[PATCH v2 10/10] ARM: EXYNOS: Add device tree based initialization support for PMU.
From: Pankaj Dubey
Date: Fri Apr 25 2014 - 08:18:51 EST
This patch adds device tree based initialization for PMU and modifies
PMU initialization implementation in following way:
1: Let's initialize PMU based on device tree compatibility string.
2: Obtain PMU regmap handle using "syscon_early_regmap_lookup_by_phandle"
so that we can reduce dependency over machine header files.
3: Separate each SoC's PMU initialization function and bind this initialization
function with PMU compatibility string.
4 : It also removes uses of soc_is_exynosXXXX() thus making PMU implementation
independent of "plat/cpu.h".
Signed-off-by: Pankaj Dubey <pankaj.dubey@xxxxxxxxxxx>
Signed-off-by: Young-Gun Jang <yg1004.jang@xxxxxxxxxxx>
---
arch/arm/mach-exynos/pmu.c | 182 +++++++++++++++++++++++++++++++++-----------
1 file changed, 138 insertions(+), 44 deletions(-)
diff --git a/arch/arm/mach-exynos/pmu.c b/arch/arm/mach-exynos/pmu.c
index 67116a5..abcf753 100644
--- a/arch/arm/mach-exynos/pmu.c
+++ b/arch/arm/mach-exynos/pmu.c
@@ -9,17 +9,31 @@
* published by the Free Software Foundation.
*/
-#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/regmap.h>
-
-#include <plat/cpu.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/mfd/syscon.h>
#include "common.h"
#include "regs-pmu.h"
+enum exynos_pmu_id {
+ PMU_EXYNOS4210,
+ PMU_EXYNOS4X12,
+ PMU_EXYNOS4412,
+ PMU_EXYNOS5250,
+};
+
+struct exynos_pmu_data {
+ enum exynos_pmu_id pmu_id;
+ struct regmap *pmu_regmap;
+};
+
+struct exynos_pmu_data *pmu_data;
static const struct exynos_pmu_conf *exynos_pmu_config;
-static struct regmap *pmu_regmap;
+typedef void (*exynos_pmu_init_t)(void);
static const struct exynos_pmu_conf exynos4210_pmu_config[] = {
/* { .reg = address, .val = { AFTR, LPA, SLEEP } */
@@ -348,28 +362,31 @@ 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++) {
- regmap_read(pmu_regmap, exynos5_list_both_cnt_feed[i], &tmp);
+ regmap_read(pmu_data->pmu_regmap,
+ exynos5_list_both_cnt_feed[i], &tmp);
tmp |= (EXYNOS5_USE_SC_FEEDBACK |
EXYNOS5_USE_SC_COUNTER);
- regmap_write(pmu_regmap, exynos5_list_both_cnt_feed[i], tmp);
+ regmap_write(pmu_data->pmu_regmap,
+ exynos5_list_both_cnt_feed[i], tmp);
}
/*
* SKIP_DEACTIVATE_ACEACP_IN_PWDN_BITFIELD Enable
*/
- regmap_read(pmu_regmap, EXYNOS5_ARM_COMMON_OPTION, &tmp);
+ regmap_read(pmu_data->pmu_regmap, EXYNOS5_ARM_COMMON_OPTION, &tmp);
tmp |= EXYNOS5_SKIP_DEACTIVATE_ACEACP_IN_PWDN;
- regmap_write(pmu_regmap, EXYNOS5_ARM_COMMON_OPTION, tmp);
+ regmap_write(pmu_data->pmu_regmap, EXYNOS5_ARM_COMMON_OPTION, tmp);
/*
* Disable WFI/WFE on XXX_OPTION
*/
for (i = 0 ; i < ARRAY_SIZE(exynos5_list_diable_wfi_wfe) ; i++) {
- tmp = regmap_read(pmu_regmap, exynos5_list_diable_wfi_wfe[i],
- &tmp);
+ tmp = regmap_read(pmu_data->pmu_regmap,
+ exynos5_list_diable_wfi_wfe[i], &tmp);
tmp &= ~(EXYNOS5_OPTION_USE_STANDBYWFE |
EXYNOS5_OPTION_USE_STANDBYWFI);
- regmap_write(pmu_regmap, exynos5_list_diable_wfi_wfe[i], tmp);
+ regmap_write(pmu_data->pmu_regmap,
+ exynos5_list_diable_wfi_wfe[i], tmp);
}
}
@@ -377,52 +394,129 @@ void exynos_sys_powerdown_conf(enum sys_powerdown mode)
{
unsigned int i;
- if (soc_is_exynos5250())
+ if (pmu_data->pmu_id == PMU_EXYNOS5250)
exynos5_init_pmu();
for (i = 0; (exynos_pmu_config[i].offset != PMU_TABLE_END) ; i++)
- regmap_write(pmu_regmap, exynos_pmu_config[i].offset,
+ regmap_write(pmu_data->pmu_regmap, exynos_pmu_config[i].offset,
exynos_pmu_config[i].val[mode]);
- if (soc_is_exynos4412()) {
+ if (pmu_data->pmu_id == PMU_EXYNOS4412) {
for (i = 0; exynos4412_pmu_config[i].offset != PMU_TABLE_END; i++)
- regmap_write(pmu_regmap, exynos4412_pmu_config[i].offset,
+ regmap_write(pmu_data->pmu_regmap,
+ exynos4412_pmu_config[i].offset,
exynos4412_pmu_config[i].val[mode]);
}
}
-static int __init exynos_pmu_init(void)
+static void exynos4210_pmu_init(void)
{
- unsigned int value;
-
exynos_pmu_config = exynos4210_pmu_config;
- pmu_regmap = get_exynos_pmuregmap();
-
- 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.
