drivers/mfd/ab8500-core.c

   1 /*
   2  * Copyright (C) ST-Ericsson SA 2010
   3  *
   4  * License Terms: GNU General Public License v2
   5  * Author: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
   6  * Author: Rabin Vincent <rabin.vincent@stericsson.com>
   7  * Changes: Mattias Wallin <mattias.wallin@stericsson.com>
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/slab.h>
  12 #include <linux/init.h>
  13 #include <linux/irq.h>
  14 #include <linux/delay.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/module.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/mfd/core.h>
  19 #include <linux/mfd/abx500.h>
  20 #include <linux/mfd/ab8500.h>
  21 #include <linux/regulator/ab8500.h>
  22
  23 /*
  24  * Interrupt register offsets
  25  * Bank : 0x0E
  26  */
  27 #define AB8500_IT_SOURCE1_REG           0x00
  28 #define AB8500_IT_SOURCE2_REG           0x01
  29 #define AB8500_IT_SOURCE3_REG           0x02
  30 #define AB8500_IT_SOURCE4_REG           0x03
  31 #define AB8500_IT_SOURCE5_REG           0x04
  32 #define AB8500_IT_SOURCE6_REG           0x05
  33 #define AB8500_IT_SOURCE7_REG           0x06
  34 #define AB8500_IT_SOURCE8_REG           0x07
  35 #define AB8500_IT_SOURCE19_REG          0x12
  36 #define AB8500_IT_SOURCE20_REG          0x13
  37 #define AB8500_IT_SOURCE21_REG          0x14
  38 #define AB8500_IT_SOURCE22_REG          0x15
  39 #define AB8500_IT_SOURCE23_REG          0x16
  40 #define AB8500_IT_SOURCE24_REG          0x17
  41
  42 /*
  43  * latch registers
  44  */
  45 #define AB8500_IT_LATCH1_REG            0x20
  46 #define AB8500_IT_LATCH2_REG            0x21
  47 #define AB8500_IT_LATCH3_REG            0x22
  48 #define AB8500_IT_LATCH4_REG            0x23
  49 #define AB8500_IT_LATCH5_REG            0x24
  50 #define AB8500_IT_LATCH6_REG            0x25
  51 #define AB8500_IT_LATCH7_REG            0x26
  52 #define AB8500_IT_LATCH8_REG            0x27
  53 #define AB8500_IT_LATCH9_REG            0x28
  54 #define AB8500_IT_LATCH10_REG           0x29
  55 #define AB8500_IT_LATCH19_REG           0x32
  56 #define AB8500_IT_LATCH20_REG           0x33
  57 #define AB8500_IT_LATCH21_REG           0x34
  58 #define AB8500_IT_LATCH22_REG           0x35
  59 #define AB8500_IT_LATCH23_REG           0x36
  60 #define AB8500_IT_LATCH24_REG           0x37
  61
  62 /*
  63  * mask registers
  64  */
  65
  66 #define AB8500_IT_MASK1_REG             0x40
  67 #define AB8500_IT_MASK2_REG             0x41
  68 #define AB8500_IT_MASK3_REG             0x42
  69 #define AB8500_IT_MASK4_REG             0x43
  70 #define AB8500_IT_MASK5_REG             0x44
  71 #define AB8500_IT_MASK6_REG             0x45
  72 #define AB8500_IT_MASK7_REG             0x46
  73 #define AB8500_IT_MASK8_REG             0x47
  74 #define AB8500_IT_MASK9_REG             0x48
  75 #define AB8500_IT_MASK10_REG            0x49
  76 #define AB8500_IT_MASK11_REG            0x4A
  77 #define AB8500_IT_MASK12_REG            0x4B
  78 #define AB8500_IT_MASK13_REG            0x4C
  79 #define AB8500_IT_MASK14_REG            0x4D
  80 #define AB8500_IT_MASK15_REG            0x4E
  81 #define AB8500_IT_MASK16_REG            0x4F
  82 #define AB8500_IT_MASK17_REG            0x50
  83 #define AB8500_IT_MASK18_REG            0x51
  84 #define AB8500_IT_MASK19_REG            0x52
  85 #define AB8500_IT_MASK20_REG            0x53
  86 #define AB8500_IT_MASK21_REG            0x54
  87 #define AB8500_IT_MASK22_REG            0x55
  88 #define AB8500_IT_MASK23_REG            0x56
  89 #define AB8500_IT_MASK24_REG            0x57
  90
  91 #define AB8500_REV_REG                  0x80
  92
  93 /*
  94  * Map interrupt numbers to the LATCH and MASK register offsets, Interrupt
  95  * numbers are indexed into this array with (num / 8).
