// SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org> * Copyright (C) 2007 Eugene Konev <ejka@openwrt.org> * Copyright (C) 2009-2010 Florian Fainelli <florian@openwrt.org> */ #include <linux/init.h> #include <linux/export.h> #include <linux/gpio.h> #include <asm/mach-ar7/ar7.h> #define AR7_GPIO_MAX 32 #define TITAN_GPIO_MAX 51 struct ar7_gpio_chip { void __iomem *regs; struct gpio_chip chip; }; static int ar7_gpio_get_value(struct gpio_chip *chip, unsigned gpio) { struct ar7_gpio_chip *gpch = gpiochip_get_data(chip); void __iomem *gpio_in = gpch->regs + AR7_GPIO_INPUT; return !!(readl(gpio_in) & (1 << gpio)); } static int titan_gpio_get_value(struct gpio_chip *chip, unsigned gpio) { struct ar7_gpio_chip *gpch = gpiochip_get_data(chip); void __iomem *gpio_in0 = gpch->regs + TITAN_GPIO_INPUT_0; void __iomem *gpio_in1 = gpch->regs + TITAN_GPIO_INPUT_1; return readl(gpio >> 5 ? gpio_in1 : gpio_in0) & (1 << (gpio & 0x1f)); } static void ar7_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value) { struct ar7_gpio_chip *gpch = gpiochip_get_data(chip); void __iomem *gpio_out = gpch->regs + AR7_GPIO_OUTPUT; unsigned tmp; tmp = readl(gpio_out) & ~(1 << gpio); if (value) tmp |= 1 << gpio; writel(tmp, gpio_out); } static void titan_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value) { struct ar7_gpio_chip *gpch = gpiochip_get_data(chip); void __iomem *gpio_out0 = gpch->regs + TITAN_GPIO_OUTPUT_0; void __iomem *gpio_out1 = gpch->regs + TITAN_GPIO_OUTPUT_1; unsigned tmp; tmp = readl(gpio >> 5 ? gpio_out1 : gpio_out0) & ~(1 << (gpio & 0x1f)); if (value) tmp |= 1 << (gpio & 0x1f); writel(tmp, gpio >> 5 ? gpio_out1 : gpio_out0); } static int ar7_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) { struct ar7_gpio_chip *gpch = gpiochip_get_data(chip); void __iomem *gpio_dir = gpch->regs + AR7_GPIO_DIR; writel(readl(gpio_dir) | (1 << gpio), gpio_dir); return 0; } static int titan_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) { struct ar7_gpio_chip *gpch = gpiochip_get_data(chip); void __iomem *gpio_dir0 = gpch->regs + TITAN_GPIO_DIR_0; void __iomem *gpio_dir1 = gpch->regs + TITAN_GPIO_DIR_1; if (gpio >= TITAN_GPIO_MAX) return -EINVAL; writel(readl(gpio >> 5 ? gpio_dir1 : gpio_dir0) | (1 << (gpio & 0x1f)), gpio >> 5 ? gpio_dir1 : gpio_dir0); return 0; } static int ar7_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, int value) { struct ar7_gpio_chip *gpch = gpiochip_get_data(chip); void __iomem *gpio_dir = gpch->regs + AR7_GPIO_DIR; ar7_gpio_set_value(chip, gpio, value); writel(readl(gpio_dir) & ~(1 << gpio), gpio_dir); return 0; } static int titan_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, int value) { struct ar7_gpio_chip *gpch = gpiochip_get_data(chip); void __iomem *gpio_dir0 = gpch->regs + TITAN_GPIO_DIR_0; void __iomem *gpio_dir1 = gpch->regs + TITAN_GPIO_DIR_1; if (gpio >= TITAN_GPIO_MAX) return -EINVAL; titan_gpio_set_value(chip, gpio, value); writel(readl(gpio >> 5 ? gpio_dir1 : gpio_dir0) & ~(1 << (gpio & 0x1f)), gpio >> 5 ? gpio_dir1 : gpio_dir0); return 0; } static struct ar7_gpio_chip ar7_gpio_chip = { .chip = { .label = "ar7-gpio", .direction_input = ar7_gpio_direction_input, .direction_output = ar7_gpio_direction_output, .set = ar7_gpio_set_value, .get = ar7_gpio_get_value, .base = 0, .ngpio = AR7_GPIO_MAX, } }; static struct ar7_gpio_chip titan_gpio_chip = { .chip = { .label = "titan-gpio", .direction_input = titan_gpio_direction_input, .direction_output = titan_gpio_direction_output, .set = titan_gpio_set_value, .get = titan_gpio_get_value, .base = 