tegra2: Add power control functions

WIP: needs clean-up

BUG=chromium-os:13228
TEST=Build, boot on Seaboard

Change-Id: I901015da144991e93a1f3d8d3c74011e755e0565
Reviewed-on: http://gerrit.chromium.org/gerrit/1291
Reviewed-by: Tom Warren <twarren@nvidia.com>
Tested-by: Simon Glass <sjg@chromium.org>

2 files changed, 55 insertions, 1 deletions

diff --git a/arch/arm/cpu/armv7/tegra2/Makefile b/arch/arm/cpu/armv7/tegra2/Makefile
index e23b8e87bf2..1be67d7f5e5 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 pwfm.o sys_info.o timer.o
+COBJS	:= ap20.o board.o clock.o pinmux.o power.o pwfm.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/power.c b/arch/arm/cpu/armv7/tegra2/power.c
new file mode 100644
index 00000000000..60821d4108f
--- /dev/null
+++ b/arch/arm/cpu/armv7/tegra2/power.c
@@ -0,0 +1,54 @@
+/*
+ * 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 power control functions */
+
+#include <asm/io.h>
+#include <asm/arch/bitfield.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/pmc.h>
+#include <asm/arch/power.h>
+#include <common.h>
+
+void power_enable_partition(enum power_partition_id id)
+{
+	struct pmc_ctlr *const pmc = (struct pmc_ctlr *)NV_PA_PMC_BASE;
+	enum power_partition_id clamp_id = id;
+
+	/* The order of these operations is important */
+	reset_set_enable(id, 1);
+
+	/* Turn the power gate on if it's not on already */
+	if (!(readl(&pmc->pmc_pwrgate_status) & (1 << id)))
+		writel(PWRGATE_ENABLE | id, &pmc->pmc_pwrgate_toggle);
+
+	clock_enable(id);
+	udelay(10);
+
+	/* The SOC switches these IDs for clamping */
+	if (clamp_id == POWERP_PCI)
+		clamp_id = POWERP_VIDEO_DEC;
+	else if (clamp_id == POWERP_VIDEO_DEC)
+		clamp_id = POWERP_PCI;
+	writel(1 << clamp_id, &pmc->pmc_remove_clamping);
+
+	reset_set_enable(id, 0);
+}