diff options
Diffstat (limited to 'drivers/pinctrl/pinctrl-lpc18xx.c')
| -rw-r--r-- | drivers/pinctrl/pinctrl-lpc18xx.c | 143 |
1 files changed, 137 insertions, 6 deletions
diff --git a/drivers/pinctrl/pinctrl-lpc18xx.c b/drivers/pinctrl/pinctrl-lpc18xx.c index ed1cfa7e43dd..b1767f7e45d1 100644 --- a/drivers/pinctrl/pinctrl-lpc18xx.c +++ b/drivers/pinctrl/pinctrl-lpc18xx.c @@ -49,6 +49,18 @@ #define LPC18XX_SCU_FUNC_PER_PIN 8 +/* LPC18XX SCU pin interrupt select registers */ +#define LPC18XX_SCU_PINTSEL0 0xe00 +#define LPC18XX_SCU_PINTSEL1 0xe04 +#define LPC18XX_SCU_PINTSEL_VAL_MASK 0xff +#define LPC18XX_SCU_PINTSEL_PORT_SHIFT 5 +#define LPC18XX_SCU_IRQ_PER_PINTSEL 4 +#define LPC18XX_GPIO_PINS_PER_PORT 32 +#define LPC18XX_GPIO_PIN_INT_MAX 8 + +#define LPC18XX_SCU_PINTSEL_VAL(val, n) \ + ((val) << (((n) % LPC18XX_SCU_IRQ_PER_PINTSEL) * 8)) + /* LPC18xx pin types */ enum { TYPE_ND, /* Normal-drive */ @@ -618,6 +630,25 @@ static const struct pinctrl_pin_desc lpc18xx_pins[] = { LPC18XX_PIN(i2c0_sda, PIN_I2C0_SDA), }; +/** + * enum lpc18xx_pin_config_param - possible pin configuration parameters + * @PIN_CONFIG_GPIO_PIN_INT: route gpio to the gpio pin interrupt + * controller. + */ +enum lpc18xx_pin_config_param { + PIN_CONFIG_GPIO_PIN_INT = PIN_CONFIG_END + 1, +}; + +static const struct pinconf_generic_params lpc18xx_params[] = { + {"nxp,gpio-pin-interrupt", PIN_CONFIG_GPIO_PIN_INT, 0}, +}; + +#ifdef CONFIG_DEBUG_FS +static const struct pin_config_item lpc18xx_conf_items[ARRAY_SIZE(lpc18xx_params)] = { + PCONFDUMP(PIN_CONFIG_GPIO_PIN_INT, "gpio pin int", NULL, true), +}; +#endif + static int lpc18xx_pconf_get_usb1(enum pin_config_param param, int *arg, u32 reg) { switch (param) { @@ -693,7 +724,71 @@ static int lpc18xx_pconf_get_i2c0(enum pin_config_param param, int *arg, u32 reg return 0; } -static int lpc18xx_pconf_get_pin(enum pin_config_param param, int *arg, u32 reg, +static int lpc18xx_pin_to_gpio(struct pinctrl_dev *pctldev, unsigned pin) +{ + struct pinctrl_gpio_range *range; + + range = pinctrl_find_gpio_range_from_pin_nolock(pctldev, pin); + if (!range) + return -EINVAL; + + return pin - range->pin_base + range->base; +} + +static int lpc18xx_get_pintsel(void __iomem *addr, u32 val, int *arg) +{ + u32 reg_val; + int i; + + reg_val = readl(addr); + for (i = 0; i < LPC18XX_SCU_IRQ_PER_PINTSEL; i++) { + if ((reg_val & LPC18XX_SCU_PINTSEL_VAL_MASK) == val) + return 0; + + reg_val >>= BITS_PER_BYTE; + *arg += 1; + } + + return -EINVAL; +} + +static u32 lpc18xx_gpio_to_pintsel_val(int gpio) +{ + unsigned int gpio_port, gpio_pin; + + gpio_port = gpio / LPC18XX_GPIO_PINS_PER_PORT; + gpio_pin = gpio % LPC18XX_GPIO_PINS_PER_PORT; + + return gpio_pin | (gpio_port << LPC18XX_SCU_PINTSEL_PORT_SHIFT); +} + +static int lpc18xx_pconf_get_gpio_pin_int(struct pinctrl_dev *pctldev, + int *arg, unsigned pin) +{ + struct lpc18xx_scu_data *scu = pinctrl_dev_get_drvdata(pctldev); + int gpio, ret; + u32 val; + + gpio = lpc18xx_pin_to_gpio(pctldev, pin); + if (gpio < 0) + return -ENOTSUPP; + + val = lpc18xx_gpio_to_pintsel_val(gpio); + + /* + * Check if this pin has been enabled as a interrupt in any of the two + * PINTSEL