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// SPDX-License-Identifier: GPL-2.0
/*
* Intel MAX 10 Board Management Controller chip
*
* Copyright (C) 2018-2020 Intel Corporation. All rights reserved.
*/
#include <linux/bitfield.h>
#include <linux/init.h>
#include <linux/mfd/core.h>
#include <linux/mfd/intel-m10-bmc.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/regmap.h>
#include <linux/spi/spi.h>
enum m10bmc_type {
M10_N3000,
};
static struct mfd_cell m10bmc_pacn3000_subdevs[] = {
{ .name = "n3000bmc-hwmon" },
{ .name = "n3000bmc-retimer" },
{ .name = "n3000bmc-secure" },
};
static struct regmap_config intel_m10bmc_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
.max_register = M10BMC_MEM_END,
};
static ssize_t bmc_version_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct intel_m10bmc *ddata = dev_get_drvdata(dev);
unsigned int val;
int ret;
ret = m10bmc_sys_read(ddata, M10BMC_BUILD_VER, &val);
if (ret)
return ret;
return sprintf(buf, "0x%x\n", val);
}
static DEVICE_ATTR_RO(bmc_version);
static ssize_t bmcfw_version_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct intel_m10bmc *ddata = dev_get_drvdata(dev);
unsigned int val;
int ret;
ret = m10bmc_sys_read(ddata, NIOS2_FW_VERSION, &val);
if (ret)
return ret;
return sprintf(buf, "0x%x\n", val);
}
static DEVICE_ATTR_RO(bmcfw_version);
static ssize_t mac_address_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct intel_m10bmc *max10 = dev_get_drvdata(dev);
unsigned int macaddr_low, macaddr_high;
int ret;
ret = m10bmc_sys_read(max10, M10BMC_MAC_LOW, &macaddr_low);
if (ret)
return ret;
ret = m10bmc_sys_read(max10, M10BMC_MAC_HIGH, &macaddr_high);
if (ret)
return ret;
return sysfs_emit(buf, "%02x:%02x:%02x:%02x:%02x:%02x\n",
(u8)FIELD_GET(M10BMC_MAC_BYTE1, macaddr_low),
(u8)FIELD_GET(M10BMC_MAC_BYTE2, macaddr_low),
(u8)FIELD_GET(M10BMC_MAC_BYTE3, macaddr_low),
(u8)FIELD_GET(M10BMC_MAC_BYTE4, macaddr_low),
(u8)FIELD_GET(M10BMC_MAC_BYTE5, macaddr_high),
(u8)FIELD_GET(M10BMC_MAC_BYTE6, macaddr_high));
}
static DEVICE_ATTR_RO(mac_address);
static ssize_t mac_count_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct intel_m10bmc *max10 = dev_get_drvdata(dev);
unsigned int macaddr_high;
int ret;
ret = m10bmc_sys_read(max10, M10BMC_MAC_HIGH, &macaddr_high);
if (ret)
return ret;
return sysfs_emit(buf, "%u\n",
(u8)FIELD_GET(M10BMC_MAC_COUNT, macaddr_high));
}
static DEVICE_ATTR_RO(mac_count);
static struct attribute *m10bmc_attrs[] = {
&dev_attr_bmc_version.attr,
&dev_attr_bmcfw_version.attr,
&dev_attr_mac_address.attr,
&dev_attr_mac_count.attr,
NULL,
};
ATTRIBUTE_GROUPS(m10bmc);
static int check_m10bmc_version(struct intel_m10bmc *ddata)
{
unsigned int v;
int ret;
/*
* This check is to filter out the very old legacy BMC versions,
* M10BMC_LEGACY_SYS_BASE is the offset to this old block of mmio
* registers. In the old BMC chips, the BMC version info is stored
* in this old version register (M10BMC_LEGACY_SYS_BASE +
* M10BMC_BUILD_VER), so its read out value would have not been
* LEGACY_INVALID (0xffffffff). But in new BMC chips that the
* driver supports, the value of this register should be
* LEGACY_INVALID.
*/
ret = m10bmc_raw_read(ddata,
M10BMC_LEGACY_SYS_BASE + M10BMC_BUILD_VER, &v);
if (ret)
return -ENODEV;
if (v != M10BMC_VER_LEGACY_INVALID) {
dev_err(ddata->dev, "bad version M10BMC detected\n");
return -ENODEV;
}
return 0;
}
static int intel_m10_bmc_spi_probe(struct spi_device *spi)
{
const struct spi_device_id *id = spi_get_device_id(spi);
struct device *dev = &spi->dev;
struct mfd_cell *cells;
struct intel_m10bmc *ddata;
int ret, n_cell;
ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
if (!ddata)
return -ENOMEM;
ddata->dev = dev;
ddata->regmap =
devm_regmap_init_spi_avmm(spi, &intel_m10bmc_regmap_config);
if (IS_ERR(ddata->regmap)) {
ret = PTR_ERR(ddata->regmap);
dev_err(dev, "Failed to allocate regmap: %d\n", ret);
return ret;
}
spi_set_drvdata(spi, ddata);
ret = check_m10bmc_version(ddata);
if (ret) {
dev_err(dev, "Failed to identify m10bmc hardware\n");
return ret;
}
switch (id->driver_data) {
case M10_N3000:
cells = m10bmc_pacn3000_subdevs;
n_cell = ARRAY_SIZE(m10bmc_pacn3000_subdevs);
break;
default:
return -ENODEV;
}
ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_AUTO, cells, n_cell,
NULL, 0, NULL);
if (ret)
dev_err(dev, "Failed to register sub-devices: %d\n", ret);
return ret;
}
static const struct spi_device_id m10bmc_spi_id[] = {
{ "m10-n3000", M10_N3000 },
{ }
};
MODULE_DEVICE_TABLE(spi, m10bmc_spi_id);
static struct spi_driver intel_m10bmc_spi_driver = {
.driver = {
.name = "intel-m10-bmc",
.dev_groups = m10bmc_groups,
},
.probe = intel_m10_bmc_spi_probe,
.id_table = m10bmc_spi_id,
};
module_spi_driver(intel_m10bmc_spi_driver);
MODULE_DESCRIPTION("Intel MAX 10 BMC Device Driver");
MODULE_AUTHOR("Intel Corporation");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("spi:intel-m10-bmc");
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