linux/arch/arm/common/locomo.c
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   1/*
   2 * linux/arch/arm/common/locomo.c
   3 *
   4 * Sharp LoCoMo 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 * This file contains all generic LoCoMo support.
  11 *
  12 * All initialization functions provided here are intended to be called
  13 * from machine specific code with proper arguments when required.
  14 *
  15 * Based on sa1111.c
  16 */
  17
  18#include <linux/module.h>
  19#include <linux/init.h>
  20#include <linux/kernel.h>
  21#include <linux/delay.h>
  22#include <linux/errno.h>
  23#include <linux/ioport.h>
  24#include <linux/platform_device.h>
  25#include <linux/slab.h>
  26#include <linux/spinlock.h>
  27#include <linux/io.h>
  28
  29#include <mach/hardware.h>
  30#include <asm/irq.h>
  31#include <asm/mach/irq.h>
  32
  33#include <asm/hardware/locomo.h>
  34
  35/* LoCoMo Interrupts */
  36#define IRQ_LOCOMO_KEY          (0)
  37#define IRQ_LOCOMO_GPIO         (1)
  38#define IRQ_LOCOMO_LT           (2)
  39#define IRQ_LOCOMO_SPI          (3)
  40
  41/* M62332 output channel selection */
  42#define M62332_EVR_CH   1       /* M62332 volume channel number  */
  43                                /*   0 : CH.1 , 1 : CH. 2        */
  44/* DAC send data */
  45#define M62332_SLAVE_ADDR       0x4e    /* Slave address  */
  46#define M62332_W_BIT            0x00    /* W bit (0 only) */
  47#define M62332_SUB_ADDR         0x00    /* Sub address    */
  48#define M62332_A_BIT            0x00    /* A bit (0 only) */
  49
  50/* DAC setup and hold times (expressed in us) */
  51#define DAC_BUS_FREE_TIME       5       /*   4.7 us */
  52#define DAC_START_SETUP_TIME    5       /*   4.7 us */
  53#define DAC_STOP_SETUP_TIME     4       /*   4.0 us */
  54#define DAC_START_HOLD_TIME     5       /*   4.7 us */
  55#define DAC_SCL_LOW_HOLD_TIME   5       /*   4.7 us */
  56#define DAC_SCL_HIGH_HOLD_TIME  4       /*   4.0 us */
  57#define DAC_DATA_SETUP_TIME     1       /*   250 ns */
  58#define DAC_DATA_HOLD_TIME      1       /*   300 ns */
  59#define DAC_LOW_SETUP_TIME      1       /*   300 ns */
  60#define DAC_HIGH_SETUP_TIME     1       /*  1000 ns */
  61
  62/* the following is the overall data for the locomo chip */
  63struct locomo {
  64        struct device *dev;
  65        unsigned long phys;
  66        unsigned int irq;
  67        int irq_base;
  68        spinlock_t lock;
  69        void __iomem *base;
  70#ifdef CONFIG_PM
  71        void *saved_state;
  72#endif
  73};
  74
  75struct locomo_dev_info {
  76        unsigned long   offset;
  77        unsigned long   length;
  78        unsigned int    devid;
  79        unsigned int    irq[1];
  80        const char *    name;
  81};
  82
  83/* All the locomo devices.  If offset is non-zero, the mapbase for the
  84 * locomo_dev will be set to the chip base plus offset.  If offset is
  85 * zero, then the mapbase for the locomo_dev will be set to zero.  An
  86 * offset of zero means the device only uses GPIOs or other helper
  87 * functions inside this file */
  88static struct locomo_dev_info locomo_devices[] = {
  89        {
  90                .devid          = LOCOMO_DEVID_KEYBOARD,
  91                .irq            = { IRQ_LOCOMO_KEY },
  92                .name           = "locomo-keyboard",
  93                .offset         = LOCOMO_KEYBOARD,
  94                .length         = 16,
  95        },
  96        {
  97                .devid          = LOCOMO_DEVID_FRONTLIGHT,
  98                .irq            = {},
  99                .name           = "locomo-frontlight",
 100                .offset         = LOCOMO_FRONTLIGHT,
 101                .length         = 8,
 102
 103        },
 104        {
 105                .devid          = LOCOMO_DEVID_BACKLIGHT,
 106                .irq            = {},
 107                .name           = "locomo-backlight",
 108                .offset         = LOCOMO_BACKLIGHT,
 109                .length         = 8,
 110        },
 111        {
 112                .devid          = LOCOMO_DEVID_AUDIO,
 113                .irq            = {},
 114                .name           = "locomo-audio",
 115                .offset         = LOCOMO_AUDIO,
 116                .length         = 4,
 117        },
 118        {
 119                .devid          = LOCOMO_DEVID_LED,
 120                .irq            = {},
 121                .name           = "locomo-led",
