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Subject[PATCH v5 4/5] ARM: EXYNOS: Add platform driver support for Exynos PMU
Date
This patch modifies Exynos Power Management Unit (PMU) initialization
implementation in following way:

- Added platform driver support and probe function where Exynos PMU
driver will register itself as syscon provider with syscon framework.
- Added platform struct exynos_pmu_data to hold platform specific data.
- For each SoC's PMU support now we can add platform data and statically
bind PMU configuration and SoC specific initialization function.
- Separate each SoC's PMU initialization function and make it as part of
platform data.
- It also removes uses of soc_is_exynosXYZ().

Signed-off-by: Pankaj Dubey <pankaj.dubey@samsung.com>
---
arch/arm/mach-exynos/Kconfig | 1 +
arch/arm/mach-exynos/pmu.c | 201 +++++++++++++++++++++++++++++++++---------
2 files changed, 161 insertions(+), 41 deletions(-)

diff --git a/arch/arm/mach-exynos/Kconfig b/arch/arm/mach-exynos/Kconfig
index d58995c9..c4320e6 100644
--- a/arch/arm/mach-exynos/Kconfig
+++ b/arch/arm/mach-exynos/Kconfig
@@ -25,6 +25,7 @@ config ARCH_EXYNOS
select PM_GENERIC_DOMAINS if PM_RUNTIME
select S5P_DEV_MFC
select SRAM
+ select MFD_SYSCON
help
Support for SAMSUNG EXYNOS SoCs (EXYNOS4/5)

diff --git a/arch/arm/mach-exynos/pmu.c b/arch/arm/mach-exynos/pmu.c
index a6f034c..c80a648 100644
--- a/arch/arm/mach-exynos/pmu.c
+++ b/arch/arm/mach-exynos/pmu.c
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2011-2012 Samsung Electronics Co., Ltd.
+ * Copyright (c) 2011-2014 Samsung Electronics Co., Ltd.
* http://www.samsung.com/
*
* EXYNOS - CPU PMU(Power Management Unit) support
@@ -9,13 +9,32 @@
* published by the Free Software Foundation.
*/

+#include <linux/module.h>
#include <linux/io.h>
-#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>

#include "common.h"
#include "regs-pmu.h"

-static const struct exynos_pmu_conf *exynos_pmu_config;
+struct exynos_pmu_data {
+ const struct exynos_pmu_conf *pmu_config;
+ const struct exynos_pmu_conf *pmu_config_extra;
+
+ void (*pmu_init)(void);
+ void (*powerdown_conf)(enum sys_powerdown);
+};
+
+struct exynos_pmu_context {
+ struct device *dev;
+ struct exynos_pmu_data *pmu_data;
+};
+
+static void __iomem *pmu_base_addr;
+static struct exynos_pmu_context *pmu_context;

static const struct exynos_pmu_conf exynos4210_pmu_config[] = {
/* { .offset = offset, .val = { AFTR, LPA, SLEEP } */
@@ -93,7 +112,7 @@ static const struct exynos_pmu_conf exynos4210_pmu_config[] = {
{ PMU_TABLE_END,},
};

-static const struct exynos_pmu_conf exynos4x12_pmu_config[] = {
+static const struct exynos_pmu_conf exynos4212_pmu_config[] = {
{ S5P_ARM_CORE0_LOWPWR, { 0x0, 0x0, 0x2 } },
{ S5P_DIS_IRQ_CORE0, { 0x0, 0x0, 0x0 } },
{ S5P_DIS_IRQ_CENTRAL0, { 0x0, 0x0, 0x0 } },
@@ -335,7 +354,7 @@ static unsigned int const exynos5_list_diable_wfi_wfe[] = {
EXYNOS5_ISP_ARM_OPTION,
};

-static void exynos5_init_pmu(void)
+static void exynos5_powerdown_conf(enum sys_powerdown mode)
{
unsigned int i;
unsigned int tmp;
@@ -372,51 +391,151 @@ void exynos_sys_powerdown_conf(enum sys_powerdown mode)
{
unsigned int i;

- if (soc_is_exynos5250())
- exynos5_init_pmu();
+ struct exynos_pmu_data *pmu_data = pmu_context->pmu_data;
+
+ if (!pmu_data)
+ return;

- for (i = 0; (exynos_pmu_config[i].offset != PMU_TABLE_END) ; i++)
- __raw_writel(exynos_pmu_config[i].val[mode],
- pmu_base_addr + exynos_pmu_config[i].offset);
+ if (pmu_data->powerdown_conf)
+ pmu_data->powerdown_conf(mode);

- if (soc_is_exynos4412()) {
- for (i = 0; exynos4412_pmu_config[i].offset != PMU_TABLE_END ; i++)
- __raw_writel(exynos4412_pmu_config[i].val[mode],
- pmu_base_addr + exynos4412_pmu_config[i].offset);
+ if (pmu_data->pmu_config) {
+ for (i = 0; (pmu_data->pmu_config[i].offset != PMU_TABLE_END) ; i++)
+ __raw_writel(pmu_data->pmu_config[i].val[mode],
+ pmu_base_addr + pmu_data->pmu_config[i].offset);
+ }
+
+ if (pmu_data->pmu_config_extra) {
+ for (i = 0; pmu_data->pmu_config_extra[i].offset != PMU_TABLE_END; i++)
+ __raw_writel(pmu_data->pmu_config_extra[i].val[mode],
+ pmu_base_addr + pmu_data->pmu_config_extra[i].offset);
}
}

