Subject: [PATCH 1/3 v3] ARM: EXYNOS4: Support for generic I/O power domains on EXYNOS4210/4212

From: [email-masked] (Chanwoo Choi)
Date: Tue, 25 Oct 2011 19:35:27 +0900

This patch support the generic power domains to control power domain
of EXYNOS4.

Signed-off-by: Chanwoo Choi <[email-masked]>
Signed-off-by: Kyungmin Park <[email-masked]>
---
 arch/arm/mach-exynos4/Kconfig                   |    2 +
 arch/arm/mach-exynos4/Makefile                  |    1 +
 arch/arm/mach-exynos4/include/mach/pm-exynos4.h |   50 +++++
 arch/arm/mach-exynos4/include/mach/regs-clock.h |    9 +
 arch/arm/mach-exynos4/include/mach/regs-pmu.h   |    2 +
 arch/arm/mach-exynos4/pm-exynos4.c              |  237 +++++++++++++++++++++++
 6 files changed, 301 insertions(+), 0 deletions(-)
 create mode 100644 arch/arm/mach-exynos4/include/mach/pm-exynos4.h
 create mode 100644 arch/arm/mach-exynos4/pm-exynos4.c

diff --git a/arch/arm/mach-exynos4/Kconfig b/arch/arm/mach-exynos4/Kconfig
index 4924838..d042e53 100644
--- a/arch/arm/mach-exynos4/Kconfig
+++ b/arch/arm/mach-exynos4/Kconfig
@@ -14,6 +14,7 @@ config CPU_EXYNOS4210
 	select SAMSUNG_DMADEV
 	select S5P_PM if PM
 	select S5P_SLEEP if PM
+	select PM_GENERIC_DOMAINS if PM
 	help
 	  Enable EXYNOS4210 CPU support
 
@@ -21,6 +22,7 @@ config SOC_EXYNOS4212
 	bool
 	select S5P_PM if PM
 	select S5P_SLEEP if PM
+	select PM_GENERIC_DOMAINS if PM
 	help
 	  Enable EXYNOS4212 SoC support
 
diff --git a/arch/arm/mach-exynos4/Makefile b/arch/arm/mach-exynos4/Makefile
index 2bb18f4..d73a4e7 100644
--- a/arch/arm/mach-exynos4/Makefile
+++ b/arch/arm/mach-exynos4/Makefile
@@ -14,6 +14,7 @@ obj-				:=
 
 obj-$(CONFIG_ARCH_EXYNOS4)	+= cpu.o init.o clock.o irq-combiner.o
 obj-$(CONFIG_ARCH_EXYNOS4)	+= setup-i2c0.o irq-eint.o dma.o pmu.o
+obj-$(CONFIG_ARCH_EXYNOS4)	+= pm-exynos4.o
 obj-$(CONFIG_CPU_EXYNOS4210)	+= clock-exynos4210.o
 obj-$(CONFIG_SOC_EXYNOS4212)	+= clock-exynos4212.o
 obj-$(CONFIG_PM)		+= pm.o
diff --git a/arch/arm/mach-exynos4/include/mach/pm-exynos4.h b/arch/arm/mach-exynos4/include/mach/pm-exynos4.h
new file mode 100644
index 0000000..31f6b75
--- /dev/null
+++ b/arch/arm/mach-exynos4/include/mach/pm-exynos4.h
@@ -0,0 +1,50 @@
+/* linux/arch/arm/mach-exynos4/include/mach/pm-exynos4.h
+ *
+ * EXYNOS4 series Power management support
+ *
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef PM_EXYNOS4_H
+#define PM_EXYNOS4_H
+
+#include <linux/pm_domain.h>
+
+#ifdef CONFIG_PM
+struct exynos4_pm_domain {
+	struct generic_pm_domain genpd;
+	const char *name;
+	void __iomem *base;
+	u32 clkgate_mask;
+};
+
+extern int exynos4_add_device_to_domain(struct exynos4_pm_domain *exynos4_pd,
+				struct platform_device *pdev);
+extern void exynos4210_init_pm_domains(void);
+extern void exynos4x12_init_pm_domains(void);
+
+/* Common power domain for EXYNOS4 series */
+extern struct exynos4_pm_domain exynos4_pd_mfc;
+extern struct exynos4_pm_domain exynos4_pd_g3d;
+extern struct exynos4_pm_domain exynos4_pd_lcd0;
+extern struct exynos4_pm_domain exynos4_pd_tv;
+extern struct exynos4_pm_domain exynos4_pd_cam;
+extern struct exynos4_pm_domain exynos4_pd_gps;
+
+/* Only for EXYNOS4210 */
+extern struct exynos4_pm_domain exynos4_pd_lcd1;
+
+/* Only for EXYNOS4x12 */
+extern struct exynos4_pm_domain exynos4_pd_isp;
+
+#else
+#define exynos4_add_device_to_domain(exynos4_pd, pdev) { }
+#define exynos4210_init_pm_domains() { }
+#define exynos4x12_init_pm_domains() { }
+#endif	/* CONFIG_PM */
+#endif	/* PM_EXYNOS4_H */
diff --git a/arch/arm/mach-exynos4/include/mach/regs-clock.h b/arch/arm/mach-exynos4/include/mach/regs-clock.h
index 6c37ebe..c519ade 100644
--- a/arch/arm/mach-exynos4/include/mach/regs-clock.h
+++ b/arch/arm/mach-exynos4/include/mach/regs-clock.h
@@ -194,6 +194,13 @@
 #define S5P_CLKDIV_BUS_GPLR_SHIFT	(4)
 #define S5P_CLKDIV_BUS_GPLR_MASK	(0x7 << S5P_CLKDIV_BUS_GPLR_SHIFT)
 
