blob: 8d833836a6d322c2a6331097cb27bb6349bc37cf [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0+
/*
* Nvidia line card driver
*
* Copyright (C) 2020 Nvidia Technologies Ltd.
*/
#include <linux/device.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/platform_data/mlxcpld.h>
#include <linux/platform_data/mlxreg.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
/* I2C bus IO offsets */
#define MLXREG_LC_REG_CPLD1_VER_OFFSET 0x2500
#define MLXREG_LC_REG_FPGA1_VER_OFFSET 0x2501
#define MLXREG_LC_REG_CPLD1_PN_OFFSET 0x2504
#define MLXREG_LC_REG_FPGA1_PN_OFFSET 0x2506
#define MLXREG_LC_REG_RESET_CAUSE_OFFSET 0x251d
#define MLXREG_LC_REG_LED1_OFFSET 0x2520
#define MLXREG_LC_REG_GP0_OFFSET 0x252e
#define MLXREG_LC_REG_FIELD_UPGRADE 0x2534
#define MLXREG_LC_CHANNEL_I2C_REG 0x25dc
#define MLXREG_LC_REG_CPLD1_MVER_OFFSET 0x25de
#define MLXREG_LC_REG_FPGA1_MVER_OFFSET 0x25df
#define MLXREG_LC_REG_MAX_POWER_OFFSET 0x25f1
#define MLXREG_LC_REG_CONFIG_OFFSET 0x25fb
#define MLXREG_LC_REG_MAX 0x3fff
/**
* enum mlxreg_lc_type - line cards types
*
* @MLXREG_LC_SN4800_C16: 100GbE line card with 16 QSFP28 ports;
*/
enum mlxreg_lc_type {
MLXREG_LC_SN4800_C16 = 0x0000,
};
/**
* enum mlxreg_lc_state - line cards state
*
* @MLXREG_LC_INITIALIZED: line card is initialized;
* @MLXREG_LC_POWERED: line card is powered;
* @MLXREG_LC_SYNCED: line card is synchronized between hardware and firmware;
*/
enum mlxreg_lc_state {
MLXREG_LC_INITIALIZED = BIT(0),
MLXREG_LC_POWERED = BIT(1),
MLXREG_LC_SYNCED = BIT(2),
};
#define MLXREG_LC_CONFIGURED (MLXREG_LC_INITIALIZED | MLXREG_LC_POWERED | MLXREG_LC_SYNCED)
/* mlxreg_lc - device private data
* @dev: platform device;
* @lock: line card lock;
* @par_regmap: parent device regmap handle;
* @data: pltaform core data;
* @io_data: register access platform data;
* @led_data: LED platform data ;
* @mux_data: MUX platform data;
* @led: LED device;
* @io_regs: register access device;
* @mux_brdinfo: mux configuration;
* @mux: mux devices;
* @aux_devs: I2C devices feeding by auxiliary power;
* @aux_devs_num: number of I2C devices feeding by auxiliary power;
* @main_devs: I2C devices feeding by main power;
* @main_devs_num: number of I2C devices feeding by main power;
* @state: line card state;
*/
struct mlxreg_lc {
struct device *dev;
struct mutex lock; /* line card access lock */
void *par_regmap;
struct mlxreg_core_data *data;
struct mlxreg_core_platform_data *io_data;
struct mlxreg_core_platform_data *led_data;
struct mlxcpld_mux_plat_data *mux_data;
struct platform_device *led;
struct platform_device *io_regs;
struct i2c_board_info *mux_brdinfo;
struct platform_device *mux;
struct mlxreg_hotplug_device *aux_devs;
int aux_devs_num;
struct mlxreg_hotplug_device *main_devs;
int main_devs_num;
enum mlxreg_lc_state state;
};
static bool mlxreg_lc_writeable_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case MLXREG_LC_REG_LED1_OFFSET:
