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Subject[PATCH V1 02/12] pinctrl: tegra: add suspend and resume support
Date
This patch adds suspend and resume support for Tegra pinctrl driver
and registers them to syscore so the pinmux settings are restored
before the devices resume.

Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
---
drivers/pinctrl/tegra/pinctrl-tegra.c | 68 +++++++++++++++++++++++++++++++-
drivers/pinctrl/tegra/pinctrl-tegra.h | 3 ++
drivers/pinctrl/tegra/pinctrl-tegra114.c | 1 +
drivers/pinctrl/tegra/pinctrl-tegra124.c | 1 +
drivers/pinctrl/tegra/pinctrl-tegra20.c | 1 +
drivers/pinctrl/tegra/pinctrl-tegra210.c | 1 +
drivers/pinctrl/tegra/pinctrl-tegra30.c | 1 +
7 files changed, 75 insertions(+), 1 deletion(-)

diff --git a/drivers/pinctrl/tegra/pinctrl-tegra.c b/drivers/pinctrl/tegra/pinctrl-tegra.c
index a5008c066bac..585debbc4291 100644
--- a/drivers/pinctrl/tegra/pinctrl-tegra.c
+++ b/drivers/pinctrl/tegra/pinctrl-tegra.c
@@ -28,11 +28,18 @@
#include <linux/pinctrl/pinmux.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/slab.h>
+#include <linux/syscore_ops.h>

#include "../core.h"
#include "../pinctrl-utils.h"
#include "pinctrl-tegra.h"

+#define EMMC2_PAD_CFGPADCTRL_0 0x1c8
+#define EMMC4_PAD_CFGPADCTRL_0 0x1e0
+#define EMMC_DPD_PARKING (0x1FFF << 14)
+
+static struct tegra_pmx *pmx;
+
static inline u32 pmx_readl(struct tegra_pmx *pmx, u32 bank, u32 reg)
{
return readl(pmx->regs[bank] + reg);
@@ -629,6 +636,50 @@ static void tegra_pinctrl_clear_parked_bits(struct tegra_pmx *pmx)
}
}

+static int __maybe_unused tegra_pinctrl_suspend(void)
+{
+ u32 *pg_data = pmx->pg_data;
+ u32 *regs;
+ int i, j;
+
+ for (i = 0; i < pmx->nbanks; i++) {
+ regs = pmx->regs[i];
+ for (j = 0; j < pmx->reg_bank_size[i] / 4; j++)
+ *pg_data++ = readl(regs++);
+ }
+
+ return pinctrl_force_sleep(pmx->pctl);
+}
+
+static void __maybe_unused tegra_pinctrl_resume(void)
+{
+ u32 *pg_data = pmx->pg_data;
+ u32 *regs;
+ u32 val;
+ int i, j;
+
+ for (i = 0; i < pmx->nbanks; i++) {
+ regs = pmx->regs[i];
+ for (j = 0; j < pmx->reg_bank_size[i] / 4; j++)
+ writel(*pg_data++, regs++);
+ }
+
+ if (pmx->soc->has_park_padcfg) {
+ val = pmx_readl(pmx, 0, EMMC2_PAD_CFGPADCTRL_0);
+ val &= ~EMMC_DPD_PARKING;
+ pmx_writel(pmx, val, 0, EMMC2_PAD_CFGPADCTRL_0);
+
+ val = pmx_readl(pmx, 0, EMMC4_PAD_CFGPADCTRL_0);
+ val &= ~EMMC_DPD_PARKING;
+ pmx_writel(pmx, val, 0, EMMC4_PAD_CFGPADCTRL_0);
+ }
+}
+
+static struct syscore_ops pinctrl_syscore_ops = {
+ .suspend = tegra_pinctrl_suspend,
+ .resume = tegra_pinctrl_resume,
+};
+
static bool gpio_node_has_range(const char *compatible)
{
struct device_node *np;
@@ -648,11 +699,11 @@ static bool gpio_node_has_range(const char *compatible)
int tegra_pinctrl_probe(struct platform_device *pdev,
const struct tegra_pinctrl_soc_data *soc_data)
{
- struct tegra_pmx *pmx;
struct resource *res;
int i;
const char **group_pins;
int fn, gn, gfn;
+ int pg_data_size = 0;

pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL);
if (!pmx)
@@ -705,6 +756,7 @@ int tegra_pinctrl_probe(struct platform_device *pdev,
res = platform_get_resource(pdev, IORESOURCE_MEM, i);
if (!res)
break;
+ pg_data_size += resource_size(res);
}
pmx->nbanks = i;

@@ -712,12 +764,25 @@ int tegra_pinctrl_probe(struct platform_device *pdev,
GFP_KERNEL);
if (!pmx->regs)
return -ENOMEM;
+#ifdef CONFIG_PM_SLEEP
+ pmx->reg_bank_size = devm_kcalloc(&pdev->dev, pmx->nbanks,
+ sizeof(*pmx->reg_bank_size),
+ GFP_KERNEL);
+ if (!pmx->reg_bank_size)
+ return -ENOMEM;