+#define S5P_CLKGATE_BLOCK_CAM		(1 << 0)
+#define S5P_CLKGATE_BLOCK_TV		(1 << 1)
+#define S5P_CLKGATE_BLOCK_MFC		(1 << 2)
+#define S5P_CLKGATE_BLOCK_G3D		(1 << 3)
+#define S5P_CLKGATE_BLOCK_LCD0		(1 << 4)
+#define S5P_CLKGATE_BLOCK_GPS		(1 << 7)
+
 /* Only for EXYNOS4210 */
 
 #define S5P_CLKSRC_LCD1			S5P_CLKREG(0x0C238)
@@ -201,6 +208,8 @@
 #define S5P_CLKDIV_LCD1			S5P_CLKREG(0x0C538)
 #define S5P_CLKGATE_IP_LCD1		S5P_CLKREG(0x0C938)
 
+#define S5P_CLKGATE_BLOCK_LCD1		(1 << 5)
+
 /* Compatibility defines and inclusion */
 
 #include <mach/regs-pmu.h>
diff --git a/arch/arm/mach-exynos4/include/mach/regs-pmu.h b/arch/arm/mach-exynos4/include/mach/regs-pmu.h
index 4fff8e9..da397d5 100644
--- a/arch/arm/mach-exynos4/include/mach/regs-pmu.h
+++ b/arch/arm/mach-exynos4/include/mach/regs-pmu.h
@@ -217,4 +217,6 @@
 #define S5P_SECSS_MEM_OPTION			S5P_PMUREG(0x2EC8)
 #define S5P_ROTATOR_MEM_OPTION			S5P_PMUREG(0x2F48)
 
