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path: root/drivers/gpio/gpio-syscon.c
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Diffstat (limited to 'drivers/gpio/gpio-syscon.c')
-rw-r--r--drivers/gpio/gpio-syscon.c97
1 files changed, 86 insertions, 11 deletions
diff --git a/drivers/gpio/gpio-syscon.c b/drivers/gpio/gpio-syscon.c
index b50fe1297748..e82fde4b6898 100644
--- a/drivers/gpio/gpio-syscon.c
+++ b/drivers/gpio/gpio-syscon.c
@@ -37,6 +37,8 @@
* dat_bit_offset: Offset (in bits) to the first GPIO bit.
* dir_bit_offset: Optional offset (in bits) to the first bit to switch
* GPIO direction (Used with GPIO_SYSCON_FEAT_DIR flag).
+ * set: HW specific callback to assigns output value
+ * for signal "offset"
*/
struct syscon_gpio_data {
@@ -45,12 +47,16 @@ struct syscon_gpio_data {
unsigned int bit_count;
unsigned int dat_bit_offset;
unsigned int dir_bit_offset;
+ void (*set)(struct gpio_chip *chip,
+ unsigned offset, int value);
};
struct syscon_gpio_priv {
struct gpio_chip chip;
struct regmap *syscon;
const struct syscon_gpio_data *data;
+ u32 dreg_offset;
+ u32 dir_reg_offset;
};
static inline struct syscon_gpio_priv *to_syscon_gpio(struct gpio_chip *chip)
@@ -61,9 +67,11 @@ static inline struct syscon_gpio_priv *to_syscon_gpio(struct gpio_chip *chip)
static int syscon_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct syscon_gpio_priv *priv = to_syscon_gpio(chip);
- unsigned int val, offs = priv->data->dat_bit_offset + offset;
+ unsigned int val, offs;
int ret;
+ offs = priv->dreg_offset + priv->data->dat_bit_offset + offset;
+
ret = regmap_read(priv->syscon,
(offs / SYSCON_REG_BITS) * SYSCON_REG_SIZE, &val);
if (ret)
@@ -75,7 +83,9 @@ static int syscon_gpio_get(struct gpio_chip *chip, unsigned offset)
static void syscon_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
{
struct syscon_gpio_priv *priv = to_syscon_gpio(chip);
- unsigned int offs = priv->data->dat_bit_offset + offset;
+ unsigned int offs;
+
+ offs = priv->dreg_offset + priv->data->dat_bit_offset + offset;
regmap_update_bits(priv->syscon,
(offs / SYSCON_REG_BITS) * SYSCON_REG_SIZE,
@@ -88,7 +98,10 @@ static int syscon_gpio_dir_in(struct gpio_chip *chip, unsigned offset)
struct syscon_gpio_priv *priv = to_syscon_gpio(chip);
if (priv->data->flags & GPIO_SYSCON_FEAT_DIR) {
- unsigned int offs = priv->data->dir_bit_offset + offset;
+ unsigned int offs;
+
+ offs = priv->dir_reg_offset +
+ priv->data->dir_bit_offset + offset;
regmap_update_bits(priv->syscon,
(offs / SYSCON_REG_BITS) * SYSCON_REG_SIZE,
@@ -103,7 +116,10 @@ static int syscon_gpio_dir_out(struct gpio_chip *chip, unsigned offset, int val)
struct syscon_gpio_priv *priv = to_syscon_gpio(chip);
if (priv->data->flags & GPIO_SYSCON_FEAT_DIR) {
- unsigned int offs = priv->data->dir_bit_offset + offset;
+ unsigned int offs;
+
+ offs = priv->dir_reg_offset +
+ priv->data->dir_bit_offset + offset;
regmap_update_bits(priv->syscon,
(offs / SYSCON_REG_BITS) * SYSCON_REG_SIZE,
@@ -111,7 +127,7 @@ static int syscon_gpio_dir_out(struct gpio_chip *chip, unsigned offset, int val)
BIT(offs % SYSCON_REG_BITS));
}
- syscon_gpio_set(chip, offset, val);
+ priv->data->set(chip, offset, val);
return 0;
