arch/arm/cpu/armv7/tegra2/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 /* Tegra2 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                 }
  54                 if (!bad_config) {
  55                         /*
  56                          * Tegra appears to boot with function UARTA pre-
  57                          * selected on mux group SDB. If two mux groups are
  58                          * both set to the same function, it's unclear which
  59                          * group's pins drive the RX signals into the HW.
  60                          * For UARTA, SDB certainly overrides group IRTX in
  61                          * practice. To solve this, configure some alternative
  62                          * function on SDB to avoid the conflict. Also, tri-
  63                          * state the group to avoid driving any signal onto it
  64                          * until we know what's connected.
  65                          */
  66                         pinmux_tristate_enable(PINGRP_SDB);
  67                         pinmux_set_func(PINGRP_SDB,  PMUX_FUNC_SDIO3);
  68                 }
  69                 break;
  70
  71         case PERIPH_ID_UART2:
  72                 if (config == FUNCMUX_UART2_IRDA) {
  73                         pinmux_set_func(PINGRP_UAD, PMUX_FUNC_IRDA);
  74                         pinmux_tristate_disable(PINGRP_UAD);
  75                 }
  76                 break;
  77
  78         case PERIPH_ID_UART4:
  79                 if (config == FUNCMUX_UART4_GMC) {
  80                         pinmux_set_func(PINGRP_GMC, PMUX_FUNC_UARTD);
  81                         pinmux_tristate_disable(PINGRP_GMC);
  82                 }
  83                 break;
  84
  85         case PERIPH_ID_DVC_I2C:
  86                 /* there is only one selection, pinmux_config is ignored */
  87                 if (config == FUNCMUX_DVC_I2CP) {
  88                         pinmux_set_func(PINGRP_I2CP, PMUX_FUNC_I2C);
  89                         pinmux_tristate_disable(PINGRP_I2CP);
  90                 }
  91                 break;
  92
  93         case PERIPH_ID_I2C1:
  94                 /* support pinmux_config of 0 for now, */
  95                 if (config == FUNCMUX_I2C1_RM) {
  96                         pinmux_set_func(PINGRP_RM, PMUX_FUNC_I2C);
  97                         pinmux_tristate_disable(PINGRP_RM);
  98                 }
  99                 break;
 100         case PERIPH_ID_I2C2: /* I2C2 */
 101                 switch (config) {
 102                 case FUNCMUX_I2C2_DDC:  /* DDC pin group, select I2C2 */
 103                         pinmux_set_func(PINGRP_DDC, PMUX_FUNC_I2C2);
 104                         /* PTA to HDMI */
 105                         pinmux_set_func(PINGRP_PTA, PMUX_FUNC_HDMI);
 106                         pinmux_tristate_disable(PINGRP_DDC);
 107                         break;
 108                 case FUNCMUX_I2C2_PTA:  /* PTA pin group, select I2C2 */
 109                         pinmux_set_func(PINGRP_PTA, PMUX_FUNC_I2C2);
 110                         /* set DDC_SEL to RSVDx (RSVD2 works for now) */
 111                         pinmux_set_func(PINGRP_DDC, PMUX_FUNC_RSVD2);
 112                         pinmux_tristate_disable(PINGRP_PTA);
 113                         bad_config = 0;
 114                         break;
 115                 }
 116                 break;
 117         case PERIPH_ID_I2C3: /* I2C3 */
 118                 /* support pinmux_config of 0 for now */
 119                 if (config == FUNCMUX_I2C3_DTF) {
 120                         pinmux_set_func(PINGRP_DTF, PMUX_FUNC_I2C3);
 121                         pinmux_tristate_disable(PINGRP_DTF);
 122                 }
 123                 break;
 124
 125         case PERIPH_ID_SDMMC2:
 126                 if (config == FUNCMUX_SDMMC2_DTA_DTD_8BIT) {
 127                         pinmux_set_func(PINGRP_DTA, PMUX_FUNC_SDIO2);
