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 int funcmux_select(enum periph_id id, int config)
  29 {
  30         int bad_config = config != FUNCMUX_DEFAULT;
  31
  32         switch (id) {
  33         case PERIPH_ID_UART1:
  34                 switch (config) {
  35                 case FUNCMUX_UART1_IRRX_IRTX:
  36                         pinmux_set_func(PINGRP_IRRX, PMUX_FUNC_UARTA);
  37                         pinmux_set_func(PINGRP_IRTX, PMUX_FUNC_UARTA);
  38                         pinmux_tristate_disable(PINGRP_IRRX);
  39                         pinmux_tristate_disable(PINGRP_IRTX);
  40                         break;
  41                 case FUNCMUX_UART1_UAA_UAB:
  42                         pinmux_set_func(PINGRP_UAA, PMUX_FUNC_UARTA);
  43                         pinmux_set_func(PINGRP_UAB, PMUX_FUNC_UARTA);
  44                         pinmux_tristate_disable(PINGRP_UAA);
  45                         pinmux_tristate_disable(PINGRP_UAB);
  46                         bad_config = 0;
  47                         break;
  48                 case FUNCMUX_UART1_GPU:
  49                         pinmux_set_func(PINGRP_GPU, PMUX_FUNC_UARTA);
  50                         pinmux_tristate_disable(PINGRP_GPU);
  51                         bad_config = 0;
  52                         break;
  53                 case FUNCMUX_UART1_SDIO1:
  54                         pinmux_set_func(PINGRP_SDIO1, PMUX_FUNC_UARTA);
  55                         pinmux_tristate_disable(PINGRP_SDIO1);
  56                         bad_config = 0;
  57                         break;
  58                 }
  59                 if (!bad_config) {
  60                         /*
  61                          * Tegra appears to boot with function UARTA pre-
  62                          * selected on mux group SDB. If two mux groups are
  63                          * both set to the same function, it's unclear which
  64                          * group's pins drive the RX signals into the HW.
  65                          * For UARTA, SDB certainly overrides group IRTX in
  66                          * practice. To solve this, configure some alternative
  67                          * function on SDB to avoid the conflict. Also, tri-
  68                          * state the group to avoid driving any signal onto it
  69                          * until we know what's connected.
  70                          */
  71                         pinmux_tristate_enable(PINGRP_SDB);
  72                         pinmux_set_func(PINGRP_SDB,  PMUX_FUNC_SDIO3);
  73                 }
  74                 break;
  75
  76         case PERIPH_ID_UART2:
  77                 if (config == FUNCMUX_UART2_IRDA) {
  78                         pinmux_set_func(PINGRP_UAD, PMUX_FUNC_IRDA);
  79                         pinmux_tristate_disable(PINGRP_UAD);
  80                 }
  81                 break;
  82
  83         case PERIPH_ID_UART4:
  84                 if (config == FUNCMUX_UART4_GMC) {
  85                         pinmux_set_func(PINGRP_GMC, PMUX_FUNC_UARTD);
  86                         pinmux_tristate_disable(PINGRP_GMC);
  87                 }
  88                 break;
  89
  90         case PERIPH_ID_DVC_I2C:
  91                 /* there is only one selection, pinmux_config is ignored */
  92                 if (config == FUNCMUX_DVC_I2CP) {
  93                         pinmux_set_func(PINGRP_I2CP, PMUX_FUNC_I2C);
  94                         pinmux_tristate_disable(PINGRP_I2CP);
  95                 }
  96                 break;
  97
  98         case PERIPH_ID_I2C1:
  99                 /* support pinmux_config of 0 for now, */