- */
- regmap_read(pmu_regmap, EXYNOS5_AUTO_WDTRESET_DISABLE, &value);
- value &= ~EXYNOS5_SYS_WDTRESET;
- regmap_write(pmu_regmap, EXYNOS5_AUTO_WDTRESET_DISABLE, value);
-
- regmap_read(pmu_regmap, EXYNOS5_MASK_WDTRESET_REQUEST, &value);
- value &= ~EXYNOS5_SYS_WDTRESET;
- regmap_write(pmu_regmap, EXYNOS5_MASK_WDTRESET_REQUEST, value);
-
- exynos_pmu_config = exynos5250_pmu_config;
- pr_info("EXYNOS5250 PMU Initialize\n");
- } else {
- pr_info("EXYNOS: PMU not supported\n");
+ pmu_data->pmu_id = PMU_EXYNOS4210;
+
+ pr_info("EXYNOS4210 PMU Initialize\n");
+}
+
+static void exynos4x12_pmu_init(void)
+{
+ exynos_pmu_config = exynos4x12_pmu_config;
+ pmu_data->pmu_id = PMU_EXYNOS4X12;
+
+ pr_info("EXYNOS4x12 PMU Initialize\n");
+}
+
+static void exynos4412_pmu_init(void)
+{
+ exynos_pmu_config = exynos4x12_pmu_config;
+ pmu_data->pmu_id = PMU_EXYNOS4412;
+
+ pr_info("EXYNOS4412 PMU Initialize\n");
+}
+
+static void exynos5250_pmu_init(void)
+{
+ unsigned int tmp;
+
+ /*
+ * When SYS_WDTRESET is set, watchdog timer reset request
+ * is ignored by power management unit.
+ */
+ regmap_read(pmu_data->pmu_regmap, EXYNOS5_AUTO_WDTRESET_DISABLE, &tmp);
+ tmp &= ~EXYNOS5_SYS_WDTRESET;
+ regmap_write(pmu_data->pmu_regmap, EXYNOS5_AUTO_WDTRESET_DISABLE, tmp);
+
+ regmap_read(pmu_data->pmu_regmap, EXYNOS5_MASK_WDTRESET_REQUEST, &tmp);
+ tmp &= ~EXYNOS5_SYS_WDTRESET;
+ regmap_write(pmu_data->pmu_regmap, EXYNOS5_MASK_WDTRESET_REQUEST, tmp);
+
+ exynos_pmu_config = exynos5250_pmu_config;
+ pmu_data->pmu_id = PMU_EXYNOS5250;
+
+ pr_info("EXYNOS5250 PMU Initialize\n");
+}
+
+/*
+ * PMU platform driver and devicetree bindings.
+ */
+static struct of_device_id exynos_pmu_of_device_ids[] = {
+ {
+ .compatible = "samsung,exynos4210-pmu",
+ .data = (void *)exynos4210_pmu_init
+ },
+ {
+ .compatible = "samsung,exynos4212-pmu",
+ .data = (void *)exynos4x12_pmu_init
+ },
+ {
+ .compatible = "samsung,exynos4412-pmu",
+ .data = (void *)exynos4412_pmu_init
+ },
+ {
+ .compatible = "samsung,exynos5250-pmu",
+ .data = (void *)exynos5250_pmu_init
+ },
+ {},
+};
+
+static int exynos_pmu_probe(struct device_node *np)
+{
+ const struct of_device_id *match;
+ exynos_pmu_init_t exynos_pmu_init;
+
+ pmu_data = kzalloc(sizeof(struct exynos_pmu_data), GFP_KERNEL);
+ if (!pmu_data) {
+ pr_err("exynos_pmu driver probe failed\n");
+ return -ENOMEM;
}
+ match = of_match_node(exynos_pmu_of_device_ids, np);
+ if (!match) {
+ pr_err("fail to get matching of_match struct\n");
+ return -EINVAL;
+ }
+
+ exynos_pmu_init = match->data;
+
+ pmu_data->pmu_regmap = syscon_early_regmap_lookup_by_phandle(np,
+ "samsung,syscon-phandle");
+ if (IS_ERR(pmu_data->pmu_regmap)) {
+ pr_err("failed to find exynos_pmu_regmap\n");
+ return PTR_ERR(pmu_data->pmu_regmap);
+ }
+
+ exynos_pmu_init();
+
return 0;
+};
+
+static int __init exynos_pmu_of_init(void)
+{
+ int ret = 0;
+ struct device_node *np;
+
+ for_each_matching_node_and_match(np, exynos_pmu_of_device_ids, NULL)
+ ret = exynos_pmu_probe(np);
+
+ return ret ? ret:0;
}
-arch_initcall(exynos_pmu_init);
+arch_initcall(exynos_pmu_of_init);
--
1.7.10.4
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