */
 137 #define CONFIG_SYS_DCSRBAR      0x80000000
 138 #define __DCSR_NOT_DEFINED_BY_CONFIG
 139 #endif
 140
 141 #ifdef CONFIG_SYS_P4080_ERRATUM_SERDES8
 142 static void enable_bank(ccsr_gur_t *gur, int bank)
 143 {
 144         u32 rcw5;
 145
 146         /*
 147          * Enable the lanes SRDS_LPD_Bn.  The RCW bits are read-only in
 148          * CCSR, and read/write in DSCR.
 149          */
 150         rcw5 = in_be32(gur->rcwsr + 5);
 151         if (bank == FSL_SRDS_BANK_2) {
 152                 rcw5 &= ~FSL_CORENET_RCWSRn_SRDS_LPD_B2;
 153                 rcw5 |= srds_lpd_b[bank] << 26;
 154         } else if (bank == FSL_SRDS_BANK_3) {
 155                 rcw5 &= ~FSL_CORENET_RCWSRn_SRDS_LPD_B3;
 156                 rcw5 |= srds_lpd_b[bank] << 18;
 157         } else {
 158                 printf("SERDES: enable_bank: bad bank %d\n", bank + 1);
 159                 return;
 160         }
 161
 162         /* See similar code in cpu/mpc85xx/cpu_init.c for an explanation
 163          * of the DCSR mapping.
 164          */
 165         {
 166 #ifdef __DCSR_NOT_DEFINED_BY_CONFIG
 167                 struct law_entry law = find_law(CONFIG_SYS_DCSRBAR_PHYS);
 168                 int law_index;
 169                 if (law.index == -1)
 170                         law_index = set_next_law(CONFIG_SYS_DCSRBAR_PHYS,
 171                                                  LAW_SIZE_1M, LAW_TRGT_IF_DCSR);
 172                 else
 173                         set_law(law.index, CONFIG_SYS_DCSRBAR_PHYS, LAW_SIZE_1M,
 174                                 LAW_TRGT_IF_DCSR);
 175 #endif
 176                 u32 *p = (void *)CONFIG_SYS_DCSRBAR + 0x20114;
 177                 out_be32(p, rcw5);
 178 #ifdef __DCSR_NOT_DEFINED_BY_CONFIG
 179                 if (law.index == -1)
 180                         disable_law(law_index);
 181                 else
 182                         set_law(law.index, law.addr, law.size, law.trgt_id);
 183 #endif
 184         }
 185 }
 186
 187 /*
 188  * To avoid problems with clock jitter, rev 2 p4080 uses the pll from
 189  * bank 3 to clock banks 2 and 3, as well as a limited selection of
 190  * protocol configurations.  This requires that banks 2 and 3's lanes be
 191  * disabled in the RCW, and enabled with some fixup here to re-enable
 192  * them, and to configure bank 2's clock parameters in bank 3's pll in
 193  * cases where they differ.
 194  */
 195 static void p4080_erratum_serdes8(serdes_corenet_t *regs, ccsr_gur_t *gur,
 196                                   u32 devdisr, u32 devdisr2, int cfg)
 197 {
 198         int srds_ratio_b2;
 199         int rfck_sel;
 200
 201         /*
 202          * The disabled lanes of bank 2 will cause the associated
 203          * logic blocks to be disabled in DEVDISR.  We reverse that here.
 204          *
 205          * Note that normally it is not permitted to clear DEVDISR bits
 206          * once the device has been disabled, but the hardware people
 207          * say that this special case is OK.
 208          */
 209         clrbits_be32(&gur->devdisr, devdisr);
 210         clrbits_be32(&gur->devdisr2, devdisr2);
 211
 212         /*
 213          * Some protocols require special handling.  There are a few
 214          * additional protocol configurations that can be used, which are
 215          * not listed here.  See app note 4065 for supported protocol
 216          * configurations.
 217          */
 218         switch (cfg) {
 219         case 0x19:
 220                 /*
 221                  * Bank 2 has PCIe which wants BWSEL -- tell bank 3's PLL.
 222                  * SGMII on bank 3 should still be usable.
