diff options
| -rw-r--r-- | drivers/gpio/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/gpio/Makefile | 2 | ||||
| -rw-r--r-- | drivers/gpio/pic32_gpio.c | 174 |
3 files changed, 182 insertions, 1 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index e60e9fd86c..845dc725c5 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -83,4 +83,11 @@ config VYBRID_GPIO help Say yes here to support Vybrid vf610 GPIOs. +config PIC32_GPIO + bool "Microchip PIC32 GPIO driver" + depends on DM_GPIO && MACH_PIC32 + default y + help + Say yes here to support Microchip PIC32 GPIOs. + endmenu diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index fb4fd255df..845a6d4493 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -46,4 +46,4 @@ obj-$(CONFIG_STM32_GPIO) += stm32_gpio.o obj-$(CONFIG_ZYNQ_GPIO) += zynq_gpio.o obj-$(CONFIG_VYBRID_GPIO) += vybrid_gpio.o obj-$(CONFIG_HIKEY_GPIO) += hi6220_gpio.o - +obj-$(CONFIG_PIC32_GPIO) += pic32_gpio.o diff --git a/drivers/gpio/pic32_gpio.c b/drivers/gpio/pic32_gpio.c new file mode 100644 index 0000000000..499b4fa5ad --- /dev/null +++ b/drivers/gpio/pic32_gpio.c @@ -0,0 +1,174 @@ +/* + * Copyright (c) 2015 Microchip Technology Inc + * Purna Chandra Mandal <purna.mandal@microchip.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <dm.h> +#include <errno.h> +#include <malloc.h> +#include <asm/io.h> +#include <asm/gpio.h> +#include <linux/compat.h> +#include <dt-bindings/gpio/gpio.h> +#include <mach/pic32.h> + +DECLARE_GLOBAL_DATA_PTR; + +/* Peripheral Pin Control */ +struct pic32_reg_port { + struct pic32_reg_atomic ansel; + struct pic32_reg_atomic tris; + struct pic32_reg_atomic port; + struct pic32_reg_atomic lat; + struct pic32_reg_atomic open_drain; + struct pic32_reg_atomic cnpu; + struct pic32_reg_atomic cnpd; + struct pic32_reg_atomic cncon; +}; + +enum { + MICROCHIP_GPIO_DIR_OUT, + MICROCHIP_GPIO_DIR_IN, + MICROCHIP_GPIOS_PER_BANK = 16, +}; + +struct pic32_gpio_priv { + struct pic32_reg_port *regs; + char name[2]; +}; + +static int pic32_gpio_get_value(struct udevice *dev, unsigned offset) +{ + struct pic32_gpio_priv *priv = dev_get_priv(dev); + + return !!(readl(&priv->regs->port.raw) & BIT(offset)); +} + +static int pic32_gpio_set_value(struct udevice *dev, unsigned offset, + int value) +{ + struct pic32_gpio_priv *priv = dev_get_priv(dev); + int mask = BIT(offset); + + if (value) + writel(mask, &priv->regs->port.set); + else + writel(mask, &priv->regs->port.clr); + + return 0; +} + +static int pic32_gpio_direction(struct udevice *dev, unsigned offset) +{ + struct pic32_gpio_priv *priv = dev_get_priv(dev); + + /* pin in analog mode ? */ + if (readl(&priv->regs->ansel.raw) & BIT(offset)) + return -EPERM; + + if (readl(&priv->regs->tris.raw) & BIT(offset)) + return MICROCHIP_GPIO_DIR_IN; + else + return MICROCHIP_GPIO_DIR_OUT; +} + +static int pic32_gpio_direction_input(struct udevice *dev, unsigned offset) +{ + struct pic32_gpio_priv *priv = dev_get_priv(dev); + int mask = BIT(offset); + + writel(mask, &priv->regs->ansel.clr); + writel(mask, &priv->regs->tris.set); + + return 0; +} + +static int pic32_gpio_direction_output(struct udevice *dev, + unsigned offset, int value) +{ + struct pic32_gpio_priv *priv = dev_get_priv(dev); + int mask = BIT(offset); + + writel(mask, &priv->regs->ansel.clr); + writel(mask, &priv->regs->tris.clr); + + pic32_gpio_set_value(dev, offset, value); + return 0; +} + +static int pic32_gpio_xlate(struct udevice *dev, struct gpio_desc *desc, + struct fdtdec_phandle_args *args) +{ + desc->flags = args->args[1] & GPIO_ACTIVE_LOW ? GPIOD_ACTIVE_LOW : 0; + + return 0; +} + +static int pic32_gpio_get_function(struct udevice *dev, unsigned offset) +{ + int ret = GPIOF_UNUSED; + + switch (pic32_gpio_direction(dev, offset)) { + case MICROCHIP_GPIO_DIR_OUT: + ret = GPIOF_OUTPUT; + break; + case MICROCHIP_GPIO_DIR_IN: + ret = GPIOF_INPUT; + break; + default: + ret = GPIOF_UNUSED; + break; + } + return ret; +} + +static const struct dm_gpio_ops gpio_pic32_ops = { + .direction_input = pic32_gpio_direction_input, + .direction_output = pic32_gpio_direction_output, + .get_value = pic32_gpio_get_value, + .set_value = pic32_gpio_set_value, + .get_function = pic32_gpio_get_function, + .xlate = pic32_gpio_xlate, +}; + +static int pic32_gpio_probe(struct udevice *dev) +{ + struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev); + struct pic32_gpio_priv *priv = dev_get_priv(dev); + fdt_addr_t addr; + fdt_size_t size; + char *end; + int bank; + + addr = fdtdec_get_addr_size(gd->fdt_blob, dev->of_offset, "reg", &size); + if (addr == FDT_ADDR_T_NONE) + return -EINVAL; + + priv->regs = ioremap(addr, size); + + uc_priv->gpio_count = MICROCHIP_GPIOS_PER_BANK; + /* extract bank name */ + end = strrchr(dev->name, '@'); + bank = trailing_strtoln(dev->name, end); + priv->name[0] = 'A' + bank; + uc_priv->bank_name = priv->name; + + return 0; +} + +static const struct udevice_id pic32_gpio_ids[] = { + { .compatible = "microchip,pic32mzda-gpio" }, + { } +}; + +U_BOOT_DRIVER(gpio_pic32) = { + .name = "gpio_pic32", + .id = UCLASS_GPIO, + .of_match = pic32_gpio_ids, + .ops = &gpio_pic32_ops, + .probe = pic32_gpio_probe, + .priv_auto_alloc_size = sizeof(struct pic32_gpio_priv), +}; |