 122                .offset         = LOCOMO_LED,
 123                .length         = 8,
 124        },
 125        {
 126                .devid          = LOCOMO_DEVID_UART,
 127                .irq            = {},
 128                .name           = "locomo-uart",
 129                .offset         = 0,
 130                .length         = 0,
 131        },
 132        {
 133                .devid          = LOCOMO_DEVID_SPI,
 134                .irq            = {},
 135                .name           = "locomo-spi",
 136                .offset         = LOCOMO_SPI,
 137                .length         = 0x30,
 138        },
 139};
 140
 141static void locomo_handler(struct irq_desc *desc)
 142{
 143        struct locomo *lchip = irq_desc_get_handler_data(desc);
 144        int req, i;
 145
 146        /* Acknowledge the parent IRQ */
 147        desc->irq_data.chip->irq_ack(&desc->irq_data);
 148
 149        /* check why this interrupt was generated */
 150        req = locomo_readl(lchip->base + LOCOMO_ICR) & 0x0f00;
 151
 152        if (req) {
 153                unsigned int irq;
 154
 155                /* generate the next interrupt(s) */
 156                irq = lchip->irq_base;
 157                for (i = 0; i <= 3; i++, irq++) {
 158                        if (req & (0x0100 << i)) {
 159                                generic_handle_irq(irq);
 160                        }
 161
 162                }
 163        }
 164}
 165
 166static void locomo_ack_irq(struct irq_data *d)
 167{
 168}
 169
 170static void locomo_mask_irq(struct irq_data *d)
 171{
 172        struct locomo *lchip = irq_data_get_irq_chip_data(d);
 173        unsigned int r;
 174        r = locomo_readl(lchip->base + LOCOMO_ICR);
 175        r &= ~(0x0010 << (d->irq - lchip->irq_base));
 176        locomo_writel(r, lchip->base + LOCOMO_ICR);
 177}
 178
 179static void locomo_unmask_irq(struct irq_data *d)
 180{
 181        struct locomo *lchip = irq_data_get_irq_chip_data(d);
 182        unsigned int r;
 183        r = locomo_readl(lchip->base + LOCOMO_ICR);
 184        r |= (0x0010 << (d->irq - lchip->irq_base));
 185        locomo_writel(r, lchip->base + LOCOMO_ICR);
 186}
 187
 188static struct irq_chip locomo_chip = {
 189        .name           = "LOCOMO",
 190        .irq_ack        = locomo_ack_irq,
 191        .irq_mask       = locomo_mask_irq,
 192        .irq_unmask     = locomo_unmask_irq,
 193};
 194
 195static void locomo_setup_irq(struct locomo *lchip)
 196{
 197        int irq = lchip->irq_base;
 198
 199        /*
 200         * Install handler for IRQ_LOCOMO_HW.
 201         */
 202        irq_set_irq_type(lchip->irq, IRQ_TYPE_EDGE_FALLING);
 203        irq_set_chained_handler_and_data(lchip->irq, locomo_handler, lchip);
 204
 205        /* Install handlers for IRQ_LOCOMO_* */
 206        for ( ; irq <= lchip->irq_base + 3; irq++) {
 207                irq_set_chip_and_handler(irq, &locomo_chip, handle_level_irq);
 208                irq_set_chip_data(irq, lchip);
 209                irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE);
 210        }
 211}
 212
 213
 214static void locomo_dev_release(struct device *_dev)
 215{
 216        struct locomo_dev *dev = LOCOMO_DEV(_dev);
 217
 218        kfree(dev);
 219}
 220
 221static int
 222locomo_init_one_child(struct locomo *lchip, struct locomo_dev_info *info)
 223{
 224        struct locomo_dev *dev;
 225        int ret;
 226
 227        dev = kzalloc(sizeof(struct locomo_dev), GFP_KERNEL);
 228        if (!dev) {
 229                ret = -ENOMEM;
 230                goto out;
 231        }
 232
 233        /*
 234         * If the parent device has a DMA mask associated with it,
 235         * propagate it down to the children.
 236         */
 237        if (lchip->dev->dma_mask) {
 238                dev->dma_mask = *lchip->dev->dma_mask;
 239                dev->dev.dma_mask = &dev->dma_mask;
 240        }
 241
 242        dev_set_name(&dev->dev, "%s", info->name);
 243        dev->devid       = info->devid;
 244        dev->dev.parent  = lchip->dev;
 245        dev->dev.bus     = &locomo_bus_type;
 246        dev->dev.release = locomo_dev_release;
 247        dev->dev.coherent_dma_mask = lchip->dev->coherent_dma_mask;
 248
 249        if (info->offset)
 250                dev->mapbase = lchip->base + info->offset;
 251        else
 252                dev->mapbase = 0;
 253        dev->length = info->length;
 254
 255        dev->irq[0] = (lchip->irq_base == NO_IRQ) ?