 223                  */
 224                 setbits_be32(&regs->bank[FSL_SRDS_BANK_3].pllcr1,
 225                              SRDS_PLLCR1_PLL_BWSEL);
 226
 227                 enable_bank(gur, FSL_SRDS_BANK_3);
 228                 break;
 229
 230         case 0x0f:
 231         case 0x10:
 232                 /*
 233                  * Banks 2 (XAUI) and 3 (SGMII) have different clocking
 234                  * requirements in these configurations.  Bank 3 cannot
 235                  * be used and should have its lanes (but not the bank
 236                  * itself) disabled in the RCW.  We set up bank 3's pll
 237                  * for bank 2's needs here.
 238                  */
 239                 srds_ratio_b2 = (in_be32(&gur->rcwsr[4]) >> 13) & 7;
 240
 241                 /* Determine refclock from XAUI ratio */
 242                 switch (srds_ratio_b2) {
 243                 case 1: /* 20:1 */
 244                         rfck_sel = SRDS_PLLCR0_RFCK_SEL_156_25;
 245                         break;
 246                 case 2: /* 25:1 */
 247                         rfck_sel = SRDS_PLLCR0_RFCK_SEL_125;
 248                         break;
 249                 default:
 250                         printf("SERDES: bad SRDS_RATIO_B2 %d\n",
 251                                srds_ratio_b2);
 252                         return;
 253                 }
 254
 255                 clrsetbits_be32(&regs->bank[FSL_SRDS_BANK_3].pllcr0,
 256                                 SRDS_PLLCR0_RFCK_SEL_MASK, rfck_sel);
 257
 258                 clrsetbits_be32(&regs->bank[FSL_SRDS_BANK_3].pllcr0,
 259                                 SRDS_PLLCR0_FRATE_SEL_MASK,
 260                                 SRDS_PLLCR0_FRATE_SEL_6_25);
 261                 break;
 262         default:
 263                 enable_bank(gur, FSL_SRDS_BANK_3);
 264         }
 265
 266 }
 267 #endif
 268
 269 void fsl_serdes_init(void)
 270 {
 271         ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
 272         int cfg;
 273         serdes_corenet_t *srds_regs;
 274         int lane, bank, idx;
 275         enum srds_prtcl lane_prtcl;
 276         long long end_tick;
 277         int have_bank[SRDS_MAX_BANK] = {};
 278 #ifdef CONFIG_SYS_P4080_ERRATUM_SERDES8
 279         u32 serdes8_devdisr = 0;
 280         u32 serdes8_devdisr2 = 0;
 281         char srds_lpd_opt[16];
 282         const char *srds_lpd_arg;
 283         size_t arglen;
 284 #endif
 285         char buffer[HWCONFIG_BUFFER_SIZE];
 286         char *buf = NULL;
 287
 288         /*
 289          * Extract hwconfig from environment since we have not properly setup
 290          * the environment but need it for ddr config params
 291          */
 292         if (getenv_f("hwconfig", buffer, sizeof(buffer)) > 0)
 293                 buf = buffer;
 294
 295         /* Is serdes enabled at all? */
 296         if (!(in_be32(&gur->rcwsr[5]) & FSL_CORENET_RCWSR5_SRDS_EN))
 297                 return;
 298
 299         srds_regs = (void *)(CONFIG_SYS_FSL_CORENET_SERDES_ADDR);
 300         cfg = (in_be32(&gur->rcwsr[4]) & FSL_CORENET_RCWSR4_SRDS_PRTCL) >> 26;
 301         debug("Using SERDES configuration 0x%x, lane settings:\n", cfg);
 302
 303         if (!is_serdes_prtcl_valid(cfg)) {
 304                 printf("SERDES[PRTCL] = 0x%x is not valid\n", cfg);
 305                 return;
 306         }
 307
 308 #ifdef CONFIG_SYS_P4080_ERRATUM_SERDES8
 309         /*
 310          * Store the values of the fsl_srds_lpd_b2 and fsl_srds_lpd_b3
 311          * hwconfig options into the srds_lpd_b[] array.  See README.p4080ds
 312          * for a description of these options.
