From b5a5b351979db29fd1aa33d8f31782d7f91731b0 Mon Sep 17 00:00:00 2001
From: Simon Glass
Date: Mon, 28 Nov 2011 15:04:38 +0000
Subject: tegra: Add a function mux feature

funcmux permits selection of config options for particular peripherals,
such as the pins that are used for that peripheral, if there are several
options.

Add UART selection to start with.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
---
 arch/arm/cpu/armv7/tegra2/Makefile  |  2 +-
 arch/arm/cpu/armv7/tegra2/funcmux.c | 58 +++++++++++++++++++++++++++++++++++++
 2 files changed, 59 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm/cpu/armv7/tegra2/funcmux.c

(limited to 'arch/arm/cpu')

diff --git a/arch/arm/cpu/armv7/tegra2/Makefile b/arch/arm/cpu/armv7/tegra2/Makefile
index 955c3b6dc41..f668a818fbf 100644
--- a/arch/arm/cpu/armv7/tegra2/Makefile
+++ b/arch/arm/cpu/armv7/tegra2/Makefile
@@ -33,7 +33,7 @@ include $(TOPDIR)/config.mk
 LIB	=  $(obj)lib$(SOC).o
 
 SOBJS	:= lowlevel_init.o
-COBJS	:= ap20.o board.o clock.o pinmux.o sys_info.o timer.o
+COBJS	:= ap20.o board.o clock.o funcmux.o pinmux.o sys_info.o timer.o
 
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS) $(SOBJS))
diff --git a/arch/arm/cpu/armv7/tegra2/funcmux.c b/arch/arm/cpu/armv7/tegra2/funcmux.c
new file mode 100644
index 00000000000..0878f511104
--- /dev/null
+++ b/arch/arm/cpu/armv7/tegra2/funcmux.c
@@ -0,0 +1,58 @@
+/*
+ * 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);
+		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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