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authorSimon Glass <sjg@chromium.org>2011-08-30 06:23:14 +0000
committerAlbert ARIBAUD <albert.u.boot@aribaud.net>2011-09-04 11:36:15 +0200
commit858bd095e1583f86af93ac1ae8f9e28aebbd0aa5 (patch)
treed148a54fa6161e7d13d7ee5518277e03ffbb5375 /arch/arm/cpu
parentb4ba2be8dc2711ad2219186e89b4e10648d52af9 (diff)
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Tegra2: Add additional pin multiplexing features
This adds an enum for each pin and some functions for changing the pin muxing setup. Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'arch/arm/cpu')
-rw-r--r--arch/arm/cpu/armv7/tegra2/Makefile2
-rw-r--r--arch/arm/cpu/armv7/tegra2/pinmux.c52
2 files changed, 53 insertions, 1 deletions
diff --git a/arch/arm/cpu/armv7/tegra2/Makefile b/arch/arm/cpu/armv7/tegra2/Makefile
index b35764c..f673f03 100644
--- a/arch/arm/cpu/armv7/tegra2/Makefile
+++ b/arch/arm/cpu/armv7/tegra2/Makefile
@@ -28,7 +28,7 @@ include $(TOPDIR)/config.mk
LIB = $(obj)lib$(SOC).o
SOBJS := lowlevel_init.o
-COBJS := ap20.o board.o clock.o sys_info.o timer.o
+COBJS := ap20.o board.o clock.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/pinmux.c b/arch/arm/cpu/armv7/tegra2/pinmux.c
new file mode 100644
index 0000000..5594ab8
--- /dev/null
+++ b/arch/arm/cpu/armv7/tegra2/pinmux.c
@@ -0,0 +1,52 @@
+/*
+ * 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 pin multiplexing functions */
+
+#include <asm/io.h>
+#include <asm/arch/tegra2.h>
+#include <asm/arch/pinmux.h>
+#include <common.h>
+
+
+void pinmux_set_tristate(enum pmux_pin pin, int enable)
+{
+ struct pmux_tri_ctlr *pmt = (struct pmux_tri_ctlr *)NV_PA_APB_MISC_BASE;
+ u32 *tri = &pmt->pmt_tri[TRISTATE_REG(pin)];
+ u32 reg;
+
+ reg = readl(tri);
+ if (enable)
+ reg |= TRISTATE_MASK(pin);
+ else
+ reg &= ~TRISTATE_MASK(pin);
+ writel(reg, tri);
+}
+
+void pinmux_tristate_enable(enum pmux_pin pin)
+{
+ pinmux_set_tristate(pin, 1);
+}
+
+void pinmux_tristate_disable(enum pmux_pin pin)
+{
+ pinmux_set_tristate(pin, 0);
+}