arch/arm/cpu/tegra20-common/funcmux.c

   1 /*
   2  * Copyright (c) 2011 The Chromium OS Authors.
   3  * See file CREDITS for list of people who contributed to this
   4  * project.
   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 as
   8  * published by the Free Software Foundation; either version 2 of
   9  * 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., 59 Temple Place, Suite 330, Boston,
  19  * MA 02111-1307 USA
  20  */
  21
  22 /* Tegra20 high-level function multiplexing */
  23 #include <common.h>
  24 #include <asm/arch/clock.h>
  25 #include <asm/arch/funcmux.h>
  26 #include <asm/arch/pinmux.h>
  27
  28 /*
  29  * The PINMUX macro is used to set up pinmux tables.
  30  */
  31 #define PINMUX(grp, mux, pupd, tri)                   \
  32         {PINGRP_##grp, PMUX_FUNC_##mux, PMUX_PULL_##pupd, PMUX_TRI_##tri}
  33
  34 static const struct pingroup_config disp1_default[] = {
  35         PINMUX(LDI,   DISPA,      NORMAL,    NORMAL),
  36         PINMUX(LHP0,  DISPA,      NORMAL,    NORMAL),
  37         PINMUX(LHP1,  DISPA,      NORMAL,    NORMAL),
  38         PINMUX(LHP2,  DISPA,      NORMAL,    NORMAL),
  39         PINMUX(LHS,   DISPA,      NORMAL,    NORMAL),
  40         PINMUX(LM0,   RSVD4,      NORMAL,    NORMAL),
  41         PINMUX(LPP,   DISPA,      NORMAL,    NORMAL),
  42         PINMUX(LPW0,  DISPA,      NORMAL,    NORMAL),
  43         PINMUX(LPW2,  DISPA,      NORMAL,    NORMAL),
  44         PINMUX(LSC0,  DISPA,      NORMAL,    NORMAL),
  45         PINMUX(LSPI,  DISPA,      NORMAL,    NORMAL),
  46         PINMUX(LVP1,  DISPA,      NORMAL,    NORMAL),
  47         PINMUX(LVS,   DISPA,      NORMAL,    NORMAL),
  48         PINMUX(SLXD,  SPDIF,      NORMAL,    NORMAL),
  49 };
  50
  51
  52 int funcmux_select(enum periph_id id, int config)
  53 {
  54         int bad_config = config != FUNCMUX_DEFAULT;
  55
  56         switch (id) {
  57         case PERIPH_ID_UART1:
  58                 switch (config) {
  59                 case FUNCMUX_UART1_IRRX_IRTX:
  60                         pinmux_set_func(PINGRP_IRRX, PMUX_FUNC_UARTA);
  61                         pinmux_set_func(PINGRP_IRTX, PMUX_FUNC_UARTA);
  62                         pinmux_tristate_disable(PINGRP_IRRX);
  63                         pinmux_tristate_disable(PINGRP_IRTX);
  64                         break;
  65                 case FUNCMUX_UART1_UAA_UAB:
  66                         pinmux_set_func(PINGRP_UAA, PMUX_FUNC_UARTA);
  67                         pinmux_set_func(PINGRP_UAB, PMUX_FUNC_UARTA);
  68                         pinmux_tristate_disable(PINGRP_UAA);
  69                         pinmux_tristate_disable(PINGRP_UAB);
  70                         bad_config = 0;
  71                         break;
  72                 case FUNCMUX_UART1_GPU:
  73                         pinmux_set_func(PINGRP_GPU, PMUX_FUNC_UARTA);
  74                         pinmux_tristate_disable(PINGRP_GPU);
  75                         bad_config = 0;
  76                         break;
  77                 case FUNCMUX_UART1_SDIO1:
  78                         pinmux_set_func(PINGRP_SDIO1, PMUX_FUNC_UARTA);
  79                         pinmux_tristate_disable(PINGRP_SDIO1);
  80                         bad_config = 0;
  81                         break;
  82                 }
  83                 if (!bad_config) {
  84                         /*
  85                          * Tegra appears to boot with function UARTA pre-
  86                          * selected on mux group SDB. If two mux groups are
  87                          * both set to the same function, it's unclear which
  88                          * group's pins drive the RX signals into the HW.
