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++) {
		int irq = pentry->irq;

		if (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(irq);
			irq_attr.ioapic = ioapic;
			irq_attr.ioapic_pin = irq;
			irq_attr.trigger = 1;
			irq_attr.polarity = 1;
			io_apic_set_pci_routing(NULL, irq, &irq_attr);
		} else
			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, irq);
			if (pdev == NULL) {
				pr_err("out of memory for SFI platform device '%s'.\n",
							pentry->name);
				continue;
			}
			install_irq_resource(pdev, irq);
			pr_debug("info[%2d]: IPC bus, name = %16.16s, "
				"irq = 0x%2x\n", i, pentry->name, 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 = 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 = 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);