2 * Copyright (c) 2011 The Chromium OS Authors.
3 * See file CREDITS for list of people who contributed to this
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.
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.
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,
22 /* Tegra2 high-level function multiplexing */
24 #include <asm/arch/clock.h>
25 #include <asm/arch/pinmux.h>
27 int funcmux_select(enum periph_id id, int config)
30 debug("%s: invalid config %d for periph_id %d", __func__,
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);
41 * Tegra appears to boot with function UARTA pre-selected on
42 * mux group SDB. If two mux groups are both set to the same
43 * function, it's unclear which group's pins drive the RX
44 * signals into the HW module. For UARTA, SDB certainly
45 * overrides group IRTX in practice. To solve this, configure
46 * some alternative function on SDB to avoid the conflict. Also,
47 * tri-state the group to avoid driving any signal onto it until
48 * we know what's connected.
50 pinmux_tristate_enable(PINGRP_SDB);
51 pinmux_set_func(PINGRP_SDB, PMUX_FUNC_SDIO3);
55 pinmux_set_func(PINGRP_UAD, PMUX_FUNC_IRDA);
56 pinmux_tristate_disable(PINGRP_UAD);
60 pinmux_set_func(PINGRP_GMC, PMUX_FUNC_UARTD);
61 pinmux_tristate_disable(PINGRP_GMC);
65 debug("%s: invalid periph_id %d", __func__, id);