Add linux-next specific files for 20110831

[linux-2.6/next.git] / arch / x86 / platform / mrst / mrst.c

/*
 * mrst.c: Intel Moorestown platform specific setup code
 *
 * (C) Copyright 2008 Intel Corporation
 * Author: Jacob Pan (jacob.jun.pan@intel.com)
 *
 * 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; version 2
 * of the License.
 */

#define pr_fmt(fmt) "mrst: " fmt

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/scatterlist.h>
#include <linux/sfi.h>
#include <linux/intel_pmic_gpio.h>
#include <linux/spi/spi.h>
#include <linux/i2c.h>
#include <linux/i2c/pca953x.h>
#include <linux/gpio_keys.h>
#include <linux/input.h>
#include <linux/platform_device.h>
#include <linux/irq.h>
#include <linux/module.h>

#include <asm/setup.h>
#include <asm/mpspec_def.h>
#include <asm/hw_irq.h>
#include <asm/apic.h>
#include <asm/io_apic.h>
#include <asm/mrst.h>
#include <asm/mrst-vrtc.h>
#include <asm/io.h>
#include <asm/i8259.h>
#include <asm/intel_scu_ipc.h>
#include <asm/apb_timer.h>
#include <asm/reboot.h>

/*
 * the clockevent devices on Moorestown/Medfield can be APBT or LAPIC clock,
 * cmdline option x86_mrst_timer can be used to override the configuration
 * to prefer one or the other.
 * at runtime, there are basically three timer configurations:
 * 1. per cpu apbt clock only
 * 2. per cpu always-on lapic clocks only, this is Penwell/Medfield only
 * 3. per cpu lapic clock (C3STOP) and one apbt clock, with broadcast.
 *
 * by default (without cmdline option), platform code first detects cpu type
 * to see if we are on lincroft or penwell, then set up both lapic or apbt
 * clocks accordingly.
 * i.e. by default, medfield uses configuration #2, moorestown uses #1.
 * config #3 is supported but not recommended on medfield.
 *
 * rating and feature summary:
 * lapic (with C3STOP) --------- 100
 * apbt (always-on) ------------ 110
 * lapic (always-on,ARAT) ------ 150
 */

__cpuinitdata enum mrst_timer_options mrst_timer_options;

static u32 sfi_mtimer_usage[SFI_MTMR_MAX_NUM];
static struct sfi_timer_table_entry sfi_mtimer_array[SFI_MTMR_MAX_NUM];
enum mrst_cpu_type __mrst_cpu_chip;
EXPORT_SYMBOL_GPL(__mrst_cpu_chip);

int sfi_mtimer_num;

struct sfi_rtc_table_entry sfi_mrtc_array[SFI_MRTC_MAX];
EXPORT_SYMBOL_GPL(sfi_mrtc_array);
int sfi_mrtc_num;

/* parse all the mtimer info to a static mtimer array */
static int __init sfi_parse_mtmr(struct sfi_table_header *table)
{
        struct sfi_table_simple *sb;
        struct sfi_timer_table_entry *pentry;
        struct mpc_intsrc mp_irq;
        int totallen;

        sb = (struct sfi_table_simple *)table;
        if (!sfi_mtimer_num) {
                sfi_mtimer_num = SFI_GET_NUM_ENTRIES(sb,
                                        struct sfi_timer_table_entry);
                pentry = (struct sfi_timer_table_entry *) sb->pentry;
                totallen = sfi_mtimer_num * sizeof(*pentry);
                memcpy(sfi_mtimer_array, pentry, totallen);
        }

        pr_debug("SFI MTIMER info (num = %d):\n", sfi_mtimer_num);
        pentry = sfi_mtimer_array;
        for (totallen = 0; totallen < sfi_mtimer_num; totallen++, pentry++) {
                pr_debug("timer[%d]: paddr = 0x%08x, freq = %dHz,"
                        " irq = %d\n", totallen, (u32)pentry->phys_addr,
                        pentry->freq_hz, pentry->irq);
                        if (!pentry->irq)
                                continue;
                        mp_irq.type = MP_INTSRC;
                        mp_irq.irqtype = mp_INT;
/* triggering mode edge bit 2-3, active high polarity bit 0-1 */
                        mp_irq.irqflag = 5;
                        mp_irq.srcbus = MP_BUS_ISA;
                        mp_irq.srcbusirq = pentry->irq; /* IRQ */
                        mp_irq.dstapic = MP_APIC_ALL;
                        mp_irq.dstirq = pentry->irq;
                        mp_save_irq(&mp_irq);
        }

