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                 }
  49                 if (!bad_config) {
  50                         /*
  51                          * Tegra appears to boot with function UARTA pre-
  52                          * selected on mux group SDB. If two mux groups are
  53                          * both set to the same function, it's unclear which
  54                          * group's pins drive the RX signals into the HW.
  55                          * For UARTA, SDB certainly overrides group IRTX in
  56                          * practice. To solve this, configure some alternative
  57                          * function on SDB to avoid the conflict. Also, tri-
  58                          * state the group to avoid driving any signal onto it
  59                          * until we know what's connected.
  60                          */
  61                         pinmux_tristate_enable(PINGRP_SDB);
  62                         pinmux_set_func(PINGRP_SDB,  PMUX_FUNC_SDIO3);
  63                 }
  64                 break;
  65
  66         case PERIPH_ID_UART2:
  67                 if (config == FUNCMUX_UART2_IRDA) {
  68                         pinmux_set_func(PINGRP_UAD, PMUX_FUNC_IRDA);
  69                         pinmux_tristate_disable(PINGRP_UAD);
  70                 }
  71                 break;
  72
  73         case PERIPH_ID_UART4:
  74                 if (config == FUNCMUX_UART4_GMC) {
  75                         pinmux_set_func(PINGRP_GMC, PMUX_FUNC_UARTD);
  76                         pinmux_tristate_disable(PINGRP_GMC);
  77                 }
  78                 break;
  79
  80         case PERIPH_ID_DVC_I2C:
  81                 /* there is only one selection, pinmux_config is ignored */
  82                 if (config == FUNCMUX_DVC_I2CP) {
  83                         pinmux_set_func(PINGRP_I2CP, PMUX_FUNC_I2C);
  84                         pinmux_tristate_disable(PINGRP_I2CP);
  85                 }
  86                 break;
  87
  88         case PERIPH_ID_I2C1:
  89                 /* support pinmux_config of 0 for now, */
  90                 if (config == FUNCMUX_I2C1_RM) {
  91                         pinmux_set_func(PINGRP_RM, PMUX_FUNC_I2C);
  92                         pinmux_tristate_disable(PINGRP_RM);
  93                 }
  94                 break;
  95         case PERIPH_ID_I2C2: /* I2C2 */
  96                 switch (config) {
  97                 case FUNCMUX_I2C2_DDC:  /* DDC pin group, select I2C2 */
  98                         pinmux_set_func(PINGRP_DDC, PMUX_FUNC_I2C2);
  99                         /* PTA to HDMI */
 100                         pinmux_set_func(PINGRP_PTA, PMUX_FUNC_HDMI);
 101                         pinmux_tristate_disable(PINGRP_DDC);
 102                         break;
 103                 case FUNCMUX_I2C2_PTA:  /* PTA pin group, select I2C2 */
 104                         pinmux_set_func(PINGRP_PTA, PMUX_FUNC_I2C2);
 105                         /* set DDC_SEL to RSVDx (RSVD2 works for now) */
 106                         pinmux_set_func(PINGRP_DDC, PMUX_FUNC_RSVD2);
 107                         pinmux_tristate_disable(PINGRP_PTA);
 108                         bad_config = 0;
 109                         break;
 110                 }
 111                 break;
 112         case PERIPH_ID_I2C3: /* I2C3 */
 113                 /* support pinmux_config of 0 for now */
 114                 if (config == FUNCMUX_I2C3_DTF) {
 115                         pinmux_set_func(PINGRP_DTF, PMUX_FUNC_I2C3);
 116                         pinmux_tristate_disable(PINGRP_DTF);
 117                 }
 118                 break;
 119
 120         case PERIPH_ID_SDMMC2:
 121                 if (config == FUNCMUX_SDMMC2_DTA_DTD_8BIT) {
 122                         pinmux_set_func(PINGRP_DTA, PMUX_FUNC_SDIO2);
