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locomo.c

/*
 * linux/arch/arm/common/locomo.c
 *
 * Sharp LoCoMo support
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This file contains all generic LoCoMo support.
 *
 * All initialization functions provided here are intended to be called
 * from machine specific code with proper arguments when required.
 *
 * Based on sa1111.c
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/io.h>

#include <mach/hardware.h>
#include <asm/irq.h>
#include <asm/mach/irq.h>

#include <asm/hardware/locomo.h>

/* M62332 output channel selection */
#define M62332_EVR_CH   1     /* M62332 volume channel number  */
                        /*   0 : CH.1 , 1 : CH. 2        */
/* DAC send data */
#define     M62332_SLAVE_ADDR 0x4e  /* Slave address  */
#define     M62332_W_BIT            0x00  /* W bit (0 only) */
#define     M62332_SUB_ADDR         0x00  /* Sub address    */
#define     M62332_A_BIT            0x00  /* A bit (0 only) */

/* DAC setup and hold times (expressed in us) */
#define DAC_BUS_FREE_TIME     5     /*   4.7 us */
#define DAC_START_SETUP_TIME  5     /*   4.7 us */
#define DAC_STOP_SETUP_TIME   4     /*   4.0 us */
#define DAC_START_HOLD_TIME   5     /*   4.7 us */
#define DAC_SCL_LOW_HOLD_TIME 5     /*   4.7 us */
#define DAC_SCL_HIGH_HOLD_TIME      4     /*   4.0 us */
#define DAC_DATA_SETUP_TIME   1     /*   250 ns */
#define DAC_DATA_HOLD_TIME    1     /*   300 ns */
#define DAC_LOW_SETUP_TIME    1     /*   300 ns */
#define DAC_HIGH_SETUP_TIME   1     /*  1000 ns */

/* the following is the overall data for the locomo chip */
00057 struct locomo {
      struct device *dev;
      unsigned long phys;
      unsigned int irq;
      spinlock_t lock;
      void __iomem *base;
#ifdef CONFIG_PM
      void *saved_state;
#endif
};

00068 struct locomo_dev_info {
      unsigned long     offset;
      unsigned long     length;
      unsigned int      devid;
      unsigned int      irq[1];
      const char *      name;
};

/* All the locomo devices.  If offset is non-zero, the mapbase for the
 * locomo_dev will be set to the chip base plus offset.  If offset is
 * zero, then the mapbase for the locomo_dev will be set to zero.  An
 * offset of zero means the device only uses GPIOs or other helper
 * functions inside this file */
static struct locomo_dev_info locomo_devices[] = {
      {
            .devid            = LOCOMO_DEVID_KEYBOARD,
            .irq = {
                  IRQ_LOCOMO_KEY,
            },
            .name       = "locomo-keyboard",
            .offset           = LOCOMO_KEYBOARD,
            .length           = 16,
      },
      {
            .devid            = LOCOMO_DEVID_FRONTLIGHT,
            .irq        = {},
            .name       = "locomo-frontlight",
            .offset           = LOCOMO_FRONTLIGHT,
            .length           = 8,

      },
      {
            .devid            = LOCOMO_DEVID_BACKLIGHT,
            .irq        = {},
            .name       = "locomo-backlight",
            .offset           = LOCOMO_BACKLIGHT,
            .length           = 8,
      },
      {
            .devid            = LOCOMO_DEVID_AUDIO,
            .irq        = {},
            .name       = "locomo-audio",
            .offset           = LOCOMO_AUDIO,
            .length           = 4,
      },
      {
            .devid            = LOCOMO_DEVID_LED,
            .irq        = {},
            .name       = "locomo-led",
            .offset           = LOCOMO_LED,
            .length           = 8,
      },
      {
            .devid            = LOCOMO_DEVID_UART,
            .irq        = {},
            .name       = "locomo-uart",
            .offset           = 0,
            .length           = 0,
      },
      {
            .devid            = LOCOMO_DEVID_SPI,
            .irq        = {},
            .name       = "locomo-spi",
            .offset           = LOCOMO_SPI,
            .length           = 0x30,
      },
};


/** LoCoMo interrupt handling stuff.
 * NOTE: LoCoMo has a 1 to many mapping on all of its IRQs.
 * that is, there is only one real hardware interrupt
 * we determine which interrupt it is by reading some IO memory.
 * We have two levels of expansion, first in the handler for the
 * hardware interrupt we generate an interrupt
 * IRQ_LOCOMO_*_BASE and those handlers generate more interrupts
 *
 * hardware irq reads LOCOMO_ICR & 0x0f00
 *   IRQ_LOCOMO_KEY_BASE
 *   IRQ_LOCOMO_GPIO_BASE
 *   IRQ_LOCOMO_LT_BASE
 *   IRQ_LOCOMO_SPI_BASE
 * IRQ_LOCOMO_KEY_BASE reads LOCOMO_KIC & 0x0001
 *   IRQ_LOCOMO_KEY
 * IRQ_LOCOMO_GPIO_BASE reads LOCOMO_GIR & LOCOMO_GPD & 0xffff
 *   IRQ_LOCOMO_GPIO[0-15]
 * IRQ_LOCOMO_LT_BASE reads LOCOMO_LTINT & 0x0001
 *   IRQ_LOCOMO_LT
 * IRQ_LOCOMO_SPI_BASE reads LOCOMO_SPIIR & 0x000F
 *   IRQ_LOCOMO_SPI_RFR
 *   IRQ_LOCOMO_SPI_RFW
 *   IRQ_LOCOMO_SPI_OVRN
 *   IRQ_LOCOMO_SPI_TEND
 */

#define LOCOMO_IRQ_START      (IRQ_LOCOMO_KEY_BASE)
#define LOCOMO_IRQ_KEY_START  (IRQ_LOCOMO_KEY)
#define     LOCOMO_IRQ_GPIO_START   (IRQ_LOCOMO_GPIO0)
#define     LOCOMO_IRQ_LT_START     (IRQ_LOCOMO_LT)
#define     LOCOMO_IRQ_SPI_START    (IRQ_LOCOMO_SPI_RFR)

static void locomo_handler(unsigned int irq, struct irq_desc *desc)
{
      int req, i;
      void __iomem *mapbase = get_irq_chip_data(irq);

