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/funcmux.h>
26 #include <asm/arch/pinmux.h>
28 int funcmux_select(enum periph_id id, int config)
30 int bad_config = config != FUNCMUX_DEFAULT;
34 if (config == FUNCMUX_UART1_IRRX_IRTX) {
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);
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.
50 pinmux_tristate_enable(PINGRP_SDB);
51 pinmux_set_func(PINGRP_SDB, PMUX_FUNC_SDIO3);
56 if (config == FUNCMUX_UART2_IRDA) {
57 pinmux_set_func(PINGRP_UAD, PMUX_FUNC_IRDA);
58 pinmux_tristate_disable(PINGRP_UAD);
63 if (config == FUNCMUX_UART4_GMC) {
64 pinmux_set_func(PINGRP_GMC, PMUX_FUNC_UARTD);
65 pinmux_tristate_disable(PINGRP_GMC);
70 debug("%s: invalid periph_id %d", __func__, id);
75 debug("%s: invalid config %d for periph_id %d", __func__,