drivers/gpio/gpio-vr41xx.c

   1 /*
   2  *  Driver for NEC VR4100 series General-purpose I/O Unit.
   3  *
   4  *  Copyright (C) 2002 MontaVista Software Inc.
   5  *      Author: Yoichi Yuasa <source@mvista.com>
   6  *  Copyright (C) 2003-2009  Yoichi Yuasa <yuasa@linux-mips.org>
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22 #include <linux/errno.h>
  23 #include <linux/fs.h>
  24 #include <linux/gpio.h>
  25 #include <linux/init.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/io.h>
  28 #include <linux/irq.h>
  29 #include <linux/kernel.h>
  30 #include <linux/module.h>
  31 #include <linux/platform_device.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/types.h>
  34
  35 #include <asm/vr41xx/giu.h>
  36 #include <asm/vr41xx/irq.h>
  37 #include <asm/vr41xx/vr41xx.h>
  38
  39 MODULE_AUTHOR("Yoichi Yuasa <yuasa@linux-mips.org>");
  40 MODULE_DESCRIPTION("NEC VR4100 series General-purpose I/O Unit driver");
  41 MODULE_LICENSE("GPL");
  42
  43 #define GIUIOSELL       0x00
  44 #define GIUIOSELH       0x02
  45 #define GIUPIODL        0x04
  46 #define GIUPIODH        0x06
  47 #define GIUINTSTATL     0x08
  48 #define GIUINTSTATH     0x0a
  49 #define GIUINTENL       0x0c
  50 #define GIUINTENH       0x0e
  51 #define GIUINTTYPL      0x10
  52 #define GIUINTTYPH      0x12
  53 #define GIUINTALSELL    0x14
  54 #define GIUINTALSELH    0x16
  55 #define GIUINTHTSELL    0x18
  56 #define GIUINTHTSELH    0x1a
  57 #define GIUPODATL       0x1c
  58 #define GIUPODATEN      0x1c
  59 #define GIUPODATH       0x1e
  60  #define PIOEN0         0x0100
  61  #define PIOEN1         0x0200
  62 #define GIUPODAT        0x1e
  63 #define GIUFEDGEINHL    0x20
  64 #define GIUFEDGEINHH    0x22
  65 #define GIUREDGEINHL    0x24
  66 #define GIUREDGEINHH    0x26
  67
  68 #define GIUUSEUPDN      0x1e0
  69 #define GIUTERMUPDN     0x1e2
  70
  71 #define GPIO_HAS_PULLUPDOWN_IO          0x0001
  72 #define GPIO_HAS_OUTPUT_ENABLE          0x0002
  73 #define GPIO_HAS_INTERRUPT_EDGE_SELECT  0x0100
  74
  75 enum {
  76         GPIO_INPUT,
  77         GPIO_OUTPUT,
  78 };
  79
  80 static DEFINE_SPINLOCK(giu_lock);
  81 static unsigned long giu_flags;
  82
  83 static void __iomem *giu_base;
  84
  85 #define giu_read(offset)                readw(giu_base + (offset))
  86 #define giu_write(offset, value)        writew((value), giu_base + (offset))
  87
  88 #define GPIO_PIN_OF_IRQ(irq)    ((irq) - GIU_IRQ_BASE)
  89 #define GIUINT_HIGH_OFFSET      16
  90 #define GIUINT_HIGH_MAX         32
  91
  92 static inline u16 giu_set(u16 offset, u16 set)
  93 {
  94         u16 data;
  95
  96         data = giu_read(offset);
  97         data |= set;
  98         giu_write(offset, data);
  99
 100         return data;
 101 }
 102
 103 static inline u16 giu_clear(u16 offset, u16 clear)
 104 {
 105         u16 data;
 106
 107         data = giu_read(offset);
 108         data &= ~clear;
 109         giu_write(offset, data);
 110
 111         return data;
 112 }
 113
 114 static void ack_giuint_low(struct irq_data *d)
 115 {
 116         giu_write(GIUINTSTATL, 1 << GPIO_PIN_OF_IRQ(d->irq));
 117 }
 118
 119 static void mask_giuint_low(struct irq_data *d)
 120 {
 121         giu_clear(GIUINTENL, 1 << GPIO_PIN_OF_IRQ(d->irq));
 122 }
 123
 124 static void mask_ack_giuint_low(struct irq_data *d)
 125 {
 126         unsigned int pin;
 127
 128         pin = GPIO_PIN_OF_IRQ(d->irq);
 129         giu_clear(GIUINTENL, 1 << pin);
 130         giu_write(GIUINTSTATL, 1 << pin);
 131 }
 132
 133 static void unmask_giuint_low(struct irq_data *d)
 134 {
 135         giu_set(GIUINTENL, 1 << GPIO_PIN_OF_IRQ(d->irq));
 136 }
 137
 138 static struct irq_chip giuint_low_irq_chip = {
 139         .name           = "GIUINTL",
 140         .irq_ack        = ack_giuint_low,
 141         .irq_mask       = mask_giuint_low,
 142         .irq_mask_ack   = mask_ack_giuint_low,
 143         .irq_unmask     = unmask_giuint_low,
 144 };
 145
