1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * GPIO driver for the SMSC SCH311x Super-I/O chips 4 * 5 * Copyright (C) 2013 Bruno Randolf <br1@einfach.org> 6 * 7 * SuperIO functions and chip detection: 8 * (c) Copyright 2008 Wim Van Sebroeck <wim@iguana.be>. 9 */ 10 11 #include <linux/ioport.h> 12 #include <linux/module.h> 13 #include <linux/kernel.h> 14 #include <linux/init.h> 15 #include <linux/platform_device.h> 16 #include <linux/gpio/driver.h> 17 #include <linux/bitops.h> 18 #include <linux/io.h> 19 20 #define DRV_NAME "gpio-sch311x" 21 22 #define SCH311X_GPIO_CONF_DIR BIT(0) 23 #define SCH311X_GPIO_CONF_INVERT BIT(1) 24 #define SCH311X_GPIO_CONF_OPEN_DRAIN BIT(7) 25 26 #define SIO_CONFIG_KEY_ENTER 0x55 27 #define SIO_CONFIG_KEY_EXIT 0xaa 28 29 #define GP1 0x4b 30 31 static int sch311x_ioports[] = { 0x2e, 0x4e, 0x162e, 0x164e }; 32 33 static struct platform_device *sch311x_gpio_pdev; 34 35 struct sch311x_pdev_data { /* platform device data */ 36 unsigned short runtime_reg; /* runtime register base address */ 37 }; 38 39 struct sch311x_gpio_block { /* one GPIO block runtime data */ 40 struct gpio_chip chip; 41 unsigned short data_reg; /* from definition below */ 42 unsigned short *config_regs; /* pointer to definition below */ 43 unsigned short runtime_reg; /* runtime register */ 44 spinlock_t lock; /* lock for this GPIO block */ 45 }; 46 47 struct sch311x_gpio_priv { /* driver private data */ 48 struct sch311x_gpio_block blocks[6]; 49 }; 50 51 struct sch311x_gpio_block_def { /* register address definitions */ 52 unsigned short data_reg; 53 unsigned short config_regs[8]; 54 unsigned short base; 55 }; 56 57 /* Note: some GPIOs are not available, these are marked with 0x00 */ 58 59 static struct sch311x_gpio_block_def sch311x_gpio_blocks[] = { 60 { 61 .data_reg = 0x4b, /* GP1 */ 62 .config_regs = {0x23, 0x24, 0x25, 0x26, 0x27, 0x29, 0x2a, 0x2b}, 63 .base = 10, 64 }, 65 { 66 .data_reg = 0x4c, /* GP2 */ 67 .config_regs = {0x00, 0x2c, 0x2d, 0x00, 0x00, 0x00, 0x00, 0x32}, 68 .base = 20, 69 }, 70 { 71 .data_reg = 0x4d, /* GP3 */ 72 .config_regs = {0x33, 0x34, 0x35, 0x36, 0x37, 0x00, 0x39, 0x3a}, 73 .base = 30, 74 }, 75 { 76 .data_reg = 0x4e, /* GP4 */ 77 .config_regs = {0x3b, 0x00, 0x3d, 0x00, 0x6e, 0x6f, 0x72, 0x73}, 78 .base = 40, 79 }, 80 { 81 .data_reg = 0x4f, /* GP5 */ 82 .config_regs = {0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46}, 83 .base = 50, 84 }, 85 { 86 .data_reg = 0x50, /* GP6 */ 87 .config_regs = {0x47, 0x48, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59}, 88 .base = 60, 89 }, 90 }; 91 92 /* 93 * Super-IO functions 94 */ 95 96 static inline int sch311x_sio_enter(int sio_config_port) 97 { 98 /* Don't step on other drivers' I/O space by accident. */ 99 if (!request_muxed_region(sio_config_port, 2, DRV_NAME)) { 100 pr_err(DRV_NAME "I/O address 0x%04x already in use\n", 101 sio_config_port); 102 return -EBUSY; 103 } 104 105 outb(SIO_CONFIG_KEY_ENTER, sio_config_port); 106 return 0; 107 } 108 109 static inline void sch311x_sio_exit(int sio_config_port) 110 { 111 outb(SIO_CONFIG_KEY_EXIT, sio_config_port); 112 