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Subject[PATCH 5/6] pinctrl: uniphier: add suspend / resume support
Date
Save registers lost in the sleep when suspending, and restore them
when resuming.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
---

drivers/pinctrl/uniphier/pinctrl-uniphier-core.c | 178 +++++++++++++++++++++++
drivers/pinctrl/uniphier/pinctrl-uniphier-ld11.c | 1 +
drivers/pinctrl/uniphier/pinctrl-uniphier-ld20.c | 1 +
drivers/pinctrl/uniphier/pinctrl-uniphier-ld4.c | 1 +
drivers/pinctrl/uniphier/pinctrl-uniphier-ld6b.c | 1 +
drivers/pinctrl/uniphier/pinctrl-uniphier-pro4.c | 1 +
drivers/pinctrl/uniphier/pinctrl-uniphier-pro5.c | 1 +
drivers/pinctrl/uniphier/pinctrl-uniphier-pxs2.c | 1 +
drivers/pinctrl/uniphier/pinctrl-uniphier-sld8.c | 1 +
drivers/pinctrl/uniphier/pinctrl-uniphier.h | 2 +
10 files changed, 188 insertions(+)

diff --git a/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c b/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c
index b976e9109b1d..5d8c9efd8135 100644
--- a/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c
+++ b/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c
@@ -13,6 +13,7 @@
* GNU General Public License for more details.
*/

+#include <linux/list.h>
#include <linux/mfd/syscon.h>
#include <linux/of.h>
#include <linux/pinctrl/pinconf.h>
@@ -34,11 +35,19 @@
#define UNIPHIER_PINCTRL_PUPDCTRL_BASE 0x1a00
#define UNIPHIER_PINCTRL_IECTRL_BASE 0x1d00

+struct uniphier_pinctrl_reg_region {
+ struct list_head node;
+ unsigned int base;
+ unsigned int nregs;
+ u32 vals[0];
+};
+
struct uniphier_pinctrl_priv {
struct pinctrl_desc pctldesc;
struct pinctrl_dev *pctldev;
struct regmap *regmap;
struct uniphier_pinctrl_socdata *socdata;
+ struct list_head reg_regions;
};

static int uniphier_pctl_get_groups_count(struct pinctrl_dev *pctldev)
@@ -688,12 +697,177 @@ static const struct pinmux_ops uniphier_pmxops = {
.strict = true,
};

