[PATCH 1/3] power-domain: add power domain drivers for Rockchip platform
jinkun.hong
jinkun.hong at rock-chips.com
Mon Sep 22 19:55:14 PDT 2014
From: "jinkun.hong" <jinkun.hong at 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 at rock-chips.com>
Signed-off-by: Caesar Wang <caesar.wang at rock-chips.com>
Signed-off-by: jinkun.hong <jinkun.hong at rock-chips.com>
---
arch/arm/mach-rockchip/Kconfig | 1 +
arch/arm/mach-rockchip/Makefile | 1 +
arch/arm/mach-rockchip/pm_domains.c | 372 +++++++++++++++++++++++++++++
include/dt-bindings/power-domain/rk3288.h | 11 +
4 files changed, 385 insertions(+)
create mode 100644 arch/arm/mach-rockchip/pm_domains.c
create mode 100644 include/dt-bindings/power-domain/rk3288.h
diff --git a/arch/arm/mach-rockchip/Kconfig b/arch/arm/mach-rockchip/Kconfig
index cfe5037..02ec129 100644
--- a/arch/arm/mach-rockchip/Kconfig
+++ b/arch/arm/mach-rockchip/Kconfig
@@ -16,6 +16,7 @@ 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 4377a14..2a47343 100644
--- a/arch/arm/mach-rockchip/Makefile
+++ b/arch/arm/mach-rockchip/Makefile
@@ -1,2 +1,3 @@
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..6c2f0f7
--- /dev/null
+++ b/arch/arm/mach-rockchip/pm_domains.c
@@ -0,0 +1,372 @@
+/*
+ * Rockchip Generic power domain support.
+ *
+ * Copyright (c) 2014 ROCKCHIP, Co. Ltd.
+ * Author: Jack Dai <jack.dai at 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 <dt-bindings/power-domain/rk3288.h>
+
+struct rockchip_pm_domain {
+ u32 id;
+ int pwr_shift;
+ int status_shift;
+ int req_shift;
+ int idle_shift;
+ int ack_shift;
+ u8 num_clks;
+ struct clk **clks;
+ struct generic_pm_domain pd;
+ struct rockchip_pmu *pmu;
+};
+
+struct rockchip_pmu {
+ struct regmap *regmap_pmu;
+ u32 pwr_offset;
+ u32 status_offset;
+ u32 req_offset;
+ u32 idle_offset;
+ u32 ack_offset;
+ u8 num_pds;
+ struct rockchip_pm_domain *pds;
+ spinlock_t idle_lock;
+ spinlock_t pmu_lock;
+};
+
+#define to_rockchip_pd(_gpd) container_of(_gpd, struct rockchip_pm_domain, pd)
+
+#define DOMAIN(_id, _pwr_s, _status_s, _req_s, _idle_s, _ack_s) \
+{ \
+ .id = _id, \
+ .pwr_shift = _pwr_s, \
+ .status_shift = _status_s, \
+ .req_shift = _req_s, \
+ .idle_shift = _idle_s, \
+ .ack_shift = _ack_s, \
+}
+
+#define DOMAIN_RK3288(_id, _pwr_s, _status_s, _req_s) \
+ DOMAIN(_id, _pwr_s, _status_s, _req_s, _req_s, (_req_s+16))
+
+static struct rockchip_pm_domain *rockchip_pd_id_to_pd(struct rockchip_pmu *pmu,
+ u32 id)
+{
+ int i;
+
+ for (i = 0; i < pmu->num_pds; i++) {
+ if (pmu->pds[i].id == id)
+ return &pmu->pds[i];
+ }
+
+ return ERR_PTR(-EINVAL);
+}
+
+static int rockchip_pmu_set_idle_request(struct rockchip_pm_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->pmu->idle_lock, flags);
+
+ val = (idle) ? mask : 0;
+ regmap_update_bits(pd->pmu->regmap_pmu, pd->pmu->req_offset, mask, val);
+
+ dsb();
+
+ do {
+ regmap_read(pd->pmu->regmap_pmu, pd->pmu->ack_offset, &val);