case MLXREG_LC_REG_GP0_OFFSET:
case MLXREG_LC_REG_FIELD_UPGRADE:
case MLXREG_LC_CHANNEL_I2C_REG:
return true;
}
return false;
}
static bool mlxreg_lc_readable_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case MLXREG_LC_REG_CPLD1_VER_OFFSET:
case MLXREG_LC_REG_FPGA1_VER_OFFSET:
case MLXREG_LC_REG_CPLD1_PN_OFFSET:
case MLXREG_LC_REG_FPGA1_PN_OFFSET:
case MLXREG_LC_REG_RESET_CAUSE_OFFSET:
case MLXREG_LC_REG_LED1_OFFSET:
case MLXREG_LC_REG_GP0_OFFSET:
case MLXREG_LC_REG_FIELD_UPGRADE:
case MLXREG_LC_CHANNEL_I2C_REG:
case MLXREG_LC_REG_CPLD1_MVER_OFFSET:
case MLXREG_LC_REG_FPGA1_MVER_OFFSET:
case MLXREG_LC_REG_MAX_POWER_OFFSET:
case MLXREG_LC_REG_CONFIG_OFFSET:
return true;
}
return false;
}
static bool mlxreg_lc_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case MLXREG_LC_REG_CPLD1_VER_OFFSET:
case MLXREG_LC_REG_FPGA1_VER_OFFSET:
case MLXREG_LC_REG_CPLD1_PN_OFFSET:
case MLXREG_LC_REG_FPGA1_PN_OFFSET:
case MLXREG_LC_REG_RESET_CAUSE_OFFSET:
case MLXREG_LC_REG_LED1_OFFSET:
case MLXREG_LC_REG_GP0_OFFSET:
case MLXREG_LC_REG_FIELD_UPGRADE:
case MLXREG_LC_CHANNEL_I2C_REG:
case MLXREG_LC_REG_CPLD1_MVER_OFFSET:
case MLXREG_LC_REG_FPGA1_MVER_OFFSET:
case MLXREG_LC_REG_MAX_POWER_OFFSET:
case MLXREG_LC_REG_CONFIG_OFFSET:
return true;
}
return false;
}
static const struct reg_default mlxreg_lc_regmap_default[] = {
{ MLXREG_LC_CHANNEL_I2C_REG, 0x00 },
};
/* Configuration for the register map of a device with 2 bytes address space. */
static const struct regmap_config mlxreg_lc_regmap_conf = {
.reg_bits = 16,
.val_bits = 8,
.max_register = MLXREG_LC_REG_MAX,
.cache_type = REGCACHE_FLAT,
.writeable_reg = mlxreg_lc_writeable_reg,
.readable_reg = mlxreg_lc_readable_reg,
.volatile_reg = mlxreg_lc_volatile_reg,
.reg_defaults = mlxreg_lc_regmap_default,
.num_reg_defaults = ARRAY_SIZE(mlxreg_lc_regmap_default),
};
/* Default channels vector.
* It contains only the channels, which physically connected to the devices,
* empty channels are skipped.
*/
static int mlxreg_lc_chan[] = {
0x04, 0x05, 0x06, 0x07, 0x08, 0x10, 0x20, 0x21, 0x22, 0x23, 0x40, 0x41,
0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d,
0x4e, 0x4f
};
/* Defaul mux configuration. */
static struct mlxcpld_mux_plat_data mlxreg_lc_mux_data[] = {
{
.chan_ids = mlxreg_lc_chan,
.num_adaps = ARRAY_SIZE(mlxreg_lc_chan),
.sel_reg_addr = MLXREG_LC_CHANNEL_I2C_REG,
.reg_size = 2,
},
};
/* Defaul mux board info. */
static struct i2c_board_info mlxreg_lc_mux_brdinfo = {
I2C_BOARD_INFO("i2c-mux-mlxcpld", 0x32),
};
/* Line card default auxiliary power static devices. */
static struct i2c_board_info mlxreg_lc_aux_pwr_devices[] = {
{
I2C_BOARD_INFO("24c32", 0x51),
},
{
I2C_BOARD_INFO("24c32", 0x51),
},
};
/* Line card default auxiliary power board info. */
static struct mlxreg_hotplug_device mlxreg_lc_aux_pwr_brdinfo[] = {
{
.brdinfo = &mlxreg_lc_aux_pwr_devices[0],
.nr = 3,
},
{
.brdinfo = &mlxreg_lc_aux_pwr_devices[1],
.nr = 4,