  89                          * For UARTA, SDB certainly overrides group IRTX in
  90                          * practice. To solve this, configure some alternative
  91                          * function on SDB to avoid the conflict. Also, tri-
  92                          * state the group to avoid driving any signal onto it
  93                          * until we know what's connected.
  94                          */
  95                         pinmux_tristate_enable(PINGRP_SDB);
  96                         pinmux_set_func(PINGRP_SDB,  PMUX_FUNC_SDIO3);
  97                 }
  98                 break;
  99
 100         case PERIPH_ID_UART2:
 101                 if (config == FUNCMUX_UART2_UAD) {
 102                         pinmux_set_func(PINGRP_UAD, PMUX_FUNC_UARTB);
 103                         pinmux_tristate_disable(PINGRP_UAD);
 104                 }
 105                 break;
 106
 107         case PERIPH_ID_UART4:
 108                 if (config == FUNCMUX_UART4_GMC) {
 109                         pinmux_set_func(PINGRP_GMC, PMUX_FUNC_UARTD);
 110                         pinmux_tristate_disable(PINGRP_GMC);
 111                 }
 112                 break;
 113
 114         case PERIPH_ID_DVC_I2C:
 115                 /* there is only one selection, pinmux_config is ignored */
 116                 if (config == FUNCMUX_DVC_I2CP) {
 117                         pinmux_set_func(PINGRP_I2CP, PMUX_FUNC_I2C);
 118                         pinmux_tristate_disable(PINGRP_I2CP);
 119                 }
 120                 break;
 121
 122         case PERIPH_ID_I2C1:
 123                 /* support pinmux_config of 0 for now, */
 124                 if (config == FUNCMUX_I2C1_RM) {
 125                         pinmux_set_func(PINGRP_RM, PMUX_FUNC_I2C);
 126                         pinmux_tristate_disable(PINGRP_RM);
 127                 }
 128                 break;
 129         case PERIPH_ID_I2C2: /* I2C2 */
 130                 switch (config) {
 131                 case FUNCMUX_I2C2_DDC:  /* DDC pin group, select I2C2 */
 132                         pinmux_set_func(PINGRP_DDC, PMUX_FUNC_I2C2);
 133                         /* PTA to HDMI */
 134                         pinmux_set_func(PINGRP_PTA, PMUX_FUNC_HDMI);
 135                         pinmux_tristate_disable(PINGRP_DDC);
 136                         break;
 137                 case FUNCMUX_I2C2_PTA:  /* PTA pin group, select I2C2 */
 138                         pinmux_set_func(PINGRP_PTA, PMUX_FUNC_I2C2);
 139                         /* set DDC_SEL to RSVDx (RSVD2 works for now) */
 140                         pinmux_set_func(PINGRP_DDC, PMUX_FUNC_RSVD2);
 141                         pinmux_tristate_disable(PINGRP_PTA);
 142                         bad_config = 0;
 143                         break;
 144                 }
 145                 break;
 146         case PERIPH_ID_I2C3: /* I2C3 */
 147                 /* support pinmux_config of 0 for now */
 148                 if (config == FUNCMUX_I2C3_DTF) {
 149                         pinmux_set_func(PINGRP_DTF, PMUX_FUNC_I2C3);
 150                         pinmux_tristate_disable(PINGRP_DTF);
 151                 }
 152                 break;
 153
 154         case PERIPH_ID_SDMMC1:
 155                 if (config == FUNCMUX_SDMMC1_SDIO1_4BIT) {
 156                         pinmux_set_func(PINGRP_SDIO1, PMUX_FUNC_SDIO1);
 157                         pinmux_tristate_disable(PINGRP_SDIO1);
 158                 }