+ } while ((val & ack_mask) != ack_target);
+
+ do {
+ regmap_read(pd->pmu->regmap_pmu, pd->pmu->idle_offset, &val);
+ } while ((val & idle_mask) != idle_target);
+
+ spin_unlock_irqrestore(&pd->pmu->idle_lock, flags);
+
+ return 0;
+}
+
+static bool rockchip_pmu_power_domain_is_on(struct rockchip_pm_domain *pd)
+{
+ unsigned int val;
+
+ regmap_read(pd->pmu->regmap_pmu, pd->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_pm_domain *pd, bool on)
+{
+ unsigned int mask = BIT(pd->pwr_shift);
+ unsigned int val;
+
+ val = (on) ? 0 : mask;
+ regmap_update_bits(pd->pmu->regmap_pmu, pd->pmu->pwr_offset, mask, val);
+
+ dsb();
+
+ do {
+ regmap_read(pd->pmu->regmap_pmu, pd->pmu->status_offset, &val);
+ } while ((val & BIT(pd->status_shift)) == on);
+}
+
+static int rockchip_pmu_set_power_domain(struct rockchip_pm_domain *pd,
+ bool on)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&pd->pmu->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->pmu_lock, flags);
+ return 0;
+}
+
+static int rockchip_pd_power(struct rockchip_pm_domain *pd, bool power_on)
+{
+ int i, ret;
+
+ for (i = 0; i < pd->num_clks; i++)
+ if (pd->clks[i])
+ clk_enable(pd->clks[i]);
+
+ ret = rockchip_pmu_set_power_domain(pd, power_on);
+
+ for (i = 0; i < pd->num_clks; i++)
+ if (pd->clks[i])
+ clk_disable(pd->clks[i]);
+
+ return ret;
+}
+
+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 void rockchip_allclk_disable_unprepare(struct rockchip_pmu *pmu)
+{
+ int i, j;
+ struct rockchip_pm_domain *pd;
+
+ for (i = 0; i < pmu->num_pds; i++) {
+ pd = rockchip_pd_id_to_pd(pmu, i);
+
+ for (j = 0; j < pd->num_clks; j++)
+ if (pd->clks[j])
+ clk_disable_unprepare(pd->clks[j]);
+ }
+}
+
+struct generic_pm_domain *of_rockchip_pd_xlate(
+ struct of_phandle_args *spec,
+ void *data)
+{
+ struct rockchip_pmu *pmu = (struct rockchip_pmu *)data;
+ struct rockchip_pm_domain *pd;
+ u32 id = spec->args[0];
+
+ if (spec->args_count != 1)
+ return ERR_PTR(-EINVAL);
+
+ pd = rockchip_pd_id_to_pd(pmu, id);
+ if (IS_ERR(pd)) {
+ pr_err("%s: invalid pd index %d\n", __func__, id);
+ return ERR_PTR(-EINVAL);
+ }
+
+ return &pd->pd;
+}
+
+static const struct of_device_id rockchip_pm_domain_dt_match[];
+
+static int rockchip_pm_domain_remove(struct platform_device *pdev)
+{
+ struct rockchip_pmu *pmu;
+ const struct of_device_id *match;
+ struct device_node *np = pdev->dev.of_node;
+
+ of_genpd_del_provider(np);
+
+ match = of_match_node(rockchip_pm_domain_dt_match, np);
+ pmu = (struct rockchip_pmu *)match->data;
+
+ rockchip_allclk_disable_unprepare(pmu);
+ return 0;
+}
+
+static int rockchip_pm_domain_probe(struct platform_device *pdev)
+{
+ struct rockchip_pmu *pmu;
+ struct rockchip_pm_domain *pd;
+ int on, cnt, i, ret;
+ struct clk *clk;
+ struct regmap *regmap_pmu;
+ struct device_node *np = pdev->dev.of_node, *node;
+ const struct of_device_id *match;
+ u32 id;
+
+ if (!np) {
+ pr_err("device tree node not found\n");
