+// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2012 Vikram Narayananan
- *
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * 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.
*/
#include <common.h>
+#include <dm.h>
+#include <dm/pinctrl.h>
+#include <errno.h>
#include <asm/gpio.h>
#include <asm/io.h>
+#include <fdtdec.h>
-inline int gpio_is_valid(unsigned gpio)
-{
- return (gpio < BCM2835_GPIO_COUNT);
-}
-
-int gpio_request(unsigned gpio, const char *label)
-{
- return !gpio_is_valid(gpio);
-}
+struct bcm2835_gpios {
+ struct bcm2835_gpio_regs *reg;
+ struct udevice *pinctrl;
+};
-int gpio_free(unsigned gpio)
+static int bcm2835_gpio_direction_input(struct udevice *dev, unsigned gpio)
{
- return 0;
-}
-
-int gpio_direction_input(unsigned gpio)
-{
- struct bcm2835_gpio_regs *reg =
- (struct bcm2835_gpio_regs *)BCM2835_GPIO_BASE;
+ struct bcm2835_gpios *gpios = dev_get_priv(dev);
unsigned val;
- val = readl(®->gpfsel[BCM2835_GPIO_FSEL_BANK(gpio)]);
+ val = readl(&gpios->reg->gpfsel[BCM2835_GPIO_FSEL_BANK(gpio)]);
val &= ~(BCM2835_GPIO_FSEL_MASK << BCM2835_GPIO_FSEL_SHIFT(gpio));
val |= (BCM2835_GPIO_INPUT << BCM2835_GPIO_FSEL_SHIFT(gpio));
- writel(val, ®->gpfsel[BCM2835_GPIO_FSEL_BANK(gpio)]);
+ writel(val, &gpios->reg->gpfsel[BCM2835_GPIO_FSEL_BANK(gpio)]);
return 0;
}
-int gpio_direction_output(unsigned gpio, int value)
+static int bcm2835_gpio_direction_output(struct udevice *dev, unsigned int gpio,
+ int value)
{
- struct bcm2835_gpio_regs *reg =
- (struct bcm2835_gpio_regs *)BCM2835_GPIO_BASE;
+ struct bcm2835_gpios *gpios = dev_get_priv(dev);
unsigned val;
gpio_set_value(gpio, value);
- val = readl(®->gpfsel[BCM2835_GPIO_FSEL_BANK(gpio)]);
+ val = readl(&gpios->reg->gpfsel[BCM2835_GPIO_FSEL_BANK(gpio)]);
val &= ~(BCM2835_GPIO_FSEL_MASK << BCM2835_GPIO_FSEL_SHIFT(gpio));
val |= (BCM2835_GPIO_OUTPUT << BCM2835_GPIO_FSEL_SHIFT(gpio));
- writel(val, ®->gpfsel[BCM2835_GPIO_FSEL_BANK(gpio)]);
+ writel(val, &gpios->reg->gpfsel[BCM2835_GPIO_FSEL_BANK(gpio)]);
return 0;
}
-int gpio_get_value(unsigned gpio)
+static int bcm2835_get_value(const struct bcm2835_gpios *gpios, unsigned gpio)
{
- struct bcm2835_gpio_regs *reg =
- (struct bcm2835_gpio_regs *)BCM2835_GPIO_BASE;
unsigned val;
- val = readl(®->gplev[BCM2835_GPIO_COMMON_BANK(gpio)]);
+ val = readl(&gpios->reg->gplev[BCM2835_GPIO_COMMON_BANK(gpio)]);
return (val >> BCM2835_GPIO_COMMON_SHIFT(gpio)) & 0x1;
}
-int gpio_set_value(unsigned gpio, int value)
+static int bcm2835_gpio_get_value(struct udevice *dev, unsigned gpio)
{
- struct bcm2835_gpio_regs *reg =
- (struct bcm2835_gpio_regs *)BCM2835_GPIO_BASE;
- u32 *output_reg = value ? reg->gpset : reg->gpclr;
+ const struct bcm2835_gpios *gpios = dev_get_priv(dev);
+
+ return bcm2835_get_value(gpios, gpio);
+}
+
+static int bcm2835_gpio_set_value(struct udevice *dev, unsigned gpio,
+ int value)
+{
+ struct bcm2835_gpios *gpios = dev_get_priv(dev);
+ u32 *output_reg = value ? gpios->reg->gpset : gpios->reg->gpclr;
writel(1 << BCM2835_GPIO_COMMON_SHIFT(gpio),
&output_reg[BCM2835_GPIO_COMMON_BANK(gpio)]);
return 0;
}
+
+static int bcm2835_gpio_get_function(struct udevice *dev, unsigned offset)
+{
+ struct bcm2835_gpios *priv = dev_get_priv(dev);
+ int funcid;
+
+ funcid = pinctrl_get_gpio_mux(priv->pinctrl, 0, offset);
+
+ 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 = {
+ .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,
+};
+
+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_get_uclass_priv(dev);
+
+ uc_priv->bank_name = "GPIO";
+ uc_priv->gpio_count = BCM2835_GPIO_COUNT;
+ gpios->reg = (struct bcm2835_gpio_regs *)plat->base;
+
+ /* We know we're spawned by the pinctrl driver */
+ gpios->pinctrl = dev->parent;
+
+ return 0;
+}
+
+#if CONFIG_IS_ENABLED(OF_CONTROL)
+static int bcm2835_gpio_ofdata_to_platdata(struct udevice *dev)
+{
+ struct bcm2835_gpio_platdata *plat = dev_get_platdata(dev);
+ fdt_addr_t addr;
+
+ addr = dev_read_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,
+ .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),
+};
projects / u-boot.git / blobdiff