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viper.c

/*
 *  linux/arch/arm/mach-pxa/viper.c
 *
 *  Support for the Arcom VIPER SBC.
 *
 *  Author: Ian Campbell
 *  Created:    Feb 03, 2003
 *  Copyright:  Arcom Control Systems
 *
 *  Maintained by Marc Zyngier <maz@misterjones.org>
 *                             <marc.zyngier@altran.com>
 *
 * Based on lubbock.c:
 *  Author: Nicolas Pitre
 *  Created:      Jun 15, 2001
 *  Copyright:    MontaVista Software Inc.
 *
 *  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.
 */

#include <linux/types.h>
#include <linux/memory.h>
#include <linux/cpu.h>
#include <linux/cpufreq.h>
#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/major.h>
#include <linux/module.h>
#include <linux/pm.h>
#include <linux/sched.h>
#include <linux/gpio.h>
#include <linux/i2c-gpio.h>
#include <linux/serial_8250.h>
#include <linux/smc91x.h>
#include <linux/pwm_backlight.h>
#include <linux/usb/isp116x.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/physmap.h>

#include <mach/pxa-regs.h>
#include <mach/pxa2xx-regs.h>
#include <mach/bitfield.h>
#include <mach/audio.h>
#include <mach/pxafb.h>
#include <mach/mfp-pxa25x.h>
#include <mach/i2c.h>
#include <mach/viper.h>

#include <asm/setup.h>
#include <asm/mach-types.h>
#include <asm/irq.h>
#include <asm/sizes.h>

#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include <asm/mach/irq.h>

#include "generic.h"
#include "devices.h"

static unsigned int icr;

static void viper_icr_set_bit(unsigned int bit)
{
      icr |= bit;
      VIPER_ICR = icr;
}

static void viper_icr_clear_bit(unsigned int bit)
{
      icr &= ~bit;
      VIPER_ICR = icr;
}

/* This function is used from the pcmcia module to reset the CF */
void viper_cf_rst(int state)
{
      if (state)
            viper_icr_set_bit(VIPER_ICR_CF_RST);
      else
            viper_icr_clear_bit(VIPER_ICR_CF_RST);
}
EXPORT_SYMBOL(viper_cf_rst);

/*
 * The CPLD version register was not present on VIPER boards prior to
 * v2i1. On v1 boards where the version register is not present we
 * will just read back the previous value from the databus.
 *
 * Therefore we do two reads. The first time we write 0 to the
 * (read-only) register before reading and the second time we write
 * 0xff first. If the two reads do not match or they read back as 0xff
 * or 0x00 then we have version 1 hardware.
 */
static u8 viper_hw_version(void)
{
      u8 v1, v2;
      unsigned long flags;

      local_irq_save(flags);

      VIPER_VERSION = 0;
      v1 = VIPER_VERSION;
      VIPER_VERSION = 0xff;
      v2 = VIPER_VERSION;

      v1 = (v1 != v2 || v1 == 0xff) ? 0 : v1;

      local_irq_restore(flags);
      return v1;
}

/* CPU sysdev */
static int viper_cpu_suspend(struct sys_device *sysdev, pm_message_t state)
{
      viper_icr_set_bit(VIPER_ICR_R_DIS);
      return 0;
}

static int viper_cpu_resume(struct sys_device *sysdev)
{
      viper_icr_clear_bit(VIPER_ICR_R_DIS);
      return 0;
}

static struct sysdev_driver viper_cpu_sysdev_driver = {
      .suspend    = viper_cpu_suspend,
      .resume           = viper_cpu_resume,
};

static unsigned int current_voltage_divisor;

