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author | Julien Grossholtz <julien.grossholtz@savoirfairelinux.com> | 2016-01-13 11:57:43 -0500 |
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committer | Linus Walleij <linus.walleij@linaro.org> | 2016-02-05 15:11:08 +0100 |
commit | 5041e791440a53930f06ce22deeb17a72e343ad0 (patch) | |
tree | e527a33975afb4cc772ce8b8c85ac7ef80903037 /drivers/gpio | |
parent | 9cd56ab89987f993a2774fe1793385bd23a7487c (diff) | |
download | linux-stable-5041e791440a53930f06ce22deeb17a72e343ad0.tar.gz linux-stable-5041e791440a53930f06ce22deeb17a72e343ad0.tar.bz2 linux-stable-5041e791440a53930f06ce22deeb17a72e343ad0.zip |
gpio: add TS-4800 fpga GPIO support
The TS-4800 GPIO driver provide support for the GPIOs available
on the Technologic Sytems board FPGA. It allows to set
direction and read/write states.
It uses the generic gpio driver.
Signed-off-by: Julien Grossholtz <julien.grossholtz@savoirfairelinux.com>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio')
-rw-r--r-- | drivers/gpio/Kconfig | 7 | ||||
-rw-r--r-- | drivers/gpio/Makefile | 1 | ||||
-rw-r--r-- | drivers/gpio/gpio-ts4800.c | 94 |
3 files changed, 102 insertions, 0 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 00f17673e7e0..77df86635480 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -382,6 +382,13 @@ config GPIO_TB10X select GENERIC_IRQ_CHIP select OF_GPIO +config GPIO_TS4800 + tristate "TS-4800 DIO blocks and compatibles" + depends on OF_GPIO + select GPIO_GENERIC + help + This driver support TS-4800 FPGA GPIO controllers. + config GPIO_TZ1090 bool "Toumaz Xenif TZ1090 GPIO support" depends on SOC_TZ1090 diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index d4cc4f3d3674..2f5852daab0d 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -99,6 +99,7 @@ obj-$(CONFIG_GPIO_PALMAS) += gpio-palmas.o obj-$(CONFIG_GPIO_TPS6586X) += gpio-tps6586x.o obj-$(CONFIG_GPIO_TPS65910) += gpio-tps65910.o obj-$(CONFIG_GPIO_TPS65912) += gpio-tps65912.o +obj-$(CONFIG_GPIO_TS4800) += gpio-ts4800.o obj-$(CONFIG_GPIO_TS5500) += gpio-ts5500.o obj-$(CONFIG_GPIO_TWL4030) += gpio-twl4030.o obj-$(CONFIG_GPIO_TWL6040) += gpio-twl6040.o diff --git a/drivers/gpio/gpio-ts4800.c b/drivers/gpio/gpio-ts4800.c new file mode 100644 index 000000000000..c4908a45c523 --- /dev/null +++ b/drivers/gpio/gpio-ts4800.c @@ -0,0 +1,94 @@ +/* + * GPIO driver for the TS-4800 board + * + * Copyright (c) 2016 - Savoir-faire Linux + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#include <linux/gpio/driver.h> +#include <linux/of_address.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> + +#define DEFAULT_PIN_NUMBER 16 +#define INPUT_REG_OFFSET 0x00 +#define OUTPUT_REG_OFFSET 0x02 +#define DIRECTION_REG_OFFSET 0x04 + +static int ts4800_gpio_probe(struct platform_device *pdev) +{ + struct device_node *node; + struct gpio_chip *chip; + struct resource *res; + void __iomem *base_addr; + int retval; + u32 ngpios; + + chip = devm_kzalloc(&pdev->dev, sizeof(struct gpio_chip), GFP_KERNEL); + if (!chip) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + base_addr = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(base_addr)) + return PTR_ERR(base_addr); + + node = pdev->dev.of_node; + if (!node) + return -EINVAL; + + retval = of_property_read_u32(node, "ngpios", &ngpios); + if (retval == -EINVAL) + ngpios = DEFAULT_PIN_NUMBER; + else if (retval) + return retval; + + retval = bgpio_init(chip, &pdev->dev, 2, base_addr + INPUT_REG_OFFSET, + base_addr + OUTPUT_REG_OFFSET, NULL, + base_addr + DIRECTION_REG_OFFSET, NULL, + BGPIOF_BIG_ENDIAN & BGPIOF_BIG_ENDIAN_BYTE_ORDER); + if (retval) { + dev_err(&pdev->dev, "bgpio_init failed\n"); + return retval; + } + + chip->base = -1; + chip->label = dev_name(&pdev->dev); + chip->ngpio = ngpios; + + platform_set_drvdata(pdev, chip); + + return gpiochip_add_data(chip, NULL); +} + +static int ts4800_gpio_remove(struct platform_device *pdev) +{ + struct gpio_chip *chip = platform_get_drvdata(pdev); + + gpiochip_remove(chip); + + return 0; +} + +static const struct of_device_id ts4800_gpio_of_match[] = { + { .compatible = "technologic,ts4800-gpio", }, + {}, +}; + +static struct platform_driver ts4800_gpio_driver = { + .driver = { + .name = "ts4800-gpio", + .of_match_table = ts4800_gpio_of_match, + }, + .probe = ts4800_gpio_probe, + .remove = ts4800_gpio_remove, +}; + +module_platform_driver_probe(ts4800_gpio_driver, ts4800_gpio_probe); + +MODULE_AUTHOR("Julien Grossholtz <julien.grossholtz@savoirfairelinux.com>"); +MODULE_DESCRIPTION("TS4800 FPGA GPIO driver"); +MODULE_LICENSE("GPL v2"); |