},
};
/* Line card default main power static devices. */
static struct i2c_board_info mlxreg_lc_main_pwr_devices[] = {
{
I2C_BOARD_INFO("mp2975", 0x62),
},
{
I2C_BOARD_INFO("mp2975", 0x64),
},
{
I2C_BOARD_INFO("max11603", 0x6d),
},
{
I2C_BOARD_INFO("lm25066", 0x15),
},
};
/* Line card default main power board info. */
static struct mlxreg_hotplug_device mlxreg_lc_main_pwr_brdinfo[] = {
{
.brdinfo = &mlxreg_lc_main_pwr_devices[0],
.nr = 0,
},
{
.brdinfo = &mlxreg_lc_main_pwr_devices[1],
.nr = 0,
},
{
.brdinfo = &mlxreg_lc_main_pwr_devices[2],
.nr = 1,
},
{
.brdinfo = &mlxreg_lc_main_pwr_devices[3],
.nr = 2,
},
};
/* LED default data. */
static struct mlxreg_core_data mlxreg_lc_led_data[] = {
{
.label = "status:green",
.reg = MLXREG_LC_REG_LED1_OFFSET,
.mask = GENMASK(7, 4),
},
{
.label = "status:orange",
.reg = MLXREG_LC_REG_LED1_OFFSET,
.mask = GENMASK(7, 4),
},
};
static struct mlxreg_core_platform_data mlxreg_lc_led = {
.identity = "pci",
.data = mlxreg_lc_led_data,
.counter = ARRAY_SIZE(mlxreg_lc_led_data),
};
/* Default register access data. */
static struct mlxreg_core_data mlxreg_lc_io_data[] = {
{
.label = "cpld1_version",
.reg = MLXREG_LC_REG_CPLD1_VER_OFFSET,
.bit = GENMASK(7, 0),
.mode = 0444,
},
{
.label = "fpga1_version",
.reg = MLXREG_LC_REG_FPGA1_VER_OFFSET,
.bit = GENMASK(7, 0),
.mode = 0444,
},
{
.label = "cpld1_pn",
.reg = MLXREG_LC_REG_CPLD1_PN_OFFSET,
.bit = GENMASK(15, 0),
.mode = 0444,
.regnum = 2,
},
{
.label = "fpga1_pn",
.reg = MLXREG_LC_REG_FPGA1_PN_OFFSET,
.bit = GENMASK(15, 0),
.mode = 0444,
.regnum = 2,
},
{
.label = "cpld1_version_min",
.reg = MLXREG_LC_REG_CPLD1_MVER_OFFSET,
.bit = GENMASK(7, 0),
.mode = 0444,
},
{
.label = "fpga1_version_min",
.reg = MLXREG_LC_REG_FPGA1_MVER_OFFSET,
.bit = GENMASK(7, 0),
.mode = 0444,
},
{
.label = "reset_fpga_not_done",
.reg = MLXREG_LC_REG_RESET_CAUSE_OFFSET,
.mask = GENMASK(7, 0) & ~BIT(1),
.mode = 0444,
},
{
.label = "reset_aux_pwr_or_ref",
.reg = MLXREG_LC_REG_RESET_CAUSE_OFFSET,
.mask = GENMASK(7, 0) & ~BIT(2),
.mode = 0444,
},
{
.label = "reset_dc_dc_pwr_fail",
.reg = MLXREG_LC_REG_RESET_CAUSE_OFFSET,
.mask = GENMASK(7, 0) & ~BIT(3),
.mode = 0444,
},
{
.label = "reset_from_chassis",
.reg = MLXREG_LC_REG_RESET_CAUSE_OFFSET,
.mask = GENMASK(7, 0) & ~BIT(4),
.mode = 0444,
},
{
.label = "reset_pwr_off_from_chassis",
.reg = MLXREG_LC_REG_RESET_CAUSE_OFFSET,
.mask = GENMASK(7, 0) & ~BIT(5),
.mode = 0444,
},
{
.label = "reset_line_card",
.reg = MLXREG_LC_REG_RESET_CAUSE_OFFSET,
.mask = GENMASK(7, 0) & ~BIT(6),
.mode = 0444,
},
{
.label = "reset_line_card_pwr_en",
.reg = MLXREG_LC_REG_RESET_CAUSE_OFFSET,
.mask = GENMASK(7, 0) & ~BIT(7),
.mode = 0444,
},
{
.label = "cpld_upgrade_en",
.reg = MLXREG_LC_REG_FIELD_UPGRADE,
.mask = GENMASK(7, 0) & ~BIT(0),
.mode = 0644,
.secured = 1,
},
{
.label = "fpga_upgrade_en",
.reg = MLXREG_LC_REG_FIELD_UPGRADE,
.mask = GENMASK(7, 0) & ~BIT(1),
.mode = 0644,
.secured = 1,
