drivers/mfd/asic3.c

   1 /*
   2  * driver/mfd/asic3.c
   3  *
   4  * Compaq ASIC3 support.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * Copyright 2001 Compaq Computer Corporation.
  11  * Copyright 2004-2005 Phil Blundell
  12  * Copyright 2007 OpenedHand Ltd.
  13  *
  14  * Authors: Phil Blundell <pb@handhelds.org>,
  15  *          Samuel Ortiz <sameo@openedhand.com>
  16  *
  17  */
  18
  19 #include <linux/version.h>
  20 #include <linux/kernel.h>
  21 #include <linux/irq.h>
  22 #include <linux/io.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/platform_device.h>
  25
  26 #include <linux/mfd/asic3.h>
  27
  28 static inline void asic3_write_register(struct asic3 *asic,
  29                                  unsigned int reg, u32 value)
  30 {
  31         iowrite16(value, asic->mapping +
  32                   (reg >> asic->bus_shift));
  33 }
  34
  35 static inline u32 asic3_read_register(struct asic3 *asic,
  36                                unsigned int reg)
  37 {
  38         return ioread16(asic->mapping +
  39                         (reg >> asic->bus_shift));
  40 }
  41
  42 /* IRQs */
  43 #define MAX_ASIC_ISR_LOOPS    20
  44 #define ASIC3_GPIO_Base_INCR \
  45         (ASIC3_GPIO_B_Base - ASIC3_GPIO_A_Base)
  46
  47 static void asic3_irq_flip_edge(struct asic3 *asic,
  48                                 u32 base, int bit)
  49 {
  50         u16 edge;
  51         unsigned long flags;
  52
  53         spin_lock_irqsave(&asic->lock, flags);
  54         edge = asic3_read_register(asic,
  55                                    base + ASIC3_GPIO_EdgeTrigger);
  56         edge ^= bit;
  57         asic3_write_register(asic,
  58                              base + ASIC3_GPIO_EdgeTrigger, edge);
  59         spin_unlock_irqrestore(&asic->lock, flags);
  60 }
  61
  62 static void asic3_irq_demux(unsigned int irq, struct irq_desc *desc)
  63 {
  64         int iter, i;
  65         unsigned long flags;
  66         struct asic3 *asic;
  67
  68         desc->chip->ack(irq);
  69
  70         asic = desc->handler_data;
  71
  72         for (iter = 0 ; iter < MAX_ASIC_ISR_LOOPS; iter++) {
  73                 u32 status;
  74                 int bank;
  75
  76                 spin_lock_irqsave(&asic->lock, flags);
  77                 status = asic3_read_register(asic,
  78                                              ASIC3_OFFSET(INTR, PIntStat));
  79                 spin_unlock_irqrestore(&asic->lock, flags);
  80
  81                 /* Check all ten register bits */
  82                 if ((status & 0x3ff) == 0)
  83                         break;
  84
  85                 /* Handle GPIO IRQs */
  86                 for (bank = 0; bank < ASIC3_NUM_GPIO_BANKS; bank++) {
  87                         if (status & (1 << bank)) {
  88                                 unsigned long base, istat;
  89
  90                                 base = ASIC3_GPIO_A_Base
  91                                        + bank * ASIC3_GPIO_Base_INCR;
  92
  93                                 spin_lock_irqsave(&asic->lock, flags);
  94                                 istat = asic3_read_register(asic,
  95                                                             base +
  96                                                             ASIC3_GPIO_IntStatus);
  97                                 /* Clearing IntStatus */
  98                                 asic3_write_register(asic,
  99                                                      base +
 100                                                      ASIC3_GPIO_IntStatus, 0);
 101                                 spin_unlock_irqrestore(&asic->lock, flags);
 102
 103                                 for (i = 0; i < ASIC3_GPIOS_PER_BANK; i++) {
