+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2009 Wind River Systems, Inc.
* Tom Rix <Tom.Rix@windriver.com>
*
- * SPDX-License-Identifier: GPL-2.0
- *
* This work is derived from the linux 2.6.27 kernel source
* To fetch, use the kernel repository
* git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
*/
#include <common.h>
#include <dm.h>
+#include <fdtdec.h>
#include <asm/gpio.h>
#include <asm/io.h>
-#include <asm/errno.h>
+#include <linux/errno.h>
+#include <malloc.h>
+
+DECLARE_GLOBAL_DATA_PTR;
#define OMAP_GPIO_DIR_OUT 0
#define OMAP_GPIO_DIR_IN 1
#ifdef CONFIG_DM_GPIO
-#define GPIO_NAME_SIZE 20
#define GPIO_PER_BANK 32
struct gpio_bank {
- char label[GPIO_PER_BANK][GPIO_NAME_SIZE];
/* TODO(sjg@chromium.org): Can we use a struct here? */
void *base; /* address of registers in physical memory */
- enum gpio_method method;
};
#endif
void *reg = bank->base;
u32 l;
- switch (bank->method) {
- case METHOD_GPIO_24XX:
- reg += OMAP_GPIO_OE;
- break;
- default:
- return;
- }
+ reg += OMAP_GPIO_OE;
+
l = __raw_readl(reg);
if (is_input)
l |= 1 << gpio;
void *reg = bank->base;
u32 v;
- switch (bank->method) {
- case METHOD_GPIO_24XX:
- reg += OMAP_GPIO_OE;
- break;
- default:
- return -1;
- }
+ reg += OMAP_GPIO_OE;
v = __raw_readl(reg);
void *reg = bank->base;
u32 l = 0;
- switch (bank->method) {
- case METHOD_GPIO_24XX:
- if (enable)
- reg += OMAP_GPIO_SETDATAOUT;
- else
- reg += OMAP_GPIO_CLEARDATAOUT;
- l = 1 << gpio;
- break;
- default:
- printf("omap3-gpio unknown bank method %s %d\n",
- __FILE__, __LINE__);
- return;
- }
+ if (enable)
+ reg += OMAP_GPIO_SETDATAOUT;
+ else
+ reg += OMAP_GPIO_CLEARDATAOUT;
+
+ l = 1 << gpio;
__raw_writel(l, reg);
}
void *reg = bank->base;
int input;
- switch (bank->method) {
- case METHOD_GPIO_24XX:
- input = _get_gpio_direction(bank, gpio);
- switch (input) {
- case OMAP_GPIO_DIR_IN:
- reg += OMAP_GPIO_DATAIN;
- break;
- case OMAP_GPIO_DIR_OUT:
- reg += OMAP_GPIO_DATAOUT;
- break;
- default:
- return -1;
- }
+ input = _get_gpio_direction(bank, gpio);
+ switch (input) {
+ case OMAP_GPIO_DIR_IN:
+ reg += OMAP_GPIO_DATAIN;
+ break;
+ case OMAP_GPIO_DIR_OUT:
+ reg += OMAP_GPIO_DATAOUT;
break;
default:
return -1;
#else /* new driver model interface CONFIG_DM_GPIO */
-/**
- * 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 gpio_bank *bank, int offset)
-{
- return *bank->label[offset] != '\0';
-}
-
-static int omap_gpio_is_output(struct gpio_bank *bank, int offset)
-{
- return _get_gpio_direction(bank, offset) == OMAP_GPIO_DIR_OUT;
-}
-
-static int check_requested(struct udevice *dev, unsigned offset,
- const char *func)
-{
- struct gpio_bank *bank = dev_get_priv(dev);
- struct gpio_dev_priv *uc_priv = dev->uclass_priv;
-
- if (!gpio_is_requested(bank, offset)) {
- printf("omap_gpio: %s: error: gpio %s%d not requested\n",
- func, uc_priv->bank_name, offset);
- return -EPERM;
- }
-
- return 0;
-}
-
/* set GPIO pin 'gpio' as an input */
static int omap_gpio_direction_input(struct udevice *dev, unsigned offset)
{
struct gpio_bank *bank = dev_get_priv(dev);
- int ret;
-
- ret = check_requested(dev, offset, __func__);
- if (ret)
- return ret;
/* Configure GPIO direction as input. */
_set_gpio_direction(bank, offset, 1);
int value)
{
struct gpio_bank *bank = dev_get_priv(dev);
- int ret;
-
- ret = check_requested(dev, offset, __func__);
- if (ret)
- return ret;
_set_gpio_dataout(bank, offset, value);
_set_gpio_direction(bank, offset, 0);
static int omap_gpio_get_value(struct udevice *dev, unsigned offset)
{
struct gpio_bank *bank = dev_get_priv(dev);
- int ret;
-
- ret = check_requested(dev, offset, __func__);
- if (ret)
- return ret;
return _get_gpio_value(bank, offset);
}
int value)
{
struct gpio_bank *bank = dev_get_priv(dev);
- int ret;
-
- ret = check_requested(dev, offset, __func__);
- if (ret)
- return ret;