      /* Acknowledge the parent IRQ */
      desc->chip->ack(irq);

      /* check why this interrupt was generated */
      req = locomo_readl(mapbase + LOCOMO_ICR) & 0x0f00;

      if (req) {
            /* generate the next interrupt(s) */
            irq = LOCOMO_IRQ_START;
            for (i = 0; i <= 3; i++, irq++) {
                  if (req & (0x0100 << i)) {
                        generic_handle_irq(irq);
                  }

            }
      }
}

static void locomo_ack_irq(unsigned int irq)
{
}

static void locomo_mask_irq(unsigned int irq)
{
      void __iomem *mapbase = get_irq_chip_data(irq);
      unsigned int r;
      r = locomo_readl(mapbase + LOCOMO_ICR);
      r &= ~(0x0010 << (irq - LOCOMO_IRQ_START));
      locomo_writel(r, mapbase + LOCOMO_ICR);
}

static void locomo_unmask_irq(unsigned int irq)
{
      void __iomem *mapbase = get_irq_chip_data(irq);
      unsigned int r;
      r = locomo_readl(mapbase + LOCOMO_ICR);
      r |= (0x0010 << (irq - LOCOMO_IRQ_START));
      locomo_writel(r, mapbase + LOCOMO_ICR);
}

static struct irq_chip locomo_chip = {
      .name = "LOCOMO",
      .ack  = locomo_ack_irq,
      .mask = locomo_mask_irq,
      .unmask     = locomo_unmask_irq,
};

static void locomo_key_handler(unsigned int irq, struct irq_desc *desc)
{
      void __iomem *mapbase = get_irq_chip_data(irq);

      if (locomo_readl(mapbase + LOCOMO_KEYBOARD + LOCOMO_KIC) & 0x0001) {
            generic_handle_irq(LOCOMO_IRQ_KEY_START);
      }
}

static void locomo_key_ack_irq(unsigned int irq)
{
      void __iomem *mapbase = get_irq_chip_data(irq);
      unsigned int r;
      r = locomo_readl(mapbase + LOCOMO_KEYBOARD + LOCOMO_KIC);
      r &= ~(0x0100 << (irq - LOCOMO_IRQ_KEY_START));
      locomo_writel(r, mapbase + LOCOMO_KEYBOARD + LOCOMO_KIC);
}

static void locomo_key_mask_irq(unsigned int irq)
{
      void __iomem *mapbase = get_irq_chip_data(irq);
      unsigned int r;
      r = locomo_readl(mapbase + LOCOMO_KEYBOARD + LOCOMO_KIC);
      r &= ~(0x0010 << (irq - LOCOMO_IRQ_KEY_START));
      locomo_writel(r, mapbase + LOCOMO_KEYBOARD + LOCOMO_KIC);
}

static void locomo_key_unmask_irq(unsigned int irq)
{
      void __iomem *mapbase = get_irq_chip_data(irq);
      unsigned int r;
      r = locomo_readl(mapbase + LOCOMO_KEYBOARD + LOCOMO_KIC);
      r |= (0x0010 << (irq - LOCOMO_IRQ_KEY_START));
      locomo_writel(r, mapbase + LOCOMO_KEYBOARD + LOCOMO_KIC);
}

static struct irq_chip locomo_key_chip = {
      .name = "LOCOMO-key",
      .ack  = locomo_key_ack_irq,
      .mask = locomo_key_mask_irq,
      .unmask     = locomo_key_unmask_irq,
};

static void locomo_gpio_handler(unsigned int irq, struct irq_desc *desc)
{
      int req, i;
      void __iomem *mapbase = get_irq_chip_data(irq);

      req =       locomo_readl(mapbase + LOCOMO_GIR) &
            locomo_readl(mapbase + LOCOMO_GPD) &
            0xffff;

      if (req) {
            irq = LOCOMO_IRQ_GPIO_START;
            for (i = 0; i <= 15; i++, irq++) {
                  if (req & (0x0001 << i)) {
                        generic_handle_irq(irq);
                  }
            }
      }
}

static void locomo_gpio_ack_irq(unsigned int irq)
{
      void __iomem *mapbase = get_irq_chip_data(irq);
      unsigned int r;
      r = locomo_readl(mapbase + LOCOMO_GWE);
      r |= (0x0001 << (irq - LOCOMO_IRQ_GPIO_START));
      locomo_writel(r, mapbase + LOCOMO_GWE);

      r = locomo_readl(mapbase + LOCOMO_GIS);
      r &= ~(0x0001 << (irq - LOCOMO_IRQ_GPIO_START));
      locomo_writel(r, mapbase + LOCOMO_GIS);

      r = locomo_readl(mapbase + LOCOMO_GWE);
      r &= ~(0x0001 << (irq - LOCOMO_IRQ_GPIO_START));
      locomo_writel(r, mapbase + LOCOMO_GWE);
}

static void locomo_gpio_mask_irq(unsigned int irq)
{
      void __iomem *mapbase = get_irq_chip_data(irq);
      unsigned int r;
      r = locomo_readl(mapbase + LOCOMO_GIE);
      r &= ~(0x0001 << (irq - LOCOMO_IRQ_GPIO_START));
      locomo_writel(r, mapbase + LOCOMO_GIE);
}

static void locomo_gpio_unmask_irq(unsigned int irq)
{
      void __iomem *mapbase = get_irq_chip_data(irq);
      unsigned int r;
      r = locomo_readl(mapbase + LOCOMO_GIE);
      r |= (0x0001 << (irq - LOCOMO_IRQ_GPIO_START));
      locomo_writel(r, mapbase + LOCOMO_GIE);
}

static int GPIO_IRQ_rising_edge;
static int GPIO_IRQ_falling_edge;