release_region(sio_config_port, 2); 113 } 114 115 static inline int sch311x_sio_inb(int sio_config_port, int reg) 116 { 117 outb(reg, sio_config_port); 118 return inb(sio_config_port + 1); 119 } 120 121 static inline void sch311x_sio_outb(int sio_config_port, int reg, int val) 122 { 123 outb(reg, sio_config_port); 124 outb(val, sio_config_port + 1); 125 } 126 127 128 /* 129 * GPIO functions 130 */ 131 132 static int sch311x_gpio_request(struct gpio_chip *chip, unsigned offset) 133 { 134 struct sch311x_gpio_block *block = gpiochip_get_data(chip); 135 136 if (block->config_regs[offset] == 0) /* GPIO is not available */ 137 return -ENODEV; 138 139 if (!request_region(block->runtime_reg + block->config_regs[offset], 140 1, DRV_NAME)) { 141 dev_err(chip->parent, "Failed to request region 0x%04x.\n", 142 block->runtime_reg + block->config_regs[offset]); 143 return -EBUSY; 144 } 145 return 0; 146 } 147 148 static void sch311x_gpio_free(struct gpio_chip *chip, unsigned offset) 149 { 150 struct sch311x_gpio_block *block = gpiochip_get_data(chip); 151 152 if (block->config_regs[offset] == 0) /* GPIO is not available */ 153 return; 154 155 release_region(block->runtime_reg + block->config_regs[offset], 1); 156 } 157 158 static int sch311x_gpio_get(struct gpio_chip *chip, unsigned offset) 159 { 160 struct sch311x_gpio_block *block = gpiochip_get_data(chip); 161 u8 data; 162 163 spin_lock(&block->lock); 164 data = inb(block->runtime_reg + block->data_reg); 165 spin_unlock(&block->lock); 166 167 return !!(data & BIT(offset)); 168 } 169 170 static void __sch311x_gpio_set(struct sch311x_gpio_block *block, 171 unsigned offset, int value) 172 { 173 u8 data = inb(block->runtime_reg + block->data_reg); 174 if (value) 175 data |= BIT(offset); 176 else 177 data &= ~BIT(offset); 178 outb(data, block->runtime_reg + block->data_reg); 179 } 180 181 static void sch311x_gpio_set(struct gpio_chip *chip, unsigned offset, 182 int value) 183 { 184 struct sch311x_gpio_block *block = gpiochip_get_data(chip); 185 186 spin_lock(&block->lock); 187 __sch311x_gpio_set(block, offset, value); 188 spin_unlock(&block->lock); 189 } 190 191 static int sch311x_gpio_direction_in(struct gpio_chip *chip, unsigned offset) 192 { 193 struct sch311x_gpio_block *block = gpiochip_get_data(chip); 194 u8 data; 195 196 spin_lock(&block->lock); 197 data = inb(block->runtime_reg + block->config_regs[offset]); 198 data |= SCH311X_GPIO_CONF_DIR; 199 outb(data, block->runtime_reg + block->config_regs[offset]); 200 spin_unlock(&block->lock); 201 202 return 0; 203 } 204 205 static int sch311x_gpio_direction_out(struct gpio_chip *chip, unsigned offset, 206 int value) 207 { 208 struct sch311x_gpio_block *block = gpiochip_get_data(chip); 209 u8 data; 210 211 spin_lock(&block->lock); 212 213 data = inb(block->runtime_reg + block->config_regs[offset]); 214 data &= ~SCH311X_GPIO_CONF_DIR; 215 outb(data, block->runtime_reg + block->config_regs[offset]); 216 __sch311x_gpio_set(block, offset, value); 217 218 spin_unlock(&block->lock); 219 return 0; 220 } 221 222 static int sch311x_gpio_get_direction(struct gpio_chip *chip, unsigned