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From bf20be14fc1b3f7e096bdac9c5ff67362b391479 Mon Sep 17 00:00:00 2001
From: Yuichi Kusakabe <yuichi.kusakabe@jp.fujitsu.com>
Date: Thu, 18 May 2017 17:46:24 +0900
Subject: [PATCH 12/15] Add rcar-gpio hibernation code
Signed-off-by: Yuichi Kusakabe <yuichi.kusakabe@jp.fujitsu.com>
---
drivers/pinctrl/sh-pfc/core.c | 141 +++++++++++++++++++++++++++++++++++++++---
drivers/pinctrl/sh-pfc/core.h | 4 ++
2 files changed, 138 insertions(+), 7 deletions(-)
diff --git a/drivers/pinctrl/sh-pfc/core.c b/drivers/pinctrl/sh-pfc/core.c
index b9e025d..c37418e 100644
--- a/drivers/pinctrl/sh-pfc/core.c
+++ b/drivers/pinctrl/sh-pfc/core.c
@@ -24,6 +24,7 @@
#include <linux/pinctrl/machine.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
+#include <linux/cpu_pm.h>
#include "core.h"
@@ -201,19 +202,117 @@ static void sh_pfc_config_reg_helper(struct sh_pfc *pfc,
}
}
+#ifdef CONFIG_CPU_PM
+struct reg_record {
+ void __iomem *reg;
+ unsigned long width;
+ unsigned long data;
+};
+
+struct reg_config {
+ bool unlock;
+ struct reg_record unlock_reg;
+ struct reg_record actual_reg;
+ struct list_head list;
+};
+
+static struct reg_config *regs_list;
+
+struct reg_range {
+ int start;
+ int end;
+};
+
+static int sh_pfc_cpu_pm_notify(struct notifier_block *self,
+ unsigned long action, void *hcpu)
+{
+ struct reg_config *tmp = NULL;
+ struct sh_pfc *pfc = container_of(self, struct sh_pfc, pm_notify);
+ /* We don't setup pinmux in kernel - store all registers */
+ struct reg_range ranges[] = {
+ {0x0, 0x5c}, {0x160, 0x160}, {0x90, 0x98},
+ {0x100, 0x118}, {0x70, 0x70}, {0x60, 0x64},
+ {0x84, 0x8c}, {0x240, 0x248},
+ };
+
+ if (action == CPU_PM_ENTER) {
+ if (!regs_list) {
+ /* No pinmux configuration, storing all registers */
+ int store_cnt = 0;
+ int i;
+ for (i = 0; i < ARRAY_SIZE(ranges); i++) {
+ int j;
+ for (j = ranges[i].start; j <= ranges[i].end; j += sizeof(u32)) {
+ pfc->stored_regs[store_cnt] =
+ sh_pfc_read_raw_reg(sh_pfc_phys_to_virt(pfc, 0xe6060000 + j), 32);
+ pr_debug("PFC: %08x => %08x\n", 0xe6060000 + j, pfc->stored_regs[store_cnt]);
+ store_cnt++;
+ if (store_cnt >= ARRAY_SIZE(pfc->stored_regs)) {
+ pr_err("read: Register store overflow\n");
+ goto out;
+ }
+ }
+ }
+ }
+ } else if (action == CPU_PM_ENTER_FAILED || action == CPU_PM_EXIT) {
+ if (!regs_list) {
+ /* No list, restoring all registers */
+ int store_cnt = 0;
+ int i;
+ for (i = 0; i < ARRAY_SIZE(ranges); i++) {
+ int j;
+ for (j = ranges[i].start; j <= ranges[i].end; j += sizeof(u32)) {
+ sh_pfc_write_raw_reg(sh_pfc_phys_to_virt(pfc, 0xe6060000 + j), 32,
+ pfc->stored_regs[store_cnt]);
+ pr_debug("PFC: %08x => %08x\n", 0xe6060000 + j, pfc->stored_regs[store_cnt]);
+ store_cnt++;
+ if (store_cnt >= ARRAY_SIZE(pfc->stored_regs)) {
+ pr_err("write: Register store overflow\n");
+ goto out;
+ }
+ }
+ }
+ goto out;
+ }
+ list_for_each_entry(tmp , &(regs_list->list), list) {
+ if (tmp->unlock)
+ sh_pfc_write_raw_reg(tmp->unlock_reg.reg,
+ tmp->unlock_reg.width,