 146 static void ack_giuint_high(struct irq_data *d)
 147 {
 148         giu_write(GIUINTSTATH,
 149                   1 << (GPIO_PIN_OF_IRQ(d->irq) - GIUINT_HIGH_OFFSET));
 150 }
 151
 152 static void mask_giuint_high(struct irq_data *d)
 153 {
 154         giu_clear(GIUINTENH, 1 << (GPIO_PIN_OF_IRQ(d->irq) - GIUINT_HIGH_OFFSET));
 155 }
 156
 157 static void mask_ack_giuint_high(struct irq_data *d)
 158 {
 159         unsigned int pin;
 160
 161         pin = GPIO_PIN_OF_IRQ(d->irq) - GIUINT_HIGH_OFFSET;
 162         giu_clear(GIUINTENH, 1 << pin);
 163         giu_write(GIUINTSTATH, 1 << pin);
 164 }
 165
 166 static void unmask_giuint_high(struct irq_data *d)
 167 {
 168         giu_set(GIUINTENH, 1 << (GPIO_PIN_OF_IRQ(d->irq) - GIUINT_HIGH_OFFSET));
 169 }
 170
 171 static struct irq_chip giuint_high_irq_chip = {
 172         .name           = "GIUINTH",
 173         .irq_ack        = ack_giuint_high,
 174         .irq_mask       = mask_giuint_high,
 175         .irq_mask_ack   = mask_ack_giuint_high,
 176         .irq_unmask     = unmask_giuint_high,
 177 };
 178
 179 static int giu_get_irq(unsigned int irq)
 180 {
 181         u16 pendl, pendh, maskl, maskh;
 182         int i;
 183
 184         pendl = giu_read(GIUINTSTATL);
 185         pendh = giu_read(GIUINTSTATH);
 186         maskl = giu_read(GIUINTENL);
 187         maskh = giu_read(GIUINTENH);
 188
 189         maskl &= pendl;
 190         maskh &= pendh;
 191
 192         if (maskl) {
 193                 for (i = 0; i < 16; i++) {
 194                         if (maskl & (1 << i))
 195                                 return GIU_IRQ(i);
 196                 }
 197         } else if (maskh) {
 198                 for (i = 0; i < 16; i++) {
 199                         if (maskh & (1 << i))
 200                                 return GIU_IRQ(i + GIUINT_HIGH_OFFSET);
 201                 }
 202         }
 203
 204         printk(KERN_ERR "spurious GIU interrupt: %04x(%04x),%04x(%04x)\n",
 205                maskl, pendl, maskh, pendh);
 206
 207         atomic_inc(&irq_err_count);
 208
 209         return -EINVAL;
 210 }
 211
 212 void vr41xx_set_irq_trigger(unsigned int pin, irq_trigger_t trigger,
 213                             irq_signal_t signal)
 214 {
 215         u16 mask;
 216
 217         if (pin < GIUINT_HIGH_OFFSET) {
 218                 mask = 1 << pin;
 219                 if (trigger != IRQ_TRIGGER_LEVEL) {
 220                         giu_set(GIUINTTYPL, mask);
 221                         if (signal == IRQ_SIGNAL_HOLD)
 222                                 giu_set(GIUINTHTSELL, mask);
 223                         else
 224                                 giu_clear(GIUINTHTSELL, mask);
 225                         if (giu_flags & GPIO_HAS_INTERRUPT_EDGE_SELECT) {
 226                                 switch (trigger) {
 227                                 case IRQ_TRIGGER_EDGE_FALLING:
 228                                         giu_set(GIUFEDGEINHL, mask);
 229                                         giu_clear(GIUREDGEINHL, mask);
 230                                         break;
 231                                 case IRQ_TRIGGER_EDGE_RISING:
 232                                         giu_clear(GIUFEDGEINHL, mask);
 233                                         giu_set(GIUREDGEINHL, mask);
 234                                         break;
 235                                 default:
 236                                         giu_set(GIUFEDGEINHL, mask);
 237                                         giu_set(GIUREDGEINHL, mask);
 238                                         break;
 239                                 }
 240                         }
 241                         irq_set_chip_and_handler(GIU_IRQ(pin),
 242                                                  &giuint_low_irq_chip,
 243                                                  handle_edge_irq);
 244                 } else {
 245                         giu_clear(GIUINTTYPL, mask);
