In order to meet high performance and low power requirements, a power management unit is designed or saving power when RK3288 in low power mode. The RK3288 PMU is dedicated for managing the power ot the whole chip. Signed-off-by: jinkun.hong <jinkun.hong@xxxxxxxxxxxxxx> Signed-off-by: Caesar Wang <wxt@xxxxxxxxxxxxxx> --- arch/arm/mach-rockchip/Kconfig | 1 + arch/arm/mach-rockchip/Makefile | 1 + arch/arm/mach-rockchip/pm_domains.c | 506 ++++++++++++++++++++++++++++++++++++ 3 files changed, 508 insertions(+) create mode 100644 arch/arm/mach-rockchip/pm_domains.c diff --git a/arch/arm/mach-rockchip/Kconfig b/arch/arm/mach-rockchip/Kconfig index ae4eb7c..578206b 100644 --- a/arch/arm/mach-rockchip/Kconfig +++ b/arch/arm/mach-rockchip/Kconfig @@ -15,6 +15,7 @@ config ARCH_ROCKCHIP select ROCKCHIP_TIMER select ARM_GLOBAL_TIMER select CLKSRC_ARM_GLOBAL_TIMER_SCHED_CLOCK + select PM_GENERIC_DOMAINS if PM help Support for Rockchip's Cortex-A9 Single-to-Quad-Core-SoCs containing the RK2928, RK30xx and RK31xx series. diff --git a/arch/arm/mach-rockchip/Makefile b/arch/arm/mach-rockchip/Makefile index 5c3a9b2..9c902d3 100644 --- a/arch/arm/mach-rockchip/Makefile +++ b/arch/arm/mach-rockchip/Makefile @@ -1,5 +1,6 @@ CFLAGS_platsmp.o := -march=armv7-a obj-$(CONFIG_ARCH_ROCKCHIP) += rockchip.o +obj-$(CONFIG_PM_GENERIC_DOMAINS) += pm_domains.o obj-$(CONFIG_PM_SLEEP) += pm.o sleep.o obj-$(CONFIG_SMP) += headsmp.o platsmp.o diff --git a/arch/arm/mach-rockchip/pm_domains.c b/arch/arm/mach-rockchip/pm_domains.c new file mode 100644 index 0000000..92d2569 --- /dev/null +++ b/arch/arm/mach-rockchip/pm_domains.c @@ -0,0 +1,506 @@ +/* + * Rockchip Generic power domain support. + * + * Copyright (c) 2014 ROCKCHIP, Co. Ltd. + * + * 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/io.h> +#include <linux/err.h> +#include <linux/pm_clock.h> +#include <linux/pm_domain.h> +#include <linux/of_address.h> +#include <linux/of_platform.h> +#include <linux/clk.h> +#include <linux/clk-provider.h> +#include <linux/regmap.h> +#include <linux/mfd/syscon.h> +#include <dt-bindings/power-domain/rk3288.h> + +struct rockchip_domain_info { + int pwr_mask; + int status_mask; + int req_mask; + int idle_mask; + int ack_mask; +}; + +struct rockchip_pmu_info { + u32 pwr_offset; + u32 status_offset; + u32 req_offset; + u32 idle_offset; + u32 ack_offset; + + u32 core_pwrcnt_offset; + u32 gpu_pwrcnt_offset; + + unsigned int core_power_transition_time; + unsigned int gpu_power_transition_time; + + int num_domains; + const struct rockchip_domain_info *domain_info; +}; + +struct rockchip_pm_domain { + struct generic_pm_domain genpd; + const struct rockchip_domain_info *info; + struct rockchip_pmu *pmu; + int num_clks; + struct clk *clks[]; +}; + +struct rockchip_pmu { + struct device *dev; + struct regmap *regmap; + const struct rockchip_pmu_info *info; + struct mutex mutex; /* mutex lock for pmu */ + struct genpd_onecell_data genpd_data; + struct generic_pm_domain *domains[]; +}; + +#define to_rockchip_pd(gpd) container_of(gpd, struct rockchip_pm_domain, genpd) + +#define DOMAIN(pwr, status, req, idle, ack) \ +{ \ + .pwr_mask = BIT(pwr), \ + .status_mask = BIT(status), \ + .req_mask = BIT(req), \ + .idle_mask = BIT(idle), \ + .ack_mask = BIT(ack), \ +} + +#define DOMAIN_RK3288(pwr, status, req) \ + DOMAIN(pwr, status, req, req, (req) + 16) + +static bool rockchip_pmu_domain_is_idle(struct