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  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/slab.h>
  11 #include <linux/init.h>
  12 #include <linux/irq.h>
  13 #include <linux/delay.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/module.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/mfd/core.h>
  18 #include <linux/mfd/ab8500.h>
  19 #include <linux/regulator/ab8500.h>
  20
  21 /*
  22  * Interrupt register offsets
  23  * Bank : 0x0E
  24  */
  25 #define AB8500_IT_SOURCE1_REG           0x0E00
  26 #define AB8500_IT_SOURCE2_REG           0x0E01
  27 #define AB8500_IT_SOURCE3_REG           0x0E02
  28 #define AB8500_IT_SOURCE4_REG           0x0E03
  29 #define AB8500_IT_SOURCE5_REG           0x0E04
  30 #define AB8500_IT_SOURCE6_REG           0x0E05
  31 #define AB8500_IT_SOURCE7_REG           0x0E06
  32 #define AB8500_IT_SOURCE8_REG           0x0E07
  33 #define AB8500_IT_SOURCE19_REG          0x0E12
  34 #define AB8500_IT_SOURCE20_REG          0x0E13
  35 #define AB8500_IT_SOURCE21_REG          0x0E14
  36 #define AB8500_IT_SOURCE22_REG          0x0E15
  37 #define AB8500_IT_SOURCE23_REG          0x0E16
  38 #define AB8500_IT_SOURCE24_REG          0x0E17
  39
  40 /*
  41  * latch registers
  42  */
  43 #define AB8500_IT_LATCH1_REG            0x0E20
  44 #define AB8500_IT_LATCH2_REG            0x0E21
  45 #define AB8500_IT_LATCH3_REG            0x0E22
  46 #define AB8500_IT_LATCH4_REG            0x0E23
  47 #define AB8500_IT_LATCH5_REG            0x0E24
  48 #define AB8500_IT_LATCH6_REG            0x0E25
  49 #define AB8500_IT_LATCH7_REG            0x0E26
  50 #define AB8500_IT_LATCH8_REG            0x0E27
  51 #define AB8500_IT_LATCH9_REG            0x0E28
  52 #define AB8500_IT_LATCH10_REG           0x0E29
  53 #define AB8500_IT_LATCH19_REG           0x0E32
  54 #define AB8500_IT_LATCH20_REG           0x0E33
  55 #define AB8500_IT_LATCH21_REG           0x0E34
  56 #define AB8500_IT_LATCH22_REG           0x0E35
  57 #define AB8500_IT_LATCH23_REG           0x0E36
  58 #define AB8500_IT_LATCH24_REG           0x0E37
  59
  60 /*
  61  * mask registers
  62  */
  63
  64 #define AB8500_IT_MASK1_REG             0x0E40
  65 #define AB8500_IT_MASK2_REG             0x0E41
  66 #define AB8500_IT_MASK3_REG             0x0E42
  67 #define AB8500_IT_MASK4_REG             0x0E43
  68 #define AB8500_IT_MASK5_REG             0x0E44
  69 #define AB8500_IT_MASK6_REG             0x0E45
  70 #define AB8500_IT_MASK7_REG             0x0E46
  71 #define AB8500_IT_MASK8_REG             0x0E47
  72 #define AB8500_IT_MASK9_REG             0x0E48
  73 #define AB8500_IT_MASK10_REG            0x0E49
  74 #define AB8500_IT_MASK11_REG            0x0E4A
  75 #define AB8500_IT_MASK12_REG            0x0E4B
  76 #define AB8500_IT_MASK13_REG            0x0E4C
  77 #define AB8500_IT_MASK14_REG            0x0E4D
  78 #define AB8500_IT_MASK15_REG            0x0E4E
  79 #define AB8500_IT_MASK16_REG            0x0E4F
  80 #define AB8500_IT_MASK17_REG            0x0E50
  81 #define AB8500_IT_MASK18_REG            0x0E51
  82 #define AB8500_IT_MASK19_REG            0x0E52
  83 #define AB8500_IT_MASK20_REG            0x0E53
  84 #define AB8500_IT_MASK21_REG            0x0E54
  85 #define AB8500_IT_MASK22_REG            0x0E55
  86 #define AB8500_IT_MASK23_REG            0x0E56
  87 #define AB8500_IT_MASK24_REG            0x0E57
  88
  89 #define AB8500_REV_REG                  0x1080
  90
  91 /*
  92  * Map interrupt numbers to the LATCH and MASK register offsets, Interrupt
  93  * numbers are indexed into this array with (num / 8).
