arch/arm/common/locomo.c

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This source file includes following definitions.
locomo_handler
locomo_ack_irq
locomo_mask_irq
locomo_unmask_irq
locomo_setup_irq
locomo_dev_release
locomo_init_one_child
locomo_suspend
locomo_resume
__locomo_probe
locomo_remove_child
__locomo_remove
locomo_probe
locomo_remove
locomo_chip_driver
locomo_gpio_set_dir
locomo_gpio_read_level
locomo_gpio_read_output
locomo_gpio_write
locomo_m62332_sendbit
locomo_m62332_senddata
locomo_frontlight_set
locomo_match
locomo_bus_probe
locomo_bus_remove
locomo_driver_register
locomo_driver_unregister
locomo_init
locomo_exit
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * linux/arch/arm/common/locomo.c
   4  *
   5  * Sharp LoCoMo support
   6  *
   7  * This file contains all generic LoCoMo support.
   8  *
   9  * All initialization functions provided here are intended to be called
  10  * from machine specific code with proper arguments when required.
  11  *
  12  * Based on sa1111.c
  13  */
  14 
  15 #include <linux/module.h>
  16 #include <linux/init.h>
  17 #include <linux/kernel.h>
  18 #include <linux/delay.h>
  19 #include <linux/errno.h>
  20 #include <linux/ioport.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/slab.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/io.h>
  25 
  26 #include <mach/hardware.h>
  27 #include <asm/irq.h>
  28 #include <asm/mach/irq.h>
  29 
  30 #include <asm/hardware/locomo.h>
  31 
  32 /* LoCoMo Interrupts */
  33 #define IRQ_LOCOMO_KEY          (0)
  34 #define IRQ_LOCOMO_GPIO         (1)
  35 #define IRQ_LOCOMO_LT           (2)
  36 #define IRQ_LOCOMO_SPI          (3)
  37 
  38 /* M62332 output channel selection */
  39 #define M62332_EVR_CH   1       /* M62332 volume channel number  */
  40                                 /*   0 : CH.1 , 1 : CH. 2        */
  41 /* DAC send data */
  42 #define M62332_SLAVE_ADDR       0x4e    /* Slave address  */
  43 #define M62332_W_BIT            0x00    /* W bit (0 only) */
  44 #define M62332_SUB_ADDR         0x00    /* Sub address    */
  45 #define M62332_A_BIT            0x00    /* A bit (0 only) */
  46 
  47 /* DAC setup and hold times (expressed in us) */
  48 #define DAC_BUS_FREE_TIME       5       /*   4.7 us */
  49 #define DAC_START_SETUP_TIME    5       /*   4.7 us */
  50 #define DAC_STOP_SETUP_TIME     4       /*   4.0 us */
  51 #define DAC_START_HOLD_TIME     5       /*   4.7 us */
  52 #define DAC_SCL_LOW_HOLD_TIME   5       /*   4.7 us */
  53 #define DAC_SCL_HIGH_HOLD_TIME  4       /*   4.0 us */
  54 #define DAC_DATA_SETUP_TIME     1       /*   250 ns */
  55 #define DAC_DATA_HOLD_TIME      1       /*   300 ns */
  56 #define DAC_LOW_SETUP_TIME      1       /*   300 ns */
  57 #define DAC_HIGH_SETUP_TIME     1       /*  1000 ns */
  58 
  59 /* the following is the overall data for the locomo chip */
  60 struct locomo {
  61         struct device *dev;
  62         unsigned long phys;
  63         unsigned int irq;
  64         int irq_base;
  65         spinlock_t lock;
  66         void __iomem *base;
  67 #ifdef CONFIG_PM
  68         void *saved_state;
  69 #endif
  70 };
  71 
  72 struct locomo_dev_info {
  73         unsigned long   offset;
  74         unsigned long   length;
  75         unsigned int    devid;
  76         unsigned int    irq[1];
  77         const char *    name;
  78 };
  79 
  80 /* All the locomo devices.  If offset is non-zero, the mapbase for the
  81  * locomo_dev will be set to the chip base plus offset.  If offset is
  82  * zero, then the mapbase for the locomo_dev will be set to zero.  An
  83  * offset of zero means the device only uses GPIOs or other helper
  84  * functions inside this file */
  85 static struct locomo_dev_info locomo_devices[] = {
  86         {
  87                 .devid          = LOCOMO_DEVID_KEYBOARD,
  88                 .irq            = { IRQ_LOCOMO_KEY },
  89                 .name           = "locomo-keyboard",
  90                 .offset         = LOCOMO_KEYBOARD,
  91                 .length         = 16,
  92         },
  93         {
  94                 .devid          = LOCOMO_DEVID_FRONTLIGHT,
  95                 .irq            = {},
  96                 .name           = "locomo-frontlight",
  97                 .offset         = LOCOMO_FRONTLIGHT,
  98                 .length         = 8,
  99 
 100         },
 101         {
 102                 .devid          = LOCOMO_DEVID_BACKLIGHT,
 103                 .irq            = {},