 159                 break;
 160
 161         case PERIPH_ID_SDMMC2:
 162                 if (config == FUNCMUX_SDMMC2_DTA_DTD_8BIT) {
 163                         pinmux_set_func(PINGRP_DTA, PMUX_FUNC_SDIO2);
 164                         pinmux_set_func(PINGRP_DTD, PMUX_FUNC_SDIO2);
 165
 166                         pinmux_tristate_disable(PINGRP_DTA);
 167                         pinmux_tristate_disable(PINGRP_DTD);
 168                 }
 169                 break;
 170
 171         case PERIPH_ID_SDMMC3:
 172                 switch (config) {
 173                 case FUNCMUX_SDMMC3_SDB_SLXA_8BIT:
 174                         pinmux_set_func(PINGRP_SLXA, PMUX_FUNC_SDIO3);
 175                         pinmux_set_func(PINGRP_SLXC, PMUX_FUNC_SDIO3);
 176                         pinmux_set_func(PINGRP_SLXD, PMUX_FUNC_SDIO3);
 177                         pinmux_set_func(PINGRP_SLXK, PMUX_FUNC_SDIO3);
 178
 179                         pinmux_tristate_disable(PINGRP_SLXA);
 180                         pinmux_tristate_disable(PINGRP_SLXC);
 181                         pinmux_tristate_disable(PINGRP_SLXD);
 182                         pinmux_tristate_disable(PINGRP_SLXK);
 183                         /* fall through */
 184
 185                 case FUNCMUX_SDMMC3_SDB_4BIT:
 186                         pinmux_set_func(PINGRP_SDB, PMUX_FUNC_SDIO3);
 187                         pinmux_set_func(PINGRP_SDC, PMUX_FUNC_SDIO3);
 188                         pinmux_set_func(PINGRP_SDD, PMUX_FUNC_SDIO3);
 189
 190                         pinmux_tristate_disable(PINGRP_SDB);
 191                         pinmux_tristate_disable(PINGRP_SDC);
 192                         pinmux_tristate_disable(PINGRP_SDD);
 193                         bad_config = 0;
 194                         break;
 195                 }
 196                 break;
 197
 198         case PERIPH_ID_SDMMC4:
 199                 switch (config) {
 200                 case FUNCMUX_SDMMC4_ATC_ATD_8BIT:
 201                         pinmux_set_func(PINGRP_ATC, PMUX_FUNC_SDIO4);
 202                         pinmux_set_func(PINGRP_ATD, PMUX_FUNC_SDIO4);
 203
 204                         pinmux_tristate_disable(PINGRP_ATC);
 205                         pinmux_tristate_disable(PINGRP_ATD);
 206                         break;
 207
 208                 case FUNCMUX_SDMMC4_ATB_GMA_GME_8_BIT:
 209                         pinmux_set_func(PINGRP_GME, PMUX_FUNC_SDIO4);
 210                         pinmux_tristate_disable(PINGRP_GME);
 211                         /* fall through */
 212
 213                 case FUNCMUX_SDMMC4_ATB_GMA_4_BIT:
 214                         pinmux_set_func(PINGRP_ATB, PMUX_FUNC_SDIO4);
 215                         pinmux_set_func(PINGRP_GMA, PMUX_FUNC_SDIO4);
 216
 217                         pinmux_tristate_disable(PINGRP_ATB);
 218                         pinmux_tristate_disable(PINGRP_GMA);
 219                         bad_config = 0;
 220                         break;
 221                 }
 222                 break;
 223
 224         case PERIPH_ID_KBC:
 225                 if (config == FUNCMUX_DEFAULT) {
 226                         enum pmux_pingrp grp[] = {PINGRP_KBCA, PINGRP_KBCB,
 227                                 PINGRP_KBCC, PINGRP_KBCD, PINGRP_KBCE,
 228                                 PINGRP_KBCF};
 229                         int i;
 230
 231                         for (i = 0; i < ARRAY_SIZE(grp); i++) {
 232                                 pinmux_tristate_disable(grp[i]);