offset) 223 { 224 struct sch311x_gpio_block *block = gpiochip_get_data(chip); 225 u8 data; 226 227 spin_lock(&block->lock); 228 data = inb(block->runtime_reg + block->config_regs[offset]); 229 spin_unlock(&block->lock); 230 231 if (data & SCH311X_GPIO_CONF_DIR) 232 return GPIO_LINE_DIRECTION_IN; 233 234 return GPIO_LINE_DIRECTION_OUT; 235 } 236 237 static int sch311x_gpio_set_config(struct gpio_chip *chip, unsigned offset, 238 unsigned long config) 239 { 240 struct sch311x_gpio_block *block = gpiochip_get_data(chip); 241 enum pin_config_param param = pinconf_to_config_param(config); 242 u8 data; 243 244 switch (param) { 245 case PIN_CONFIG_DRIVE_OPEN_DRAIN: 246 spin_lock(&block->lock); 247 data = inb(block->runtime_reg + block->config_regs[offset]); 248 data |= SCH311X_GPIO_CONF_OPEN_DRAIN; 249 outb(data, block->runtime_reg + block->config_regs[offset]); 250 spin_unlock(&block->lock); 251 return 0; 252 case PIN_CONFIG_DRIVE_PUSH_PULL: 253 spin_lock(&block->lock); 254 data = inb(block->runtime_reg + block->config_regs[offset]); 255 data &= ~SCH311X_GPIO_CONF_OPEN_DRAIN; 256 outb(data, block->runtime_reg + block->config_regs[offset]); 257 spin_unlock(&block->lock); 258 return 0; 259 default: 260 break; 261 } 262 return -ENOTSUPP; 263 } 264 265 static int sch311x_gpio_probe(struct platform_device *pdev) 266 { 267 struct sch311x_pdev_data *pdata = dev_get_platdata(&pdev->dev); 268 struct sch311x_gpio_priv *priv; 269 struct sch311x_gpio_block *block; 270 int err, i; 271 272 /* we can register all GPIO data registers at once */ 273 if (!devm_request_region(&pdev->dev, pdata->runtime_reg + GP1, 6, 274 DRV_NAME)) { 275 dev_err(&pdev->dev, "Failed to request region 0x%04x-0x%04x.\n", 276 pdata->runtime_reg + GP1, pdata->runtime_reg + GP1 + 5); 277 return -EBUSY; 278 } 279 280 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); 281 if (!priv) 282 return -ENOMEM; 283 284 for (i = 0; i < ARRAY_SIZE(priv->blocks); i++) { 285 block = &priv->blocks[i]; 286 287 spin_lock_init(&block->lock); 288 289 block->chip.label = DRV_NAME; 290 block->chip.owner = THIS_MODULE; 291 block->chip.request = sch311x_gpio_request; 292 block->chip.free = sch311x_gpio_free; 293 block->chip.direction_input = sch311x_gpio_direction_in; 294 block->chip.direction_output = sch311x_gpio_direction_out; 295 block->chip.get_direction = sch311x_gpio_get_direction; 296 block->chip.set_config = sch311x_gpio_set_config; 297 block->chip.get = sch311x_gpio_get; 298 block->chip.set = sch311x_gpio_set; 299 block->chip.ngpio = 8; 300 block->chip.parent = &pdev->dev; 301 block->chip.base = sch311x_gpio_blocks[i].base; 302 block->config_regs = sch311x_gpio_blocks[i].config_regs; 303 block->data_reg = sch311x_gpio_blocks[i].data_reg; 304 block->runtime_reg = pdata->runtime_reg; 305 306 err = devm_gpiochip_add_data(&pdev->dev, &block->chip, block); 307 if (err < 0) { 308 dev_err(&pdev->dev, 309 "Could not register gpiochip, %d\n", err); 310 return err; 311 } 312 dev_info(&pdev->dev, 313 "SMSC SCH311x GPIO block %d registered.