/*
 * If force is not true then step from existing to new divisor. If
 * force is true then jump straight to the new divisor. Stepping is
 * used because if the jump in voltage is too large, the VCC can dip
 * too low and the regulator cuts out.
 *
 * force can be used to initialize the divisor to a know state by
 * setting the value for the current clock speed, since we are already
 * running at that speed we know the voltage should be pretty close so
 * the jump won't be too large
 */
static void viper_set_core_cpu_voltage(unsigned long khz, int force)
{
      int i = 0;
      unsigned int divisor = 0;
      const char *v;

      if (khz < 200000) {
            v = "1.0"; divisor = 0xfff;
      } else if (khz < 300000) {
            v = "1.1"; divisor = 0xde5;
      } else {
            v = "1.3"; divisor = 0x325;
      }

      pr_debug("viper: setting CPU core voltage to %sV at %d.%03dMHz\n",
             v, (int)khz / 1000, (int)khz % 1000);

#define STEP 0x100
      do {
            int step;

            if (force)
                  step = divisor;
            else if (current_voltage_divisor < divisor - STEP)
                  step = current_voltage_divisor + STEP;
            else if (current_voltage_divisor > divisor + STEP)
                  step = current_voltage_divisor - STEP;
            else
                  step = divisor;
            force = 0;

            gpio_set_value(VIPER_PSU_CLK_GPIO, 0);
            gpio_set_value(VIPER_PSU_nCS_LD_GPIO, 0);

            for (i = 1 << 11 ; i > 0 ; i >>= 1) {
                  udelay(1);

                  gpio_set_value(VIPER_PSU_DATA_GPIO, step & i);
                  udelay(1);

                  gpio_set_value(VIPER_PSU_CLK_GPIO, 1);
                  udelay(1);

                  gpio_set_value(VIPER_PSU_CLK_GPIO, 0);
            }
            udelay(1);

            gpio_set_value(VIPER_PSU_nCS_LD_GPIO, 1);
            udelay(1);

            gpio_set_value(VIPER_PSU_nCS_LD_GPIO, 0);

            current_voltage_divisor = step;
      } while (current_voltage_divisor != divisor);
}

/* Interrupt handling */
static unsigned long viper_irq_enabled_mask;
static const int viper_isa_irqs[] = { 3, 4, 5, 6, 7, 10, 11, 12, 9, 14, 15 };
static const int viper_isa_irq_map[] = {
      0,          /* ISA irq #0, invalid */
      0,          /* ISA irq #1, invalid */
      0,          /* ISA irq #2, invalid */
      1 << 0,           /* ISA irq #3 */
      1 << 1,           /* ISA irq #4 */
      1 << 2,           /* ISA irq #5 */
      1 << 3,           /* ISA irq #6 */
      1 << 4,           /* ISA irq #7 */
      0,          /* ISA irq #8, invalid */
      1 << 8,           /* ISA irq #9 */
      1 << 5,           /* ISA irq #10 */
      1 << 6,           /* ISA irq #11 */
      1 << 7,           /* ISA irq #12 */
      0,          /* ISA irq #13, invalid */
      1 << 9,           /* ISA irq #14 */
      1 << 10,    /* ISA irq #15 */
};

static inline int viper_irq_to_bitmask(unsigned int irq)
{
      return viper_isa_irq_map[irq - PXA_ISA_IRQ(0)];
}

static inline int viper_bit_to_irq(int bit)
{
      return viper_isa_irqs[bit] + PXA_ISA_IRQ(0);
}

static void viper_ack_irq(unsigned int irq)
{
      int viper_irq = viper_irq_to_bitmask(irq);

      if (viper_irq & 0xff)
            VIPER_LO_IRQ_STATUS = viper_irq;
      else
            VIPER_HI_IRQ_STATUS = (viper_irq >> 8);
}

static void viper_mask_irq(unsigned int irq)
{
      viper_irq_enabled_mask &= ~(viper_irq_to_bitmask(irq));
}

static void viper_unmask_irq(unsigned int irq)
{
      viper_irq_enabled_mask |= viper_irq_to_bitmask(irq);
}

static inline unsigned long viper_irq_pending(void)
{
      return (VIPER_HI_IRQ_STATUS << 8 | VIPER_LO_IRQ_STATUS) &
                  viper_irq_enabled_mask;
}