+#ifdef CONFIG_PM_SLEEP
+static int uniphier_pinctrl_suspend(struct device *dev)
+{
+ struct uniphier_pinctrl_priv *priv = dev_get_drvdata(dev);
+ struct uniphier_pinctrl_reg_region *r;
+ int ret;
+
+ list_for_each_entry(r, &priv->reg_regions, node) {
+ ret = regmap_bulk_read(priv->regmap, r->base, r->vals,
+ r->nregs);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int uniphier_pinctrl_resume(struct device *dev)
+{
+ struct uniphier_pinctrl_priv *priv = dev_get_drvdata(dev);
+ struct uniphier_pinctrl_reg_region *r;
+ int ret;
+
+ list_for_each_entry(r, &priv->reg_regions, node) {
+ ret = regmap_bulk_write(priv->regmap, r->base, r->vals,
+ r->nregs);
+ if (ret)
+ return ret;
+ }
+
+ if (priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_DBGMUX_SEPARATE) {
+ ret = regmap_write(priv->regmap,
+ UNIPHIER_PINCTRL_LOAD_PINMUX, 1);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int uniphier_pinctrl_add_reg_region(struct device *dev,
+ struct uniphier_pinctrl_priv *priv,
+ unsigned int base,
+ unsigned int count,
+ unsigned int width)
+{
+ struct uniphier_pinctrl_reg_region *region;
+ unsigned int nregs;
+
+ if (!count)
+ return 0;
+
+ nregs = DIV_ROUND_UP(count * width, 32);
+
+ region = devm_kzalloc(dev,
+ sizeof(*region) + sizeof(region->vals[0]) * nregs,
+ GFP_KERNEL);
+ if (!region)
+ return -ENOMEM;
+
+ region->base = base;
+ region->nregs = nregs;
+
+ list_add_tail(&region->node, &priv->reg_regions);
+
+ return 0;
+}
+#endif
+
+static int uniphier_pinctrl_pm_init(struct device *dev,
+ struct uniphier_pinctrl_priv *priv)
+{
+#ifdef CONFIG_PM_SLEEP
+ const struct uniphier_pinctrl_socdata *socdata = priv->socdata;
+ unsigned int num_drvctrl = 0;
+ unsigned int num_drv2ctrl = 0;
+ unsigned int num_drv3ctrl = 0;
+ unsigned int num_pupdctrl = 0;
+ unsigned int num_iectrl = 0;
+ unsigned int iectrl, drvctrl, pupdctrl;
+ enum uniphier_pin_drv_type drv_type;
+ enum uniphier_pin_pull_dir pull_dir;
+ int i, ret;
+
+ for (i = 0; i < socdata->npins; i++) {
+ void *drv_data = socdata->pins[i].drv_data;
+
+ drvctrl = uniphier_pin_get_drvctrl(drv_data);
+ drv_type = uniphier_pin_get_drv_type(drv_data);
+ pupdctrl = uniphier_pin_get_pupdctrl(drv_data);
+ pull_dir = uniphier_pin_get_pull_dir(drv_data);
+ iectrl = uniphier_pin_get_iectrl(drv_data);
+
+ switch (drv_type) {
+ case UNIPHIER_PIN_DRV_1BIT:
+ num_drvctrl = max(num_drvctrl, drvctrl + 1);
+ break;
+ case UNIPHIER_PIN_DRV_2BIT:
+ num_drv2ctrl = max(num_drv2ctrl, drvctrl + 1);
+ break;
+ case UNIPHIER_PIN_DRV_3BIT:
+ num_drv3ctrl = max(num_drv3ctrl, drvctrl + 1);
+ break;
+ default:
+ break;
+ }
+
+ if (pull_dir == UNIPHIER_PIN_PULL_UP ||
+ pull_dir == UNIPHIER_PIN_PULL_DOWN)
+ num_pupdctrl = max(num_pupdctrl, pupdctrl + 1);
+
+ if (iectrl != UNIPHIER_PIN_IECTRL_NONE) {
+ if (socdata->caps & UNIPHIER_PINCTRL_CAPS_PERPIN_IECTRL)
+ iectrl = i;
+ num_iectrl = max(num_iectrl, iectrl + 1);
+ }
+ }
+
+ INIT_LIST_HEAD(&priv->reg_regions);
+
+ ret = uniphier_pinctrl_add_reg_region(dev, priv,
+ UNIPHIER_PINCTRL_PINMUX_BASE,
+ socdata->npins, 8);
+ if (ret)
+ return ret;
+
+ ret = uniphier_pinctrl_add_reg_region(dev, priv,
+ UNIPHIER_PINCTRL_DRVCTRL_BASE,
+ num_drvctrl, 1);
+ if (ret)
+ return ret;
+
+ ret = uniphier_pinctrl_add_reg_region(dev, priv,
+ UNIPHIER_PINCTRL_DRV2CTRL_BASE,
+ num_drv2ctrl, 2);
+ if (ret)
+ return ret;
+
+ ret = uniphier_pinctrl_add_reg_region(dev, priv,
+ UNIPHIER_PINCTRL_DRV3CTRL_BASE,
+ num_drv3ctrl, 3);
+ if (ret)
+ return ret;
+
+ ret = uniphier_pinctrl_add_reg_region(dev, priv,
+ UNIPHIER_PINCTRL_PUPDCTRL_BASE,
+ num_pupdctrl, 1);
+ if (ret)
+ return ret;
+
+ ret = uniphier_pinctrl_add_reg_region(dev, priv,
+ UNIPHIER_PINCTRL_IECTRL_BASE,
+ num_iectrl, 1);
+ if (ret)
+ return ret;
+#endif
+ return 0;
+}
+
+const struct dev_pm_ops uniphier_pinctrl_pm_ops = {
+ SET_LATE_SYSTEM_SLEEP_PM_OPS(uniphier_pinctrl_suspend,
+ uniphier_pinctrl_resume)
+};
+
int uniphier_pinctrl_probe(struct platform_device *pdev,
struct uniphier_pinctrl_socdata *socdata)
{
struct device *dev = &pdev->dev;
struct uniphier_pinctrl_priv *priv;
struct device_node *parent;
+ int ret;

