mirror of https://gitee.com/openkylin/linux.git
206 lines
5.2 KiB
C
206 lines
5.2 KiB
C
/*
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* Exynos Generic power domain support.
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*
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* Copyright (c) 2012 Samsung Electronics Co., Ltd.
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* http://www.samsung.com
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*
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* Implementation of Exynos specific power domain control which is used in
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* conjunction with runtime-pm. Support for both device-tree and non-device-tree
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* based power domain support is included.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/io.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/pm_domain.h>
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#include <linux/delay.h>
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#include <linux/of_address.h>
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#include <mach/regs-pmu.h>
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#include <plat/devs.h>
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/*
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* Exynos specific wrapper around the generic power domain
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*/
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struct exynos_pm_domain {
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void __iomem *base;
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char const *name;
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bool is_off;
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struct generic_pm_domain pd;
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};
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static int exynos_pd_power(struct generic_pm_domain *domain, bool power_on)
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{
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struct exynos_pm_domain *pd;
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void __iomem *base;
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u32 timeout, pwr;
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char *op;
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pd = container_of(domain, struct exynos_pm_domain, pd);
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base = pd->base;
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pwr = power_on ? S5P_INT_LOCAL_PWR_EN : 0;
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__raw_writel(pwr, base);
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/* Wait max 1ms */
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timeout = 10;
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while ((__raw_readl(base + 0x4) & S5P_INT_LOCAL_PWR_EN) != pwr) {
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if (!timeout) {
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op = (power_on) ? "enable" : "disable";
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pr_err("Power domain %s %s failed\n", domain->name, op);
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return -ETIMEDOUT;
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}
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timeout--;
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cpu_relax();
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usleep_range(80, 100);
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}
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return 0;
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}
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static int exynos_pd_power_on(struct generic_pm_domain *domain)
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{
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return exynos_pd_power(domain, true);
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}
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static int exynos_pd_power_off(struct generic_pm_domain *domain)
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{
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return exynos_pd_power(domain, false);
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}
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#define EXYNOS_GPD(PD, BASE, NAME) \
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static struct exynos_pm_domain PD = { \
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.base = (void __iomem *)BASE, \
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.name = NAME, \
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.pd = { \
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.power_off = exynos_pd_power_off, \
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.power_on = exynos_pd_power_on, \
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}, \
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}
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#ifdef CONFIG_OF
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static __init int exynos_pm_dt_parse_domains(void)
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{
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struct device_node *np;
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for_each_compatible_node(np, NULL, "samsung,exynos4210-pd") {
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struct exynos_pm_domain *pd;
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pd = kzalloc(sizeof(*pd), GFP_KERNEL);
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if (!pd) {
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pr_err("%s: failed to allocate memory for domain\n",
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__func__);
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return -ENOMEM;
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}
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if (of_get_property(np, "samsung,exynos4210-pd-off", NULL))
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pd->is_off = true;
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pd->name = np->name;
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pd->base = of_iomap(np, 0);
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pd->pd.power_off = exynos_pd_power_off;
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pd->pd.power_on = exynos_pd_power_on;
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pd->pd.of_node = np;
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pm_genpd_init(&pd->pd, NULL, false);
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}
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return 0;
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}
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#else
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static __init int exynos_pm_dt_parse_domains(void)