 104                 .name           = "locomo-backlight",
 105                 .offset         = LOCOMO_BACKLIGHT,
 106                 .length         = 8,
 107         },
 108         {
 109                 .devid          = LOCOMO_DEVID_AUDIO,
 110                 .irq            = {},
 111                 .name           = "locomo-audio",
 112                 .offset         = LOCOMO_AUDIO,
 113                 .length         = 4,
 114         },
 115         {
 116                 .devid          = LOCOMO_DEVID_LED,
 117                 .irq            = {},
 118                 .name           = "locomo-led",
 119                 .offset         = LOCOMO_LED,
 120                 .length         = 8,
 121         },
 122         {
 123                 .devid          = LOCOMO_DEVID_UART,
 124                 .irq            = {},
 125                 .name           = "locomo-uart",
 126                 .offset         = 0,
 127                 .length         = 0,
 128         },
 129         {
 130                 .devid          = LOCOMO_DEVID_SPI,
 131                 .irq            = {},
 132                 .name           = "locomo-spi",
 133                 .offset         = LOCOMO_SPI,
 134                 .length         = 0x30,
 135         },
 136 };
 137 
 138 static void locomo_handler(struct irq_desc *desc)
 139 {
 140         struct locomo *lchip = irq_desc_get_handler_data(desc);
 141         int req, i;
 142 
 143         /* Acknowledge the parent IRQ */
 144         desc->irq_data.chip->irq_ack(&desc->irq_data);
 145 
 146         /* check why this interrupt was generated */
 147         req = locomo_readl(lchip->base + LOCOMO_ICR) & 0x0f00;
 148 
 149         if (req) {
 150                 unsigned int irq;
 151 
 152                 /* generate the next interrupt(s) */
 153                 irq = lchip->irq_base;
 154                 for (i = 0; i <= 3; i++, irq++) {
 155                         if (req & (0x0100 << i)) {
 156                                 generic_handle_irq(irq);
 157                         }
 158 
 159                 }
 160         }
 161 }
 162 
 163 static void locomo_ack_irq(struct irq_data *d)
 164 {
 165 }
 166 
 167 static void locomo_mask_irq(struct irq_data *d)
 168 {
 169         struct locomo *lchip = irq_data_get_irq_chip_data(d);
 170         unsigned int r;
 171         r = locomo_readl(lchip->base + LOCOMO_ICR);
 172         r &= ~(0x0010 << (d->irq - lchip->irq_base));
 173         locomo_writel(r, lchip->base + LOCOMO_ICR);
 174 }
 175 
 176 static void locomo_unmask_irq(struct irq_data *d)
 177 {
 178         struct locomo *lchip = irq_data_get_irq_chip_data(d);
 179         unsigned int r;
 180         r = locomo_readl(lchip->base + LOCOMO_ICR);
 181         r |= (0x0010 << (d->irq - lchip->irq_base));
 182         locomo_writel(r, lchip->base + LOCOMO_ICR);
 183 }
 184 
 185 static struct irq_chip locomo_chip = {
 186         .name           = "LOCOMO",
 187         .irq_ack        = locomo_ack_irq,
 188         .irq_mask       = locomo_mask_irq,
 189         .irq_unmask     = locomo_unmask_irq,
 190 };
 191 
 192 static void locomo_setup_irq(struct locomo *lchip)
 193 {
 194         int irq = lchip->irq_base;
 195 
 196         /*
 197          * Install handler for IRQ_LOCOMO_HW.
 198          */
 199         irq_set_irq_type(lchip->irq, IRQ_TYPE_EDGE_FALLING);
 200         irq_set_chained_handler_and_data(lchip->irq, locomo_handler, lchip);
 201 
 202         /* Install handlers for IRQ_LOCOMO_* */
 203         for ( ; irq <= lchip->irq_base + 3; irq++) {
 204                 irq_set_chip_and_handler(irq, &locomo_chip, handle_level_irq);
 205                 irq_set_chip_data(irq, lchip);
 206                 irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE);
 207         }
 208 }
 209 
 210 
 211 static void locomo_dev_release(struct device *_dev)
 212 {
 213         struct locomo_dev *dev = LOCOMO_DEV(_dev);
 214 
 215         kfree(dev);
 216 }
 217 
 218 static int
 219 locomo_init_one_child(struct locomo *lchip, struct locomo_dev_info *info)
 220 {
 221         struct locomo_dev *dev;
 222         int ret;
 223 
 224         dev = kzalloc(sizeof(struct locomo_dev), GFP_KERNEL);
 225         if (!dev) {
 226                 ret = -ENOMEM;
 227                 goto out;
 228         }
 229 
 230         /*
 231          * If the parent device has a DMA mask associated with it,
 232          * propagate it down to the children.
