diff options
Diffstat (limited to 'drivers/pinctrl/pinctrl-coh901.c')
| -rw-r--r-- | drivers/pinctrl/pinctrl-coh901.c | 139 |
1 files changed, 88 insertions, 51 deletions
diff --git a/drivers/pinctrl/pinctrl-coh901.c b/drivers/pinctrl/pinctrl-coh901.c index 69fb7072a23e..0797eba3e33a 100644 --- a/drivers/pinctrl/pinctrl-coh901.c +++ b/drivers/pinctrl/pinctrl-coh901.c @@ -22,38 +22,10 @@ #include <linux/gpio.h> #include <linux/list.h> #include <linux/slab.h> -#include <linux/pinctrl/pinmux.h> +#include <linux/pinctrl/consumer.h> +#include <linux/pinctrl/pinconf-generic.h> #include <mach/gpio-u300.h> - -/* - * Bias modes for U300 GPIOs - * - * GPIO_U300_CONFIG_BIAS_UNKNOWN: this bias mode is not known to us - * GPIO_U300_CONFIG_BIAS_FLOAT: no specific bias, the GPIO will float or state - * is not controlled by software - * GPIO_U300_CONFIG_BIAS_PULL_UP: the GPIO will be pulled up (usually with high - * impedance to VDD) - */ -#define GPIO_U300_CONFIG_BIAS_UNKNOWN 0x1000 -#define GPIO_U300_CONFIG_BIAS_FLOAT 0x1001 -#define GPIO_U300_CONFIG_BIAS_PULL_UP 0x1002 - -/* - * Drive modes for U300 GPIOs (output) - * - * GPIO_U300_CONFIG_DRIVE_PUSH_PULL: the GPIO will be driven actively high and - * low, this is the most typical case and is typically achieved with two - * active transistors on the output - * GPIO_U300_CONFIG_DRIVE_OPEN_DRAIN: the GPIO will be driven with open drain - * (open collector) which means it is usually wired with other output - * ports which are then pulled up with an external resistor - * GPIO_U300_CONFIG_DRIVE_OPEN_SOURCE: the GPIO will be driven with open drain - * (open emitter) which is the same as open drain mutatis mutandis but - * pulled to ground - */ -#define GPIO_U300_CONFIG_DRIVE_PUSH_PULL 0x2000 -#define GPIO_U300_CONFIG_DRIVE_OPEN_DRAIN 0x2001 -#define GPIO_U300_CONFIG_DRIVE_OPEN_SOURCE 0x2002 +#include "pinctrl-coh901.h" /* * Register definitions for COH 901 335 variant @@ -181,12 +153,12 @@ struct u300_gpio_confdata { #define BS365_GPIO_NUM_PORTS 5 #define U300_FLOATING_INPUT { \ - .bias_mode = GPIO_U300_CONFIG_BIAS_FLOAT, \ + .bias_mode = PIN_CONFIG_BIAS_HIGH_IMPEDANCE, \ .output = false, \ } #define U300_PULL_UP_INPUT { \ - .bias_mode = GPIO_U300_CONFIG_BIAS_PULL_UP, \ + .bias_mode = PIN_CONFIG_BIAS_PULL_UP, \ .output = false, \ } @@ -360,14 +332,14 @@ static int u300_gpio_request(struct gpio_chip *chip, unsigned offset) */ int gpio = chip->base + offset; - return pinmux_request_gpio(gpio); + return pinctrl_request_gpio(gpio); } static void u300_gpio_free(struct gpio_chip *chip, unsigned offset) { int gpio = chip->base + offset; - pinmux_free_gpio(gpio); + pinctrl_free_gpio(gpio); } static int u300_gpio_get(struct gpio_chip *chip, unsigned offset) @@ -448,8 +420,68 @@ static int u300_gpio_to_irq(struct gpio_chip *chip, unsigned offset) return retirq; } -static int u300_gpio_config(struct gpio_chip *chip, unsigned offset, - u16 param, unsigned long *data) +/* Returning -EINVAL means "supported but not available" */ +int u300_gpio_config_get(struct gpio_chip *chip, + unsigned offset, + unsigned long *config) +{ + struct u300_gpio *gpio = to_u300_gpio(chip); + enum pin_config_param param = (enum pin_config_param) *config; + bool biasmode; + u32 drmode; + + /* One bit per pin, clamp to bool range */ + biasmode = !!(readl(U300_PIN_REG(offset, per)) & U300_PIN_BIT(offset)); + + /* Mask out the two bits for this pin and shift to bits 0,1 */ + drmode = readl(U300_PIN_REG(offset, pcr)); + drmode &= (U300_GPIO_PXPCR_PIN_MODE_MASK << ((offset & 0x07) << 1)); + drmode >>= ((offset & 0x07) << 1); + + switch(param) { + case PIN_CONFIG_BIAS_HIGH_IMPEDANCE: + *config = 0; + if (biasmode) + return 0; + else + return -EINVAL; + break; + case PIN_CONFIG_BIAS_PULL_UP: + *config = 0; + if (!biasmode) + return 0; + else + return -EINVAL; + break; + case PIN_CONFIG_DRIVE_PUSH_PULL: + *config = 0; + if (drmode == U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL) + return 0; + else + return -EINVAL; + break; + case