rockchip_pm_domain *pd) +{ + struct rockchip_pmu *pmu = pd->pmu; + const struct rockchip_domain_info *pd_info = pd->info; + unsigned int val; + + regmap_read(pmu->regmap, pmu->info->idle_offset, &val); + return (val & pd_info->idle_mask) == pd_info->idle_mask; +} + +static int rockchip_pmu_set_idle_request(struct rockchip_pm_domain *pd, + bool idle) +{ + const struct rockchip_domain_info *pd_info = pd->info; + struct rockchip_pmu *pmu = pd->pmu; + unsigned int val; + + regmap_update_bits(pmu->regmap, pmu->info->req_offset, + pd_info->req_mask, idle ? -1U : 0); + + dsb(); + + do { + regmap_read(pmu->regmap, pmu->info->ack_offset, &val); + } while ((val & pd_info->ack_mask) != (idle ? pd_info->ack_mask : 0)); + + while (rockchip_pmu_domain_is_idle(pd) != idle) + cpu_relax(); + + return 0; +} + +static bool rockchip_pmu_domain_is_on(struct rockchip_pm_domain *pd) +{ + struct rockchip_pmu *pmu = pd->pmu; + unsigned int val; + + regmap_read(pmu->regmap, pmu->info->status_offset, &val); + + /* 1'b0: power on, 1'b1: power off */ + return !(val & pd->info->status_mask); +} + +static void rockchip_do_pmu_set_power_domain(struct rockchip_pm_domain *pd, + bool on) +{ + struct rockchip_pmu *pmu = pd->pmu; + + regmap_update_bits(pmu->regmap, pmu->info->pwr_offset, + pd->info->pwr_mask, on ? 0 : -1U); + + dsb(); + + while (rockchip_pmu_domain_is_on(pd) != on) + cpu_relax(); +} + +static int rockchip_pd_power(struct rockchip_pm_domain *pd, bool power_on) +{ + int i; + + mutex_lock(&pd->pmu->mutex); + + if (rockchip_pmu_domain_is_on(pd) != power_on) { + for (i = 0; i < pd->num_clks; i++) + clk_enable(pd->clks[i]); + + if (!power_on) { + /* FIXME: add code to save AXI_QOS */ + + /* if powering down, idle request to NIU first */ + rockchip_pmu_set_idle_request(pd, true); + } + + rockchip_do_pmu_set_power_domain(pd, power_on); + + if (power_on) { + /* if powering up, leave idle mode */ + rockchip_pmu_set_idle_request(pd, false); + + /* FIXME: add code to restore AXI_QOS */ + } + + for (i = pd->num_clks - 1; i >= 0; i--) + clk_disable(pd->clks[i]); + } + + mutex_unlock(&pd->pmu->mutex); + return 0; +} + +static int rockchip_pd_power_on(struct generic_pm_domain *domain) +{ + struct rockchip_pm_domain *pd = to_rockchip_pd(domain); + + return rockchip_pd_power(pd, true); +} + +static int rockchip_pd_power_off(struct generic_pm_domain *domain) +{ + struct rockchip_pm_domain *pd = to_rockchip_pd(domain); + + return rockchip_pd_power(pd, false); +} + +static int rockchip_pd_attach_dev(struct generic_pm_domain *genpd, + struct device *dev) +{ + struct clk *clk; + int i; + int error; + + dev_dbg(dev, "attaching to power domain '%s'\n", genpd->name); + + error = pm_clk_create(dev); + if (error) { + dev_err(dev, "pm_clk_create failed %d\n", error); + return error; + } + + i = 0; + while ((clk = of_clk_get(dev->of_node, i++)) && !IS_ERR(clk)) { + dev_dbg(dev, "adding clock '%s' to list of PM clocks\n", + __clk_get_name(clk)); + error = pm_clk_add_clk(dev, clk); + clk_put(clk); + if (error) { + dev_err(dev, "pm_clk_add_clk failed %d\n", error); + pm_clk_destroy(dev); + return error; + } + } + + return 0; +} + +static void rockchip_pd_detach_dev(struct generic_pm_domain *genpd, + struct device *dev) +{ + dev_dbg(dev, "detaching from power domain '%s'\n", genpd->name); + + pm_clk_destroy(dev); +} + +static int rockchip_pd_start_dev(struct device *dev) +{ + struct generic_pm_domain *genpd = pd_to_genpd(dev->pm_domain); + + dev_dbg(dev, "starting device in power domain '%s'\n", genpd->name); + + return pm_clk_resume(dev); +} + +static int rockchip_pd_stop_dev(struct device *dev) +{ + struct generic_pm_domain *genpd = pd_to_genpd(dev->pm_domain); + + dev_dbg(dev, "stopping device in power domain '%s'\n", genpd->name); + + return pm_clk_suspend(dev); +} + +static int rockchip_pm_add_one_domain(struct rockchip_pmu *pmu, + struct device_node *node) +{ + const struct rockchip_domain_info *pd_info; + struct rockchip_pm_domain *pd; + struct clk *clk; + int clk_cnt; + int i; + u32 id; + int error; + + error = of_property_read_u32(node, "reg", &id); + if (error) { + dev_err(pmu->dev, + "%s: failed to retrieve domain id (reg): %d\n", + node->name, error); + return -EINVAL; + } + + if (id >= pmu->info->num_domains) { + dev_err(pmu->dev, "%s: invalid domain id %d\n", + node->name, id); + return -EINVAL; + } + + pd_info = &pmu->info->domain_info[id]; + if (!pd_info) { + dev_err(pmu->dev, "%s: undefined domain id %d\n", + node->name, id); + return -EINVAL; + } + + clk_cnt = of_count_phandle_with_args(node, "clocks", "#clock-cells"); + pd = devm_kzalloc(pmu->dev, + sizeof(*pd) + clk_cnt * sizeof(pd->clks[0]), + GFP_KERNEL); + if (!pd) + return -ENOMEM; + + pd->info = pd_info; + pd->pmu = pmu; + + for (i = 0; i < clk_cnt; i++) { + clk = of_clk_get(node, i); + if (IS_ERR(clk)) { + error = PTR_ERR(clk); + dev_err(pmu->dev, + "%s: failed to get clk %s (index %d): %d\n", + node->name, __clk_get_name(clk), i, error); + goto err_out; + } + + error = clk_prepare(clk); + if (error) { + dev_err(pmu->dev, + "%s: failed to prepare clk %s (index %d): %d\n", + node->name, __clk_get_name(clk), i, error); + clk_put(clk); + goto err_out; + } + + pd->clks[pd->num_clks++] = clk; + + dev_dbg(pmu->dev, "added clock '%s' to domain '%s'\n", + __clk_get_name(clk), node->name); + } + + error = rockchip_pd_power(pd, true); + if (error) { + dev_err(pmu->dev, + "failed to power on domain '%s': %d\n", + node->name, error); + goto err_out; + } + + pd->genpd.name = node->name; + pd->genpd.power_off = rockchip_pd_power_off; + pd->genpd.power_on = rockchip_pd_power_on; + pd->genpd.attach_dev = rockchip_pd_attach_dev; + pd->genpd.detach_dev = rockchip_pd_detach_dev; + pd->genpd.dev_ops.start = rockchip_pd_start_dev; + pd->genpd.dev_ops.stop = rockchip_pd_stop_dev; + pm_genpd_init(&pd->genpd, NULL, false); + + pmu->genpd_data.domains[id] = &pd->genpd; + return 0; + +err_out: + while (--i >= 0) { + clk_unprepare(pd->clks[i]); + clk_put(pd->clks[i]); + } + return error; +} + +static void rockchip_pm_remove_one_domain(struct rockchip_pm_domain *pd) +{ + int i; + + for (i = 0; i < pd->num_clks; i++) { + clk_unprepare(pd->clks[i]); + clk_put(pd->clks[i]); + } + + /* devm will free our memory */ +} + +static void rockchip_pm_domain_cleanup(struct rockchip_pmu *pmu) +{ + struct generic_pm_domain *genpd; + struct rockchip_pm_domain *pd; + int i; + + for (i = 0; i < pmu->genpd_data.num_domains; i++) { + genpd = pmu->genpd_data.domains[i]; + if (genpd) { + pd = to_rockchip_pd(genpd); + rockchip_pm_remove_one_domain(pd); + } + } + + /* devm will free our memory */ +} + +static void rockchip_configure_pd_cnt(struct rockchip_pmu *pmu, + u32 domain_reg_offset, + unsigned int count) +{ + /* First configure domain power down transition count ... */ + regmap_write(pmu->regmap, domain_reg_offset, count); + /* ... and