 233                                 pinmux_set_func(grp[i], PMUX_FUNC_KBC);
 234                                 pinmux_set_pullupdown(grp[i], PMUX_PULL_UP);
 235                         }
 236                 }
 237                 break;
 238
 239         case PERIPH_ID_USB2:
 240                 if (config == FUNCMUX_USB2_ULPI) {
 241                         pinmux_set_func(PINGRP_UAA, PMUX_FUNC_ULPI);
 242                         pinmux_set_func(PINGRP_UAB, PMUX_FUNC_ULPI);
 243                         pinmux_set_func(PINGRP_UDA, PMUX_FUNC_ULPI);
 244
 245                         pinmux_tristate_disable(PINGRP_UAA);
 246                         pinmux_tristate_disable(PINGRP_UAB);
 247                         pinmux_tristate_disable(PINGRP_UDA);
 248                 }
 249                 break;
 250
 251         case PERIPH_ID_SPI1:
 252                 if (config == FUNCMUX_SPI1_GMC_GMD) {
 253                         pinmux_set_func(PINGRP_GMC, PMUX_FUNC_SFLASH);
 254                         pinmux_set_func(PINGRP_GMD, PMUX_FUNC_SFLASH);
 255
 256                         pinmux_tristate_disable(PINGRP_GMC);
 257                         pinmux_tristate_disable(PINGRP_GMD);
 258                 }
 259                 break;
 260
 261         case PERIPH_ID_NDFLASH:
 262                 switch (config) {
 263                 case FUNCMUX_NDFLASH_ATC:
 264                         pinmux_set_func(PINGRP_ATC, PMUX_FUNC_NAND);
 265                         pinmux_tristate_disable(PINGRP_ATC);
 266                         break;
 267                 case FUNCMUX_NDFLASH_KBC_8_BIT:
 268                         pinmux_set_func(PINGRP_KBCA, PMUX_FUNC_NAND);
 269                         pinmux_set_func(PINGRP_KBCC, PMUX_FUNC_NAND);
 270                         pinmux_set_func(PINGRP_KBCD, PMUX_FUNC_NAND);
 271                         pinmux_set_func(PINGRP_KBCE, PMUX_FUNC_NAND);
 272                         pinmux_set_func(PINGRP_KBCF, PMUX_FUNC_NAND);
 273
 274                         pinmux_tristate_disable(PINGRP_KBCA);
 275                         pinmux_tristate_disable(PINGRP_KBCC);
 276                         pinmux_tristate_disable(PINGRP_KBCD);
 277                         pinmux_tristate_disable(PINGRP_KBCE);
 278                         pinmux_tristate_disable(PINGRP_KBCF);
 279
 280                         bad_config = 0;
 281                         break;
 282                 }
 283                 break;
 284         case PERIPH_ID_DISP1:
 285                 if (config == FUNCMUX_DEFAULT) {
 286                         int i;
 287
 288                         for (i = PINGRP_LD0; i <= PINGRP_LD17; i++) {
 289                                 pinmux_set_func(i, PMUX_FUNC_DISPA);
 290                                 pinmux_tristate_disable(i);
 291                                 pinmux_set_pullupdown(i, PMUX_PULL_NORMAL);
 292                         }
 293                         pinmux_config_table(disp1_default,
 294                                             ARRAY_SIZE(disp1_default));
 295                 }
 296                 break;
 297
 298         default:
 299                 debug("%s: invalid periph_id %d", __func__, id);
 300                 return -1;
 301         }
 302
 303         if (bad_config) {
 304                 debug("%s: invalid config %d for periph_id %d", __func__,
 305                       config, id);
 306                 return -1;
 307         }
 308
 309         return 0;
 310 }