registers. *arg indicates which interrupt number (0-7). + */ + *arg = 0; + ret = lpc18xx_get_pintsel(scu->base + LPC18XX_SCU_PINTSEL0, val, arg); + if (ret == 0) + return ret; + + return lpc18xx_get_pintsel(scu->base + LPC18XX_SCU_PINTSEL1, val, arg); +} + +static int lpc18xx_pconf_get_pin(struct pinctrl_dev *pctldev, unsigned param, + int *arg, u32 reg, unsigned pin, struct lpc18xx_pin_caps *pin_cap) { switch (param) { @@ -755,6 +850,9 @@ static int lpc18xx_pconf_get_pin(enum pin_config_param param, int *arg, u32 reg, } break; + case PIN_CONFIG_GPIO_PIN_INT: + return lpc18xx_pconf_get_gpio_pin_int(pctldev, arg, pin); + default: return -ENOTSUPP; } @@ -794,7 +892,7 @@ static int lpc18xx_pconf_get(struct pinctrl_dev *pctldev, unsigned pin, else if (pin_cap->type == TYPE_USB1) ret = lpc18xx_pconf_get_usb1(param, &arg, reg); else - ret = lpc18xx_pconf_get_pin(param, &arg, reg, pin_cap); + ret = lpc18xx_pconf_get_pin(pctldev, param, &arg, reg, pin, pin_cap); if (ret < 0) return ret; @@ -883,9 +981,34 @@ static int lpc18xx_pconf_set_i2c0(struct pinctrl_dev *pctldev, return 0; } -static int lpc18xx_pconf_set_pin(struct pinctrl_dev *pctldev, - enum pin_config_param param, - u16 param_val, u32 *reg, +static int lpc18xx_pconf_set_gpio_pin_int(struct pinctrl_dev *pctldev, + u16 param_val, unsigned pin) +{ + struct lpc18xx_scu_data *scu = pinctrl_dev_get_drvdata(pctldev); + u32 val, reg_val, reg_offset = LPC18XX_SCU_PINTSEL0; + int gpio; + + if (param_val >= LPC18XX_GPIO_PIN_INT_MAX) + return -EINVAL; + + gpio = lpc18xx_pin_to_gpio(pctldev, pin); + if (gpio < 0) + return -ENOTSUPP; + + val = lpc18xx_gpio_to_pintsel_val(gpio); + + reg_offset += (param_val / LPC18XX_SCU_IRQ_PER_PINTSEL) * sizeof(u32); + + reg_val = readl(scu->base + reg_offset); + reg_val &= ~LPC18XX_SCU_PINTSEL_VAL(LPC18XX_SCU_PINTSEL_VAL_MASK, param_val); + reg_val |= LPC18XX_SCU_PINTSEL_VAL(val, param_val); + writel(reg_val, scu->base + reg_offset); + + return 0; +} + +static int lpc18xx_pconf_set_pin(struct pinctrl_dev *pctldev, unsigned param, + u16 param_val, u32 *reg, unsigned pin, struct lpc18xx_pin_caps *pin_cap) { switch (param) { @@ -948,6 +1071,9 @@ static int lpc18xx_pconf_set_pin(struct pinctrl_dev *pctldev, *reg |= param_val << LPC18XX_SCU_PIN_EHD_POS; break; + case PIN_CONFIG_GPIO_PIN_INT: + return lpc18xx_pconf_set_gpio_pin_int(pctldev, param_val, pin); + default: dev_err(pctldev->dev, "Property not supported\n"); return -ENOTSUPP; @@ -982,7 +1108,7 @@ static int lpc18xx_pconf_set(struct pinctrl_dev *pctldev, unsigned pin, else if (pin_cap->type == TYPE_USB1) ret = lpc18xx_pconf_set_usb1(pctldev, param, param_val, ®); else - ret = lpc18xx_pconf_set_pin(pctldev, param, param_val, ®, pin_cap); + ret = lpc18xx_pconf_set_pin(pctldev, param, param_val, ®, pin, pin_cap); if (ret) return ret; @@ -1136,6 +1262,11 @@ static struct pinctrl_desc lpc18xx_scu_desc = { .pctlops = &lpc18xx_pctl_ops, .pmxops = &lpc18xx_pmx_ops, .confops = &lpc18xx_pconf_ops, + .num_custom_params = ARRAY_SIZE(lpc18xx_params), + .custom_params = lpc18xx_params, +#ifdef CONFIG_DEBUG_FS + .custom_conf_items = lpc18xx_conf_items, +#endif .owner = THIS_MODULE, }; |