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path: root/drivers/pinctrl/bcm/pinctrl-iproc-gpio.c
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Diffstat (limited to 'drivers/pinctrl/bcm/pinctrl-iproc-gpio.c')
-rw-r--r--drivers/pinctrl/bcm/pinctrl-iproc-gpio.c118
1 files changed, 111 insertions, 7 deletions
diff --git a/drivers/pinctrl/bcm/pinctrl-iproc-gpio.c b/drivers/pinctrl/bcm/pinctrl-iproc-gpio.c
index 3670f5ea7a12..7f7700716398 100644
--- a/drivers/pinctrl/bcm/pinctrl-iproc-gpio.c
+++ b/drivers/pinctrl/bcm/pinctrl-iproc-gpio.c
@@ -66,6 +66,14 @@
#define GPIO_DRV_STRENGTH_BITS 3
#define GPIO_DRV_STRENGTH_BIT_MASK ((1 << GPIO_DRV_STRENGTH_BITS) - 1)
+enum iproc_pinconf_param {
+ IPROC_PINCONF_DRIVE_STRENGTH = 0,
+ IPROC_PINCONF_BIAS_DISABLE,
+ IPROC_PINCONF_BIAS_PULL_UP,
+ IPROC_PINCONF_BIAS_PULL_DOWN,
+ IPROC_PINCON_MAX,
+};
+
/*
* Iproc GPIO core
*
@@ -78,6 +86,10 @@
* @num_banks: number of GPIO banks, each bank supports up to 32 GPIOs
* @pinmux_is_supported: flag to indicate this GPIO controller contains pins
* that can be individually muxed to GPIO
+ * @pinconf_disable: contains a list of PINCONF parameters that need to be
+ * disabled
+ * @nr_pinconf_disable: total number of PINCONF parameters that need to be
+ * disabled
* @pctl: pointer to pinctrl_dev
* @pctldesc: pinctrl descriptor
*/
@@ -94,6 +106,9 @@ struct iproc_gpio {
bool pinmux_is_supported;
+ enum pin_config_param *pinconf_disable;
+ unsigned int nr_pinconf_disable;
+
struct pinctrl_dev *pctl;
struct pinctrl_desc pctldesc;
};
@@ -360,6 +375,65 @@ static int iproc_gpio_get(struct gpio_chip *gc, unsigned gpio)
return !!(readl(chip->base + offset) & BIT(shift));
}
+/*
+ * Mapping of the iProc PINCONF parameters to the generic pin configuration
+ * parameters
+ */
+static const enum pin_config_param iproc_pinconf_disable_map[] = {
+ [IPROC_PINCONF_DRIVE_STRENGTH] = PIN_CONFIG_DRIVE_STRENGTH,
+ [IPROC_PINCONF_BIAS_DISABLE] = PIN_CONFIG_BIAS_DISABLE,
+ [IPROC_PINCONF_BIAS_PULL_UP] = PIN_CONFIG_BIAS_PULL_UP,
+ [IPROC_PINCONF_BIAS_PULL_DOWN] = PIN_CONFIG_BIAS_PULL_DOWN,
+};
+
+static bool iproc_pinconf_param_is_disabled(struct iproc_gpio *chip,
+ enum pin_config_param param)
+{
+ unsigned int i;
+
+ if (!chip->nr_pinconf_disable)
+ return false;
+
+ for (i = 0; i < chip->nr_pinconf_disable; i++)
+ if (chip->pinconf_disable[i] == param)
+ return true;
+
+ return false;
+}
+
+static int iproc_pinconf_disable_map_create(struct iproc_gpio *chip,
+ unsigned long disable_mask)
+{
+ unsigned int map_size = ARRAY_SIZE(iproc_pinconf_disable_map);
+ unsigned int bit, nbits = 0;
+
+ /* figure out total number of PINCONF parameters to disable */
+ for_each_set_bit(bit, &disable_mask, map_size)
+ nbits++;
+
+ if (!nbits)
+ return 0;
+
+ /*
+ * Allocate an array to store PINCONF parameters that need to be
+ * disabled
+ */