 104                                         int bit = (1 << i);
 105                                         unsigned int irqnr;
 106
 107                                         if (!(istat & bit))
 108                                                 continue;
 109
 110                                         irqnr = asic->irq_base +
 111                                                 (ASIC3_GPIOS_PER_BANK * bank)
 112                                                 + i;
 113                                         desc = irq_desc + irqnr;
 114                                         desc->handle_irq(irqnr, desc);
 115                                         if (asic->irq_bothedge[bank] & bit)
 116                                                 asic3_irq_flip_edge(asic, base,
 117                                                                     bit);
 118                                 }
 119                         }
 120                 }
 121
 122                 /* Handle remaining IRQs in the status register */
 123                 for (i = ASIC3_NUM_GPIOS; i < ASIC3_NR_IRQS; i++) {
 124                         /* They start at bit 4 and go up */
 125                         if (status & (1 << (i - ASIC3_NUM_GPIOS + 4))) {
 126                                 desc = irq_desc +  + i;
 127                                 desc->handle_irq(asic->irq_base + i,
 128                                                  desc);
 129                         }
 130                 }
 131         }
 132
 133         if (iter >= MAX_ASIC_ISR_LOOPS)
 134                 printk(KERN_ERR "%s: interrupt processing overrun\n",
 135                        __func__);
 136 }
 137
 138 static inline int asic3_irq_to_bank(struct asic3 *asic, int irq)
 139 {
 140         int n;
 141
 142         n = (irq - asic->irq_base) >> 4;
 143
 144         return (n * (ASIC3_GPIO_B_Base - ASIC3_GPIO_A_Base));
 145 }
 146
 147 static inline int asic3_irq_to_index(struct asic3 *asic, int irq)
 148 {
 149         return (irq - asic->irq_base) & 0xf;
 150 }
 151
 152 static void asic3_mask_gpio_irq(unsigned int irq)
 153 {
 154         struct asic3 *asic = get_irq_chip_data(irq);
 155         u32 val, bank, index;
 156         unsigned long flags;
 157
 158         bank = asic3_irq_to_bank(asic, irq);
 159         index = asic3_irq_to_index(asic, irq);
 160
 161         spin_lock_irqsave(&asic->lock, flags);
 162         val = asic3_read_register(asic, bank + ASIC3_GPIO_Mask);
 163         val |= 1 << index;
 164         asic3_write_register(asic, bank + ASIC3_GPIO_Mask, val);
 165         spin_unlock_irqrestore(&asic->lock, flags);
 166 }
 167
 168 static void asic3_mask_irq(unsigned int irq)
 169 {
 170         struct asic3 *asic = get_irq_chip_data(irq);
 171         int regval;
 172         unsigned long flags;
 173
 174         spin_lock_irqsave(&asic->lock, flags);
 175         regval = asic3_read_register(asic,
 176                                      ASIC3_INTR_Base +
 177                                      ASIC3_INTR_IntMask);
 178
 179         regval &= ~(ASIC3_INTMASK_MASK0 <<
 180                     (irq - (asic->irq_base + ASIC3_NUM_GPIOS)));
 181
 182         asic3_write_register(asic,
 183                              ASIC3_INTR_Base +
 184                              ASIC3_INTR_IntMask,
 185                              regval);
 186         spin_unlock_irqrestore(&asic->lock, flags);
 187 }
 188
 189 static void asic3_unmask_gpio_irq(unsigned int irq)
 190 {
 191         struct asic3 *asic = get_irq_chip_data(irq);
 192         u32 val, bank, index;
 193         unsigned long flags;
 194
 195         bank = asic3_irq_to_bank(asic, irq);
 196         index = asic3_irq_to_index(asic, irq);
 197
