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core.c

/*
 * arch/arm/mach-ep93xx/core.c
 * Core routines for Cirrus EP93xx chips.
 *
 * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
 * Copyright (C) 2007 Herbert Valerio Riedel <hvr@gnu.org>
 *
 * Thanks go to Michael Burian and Ray Lehtiniemi for their key
 * role in the ep93xx linux community.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 */

#define pr_fmt(fmt) "ep93xx " KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/dma-mapping.h>
#include <linux/timex.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <linux/leds.h>
#include <linux/termios.h>
#include <linux/amba/bus.h>
#include <linux/amba/serial.h>
#include <linux/mtd/physmap.h>
#include <linux/i2c.h>
#include <linux/i2c-gpio.h>
#include <linux/spi/spi.h>

#include <mach/hardware.h>
#include <mach/fb.h>
#include <mach/ep93xx_keypad.h>
#include <mach/ep93xx_spi.h>

#include <asm/mach/map.h>
#include <asm/mach/time.h>

#include <asm/hardware/vic.h>


/*************************************************************************
 * Static I/O mappings that are needed for all EP93xx platforms
 *************************************************************************/
static struct map_desc ep93xx_io_desc[] __initdata = {
      {
            .virtual    = EP93XX_AHB_VIRT_BASE,
            .pfn        = __phys_to_pfn(EP93XX_AHB_PHYS_BASE),
            .length           = EP93XX_AHB_SIZE,
            .type       = MT_DEVICE,
      }, {
            .virtual    = EP93XX_APB_VIRT_BASE,
            .pfn        = __phys_to_pfn(EP93XX_APB_PHYS_BASE),
            .length           = EP93XX_APB_SIZE,
            .type       = MT_DEVICE,
      },
};

void __init ep93xx_map_io(void)
{
      iotable_init(ep93xx_io_desc, ARRAY_SIZE(ep93xx_io_desc));
}


/*************************************************************************
 * Timer handling for EP93xx
 *************************************************************************
 * The ep93xx has four internal timers.  Timers 1, 2 (both 16 bit) and
 * 3 (32 bit) count down at 508 kHz, are self-reloading, and can generate
 * an interrupt on underflow.  Timer 4 (40 bit) counts down at 983.04 kHz,
 * is free-running, and can't generate interrupts.
 *
 * The 508 kHz timers are ideal for use for the timer interrupt, as the
 * most common values of HZ divide 508 kHz nicely.  We pick one of the 16
 * bit timers (timer 1) since we don't need more than 16 bits of reload
 * value as long as HZ >= 8.
 *
 * The higher clock rate of timer 4 makes it a better choice than the
 * other timers for use in gettimeoffset(), while the fact that it can't
 * generate interrupts means we don't have to worry about not being able
 * to use this timer for something else.  We also use timer 4 for keeping
 * track of lost jiffies.
 */
#define EP93XX_TIMER_REG(x)         (EP93XX_TIMER_BASE + (x))
#define EP93XX_TIMER1_LOAD          EP93XX_TIMER_REG(0x00)
#define EP93XX_TIMER1_VALUE         EP93XX_TIMER_REG(0x04)
#define EP93XX_TIMER1_CONTROL       EP93XX_TIMER_REG(0x08)
#define EP93XX_TIMER123_CONTROL_ENABLE    (1 << 7)
#define EP93XX_TIMER123_CONTROL_MODE      (1 << 6)
#define EP93XX_TIMER123_CONTROL_CLKSEL    (1 << 3)
#define EP93XX_TIMER1_CLEAR         EP93XX_TIMER_REG(0x0c)
#define EP93XX_TIMER2_LOAD          EP93XX_TIMER_REG(0x20)
#define EP93XX_TIMER2_VALUE         EP93XX_TIMER_REG(0x24)
#define EP93XX_TIMER2_CONTROL       EP93XX_TIMER_REG(0x28)
#define EP93XX_TIMER2_CLEAR         EP93XX_TIMER_REG(0x2c)
#define EP93XX_TIMER4_VALUE_LOW           EP93XX_TIMER_REG(0x60)
#define EP93XX_TIMER4_VALUE_HIGH    EP93XX_TIMER_REG(0x64)
#define EP93XX_TIMER4_VALUE_HIGH_ENABLE   (1 << 8)
#define EP93XX_TIMER3_LOAD          EP93XX_TIMER_REG(0x80)
#define EP93XX_TIMER3_VALUE         EP93XX_TIMER_REG(0x84)
#define EP93XX_TIMER3_CONTROL       EP93XX_TIMER_REG(0x88)
#define EP93XX_TIMER3_CLEAR         EP93XX_TIMER_REG(0x8c)