 233          */
 234         if (lchip->dev->dma_mask) {
 235                 dev->dma_mask = *lchip->dev->dma_mask;
 236                 dev->dev.dma_mask = &dev->dma_mask;
 237         }
 238 
 239         dev_set_name(&dev->dev, "%s", info->name);
 240         dev->devid       = info->devid;
 241         dev->dev.parent  = lchip->dev;
 242         dev->dev.bus     = &locomo_bus_type;
 243         dev->dev.release = locomo_dev_release;
 244         dev->dev.coherent_dma_mask = lchip->dev->coherent_dma_mask;
 245 
 246         if (info->offset)
 247                 dev->mapbase = lchip->base + info->offset;
 248         else
 249                 dev->mapbase = 0;
 250         dev->length = info->length;
 251 
 252         dev->irq[0] = (lchip->irq_base == NO_IRQ) ?
 253                         NO_IRQ : lchip->irq_base + info->irq[0];
 254 
 255         ret = device_register(&dev->dev);
 256         if (ret) {
 257  out:
 258                 kfree(dev);
 259         }
 260         return ret;
 261 }
 262 
 263 #ifdef CONFIG_PM
 264 
 265 struct locomo_save_data {
 266         u16     LCM_GPO;
 267         u16     LCM_SPICT;
 268         u16     LCM_GPE;
 269         u16     LCM_ASD;
 270         u16     LCM_SPIMD;
 271 };
 272 
 273 static int locomo_suspend(struct platform_device *dev, pm_message_t state)
 274 {
 275         struct locomo *lchip = platform_get_drvdata(dev);
 276         struct locomo_save_data *save;
 277         unsigned long flags;
 278 
 279         save = kmalloc(sizeof(struct locomo_save_data), GFP_KERNEL);
 280         if (!save)
 281                 return -ENOMEM;
 282 
 283         lchip->saved_state = save;
 284 
 285         spin_lock_irqsave(&lchip->lock, flags);
 286 
 287         save->LCM_GPO     = locomo_readl(lchip->base + LOCOMO_GPO);     /* GPIO */
 288         locomo_writel(0x00, lchip->base + LOCOMO_GPO);
 289         save->LCM_SPICT   = locomo_readl(lchip->base + LOCOMO_SPI + LOCOMO_SPICT);      /* SPI */
 290         locomo_writel(0x40, lchip->base + LOCOMO_SPI + LOCOMO_SPICT);
 291         save->LCM_GPE     = locomo_readl(lchip->base + LOCOMO_GPE);     /* GPIO */
 292         locomo_writel(0x00, lchip->base + LOCOMO_GPE);
 293         save->LCM_ASD     = locomo_readl(lchip->base + LOCOMO_ASD);     /* ADSTART */
 294         locomo_writel(0x00, lchip->base + LOCOMO_ASD);
 295         save->LCM_SPIMD   = locomo_readl(lchip->base + LOCOMO_SPI + LOCOMO_SPIMD);      /* SPI */
 296         locomo_writel(0x3C14, lchip->base + LOCOMO_SPI + LOCOMO_SPIMD);
 297 
 298         locomo_writel(0x00, lchip->base + LOCOMO_PAIF);
 299         locomo_writel(0x00, lchip->base + LOCOMO_DAC);
 300         locomo_writel(0x00, lchip->base + LOCOMO_BACKLIGHT + LOCOMO_TC);
 301 
 302         if ((locomo_readl(lchip->base + LOCOMO_LED + LOCOMO_LPT0) & 0x88) && (locomo_readl(lchip->base + LOCOMO_LED + LOCOMO_LPT1) & 0x88))
 303                 locomo_writel(0x00, lchip->base + LOCOMO_C32K);         /* CLK32 off */
 304         else
 305                 /* 18MHz already enabled, so no wait */
 306                 locomo_writel(0xc1, lchip->base + LOCOMO_C32K);         /* CLK32 on */
 307 
 308         locomo_writel(0x00, lchip->base + LOCOMO_TADC);         /* 18MHz clock off*/
 309         locomo_writel(0x00, lchip->base + LOCOMO_AUDIO + LOCOMO_ACC);                   /* 22MHz/24MHz clock off */
 310         locomo_writel(0x00, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);                      /* FL */
 311 
 312         spin_unlock_irqrestore(&lchip->lock, flags);
 313 
 314         return 0;
 315 }
 316 
 317 static int locomo_resume(struct platform_device *dev)
 318 {
 319         struct locomo *lchip = platform_get_drvdata(dev);
 320         struct locomo_save_data *save;
 321         unsigned long r;
 322         unsigned long flags;
 323 
 324         save = lchip->saved_state;
 325         if (!save)
 326                 return 0;
 327 
 328         spin_lock_irqsave(&lchip->lock, flags);
 329 
 330         locomo_writel(save->LCM_GPO, lchip->base + LOCOMO_GPO);
 331         locomo_writel(save->LCM_SPICT, lchip->base + LOCOMO_SPI + LOCOMO_SPICT);
 332         locomo_writel(save->LCM_GPE, lchip->base + LOCOMO_GPE);
 333         locomo_writel(save->LCM_ASD, lchip->base + LOCOMO_ASD);
 334         locomo_writel(save->LCM_SPIMD, lchip->base + LOCOMO_SPI + LOCOMO_SPIMD);
 335 
 336         locomo_writel(0x00, lchip->base + LOCOMO_C32K);
 337         locomo_writel(0x90, lchip->base + LOCOMO_TADC);
 338 
 339         locomo_writel(0, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KSC);
 340         r = locomo_readl(lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
 341         r &= 0xFEFF;
 342         locomo_writel(r, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
 343         locomo_writel(0x1, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KCMD);
 344 
 345         spin_unlock_irqrestore(&lchip->lock, flags);
 346 
 347         lchip->saved_state = NULL;
 348         kfree(save);
 349 
 350         return 0;
 351 }
 352 #endif
 353 
 354 
 355 /**
 356  *      locomo_probe - probe for a single LoCoMo chip.