 198         spin_lock_irqsave(&asic->lock, flags);
 199         val = asic3_read_register(asic, bank + ASIC3_GPIO_Mask);
 200         val &= ~(1 << index);
 201         asic3_write_register(asic, bank + ASIC3_GPIO_Mask, val);
 202         spin_unlock_irqrestore(&asic->lock, flags);
 203 }
 204
 205 static void asic3_unmask_irq(unsigned int irq)
 206 {
 207         struct asic3 *asic = get_irq_chip_data(irq);
 208         int regval;
 209         unsigned long flags;
 210
 211         spin_lock_irqsave(&asic->lock, flags);
 212         regval = asic3_read_register(asic,
 213                                      ASIC3_INTR_Base +
 214                                      ASIC3_INTR_IntMask);
 215
 216         regval |= (ASIC3_INTMASK_MASK0 <<
 217                    (irq - (asic->irq_base + ASIC3_NUM_GPIOS)));
 218
 219         asic3_write_register(asic,
 220                              ASIC3_INTR_Base +
 221                              ASIC3_INTR_IntMask,
 222                              regval);
 223         spin_unlock_irqrestore(&asic->lock, flags);
 224 }
 225
 226 static int asic3_gpio_irq_type(unsigned int irq, unsigned int type)
 227 {
 228         struct asic3 *asic = get_irq_chip_data(irq);
 229         u32 bank, index;
 230         u16 trigger, level, edge, bit;
 231         unsigned long flags;
 232
 233         bank = asic3_irq_to_bank(asic, irq);
 234         index = asic3_irq_to_index(asic, irq);
 235         bit = 1<<index;
 236
 237         spin_lock_irqsave(&asic->lock, flags);
 238         level = asic3_read_register(asic,
 239                                     bank + ASIC3_GPIO_LevelTrigger);
 240         edge = asic3_read_register(asic,
 241                                    bank + ASIC3_GPIO_EdgeTrigger);
 242         trigger = asic3_read_register(asic,
 243                                       bank + ASIC3_GPIO_TriggerType);
 244         asic->irq_bothedge[(irq - asic->irq_base) >> 4] &= ~bit;
 245
 246         if (type == IRQT_RISING) {
 247                 trigger |= bit;
 248                 edge |= bit;
 249         } else if (type == IRQT_FALLING) {
 250                 trigger |= bit;
 251                 edge &= ~bit;
 252         } else if (type == IRQT_BOTHEDGE) {
 253                 trigger |= bit;
 254                 if (asic3_gpio_get_value(asic, irq - asic->irq_base))
 255                         edge &= ~bit;
 256                 else
 257                         edge |= bit;
 258                 asic->irq_bothedge[(irq - asic->irq_base) >> 4] |= bit;
 259         } else if (type == IRQT_LOW) {
 260                 trigger &= ~bit;
 261                 level &= ~bit;
 262         } else if (type == IRQT_HIGH) {
 263                 trigger &= ~bit;
 264                 level |= bit;
 265         } else {
 266                 /*
 267                  * if type == IRQT_NOEDGE, we should mask interrupts, but
 268                  * be careful to not unmask them if mask was also called.
 269                  * Probably need internal state for mask.
 270                  */
 271                 printk(KERN_NOTICE "asic3: irq type not changed.\n");
 272         }
 273         asic3_write_register(asic, bank + ASIC3_GPIO_LevelTrigger,
 274                              level);
 275         asic3_write_register(asic, bank + ASIC3_GPIO_EdgeTrigger,
 276                              edge);
 277         asic3_write_register(asic, bank + ASIC3_GPIO_TriggerType,
 278                              trigger);
 279         spin_unlock_irqrestore(&asic->lock, flags);
 280         return 0;
 281 }
 282
 283 static struct irq_chip asic3_gpio_irq_chip = {
 284         .name           = "ASIC3-GPIO",
 285         .ack            = asic3_mask_gpio_irq,
 286         .mask           = asic3_mask_gpio_irq,