        return 0;
}

struct sfi_timer_table_entry *sfi_get_mtmr(int hint)
{
        int i;
        if (hint < sfi_mtimer_num) {
                if (!sfi_mtimer_usage[hint]) {
                        pr_debug("hint taken for timer %d irq %d\n",\
                                hint, sfi_mtimer_array[hint].irq);
                        sfi_mtimer_usage[hint] = 1;
                        return &sfi_mtimer_array[hint];
                }
        }
        /* take the first timer available */
        for (i = 0; i < sfi_mtimer_num;) {
                if (!sfi_mtimer_usage[i]) {
                        sfi_mtimer_usage[i] = 1;
                        return &sfi_mtimer_array[i];
                }
                i++;
        }
        return NULL;
}

void sfi_free_mtmr(struct sfi_timer_table_entry *mtmr)
{
        int i;
        for (i = 0; i < sfi_mtimer_num;) {
                if (mtmr->irq == sfi_mtimer_array[i].irq) {
                        sfi_mtimer_usage[i] = 0;
                        return;
                }
                i++;
        }
}

/* parse all the mrtc info to a global mrtc array */
int __init sfi_parse_mrtc(struct sfi_table_header *table)
{
        struct sfi_table_simple *sb;
        struct sfi_rtc_table_entry *pentry;
        struct mpc_intsrc mp_irq;

        int totallen;

        sb = (struct sfi_table_simple *)table;
        if (!sfi_mrtc_num) {
                sfi_mrtc_num = SFI_GET_NUM_ENTRIES(sb,
                                                struct sfi_rtc_table_entry);
                pentry = (struct sfi_rtc_table_entry *)sb->pentry;
                totallen = sfi_mrtc_num * sizeof(*pentry);
                memcpy(sfi_mrtc_array, pentry, totallen);
        }

        pr_debug("SFI RTC info (num = %d):\n", sfi_mrtc_num);
        pentry = sfi_mrtc_array;
        for (totallen = 0; totallen < sfi_mrtc_num; totallen++, pentry++) {
                pr_debug("RTC[%d]: paddr = 0x%08x, irq = %d\n",
                        totallen, (u32)pentry->phys_addr, pentry->irq);
                mp_irq.type = MP_INTSRC;
                mp_irq.irqtype = mp_INT;
                mp_irq.irqflag = 0xf;   /* level trigger and active low */
                mp_irq.srcbus = MP_BUS_ISA;
                mp_irq.srcbusirq = pentry->irq; /* IRQ */
                mp_irq.dstapic = MP_APIC_ALL;
                mp_irq.dstirq = pentry->irq;
                mp_save_irq(&mp_irq);
        }
        return 0;
}

static unsigned long __init mrst_calibrate_tsc(void)
{
        unsigned long flags, fast_calibrate;

        local_irq_save(flags);
        fast_calibrate = apbt_quick_calibrate();
        local_irq_restore(flags);

        if (fast_calibrate)
                return fast_calibrate;

        return 0;
}

static void __init mrst_time_init(void)
{
        sfi_table_parse(SFI_SIG_MTMR, NULL, NULL, sfi_parse_mtmr);
        switch (mrst_timer_options) {
        case MRST_TIMER_APBT_ONLY:
                break;
        case MRST_TIMER_LAPIC_APBT:
                x86_init.timers.setup_percpu_clockev = setup_boot_APIC_clock;
                x86_cpuinit.setup_percpu_clockev = setup_secondary_APIC_clock;
                break;
        default:
                if (!boot_cpu_has(X86_FEATURE_ARAT))
                        break;
                x86_init.timers.setup_percpu_clockev = setup_boot_APIC_clock;
                x86_cpuinit.setup_percpu_clockev = setup_secondary_APIC_clock;
                return;
        }
        /* we need at least one APB timer */
        pre_init_apic_IRQ0();
        apbt_time_init();
}