  94  *
  95  * This is one off from the register names, i.e. AB8500_IT_MASK1_REG is at
  96  * offset 0.
  97  */
  98 static const int ab8500_irq_regoffset[AB8500_NUM_IRQ_REGS] = {
  99         0, 1, 2, 3, 4, 6, 7, 8, 9, 18, 19, 20, 21,
 100 };
 101
 102 static int __ab8500_write(struct ab8500 *ab8500, u16 addr, u8 data)
 103 {
 104         int ret;
 105
 106         dev_vdbg(ab8500->dev, "wr: addr %#x <= %#x\n", addr, data);
 107
 108         ret = ab8500->write(ab8500, addr, data);
 109         if (ret < 0)
 110                 dev_err(ab8500->dev, "failed to write reg %#x: %d\n",
 111                         addr, ret);
 112
 113         return ret;
 114 }
 115
 116 /**
 117  * ab8500_write() - write an AB8500 register
 118  * @ab8500: device to write to
 119  * @addr: address of the register
 120  * @data: value to write
 121  */
 122 int ab8500_write(struct ab8500 *ab8500, u16 addr, u8 data)
 123 {
 124         int ret;
 125
 126         mutex_lock(&ab8500->lock);
 127         ret = __ab8500_write(ab8500, addr, data);
 128         mutex_unlock(&ab8500->lock);
 129
 130         return ret;
 131 }
 132 EXPORT_SYMBOL_GPL(ab8500_write);
 133
 134 static int __ab8500_read(struct ab8500 *ab8500, u16 addr)
 135 {
 136         int ret;
 137
 138         ret = ab8500->read(ab8500, addr);
 139         if (ret < 0)
 140                 dev_err(ab8500->dev, "failed to read reg %#x: %d\n",
 141                         addr, ret);
 142
 143         dev_vdbg(ab8500->dev, "rd: addr %#x => data %#x\n", addr, ret);
 144
 145         return ret;
 146 }
 147
 148 /**
 149  * ab8500_read() - read an AB8500 register
 150  * @ab8500: device to read from
 151  * @addr: address of the register
 152  */
 153 int ab8500_read(struct ab8500 *ab8500, u16 addr)
 154 {
 155         int ret;
 156
 157         mutex_lock(&ab8500->lock);
 158         ret = __ab8500_read(ab8500, addr);
 159         mutex_unlock(&ab8500->lock);
 160
 161         return ret;
 162 }
 163 EXPORT_SYMBOL_GPL(ab8500_read);
 164
 165 /**
 166  * ab8500_set_bits() - set a bitfield in an AB8500 register
 167  * @ab8500: device to read from
 168  * @addr: address of the register
 169  * @mask: mask of the bitfield to modify
 170  * @data: value to set to the bitfield
 171  */
 172 int ab8500_set_bits(struct ab8500 *ab8500, u16 addr, u8 mask, u8 data)
 173 {
 174         int ret;
 175
 176         mutex_lock(&ab8500->lock);
 177
 178         ret = __ab8500_read(ab8500, addr);
 179         if (ret < 0)
 180                 goto out;
 181
 182         ret &= ~mask;
 183         ret |= data;
 184
 185         ret = __ab8500_write(ab8500, addr, ret);
 186
 187 out:
 188         mutex_unlock(&ab8500->lock);
 189         return ret;
 190 }
 191 EXPORT_SYMBOL_GPL(ab8500_set_bits);
 192
 193 static void ab8500_irq_lock(unsigned int irq)
 194 {
 195         struct ab8500 *ab8500 = get_irq_chip_data(irq);
 196
 197         mutex_lock(&ab8500->irq_lock);
 198 }
 199
 200 static void ab8500_irq_sync_unlock(unsigned int irq)
 201 {
 202         struct ab8500 *ab8500 = get_irq_chip_data(irq);
 203         int i;
 204
 205         for (i = 0; i < AB8500_NUM_IRQ_REGS; i++) {
 206                 u8 old = ab8500->oldmask[i];
 207                 u8 new = ab8500->mask[i];
 208                 int reg;
 209
 210                 if (new == old)
 211                         continue;
 212
 213                 ab8500->oldmask[i] = new;
 214
 215                 reg = AB8500_IT_MASK1_REG + ab8500_irq_regoffset[i];
 216                 ab8500_write(ab8500, reg, new);
 217         }
 218
 219         mutex_unlock(&ab8500->irq_lock);
 220 }
 221
 222 static void ab8500_irq_mask(unsigned int irq)
 223 {
 224         struct ab8500 *ab8500 = get_irq_chip_data(irq);
