mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-25 13:14:07 +08:00
f19fd81ba1
Adds Multi-function devices driver for SMpro co-processor found on the Mt.Jade hardware reference platform with Ampere's Altra processor family. Signed-off-by: Quan Nguyen <quan@os.amperecomputing.com> Signed-off-by: Lee Jones <lee@kernel.org> Link: https://lore.kernel.org/r/20220929094321.770125-9-quan@os.amperecomputing.com
139 lines
3.4 KiB
C
139 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Ampere Altra Family SMPro core driver
|
|
* Copyright (c) 2022, Ampere Computing LLC
|
|
*/
|
|
|
|
#include <linux/i2c.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mfd/core.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/regmap.h>
|
|
|
|
/* Identification Registers */
|
|
#define MANUFACTURER_ID_REG 0x02
|
|
#define AMPERE_MANUFACTURER_ID 0xCD3A
|
|
|
|
#define CORE_CE_ERR_DATA 0x82
|
|
#define CORE_UE_ERR_DATA 0x85
|
|
#define MEM_CE_ERR_DATA 0x92
|
|
#define MEM_UE_ERR_DATA 0x95
|
|
#define PCIE_CE_ERR_DATA 0xC2
|
|
#define PCIE_UE_ERR_DATA 0xC5
|
|
#define OTHER_CE_ERR_DATA 0xD2
|
|
#define OTHER_UE_ERR_DATA 0xDA
|
|
|
|
static int smpro_core_write(void *context, const void *data, size_t count)
|
|
{
|
|
struct device *dev = context;
|
|
struct i2c_client *i2c = to_i2c_client(dev);
|
|
int ret;
|
|
|
|
ret = i2c_master_send(i2c, data, count);
|
|
if (unlikely(ret != count))
|
|
return (ret < 0) ? ret : -EIO;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int smpro_core_read(void *context, const void *reg, size_t reg_size,
|
|
void *val, size_t val_size)
|
|
{
|
|
struct device *dev = context;
|
|
struct i2c_client *i2c = to_i2c_client(dev);
|
|
struct i2c_msg xfer[2];
|
|
unsigned char buf[2];
|
|
int ret;
|
|
|
|
xfer[0].addr = i2c->addr;
|
|
xfer[0].flags = 0;
|
|
|
|
buf[0] = *(u8 *)reg;
|
|
buf[1] = val_size;
|
|
xfer[0].len = 2;
|
|
xfer[0].buf = buf;
|
|
|
|
xfer[1].addr = i2c->addr;
|
|
xfer[1].flags = I2C_M_RD;
|
|
xfer[1].len = val_size;
|
|
xfer[1].buf = val;
|
|
|
|
ret = i2c_transfer(i2c->adapter, xfer, 2);
|
|
if (unlikely(ret != 2))
|
|
return (ret < 0) ? ret : -EIO;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct regmap_bus smpro_regmap_bus = {
|
|
.read = smpro_core_read,
|
|
.write = smpro_core_write,
|
|
.val_format_endian_default = REGMAP_ENDIAN_BIG,
|
|
};
|
|
|
|
static bool smpro_core_readable_noinc_reg(struct device *dev, unsigned int reg)
|
|
{
|
|
return (reg == CORE_CE_ERR_DATA || reg == CORE_UE_ERR_DATA ||
|
|
reg == MEM_CE_ERR_DATA || reg == MEM_UE_ERR_DATA ||
|
|
reg == PCIE_CE_ERR_DATA || reg == PCIE_UE_ERR_DATA ||
|
|
reg == OTHER_CE_ERR_DATA || reg == OTHER_UE_ERR_DATA);
|
|
}
|
|
|
|
static const struct regmap_config smpro_regmap_config = {
|
|
.reg_bits = 8,
|
|
.val_bits = 16,
|
|
.readable_noinc_reg = smpro_core_readable_noinc_reg,
|
|
};
|
|
|
|
static const struct mfd_cell smpro_devs[] = {
|
|
MFD_CELL_NAME("smpro-hwmon"),
|
|
MFD_CELL_NAME("smpro-errmon"),
|
|
MFD_CELL_NAME("smpro-misc"),
|
|
};
|
|
|
|
static int smpro_core_probe(struct i2c_client *i2c)
|
|
{
|
|
const struct regmap_config *config;
|
|
struct regmap *regmap;
|
|
unsigned int val;
|
|
int ret;
|
|
|
|
config = device_get_match_data(&i2c->dev);
|
|
if (!config)
|
|
return -EINVAL;
|
|
|
|
regmap = devm_regmap_init(&i2c->dev, &smpro_regmap_bus, &i2c->dev, config);
|
|
if (IS_ERR(regmap))
|
|
return PTR_ERR(regmap);
|
|
|
|
ret = regmap_read(regmap, MANUFACTURER_ID_REG, &val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (val != AMPERE_MANUFACTURER_ID)
|
|
return -ENODEV;
|
|
|
|
return devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO,
|
|
smpro_devs, ARRAY_SIZE(smpro_devs), NULL, 0, NULL);
|
|
}
|
|
|
|
static const struct of_device_id smpro_core_of_match[] = {
|
|
{ .compatible = "ampere,smpro", .data = &smpro_regmap_config },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, smpro_core_of_match);
|
|
|
|
static struct i2c_driver smpro_core_driver = {
|
|
.probe_new = smpro_core_probe,
|
|
.driver = {
|
|
.name = "smpro-core",
|
|
.of_match_table = smpro_core_of_match,
|
|
},
|
|
};
|
|
module_i2c_driver(smpro_core_driver);
|
|
|
|
MODULE_AUTHOR("Quan Nguyen <quan@os.amperecomputing.com>");
|
|
MODULE_DESCRIPTION("SMPRO CORE - I2C driver");
|
|
MODULE_LICENSE("GPL");
|