static void __cpuinit mrst_arch_setup(void)
{
        if (boot_cpu_data.x86 == 6 && boot_cpu_data.x86_model == 0x27)
                __mrst_cpu_chip = MRST_CPU_CHIP_PENWELL;
        else if (boot_cpu_data.x86 == 6 && boot_cpu_data.x86_model == 0x26)
                __mrst_cpu_chip = MRST_CPU_CHIP_LINCROFT;
        else {
                pr_err("Unknown Moorestown CPU (%d:%d), default to Lincroft\n",
                        boot_cpu_data.x86, boot_cpu_data.x86_model);
                __mrst_cpu_chip = MRST_CPU_CHIP_LINCROFT;
        }
        pr_debug("Moorestown CPU %s identified\n",
                (__mrst_cpu_chip == MRST_CPU_CHIP_LINCROFT) ?
                "Lincroft" : "Penwell");
}

/* MID systems don't have i8042 controller */
static int mrst_i8042_detect(void)
{
        return 0;
}

/* Reboot and power off are handled by the SCU on a MID device */
static void mrst_power_off(void)
{
        intel_scu_ipc_simple_command(0xf1, 1);
}

static void mrst_reboot(void)
{
        intel_scu_ipc_simple_command(0xf1, 0);
}

/*
 * Moorestown specific x86_init function overrides and early setup
 * calls.
 */
void __init x86_mrst_early_setup(void)
{
        x86_init.resources.probe_roms = x86_init_noop;
        x86_init.resources.reserve_resources = x86_init_noop;

        x86_init.timers.timer_init = mrst_time_init;
        x86_init.timers.setup_percpu_clockev = x86_init_noop;

        x86_init.irqs.pre_vector_init = x86_init_noop;

        x86_init.oem.arch_setup = mrst_arch_setup;

        x86_cpuinit.setup_percpu_clockev = apbt_setup_secondary_clock;

        x86_platform.calibrate_tsc = mrst_calibrate_tsc;
        x86_platform.i8042_detect = mrst_i8042_detect;
        x86_init.timers.wallclock_init = mrst_rtc_init;
        x86_init.pci.init = pci_mrst_init;
        x86_init.pci.fixup_irqs = x86_init_noop;

        legacy_pic = &null_legacy_pic;

        /* Moorestown specific power_off/restart method */
        pm_power_off = mrst_power_off;
        machine_ops.emergency_restart  = mrst_reboot;

        /* Avoid searching for BIOS MP tables */
        x86_init.mpparse.find_smp_config = x86_init_noop;
        x86_init.mpparse.get_smp_config = x86_init_uint_noop;
        set_bit(MP_BUS_ISA, mp_bus_not_pci);
}

/*
 * if user does not want to use per CPU apb timer, just give it a lower rating
 * than local apic timer and skip the late per cpu timer init.
 */
static inline int __init setup_x86_mrst_timer(char *arg)
{
        if (!arg)
                return -EINVAL;

        if (strcmp("apbt_only", arg) == 0)
                mrst_timer_options = MRST_TIMER_APBT_ONLY;
        else if (strcmp("lapic_and_apbt", arg) == 0)
                mrst_timer_options = MRST_TIMER_LAPIC_APBT;
        else {
                pr_warning("X86 MRST timer option %s not recognised"
                           " use x86_mrst_timer=apbt_only or lapic_and_apbt\n",
                           arg);
                return -EINVAL;
        }
        return 0;
}
__setup("x86_mrst_timer=", setup_x86_mrst_timer);

/*
 * Parsing GPIO table first, since the DEVS table will need this table
 * to map the pin name to the actual pin.
 */
static struct sfi_gpio_table_entry *gpio_table;
static int gpio_num_entry;

static int __init sfi_parse_gpio(struct sfi_table_header *table)
{
        struct sfi_table_simple *sb;
        struct sfi_gpio_table_entry *pentry;
        int num, i;

        if (gpio_table)
                return 0;
        sb = (struct sfi_table_simple *)table;
        num = SFI_GET_NUM_ENTRIES(sb, struct sfi_gpio_table_entry);
        pentry = (struct sfi_gpio_table_entry *)sb->pentry;

        gpio_table = (struct sfi_gpio_table_entry *)
                                kmalloc(num * sizeof(*pentry), GFP_KERNEL);
        if (!gpio_table)
                return -1;
        memcpy(gpio_table, pentry, num * sizeof(*pentry));
        gpio_num_entry = num;

