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 int 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 return 0; 118 } 119 120 static int loongson_gpio_to_irq(struct gpio_chip *chip, unsigned int offset) 121 { 122 unsigned int u; 123 struct platform_device *pdev = to_platform_device(chip->parent); 124 struct loongson_gpio_chip *lgpio = to_loongson_gpio_chip(chip); 125 126 if (lgpio->chip_data->mode == BIT_CTRL_MODE) { 127 /* Get the register index from offset then multiply by bytes per register */ 128 u = readl(lgpio->reg_base + lgpio->chip_data->inten_offset + (offset / 32) * 4); 129 u |= BIT(offset % 32); 130 writel(u, lgpio->reg_base + lgpio->chip_data->inten_offset + (offset / 32) * 4); 131 } else { 132 writeb(1, lgpio->reg_base + lgpio->chip_data->inten_offset + offset); 133 } 134 135 return platform_get_irq(pdev, offset); 136 } 137 138 static int loongson_gpio_init(struct device *dev, struct loongson_gpio_chip *lgpio, 139 void __iomem *reg_base) 140 { 141 int ret; 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_rv = loongson_gpio_set; 161 lgpio->chip.parent = dev; 162 spin_lock_init(&lgpio->lock); 163 } 164 165 lgpio->chip.label = lgpio->chip_data->label; 166 lgpio->chip.can_sleep = false; 167 if (lgpio->chip_data->inten_offset) 168 lgpio->chip.to_irq = loongson_gpio_to_irq; 169 170 return devm_gpiochip_add_data(dev, &lgpio->chip, lgpio); 171 } 172 173 static int loongson_gpio_probe(struct platform_device *pdev) 174 { 175 void __iomem *reg_base; 176 struct loongson_gpio_chip *lgpio; 177 struct device *dev = &pdev->dev; 178 179 lgpio = devm_kzalloc(dev, sizeof(*lgpio), GFP_KERNEL); 180 if (!lgpio) 181 return -ENOMEM; 182 183 lgpio->chip_data = device_get_match_data(dev); 184 185 reg_base = devm_platform_ioremap_resource(pdev, 0); 186 if (IS_ERR(reg_base)) 187 return PTR_ERR(reg_base); 188 189 return loongson_gpio_init(dev, lgpio, reg_base); 190 } 191 192 static const struct loongson_gpio_chip_data loongson_gpio_ls2k_data = { 193 .label = "ls2k_gpio", 194 .mode = BIT_CTRL_MODE, 195 .conf_offset = 0x0, 196 .in_offset = 0x20, 197 .out_offset = 0x10, 198 .inten_offset = 0x30, 199 }; 200 201 static const struct loongson_gpio_chip_data loongson_gpio_ls2k0500_data0 = { 202 .label = "ls2k0500_gpio", 203 .mode = BIT_CTRL_MODE, 204 .conf_offset = 0x0, 205 .in_offset = 0x8, 206 .out_offset = 0x10, 207 .inten_offset = 0xb0, 208 }; 209 210 static const struct loongson_gpio_chip_data loongson_gpio_ls2k0500_data1 = { 211 .label = "ls2k0500_gpio", 212 .mode = BIT_CTRL_MODE, 213 .conf_offset = 0x0, 214 .in_offset = 0x8, 215 .out_offset = 0x10, 216 .inten_offset = 0x98, 217 }; 218 219 static const struct loongson_gpio_chip_data loongson_gpio_ls2k2000_data0 = { 220 .label = "ls2k2000_gpio", 221 .mode = BIT_CTRL_MODE, 222 .conf_offset = 0x0, 223 .in_offset = 0xc, 224 .out_offset = 0x8, 225 }; 226 227 static const struct loongson_gpio_chip_data loongson_gpio_ls2k2000_data1 = { 228 .label = "ls2k2000_gpio", 229 .mode = BIT_CTRL_MODE, 230 .conf_offset = 0x0, 231 .in_offset = 0x20, 232 .out_offset = 0x10, 233 }; 234 235 static const struct loongson_gpio_chip_data loongson_gpio_ls2k2000_data2 = { 236 .label = "ls2k2000_gpio", 237 .mode = BIT_CTRL_MODE, 238 .conf_offset = 0x4, 239 .in_offset = 0x8, 240 .out_offset = 0x0, 241 }; 242 243 static const struct loongson_gpio_chip_data loongson_gpio_ls3a5000_data = { 244 .label = "ls3a5000_gpio", 245 .mode = BIT_CTRL_MODE, 246 .conf_offset = 0x0, 247 .in_offset = 0xc, 248 .out_offset = 0x8, 249 }; 250 251 static const struct loongson_gpio_chip_data loongson_gpio_ls7a_data = { 252 .label = "ls7a_gpio", 253 .mode = BYTE_CTRL_MODE, 254 .conf_offset = 0x800, 255 .in_offset = 0xa00, 256 .out_offset = 0x900, 257 }; 258 259 /* LS7A2000 chipset GPIO */ 260 static const struct loongson_gpio_chip_data loongson_gpio_ls7a2000_data0 = { 261 .label = "ls7a2000_gpio", 262 .mode = BYTE_CTRL_MODE, 263 .conf_offset = 0x800, 264 .in_offset = 0xa00, 265 .out_offset = 0x900, 266 }; 267 268 /* LS7A2000 ACPI GPIO */ 269 static const struct loongson_gpio_chip_data loongson_gpio_ls7a2000_data1 = { 270 .label = "ls7a2000_gpio", 271 .mode = BIT_CTRL_MODE, 272 .conf_offset = 0x4, 273 .in_offset = 0x8, 274 .out_offset = 0x0, 275 }; 276 277 /* Loongson-3A6000 node GPIO */ 278 static const struct loongson_gpio_chip_data loongson_gpio_ls3a6000_data = { 279 .label = "ls3a6000_gpio", 280 .mode = BIT_CTRL_MODE, 281 .conf_offset = 0x0, 282 .in_offset = 0xc, 283 .out_offset = 0x8, 284 }; 285 286 static const struct of_device_id loongson_gpio_of_match[] = { 287 { 288 .compatible = "loongson,ls2k-gpio", 289 .data = &loongson_gpio_ls2k_data, 290 }, 291 { 292 .compatible = "loongson,ls2k0500-gpio0", 293 .data = &loongson_gpio_ls2k0500_data0, 294 }, 295 { 296 .compatible = "loongson,ls2k0500-gpio1", 297 .data = &loongson_gpio_ls2k0500_data1, 298 }, 299 { 300 .compatible = "loongson,ls2k2000-gpio0", 301 .data = &loongson_gpio_ls2k2000_data0, 302 }, 303 { 304 .compatible = "loongson,ls2k2000-gpio1", 305 .data = &loongson_gpio_ls2k2000_data1, 306 }, 307 { 308 .compatible = "loongson,ls2k2000-gpio2", 309 .data = &loongson_gpio_ls2k2000_data2, 310 }, 311 { 312 .compatible = "loongson,ls3a5000-gpio", 313 .data = &loongson_gpio_ls3a5000_data, 314 }, 315 { 316 .compatible = "loongson,ls7a-gpio", 317 .data = &loongson_gpio_ls7a_data, 318 }, 319 { 320 .compatible = "loongson,ls7a2000-gpio1", 321 .data = &loongson_gpio_ls7a2000_data0, 322 }, 323 { 324 .compatible = "loongson,ls7a2000-gpio2", 325 .data = &loongson_gpio_ls7a2000_data1, 326 }, 327 { 328 .compatible = "loongson,ls3a6000-gpio", 329 .data = &loongson_gpio_ls3a6000_data, 330 }, 331 {} 332 }; 333 MODULE_DEVICE_TABLE(of, loongson_gpio_of_match); 334 335 static const struct acpi_device_id loongson_gpio_acpi_match[] = { 336 { 337 .id = "LOON0002", 338 .driver_data = (kernel_ulong_t)&loongson_gpio_ls7a_data, 339 }, 340 { 341 .id = "LOON0007", 342 .driver_data = (kernel_ulong_t)&loongson_gpio_ls3a5000_data, 343 }, 344 { 345 .id = "LOON000A", 346 .driver_data = (kernel_ulong_t)&loongson_gpio_ls2k2000_data0, 347 }, 348 { 349 .id = "LOON000B", 350 .driver_data = (kernel_ulong_t)&loongson_gpio_ls2k2000_data1, 351 }, 352 { 353 .id = "LOON000C", 354 .driver_data = (kernel_ulong_t)&loongson_gpio_ls2k2000_data2, 355 }, 356 { 357 .id = "LOON000D", 358 .driver_data = (kernel_ulong_t)&loongson_gpio_ls7a2000_data0, 359 }, 360 { 361 .id = "LOON000E", 362 .driver_data = (kernel_ulong_t)&loongson_gpio_ls7a2000_data1, 363 }, 364 { 365 .id = "LOON000F", 366 .driver_data = (kernel_ulong_t)&loongson_gpio_ls3a6000_data, 367 }, 368 {} 369 }; 370 MODULE_DEVICE_TABLE(acpi, loongson_gpio_acpi_match); 371 372 static struct platform_driver loongson_gpio_driver = { 373 .driver = { 374 .name = "loongson-gpio", 375 .of_match_table = loongson_gpio_of_match, 376 .acpi_match_table = loongson_gpio_acpi_match, 377 }, 378 .probe = loongson_gpio_probe, 379 }; 380 381 static int __init loongson_gpio_setup(void) 382 { 383 return platform_driver_register(&loongson_gpio_driver); 384 } 385 postcore_initcall(loongson_gpio_setup); 386 387 MODULE_DESCRIPTION("Loongson gpio driver"); 388 MODULE_LICENSE("GPL"); 389