},
{
.label = "qsfp_pwr_en",
.reg = MLXREG_LC_REG_GP0_OFFSET,
.mask = GENMASK(7, 0) & ~BIT(0),
.mode = 0644,
},
{
.label = "vpd_wp",
.reg = MLXREG_LC_REG_GP0_OFFSET,
.mask = GENMASK(7, 0) & ~BIT(3),
.mode = 0644,
.secured = 1,
},
{
.label = "agb_spi_burn_en",
.reg = MLXREG_LC_REG_GP0_OFFSET,
.mask = GENMASK(7, 0) & ~BIT(5),
.mode = 0644,
.secured = 1,
},
{
.label = "fpga_spi_burn_en",
.reg = MLXREG_LC_REG_GP0_OFFSET,
.mask = GENMASK(7, 0) & ~BIT(6),
.mode = 0644,
.secured = 1,
},
{
.label = "max_power",
.reg = MLXREG_LC_REG_MAX_POWER_OFFSET,
.bit = GENMASK(15, 0),
.mode = 0444,
.regnum = 2,
},
{
.label = "config",
.reg = MLXREG_LC_REG_CONFIG_OFFSET,
.bit = GENMASK(15, 0),
.mode = 0444,
.regnum = 2,
},
};
static struct mlxreg_core_platform_data mlxreg_lc_regs_io = {
.data = mlxreg_lc_io_data,
.counter = ARRAY_SIZE(mlxreg_lc_io_data),
};
static int
mlxreg_lc_create_static_devices(struct mlxreg_lc *mlxreg_lc, struct mlxreg_hotplug_device *devs,
int size)
{
struct mlxreg_hotplug_device *dev = devs;
int i, ret;
/* Create static I2C device feeding by auxiliary or main power. */
for (i = 0; i < size; i++, dev++) {
dev->client = i2c_new_client_device(dev->adapter, dev->brdinfo);
if (IS_ERR(dev->client)) {
dev_err(mlxreg_lc->dev, "Failed to create client %s at bus %d at addr 0x%02x\n",
dev->brdinfo->type, dev->nr, dev->brdinfo->addr);
dev->adapter = NULL;
ret = PTR_ERR(dev->client);
goto fail_create_static_devices;
}
}
return 0;
fail_create_static_devices:
while (--i >= 0) {
dev = devs + i;
i2c_unregister_device(dev->client);
dev->client = NULL;
}
return ret;
}
static void
mlxreg_lc_destroy_static_devices(struct mlxreg_lc *mlxreg_lc, struct mlxreg_hotplug_device *devs,
int size)
{
struct mlxreg_hotplug_device *dev = devs;
int i;
/* Destroy static I2C device feeding by auxiliary or main power. */
for (i = 0; i < size; i++, dev++) {
if (dev->client) {
i2c_unregister_device(dev->client);
dev->client = NULL;
}
}
}
static int mlxreg_lc_power_on_off(struct mlxreg_lc *mlxreg_lc, u8 action)
{
u32 regval;
int err;
err = regmap_read(mlxreg_lc->par_regmap, mlxreg_lc->data->reg_pwr, &regval);
if (err)
goto regmap_read_fail;
if (action)
regval |= BIT(mlxreg_lc->data->slot - 1);
else
regval &= ~BIT(mlxreg_lc->data->slot - 1);
err = regmap_write(mlxreg_lc->par_regmap, mlxreg_lc->data->reg_pwr, regval);
regmap_read_fail:
return err;
}
static int mlxreg_lc_enable_disable(struct mlxreg_lc *mlxreg_lc, bool action)
{
u32 regval;
int err;
/*
* Hardware holds the line card after powering on in the disabled state. Holding line card
* in disabled state protects access to the line components, like FPGA and gearboxes.
* Line card should be enabled in order to get it in operational state. Line card could be
* disabled for moving it to non-operational state. Enabling line card does not affect the
* line card which is already has been enabled. Disabling does not affect the disabled line
* card.
