diff options
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/sandbox.c | 217 |
1 files changed, 139 insertions, 78 deletions
diff --git a/drivers/gpio/sandbox.c b/drivers/gpio/sandbox.c index 3c6cfec..22b6a5f 100644 --- a/drivers/gpio/sandbox.c +++ b/drivers/gpio/sandbox.c @@ -4,8 +4,13 @@ */ #include <common.h> +#include <dm.h> +#include <fdtdec.h> +#include <malloc.h> #include <asm/gpio.h> +DECLARE_GLOBAL_DATA_PTR; + /* Flags for each GPIO */ #define GPIOF_OUTPUT (1 << 0) /* Currently set as an output */ #define GPIOF_HIGH (1 << 1) /* Currently set high */ @@ -16,34 +21,30 @@ struct gpio_state { u8 flags; /* flags (GPIOF_...) */ }; -/* - * State of GPIOs - * TODO: Put this into sandbox state - */ -static struct gpio_state state[CONFIG_SANDBOX_GPIO_COUNT]; - /* Access routines for GPIO state */ -static u8 *get_gpio_flags(unsigned gp) +static u8 *get_gpio_flags(struct device *dev, unsigned offset) { - /* assert()'s could be disabled, so make sure we handle that */ - assert(gp < ARRAY_SIZE(state)); - if (gp >= ARRAY_SIZE(state)) { + struct gpio_dev_priv *uc_priv = dev->uclass_priv; + struct gpio_state *state = dev_get_priv(dev); + + if (offset >= uc_priv->gpio_count) { static u8 invalid_flags; - printf("sandbox_gpio: error: invalid gpio %u\n", gp); + printf("sandbox_gpio: error: invalid gpio %u\n", offset); return &invalid_flags; } - return &state[gp].flags; + return &state[offset].flags; } -static int get_gpio_flag(unsigned gp, int flag) +static int get_gpio_flag(struct device *dev, unsigned offset, int flag) { - return (*get_gpio_flags(gp) & flag) != 0; + return (*get_gpio_flags(dev, offset) & flag) != 0; } -static int set_gpio_flag(unsigned gp, int flag, int value) +static int set_gpio_flag(struct device *dev, unsigned offset, int flag, + int value) { - u8 *gpio = get_gpio_flags(gp); + u8 *gpio = get_gpio_flags(dev, offset); if (value) *gpio |= flag; @@ -53,11 +54,12 @@ static int set_gpio_flag(unsigned gp, int flag, int value) return 0; } -static int check_reserved(unsigned gpio, const char *func) +static int check_reserved(struct device *dev, unsigned offset, + const char *func) { - if (!get_gpio_flag(gpio, GPIOF_RESERVED)) { - printf("sandbox_gpio: %s: error: gpio %u not reserved\n", - func, gpio); + if (!get_gpio_flag(dev, offset, GPIOF_RESERVED)) { + printf("sandbox_gpio: %s: error: offset %u not reserved\n", + func, offset); return -1; } @@ -68,126 +70,185 @@ static int check_reserved(unsigned gpio, const char *func) * Back-channel sandbox-internal-only access to GPIO state */ -int sandbox_gpio_get_value(unsigned gp) +int sandbox_gpio_get_value(struct device *dev, unsigned offset) { - if (get_gpio_flag(gp, GPIOF_OUTPUT)) - debug("sandbox_gpio: get_value on output gpio %u\n", gp); - return get_gpio_flag(gp, GPIOF_HIGH); + if (get_gpio_flag(dev, offset, GPIOF_OUTPUT)) + debug("sandbox_gpio: get_value on output gpio %u\n", offset); + return get_gpio_flag(dev, offset, GPIOF_HIGH); } -int sandbox_gpio_set_value(unsigned gp, int value) +int sandbox_gpio_set_value(struct device *dev, unsigned offset, int value) { - return set_gpio_flag(gp, GPIOF_HIGH, value); + return set_gpio_flag(dev, offset, GPIOF_HIGH, value); } -int sandbox_gpio_get_direction(unsigned gp) +int sandbox_gpio_get_direction(struct