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/*
* Copyright (c) 2011 The Chromium OS Authors.
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
/* Tegra2 high-level function multiplexing */
#include <common.h>
#include <asm/arch/clock.h>
#include <asm/arch/pinmux.h>
int funcmux_select(enum periph_id id, int config)
{
if (config != 0) {
debug("%s: invalid config %d for periph_id %d", __func__,
config, id);
return -1;
}
switch (id) {
case PERIPH_ID_UART1:
pinmux_set_func(PINGRP_IRRX, PMUX_FUNC_UARTA);
pinmux_set_func(PINGRP_IRTX, PMUX_FUNC_UARTA);
pinmux_tristate_disable(PINGRP_IRRX);
pinmux_tristate_disable(PINGRP_IRTX);
/*
* Tegra appears to boot with function UARTA pre-selected on
* mux group SDB. If two mux groups are both set to the same
* function, it's unclear which group's pins drive the RX
* signals into the HW module. For UARTA, SDB certainly
* overrides group IRTX in practice. To solve this, configure
* some alternative function on SDB to avoid the conflict. Also,
* tri-state the group to avoid driving any signal onto it until
* we know what's connected.
*/
pinmux_tristate_enable(PINGRP_SDB);
pinmux_set_func(PINGRP_SDB, PMUX_FUNC_SDIO3);
break;
case PERIPH_ID_UART2:
pinmux_set_func(PINGRP_UAD, PMUX_FUNC_IRDA);
pinmux_tristate_disable(PINGRP_UAD);
break;
case PERIPH_ID_UART4:
pinmux_set_func(PINGRP_GMC, PMUX_FUNC_UARTD);
pinmux_tristate_disable(PINGRP_GMC);
break;
default:
debug("%s: invalid periph_id %d", __func__, id);
return -1;
}
return 0;
}
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