-static int __init exynos_pmu_init(void)
+static void exynos5250_pmu_init(void)
{
unsigned int value;
+ /*
+ * When SYS_WDTRESET is set, watchdog timer reset request
+ * is ignored by power management unit.
+ */
+ value = __raw_readl(pmu_base_addr + EXYNOS5_AUTO_WDTRESET_DISABLE);
+ value &= ~EXYNOS5_SYS_WDTRESET;
+ __raw_writel(value, pmu_base_addr + EXYNOS5_AUTO_WDTRESET_DISABLE);
+
+ value = __raw_readl(pmu_base_addr + EXYNOS5_MASK_WDTRESET_REQUEST);
+ value &= ~EXYNOS5_SYS_WDTRESET;
+ __raw_writel(value, pmu_base_addr + EXYNOS5_MASK_WDTRESET_REQUEST);
+}
+
+static struct exynos_pmu_data exynos4210_pmu_data = {
+ .pmu_config = exynos4210_pmu_config,
+};
+
+static struct exynos_pmu_data exynos4212_pmu_data = {
+ .pmu_config = exynos4212_pmu_config,
+};
+
+static struct exynos_pmu_data exynos4412_pmu_data = {
+ .pmu_config = exynos4212_pmu_config,
+ .pmu_config_extra = exynos4412_pmu_config,
+};
+
+static struct exynos_pmu_data exynos5250_pmu_data = {
+ .pmu_config = exynos5250_pmu_config,
+ .pmu_init = exynos5250_pmu_init,
+ .powerdown_conf = exynos5_powerdown_conf,
+};

- exynos_pmu_config = exynos4210_pmu_config;
-
- if (soc_is_exynos4210()) {
- exynos_pmu_config = exynos4210_pmu_config;
- pr_info("EXYNOS4210 PMU Initialize\n");
- } else if (soc_is_exynos4212() || soc_is_exynos4412()) {
- exynos_pmu_config = exynos4x12_pmu_config;
- pr_info("EXYNOS4x12 PMU Initialize\n");
- } else if (soc_is_exynos5250()) {
- /*
- * When SYS_WDTRESET is set, watchdog timer reset request
- * is ignored by power management unit.
- */
- value = __raw_readl(pmu_base_addr + EXYNOS5_AUTO_WDTRESET_DISABLE);
- value &= ~EXYNOS5_SYS_WDTRESET;
- __raw_writel(value, pmu_base_addr + EXYNOS5_AUTO_WDTRESET_DISABLE);
-
- value = __raw_readl(pmu_base_addr + EXYNOS5_MASK_WDTRESET_REQUEST);
- value &= ~EXYNOS5_SYS_WDTRESET;
- __raw_writel(value, pmu_base_addr + EXYNOS5_MASK_WDTRESET_REQUEST);
-
- exynos_pmu_config = exynos5250_pmu_config;
- pr_info("EXYNOS5250 PMU Initialize\n");
- } else {
- pr_info("EXYNOS: PMU not supported\n");
+static struct regmap_config pmu_regmap_config = {
+ .reg_bits = 32,
+ .val_bits = 32,
+ .reg_stride = 4,
+};
+
+/*
+ * PMU platform driver and devicetree bindings.
+ */
+static struct of_device_id exynos_pmu_of_device_ids[] = {
+ {
+ .compatible = "samsung,exynos4210-pmu",
+ .data = (void *)&exynos4210_pmu_data,
+ },
+ {
+ .compatible = "samsung,exynos4212-pmu",
+ .data = (void *)&exynos4212_pmu_data,
+ },
+ {
+ .compatible = "samsung,exynos4412-pmu",
+ .data = (void *)&exynos4412_pmu_data,
+ },
+ {
+ .compatible = "samsung,exynos5250-pmu",
+ .data = (void *)&exynos5250_pmu_data,
+ },
+ {},
+};
+
+static int exynos_pmu_probe(struct platform_device *pdev)
+{
+ const struct of_device_id *match;
+ struct device *dev = &pdev->dev;
+ struct regmap *regmap;
+ struct resource *res;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENOENT;
+
+ pmu_base_addr = devm_ioremap(dev, res->start, resource_size(res));
+ if (IS_ERR(pmu_base_addr))
+ return PTR_ERR(pmu_base_addr);
+
+ pmu_context = devm_kzalloc(&pdev->dev,
+ sizeof(struct exynos_pmu_context),
+ GFP_KERNEL);
+
+ if (pmu_context == NULL) {
+ dev_err(dev, "Cannot allocate memory.\n");
+ return -ENOMEM;
+ }
+
+ regmap = devm_regmap_init_mmio(dev, pmu_base_addr,
+ &pmu_regmap_config);
+ if (IS_ERR(regmap)) {
+ dev_err(dev, "regmap init failed\n");
+ return PTR_ERR(regmap);
}

+ devm_syscon_register(dev, regmap);
+
+ match = of_match_node(exynos_pmu_of_device_ids, pdev->dev.of_node);
+
+ pmu_context->pmu_data = (struct exynos_pmu_data *) match->data;
+
+ if (pmu_context->pmu_data && pmu_context->pmu_data->pmu_init)
+ pmu_context->pmu_data->pmu_init();
+
+ pmu_context->dev = dev;
+
+ platform_set_drvdata(pdev, pmu_context);
+
+ pr_info("Exynos PMU Driver probe done!!!\n");
return 0;
}
-arch_initcall(exynos_pmu_init);
+
+static struct platform_driver exynos_pmu_driver = {
+ .driver = {
+ .name = "exynos-pmu",
+ .owner = THIS_MODULE,
+ .of_match_table = exynos_pmu_of_device_ids,
+ },
+ .probe = exynos_pmu_probe,
+};
+
+static int __init exynos_pmu_init(void)
+{
+ return platform_driver_register(&exynos_pmu_driver);
+
+}
+postcore_initcall(exynos_pmu_init);
--
1.7.9.5


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