Simon Glass | b5a5b35 | 2011-11-28 15:04:38 +0000 | [diff] [blame] | 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> |
Simon Glass | 2faf186 | 2012-01-11 12:42:23 +0000 | [diff] [blame] | 25 | #include <asm/arch/funcmux.h> |
Simon Glass | b5a5b35 | 2011-11-28 15:04:38 +0000 | [diff] [blame] | 26 | #include <asm/arch/pinmux.h> |
| 27 | |
| 28 | int funcmux_select(enum periph_id id, int config) |
| 29 | { |
Simon Glass | 2faf186 | 2012-01-11 12:42:23 +0000 | [diff] [blame] | 30 | int bad_config = config != FUNCMUX_DEFAULT; |
Simon Glass | d693969 | 2012-01-11 12:42:22 +0000 | [diff] [blame] | 31 | |
Simon Glass | b5a5b35 | 2011-11-28 15:04:38 +0000 | [diff] [blame] | 32 | switch (id) { |
| 33 | case PERIPH_ID_UART1: |
Simon Glass | 2faf186 | 2012-01-11 12:42:23 +0000 | [diff] [blame] | 34 | if (config == FUNCMUX_UART1_IRRX_IRTX) { |
Simon Glass | d693969 | 2012-01-11 12:42:22 +0000 | [diff] [blame] | 35 | pinmux_set_func(PINGRP_IRRX, PMUX_FUNC_UARTA); |
| 36 | pinmux_set_func(PINGRP_IRTX, PMUX_FUNC_UARTA); |
| 37 | pinmux_tristate_disable(PINGRP_IRRX); |
| 38 | pinmux_tristate_disable(PINGRP_IRTX); |
| 39 | /* |
| 40 | * Tegra appears to boot with function UARTA pre- |
| 41 | * selected on mux group SDB. If two mux groups are |
| 42 | * both set to the same function, it's unclear which |
| 43 | * group's pins drive the RX signals into the HW. |
| 44 | * For UARTA, SDB certainly overrides group IRTX in |
| 45 | * practice. To solve this, configure some alternative |
| 46 | * function on SDB to avoid the conflict. Also, tri- |
| 47 | * state the group to avoid driving any signal onto it |
| 48 | * until we know what's connected. |
| 49 | */ |
| 50 | pinmux_tristate_enable(PINGRP_SDB); |
| 51 | pinmux_set_func(PINGRP_SDB, PMUX_FUNC_SDIO3); |
| 52 | } |
Simon Glass | b5a5b35 | 2011-11-28 15:04:38 +0000 | [diff] [blame] | 53 | break; |
| 54 | |
| 55 | case PERIPH_ID_UART2: |
Simon Glass | 2faf186 | 2012-01-11 12:42:23 +0000 | [diff] [blame] | 56 | if (config == FUNCMUX_UART2_IRDA) { |
Simon Glass | d693969 | 2012-01-11 12:42:22 +0000 | [diff] [blame] | 57 | pinmux_set_func(PINGRP_UAD, PMUX_FUNC_IRDA); |
| 58 | pinmux_tristate_disable(PINGRP_UAD); |
| 59 | } |
Simon Glass | b5a5b35 | 2011-11-28 15:04:38 +0000 | [diff] [blame] | 60 | break; |
| 61 | |
| 62 | case PERIPH_ID_UART4: |
Simon Glass | 2faf186 | 2012-01-11 12:42:23 +0000 | [diff] [blame] | 63 | if (config == FUNCMUX_UART4_GMC) { |
Simon Glass | d693969 | 2012-01-11 12:42:22 +0000 | [diff] [blame] | 64 | pinmux_set_func(PINGRP_GMC, PMUX_FUNC_UARTD); |
| 65 | pinmux_tristate_disable(PINGRP_GMC); |
| 66 | } |
Simon Glass | b5a5b35 | 2011-11-28 15:04:38 +0000 | [diff] [blame] | 67 | break; |
| 68 | |
Simon Glass | 8a1133c | 2012-01-11 12:42:24 +0000 | [diff] [blame^] | 69 | case PERIPH_ID_DVC_I2C: |
| 70 | /* there is only one selection, pinmux_config is ignored */ |
| 71 | if (config == FUNCMUX_DVC_I2CP) { |
| 72 | pinmux_set_func(PINGRP_I2CP, PMUX_FUNC_I2C); |
| 73 | pinmux_tristate_disable(PINGRP_I2CP); |
| 74 | } |
| 75 | break; |
| 76 | |
| 77 | case PERIPH_ID_I2C1: |
| 78 | /* support pinmux_config of 0 for now, */ |
| 79 | if (config == FUNCMUX_I2C1_RM) { |
| 80 | pinmux_set_func(PINGRP_RM, PMUX_FUNC_I2C); |
| 81 | pinmux_tristate_disable(PINGRP_RM); |
| 82 | } |
| 83 | break; |
| 84 | case PERIPH_ID_I2C2: /* I2C2 */ |
| 85 | switch (config) { |
| 86 | case FUNCMUX_I2C2_DDC: /* DDC pin group, select I2C2 */ |
| 87 | pinmux_set_func(PINGRP_DDC, PMUX_FUNC_I2C2); |
| 88 | /* PTA to HDMI */ |
| 89 | pinmux_set_func(PINGRP_PTA, PMUX_FUNC_HDMI); |
| 90 | pinmux_tristate_disable(PINGRP_DDC); |
| 91 | break; |
| 92 | case FUNCMUX_I2C2_PTA: /* PTA pin group, select I2C2 */ |
| 93 | pinmux_set_func(PINGRP_PTA, PMUX_FUNC_I2C2); |
| 94 | /* set DDC_SEL to RSVDx (RSVD2 works for now) */ |
| 95 | pinmux_set_func(PINGRP_DDC, PMUX_FUNC_RSVD2); |
| 96 | pinmux_tristate_disable(PINGRP_PTA); |
| 97 | bad_config = 0; |
| 98 | break; |
| 99 | } |
| 100 | break; |
| 101 | case PERIPH_ID_I2C3: /* I2C3 */ |
| 102 | /* support pinmux_config of 0 for now */ |
| 103 | if (config == FUNCMUX_I2C3_DTF) { |
| 104 | pinmux_set_func(PINGRP_DTF, PMUX_FUNC_I2C3); |
| 105 | pinmux_tristate_disable(PINGRP_DTF); |
| 106 | } |
| 107 | break; |
| 108 | |
Simon Glass | b5a5b35 | 2011-11-28 15:04:38 +0000 | [diff] [blame] | 109 | default: |
| 110 | debug("%s: invalid periph_id %d", __func__, id); |
| 111 | return -1; |
| 112 | } |
| 113 | |
Simon Glass | d693969 | 2012-01-11 12:42:22 +0000 | [diff] [blame] | 114 | if (bad_config) { |
| 115 | debug("%s: invalid config %d for periph_id %d", __func__, |
| 116 | config, id); |
| 117 | return -1; |
| 118 | } |
| 119 | |
Simon Glass | b5a5b35 | 2011-11-28 15:04:38 +0000 | [diff] [blame] | 120 | return 0; |
| 121 | } |