 357  *      @phys_addr: physical address of device.
 358  *
 359  *      Probe for a LoCoMo chip.  This must be called
 360  *      before any other locomo-specific code.
 361  *
 362  *      Returns:
 363  *      %-ENODEV        device not found.
 364  *      %-EBUSY         physical address already marked in-use.
 365  *      %0              successful.
 366  */
 367 static int
 368 __locomo_probe(struct device *me, struct resource *mem, int irq)
 369 {
 370         struct locomo_platform_data *pdata = me->platform_data;
 371         struct locomo *lchip;
 372         unsigned long r;
 373         int i, ret = -ENODEV;
 374 
 375         lchip = kzalloc(sizeof(struct locomo), GFP_KERNEL);
 376         if (!lchip)
 377                 return -ENOMEM;
 378 
 379         spin_lock_init(&lchip->lock);
 380 
 381         lchip->dev = me;
 382         dev_set_drvdata(lchip->dev, lchip);
 383 
 384         lchip->phys = mem->start;
 385         lchip->irq = irq;
 386         lchip->irq_base = (pdata) ? pdata->irq_base : NO_IRQ;
 387 
 388         /*
 389          * Map the whole region.  This also maps the
 390          * registers for our children.
 391          */
 392         lchip->base = ioremap(mem->start, PAGE_SIZE);
 393         if (!lchip->base) {
 394                 ret = -ENOMEM;
 395                 goto out;
 396         }
 397 
 398         /* locomo initialize */
 399         locomo_writel(0, lchip->base + LOCOMO_ICR);
 400         /* KEYBOARD */
 401         locomo_writel(0, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
 402 
 403         /* GPIO */
 404         locomo_writel(0, lchip->base + LOCOMO_GPO);
 405         locomo_writel((LOCOMO_GPIO(1) | LOCOMO_GPIO(2) | LOCOMO_GPIO(13) | LOCOMO_GPIO(14))
 406                         , lchip->base + LOCOMO_GPE);
 407         locomo_writel((LOCOMO_GPIO(1) | LOCOMO_GPIO(2) | LOCOMO_GPIO(13) | LOCOMO_GPIO(14))
 408                         , lchip->base + LOCOMO_GPD);
 409         locomo_writel(0, lchip->base + LOCOMO_GIE);
 410 
 411         /* Frontlight */
 412         locomo_writel(0, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
 413         locomo_writel(0, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALD);
 414 
 415         /* Longtime timer */
 416         locomo_writel(0, lchip->base + LOCOMO_LTINT);
 417         /* SPI */
 418         locomo_writel(0, lchip->base + LOCOMO_SPI + LOCOMO_SPIIE);
 419 
 420         locomo_writel(6 + 8 + 320 + 30 - 10, lchip->base + LOCOMO_ASD);
 421         r = locomo_readl(lchip->base + LOCOMO_ASD);
 422         r |= 0x8000;
 423         locomo_writel(r, lchip->base + LOCOMO_ASD);
 424 
 425         locomo_writel(6 + 8 + 320 + 30 - 10 - 128 + 4, lchip->base + LOCOMO_HSD);
 426         r = locomo_readl(lchip->base + LOCOMO_HSD);
 427         r |= 0x8000;
 428         locomo_writel(r, lchip->base + LOCOMO_HSD);
 429 
 430         locomo_writel(128 / 8, lchip->base + LOCOMO_HSC);
 431 
 432         /* XON */
 433         locomo_writel(0x80, lchip->base + LOCOMO_TADC);
 434         udelay(1000);
 435         /* CLK9MEN */
 436         r = locomo_readl(lchip->base + LOCOMO_TADC);
 437         r |= 0x10;
 438         locomo_writel(r, lchip->base + LOCOMO_TADC);
 439         udelay(100);
 440 
 441         /* init DAC */
 442         r = locomo_readl(lchip->base + LOCOMO_DAC);
 443         r |= LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
 444         locomo_writel(r, lchip->base + LOCOMO_DAC);
 445 
 446         r = locomo_readl(lchip->base + LOCOMO_VER);
 447         printk(KERN_INFO "LoCoMo Chip: %lu%lu\n", (r >> 8), (r & 0xff));
 448 
 449         /*
 450          * The interrupt controller must be initialised before any
 451          * other device to ensure that the interrupts are available.