+ pmx->pg_data = devm_kzalloc(&pdev->dev, pg_data_size, GFP_KERNEL);
+ if (!pmx->pg_data)
+ return -ENOMEM;
+#endif
for (i = 0; i < pmx->nbanks; i++) {
res = platform_get_resource(pdev, IORESOURCE_MEM, i);
pmx->regs[i] = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(pmx->regs[i]))
return PTR_ERR(pmx->regs[i]);
+#ifdef CONFIG_PM_SLEEP
+ pmx->reg_bank_size[i] = resource_size(res);
+#endif
}

pmx->pctl = devm_pinctrl_register(&pdev->dev, &tegra_pinctrl_desc, pmx);
@@ -732,6 +797,7 @@ int tegra_pinctrl_probe(struct platform_device *pdev,
pinctrl_add_gpio_range(pmx->pctl, &tegra_pinctrl_gpio_range);

platform_set_drvdata(pdev, pmx);
+ register_syscore_ops(&pinctrl_syscore_ops);

dev_dbg(&pdev->dev, "Probed Tegra pinctrl driver\n");

diff --git a/drivers/pinctrl/tegra/pinctrl-tegra.h b/drivers/pinctrl/tegra/pinctrl-tegra.h
index 44c71941b5f8..8c7cd94124ea 100644
--- a/drivers/pinctrl/tegra/pinctrl-tegra.h
+++ b/drivers/pinctrl/tegra/pinctrl-tegra.h
@@ -25,6 +25,8 @@ struct tegra_pmx {

int nbanks;
void __iomem **regs;
+ int *reg_bank_size;
+ u32 *pg_data;
};

enum tegra_pinconf_param {
@@ -199,6 +201,7 @@ struct tegra_pinctrl_soc_data {
bool hsm_in_mux;
bool schmitt_in_mux;
bool drvtype_in_mux;
+ bool has_park_padcfg;
};

int tegra_pinctrl_probe(struct platform_device *pdev,
diff --git a/drivers/pinctrl/tegra/pinctrl-tegra114.c b/drivers/pinctrl/tegra/pinctrl-tegra114.c
index d43c209e9c30..4ac44f34dccf 100644
--- a/drivers/pinctrl/tegra/pinctrl-tegra114.c
+++ b/drivers/pinctrl/tegra/pinctrl-tegra114.c
@@ -1849,6 +1849,7 @@ static const struct tegra_pinctrl_soc_data tegra114_pinctrl = {
.hsm_in_mux = false,
.schmitt_in_mux = false,
.drvtype_in_mux = false,
+ .has_park_padcfg = false,
};

static int tegra114_pinctrl_probe(struct platform_device *pdev)
diff --git a/drivers/pinctrl/tegra/pinctrl-tegra124.c b/drivers/pinctrl/tegra/pinctrl-tegra124.c
index 5b07a5834d15..1dac7648b41f 100644
--- a/drivers/pinctrl/tegra/pinctrl-tegra124.c
+++ b/drivers/pinctrl/tegra/pinctrl-tegra124.c
@@ -2061,6 +2061,7 @@ static const struct tegra_pinctrl_soc_data tegra124_pinctrl = {
.hsm_in_mux = false,
.schmitt_in_mux = false,
.drvtype_in_mux = false,
+ .has_park_padcfg = false,
};

static int tegra124_pinctrl_probe(struct platform_device *pdev)
diff --git a/drivers/pinctrl/tegra/pinctrl-tegra20.c b/drivers/pinctrl/tegra/pinctrl-tegra20.c
index 1fc82a9576e0..9d2b25200f32 100644
--- a/drivers/pinctrl/tegra/pinctrl-tegra20.c
+++ b/drivers/pinctrl/tegra/pinctrl-tegra20.c
@@ -2231,6 +2231,7 @@ static const struct tegra_pinctrl_soc_data tegra20_pinctrl = {
.hsm_in_mux = false,
.schmitt_in_mux = false,
.drvtype_in_mux = false,
+ .has_park_padcfg = false,
};

static const char *cdev1_parents[] = {
diff --git a/drivers/pinctrl/tegra/pinctrl-tegra210.c b/drivers/pinctrl/tegra/pinctrl-tegra210.c
index 3e77f5474dd8..dc06c36e698a 100644
--- a/drivers/pinctrl/tegra/pinctrl-tegra210.c
+++ b/drivers/pinctrl/tegra/pinctrl-tegra210.c
@@ -1563,6 +1563,7 @@ static const struct tegra_pinctrl_soc_data tegra210_pinctrl = {
.hsm_in_mux = true,
.schmitt_in_mux = true,
.drvtype_in_mux = true,
+ .has_park_padcfg = true,
};

static int tegra210_pinctrl_probe(struct platform_device *pdev)
diff --git a/drivers/pinctrl/tegra/pinctrl-tegra30.c b/drivers/pinctrl/tegra/pinctrl-tegra30.c
index 10e617003e9c..42182d714950 100644
--- a/drivers/pinctrl/tegra/pinctrl-tegra30.c
+++ b/drivers/pinctrl/tegra/pinctrl-tegra30.c
@@ -2484,6 +2484,7 @@ static const struct tegra_pinctrl_soc_data tegra30_pinctrl = {
.hsm_in_mux = false,
.schmitt_in_mux = false,
.drvtype_in_mux = false,
+ .has_park_padcfg = false,
};

static int tegra30_pinctrl_probe(struct platform_device *pdev)
--
2.7.4
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