_set_gpio_dataout(bank, offset, value);
return 0;
}
-static int omap_gpio_get_state(struct udevice *dev, unsigned int offset,
- char *buf, int bufsize)
-{
- struct gpio_dev_priv *uc_priv = dev->uclass_priv;
- struct gpio_bank *bank = dev_get_priv(dev);
- const char *label;
- bool requested;
- bool is_output;
- int size;
-
- label = bank->label[offset];
- is_output = omap_gpio_is_output(bank->base, offset);
- size = snprintf(buf, bufsize, "%s%d: ",
- uc_priv->bank_name ? uc_priv->bank_name : "", offset);
- buf += size;
- bufsize -= size;
- requested = gpio_is_requested(bank, offset);
- snprintf(buf, bufsize, "%s: %d [%c]%s%s",
- is_output ? "out" : " in",
- _get_gpio_value(bank, offset),
- requested ? 'x' : ' ',
- requested ? " " : "",
- label);
-
- return 0;
-}
-
-static int omap_gpio_request(struct udevice *dev, unsigned offset,
- const char *label)
-{
- struct gpio_bank *bank = dev_get_priv(dev);
-
- if (gpio_is_requested(bank, offset))
- return -EBUSY;
-
- strncpy(bank->label[offset], label, GPIO_NAME_SIZE);
- bank->label[offset][GPIO_NAME_SIZE - 1] = '\0';
-
- return 0;
-}
-
-static int omap_gpio_free(struct udevice *dev, unsigned offset)
-{
- struct gpio_bank *bank = dev_get_priv(dev);
- int ret;
-
- ret = check_requested(dev, offset, __func__);
- if (ret)
- return ret;
- bank->label[offset][0] = '\0';
-
- return 0;
-}
-
static int omap_gpio_get_function(struct udevice *dev, unsigned offset)
{
struct gpio_bank *bank = dev_get_priv(dev);
- if (!gpio_is_requested(bank, offset))
- return GPIOF_UNUSED;
-
/* GPIOF_FUNC is not implemented yet */
- if (_get_gpio_direction(bank->base, offset))
+ if (_get_gpio_direction(bank, offset) == OMAP_GPIO_DIR_OUT)
return GPIOF_OUTPUT;
else
return GPIOF_INPUT;
}
static const struct dm_gpio_ops gpio_omap_ops = {
- .request = omap_gpio_request,
- .free = omap_gpio_free,
.direction_input = omap_gpio_direction_input,
.direction_output = omap_gpio_direction_output,
.get_value = omap_gpio_get_value,
.set_value = omap_gpio_set_value,
.get_function = omap_gpio_get_function,
- .get_state = omap_gpio_get_state,
};
static int omap_gpio_probe(struct udevice *dev)
{
struct gpio_bank *bank = dev_get_priv(dev);
struct omap_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);
+ int banknum;
char name[18], *str;
- sprintf(name, "GPIO%d_", plat->bank_index);
+ banknum = plat->bank_index;
+ sprintf(name, "GPIO%d_", banknum + 1);
str = strdup(name);
if (!str)
return -ENOMEM;
uc_priv->bank_name = str;
uc_priv->gpio_count = GPIO_PER_BANK;
bank->base = (void *)plat->base;
- bank->method = plat->method;
+ return 0;
+}
+
+static int omap_gpio_bind(struct udevice *dev)
+{
+ struct omap_gpio_platdata *plat = dev_get_platdata(dev);
+ fdt_addr_t base_addr;
+
+ if (plat)
+ return 0;
+
+ base_addr = devfdt_get_addr(dev);
+ if (base_addr == FDT_ADDR_T_NONE)
+ return -EINVAL;
+
+ /*
+ * TODO:
+ * When every board is converted to driver model and DT is
+ * supported, this can be done by auto-alloc feature, but
+ * not using calloc to alloc memory for platdata.
+ *
+ * For example am33xx_gpio uses platform data rather than device tree.
+ *
+ * NOTE: DO NOT COPY this code if you are using device tree.
+ */
+ plat = calloc(1, sizeof(*plat));
+ if (!plat)
+ return -ENOMEM;
+
+ plat->base = base_addr;
+ plat->port_name = fdt_get_name(gd->fdt_blob, dev_of_offset(dev), NULL);
+ dev->platdata = plat;
return 0;
}
+static const struct udevice_id omap_gpio_ids[] = {
+ { .compatible = "ti,omap3-gpio" },
+ { .compatible = "ti,omap4-gpio" },
+ { .compatible = "ti,am4372-gpio" },
+ { }
+};
+
U_BOOT_DRIVER(gpio_omap) = {
.name = "gpio_omap",
.id = UCLASS_GPIO,
.ops = &gpio_omap_ops,
+ .of_match = omap_gpio_ids,
+ .bind = omap_gpio_bind,
.probe = omap_gpio_probe,
.priv_auto_alloc_size = sizeof(struct gpio_bank),
+ .flags = DM_FLAG_PRE_RELOC,
};
#endif /* CONFIG_DM_GPIO */
projects / u-boot / blobdiff