+#define S5P_PMU_ISP_CONF			S5P_PMUREG(0x3CA0)
+
 #endif /* __ASM_ARCH_REGS_PMU_H */
diff --git a/arch/arm/mach-exynos4/pm-exynos4.c b/arch/arm/mach-exynos4/pm-exynos4.c
new file mode 100644
index 0000000..c35952b
--- /dev/null
+++ b/arch/arm/mach-exynos4/pm-exynos4.c
@@ -0,0 +1,237 @@
+/* linux/arch/arm/mach-exynos4/pm-exynos4.c
+ *
+ * EXYNOS4 series Power management support
+ *
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/pm_runtime.h>
+#include <linux/platform_device.h>
+#include <linux/pm_domain.h>
+#include <linux/io.h>
+
+#include <mach/regs-clock.h>
+#include <mach/pm-exynos4.h>
+
+#ifdef CONFIG_PM
+/*
+ * Define function to support generic power domain
+ */
+
+static DEFINE_SPINLOCK(clkgate_block_lock);
+
+static struct exynos4_pm_domain *to_exynos4_pd(struct generic_pm_domain *pd)
+{
+	return container_of(pd, struct exynos4_pm_domain, genpd);
+}
+
+static int __exynos4_pd_power_down(struct generic_pm_domain *genpd)
+{
+	struct exynos4_pm_domain *exynos4_pd = to_exynos4_pd(genpd);
+	u32 timeout;
+
+	/* Disable the power of power-domain */
+	__raw_writel(0, exynos4_pd->base);
+
+	/* Wait max 1ms */
+	timeout = 10;
+	while (__raw_readl(exynos4_pd->base + 0x4) & S5P_INT_LOCAL_PWR_EN) {
+		if (timeout == 0) {
+			pr_err("Power domain %s disable failed.\n", exynos4_pd->name);
+			return -ETIMEDOUT;
+		}
+		timeout--;
+		usleep_range(90, 110);
+	}
+
+	/* Configure the clock-gating control register for block to turn off */
+	if (exynos4_pd->clkgate_mask) {
+		unsigned long flags;
+		u32 reg;
+
+		spin_lock_irqsave(&clkgate_block_lock, flags);
+		reg = __raw_readl(S5P_CLKGATE_BLOCK);
+		reg &= ~exynos4_pd->clkgate_mask;
+		__raw_writel(reg, S5P_CLKGATE_BLOCK);
+		spin_unlock_irqrestore(&clkgate_block_lock, flags);
+	}
+
+	return 0;
+}
+
+static int __exynos4_pd_power_up(struct generic_pm_domain *genpd)
+{
+	struct exynos4_pm_domain *exynos4_pd = to_exynos4_pd(genpd);
+	u32 timeout;
+
+	/* Enable power domain */
+	__raw_writel(S5P_INT_LOCAL_PWR_EN, exynos4_pd->base);
+
+	/* Wait max 1ms */
+	timeout = 10;
+	while ((__raw_readl(exynos4_pd->base + 0x4) & S5P_INT_LOCAL_PWR_EN)
+		!= S5P_INT_LOCAL_PWR_EN) {
+		if (timeout == 0) {
+			pr_err("Power domain %s enable failed.\n",
+				exynos4_pd->name);
+			return -ETIMEDOUT;
+		}
+		timeout--;
+		usleep_range(90, 110);
+	}
+
+	/* Configure the clock-gating control register for block to turn on */
+	if (exynos4_pd->clkgate_mask) {
+		unsigned long flags;
+		u32 reg;
+
+		spin_lock_irqsave(&clkgate_block_lock, flags);
+		reg = __raw_readl(S5P_CLKGATE_BLOCK);
+		reg |= exynos4_pd->clkgate_mask;
+		__raw_writel(reg, S5P_CLKGATE_BLOCK);
+		spin_unlock_irqrestore(&clkgate_block_lock, flags);
+	}
+
+	return 0;
+}
+
+static bool __exynos4_pd_active_wakeup(struct device *dev)
+{
+	return true;
+}
+
+static void __exynos4_init_pm_domain(struct exynos4_pm_domain *exynos4_pd)
+{
+	struct generic_pm_domain *genpd;
+
+	if (!exynos4_pd) {
+		pr_err("Failed to initialize Power domain(%s)\n", exynos4_pd->name);