 452          */
 453         if (lchip->irq != NO_IRQ && lchip->irq_base != NO_IRQ)
 454                 locomo_setup_irq(lchip);
 455 
 456         for (i = 0; i < ARRAY_SIZE(locomo_devices); i++)
 457                 locomo_init_one_child(lchip, &locomo_devices[i]);
 458         return 0;
 459 
 460  out:
 461         kfree(lchip);
 462         return ret;
 463 }
 464 
 465 static int locomo_remove_child(struct device *dev, void *data)
 466 {
 467         device_unregister(dev);
 468         return 0;
 469 } 
 470 
 471 static void __locomo_remove(struct locomo *lchip)
 472 {
 473         device_for_each_child(lchip->dev, NULL, locomo_remove_child);
 474 
 475         if (lchip->irq != NO_IRQ) {
 476                 irq_set_chained_handler_and_data(lchip->irq, NULL, NULL);
 477         }
 478 
 479         iounmap(lchip->base);
 480         kfree(lchip);
 481 }
 482 
 483 static int locomo_probe(struct platform_device *dev)
 484 {
 485         struct resource *mem;
 486         int irq;
 487 
 488         mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
 489         if (!mem)
 490                 return -EINVAL;
 491         irq = platform_get_irq(dev, 0);
 492         if (irq < 0)
 493                 return -ENXIO;
 494 
 495         return __locomo_probe(&dev->dev, mem, irq);
 496 }
 497 
 498 static int locomo_remove(struct platform_device *dev)
 499 {
 500         struct locomo *lchip = platform_get_drvdata(dev);
 501 
 502         if (lchip) {
 503                 __locomo_remove(lchip);
 504                 platform_set_drvdata(dev, NULL);
 505         }
 506 
 507         return 0;
 508 }
 509 
 510 /*
 511  *      Not sure if this should be on the system bus or not yet.
 512  *      We really want some way to register a system device at
 513  *      the per-machine level, and then have this driver pick
 514  *      up the registered devices.
 515  */
 516 static struct platform_driver locomo_device_driver = {
 517         .probe          = locomo_probe,
 518         .remove         = locomo_remove,
 519 #ifdef CONFIG_PM
 520         .suspend        = locomo_suspend,
 521         .resume         = locomo_resume,
 522 #endif
 523         .driver         = {
 524                 .name   = "locomo",
 525         },
 526 };
 527 
 528 /*
 529  *      Get the parent device driver (us) structure
 530  *      from a child function device
 531  */
 532 static inline struct locomo *locomo_chip_driver(struct locomo_dev *ldev)
 533 {
 534         return (struct locomo *)dev_get_drvdata(ldev->dev.parent);
 535 }
 536 
 537 void locomo_gpio_set_dir(struct device *dev, unsigned int bits, unsigned int dir)
 538 {
 539         struct locomo *lchip = dev_get_drvdata(dev);
 540         unsigned long flags;
 541         unsigned int r;
 542 
 543         if (!lchip)
 544                 return;
 545 
 546         spin_lock_irqsave(&lchip->lock, flags);
 547 
 548         r = locomo_readl(lchip->base + LOCOMO_GPD);
 549         if (dir)
 550                 r |= bits;
 551         else
 552                 r &= ~bits;
 553         locomo_writel(r, lchip->base + LOCOMO_GPD);
 554 
 555         r = locomo_readl(lchip->base + LOCOMO_GPE);
 556         if (dir)
 557                 r |= bits;
 558         else
 559                 r &= ~bits;
 560         locomo_writel(r, lchip->base + LOCOMO_GPE);
 561 
 562         spin_unlock_irqrestore(&lchip->lock, flags);
 563 }
 564 EXPORT_SYMBOL(locomo_gpio_set_dir);
 565 
 566 int locomo_gpio_read_level(struct device *dev, unsigned int bits)
 567 {
 568         struct locomo *lchip = dev_get_drvdata(dev);
 569         unsigned long flags;
 570         unsigned int ret;
 571 
 572         if (!lchip)
 573                 return -ENODEV;
 574 
 575         spin_lock_irqsave(&lchip->lock, flags);
 576         ret = locomo_readl(lchip->base + LOCOMO_GPL);
 577         spin_unlock_irqrestore(&lchip->lock, flags);
 578 
 579         ret &= bits;
 580         return ret;
 581 }
 582 EXPORT_SYMBOL(locomo_gpio_read_level);
 583 
 584 int locomo_gpio_read_output(struct device *dev, unsigned int bits)
