drivers/platform/x86/silicom-platform.c

// SPDX-License-Identifier: GPL-2.0+
//
// silicom-platform.c - Silicom MEC170x platform driver
//
// Copyright (C) 2023 Henry Shi <henrys@silicom-usa.com>
#include <linux/bitfield.h>
#include <linux/bits.h>
#include <linux/dmi.h>
#include <linux/hwmon.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/kobject.h>
#include <linux/led-class-multicolor.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/string.h>
#include <linux/sysfs.h>
#include <linux/units.h>

#include <linux/gpio/driver.h>

#define MEC_POWER_CYCLE_ADDR 0x24
#define MEC_EFUSE_LSB_ADDR   0x28
#define MEC_GPIO_IN_POS      0x08
#define MEC_IO_BASE          0x0800
#define MEC_IO_LEN           0x8
#define IO_REG_BANK          0x0
#define DEFAULT_CHAN_LO      0
#define DEFAULT_CHAN_HI      0
#define DEFAULT_CHAN_LO_T    0xc
#define MEC_ADDR             (MEC_IO_BASE + 0x02)
#define EC_ADDR_LSB          MEC_ADDR
#define SILICOM_MEC_MAGIC    0x5a

#define MEC_PORT_CHANNEL_MASK GENMASK(2, 0)
#define MEC_PORT_DWORD_OFFSET GENMASK(31, 3)
#define MEC_DATA_OFFSET_MASK  GENMASK(1, 0)
#define MEC_PORT_OFFSET_MASK  GENMASK(7, 2)

#define MEC_TEMP_LOC          GENMASK(31, 16)
#define MEC_VERSION_LOC       GENMASK(15, 8)
#define MEC_VERSION_MAJOR     GENMASK(15, 14)
#define MEC_VERSION_MINOR     GENMASK(13, 8)

#define EC_ADDR_MSB           (MEC_IO_BASE + 0x3)
#define MEC_DATA_OFFSET(offset) (MEC_IO_BASE + 0x04 + (offset))

#define OFFSET_BIT_TO_CHANNEL(off, bit) ((((off) + 0x014) << 3) | (bit))
#define CHANNEL_TO_OFFSET(chan) (((chan) >> 3) - 0x14)

static DEFINE_MUTEX(mec_io_mutex);
static unsigned int efuse_status;
static unsigned int mec_uc_version;
static unsigned int power_cycle;

static const struct hwmon_channel_info *silicom_fan_control_info[] = {
	HWMON_CHANNEL_INFO(fan, HWMON_F_INPUT | HWMON_F_LABEL),
	HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_LABEL),
	NULL
};

struct silicom_platform_info {
	int io_base;
	int io_len;
	struct led_classdev_mc *led_info;
	struct gpio_chip *gpiochip;
	u8 *gpio_channels;
	u16 ngpio;
};

static const char * const plat_0222_gpio_names[] = {
	"AUTOM0_SFP_TX_FAULT",
	"SLOT2_LED_OUT",
	"SIM_M2_SLOT2_B_DET",
	"SIM_M2_SLOT2_A_DET",
	"SLOT1_LED_OUT",
	"SIM_M2_SLOT1_B_DET",
	"SIM_M2_SLOT1_A_DET",
	"SLOT0_LED_OUT",
	"WAN_SFP0_RX_LOS",
	"WAN_SFP0_PRSNT_N",
	"WAN_SFP0_TX_FAULT",
	"AUTOM1_SFP_RX_LOS",
	"AUTOM1_SFP_PRSNT_N",
	"AUTOM1_SFP_TX_FAULT",
	"AUTOM0_SFP_RX_LOS",
	"AUTOM0_SFP_PRSNT_N",
	"WAN_SFP1_RX_LOS",
	"WAN_SFP1_PRSNT_N",
	"WAN_SFP1_TX_FAULT",
	"SIM_M2_SLOT1_MUX_SEL",
	"W_DISABLE_M2_SLOT1_N",
	"W_DISABLE_MPCIE_SLOT0_N",
	"W_DISABLE_M2_SLOT0_N",
	"BT_COMMAND_MODE",
	"WAN_SFP1_TX_DISABLE",
	"WAN_SFP0_TX_DISABLE",
	"AUTOM1_SFP_TX_DISABLE",
	"AUTOM0_SFP_TX_DISABLE",
	"SIM_M2_SLOT2_MUX_SEL",
	"W_DISABLE_M2_SLOT2_N",
	"RST_CTL_M2_SLOT_1_N",
	"RST_CTL_M2_SLOT_2_N",
	"PM_USB_PWR_EN_BOT",
	"PM_USB_PWR_EN_TOP",
};

