OMAP3: PM: Ensure MUSB block can idle when driver not loaded

[linux-ginger.git] / arch / arm / mach-pxa / 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/pxa25x.h>
#include <mach/audio.h>
#include <mach/pxafb.h>
#include <mach/i2c.h>
#include <mach/regs-uart.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(0x30000000),
                .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