+// 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
* Written by Juha Yrjölä <juha.yrjola@nokia.com>
*/
#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
-static inline const struct gpio_bank *get_gpio_bank(int gpio)
-{
- return &omap_gpio_bank[gpio >> 5];
-}
+#ifdef CONFIG_DM_GPIO
+
+#define GPIO_PER_BANK 32
+
+struct gpio_bank {
+ /* TODO(sjg@chromium.org): Can we use a struct here? */
+ void *base; /* address of registers in physical memory */
+};
+
+#endif
static inline int get_gpio_index(int gpio)
{
return (gpio >= 0) && (gpio < OMAP_MAX_GPIO);
}
-static int check_gpio(int gpio)
-{
- if (!gpio_is_valid(gpio)) {
- printf("ERROR : check_gpio: invalid GPIO %d\n", gpio);
- return -1;
- }
- return 0;
-}
-
static void _set_gpio_direction(const struct gpio_bank *bank, int gpio,
int is_input)
{
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;
+ if (enable)
+ reg += OMAP_GPIO_SETDATAOUT;
+ else
+ reg += OMAP_GPIO_CLEARDATAOUT;
+
+ l = 1 << gpio;
+ __raw_writel(l, reg);
+}
+
+static int _get_gpio_value(const struct gpio_bank *bank, int gpio)
+{
+ void *reg = bank->base;
+ int input;
+
+ 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:
- printf("omap3-gpio unknown bank method %s %d\n",
- __FILE__, __LINE__);
- return;
+ return -1;
}
- __raw_writel(l, reg);
+
+ return (__raw_readl(reg) & (1 << gpio)) != 0;
+}
+
+#ifndef CONFIG_DM_GPIO
+
+static inline const struct gpio_bank *get_gpio_bank(int gpio)
+{
+ return &omap_gpio_bank[gpio >> 5];
+}
+
+static int check_gpio(int gpio)
+{
+ if (!gpio_is_valid(gpio)) {
+ printf("ERROR : check_gpio: invalid GPIO %d\n", gpio);
+ return -1;
+ }
+ return 0;
}
/**
int gpio_get_value(unsigned gpio)
{
const struct gpio_bank *bank;
- void *reg;
- int input;
if (check_gpio(gpio) < 0)
return -1;
bank = get_gpio_bank(gpio);
- reg = bank->base;
- switch (bank->method) {
- case METHOD_GPIO_24XX:
- input = _get_gpio_direction(bank, get_gpio_index(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;
- }
- break;
- default:
- return -1;
- }
- return (__raw_readl(reg)
- & (1 << get_gpio_index(gpio))) != 0;
+
+ return _get_gpio_value(bank, get_gpio_index(gpio));
}
/**
{
return 0;
}
+
+#else /* new driver model interface CONFIG_DM_GPIO */
+
+/* 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);
+
+ /* Configure GPIO direction as input. */
+ _set_gpio_direction(bank, offset, 1);
+
+ return 0;
+}
+
+/* set GPIO pin 'gpio' as an output, with polarity 'value' */
+static int omap_gpio_direction_output(struct udevice *dev, unsigned offset,
+ int value)
+{
+ struct gpio_bank *bank = dev_get_priv(dev);
+
+ _set_gpio_dataout(bank, offset, value);
+ _set_gpio_direction(bank, offset, 0);
+
+ return 0;
+}
+
+/* read GPIO IN value of pin 'gpio' */
+static int omap_gpio_get_value(struct udevice *dev, unsigned offset)
+{
+ struct gpio_bank *bank = dev_get_priv(dev);
+
+ return _get_gpio_value(bank, offset);
+}
+
+/* write GPIO OUT value to pin 'gpio' */
+static int omap_gpio_set_value(struct udevice *dev, unsigned offset,
+ int value)
+{
+ struct gpio_bank *bank = dev_get_priv(dev);
+
+ _set_gpio_dataout(bank, offset, value);
+
+ return 0;
+}
+
+static int omap_gpio_get_function(struct udevice *dev, unsigned offset)
+{
+ struct gpio_bank *bank = dev_get_priv(dev);
+
+ /* GPIOF_FUNC is not implemented yet */
+ 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 = {
+ .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,
+};
+
+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_get_uclass_priv(dev);
+ int banknum;
+ char name[18], *str;
+
+ 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;
+ 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 */