static int locomo_gpio_type(unsigned int irq, unsigned int type)
{
      unsigned int mask;
      void __iomem *mapbase = get_irq_chip_data(irq);

      mask = 1 << (irq - LOCOMO_IRQ_GPIO_START);

      if (type == IRQ_TYPE_PROBE) {
            if ((GPIO_IRQ_rising_edge | GPIO_IRQ_falling_edge) & mask)
                  return 0;
            type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
      }

      if (type & IRQ_TYPE_EDGE_RISING)
            GPIO_IRQ_rising_edge |= mask;
      else
            GPIO_IRQ_rising_edge &= ~mask;
      if (type & IRQ_TYPE_EDGE_FALLING)
            GPIO_IRQ_falling_edge |= mask;
      else
            GPIO_IRQ_falling_edge &= ~mask;
      locomo_writel(GPIO_IRQ_rising_edge, mapbase + LOCOMO_GRIE);
      locomo_writel(GPIO_IRQ_falling_edge, mapbase + LOCOMO_GFIE);

      return 0;
}

static struct irq_chip locomo_gpio_chip = {
      .name   = "LOCOMO-gpio",
      .ack    = locomo_gpio_ack_irq,
      .mask   = locomo_gpio_mask_irq,
      .unmask       = locomo_gpio_unmask_irq,
      .set_type = locomo_gpio_type,
};

static void locomo_lt_handler(unsigned int irq, struct irq_desc *desc)
{
      void __iomem *mapbase = get_irq_chip_data(irq);

      if (locomo_readl(mapbase + LOCOMO_LTINT) & 0x0001) {
            generic_handle_irq(LOCOMO_IRQ_LT_START);
      }
}

static void locomo_lt_ack_irq(unsigned int irq)
{
      void __iomem *mapbase = get_irq_chip_data(irq);
      unsigned int r;
      r = locomo_readl(mapbase + LOCOMO_LTINT);
      r &= ~(0x0100 << (irq - LOCOMO_IRQ_LT_START));
      locomo_writel(r, mapbase + LOCOMO_LTINT);
}

static void locomo_lt_mask_irq(unsigned int irq)
{
      void __iomem *mapbase = get_irq_chip_data(irq);
      unsigned int r;
      r = locomo_readl(mapbase + LOCOMO_LTINT);
      r &= ~(0x0010 << (irq - LOCOMO_IRQ_LT_START));
      locomo_writel(r, mapbase + LOCOMO_LTINT);
}

static void locomo_lt_unmask_irq(unsigned int irq)
{
      void __iomem *mapbase = get_irq_chip_data(irq);
      unsigned int r;
      r = locomo_readl(mapbase + LOCOMO_LTINT);
      r |= (0x0010 << (irq - LOCOMO_IRQ_LT_START));
      locomo_writel(r, mapbase + LOCOMO_LTINT);
}

static struct irq_chip locomo_lt_chip = {
      .name = "LOCOMO-lt",
      .ack  = locomo_lt_ack_irq,
      .mask = locomo_lt_mask_irq,
      .unmask     = locomo_lt_unmask_irq,
};

static void locomo_spi_handler(unsigned int irq, struct irq_desc *desc)
{
      int req, i;
      void __iomem *mapbase = get_irq_chip_data(irq);

      req = locomo_readl(mapbase + LOCOMO_SPI + LOCOMO_SPIIR) & 0x000F;
      if (req) {
            irq = LOCOMO_IRQ_SPI_START;

            for (i = 0; i <= 3; i++, irq++) {
                  if (req & (0x0001 << i)) {
                        generic_handle_irq(irq);
                  }
            }
      }
}

static void locomo_spi_ack_irq(unsigned int irq)
{
      void __iomem *mapbase = get_irq_chip_data(irq);
      unsigned int r;
      r = locomo_readl(mapbase + LOCOMO_SPI + LOCOMO_SPIWE);
      r |= (0x0001 << (irq - LOCOMO_IRQ_SPI_START));
      locomo_writel(r, mapbase + LOCOMO_SPI + LOCOMO_SPIWE);

      r = locomo_readl(mapbase + LOCOMO_SPI + LOCOMO_SPIIS);
      r &= ~(0x0001 << (irq - LOCOMO_IRQ_SPI_START));
      locomo_writel(r, mapbase + LOCOMO_SPI + LOCOMO_SPIIS);

      r = locomo_readl(mapbase + LOCOMO_SPI + LOCOMO_SPIWE);
      r &= ~(0x0001 << (irq - LOCOMO_IRQ_SPI_START));
      locomo_writel(r, mapbase + LOCOMO_SPI + LOCOMO_SPIWE);
}

static void locomo_spi_mask_irq(unsigned int irq)
{
      void __iomem *mapbase = get_irq_chip_data(irq);
      unsigned int r;
      r = locomo_readl(mapbase + LOCOMO_SPI + LOCOMO_SPIIE);
      r &= ~(0x0001 << (irq - LOCOMO_IRQ_SPI_START));
      locomo_writel(r, mapbase + LOCOMO_SPI + LOCOMO_SPIIE);
}

static void locomo_spi_unmask_irq(unsigned int irq)
{
      void __iomem *mapbase = get_irq_chip_data(irq);
      unsigned int r;
      r = locomo_readl(mapbase + LOCOMO_SPI + LOCOMO_SPIIE);
      r |= (0x0001 << (irq - LOCOMO_IRQ_SPI_START));
      locomo_writel(r, mapbase + LOCOMO_SPI + LOCOMO_SPIIE);
}

static struct irq_chip locomo_spi_chip = {
      .name = "LOCOMO-spi",
      .ack  = locomo_spi_ack_irq,
      .mask = locomo_spi_mask_irq,
      .unmask     = locomo_spi_unmask_irq,
};

static void locomo_setup_irq(struct locomo *lchip)
{
      int irq;
      void __iomem *irqbase = lchip->base;