#define EP93XX_TIMER123_CLOCK       508469
#define EP93XX_TIMER4_CLOCK         983040

#define TIMER1_RELOAD               ((EP93XX_TIMER123_CLOCK / HZ) - 1)
#define TIMER4_TICKS_PER_JIFFY            DIV_ROUND_CLOSEST(CLOCK_TICK_RATE, HZ)

static unsigned int last_jiffy_time;

static irqreturn_t ep93xx_timer_interrupt(int irq, void *dev_id)
{
      /* Writing any value clears the timer interrupt */
      __raw_writel(1, EP93XX_TIMER1_CLEAR);

      /* Recover lost jiffies */
      while ((signed long)
            (__raw_readl(EP93XX_TIMER4_VALUE_LOW) - last_jiffy_time)
                                    >= TIMER4_TICKS_PER_JIFFY) {
            last_jiffy_time += TIMER4_TICKS_PER_JIFFY;
            timer_tick();
      }

      return IRQ_HANDLED;
}

static struct irqaction ep93xx_timer_irq = {
      .name       = "ep93xx timer",
      .flags            = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
      .handler    = ep93xx_timer_interrupt,
};

static void __init ep93xx_timer_init(void)
{
      u32 tmode = EP93XX_TIMER123_CONTROL_MODE |
                EP93XX_TIMER123_CONTROL_CLKSEL;

      /* Enable periodic HZ timer.  */
      __raw_writel(tmode, EP93XX_TIMER1_CONTROL);
      __raw_writel(TIMER1_RELOAD, EP93XX_TIMER1_LOAD);
      __raw_writel(tmode | EP93XX_TIMER123_CONTROL_ENABLE,
                  EP93XX_TIMER1_CONTROL);

      /* Enable lost jiffy timer.  */
      __raw_writel(EP93XX_TIMER4_VALUE_HIGH_ENABLE,
                  EP93XX_TIMER4_VALUE_HIGH);

      setup_irq(IRQ_EP93XX_TIMER1, &ep93xx_timer_irq);
}

static unsigned long ep93xx_gettimeoffset(void)
{
      int offset;

      offset = __raw_readl(EP93XX_TIMER4_VALUE_LOW) - last_jiffy_time;

      /* Calculate (1000000 / 983040) * offset.  */
      return offset + (53 * offset / 3072);
}

struct sys_timer ep93xx_timer = {
      .init       = ep93xx_timer_init,
      .offset           = ep93xx_gettimeoffset,
};


/*************************************************************************
 * EP93xx IRQ handling
 *************************************************************************/
extern void ep93xx_gpio_init_irq(void);

void __init ep93xx_init_irq(void)
{
      vic_init(EP93XX_VIC1_BASE, 0, EP93XX_VIC1_VALID_IRQ_MASK, 0);
      vic_init(EP93XX_VIC2_BASE, 32, EP93XX_VIC2_VALID_IRQ_MASK, 0);

      ep93xx_gpio_init_irq();
}


/*************************************************************************
 * EP93xx System Controller Software Locked register handling
 *************************************************************************/