  96  *
  97  * This is one off from the register names, i.e. AB8500_IT_MASK1_REG is at
  98  * offset 0.
  99  */
 100 static const int ab8500_irq_regoffset[AB8500_NUM_IRQ_REGS] = {
 101         0, 1, 2, 3, 4, 6, 7, 8, 9, 18, 19, 20, 21,
 102 };
 103
 104 static int ab8500_get_chip_id(struct device *dev)
 105 {
 106         struct ab8500 *ab8500 = dev_get_drvdata(dev->parent);
 107         return (int)ab8500->chip_id;
 108 }
 109
 110 static int set_register_interruptible(struct ab8500 *ab8500, u8 bank,
 111         u8 reg, u8 data)
 112 {
 113         int ret;
 114         /*
 115          * Put the u8 bank and u8 register together into a an u16.
 116          * The bank on higher 8 bits and register in lower 8 bits.
 117          * */
 118         u16 addr = ((u16)bank) << 8 | reg;
 119
 120         dev_vdbg(ab8500->dev, "wr: addr %#x <= %#x\n", addr, data);
 121
 122         ret = mutex_lock_interruptible(&ab8500->lock);
 123         if (ret)
 124                 return ret;
 125
 126         ret = ab8500->write(ab8500, addr, data);
 127         if (ret < 0)
 128                 dev_err(ab8500->dev, "failed to write reg %#x: %d\n",
 129                         addr, ret);
 130         mutex_unlock(&ab8500->lock);
 131
 132         return ret;
 133 }
 134
 135 static int ab8500_set_register(struct device *dev, u8 bank,
 136         u8 reg, u8 value)
 137 {
 138         struct ab8500 *ab8500 = dev_get_drvdata(dev->parent);
 139
 140         return set_register_interruptible(ab8500, bank, reg, value);
 141 }
 142
 143 static int get_register_interruptible(struct ab8500 *ab8500, u8 bank,
 144         u8 reg, u8 *value)
 145 {
 146         int ret;
 147         /* put the u8 bank and u8 reg together into a an u16.
 148          * bank on higher 8 bits and reg in lower */
 149         u16 addr = ((u16)bank) << 8 | reg;
 150
 151         ret = mutex_lock_interruptible(&ab8500->lock);
 152         if (ret)
 153                 return ret;
 154
 155         ret = ab8500->read(ab8500, addr);
 156         if (ret < 0)
 157                 dev_err(ab8500->dev, "failed to read reg %#x: %d\n",
 158                         addr, ret);
 159         else
 160                 *value = ret;
 161
 162         mutex_unlock(&ab8500->lock);
 163         dev_vdbg(ab8500->dev, "rd: addr %#x => data %#x\n", addr, ret);
 164
 165         return ret;
 166 }
 167
 168 static int ab8500_get_register(struct device *dev, u8 bank,
 169         u8 reg, u8 *value)
 170 {
 171         struct ab8500 *ab8500 = dev_get_drvdata(dev->parent);
 172
 173         return get_register_interruptible(ab8500, bank, reg, value);
 174 }
 175
 176 static int mask_and_set_register_interruptible(struct ab8500 *ab8500, u8 bank,
 177         u8 reg, u8 bitmask, u8 bitvalues)
 178 {
 179         int ret;
 180         u8 data;
 181         /* put the u8 bank and u8 reg together into a an u16.