      /*
       * Install handler for IRQ_LOCOMO_HW.
       */
      set_irq_type(lchip->irq, IRQ_TYPE_EDGE_FALLING);
      set_irq_chip_data(lchip->irq, irqbase);
      set_irq_chained_handler(lchip->irq, locomo_handler);

      /* Install handlers for IRQ_LOCOMO_*_BASE */
      set_irq_chip(IRQ_LOCOMO_KEY_BASE, &locomo_chip);
      set_irq_chip_data(IRQ_LOCOMO_KEY_BASE, irqbase);
      set_irq_chained_handler(IRQ_LOCOMO_KEY_BASE, locomo_key_handler);

      set_irq_chip(IRQ_LOCOMO_GPIO_BASE, &locomo_chip);
      set_irq_chip_data(IRQ_LOCOMO_GPIO_BASE, irqbase);
      set_irq_chained_handler(IRQ_LOCOMO_GPIO_BASE, locomo_gpio_handler);

      set_irq_chip(IRQ_LOCOMO_LT_BASE, &locomo_chip);
      set_irq_chip_data(IRQ_LOCOMO_LT_BASE, irqbase);
      set_irq_chained_handler(IRQ_LOCOMO_LT_BASE, locomo_lt_handler);

      set_irq_chip(IRQ_LOCOMO_SPI_BASE, &locomo_chip);
      set_irq_chip_data(IRQ_LOCOMO_SPI_BASE, irqbase);
      set_irq_chained_handler(IRQ_LOCOMO_SPI_BASE, locomo_spi_handler);

      /* install handlers for IRQ_LOCOMO_KEY_BASE generated interrupts */
      set_irq_chip(LOCOMO_IRQ_KEY_START, &locomo_key_chip);
      set_irq_chip_data(LOCOMO_IRQ_KEY_START, irqbase);
      set_irq_handler(LOCOMO_IRQ_KEY_START, handle_edge_irq);
      set_irq_flags(LOCOMO_IRQ_KEY_START, IRQF_VALID | IRQF_PROBE);

      /* install handlers for IRQ_LOCOMO_GPIO_BASE generated interrupts */
      for (irq = LOCOMO_IRQ_GPIO_START; irq < LOCOMO_IRQ_GPIO_START + 16; irq++) {
            set_irq_chip(irq, &locomo_gpio_chip);
            set_irq_chip_data(irq, irqbase);
            set_irq_handler(irq, handle_edge_irq);
            set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
      }

      /* install handlers for IRQ_LOCOMO_LT_BASE generated interrupts */
      set_irq_chip(LOCOMO_IRQ_LT_START, &locomo_lt_chip);
      set_irq_chip_data(LOCOMO_IRQ_LT_START, irqbase);
      set_irq_handler(LOCOMO_IRQ_LT_START, handle_edge_irq);
      set_irq_flags(LOCOMO_IRQ_LT_START, IRQF_VALID | IRQF_PROBE);

      /* install handlers for IRQ_LOCOMO_SPI_BASE generated interrupts */
      for (irq = LOCOMO_IRQ_SPI_START; irq < LOCOMO_IRQ_SPI_START + 4; irq++) {
            set_irq_chip(irq, &locomo_spi_chip);
            set_irq_chip_data(irq, irqbase);
            set_irq_handler(irq, handle_edge_irq);
            set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
      }
}


static void locomo_dev_release(struct device *_dev)
{
      struct locomo_dev *dev = LOCOMO_DEV(_dev);

      kfree(dev);
}

static int
locomo_init_one_child(struct locomo *lchip, struct locomo_dev_info *info)
{
      struct locomo_dev *dev;
      int ret;

      dev = kzalloc(sizeof(struct locomo_dev), GFP_KERNEL);
      if (!dev) {
            ret = -ENOMEM;
            goto out;
      }

      /*
       * If the parent device has a DMA mask associated with it,
       * propagate it down to the children.
       */
      if (lchip->dev->dma_mask) {
            dev->dma_mask = *lchip->dev->dma_mask;
            dev->dev.dma_mask = &dev->dma_mask;
      }

      dev_set_name(&dev->dev, "%s", info->name);
      dev->devid   = info->devid;
      dev->dev.parent  = lchip->dev;
      dev->dev.bus     = &locomo_bus_type;
      dev->dev.release = locomo_dev_release;
      dev->dev.coherent_dma_mask = lchip->dev->coherent_dma_mask;

      if (info->offset)
            dev->mapbase = lchip->base + info->offset;
      else
            dev->mapbase = 0;
      dev->length = info->length;

      memmove(dev->irq, info->irq, sizeof(dev->irq));

      ret = device_register(&dev->dev);
      if (ret) {
 out:
            kfree(dev);
      }
      return ret;
}

#ifdef CONFIG_PM

struct locomo_save_data {
      u16   LCM_GPO;
      u16   LCM_SPICT;
      u16   LCM_GPE;
      u16   LCM_ASD;
      u16   LCM_SPIMD;
};

static int locomo_suspend(struct platform_device *dev, pm_message_t state)
{
      struct locomo *lchip = platform_get_drvdata(dev);
      struct locomo_save_data *save;
      unsigned long flags;

      save = kmalloc(sizeof(struct locomo_save_data), GFP_KERNEL);
      if (!save)
            return -ENOMEM;

      lchip->saved_state = save;

      spin_lock_irqsave(&lchip->lock, flags);

      save->LCM_GPO     = locomo_readl(lchip->base + LOCOMO_GPO); /* GPIO */
      locomo_writel(0x00, lchip->base + LOCOMO_GPO);
      save->LCM_SPICT   = locomo_readl(lchip->base + LOCOMO_SPI + LOCOMO_SPICT);    /* SPI */
      locomo_writel(0x40, lchip->base + LOCOMO_SPICT);
      save->LCM_GPE     = locomo_readl(lchip->base + LOCOMO_GPE); /* GPIO */
      locomo_writel(0x00, lchip->base + LOCOMO_GPE);
      save->LCM_ASD     = locomo_readl(lchip->base + LOCOMO_ASD); /* ADSTART */
      locomo_writel(0x00, lchip->base + LOCOMO_ASD);
      save->LCM_SPIMD   = locomo_readl(lchip->base + LOCOMO_SPI + LOCOMO_SPIMD);    /* SPI */
      locomo_writel(0x3C14, lchip->base + LOCOMO_SPI + LOCOMO_SPIMD);