 246                         giu_clear(GIUINTHTSELL, mask);
 247                         irq_set_chip_and_handler(GIU_IRQ(pin),
 248                                                  &giuint_low_irq_chip,
 249                                                  handle_level_irq);
 250                 }
 251                 giu_write(GIUINTSTATL, mask);
 252         } else if (pin < GIUINT_HIGH_MAX) {
 253                 mask = 1 << (pin - GIUINT_HIGH_OFFSET);
 254                 if (trigger != IRQ_TRIGGER_LEVEL) {
 255                         giu_set(GIUINTTYPH, mask);
 256                         if (signal == IRQ_SIGNAL_HOLD)
 257                                 giu_set(GIUINTHTSELH, mask);
 258                         else
 259                                 giu_clear(GIUINTHTSELH, mask);
 260                         if (giu_flags & GPIO_HAS_INTERRUPT_EDGE_SELECT) {
 261                                 switch (trigger) {
 262                                 case IRQ_TRIGGER_EDGE_FALLING:
 263                                         giu_set(GIUFEDGEINHH, mask);
 264                                         giu_clear(GIUREDGEINHH, mask);
 265                                         break;
 266                                 case IRQ_TRIGGER_EDGE_RISING:
 267                                         giu_clear(GIUFEDGEINHH, mask);
 268                                         giu_set(GIUREDGEINHH, mask);
 269                                         break;
 270                                 default:
 271                                         giu_set(GIUFEDGEINHH, mask);
 272                                         giu_set(GIUREDGEINHH, mask);
 273                                         break;
 274                                 }
 275                         }
 276                         irq_set_chip_and_handler(GIU_IRQ(pin),
 277                                                  &giuint_high_irq_chip,
 278                                                  handle_edge_irq);
 279                 } else {
 280                         giu_clear(GIUINTTYPH, mask);
 281                         giu_clear(GIUINTHTSELH, mask);
 282                         irq_set_chip_and_handler(GIU_IRQ(pin),
 283                                                  &giuint_high_irq_chip,
 284                                                  handle_level_irq);
 285                 }
 286                 giu_write(GIUINTSTATH, mask);
 287         }
 288 }
 289 EXPORT_SYMBOL_GPL(vr41xx_set_irq_trigger);
 290
 291 void vr41xx_set_irq_level(unsigned int pin, irq_level_t level)
 292 {
 293         u16 mask;
 294
 295         if (pin < GIUINT_HIGH_OFFSET) {
 296                 mask = 1 << pin;
 297                 if (level == IRQ_LEVEL_HIGH)
 298                         giu_set(GIUINTALSELL, mask);
 299                 else
 300                         giu_clear(GIUINTALSELL, mask);
 301                 giu_write(GIUINTSTATL, mask);
 302         } else if (pin < GIUINT_HIGH_MAX) {
 303                 mask = 1 << (pin - GIUINT_HIGH_OFFSET);
 304                 if (level == IRQ_LEVEL_HIGH)
 305                         giu_set(GIUINTALSELH, mask);
 306                 else
 307                         giu_clear(GIUINTALSELH, mask);
 308                 giu_write(GIUINTSTATH, mask);
 309         }
 310 }
 311 EXPORT_SYMBOL_GPL(vr41xx_set_irq_level);
 312
 313 static int giu_set_direction(struct gpio_chip *chip, unsigned pin, int dir)
 314 {
 315         u16 offset, mask, reg;
 316         unsigned long flags;
 317
 318         if (pin >= chip->ngpio)
 319                 return -EINVAL;
 320
 321         if (pin < 16) {
 322                 offset = GIUIOSELL;
 323                 mask = 1 << pin;
 324         } else if (pin < 32) {
 325                 offset = GIUIOSELH;
 326                 mask = 1 << (pin - 16);
 327         } else {
 328                 if (giu_flags & GPIO_HAS_OUTPUT_ENABLE) {
 329                         offset = GIUPODATEN;