}
@@ -124,11 +140,46 @@ static const struct syscon_gpio_data clps711x_mctrl_gpio = {
.dat_bit_offset = 0x40 * 8 + 8,
};
+#define KEYSTONE_LOCK_BIT BIT(0)
+
+static void keystone_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
+{
+ struct syscon_gpio_priv *priv = to_syscon_gpio(chip);
+ unsigned int offs;
+ int ret;
+
+ offs = priv->dreg_offset + priv->data->dat_bit_offset + offset;
+
+ if (!val)
+ return;
+
+ ret = regmap_update_bits(
+ priv->syscon,
+ (offs / SYSCON_REG_BITS) * SYSCON_REG_SIZE,
+ BIT(offs % SYSCON_REG_BITS) | KEYSTONE_LOCK_BIT,
+ BIT(offs % SYSCON_REG_BITS) | KEYSTONE_LOCK_BIT);
+ if (ret < 0)
+ dev_err(chip->dev, "gpio write failed ret(%d)\n", ret);
+}
+
+static const struct syscon_gpio_data keystone_dsp_gpio = {
+ /* ARM Keystone 2 */
+ .compatible = NULL,
+ .flags = GPIO_SYSCON_FEAT_OUT,
+ .bit_count = 28,
+ .dat_bit_offset = 4,
+ .set = keystone_gpio_set,
+};
+
static const struct of_device_id syscon_gpio_ids[] = {
{
.compatible = "cirrus,clps711x-mctrl-gpio",
.data = &clps711x_mctrl_gpio,
},
+ {
+ .compatible = "ti,keystone-dsp-gpio",
+ .data = &keystone_dsp_gpio,
+ },
{ }
};
MODULE_DEVICE_TABLE(of, syscon_gpio_ids);
@@ -138,6 +189,8 @@ static int syscon_gpio_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
const struct of_device_id *of_id = of_match_device(syscon_gpio_ids, dev);
struct syscon_gpio_priv *priv;
+ struct device_node *np = dev->of_node;
+ int ret;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
@@ -145,10 +198,31 @@ static int syscon_gpio_probe(struct platform_device *pdev)
priv->data = of_id->data;
- priv->syscon =
- syscon_regmap_lookup_by_compatible(priv->data->compatible);
- if (IS_ERR(priv->syscon))
- return PTR_ERR(priv->syscon);
+ if (priv->data->compatible) {
+ priv->syscon = syscon_regmap_lookup_by_compatible(
+ priv->data->compatible);
+ if (IS_ERR(priv->syscon))
+ return PTR_ERR(priv->syscon);
+ } else {
+ priv->syscon =
+ syscon_regmap_lookup_by_phandle(np, "gpio,syscon-dev");
+ if (IS_ERR(priv->syscon))
+ return PTR_ERR(priv->syscon);
+
+ ret = of_property_read_u32_index(np, "gpio,syscon-dev", 1,
+ &priv->dreg_offset);
+ if (ret)
+ dev_err(dev, "can't read the data register offset!\n");
+
+ priv->dreg_offset <<= 3;
+
+ ret = of_property_read_u32_index(np, "gpio,syscon-dev", 2,
+ &priv->dir_reg_offset);
+ if (ret)
+ dev_err(dev, "can't read the dir register offset!\n");
+
+ priv->dir_reg_offset <<= 3;
+ }
priv->chip.dev = dev;
priv->chip.owner = THIS_MODULE;
@@ -159,7 +233,7 @@ static int syscon_gpio_probe(struct platform_device *pdev)
if (priv->data->flags & GPIO_SYSCON_FEAT_IN)
priv->chip.direction_input = syscon_gpio_dir_in;
if (priv->data->flags & GPIO_SYSCON_FEAT_OUT) {
- priv->chip.set = syscon_gpio_set;
+ priv->chip.set = priv->data->set ? : syscon_gpio_set;
priv->chip.direction_output = syscon_gpio_dir_out;
}
@@ -172,7 +246,8 @@ static int syscon_gpio_remove(struct platform_device *pdev)
{
struct syscon_gpio_priv *priv = platform_get_drvdata(pdev);
- return gpiochip_remove(&priv->chip);
+ gpiochip_remove(&priv->chip);
+ return 0;
}
static struct platform_driver syscon_gpio_driver = {
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-28 04:15:53 +0300