 123                         pinmux_set_func(PINGRP_DTD, PMUX_FUNC_SDIO2);
 124
 125                         pinmux_tristate_disable(PINGRP_DTA);
 126                         pinmux_tristate_disable(PINGRP_DTD);
 127                 }
 128                 break;
 129
 130         case PERIPH_ID_SDMMC3:
 131                 switch (config) {
 132                 case FUNCMUX_SDMMC3_SDB_SLXA_8BIT:
 133                         pinmux_set_func(PINGRP_SLXA, PMUX_FUNC_SDIO3);
 134                         pinmux_set_func(PINGRP_SLXC, PMUX_FUNC_SDIO3);
 135                         pinmux_set_func(PINGRP_SLXD, PMUX_FUNC_SDIO3);
 136                         pinmux_set_func(PINGRP_SLXK, PMUX_FUNC_SDIO3);
 137
 138                         pinmux_tristate_disable(PINGRP_SLXA);
 139                         pinmux_tristate_disable(PINGRP_SLXC);
 140                         pinmux_tristate_disable(PINGRP_SLXD);
 141                         pinmux_tristate_disable(PINGRP_SLXK);
 142                         /* fall through */
 143
 144                 case FUNCMUX_SDMMC3_SDB_4BIT:
 145                         pinmux_set_func(PINGRP_SDB, PMUX_FUNC_SDIO3);
 146                         pinmux_set_func(PINGRP_SDC, PMUX_FUNC_SDIO3);
 147                         pinmux_set_func(PINGRP_SDD, PMUX_FUNC_SDIO3);
 148
 149                         pinmux_tristate_disable(PINGRP_SDB);
 150                         pinmux_tristate_disable(PINGRP_SDC);
 151                         pinmux_tristate_disable(PINGRP_SDD);
 152                         bad_config = 0;
 153                         break;
 154                 }
 155                 break;
 156
 157         case PERIPH_ID_SDMMC4:
 158                 switch (config) {
 159                 case FUNCMUX_SDMMC4_ATC_ATD_8BIT:
 160                         pinmux_set_func(PINGRP_ATC, PMUX_FUNC_SDIO4);
 161                         pinmux_set_func(PINGRP_ATD, PMUX_FUNC_SDIO4);
 162
 163                         pinmux_tristate_disable(PINGRP_ATC);
 164                         pinmux_tristate_disable(PINGRP_ATD);
 165                         break;
 166
 167                 case FUNCMUX_SDMMC4_ATB_GMA_GME_8_BIT:
 168                         pinmux_set_func(PINGRP_GME, PMUX_FUNC_SDIO4);
 169                         pinmux_tristate_disable(PINGRP_GME);
 170                         /* fall through */
 171
 172                 case FUNCMUX_SDMMC4_ATB_GMA_4_BIT:
 173                         pinmux_set_func(PINGRP_ATB, PMUX_FUNC_SDIO4);
 174                         pinmux_set_func(PINGRP_GMA, PMUX_FUNC_SDIO4);
 175
 176                         pinmux_tristate_disable(PINGRP_ATB);
 177                         pinmux_tristate_disable(PINGRP_GMA);
 178                         bad_config = 0;
 179                         break;
 180                 }
 181                 break;
 182
 183         case PERIPH_ID_KBC:
 184                 if (config == FUNCMUX_DEFAULT) {
 185                         enum pmux_pingrp grp[] = {PINGRP_KBCA, PINGRP_KBCB,
 186                                 PINGRP_KBCC, PINGRP_KBCD, PINGRP_KBCE,
 187                                 PINGRP_KBCF};
 188                         int i;
 189
 190                         for (i = 0; i < ARRAY_SIZE(grp); i++) {
 191                                 pinmux_tristate_disable(grp[i]);
 192                                 pinmux_set_func(grp[i], PMUX_FUNC_KBC);
 193                                 pinmux_set_pullupdown(grp[i], PMUX_PULL_UP);
 194                         }
 195
 196                         break;
 197                 }
 198
 199         default:
 200                 debug("%s: invalid periph_id %d", __func__, id);
 201                 return -1;
 202         }
 203
 204         if (bad_config) {
 205                 debug("%s: invalid config %d for periph_id %d", __func__,
 206                       config, id);
 207                 return -1;
 208         }
 209
 210         return 0;
 211 }