 287         .unmask         = asic3_unmask_gpio_irq,
 288         .set_type       = asic3_gpio_irq_type,
 289 };
 290
 291 static struct irq_chip asic3_irq_chip = {
 292         .name           = "ASIC3",
 293         .ack            = asic3_mask_irq,
 294         .mask           = asic3_mask_irq,
 295         .unmask         = asic3_unmask_irq,
 296 };
 297
 298 static int asic3_irq_probe(struct platform_device *pdev)
 299 {
 300         struct asic3 *asic = platform_get_drvdata(pdev);
 301         unsigned long clksel = 0;
 302         unsigned int irq, irq_base;
 303
 304         asic->irq_nr = platform_get_irq(pdev, 0);
 305         if (asic->irq_nr < 0)
 306                 return asic->irq_nr;
 307
 308         /* turn on clock to IRQ controller */
 309         clksel |= CLOCK_SEL_CX;
 310         asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL),
 311                              clksel);
 312
 313         irq_base = asic->irq_base;
 314
 315         for (irq = irq_base; irq < irq_base + ASIC3_NR_IRQS; irq++) {
 316                 if (irq < asic->irq_base + ASIC3_NUM_GPIOS)
 317                         set_irq_chip(irq, &asic3_gpio_irq_chip);
 318                 else
 319                         set_irq_chip(irq, &asic3_irq_chip);
 320
 321                 set_irq_chip_data(irq, asic);
 322                 set_irq_handler(irq, handle_level_irq);
 323                 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
 324         }
 325
 326         asic3_write_register(asic, ASIC3_OFFSET(INTR, IntMask),
 327                              ASIC3_INTMASK_GINTMASK);
 328
 329         set_irq_chained_handler(asic->irq_nr, asic3_irq_demux);
 330         set_irq_type(asic->irq_nr, IRQT_RISING);
 331         set_irq_data(asic->irq_nr, asic);
 332
 333         return 0;
 334 }
 335
 336 static void asic3_irq_remove(struct platform_device *pdev)
 337 {
 338         struct asic3 *asic = platform_get_drvdata(pdev);
 339         unsigned int irq, irq_base;
 340
 341         irq_base = asic->irq_base;
 342
 343         for (irq = irq_base; irq < irq_base + ASIC3_NR_IRQS; irq++) {
 344                 set_irq_flags(irq, 0);
 345                 set_irq_handler(irq, NULL);
 346                 set_irq_chip(irq, NULL);
 347                 set_irq_chip_data(irq, NULL);
 348         }
 349         set_irq_chained_handler(asic->irq_nr, NULL);
 350 }
 351
 352 /* GPIOs */
 353 static inline u32 asic3_get_gpio(struct asic3 *asic, unsigned int base,
 354                                  unsigned int function)
 355 {
 356         return asic3_read_register(asic, base + function);
 357 }
 358
 359 static void asic3_set_gpio(struct asic3 *asic, unsigned int base,
 360                            unsigned int function, u32 bits, u32 val)
 361 {
 362         unsigned long flags;
 363
 364         spin_lock_irqsave(&asic->lock, flags);
 365         val |= (asic3_read_register(asic, base + function) & ~bits);
 366
 367         asic3_write_register(asic, base + function, val);
 368         spin_unlock_irqrestore(&asic->lock, flags);
 369 }
 370
 371 #define asic3_get_gpio_a(asic, fn) \
 372         asic3_get_gpio(asic, ASIC3_GPIO_A_Base, ASIC3_GPIO_##fn)
 373 #define asic3_get_gpio_b(asic, fn) \
 374         asic3_get_gpio(asic, ASIC3_GPIO_B_Base, ASIC3_GPIO_##fn)
 375 #define asic3_get_gpio_c(asic, fn) \
 376         asic3_get_gpio(asic, ASIC3_GPIO_C_Base, ASIC3_GPIO_##fn)
 377 #define asic3_get_gpio_d(asic, fn) \
 378         asic3_get_gpio(asic, ASIC3_GPIO_D_Base, ASIC3_GPIO_##fn)
 379
 380 #define asic3_set_gpio_a(asic, fn, bits, val) \
 381         asic3_set_gpio(asic, ASIC3_GPIO_A_Base, ASIC3_GPIO_##fn, bits, val)
 382 #define asic3_set_gpio_b(asic, fn, bits, val) \
 383         asic3_set_gpio(asic, ASIC3_GPIO_B_Base, ASIC3_GPIO_##fn, bits, val)
