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-rw-r--r--src/soc/intel/common/block/cse/cse.c48
-rw-r--r--src/soc/intel/common/block/include/intelblocks/cse.h16
2 files changed, 47 insertions, 17 deletions
diff --git a/src/soc/intel/common/block/cse/cse.c b/src/soc/intel/common/block/cse/cse.c
index c9712dbb2c..041656a498 100644
--- a/src/soc/intel/common/block/cse/cse.c
+++ b/src/soc/intel/common/block/cse/cse.c
@@ -650,6 +650,26 @@ int cse_request_global_reset(enum rst_req_type rst_type)
return status;
}
+static bool cse_is_hmrfpo_enable_allowed(void)
+{
+ /*
+ * Allow sending HMRFPO ENABLE command only if:
+ * - CSE's current working state is Normal and current operation mode is Normal
+ * - (or) cse's current working state is normal and current operation mode is
+ * Soft Temp Disable if CSE's Firmware SKU is Custom
+ */
+ if (!cse_is_hfs1_cws_normal())
+ return false;
+
+ if (cse_is_hfs1_com_normal())
+ return true;
+
+ if (cse_is_hfs3_fw_sku_custom() && cse_is_hfs1_com_soft_temp_disable())
+ return true;
+
+ return false;
+}
+
/* Sends HMRFPO Enable command to CSE */
int cse_hmrfpo_enable(void)
{
@@ -675,36 +695,34 @@ int cse_hmrfpo_enable(void)
/* Length of factory data area, not relevant for client SKUs */
uint32_t fct_limit;
uint8_t status;
- uint8_t padding[3];
+ uint8_t reserved[3];
} __packed;
struct hmrfpo_enable_resp resp;
size_t resp_size = sizeof(struct hmrfpo_enable_resp);
printk(BIOS_DEBUG, "HECI: Send HMRFPO Enable Command\n");
- /*
- * This command can be run only if:
- * - Working state is normal and
- * - Operation mode is normal or temporary disable mode.
- */
- if (!cse_is_hfs1_cws_normal() ||
- (!cse_is_hfs1_com_normal() && !cse_is_hfs1_com_soft_temp_disable())) {
- printk(BIOS_ERR, "HECI: ME not in required Mode\n");
- goto failed;
+
+ if (!cse_is_hmrfpo_enable_allowed()) {
+ printk(BIOS_ERR, "HECI: CSE does not meet required prerequisites\n");
+ return 0;
}
if (!heci_send_receive(&msg, sizeof(struct hmrfpo_enable_msg),
&resp, &resp_size))
- goto failed;
+ return 0;
if (resp.hdr.result) {
printk(BIOS_ERR, "HECI: Resp Failed:%d\n", resp.hdr.result);
- goto failed;
+ return 0;
}
- return 1;
-failed:
- return 0;
+ if (resp.status) {
+ printk(BIOS_ERR, "HECI: HMRFPO_Enable Failed (resp status: %d)\n", resp.status);
+ return 0;
+ }
+
+ return 1;
}
/*
diff --git a/src/soc/intel/common/block/include/intelblocks/cse.h b/src/soc/intel/common/block/include/intelblocks/cse.h
index 93d1ce1d04..595c7d8d6b 100644
--- a/src/soc/intel/common/block/include/intelblocks/cse.h
+++ b/src/soc/intel/common/block/include/intelblocks/cse.h
@@ -136,8 +136,20 @@ enum rst_req_type {
int cse_request_global_reset(enum rst_req_type rst_type);
/*
- * Send HMRFPO_ENABLE command.
- * returns 0 on failure and 1 on success.
+ * Sends HMRFPO_ENABLE command.
+ * HMRFPO - Host ME Region Flash Protection Override.
+ * For CSE Firmware SKU Custom, procedure to place CSE in HMRFPO (SECOVER_MEI_MSG) mode:
+ * 1. Ensure CSE boots from BP1(RO).
+ * - Send set_next_boot_partition(BP1)
+ * - Issue CSE Only Reset
+ * 2. Send HMRFPO_ENABLE command to CSE. Further, no reset is required.
+ *
+ * The HMRFPO mode prevents CSE to execute SPI I/O cycles to CSE region, and unlocks
+ * the CSE region to perform updates to it.
+ * This command is only valid before EOP.
+ *
+ * Returns 0 on failure to send HECI command and to enable HMRFPO mode, and 1 on success.
+ *
*/
int cse_hmrfpo_enable(void);