1 /* 2 * Intel Merrifield SoC GPIO driver 3 * 4 * Copyright (c) 2016 Intel Corporation. 5 * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 12 #include <linux/bitops.h> 13 #include <linux/gpio/driver.h> 14 #include <linux/gpio.h> 15 #include <linux/init.h> 16 #include <linux/interrupt.h> 17 #include <linux/io.h> 18 #include <linux/module.h> 19 #include <linux/pci.h> 20 #include <linux/pinctrl/consumer.h> 21 22 #define GCCR 0x000 /* controller configuration */ 23 #define GPLR 0x004 /* pin level r/o */ 24 #define GPDR 0x01c /* pin direction */ 25 #define GPSR 0x034 /* pin set w/o */ 26 #define GPCR 0x04c /* pin clear w/o */ 27 #define GRER 0x064 /* rising edge detect */ 28 #define GFER 0x07c /* falling edge detect */ 29 #define GFBR 0x094 /* glitch filter bypass */ 30 #define GIMR 0x0ac /* interrupt mask */ 31 #define GISR 0x0c4 /* interrupt source */ 32 #define GITR 0x300 /* input type */ 33 #define GLPR 0x318 /* level input polarity */ 34 #define GWMR 0x400 /* wake mask */ 35 #define GWSR 0x418 /* wake source */ 36 #define GSIR 0xc00 /* secure input */ 37 38 /* Intel Merrifield has 192 GPIO pins */ 39 #define MRFLD_NGPIO 192 40 41 struct mrfld_gpio_pinrange { 42 unsigned int gpio_base; 43 unsigned int pin_base; 44 unsigned int npins; 45 }; 46 47 #define GPIO_PINRANGE(gstart, gend, pstart) \ 48 { \ 49 .gpio_base = (gstart), \ 50 .pin_base = (pstart), \ 51 .npins = (gend) - (gstart) + 1, \ 52 } 53 54 struct mrfld_gpio { 55 struct gpio_chip chip; 56 void __iomem *reg_base; 57 raw_spinlock_t lock; 58 struct device *dev; 59 }; 60 61 static const struct mrfld_gpio_pinrange mrfld_gpio_ranges[] = { 62 GPIO_PINRANGE(0, 11, 146), 63 GPIO_PINRANGE(12, 13, 144), 64 GPIO_PINRANGE(14, 15, 35), 65 GPIO_PINRANGE(16, 16, 164), 66 GPIO_PINRANGE(17, 18, 105), 67 GPIO_PINRANGE(19, 22, 101), 68 GPIO_PINRANGE(23, 30, 107), 69 GPIO_PINRANGE(32, 43, 67), 70 GPIO_PINRANGE(44, 63, 195), 71 GPIO_PINRANGE(64, 67, 140), 72 GPIO_PINRANGE(68, 69, 165), 73 GPIO_PINRANGE(70, 71, 65), 74 GPIO_PINRANGE(72, 76, 228), 75 GPIO_PINRANGE(77, 86, 37), 76 GPIO_PINRANGE(87, 87, 48), 77 GPIO_PINRANGE(88, 88, 47), 78 GPIO_PINRANGE(89, 96, 49), 79 GPIO_PINRANGE(97, 97, 34), 80 GPIO_PINRANGE(102, 119, 83), 81 GPIO_PINRANGE(120, 123, 79), 82 GPIO_PINRANGE(124, 135, 115), 83 GPIO_PINRANGE(137, 142, 158), 84 GPIO_PINRANGE(154, 163, 24), 85 GPIO_PINRANGE(164, 176, 215), 86 GPIO_PINRANGE(177, 189, 127), 87 GPIO_PINRANGE(190, 191, 178), 88 }; 89 90 static void __iomem *gpio_reg(struct gpio_chip *chip, unsigned int offset, 91 unsigned int reg_type_offset) 92 { 93 struct mrfld_gpio *priv = gpiochip_get_data(chip); 94 u8 reg = offset / 32; 95 96 return priv->reg_base + reg_type_offset + reg * 4; 97 } 98 99 static int mrfld_gpio_get(struct gpio_chip *chip, unsigned int offset) 100 { 101 void __iomem *gplr = gpio_reg(chip, offset, GPLR); 102 103 return !!