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{
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return 0;
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}
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#endif /* CONFIG_OF */
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static __init void exynos_pm_add_dev_to_genpd(struct platform_device *pdev,
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struct exynos_pm_domain *pd)
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{
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if (pdev->dev.bus) {
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if (!pm_genpd_add_device(&pd->pd, &pdev->dev))
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pm_genpd_dev_need_restore(&pdev->dev, true);
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else
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pr_info("%s: error in adding %s device to %s power"
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"domain\n", __func__, dev_name(&pdev->dev),
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pd->name);
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}
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}
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EXYNOS_GPD(exynos4_pd_mfc, S5P_PMU_MFC_CONF, "pd-mfc");
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EXYNOS_GPD(exynos4_pd_g3d, S5P_PMU_G3D_CONF, "pd-g3d");
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EXYNOS_GPD(exynos4_pd_lcd0, S5P_PMU_LCD0_CONF, "pd-lcd0");
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EXYNOS_GPD(exynos4_pd_lcd1, S5P_PMU_LCD1_CONF, "pd-lcd1");
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EXYNOS_GPD(exynos4_pd_tv, S5P_PMU_TV_CONF, "pd-tv");
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EXYNOS_GPD(exynos4_pd_cam, S5P_PMU_CAM_CONF, "pd-cam");
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EXYNOS_GPD(exynos4_pd_gps, S5P_PMU_GPS_CONF, "pd-gps");
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static struct exynos_pm_domain *exynos4_pm_domains[] = {
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&exynos4_pd_mfc,
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&exynos4_pd_g3d,
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&exynos4_pd_lcd0,
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&exynos4_pd_lcd1,
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&exynos4_pd_tv,
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&exynos4_pd_cam,
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&exynos4_pd_gps,
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};
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static __init int exynos4_pm_init_power_domain(void)
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{
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int idx;
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if (of_have_populated_dt())
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return exynos_pm_dt_parse_domains();
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for (idx = 0; idx < ARRAY_SIZE(exynos4_pm_domains); idx++) {
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struct exynos_pm_domain *pd = exynos4_pm_domains[idx];
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int on = __raw_readl(pd->base + 0x4) & S5P_INT_LOCAL_PWR_EN;
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pm_genpd_init(&pd->pd, NULL, !on);
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}
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#ifdef CONFIG_S5P_DEV_FIMD0
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exynos_pm_add_dev_to_genpd(&s5p_device_fimd0, &exynos4_pd_lcd0);
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#endif
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#ifdef CONFIG_S5P_DEV_TV
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exynos_pm_add_dev_to_genpd(&s5p_device_hdmi, &exynos4_pd_tv);
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exynos_pm_add_dev_to_genpd(&s5p_device_mixer, &exynos4_pd_tv);
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#endif
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#ifdef CONFIG_S5P_DEV_MFC
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exynos_pm_add_dev_to_genpd(&s5p_device_mfc, &exynos4_pd_mfc);
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#endif
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#ifdef CONFIG_S5P_DEV_FIMC0
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exynos_pm_add_dev_to_genpd(&s5p_device_fimc0, &exynos4_pd_cam);
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#endif
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#ifdef CONFIG_S5P_DEV_FIMC1
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exynos_pm_add_dev_to_genpd(&s5p_device_fimc1, &exynos4_pd_cam);
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#endif
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#ifdef CONFIG_S5P_DEV_FIMC2
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exynos_pm_add_dev_to_genpd(&s5p_device_fimc2, &exynos4_pd_cam);
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#endif
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#ifdef CONFIG_S5P_DEV_FIMC3
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exynos_pm_add_dev_to_genpd(&s5p_device_fimc3, &exynos4_pd_cam);
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#endif
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#ifdef CONFIG_S5P_DEV_CSIS0
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exynos_pm_add_dev_to_genpd(&s5p_device_mipi_csis0, &exynos4_pd_cam);
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#endif
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#ifdef CONFIG_S5P_DEV_CSIS1
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exynos_pm_add_dev_to_genpd(&s5p_device_mipi_csis1, &exynos4_pd_cam);
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#endif
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#ifdef CONFIG_S5P_DEV_G2D
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exynos_pm_add_dev_to_genpd(&s5p_device_g2d, &exynos4_pd_lcd0);
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#endif
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#ifdef CONFIG_S5P_DEV_JPEG
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exynos_pm_add_dev_to_genpd(&s5p_device_jpeg, &exynos4_pd_cam);
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#endif
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return 0;
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}
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arch_initcall(exynos4_pm_init_power_domain);
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int __init exynos_pm_late_initcall(void)
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{
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pm_genpd_poweroff_unused();
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return 0;
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}
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