static u8 plat_0222_gpio_channels[] = {
	OFFSET_BIT_TO_CHANNEL(0x00, 0),
	OFFSET_BIT_TO_CHANNEL(0x00, 1),
	OFFSET_BIT_TO_CHANNEL(0x00, 2),
	OFFSET_BIT_TO_CHANNEL(0x00, 3),
	OFFSET_BIT_TO_CHANNEL(0x00, 4),
	OFFSET_BIT_TO_CHANNEL(0x00, 5),
	OFFSET_BIT_TO_CHANNEL(0x00, 6),
	OFFSET_BIT_TO_CHANNEL(0x00, 7),
	OFFSET_BIT_TO_CHANNEL(0x01, 0),
	OFFSET_BIT_TO_CHANNEL(0x01, 1),
	OFFSET_BIT_TO_CHANNEL(0x01, 2),
	OFFSET_BIT_TO_CHANNEL(0x01, 3),
	OFFSET_BIT_TO_CHANNEL(0x01, 4),
	OFFSET_BIT_TO_CHANNEL(0x01, 5),
	OFFSET_BIT_TO_CHANNEL(0x01, 6),
	OFFSET_BIT_TO_CHANNEL(0x01, 7),
	OFFSET_BIT_TO_CHANNEL(0x02, 0),
	OFFSET_BIT_TO_CHANNEL(0x02, 1),
	OFFSET_BIT_TO_CHANNEL(0x02, 2),
	OFFSET_BIT_TO_CHANNEL(0x09, 0),
	OFFSET_BIT_TO_CHANNEL(0x09, 1),
	OFFSET_BIT_TO_CHANNEL(0x09, 2),
	OFFSET_BIT_TO_CHANNEL(0x09, 3),
	OFFSET_BIT_TO_CHANNEL(0x0a, 0),
	OFFSET_BIT_TO_CHANNEL(0x0a, 1),
	OFFSET_BIT_TO_CHANNEL(0x0a, 2),
	OFFSET_BIT_TO_CHANNEL(0x0a, 3),
	OFFSET_BIT_TO_CHANNEL(0x0a, 4),
	OFFSET_BIT_TO_CHANNEL(0x0a, 5),
	OFFSET_BIT_TO_CHANNEL(0x0a, 6),
	OFFSET_BIT_TO_CHANNEL(0x0b, 0),
	OFFSET_BIT_TO_CHANNEL(0x0b, 1),
	OFFSET_BIT_TO_CHANNEL(0x0b, 2),
	OFFSET_BIT_TO_CHANNEL(0x0b, 3),
};

static struct platform_device *silicom_platform_dev;
static struct led_classdev_mc *silicom_led_info __initdata;
static struct gpio_chip *silicom_gpiochip __initdata;
static u8 *silicom_gpio_channels __initdata;

static int silicom_mec_port_get(unsigned int offset)
{
	unsigned short mec_data_addr;
	unsigned short mec_port_addr;
	u8 reg;

	mec_data_addr = FIELD_GET(MEC_PORT_DWORD_OFFSET, offset) & MEC_DATA_OFFSET_MASK;
	mec_port_addr = FIELD_GET(MEC_PORT_DWORD_OFFSET, offset) & MEC_PORT_OFFSET_MASK;

	mutex_lock(&mec_io_mutex);
	outb(mec_port_addr, MEC_ADDR);
	reg = inb(MEC_DATA_OFFSET(mec_data_addr));
	mutex_unlock(&mec_io_mutex);

	return (reg >> (offset & MEC_PORT_CHANNEL_MASK)) & 0x01;
}

static enum led_brightness silicom_mec_led_get(int channel)
{
	/* Outputs are active low */
	return silicom_mec_port_get(channel) ? LED_OFF : LED_ON;
}

static void silicom_mec_port_set(int channel, int on)
{

	unsigned short mec_data_addr;
	unsigned short mec_port_addr;
	u8 reg;

	mec_data_addr = FIELD_GET(MEC_PORT_DWORD_OFFSET, channel) & MEC_DATA_OFFSET_MASK;
	mec_port_addr = FIELD_GET(MEC_PORT_DWORD_OFFSET, channel) & MEC_PORT_OFFSET_MASK;