/*
 * syscon_swlock prevents anything else from writing to the syscon
 * block while a software locked register is being written.
 */
static DEFINE_SPINLOCK(syscon_swlock);

void ep93xx_syscon_swlocked_write(unsigned int val, void __iomem *reg)
{
      unsigned long flags;

      spin_lock_irqsave(&syscon_swlock, flags);

      __raw_writel(0xaa, EP93XX_SYSCON_SWLOCK);
      __raw_writel(val, reg);

      spin_unlock_irqrestore(&syscon_swlock, flags);
}
EXPORT_SYMBOL(ep93xx_syscon_swlocked_write);

void ep93xx_devcfg_set_clear(unsigned int set_bits, unsigned int clear_bits)
{
      unsigned long flags;
      unsigned int val;

      spin_lock_irqsave(&syscon_swlock, flags);

      val = __raw_readl(EP93XX_SYSCON_DEVCFG);
      val &= ~clear_bits;
      val |= set_bits;
      __raw_writel(0xaa, EP93XX_SYSCON_SWLOCK);
      __raw_writel(val, EP93XX_SYSCON_DEVCFG);

      spin_unlock_irqrestore(&syscon_swlock, flags);
}
EXPORT_SYMBOL(ep93xx_devcfg_set_clear);

/**
 * ep93xx_chip_revision() - returns the EP93xx chip revision
 *
 * See <mach/platform.h> for more information.
 */
unsigned int ep93xx_chip_revision(void)
{
      unsigned int v;

      v = __raw_readl(EP93XX_SYSCON_SYSCFG);
      v &= EP93XX_SYSCON_SYSCFG_REV_MASK;
      v >>= EP93XX_SYSCON_SYSCFG_REV_SHIFT;
      return v;
}

/*************************************************************************
 * EP93xx peripheral handling
 *************************************************************************/
#define EP93XX_UART_MCR_OFFSET            (0x0100)

static void ep93xx_uart_set_mctrl(struct amba_device *dev,
                          void __iomem *base, unsigned int mctrl)
{
      unsigned int mcr;

      mcr = 0;
      if (!(mctrl & TIOCM_RTS))
            mcr |= 2;
      if (!(mctrl & TIOCM_DTR))
            mcr |= 1;

      __raw_writel(mcr, base + EP93XX_UART_MCR_OFFSET);
}

static struct amba_pl010_data ep93xx_uart_data = {
      .set_mctrl  = ep93xx_uart_set_mctrl,
};

static struct amba_device uart1_device = {
      .dev        = {
            .init_name  = "apb:uart1",
            .platform_data    = &ep93xx_uart_data,
      },
      .res        = {
            .start      = EP93XX_UART1_PHYS_BASE,
            .end  = EP93XX_UART1_PHYS_BASE + 0x0fff,
            .flags      = IORESOURCE_MEM,
      },
      .irq        = { IRQ_EP93XX_UART1, NO_IRQ },
      .periphid   = 0x00041010,
};

static struct amba_device uart2_device = {
      .dev        = {
            .init_name  = "apb:uart2",
            .platform_data    = &ep93xx_uart_data,
      },
      .res        = {
            .start      = EP93XX_UART2_PHYS_BASE,
            .end  = EP93XX_UART2_PHYS_BASE + 0x0fff,
            .flags      = IORESOURCE_MEM,
      },
      .irq        = { IRQ_EP93XX_UART2, NO_IRQ },
      .periphid   = 0x00041010,
};

static struct amba_device uart3_device = {
      .dev        = {
            .init_name  = "apb:uart3",
            .platform_data    = &ep93xx_uart_data,
      },
      .res        = {
            .start      = EP93XX_UART3_PHYS_BASE,
            .end  = EP93XX_UART3_PHYS_BASE + 0x0fff,
            .flags      = IORESOURCE_MEM,
      },
      .irq        = { IRQ_EP93XX_UART3, NO_IRQ },
      .periphid   = 0x00041010,
};