 313          */
 314         for (bank = 1; bank < ARRAY_SIZE(srds_lpd_b); bank++) {
 315                 sprintf(srds_lpd_opt, "fsl_srds_lpd_b%u", bank + 1);
 316                 srds_lpd_arg =
 317                         hwconfig_subarg_f("serdes", srds_lpd_opt, &arglen, buf);
 318                 if (srds_lpd_arg)
 319                         srds_lpd_b[bank] =
 320                                 simple_strtoul(srds_lpd_arg, NULL, 0) & 0xf;
 321         }
 322 #endif
 323
 324         /* Look for banks with all lanes disabled, and power down the bank. */
 325         for (lane = 0; lane < SRDS_MAX_LANES; lane++) {
 326                 enum srds_prtcl lane_prtcl = serdes_get_prtcl(cfg, lane);
 327                 if (serdes_lane_enabled(lane)) {
 328                         have_bank[serdes_get_bank(lane)] = 1;
 329                         serdes_prtcl_map |= (1 << lane_prtcl);
 330                 }
 331         }
 332
 333 #ifdef CONFIG_SYS_P4080_ERRATUM_SERDES8
 334         /*
 335          * Bank two uses the clock from bank three, so if bank two is enabled,
 336          * then bank three must also be enabled.
 337          */
 338         if (have_bank[FSL_SRDS_BANK_2])
 339                 have_bank[FSL_SRDS_BANK_3] = 1;
 340 #endif
 341
 342         for (bank = 0; bank < SRDS_MAX_BANK; bank++) {
 343                 if (!have_bank[bank]) {
 344                         printf("SERDES: bank %d disabled\n", bank + 1);
 345                         setbits_be32(&srds_regs->bank[bank].rstctl,
 346                                      SRDS_RSTCTL_SDPD);
 347                 }
 348         }
 349
 350         for (lane = 0; lane < SRDS_MAX_LANES; lane++) {
 351                 idx = serdes_get_lane_idx(lane);
 352                 lane_prtcl = serdes_get_prtcl(cfg, lane);
 353
 354 #ifdef DEBUG
 355                 switch (lane) {
 356                 case 0:
 357                         puts("Bank1: ");
 358                         break;
 359                 case 10:
 360                         puts("\nBank2: ");
 361                         break;
 362                 case 14:
 363                         puts("\nBank3: ");
 364                         break;
 365                 default:
 366                         break;
 367                 }
 368
 369                 printf("%s ", serdes_prtcl_str[lane_prtcl]);
 370 #endif
 371
 372 #ifdef CONFIG_SYS_P4080_ERRATUM_SERDES8
 373                 switch (lane_prtcl) {
 374                 case PCIE1:
 375                 case PCIE2:
 376                 case PCIE3:
 377                         serdes8_devdisr |= FSL_CORENET_DEVDISR_PCIE1 >>
 378                                            (lane_prtcl - PCIE1);
 379                         break;
 380                 case SRIO1:
 381                 case SRIO2:
 382                         serdes8_devdisr |= FSL_CORENET_DEVDISR_SRIO1 >>
 383                                            (lane_prtcl - SRIO1);
 384                         break;
 385                 case SGMII_FM1_DTSEC1:
 386                         serdes8_devdisr2 |= FSL_CORENET_DEVDISR2_FM1 |
 387                                             FSL_CORENET_DEVDISR2_DTSEC1_1;
 388                         break;
 389                 case SGMII_FM1_DTSEC2:
 390                         serdes8_devdisr2 |= FSL_CORENET_DEVDISR2_FM1 |
 391                                             FSL_CORENET_DEVDISR2_DTSEC1_2;
 392                         break;
 393                 case SGMII_FM1_DTSEC3:
 394                         serdes8_devdisr2 |= FSL_CORENET_DEVDISR2_FM1 |
 395                                             FSL_CORENET_DEVDISR2_DTSEC1_3;
 396                         break;
 397                 case SGMII_FM1_DTSEC4:
 398                         serdes8_devdisr2 |= FSL_CORENET_DEVDISR2_FM1 |
 399                                             FSL_CORENET_DEVDISR2_DTSEC1_4;
 400                         break;
 401                 case SGMII_FM2_DTSEC1:
 402                         serdes8_devdisr2 |= FSL_CORENET_DEVDISR2_FM2 |
