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authorAndrey Petrov <andrey.petrov@intel.com>2017-03-03 08:12:36 -0800
committerMartin Roth <martinroth@google.com>2017-03-09 04:41:44 +0100
commitb1aded2f0ca2225d4363bec2e206e7c955df70c2 (patch)
treebdab07f8e9a27281a7cd4fd96825e7267efaa6c5 /src/soc/intel
parentd8db26d6e7e624a34add84f679c40badc35cf8e0 (diff)
downloadcoreboot-b1aded2f0ca2225d4363bec2e206e7c955df70c2.tar.xz
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)
Diffstat (limited to 'src/soc/intel')
-rw-r--r--src/soc/intel/apollolake/cse.c117
1 files changed, 116 insertions, 1 deletions
diff --git a/src/soc/intel/apollolake/cse.c b/src/soc/intel/apollolake/cse.c
index ba3898dad0..a8e3b5b97f 100644
--- a/src/soc/intel/apollolake/cse.c
+++ b/src/soc/intel/apollolake/cse.c
@@ -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);