 256                        NO_IRQ : lchip->irq_base + info->irq[0];
 257
 258        ret = device_register(&dev->dev);
 259        if (ret) {
 260 out:
 261                kfree(dev);
 262        }
 263        return ret;
 264}
 265
 266#ifdef CONFIG_PM
 267
 268struct locomo_save_data {
 269        u16     LCM_GPO;
 270        u16     LCM_SPICT;
 271        u16     LCM_GPE;
 272        u16     LCM_ASD;
 273        u16     LCM_SPIMD;
 274};
 275
 276static int locomo_suspend(struct platform_device *dev, pm_message_t state)
 277{
 278        struct locomo *lchip = platform_get_drvdata(dev);
 279        struct locomo_save_data *save;
 280        unsigned long flags;
 281
 282        save = kmalloc(sizeof(struct locomo_save_data), GFP_KERNEL);
 283        if (!save)
 284                return -ENOMEM;
 285
 286        lchip->saved_state = save;
 287
 288        spin_lock_irqsave(&lchip->lock, flags);
 289
 290        save->LCM_GPO     = locomo_readl(lchip->base + LOCOMO_GPO);     /* GPIO */
 291        locomo_writel(0x00, lchip->base + LOCOMO_GPO);
 292        save->LCM_SPICT   = locomo_readl(lchip->base + LOCOMO_SPI + LOCOMO_SPICT);      /* SPI */
 293        locomo_writel(0x40, lchip->base + LOCOMO_SPI + LOCOMO_SPICT);
 294        save->LCM_GPE     = locomo_readl(lchip->base + LOCOMO_GPE);     /* GPIO */
 295        locomo_writel(0x00, lchip->base + LOCOMO_GPE);
 296        save->LCM_ASD     = locomo_readl(lchip->base + LOCOMO_ASD);     /* ADSTART */
 297        locomo_writel(0x00, lchip->base + LOCOMO_ASD);
 298        save->LCM_SPIMD   = locomo_readl(lchip->base + LOCOMO_SPI + LOCOMO_SPIMD);      /* SPI */
 299        locomo_writel(0x3C14, lchip->base + LOCOMO_SPI + LOCOMO_SPIMD);
 300
 301        locomo_writel(0x00, lchip->base + LOCOMO_PAIF);
 302        locomo_writel(0x00, lchip->base + LOCOMO_DAC);
 303        locomo_writel(0x00, lchip->base + LOCOMO_BACKLIGHT + LOCOMO_TC);
 304
 305        if ((locomo_readl(lchip->base + LOCOMO_LED + LOCOMO_LPT0) & 0x88) && (locomo_readl(lchip->base + LOCOMO_LED + LOCOMO_LPT1) & 0x88))
 306                locomo_writel(0x00, lchip->base + LOCOMO_C32K);         /* CLK32 off */
 307        else
 308                /* 18MHz already enabled, so no wait */
 309                locomo_writel(0xc1, lchip->base + LOCOMO_C32K);         /* CLK32 on */
 310
 311        locomo_writel(0x00, lchip->base + LOCOMO_TADC);         /* 18MHz clock off*/
 312        locomo_writel(0x00, lchip->base + LOCOMO_AUDIO + LOCOMO_ACC);                   /* 22MHz/24MHz clock off */
 313        locomo_writel(0x00, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);                      /* FL */
 314
 315        spin_unlock_irqrestore(&lchip->lock, flags);
 316
 317        return 0;
 318}
 319
 320static int locomo_resume(struct platform_device *dev)
 321{
 322        struct locomo *lchip = platform_get_drvdata(dev);
 323        struct locomo_save_data *save;
 324        unsigned long r;
 325        unsigned long flags;
 326
 327        save = lchip->saved_state;
 328        if (!save)
 329                return 0;
 330
 331        spin_lock_irqsave(&lchip->lock, flags);
 332
 333        locomo_writel(save->LCM_GPO, lchip->base + LOCOMO_GPO);
 334        locomo_writel(save->LCM_SPICT, lchip->base + LOCOMO_SPI + LOCOMO_SPICT);
 335        locomo_writel(save->LCM_GPE, lchip->base + LOCOMO_GPE);
 336        locomo_writel(save->LCM_ASD, lchip->base + LOCOMO_ASD);
 337        locomo_writel(save->LCM_SPIMD, lchip->base + LOCOMO_SPI + LOCOMO_SPIMD);
 338
 339        locomo_writel(0x00, lchip->base + LOCOMO_C32K);
 340        locomo_writel(0x90, lchip->base + LOCOMO_TADC);
 341
 342        locomo_writel(0, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KSC);
 343        r = locomo_readl(lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
 344        r &= 0xFEFF;
 345        locomo_writel(r, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
 346        locomo_writel(0x1, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KCMD);
 347
 348        spin_unlock_irqrestore(&lchip->lock, flags);
 349
 350        lchip->saved_state = NULL;
 351        kfree(save);
 352
 353        return 0;
 354}
 355#endif
 356
 357
 358/**
 359 *      locomo_probe - probe for a single LoCoMo chip.