 330                         mask = 1 << (pin - 32);
 331                 } else {
 332                         switch (pin) {
 333                         case 48:
 334                                 offset = GIUPODATH;
 335                                 mask = PIOEN0;
 336                                 break;
 337                         case 49:
 338                                 offset = GIUPODATH;
 339                                 mask = PIOEN1;
 340                                 break;
 341                         default:
 342                                 return -EINVAL;
 343                         }
 344                 }
 345         }
 346
 347         spin_lock_irqsave(&giu_lock, flags);
 348
 349         reg = giu_read(offset);
 350         if (dir == GPIO_OUTPUT)
 351                 reg |= mask;
 352         else
 353                 reg &= ~mask;
 354         giu_write(offset, reg);
 355
 356         spin_unlock_irqrestore(&giu_lock, flags);
 357
 358         return 0;
 359 }
 360
 361 int vr41xx_gpio_pullupdown(unsigned int pin, gpio_pull_t pull)
 362 {
 363         u16 reg, mask;
 364         unsigned long flags;
 365
 366         if ((giu_flags & GPIO_HAS_PULLUPDOWN_IO) != GPIO_HAS_PULLUPDOWN_IO)
 367                 return -EPERM;
 368
 369         if (pin >= 15)
 370                 return -EINVAL;
 371
 372         mask = 1 << pin;
 373
 374         spin_lock_irqsave(&giu_lock, flags);
 375
 376         if (pull == GPIO_PULL_UP || pull == GPIO_PULL_DOWN) {
 377                 reg = giu_read(GIUTERMUPDN);
 378                 if (pull == GPIO_PULL_UP)
 379                         reg |= mask;
 380                 else
 381                         reg &= ~mask;
 382                 giu_write(GIUTERMUPDN, reg);
 383
 384                 reg = giu_read(GIUUSEUPDN);
 385                 reg |= mask;
 386                 giu_write(GIUUSEUPDN, reg);
 387         } else {
 388                 reg = giu_read(GIUUSEUPDN);
 389                 reg &= ~mask;
 390                 giu_write(GIUUSEUPDN, reg);
 391         }
 392
 393         spin_unlock_irqrestore(&giu_lock, flags);
 394
 395         return 0;
 396 }
 397 EXPORT_SYMBOL_GPL(vr41xx_gpio_pullupdown);
 398
 399 static int vr41xx_gpio_get(struct gpio_chip *chip, unsigned pin)
 400 {
 401         u16 reg, mask;
 402
 403         if (pin >= chip->ngpio)
 404                 return -EINVAL;
 405
 406         if (pin < 16) {
 407                 reg = giu_read(GIUPIODL);
 408                 mask = 1 << pin;
 409         } else if (pin < 32) {
 410                 reg = giu_read(GIUPIODH);
 411                 mask = 1 << (pin - 16);
 412         } else if (pin < 48) {
 413                 reg = giu_read(GIUPODATL);
 414                 mask = 1 << (pin - 32);
 415         } else {
 416                 reg = giu_read(GIUPODATH);
 417                 mask = 1 << (pin - 48);
 418         }
 419
 420         if (reg & mask)
 421                 return 1;
 422
 423         return 0;
 424 }
 425
 426 static void vr41xx_gpio_set(struct gpio_chip *chip, unsigned pin,
 427                             int value)
 428 {
 429         u16 offset, mask, reg;
 430         unsigned long flags;
 431
 432         if (pin >= chip->ngpio)
 433                 return;
 434
 435         if (pin < 16) {
 436                 offset = GIUPIODL;
 437                 mask = 1 << pin;
 438         } else if (pin < 32) {
 439                 offset = GIUPIODH;
 440                 mask = 1 << (pin - 16);
 441         } else if (pin < 48) {
 442                 offset = GIUPODATL;
 443                 mask = 1 << (pin - 32);
 444         } else {
 445                 offset = GIUPODATH;
 446                 mask = 1 << (pin - 48);
 447         }
 448
 449         spin_lock_irqsave(&giu_lock, flags);
 450
 451         reg = giu_read(offset);
 452         if (value)
 453                 reg |= mask;
 454         else
 455                 reg &= ~mask;
