@@ -12,6 +12,7 @@ config ARCH_ROCKCHIP
select DW_APB_TIMER_OF
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.
@@ -2,3 +2,4 @@ CFLAGS_platsmp.o := -march=armv7-a
obj-$(CONFIG_ARCH_ROCKCHIP) += rockchip.o
obj-$(CONFIG_SMP) += headsmp.o platsmp.o
+obj-$(CONFIG_PM_GENERIC_DOMAINS) += pm_domains.o
new file mode 100644
@@ -0,0 +1,355 @@
+/*
+ * Rockchip Generic power domain support.
+ *
+ * Copyright (c) 2014 ROCKCHIP, Co. Ltd.
+ * Author: Hong Jinkun <jinkun.hong@rock-chips.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/module.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/pm_domain.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/sched.h>
+#include <linux/clk.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+#include <linux/spinlock.h>
+#include <linux/pm_clock.h>
+#include <linux/delay.h>
+
+#define PWR_OFFSET 0x08
+#define STATUS_OFFSET 0x0c
+#define REQ_OFFSET 0x10
+#define IDLE_OFFSET 0x14
+#define ACK_OFFSET 0x14
+#define PMU_TIMEOUT_MAX 10000
+
+struct rockchip_dev_entry {
+ struct list_head node;
+ struct device *dev;
+};
+
+struct rockchip_domain {
+ struct generic_pm_domain base;
+ struct device *dev;
+ struct regmap *regmap_pmu;
+ struct list_head dev_list;
+ /* mutex lock for dev_list */
+ struct mutex dev_lock;
+ u32 pwr_shift;
+ u32 status_shift;
+ u32 req_shift;
+ u32 idle_shift;
+ u32 ack_shift;
+};
+
+#define to_rockchip_pd(_gpd) container_of(_gpd, struct rockchip_domain, base)
+
+static int rockchip_pmu_set_idle_request(struct rockchip_domain *pd,
+ bool idle)
+{
+ u32 idle_mask = BIT(pd->idle_shift);
+ u32 idle_target = idle << (pd->idle_shift);
+ u32 ack_mask = BIT(pd->ack_shift);
+ u32 ack_target = idle << (pd->ack_shift);
+ unsigned int mask = BIT(pd->req_shift);
+ unsigned int val;
+ int timeout = 0;
+
+ val = (idle) ? mask : 0;
+ regmap_update_bits(pd->regmap_pmu, REQ_OFFSET, mask, val);
+ dsb();
+
+ do {
+ regmap_read(pd->regmap_pmu, ACK_OFFSET, &val);
+ udelay(1);
+ if (timeout > PMU_TIMEOUT_MAX) {
+ pr_err("%s wait pmu ack timeout!\n", __func__);
+ break;
+ }
+ timeout += 1;
+ } while ((val & ack_mask) != ack_target);
+
+ timeout = 0;
+
+ do {
+ regmap_read(pd->regmap_pmu, IDLE_OFFSET, &val);
+ udelay(1);
+ if (timeout > PMU_TIMEOUT_MAX) {
+ pr_err("%s wait pmu idle timeout!\n", __func__);
+ break;
+ }
+ timeout += 1;
+ } while ((val & idle_mask) != idle_target);
+
+ return 0;
+}
+
+static bool rockchip_pmu_power_domain_is_on(struct rockchip_domain *pd)
+{
+ unsigned int val;
+
+ regmap_read(pd->regmap_pmu, STATUS_OFFSET, &val);
+
+ /* 1'b0: power on, 1'b1: power off */
+ return !(val & BIT(pd->status_shift));
+}
+
+static void rockchip_do_pmu_set_power_domain(
+ struct rockchip_domain *pd, bool on)
+{
+ unsigned int mask = BIT(pd->pwr_shift);
+ unsigned int val;
+
+ val = (on) ? 0 : mask;
+ regmap_update_bits(pd->regmap_pmu, PWR_OFFSET, mask, val);
+ dsb();
+
+ do {