PIN_CONFIG_DRIVE_OPEN_DRAIN: + *config = 0; + if (drmode == U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_DRAIN) + return 0; + else + return -EINVAL; + break; + case PIN_CONFIG_DRIVE_OPEN_SOURCE: + *config = 0; + if (drmode == U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_SOURCE) + return 0; + else + return -EINVAL; + break; + default: + break; + } + return -ENOTSUPP; +} + +int u300_gpio_config_set(struct gpio_chip *chip, unsigned offset, + enum pin_config_param param) { struct u300_gpio *gpio = to_u300_gpio(chip); unsigned long flags; @@ -457,16 +489,16 @@ static int u300_gpio_config(struct gpio_chip *chip, unsigned offset, local_irq_save(flags); switch (param) { - case GPIO_U300_CONFIG_BIAS_UNKNOWN: - case GPIO_U300_CONFIG_BIAS_FLOAT: + case PIN_CONFIG_BIAS_DISABLE: + case PIN_CONFIG_BIAS_HIGH_IMPEDANCE: val = readl(U300_PIN_REG(offset, per)); writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, per)); break; - case GPIO_U300_CONFIG_BIAS_PULL_UP: + case PIN_CONFIG_BIAS_PULL_UP: val = readl(U300_PIN_REG(offset, per)); writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, per)); break; - case GPIO_U300_CONFIG_DRIVE_PUSH_PULL: + case PIN_CONFIG_DRIVE_PUSH_PULL: val = readl(U300_PIN_REG(offset, pcr)); val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << ((offset & 0x07) << 1)); @@ -474,7 +506,7 @@ static int u300_gpio_config(struct gpio_chip *chip, unsigned offset, << ((offset & 0x07) << 1)); writel(val, U300_PIN_REG(offset, pcr)); break; - case GPIO_U300_CONFIG_DRIVE_OPEN_DRAIN: + case PIN_CONFIG_DRIVE_OPEN_DRAIN: val = readl(U300_PIN_REG(offset, pcr)); val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << ((offset & 0x07) << 1)); @@ -482,7 +514,7 @@ static int u300_gpio_config(struct gpio_chip *chip, unsigned offset, << ((offset & 0x07) << 1)); writel(val, U300_PIN_REG(offset, pcr)); break; - case GPIO_U300_CONFIG_DRIVE_OPEN_SOURCE: + case PIN_CONFIG_DRIVE_OPEN_SOURCE: val = readl(U300_PIN_REG(offset, pcr)); val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << ((offset & 0x07) << 1)); @@ -650,13 +682,12 @@ static void __init u300_gpio_init_pin(struct u300_gpio *gpio, u300_gpio_direction_output(&gpio->chip, offset, conf->outval); /* Deactivate bias mode for output */ - u300_gpio_config(&gpio->chip, offset, - GPIO_U300_CONFIG_BIAS_FLOAT, - NULL); + u300_gpio_config_set(&gpio->chip, offset, + PIN_CONFIG_BIAS_HIGH_IMPEDANCE); /* Set drive mode for output */ - u300_gpio_config(&gpio->chip, offset, - GPIO_U300_CONFIG_DRIVE_PUSH_PULL, NULL); + u300_gpio_config_set(&gpio->chip, offset, + PIN_CONFIG_DRIVE_PUSH_PULL); dev_dbg(gpio->dev, "set up pin %d as output, value: %d\n", offset, conf->outval); @@ -667,7 +698,7 @@ static void __init u300_gpio_init_pin(struct u300_gpio *gpio, u300_gpio_set(&gpio->chip, offset, 0); /* Set bias mode for input */ - u300_gpio_config(&gpio->chip, offset, conf->bias_mode, NULL); + u300_gpio_config_set(&gpio->chip, offset, conf->bias_mode); dev_dbg(gpio->dev, "set up pin %d as input, bias: %04x\n", offset, conf->bias_mode); @@ -705,7 +736,6 @@ static inline void u300_gpio_free_ports(struct u300_gpio *gpio) list_for_each_safe(p, n, &gpio->port_list) { port = list_entry(p, struct u300_gpio_port, node); list_del(&port->node); - free_irq(port->irq, port); kfree(port); } } @@ -861,10 +891,18 @@ static int __init u300_gpio_probe(struct platform_device *pdev) goto err_no_chip; } + /* Spawn pin controller device as child of the GPIO, pass gpio chip */ + plat->pinctrl_device->dev.platform_data = &gpio->chip; + err = platform_device_register(plat->pinctrl_device); + if (err) + goto err_no_pinctrl; + platform_set_drvdata(pdev, gpio); return 0; +err_no_pinctrl: + err = gpiochip_remove(&gpio->chip); err_no_chip: err_no_port: u300_gpio_free_ports(gpio); @@ -919,7 +957,6 @@ static struct platform_driver u300_gpio_driver = { .remove = __exit_p(u300_gpio_remove), }; - static int __init u300_gpio_init(void) { return platform_driver_probe(&u300_gpio_driver, u300_gpio_probe); |