static struct resource ep93xx_rtc_resource[] = {
      {
            .start            = EP93XX_RTC_PHYS_BASE,
            .end        = EP93XX_RTC_PHYS_BASE + 0x10c - 1,
            .flags            = IORESOURCE_MEM,
      },
};

static struct platform_device ep93xx_rtc_device = {
      .name       = "ep93xx-rtc",
      .id         = -1,
      .num_resources    = ARRAY_SIZE(ep93xx_rtc_resource),
      .resource   = ep93xx_rtc_resource,
};


static struct resource ep93xx_ohci_resources[] = {
      [0] = {
            .start      = EP93XX_USB_PHYS_BASE,
            .end  = EP93XX_USB_PHYS_BASE + 0x0fff,
            .flags      = IORESOURCE_MEM,
      },
      [1] = {
            .start      = IRQ_EP93XX_USB,
            .end  = IRQ_EP93XX_USB,
            .flags      = IORESOURCE_IRQ,
      },
};


static struct platform_device ep93xx_ohci_device = {
      .name       = "ep93xx-ohci",
      .id         = -1,
      .dev        = {
            .dma_mask         = &ep93xx_ohci_device.dev.coherent_dma_mask,
            .coherent_dma_mask      = DMA_BIT_MASK(32),
      },
      .num_resources    = ARRAY_SIZE(ep93xx_ohci_resources),
      .resource   = ep93xx_ohci_resources,
};


/*************************************************************************
 * EP93xx physmap'ed flash
 *************************************************************************/
static struct physmap_flash_data ep93xx_flash_data;

static struct resource ep93xx_flash_resource = {
      .flags            = IORESOURCE_MEM,
};

static struct platform_device ep93xx_flash = {
      .name       = "physmap-flash",
      .id         = 0,
      .dev        = {
            .platform_data    = &ep93xx_flash_data,
      },
      .num_resources    = 1,
      .resource   = &ep93xx_flash_resource,
};

/**
 * ep93xx_register_flash() - Register the external flash device.
 * @width:  bank width in octets
 * @start:  resource start address
 * @size:   resource size
 */
void __init ep93xx_register_flash(unsigned int width,
                          resource_size_t start, resource_size_t size)
{
      ep93xx_flash_data.width       = width;

      ep93xx_flash_resource.start   = start;
      ep93xx_flash_resource.end     = start + size - 1;

      platform_device_register(&ep93xx_flash);
}


/*************************************************************************
 * EP93xx ethernet peripheral handling
 *************************************************************************/
static struct ep93xx_eth_data ep93xx_eth_data;

static struct resource ep93xx_eth_resource[] = {
      {
            .start      = EP93XX_ETHERNET_PHYS_BASE,
            .end  = EP93XX_ETHERNET_PHYS_BASE + 0xffff,
            .flags      = IORESOURCE_MEM,
      }, {
            .start      = IRQ_EP93XX_ETHERNET,
            .end  = IRQ_EP93XX_ETHERNET,
            .flags      = IORESOURCE_IRQ,
      }
};

static struct platform_device ep93xx_eth_device = {
      .name       = "ep93xx-eth",
      .id         = -1,
      .dev        = {
            .platform_data    = &ep93xx_eth_data,
      },
      .num_resources    = ARRAY_SIZE(ep93xx_eth_resource),
      .resource   = ep93xx_eth_resource,
};

/**
 * ep93xx_register_eth - Register the built-in ethernet platform device.
 * @data:   platform specific ethernet configuration (__initdata)
 * @copy_addr:    flag indicating that the MAC address should be copied
 *          from the IndAd registers (as programmed by the bootloader)
 */
void __init ep93xx_register_eth(struct ep93xx_eth_data *data, int copy_addr)
{
      if (copy_addr)
            memcpy_fromio(data->dev_addr, EP93XX_ETHERNET_BASE + 0x50, 6);

      ep93xx_eth_data = *data;
      platform_device_register(&ep93xx_eth_device);
}


/*************************************************************************
 * EP93xx i2c peripheral handling
 *************************************************************************/
static struct i2c_gpio_platform_data ep93xx_i2c_data;

static struct platform_device ep93xx_i2c_device = {
      .name       = "i2c-gpio",
      .id         = 0,
      .dev        = {
            .platform_data    = &ep93xx_i2c_data,
      },
};