static void viper_irq_handler(unsigned int irq, struct irq_desc *desc)
{
      unsigned long pending;

      pending = viper_irq_pending();
      do {
            /* we're in a chained irq handler,
             * so ack the interrupt by hand */
            GEDR(VIPER_CPLD_GPIO) = GPIO_bit(VIPER_CPLD_GPIO);

            if (likely(pending)) {
                  irq = viper_bit_to_irq(__ffs(pending));
                  generic_handle_irq(irq);
            }
            pending = viper_irq_pending();
      } while (pending);
}

static struct irq_chip viper_irq_chip = {
      .name = "ISA",
      .ack  = viper_ack_irq,
      .mask = viper_mask_irq,
      .unmask     = viper_unmask_irq
};

static void __init viper_init_irq(void)
{
      int level;
      int isa_irq;

      pxa25x_init_irq();

      /* setup ISA IRQs */
      for (level = 0; level < ARRAY_SIZE(viper_isa_irqs); level++) {
            isa_irq = viper_bit_to_irq(level);
            set_irq_chip(isa_irq, &viper_irq_chip);
            set_irq_handler(isa_irq, handle_edge_irq);
            set_irq_flags(isa_irq, IRQF_VALID | IRQF_PROBE);
      }

      set_irq_chained_handler(gpio_to_irq(VIPER_CPLD_GPIO),
                        viper_irq_handler);
      set_irq_type(gpio_to_irq(VIPER_CPLD_GPIO), IRQ_TYPE_EDGE_BOTH);

#ifndef CONFIG_SERIAL_PXA
      /*
       * 8250 doesn't support IRQ_TYPE being passed as part
       * of the plat_serial8250_port structure...
       */
      set_irq_type(gpio_to_irq(VIPER_UARTA_GPIO), IRQ_TYPE_EDGE_RISING);
      set_irq_type(gpio_to_irq(VIPER_UARTB_GPIO), IRQ_TYPE_EDGE_RISING);
#endif
}

/* Flat Panel */
static struct pxafb_mode_info fb_mode_info[] = {
      {
            .pixclock   = 157500,

            .xres       = 320,
            .yres       = 240,

            .bpp        = 16,

            .hsync_len  = 63,
            .left_margin      = 7,
            .right_margin     = 13,

            .vsync_len  = 20,
            .upper_margin     = 0,
            .lower_margin     = 0,

            .sync       = 0,
      },
};

static struct pxafb_mach_info fb_info = {
      .modes                  = fb_mode_info,
      .num_modes        = 1,
      .lcd_conn         = LCD_COLOR_TFT_16BPP | LCD_PCLK_EDGE_FALL,
};

static int viper_backlight_init(struct device *dev)
{
      int ret;

      /* GPIO9 and 10 control FB backlight. Initialise to off */
      ret = gpio_request(VIPER_BCKLIGHT_EN_GPIO, "Backlight");
      if (ret)
            goto err_request_bckl;

      ret = gpio_request(VIPER_LCD_EN_GPIO, "LCD");
      if (ret)
            goto err_request_lcd;

      ret = gpio_direction_output(VIPER_BCKLIGHT_EN_GPIO, 0);
      if (ret)
            goto err_dir;

      ret = gpio_direction_output(VIPER_LCD_EN_GPIO, 0);
      if (ret)
            goto err_dir;

      return 0;

err_dir:
      gpio_free(VIPER_LCD_EN_GPIO);
err_request_lcd:
      gpio_free(VIPER_BCKLIGHT_EN_GPIO);
err_request_bckl:
      dev_err(dev, "Failed to setup LCD GPIOs\n");

      return ret;
}

static int viper_backlight_notify(int brightness)
{
      gpio_set_value(VIPER_LCD_EN_GPIO, !!brightness);
      gpio_set_value(VIPER_BCKLIGHT_EN_GPIO, !!brightness);