 585 {
 586         struct locomo *lchip = dev_get_drvdata(dev);
 587         unsigned long flags;
 588         unsigned int ret;
 589 
 590         if (!lchip)
 591                 return -ENODEV;
 592 
 593         spin_lock_irqsave(&lchip->lock, flags);
 594         ret = locomo_readl(lchip->base + LOCOMO_GPO);
 595         spin_unlock_irqrestore(&lchip->lock, flags);
 596 
 597         ret &= bits;
 598         return ret;
 599 }
 600 EXPORT_SYMBOL(locomo_gpio_read_output);
 601 
 602 void locomo_gpio_write(struct device *dev, unsigned int bits, unsigned int set)
 603 {
 604         struct locomo *lchip = dev_get_drvdata(dev);
 605         unsigned long flags;
 606         unsigned int r;
 607 
 608         if (!lchip)
 609                 return;
 610 
 611         spin_lock_irqsave(&lchip->lock, flags);
 612 
 613         r = locomo_readl(lchip->base + LOCOMO_GPO);
 614         if (set)
 615                 r |= bits;
 616         else
 617                 r &= ~bits;
 618         locomo_writel(r, lchip->base + LOCOMO_GPO);
 619 
 620         spin_unlock_irqrestore(&lchip->lock, flags);
 621 }
 622 EXPORT_SYMBOL(locomo_gpio_write);
 623 
 624 static void locomo_m62332_sendbit(void *mapbase, int bit)
 625 {
 626         unsigned int r;
 627 
 628         r = locomo_readl(mapbase + LOCOMO_DAC);
 629         r &=  ~(LOCOMO_DAC_SCLOEB);
 630         locomo_writel(r, mapbase + LOCOMO_DAC);
 631         udelay(DAC_LOW_SETUP_TIME);     /* 300 nsec */
 632         udelay(DAC_DATA_HOLD_TIME);     /* 300 nsec */
 633         r = locomo_readl(mapbase + LOCOMO_DAC);
 634         r &=  ~(LOCOMO_DAC_SCLOEB);
 635         locomo_writel(r, mapbase + LOCOMO_DAC);
 636         udelay(DAC_LOW_SETUP_TIME);     /* 300 nsec */
 637         udelay(DAC_SCL_LOW_HOLD_TIME);  /* 4.7 usec */
 638 
 639         if (bit & 1) {
 640                 r = locomo_readl(mapbase + LOCOMO_DAC);
 641                 r |=  LOCOMO_DAC_SDAOEB;
 642                 locomo_writel(r, mapbase + LOCOMO_DAC);
 643                 udelay(DAC_HIGH_SETUP_TIME);    /* 1000 nsec */
 644         } else {
 645                 r = locomo_readl(mapbase + LOCOMO_DAC);
 646                 r &=  ~(LOCOMO_DAC_SDAOEB);
 647                 locomo_writel(r, mapbase + LOCOMO_DAC);
 648                 udelay(DAC_LOW_SETUP_TIME);     /* 300 nsec */
 649         }
 650 
 651         udelay(DAC_DATA_SETUP_TIME);    /* 250 nsec */
 652         r = locomo_readl(mapbase + LOCOMO_DAC);
 653         r |=  LOCOMO_DAC_SCLOEB;
 654         locomo_writel(r, mapbase + LOCOMO_DAC);
 655         udelay(DAC_HIGH_SETUP_TIME);    /* 1000 nsec */
 656         udelay(DAC_SCL_HIGH_HOLD_TIME); /*  4.0 usec */
 657 }
 658 
 659 void locomo_m62332_senddata(struct locomo_dev *ldev, unsigned int dac_data, int channel)
 660 {
 661         struct locomo *lchip = locomo_chip_driver(ldev);
 662         int i;
 663         unsigned char data;
 664         unsigned int r;
 665         void *mapbase = lchip->base;
 666         unsigned long flags;
 667 
 668         spin_lock_irqsave(&lchip->lock, flags);
 669 
 670         /* Start */
 671         udelay(DAC_BUS_FREE_TIME);      /* 5.0 usec */
 672         r = locomo_readl(mapbase + LOCOMO_DAC);
 673         r |=  LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
 674         locomo_writel(r, mapbase + LOCOMO_DAC);
 675         udelay(DAC_HIGH_SETUP_TIME);    /* 1000 nsec */
 676         udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4.0 usec */
 677         r = locomo_readl(mapbase + LOCOMO_DAC);
 678         r &=  ~(LOCOMO_DAC_SDAOEB);
 679         locomo_writel(r, mapbase + LOCOMO_DAC);
 680         udelay(DAC_START_HOLD_TIME);    /* 5.0 usec */
 681         udelay(DAC_DATA_HOLD_TIME);     /* 300 nsec */
 682 
 683         /* Send slave address and W bit (LSB is W bit) */
 684         data = (M62332_SLAVE_ADDR << 1) | M62332_W_BIT;
 685         for (i = 1; i <= 8; i++) {
 686                 locomo_m62332_sendbit(mapbase, data >> (8 - i));
 687         }
 688 
 689         /* Check A bit */
