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Commit 46b903a0 authored by David Daney's avatar David Daney Committed by David S. Miller
Browse files

net, thunder, bgx: Add support to get MAC address from ACPI. 

Currently there is no way to get the MAC address in a firmware
independent manner, so set the MAC address of the device directly from
the ACPI tables.

The binding agrees with the proposed standard here:

http://www.uefi.org/sites/default/files/resources/nic-request-v2.pdf



Based on code from: Narinder Dhillon <ndhillon@cavium.com>
                    Tomasz Nowicki <tomasz.nowicki@linaro.org>
                    Robert Richter <rrichter@cavium.com>

Signed-off-by: default avatarTomasz Nowicki <tomasz.nowicki@linaro.org>
Signed-off-by: default avatarRobert Richter <rrichter@cavium.com>
Signed-off-by: default avatarDavid Daney <david.daney@cavium.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent de387e11

drivers/net/ethernet/cavium/thunder/thunder_bgx.c

+85 −1
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ 
 * as published by the Free Software Foundation.

 */



#include <linux/acpi.h>

#include <linux/module.h>

#include <linux/interrupt.h>

#include <linux/pci.h>
@@ -26,7 +27,7 @@ 
struct lmac {

	struct bgx		*bgx;

	int			dmac;

	unsigned char		mac[ETH_ALEN];

	u8			mac[ETH_ALEN];

	bool			link_up;

	int			lmacid; /* ID within BGX */

	int			lmacid_bd; /* ID on board */
@@ -835,6 +836,86 @@ static void bgx_get_qlm_mode(struct bgx *bgx) 
	}

}



#ifdef CONFIG_ACPI



static int acpi_get_mac_address(struct acpi_device *adev, u8 *dst)

{

	u8 mac[ETH_ALEN];

	int ret;



	ret = fwnode_property_read_u8_array(acpi_fwnode_handle(adev),

					    "mac-address", mac, ETH_ALEN);

	if (ret)

		goto out;



	if (!is_valid_ether_addr(mac)) {

		ret = -EINVAL;

		goto out;

	}



	memcpy(dst, mac, ETH_ALEN);

out:

	return ret;

}



/* Currently only sets the MAC address. */

static acpi_status bgx_acpi_register_phy(acpi_handle handle,

					 u32 lvl, void *context, void **rv)

{

	struct bgx *bgx = context;

	struct acpi_device *adev;



	if (acpi_bus_get_device(handle, &adev))

		goto out;



	acpi_get_mac_address(adev, bgx->lmac[bgx->lmac_count].mac);



	SET_NETDEV_DEV(&bgx->lmac[bgx->lmac_count].netdev, &bgx->pdev->dev);



	bgx->lmac[bgx->lmac_count].lmacid = bgx->lmac_count;

out:

	bgx->lmac_count++;

	return AE_OK;

}



static acpi_status bgx_acpi_match_id(acpi_handle handle, u32 lvl,

				     void *context, void **ret_val)

{

	struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL };

	struct bgx *bgx = context;

	char bgx_sel[5];



	snprintf(bgx_sel, 5, "BGX%d", bgx->bgx_id);

	if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &string))) {

		pr_warn("Invalid link device\n");

		return AE_OK;

	}



	if (strncmp(string.pointer, bgx_sel, 4))

		return AE_OK;



	acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,

			    bgx_acpi_register_phy, NULL, bgx, NULL);



	kfree(string.pointer);

	return AE_CTRL_TERMINATE;

}



static int bgx_init_acpi_phy(struct bgx *bgx)

{

	acpi_get_devices(NULL, bgx_acpi_match_id, bgx, (void **)NULL);

	return 0;

}



#else



static int bgx_init_acpi_phy(struct bgx *bgx)

{

	return -ENODEV;

}



#endif /* CONFIG_ACPI */



#if IS_ENABLED(CONFIG_OF_MDIO)



static int bgx_init_of_phy(struct bgx *bgx)
@@ -882,6 +963,9 @@ static int bgx_init_of_phy(struct bgx *bgx) 


static int bgx_init_phy(struct bgx *bgx)

{

	if (!acpi_disabled)

		return bgx_init_acpi_phy(bgx);



	return bgx_init_of_phy(bgx);

}