1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Loongson GPIO Support 4 * 5 * Copyright (C) 2022-2023 Loongson Technology Corporation Limited 6 */ 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 18 enum loongson_gpio_mode { 19 BIT_CTRL_MODE, 20 BYTE_CTRL_MODE, 21 }; 22 23 struct 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 32 struct loongson_gpio_chip { 33 struct gpio_chip chip; 34 spinlock_t lock; 35 void __iomem *reg_base; 36 const struct loongson_gpio_chip_data *chip_data; 37 }; 38 39 static inline struct loongson_gpio_chip *to_loongson_gpio_chip(struct gpio_chip *chip) 40 { 41 return container_of(chip, struct loongson_gpio_chip, chip); 42 } 43 44 static inline void loongson_commit_direction(struct loongson_gpio_chip *lgpio, unsigned int pin, 45 int input) 46 { 47 u8 bval = input ? 1 : 0; 48 49 writeb(bval, lgpio->reg_base + lgpio->chip_data->conf_offset + pin); 50 } 51 52 static void loongson_commit_level(struct loongson_gpio_chip *lgpio, unsigned int pin, int high) 53 { 54 u8 bval = high ? 1 : 0; 55 56 writeb(bval, lgpio->reg_base + lgpio->chip_data->out_offset + pin); 57 } 58 59 static int loongson_gpio_direction_input(struct gpio_chip *chip, unsigned int pin) 60 { 61 unsigned long flags; 62 struct loongson_gpio_chip *lgpio = to_loongson_gpio_chip(chip); 63 64 spin_lock_irqsave(&lgpio->lock, flags); 65 loongson_commit_direction(lgpio, pin, 1); 66 spin_unlock_irqrestore(&lgpio->lock, flags); 67 68 return 0; 69 } 70 71 static int loongson_gpio_direction_output(struct gpio_chip *chip, unsigned int pin, int value) 72 { 73 unsigned long flags; 74 struct loongson_gpio_chip *lgpio = to_loongson_gpio_chip(chip); 75 76 spin_lock_irqsave(&lgpio->lock, flags); 77 loongson_commit_level(lgpio, pin, value); 78 loongson_commit_direction(lgpio, pin, 0); 79 spin_unlock_irqrestore(&lgpio->lock, flags); 80 81 return 0; 82 } 83 84 static int loongson_gpio_get(struct gpio_chip *chip, unsigned int pin) 85 { 86 u8 bval; 87 int val; 88 struct loongson_gpio_chip *lgpio = to_loongson_gpio_chip(chip); 89 90 bval = readb(lgpio->reg_base + lgpio->chip_data->in_offset + pin); 91 val = bval & 1; 92 93 return val; 94 } 95 96 static int loongson_gpio_get_direction(struct gpio_chip *chip, unsigned int pin) 97 { 98 u8 bval; 99 struct loongson_gpio_chip *lgpio = to_loongson_gpio_chip(chip); 100 101 bval = readb(lgpio->reg_base + lgpio->chip_data->conf_offset + pin); 102 if (bval & 1) 103 return GPIO_LINE_DIRECTION_IN; 104 105 return GPIO_LINE_DIRECTION_OUT; 106 } 107 108 static void loongson_gpio_set(struct gpio_chip *chip, unsigned int pin, int value) 109 { 110 unsigned long flags; 111 struct loongson_gpio_chip *lgpio = to_loongson_gpio_chip(chip); 112 113 spin_lock_irqsave(&lgpio->lock, flags); 114 loongson_commit_level(lgpio, pin, value); 115 spin_unlock_irqrestore(&lgpio->lock, flags); 116 } 117 118 static int loongson_gpio_to_irq(struct gpio_chip *chip, unsigned int offset) 119 { 120 unsigned int u; 121 struct platform_device *pdev = to_platform_device(chip->parent); 122 struct loongson_gpio_chip *lgpio = to_loongson_gpio_chip(chip); 123 124 if (lgpio->chip_data->mode == BIT_CTRL_MODE) { 125 /* Get the register index from offset then multiply by bytes per register */ 126 u = readl(lgpio->reg_base + lgpio->chip_data->inten_offset + (offset / 32) * 4); 127 u |= BIT(offset % 32); 128 writel(u, lgpio->reg_base + lgpio->chip_data->inten_offset + (offset / 32) * 4); 129 } else { 130 writeb(1, lgpio->reg_base + lgpio->chip_data->inten_offset + offset); 131 } 132 133 return platform_get_irq(pdev, offset); 134 } 135 136 static int loongson_gpio_init(struct device *dev, struct loongson_gpio_chip *lgpio, 137 void __iomem *reg_base) 138 { 139 int ret; 140 141 lgpio->reg_base = reg_base; 142 if (lgpio->chip_data->mode == BIT_CTRL_MODE) { 143 ret = bgpio_init(&lgpio->chip, dev, 8, 144 lgpio->reg_base + lgpio->chip_data->in_offset, 145 lgpio->reg_base + lgpio->chip_data->out_offset, 146 NULL, NULL, 147 lgpio->reg_base + lgpio->chip_data->conf_offset, 148 0); 149 if (ret) { 150 dev_err(dev, "unable to init generic GPIO\n"); 151 return ret; 152 } 153 } else { 154 lgpio->chip.direction_input = loongson_gpio_direction_input; 155 lgpio->chip.get = loongson_gpio_get; 156 lgpio->chip.get_direction = loongson_gpio_get_direction; 157 lgpio->chip.direction_output = loongson_gpio_direction_output; 158 lgpio->chip.set = loongson_gpio_set; 159 lgpio->chip.parent = dev; 160 spin_lock_init(&lgpio->lock); 161 } 162 163 lgpio->chip.label = lgpio->chip_data->label; 164 lgpio->chip.can_sleep = false; 165 if (lgpio->chip_data->inten_offset) 166 lgpio->chip.to_irq = loongson_gpio_to_irq; 167 168 return devm_gpiochip_add_data(dev, &lgpio->chip, lgpio); 169 } 170 171 static int loongson_gpio_probe(struct platform_device *pdev) 172 { 173 void __iomem *reg_base; 174 struct loongson_gpio_chip *lgpio; 175 struct device *dev = &pdev->dev; 176 177 lgpio = devm_kzalloc(dev, sizeof(*lgpio), GFP_KERNEL); 178 if (!lgpio) 179 return -ENOMEM; 180 181 lgpio->chip_data = device_get_match_data(dev); 182 183 reg_base = devm_platform_ioremap_resource(pdev, 0); 184 if (IS_ERR(reg_base)) 185 return PTR_ERR(reg_base); 186 187 return loongson_gpio_init(dev, lgpio, reg_base); 188 } 189 190 static const struct loongson_gpio_chip_data loongson_gpio_ls2k_data = { 191 .label = "ls2k_gpio", 192 .mode = BIT_CTRL_MODE, 193 .conf_offset = 0x0, 194 .in_offset = 0x20, 195 .out_offset = 0x10, 196 .inten_offset = 0x30, 197 }; 198 199 static const struct loongson_gpio_chip_data loongson_gpio_ls2k0500_data0 = { 200 .label = "ls2k0500_gpio", 201 .mode = BIT_CTRL_MODE, 202 .conf_offset = 0x0, 203 .in_offset = 0x8, 204 .out_offset = 0x10, 205 .inten_offset = 0xb0, 206 }; 207 208 static const struct loongson_gpio_chip_data loongson_gpio_ls2k0500_data1 = { 209 .label = "ls2k0500_gpio", 210 .mode = BIT_CTRL_MODE, 211 .conf_offset = 0x0, 212 .in_offset = 0x8, 213 .out_offset = 0x10, 214 .inten_offset = 0x98, 215 }; 216 217 static const struct loongson_gpio_chip_data loongson_gpio_ls2k2000_data0 = { 218 .label = "ls2k2000_gpio", 219 .mode = BIT_CTRL_MODE, 220 .conf_offset = 0x0, 221 .in_offset = 0xc, 222 .out_offset = 0x8, 223 }; 224 225 static const struct loongson_gpio_chip_data loongson_gpio_ls2k2000_data1 = { 226 .label = "ls2k2000_gpio", 227 .mode = BIT_CTRL_MODE, 228 .conf_offset = 0x0, 229 .in_offset = 0x20, 230 .out_offset = 0x10, 231 }; 232 233 static const struct loongson_gpio_chip_data loongson_gpio_ls2k2000_data2 = { 234 .label = "ls2k2000_gpio", 235 .mode = BIT_CTRL_MODE, 236 .conf_offset = 0x4, 237 .in_offset = 0x8, 238 .out_offset = 0x0, 239 }; 240 241 static const struct loongson_gpio_chip_data loongson_gpio_ls3a5000_data = { 242 .label = "ls3a5000_gpio", 243 .mode = BIT_CTRL_MODE, 244 .conf_offset = 0x0, 245 .in_offset = 0xc, 246 .out_offset = 0x8, 247 }; 248 249 static const struct loongson_gpio_chip_data loongson_gpio_ls7a_data = { 250 .label = "ls7a_gpio", 251 .mode = BYTE_CTRL_MODE, 252 .conf_offset = 0x800, 