* Copyright (c) 2009 Wind River Systems, Inc.
* Tom Rix <Tom.Rix@windriver.com>
*
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
+ * SPDX-License-Identifier: GPL-2.0
*
* This work is derived from the linux 2.6.27 kernel source
* To fetch, use the kernel repository
*
* Copyright (C) 2003-2005 Nokia Corporation
* Written by Juha Yrjölä <juha.yrjola@nokia.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
*/
#include <common.h>
+#include <dm.h>
#include <asm/gpio.h>
#include <asm/io.h>
#include <asm/errno.h>
#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 */
+ enum gpio_method method;
+};
+
+#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)
{
__raw_writel(l, reg);
}
+static int _get_gpio_value(const struct gpio_bank *bank, int gpio)
+{
+ 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;
+ }
+ break;
+ default:
+ return -1;
+ }
+
+ 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;
+}
+
/**
* Set value of the specified gpio
*/
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->base, 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->uclass_priv;
+ char name[18], *str;
+
+ sprintf(name, "GPIO%d_", plat->bank_index);
+ 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;
+}
+
+U_BOOT_DRIVER(gpio_omap) = {
+ .name = "gpio_omap",
+ .id = UCLASS_GPIO,
+ .ops = &gpio_omap_ops,
+ .probe = omap_gpio_probe,
+ .priv_auto_alloc_size = sizeof(struct gpio_bank),
+};
+
+#endif /* CONFIG_DM_GPIO */
projects / karo-tx-uboot.git / blobdiff