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Subject[PATCH 4/6] ARM / shmobile: Support for I/O power domains for SH7372 (v5)
Date
From: Rafael J. Wysocki <rjw@sisk.pl>

Use the generic power domains support introduced by the previous
patch to implement support for power domains on SH7372.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
---
arch/arm/mach-shmobile/Kconfig | 1
arch/arm/mach-shmobile/Makefile | 4 +
arch/arm/mach-shmobile/board-mackerel.c | 3
arch/arm/mach-shmobile/include/mach/sh7372.h | 16 ++++
arch/arm/mach-shmobile/pm-sh7372.c | 97 +++++++++++++++++++++++++++
5 files changed, 121 insertions(+)

Index: linux-2.6/arch/arm/mach-shmobile/board-mackerel.c
===================================================================
--- linux-2.6.orig/arch/arm/mach-shmobile/board-mackerel.c
+++ linux-2.6/arch/arm/mach-shmobile/board-mackerel.c
@@ -1215,6 +1215,9 @@ static void __init mackerel_init(void)

platform_add_devices(mackerel_devices, ARRAY_SIZE(mackerel_devices));

+ sh7372_add_device_to_domain(SH7372_A4LC, &lcdc_device);
+ sh7372_add_device_to_domain(SH7372_A4LC, &hdmi_lcdc_device);
+
hdmi_init_pm_clock();
}

Index: linux-2.6/arch/arm/mach-shmobile/pm-sh7372.c
===================================================================
--- /dev/null
+++ linux-2.6/arch/arm/mach-shmobile/pm-sh7372.c
@@ -0,0 +1,97 @@
+/*
+ * arch/arm/mach-shmobile/pm-sh7372.c
+ *
+ * Power domains support code for SH7372
+ *
+ * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License v2. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/pm_runtime.h>
+#include <linux/platform_device.h>
+
+#include <mach/sh7372.h>
+
+struct sh7372_domain_data {
+ unsigned int bit_shift;
+};
+
+#define SPDCR 0xe6180008
+#define SWUCR 0xe6180014
+#define PSTR 0xe6180080
+
+static int pd_power_down(struct dev_power_domain *domain)
+{
+ struct sh7372_domain_data *dd = domain->platform_data;
+ unsigned int mask = 1 << dd->bit_shift;
+
+ if (__raw_readl(PSTR) & mask) {
+ __raw_writel(mask, SPDCR);
+
+ while (__raw_readl(SPDCR) & mask) {}
+
+ pr_debug("sh7372 power domain down 0x%08x -> PSTR = 0x%08x\n",
+ mask, __raw_readl(PSTR));
+ }
+
+ return 0;
+}
+
+static int pd_power_up(struct dev_power_domain *domain)
+{
+ struct sh7372_domain_data *dd = domain->platform_data;
+ unsigned int mask = 1 << dd->bit_shift;
+
+ if (!(__raw_readl(PSTR) & mask)) {
+ __raw_writel(mask, SWUCR);
+
+ while (__raw_readl(SWUCR) & mask) {}
+
+ pr_debug("sh7372 power domain up 0x%08x -> PSTR = 0x%08x\n",
+ mask, __raw_readl(PSTR));
+ }
+
+ return 0;
+}
+
+static void sh7372_init_domain(struct generic_power_domain *domain,
+ struct sh7372_domain_data *pdata)
+{
+ pm_genpd_init(domain, NULL, false);
+ domain->domain.platform_data = pdata;
+ domain->stop_device = pm_runtime_clk_suspend;
+ domain->start_device = pm_runtime_clk_resume;
+ domain->power_off = pd_power_down;
+ domain->power_on = pd_power_up;
+}
+
+void sh7372_add_device_to_domain(struct generic_power_domain *domain,
+ struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+
+ if (!dev->power.subsys_data) {
+ pm_runtime_clk_init(dev);
+ pm_runtime_clk_add(dev, NULL);
+ }
+ pm_genpd_add_device(domain, dev);
+}
+
+static struct sh7372_domain_data sh7372_a4lc_domain_data = {
+ .bit_shift = 1,
+};
+
+struct generic_power_domain sh7372_a4lc_domain;
+
+static int __init sh7372_power_domains_init(void)
+{
+ sh7372_init_domain(&sh7372_a4lc_domain, &sh7372_a4lc_domain_data);
+ return 0;
+}
+core_initcall(sh7372_power_domains_init);
Index: linux-2.6/arch/arm/mach-shmobile/include/mach/sh7372.h
===================================================================
--- linux-2.6.orig/arch/arm/mach-shmobile/include/mach/sh7372.h
+++ linux-2.6/arch/arm/mach-shmobile/include/mach/sh7372.h
@@ -12,6 +12,7 @@
#define __ASM_SH7372_H__

#include <linux/sh_clk.h>
+#include <linux/pm_domain.h>

/*
* Pin Function Controller:
@@ -469,4 +470,19 @@ extern struct clk sh7372_fsibck_clk;
extern struct clk sh7372_fsidiva_clk;
extern struct clk sh7372_fsidivb_clk;

+struct platform_device;
+
+#ifdef CONFIG_PM
+extern struct generic_power_domain sh7372_a4lc_domain;
+#define SH7372_A4LC (&sh7372_a4lc_domain)
+
+extern void sh7372_add_device_to_domain(struct generic_power_domain *domain,
+ struct platform_device *pdev);
+#else
+#define SH7372_A4LC NULL
+
+static inline void sh7372_add_device_to_domain(struct generic_power_domain *dom,
+ struct platform_device *pd) {}
+#endif /* CONFIG_PM */
+
#endif /* __ASM_SH7372_H__ */
Index: linux-2.6/arch/arm/mach-shmobile/Makefile
===================================================================
--- linux-2.6.orig/arch/arm/mach-shmobile/Makefile
+++ linux-2.6/arch/arm/mach-shmobile/Makefile
@@ -40,6 +40,10 @@ obj-$(CONFIG_MACH_AP4EVB) += board-ap4ev
obj-$(CONFIG_MACH_AG5EVM) += board-ag5evm.o
obj-$(CONFIG_MACH_MACKEREL) += board-mackerel.o

+# PM objects
+pm-$(CONFIG_ARCH_SH7372) += pm-sh7372.o
+
# Framework support
obj-$(CONFIG_SMP) += $(smp-y)
obj-$(CONFIG_GENERIC_GPIO) += $(pfc-y)
+obj-$(CONFIG_PM) += $(pm-y)
Index: linux-2.6/arch/arm/mach-shmobile/Kconfig
===================================================================
--- linux-2.6.orig/arch/arm/mach-shmobile/Kconfig
+++ linux-2.6/arch/arm/mach-shmobile/Kconfig
@@ -19,6 +19,7 @@ config ARCH_SH7372
select CPU_V7
select SH_CLK_CPG
select ARCH_WANT_OPTIONAL_GPIOLIB
+ select PM_GENERIC_DOMAINS

config ARCH_SH73A0
bool "SH-Mobile AG5 (R8A73A00)"


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