 360 *      @phys_addr: physical address of device.
 361 *
 362 *      Probe for a LoCoMo chip.  This must be called
 363 *      before any other locomo-specific code.
 364 *
 365 *      Returns:
 366 *      %-ENODEV        device not found.
 367 *      %-EBUSY         physical address already marked in-use.
 368 *      %0              successful.
 369 */
 370static int
 371__locomo_probe(struct device *me, struct resource *mem, int irq)
 372{
 373        struct locomo_platform_data *pdata = me->platform_data;
 374        struct locomo *lchip;
 375        unsigned long r;
 376        int i, ret = -ENODEV;
 377
 378        lchip = kzalloc(sizeof(struct locomo), GFP_KERNEL);
 379        if (!lchip)
 380                return -ENOMEM;
 381
 382        spin_lock_init(&lchip->lock);
 383
 384        lchip->dev = me;
 385        dev_set_drvdata(lchip->dev, lchip);
 386
 387        lchip->phys = mem->start;
 388        lchip->irq = irq;
 389        lchip->irq_base = (pdata) ? pdata->irq_base : NO_IRQ;
 390
 391        /*
 392         * Map the whole region.  This also maps the
 393         * registers for our children.
 394         */
 395        lchip->base = ioremap(mem->start, PAGE_SIZE);
 396        if (!lchip->base) {
 397                ret = -ENOMEM;
 398                goto out;
 399        }
 400
 401        /* locomo initialize */
 402        locomo_writel(0, lchip->base + LOCOMO_ICR);
 403        /* KEYBOARD */
 404        locomo_writel(0, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
 405
 406        /* GPIO */
 407        locomo_writel(0, lchip->base + LOCOMO_GPO);
 408        locomo_writel((LOCOMO_GPIO(1) | LOCOMO_GPIO(2) | LOCOMO_GPIO(13) | LOCOMO_GPIO(14))
 409                        , lchip->base + LOCOMO_GPE);
 410        locomo_writel((LOCOMO_GPIO(1) | LOCOMO_GPIO(2) | LOCOMO_GPIO(13) | LOCOMO_GPIO(14))
 411                        , lchip->base + LOCOMO_GPD);
 412        locomo_writel(0, lchip->base + LOCOMO_GIE);
 413
 414        /* Frontlight */
 415        locomo_writel(0, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
 416        locomo_writel(0, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALD);
 417
 418        /* Longtime timer */
 419        locomo_writel(0, lchip->base + LOCOMO_LTINT);
 420        /* SPI */
 421        locomo_writel(0, lchip->base + LOCOMO_SPI + LOCOMO_SPIIE);
 422
 423        locomo_writel(6 + 8 + 320 + 30 - 10, lchip->base + LOCOMO_ASD);
 424        r = locomo_readl(lchip->base + LOCOMO_ASD);
 425        r |= 0x8000;
 426        locomo_writel(r, lchip->base + LOCOMO_ASD);
 427
 428        locomo_writel(6 + 8 + 320 + 30 - 10 - 128 + 4, lchip->base + LOCOMO_HSD);
 429        r = locomo_readl(lchip->base + LOCOMO_HSD);
 430        r |= 0x8000;
 431        locomo_writel(r, lchip->base + LOCOMO_HSD);
 432
 433        locomo_writel(128 / 8, lchip->base + LOCOMO_HSC);
 434
 435        /* XON */
 436        locomo_writel(0x80, lchip->base + LOCOMO_TADC);
 437        udelay(1000);
 438        /* CLK9MEN */
 439        r = locomo_readl(lchip->base + LOCOMO_TADC);
 440        r |= 0x10;
 441        locomo_writel(r, lchip->base + LOCOMO_TADC);
 442        udelay(100);
 443
 444        /* init DAC */
 445        r = locomo_readl(lchip->base + LOCOMO_DAC);
 446        r |= LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
 447        locomo_writel(r, lchip->base + LOCOMO_DAC);
 448
 449        r = locomo_readl(lchip->base + LOCOMO_VER);
 450        printk(KERN_INFO "LoCoMo Chip: %lu%lu\n", (r >> 8), (r & 0xff));
 451
 452        /*
 453         * The interrupt controller must be initialised before any
 454         * other device to ensure that the interrupts are available.
