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1// SPDX-License-Identifier: GPL-2.0+2/*3 * Loongson GPIO Support4 *5 * Copyright (C) 2022-2023 Loongson Technology Corporation Limited6 */7 8#include <linux/kernel.h>9#include <linux/init.h>10#include <linux/module.h>11#include <linux/spinlock.h>12#include <linux/err.h>13#include <linux/gpio/driver.h>14#include <linux/platform_device.h>15#include <linux/bitops.h>16#include <asm/types.h>17 18enum loongson_gpio_mode {19 BIT_CTRL_MODE,20 BYTE_CTRL_MODE,21};22 23struct loongson_gpio_chip_data {24 const char *label;25 enum loongson_gpio_mode mode;26 unsigned int conf_offset;27 unsigned int out_offset;28 unsigned int in_offset;29 unsigned int inten_offset;30};31 32struct loongson_gpio_chip {33 struct gpio_chip chip;34 struct fwnode_handle *fwnode;35 spinlock_t lock;36 void __iomem *reg_base;37 const struct loongson_gpio_chip_data *chip_data;38};39 40static inline struct loongson_gpio_chip *to_loongson_gpio_chip(struct gpio_chip *chip)41{42 return container_of(chip, struct loongson_gpio_chip, chip);43}44 45static inline void loongson_commit_direction(struct loongson_gpio_chip *lgpio, unsigned int pin,46 int input)47{48 u8 bval = input ? 1 : 0;49 50 writeb(bval, lgpio->reg_base + lgpio->chip_data->conf_offset + pin);51}52 53static void loongson_commit_level(struct loongson_gpio_chip *lgpio, unsigned int pin, int high)54{55 u8 bval = high ? 1 : 0;56 57 writeb(bval, lgpio->reg_base + lgpio->chip_data->out_offset + pin);58}59 60static int loongson_gpio_direction_input(struct gpio_chip *chip, unsigned int pin)61{62 unsigned long flags;63 struct loongson_gpio_chip *lgpio = to_loongson_gpio_chip(chip);64 65 spin_lock_irqsave(&lgpio->lock, flags);66 loongson_commit_direction(lgpio, pin, 1);67 spin_unlock_irqrestore(&lgpio->lock, flags);68 69 return 0;70}71 72static int loongson_gpio_direction_output(struct gpio_chip *chip, unsigned int pin, int value)73{74 unsigned long flags;75 struct loongson_gpio_chip *lgpio = to_loongson_gpio_chip(chip);76 77 spin_lock_irqsave(&lgpio->lock, flags);78 loongson_commit_level(lgpio, pin, value);79 loongson_commit_direction(lgpio, pin, 0);80 spin_unlock_irqrestore(&lgpio->lock, flags);81 82 return 0;83}84 85static int loongson_gpio_get(struct gpio_chip *chip, unsigned int pin)86{87 u8 bval;88 int val;89 struct loongson_gpio_chip *lgpio = to_loongson_gpio_chip(chip);90 91 bval = readb(lgpio->reg_base + lgpio->chip_data->in_offset + pin);92 val = bval & 1;93 94 return val;95}96 97static int loongson_gpio_get_direction(struct gpio_chip *chip, unsigned int pin)98{99 u8 bval;100 struct loongson_gpio_chip *lgpio = to_loongson_gpio_chip(chip);101 102 bval = readb(lgpio->reg_base + lgpio->chip_data->conf_offset + pin);103 if (bval & 1)104 return GPIO_LINE_DIRECTION_IN;105 106 return GPIO_LINE_DIRECTION_OUT;107}108 109static void loongson_gpio_set(struct gpio_chip *chip, unsigned int pin, int value)110{111 unsigned long flags;112 struct loongson_gpio_chip *lgpio = to_loongson_gpio_chip(chip);113 114 spin_lock_irqsave(&lgpio->lock, flags);115 loongson_commit_level(lgpio, pin, value);116 