 456         giu_write(offset, reg);
 457
 458         spin_unlock_irqrestore(&giu_lock, flags);
 459 }
 460
 461
 462 static int vr41xx_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
 463 {
 464         return giu_set_direction(chip, offset, GPIO_INPUT);
 465 }
 466
 467 static int vr41xx_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
 468                                 int value)
 469 {
 470         vr41xx_gpio_set(chip, offset, value);
 471
 472         return giu_set_direction(chip, offset, GPIO_OUTPUT);
 473 }
 474
 475 static int vr41xx_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
 476 {
 477         if (offset >= chip->ngpio)
 478                 return -EINVAL;
 479
 480         return GIU_IRQ_BASE + offset;
 481 }
 482
 483 static struct gpio_chip vr41xx_gpio_chip = {
 484         .label                  = "vr41xx",
 485         .owner                  = THIS_MODULE,
 486         .direction_input        = vr41xx_gpio_direction_input,
 487         .get                    = vr41xx_gpio_get,
 488         .direction_output       = vr41xx_gpio_direction_output,
 489         .set                    = vr41xx_gpio_set,
 490         .to_irq                 = vr41xx_gpio_to_irq,
 491 };
 492
 493 static int giu_probe(struct platform_device *pdev)
 494 {
 495         struct resource *res;
 496         unsigned int trigger, i, pin;
 497         struct irq_chip *chip;
 498         int irq, retval;
 499
 500         switch (pdev->id) {
 501         case GPIO_50PINS_PULLUPDOWN:
 502                 giu_flags = GPIO_HAS_PULLUPDOWN_IO;
 503                 vr41xx_gpio_chip.ngpio = 50;
 504                 break;
 505         case GPIO_36PINS:
 506                 vr41xx_gpio_chip.ngpio = 36;
 507                 break;
 508         case GPIO_48PINS_EDGE_SELECT:
 509                 giu_flags = GPIO_HAS_INTERRUPT_EDGE_SELECT;
 510                 vr41xx_gpio_chip.ngpio = 48;
 511                 break;
 512         default:
 513                 dev_err(&pdev->dev, "GIU: unknown ID %d\n", pdev->id);
 514                 return -ENODEV;
 515         }
 516
 517         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 518         if (!res)
 519                 return -EBUSY;
 520
 521         giu_base = ioremap(res->start, resource_size(res));
 522         if (!giu_base)
 523                 return -ENOMEM;
 524
 525         vr41xx_gpio_chip.dev = &pdev->dev;
 526
 527         retval = gpiochip_add(&vr41xx_gpio_chip);
 528
 529         giu_write(GIUINTENL, 0);
 530         giu_write(GIUINTENH, 0);
 531
 532         trigger = giu_read(GIUINTTYPH) << 16;
 533         trigger |= giu_read(GIUINTTYPL);
 534         for (i = GIU_IRQ_BASE; i <= GIU_IRQ_LAST; i++) {
 535                 pin = GPIO_PIN_OF_IRQ(i);
 536                 if (pin < GIUINT_HIGH_OFFSET)
 537                         chip = &giuint_low_irq_chip;
 538                 else
 539                         chip = &giuint_high_irq_chip;
 540
 541                 if (trigger & (1 << pin))
 542                         irq_set_chip_and_handler(i, chip, handle_edge_irq);
 543                 else
 544                         irq_set_chip_and_handler(i, chip, handle_level_irq);
 545
 546         }
 547
 548         irq = platform_get_irq(pdev, 0);
 549         if (irq < 0 || irq >= nr_irqs)
 550                 return -EBUSY;
 551
 552         return cascade_irq(irq, giu_get_irq);
 553 }
 554
 555 static int giu_remove(struct platform_device *pdev)
 556 {
 557         if (giu_base) {
 558                 iounmap(giu_base);
 559                 giu_base = NULL;
 560         }
 561
 562         return 0;
 563 }
 564
 565 static struct platform_driver giu_device_driver = {
 566         .probe          = giu_probe,
 567         .remove         = giu_remove,
 568         .driver         = {
 569                 .name   = "GIU",
 570                 .owner  = THIS_MODULE,
 571         },
 572 };
 573
 574 module_platform_driver(giu_device_driver);