if (!socdata ||
!socdata->pins || !socdata->npins ||
@@ -725,6 +899,10 @@ int uniphier_pinctrl_probe(struct platform_device *pdev,
priv->pctldesc.confops = &uniphier_confops;
priv->pctldesc.owner = dev->driver->owner;

+ ret = uniphier_pinctrl_pm_init(dev, priv);
+ if (ret)
+ return ret;
+
priv->pctldev = devm_pinctrl_register(dev, &priv->pctldesc, priv);
if (IS_ERR(priv->pctldev)) {
dev_err(dev, "failed to register UniPhier pinctrl driver\n");
diff --git a/drivers/pinctrl/uniphier/pinctrl-uniphier-ld11.c b/drivers/pinctrl/uniphier/pinctrl-uniphier-ld11.c
index be08de07146e..745706920642 100644
--- a/drivers/pinctrl/uniphier/pinctrl-uniphier-ld11.c
+++ b/drivers/pinctrl/uniphier/pinctrl-uniphier-ld11.c
@@ -643,6 +643,7 @@ static struct platform_driver uniphier_ld11_pinctrl_driver = {
.driver = {
.name = "uniphier-ld11-pinctrl",
.of_match_table = uniphier_ld11_pinctrl_match,
+ .pm = &uniphier_pinctrl_pm_ops,
},
};
builtin_platform_driver(uniphier_ld11_pinctrl_driver);
diff --git a/drivers/pinctrl/uniphier/pinctrl-uniphier-ld20.c b/drivers/pinctrl/uniphier/pinctrl-uniphier-ld20.c
index e5bc7c36c1e4..82f754cd85d9 100644
--- a/drivers/pinctrl/uniphier/pinctrl-uniphier-ld20.c
+++ b/drivers/pinctrl/uniphier/pinctrl-uniphier-ld20.c
@@ -733,6 +733,7 @@ static struct platform_driver uniphier_ld20_pinctrl_driver = {
.driver = {
.name = "uniphier-ld20-pinctrl",
.of_match_table = uniphier_ld20_pinctrl_match,
+ .pm = &uniphier_pinctrl_pm_ops,
},
};
builtin_platform_driver(uniphier_ld20_pinctrl_driver);
diff --git a/drivers/pinctrl/uniphier/pinctrl-uniphier-ld4.c b/drivers/pinctrl/uniphier/pinctrl-uniphier-ld4.c
index 7db3fd0f72e5..840382847212 100644
--- a/drivers/pinctrl/uniphier/pinctrl-uniphier-ld4.c
+++ b/drivers/pinctrl/uniphier/pinctrl-uniphier-ld4.c
@@ -740,6 +740,7 @@ static struct platform_driver uniphier_ld4_pinctrl_driver = {
.driver = {
.name = "uniphier-ld4-pinctrl",
.of_match_table = uniphier_ld4_pinctrl_match,
+ .pm = &uniphier_pinctrl_pm_ops,
},
};
builtin_platform_driver(uniphier_ld4_pinctrl_driver);
diff --git a/drivers/pinctrl/uniphier/pinctrl-uniphier-ld6b.c b/drivers/pinctrl/uniphier/pinctrl-uniphier-ld6b.c
index 2d8dc0f0b907..493a90c6d733 100644
--- a/drivers/pinctrl/uniphier/pinctrl-uniphier-ld6b.c
+++ b/drivers/pinctrl/uniphier/pinctrl-uniphier-ld6b.c
@@ -950,6 +950,7 @@ static struct platform_driver uniphier_ld6b_pinctrl_driver = {
.driver = {
.name = "uniphier-ld6b-pinctrl",
.of_match_table = uniphier_ld6b_pinctrl_match,
+ .pm = &uniphier_pinctrl_pm_ops,
},
};
builtin_platform_driver(uniphier_ld6b_pinctrl_driver);
diff --git a/drivers/pinctrl/uniphier/pinctrl-uniphier-pro4.c b/drivers/pinctrl/uniphier/pinctrl-uniphier-pro4.c