spin_unlock_irqrestore(&lgpio->lock, flags);117}118 119static int loongson_gpio_to_irq(struct gpio_chip *chip, unsigned int offset)120{121 unsigned int u;122 struct platform_device *pdev = to_platform_device(chip->parent);123 struct loongson_gpio_chip *lgpio = to_loongson_gpio_chip(chip);124 125 if (lgpio->chip_data->mode == BIT_CTRL_MODE) {126 /* Get the register index from offset then multiply by bytes per register */127 u = readl(lgpio->reg_base + lgpio->chip_data->inten_offset + (offset / 32) * 4);128 u |= BIT(offset % 32);129 writel(u, lgpio->reg_base + lgpio->chip_data->inten_offset + (offset / 32) * 4);130 } else {131 writeb(1, lgpio->reg_base + lgpio->chip_data->inten_offset + offset);132 }133 134 return platform_get_irq(pdev, offset);135}136 137static int loongson_gpio_init(struct device *dev, struct loongson_gpio_chip *lgpio,138 void __iomem *reg_base)139{140 int ret;141 u32 ngpios;142 143 lgpio->reg_base = reg_base;144 if (lgpio->chip_data->mode == BIT_CTRL_MODE) {145 ret = bgpio_init(&lgpio->chip, dev, 8,146 lgpio->reg_base + lgpio->chip_data->in_offset,147 lgpio->reg_base + lgpio->chip_data->out_offset,148 NULL, NULL,149 lgpio->reg_base + lgpio->chip_data->conf_offset,150 0);151 if (ret) {152 dev_err(dev, "unable to init generic GPIO\n");153 return ret;154 }155 } else {156 lgpio->chip.direction_input = loongson_gpio_direction_input;157 lgpio->chip.get = loongson_gpio_get;158 lgpio->chip.get_direction = loongson_gpio_get_direction;159 lgpio->chip.direction_output = loongson_gpio_direction_output;160 lgpio->chip.set = loongson_gpio_set;161 lgpio->chip.parent = dev;162 device_property_read_u32(dev, "ngpios", &ngpios);163 lgpio->chip.ngpio = ngpios;164 spin_lock_init(&lgpio->lock);165 }166 167 lgpio->chip.label = lgpio->chip_data->label;168 lgpio->chip.can_sleep = false;169 if (lgpio->chip_data->inten_offset)170 lgpio->chip.to_irq = loongson_gpio_to_irq;171 172 return devm_gpiochip_add_data(dev, &lgpio->chip, lgpio);173}174 175static int loongson_gpio_probe(struct platform_device *pdev)176{177 void __iomem *reg_base;178 struct loongson_gpio_chip *lgpio;179 struct device *dev = &pdev->dev;180 181 lgpio = devm_kzalloc(dev, sizeof(*lgpio), GFP_KERNEL);182 if (!lgpio)183 return -ENOMEM;184 185 lgpio->chip_data = device_get_match_data(dev);186 187 reg_base = devm_platform_ioremap_resource(pdev, 0);188 if (IS_ERR(reg_base))189 return PTR_ERR(reg_base);190 191 return loongson_gpio_init(dev, lgpio, reg_base);192}193 194static const struct loongson_gpio_chip_data loongson_gpio_ls2k_data = {195 .label = "ls2k_gpio",196 .mode = BIT_CTRL_MODE,197 .conf_offset = 0x0,198 .in_offset = 0x20,199 .out_offset = 0x10,200 .inten_offset = 0x30,201};202 203static const struct loongson_gpio_chip_data loongson_gpio_ls2k0500_data0 = {204 .label = "ls2k0500_gpio",205 .mode = BIT_CTRL_MODE,206 .conf_offset = 0x0,207 .in_offset = 0x8,208 .out_offset = 0x10,209 .inten_offset = 0xb0,210};211 212static const struct loongson_gpio_chip_data loongson_gpio_ls2k0500_data1 = {213 .label = "ls2k0500_gpio",214 .mode = BIT_CTRL_MODE,215 .conf_offset = 0x0,216 .in_offset = 0x8,217 .out_offset = 0x10,218 .inten_offset = 0x98,219};220 221static const struct loongson_gpio_chip_data loongson_gpio_ls2k2000_data0 = {222 .label = "ls2k2000_gpio",223 .mode = BIT_CTRL_MODE,224 .conf_offset = 0x0,225 .in_offset = 0xc,226 .out_offset = 0x8,227};228 229static const struct loongson_gpio_chip_data loongson_gpio_ls2k2000_data1 = {230 .label = "ls2k2000_gpio",231 .mode = BIT_CTRL_MODE,232 .conf_offset = 0x0,233 .in_offset = 0x20,234 .out_offset = 0x10,235};236 237static const struct loongson_gpio_chip_data loongson_gpio_ls2k2000_data2 = {238 .label = "ls2k2000_gpio",239 .mode = BIT_CTRL_MODE,240 .conf_offset = 0x84,241 .in_offset = 0x88,242 .out_offset = 0x80,243};244 245static const struct loongson_gpio_chip_data loongson_gpio_ls3a5000_data = {246 .label = "ls3a5000_gpio",247 .mode = BIT_CTRL_MODE,248 .conf_offset = 0x0,249 .in_offset = 0xc,250 .out_offset = 0x8,251};252 253static const struct loongson_gpio_chip_data loongson_gpio_ls7a_data = {254 .label = "ls7a_gpio",255 .mode = BYTE_CTRL_MODE,256 .conf_offset = 0x800,257 .in_offset = 0xa00,258 .out_offset = 0x900,259};260 261static const struct of_device_id loongson_gpio_of_match[] = {262 {263 .compatible = "loongson,ls2k-gpio",264 .data = &loongson_gpio_ls2k_data,265 },266 {267 .compatible = "loongson,ls2k0500-gpio0",268 .data = &loongson_gpio_ls2k0500_data0,269 },270 {271 .compatible = "loongson,ls2k0500-gpio1",272 .data = &loongson_gpio_ls2k0500_data1,273 },274 {275 .compatible = "loongson,ls2k2000-gpio0",276 .data = &loongson_gpio_ls2k2000_data0,277 },278 {279 .compatible = "loongson,ls2k2000-gpio1",280 .data = &loongson_gpio_ls2k2000_data1,281 },282 {283 .compatible = "loongson,ls2k2000-gpio2",284 .data = &loongson_gpio_ls2k2000_data2,285 },286 {287 .compatible = "loongson,ls3a5000-gpio",288 .data = &loongson_gpio_ls3a5000_data,289 },290 {291 .compatible = "loongson,ls7a-gpio",292 .data = &loongson_gpio_ls7a_data,293 },294 {}295};296MODULE_DEVICE_TABLE(of, loongson_gpio_of_match);297 298static const struct acpi_device_id loongson_gpio_acpi_match[] = {299 {300 .id = "LOON0002",301 .driver_data = (kernel_ulong_t)&loongson_gpio_ls7a_data,302 },303 {304 .id = "LOON0007",305 .driver_data = (kernel_ulong_t)&loongson_gpio_ls3a5000_data,306 },307 {308 .id = "LOON000A",309 .driver_data = (kernel_ulong_t)&loongson_gpio_ls2k2000_data0,310 },311 {312 .id = "LOON000B",313 .driver_data = (kernel_ulong_t)&loongson_gpio_ls2k2000_data1,314 },315 {316 .id = "LOON000C",317 .driver_data = (kernel_ulong_t)&loongson_gpio_ls2k2000_data2,318 },319 {}320};321MODULE_DEVICE_TABLE(acpi, loongson_gpio_acpi_match);322 323static struct platform_driver loongson_gpio_driver = {324 .driver = {325 .name = "loongson-gpio",326 .of_match_table = loongson_gpio_of_match,327 .acpi_match_table = loongson_gpio_acpi_match,328 },329 .probe = loongson_gpio_probe,330};331 332static int __init loongson_gpio_setup(void)333{334 return platform_driver_register(&loongson_gpio_driver);335}336postcore_initcall(loongson_gpio_setup);337 338MODULE_DESCRIPTION("Loongson gpio driver");339MODULE_LICENSE("GPL");340