 182          * bank on higher 8 bits and reg in lower */
 183         u16 addr = ((u16)bank) << 8 | reg;
 184
 185         ret = mutex_lock_interruptible(&ab8500->lock);
 186         if (ret)
 187                 return ret;
 188
 189         ret = ab8500->read(ab8500, addr);
 190         if (ret < 0) {
 191                 dev_err(ab8500->dev, "failed to read reg %#x: %d\n",
 192                         addr, ret);
 193                 goto out;
 194         }
 195
 196         data = (u8)ret;
 197         data = (~bitmask & data) | (bitmask & bitvalues);
 198
 199         ret = ab8500->write(ab8500, addr, data);
 200         if (ret < 0)
 201                 dev_err(ab8500->dev, "failed to write reg %#x: %d\n",
 202                         addr, ret);
 203
 204         dev_vdbg(ab8500->dev, "mask: addr %#x => data %#x\n", addr, data);
 205 out:
 206         mutex_unlock(&ab8500->lock);
 207         return ret;
 208 }
 209
 210 static int ab8500_mask_and_set_register(struct device *dev,
 211         u8 bank, u8 reg, u8 bitmask, u8 bitvalues)
 212 {
 213         struct ab8500 *ab8500 = dev_get_drvdata(dev->parent);
 214
 215         return mask_and_set_register_interruptible(ab8500, bank, reg,
 216                 bitmask, bitvalues);
 217
 218 }
 219
 220 static struct abx500_ops ab8500_ops = {
 221         .get_chip_id = ab8500_get_chip_id,
 222         .get_register = ab8500_get_register,
 223         .set_register = ab8500_set_register,
 224         .get_register_page = NULL,
 225         .set_register_page = NULL,
 226         .mask_and_set_register = ab8500_mask_and_set_register,
 227         .event_registers_startup_state_get = NULL,
 228         .startup_irq_enabled = NULL,
 229 };
 230
 231 static void ab8500_irq_lock(unsigned int irq)
 232 {
 233         struct ab8500 *ab8500 = get_irq_chip_data(irq);
 234
 235         mutex_lock(&ab8500->irq_lock);
 236 }
 237
 238 static void ab8500_irq_sync_unlock(unsigned int irq)
 239 {
 240         struct ab8500 *ab8500 = get_irq_chip_data(irq);
 241         int i;
 242
 243         for (i = 0; i < AB8500_NUM_IRQ_REGS; i++) {
 244                 u8 old = ab8500->oldmask[i];
 245                 u8 new = ab8500->mask[i];
 246                 int reg;
 247
 248                 if (new == old)
 249                         continue;
 250
 251                 ab8500->oldmask[i] = new;
 252
 253                 reg = AB8500_IT_MASK1_REG + ab8500_irq_regoffset[i];
 254                 set_register_interruptible(ab8500, AB8500_INTERRUPT, reg, new);
 255         }
 256
 257         mutex_unlock(&ab8500->irq_lock);
 258 }
 259
 260 static void ab8500_irq_mask(unsigned int irq)
 261 {
 262         struct ab8500 *ab8500 = get_irq_chip_data(irq);
 263         int offset = irq - ab8500->irq_base;
 264         int index = offset / 8;
 265         int mask = 1 << (offset % 8);
 266
 267         ab8500->mask[index] |= mask;
 268 }
 269
 270 static void ab8500_irq_unmask(unsigned int irq)
 271 {
 272         struct ab8500 *ab8500 = get_irq_chip_data(irq);
 273         int offset = irq - ab8500->irq_base;
 274         int index = offset / 8;
 275         int mask = 1 << (offset % 8);
 276
 277         ab8500->mask[index] &= ~mask;
 278 }
 279
 280 static struct irq_chip ab8500_irq_chip = {
 281         .name                   = "ab8500",
 282         .bus_lock               = ab8500_irq_lock,
 283         .bus_sync_unlock        = ab8500_irq_sync_unlock,
 284         .mask                   = ab8500_irq_mask,
 285         .unmask                 = ab8500_irq_unmask,
 286 };
 287
 288 static irqreturn_t ab8500_irq(int irq, void *dev)
 289 {
 290         struct ab8500 *ab8500 = dev;
 291         int i;
 292
 293         dev_vdbg(ab8500->dev, "interrupt\n");
 294
 295         for (i = 0; i < AB8500_NUM_IRQ_REGS; i++) {
 296                 int regoffset = ab8500_irq_regoffset[i];
 297                 int status;
 298                 u8 value;
 299
 300                 status = get_register_interruptible(ab8500, AB8500_INTERRUPT,