	mutex_lock(&mec_io_mutex);
	outb(mec_port_addr, MEC_ADDR);
	reg = inb(MEC_DATA_OFFSET(mec_data_addr));
	/* Outputs are active low, so clear the bit for on, or set it for off */
	if (on)
		reg &= ~(1 << (channel & MEC_PORT_CHANNEL_MASK));
	else
		reg |= 1 << (channel & MEC_PORT_CHANNEL_MASK);
	outb(reg, MEC_DATA_OFFSET(mec_data_addr));
	mutex_unlock(&mec_io_mutex);
}

static enum led_brightness silicom_mec_led_mc_brightness_get(struct led_classdev *led_cdev)
{
	struct led_classdev_mc *mc_cdev = lcdev_to_mccdev(led_cdev);
	enum led_brightness brightness = LED_OFF;
	int i;

	for (i = 0; i < mc_cdev->num_colors; i++) {
		mc_cdev->subled_info[i].brightness =
			silicom_mec_led_get(mc_cdev->subled_info[i].channel);
		/* Mark the overall brightness as LED_ON if any of the subleds are on */
		if (mc_cdev->subled_info[i].brightness != LED_OFF)
			brightness = LED_ON;
	}

	return brightness;
}

static void silicom_mec_led_mc_brightness_set(struct led_classdev *led_cdev,
					      enum led_brightness brightness)
{
	struct led_classdev_mc *mc_cdev = lcdev_to_mccdev(led_cdev);
	int i;

	led_mc_calc_color_components(mc_cdev, brightness);
	for (i = 0; i < mc_cdev->num_colors; i++) {
		silicom_mec_port_set(mc_cdev->subled_info[i].channel,
				     mc_cdev->subled_info[i].brightness);
	}
}

static int silicom_gpio_get_direction(struct gpio_chip *gc,
				      unsigned int offset)
{
	u8 *channels = gpiochip_get_data(gc);

	/* Input registers have offsets between [0x00, 0x07] */
	if (CHANNEL_TO_OFFSET(channels[offset]) < MEC_GPIO_IN_POS)
		return GPIO_LINE_DIRECTION_IN;

	return GPIO_LINE_DIRECTION_OUT;
}

static int silicom_gpio_direction_input(struct gpio_chip *gc,
					unsigned int offset)
{
	int direction = silicom_gpio_get_direction(gc, offset);

	return direction == GPIO_LINE_DIRECTION_IN ? 0 : -EINVAL;
}

static void silicom_gpio_set(struct gpio_chip *gc,
			     unsigned int offset,
			     int value)
{
	int direction = silicom_gpio_get_direction(gc, offset);
	u8 *channels = gpiochip_get_data(gc);
	int channel = channels[offset];

	if (direction == GPIO_LINE_DIRECTION_IN)
		return;

	if (value)
		silicom_mec_port_set(channel, 0);
	else if (value == 0)
		silicom_mec_port_set(channel, 1);
	else
		pr_err("Wrong argument value: %d\n", value);
}

static int silicom_gpio_direction_output(struct gpio_chip *gc,
					 unsigned int offset,
					 int value)
{
	int direction = silicom_gpio_get_direction(gc, offset);

	if (direction == GPIO_LINE_DIRECTION_IN)
		return -EINVAL;

	silicom_gpio_set(gc, offset, value);

	return 0;
}

static int silicom_gpio_get(struct gpio_chip *gc, unsigned int offset)
{
	u8 *channels = gpiochip_get_data(gc);
	int channel = channels[offset];

	return silicom_mec_port_get(channel);
}

static struct mc_subled plat_0222_wan_mc_subled_info[] __initdata = {
	{
		.color_index = LED_COLOR_ID_WHITE,
		.brightness = 1,
		.intensity = 0,
		.channel = OFFSET_BIT_TO_CHANNEL(0x0c, 7),
	},
	{
		.color_index = LED_COLOR_ID_YELLOW,
		.brightness = 1,
		.intensity = 0,
		.channel = OFFSET_BIT_TO_CHANNEL(0x0c, 6),
	},
	{
		.color_index = LED_COLOR_ID_RED,
		.brightness = 1,
		.intensity = 0,
		.channel = OFFSET_BIT_TO_CHANNEL(0x0c, 5),
	},
};

static struct mc_subled plat_0222_sys_mc_subled_info[] __initdata = {
	{
		.color_index = LED_COLOR_ID_WHITE,
		.brightness = 1,
		.intensity = 0,
		.channel = OFFSET_BIT_TO_CHANNEL(0x0c, 4),
	},
	{
		.color_index = LED_COLOR_ID_AMBER,
		.brightness = 1,
		.intensity = 0,
		.channel = OFFSET_BIT_TO_CHANNEL(0x0c, 3),
	},
	{
		.color_index = LED_COLOR_ID_RED,
		.brightness = 1,
		.intensity = 0,
		.channel = OFFSET_BIT_TO_CHANNEL(0x0c, 2),
	},
};

