Commit 296f5568 authored by Russ Weight's avatar Russ Weight Committed by Lee Jones
Browse files

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: default avatarRuss Weight <russell.h.weight@intel.com>
Signed-off-by: default avatarXu Yilun <yilun.xu@intel.com>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent 92eba680

Documentation/ABI/testing/sysfs-driver-intel-m10-bmc

+21 −0
Original line number Diff line number Diff line
@@ -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".

drivers/mfd/intel-m10-bmc.c

+43 −0
Original line number Diff line number Diff line
@@ -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);

include/linux/mfd/intel-m10-bmc.h

+9 −0
Original line number Diff line number Diff line
@@ -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)