        pr_debug("GPIO pin info:\n");
        for (i = 0; i < num; i++, pentry++)
                pr_debug("info[%2d]: controller = %16.16s, pin_name = %16.16s,"
                " pin = %d\n", i,
                        pentry->controller_name,
                        pentry->pin_name,
                        pentry->pin_no);
        return 0;
}

static int get_gpio_by_name(const char *name)
{
        struct sfi_gpio_table_entry *pentry = gpio_table;
        int i;

        if (!pentry)
                return -1;
        for (i = 0; i < gpio_num_entry; i++, pentry++) {
                if (!strncmp(name, pentry->pin_name, SFI_NAME_LEN))
                        return pentry->pin_no;
        }
        return -1;
}

/*
 * Here defines the array of devices platform data that IAFW would export
 * through SFI "DEVS" table, we use name and type to match the device and
 * its platform data.
 */
struct devs_id {
        char name[SFI_NAME_LEN + 1];
        u8 type;
        u8 delay;
        void *(*get_platform_data)(void *info);
};

/* the offset for the mapping of global gpio pin to irq */
#define MRST_IRQ_OFFSET 0x100

static void __init *pmic_gpio_platform_data(void *info)
{
        static struct intel_pmic_gpio_platform_data pmic_gpio_pdata;
        int gpio_base = get_gpio_by_name("pmic_gpio_base");

        if (gpio_base == -1)
                gpio_base = 64;
        pmic_gpio_pdata.gpio_base = gpio_base;
        pmic_gpio_pdata.irq_base = gpio_base + MRST_IRQ_OFFSET;
        pmic_gpio_pdata.gpiointr = 0xffffeff8;

        return &pmic_gpio_pdata;
}

static void __init *max3111_platform_data(void *info)
{
        struct spi_board_info *spi_info = info;
        int intr = get_gpio_by_name("max3111_int");

        spi_info->mode = SPI_MODE_0;
        if (intr == -1)
                return NULL;
        spi_info->irq = intr + MRST_IRQ_OFFSET;
        return NULL;
}

/* we have multiple max7315 on the board ... */
#define MAX7315_NUM 2
static void __init *max7315_platform_data(void *info)
{
        static struct pca953x_platform_data max7315_pdata[MAX7315_NUM];
        static int nr;
        struct pca953x_platform_data *max7315 = &max7315_pdata[nr];
        struct i2c_board_info *i2c_info = info;
        int gpio_base, intr;
        char base_pin_name[SFI_NAME_LEN + 1];
        char intr_pin_name[SFI_NAME_LEN + 1];

        if (nr == MAX7315_NUM) {
                pr_err("too many max7315s, we only support %d\n",
                                MAX7315_NUM);
                return NULL;
        }
        /* we have several max7315 on the board, we only need load several
         * instances of the same pca953x driver to cover them
         */
        strcpy(i2c_info->type, "max7315");
        if (nr++) {
                sprintf(base_pin_name, "max7315_%d_base", nr);
                sprintf(intr_pin_name, "max7315_%d_int", nr);
        } else {
                strcpy(base_pin_name, "max7315_base");
                strcpy(intr_pin_name, "max7315_int");
        }

        gpio_base = get_gpio_by_name(base_pin_name);
        intr = get_gpio_by_name(intr_pin_name);

        if (gpio_base == -1)
                return NULL;
        max7315->gpio_base = gpio_base;
        if (intr != -1) {
                i2c_info->irq = intr + MRST_IRQ_OFFSET;
                max7315->irq_base = gpio_base + MRST_IRQ_OFFSET;
        } else {
                i2c_info->irq = -1;
                max7315->irq_base = -1;
        }
        return max7315;
}

static void __init *emc1403_platform_data(void *info)
{
        static short intr2nd_pdata;
        struct i2c_board_info *i2c_info = info;
        int intr = get_gpio_by_name("thermal_int");
        int intr2nd = get_gpio_by_name("thermal_alert");

        if (intr == -1 || intr2nd == -1)
                return NULL;

        i2c_info->irq = intr + MRST_IRQ_OFFSET;
        intr2nd_pdata = intr2nd + MRST_IRQ_OFFSET;

        return &intr2nd_pdata;
}

static void __init *lis331dl_platform_data(void *info)
{
        static short intr2nd_pdata;
        struct i2c_board_info *i2c_info = info;
        int intr = get_gpio_by_name("accel_int");
        int intr2nd = get_gpio_by_name("accel_2");