 690         r = locomo_readl(mapbase + LOCOMO_DAC);
 691         r &=  ~(LOCOMO_DAC_SCLOEB);
 692         locomo_writel(r, mapbase + LOCOMO_DAC);
 693         udelay(DAC_LOW_SETUP_TIME);     /* 300 nsec */
 694         udelay(DAC_SCL_LOW_HOLD_TIME);  /* 4.7 usec */
 695         r = locomo_readl(mapbase + LOCOMO_DAC);
 696         r &=  ~(LOCOMO_DAC_SDAOEB);
 697         locomo_writel(r, mapbase + LOCOMO_DAC);
 698         udelay(DAC_LOW_SETUP_TIME);     /* 300 nsec */
 699         r = locomo_readl(mapbase + LOCOMO_DAC);
 700         r |=  LOCOMO_DAC_SCLOEB;
 701         locomo_writel(r, mapbase + LOCOMO_DAC);
 702         udelay(DAC_HIGH_SETUP_TIME);    /* 1000 nsec */
 703         udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4.7 usec */
 704         if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) {   /* High is error */
 705                 printk(KERN_WARNING "locomo: m62332_senddata Error 1\n");
 706                 goto out;
 707         }
 708 
 709         /* Send Sub address (LSB is channel select) */
 710         /*    channel = 0 : ch1 select              */
 711         /*            = 1 : ch2 select              */
 712         data = M62332_SUB_ADDR + channel;
 713         for (i = 1; i <= 8; i++) {
 714                 locomo_m62332_sendbit(mapbase, data >> (8 - i));
 715         }
 716 
 717         /* Check A bit */
 718         r = locomo_readl(mapbase + LOCOMO_DAC);
 719         r &=  ~(LOCOMO_DAC_SCLOEB);
 720         locomo_writel(r, mapbase + LOCOMO_DAC);
 721         udelay(DAC_LOW_SETUP_TIME);     /* 300 nsec */
 722         udelay(DAC_SCL_LOW_HOLD_TIME);  /* 4.7 usec */
 723         r = locomo_readl(mapbase + LOCOMO_DAC);
 724         r &=  ~(LOCOMO_DAC_SDAOEB);
 725         locomo_writel(r, mapbase + LOCOMO_DAC);
 726         udelay(DAC_LOW_SETUP_TIME);     /* 300 nsec */
 727         r = locomo_readl(mapbase + LOCOMO_DAC);
 728         r |=  LOCOMO_DAC_SCLOEB;
 729         locomo_writel(r, mapbase + LOCOMO_DAC);
 730         udelay(DAC_HIGH_SETUP_TIME);    /* 1000 nsec */
 731         udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4.7 usec */
 732         if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) {   /* High is error */
 733                 printk(KERN_WARNING "locomo: m62332_senddata Error 2\n");
 734                 goto out;
 735         }
 736 
 737         /* Send DAC data */
 738         for (i = 1; i <= 8; i++) {
 739                 locomo_m62332_sendbit(mapbase, dac_data >> (8 - i));
 740         }
 741 
 742         /* Check A bit */
 743         r = locomo_readl(mapbase + LOCOMO_DAC);
 744         r &=  ~(LOCOMO_DAC_SCLOEB);
 745         locomo_writel(r, mapbase + LOCOMO_DAC);
 746         udelay(DAC_LOW_SETUP_TIME);     /* 300 nsec */
 747         udelay(DAC_SCL_LOW_HOLD_TIME);  /* 4.7 usec */
 748         r = locomo_readl(mapbase + LOCOMO_DAC);
 749         r &=  ~(LOCOMO_DAC_SDAOEB);
 750         locomo_writel(r, mapbase + LOCOMO_DAC);
 751         udelay(DAC_LOW_SETUP_TIME);     /* 300 nsec */
 752         r = locomo_readl(mapbase + LOCOMO_DAC);
 753         r |=  LOCOMO_DAC_SCLOEB;
 754         locomo_writel(r, mapbase + LOCOMO_DAC);
 755         udelay(DAC_HIGH_SETUP_TIME);    /* 1000 nsec */
 756         udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4.7 usec */
 757         if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) {   /* High is error */
 758                 printk(KERN_WARNING "locomo: m62332_senddata Error 3\n");
 759         }
 760 
 761 out:
 762         /* stop */
 763         r = locomo_readl(mapbase + LOCOMO_DAC);
 764         r &=  ~(LOCOMO_DAC_SCLOEB);
 765         locomo_writel(r, mapbase + LOCOMO_DAC);
 766         udelay(DAC_LOW_SETUP_TIME);     /* 300 nsec */
 767         udelay(DAC_SCL_LOW_HOLD_TIME);  /* 4.7 usec */
 768         r = locomo_readl(mapbase + LOCOMO_DAC);
 769         r |=  LOCOMO_DAC_SCLOEB;
 770         locomo_writel(r, mapbase + LOCOMO_DAC);
 771         udelay(DAC_HIGH_SETUP_TIME);    /* 1000 nsec */
 772         udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4 usec */
