soc/intel/common/block/cse: Prevent HECI commands when flash descriptor override is set

Sending the disable and EOP commands will not work if flash descriptor
override is set on Meteor Lake.

Change-Id: I3b5a56229434c9cc326141d48359faa7759541ee
Signed-off-by: Jeremy Soller <Jeremy@system76.com>
Signed-off-by: Tim Crawford <tcrawford@system76.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/82728
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Michał Kopeć <michal.kopec@3mdeb.com>

src/soc/intel/common/block/cse/cse.c

@@ -11,6 +11,7 @@
 #include <device/pci_ids.h>
 #include <device/pci_ops.h>
 #include <intelblocks/cse.h>
+#include <intelblocks/fast_spi.h>
 #include <intelblocks/me.h>
 #include <intelblocks/pmclib.h>
 #include <intelblocks/post_codes.h>
@@ -1348,6 +1349,13 @@ static void cse_set_state(struct device *dev)
 
 	int send;
 	int result;
+
+	if (fast_spi_flash_descriptor_override()) {
+		printk(BIOS_WARNING, "HECI: not setting ME state because "
+			"flash descriptor override is enabled\n");
+		return;
+	}
+
 	/*
 	 * Check if the CMOS value "me_state" exists, if it doesn't, then
 	 * don't do anything.

src/soc/intel/common/block/cse/cse_eop.c

@@ -4,6 +4,7 @@
 #include <bootstate.h>
 #include <console/console.h>
 #include <intelblocks/cse.h>
+#include <intelblocks/fast_spi.h>
 #include <intelblocks/pmc_ipc.h>
 #include <security/vboot/vboot_common.h>
 #include <soc/intel/common/reset.h>
@@ -243,6 +244,11 @@ static void do_send_end_of_post(bool wait_for_completion)
 		return;
 	}
 
+	if (fast_spi_flash_descriptor_override()) {
+		printk(BIOS_WARNING, "CSE: not sending EOP because flash descriptor override is enabled\n");
+		return;
+	}
+
 	if (!eop_sent) {
 		set_cse_device_state(PCH_DEVFN_CSE, DEV_ACTIVE);
 		timestamp_add_now(TS_ME_END_OF_POST_START);

src/soc/intel/common/block/fast_spi/fast_spi.c

@@ -472,6 +472,15 @@ void fast_spi_clear_outstanding_status(void)
 	write32(spibar + SPIBAR_HSFSTS_CTL, SPIBAR_HSFSTS_W1C_BITS);
 }
 
+/* Check if flash descriptor override is asserted */
+bool fast_spi_flash_descriptor_override(void)
+{
+	void *spibar = fast_spi_get_bar();
+	uint32_t hsfsts = read32(spibar + SPIBAR_HSFSTS_CTL);
+	printk(BIOS_DEBUG, "HSFSTS: 0x%X\n", hsfsts);
+	return !(hsfsts & SPIBAR_HSFSTS_FDOPSS);
+}
+
 
 /* As there is no official ACPI ID for this controller use the generic PNP ID for now. */
 static const char *fast_spi_acpi_hid(const struct device *dev)

src/soc/intel/common/block/include/intelblocks/fast_spi.h

@@ -107,5 +107,9 @@ void fast_spi_cache_ext_bios_postcar(struct postcar_frame *pcf);
  * Set FAST_SPIBAR BIOS Decode Lock bit
  */
 void fast_spi_set_bde(void);
+/*
+ * Check if flash descriptor override is asserted
+ */
+bool fast_spi_flash_descriptor_override(void);
 
 #endif	/* SOC_INTEL_COMMON_BLOCK_FAST_SPI_H */