*/
err = regmap_read(mlxreg_lc->par_regmap, mlxreg_lc->data->reg_ena, &regval);
if (err)
goto regmap_read_fail;
if (action)
regval |= BIT(mlxreg_lc->data->slot - 1);
else
regval &= ~BIT(mlxreg_lc->data->slot - 1);
err = regmap_write(mlxreg_lc->par_regmap, mlxreg_lc->data->reg_ena, regval);
regmap_read_fail:
return err;
}
static int
mlxreg_lc_sn4800_c16_config_init(struct mlxreg_lc *mlxreg_lc, void *regmap,
struct mlxreg_core_data *data)
{
struct device *dev = &data->hpdev.client->dev;
/* Set line card configuration according to the type. */
mlxreg_lc->mux_data = mlxreg_lc_mux_data;
mlxreg_lc->io_data = &mlxreg_lc_regs_io;
mlxreg_lc->led_data = &mlxreg_lc_led;
mlxreg_lc->mux_brdinfo = &mlxreg_lc_mux_brdinfo;
mlxreg_lc->aux_devs = devm_kmemdup(dev, mlxreg_lc_aux_pwr_brdinfo,
sizeof(mlxreg_lc_aux_pwr_brdinfo), GFP_KERNEL);
if (!mlxreg_lc->aux_devs)
return -ENOMEM;
mlxreg_lc->aux_devs_num = ARRAY_SIZE(mlxreg_lc_aux_pwr_brdinfo);
mlxreg_lc->main_devs = devm_kmemdup(dev, mlxreg_lc_main_pwr_brdinfo,
sizeof(mlxreg_lc_main_pwr_brdinfo), GFP_KERNEL);
if (!mlxreg_lc->main_devs)
return -ENOMEM;
mlxreg_lc->main_devs_num = ARRAY_SIZE(mlxreg_lc_main_pwr_brdinfo);
return 0;
}
static void
mlxreg_lc_state_update(struct mlxreg_lc *mlxreg_lc, enum mlxreg_lc_state state, u8 action)
{
if (action)
mlxreg_lc->state |= state;
else
mlxreg_lc->state &= ~state;
}
static void
mlxreg_lc_state_update_locked(struct mlxreg_lc *mlxreg_lc, enum mlxreg_lc_state state, u8 action)
{
mutex_lock(&mlxreg_lc->lock);
if (action)
mlxreg_lc->state |= state;
else
mlxreg_lc->state &= ~state;
mutex_unlock(&mlxreg_lc->lock);
}
/*
* Callback is to be called from mlxreg-hotplug driver to notify about line card about received
* event.
*/
static int mlxreg_lc_event_handler(void *handle, enum mlxreg_hotplug_kind kind, u8 action)
{
struct mlxreg_lc *mlxreg_lc = handle;
int err = 0;
dev_info(mlxreg_lc->dev, "linecard#%d state %d event kind %d action %d\n",
mlxreg_lc->data->slot, mlxreg_lc->state, kind, action);
mutex_lock(&mlxreg_lc->lock);
if (!(mlxreg_lc->state & MLXREG_LC_INITIALIZED))
goto mlxreg_lc_non_initialzed_exit;
switch (kind) {
case MLXREG_HOTPLUG_LC_SYNCED:
/*
* Synchronization event - hardware and firmware are synchronized. Power on/off
* line card - to allow/disallow main power source.
*/
mlxreg_lc_state_update(mlxreg_lc, MLXREG_LC_SYNCED, action);
/* Power line card if it is not powered yet. */
if (!(mlxreg_lc->state & MLXREG_LC_POWERED) && action) {
err = mlxreg_lc_power_on_off(mlxreg_lc, 1);
if (err)
goto mlxreg_lc_power_on_off_fail;
}
/* In case line card is configured - enable it. */
if (mlxreg_lc->state & MLXREG_LC_CONFIGURED && action)
err = mlxreg_lc_enable_disable(mlxreg_lc, 1);
break;
case MLXREG_HOTPLUG_LC_POWERED:
/* Power event - attach or de-attach line card device feeding by the main power. */
if (action) {
/* Do not create devices, if line card is already powered. */
if (mlxreg_lc->state & MLXREG_LC_POWERED) {
/* In case line card is configured - enable it. */
if (mlxreg_lc->state & MLXREG_LC_CONFIGURED)
err = mlxreg_lc_enable_disable(mlxreg_lc, 1);
goto mlxreg_lc_enable_disable_exit;
}
err = mlxreg_lc_create_static_devices(mlxreg_lc, mlxreg_lc->main_devs,
mlxreg_lc->main_devs_num);
if (err)
goto mlxreg_lc_create_static_devices_fail;
/* In case line card is already in ready state - enable it. */
if (mlxreg_lc->state & MLXREG_LC_CONFIGURED)
err = mlxreg_lc_enable_disable(mlxreg_lc, 1);
} else {
mlxreg_lc_destroy_static_devices(mlxreg_lc, mlxreg_lc->main_devs,
mlxreg_lc->main_devs_num);
}
mlxreg_lc_state_update(mlxreg_lc, MLXREG_LC_POWERED, action);
break;
case MLXREG_HOTPLUG_LC_READY:
/*
* Ready event – enable line card by releasing it from reset or disable it by put
* to reset state.