 455         */
 456        if (lchip->irq != NO_IRQ && lchip->irq_base != NO_IRQ)
 457                locomo_setup_irq(lchip);
 458
 459        for (i = 0; i < ARRAY_SIZE(locomo_devices); i++)
 460                locomo_init_one_child(lchip, &locomo_devices[i]);
 461        return 0;
 462
 463 out:
 464        kfree(lchip);
 465        return ret;
 466}
 467
 468static int locomo_remove_child(struct device *dev, void *data)
 469{
 470        device_unregister(dev);
 471        return 0;
 472} 
 473
 474static void __locomo_remove(struct locomo *lchip)
 475{
 476        device_for_each_child(lchip->dev, NULL, locomo_remove_child);
 477
 478        if (lchip->irq != NO_IRQ) {
 479                irq_set_chained_handler_and_data(lchip->irq, NULL, NULL);
 480        }
 481
 482        iounmap(lchip->base);
 483        kfree(lchip);
 484}
 485
 486static int locomo_probe(struct platform_device *dev)
 487{
 488        struct resource *mem;
 489        int irq;
 490
 491        mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
 492        if (!mem)
 493                return -EINVAL;
 494        irq = platform_get_irq(dev, 0);
 495        if (irq < 0)
 496                return -ENXIO;
 497
 498        return __locomo_probe(&dev->dev, mem, irq);
 499}
 500
 501static int locomo_remove(struct platform_device *dev)
 502{
 503        struct locomo *lchip = platform_get_drvdata(dev);
 504
 505        if (lchip) {
 506                __locomo_remove(lchip);
 507                platform_set_drvdata(dev, NULL);
 508        }
 509
 510        return 0;
 511}
 512
 513/*
 514 *      Not sure if this should be on the system bus or not yet.
 515 *      We really want some way to register a system device at
 516 *      the per-machine level, and then have this driver pick
 517 *      up the registered devices.
 518 */
 519static struct platform_driver locomo_device_driver = {
 520        .probe          = locomo_probe,
 521        .remove         = locomo_remove,
 522#ifdef CONFIG_PM
 523        .suspend        = locomo_suspend,
 524        .resume         = locomo_resume,
 525#endif
 526        .driver         = {
 527                .name   = "locomo",
 528        },
 529};
 530
 531/*
 532 *      Get the parent device driver (us) structure
 533 *      from a child function device
 534 */
 535static inline struct locomo *locomo_chip_driver(struct locomo_dev *ldev)
 536{
 537        return (struct locomo *)dev_get_drvdata(ldev->dev.parent);
 538}
 539
 540void locomo_gpio_set_dir(struct device *dev, unsigned int bits, unsigned int dir)
 541{
 542        struct locomo *lchip = dev_get_drvdata(dev);
 543        unsigned long flags;
 544        unsigned int r;
 545
 546        if (!lchip)
 547                return;
 548
 549        spin_lock_irqsave(&lchip->lock, flags);
 550
 551        r = locomo_readl(lchip->base + LOCOMO_GPD);
 552        if (dir)
 553                r |= bits;
 554        else
 555                r &= ~bits;
 556        locomo_writel(r, lchip->base + LOCOMO_GPD);
 557
 558        r = locomo_readl(lchip->base + LOCOMO_GPE);
 559        if (dir)
 560                r |= bits;
 561        else
 562                r &= ~bits;
 563        locomo_writel(r, lchip->base + LOCOMO_GPE);
 564
 565        spin_unlock_irqrestore(&lchip->lock, flags);
 566}
 567EXPORT_SYMBOL(locomo_gpio_set_dir);
 568
 569int locomo_gpio_read_level(struct device *dev, unsigned int bits)
 570{
 571        struct locomo *lchip = dev_get_drvdata(dev);
 572        unsigned long flags;
 573        unsigned int ret;
 574
 575        if (!lchip)
 576                return -ENODEV;
 577
 578        spin_lock_irqsave(&lchip->lock, flags);
 579        ret = locomo_readl(lchip->base + LOCOMO_GPL);
 580        spin_unlock_irqrestore(&lchip->lock, flags);
 581
 582        ret &= bits;
 583        return ret;
 584}
 585EXPORT_SYMBOL(locomo_gpio_read_level);
 586
 587int locomo_gpio_read_output(struct device *dev, unsigned int bits)
