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linux/drivers/platform/x86/silicom-platform.c
Dan Carpenter 890a48ca7b
platform/x86: silicom-platform: clean up a check 
The error message in this code can't be reached because value is either
zero or non-zero.  There isn't a third option.  Really, it's nicer to
write this as a one liner.

Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/a58bffb7-0a8b-4195-b273-f65a188ace7b@moroto.mountain
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
2024-01-24 12:34:45 +02:00

999 lines
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// 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;
silicom_mec_port_set(channel, !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");
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