Use the generic power domains support to implement support for power domain on EXYNOS4210.
I refer to the following patch to implement what configure the clock-gating control register for block to turn off/on: http://git.infradead.org/users/kmpark/linux-2.6-samsung/commit/39a81876d034dcbdc2a4c4c4b847b3b49e38870c Signed-off-by: Chanwoo Choi <[email protected]> Signed-off-by: Kyungmin Park <[email protected]> --- arch/arm/mach-exynos4/Kconfig | 1 + arch/arm/mach-exynos4/Makefile | 1 + arch/arm/mach-exynos4/include/mach/pm-exynos4210.h | 52 ++++++ arch/arm/mach-exynos4/include/mach/regs-clock.h | 8 + arch/arm/mach-exynos4/pm-exynos4210.c | 189 ++++++++++++++++++++ 5 files changed, 251 insertions(+), 0 deletions(-) create mode 100644 arch/arm/mach-exynos4/include/mach/pm-exynos4210.h create mode 100644 arch/arm/mach-exynos4/pm-exynos4210.c diff --git a/arch/arm/mach-exynos4/Kconfig b/arch/arm/mach-exynos4/Kconfig index 64baca7..8d5e876 100644 --- a/arch/arm/mach-exynos4/Kconfig +++ b/arch/arm/mach-exynos4/Kconfig @@ -12,6 +12,7 @@ if ARCH_EXYNOS4 config CPU_EXYNOS4210 bool select S3C_PL330_DMA + select PM_GENERIC_DOMAINS if PM help Enable EXYNOS4210 CPU support diff --git a/arch/arm/mach-exynos4/Makefile b/arch/arm/mach-exynos4/Makefile index b7fe1d7..97c31ce 100644 --- a/arch/arm/mach-exynos4/Makefile +++ b/arch/arm/mach-exynos4/Makefile @@ -16,6 +16,7 @@ obj-$(CONFIG_CPU_EXYNOS4210) += cpu.o init.o clock.o irq-combiner.o obj-$(CONFIG_CPU_EXYNOS4210) += setup-i2c0.o irq-eint.o dma.o pmu.o obj-$(CONFIG_PM) += pm.o sleep.o obj-$(CONFIG_CPU_IDLE) += cpuidle.o +obj-$(CONFIG_CPU_EXYNOS4210) += pm-exynos4210.o obj-$(CONFIG_SMP) += platsmp.o headsmp.o diff --git a/arch/arm/mach-exynos4/include/mach/pm-exynos4210.h b/arch/arm/mach-exynos4/include/mach/pm-exynos4210.h new file mode 100644 index 0000000..e36425a --- /dev/null +++ b/arch/arm/mach-exynos4/include/mach/pm-exynos4210.h @@ -0,0 +1,52 @@ +/* linux/arch/arm/mach-exynos4/include/mach/pm-exynos4210.h + * + * Exynos4210 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_EXYNOS4210_H +#define PM_EXYNOS4210_H + +#include <linux/pm_domain.h> + +struct platform_device; + +struct exynos4210_pm_domain { + struct generic_pm_domain genpd; + + const char *name; + void __iomem *base; + u32 clkgate_mask; + int boot_on; +}; + +static inline struct exynos4210_pm_domain *to_exynos4210_pd( + struct generic_pm_domain *pd) +{ + return container_of(pd, struct exynos4210_pm_domain, genpd); +} + +#ifdef CONFIG_PM +extern struct exynos4210_pm_domain exynos4210_pd_mfc; +extern struct exynos4210_pm_domain exynos4210_pd_g3d; +extern struct exynos4210_pm_domain exynos4210_pd_lcd0; +extern struct exynos4210_pm_domain exynos4210_pd_lcd1; +extern struct exynos4210_pm_domain exynos4210_pd_tv; +extern struct exynos4210_pm_domain exynos4210_pd_cam; +extern struct exynos4210_pm_domain exynos4210_pd_gps; + +extern void exynos4210_init_pm_domain(struct exynos4210_pm_domain *exynos4210_pd); +extern void exynos4210_add_device_to_domain(struct exynos4210_pm_domain *exynos4210_pd, + struct platform_device *pdev); +#else +#define exynos4210_init_pm_domain(pd) do { } while(0) +#define exynos4210_add_device_to_domain(pd, pdev) do { } while(0) +#endif /* CONFIG_PM */ + +#endif /* PM_EXYNOS4210_H */ diff --git a/arch/arm/mach-exynos4/include/mach/regs-clock.h b/arch/arm/mach-exynos4/include/mach/regs-clock.h index d493fdb..0d1c9ec 100644 --- a/arch/arm/mach-exynos4/include/mach/regs-clock.h +++ b/arch/arm/mach-exynos4/include/mach/regs-clock.h @@ -183,6 +183,14 @@ #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_LCD1 (1 << 5) +#define S5P_CLKGATE_BLOCK_GPS (1 << 7) + /* Compatibility defines and inclusion */ #include <mach/regs-pmu.h> diff --git a/arch/arm/mach-exynos4/pm-exynos4210.c b/arch/arm/mach-exynos4/pm-exynos4210.c new file mode 100644 index 0000000..d43c37f --- /dev/null +++ b/arch/arm/mach-exynos4/pm-exynos4210.c @@ -0,0 +1,189 @@ +/* linux/arch/arm/mach-exynos4/pm-exynos4210.c + * + * Exynos4210 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/pm.h> +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/slab.