 403                                             FSL_CORENET_DEVDISR2_DTSEC2_1;
 404                         break;
 405                 case SGMII_FM2_DTSEC2:
 406                         serdes8_devdisr2 |= FSL_CORENET_DEVDISR2_FM2 |
 407                                             FSL_CORENET_DEVDISR2_DTSEC2_2;
 408                         break;
 409                 case SGMII_FM2_DTSEC3:
 410                         serdes8_devdisr2 |= FSL_CORENET_DEVDISR2_FM2 |
 411                                             FSL_CORENET_DEVDISR2_DTSEC2_3;
 412                         break;
 413                 case SGMII_FM2_DTSEC4:
 414                         serdes8_devdisr2 |= FSL_CORENET_DEVDISR2_FM2 |
 415                                             FSL_CORENET_DEVDISR2_DTSEC2_4;
 416                         break;
 417                 case XAUI_FM1:
 418                 case XAUI_FM2:
 419                         if (lane_prtcl == XAUI_FM1)
 420                                 serdes8_devdisr2 |= FSL_CORENET_DEVDISR2_FM1    |
 421                                                     FSL_CORENET_DEVDISR2_10GEC1;
 422                         else
 423                                 serdes8_devdisr2 |= FSL_CORENET_DEVDISR2_FM2    |
 424                                                     FSL_CORENET_DEVDISR2_10GEC2;
 425                         break;
 426                 case AURORA:
 427                         break;
 428                 default:
 429                         break;
 430                 }
 431
 432 #endif
 433         }
 434
 435 #ifdef DEBUG
 436         puts("\n");
 437 #endif
 438
 439         for (idx = 0; idx < SRDS_MAX_BANK; idx++) {
 440                 u32 rstctl;
 441
 442                 bank = idx;
 443
 444 #ifdef CONFIG_SYS_P4080_ERRATUM_SERDES8
 445                 /*
 446                  * Change bank init order to 0, 2, 1, so that the third bank's
 447                  * PLL is established before we start the second bank.  The
 448                  * second bank uses the third bank's PLL.
 449                  */
 450
 451                 if (idx == 1)
 452                         bank = FSL_SRDS_BANK_3;
 453                 else if (idx == 2)
 454                         bank = FSL_SRDS_BANK_2;
 455 #endif
 456
 457                 /* Skip disabled banks */
 458                 if (!have_bank[bank])
 459                         continue;
 460
 461 #ifdef CONFIG_SYS_P4080_ERRATUM_SERDES8
 462                 if (idx == 1) {
 463                         /*
 464                          * Re-enable devices on banks two and three that were
 465                          * disabled by the RCW, and then enable bank three. The
 466                          * devices need to be enabled before either bank is
 467                          * powered up.
 468                          */
 469                         p4080_erratum_serdes8(srds_regs, gur, serdes8_devdisr,
 470                                               serdes8_devdisr2, cfg);
 471                 } else if (idx == 2) {
 472                         /* Eable bank two now that bank three is enabled. */
 473                         enable_bank(gur, FSL_SRDS_BANK_2);
 474                 }
 475 #endif
 476
 477                 /* reset banks for errata */
 478                 setbits_be32(&srds_regs->bank[bank].rstctl, SRDS_RSTCTL_RST);
 479
 480                 /* wait for reset complete or 1-second timeout */
 481                 end_tick = usec2ticks(1000000) + get_ticks();
 482                 do {
 483                         rstctl = in_be32(&srds_regs->bank[bank].rstctl);
 484                         if (rstctl & SRDS_RSTCTL_RSTDONE)
 485                                 break;
 486                 } while (end_tick > get_ticks());
 487
 488                 if (!(rstctl & SRDS_RSTCTL_RSTDONE)) {
 489                         printf("SERDES: timeout resetting bank %d\n",
 490                                bank + 1);
 491                         continue;
 492                 }
 493         }
 494 }