diff options
Diffstat (limited to 'drivers/pinctrl/bcm')
| -rw-r--r-- | drivers/pinctrl/bcm/pinctrl-bcm2835.c | 105 |
1 files changed, 100 insertions, 5 deletions
diff --git a/drivers/pinctrl/bcm/pinctrl-bcm2835.c b/drivers/pinctrl/bcm/pinctrl-bcm2835.c index 183d1ffe6a75..a493205bedaf 100644 --- a/drivers/pinctrl/bcm/pinctrl-bcm2835.c +++ b/drivers/pinctrl/bcm/pinctrl-bcm2835.c @@ -57,15 +57,24 @@ #define GPAFEN0 0x88 /* Pin Async Falling Edge Detect */ #define GPPUD 0x94 /* Pin Pull-up/down Enable */ #define GPPUDCLK0 0x98 /* Pin Pull-up/down Enable Clock */ +#define GP_GPIO_PUP_PDN_CNTRL_REG0 0xe4 /* 2711 Pin Pull-up/down select */ #define FSEL_REG(p) (GPFSEL0 + (((p) / 10) * 4)) #define FSEL_SHIFT(p) (((p) % 10) * 3) #define GPIO_REG_OFFSET(p) ((p) / 32) #define GPIO_REG_SHIFT(p) ((p) % 32) +#define PUD_2711_MASK 0x3 +#define PUD_2711_REG_OFFSET(p) ((p) / 16) +#define PUD_2711_REG_SHIFT(p) (((p) % 16) * 2) + /* argument: bcm2835_pinconf_pull */ #define BCM2835_PINCONF_PARAM_PULL (PIN_CONFIG_END + 1) +#define BCM2711_PULL_NONE 0x0 +#define BCM2711_PULL_UP 0x1 +#define BCM2711_PULL_DOWN 0x2 + struct bcm2835_pinctrl { struct device *dev; void __iomem *base; @@ -975,6 +984,77 @@ static const struct pinconf_ops bcm2835_pinconf_ops = { .pin_config_set = bcm2835_pinconf_set, }; +static void bcm2711_pull_config_set(struct bcm2835_pinctrl *pc, + unsigned int pin, unsigned int arg) +{ + u32 shifter; + u32 value; + u32 off; + + off = PUD_2711_REG_OFFSET(pin); + shifter = PUD_2711_REG_SHIFT(pin); + + value = bcm2835_gpio_rd(pc, GP_GPIO_PUP_PDN_CNTRL_REG0 + (off * 4)); + value &= ~(PUD_2711_MASK << shifter); + value |= (arg << shifter); + bcm2835_gpio_wr(pc, GP_GPIO_PUP_PDN_CNTRL_REG0 + (off * 4), value); +} + +static int bcm2711_pinconf_set(struct pinctrl_dev *pctldev, + unsigned int pin, unsigned long *configs, + unsigned int num_configs) +{ + struct bcm2835_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev); + u32 param, arg; + int i; + + for (i = 0; i < num_configs; i++) { + param = pinconf_to_config_param(configs[i]); + arg = pinconf_to_config_argument(configs[i]); + + switch (param) { + /* convert legacy brcm,pull */ + case BCM2835_PINCONF_PARAM_PULL: + if (arg == BCM2835_PUD_UP) + arg = BCM2711_PULL_UP; + else if (arg == BCM2835_PUD_DOWN) + arg = BCM2711_PULL_DOWN; + else + arg = BCM2711_PULL_NONE; + + bcm2711_pull_config_set(pc, pin, arg); + break; + + /* Set pull generic bindings */ + case PIN_CONFIG_BIAS_DISABLE: + bcm2711_pull_config_set(pc, pin, BCM2711_PULL_NONE); + break; + case PIN_CONFIG_BIAS_PULL_DOWN: + bcm2711_pull_config_set(pc, pin, BCM2711_PULL_DOWN); + break; + case PIN_CONFIG_BIAS_PULL_UP: + bcm2711_pull_config_set(pc, pin, BCM2711_PULL_UP); + break; + + /* Set output-high or output-low */ + case PIN_CONFIG_OUTPUT: + bcm2835_gpio_set_bit(pc, arg ? GPSET0 : GPCLR0, pin); + break; + + default: + return -ENOTSUPP; + } + } /* for each config */ + + return 0; +} + +static const struct pinconf_ops bcm2711_pinconf_ops = { + .is_generic = true, + .pin_config_get = bcm2835_pinconf_get, + .pin_config_set = bcm2711_pinconf_set, +}; + static struct pinctrl_desc bcm2835_pinctrl_desc = { .name = MODULE_NAME, .pins = bcm2835_gpio_pins, @@ -990,6 +1070,18 @@ static struct pinctrl_gpio_range bcm2835_pinctrl_gpio_range = { .npins = BCM2835_NUM_GPIOS, }; +static const struct of_device_id bcm2835_pinctrl_match[] = { + { + .compatible = "brcm,bcm2835-gpio", + .data = &bcm2835_pinconf_ops, + }, + { + .compatible = "brcm,bcm2711-gpio", + .data = &bcm2711_pinconf_ops, + }, + {} +}; + static int bcm2835_pinctrl_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; @@ -997,6 +1089,8 @@ static int bcm2835_pinctrl_probe(struct platform_device *pdev) struct bcm2835_pinctrl *pc; struct resource iomem; int err, i; + const struct of_device_id *match; + BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_pins) != BCM2835_NUM_GPIOS); BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_groups) != BCM2835_NUM_GPIOS); @@ -1073,6 +1167,12 @@ static int bcm2835_pinctrl_probe(struct platform_device *pdev) bcm2835_gpio_irq_handler); } + match = of_match_node(bcm2835_pinctrl_match, pdev->dev.of_node); + if (match) { + bcm2835_pinctrl_desc.confops = + (const struct pinconf_ops *)match->data; + } + pc->pctl_dev = devm_pinctrl_register(dev, &bcm2835_pinctrl_desc, pc); if (IS_ERR(pc->pctl_dev)) { gpiochip_remove(&pc->gpio_chip); @@ -1087,11 +1187,6 @@ static int bcm2835_pinctrl_probe(struct platform_device *pdev) return 0; } -static const struct of_device_id bcm2835_pinctrl_match[] = { - { .compatible = "brcm,bcm2835-gpio" }, - {} -}; - static struct platform_driver bcm2835_pinctrl_driver = { .probe = bcm2835_pinctrl_probe, .driver = { |