+ regmap_read(pd->regmap_pmu, STATUS_OFFSET, &val);
+ } while ((val & BIT(pd->status_shift)) == on);
+}
+
+static int rockchip_pmu_set_power_domain(struct rockchip_domain *pd,
+ bool on)
+{
+ if (rockchip_pmu_power_domain_is_on(pd) == on)
+ return 0;
+
+ if (!on) {
+ /* FIXME: add code to save AXI_QOS */
+ /* if power down, idle request to NIU first */
+ rockchip_pmu_set_idle_request(pd, true);
+ }
+
+ rockchip_do_pmu_set_power_domain(pd, on);
+
+ if (on) {
+ /* if power up, idle request release to NIU */
+ rockchip_pmu_set_idle_request(pd, false);
+ /* FIXME: add code to restore AXI_QOS */
+ }
+
+ return 0;
+}
+
+static int rockchip_pd_power(struct rockchip_domain *pd, bool power_on)
+{
+ int ret = 0;
+ struct rockchip_dev_entry *de;
+
+ mutex_lock(&pd->dev_lock);
+ /* no clk, set power domain will fail */
+ if (list_empty(&pd->dev_list)) {
+ pr_err("%s: no devices in %s power domain\n", __func__,
+ pd->base.name);
+ goto out;
+ }
+
+ list_for_each_entry(de, &pd->dev_list, node) {
+ pm_clk_resume(de->dev);
+ }
+
+ ret = rockchip_pmu_set_power_domain(pd, power_on);
+
+ list_for_each_entry(de, &pd->dev_list, node) {
+ pm_clk_suspend(de->dev);
+ }
+out:
+ mutex_unlock(&pd->dev_lock);
+ return ret;
+}
+
+static int rockchip_pd_power_on(struct generic_pm_domain *domain)
+{
+ struct rockchip_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_domain *pd = to_rockchip_pd(domain);
+
+ return rockchip_pd_power(pd, false);
+}
+
+void rockchip_pm_domain_attach_dev(struct device *dev)
+{
+ int ret;
+ int i = 0;
+ struct clk *clk;
+ struct rockchip_domain *pd;
+ struct rockchip_dev_entry *de;
+
+ pd = (struct rockchip_domain *)dev->pm_domain;
+ ret = pm_clk_create(dev);
+ if (ret) {
+ dev_err(dev, "pm_clk_create failed %d\n", ret);
+ return;
+ }
+
+ while ((clk = of_clk_get(dev->of_node, i++)) && !IS_ERR(clk)) {
+ ret = pm_clk_add_clk(dev, clk);
+ if (ret) {
+ dev_err(dev, "pm_clk_add_clk failed %d\n", ret);
+ pm_clk_destroy(dev);
+ return;
+ }
+ }
+
+ de = devm_kzalloc(pd->dev,
+ sizeof(struct rockchip_dev_entry *), GFP_KERNEL);
+ de->dev = dev;
+ mutex_lock(&pd->dev_lock);
+ list_add_tail(&de->node, &pd->dev_list);
+ mutex_unlock(&pd->dev_lock);
+
+ return;
+}
+
+void rockchip_pm_domain_detach_dev(struct device *dev)
+{
+ struct rockchip_domain *pd;
+ struct rockchip_dev_entry *de;
+
+ pd = (struct rockchip_domain *)dev->pm_domain;
+ mutex_lock(&pd->dev_lock);
+
+ list_for_each_entry(de, &pd->dev_list, node) {
+ if (de->dev == dev) {
+ list_del(&de->node);
+ pm_clk_destroy(dev);
+ devm_kfree(pd->dev, de);
+ }
+ }
+
+ mutex_unlock(&pd->dev_lock);
+}
+
+static const struct of_device_id rockchip_pm_domain_dt_match[];
+
+static int rockchip_pm_domain_probe(struct platform_device *pdev)
+{
+ struct device_node *node;
+ struct regmap *regmap_pmu;
+ struct rockchip_domain *pd;
+ const struct of_device_id *match;
+
