soc/intel/apollolake: Add check if FPFs are blown

Apollolake platform comes with FPF (field-programmable-fuses). FPF can
be blown only once, typically at the end of the manufacturing process.
This patch adds code that sends a request to CSE to figure out if FPFs
have already been blown.

Change-Id: I9e768a8b95a3cb48adf66e1f17803c720908802d
Signed-off-by: Andrey Petrov <andrey.petrov@intel.com>
Reviewed-on: https://review.coreboot.org/18604
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)
This commit is contained in:
Andrey Petrov 2017-03-03 08:12:36 -08:00 committed by Martin Roth
parent d8db26d6e7
commit b1aded2f0c
1 changed files with 116 additions and 1 deletions

View File

@ -16,6 +16,7 @@
#include <arch/io.h>
#include <bootstate.h>
#include <console/console.h>
#include <intelblocks/cse.h>
#include <soc/pci_devs.h>
#include <stdint.h>
@ -26,6 +27,106 @@
#define PCI_ME_HFSTS5 0x68
#define PCI_ME_HFSTS6 0x6c
#define MKHI_GROUP_ID_MCA 0x0a
#define READ_FILE 0x02
#define READ_FILE_FLAG_DEFAULT (1 << 0)
#define READ_FILE_FLAG_HASH (1 << 1)
#define READ_FILE_FLAG_EMULATED (1 << 2)
#define READ_FILE_FLAG_HW (1 << 3)
#define MCA_MAX_FILE_PATH_SIZE 64
#define FUSE_LOCK_FILE "/fpf/intel/SocCfgLock"
static int8_t g_fuse_status;
/*
* Read file from CSE internal filesystem.
* size is maximum length of provided buffer buff, which is updated with actual
* size of the file read. flags indicate whether real file or fuse is used.
* Returns 1 on success and 0 otherwise.
*/
static int read_cse_file(const char *path, void *buff, size_t *size,
size_t offset, uint32_t flags)
{
int res;
size_t reply_size;
union mkhi_header {
uint32_t data;
struct {
uint32_t group_id: 8;
uint32_t command: 7;
uint32_t is_response: 1;
uint32_t reserved: 8;
uint32_t result: 8;
} __attribute__ ((packed)) fields;
};
struct mca_command {
union mkhi_header mkhi_hdr;
char file_name[MCA_MAX_FILE_PATH_SIZE];
uint32_t offset;
uint32_t data_size;
uint8_t flags;
} __attribute__ ((packed)) msg;
struct mca_response {
union mkhi_header mkhi_hdr;
uint32_t data_size;
uint8_t buffer[128];
} __attribute__ ((packed)) rmsg;
if (sizeof(rmsg.buffer) < *size) {
printk(BIOS_ERR, "internal buffer is too small\n");
return 0;
}
strncpy(msg.file_name, path, sizeof(msg.file_name));
msg.mkhi_hdr.fields.group_id = MKHI_GROUP_ID_MCA;
msg.mkhi_hdr.fields.command = READ_FILE;
msg.flags = flags;
msg.data_size = *size;
msg.offset = offset;
res = heci_send(&msg, sizeof(msg), BIOS_HOST_ADDR, HECI_MKHI_ADDR);
if (!res) {
printk(BIOS_ERR, "failed to send HECI message\n");
return 0;
}
reply_size = sizeof(rmsg);
res = heci_receive(&rmsg, &reply_size);
if (!res) {
printk(BIOS_ERR, "failed to receive HECI reply\n");
return 0;
}
if (rmsg.data_size > *size) {
printk(BIOS_ERR, "reply is too large\n");
return 0;
}
memcpy(buff, rmsg.buffer, rmsg.data_size);
*size = rmsg.data_size;
return 1;
}
static void fpf_blown(void *unused)
{
int8_t fuse;
size_t sz = sizeof(fuse);
if (read_cse_file(FUSE_LOCK_FILE, &fuse, &sz, 0, READ_FILE_FLAG_HW)) {
g_fuse_status = fuse;
return;
}
g_fuse_status = -1;
}
static uint32_t dump_status(int index, int reg_addr)
{
uint32_t reg = pci_read_config32(HECI1_DEV, reg_addr);
@ -51,7 +152,21 @@ static void dump_cse_state(void *unused)
the product so it's called out explicitly. */
printk(BIOS_DEBUG, "ME: Manufacturing Mode : %s\n",
(fwsts1 & (1 << 0x4)) ? "YES" : "NO");
}
printk(BIOS_DEBUG, "ME: FPF status : ");
switch (g_fuse_status) {
case 0:
printk(BIOS_DEBUG, "unfused");
break;
case 1:
printk(BIOS_DEBUG, "fused");
break;
default:
case -1:
printk(BIOS_DEBUG, "unknown");
}
printk(BIOS_DEBUG, "\n");
}
BOOT_STATE_INIT_ENTRY(BS_DEV_INIT, BS_ON_ENTRY, fpf_blown, NULL);
BOOT_STATE_INIT_ENTRY(BS_OS_RESUME, BS_ON_ENTRY, dump_cse_state, NULL);
BOOT_STATE_INIT_ENTRY(BS_PAYLOAD_LOAD, BS_ON_EXIT, dump_cse_state, NULL);