      locomo_writel(0x00, lchip->base + LOCOMO_PAIF);
      locomo_writel(0x00, lchip->base + LOCOMO_DAC);
      locomo_writel(0x00, lchip->base + LOCOMO_BACKLIGHT + LOCOMO_TC);

      if ((locomo_readl(lchip->base + LOCOMO_LED + LOCOMO_LPT0) & 0x88) && (locomo_readl(lchip->base + LOCOMO_LED + LOCOMO_LPT1) & 0x88))
            locomo_writel(0x00, lchip->base + LOCOMO_C32K);       /* CLK32 off */
      else
            /* 18MHz already enabled, so no wait */
            locomo_writel(0xc1, lchip->base + LOCOMO_C32K);       /* CLK32 on */

      locomo_writel(0x00, lchip->base + LOCOMO_TADC);       /* 18MHz clock off*/
      locomo_writel(0x00, lchip->base + LOCOMO_AUDIO + LOCOMO_ACC);                 /* 22MHz/24MHz clock off */
      locomo_writel(0x00, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);                  /* FL */

      spin_unlock_irqrestore(&lchip->lock, flags);

      return 0;
}

static int locomo_resume(struct platform_device *dev)
{
      struct locomo *lchip = platform_get_drvdata(dev);
      struct locomo_save_data *save;
      unsigned long r;
      unsigned long flags;

      save = lchip->saved_state;
      if (!save)
            return 0;

      spin_lock_irqsave(&lchip->lock, flags);

      locomo_writel(save->LCM_GPO, lchip->base + LOCOMO_GPO);
      locomo_writel(save->LCM_SPICT, lchip->base + LOCOMO_SPI + LOCOMO_SPICT);
      locomo_writel(save->LCM_GPE, lchip->base + LOCOMO_GPE);
      locomo_writel(save->LCM_ASD, lchip->base + LOCOMO_ASD);
      locomo_writel(save->LCM_SPIMD, lchip->base + LOCOMO_SPI + LOCOMO_SPIMD);

      locomo_writel(0x00, lchip->base + LOCOMO_C32K);
      locomo_writel(0x90, lchip->base + LOCOMO_TADC);

      locomo_writel(0, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KSC);
      r = locomo_readl(lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
      r &= 0xFEFF;
      locomo_writel(r, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);
      locomo_writel(0x1, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KCMD);

      spin_unlock_irqrestore(&lchip->lock, flags);

      lchip->saved_state = NULL;
      kfree(save);

      return 0;
}
#endif


/**
 *    locomo_probe - probe for a single LoCoMo chip.
 *    @phys_addr: physical address of device.
 *
 *    Probe for a LoCoMo chip.  This must be called
 *    before any other locomo-specific code.
 *
 *    Returns:
 *    %-ENODEV    device not found.
 *    %-EBUSY           physical address already marked in-use.
 *    %0          successful.
 */
static int
__locomo_probe(struct device *me, struct resource *mem, int irq)
{
      struct locomo *lchip;
      unsigned long r;
      int i, ret = -ENODEV;

      lchip = kzalloc(sizeof(struct locomo), GFP_KERNEL);
      if (!lchip)
            return -ENOMEM;

      spin_lock_init(&lchip->lock);

      lchip->dev = me;
      dev_set_drvdata(lchip->dev, lchip);

      lchip->phys = mem->start;
      lchip->irq = irq;

      /*
       * Map the whole region.  This also maps the
       * registers for our children.
       */
      lchip->base = ioremap(mem->start, PAGE_SIZE);
      if (!lchip->base) {
            ret = -ENOMEM;
            goto out;
      }

      /* locomo initialize */
      locomo_writel(0, lchip->base + LOCOMO_ICR);
      /* KEYBOARD */
      locomo_writel(0, lchip->base + LOCOMO_KEYBOARD + LOCOMO_KIC);

      /* GPIO */
      locomo_writel(0, lchip->base + LOCOMO_GPO);
      locomo_writel((LOCOMO_GPIO(1) | LOCOMO_GPIO(2) | LOCOMO_GPIO(13) | LOCOMO_GPIO(14))
                  , lchip->base + LOCOMO_GPE);
      locomo_writel((LOCOMO_GPIO(1) | LOCOMO_GPIO(2) | LOCOMO_GPIO(13) | LOCOMO_GPIO(14))
                  , lchip->base + LOCOMO_GPD);
      locomo_writel(0, lchip->base + LOCOMO_GIE);

      /* Frontlight */
      locomo_writel(0, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
      locomo_writel(0, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALD);

      /* Longtime timer */
      locomo_writel(0, lchip->base + LOCOMO_LTINT);
      /* SPI */
      locomo_writel(0, lchip->base + LOCOMO_SPIIE);

      locomo_writel(6 + 8 + 320 + 30 - 10, lchip->base + LOCOMO_ASD);
      r = locomo_readl(lchip->base + LOCOMO_ASD);
      r |= 0x8000;
      locomo_writel(r, lchip->base + LOCOMO_ASD);

      locomo_writel(6 + 8 + 320 + 30 - 10 - 128 + 4, lchip->base + LOCOMO_HSD);
      r = locomo_readl(lchip->base + LOCOMO_HSD);
      r |= 0x8000;
      locomo_writel(r, lchip->base + LOCOMO_HSD);

      locomo_writel(128 / 8, lchip->base + LOCOMO_HSC);

      /* XON */
      locomo_writel(0x80, lchip->base + LOCOMO_TADC);
      udelay(1000);
      /* CLK9MEN */
      r = locomo_readl(lchip->base + LOCOMO_TADC);
      r |= 0x10;
      locomo_writel(r, lchip->base + LOCOMO_TADC);
      udelay(100);