 773         r = locomo_readl(mapbase + LOCOMO_DAC);
 774         r |=  LOCOMO_DAC_SDAOEB;
 775         locomo_writel(r, mapbase + LOCOMO_DAC);
 776         udelay(DAC_HIGH_SETUP_TIME);    /* 1000 nsec */
 777         udelay(DAC_SCL_HIGH_HOLD_TIME); /* 4 usec */
 778 
 779         r = locomo_readl(mapbase + LOCOMO_DAC);
 780         r |=  LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
 781         locomo_writel(r, mapbase + LOCOMO_DAC);
 782         udelay(DAC_LOW_SETUP_TIME);     /* 1000 nsec */
 783         udelay(DAC_SCL_LOW_HOLD_TIME);  /* 4.7 usec */
 784 
 785         spin_unlock_irqrestore(&lchip->lock, flags);
 786 }
 787 EXPORT_SYMBOL(locomo_m62332_senddata);
 788 
 789 /*
 790  *      Frontlight control
 791  */
 792 
 793 void locomo_frontlight_set(struct locomo_dev *dev, int duty, int vr, int bpwf)
 794 {
 795         unsigned long flags;
 796         struct locomo *lchip = locomo_chip_driver(dev);
 797 
 798         if (vr)
 799                 locomo_gpio_write(dev->dev.parent, LOCOMO_GPIO_FL_VR, 1);
 800         else
 801                 locomo_gpio_write(dev->dev.parent, LOCOMO_GPIO_FL_VR, 0);
 802 
 803         spin_lock_irqsave(&lchip->lock, flags);
 804         locomo_writel(bpwf, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
 805         udelay(100);
 806         locomo_writel(duty, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALD);
 807         locomo_writel(bpwf | LOCOMO_ALC_EN, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
 808         spin_unlock_irqrestore(&lchip->lock, flags);
 809 }
 810 EXPORT_SYMBOL(locomo_frontlight_set);
 811 
 812 /*
 813  *      LoCoMo "Register Access Bus."
 814  *
 815  *      We model this as a regular bus type, and hang devices directly
 816  *      off this.
 817  */
 818 static int locomo_match(struct device *_dev, struct device_driver *_drv)
 819 {
 820         struct locomo_dev *dev = LOCOMO_DEV(_dev);
 821         struct locomo_driver *drv = LOCOMO_DRV(_drv);
 822 
 823         return dev->devid == drv->devid;
 824 }
 825 
 826 static int locomo_bus_probe(struct device *dev)
 827 {
 828         struct locomo_dev *ldev = LOCOMO_DEV(dev);
 829         struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
 830         int ret = -ENODEV;
 831 
 832         if (drv->probe)
 833                 ret = drv->probe(ldev);
 834         return ret;
 835 }
 836 
 837 static int locomo_bus_remove(struct device *dev)
 838 {
 839         struct locomo_dev *ldev = LOCOMO_DEV(dev);
 840         struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
 841         int ret = 0;
 842 
 843         if (drv->remove)
 844                 ret = drv->remove(ldev);
 845         return ret;
 846 }
 847 
 848 struct bus_type locomo_bus_type = {
 849         .name           = "locomo-bus",
 850         .match          = locomo_match,
 851         .probe          = locomo_bus_probe,
 852         .remove         = locomo_bus_remove,
 853 };
 854 
 855 int locomo_driver_register(struct locomo_driver *driver)
 856 {
 857         driver->drv.bus = &locomo_bus_type;
 858         return driver_register(&driver->drv);
 859 }
 860 EXPORT_SYMBOL(locomo_driver_register);
 861 
 862 void locomo_driver_unregister(struct locomo_driver *driver)
 863 {
 864         driver_unregister(&driver->drv);
 865 }
 866 EXPORT_SYMBOL(locomo_driver_unregister);
 867 
 868 static int __init locomo_init(void)
 869 {
 870         int ret = bus_register(&locomo_bus_type);
 871         if (ret == 0)
 872                 platform_driver_register(&locomo_device_driver);
 873         return ret;
 874 }
 875 
 876 static void __exit locomo_exit(void)
 877 {
 878         platform_driver_unregister(&locomo_device_driver);
 879         bus_unregister(&locomo_bus_type);
 880 }
 881 
 882 module_init(locomo_init);
 883 module_exit(locomo_exit);
 884 
 885 MODULE_DESCRIPTION("Sharp LoCoMo core driver");
 886 MODULE_LICENSE("GPL");
 887 MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>");
/* [<][>][^][v][top][bottom][index][help] */
root/arch/arm/common/locomo.c

DEFINITIONS