/**
 * ep93xx_register_i2c - Register the i2c platform device.
 * @data:   platform specific i2c-gpio configuration (__initdata)
 * @devices:      platform specific i2c bus device information (__initdata)
 * @num:    the number of devices on the i2c bus
 */
void __init ep93xx_register_i2c(struct i2c_gpio_platform_data *data,
                        struct i2c_board_info *devices, int num)
{
      /*
       * Set the EEPROM interface pin drive type control.
       * Defines the driver type for the EECLK and EEDAT pins as either
       * open drain, which will require an external pull-up, or a normal
       * CMOS driver.
       */
      if (data->sda_is_open_drain && data->sda_pin != EP93XX_GPIO_LINE_EEDAT)
            pr_warning("sda != EEDAT, open drain has no effect\n");
      if (data->scl_is_open_drain && data->scl_pin != EP93XX_GPIO_LINE_EECLK)
            pr_warning("scl != EECLK, open drain has no effect\n");

      __raw_writel((data->sda_is_open_drain << 1) |
                 (data->scl_is_open_drain << 0),
                 EP93XX_GPIO_EEDRIVE);

      ep93xx_i2c_data = *data;
      i2c_register_board_info(0, devices, num);
      platform_device_register(&ep93xx_i2c_device);
}

/*************************************************************************
 * EP93xx SPI peripheral handling
 *************************************************************************/
static struct ep93xx_spi_info ep93xx_spi_master_data;

static struct resource ep93xx_spi_resources[] = {
      {
            .start      = EP93XX_SPI_PHYS_BASE,
            .end  = EP93XX_SPI_PHYS_BASE + 0x18 - 1,
            .flags      = IORESOURCE_MEM,
      },
      {
            .start      = IRQ_EP93XX_SSP,
            .end  = IRQ_EP93XX_SSP,
            .flags      = IORESOURCE_IRQ,
      },
};

static struct platform_device ep93xx_spi_device = {
      .name       = "ep93xx-spi",
      .id         = 0,
      .dev        = {
            .platform_data = &ep93xx_spi_master_data,
      },
      .num_resources    = ARRAY_SIZE(ep93xx_spi_resources),
      .resource   = ep93xx_spi_resources,
};

/**
 * ep93xx_register_spi() - registers spi platform device
 * @info: ep93xx board specific spi master info (__initdata)
 * @devices: SPI devices to register (__initdata)
 * @num: number of SPI devices to register
 *
 * This function registers platform device for the EP93xx SPI controller and
 * also makes sure that SPI pins are muxed so that I2S is not using those pins.
 */
void __init ep93xx_register_spi(struct ep93xx_spi_info *info,
                        struct spi_board_info *devices, int num)
{
      /*
       * When SPI is used, we need to make sure that I2S is muxed off from
       * SPI pins.
       */
      ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_I2SONSSP);

      ep93xx_spi_master_data = *info;
      spi_register_board_info(devices, num);
      platform_device_register(&ep93xx_spi_device);
}

/*************************************************************************
 * EP93xx LEDs
 *************************************************************************/
static struct gpio_led ep93xx_led_pins[] = {
      {
            .name = "platform:grled",
            .gpio = EP93XX_GPIO_LINE_GRLED,
      }, {
            .name = "platform:rdled",
            .gpio = EP93XX_GPIO_LINE_RDLED,
      },
};

static struct gpio_led_platform_data ep93xx_led_data = {
      .num_leds   = ARRAY_SIZE(ep93xx_led_pins),
      .leds       = ep93xx_led_pins,
};

static struct platform_device ep93xx_leds = {
      .name       = "leds-gpio",
      .id         = -1,
      .dev        = {
            .platform_data    = &ep93xx_led_data,
      },
};