 588{
 589        struct locomo *lchip = dev_get_drvdata(dev);
 590        unsigned long flags;
 591        unsigned int ret;
 592
 593        if (!lchip)
 594                return -ENODEV;
 595
 596        spin_lock_irqsave(&lchip->lock, flags);
 597        ret = locomo_readl(lchip->base + LOCOMO_GPO);
 598        spin_unlock_irqrestore(&lchip->lock, flags);
 599
 600        ret &= bits;
 601        return ret;
 602}
 603EXPORT_SYMBOL(locomo_gpio_read_output);
 604
 605void locomo_gpio_write(struct device *dev, unsigned int bits, unsigned int set)
 606{
 607        struct locomo *lchip = dev_get_drvdata(dev);
 608        unsigned long flags;
 609        unsigned int r;
 610
 611        if (!lchip)
 612                return;
 613
 614        spin_lock_irqsave(&lchip->lock, flags);
 615
 616        r = locomo_readl(lchip->base + LOCOMO_GPO);
 617        if (set)
 618                r |= bits;
 619        else
 620                r &= ~bits;
 621        locomo_writel(r, lchip->base + LOCOMO_GPO);
 622
 623        spin_unlock_irqrestore(&lchip->lock, flags);
 624}
 625EXPORT_SYMBOL(locomo_gpio_write);
 626
 627static void locomo_m62332_sendbit(void *mapbase, int bit)
 628{
 629        unsigned int r;
 630
 631        r = locomo_readl(mapbase + LOCOMO_DAC);
 632        r &=  ~(LOCOMO_DAC_SCLOEB);
 633        locomo_writel(r, mapbase + LOCOMO_DAC);
 634        udelay(DAC_LOW_SETUP_TIME);     /* 300 nsec */
 635        udelay(DAC_DATA_HOLD_TIME);     /* 300 nsec */
 636        r = locomo_readl(mapbase + LOCOMO_DAC);
 637        r &=  ~(LOCOMO_DAC_SCLOEB);
 638        locomo_writel(r, mapbase + LOCOMO_DAC);
 639        udelay(DAC_LOW_SETUP_TIME);     /* 300 nsec */
 640        udelay(DAC_SCL_LOW_HOLD_TIME);  /* 4.7 usec */
 641
 642        if (bit & 1) {
 643                r = locomo_readl(mapbase + LOCOMO_DAC);
 644                r |=  LOCOMO_DAC_SDAOEB;
 645                locomo_writel(r, mapbase + LOCOMO_DAC);
 646                udelay(DAC_HIGH_SETUP_TIME);    /* 1000 nsec */
 647        } else {
 648                r = locomo_readl(mapbase + LOCOMO_DAC);
 649                r &=  ~(LOCOMO_DAC_SDAOEB);
 650                locomo_writel(r, mapbase + LOCOMO_DAC);
 651                udelay(DAC_LOW_SETUP_TIME);     /* 300 nsec */
 652        }
 653
 654        udelay(DAC_DATA_SETUP_TIME);    /* 250 nsec */
 655        r = locomo_readl(mapbase + LOCOMO_DAC);
 656        r |=  LOCOMO_DAC_SCLOEB;
 657        locomo_writel(r, mapbase + LOCOMO_DAC);
 658        udelay(DAC_HIGH_SETUP_TIME);    /* 1000 nsec */
 659        udelay(DAC_SCL_HIGH_HOLD_TIME); /*  4.0 usec */
 660}
 661
 662void locomo_m62332_senddata(struct locomo_dev *ldev, unsigned int dac_data, int channel)
 663{
 664        struct locomo *lchip = locomo_chip_driver(ldev);
 665        int i;
 666        unsigned char data;
 667        unsigned int r;
 668        void *mapbase = lchip->base;
 669        unsigned long flags;
 670
 671        spin_lock_irqsave(&lchip->lock, flags);
 672
 673        /* Start */
 674        udelay(DAC_BUS_FREE_TIME);      /* 5.0 usec */
 675        r = locomo_readl(mapbase + LOCOMO_DAC);
 676        r |=  LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
 677        locomo_writel(r, mapbase + LOCOMO_DAC);
 678        udelay(DAC_HIGH_SETUP_TIME);    /* 1000 nsec */
 679        udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4.0 usec */
 680        r = locomo_readl(mapbase + LOCOMO_DAC);
 681        r &=  ~(LOCOMO_DAC_SDAOEB);
 682        locomo_writel(r, mapbase + LOCOMO_DAC);
 683        udelay(DAC_START_HOLD_TIME);    /* 5.0 usec */
 684        udelay(DAC_DATA_HOLD_TIME);     /* 300 nsec */
 685
 686        /* Send slave address and W bit (LSB is W bit) */
 687        data = (M62332_SLAVE_ADDR << 1) | M62332_W_BIT;
 688        for (i = 1; i <= 8; i++) {
 689                locomo_m62332_sendbit(mapbase, data >> (8 - i));
 690        }
 691
 692        /* Check A bit */