253 .in_offset = 0xa00, 254 .out_offset = 0x900, 255 }; 256 257 /* LS7A2000 chipset GPIO */ 258 static const struct loongson_gpio_chip_data loongson_gpio_ls7a2000_data0 = { 259 .label = "ls7a2000_gpio", 260 .mode = BYTE_CTRL_MODE, 261 .conf_offset = 0x800, 262 .in_offset = 0xa00, 263 .out_offset = 0x900, 264 }; 265 266 /* LS7A2000 ACPI GPIO */ 267 static const struct loongson_gpio_chip_data loongson_gpio_ls7a2000_data1 = { 268 .label = "ls7a2000_gpio", 269 .mode = BYTE_CTRL_MODE, 270 .conf_offset = 0x4, 271 .in_offset = 0x8, 272 .out_offset = 0x0, 273 }; 274 275 /* Loongson-3A6000 node GPIO */ 276 static const struct loongson_gpio_chip_data loongson_gpio_ls3a6000_data = { 277 .label = "ls3a6000_gpio", 278 .mode = BIT_CTRL_MODE, 279 .conf_offset = 0x0, 280 .in_offset = 0xc, 281 .out_offset = 0x8, 282 }; 283 284 static const struct of_device_id loongson_gpio_of_match[] = { 285 { 286 .compatible = "loongson,ls2k-gpio", 287 .data = &loongson_gpio_ls2k_data, 288 }, 289 { 290 .compatible = "loongson,ls2k0500-gpio0", 291 .data = &loongson_gpio_ls2k0500_data0, 292 }, 293 { 294 .compatible = "loongson,ls2k0500-gpio1", 295 .data = &loongson_gpio_ls2k0500_data1, 296 }, 297 { 298 .compatible = "loongson,ls2k2000-gpio0", 299 .data = &loongson_gpio_ls2k2000_data0, 300 }, 301 { 302 .compatible = "loongson,ls2k2000-gpio1", 303 .data = &loongson_gpio_ls2k2000_data1, 304 }, 305 { 306 .compatible = "loongson,ls2k2000-gpio2", 307 .data = &loongson_gpio_ls2k2000_data2, 308 }, 309 { 310 .compatible = "loongson,ls3a5000-gpio", 311 .data = &loongson_gpio_ls3a5000_data, 312 }, 313 { 314 .compatible = "loongson,ls7a-gpio", 315 .data = &loongson_gpio_ls7a_data, 316 }, 317 { 318 .compatible = "loongson,ls7a2000-gpio1", 319 .data = &loongson_gpio_ls7a2000_data0, 320 }, 321 { 322 .compatible = "loongson,ls7a2000-gpio2", 323 .data = &loongson_gpio_ls7a2000_data1, 324 }, 325 { 326 .compatible = "loongson,ls3a6000-gpio", 327 .data = &loongson_gpio_ls3a6000_data, 328 }, 329 {} 330 }; 331 MODULE_DEVICE_TABLE(of, loongson_gpio_of_match); 332 333 static const struct acpi_device_id loongson_gpio_acpi_match[] = { 334 { 335 .id = "LOON0002", 336 .driver_data = (kernel_ulong_t)&loongson_gpio_ls7a_data, 337 }, 338 { 339 .id = "LOON0007", 340 .driver_data = (kernel_ulong_t)&loongson_gpio_ls3a5000_data, 341 }, 342 { 343 .id = "LOON000A", 344 .driver_data = (kernel_ulong_t)&loongson_gpio_ls2k2000_data0, 345 }, 346 { 347 .id = "LOON000B", 348 .driver_data = (kernel_ulong_t)&loongson_gpio_ls2k2000_data1, 349 }, 350 { 351 .id = "LOON000C", 352 .driver_data = (kernel_ulong_t)&loongson_gpio_ls2k2000_data2, 353 }, 354 { 355 .id = "LOON000D", 356 .driver_data = (kernel_ulong_t)&loongson_gpio_ls7a2000_data0, 357 }, 358 { 359 .id = "LOON000E", 360 .driver_data = (kernel_ulong_t)&loongson_gpio_ls7a2000_data1, 361 }, 362 { 363 .id = "LOON000F", 364 .driver_data = (kernel_ulong_t)&loongson_gpio_ls3a6000_data, 365 }, 366 {} 367 }; 368 MODULE_DEVICE_TABLE(acpi, loongson_gpio_acpi_match); 369 370 static struct platform_driver loongson_gpio_driver = { 371 .driver = { 372 .name = "loongson-gpio", 373 .of_match_table = loongson_gpio_of_match, 374 .acpi_match_table = loongson_gpio_acpi_match, 375 }, 376 .probe = loongson_gpio_probe, 377 }; 378 379 static int __init loongson_gpio_setup(void) 380 { 381 return platform_driver_register(&loongson_gpio_driver); 382 } 383 postcore_initcall(loongson_gpio_setup); 384 385 MODULE_DESCRIPTION("Loongson gpio driver"); 386 MODULE_LICENSE("GPL"); 387