Commit 9697509e authored by Masahiro Yamada's avatar Masahiro Yamada Committed by Linus Walleij

pinctrl: uniphier: add suspend / resume support

Save registers lost in the sleep when suspending, and restore them
when resuming.
Signed-off-by: default avatarMasahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 4e767983
......@@ -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");
......
......@@ -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);
......@@ -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);
......@@ -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);
......@@ -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);
......@@ -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);
......@@ -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);
......@@ -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);
......@@ -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);
......@@ -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__ */
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