index 1c95a4689eda..24d358290a0c 100644
--- a/drivers/pinctrl/uniphier/pinctrl-uniphier-pro4.c
+++ b/drivers/pinctrl/uniphier/pinctrl-uniphier-pro4.c
@@ -1245,6 +1245,7 @@ static struct platform_driver uniphier_pro4_pinctrl_driver = {
.driver = {
.name = "uniphier-pro4-pinctrl",
.of_match_table = uniphier_pro4_pinctrl_match,
+ .pm = &uniphier_pinctrl_pm_ops,
},
};
builtin_platform_driver(uniphier_pro4_pinctrl_driver);
diff --git a/drivers/pinctrl/uniphier/pinctrl-uniphier-pro5.c b/drivers/pinctrl/uniphier/pinctrl-uniphier-pro5.c
index d0d730b2e71e..9381a4ff4389 100644
--- a/drivers/pinctrl/uniphier/pinctrl-uniphier-pro5.c
+++ b/drivers/pinctrl/uniphier/pinctrl-uniphier-pro5.c
@@ -1003,6 +1003,7 @@ static struct platform_driver uniphier_pro5_pinctrl_driver = {
.driver = {
.name = "uniphier-pro5-pinctrl",
.of_match_table = uniphier_pro5_pinctrl_match,
+ .pm = &uniphier_pinctrl_pm_ops,
},
};
builtin_platform_driver(uniphier_pro5_pinctrl_driver);
diff --git a/drivers/pinctrl/uniphier/pinctrl-uniphier-pxs2.c b/drivers/pinctrl/uniphier/pinctrl-uniphier-pxs2.c
index e323c3e19a41..c0ef40ae99a7 100644
--- a/drivers/pinctrl/uniphier/pinctrl-uniphier-pxs2.c
+++ b/drivers/pinctrl/uniphier/pinctrl-uniphier-pxs2.c
@@ -937,6 +937,7 @@ static struct platform_driver uniphier_pxs2_pinctrl_driver = {
.driver = {
.name = "uniphier-pxs2-pinctrl",
.of_match_table = uniphier_pxs2_pinctrl_match,
+ .pm = &uniphier_pinctrl_pm_ops,
},
};
builtin_platform_driver(uniphier_pxs2_pinctrl_driver);
diff --git a/drivers/pinctrl/uniphier/pinctrl-uniphier-sld8.c b/drivers/pinctrl/uniphier/pinctrl-uniphier-sld8.c
index f0221e93aa25..1af430d701be 100644
--- a/drivers/pinctrl/uniphier/pinctrl-uniphier-sld8.c
+++ b/drivers/pinctrl/uniphier/pinctrl-uniphier-sld8.c
@@ -669,6 +669,7 @@ static struct platform_driver uniphier_sld8_pinctrl_driver = {
.driver = {
.name = "uniphier-sld8-pinctrl",
.of_match_table = uniphier_sld8_pinctrl_match,
+ .pm = &uniphier_pinctrl_pm_ops,
},
};
builtin_platform_driver(uniphier_sld8_pinctrl_driver);
diff --git a/drivers/pinctrl/uniphier/pinctrl-uniphier.h b/drivers/pinctrl/uniphier/pinctrl-uniphier.h
index 24e48e3ed048..c075ecb8e5db 100644
--- a/drivers/pinctrl/uniphier/pinctrl-uniphier.h
+++ b/drivers/pinctrl/uniphier/pinctrl-uniphier.h
@@ -192,4 +192,6 @@ struct uniphier_pinctrl_socdata {
int uniphier_pinctrl_probe(struct platform_device *pdev,
struct uniphier_pinctrl_socdata *socdata);

+extern const struct dev_pm_ops uniphier_pinctrl_pm_ops;
+
#endif /* __PINCTRL_UNIPHIER_H__ */
--
2.7.4
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