ARM: EXYNOS: Add platform driver support for Exynos PMU

This patch modifies Exynos Power Management Unit (PMU) initialization
implementation in following way:

- Added platform driver support for Exynos PMU IP.
- 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>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

diff --git a/arch/arm/mach-exynos/Kconfig b/arch/arm/mach-exynos/Kconfig
index 349c867..b9e3f1c 100644 (file)
--- a/arch/arm/mach-exynos/Kconfig
+++ b/arch/arm/mach-exynos/Kconfig
@@ -24,6 +24,7 @@ menuconfig 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 e5e1846..24cd4c4 100644 (file)
--- 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
@@ -10,12 +10,26 @@
  */
 
 #include <linux/io.h>
-#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/platform_device.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;
+       const struct exynos_pmu_data *pmu_data;
+};
+
+static struct exynos_pmu_context *pmu_context;
 
 static const struct exynos_pmu_conf exynos4210_pmu_config[] = {
        /* { .offset = offset, .val = { AFTR, LPA, SLEEP } */
@@ -336,7 +350,7 @@ static unsigned int const exynos5_list_disable_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;
@@ -344,7 +358,7 @@ static void exynos5_init_pmu(void)
        /*
         * Enable both SC_FEEDBACK and SC_COUNTER
         */
-       for (i = 0 ; i < ARRAY_SIZE(exynos5_list_both_cnt_feed) ; i++) {
+       for (i = 0; i < ARRAY_SIZE(exynos5_list_both_cnt_feed); i++) {
                tmp = pmu_raw_readl(exynos5_list_both_cnt_feed[i]);
                tmp |= (EXYNOS5_USE_SC_FEEDBACK |
                        EXYNOS5_USE_SC_COUNTER);
@@ -361,7 +375,7 @@ static void exynos5_init_pmu(void)
        /*
         * Disable WFI/WFE on XXX_OPTION
         */
-       for (i = 0 ; i < ARRAY_SIZE(exynos5_list_disable_wfi_wfe) ; i++) {
+       for (i = 0; i < ARRAY_SIZE(exynos5_list_disable_wfi_wfe); i++) {
                tmp = pmu_raw_readl(exynos5_list_disable_wfi_wfe[i]);
                tmp &= ~(EXYNOS5_OPTION_USE_STANDBYWFE |
                         EXYNOS5_OPTION_USE_STANDBYWFI);
@@ -373,51 +387,124 @@ void exynos_sys_powerdown_conf(enum sys_powerdown mode)
 {
        unsigned int i;
 
-       if (soc_is_exynos5250())
-               exynos5_init_pmu();
+       const struct exynos_pmu_data *pmu_data = pmu_context->pmu_data;
 
-       for (i = 0; (exynos_pmu_config[i].offset != PMU_TABLE_END) ; i++)
-               pmu_raw_writel(exynos_pmu_config[i].val[mode],
-                               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++)
-                       pmu_raw_writel(exynos4412_pmu_config[i].val[mode],
-                                       exynos4412_pmu_config[i].offset);
+       if (pmu_data->pmu_config) {
+               for (i = 0; (pmu_data->pmu_config[i].offset != PMU_TABLE_END); i++)
+                       pmu_raw_writel(pmu_data->pmu_config[i].val[mode],
+                                       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++)
+                       pmu_raw_writel(pmu_data->pmu_config_extra[i].val[mode],
+                                       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 = pmu_raw_readl(EXYNOS5_AUTO_WDTRESET_DISABLE);
+       value &= ~EXYNOS5_SYS_WDTRESET;
+       pmu_raw_writel(value, EXYNOS5_AUTO_WDTRESET_DISABLE);
+
+       value = pmu_raw_readl(EXYNOS5_MASK_WDTRESET_REQUEST);
+       value &= ~EXYNOS5_SYS_WDTRESET;
+       pmu_raw_writel(value, EXYNOS5_MASK_WDTRESET_REQUEST);
+}
+
+static const struct exynos_pmu_data exynos4210_pmu_data = {
+       .pmu_config     = exynos4210_pmu_config,
+};
+
+static const struct exynos_pmu_data exynos4212_pmu_data = {
+       .pmu_config     = exynos4x12_pmu_config,
+};
+
+static const struct exynos_pmu_data exynos4412_pmu_data = {
+       .pmu_config             = exynos4x12_pmu_config,
+       .pmu_config_extra       = exynos4412_pmu_config,
+};
+
+static const struct exynos_pmu_data exynos5250_pmu_data = {
+       .pmu_config     = exynos5250_pmu_config,
+       .pmu_init       = exynos5250_pmu_init,
+       .powerdown_conf = exynos5_powerdown_conf,
+};
+
+/*
+ * PMU platform driver and devicetree bindings.
+ */
+static const struct of_device_id exynos_pmu_of_device_ids[] = {
+       {
+               .compatible = "samsung,exynos4210-pmu",
+               .data = &exynos4210_pmu_data,
+       }, {
+               .compatible = "samsung,exynos4212-pmu",
+               .data = &exynos4212_pmu_data,
+       }, {
+               .compatible = "samsung,exynos4412-pmu",
+               .data = &exynos4412_pmu_data,
+       }, {
+               .compatible = "samsung,exynos5250-pmu",
+               .data = &exynos5250_pmu_data,
+       },
+       { /*sentinel*/ },
+};
 
-       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 = pmu_raw_readl(EXYNOS5_AUTO_WDTRESET_DISABLE);
-               value &= ~EXYNOS5_SYS_WDTRESET;
-               pmu_raw_writel(value, EXYNOS5_AUTO_WDTRESET_DISABLE);
-
-               value = pmu_raw_readl(EXYNOS5_MASK_WDTRESET_REQUEST);
-               value &= ~EXYNOS5_SYS_WDTRESET;
-               pmu_raw_writel(value, 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 int exynos_pmu_probe(struct platform_device *pdev)
+{
+       const struct of_device_id *match;
+       struct device *dev = &pdev->dev;
+       struct resource *res;
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       pmu_base_addr = devm_ioremap_resource(dev, 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) {
+               dev_err(dev, "Cannot allocate memory.\n");
+               return -ENOMEM;
        }
+       pmu_context->dev = dev;
+
+       match = of_match_node(exynos_pmu_of_device_ids, dev->of_node);
+
+       pmu_context->pmu_data = match->data;
 
+       if (pmu_context->pmu_data->pmu_init)
+               pmu_context->pmu_data->pmu_init();
+
+       platform_set_drvdata(pdev, pmu_context);
+
+       dev_dbg(dev, "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);