(readl(gplr) & BIT(offset % 32)); 104 } 105 106 static void mrfld_gpio_set(struct gpio_chip *chip, unsigned int offset, 107 int value) 108 { 109 struct mrfld_gpio *priv = gpiochip_get_data(chip); 110 void __iomem *gpsr, *gpcr; 111 unsigned long flags; 112 113 raw_spin_lock_irqsave(&priv->lock, flags); 114 115 if (value) { 116 gpsr = gpio_reg(chip, offset, GPSR); 117 writel(BIT(offset % 32), gpsr); 118 } else { 119 gpcr = gpio_reg(chip, offset, GPCR); 120 writel(BIT(offset % 32), gpcr); 121 } 122 123 raw_spin_unlock_irqrestore(&priv->lock, flags); 124 } 125 126 static int mrfld_gpio_direction_input(struct gpio_chip *chip, 127 unsigned int offset) 128 { 129 struct mrfld_gpio *priv = gpiochip_get_data(chip); 130 void __iomem *gpdr = gpio_reg(chip, offset, GPDR); 131 unsigned long flags; 132 u32 value; 133 134 raw_spin_lock_irqsave(&priv->lock, flags); 135 136 value = readl(gpdr); 137 value &= ~BIT(offset % 32); 138 writel(value, gpdr); 139 140 raw_spin_unlock_irqrestore(&priv->lock, flags); 141 142 return 0; 143 } 144 145 static int mrfld_gpio_direction_output(struct gpio_chip *chip, 146 unsigned int offset, int value) 147 { 148 struct mrfld_gpio *priv = gpiochip_get_data(chip); 149 void __iomem *gpdr = gpio_reg(chip, offset, GPDR); 150 unsigned long flags; 151 152 mrfld_gpio_set(chip, offset, value); 153 154 raw_spin_lock_irqsave(&priv->lock, flags); 155 156 value = readl(gpdr); 157 value |= BIT(offset % 32); 158 writel(value, gpdr); 159 160 raw_spin_unlock_irqrestore(&priv->lock, flags); 161 162 return 0; 163 } 164 165 static int mrfld_gpio_get_direction(struct gpio_chip *chip, unsigned int offset) 166 { 167 void __iomem *gpdr = gpio_reg(chip, offset, GPDR); 168 169 return (readl(gpdr) & BIT(offset % 32)) ? GPIOF_DIR_OUT : GPIOF_DIR_IN; 170 } 171 172 static int mrfld_gpio_set_debounce(struct gpio_chip *chip, unsigned int offset, 173 unsigned int debounce) 174 { 175 struct mrfld_gpio *priv = gpiochip_get_data(chip); 176 void __iomem *gfbr = gpio_reg(chip, offset, GFBR); 177 unsigned long flags; 178 u32 value; 179 180 raw_spin_lock_irqsave(&priv->lock, flags); 181 182 if (debounce) 183 value = readl(gfbr) & ~BIT(offset % 32); 184 else 185 value = readl(gfbr) | BIT(offset % 32); 186 writel(value, gfbr); 187 188 raw_spin_unlock_irqrestore(&priv->lock, flags); 189 190 return 0; 191 } 192 193 static void mrfld_irq_ack(struct irq_data *d) 194 { 195 struct mrfld_gpio *priv = irq_data_get_irq_chip_data(d); 196 u32 gpio = irqd_to_hwirq(d); 197 void __iomem *gisr = gpio_reg(&priv->chip, gpio, GISR); 198 unsigned long flags; 199 200 raw_spin_lock_irqsave(&priv->lock, flags); 201 202 writel(BIT(gpio % 32), gisr); 203 204 raw_spin_unlock_irqrestore(&priv->lock, flags); 205 } 206 207 static void mrfld_irq_unmask_mask(struct irq_data *d, bool unmask) 208 { 209 struct mrfld_gpio *priv = irq_data_get_irq_chip_data(d); 210 u32 gpio = irqd_to_hwirq(d); 211 void __iomem *gimr = gpio_reg(&priv->chip, gpio, GIMR); 212 unsigned long flags; 213 u32 value; 214 215 raw_spin_lock_irqsave(&priv->lock, flags); 216 217 if (unmask) 218 value = readl(gimr) | BIT(gpio % 32); 219 else 220 value = readl(gimr) & ~BIT(gpio % 32); 221 writel(value, gimr); 222 223 raw_spin_unlock_irqrestore(&priv->lock, flags); 224 } 225 226 static void mrfld_irq_mask(struct irq_data *d) 227 { 228 mrfld_irq_unmask_mask(d, false); 229 } 230 231 static void mrfld_irq_unmask(struct irq_data *d) 232 { 233 mrfld_irq_unmask_mask(d, true); 234 } 235 236 static int mrfld_irq_set_type(struct irq_data *d, unsigned int type) 237 { 238 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 239 struct mrfld_gpio *priv = gpiochip_get_data(gc); 240 u32 gpio = irqd_to_hwirq(d); 241 void __iomem *grer = gpio_reg(&priv->chip, gpio, GRER); 242 void __iomem *gfer = gpio_reg(&priv->chip, gpio, GFER); 243 void __iomem *gitr = gpio_reg(&priv->chip, gpio, GITR); 