then power up count. */ + regmap_write(pmu->regmap, domain_reg_offset + 4, count); +} + +static int rockchip_pm_domain_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + struct device_node *node; + struct rockchip_pmu *pmu; + const struct of_device_id *match; + const struct rockchip_pmu_info *pmu_info; + int error; + + if (!np) { + dev_err(dev, "device tree node not found\n"); + return -ENXIO; + } + + match = of_match_device(dev->driver->of_match_table, dev); + if (!match || !match->data) { + dev_err(dev, "missing pmu data\n"); + return -EINVAL; + } + + pmu_info = match->data; + + pmu = devm_kzalloc(dev, + sizeof(*pmu) + + pmu_info->num_domains * sizeof(pmu->domains[0]), + GFP_KERNEL); + if (!pmu) + return -ENOMEM; + + pmu->dev = &pdev->dev; + mutex_init(&pmu->mutex); + + pmu->info = pmu_info; + + pmu->genpd_data.domains = pmu->domains; + pmu->genpd_data.num_domains = pmu_info->num_domains; + + node = of_parse_phandle(np, "rockchip,pmu", 0); + pmu->regmap = syscon_node_to_regmap(node); + of_node_put(node); + if (IS_ERR(pmu->regmap)) { + error = PTR_ERR(pmu->regmap); + dev_err(dev, "failed to get PMU regmap: %d\n", error); + return error; + } + + /* + * Configure power up and down transition delays for core + * and GPU domains. + */ + rockchip_configure_pd_cnt(pmu, pmu_info->core_pwrcnt_offset, + pmu_info->core_power_transition_time); + rockchip_configure_pd_cnt(pmu, pmu_info->gpu_pwrcnt_offset, + pmu_info->gpu_power_transition_time); + + error = -ENXIO; + + for_each_available_child_of_node(np, node) { + error = rockchip_pm_add_one_domain(pmu, node); + if (error) { + dev_err(dev, "failed to handle node %s: %d\n", + node->name, error); + goto err_out; + } + } + + if (error) { + dev_dbg(dev, "no power domains defined\n"); + goto err_out; + } + + of_genpd_add_provider_onecell(np, &pmu->genpd_data); + + return 0; + +err_out: + rockchip_pm_domain_cleanup(pmu); + return error; +} + +static const struct rockchip_domain_info rk3288_pm_domains[] = { + [RK3288_PD_GPU] = DOMAIN_RK3288(9, 9, 2), + [RK3288_PD_VIO] = DOMAIN_RK3288(7, 7, 4), + [RK3288_PD_VIDEO] = DOMAIN_RK3288(8, 8, 3), + [RK3288_PD_HEVC] = DOMAIN_RK3288(14, 10, 9), +}; + +static const struct rockchip_pmu_info rk3288_pmu = { + .pwr_offset = 0x08, + .status_offset = 0x0c, + .req_offset = 0x10, + .idle_offset = 0x14, + .ack_offset = 0x14, + + .core_pwrcnt_offset = 0x34, + .gpu_pwrcnt_offset = 0x3c, + + .core_power_transition_time = 24, /* 1us */ + .gpu_power_transition_time = 24, /* 1us */ + + .num_domains = ARRAY_SIZE(rk3288_pm_domains), + .domain_info = rk3288_pm_domains, +}; + +static const struct of_device_id rockchip_pm_domain_dt_match[] = { + { + .compatible = "rockchip,rk3288-power-controller", + .data = (void *)&rk3288_pmu, + }, + { /* sentinel */ }, +}; + +static struct platform_driver rockchip_pm_domain_driver = { + .probe = rockchip_pm_domain_probe, + .driver = { + .name = "rockchip-pm-domain", + .of_match_table = rockchip_pm_domain_dt_match, + /* + * We can't forcibly eject devices form power domain, + * so we can't really remove power domains once they + * were added. + */ + .suppress_bind_attrs = true, + }, +}; + +static int __init rockchip_pm_domain_drv_register(void) +{ + return platform_driver_register(&rockchip_pm_domain_driver); +} +postcore_initcall(rockchip_pm_domain_drv_register); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html