      return brightness;
}

static void viper_backlight_exit(struct device *dev)
{
      gpio_free(VIPER_LCD_EN_GPIO);
      gpio_free(VIPER_BCKLIGHT_EN_GPIO);
}

static struct platform_pwm_backlight_data viper_backlight_data = {
      .pwm_id           = 0,
      .max_brightness   = 100,
      .dft_brightness   = 100,
      .pwm_period_ns    = 1000000,
      .init       = viper_backlight_init,
      .notify           = viper_backlight_notify,
      .exit       = viper_backlight_exit,
};

static struct platform_device viper_backlight_device = {
      .name       = "pwm-backlight",
      .dev        = {
            .parent           = &pxa25x_device_pwm0.dev,
            .platform_data    = &viper_backlight_data,
      },
};

/* Ethernet */
static struct resource smc91x_resources[] = {
      [0] = {
            .name = "smc91x-regs",
            .start  = VIPER_ETH_PHYS + 0x300,
            .end    = VIPER_ETH_PHYS + 0x30f,
            .flags  = IORESOURCE_MEM,
      },
      [1] = {
            .start  = gpio_to_irq(VIPER_ETH_GPIO),
            .end    = gpio_to_irq(VIPER_ETH_GPIO),
            .flags  = IORESOURCE_IRQ | IORESOURCE_IRQ_HIGHEDGE,
      },
      [2] = {
            .name = "smc91x-data32",
            .start  = VIPER_ETH_DATA_PHYS,
            .end    = VIPER_ETH_DATA_PHYS + 3,
            .flags  = IORESOURCE_MEM,
      },
};

static struct smc91x_platdata viper_smc91x_info = {
      .flags      = SMC91X_USE_16BIT | SMC91X_NOWAIT,
      .leda = RPC_LED_100_10,
      .ledb = RPC_LED_TX_RX,
};

static struct platform_device smc91x_device = {
      .name       = "smc91x",
      .id         = -1,
      .num_resources  = ARRAY_SIZE(smc91x_resources),
      .resource       = smc91x_resources,
      .dev        = {
            .platform_data    = &viper_smc91x_info,
      },
};

/* i2c */
static struct i2c_gpio_platform_data i2c_bus_data = {
      .sda_pin = VIPER_RTC_I2C_SDA_GPIO,
      .scl_pin = VIPER_RTC_I2C_SCL_GPIO,
      .udelay  = 10,
      .timeout = 100,
};

static struct platform_device i2c_bus_device = {
      .name       = "i2c-gpio",
      .id         = 1, /* pxa2xx-i2c is bus 0, so start at 1 */
      .dev = {
            .platform_data = &i2c_bus_data,
      }
};

static struct i2c_board_info __initdata viper_i2c_devices[] = {
      {
            I2C_BOARD_INFO("ds1338", 0x68),
      },
};

/*
 * Serial configuration:
 * You can either have the standard PXA ports driven by the PXA driver,
 * or all the ports (PXA + 16850) driven by the 8250 driver.
 * Choose your poison.
 */

static struct resource viper_serial_resources[] = {
#ifndef CONFIG_SERIAL_PXA
      {
            .start      = 0x40100000,
            .end  = 0x4010001f,
            .flags      = IORESOURCE_MEM,
      },
      {
            .start      = 0x40200000,
            .end  = 0x4020001f,
            .flags      = IORESOURCE_MEM,
      },
      {
            .start      = 0x40700000,
            .end  = 0x4070001f,
            .flags      = IORESOURCE_MEM,
      },
      {
            .start      = VIPER_UARTA_PHYS,
            .end  = VIPER_UARTA_PHYS + 0xf,
            .flags      = IORESOURCE_MEM,
      },
      {
            .start      = VIPER_UARTB_PHYS,
            .end  = VIPER_UARTB_PHYS + 0xf,
            .flags      = IORESOURCE_MEM,
      },
#else
      {
            0,
      },
#endif
};