 693        r = locomo_readl(mapbase + LOCOMO_DAC);
 694        r &=  ~(LOCOMO_DAC_SCLOEB);
 695        locomo_writel(r, mapbase + LOCOMO_DAC);
 696        udelay(DAC_LOW_SETUP_TIME);     /* 300 nsec */
 697        udelay(DAC_SCL_LOW_HOLD_TIME);  /* 4.7 usec */
 698        r = locomo_readl(mapbase + LOCOMO_DAC);
 699        r &=  ~(LOCOMO_DAC_SDAOEB);
 700        locomo_writel(r, mapbase + LOCOMO_DAC);
 701        udelay(DAC_LOW_SETUP_TIME);     /* 300 nsec */
 702        r = locomo_readl(mapbase + LOCOMO_DAC);
 703        r |=  LOCOMO_DAC_SCLOEB;
 704        locomo_writel(r, mapbase + LOCOMO_DAC);
 705        udelay(DAC_HIGH_SETUP_TIME);    /* 1000 nsec */
 706        udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4.7 usec */
 707        if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) {   /* High is error */
 708                printk(KERN_WARNING "locomo: m62332_senddata Error 1\n");
 709                goto out;
 710        }
 711
 712        /* Send Sub address (LSB is channel select) */
 713        /*    channel = 0 : ch1 select              */
 714        /*            = 1 : ch2 select              */
 715        data = M62332_SUB_ADDR + channel;
 716        for (i = 1; i <= 8; i++) {
 717                locomo_m62332_sendbit(mapbase, data >> (8 - i));
 718        }
 719
 720        /* Check A bit */
 721        r = locomo_readl(mapbase + LOCOMO_DAC);
 722        r &=  ~(LOCOMO_DAC_SCLOEB);
 723        locomo_writel(r, mapbase + LOCOMO_DAC);
 724        udelay(DAC_LOW_SETUP_TIME);     /* 300 nsec */
 725        udelay(DAC_SCL_LOW_HOLD_TIME);  /* 4.7 usec */
 726        r = locomo_readl(mapbase + LOCOMO_DAC);
 727        r &=  ~(LOCOMO_DAC_SDAOEB);
 728        locomo_writel(r, mapbase + LOCOMO_DAC);
 729        udelay(DAC_LOW_SETUP_TIME);     /* 300 nsec */
 730        r = locomo_readl(mapbase + LOCOMO_DAC);
 731        r |=  LOCOMO_DAC_SCLOEB;
 732        locomo_writel(r, mapbase + LOCOMO_DAC);
 733        udelay(DAC_HIGH_SETUP_TIME);    /* 1000 nsec */
 734        udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4.7 usec */
 735        if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) {   /* High is error */
 736                printk(KERN_WARNING "locomo: m62332_senddata Error 2\n");
 737                goto out;
 738        }
 739
 740        /* Send DAC data */
 741        for (i = 1; i <= 8; i++) {
 742                locomo_m62332_sendbit(mapbase, dac_data >> (8 - i));
 743        }
 744
 745        /* Check A bit */
 746        r = locomo_readl(mapbase + LOCOMO_DAC);
 747        r &=  ~(LOCOMO_DAC_SCLOEB);
 748        locomo_writel(r, mapbase + LOCOMO_DAC);
 749        udelay(DAC_LOW_SETUP_TIME);     /* 300 nsec */
 750        udelay(DAC_SCL_LOW_HOLD_TIME);  /* 4.7 usec */
 751        r = locomo_readl(mapbase + LOCOMO_DAC);
 752        r &=  ~(LOCOMO_DAC_SDAOEB);
 753        locomo_writel(r, mapbase + LOCOMO_DAC);
 754        udelay(DAC_LOW_SETUP_TIME);     /* 300 nsec */
 755        r = locomo_readl(mapbase + LOCOMO_DAC);
 756        r |=  LOCOMO_DAC_SCLOEB;
 757        locomo_writel(r, mapbase + LOCOMO_DAC);
 758        udelay(DAC_HIGH_SETUP_TIME);    /* 1000 nsec */
 759        udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4.7 usec */
 760        if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) {   /* High is error */
 761                printk(KERN_WARNING "locomo: m62332_senddata Error 3\n");
 762        }
 763
 764out:
 765        /* stop */
 766        r = locomo_readl(mapbase + LOCOMO_DAC);
 767        r &=  ~(LOCOMO_DAC_SCLOEB);
 768        locomo_writel(r, mapbase + LOCOMO_DAC);
 769        udelay(DAC_LOW_SETUP_TIME);     /* 300 nsec */
 770        udelay(DAC_SCL_LOW_HOLD_TIME);  /* 4.7 usec */
 771        r = locomo_readl(mapbase + LOCOMO_DAC);
 772        r |=  LOCOMO_DAC_SCLOEB;
 773        locomo_writel(r, mapbase + LOCOMO_DAC);
 774        udelay(DAC_HIGH_SETUP_TIME);    /* 1000 nsec */