      /* init DAC */
      r = locomo_readl(lchip->base + LOCOMO_DAC);
      r |= LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
      locomo_writel(r, lchip->base + LOCOMO_DAC);

      r = locomo_readl(lchip->base + LOCOMO_VER);
      printk(KERN_INFO "LoCoMo Chip: %lu%lu\n", (r >> 8), (r & 0xff));

      /*
       * The interrupt controller must be initialised before any
       * other device to ensure that the interrupts are available.
       */
      if (lchip->irq != NO_IRQ)
            locomo_setup_irq(lchip);

      for (i = 0; i < ARRAY_SIZE(locomo_devices); i++)
            locomo_init_one_child(lchip, &locomo_devices[i]);
      return 0;

 out:
      kfree(lchip);
      return ret;
}

static int locomo_remove_child(struct device *dev, void *data)
{
      device_unregister(dev);
      return 0;
} 

static void __locomo_remove(struct locomo *lchip)
{
      device_for_each_child(lchip->dev, NULL, locomo_remove_child);

      if (lchip->irq != NO_IRQ) {
            set_irq_chained_handler(lchip->irq, NULL);
            set_irq_data(lchip->irq, NULL);
      }

      iounmap(lchip->base);
      kfree(lchip);
}

static int locomo_probe(struct platform_device *dev)
{
      struct resource *mem;
      int irq;

      mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
      if (!mem)
            return -EINVAL;
      irq = platform_get_irq(dev, 0);
      if (irq < 0)
            return -ENXIO;

      return __locomo_probe(&dev->dev, mem, irq);
}

static int locomo_remove(struct platform_device *dev)
{
      struct locomo *lchip = platform_get_drvdata(dev);

      if (lchip) {
            __locomo_remove(lchip);
            platform_set_drvdata(dev, NULL);
      }

      return 0;
}

/*
 *    Not sure if this should be on the system bus or not yet.
 *    We really want some way to register a system device at
 *    the per-machine level, and then have this driver pick
 *    up the registered devices.
 */
static struct platform_driver locomo_device_driver = {
      .probe            = locomo_probe,
      .remove           = locomo_remove,
#ifdef CONFIG_PM
      .suspend    = locomo_suspend,
      .resume           = locomo_resume,
#endif
      .driver           = {
            .name = "locomo",
      },
};

/*
 *    Get the parent device driver (us) structure
 *    from a child function device
 */
static inline struct locomo *locomo_chip_driver(struct locomo_dev *ldev)
{
      return (struct locomo *)dev_get_drvdata(ldev->dev.parent);
}

void locomo_gpio_set_dir(struct device *dev, unsigned int bits, unsigned int dir)
{
      struct locomo *lchip = dev_get_drvdata(dev);
      unsigned long flags;
      unsigned int r;

      if (!lchip)
            return;

      spin_lock_irqsave(&lchip->lock, flags);

      r = locomo_readl(lchip->base + LOCOMO_GPD);
      if (dir)
            r |= bits;
      else
            r &= ~bits;
      locomo_writel(r, lchip->base + LOCOMO_GPD);

      r = locomo_readl(lchip->base + LOCOMO_GPE);
      if (dir)
            r |= bits;
      else
            r &= ~bits;
      locomo_writel(r, lchip->base + LOCOMO_GPE);

      spin_unlock_irqrestore(&lchip->lock, flags);
}

int locomo_gpio_read_level(struct device *dev, unsigned int bits)
{
      struct locomo *lchip = dev_get_drvdata(dev);
      unsigned long flags;
      unsigned int ret;

      if (!lchip)
            return -ENODEV;

      spin_lock_irqsave(&lchip->lock, flags);
      ret = locomo_readl(lchip->base + LOCOMO_GPL);
      spin_unlock_irqrestore(&lchip->lock, flags);

      ret &= bits;
      return ret;
}

int locomo_gpio_read_output(struct device *dev, unsigned int bits)
{
      struct locomo *lchip = dev_get_drvdata(dev);
      unsigned long flags;
      unsigned int ret;

      if (!lchip)
            return -ENODEV;

      spin_lock_irqsave(&lchip->lock, flags);
      ret = locomo_readl(lchip->base + LOCOMO_GPO);
      spin_unlock_irqrestore(&lchip->lock, flags);

      ret &= bits;
      return ret;
}

void locomo_gpio_write(struct device *dev, unsigned int bits, unsigned int set)
{
      struct locomo *lchip = dev_get_drvdata(dev);
      unsigned long flags;
      unsigned int r;

      if (!lchip)
            return;

      spin_lock_irqsave(&lchip->lock, flags);

      r = locomo_readl(lchip->base + LOCOMO_GPO);
      if (set)
            r |= bits;
      else
            r &= ~bits;
      locomo_writel(r, lchip->base + LOCOMO_GPO);

      spin_unlock_irqrestore(&lchip->lock, flags);
}

static void locomo_m62332_sendbit(void *mapbase, int bit)
{
      unsigned int r;

      r = locomo_readl(mapbase + LOCOMO_DAC);
      r &=  ~(LOCOMO_DAC_SCLOEB);
      locomo_writel(r, mapbase + LOCOMO_DAC);
      udelay(DAC_LOW_SETUP_TIME);   /* 300 nsec */
      udelay(DAC_DATA_HOLD_TIME);   /* 300 nsec */
      r = locomo_readl(mapbase + LOCOMO_DAC);
      r &=  ~(LOCOMO_DAC_SCLOEB);
      locomo_writel(r, mapbase + LOCOMO_DAC);
      udelay(DAC_LOW_SETUP_TIME);   /* 300 nsec */
      udelay(DAC_SCL_LOW_HOLD_TIME);      /* 4.7 usec */