static struct plat_serial8250_port serial_platform_data[] = {
#ifndef CONFIG_SERIAL_PXA
      /* Internal UARTs */
      {
            .membase    = (void *)&FFUART,
            .mapbase    = __PREG(FFUART),
            .irq        = IRQ_FFUART,
            .uartclk    = 921600 * 16,
            .regshift   = 2,
            .flags            = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
            .iotype           = UPIO_MEM,
      },
      {
            .membase    = (void *)&BTUART,
            .mapbase    = __PREG(BTUART),
            .irq        = IRQ_BTUART,
            .uartclk    = 921600 * 16,
            .regshift   = 2,
            .flags            = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
            .iotype           = UPIO_MEM,
      },
      {
            .membase    = (void *)&STUART,
            .mapbase    = __PREG(STUART),
            .irq        = IRQ_STUART,
            .uartclk    = 921600 * 16,
            .regshift   = 2,
            .flags            = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
            .iotype           = UPIO_MEM,
      },
      /* External UARTs */
      {
            .mapbase    = VIPER_UARTA_PHYS,
            .irq        = gpio_to_irq(VIPER_UARTA_GPIO),
            .uartclk    = 1843200,
            .regshift   = 1,
            .iotype           = UPIO_MEM,
            .flags            = UPF_BOOT_AUTOCONF | UPF_IOREMAP |
                          UPF_SKIP_TEST,
      },
      {
            .mapbase    = VIPER_UARTB_PHYS,
            .irq        = gpio_to_irq(VIPER_UARTB_GPIO),
            .uartclk    = 1843200,
            .regshift   = 1,
            .iotype           = UPIO_MEM,
            .flags            = UPF_BOOT_AUTOCONF | UPF_IOREMAP |
                          UPF_SKIP_TEST,
      },
#endif
      { },
};

static struct platform_device serial_device = {
      .name             = "serial8250",
      .id               = 0,
      .dev              = {
            .platform_data    = serial_platform_data,
      },
      .num_resources          = ARRAY_SIZE(viper_serial_resources),
      .resource         = viper_serial_resources,
};

/* USB */
static void isp116x_delay(struct device *dev, int delay)
{
      ndelay(delay);
}

static struct resource isp116x_resources[] = {
      [0] = { /* DATA */
            .start  = VIPER_USB_PHYS + 0,
            .end    = VIPER_USB_PHYS + 1,
            .flags  = IORESOURCE_MEM,
      },
      [1] = { /* ADDR */
            .start  = VIPER_USB_PHYS + 2,
            .end    = VIPER_USB_PHYS + 3,
            .flags  = IORESOURCE_MEM,
      },
      [2] = {
            .start  = gpio_to_irq(VIPER_USB_GPIO),
            .end    = gpio_to_irq(VIPER_USB_GPIO),
            .flags  = IORESOURCE_IRQ | IORESOURCE_IRQ_HIGHEDGE,
      },
};

/* (DataBusWidth16|AnalogOCEnable|DREQOutputPolarity|DownstreamPort15KRSel ) */
static struct isp116x_platform_data isp116x_platform_data = {
      /* Enable internal resistors on downstream ports */
      .sel15Kres        = 1,
      /* On-chip overcurrent protection */
      .oc_enable        = 1,
      /* INT output polarity */
      .int_act_high           = 1,
      /* INT edge or level triggered */
      .int_edge_triggered     = 0,

      /* WAKEUP pin connected - NOT SUPPORTED  */
      /* .remote_wakeup_connected = 0, */
      /* Wakeup by devices on usb bus enabled */
      .remote_wakeup_enable   = 0,
      .delay                  = isp116x_delay,
};

static struct platform_device isp116x_device = {
      .name             = "isp116x-hcd",
      .id               = -1,
      .num_resources    = ARRAY_SIZE(isp116x_resources),
      .resource         = isp116x_resources,
      .dev              = {
            .platform_data    = &isp116x_platform_data,
      },

};

