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ARM: rpi_b: query internal MAC address from firmware

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The built-in SMSC 95xx chip doesn't know its own MAC address. Instead,
we must query it from the VC firmware; it's probably encoded in fuses
on the BCM2835.

Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
This commit is contained in:
Stephen Warren 2014-09-26 20:51:39 -06:00 committed by Marek Vasut
parent 72d5702c44
commit 4f80a06df3
3 changed files with 44 additions and 0 deletions
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14
arch/arm/include/asm/arch-bcm2835/mbox.h
View file

@ -119,6 +119,20 @@ struct bcm2835_mbox_tag_hdr {
* };
*/
#define BCM2835_MBOX_TAG_GET_MAC_ADDRESS 0x00010003
struct bcm2835_mbox_tag_get_mac_address {
struct bcm2835_mbox_tag_hdr tag_hdr;
union {
struct {
} req;
struct {
u8 mac[6];
u8 pad[2];
} resp;
} body;
};
#define BCM2835_MBOX_TAG_GET_ARM_MEMORY 0x00010005
struct bcm2835_mbox_tag_get_arm_mem {

29
board/raspberrypi/rpi_b/rpi_b.c
View file

@ -31,6 +31,12 @@ struct msg_get_arm_mem {
u32 end_tag;
};
struct msg_get_mac_address {
struct bcm2835_mbox_hdr hdr;
struct bcm2835_mbox_tag_get_mac_address get_mac_address;
u32 end_tag;
};
struct msg_set_power_state {
struct bcm2835_mbox_hdr hdr;
struct bcm2835_mbox_tag_set_power_state set_power_state;
@ -62,6 +68,29 @@ int dram_init(void)
return 0;
}
int misc_init_r(void)
{
ALLOC_ALIGN_BUFFER(struct msg_get_mac_address, msg, 1, 16);
int ret;
if (getenv("usbethaddr"))
return 0;
BCM2835_MBOX_INIT_HDR(msg);
BCM2835_MBOX_INIT_TAG(&msg->get_mac_address, GET_MAC_ADDRESS);
ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr);
if (ret) {
printf("bcm2835: Could not query MAC address\n");
/* Ignore error; not critical */
return 0;
}
eth_setenv_enetaddr("usbethaddr", msg->get_mac_address.body.resp.mac);
return 0;
}
static int power_on_module(u32 module)
{
ALLOC_ALIGN_BUFFER(struct msg_set_power_state, msg_pwr, 1, 16);

1
include/configs/rpi_b.h
View file

@ -182,6 +182,7 @@
#define CONFIG_USB_STORAGE
#define CONFIG_USB_HOST_ETHER
#define CONFIG_USB_ETHER_SMSC95XX
#define CONFIG_MISC_INIT_R
#endif
#endif