 225         int offset = irq - ab8500->irq_base;
 226         int index = offset / 8;
 227         int mask = 1 << (offset % 8);
 228
 229         ab8500->mask[index] |= mask;
 230 }
 231
 232 static void ab8500_irq_unmask(unsigned int irq)
 233 {
 234         struct ab8500 *ab8500 = get_irq_chip_data(irq);
 235         int offset = irq - ab8500->irq_base;
 236         int index = offset / 8;
 237         int mask = 1 << (offset % 8);
 238
 239         ab8500->mask[index] &= ~mask;
 240 }
 241
 242 static struct irq_chip ab8500_irq_chip = {
 243         .name                   = "ab8500",
 244         .bus_lock               = ab8500_irq_lock,
 245         .bus_sync_unlock        = ab8500_irq_sync_unlock,
 246         .mask                   = ab8500_irq_mask,
 247         .unmask                 = ab8500_irq_unmask,
 248 };
 249
 250 static irqreturn_t ab8500_irq(int irq, void *dev)
 251 {
 252         struct ab8500 *ab8500 = dev;
 253         int i;
 254
 255         dev_vdbg(ab8500->dev, "interrupt\n");
 256
 257         for (i = 0; i < AB8500_NUM_IRQ_REGS; i++) {
 258                 int regoffset = ab8500_irq_regoffset[i];
 259                 int status;
 260
 261                 status = ab8500_read(ab8500, AB8500_IT_LATCH1_REG + regoffset);
 262                 if (status <= 0)
 263                         continue;
 264
 265                 do {
 266                         int bit = __ffs(status);
 267                         int line = i * 8 + bit;
 268
 269                         handle_nested_irq(ab8500->irq_base + line);
 270                         status &= ~(1 << bit);
 271                 } while (status);
 272         }
 273
 274         return IRQ_HANDLED;
 275 }
 276
 277 static int ab8500_irq_init(struct ab8500 *ab8500)
 278 {
 279         int base = ab8500->irq_base;
 280         int irq;
 281
 282         for (irq = base; irq < base + AB8500_NR_IRQS; irq++) {
 283                 set_irq_chip_data(irq, ab8500);
 284                 set_irq_chip_and_handler(irq, &ab8500_irq_chip,
 285                                          handle_simple_irq);
 286                 set_irq_nested_thread(irq, 1);
 287 #ifdef CONFIG_ARM
 288                 set_irq_flags(irq, IRQF_VALID);
 289 #else
 290                 set_irq_noprobe(irq);
 291 #endif
 292         }
 293
 294         return 0;
 295 }
 296
 297 static void ab8500_irq_remove(struct ab8500 *ab8500)
 298 {
 299         int base = ab8500->irq_base;
 300         int irq;
 301
 302         for (irq = base; irq < base + AB8500_NR_IRQS; irq++) {
 303 #ifdef CONFIG_ARM
 304                 set_irq_flags(irq, 0);
 305 #endif
 306                 set_irq_chip_and_handler(irq, NULL, NULL);
 307                 set_irq_chip_data(irq, NULL);
 308         }
 309 }
 310
 311 static struct resource ab8500_gpadc_resources[] = {
 312         {
 313                 .name   = "HW_CONV_END",
 314                 .start  = AB8500_INT_GP_HW_ADC_CONV_END,
 315                 .end    = AB8500_INT_GP_HW_ADC_CONV_END,
 316                 .flags  = IORESOURCE_IRQ,
 317         },
 318         {
 319                 .name   = "SW_CONV_END",
 320                 .start  = AB8500_INT_GP_SW_ADC_CONV_END,
 321                 .end    = AB8500_INT_GP_SW_ADC_CONV_END,
 322                 .flags  = IORESOURCE_IRQ,
 323         },
 324 };
 325
 326 static struct resource ab8500_rtc_resources[] = {
 327         {
 328                 .name   = "60S",
 329                 .start  = AB8500_INT_RTC_60S,
 330                 .end    = AB8500_INT_RTC_60S,
 331                 .flags  = IORESOURCE_IRQ,
 332         },
 333         {
 334                 .name   = "ALARM",
 335                 .start  = AB8500_INT_RTC_ALARM,
 336                 .end    = AB8500_INT_RTC_ALARM,