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-exynos4210.h> + +#ifdef CONFIG_PM +static DEFINE_SPINLOCK(clkgate_block_lock); + +static int pd_power_down(struct generic_pm_domain *genpd) +{ + struct exynos4210_pm_domain *exynos4210_pd = to_exynos4210_pd(genpd); + u32 timeout; + + /* Disable the power of power-domain */ + __raw_writel(0, exynos4210_pd->base); + + /* Wait max 1ms */ + timeout = 10; + while (__raw_readl(exynos4210_pd->base + 0x4) & S5P_INT_LOCAL_PWR_EN) { + if (timeout == 0) { + printk(KERN_ERR "Power domain %s disable failed.\n", + exynos4210_pd->name); + return -ETIMEDOUT; + } + timeout--; + udelay(100); + } + + /* Configure the clock-gating control register for block to turn off */ + if (exynos4210_pd->clkgate_mask) { + unsigned long flags; + u32 reg; + + spin_lock_irqsave(&clkgate_block_lock, flags); + reg = __raw_readl(S5P_CLKGATE_BLOCK); + reg &= ~exynos4210_pd->clkgate_mask; + __raw_writel(reg, S5P_CLKGATE_BLOCK); + spin_unlock_irqrestore(&clkgate_block_lock, flags); + } + + return 0; +} + +static int pd_power_up(struct generic_pm_domain *genpd) +{ + struct exynos4210_pm_domain *exynos4210_pd = to_exynos4210_pd(genpd); + u32 timeout; + + /* Enable power domain */ + __raw_writel(S5P_INT_LOCAL_PWR_EN, exynos4210_pd->base); + + /* Wait max 1ms */ + timeout = 10; + while ((__raw_readl(exynos4210_pd->base + 0x4) & S5P_INT_LOCAL_PWR_EN) + != S5P_INT_LOCAL_PWR_EN) { + if (timeout == 0) { + printk(KERN_ERR "Power domain %s enable failed.\n", + exynos4210_pd->name); + return -ETIMEDOUT; + } + timeout--; + udelay(100); + } + + /* Configure the clock-gating control register for block to turn on */ + if (exynos4210_pd->clkgate_mask) { + unsigned long flags; + u32 reg; + + spin_lock_irqsave(&clkgate_block_lock, flags); + reg = __raw_readl(S5P_CLKGATE_BLOCK); + reg |= exynos4210_pd->clkgate_mask; + __raw_writel(reg, S5P_CLKGATE_BLOCK); + spin_unlock_irqrestore(&clkgate_block_lock, flags); + } + + return 0; +} + +static bool pd_active_wakeup(struct device *dev) +{ + return true; +} + +void exynos4210_init_pm_domain(struct exynos4210_pm_domain *exynos4210_pd) +{ + struct generic_pm_domain *genpd; + + if (!exynos4210_pd) + return; + + genpd = &exynos4210_pd->genpd; + + pm_genpd_init(genpd, NULL, false); + genpd->stop_device = pm_clk_suspend; + genpd->start_device = pm_clk_resume; + genpd->active_wakeup = pd_active_wakeup; + genpd->power_off = pd_power_down; + genpd->power_on = pd_power_up; + + if (exynos4210_pd->boot_on) + pd_power_up(&exynos4210_pd->genpd); +} + +void exynos4210_add_device_to_domain(struct exynos4210_pm_domain *exynos4210_pd, + struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + + if (!exynos4210_pd || !pdev) + return; + + if (!dev->power.subsys_data) { + pm_clk_init(dev); + pm_clk_add(dev, NULL); + } + pm_genpd_add_device(&exynos4210_pd->genpd, dev); +} + +struct exynos4210_pm_domain exynos4210_pd_mfc = { + .name = "PD_MFC", + .base = S5P_PMU_MFC_CONF, + .clkgate_mask = S5P_CLKGATE_BLOCK_MFC, + .boot_on = 0, +}; + +struct exynos4210_pm_domain exynos4210_pd_g3d = { + .name = "PD_G3D", + .base = S5P_PMU_G3D_CONF, + .clkgate_mask = S5P_CLKGATE_BLOCK_G3D, + .boot_on = 0, +}; + +struct exynos4210_pm_domain exynos4210_pd_lcd0 = { + .name = "PD_LCD0", + .base = S5P_PMU_LCD0_CONF, + .clkgate_mask = S5P_CLKGATE_BLOCK_LCD0, + .boot_on = 1, +}; + +struct exynos4210_pm_domain exynos4210_pd_lcd1 = { + .name = "PD_LCD1", + .base = S5P_PMU_LCD1_CONF, + .clkgate_mask = S5P_CLKGATE_BLOCK_LCD1, + .boot_on = 0, +}; + +struct exynos4210_pm_domain exynos4210_pd_tv = { + .name = "PD_TV", + .base = S5P_PMU_TV_CONF, + .clkgate_mask = S5P_CLKGATE_BLOCK_TV, + .boot_on = 0, +}; + +struct exynos4210_pm_domain exynos4210_pd_cam = { + .name = "PD_CAM", + .base = S5P_PMU_CAM_CONF, + .clkgate_mask = S5P_CLKGATE_BLOCK_CAM, + .boot_on = 0, +}; + +struct exynos4210_pm_domain exynos4210_pd_gps = { + .name = "PD_GPS", + .base = S5P_PMU_GPS_CONF, + .clkgate_mask = S5P_CLKGATE_BLOCK_GPS, + .boot_on = 0, +}; + +#endif /* CONFIG_PM */ -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