 100                 if (config == FUNCMUX_I2C1_RM) {
 101                         pinmux_set_func(PINGRP_RM, PMUX_FUNC_I2C);
 102                         pinmux_tristate_disable(PINGRP_RM);
 103                 }
 104                 break;
 105         case PERIPH_ID_I2C2: /* I2C2 */
 106                 switch (config) {
 107                 case FUNCMUX_I2C2_DDC:  /* DDC pin group, select I2C2 */
 108                         pinmux_set_func(PINGRP_DDC, PMUX_FUNC_I2C2);
 109                         /* PTA to HDMI */
 110                         pinmux_set_func(PINGRP_PTA, PMUX_FUNC_HDMI);
 111                         pinmux_tristate_disable(PINGRP_DDC);
 112                         break;
 113                 case FUNCMUX_I2C2_PTA:  /* PTA pin group, select I2C2 */
 114                         pinmux_set_func(PINGRP_PTA, PMUX_FUNC_I2C2);
 115                         /* set DDC_SEL to RSVDx (RSVD2 works for now) */
 116                         pinmux_set_func(PINGRP_DDC, PMUX_FUNC_RSVD2);
 117                         pinmux_tristate_disable(PINGRP_PTA);
 118                         bad_config = 0;
 119                         break;
 120                 }
 121                 break;
 122         case PERIPH_ID_I2C3: /* I2C3 */
 123                 /* support pinmux_config of 0 for now */
 124                 if (config == FUNCMUX_I2C3_DTF) {
 125                         pinmux_set_func(PINGRP_DTF, PMUX_FUNC_I2C3);
 126                         pinmux_tristate_disable(PINGRP_DTF);
 127                 }
 128                 break;
 129
 130         case PERIPH_ID_SDMMC1:
 131                 if (config == FUNCMUX_SDMMC1_SDIO1_4BIT) {
 132                         pinmux_set_func(PINGRP_SDIO1, PMUX_FUNC_SDIO1);
 133                         pinmux_tristate_disable(PINGRP_SDIO1);
 134                 }
 135                 break;
 136
 137         case PERIPH_ID_SDMMC2:
 138                 if (config == FUNCMUX_SDMMC2_DTA_DTD_8BIT) {
 139                         pinmux_set_func(PINGRP_DTA, PMUX_FUNC_SDIO2);
 140                         pinmux_set_func(PINGRP_DTD, PMUX_FUNC_SDIO2);
 141
 142                         pinmux_tristate_disable(PINGRP_DTA);
 143                         pinmux_tristate_disable(PINGRP_DTD);
 144                 }
 145                 break;
 146
 147         case PERIPH_ID_SDMMC3:
 148                 switch (config) {
 149                 case FUNCMUX_SDMMC3_SDB_SLXA_8BIT:
 150                         pinmux_set_func(PINGRP_SLXA, PMUX_FUNC_SDIO3);
 151                         pinmux_set_func(PINGRP_SLXC, PMUX_FUNC_SDIO3);
 152                         pinmux_set_func(PINGRP_SLXD, PMUX_FUNC_SDIO3);
 153                         pinmux_set_func(PINGRP_SLXK, PMUX_FUNC_SDIO3);
 154
 155                         pinmux_tristate_disable(PINGRP_SLXA);
 156                         pinmux_tristate_disable(PINGRP_SLXC);
 157                         pinmux_tristate_disable(PINGRP_SLXD);
 158                         pinmux_tristate_disable(PINGRP_SLXK);
 159                         /* fall through */
 160
 161                 case FUNCMUX_SDMMC3_SDB_4BIT:
 162                         pinmux_set_func(PINGRP_SDB, PMUX_FUNC_SDIO3);
 163                         pinmux_set_func(PINGRP_SDC, PMUX_FUNC_SDIO3);
 164                         pinmux_set_func(PINGRP_SDD, PMUX_FUNC_SDIO3);
 165
 166                         pinmux_tristate_disable(PINGRP_SDB);
 167                         pinmux_tristate_disable(PINGRP_SDC);
 168                         pinmux_tristate_disable(PINGRP_SDD);
 169                         bad_config = 0;
 170                         break;