0, .ngpio = TITAN_GPIO_MAX, } }; static inline int ar7_gpio_enable_ar7(unsigned gpio) { void __iomem *gpio_en = ar7_gpio_chip.regs + AR7_GPIO_ENABLE; writel(readl(gpio_en) | (1 << gpio), gpio_en); return 0; } static inline int ar7_gpio_enable_titan(unsigned gpio) { void __iomem *gpio_en0 = titan_gpio_chip.regs + TITAN_GPIO_ENBL_0; void __iomem *gpio_en1 = titan_gpio_chip.regs + TITAN_GPIO_ENBL_1; writel(readl(gpio >> 5 ? gpio_en1 : gpio_en0) | (1 << (gpio & 0x1f)), gpio >> 5 ? gpio_en1 : gpio_en0); return 0; } int ar7_gpio_enable(unsigned gpio) { return ar7_is_titan() ? ar7_gpio_enable_titan(gpio) : ar7_gpio_enable_ar7(gpio); } EXPORT_SYMBOL(ar7_gpio_enable); static inline int ar7_gpio_disable_ar7(unsigned gpio) { void __iomem *gpio_en = ar7_gpio_chip.regs + AR7_GPIO_ENABLE; writel(readl(gpio_en) & ~(1 << gpio), gpio_en); return 0; } static inline int ar7_gpio_disable_titan(unsigned gpio) { void __iomem *gpio_en0 = titan_gpio_chip.regs + TITAN_GPIO_ENBL_0; void __iomem *gpio_en1 = titan_gpio_chip.regs + TITAN_GPIO_ENBL_1; writel(readl(gpio >> 5 ? gpio_en1 : gpio_en0) & ~(1 << (gpio & 0x1f)), gpio >> 5 ? gpio_en1 : gpio_en0); return 0; } int ar7_gpio_disable(unsigned gpio) { return ar7_is_titan() ? ar7_gpio_disable_titan(gpio) : ar7_gpio_disable_ar7(gpio); } EXPORT_SYMBOL(ar7_gpio_disable); struct titan_gpio_cfg { u32 reg; u32 shift; u32 func; }; static const struct titan_gpio_cfg titan_gpio_table[] = { /* reg, start bit, mux value */ {4, 24, 1}, {4, 26, 1}, {4, 28, 1}, {4, 30, 1}, {5, 6, 1}, {5, 8, 1}, {5, 10, 1}, {5, 12, 1}, {7, 14, 3}, {7, 16, 3}, {7, 18, 3}, {7, 20, 3}, {7, 22, 3}, {7, 26, 3}, {7, 28, 3}, {7, 30, 3}, {8, 0, 3}, {8, 2, 3}, {8, 4, 3}, {8, 10, 3}, {8, 14, 3}, {8, 16, 3}, {8, 18, 3}, {8, 20, 3}, {9, 8, 3}, {9, 10, 3}, {9, 12, 3}, {9, 14, 3}, {9, 18, 3}, {9, 20, 3}, {9, 24, 3}, {9, 26, 3}, {9, 28, 3}, {9, 30, 3}, {10, 0, 3}, {10, 2, 3}, {10, 8, 3}, {10, 10, 3}, {10, 12, 3}, {10, 14, 3}, {13, 12, 3}, {13, 14, 3}, {13, 16, 3}, {13, 18, 3}, {13, 24, 3}, {13, 26, 3}, {13, 28, 3}, {13, 30, 3}, {14, 2, 3}, {14, 6, 3}, {14, 8, 3}, {14, 12, 3} }; static int titan_gpio_pinsel(unsigned gpio) { struct titan_gpio_cfg gpio_cfg; u32 mux_status, pin_sel_reg, tmp; void __iomem *pin_sel = (void __iomem *)KSEG1ADDR(AR7_REGS_PINSEL); if (gpio >= ARRAY_SIZE(titan_gpio_table)) return -EINVAL; gpio_cfg = titan_gpio_table[gpio]; pin_sel_reg = gpio_cfg.reg - 1; mux_status = (readl(pin_sel + pin_sel_reg) >> gpio_cfg.shift) & 0x3; /* Check the mux status */ if (!((mux_status == 0) || (mux_status == gpio_cfg.func))) return 0; /* Set the pin sel value */ tmp = readl(pin_sel + pin_sel_reg); tmp |= ((gpio_cfg.func & 0x3) << gpio_cfg.shift); writel(tmp, pin_sel + pin_sel_reg); return 0; } /* Perform minimal Titan GPIO configuration */ static void titan_gpio_init(void) { unsigned i; for (i = 44; i < 48; i++) { titan_gpio_pinsel(i); ar7_gpio_enable_titan(i); titan_gpio_direction_input(&titan_gpio_chip.chip, i); } } int __init ar7_gpio_init(void) { int ret; struct ar7_gpio_chip *gpch; unsigned size; if (!ar7_is_titan()) { gpch = &ar7_gpio_chip; size = 0x10; } else { gpch = &titan_gpio_chip; size = 0x1f; } gpch->regs = ioremap(AR7_REGS_GPIO, size); if (!gpch->regs) { printk(KERN_ERR "%s: failed to ioremap regs\n", gpch->chip.label); return -ENOMEM; } ret = gpiochip_add_data(&gpch->chip, gpch); if (ret) { printk(KERN_ERR "%s: failed to add gpiochip\n", gpch->chip.label); return ret; } printk(KERN_INFO "%s: registered %d GPIOs\n", gpch->chip.label, gpch->chip.ngpio); if (ar7_is_titan()) titan_gpio_init(); return ret; }