static struct mc_subled plat_0222_stat1_mc_subled_info[] __initdata = {
	{
		.color_index = LED_COLOR_ID_RED,
		.brightness = 1,
		.intensity = 0,
		.channel = OFFSET_BIT_TO_CHANNEL(0x0c, 1),
	},
	{
		.color_index = LED_COLOR_ID_GREEN,
		.brightness = 1,
		.intensity = 0,
		.channel = OFFSET_BIT_TO_CHANNEL(0x0c, 0),
	},
	{
		.color_index = LED_COLOR_ID_BLUE,
		.brightness = 1,
		.intensity = 0,
		.channel = OFFSET_BIT_TO_CHANNEL(0x0d, 7),
	},
	{
		.color_index = LED_COLOR_ID_YELLOW,
		.brightness = 1,
		.intensity = 0,
		.channel = OFFSET_BIT_TO_CHANNEL(0x0d, 6),
	},
};

static struct mc_subled plat_0222_stat2_mc_subled_info[] __initdata = {
	{
		.color_index = LED_COLOR_ID_RED,
		.brightness = 1,
		.intensity = 0,
		.channel = OFFSET_BIT_TO_CHANNEL(0x0d, 5),
	},
	{
		.color_index = LED_COLOR_ID_GREEN,
		.brightness = 1,
		.intensity = 0,
		.channel = OFFSET_BIT_TO_CHANNEL(0x0d, 4),
	},
	{
		.color_index = LED_COLOR_ID_BLUE,
		.brightness = 1,
		.intensity = 0,
		.channel = OFFSET_BIT_TO_CHANNEL(0x0d, 3),
	},
	{
		.color_index = LED_COLOR_ID_YELLOW,
		.brightness = 1,
		.intensity = 0,
		.channel = OFFSET_BIT_TO_CHANNEL(0x0d, 2),
	},
};

static struct mc_subled plat_0222_stat3_mc_subled_info[] __initdata = {
	{
		.color_index = LED_COLOR_ID_RED,
		.brightness = 1,
		.intensity = 0,
		.channel = OFFSET_BIT_TO_CHANNEL(0x0d, 1),
	},
	{
		.color_index = LED_COLOR_ID_GREEN,
		.brightness = 1,
		.intensity = 0,
		.channel = OFFSET_BIT_TO_CHANNEL(0x0d, 0),
	},
	{
		.color_index = LED_COLOR_ID_BLUE,
		.brightness = 1,
		.intensity = 0,
		.channel = OFFSET_BIT_TO_CHANNEL(0x0e, 1),
	},
	{
		.color_index = LED_COLOR_ID_YELLOW,
		.brightness = 1,
		.intensity = 0,
		.channel = OFFSET_BIT_TO_CHANNEL(0x0e, 0),
	},
};

static struct led_classdev_mc plat_0222_mc_led_info[] __initdata = {
	{
		.led_cdev = {
			.name = "platled::wan",
			.brightness = 0,
			.max_brightness = 1,
			.brightness_set = silicom_mec_led_mc_brightness_set,
			.brightness_get = silicom_mec_led_mc_brightness_get,
		},
		.num_colors = ARRAY_SIZE(plat_0222_wan_mc_subled_info),
		.subled_info = plat_0222_wan_mc_subled_info,
	},
	{
		.led_cdev = {
			.name = "platled::sys",
			.brightness = 0,
			.max_brightness = 1,
			.brightness_set = silicom_mec_led_mc_brightness_set,
			.brightness_get = silicom_mec_led_mc_brightness_get,
		},
		.num_colors = ARRAY_SIZE(plat_0222_sys_mc_subled_info),
		.subled_info = plat_0222_sys_mc_subled_info,
	},
	{
		.led_cdev = {
			.name = "platled::stat1",
			.brightness = 0,
			.max_brightness = 1,
			.brightness_set = silicom_mec_led_mc_brightness_set,
			.brightness_get = silicom_mec_led_mc_brightness_get,
		},
		.num_colors = ARRAY_SIZE(plat_0222_stat1_mc_subled_info),
		.subled_info = plat_0222_stat1_mc_subled_info,
	},
	{
		.led_cdev = {
			.name = "platled::stat2",
			.brightness = 0,
			.max_brightness = 1,
			.brightness_set = silicom_mec_led_mc_brightness_set,
			.brightness_get = silicom_mec_led_mc_brightness_get,
		},
		.num_colors = ARRAY_SIZE(plat_0222_stat2_mc_subled_info),
		.subled_info = plat_0222_stat2_mc_subled_info,
	},
	{
		.led_cdev = {
			.name = "platled::stat3",
			.brightness = 0,
			.max_brightness = 1,
			.brightness_set = silicom_mec_led_mc_brightness_set,
			.brightness_get = silicom_mec_led_mc_brightness_get,
		},
		.num_colors = ARRAY_SIZE(plat_0222_stat3_mc_subled_info),
		.subled_info = plat_0222_stat3_mc_subled_info,
	},
	{ },
};