 775        udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4 usec */
 776        r = locomo_readl(mapbase + LOCOMO_DAC);
 777        r |=  LOCOMO_DAC_SDAOEB;
 778        locomo_writel(r, mapbase + LOCOMO_DAC);
 779        udelay(DAC_HIGH_SETUP_TIME);    /* 1000 nsec */
 780        udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4 usec */
 781
 782        r = locomo_readl(mapbase + LOCOMO_DAC);
 783        r |=  LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
 784        locomo_writel(r, mapbase + LOCOMO_DAC);
 785        udelay(DAC_LOW_SETUP_TIME);     /* 1000 nsec */
 786        udelay(DAC_SCL_LOW_HOLD_TIME);  /* 4.7 usec */
 787
 788        spin_unlock_irqrestore(&lchip->lock, flags);
 789}
 790EXPORT_SYMBOL(locomo_m62332_senddata);
 791
 792/*
 793 *      Frontlight control
 794 */
 795
 796void locomo_frontlight_set(struct locomo_dev *dev, int duty, int vr, int bpwf)
 797{
 798        unsigned long flags;
 799        struct locomo *lchip = locomo_chip_driver(dev);
 800
 801        if (vr)
 802                locomo_gpio_write(dev->dev.parent, LOCOMO_GPIO_FL_VR, 1);
 803        else
 804                locomo_gpio_write(dev->dev.parent, LOCOMO_GPIO_FL_VR, 0);
 805
 806        spin_lock_irqsave(&lchip->lock, flags);
 807        locomo_writel(bpwf, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
 808        udelay(100);
 809        locomo_writel(duty, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALD);
 810        locomo_writel(bpwf | LOCOMO_ALC_EN, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
 811        spin_unlock_irqrestore(&lchip->lock, flags);
 812}
 813EXPORT_SYMBOL(locomo_frontlight_set);
 814
 815/*
 816 *      LoCoMo "Register Access Bus."
 817 *
 818 *      We model this as a regular bus type, and hang devices directly
 819 *      off this.
 820 */
 821static int locomo_match(struct device *_dev, struct device_driver *_drv)
 822{
 823        struct locomo_dev *dev = LOCOMO_DEV(_dev);
 824        struct locomo_driver *drv = LOCOMO_DRV(_drv);
 825
 826        return dev->devid == drv->devid;
 827}
 828
 829static int locomo_bus_probe(struct device *dev)
 830{
 831        struct locomo_dev *ldev = LOCOMO_DEV(dev);
 832        struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
 833        int ret = -ENODEV;
 834
 835        if (drv->probe)
 836                ret = drv->probe(ldev);
 837        return ret;
 838}
 839
 840static int locomo_bus_remove(struct device *dev)
 841{
 842        struct locomo_dev *ldev = LOCOMO_DEV(dev);
 843        struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
 844        int ret = 0;
 845
 846        if (drv->remove)
 847                ret = drv->remove(ldev);
 848        return ret;
 849}
 850
 851struct bus_type locomo_bus_type = {
 852        .name           = "locomo-bus",
 853        .match          = locomo_match,
 854        .probe          = locomo_bus_probe,
 855        .remove         = locomo_bus_remove,
 856};
 857
 858int locomo_driver_register(struct locomo_driver *driver)
 859{
 860        driver->drv.bus = &locomo_bus_type;
 861        return driver_register(&driver->drv);
 862}
 863EXPORT_SYMBOL(locomo_driver_register);
 864
 865void locomo_driver_unregister(struct locomo_driver *driver)
 866{
 867        driver_unregister(&driver->drv);
 868}
 869EXPORT_SYMBOL(locomo_driver_unregister);
 870
 871static int __init locomo_init(void)
 872{
 873        int ret = bus_register(&locomo_bus_type);
 874        if (ret == 0)
 875                platform_driver_register(&locomo_device_driver);
 876        return ret;
 877}
 878
 879static void __exit locomo_exit(void)
 880{
 881        platform_driver_unregister(&locomo_device_driver);
 882        bus_unregister(&locomo_bus_type);
 883}
 884
 885module_init(locomo_init);
 886module_exit(locomo_exit);
 887
 888MODULE_DESCRIPTION("Sharp LoCoMo core driver");
 889MODULE_LICENSE("GPL");
 890MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>");
 891