\n", i); 314 } 315 316 return 0; 317 } 318 319 static struct platform_driver sch311x_gpio_driver = { 320 .driver.name = DRV_NAME, 321 .probe = sch311x_gpio_probe, 322 }; 323 324 325 /* 326 * Init & exit routines 327 */ 328 329 static int __init sch311x_detect(int sio_config_port, unsigned short *addr) 330 { 331 int err = 0, reg; 332 unsigned short base_addr; 333 u8 dev_id; 334 335 err = sch311x_sio_enter(sio_config_port); 336 if (err) 337 return err; 338 339 /* Check device ID. */ 340 reg = sch311x_sio_inb(sio_config_port, 0x20); 341 switch (reg) { 342 case 0x7c: /* SCH3112 */ 343 dev_id = 2; 344 break; 345 case 0x7d: /* SCH3114 */ 346 dev_id = 4; 347 break; 348 case 0x7f: /* SCH3116 */ 349 dev_id = 6; 350 break; 351 default: 352 err = -ENODEV; 353 goto exit; 354 } 355 356 /* Select logical device A (runtime registers) */ 357 sch311x_sio_outb(sio_config_port, 0x07, 0x0a); 358 359 /* Check if Logical Device Register is currently active */ 360 if ((sch311x_sio_inb(sio_config_port, 0x30) & 0x01) == 0) 361 pr_info("Seems that LDN 0x0a is not active...\n"); 362 363 /* Get the base address of the runtime registers */ 364 base_addr = (sch311x_sio_inb(sio_config_port, 0x60) << 8) | 365 sch311x_sio_inb(sio_config_port, 0x61); 366 if (!base_addr) { 367 pr_err("Base address not set\n"); 368 err = -ENODEV; 369 goto exit; 370 } 371 *addr = base_addr; 372 373 pr_info("Found an SMSC SCH311%d chip at 0x%04x\n", dev_id, base_addr); 374 375 exit: 376 sch311x_sio_exit(sio_config_port); 377 return err; 378 } 379 380 static int __init sch311x_gpio_pdev_add(const unsigned short addr) 381 { 382 struct sch311x_pdev_data pdata; 383 int err; 384 385 pdata.runtime_reg = addr; 386 387 sch311x_gpio_pdev = platform_device_alloc(DRV_NAME, -1); 388 if (!sch311x_gpio_pdev) 389 return -ENOMEM; 390 391 err = platform_device_add_data(sch311x_gpio_pdev, 392 &pdata, sizeof(pdata)); 393 if (err) { 394 pr_err(DRV_NAME "Platform data allocation failed\n"); 395 goto err; 396 } 397 398 err = platform_device_add(sch311x_gpio_pdev); 399 if (err) { 400 pr_err(DRV_NAME "Device addition failed\n"); 401 goto err; 402 } 403 return 0; 404 405 err: 406 platform_device_put(sch311x_gpio_pdev); 407 return err; 408 } 409 410 static int __init sch311x_gpio_init(void) 411 { 412 int err, i; 413 unsigned short addr = 0; 414 415 for (i = 0; i < ARRAY_SIZE(sch311x_ioports); i++) 416 if (sch311x_detect(sch311x_ioports[i], &addr) == 0) 417 break; 418 419 if (!addr) 420 return -ENODEV; 421 422 err = platform_driver_register(&sch311x_gpio_driver); 423 if (err) 424 return err; 425 426 err = sch311x_gpio_pdev_add(addr); 427 if (err) 428 goto unreg_platform_driver; 429 430 return 0; 431 432 unreg_platform_driver: 433 platform_driver_unregister(&sch311x_gpio_driver); 434 return err; 435 } 436 437 static void __exit sch311x_gpio_exit(void) 438 { 439 platform_device_unregister(sch311x_gpio_pdev); 440 platform_driver_unregister(&sch311x_gpio_driver); 441 } 442 443 module_init(sch311x_gpio_init); 444 module_exit(sch311x_gpio_exit); 445 446 MODULE_AUTHOR("Bruno Randolf <br1@einfach.org>"); 447 MODULE_DESCRIPTION("SMSC SCH311x GPIO Driver"); 448 MODULE_LICENSE("GPL"); 449 MODULE_ALIAS("platform:gpio-sch311x"); 450