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2faf1863de
We want to give a name to each available funcmux config. For now we just use the pin group names (even through it is verbose) since there seems to be nothing better. Signed-off-by: Simon Glass <sjg@chromium.org> Signed-off-by: Tom Warren <twarren@nvidia.com>
81 lines
2.4 KiB
C
81 lines
2.4 KiB
C
/*
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* Copyright (c) 2011 The Chromium OS Authors.
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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/* Tegra2 high-level function multiplexing */
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#include <common.h>
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#include <asm/arch/clock.h>
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#include <asm/arch/funcmux.h>
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#include <asm/arch/pinmux.h>
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int funcmux_select(enum periph_id id, int config)
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{
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int bad_config = config != FUNCMUX_DEFAULT;
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switch (id) {
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case PERIPH_ID_UART1:
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if (config == FUNCMUX_UART1_IRRX_IRTX) {
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pinmux_set_func(PINGRP_IRRX, PMUX_FUNC_UARTA);
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pinmux_set_func(PINGRP_IRTX, PMUX_FUNC_UARTA);
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pinmux_tristate_disable(PINGRP_IRRX);
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pinmux_tristate_disable(PINGRP_IRTX);
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/*
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* Tegra appears to boot with function UARTA pre-
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* selected on mux group SDB. If two mux groups are
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* both set to the same function, it's unclear which
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* group's pins drive the RX signals into the HW.
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* For UARTA, SDB certainly overrides group IRTX in
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* practice. To solve this, configure some alternative
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* function on SDB to avoid the conflict. Also, tri-
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* state the group to avoid driving any signal onto it
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* until we know what's connected.
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*/
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pinmux_tristate_enable(PINGRP_SDB);
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pinmux_set_func(PINGRP_SDB, PMUX_FUNC_SDIO3);
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}
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break;
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case PERIPH_ID_UART2:
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if (config == FUNCMUX_UART2_IRDA) {
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pinmux_set_func(PINGRP_UAD, PMUX_FUNC_IRDA);
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pinmux_tristate_disable(PINGRP_UAD);
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}
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break;
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case PERIPH_ID_UART4:
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if (config == FUNCMUX_UART4_GMC) {
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pinmux_set_func(PINGRP_GMC, PMUX_FUNC_UARTD);
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pinmux_tristate_disable(PINGRP_GMC);
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}
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break;
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default:
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debug("%s: invalid periph_id %d", __func__, id);
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return -1;
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}
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if (bad_config) {
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debug("%s: invalid config %d for periph_id %d", __func__,
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config, id);
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return -1;
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}
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return 0;
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}
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