static struct gpio_chip silicom_gpio_chip = {
	.label = "silicom-gpio",
	.get_direction = silicom_gpio_get_direction,
	.direction_input = silicom_gpio_direction_input,
	.direction_output = silicom_gpio_direction_output,
	.get = silicom_gpio_get,
	.set = silicom_gpio_set,
	.base = -1,
	.ngpio = ARRAY_SIZE(plat_0222_gpio_channels),
	.names = plat_0222_gpio_names,
	/*
	 * We're using a mutex to protect the indirect access, so we can sleep
	 * if the lock blocks
	 */
	.can_sleep = true,
};

static struct silicom_platform_info silicom_plat_0222_cordoba_info __initdata = {
	.io_base = MEC_IO_BASE,
	.io_len = MEC_IO_LEN,
	.led_info = plat_0222_mc_led_info,
	.gpiochip = &silicom_gpio_chip,
	.gpio_channels = plat_0222_gpio_channels,
	/*
	 * The original generic cordoba does not have the last 4 outputs of the
	 * plat_0222 variant, the rest are the same, so use the same longer list,
	 * but ignore the last entries here
	 */
	.ngpio = ARRAY_SIZE(plat_0222_gpio_channels),

};

static struct mc_subled cordoba_fp_left_mc_subled_info[] __initdata = {
	{
		.color_index = LED_COLOR_ID_RED,
		.brightness = 1,
		.intensity = 0,
		.channel = OFFSET_BIT_TO_CHANNEL(0x08, 6),
	},
	{
		.color_index = LED_COLOR_ID_GREEN,
		.brightness = 1,
		.intensity = 0,
		.channel = OFFSET_BIT_TO_CHANNEL(0x08, 5),
	},
	{
		.color_index = LED_COLOR_ID_BLUE,
		.brightness = 1,
		.intensity = 0,
		.channel = OFFSET_BIT_TO_CHANNEL(0x09, 7),
	},
	{
		.color_index = LED_COLOR_ID_AMBER,
		.brightness = 1,
		.intensity = 0,
		.channel = OFFSET_BIT_TO_CHANNEL(0x09, 4),
	},
};

static struct mc_subled cordoba_fp_center_mc_subled_info[] __initdata = {
	{
		.color_index = LED_COLOR_ID_RED,
		.brightness = 1,
		.intensity = 0,
		.channel = OFFSET_BIT_TO_CHANNEL(0x08, 7),
	},
	{
		.color_index = LED_COLOR_ID_GREEN,
		.brightness = 1,
		.intensity = 0,
		.channel = OFFSET_BIT_TO_CHANNEL(0x08, 4),
	},
	{
		.color_index = LED_COLOR_ID_BLUE,
		.brightness = 1,
		.intensity = 0,
		.channel = OFFSET_BIT_TO_CHANNEL(0x08, 3),
	},
	{
		.color_index = LED_COLOR_ID_AMBER,
		.brightness = 1,
		.intensity = 0,
		.channel = OFFSET_BIT_TO_CHANNEL(0x09, 6),
	},
};

static struct mc_subled cordoba_fp_right_mc_subled_info[] __initdata = {
	{
		.color_index = LED_COLOR_ID_RED,
		.brightness = 1,
		.intensity = 0,
		.channel = OFFSET_BIT_TO_CHANNEL(0x08, 2),
	},
	{
		.color_index = LED_COLOR_ID_GREEN,
		.brightness = 1,
		.intensity = 0,
		.channel = OFFSET_BIT_TO_CHANNEL(0x08, 1),
	},
	{
		.color_index = LED_COLOR_ID_BLUE,
		.brightness = 1,
		.intensity = 0,
		.channel = OFFSET_BIT_TO_CHANNEL(0x08, 0),
	},
	{
		.color_index = LED_COLOR_ID_AMBER,
		.brightness = 1,
		.intensity = 0,
		.channel = OFFSET_BIT_TO_CHANNEL(0x09, 5),
	},
};

