This driver is based on linux/arch/mips/bcm63xx/gpio.c, simplified to allow defining one or two independent banks for each Broadcom SoC.
Signed-off-by: Álvaro Fernández Rojas noltari@gmail.com Reviewed-by: Simon Glass sjg@chromium.org --- v2: Introduce changes suggested by Simon Glass: - Remove unneeded strdup.
drivers/gpio/Kconfig | 6 +++ drivers/gpio/Makefile | 1 + drivers/gpio/bcm6345_gpio.c | 125 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 132 insertions(+) create mode 100644 drivers/gpio/bcm6345_gpio.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index c95e9ac..9f04061 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -21,6 +21,12 @@ config ALTERA_PIO Select this to enable PIO for Altera devices. Please find details on the "Embedded Peripherals IP User Guide" of Altera.
+config BCM6345_GPIO + bool "BCM6345 GPIO driver" + depends on DM_GPIO && ARCH_BMIPS + help + This driver supports the GPIO banks on BCM6345 SoCs. + config DWAPB_GPIO bool "DWAPB GPIO driver" depends on DM && DM_GPIO diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 27f8068..0484428 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -16,6 +16,7 @@ obj-$(CONFIG_DM_74X164) += 74x164_gpio.o
obj-$(CONFIG_AT91_GPIO) += at91_gpio.o obj-$(CONFIG_ATMEL_PIO4) += atmel_pio4.o +obj-$(CONFIG_BCM6345_GPIO) += bcm6345_gpio.o obj-$(CONFIG_INTEL_ICH6_GPIO) += intel_ich6_gpio.o obj-$(CONFIG_INTEL_BROADWELL_GPIO) += intel_broadwell_gpio.o obj-$(CONFIG_KIRKWOOD_GPIO) += kw_gpio.o diff --git a/drivers/gpio/bcm6345_gpio.c b/drivers/gpio/bcm6345_gpio.c new file mode 100644 index 0000000..1c46020 --- /dev/null +++ b/drivers/gpio/bcm6345_gpio.c @@ -0,0 +1,125 @@ +/* + * Copyright (C) 2017 Álvaro Fernández Rojas noltari@gmail.com + * + * Derived from linux/arch/mips/bcm63xx/gpio.c: + * Copyright (C) 2008 Maxime Bizon mbizon@freebox.fr + * Copyright (C) 2008-2011 Florian Fainelli florian@openwrt.org + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <errno.h> +#include <asm/gpio.h> +#include <asm/io.h> +#include <dm/device.h> + +DECLARE_GLOBAL_DATA_PTR; + +struct bcm6345_gpio_priv { + void __iomem *reg_dirout; + void __iomem *reg_data; +}; + +static int bcm6345_gpio_get_value(struct udevice *dev, unsigned offset) +{ + struct bcm6345_gpio_priv *priv = dev_get_priv(dev); + + return !!(readl_be(priv->reg_data) & BIT(offset)); +} + +static int bcm6345_gpio_set_value(struct udevice *dev, unsigned offset, + int value) +{ + struct bcm6345_gpio_priv *priv = dev_get_priv(dev); + + if (value) + setbits_be32(priv->reg_data, BIT(offset)); + else + clrbits_be32(priv->reg_data, BIT(offset)); + + return 0; +} + +static int bcm6345_gpio_set_direction(void __iomem *dirout, unsigned offset, + bool input) +{ + if (input) + clrbits_be32(dirout, BIT(offset)); + else + setbits_be32(dirout, BIT(offset)); + + return 0; +} + +static int bcm6345_gpio_direction_input(struct udevice *dev, unsigned offset) +{ + struct bcm6345_gpio_priv *priv = dev_get_priv(dev); + + return bcm6345_gpio_set_direction(priv->reg_dirout, offset, 1); +} + +static int bcm6345_gpio_direction_output(struct udevice *dev, unsigned offset, + int value) +{ + struct bcm6345_gpio_priv *priv = dev_get_priv(dev); + + return bcm6345_gpio_set_direction(priv->reg_dirout, offset, 0); +} + +static int bcm6345_gpio_get_function(struct udevice *dev, unsigned offset) +{ + struct bcm6345_gpio_priv *priv = dev_get_priv(dev); + + if (readl_be(priv->reg_dirout) & BIT(offset)) + return GPIOF_OUTPUT; + else + return GPIOF_INPUT; +} + +static const struct dm_gpio_ops bcm6345_gpio_ops = { + .direction_input = bcm6345_gpio_direction_input, + .direction_output = bcm6345_gpio_direction_output, + .get_value = bcm6345_gpio_get_value, + .set_value = bcm6345_gpio_set_value, + .get_function = bcm6345_gpio_get_function, +}; + +static int bcm6345_gpio_probe(struct udevice *dev) +{ + struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev); + struct bcm6345_gpio_priv *priv = dev_get_priv(dev); + fdt_addr_t data_addr, dirout_addr; + fdt_size_t data_size, dirout_size; + + dirout_addr = dev_get_addr_size_index(dev, 0, &dirout_size); + if (dirout_addr == FDT_ADDR_T_NONE) + return -EINVAL; + + data_addr = dev_get_addr_size_index(dev, 1, &data_size); + if (data_addr == FDT_ADDR_T_NONE) + return -EINVAL; + + priv->reg_data = ioremap(data_addr, data_size); + priv->reg_dirout = ioremap(dirout_addr, dirout_size); + + uc_priv->gpio_count = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev), + "ngpios", 32); + uc_priv->bank_name = dev->name; + + return 0; +} + +static const struct udevice_id bcm6345_gpio_ids[] = { + { .compatible = "brcm,bcm6345-gpio" }, + { /* sentinel */ } +}; + +U_BOOT_DRIVER(bcm6345_gpio) = { + .name = "bcm6345-gpio", + .id = UCLASS_GPIO, + .of_match = bcm6345_gpio_ids, + .ops = &bcm6345_gpio_ops, + .priv_auto_alloc_size = sizeof(struct bcm6345_gpio_priv), + .probe = bcm6345_gpio_probe, +};