        if (intr == -1 || intr2nd == -1)
                return NULL;

        i2c_info->irq = intr + MRST_IRQ_OFFSET;
        intr2nd_pdata = intr2nd + MRST_IRQ_OFFSET;

        return &intr2nd_pdata;
}

static void __init *no_platform_data(void *info)
{
        return NULL;
}

static const struct devs_id __initconst device_ids[] = {
        {"pmic_gpio", SFI_DEV_TYPE_SPI, 1, &pmic_gpio_platform_data},
        {"spi_max3111", SFI_DEV_TYPE_SPI, 0, &max3111_platform_data},
        {"i2c_max7315", SFI_DEV_TYPE_I2C, 1, &max7315_platform_data},
        {"i2c_max7315_2", SFI_DEV_TYPE_I2C, 1, &max7315_platform_data},
        {"emc1403", SFI_DEV_TYPE_I2C, 1, &emc1403_platform_data},
        {"i2c_accel", SFI_DEV_TYPE_I2C, 0, &lis331dl_platform_data},
        {"pmic_audio", SFI_DEV_TYPE_IPC, 1, &no_platform_data},
        {"msic_audio", SFI_DEV_TYPE_IPC, 1, &no_platform_data},
        {},
};

#define MAX_IPCDEVS     24
static struct platform_device *ipc_devs[MAX_IPCDEVS];
static int ipc_next_dev;

#define MAX_SCU_SPI     24
static struct spi_board_info *spi_devs[MAX_SCU_SPI];
static int spi_next_dev;

#define MAX_SCU_I2C     24
static struct i2c_board_info *i2c_devs[MAX_SCU_I2C];
static int i2c_bus[MAX_SCU_I2C];
static int i2c_next_dev;

static void __init intel_scu_device_register(struct platform_device *pdev)
{
        if(ipc_next_dev == MAX_IPCDEVS)
                pr_err("too many SCU IPC devices");
        else
                ipc_devs[ipc_next_dev++] = pdev;
}

static void __init intel_scu_spi_device_register(struct spi_board_info *sdev)
{
        struct spi_board_info *new_dev;

        if (spi_next_dev == MAX_SCU_SPI) {
                pr_err("too many SCU SPI devices");
                return;
        }

        new_dev = kzalloc(sizeof(*sdev), GFP_KERNEL);
        if (!new_dev) {
                pr_err("failed to alloc mem for delayed spi dev %s\n",
                        sdev->modalias);
                return;
        }
        memcpy(new_dev, sdev, sizeof(*sdev));

        spi_devs[spi_next_dev++] = new_dev;
}

static void __init intel_scu_i2c_device_register(int bus,
                                                struct i2c_board_info *idev)
{
        struct i2c_board_info *new_dev;

        if (i2c_next_dev == MAX_SCU_I2C) {
                pr_err("too many SCU I2C devices");
                return;
        }

        new_dev = kzalloc(sizeof(*idev), GFP_KERNEL);
        if (!new_dev) {
                pr_err("failed to alloc mem for delayed i2c dev %s\n",
                        idev->type);
                return;
        }
        memcpy(new_dev, idev, sizeof(*idev));

        i2c_bus[i2c_next_dev] = bus;
        i2c_devs[i2c_next_dev++] = new_dev;
}

/* Called by IPC driver */
void intel_scu_devices_create(void)
{
        int i;

        for (i = 0; i < ipc_next_dev; i++)
                platform_device_add(ipc_devs[i]);

        for (i = 0; i < spi_next_dev; i++)
                spi_register_board_info(spi_devs[i], 1);

        for (i = 0; i < i2c_next_dev; i++) {
                struct i2c_adapter *adapter;
                struct i2c_client *client;

                adapter = i2c_get_adapter(i2c_bus[i]);
                if (adapter) {
                        client = i2c_new_device(adapter, i2c_devs[i]);
                        if (!client)
                                pr_err("can't create i2c device %s\n",
                                        i2c_devs[i]->type);
                } else
                        i2c_register_board_info(i2c_bus[i], i2c_devs[i], 1);
        }
}
EXPORT_SYMBOL_GPL(intel_scu_devices_create);

