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mfd: intel-m10-bmc: Expose MAC address and count 

Create two sysfs entries for exposing the MAC address and count
from the MAX10 BMC register space. The MAC address is the first
in a sequential block of MAC addresses reserved for the FPGA card.
The MAC count is the number of MAC addresses in the reserved block.

Signed-off-by: Russ Weight <russell.h.weight@intel.com>
Signed-off-by: Xu Yilun <yilun.xu@intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Russ Weight 2021-01-14 15:16:48 -08:00 committed by Lee Jones
parent 92eba6802c
commit 296f5568c6
3 changed files with 73 additions and 0 deletions
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21
Documentation/ABI/testing/sysfs-driver-intel-m10-bmc
View File

@ -13,3 +13,24 @@ Contact: Xu Yilun <yilun.xu@intel.com>
Description: Read only. Returns the firmware version of Intel MAX10
BMC chip.
Format: "0x%x".
What: /sys/bus/spi/devices/.../mac_address
Date: January 2021
KernelVersion: 5.12
Contact: Russ Weight <russell.h.weight@intel.com>
Description: Read only. Returns the first MAC address in a block
of sequential MAC addresses assigned to the board
that is managed by the Intel MAX10 BMC. It is stored in
FLASH storage and is mirrored in the MAX10 BMC register
space.
Format: "%02x:%02x:%02x:%02x:%02x:%02x".
What: /sys/bus/spi/devices/.../mac_count
Date: January 2021
KernelVersion: 5.12
Contact: Russ Weight <russell.h.weight@intel.com>
Description: Read only. Returns the number of sequential MAC
addresses assigned to the board managed by the Intel
MAX10 BMC. This value is stored in FLASH and is mirrored
in the MAX10 BMC register space.
Format: "%u".

43
drivers/mfd/intel-m10-bmc.c
View File

@ -60,9 +60,52 @@ static ssize_t bmcfw_version_show(struct device *dev,
}
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);

9
include/linux/mfd/intel-m10-bmc.h
View File

@ -15,6 +15,15 @@
/* Register offset of system registers */
#define NIOS2_FW_VERSION 0x0
#define M10BMC_MAC_LOW 0x10
#define M10BMC_MAC_BYTE4 GENMASK(7, 0)
#define M10BMC_MAC_BYTE3 GENMASK(15, 8)
#define M10BMC_MAC_BYTE2 GENMASK(23, 16)
#define M10BMC_MAC_BYTE1 GENMASK(31, 24)
#define M10BMC_MAC_HIGH 0x14
#define M10BMC_MAC_BYTE6 GENMASK(7, 0)
#define M10BMC_MAC_BYTE5 GENMASK(15, 8)
#define M10BMC_MAC_COUNT GENMASK(23, 16)
#define M10BMC_TEST_REG 0x3c
#define M10BMC_BUILD_VER 0x68
#define M10BMC_VER_MAJOR_MSK GENMASK(23, 16)