/*************************************************************************
 * EP93xx pwm peripheral handling
 *************************************************************************/
static struct resource ep93xx_pwm0_resource[] = {
      {
            .start      = EP93XX_PWM_PHYS_BASE,
            .end  = EP93XX_PWM_PHYS_BASE + 0x10 - 1,
            .flags      = IORESOURCE_MEM,
      },
};

static struct platform_device ep93xx_pwm0_device = {
      .name       = "ep93xx-pwm",
      .id         = 0,
      .num_resources    = ARRAY_SIZE(ep93xx_pwm0_resource),
      .resource   = ep93xx_pwm0_resource,
};

static struct resource ep93xx_pwm1_resource[] = {
      {
            .start      = EP93XX_PWM_PHYS_BASE + 0x20,
            .end  = EP93XX_PWM_PHYS_BASE + 0x30 - 1,
            .flags      = IORESOURCE_MEM,
      },
};

static struct platform_device ep93xx_pwm1_device = {
      .name       = "ep93xx-pwm",
      .id         = 1,
      .num_resources    = ARRAY_SIZE(ep93xx_pwm1_resource),
      .resource   = ep93xx_pwm1_resource,
};

void __init ep93xx_register_pwm(int pwm0, int pwm1)
{
      if (pwm0)
            platform_device_register(&ep93xx_pwm0_device);

      /* NOTE: EP9307 does not have PWMOUT1 (pin EGPIO14) */
      if (pwm1)
            platform_device_register(&ep93xx_pwm1_device);
}

int ep93xx_pwm_acquire_gpio(struct platform_device *pdev)
{
      int err;

      if (pdev->id == 0) {
            err = 0;
      } else if (pdev->id == 1) {
            err = gpio_request(EP93XX_GPIO_LINE_EGPIO14,
                           dev_name(&pdev->dev));
            if (err)
                  return err;
            err = gpio_direction_output(EP93XX_GPIO_LINE_EGPIO14, 0);
            if (err)
                  goto fail;

            /* PWM 1 output on EGPIO[14] */
            ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_PONG);
      } else {
            err = -ENODEV;
      }

      return err;

fail:
      gpio_free(EP93XX_GPIO_LINE_EGPIO14);
      return err;
}
EXPORT_SYMBOL(ep93xx_pwm_acquire_gpio);

void ep93xx_pwm_release_gpio(struct platform_device *pdev)
{
      if (pdev->id == 1) {
            gpio_direction_input(EP93XX_GPIO_LINE_EGPIO14);
            gpio_free(EP93XX_GPIO_LINE_EGPIO14);

            /* EGPIO[14] used for GPIO */
            ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_PONG);
      }
}
EXPORT_SYMBOL(ep93xx_pwm_release_gpio);


/*************************************************************************
 * EP93xx video peripheral handling
 *************************************************************************/
static struct ep93xxfb_mach_info ep93xxfb_data;

static struct resource ep93xx_fb_resource[] = {
      {
            .start            = EP93XX_RASTER_PHYS_BASE,
            .end        = EP93XX_RASTER_PHYS_BASE + 0x800 - 1,
            .flags            = IORESOURCE_MEM,
      },
};

static struct platform_device ep93xx_fb_device = {
      .name             = "ep93xx-fb",
      .id               = -1,
      .dev              = {
            .platform_data          = &ep93xxfb_data,
            .coherent_dma_mask      = DMA_BIT_MASK(32),
            .dma_mask         = &ep93xx_fb_device.dev.coherent_dma_mask,
      },
      .num_resources          = ARRAY_SIZE(ep93xx_fb_resource),
      .resource         = ep93xx_fb_resource,
};

static struct platform_device ep93xx_bl_device = {
      .name       = "ep93xx-bl",
      .id         = -1,
};