*/
err = mlxreg_lc_enable_disable(mlxreg_lc, !!action);
break;
case MLXREG_HOTPLUG_LC_THERMAL:
/* Thermal shutdown event – power off line card. */
if (action)
err = mlxreg_lc_power_on_off(mlxreg_lc, 0);
break;
default:
break;
}
mlxreg_lc_enable_disable_exit:
mlxreg_lc_power_on_off_fail:
mlxreg_lc_create_static_devices_fail:
mlxreg_lc_non_initialzed_exit:
mutex_unlock(&mlxreg_lc->lock);
return err;
}
/*
* Callback is to be called from i2c-mux-mlxcpld driver to indicate that all adapter devices has
* been created.
*/
static int mlxreg_lc_completion_notify(void *handle, struct i2c_adapter *parent,
struct i2c_adapter *adapters[])
{
struct mlxreg_hotplug_device *main_dev, *aux_dev;
struct mlxreg_lc *mlxreg_lc = handle;
u32 regval;
int i, err;
/* Update I2C devices feeding by auxiliary power. */
aux_dev = mlxreg_lc->aux_devs;
for (i = 0; i < mlxreg_lc->aux_devs_num; i++, aux_dev++) {
aux_dev->adapter = adapters[aux_dev->nr];
aux_dev->nr = adapters[aux_dev->nr]->nr;
}
err = mlxreg_lc_create_static_devices(mlxreg_lc, mlxreg_lc->aux_devs,
mlxreg_lc->aux_devs_num);
if (err)
return err;
/* Update I2C devices feeding by main power. */
main_dev = mlxreg_lc->main_devs;
for (i = 0; i < mlxreg_lc->main_devs_num; i++, main_dev++) {
main_dev->adapter = adapters[main_dev->nr];
main_dev->nr = adapters[main_dev->nr]->nr;
}
/* Verify if line card is powered. */
err = regmap_read(mlxreg_lc->par_regmap, mlxreg_lc->data->reg_pwr, &regval);
if (err)
goto mlxreg_lc_regmap_read_power_fail;
if (regval & mlxreg_lc->data->mask) {
err = mlxreg_lc_create_static_devices(mlxreg_lc, mlxreg_lc->main_devs,
mlxreg_lc->main_devs_num);
if (err)
goto mlxreg_lc_create_static_devices_failed;
mlxreg_lc_state_update_locked(mlxreg_lc, MLXREG_LC_POWERED, 1);
}
/* Verify if line card is synchronized. */
err = regmap_read(mlxreg_lc->par_regmap, mlxreg_lc->data->reg_sync, &regval);
if (err)
goto mlxreg_lc_regmap_read_sync_fail;
/* Power on line card if necessary. */
if (regval & mlxreg_lc->data->mask) {
mlxreg_lc->state |= MLXREG_LC_SYNCED;
mlxreg_lc_state_update_locked(mlxreg_lc, MLXREG_LC_SYNCED, 1);
if (mlxreg_lc->state & ~MLXREG_LC_POWERED) {
err = mlxreg_lc_power_on_off(mlxreg_lc, 1);
if (err)
goto mlxreg_lc_regmap_power_on_off_fail;
}
}
mlxreg_lc_state_update_locked(mlxreg_lc, MLXREG_LC_INITIALIZED, 1);
return 0;
mlxreg_lc_regmap_power_on_off_fail:
mlxreg_lc_regmap_read_sync_fail:
if (mlxreg_lc->state & MLXREG_LC_POWERED)
mlxreg_lc_destroy_static_devices(mlxreg_lc, mlxreg_lc->main_devs,
mlxreg_lc->main_devs_num);
mlxreg_lc_create_static_devices_failed:
mlxreg_lc_destroy_static_devices(mlxreg_lc, mlxreg_lc->aux_devs, mlxreg_lc->aux_devs_num);
mlxreg_lc_regmap_read_power_fail:
return err;
}
static int
mlxreg_lc_config_init(struct mlxreg_lc *mlxreg_lc, void *regmap,
struct mlxreg_core_data *data)
{
struct device *dev = &data->hpdev.client->dev;
int lsb, err;
u32 regval;
/* Validate line card type. */
err = regmap_read(regmap, MLXREG_LC_REG_CONFIG_OFFSET, &lsb);
err = (!err) ? regmap_read(regmap, MLXREG_LC_REG_CONFIG_OFFSET, &regval) : err;
if (err)
return err;
regval = (regval & GENMASK(7, 0)) << 8 | (lsb & GENMASK(7, 0));
switch (regval) {
case MLXREG_LC_SN4800_C16:
err = mlxreg_lc_sn4800_c16_config_init(mlxreg_lc, regmap, data);
if (err) {
dev_err(dev, "Failed to config client %s at bus %d at addr 0x%02x\n",
data->hpdev.brdinfo->type, data->hpdev.nr,