static struct led_classdev_mc cordoba_mc_led_info[] __initdata = {
	{
		.led_cdev = {
			.name = "platled::fp_left",
			.brightness = 0,
			.max_brightness = 1,
			.brightness_set = silicom_mec_led_mc_brightness_set,
			.brightness_get = silicom_mec_led_mc_brightness_get,
		},
		.num_colors = ARRAY_SIZE(cordoba_fp_left_mc_subled_info),
		.subled_info = cordoba_fp_left_mc_subled_info,
	},
	{
		.led_cdev = {
			.name = "platled::fp_center",
			.brightness = 0,
			.max_brightness = 1,
			.brightness_set = silicom_mec_led_mc_brightness_set,
			.brightness_get = silicom_mec_led_mc_brightness_get,
		},
		.num_colors = ARRAY_SIZE(cordoba_fp_center_mc_subled_info),
		.subled_info = cordoba_fp_center_mc_subled_info,
	},
	{
		.led_cdev = {
			.name = "platled::fp_right",
			.brightness = 0,
			.max_brightness = 1,
			.brightness_set = silicom_mec_led_mc_brightness_set,
			.brightness_get = silicom_mec_led_mc_brightness_get,
		},
		.num_colors = ARRAY_SIZE(cordoba_fp_right_mc_subled_info),
		.subled_info = cordoba_fp_right_mc_subled_info,
	},
	{ },
};

static struct silicom_platform_info silicom_generic_cordoba_info __initdata = {
	.io_base = MEC_IO_BASE,
	.io_len = MEC_IO_LEN,
	.led_info = cordoba_mc_led_info,
	.gpiochip = &silicom_gpio_chip,
	.gpio_channels = plat_0222_gpio_channels,
	.ngpio = ARRAY_SIZE(plat_0222_gpio_channels),
};

/*
 * sysfs interface
 */
static ssize_t efuse_status_show(struct device *dev,
				 struct device_attribute *attr,
				 char *buf)
{
	u32 reg;

	mutex_lock(&mec_io_mutex);
	/* Select memory region */
	outb(IO_REG_BANK, EC_ADDR_MSB);
	outb(MEC_EFUSE_LSB_ADDR, EC_ADDR_LSB);

	/* Get current data from the address */
	reg = inl(MEC_DATA_OFFSET(DEFAULT_CHAN_LO));
	mutex_unlock(&mec_io_mutex);

	efuse_status = reg & 0x1;

	return sysfs_emit(buf, "%u\n", efuse_status);
}
static DEVICE_ATTR_RO(efuse_status);

static ssize_t uc_version_show(struct device *dev,
			       struct device_attribute *attr,
			       char *buf)
{
	int uc_version;
	u32 reg;

	mutex_lock(&mec_io_mutex);
	outb(IO_REG_BANK, EC_ADDR_MSB);
	outb(DEFAULT_CHAN_LO, EC_ADDR_LSB);

	reg = inl(MEC_DATA_OFFSET(DEFAULT_CHAN_LO));
	mutex_unlock(&mec_io_mutex);
	uc_version = FIELD_GET(MEC_VERSION_LOC, reg);
	if (uc_version >= 192)
		return -EINVAL;

	uc_version = FIELD_GET(MEC_VERSION_MAJOR, reg) * 100 +
		     FIELD_GET(MEC_VERSION_MINOR, reg);

	mec_uc_version = uc_version;

	return sysfs_emit(buf, "%u\n", mec_uc_version);
}
static DEVICE_ATTR_RO(uc_version);

static ssize_t power_cycle_show(struct device *dev,
				struct device_attribute *attr,
				char *buf)
{
	return sysfs_emit(buf, "%u\n", power_cycle);
}

static void powercycle_uc(void)
{
	/* Select memory region */
	outb(IO_REG_BANK, EC_ADDR_MSB);
	outb(MEC_POWER_CYCLE_ADDR, EC_ADDR_LSB);