device *dev, unsigned offset) { - return get_gpio_flag(gp, GPIOF_OUTPUT); + return get_gpio_flag(dev, offset, GPIOF_OUTPUT); } -int sandbox_gpio_set_direction(unsigned gp, int output) +int sandbox_gpio_set_direction(struct device *dev, unsigned offset, int output) { - return set_gpio_flag(gp, GPIOF_OUTPUT, output); + return set_gpio_flag(dev, offset, GPIOF_OUTPUT, output); } /* * These functions implement the public interface within U-Boot */ -/* set GPIO port 'gp' as an input */ -int gpio_direction_input(unsigned gp) +/* set GPIO port 'offset' as an input */ +static int sb_gpio_direction_input(struct device *dev, unsigned offset) { - debug("%s: gp:%u\n", __func__, gp); + debug("%s: offset:%u\n", __func__, offset); - if (check_reserved(gp, __func__)) + if (check_reserved(dev, offset, __func__)) return -1; - return sandbox_gpio_set_direction(gp, 0); + return sandbox_gpio_set_direction(dev, offset, 0); } -/* set GPIO port 'gp' as an output, with polarity 'value' */ -int gpio_direction_output(unsigned gp, int value) +/* set GPIO port 'offset' as an output, with polarity 'value' */ +static int sb_gpio_direction_output(struct device *dev, unsigned offset, + int value) { - debug("%s: gp:%u, value = %d\n", __func__, gp, value); + debug("%s: offset:%u, value = %d\n", __func__, offset, value); - if (check_reserved(gp, __func__)) + if (check_reserved(dev, offset, __func__)) return -1; - return sandbox_gpio_set_direction(gp, 1) | - sandbox_gpio_set_value(gp, value); + return sandbox_gpio_set_direction(dev, offset, 1) | + sandbox_gpio_set_value(dev, offset, value); } -/* read GPIO IN value of port 'gp' */ -int gpio_get_value(unsigned gp) +/* read GPIO IN value of port 'offset' */ +static int sb_gpio_get_value(struct device *dev, unsigned offset) { - debug("%s: gp:%u\n", __func__, gp); + debug("%s: offset:%u\n", __func__, offset); - if (check_reserved(gp, __func__)) + if (check_reserved(dev, offset, __func__)) return -1; - return sandbox_gpio_get_value(gp); + return sandbox_gpio_get_value(dev, offset); } -/* write GPIO OUT value to port 'gp' */ -int gpio_set_value(unsigned gp, int value) +/* write GPIO OUT value to port 'offset' */ +static int sb_gpio_set_value(struct device *dev, unsigned offset, int value) { - debug("%s: gp:%u, value = %d\n", __func__, gp, value); + debug("%s: offset:%u, value = %d\n", __func__, offset, value); - if (check_reserved(gp, __func__)) + if (check_reserved(dev, offset, __func__)) return -1; - if (!sandbox_gpio_get_direction(gp)) { - printf("sandbox_gpio: error: set_value on input gpio %u\n", gp); + if (!sandbox_gpio_get_direction(dev, offset)) { + printf("sandbox_gpio: error: set_value on input gpio %u\n", + offset); return -1; } - return sandbox_gpio_set_value(gp, value); + return sandbox_gpio_set_value(dev, offset, value); } -int gpio_request(unsigned gp, const char *label) +static int sb_gpio_request(struct device *dev, unsigned offset, + const char *label) { - debug("%s: gp:%u, label:%s\n", __func__, gp, label); + struct gpio_dev_priv *uc_priv = dev->uclass_priv; + struct gpio_state *state = dev_get_priv(dev); + + debug("%s: offset:%u, label:%s\n", __func__, offset, label); - if (gp >= ARRAY_SIZE(state)) { - printf("sandbox_gpio: error: invalid gpio %u\n", gp); + if (offset >= uc_priv->gpio_count) { + printf("sandbox_gpio: error: invalid gpio %u\n", offset); return -1; } - if (get_gpio_flag(gp, GPIOF_RESERVED)) { - printf("sandbox_gpio: error: gpio %u already reserved\n", gp); + if (get_gpio_flag(dev, offset, GPIOF_RESERVED)) { + printf("sandbox_gpio: error: gpio %u already reserved\n", + offset); return -1; } - state[gp].label = label; - return set_gpio_flag(gp, GPIOF_RESERVED, 1); + state[offset].label = label; + return set_gpio_flag(dev, offset, GPIOF_RESERVED, 1); } -int gpio_free(unsigned gp) +static int sb_gpio_free(struct device *dev, unsigned offset) { - debug("%s: gp:%u\n", __func__, gp); + struct gpio_state *state = dev_get_priv(dev); + + debug("%s: offset:%u\n", __func__, offset); - if (check_reserved(gp, __func__)) + if (check_reserved(dev, offset, __func__)) return -1; - state[gp].label = NULL; - return set_gpio_flag(gp, GPIOF_RESERVED, 0); + state[offset].label = NULL; + return set_gpio_flag(dev, offset, GPIOF_RESERVED, 0); } -/* Display GPIO information */ -void gpio_info(void) +static int sb_gpio_get_state(struct device *dev, unsigned int offset, + char *buf, int bufsize) { - unsigned gpio; + struct gpio_dev_priv *uc_priv = dev->uclass_priv; + struct gpio_state *state = dev_get_priv(dev); + const char *label; + + label = state[offset].label; + snprintf(buf, bufsize, "%s%d: %s: %d [%c]%s%s", + uc_priv->bank_name ? uc_priv->bank_name : "", offset, + sandbox_gpio_get_direction(dev, offset) ? "out" : " in", + sandbox_gpio_get_value(dev, offset), + get_gpio_flag(dev, offset, GPIOF_RESERVED) ? 'x' : ' ', + label ? " " : "", + label ? label : ""); - puts("Sandbox GPIOs\n"); + return 0; +} + +static const struct dm_gpio_ops gpio_sandbox_ops = { + .request = sb_gpio_request, + .free = sb_gpio_free, + .direction_input = sb_gpio_direction_input, + .direction_output = sb_gpio_direction_output, + .get_value = sb_gpio_get_value, + .set_value = sb_gpio_set_value, + .get_state = sb_gpio_get_state, +}; + +static int sandbox_gpio_ofdata_to_platdata(struct device *dev) +{ + struct gpio_dev_priv *uc_priv = dev->uclass_priv; - for (gpio = 0; gpio < ARRAY_SIZE(state); ++gpio) { - const char *label = state[gpio].label; + uc_priv->gpio_count = fdtdec_get_int(gd->fdt_blob, dev->of_offset, + "num-gpios", 0); + uc_priv->bank_name = fdt_getprop(gd->fdt_blob, dev->of_offset, + "gpio-bank-name", NULL); - printf("%4d: %s: %d [%c] %s\n", - gpio, - sandbox_gpio_get_direction(gpio) ? "out" : " in", - sandbox_gpio_get_value(gpio), - get_gpio_flag(gpio, GPIOF_RESERVED) ? 'x' : ' ', - label ? label : ""); + return 0; +} + +static int gpio_sandbox_probe(struct device *dev) +{ + struct gpio_dev_priv *uc_priv = dev->uclass_priv; + + if (dev->of_offset == -1) { + /* Tell the uclass how many GPIOs we have */ + uc_priv->gpio_count = CONFIG_SANDBOX_GPIO_COUNT; } + + dev->priv = calloc(sizeof(struct gpio_state), uc_priv->gpio_count); + + return 0; } + +static const struct device_id sandbox_gpio_ids[] = { + { .compatible = "sandbox,gpio" }, + { } +}; + +U_BOOT_DRIVER(gpio_sandbox) = { + .name = "gpio_sandbox", + .id = UCLASS_GPIO, + .of_match = sandbox_gpio_ids, + .ofdata_to_platdata = sandbox_gpio_ofdata_to_platdata, + .probe = gpio_sandbox_probe, + .ops = &gpio_sandbox_ops, +}; |