[PATCH v4 1/3] power-domain: add power domain drivers for Rockchip platform

["jinkun.hong" <jinkun.hong@rock-chips.com>]

From: "jinkun.hong" <jinkun.hong@rock-chips.com>

Add power domain drivers based on generic power domain for Rockchip platform,
and support RK3288.

Signed-off-by: Jack Dai <jack.dai@rock-chips.com>
Signed-off-by: jinkun.hong <jinkun.hong@rock-chips.com>

---

Changes in v4:
- use list storage dev

Changes in v3:
- change use pm_clk_resume() and pm_clk_suspend()

Changes in v2:
- remove the "pd->pd.of_node = np"

 arch/arm/mach-rockchip/Kconfig      |    1 +
 arch/arm/mach-rockchip/Makefile     |    1 +
 arch/arm/mach-rockchip/pm_domains.c |  360 +++++++++++++++++++++++++++++++++++
 3 files changed, 362 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 d168669..4920a88 100644
--- a/arch/arm/mach-rockchip/Kconfig
+++ b/arch/arm/mach-rockchip/Kconfig
@@ -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.
diff --git a/arch/arm/mach-rockchip/Makefile b/arch/arm/mach-rockchip/Makefile
index b29d8ea..805268d 100644
--- a/arch/arm/mach-rockchip/Makefile
+++ b/arch/arm/mach-rockchip/Makefile
@@ -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
diff --git a/arch/arm/mach-rockchip/pm_domains.c b/arch/arm/mach-rockchip/pm_domains.c
new file mode 100644
index 0000000..28f32a5
--- /dev/null
+++ b/arch/arm/mach-rockchip/pm_domains.c
@@ -0,0 +1,360 @@
+/*
+ * 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>
+
+#define PWR_OFFSET		0x08
+#define STATUS_OFFSET	0x0c
+#define REQ_OFFSET		0x10
+#define IDLE_OFFSET		0x14
+#define ACK_OFFSET		0x14
+
+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;
+	spinlock_t idle_lock;
+	spinlock_t pmu_lock;
+	spinlock_t 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;
+	unsigned long flags;
+
+	spin_lock_irqsave(&pd->idle_lock, flags);
+	val = (idle) ? mask : 0;
+	regmap_update_bits(pd->regmap_pmu, REQ_OFFSET, mask, val);
+	dsb();
+
+	do {
+		regmap_read(pd->regmap_pmu, ACK_OFFSET, &val);
+	} while ((val & ack_mask) != ack_target);
+
+	do {
+		regmap_read(pd->regmap_pmu, IDLE_OFFSET, &val);
+	} while ((val & idle_mask) != idle_target);
+
+	spin_unlock_irqrestore(&pd->idle_lock, flags);
+
+	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)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&pd->pmu_lock, flags);
+	if (rockchip_pmu_power_domain_is_on(pd) == on)
+		goto out;
+
+	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 */
+	}
+out:
+	spin_unlock_irqrestore(&pd->pmu_lock, flags);
+	return 0;
+}
+
+static int rockchip_pd_power(struct rockchip_domain *pd, bool power_on)
+{
+	int i = 0;
+	int ret = 0;
+	struct rockchip_dev_entry *de;
+
+	spin_lock_irq(&pd->dev_lock);
+
+	list_for_each_entry(de, &pd->dev_list, node) {
+		i += 1;
+		pm_clk_resume(pd->dev);
+	}
+
+	/* no clk, set power domain will fail */
+	if (i == 0) {
+		pr_err("%s: failed to on/off power domain!", __func__);
+		spin_unlock_irq(&pd->dev_lock);
+		return ret;
+	}
+
+	ret = rockchip_pmu_set_power_domain(pd, power_on);
+
+	list_for_each_entry(de, &pd->dev_list, node) {
+		pm_clk_suspend(pd->dev);
+	}
+
+	spin_unlock_irq(&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);
+			goto clk_err;
+		};
+	}
+
+	de = devm_kcalloc(pd->dev, 1,
+			sizeof(struct rockchip_dev_entry *), GFP_KERNEL);
+	spin_lock_irq(&pd->dev_lock);
+	list_add_tail(&de->node, &pd->dev_list);
+	spin_unlock_irq(&pd->dev_lock);
+
+	return;
+clk_err:
+	pm_clk_destroy(dev);
+}
+
+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;
+
+	spin_lock_irq(&pd->dev_lock);
+
+	list_for_each_entry(de, &pd->dev_list, node) {
+		if (de->dev == dev)
+			goto remove;
+	}
+	spin_unlock_irq(&pd->dev_lock);
+
+	return;
+remove:
+	list_del(&de->node);
+	spin_unlock_irq(&pd->dev_lock);
+	pm_clk_destroy(dev);
+}
+
+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);
+
+	spin_lock_init(&pd->idle_lock);
+	spin_lock_init(&pd->pmu_lock);
+	spin_lock_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);
-- 
1.7.9.5