+ tmp->unlock_reg.data);
+ sh_pfc_write_raw_reg(tmp->actual_reg.reg,
+ tmp->actual_reg.width,
+ tmp->actual_reg.data);
+ }
+ }
+out:
+ return NOTIFY_OK;
+}
+
+static int __init sh_pfc_cpu_pm_init(struct sh_pfc *pfc)
+{
+ memset(&pfc->pm_notify, 0, sizeof(pfc->pm_notify));
+ pfc->pm_notify.notifier_call = sh_pfc_cpu_pm_notify;
+ return cpu_pm_register_notifier(&pfc->pm_notify);
+}
+#else
+static int __init sh_pfc_cpu_pm_init(struct sh_pfc *pfc)
+{
+ return 0;
+}
+#endif
+
+
static void sh_pfc_write_config_reg(struct sh_pfc *pfc,
const struct pinmux_cfg_reg *crp,
unsigned long field, unsigned long value)
{
void __iomem *mapped_reg;
unsigned long mask, pos, data;
-
+#ifdef CONFIG_CPU_PM
+ struct reg_config *tmp;
+#endif
sh_pfc_config_reg_helper(pfc, crp, field, &mapped_reg, &mask, &pos);
- dev_dbg(pfc->dev, "write_reg addr = %lx, value = %ld, field = %ld, "
- "r_width = %ld, f_width = %ld\n",
- crp->reg, value, field, crp->reg_width, crp->field_width);
-
mask = ~(mask << pos);
value = value << pos;
@@ -221,14 +320,39 @@ static void sh_pfc_write_config_reg(struct sh_pfc *pfc,
data &= mask;
data |= value;
- if (pfc->info->unlock_reg)
+#ifdef CONFIG_CPU_PM
+ tmp = kzalloc(sizeof(struct reg_config), GFP_KERNEL);
+ BUG_ON(!tmp);
+
+ if (!regs_list) {
+ regs_list = tmp;
+ INIT_LIST_HEAD(®s_list->list);
+ }
+#endif
+
+ if (pfc->info->unlock_reg) {
+#ifdef CONFIG_CPU_PM
+ tmp->unlock = true;
+ tmp->unlock_reg.reg = sh_pfc_phys_to_virt(pfc,
+ pfc->info->unlock_reg);
+ tmp->unlock_reg.width = 32;
+ tmp->unlock_reg.data = ~data;
+#endif
sh_pfc_write_raw_reg(
sh_pfc_phys_to_virt(pfc, pfc->info->unlock_reg), 32,
~data);
+ }
+
+#ifdef CONFIG_CPU_PM
+ tmp->actual_reg.reg = mapped_reg;
+ tmp->actual_reg.width = crp->reg_width;
+ tmp->actual_reg.data = data;
+
+ list_add(&tmp->list, ®s_list->list);
+#endif
sh_pfc_write_raw_reg(mapped_reg, crp->reg_width, data);
}
-
static int sh_pfc_get_config_reg(struct sh_pfc *pfc, u16 enum_id,
const struct pinmux_cfg_reg **crp, int *fieldp,
int *valuep)
@@ -574,6 +698,8 @@ static int sh_pfc_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, pfc);
+ sh_pfc_cpu_pm_init(pfc);
+
dev_info(pfc->dev, "%s support registered\n", info->name);
return 0;
@@ -596,6 +722,7 @@ static int sh_pfc_remove(struct platform_device *pdev)
if (pfc->info->ops && pfc->info->ops->exit)
pfc->info->ops->exit(pfc);
+
return 0;
}
diff --git a/drivers/pinctrl/sh-pfc/core.h b/drivers/pinctrl/sh-pfc/core.h
index 75ecb67..5471a6c 100644
--- a/drivers/pinctrl/sh-pfc/core.h
+++ b/drivers/pinctrl/sh-pfc/core.h
@@ -14,6 +14,7 @@
#include <linux/compiler.h>
#include <linux/spinlock.h>
#include <linux/types.h>
+#include <linux/notifier.h>
#include "sh_pfc.h"
@@ -51,6 +52,9 @@ struct sh_pfc {
struct sh_pfc_chip *func;
struct sh_pfc_pinctrl *pinctrl;
+ struct notifier_block pm_notify;
+#define STORE_REGS_COUNT 50
+ u32 stored_regs[STORE_REGS_COUNT];
};
int sh_pfc_register_gpiochip(struct sh_pfc *pfc);
--
1.8.3.1
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