data->hpdev.brdinfo->addr);
return err;
}
break;
default:
return -ENODEV;
}
/* Create mux infrastructure. */
mlxreg_lc->mux_data->handle = mlxreg_lc;
mlxreg_lc->mux_data->completion_notify = mlxreg_lc_completion_notify;
mlxreg_lc->mux_brdinfo->platform_data = mlxreg_lc->mux_data;
mlxreg_lc->mux = platform_device_register_resndata(dev, "i2c-mux-mlxcpld", data->hpdev.nr,
NULL, 0, mlxreg_lc->mux_data,
sizeof(*mlxreg_lc->mux_data));
if (IS_ERR(mlxreg_lc->mux)) {
dev_err(dev, "Failed to create mux infra for client %s at bus %d at addr 0x%02x\n",
data->hpdev.brdinfo->type, data->hpdev.nr, data->hpdev.brdinfo->addr);
return PTR_ERR(mlxreg_lc->mux);
}
/* Register IO access driver. */
if (mlxreg_lc->io_data) {
mlxreg_lc->io_data->regmap = regmap;
mlxreg_lc->io_regs =
platform_device_register_resndata(dev, "mlxreg-io", data->hpdev.nr, NULL, 0,
mlxreg_lc->io_data, sizeof(*mlxreg_lc->io_data));
if (IS_ERR(mlxreg_lc->io_regs)) {
dev_err(dev, "Failed to create regio for client %s at bus %d at addr 0x%02x\n",
data->hpdev.brdinfo->type, data->hpdev.nr,
data->hpdev.brdinfo->addr);
err = PTR_ERR(mlxreg_lc->io_regs);
goto fail_register_io;
}
}
/* Register LED driver. */
if (mlxreg_lc->led_data) {
mlxreg_lc->led_data->regmap = regmap;
mlxreg_lc->led =
platform_device_register_resndata(dev, "leds-mlxreg", data->hpdev.nr, NULL, 0,
mlxreg_lc->led_data,
sizeof(*mlxreg_lc->led_data));
if (IS_ERR(mlxreg_lc->led)) {
dev_err(dev, "Failed to create LED objects for client %s at bus %d at addr 0x%02x\n",
data->hpdev.brdinfo->type, data->hpdev.nr,
data->hpdev.brdinfo->addr);
err = PTR_ERR(mlxreg_lc->led);
goto fail_register_led;
}
}
return 0;
fail_register_led:
if (mlxreg_lc->io_regs)
platform_device_unregister(mlxreg_lc->io_regs);
fail_register_io:
if (mlxreg_lc->mux)
platform_device_unregister(mlxreg_lc->mux);
return err;
}
static void mlxreg_lc_config_exit(struct mlxreg_lc *mlxreg_lc)
{
/* Unregister LED driver. */
if (mlxreg_lc->led)
platform_device_unregister(mlxreg_lc->led);
/* Unregister IO access driver. */
if (mlxreg_lc->io_regs)
platform_device_unregister(mlxreg_lc->io_regs);
/* Remove mux infrastructure. */
if (mlxreg_lc->mux)
platform_device_unregister(mlxreg_lc->mux);
}
static int mlxreg_lc_probe(struct platform_device *pdev)
{
struct mlxreg_core_hotplug_platform_data *par_pdata;
struct mlxreg_core_data *data;
struct mlxreg_lc *mlxreg_lc;
void *regmap;
int i, err;
data = dev_get_platdata(&pdev->dev);
if (!data)
return -EINVAL;
mlxreg_lc = devm_kzalloc(&pdev->dev, sizeof(*mlxreg_lc), GFP_KERNEL);
if (!mlxreg_lc)
return -ENOMEM;
mutex_init(&mlxreg_lc->lock);
/* Set event notification callback. */
data->notifier->user_handler = mlxreg_lc_event_handler;
data->notifier->handle = mlxreg_lc;
data->hpdev.adapter = i2c_get_adapter(data->hpdev.nr);
if (!data->hpdev.adapter) {
dev_err(&pdev->dev, "Failed to get adapter for bus %d\n",
data->hpdev.nr);
err = -EFAULT;
goto i2c_get_adapter_fail;
}
/* Create device at the top of line card I2C tree.*/
data->hpdev.client = i2c_new_client_device(data->hpdev.adapter,
data->hpdev.brdinfo);
if (IS_ERR(data->hpdev.client)) {
dev_err(&pdev->dev, "Failed to create client %s at bus %d at addr 0x%02x\n",
data->hpdev.brdinfo->type, data->hpdev.nr, data->hpdev.brdinfo->addr);
err = PTR_ERR(data->hpdev.client);
goto i2c_new_device_fail;
}
regmap = devm_regmap_init_i2c(data->hpdev.client,