+ chip->pinconf_disable = devm_kcalloc(chip->dev, nbits,
+ sizeof(*chip->pinconf_disable),
+ GFP_KERNEL);
+ if (!chip->pinconf_disable)
+ return -ENOMEM;
+
+ chip->nr_pinconf_disable = nbits;
+
+ /* now store these parameters */
+ nbits = 0;
+ for_each_set_bit(bit, &disable_mask, map_size)
+ chip->pinconf_disable[nbits++] = iproc_pinconf_disable_map[bit];
+
+ return 0;
+}
+
static int iproc_get_groups_count(struct pinctrl_dev *pctldev)
{
return 1;
@@ -500,6 +574,9 @@ static int iproc_pin_config_get(struct pinctrl_dev *pctldev, unsigned pin,
bool disable, pull_up;
int ret;
+ if (iproc_pinconf_param_is_disabled(chip, param))
+ return -ENOTSUPP;
+
switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
iproc_gpio_get_pull(chip, gpio, &disable, &pull_up);
@@ -548,6 +625,10 @@ static int iproc_pin_config_set(struct pinctrl_dev *pctldev, unsigned pin,
for (i = 0; i < num_configs; i++) {
param = pinconf_to_config_param(configs[i]);
+
+ if (iproc_pinconf_param_is_disabled(chip, param))
+ return -ENOTSUPP;
+
arg = pinconf_to_config_argument(configs[i]);
switch (param) {
@@ -633,11 +714,13 @@ static int iproc_gpio_register_pinconf(struct iproc_gpio *chip)
}
static const struct of_device_id iproc_gpio_of_match[] = {
+ { .compatible = "brcm,iproc-gpio" },
{ .compatible = "brcm,cygnus-ccm-gpio" },
{ .compatible = "brcm,cygnus-asiu-gpio" },
{ .compatible = "brcm,cygnus-crmu-gpio" },
- { .compatible = "brcm,iproc-gpio" },
- { }
+ { .compatible = "brcm,iproc-nsp-gpio" },
+ { .compatible = "brcm,iproc-stingray-gpio" },
+ { /* sentinel */ }
};
static int iproc_gpio_probe(struct platform_device *pdev)
@@ -646,8 +729,17 @@ static int iproc_gpio_probe(struct platform_device *pdev)
struct resource *res;
struct iproc_gpio *chip;
struct gpio_chip *gc;
- u32 ngpios;
+ u32 ngpios, pinconf_disable_mask = 0;
int irq, ret;
+ bool no_pinconf = false;
+
+ /* NSP does not support drive strength config */
+ if (of_device_is_compatible(dev->of_node, "brcm,iproc-nsp-gpio"))
+ pinconf_disable_mask = BIT(IPROC_PINCONF_DRIVE_STRENGTH);
+ /* Stingray does not support pinconf in this controller */
+ else if (of_device_is_compatible(dev->of_node,
+ "brcm,iproc-stingray-gpio"))
+ no_pinconf = true;
chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
if (!chip)
@@ -702,10 +794,22 @@ static int iproc_gpio_probe(struct platform_device *pdev)
return ret;
}
- ret = iproc_gpio_register_pinconf(chip);
- if (ret) {
- dev_err(dev, "unable to register pinconf\n");
- goto err_rm_gpiochip;
+ if (!no_pinconf) {
+ ret = iproc_gpio_register_pinconf(chip);
+ if (ret) {
+ dev_err(dev, "unable to register pinconf\n");
+ goto err_rm_gpiochip;
+ }
+
+ if (pinconf_disable_mask) {
+ ret = iproc_pinconf_disable_map_create(chip,
+ pinconf_disable_mask);
+ if (ret) {
+ dev_err(dev,
+ "unable to create pinconf disable map\n");
+ goto err_rm_gpiochip;
+ }
+ }
}
/* optional GPIO interrupt support */