 301                         AB8500_IT_LATCH1_REG + regoffset, &value);
 302                 if (status < 0 || value == 0)
 303                         continue;
 304
 305                 do {
 306                         int bit = __ffs(value);
 307                         int line = i * 8 + bit;
 308
 309                         handle_nested_irq(ab8500->irq_base + line);
 310                         value &= ~(1 << bit);
 311                 } while (value);
 312         }
 313
 314         return IRQ_HANDLED;
 315 }
 316
 317 static int ab8500_irq_init(struct ab8500 *ab8500)
 318 {
 319         int base = ab8500->irq_base;
 320         int irq;
 321
 322         for (irq = base; irq < base + AB8500_NR_IRQS; irq++) {
 323                 set_irq_chip_data(irq, ab8500);
 324                 set_irq_chip_and_handler(irq, &ab8500_irq_chip,
 325                                          handle_simple_irq);
 326                 set_irq_nested_thread(irq, 1);
 327 #ifdef CONFIG_ARM
 328                 set_irq_flags(irq, IRQF_VALID);
 329 #else
 330                 set_irq_noprobe(irq);
 331 #endif
 332         }
 333
 334         return 0;
 335 }
 336
 337 static void ab8500_irq_remove(struct ab8500 *ab8500)
 338 {
 339         int base = ab8500->irq_base;
 340         int irq;
 341
 342         for (irq = base; irq < base + AB8500_NR_IRQS; irq++) {
 343 #ifdef CONFIG_ARM
 344                 set_irq_flags(irq, 0);
 345 #endif
 346                 set_irq_chip_and_handler(irq, NULL, NULL);
 347                 set_irq_chip_data(irq, NULL);
 348         }
 349 }
 350
 351 static struct resource ab8500_gpadc_resources[] = {
 352         {
 353                 .name   = "HW_CONV_END",
 354                 .start  = AB8500_INT_GP_HW_ADC_CONV_END,
 355                 .end    = AB8500_INT_GP_HW_ADC_CONV_END,
 356                 .flags  = IORESOURCE_IRQ,
 357         },
 358         {
 359                 .name   = "SW_CONV_END",
 360                 .start  = AB8500_INT_GP_SW_ADC_CONV_END,
 361                 .end    = AB8500_INT_GP_SW_ADC_CONV_END,
 362                 .flags  = IORESOURCE_IRQ,
 363         },
 364 };
 365
 366 static struct resource ab8500_rtc_resources[] = {
 367         {
 368                 .name   = "60S",
 369                 .start  = AB8500_INT_RTC_60S,
 370                 .end    = AB8500_INT_RTC_60S,
 371                 .flags  = IORESOURCE_IRQ,
 372         },
 373         {
 374                 .name   = "ALARM",
 375                 .start  = AB8500_INT_RTC_ALARM,
 376                 .end    = AB8500_INT_RTC_ALARM,
 377                 .flags  = IORESOURCE_IRQ,
 378         },
 379 };
 380
 381 static struct resource ab8500_poweronkey_db_resources[] = {
 382         {
 383                 .name   = "ONKEY_DBF",
 384                 .start  = AB8500_INT_PON_KEY1DB_F,
 385                 .end    = AB8500_INT_PON_KEY1DB_F,
 386                 .flags  = IORESOURCE_IRQ,
 387         },
 388         {
 389                 .name   = "ONKEY_DBR",
 390                 .start  = AB8500_INT_PON_KEY1DB_R,
 391                 .end    = AB8500_INT_PON_KEY1DB_R,
 392                 .flags  = IORESOURCE_IRQ,
 393         },
 394 };
 395
 396 static struct mfd_cell ab8500_devs[] = {
 397 #ifdef CONFIG_DEBUG_FS
 398         {
 399                 .name = "ab8500-debug",
 400         },
 401 #endif
 402         {
 403                 .name = "ab8500-gpadc",
 404                 .num_resources = ARRAY_SIZE(ab8500_gpadc_resources),
 405                 .resources = ab8500_gpadc_resources,
 406         },
 407         {
 408                 .name = "ab8500-rtc",
 409                 .num_resources = ARRAY_SIZE(ab8500_rtc_resources),
 410                 .resources = ab8500_rtc_resources,
 411         },
 412         {
 413                 .name = "ab8500-pwm",
 414                 .id = 1,
 415         },
 416         {
 417                 .name = "ab8500-pwm",
 418                 .id = 2,
 419         },
