#include <errno.h>
#include <asm/gpio.h>
#include <asm/io.h>
-
-#define GPIO_NAME_SIZE 20
+#include <fdtdec.h>
struct bcm2835_gpios {
- char label[BCM2835_GPIO_COUNT][GPIO_NAME_SIZE];
struct bcm2835_gpio_regs *reg;
};
-/**
- * gpio_is_requested() - check if a GPIO has been requested
- *
- * @bank: Bank to check
- * @offset: GPIO offset within bank to check
- * @return true if marked as requested, false if not
- */
-static inline bool gpio_is_requested(struct bcm2835_gpios *gpios, int offset)
-{
- return *gpios->label[offset] != '\0';
-}
-
-static int check_requested(struct udevice *dev, unsigned offset,
- const char *func)
-{
- struct bcm2835_gpios *gpios = dev_get_priv(dev);
- struct gpio_dev_priv *uc_priv = dev->uclass_priv;
-
- if (!gpio_is_requested(gpios, offset)) {
- printf("omap_gpio: %s: error: gpio %s%d not requested\n",
- func, uc_priv->bank_name, offset);
- return -EPERM;
- }
-
- return 0;
-}
-
-static int bcm2835_gpio_request(struct udevice *dev, unsigned offset,
- const char *label)
-{
- struct bcm2835_gpios *gpios = dev_get_priv(dev);
-
- if (gpio_is_requested(gpios, offset))
- return -EBUSY;
-
- strncpy(gpios->label[offset], label, GPIO_NAME_SIZE);
- gpios->label[offset][GPIO_NAME_SIZE - 1] = '\0';
-
- return 0;
-}
-
-static int bcm2835_gpio_free(struct udevice *dev, unsigned offset)
-{
- struct bcm2835_gpios *gpios = dev_get_priv(dev);
- int ret;
-
- ret = check_requested(dev, offset, __func__);
- if (ret)
- return ret;
- gpios->label[offset][0] = '\0';
-
- return 0;
-}
-
static int bcm2835_gpio_direction_input(struct udevice *dev, unsigned gpio)
{
struct bcm2835_gpios *gpios = dev_get_priv(dev);
return 0;
}
-static bool bcm2835_gpio_is_output(const struct bcm2835_gpios *gpios, int gpio)
-{
- u32 val;
-
- val = readl(&gpios->reg->gpfsel[BCM2835_GPIO_FSEL_BANK(gpio)]);
- val &= BCM2835_GPIO_FSEL_MASK << BCM2835_GPIO_FSEL_SHIFT(gpio);
- return val ? true : false;
-}
-
static int bcm2835_get_value(const struct bcm2835_gpios *gpios, unsigned gpio)
{
unsigned val;
return 0;
}
-static int bcm2835_gpio_get_function(struct udevice *dev, unsigned offset)
+int bcm2835_gpio_get_func_id(struct udevice *dev, unsigned gpio)
{
struct bcm2835_gpios *gpios = dev_get_priv(dev);
+ u32 val;
- if (!gpio_is_requested(gpios, offset))
- return GPIOF_UNUSED;
+ val = readl(&gpios->reg->gpfsel[BCM2835_GPIO_FSEL_BANK(gpio)]);
- /* GPIOF_FUNC is not implemented yet */
- if (bcm2835_gpio_is_output(gpios, offset))
- return GPIOF_OUTPUT;
- else
- return GPIOF_INPUT;
+ return (val >> BCM2835_GPIO_FSEL_SHIFT(gpio) & BCM2835_GPIO_FSEL_MASK);
}
-static int bcm2835_gpio_get_state(struct udevice *dev, unsigned int offset,
- char *buf, int bufsize)
+static int bcm2835_gpio_get_function(struct udevice *dev, unsigned offset)
{
- struct gpio_dev_priv *uc_priv = dev->uclass_priv;
- struct bcm2835_gpios *gpios = dev_get_priv(dev);
- const char *label;
- bool requested;
- bool is_output;
- int size;
-
- label = gpios->label[offset];
- is_output = bcm2835_gpio_is_output(gpios, offset);
- size = snprintf(buf, bufsize, "%s%d: ",
- uc_priv->bank_name ? uc_priv->bank_name : "", offset);
- buf += size;
- bufsize -= size;
- requested = gpio_is_requested(gpios, offset);
- snprintf(buf, bufsize, "%s: %d [%c]%s%s",
- is_output ? "out" : " in",
- bcm2835_get_value(gpios, offset),
- requested ? 'x' : ' ',
- requested ? " " : "",
- label);
+ int funcid = bcm2835_gpio_get_func_id(dev, offset);
- return 0;
+ switch (funcid) {
+ case BCM2835_GPIO_OUTPUT:
+ return GPIOF_OUTPUT;
+ case BCM2835_GPIO_INPUT:
+ return GPIOF_INPUT;
+ default:
+ return GPIOF_FUNC;
+ }
}
+
static const struct dm_gpio_ops gpio_bcm2835_ops = {
- .request = bcm2835_gpio_request,
- .free = bcm2835_gpio_free,
.direction_input = bcm2835_gpio_direction_input,
.direction_output = bcm2835_gpio_direction_output,
.get_value = bcm2835_gpio_get_value,
.set_value = bcm2835_gpio_set_value,
.get_function = bcm2835_gpio_get_function,
- .get_state = bcm2835_gpio_get_state,
};
static int bcm2835_gpio_probe(struct udevice *dev)
{
struct bcm2835_gpios *gpios = dev_get_priv(dev);
struct bcm2835_gpio_platdata *plat = dev_get_platdata(dev);
- struct gpio_dev_priv *uc_priv = dev->uclass_priv;
+ struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
uc_priv->bank_name = "GPIO";
uc_priv->gpio_count = BCM2835_GPIO_COUNT;
return 0;
}
+#if CONFIG_IS_ENABLED(OF_CONTROL)
+static const struct udevice_id bcm2835_gpio_id[] = {
+ {.compatible = "brcm,bcm2835-gpio"},
+ {}
+};
+
+static int bcm2835_gpio_ofdata_to_platdata(struct udevice *dev)
+{
+ struct bcm2835_gpio_platdata *plat = dev_get_platdata(dev);
+ fdt_addr_t addr;
+
+ addr = devfdt_get_addr(dev);
+ if (addr == FDT_ADDR_T_NONE)
+ return -EINVAL;
+
+ plat->base = addr;
+ return 0;
+}
+#endif
+
U_BOOT_DRIVER(gpio_bcm2835) = {
.name = "gpio_bcm2835",
.id = UCLASS_GPIO,
+ .of_match = of_match_ptr(bcm2835_gpio_id),
+ .ofdata_to_platdata = of_match_ptr(bcm2835_gpio_ofdata_to_platdata),
+ .platdata_auto_alloc_size = sizeof(struct bcm2835_gpio_platdata),
.ops = &gpio_bcm2835_ops,
.probe = bcm2835_gpio_probe,
+ .flags = DM_FLAG_PRE_RELOC,
.priv_auto_alloc_size = sizeof(struct bcm2835_gpios),
};