/* Called by IPC driver */
void intel_scu_devices_destroy(void)
{
        int i;

        for (i = 0; i < ipc_next_dev; i++)
                platform_device_del(ipc_devs[i]);
}
EXPORT_SYMBOL_GPL(intel_scu_devices_destroy);

static void __init install_irq_resource(struct platform_device *pdev, int irq)
{
        /* Single threaded */
        static struct resource __initdata res = {
                .name = "IRQ",
                .flags = IORESOURCE_IRQ,
        };
        res.start = irq;
        platform_device_add_resources(pdev, &res, 1);
}

static void __init sfi_handle_ipc_dev(struct platform_device *pdev)
{
        const struct devs_id *dev = device_ids;
        void *pdata = NULL;

        while (dev->name[0]) {
                if (dev->type == SFI_DEV_TYPE_IPC &&
                        !strncmp(dev->name, pdev->name, SFI_NAME_LEN)) {
                        pdata = dev->get_platform_data(pdev);
                        break;
                }
                dev++;
        }
        pdev->dev.platform_data = pdata;
        intel_scu_device_register(pdev);
}

static void __init sfi_handle_spi_dev(struct spi_board_info *spi_info)
{
        const struct devs_id *dev = device_ids;
        void *pdata = NULL;

        while (dev->name[0]) {
                if (dev->type == SFI_DEV_TYPE_SPI &&
                                !strncmp(dev->name, spi_info->modalias, SFI_NAME_LEN)) {
                        pdata = dev->get_platform_data(spi_info);
                        break;
                }
                dev++;
        }
        spi_info->platform_data = pdata;
        if (dev->delay)
                intel_scu_spi_device_register(spi_info);
        else
                spi_register_board_info(spi_info, 1);
}

static void __init sfi_handle_i2c_dev(int bus, struct i2c_board_info *i2c_info)
{
        const struct devs_id *dev = device_ids;
        void *pdata = NULL;

        while (dev->name[0]) {
                if (dev->type == SFI_DEV_TYPE_I2C &&
                        !strncmp(dev->name, i2c_info->type, SFI_NAME_LEN)) {
                        pdata = dev->get_platform_data(i2c_info);
                        break;
                }
                dev++;
        }
        i2c_info->platform_data = pdata;

        if (dev->delay)
                intel_scu_i2c_device_register(bus, i2c_info);
        else
                i2c_register_board_info(bus, i2c_info, 1);
 }


static int __init sfi_parse_devs(struct sfi_table_header *table)
{
        struct sfi_table_simple *sb;
        struct sfi_device_table_entry *pentry;
        struct spi_board_info spi_info;
        struct i2c_board_info i2c_info;
        struct platform_device *pdev;
        int num, i, bus;
        int ioapic;
        struct io_apic_irq_attr irq_attr;

        sb = (struct sfi_table_simple *)table;
        num = SFI_GET_NUM_ENTRIES(sb, struct sfi_device_table_entry);
        pentry = (struct sfi_device_table_entry *)sb->pentry;

        for (i = 0; i < num; i++, pentry++) {
                if (pentry->irq != (u8)0xff) { /* native RTE case */
                        /* these SPI2 devices are not exposed to system as PCI
                         * devices, but they have separate RTE entry in IOAPIC
                         * so we have to enable them one by one here
                         */
                        ioapic = mp_find_ioapic(pentry->irq);
                        irq_attr.ioapic = ioapic;
                        irq_attr.ioapic_pin = pentry->irq;
                        irq_attr.trigger = 1;
                        irq_attr.polarity = 1;
                        io_apic_set_pci_routing(NULL, pentry->irq, &irq_attr);
                } else
                        pentry->irq = 0; /* No irq */