 420         {
 421                 .name = "ab8500-pwm",
 422                 .id = 3,
 423         },
 424         { .name = "ab8500-charger", },
 425         { .name = "ab8500-audio", },
 426         { .name = "ab8500-usb", },
 427         { .name = "ab8500-regulator", },
 428         {
 429                 .name = "ab8500-poweron-key",
 430                 .num_resources = ARRAY_SIZE(ab8500_poweronkey_db_resources),
 431                 .resources = ab8500_poweronkey_db_resources,
 432         },
 433 };
 434
 435 int __devinit ab8500_init(struct ab8500 *ab8500)
 436 {
 437         struct ab8500_platform_data *plat = dev_get_platdata(ab8500->dev);
 438         int ret;
 439         int i;
 440         u8 value;
 441
 442         if (plat)
 443                 ab8500->irq_base = plat->irq_base;
 444
 445         mutex_init(&ab8500->lock);
 446         mutex_init(&ab8500->irq_lock);
 447
 448         ret = get_register_interruptible(ab8500, AB8500_MISC,
 449                 AB8500_REV_REG, &value);
 450         if (ret < 0)
 451                 return ret;
 452
 453         /*
 454          * 0x0 - Early Drop
 455          * 0x10 - Cut 1.0
 456          * 0x11 - Cut 1.1
 457          */
 458         if (value == 0x0 || value == 0x10 || value == 0x11) {
 459                 ab8500->revision = value;
 460                 dev_info(ab8500->dev, "detected chip, revision: %#x\n", value);
 461         } else {
 462                 dev_err(ab8500->dev, "unknown chip, revision: %#x\n", value);
 463                 return -EINVAL;
 464         }
 465         ab8500->chip_id = value;
 466
 467         if (plat && plat->init)
 468                 plat->init(ab8500);
 469
 470         /* Clear and mask all interrupts */
 471         for (i = 0; i < 10; i++) {
 472                 get_register_interruptible(ab8500, AB8500_INTERRUPT,
 473                         AB8500_IT_LATCH1_REG + i, &value);
 474                 set_register_interruptible(ab8500, AB8500_INTERRUPT,
 475                         AB8500_IT_MASK1_REG + i, 0xff);
 476         }
 477
 478         for (i = 18; i < 24; i++) {
 479                 get_register_interruptible(ab8500, AB8500_INTERRUPT,
 480                         AB8500_IT_LATCH1_REG + i, &value);
 481                 set_register_interruptible(ab8500, AB8500_INTERRUPT,
 482                         AB8500_IT_MASK1_REG + i, 0xff);
 483         }
 484
 485         ret = abx500_register_ops(ab8500->dev, &ab8500_ops);
 486         if (ret)
 487                 return ret;
 488
 489         for (i = 0; i < AB8500_NUM_IRQ_REGS; i++)
 490                 ab8500->mask[i] = ab8500->oldmask[i] = 0xff;
 491
 492         if (ab8500->irq_base) {
 493                 ret = ab8500_irq_init(ab8500);
 494                 if (ret)
 495                         return ret;
 496
 497                 ret = request_threaded_irq(ab8500->irq, NULL, ab8500_irq,
 498                                            IRQF_ONESHOT, "ab8500", ab8500);
 499                 if (ret)
 500                         goto out_removeirq;
 501         }
 502
 503         ret = mfd_add_devices(ab8500->dev, 0, ab8500_devs,
 504                               ARRAY_SIZE(ab8500_devs), NULL,
 505                               ab8500->irq_base);
 506         if (ret)
 507                 goto out_freeirq;
 508
 509         return ret;
 510
 511 out_freeirq:
 512         if (ab8500->irq_base) {
 513                 free_irq(ab8500->irq, ab8500);
 514 out_removeirq:
 515                 ab8500_irq_remove(ab8500);
 516         }
 517         return ret;
 518 }
 519
 520 int __devexit ab8500_exit(struct ab8500 *ab8500)
 521 {
 522         mfd_remove_devices(ab8500->dev);
 523         if (ab8500->irq_base) {
 524                 free_irq(ab8500->irq, ab8500);
 525                 ab8500_irq_remove(ab8500);
 526         }
 527
 528         return 0;
 529 }
 530
 531 MODULE_AUTHOR("Srinidhi Kasagar, Rabin Vincent");
 532 MODULE_DESCRIPTION("AB8500 MFD core");
 533 MODULE_LICENSE("GPL v2");