      if (bit & 1) {
            r = locomo_readl(mapbase + LOCOMO_DAC);
            r |=  LOCOMO_DAC_SDAOEB;
            locomo_writel(r, mapbase + LOCOMO_DAC);
            udelay(DAC_HIGH_SETUP_TIME);  /* 1000 nsec */
      } else {
            r = locomo_readl(mapbase + LOCOMO_DAC);
            r &=  ~(LOCOMO_DAC_SDAOEB);
            locomo_writel(r, mapbase + LOCOMO_DAC);
            udelay(DAC_LOW_SETUP_TIME);   /* 300 nsec */
      }

      udelay(DAC_DATA_SETUP_TIME);  /* 250 nsec */
      r = locomo_readl(mapbase + LOCOMO_DAC);
      r |=  LOCOMO_DAC_SCLOEB;
      locomo_writel(r, mapbase + LOCOMO_DAC);
      udelay(DAC_HIGH_SETUP_TIME);  /* 1000 nsec */
      udelay(DAC_SCL_HIGH_HOLD_TIME);     /*  4.0 usec */
}

void locomo_m62332_senddata(struct locomo_dev *ldev, unsigned int dac_data, int channel)
{
      struct locomo *lchip = locomo_chip_driver(ldev);
      int i;
      unsigned char data;
      unsigned int r;
      void *mapbase = lchip->base;
      unsigned long flags;

      spin_lock_irqsave(&lchip->lock, flags);

      /* Start */
      udelay(DAC_BUS_FREE_TIME);    /* 5.0 usec */
      r = locomo_readl(mapbase + LOCOMO_DAC);
      r |=  LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
      locomo_writel(r, mapbase + LOCOMO_DAC);
      udelay(DAC_HIGH_SETUP_TIME);  /* 1000 nsec */
      udelay(DAC_SCL_HIGH_HOLD_TIME);     /* 4.0 usec */
      r = locomo_readl(mapbase + LOCOMO_DAC);
      r &=  ~(LOCOMO_DAC_SDAOEB);
      locomo_writel(r, mapbase + LOCOMO_DAC);
      udelay(DAC_START_HOLD_TIME);  /* 5.0 usec */
      udelay(DAC_DATA_HOLD_TIME);   /* 300 nsec */

      /* Send slave address and W bit (LSB is W bit) */
      data = (M62332_SLAVE_ADDR << 1) | M62332_W_BIT;
      for (i = 1; i <= 8; i++) {
            locomo_m62332_sendbit(mapbase, data >> (8 - i));
      }

      /* Check A bit */
      r = locomo_readl(mapbase + LOCOMO_DAC);
      r &=  ~(LOCOMO_DAC_SCLOEB);
      locomo_writel(r, mapbase + LOCOMO_DAC);
      udelay(DAC_LOW_SETUP_TIME);   /* 300 nsec */
      udelay(DAC_SCL_LOW_HOLD_TIME);      /* 4.7 usec */
      r = locomo_readl(mapbase + LOCOMO_DAC);
      r &=  ~(LOCOMO_DAC_SDAOEB);
      locomo_writel(r, mapbase + LOCOMO_DAC);
      udelay(DAC_LOW_SETUP_TIME);   /* 300 nsec */
      r = locomo_readl(mapbase + LOCOMO_DAC);
      r |=  LOCOMO_DAC_SCLOEB;
      locomo_writel(r, mapbase + LOCOMO_DAC);
      udelay(DAC_HIGH_SETUP_TIME);  /* 1000 nsec */
      udelay(DAC_SCL_HIGH_HOLD_TIME);     /* 4.7 usec */
      if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) {     /* High is error */
            printk(KERN_WARNING "locomo: m62332_senddata Error 1\n");
            return;
      }

      /* Send Sub address (LSB is channel select) */
      /*    channel = 0 : ch1 select              */
      /*            = 1 : ch2 select              */
      data = M62332_SUB_ADDR + channel;
      for (i = 1; i <= 8; i++) {
            locomo_m62332_sendbit(mapbase, data >> (8 - i));
      }

      /* Check A bit */
      r = locomo_readl(mapbase + LOCOMO_DAC);
      r &=  ~(LOCOMO_DAC_SCLOEB);
      locomo_writel(r, mapbase + LOCOMO_DAC);
      udelay(DAC_LOW_SETUP_TIME);   /* 300 nsec */
      udelay(DAC_SCL_LOW_HOLD_TIME);      /* 4.7 usec */
      r = locomo_readl(mapbase + LOCOMO_DAC);
      r &=  ~(LOCOMO_DAC_SDAOEB);
      locomo_writel(r, mapbase + LOCOMO_DAC);
      udelay(DAC_LOW_SETUP_TIME);   /* 300 nsec */
      r = locomo_readl(mapbase + LOCOMO_DAC);
      r |=  LOCOMO_DAC_SCLOEB;
      locomo_writel(r, mapbase + LOCOMO_DAC);
      udelay(DAC_HIGH_SETUP_TIME);  /* 1000 nsec */
      udelay(DAC_SCL_HIGH_HOLD_TIME);     /* 4.7 usec */
      if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) {     /* High is error */
            printk(KERN_WARNING "locomo: m62332_senddata Error 2\n");
            return;
      }

      /* Send DAC data */
      for (i = 1; i <= 8; i++) {
            locomo_m62332_sendbit(mapbase, dac_data >> (8 - i));
      }

      /* Check A bit */
      r = locomo_readl(mapbase + LOCOMO_DAC);
      r &=  ~(LOCOMO_DAC_SCLOEB);
      locomo_writel(r, mapbase + LOCOMO_DAC);
      udelay(DAC_LOW_SETUP_TIME);   /* 300 nsec */
      udelay(DAC_SCL_LOW_HOLD_TIME);      /* 4.7 usec */
      r = locomo_readl(mapbase + LOCOMO_DAC);
      r &=  ~(LOCOMO_DAC_SDAOEB);
      locomo_writel(r, mapbase + LOCOMO_DAC);
      udelay(DAC_LOW_SETUP_TIME);   /* 300 nsec */
      r = locomo_readl(mapbase + LOCOMO_DAC);
      r |=  LOCOMO_DAC_SCLOEB;
      locomo_writel(r, mapbase + LOCOMO_DAC);
      udelay(DAC_HIGH_SETUP_TIME);  /* 1000 nsec */
      udelay(DAC_SCL_HIGH_HOLD_TIME);     /* 4.7 usec */
      if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) {     /* High is error */
            printk(KERN_WARNING "locomo: m62332_senddata Error 3\n");
            return;
      }