+ match = of_match_node(rockchip_pm_domain_dt_match, pdev->dev.of_node);
+ pd = (struct rockchip_domain *)match->data;
+ if (!pd)
+ return -ENOMEM;
+
+ node = of_parse_phandle(pdev->dev.of_node, "rockchip,pmu", 0);
+ regmap_pmu = syscon_node_to_regmap(node);
+ of_node_put(node);
+ if (IS_ERR(regmap_pmu)) {
+ pr_err("%s: failed to get regmap_pmu", __func__);
+ return PTR_ERR(regmap_pmu);
+ }
+
+ pd->regmap_pmu = regmap_pmu;
+ pd->dev = &pdev->dev;
+
+ INIT_LIST_HEAD(&pd->dev_list);
+ mutex_init(&pd->dev_lock);
+ pm_genpd_init(&pd->base, NULL, false);
+
+ return of_genpd_add_provider_simple(pdev->dev.of_node, &pd->base);
+}
+
+static struct rockchip_domain gpu_domain = {
+ .base = {
+ .name = "pd_gpu",
+ .attach_dev = rockchip_pm_domain_attach_dev,
+ .detach_dev = rockchip_pm_domain_detach_dev,
+ .power_off = rockchip_pd_power_off,
+ .power_on = rockchip_pd_power_on,
+ },
+ .pwr_shift = 9,
+ .status_shift = 9,
+ .req_shift = 2,
+ .idle_shift = 2,
+ .ack_shift = 18,
+};
+
+static struct rockchip_domain hevc_domain = {
+ .base = {
+ .name = "pd_hevc",
+ .attach_dev = rockchip_pm_domain_attach_dev,
+ .detach_dev = rockchip_pm_domain_detach_dev,
+ .power_off = rockchip_pd_power_off,
+ .power_on = rockchip_pd_power_on,
+ },
+ .pwr_shift = 14,
+ .status_shift = 10,
+ .req_shift = 9,
+ .idle_shift = 9,
+ .ack_shift = 25,
+
+};
+
+static struct rockchip_domain video_domain = {
+ .base = {
+ .name = "pd_video",
+ .attach_dev = rockchip_pm_domain_attach_dev,
+ .detach_dev = rockchip_pm_domain_detach_dev,
+ .power_off = rockchip_pd_power_off,
+ .power_on = rockchip_pd_power_on,
+ },
+ .pwr_shift = 8,
+ .status_shift = 8,
+ .req_shift = 3,
+ .idle_shift = 3,
+ .ack_shift = 19,
+};
+
+static struct rockchip_domain vio_domain = {
+ .base = {
+ .name = "pd_vio",
+ .attach_dev = rockchip_pm_domain_attach_dev,
+ .detach_dev = rockchip_pm_domain_detach_dev,
+ .power_off = rockchip_pd_power_off,
+ .power_on = rockchip_pd_power_on,
+ },
+ .pwr_shift = 7,
+ .status_shift = 7,
+ .req_shift = 4,
+ .idle_shift = 4,
+ .ack_shift = 20,
+};
+
+static const struct of_device_id rockchip_pm_domain_dt_match[] = {
+ { .compatible = "rockchip,rk3288-power-gpu",
+ .data = (void *)&gpu_domain},
+ { .compatible = "rockchip,rk3288-power-hevc",
+ .data = (void *)&hevc_domain},
+ { .compatible = "rockchip,rk3288-power-video",
+ .data = (void *)&video_domain},
+ { .compatible = "rockchip,rk3288-power-vio",
+ .data = (void *)&vio_domain},
+ {},
+};
+MODULE_DEVICE_TABLE(of, rockchip_pm_domain_dt_match);
+
+static struct platform_driver rockchip_pm_domain_driver = {
+ .probe = rockchip_pm_domain_probe,
+ .driver = {
+ .name = "rockchip-pm-domain",
+ .owner = THIS_MODULE,
+ .of_match_table = rockchip_pm_domain_dt_match,
+ },
+};
+
+static int __init rockchip_pm_domain_drv_register(void)
+{
+ return platform_driver_register(&rockchip_pm_domain_driver);
+}
+postcore_initcall(rockchip_pm_domain_drv_register);