/* MTD */
static struct resource mtd_resources[] = {
      [0] = {     /* RedBoot config + filesystem flash */
            .start      = VIPER_FLASH_PHYS,
            .end  = VIPER_FLASH_PHYS + SZ_32M - 1,
            .flags      = IORESOURCE_MEM,
      },
      [1] = {     /* Boot flash */
            .start      = VIPER_BOOT_PHYS,
            .end  = VIPER_BOOT_PHYS + SZ_1M - 1,
            .flags      = IORESOURCE_MEM,
      },
      [2] = { /*
             * SRAM size is actually 256KB, 8bits, with a sparse mapping
             * (each byte is on a 16bit boundary).
             */
            .start      = _VIPER_SRAM_BASE,
            .end  = _VIPER_SRAM_BASE + SZ_512K - 1,
            .flags      = IORESOURCE_MEM,
      },
};

static struct mtd_partition viper_boot_flash_partition = {
      .name       = "RedBoot",
      .size       = SZ_1M,
      .offset           = 0,
      .mask_flags = MTD_WRITEABLE,  /* force R/O */
};

static struct physmap_flash_data viper_flash_data[] = {
      [0] = {
            .width            = 2,
            .parts            = NULL,
            .nr_parts   = 0,
      },
      [1] = {
            .width            = 2,
            .parts            = &viper_boot_flash_partition,
            .nr_parts   = 1,
      },
};

static struct platform_device viper_mtd_devices[] = {
      [0] = {
            .name       = "physmap-flash",
            .id         = 0,
            .dev        = {
                  .platform_data    = &viper_flash_data[0],
            },
            .resource   = &mtd_resources[0],
            .num_resources    = 1,
      },
      [1] = {
            .name       = "physmap-flash",
            .id         = 1,
            .dev        = {
                  .platform_data    = &viper_flash_data[1],
            },
            .resource   = &mtd_resources[1],
            .num_resources    = 1,
      },
};

static struct platform_device *viper_devs[] __initdata = {
      &smc91x_device,
      &i2c_bus_device,
      &serial_device,
      &isp116x_device,
      &viper_mtd_devices[0],
      &viper_mtd_devices[1],
      &viper_backlight_device,
};

static mfp_cfg_t viper_pin_config[] __initdata = {
      /* Chip selects */
      GPIO15_nCS_1,
      GPIO78_nCS_2,
      GPIO79_nCS_3,
      GPIO80_nCS_4,
      GPIO33_nCS_5,

      /* FP Backlight */
      GPIO9_GPIO,                         /* VIPER_BCKLIGHT_EN_GPIO */
      GPIO10_GPIO,                        /* VIPER_LCD_EN_GPIO */
      GPIO16_PWM0_OUT,

      /* Ethernet PHY Ready */
      GPIO18_RDY,

      /* Serial shutdown */
      GPIO12_GPIO | MFP_LPM_DRIVE_HIGH,   /* VIPER_UART_SHDN_GPIO */

      /* Compact-Flash / PC104 */
      GPIO48_nPOE,
      GPIO49_nPWE,
      GPIO50_nPIOR,
      GPIO51_nPIOW,
      GPIO52_nPCE_1,
      GPIO53_nPCE_2,
      GPIO54_nPSKTSEL,
      GPIO55_nPREG,
      GPIO56_nPWAIT,
      GPIO57_nIOIS16,
      GPIO8_GPIO,                   /* VIPER_CF_RDY_GPIO */
      GPIO32_GPIO,                        /* VIPER_CF_CD_GPIO */
      GPIO82_GPIO,                        /* VIPER_CF_POWER_GPIO */

      /* Integrated UPS control */
      GPIO20_GPIO,                        /* VIPER_UPS_GPIO */

      /* Vcc regulator control */
      GPIO6_GPIO,                   /* VIPER_PSU_DATA_GPIO */
      GPIO11_GPIO,                        /* VIPER_PSU_CLK_GPIO */
      GPIO19_GPIO,                        /* VIPER_PSU_nCS_LD_GPIO */