      /* stop */
      r = locomo_readl(mapbase + LOCOMO_DAC);
      r &=  ~(LOCOMO_DAC_SCLOEB);
      locomo_writel(r, mapbase + LOCOMO_DAC);
      udelay(DAC_LOW_SETUP_TIME);   /* 300 nsec */
      udelay(DAC_SCL_LOW_HOLD_TIME);      /* 4.7 usec */
      r = locomo_readl(mapbase + LOCOMO_DAC);
      r |=  LOCOMO_DAC_SCLOEB;
      locomo_writel(r, mapbase + LOCOMO_DAC);
      udelay(DAC_HIGH_SETUP_TIME);  /* 1000 nsec */
      udelay(DAC_SCL_HIGH_HOLD_TIME);     /* 4 usec */
      r = locomo_readl(mapbase + LOCOMO_DAC);
      r |=  LOCOMO_DAC_SDAOEB;
      locomo_writel(r, mapbase + LOCOMO_DAC);
      udelay(DAC_HIGH_SETUP_TIME);  /* 1000 nsec */
      udelay(DAC_SCL_HIGH_HOLD_TIME);     /* 4 usec */

      r = locomo_readl(mapbase + LOCOMO_DAC);
      r |=  LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
      locomo_writel(r, mapbase + LOCOMO_DAC);
      udelay(DAC_LOW_SETUP_TIME);   /* 1000 nsec */
      udelay(DAC_SCL_LOW_HOLD_TIME);      /* 4.7 usec */

      spin_unlock_irqrestore(&lchip->lock, flags);
}

/*
 *    Frontlight control
 */

static struct locomo *locomo_chip_driver(struct locomo_dev *ldev);

void locomo_frontlight_set(struct locomo_dev *dev, int duty, int vr, int bpwf)
{
      unsigned long flags;
      struct locomo *lchip = locomo_chip_driver(dev);

      if (vr)
            locomo_gpio_write(dev->dev.parent, LOCOMO_GPIO_FL_VR, 1);
      else
            locomo_gpio_write(dev->dev.parent, LOCOMO_GPIO_FL_VR, 0);

      spin_lock_irqsave(&lchip->lock, flags);
      locomo_writel(bpwf, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
      udelay(100);
      locomo_writel(duty, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALD);
      locomo_writel(bpwf | LOCOMO_ALC_EN, lchip->base + LOCOMO_FRONTLIGHT + LOCOMO_ALS);
      spin_unlock_irqrestore(&lchip->lock, flags);
}
EXPORT_SYMBOL(locomo_frontlight_set);

/*
 *    LoCoMo "Register Access Bus."
 *
 *    We model this as a regular bus type, and hang devices directly
 *    off this.
 */
static int locomo_match(struct device *_dev, struct device_driver *_drv)
{
      struct locomo_dev *dev = LOCOMO_DEV(_dev);
      struct locomo_driver *drv = LOCOMO_DRV(_drv);

      return dev->devid == drv->devid;
}

static int locomo_bus_suspend(struct device *dev, pm_message_t state)
{
      struct locomo_dev *ldev = LOCOMO_DEV(dev);
      struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
      int ret = 0;

      if (drv && drv->suspend)
            ret = drv->suspend(ldev, state);
      return ret;
}

static int locomo_bus_resume(struct device *dev)
{
      struct locomo_dev *ldev = LOCOMO_DEV(dev);
      struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
      int ret = 0;

      if (drv && drv->resume)
            ret = drv->resume(ldev);
      return ret;
}

static int locomo_bus_probe(struct device *dev)
{
      struct locomo_dev *ldev = LOCOMO_DEV(dev);
      struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
      int ret = -ENODEV;

      if (drv->probe)
            ret = drv->probe(ldev);
      return ret;
}

static int locomo_bus_remove(struct device *dev)
{
      struct locomo_dev *ldev = LOCOMO_DEV(dev);
      struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
      int ret = 0;

      if (drv->remove)
            ret = drv->remove(ldev);
      return ret;
}

struct bus_type locomo_bus_type = {
      .name       = "locomo-bus",
      .match            = locomo_match,
      .probe            = locomo_bus_probe,
      .remove           = locomo_bus_remove,
      .suspend    = locomo_bus_suspend,
      .resume           = locomo_bus_resume,
};

int locomo_driver_register(struct locomo_driver *driver)
{
      driver->drv.bus = &locomo_bus_type;
      return driver_register(&driver->drv);
}

void locomo_driver_unregister(struct locomo_driver *driver)
{
      driver_unregister(&driver->drv);
}

static int __init locomo_init(void)
{
      int ret = bus_register(&locomo_bus_type);
      if (ret == 0)
            platform_driver_register(&locomo_device_driver);
      return ret;
}

static void __exit locomo_exit(void)
{
      platform_driver_unregister(&locomo_device_driver);
      bus_unregister(&locomo_bus_type);
}

module_init(locomo_init);
module_exit(locomo_exit);

MODULE_DESCRIPTION("Sharp LoCoMo core driver");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>");

EXPORT_SYMBOL(locomo_driver_register);
EXPORT_SYMBOL(locomo_driver_unregister);
EXPORT_SYMBOL(locomo_gpio_set_dir);
EXPORT_SYMBOL(locomo_gpio_read_level);
EXPORT_SYMBOL(locomo_gpio_read_output);
EXPORT_SYMBOL(locomo_gpio_write);
EXPORT_SYMBOL(locomo_m62332_senddata);

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