/**
 * ep93xx_register_fb - Register the framebuffer platform device.
 * @data:   platform specific framebuffer configuration (__initdata)
 */
void __init ep93xx_register_fb(struct ep93xxfb_mach_info *data)
{
      ep93xxfb_data = *data;
      platform_device_register(&ep93xx_fb_device);
      platform_device_register(&ep93xx_bl_device);
}


/*************************************************************************
 * EP93xx matrix keypad peripheral handling
 *************************************************************************/
static struct ep93xx_keypad_platform_data ep93xx_keypad_data;

static struct resource ep93xx_keypad_resource[] = {
      {
            .start      = EP93XX_KEY_MATRIX_PHYS_BASE,
            .end  = EP93XX_KEY_MATRIX_PHYS_BASE + 0x0c - 1,
            .flags      = IORESOURCE_MEM,
      }, {
            .start      = IRQ_EP93XX_KEY,
            .end  = IRQ_EP93XX_KEY,
            .flags      = IORESOURCE_IRQ,
      },
};

static struct platform_device ep93xx_keypad_device = {
      .name       = "ep93xx-keypad",
      .id         = -1,
      .dev        = {
            .platform_data    = &ep93xx_keypad_data,
      },
      .num_resources    = ARRAY_SIZE(ep93xx_keypad_resource),
      .resource   = ep93xx_keypad_resource,
};

/**
 * ep93xx_register_keypad - Register the keypad platform device.
 * @data:   platform specific keypad configuration (__initdata)
 */
void __init ep93xx_register_keypad(struct ep93xx_keypad_platform_data *data)
{
      ep93xx_keypad_data = *data;
      platform_device_register(&ep93xx_keypad_device);
}

int ep93xx_keypad_acquire_gpio(struct platform_device *pdev)
{
      int err;
      int i;

      for (i = 0; i < 8; i++) {
            err = gpio_request(EP93XX_GPIO_LINE_C(i), dev_name(&pdev->dev));
            if (err)
                  goto fail_gpio_c;
            err = gpio_request(EP93XX_GPIO_LINE_D(i), dev_name(&pdev->dev));
            if (err)
                  goto fail_gpio_d;
      }

      /* Enable the keypad controller; GPIO ports C and D used for keypad */
      ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_KEYS |
                         EP93XX_SYSCON_DEVCFG_GONK);

      return 0;

fail_gpio_d:
      gpio_free(EP93XX_GPIO_LINE_C(i));
fail_gpio_c:
      for ( ; i >= 0; --i) {
            gpio_free(EP93XX_GPIO_LINE_C(i));
            gpio_free(EP93XX_GPIO_LINE_D(i));
      }
      return err;
}
EXPORT_SYMBOL(ep93xx_keypad_acquire_gpio);

void ep93xx_keypad_release_gpio(struct platform_device *pdev)
{
      int i;

      for (i = 0; i < 8; i++) {
            gpio_free(EP93XX_GPIO_LINE_C(i));
            gpio_free(EP93XX_GPIO_LINE_D(i));
      }

      /* Disable the keypad controller; GPIO ports C and D used for GPIO */
      ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_KEYS |
                         EP93XX_SYSCON_DEVCFG_GONK);
}
EXPORT_SYMBOL(ep93xx_keypad_release_gpio);

/*************************************************************************
 * EP93xx I2S audio peripheral handling
 *************************************************************************/
static struct resource ep93xx_i2s_resource[] = {
      {
            .start      = EP93XX_I2S_PHYS_BASE,
            .end  = EP93XX_I2S_PHYS_BASE + 0x100 - 1,
            .flags      = IORESOURCE_MEM,
      },
};

static struct platform_device ep93xx_i2s_device = {
      .name       = "ep93xx-i2s",
      .id         = -1,
      .num_resources    = ARRAY_SIZE(ep93xx_i2s_resource),
      .resource   = ep93xx_i2s_resource,
};

static struct platform_device ep93xx_pcm_device = {
      .name       = "ep93xx-pcm-audio",
      .id         = -1,
};

void __init ep93xx_register_i2s(void)
{
      platform_device_register(&ep93xx_i2s_device);
      platform_device_register(&ep93xx_pcm_device);
}