      /* i2c busses */
      GPIO26_GPIO,                        /* VIPER_TPM_I2C_SDA_GPIO */
      GPIO27_GPIO,                        /* VIPER_TPM_I2C_SCL_GPIO */
      GPIO83_GPIO,                        /* VIPER_RTC_I2C_SDA_GPIO */
      GPIO84_GPIO,                        /* VIPER_RTC_I2C_SCL_GPIO */

      /* PC/104 Interrupt */
      GPIO1_GPIO | WAKEUP_ON_EDGE_RISE,   /* VIPER_CPLD_GPIO */
};

static unsigned long viper_tpm;

static int __init viper_tpm_setup(char *str)
{
      strict_strtoul(str, 10, &viper_tpm);
      return 1;
}

__setup("tpm=", viper_tpm_setup);

static void __init viper_tpm_init(void)
{
      struct platform_device *tpm_device;
      struct i2c_gpio_platform_data i2c_tpm_data = {
            .sda_pin = VIPER_TPM_I2C_SDA_GPIO,
            .scl_pin = VIPER_TPM_I2C_SCL_GPIO,
            .udelay  = 10,
            .timeout = 100,
      };
      char *errstr;

      /* Allocate TPM i2c bus if requested */
      if (!viper_tpm)
            return;

      tpm_device = platform_device_alloc("i2c-gpio", 2);
      if (tpm_device) {
            if (!platform_device_add_data(tpm_device,
                                    &i2c_tpm_data,
                                    sizeof(i2c_tpm_data))) {
                  if (platform_device_add(tpm_device)) {
                        errstr = "register TPM i2c bus";
                        goto error_free_tpm;
                  }
            } else {
                  errstr = "allocate TPM i2c bus data";
                  goto error_free_tpm;
            }
      } else {
            errstr = "allocate TPM i2c device";
            goto error_tpm;
      }

      return;

error_free_tpm:
      kfree(tpm_device);
error_tpm:
      pr_err("viper: Couldn't %s, giving up\n", errstr);
}

static void __init viper_init_vcore_gpios(void)
{
      if (gpio_request(VIPER_PSU_DATA_GPIO, "PSU data"))
            goto err_request_data;

      if (gpio_request(VIPER_PSU_CLK_GPIO, "PSU clock"))
            goto err_request_clk;

      if (gpio_request(VIPER_PSU_nCS_LD_GPIO, "PSU cs"))
            goto err_request_cs;

      if (gpio_direction_output(VIPER_PSU_DATA_GPIO, 0) ||
          gpio_direction_output(VIPER_PSU_CLK_GPIO, 0) ||
          gpio_direction_output(VIPER_PSU_nCS_LD_GPIO, 0))
            goto err_dir;

      /* c/should assume redboot set the correct level ??? */
      viper_set_core_cpu_voltage(get_clk_frequency_khz(0), 1);

      return;

err_dir:
      gpio_free(VIPER_PSU_nCS_LD_GPIO);
err_request_cs:
      gpio_free(VIPER_PSU_CLK_GPIO);
err_request_clk:
      gpio_free(VIPER_PSU_DATA_GPIO);
err_request_data:
      pr_err("viper: Failed to setup vcore control GPIOs\n");
}

static void __init viper_init_serial_gpio(void)
{
      if (gpio_request(VIPER_UART_SHDN_GPIO, "UARTs shutdown"))
            goto err_request;

      if (gpio_direction_output(VIPER_UART_SHDN_GPIO, 0))
            goto err_dir;

      return;

err_dir:
      gpio_free(VIPER_UART_SHDN_GPIO);
err_request:
      pr_err("viper: Failed to setup UART shutdown GPIO\n");
}

#ifdef CONFIG_CPU_FREQ
static int viper_cpufreq_notifier(struct notifier_block *nb,
                          unsigned long val, void *data)
{
      struct cpufreq_freqs *freq = data;

