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authorTomaz Solc <tomaz.solc@tablix.org>2019-02-18 12:32:15 +0100
committerSascha Hauer <s.hauer@pengutronix.de>2019-02-19 10:07:44 +0100
commitbe717102c8ba2d0ea0225e9fe0590fd71e24caf4 (patch)
tree52d089e3ba913e64d7db9e207c077ebe7cf7459b /drivers/pinctrl
parentf959a76d540cf34c49d6f2c85914b274e8614d6f (diff)
downloadbarebox-be717102c8ba2d0ea0225e9fe0590fd71e24caf4.tar.gz
barebox-be717102c8ba2d0ea0225e9fe0590fd71e24caf4.tar.xz
pinctrl: bcm2835: move existing code from gpio.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'drivers/pinctrl')
-rw-r--r--drivers/pinctrl/Kconfig6
-rw-r--r--drivers/pinctrl/Makefile1
-rw-r--r--drivers/pinctrl/pinctrl-bcm2835.c162
3 files changed, 169 insertions, 0 deletions
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index de83c124a1..45c3b351d6 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -17,6 +17,12 @@ config PINCTRL_AT91
help
The pinmux controller found on AT91 SoCs.
+config PINCTRL_BCM283X
+ bool "GPIO and pinmux support for BCM283X"
+ depends on ARCH_BCM283X
+ help
+ The pinmux controller on BCM2835
+
config PINCTRL_IMX_IOMUX_V1
bool
help
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index 9450dbbdf5..35b2d4707c 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -1,5 +1,6 @@
obj-$(CONFIG_PINCTRL) += pinctrl.o
obj-$(CONFIG_PINCTRL_AT91) += pinctrl-at91.o
+obj-$(CONFIG_PINCTRL_BCM283X) += pinctrl-bcm2835.o
obj-$(CONFIG_PINCTRL_IMX_IOMUX_V1) += imx-iomux-v1.o
obj-$(CONFIG_PINCTRL_IMX_IOMUX_V2) += imx-iomux-v2.o
obj-$(CONFIG_PINCTRL_IMX_IOMUX_V3) += imx-iomux-v3.o
diff --git a/drivers/pinctrl/pinctrl-bcm2835.c b/drivers/pinctrl/pinctrl-bcm2835.c
new file mode 100644
index 0000000000..1802ab7ccb
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-bcm2835.c
@@ -0,0 +1,162 @@
+/*
+ * Author: Carlo Caione <carlo@carlocaione.org>
+ *
+ * Based on linux/arch/arm/mach-bcm2708/bcm2708_gpio.c
+ *
+ * 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 <errno.h>
+#include <malloc.h>
+#include <io.h>
+#include <gpio.h>
+#include <init.h>
+
+#define GPIOFSEL(x) (0x00+(x)*4)
+#define GPIOSET(x) (0x1c+(x)*4)
+#define GPIOCLR(x) (0x28+(x)*4)
+#define GPIOLEV(x) (0x34+(x)*4)
+#define GPIOEDS(x) (0x40+(x)*4)
+#define GPIOREN(x) (0x4c+(x)*4)
+#define GPIOFEN(x) (0x58+(x)*4)
+#define GPIOHEN(x) (0x64+(x)*4)
+#define GPIOLEN(x) (0x70+(x)*4)
+#define GPIOAREN(x) (0x7c+(x)*4)
+#define GPIOAFEN(x) (0x88+(x)*4)
+#define GPIOUD(x) (0x94+(x)*4)
+#define GPIOUDCLK(x) (0x98+(x)*4)
+
+enum {
+ GPIO_FSEL_INPUT, GPIO_FSEL_OUTPUT,
+ GPIO_FSEL_ALT5, GPIO_FSEL_ALT_4,
+ GPIO_FSEL_ALT0, GPIO_FSEL_ALT1,
+ GPIO_FSEL_ALT2, GPIO_FSEL_ALT3,
+};
+
+struct bcm2835_gpio_chip {
+ void __iomem *base;
+ struct gpio_chip chip;
+};
+
+static int bcm2835_set_function(struct gpio_chip *chip, unsigned gpio, int function)
+{
+ struct bcm2835_gpio_chip *bcmgpio = container_of(chip, struct bcm2835_gpio_chip, chip);
