From be717102c8ba2d0ea0225e9fe0590fd71e24caf4 Mon Sep 17 00:00:00 2001 From: Tomaz Solc Date: Mon, 18 Feb 2019 12:32:15 +0100 Subject: pinctrl: bcm2835: move existing code from gpio. Signed-off-by: Sascha Hauer --- drivers/pinctrl/Kconfig | 6 ++ drivers/pinctrl/Makefile | 1 + drivers/pinctrl/pinctrl-bcm2835.c | 162 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 169 insertions(+) create mode 100644 drivers/pinctrl/pinctrl-bcm2835.c (limited to 'drivers/pinctrl') 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 + * + * 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 +#include +#include +#include +#include +#include + +#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); -- cgit v1.2.3