 128                         pinmux_set_func(PINGRP_DTD, PMUX_FUNC_SDIO2);
 129
 130                         pinmux_tristate_disable(PINGRP_DTA);
 131                         pinmux_tristate_disable(PINGRP_DTD);
 132                 }
 133                 break;
 134
 135         case PERIPH_ID_SDMMC3:
 136                 switch (config) {
 137                 case FUNCMUX_SDMMC3_SDB_SLXA_8BIT:
 138                         pinmux_set_func(PINGRP_SLXA, PMUX_FUNC_SDIO3);
 139                         pinmux_set_func(PINGRP_SLXC, PMUX_FUNC_SDIO3);
 140                         pinmux_set_func(PINGRP_SLXD, PMUX_FUNC_SDIO3);
 141                         pinmux_set_func(PINGRP_SLXK, PMUX_FUNC_SDIO3);
 142
 143                         pinmux_tristate_disable(PINGRP_SLXA);
 144                         pinmux_tristate_disable(PINGRP_SLXC);
 145                         pinmux_tristate_disable(PINGRP_SLXD);
 146                         pinmux_tristate_disable(PINGRP_SLXK);
 147                         /* fall through */
 148
 149                 case FUNCMUX_SDMMC3_SDB_4BIT:
 150                         pinmux_set_func(PINGRP_SDB, PMUX_FUNC_SDIO3);
 151                         pinmux_set_func(PINGRP_SDC, PMUX_FUNC_SDIO3);
 152                         pinmux_set_func(PINGRP_SDD, PMUX_FUNC_SDIO3);
 153
 154                         pinmux_tristate_disable(PINGRP_SDB);
 155                         pinmux_tristate_disable(PINGRP_SDC);
 156                         pinmux_tristate_disable(PINGRP_SDD);
 157                         bad_config = 0;
 158                         break;
 159                 }
 160                 break;
 161
 162         case PERIPH_ID_SDMMC4:
 163                 switch (config) {
 164                 case FUNCMUX_SDMMC4_ATC_ATD_8BIT:
 165                         pinmux_set_func(PINGRP_ATC, PMUX_FUNC_SDIO4);
 166                         pinmux_set_func(PINGRP_ATD, PMUX_FUNC_SDIO4);
 167
 168                         pinmux_tristate_disable(PINGRP_ATC);
 169                         pinmux_tristate_disable(PINGRP_ATD);
 170                         break;
 171
 172                 case FUNCMUX_SDMMC4_ATB_GMA_GME_8_BIT:
 173                         pinmux_set_func(PINGRP_GME, PMUX_FUNC_SDIO4);
 174                         pinmux_tristate_disable(PINGRP_GME);
 175                         /* fall through */
 176
 177                 case FUNCMUX_SDMMC4_ATB_GMA_4_BIT:
 178                         pinmux_set_func(PINGRP_ATB, PMUX_FUNC_SDIO4);
 179                         pinmux_set_func(PINGRP_GMA, PMUX_FUNC_SDIO4);
 180
 181                         pinmux_tristate_disable(PINGRP_ATB);
 182                         pinmux_tristate_disable(PINGRP_GMA);
 183                         bad_config = 0;
 184                         break;
 185                 }
 186                 break;
 187
 188         case PERIPH_ID_KBC:
 189                 if (config == FUNCMUX_DEFAULT) {
 190                         enum pmux_pingrp grp[] = {PINGRP_KBCA, PINGRP_KBCB,
 191                                 PINGRP_KBCC, PINGRP_KBCD, PINGRP_KBCE,
 192                                 PINGRP_KBCF};
 193                         int i;
 194
 195                         for (i = 0; i < ARRAY_SIZE(grp); i++) {
 196                                 pinmux_tristate_disable(grp[i]);
 197                                 pinmux_set_func(grp[i], PMUX_FUNC_KBC);
 198                                 pinmux_set_pullupdown(grp[i], PMUX_PULL_UP);
 199                         }
 200
 201                         break;
 202                 }
 203
 204         default:
 205                 debug("%s: invalid periph_id %d", __func__, id);
 206                 return -1;
 207         }
 208
 209         if (bad_config) {
 210                 debug("%s: invalid config %d for periph_id %d", __func__,
 211                       config, id);
 212                 return -1;
 213         }
 214
 215         return 0;
 216 }