 384 #define asic3_set_gpio_c(asic, fn, bits, val) \
 385         asic3_set_gpio(asic, ASIC3_GPIO_C_Base, ASIC3_GPIO_##fn, bits, val)
 386 #define asic3_set_gpio_d(asic, fn, bits, val) \
 387         asic3_set_gpio(asic, ASIC3_GPIO_D_Base, ASIC3_GPIO_##fn, bits, val)
 388
 389 #define asic3_set_gpio_banks(asic, fn, bits, pdata, field)                \
 390         do {                                                              \
 391              asic3_set_gpio_a((asic), fn, (bits), (pdata)->gpio_a.field); \
 392              asic3_set_gpio_b((asic), fn, (bits), (pdata)->gpio_b.field); \
 393              asic3_set_gpio_c((asic), fn, (bits), (pdata)->gpio_c.field); \
 394              asic3_set_gpio_d((asic), fn, (bits), (pdata)->gpio_d.field); \
 395         } while (0)
 396
 397 int asic3_gpio_get_value(struct asic3 *asic, unsigned gpio)
 398 {
 399         u32 mask = ASIC3_GPIO_bit(gpio);
 400
 401         switch (gpio >> 4) {
 402         case ASIC3_GPIO_BANK_A:
 403                 return asic3_get_gpio_a(asic, Status) & mask;
 404         case ASIC3_GPIO_BANK_B:
 405                 return asic3_get_gpio_b(asic, Status) & mask;
 406         case ASIC3_GPIO_BANK_C:
 407                 return asic3_get_gpio_c(asic, Status) & mask;
 408         case ASIC3_GPIO_BANK_D:
 409                 return asic3_get_gpio_d(asic, Status) & mask;
 410         default:
 411                 printk(KERN_ERR "%s: invalid GPIO value 0x%x",
 412                        __func__, gpio);
 413                 return -EINVAL;
 414         }
 415 }
 416 EXPORT_SYMBOL(asic3_gpio_get_value);
 417
 418 void asic3_gpio_set_value(struct asic3 *asic, unsigned gpio, int val)
 419 {
 420         u32 mask = ASIC3_GPIO_bit(gpio);
 421         u32 bitval = 0;
 422         if (val)
 423                 bitval = mask;
 424
 425         switch (gpio >> 4) {
 426         case ASIC3_GPIO_BANK_A:
 427                 asic3_set_gpio_a(asic, Out, mask, bitval);
 428                 return;
 429         case ASIC3_GPIO_BANK_B:
 430                 asic3_set_gpio_b(asic, Out, mask, bitval);
 431                 return;
 432         case ASIC3_GPIO_BANK_C:
 433                 asic3_set_gpio_c(asic, Out, mask, bitval);
 434                 return;
 435         case ASIC3_GPIO_BANK_D:
 436                 asic3_set_gpio_d(asic, Out, mask, bitval);
 437                 return;
 438         default:
 439                 printk(KERN_ERR "%s: invalid GPIO value 0x%x",
 440                        __func__, gpio);
 441                 return;
 442         }
 443 }
 444 EXPORT_SYMBOL(asic3_gpio_set_value);
 445
 446 static int asic3_gpio_probe(struct platform_device *pdev)
 447 {
 448         struct asic3_platform_data *pdata = pdev->dev.platform_data;
 449         struct asic3 *asic = platform_get_drvdata(pdev);
 450
 451         asic3_write_register(asic, ASIC3_GPIO_OFFSET(A, Mask), 0xffff);
 452         asic3_write_register(asic, ASIC3_GPIO_OFFSET(B, Mask), 0xffff);
 453         asic3_write_register(asic, ASIC3_GPIO_OFFSET(C, Mask), 0xffff);
 454         asic3_write_register(asic, ASIC3_GPIO_OFFSET(D, Mask), 0xffff);
 455
 456         asic3_set_gpio_a(asic, SleepMask, 0xffff, 0xffff);
 457         asic3_set_gpio_b(asic, SleepMask, 0xffff, 0xffff);
 458         asic3_set_gpio_c(asic, SleepMask, 0xffff, 0xffff);
 459         asic3_set_gpio_d(asic, SleepMask, 0xffff, 0xffff);
 460
 461         if (pdata) {
 462                 asic3_set_gpio_banks(asic, Out, 0xffff, pdata, init);
 463                 asic3_set_gpio_banks(asic, Direction, 0xffff, pdata, dir);
 464                 asic3_set_gpio_banks(asic, SleepMask, 0xffff, pdata,
 465                                      sleep_mask);
 466                 asic3_set_gpio_banks(asic, SleepOut, 0xffff, pdata, sleep_out);