	/* Set to 1 for current data from the address */
	outb(1, MEC_DATA_OFFSET(DEFAULT_CHAN_LO));
}

static ssize_t power_cycle_store(struct device *dev,
				 struct device_attribute *attr,
				 const char *buf, size_t count)
{
	int rc;
	unsigned int power_cycle_cmd;

	rc = kstrtou32(buf, 0, &power_cycle_cmd);
	if (rc)
		return -EINVAL;

	if (power_cycle_cmd > 0) {
		mutex_lock(&mec_io_mutex);
		power_cycle = power_cycle_cmd;
		powercycle_uc();
		mutex_unlock(&mec_io_mutex);
	}

	return count;
}
static DEVICE_ATTR_RW(power_cycle);

static struct attribute *silicom_attrs[] = {
	&dev_attr_efuse_status.attr,
	&dev_attr_uc_version.attr,
	&dev_attr_power_cycle.attr,
	NULL,
};
ATTRIBUTE_GROUPS(silicom);

static struct platform_driver silicom_platform_driver = {
	.driver = {
		.name = "silicom-platform",
		.dev_groups = silicom_groups,
	},
};

static int __init silicom_mc_leds_register(struct device *dev,
					   const struct led_classdev_mc *mc_leds)
{
	int size = sizeof(struct mc_subled);
	struct led_classdev_mc *led;
	int i, err;

	for (i = 0; mc_leds[i].led_cdev.name; i++) {

		led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
		if (!led)
			return -ENOMEM;
		memcpy(led, &mc_leds[i], sizeof(*led));

		led->subled_info = devm_kzalloc(dev, led->num_colors * size, GFP_KERNEL);
		if (!led->subled_info)
			return -ENOMEM;
		memcpy(led->subled_info, mc_leds[i].subled_info, led->num_colors * size);

		err = devm_led_classdev_multicolor_register(dev, led);
		if (err)
			return err;
	}

	return 0;
}

static u32 rpm_get(void)
{
	u32 reg;

	mutex_lock(&mec_io_mutex);
	/* Select memory region */
	outb(IO_REG_BANK, EC_ADDR_MSB);
	outb(DEFAULT_CHAN_LO_T, EC_ADDR_LSB);
	reg = inw(MEC_DATA_OFFSET(DEFAULT_CHAN_LO));
	mutex_unlock(&mec_io_mutex);

	return reg;
}

static u32 temp_get(void)
{
	u32 reg;

	mutex_lock(&mec_io_mutex);
	/* Select memory region */
	outb(IO_REG_BANK, EC_ADDR_MSB);
	outb(DEFAULT_CHAN_LO_T, EC_ADDR_LSB);
	reg = inl(MEC_DATA_OFFSET(DEFAULT_CHAN_LO));
	mutex_unlock(&mec_io_mutex);

	return FIELD_GET(MEC_TEMP_LOC, reg) * 100;
}

static umode_t silicom_fan_control_fan_is_visible(const u32 attr)
{
	switch (attr) {
	case hwmon_fan_input:
	case hwmon_fan_label:
		return 0444;
	default:
		return 0;
	}
}

static umode_t silicom_fan_control_temp_is_visible(const u32 attr)
{
	switch (attr) {
	case hwmon_temp_input:
	case hwmon_temp_label:
		return 0444;
	default:
		return 0;
	}
}

static int silicom_fan_control_read_fan(struct device *dev, u32 attr, long *val)
{
	switch (attr) {
	case hwmon_fan_input:
		*val = rpm_get();
		return 0;
	default:
		return -EOPNOTSUPP;
	}
}

static int silicom_fan_control_read_temp(struct device *dev, u32 attr, long *val)
{
	switch (attr) {
	case hwmon_temp_input:
		*val = temp_get();
		return 0;
	default:
		return -EOPNOTSUPP;
	}
}

static umode_t silicom_fan_control_is_visible(const void *data,
					      enum hwmon_sensor_types type,
					      u32 attr, int channel)
{
	switch (type) {
	case hwmon_fan:
		return silicom_fan_control_fan_is_visible(attr);
	case hwmon_temp:
		return silicom_fan_control_temp_is_visible(attr);
	default:
		return 0;
	}
}

static int silicom_fan_control_read(struct device *dev,
				    enum hwmon_sensor_types type,
				    u32 attr, int channel,
				    long *val)
{
	switch (type) {
	case hwmon_fan:
		return silicom_fan_control_read_fan(dev, attr, val);
	case hwmon_temp:
		return silicom_fan_control_read_temp(dev, attr, val);
	default:
		return -EOPNOTSUPP;
	}
}

static int silicom_fan_control_read_labels(struct device *dev,
					   enum hwmon_sensor_types type,
					   u32 attr, int channel,
					   const char **str)
{
	switch (type) {
	case hwmon_fan:
		*str = "Silicom_platform: Fan Speed";
		return 0;
	case hwmon_temp:
		*str = "Silicom_platform: Thermostat Sensor";
		return 0;
	default:
		return -EOPNOTSUPP;
	}
}