244 void __iomem *glpr = gpio_reg(&priv->chip, gpio, GLPR); 245 unsigned long flags; 246 u32 value; 247 248 raw_spin_lock_irqsave(&priv->lock, flags); 249 250 if (type & IRQ_TYPE_EDGE_RISING) 251 value = readl(grer) | BIT(gpio % 32); 252 else 253 value = readl(grer) & ~BIT(gpio % 32); 254 writel(value, grer); 255 256 if (type & IRQ_TYPE_EDGE_FALLING) 257 value = readl(gfer) | BIT(gpio % 32); 258 else 259 value = readl(gfer) & ~BIT(gpio % 32); 260 writel(value, gfer); 261 262 /* 263 * To prevent glitches from triggering an unintended level interrupt, 264 * configure GLPR register first and then configure GITR. 265 */ 266 if (type & IRQ_TYPE_LEVEL_LOW) 267 value = readl(glpr) | BIT(gpio % 32); 268 else 269 value = readl(glpr) & ~BIT(gpio % 32); 270 writel(value, glpr); 271 272 if (type & IRQ_TYPE_LEVEL_MASK) { 273 value = readl(gitr) | BIT(gpio % 32); 274 writel(value, gitr); 275 276 irq_set_handler_locked(d, handle_level_irq); 277 } else if (type & IRQ_TYPE_EDGE_BOTH) { 278 value = readl(gitr) & ~BIT(gpio % 32); 279 writel(value, gitr); 280 281 irq_set_handler_locked(d, handle_edge_irq); 282 } 283 284 raw_spin_unlock_irqrestore(&priv->lock, flags); 285 286 return 0; 287 } 288 289 static int mrfld_irq_set_wake(struct irq_data *d, unsigned int on) 290 { 291 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 292 struct mrfld_gpio *priv = gpiochip_get_data(gc); 293 u32 gpio = irqd_to_hwirq(d); 294 void __iomem *gwmr = gpio_reg(&priv->chip, gpio, GWMR); 295 void __iomem *gwsr = gpio_reg(&priv->chip, gpio, GWSR); 296 unsigned long flags; 297 u32 value; 298 299 raw_spin_lock_irqsave(&priv->lock, flags); 300 301 /* Clear the existing wake status */ 302 writel(BIT(gpio % 32), gwsr); 303 304 if (on) 305 value = readl(gwmr) | BIT(gpio % 32); 306 else 307 value = readl(gwmr) & ~BIT(gpio % 32); 308 writel(value, gwmr); 309 310 raw_spin_unlock_irqrestore(&priv->lock, flags); 311 312 dev_dbg(priv->dev, "%sable wake for gpio %u\n", on ? "en" : "dis", gpio); 313 return 0; 314 } 315 316 static struct irq_chip mrfld_irqchip = { 317 .name = "gpio-merrifield", 318 .irq_ack = mrfld_irq_ack, 319 .irq_mask = mrfld_irq_mask, 320 .irq_unmask = mrfld_irq_unmask, 321 .irq_set_type = mrfld_irq_set_type, 322 .irq_set_wake = mrfld_irq_set_wake, 323 }; 324 325 static void mrfld_irq_handler(struct irq_desc *desc) 326 { 327 struct gpio_chip *gc = irq_desc_get_handler_data(desc); 328 struct mrfld_gpio *priv = gpiochip_get_data(gc); 329 struct irq_chip *irqchip = irq_desc_get_chip(desc); 330 unsigned long base, gpio; 331 332 chained_irq_enter(irqchip, desc); 333 334 /* Check GPIO controller to check which pin triggered the interrupt */ 335 for (base = 0; base < priv->chip.ngpio; base += 32) { 336 void __iomem *gisr = gpio_reg(&priv->chip, base, GISR); 337 void __iomem *gimr = gpio_reg(&priv->chip, base, GIMR); 338 unsigned long pending, enabled; 339 340 pending = readl(gisr); 341 enabled = readl(gimr); 342 343 /* Only interrupts that are enabled */ 344 pending &= enabled; 345 346 for_each_set_bit(gpio, &pending, 32) { 347 unsigned int irq; 348 349 irq = irq_find_mapping(gc->irqdomain, base + gpio); 350 generic_handle_irq(irq); 351 } 352 } 353 354 chained_irq_exit(irqchip, desc); 355 } 356 357 static void mrfld_irq_init_hw(struct mrfld_gpio *priv) 358 { 359 void __iomem *reg; 360 unsigned int base; 361 362 for (base = 0; base < priv->chip.ngpio; base += 32) { 363 /* Clear the rising-edge detect register */ 364 reg = gpio_reg(&priv->chip, base, GRER); 365 writel(0, reg); 366 /* Clear the falling-edge detect register */ 367 reg = gpio_reg(&priv->chip, base, GFER); 368 writel(0, reg); 369 } 370 } 371 372 static int mrfld_gpio_probe(struct pci_dev *pdev, const struct pci_device_id *id) 373 { 374 const struct mrfld_gpio_pinrange *range; 375 struct mrfld_gpio *priv; 376 u32 gpio_base, irq_base; 377 void __iomem *base; 378 unsigned int i; 379 int retval; 380 381 retval = pcim_enable_device(pdev); 382 if (retval) 383 return retval; 384 385 retval = pcim_iomap_regions(pdev, BIT(1) | BIT(0), pci_name(pdev)); 386 if (retval) { 387 dev_err(&pdev->dev, "I/O memory mapping error\n"); 388 return retval; 389 } 390 391 base = pcim_iomap_table(pdev)[1]; 392 393 irq_base = readl(base); 394 gpio_base = readl(sizeof(u32) + base); 395 396 /* Release the IO mapping, since we already get the info from BAR1 */ 397 pcim_iounmap_regions(pdev, BIT(1)); 398 399 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); 400 if (!priv) { 401 dev_err(&pdev->dev, "can't allocate chip data\n"); 402 return -ENOMEM; 403 } 404 405 priv->dev = &pdev->dev; 406 priv->reg_base = pcim_iomap_table(pdev)[0]; 407 408 priv->chip.label = dev_name(&pdev->dev); 409 priv->chip.parent = &pdev->dev; 410 priv->chip.request = gpiochip_generic_request; 411 priv->chip.free = gpiochip_generic_free; 412 priv->chip.direction_input = mrfld_gpio_direction_input; 413 priv->chip.direction_output = mrfld_gpio_direction_output; 414 priv->chip.get = mrfld_gpio_get; 415 priv->chip.set = mrfld_gpio_set; 416 priv->chip.get_direction = mrfld_gpio_get_direction; 417 priv->chip.set_debounce = mrfld_gpio_set_debounce; 418 priv->chip.base = gpio_base; 419 priv->chip.ngpio = MRFLD_NGPIO; 420 priv->chip.can_sleep = false; 421 422 raw_spin_lock_init(&priv->lock); 423 424 pci_set_drvdata(pdev, priv); 425 retval = devm_gpiochip_add_data(&pdev->dev, &priv->chip, priv); 426 if (retval) { 427 dev_err(&pdev->dev, "gpiochip_add error %d\n", retval); 428 return retval; 429 } 430 431 for (i = 0; i < ARRAY_SIZE(mrfld_gpio_ranges); i++) { 432 range = &mrfld_gpio_ranges[i]; 433 retval = gpiochip_add_pin_range(&priv->chip, 434 "pinctrl-merrifield", 435 range->gpio_base, 436 range->pin_base, 437 range->npins); 438 if (retval) { 439 dev_err(&pdev->dev, "failed to add GPIO pin range\n"); 440 return retval; 441 } 442 } 443 444 retval = gpiochip_irqchip_add(&priv->chip, &mrfld_irqchip, irq_base, 445 handle_bad_irq, IRQ_TYPE_NONE); 446 if (retval) { 447 dev_err(&pdev->dev, "could not connect irqchip to gpiochip\n"); 448 return retval; 449 } 450 451 mrfld_irq_init_hw(priv); 452 453 gpiochip_set_chained_irqchip(&priv->chip, &mrfld_irqchip, pdev->irq, 454 mrfld_irq_handler); 455 456 return 0; 457 } 458 459 static const struct pci_device_id mrfld_gpio_ids[] = { 460 { PCI_VDEVICE(INTEL, 0x1199) }, 461 { } 462 }; 463 MODULE_DEVICE_TABLE(pci, mrfld_gpio_ids); 464 465 static struct pci_driver mrfld_gpio_driver = { 466 .name = "gpio-merrifield", 467 .id_table = mrfld_gpio_ids, 468 .probe = mrfld_gpio_probe, 469 }; 470 471 module_pci_driver(mrfld_gpio_driver); 472 473 MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>"); 474 MODULE_DESCRIPTION("Intel Merrifield SoC GPIO driver"); 475 MODULE_LICENSE("GPL v2"); 476