&mlxreg_lc_regmap_conf);
if (IS_ERR(regmap)) {
dev_err(&pdev->dev, "Failed to create regmap for client %s at bus %d at addr 0x%02x\n",
data->hpdev.brdinfo->type, data->hpdev.nr, data->hpdev.brdinfo->addr);
err = PTR_ERR(regmap);
goto devm_regmap_init_i2c_fail;
}
/* Set default registers. */
for (i = 0; i < mlxreg_lc_regmap_conf.num_reg_defaults; i++) {
err = regmap_write(regmap, mlxreg_lc_regmap_default[i].reg,
mlxreg_lc_regmap_default[i].def);
if (err) {
dev_err(&pdev->dev, "Failed to set default regmap %d for client %s at bus %d at addr 0x%02x\n",
i, data->hpdev.brdinfo->type, data->hpdev.nr,
data->hpdev.brdinfo->addr);
goto regmap_write_fail;
}
}
/* Sync registers with hardware. */
regcache_mark_dirty(regmap);
err = regcache_sync(regmap);
if (err) {
dev_err(&pdev->dev, "Failed to sync regmap for client %s at bus %d at addr 0x%02x\n",
data->hpdev.brdinfo->type, data->hpdev.nr, data->hpdev.brdinfo->addr);
goto regcache_sync_fail;
}
par_pdata = data->hpdev.brdinfo->platform_data;
mlxreg_lc->par_regmap = par_pdata->regmap;
mlxreg_lc->data = data;
mlxreg_lc->dev = &pdev->dev;
platform_set_drvdata(pdev, mlxreg_lc);
/* Configure line card. */
err = mlxreg_lc_config_init(mlxreg_lc, regmap, data);
if (err)
goto mlxreg_lc_config_init_fail;
return 0;
mlxreg_lc_config_init_fail:
regcache_sync_fail:
regmap_write_fail:
devm_regmap_init_i2c_fail:
i2c_unregister_device(data->hpdev.client);
data->hpdev.client = NULL;
i2c_new_device_fail:
i2c_put_adapter(data->hpdev.adapter);
data->hpdev.adapter = NULL;
i2c_get_adapter_fail:
/* Clear event notification callback and handle. */
if (data->notifier) {
data->notifier->user_handler = NULL;
data->notifier->handle = NULL;
}
return err;
}
static int mlxreg_lc_remove(struct platform_device *pdev)
{
struct mlxreg_core_data *data = dev_get_platdata(&pdev->dev);
struct mlxreg_lc *mlxreg_lc = platform_get_drvdata(pdev);
mlxreg_lc_state_update_locked(mlxreg_lc, MLXREG_LC_INITIALIZED, 0);
/*
* Probing and removing are invoked by hotplug events raised upon line card insertion and
* removing. If probing procedure fails all data is cleared. However, hotplug event still
* will be raised on line card removing and activate removing procedure. In this case there
* is nothing to remove.
*/
if (!data->notifier || !data->notifier->handle)
return 0;
/* Clear event notification callback and handle. */
data->notifier->user_handler = NULL;
data->notifier->handle = NULL;
/* Destroy static I2C device feeding by main power. */
mlxreg_lc_destroy_static_devices(mlxreg_lc, mlxreg_lc->main_devs,
mlxreg_lc->main_devs_num);
/* Destroy static I2C device feeding by auxiliary power. */
mlxreg_lc_destroy_static_devices(mlxreg_lc, mlxreg_lc->aux_devs, mlxreg_lc->aux_devs_num);
/* Unregister underlying drivers. */
mlxreg_lc_config_exit(mlxreg_lc);
if (data->hpdev.client) {
i2c_unregister_device(data->hpdev.client);
data->hpdev.client = NULL;
i2c_put_adapter(data->hpdev.adapter);
data->hpdev.adapter = NULL;
}
return 0;
}
static struct platform_driver mlxreg_lc_driver = {
.probe = mlxreg_lc_probe,
.remove = mlxreg_lc_remove,
.driver = {
.name = "mlxreg-lc",
},
};
module_platform_driver(mlxreg_lc_driver);
MODULE_AUTHOR("Vadim Pasternak <vadimp@nvidia.com>");
MODULE_DESCRIPTION("Nvidia line card platform driver");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_ALIAS("platform:mlxreg-lc");