+		return;
+	}
+
+	genpd = &exynos4_pd->genpd;
+
+	pm_genpd_init(genpd, NULL, false);
+	genpd->active_wakeup = __exynos4_pd_active_wakeup;
+	genpd->power_off = __exynos4_pd_power_down;
+	genpd->power_on = __exynos4_pd_power_up;
+}
+
+/*
+ * Define power domain of EXYNOS4 series
+ * - EXYNOS4210
+ * - EXYNOS4212
+ */
+/* Common power domain on EXYNOS4 series */
+struct exynos4_pm_domain exynos4_pd_mfc = {
+	.name		= "PD_MFC",
+	.base		= S5P_PMU_MFC_CONF,
+	.clkgate_mask	= S5P_CLKGATE_BLOCK_MFC,
+};
+
+struct exynos4_pm_domain exynos4_pd_g3d = {
+	.name		= "PD_G3D",
+	.base		= S5P_PMU_G3D_CONF,
+	.clkgate_mask	= S5P_CLKGATE_BLOCK_G3D,
+};
+
+struct exynos4_pm_domain exynos4_pd_lcd0 = {
+	.name		= "PD_LCD0",
+	.base		= S5P_PMU_LCD0_CONF,
+	.clkgate_mask	= S5P_CLKGATE_BLOCK_LCD0,
+};
+
+struct exynos4_pm_domain exynos4_pd_tv = {
+	.name		= "PD_TV",
+	.base		= S5P_PMU_TV_CONF,
+	.clkgate_mask	= S5P_CLKGATE_BLOCK_TV,
+};
+
+struct exynos4_pm_domain exynos4_pd_cam = {
+	.name		= "PD_CAM",
+	.base		= S5P_PMU_CAM_CONF,
+	.clkgate_mask	= S5P_CLKGATE_BLOCK_CAM,
+};
+
+struct exynos4_pm_domain exynos4_pd_gps = {
+	.name		= "PD_GPS",
+	.base		= S5P_PMU_GPS_CONF,
+	.clkgate_mask	= S5P_CLKGATE_BLOCK_GPS,
+};
+
+/* Only for EXYNOS4210 */
+struct exynos4_pm_domain exynos4_pd_lcd1 = {
+	.name		= "PD_LCD1",
+	.base		= S5P_PMU_LCD1_CONF,
+	.clkgate_mask	= S5P_CLKGATE_BLOCK_LCD1,
+};
+
+/* Only for EXYNOS4212 */
+struct exynos4_pm_domain exynos4_pd_isp = {
+	.name		= "PD_ISP",
+	.base		= S5P_PMU_ISP_CONF,
+};
+
+/*
+ * Define function which initalize power domain and add device to it
+ */
+int exynos4_add_device_to_domain(struct exynos4_pm_domain *exynos4_pd,
+				struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	int ret;
+
+	if (!exynos4_pd || !pdev)
+		return -EINVAL;
+
+	ret = pm_genpd_add_device(&exynos4_pd->genpd, dev);
+	if (ret < 0) {
+		pr_err("Failed to add %s device to power domain(%s)\n",
+			dev_name(&pdev->dev), exynos4_pd->name);
+		return ret;
+	}
+
+	pr_info("Add %s device to power domain(%s)\n",
+			dev_name(&pdev->dev), exynos4_pd->name);
+	return 0;
+}
+
+void exynos4_init_pm_domains(void)
+{
+	__exynos4_init_pm_domain(&exynos4_pd_mfc);
+	__exynos4_init_pm_domain(&exynos4_pd_g3d);
+	__exynos4_init_pm_domain(&exynos4_pd_lcd0);
+	__exynos4_init_pm_domain(&exynos4_pd_tv);
+	__exynos4_init_pm_domain(&exynos4_pd_cam);
+	__exynos4_init_pm_domain(&exynos4_pd_gps);
+
+}
+
+/* Initialize EXYNOS4210 power domain */
+void exynos4210_init_pm_domains(void)
+{
+	exynos4_init_pm_domains();
+
+	__exynos4_init_pm_domain(&exynos4_pd_lcd1);
+
+	/* Enabled the power domain of LCD0 */
+	__exynos4_pd_power_up(&exynos4_pd_lcd0.genpd);
+}
+
+/* Initialize EXYNOS4x12 power domain */
+void exynos4x12_init_pm_domains(void)
+{
+	exynos4_init_pm_domains();
+
+	__exynos4_init_pm_domain(&exynos4_pd_isp);
+
+	/* Enabled the power domain of LCD0 */
+	__exynos4_pd_power_up(&exynos4_pd_lcd0.genpd);
+}
+#endif	/* CONFIG_PM */
-- 
1.7.0.4