#define EP93XX_SYSCON_DEVCFG_I2S_MASK     (EP93XX_SYSCON_DEVCFG_I2SONSSP | \
                               EP93XX_SYSCON_DEVCFG_I2SONAC97)

#define EP93XX_I2SCLKDIV_MASK       (EP93XX_SYSCON_I2SCLKDIV_ORIDE | \
                               EP93XX_SYSCON_I2SCLKDIV_SPOL)

int ep93xx_i2s_acquire(unsigned i2s_pins, unsigned i2s_config)
{
      unsigned val;

      /* Sanity check */
      if (i2s_pins & ~EP93XX_SYSCON_DEVCFG_I2S_MASK)
            return -EINVAL;
      if (i2s_config & ~EP93XX_I2SCLKDIV_MASK)
            return -EINVAL;

      /* Must have only one of I2SONSSP/I2SONAC97 set */
      if ((i2s_pins & EP93XX_SYSCON_DEVCFG_I2SONSSP) ==
          (i2s_pins & EP93XX_SYSCON_DEVCFG_I2SONAC97))
            return -EINVAL;

      ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_I2S_MASK);
      ep93xx_devcfg_set_bits(i2s_pins);

      /*
       * This is potentially racy with the clock api for i2s_mclk, sclk and 
       * lrclk. Since the i2s driver is the only user of those clocks we
       * rely on it to prevent parallel use of this function and the 
       * clock api for the i2s clocks.
       */
      val = __raw_readl(EP93XX_SYSCON_I2SCLKDIV);
      val &= ~EP93XX_I2SCLKDIV_MASK;
      val |= i2s_config;
      ep93xx_syscon_swlocked_write(val, EP93XX_SYSCON_I2SCLKDIV);

      return 0;
}
EXPORT_SYMBOL(ep93xx_i2s_acquire);

void ep93xx_i2s_release(void)
{
      ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_I2S_MASK);
}
EXPORT_SYMBOL(ep93xx_i2s_release);

/*************************************************************************
 * EP93xx AC97 audio peripheral handling
 *************************************************************************/
static struct resource ep93xx_ac97_resources[] = {
      {
            .start      = EP93XX_AAC_PHYS_BASE,
            .end  = EP93XX_AAC_PHYS_BASE + 0xb0 - 1,
            .flags      = IORESOURCE_MEM,
      },
      {
            .start      = IRQ_EP93XX_AACINTR,
            .end  = IRQ_EP93XX_AACINTR,
            .flags      = IORESOURCE_IRQ,
      },
};

static struct platform_device ep93xx_ac97_device = {
      .name       = "ep93xx-ac97",
      .id         = -1,
      .num_resources    = ARRAY_SIZE(ep93xx_ac97_resources),
      .resource   = ep93xx_ac97_resources,
};

void __init ep93xx_register_ac97(void)
{
      /*
       * Make sure that the AC97 pins are not used by I2S.
       */
      ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_I2SONAC97);

      platform_device_register(&ep93xx_ac97_device);
      platform_device_register(&ep93xx_pcm_device);
}

extern void ep93xx_gpio_init(void);

void __init ep93xx_init_devices(void)
{
      /* Disallow access to MaverickCrunch initially */
      ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_CPENA);

      ep93xx_gpio_init();

      amba_device_register(&uart1_device, &iomem_resource);
      amba_device_register(&uart2_device, &iomem_resource);
      amba_device_register(&uart3_device, &iomem_resource);

      platform_device_register(&ep93xx_rtc_device);
      platform_device_register(&ep93xx_ohci_device);
      platform_device_register(&ep93xx_leds);
}

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