+ return -ENODEV;
+ }
+
+ match = of_match_node(rockchip_pm_domain_dt_match, np);
+ pmu = (struct rockchip_pmu *)match->data;
+
+ node = of_parse_phandle(np, "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);
+ }
+ pmu->regmap_pmu = regmap_pmu;
+ spin_lock_init(&pmu->idle_lock);
+ spin_lock_init(&pmu->pmu_lock);
+
+ for_each_available_child_of_node(np, node) {
+ ret = of_property_read_u32(node, "reg", &id);
+ if (ret != 0) {
+ pr_err("%s: failed to get id\n", __func__);
+ return -ENOMEM;
+ }
+
+ pd = rockchip_pd_id_to_pd(pmu, id);
+ if (IS_ERR(pd)) {
+ pr_err("%s: invalid pd index %d\n", __func__, id);
+ return -ENOMEM;
+ }
+
+ pd->pmu = pmu;
+
+ cnt = of_count_phandle_with_args(node, "clocks",
+ "#clock-cells");
+ if (cnt > 0) {
+ pd->clks = devm_kcalloc(&pdev->dev, cnt,
+ sizeof(struct clk *), GFP_KERNEL);
+ if (!pd->clks) {
+ pr_err("%s: failed to allocate memory for clks\n",
+ __func__);
+ return -ENOMEM;
+ }
+
+ pd->num_clks = cnt;
+
+ for (i = 0; i < cnt; i++) {
+ clk = of_clk_get(node, i);
+ if (IS_ERR(clk)) {
+ pr_err("%s: failed to get clk(index %d)\n",
+ __func__, i);
+ rockchip_allclk_disable_unprepare(pmu);
+ return -ENOMEM;
+ }
+ pd->clks[i] = clk;
+ clk_prepare_enable(clk);
+ }
+ }
+
+ pd->pd.name = node->name;
+ pd->pd.power_off = rockchip_pd_power_off;
+ pd->pd.power_on = rockchip_pd_power_on;
+ pd->pd.of_node = np;
+
+ /*FIXME*/
+ on = true;
+
+ pm_genpd_init(&pd->pd, NULL, !on);
+ }
+
+ __of_genpd_add_provider(np, of_rockchip_pd_xlate, pmu);
+
+ return 0;
+}
+
+struct rockchip_pm_domain rk3288_pm_domains[] = {
+ DOMAIN_RK3288(RK3288_PD_GPU, 9, 9, 2),
+ DOMAIN_RK3288(RK3288_PD_VIO, 7, 7, 4),
+ DOMAIN_RK3288(RK3288_PD_VIDEO, 8, 8, 3),
+ DOMAIN_RK3288(RK3288_PD_HEVC, 14, 10, 9),
+};
+
+struct rockchip_pmu rk3288_pmu = {
+ .pwr_offset = 0x08,
+ .status_offset = 0x0c,
+ .req_offset = 0x10,
+ .idle_offset = 0x14,
+ .ack_offset = 0x14,
+ .num_pds = ARRAY_SIZE(rk3288_pm_domains),
+ .pds = rk3288_pm_domains,
+};
+
+static const struct of_device_id rockchip_pm_domain_dt_match[] = {
+ { .compatible = "rockchip,rk3288-power-controller",
+ .data = (void *)&rk3288_pmu},
+ {},
+};
+MODULE_DEVICE_TABLE(of, rockchip_pm_domain_dt_match);
+
+static struct platform_driver rockchip_pm_domain_driver = {
+ .probe = rockchip_pm_domain_probe,
+ .remove = rockchip_pm_domain_remove,
+ .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);
diff --git a/include/dt-bindings/power-domain/rk3288.h b/include/dt-bindings/power-domain/rk3288.h
new file mode 100644
index 0000000..ca68c11
--- /dev/null
+++ b/include/dt-bindings/power-domain/rk3288.h
@@ -0,0 +1,11 @@
+#ifndef __DT_BINDINGS_POWER_DOMAIN_RK3288_H__
+#define __DT_BINDINGS_POWER_DOMAIN_RK3288_H__
+
+/* RK3288 power domain index */
+#define RK3288_PD_GPU 0
+#define RK3288_PD_VIO 1
+#define RK3288_PD_VIDEO 2
+#define RK3288_PD_HEVC 3
+#define RK3288_PD_PERI 4
+
+#endif
--
1.7.9.5
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