                switch (pentry->type) {
                case SFI_DEV_TYPE_IPC:
                        /* ID as IRQ is a hack that will go away */
                        pdev = platform_device_alloc(pentry->name, pentry->irq);
                        if (pdev == NULL) {
                                pr_err("out of memory for SFI platform device '%s'.\n",
                                                        pentry->name);
                                continue;
                        }
                        install_irq_resource(pdev, pentry->irq);
                        pr_debug("info[%2d]: IPC bus, name = %16.16s, "
                                "irq = 0x%2x\n", i, pentry->name, pentry->irq);
                        sfi_handle_ipc_dev(pdev);
                        break;
                case SFI_DEV_TYPE_SPI:
                        memset(&spi_info, 0, sizeof(spi_info));
                        strncpy(spi_info.modalias, pentry->name, SFI_NAME_LEN);
                        spi_info.irq = pentry->irq;
                        spi_info.bus_num = pentry->host_num;
                        spi_info.chip_select = pentry->addr;
                        spi_info.max_speed_hz = pentry->max_freq;
                        pr_debug("info[%2d]: SPI bus = %d, name = %16.16s, "
                                "irq = 0x%2x, max_freq = %d, cs = %d\n", i,
                                spi_info.bus_num,
                                spi_info.modalias,
                                spi_info.irq,
                                spi_info.max_speed_hz,
                                spi_info.chip_select);
                        sfi_handle_spi_dev(&spi_info);
                        break;
                case SFI_DEV_TYPE_I2C:
                        memset(&i2c_info, 0, sizeof(i2c_info));
                        bus = pentry->host_num;
                        strncpy(i2c_info.type, pentry->name, SFI_NAME_LEN);
                        i2c_info.irq = pentry->irq;
                        i2c_info.addr = pentry->addr;
                        pr_debug("info[%2d]: I2C bus = %d, name = %16.16s, "
                                "irq = 0x%2x, addr = 0x%x\n", i, bus,
                                i2c_info.type,
                                i2c_info.irq,
                                i2c_info.addr);
                        sfi_handle_i2c_dev(bus, &i2c_info);
                        break;
                case SFI_DEV_TYPE_UART:
                case SFI_DEV_TYPE_HSI:
                default:
                        ;
                }
        }
        return 0;
}

static int __init mrst_platform_init(void)
{
        sfi_table_parse(SFI_SIG_GPIO, NULL, NULL, sfi_parse_gpio);
        sfi_table_parse(SFI_SIG_DEVS, NULL, NULL, sfi_parse_devs);
        return 0;
}
arch_initcall(mrst_platform_init);

/*
 * we will search these buttons in SFI GPIO table (by name)
 * and register them dynamically. Please add all possible
 * buttons here, we will shrink them if no GPIO found.
 */
static struct gpio_keys_button gpio_button[] = {
        {KEY_POWER,             -1, 1, "power_btn",     EV_KEY, 0, 3000},
        {KEY_PROG1,             -1, 1, "prog_btn1",     EV_KEY, 0, 20},
        {KEY_PROG2,             -1, 1, "prog_btn2",     EV_KEY, 0, 20},
        {SW_LID,                -1, 1, "lid_switch",    EV_SW,  0, 20},
        {KEY_VOLUMEUP,          -1, 1, "vol_up",        EV_KEY, 0, 20},
        {KEY_VOLUMEDOWN,        -1, 1, "vol_down",      EV_KEY, 0, 20},
        {KEY_CAMERA,            -1, 1, "camera_full",   EV_KEY, 0, 20},
        {KEY_CAMERA_FOCUS,      -1, 1, "camera_half",   EV_KEY, 0, 20},
        {SW_KEYPAD_SLIDE,       -1, 1, "MagSw1",        EV_SW,  0, 20},
        {SW_KEYPAD_SLIDE,       -1, 1, "MagSw2",        EV_SW,  0, 20},
};

static struct gpio_keys_platform_data mrst_gpio_keys = {
        .buttons        = gpio_button,
        .rep            = 1,
        .nbuttons       = -1, /* will fill it after search */
};

static struct platform_device pb_device = {
        .name           = "gpio-keys",
        .id             = -1,
        .dev            = {
                .platform_data  = &mrst_gpio_keys,
        },
};

/*
 * Shrink the non-existent buttons, register the gpio button
 * device if there is some
 */
static int __init pb_keys_init(void)
{
        struct gpio_keys_button *gb = gpio_button;
        int i, num, good = 0;

        num = sizeof(gpio_button) / sizeof(struct gpio_keys_button);
        for (i = 0; i < num; i++) {
                gb[i].gpio = get_gpio_by_name(gb[i].desc);
                if (gb[i].gpio == -1)
                        continue;

                if (i != good)
                        gb[good] = gb[i];
                good++;
        }

        if (good) {
                mrst_gpio_keys.nbuttons = good;
                return platform_device_register(&pb_device);
        }
        return 0;
}
late_initcall(pb_keys_init);