      /* TODO: Adjust timings??? */

      switch (val) {
      case CPUFREQ_PRECHANGE:
            if (freq->old < freq->new) {
                  /* we are getting faster so raise the voltage
                   * before we change freq */
                  viper_set_core_cpu_voltage(freq->new, 0);
            }
            break;
      case CPUFREQ_POSTCHANGE:
            if (freq->old > freq->new) {
                  /* we are slowing down so drop the power
                   * after we change freq */
                  viper_set_core_cpu_voltage(freq->new, 0);
            }
            break;
      case CPUFREQ_RESUMECHANGE:
            viper_set_core_cpu_voltage(freq->new, 0);
            break;
      default:
            /* ignore */
            break;
      }

      return 0;
}

static struct notifier_block viper_cpufreq_notifier_block = {
      .notifier_call  = viper_cpufreq_notifier
};

static void __init viper_init_cpufreq(void)
{
      if (cpufreq_register_notifier(&viper_cpufreq_notifier_block,
                              CPUFREQ_TRANSITION_NOTIFIER))
            pr_err("viper: Failed to setup cpufreq notifier\n");
}
#else
static inline void viper_init_cpufreq(void) {}
#endif

static void viper_power_off(void)
{
      pr_notice("Shutting off UPS\n");
      gpio_set_value(VIPER_UPS_GPIO, 1);
      /* Spin to death... */
      while (1);
}

static void __init viper_init(void)
{
      u8 version;

      pm_power_off = viper_power_off;

      pxa2xx_mfp_config(ARRAY_AND_SIZE(viper_pin_config));

      /* Wake-up serial console */
      viper_init_serial_gpio();

      set_pxa_fb_info(&fb_info);

      /* v1 hardware cannot use the datacs line */
      version = viper_hw_version();
      if (version == 0)
            smc91x_device.num_resources--;

      pxa_set_i2c_info(NULL);
      platform_add_devices(viper_devs, ARRAY_SIZE(viper_devs));

      viper_init_vcore_gpios();
      viper_init_cpufreq();

      sysdev_driver_register(&cpu_sysdev_class, &viper_cpu_sysdev_driver);

      if (version) {
            pr_info("viper: hardware v%di%d detected. "
                  "CPLD revision %d.\n",
                  VIPER_BOARD_VERSION(version),
                  VIPER_BOARD_ISSUE(version),
                  VIPER_CPLD_REVISION(version));
            system_rev = (VIPER_BOARD_VERSION(version) << 8) |
                       (VIPER_BOARD_ISSUE(version) << 4) |
                       VIPER_CPLD_REVISION(version);
      } else {
            pr_info("viper: No version register.\n");
      }

      i2c_register_board_info(1, ARRAY_AND_SIZE(viper_i2c_devices));

      viper_tpm_init();
      pxa_set_ac97_info(NULL);
}

static struct map_desc viper_io_desc[] __initdata = {
      {
            .virtual = VIPER_CPLD_BASE,
            .pfn     = __phys_to_pfn(VIPER_CPLD_PHYS),
            .length  = 0x00300000,
            .type    = MT_DEVICE,
      },
      {
            .virtual = VIPER_PC104IO_BASE,
            .pfn     = __phys_to_pfn(_PCMCIA1IO),
            .length  = 0x00800000,
            .type    = MT_DEVICE,
      },
};

static void __init viper_map_io(void)
{
      pxa_map_io();

      iotable_init(viper_io_desc, ARRAY_SIZE(viper_io_desc));

      PCFR |= PCFR_OPDE;
}

MACHINE_START(VIPER, "Arcom/Eurotech VIPER SBC")
      /* Maintainer: Marc Zyngier <maz@misterjones.org> */
      .phys_io    = 0x40000000,
      .io_pg_offst      = (io_p2v(0x40000000) >> 18) & 0xfffc,
      .boot_params      = 0xa0000100,
      .map_io           = viper_map_io,
      .init_irq   = viper_init_irq,
      .timer          = &pxa_timer,
      .init_machine     = viper_init,
MACHINE_END

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