static const struct hwmon_ops silicom_fan_control_hwmon_ops = {
	.is_visible = silicom_fan_control_is_visible,
	.read = silicom_fan_control_read,
	.read_string = silicom_fan_control_read_labels,
};

static const struct hwmon_chip_info silicom_chip_info = {
	.ops = &silicom_fan_control_hwmon_ops,
	.info = silicom_fan_control_info,
};

static int __init silicom_platform_probe(struct platform_device *device)
{
	struct device *hwmon_dev;
	u8 magic, ver;
	int err;

	if (!devm_request_region(&device->dev, MEC_IO_BASE, MEC_IO_LEN, "mec")) {
		dev_err(&device->dev, "couldn't reserve MEC io ports\n");
		return -EBUSY;
	}

	/* Sanity check magic number read for EC */
	outb(IO_REG_BANK, MEC_ADDR);
	magic = inb(MEC_DATA_OFFSET(DEFAULT_CHAN_LO));
	ver = inb(MEC_DATA_OFFSET(DEFAULT_CHAN_HI));
	dev_dbg(&device->dev, "EC magic 0x%02x, version 0x%02x\n", magic, ver);

	if (magic != SILICOM_MEC_MAGIC) {
		dev_err(&device->dev, "Bad EC magic 0x%02x!\n", magic);
		return -ENODEV;
	}

	err = silicom_mc_leds_register(&device->dev, silicom_led_info);
	if (err) {
		dev_err(&device->dev, "Failed to register LEDs\n");
		return err;
	}

	err = devm_gpiochip_add_data(&device->dev, silicom_gpiochip,
				     silicom_gpio_channels);
	if (err) {
		dev_err(&device->dev, "Failed to register gpiochip: %d\n", err);
		return err;
	}

	hwmon_dev = devm_hwmon_device_register_with_info(&device->dev, "silicom_fan", NULL,
							 &silicom_chip_info, NULL);
	err = PTR_ERR_OR_ZERO(hwmon_dev);
	if (err) {
		dev_err(&device->dev, "Failed to register hwmon_dev: %d\n", err);
		return err;
	}

	return err;
}

static int __init silicom_platform_info_init(const struct dmi_system_id *id)
{
	struct silicom_platform_info *info = id->driver_data;

	silicom_led_info = info->led_info;
	silicom_gpio_channels = info->gpio_channels;
	silicom_gpiochip = info->gpiochip;
	silicom_gpiochip->ngpio = info->ngpio;

	return 1;
}

static const struct dmi_system_id silicom_dmi_ids[] __initconst = {
	{
		.callback = silicom_platform_info_init,
		.ident = "Silicom Cordoba (Generic)",
		.matches = {
			DMI_MATCH(DMI_BOARD_VENDOR, "Silicom"),
			DMI_MATCH(DMI_BOARD_NAME, "80300-0214-G"),
		},
		.driver_data = &silicom_generic_cordoba_info,
	},
	{
		.callback = silicom_platform_info_init,
		.ident = "Silicom Cordoba (Generic)",
		.matches = {
			DMI_MATCH(DMI_BOARD_VENDOR, "Silicom"),
			DMI_MATCH(DMI_BOARD_NAME, "80500-0214-G"),
		},
		.driver_data = &silicom_generic_cordoba_info,
	},
	{
		 .callback = silicom_platform_info_init,
		 .ident = "Silicom Cordoba (plat_0222)",
		 .matches = {
			DMI_MATCH(DMI_BOARD_VENDOR, "Silicom"),
			DMI_MATCH(DMI_BOARD_NAME, "80300-0222-G"),
		 },
		.driver_data = &silicom_plat_0222_cordoba_info,
	},
	{ },
};
MODULE_DEVICE_TABLE(dmi, silicom_dmi_ids);

static int __init silicom_platform_init(void)
{
	if (!dmi_check_system(silicom_dmi_ids)) {
		pr_err("No DMI match for this platform\n");
		return -ENODEV;
	}
	silicom_platform_dev = platform_create_bundle(&silicom_platform_driver,
						      silicom_platform_probe,
						      NULL, 0, NULL, 0);

	return PTR_ERR_OR_ZERO(silicom_platform_dev);
}

static void __exit silicom_platform_exit(void)
{
	platform_device_unregister(silicom_platform_dev);
	platform_driver_unregister(&silicom_platform_driver);
}

module_init(silicom_platform_init);
module_exit(silicom_platform_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Henry Shi <henrys@silicom-usa.com>");
MODULE_DESCRIPTION("Platform driver for Silicom network appliances");