 467                 asic3_set_gpio_banks(asic, BattFaultOut, 0xffff, pdata,
 468                                      batt_fault_out);
 469                 asic3_set_gpio_banks(asic, SleepConf, 0xffff, pdata,
 470                                      sleep_conf);
 471                 asic3_set_gpio_banks(asic, AltFunction, 0xffff, pdata,
 472                                      alt_function);
 473         }
 474
 475         return 0;
 476 }
 477
 478 static void asic3_gpio_remove(struct platform_device *pdev)
 479 {
 480         return;
 481 }
 482
 483
 484 /* Core */
 485 static int asic3_probe(struct platform_device *pdev)
 486 {
 487         struct asic3_platform_data *pdata = pdev->dev.platform_data;
 488         struct asic3 *asic;
 489         struct resource *mem;
 490         unsigned long clksel;
 491         int ret;
 492
 493         asic = kzalloc(sizeof(struct asic3), GFP_KERNEL);
 494         if (!asic)
 495                 return -ENOMEM;
 496
 497         spin_lock_init(&asic->lock);
 498         platform_set_drvdata(pdev, asic);
 499         asic->dev = &pdev->dev;
 500
 501         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 502         if (!mem) {
 503                 ret = -ENOMEM;
 504                 printk(KERN_ERR "asic3: no MEM resource\n");
 505                 goto err_out_1;
 506         }
 507
 508         asic->mapping = ioremap(mem->start, PAGE_SIZE);
 509         if (!asic->mapping) {
 510                 ret = -ENOMEM;
 511                 printk(KERN_ERR "asic3: couldn't ioremap\n");
 512                 goto err_out_1;
 513         }
 514
 515         asic->irq_base = pdata->irq_base;
 516
 517         if (pdata && pdata->bus_shift)
 518                 asic->bus_shift = 2 - pdata->bus_shift;
 519         else
 520                 asic->bus_shift = 0;
 521
 522         clksel = 0;
 523         asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL), clksel);
 524
 525         ret = asic3_irq_probe(pdev);
 526         if (ret < 0) {
 527                 printk(KERN_ERR "asic3: couldn't probe IRQs\n");
 528                 goto err_out_2;
 529         }
 530         asic3_gpio_probe(pdev);
 531
 532         if (pdata->children) {
 533                 int i;
 534                 for (i = 0; i < pdata->n_children; i++) {
 535                         pdata->children[i]->dev.parent = &pdev->dev;
 536                         platform_device_register(pdata->children[i]);
 537                 }
 538         }
 539
 540         printk(KERN_INFO "ASIC3 Core driver\n");
 541
 542         return 0;
 543
 544  err_out_2:
 545         iounmap(asic->mapping);
 546  err_out_1:
 547         kfree(asic);
 548
 549         return ret;
 550 }
 551
 552 static int asic3_remove(struct platform_device *pdev)
 553 {
 554         struct asic3 *asic = platform_get_drvdata(pdev);
 555
 556         asic3_gpio_remove(pdev);
 557         asic3_irq_remove(pdev);
 558
 559         asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL), 0);
 560
 561         iounmap(asic->mapping);
 562
 563         kfree(asic);
 564
 565         return 0;
 566 }
 567
 568 static void asic3_shutdown(struct platform_device *pdev)
 569 {
 570 }
 571
 572 static struct platform_driver asic3_device_driver = {
 573         .driver         = {
 574                 .name   = "asic3",
 575         },
 576         .probe          = asic3_probe,
 577         .remove         = __devexit_p(asic3_remove),
 578         .shutdown       = asic3_shutdown,
 579 };
 580
 581 static int __init asic3_init(void)
 582 {
 583         int retval = 0;
 584         retval = platform_driver_register(&asic3_device_driver);
 585         return retval;
 586 }
 587
 588 subsys_initcall(asic3_init);