 171                 }
 172                 break;
 173
 174         case PERIPH_ID_SDMMC4:
 175                 switch (config) {
 176                 case FUNCMUX_SDMMC4_ATC_ATD_8BIT:
 177                         pinmux_set_func(PINGRP_ATC, PMUX_FUNC_SDIO4);
 178                         pinmux_set_func(PINGRP_ATD, PMUX_FUNC_SDIO4);
 179
 180                         pinmux_tristate_disable(PINGRP_ATC);
 181                         pinmux_tristate_disable(PINGRP_ATD);
 182                         break;
 183
 184                 case FUNCMUX_SDMMC4_ATB_GMA_GME_8_BIT:
 185                         pinmux_set_func(PINGRP_GME, PMUX_FUNC_SDIO4);
 186                         pinmux_tristate_disable(PINGRP_GME);
 187                         /* fall through */
 188
 189                 case FUNCMUX_SDMMC4_ATB_GMA_4_BIT:
 190                         pinmux_set_func(PINGRP_ATB, PMUX_FUNC_SDIO4);
 191                         pinmux_set_func(PINGRP_GMA, PMUX_FUNC_SDIO4);
 192
 193                         pinmux_tristate_disable(PINGRP_ATB);
 194                         pinmux_tristate_disable(PINGRP_GMA);
 195                         bad_config = 0;
 196                         break;
 197                 }
 198                 break;
 199
 200         case PERIPH_ID_KBC:
 201                 if (config == FUNCMUX_DEFAULT) {
 202                         enum pmux_pingrp grp[] = {PINGRP_KBCA, PINGRP_KBCB,
 203                                 PINGRP_KBCC, PINGRP_KBCD, PINGRP_KBCE,
 204                                 PINGRP_KBCF};
 205                         int i;
 206
 207                         for (i = 0; i < ARRAY_SIZE(grp); i++) {
 208                                 pinmux_tristate_disable(grp[i]);
 209                                 pinmux_set_func(grp[i], PMUX_FUNC_KBC);
 210                                 pinmux_set_pullupdown(grp[i], PMUX_PULL_UP);
 211                         }
 212                 }
 213                 break;
 214
 215         case PERIPH_ID_USB2:
 216                 if (config == FUNCMUX_USB2_ULPI) {
 217                         pinmux_set_func(PINGRP_UAA, PMUX_FUNC_ULPI);
 218                         pinmux_set_func(PINGRP_UAB, PMUX_FUNC_ULPI);
 219                         pinmux_set_func(PINGRP_UDA, PMUX_FUNC_ULPI);
 220
 221                         pinmux_tristate_disable(PINGRP_UAA);
 222                         pinmux_tristate_disable(PINGRP_UAB);
 223                         pinmux_tristate_disable(PINGRP_UDA);
 224                 }
 225                 break;
 226
 227         case PERIPH_ID_SPI1:
 228                 if (config == FUNCMUX_SPI1_GMC_GMD) {
 229                         pinmux_set_func(PINGRP_GMC, PMUX_FUNC_SFLASH);
 230                         pinmux_set_func(PINGRP_GMD, PMUX_FUNC_SFLASH);
 231
 232                         pinmux_tristate_disable(PINGRP_GMC);
 233                         pinmux_tristate_disable(PINGRP_GMD);
 234                 }
 235                 break;
 236
 237         case PERIPH_ID_NDFLASH:
 238                 if (config == FUNCMUX_NDFLASH_ATC) {
 239                         pinmux_set_func(PINGRP_ATC, PMUX_FUNC_NAND);
 240                         pinmux_tristate_disable(PINGRP_ATC);
 241                 }
 242                 break;
 243
 244         default:
 245                 debug("%s: invalid periph_id %d", __func__, id);
 246                 return -1;
 247         }
 248
 249         if (bad_config) {
 250                 debug("%s: invalid config %d for periph_id %d", __func__,
 251                       config, id);
 252                 return -1;
 253         }
 254
 255         return 0;
 256 }