 337                 .flags  = IORESOURCE_IRQ,
 338         },
 339 };
 340
 341 static struct mfd_cell ab8500_devs[] = {
 342         {
 343                 .name = "ab8500-gpadc",
 344                 .num_resources = ARRAY_SIZE(ab8500_gpadc_resources),
 345                 .resources = ab8500_gpadc_resources,
 346         },
 347         {
 348                 .name = "ab8500-rtc",
 349                 .num_resources = ARRAY_SIZE(ab8500_rtc_resources),
 350                 .resources = ab8500_rtc_resources,
 351         },
 352         { .name = "ab8500-charger", },
 353         { .name = "ab8500-audio", },
 354         { .name = "ab8500-usb", },
 355         { .name = "ab8500-pwm", },
 356         { .name = "ab8500-regulator", },
 357 };
 358
 359 int __devinit ab8500_init(struct ab8500 *ab8500)
 360 {
 361         struct ab8500_platform_data *plat = dev_get_platdata(ab8500->dev);
 362         int ret;
 363         int i;
 364
 365         if (plat)
 366                 ab8500->irq_base = plat->irq_base;
 367
 368         mutex_init(&ab8500->lock);
 369         mutex_init(&ab8500->irq_lock);
 370
 371         ret = ab8500_read(ab8500, AB8500_REV_REG);
 372         if (ret < 0)
 373                 return ret;
 374
 375         /*
 376          * 0x0 - Early Drop
 377          * 0x10 - Cut 1.0
 378          * 0x11 - Cut 1.1
 379          */
 380         if (ret == 0x0 || ret == 0x10 || ret == 0x11) {
 381                 ab8500->revision = ret;
 382                 dev_info(ab8500->dev, "detected chip, revision: %#x\n", ret);
 383         } else {
 384                 dev_err(ab8500->dev, "unknown chip, revision: %#x\n", ret);
 385                 return -EINVAL;
 386         }
 387
 388         if (plat && plat->init)
 389                 plat->init(ab8500);
 390
 391         /* Clear and mask all interrupts */
 392         for (i = 0; i < 10; i++) {
 393                 ab8500_read(ab8500, AB8500_IT_LATCH1_REG + i);
 394                 ab8500_write(ab8500, AB8500_IT_MASK1_REG + i, 0xff);
 395         }
 396
 397         for (i = 18; i < 24; i++) {
 398                 ab8500_read(ab8500, AB8500_IT_LATCH1_REG + i);
 399                 ab8500_write(ab8500, AB8500_IT_MASK1_REG + i, 0xff);
 400         }
 401
 402         for (i = 0; i < AB8500_NUM_IRQ_REGS; i++)
 403                 ab8500->mask[i] = ab8500->oldmask[i] = 0xff;
 404
 405         if (ab8500->irq_base) {
 406                 ret = ab8500_irq_init(ab8500);
 407                 if (ret)
 408                         return ret;
 409
 410                 ret = request_threaded_irq(ab8500->irq, NULL, ab8500_irq,
 411                                            IRQF_ONESHOT, "ab8500", ab8500);
 412                 if (ret)
 413                         goto out_removeirq;
 414         }
 415
 416         ret = mfd_add_devices(ab8500->dev, 0, ab8500_devs,
 417                               ARRAY_SIZE(ab8500_devs), NULL,
 418                               ab8500->irq_base);
 419         if (ret)
 420                 goto out_freeirq;
 421
 422         return ret;
 423
 424 out_freeirq:
 425         if (ab8500->irq_base) {
 426                 free_irq(ab8500->irq, ab8500);
 427 out_removeirq:
 428                 ab8500_irq_remove(ab8500);
 429         }
 430         return ret;
 431 }
 432
 433 int __devexit ab8500_exit(struct ab8500 *ab8500)
 434 {
 435         mfd_remove_devices(ab8500->dev);
 436         if (ab8500->irq_base) {
 437                 free_irq(ab8500->irq, ab8500);
 438                 ab8500_irq_remove(ab8500);
 439         }
 440
 441         return 0;
 442 }
 443
 444 MODULE_AUTHOR("Srinidhi Kasagar, Rabin Vincent");
 445 MODULE_DESCRIPTION("AB8500 MFD core");
 446 MODULE_LICENSE("GPL v2");