+ void __iomem *base = bcmgpio->base;
+ unsigned gpiodir;
+ unsigned gpio_bank = gpio / 10;
+ unsigned gpio_field_offset = (gpio - 10 * gpio_bank) * 3;
+
+ gpiodir = readl(base + GPIOFSEL(gpio_bank));
+ gpiodir &= ~(7 << gpio_field_offset);
+ gpiodir |= function << gpio_field_offset;
+ writel(gpiodir, base + GPIOFSEL(gpio_bank));
+ gpiodir = readl(base + GPIOFSEL(gpio_bank));
+
+ return 0;
+}
+
+static void bcm2835_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value)
+{
+ struct bcm2835_gpio_chip *bcmgpio = container_of(chip, struct bcm2835_gpio_chip, chip);
+ void __iomem *base = bcmgpio->base;
+ unsigned gpio_bank = gpio / 32;
+ unsigned gpio_field_offset = gpio % 32;
+
+ if (value)
+ writel(1 << gpio_field_offset, base + GPIOSET(gpio_bank));
+ else
+ writel(1 << gpio_field_offset, base + GPIOCLR(gpio_bank));
+}
+
+static int bcm2835_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
+{
+ struct bcm2835_gpio_chip *bcmgpio = container_of(chip, struct bcm2835_gpio_chip, chip);
+ void __iomem *base = bcmgpio->base;
+ unsigned gpio_bank = gpio / 32;
+ unsigned gpio_field_offset = gpio % 32;
+ unsigned lev;
+
+ lev = readl(base + GPIOLEV(gpio_bank));
+ return 0x1 & (lev >> gpio_field_offset);
+}
+
+static int bcm2835_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
+{
+ return bcm2835_set_function(chip, gpio, GPIO_FSEL_INPUT);
+}
+
+static int bcm2835_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, int value)
+{
+ bcm2835_set_function(chip, gpio, GPIO_FSEL_OUTPUT);
+ bcm2835_gpio_set_value(chip, gpio, value);
+
+ return 0;
+}
+
+static struct gpio_ops bcm2835_gpio_ops = {
+ .direction_input = bcm2835_gpio_direction_input,
+ .direction_output = bcm2835_gpio_direction_output,
+ .get = bcm2835_gpio_get_value,
+ .set = bcm2835_gpio_set_value,
+};
+
+static int bcm2835_gpio_probe(struct device_d *dev)
+{
+ struct resource *iores;
+ struct bcm2835_gpio_chip *bcmgpio;
+ int ret;
+
+ bcmgpio = xzalloc(sizeof(*bcmgpio));
+ iores = dev_request_mem_resource(dev, 0);
+ if (IS_ERR(iores))
+ return PTR_ERR(iores);
+ bcmgpio->base = IOMEM(iores->start);
+ bcmgpio->chip.ops = &bcm2835_gpio_ops;
+ bcmgpio->chip.base = 0;
+ bcmgpio->chip.ngpio = 54;
+ bcmgpio->chip.dev = dev;
+
+ ret = gpiochip_add(&bcmgpio->chip);
+ if (ret) {
+ dev_err(dev, "couldn't add gpiochip, ret = %d\n", ret);
+ goto err;
+ }
+ dev_info(dev, "probed gpiochip%d with base %d\n", dev->id, bcmgpio->chip.base);
+
+ return 0;
+
+err:
+ kfree(bcmgpio);
+
+ return ret;
+}
+
+static __maybe_unused struct of_device_id bcm2835_gpio_dt_ids[] = {
+ {
+ .compatible = "brcm,bcm2835-gpio",
+ }, {
+ /* sentinel */
+ }
+};
+
+static struct driver_d bcm2835_gpio_driver = {
+ .name = "bcm2835-gpio",
+ .probe = bcm2835_gpio_probe,
+ .of_compatible = DRV_OF_COMPAT(bcm2835_gpio_dt_ids),
+};
+
+static int bcm2835_gpio_add(void)
+{
+ return platform_driver_register(&bcm2835_gpio_driver);
+}
+coredevice_initcall(bcm2835_gpio_add);