ichspi: Add support for Meteor Lake

This patch adds Meteor Lake support into flashrom.

Additionally, utilize CSSO (CPU Soft Strap Offset) to uniquely detect
the chipset when the CSSL (CPU Soft Strap Length) field default value
(0x03) on Meteor Lake is the same as Elkhart Lake.

BUG=b:224325352
TEST=Flashrom is able to detect MTL SPI DID and show chipset name as below:
> flashrom --flash-name
....
Found chipset "Intel Meteor Lake-P/M".
....

> flashrom - internal --ifd -i fd -i bios -r /tmp/bios.rom
....
Reading ich_descriptor... done.
Assuming chipset 'Meteor Lake'.
Using regions: "bios", "fd".
Reading flash... done.
SUCCESS

Signed-off-by: Subrata Banik <subratabanik@google.com>
Change-Id: I0a2ffe2ba8d96c90d89b77e0d8583d179ff02a75
Reviewed-on: https://review.coreboot.org/c/flashrom/+/62783
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
Reviewed-by: Wonkyu Kim <wonkyu.kim@intel.com>
Reviewed-by: Sam McNally <sammc@google.com>

1 files changed, 17 insertions, 4 deletions

diff --git a/ich_descriptors.c b/ich_descriptors.c
index 256224d8e..7c03499d3 100644
--- a/ich_descriptors.c
+++ b/ich_descriptors.c
@@ -47,6 +47,7 @@ ssize_t ich_number_of_regions(const enum ich_chipset cs, const struct ich_desc_c
 	case CHIPSET_400_SERIES_COMET_POINT:
 	case CHIPSET_500_SERIES_TIGER_POINT:
 	case CHIPSET_600_SERIES_ALDER_POINT:
+	case CHIPSET_METEOR_LAKE:
 	case CHIPSET_ELKHART_LAKE:
 		return 16;
 	case CHIPSET_100_SERIES_SUNRISE_POINT:
@@ -74,6 +75,7 @@ ssize_t ich_number_of_masters(const enum ich_chipset cs, const struct ich_desc_c
 	case CHIPSET_C620_SERIES_LEWISBURG:
 	case CHIPSET_APOLLO_LAKE:
 	case CHIPSET_600_SERIES_ALDER_POINT:
+	case CHIPSET_METEOR_LAKE:
 	case CHIPSET_GEMINI_LAKE:
 	case CHIPSET_ELKHART_LAKE:
 		if (cont->NM <= MAX_NUM_MASTERS)
@@ -113,7 +115,7 @@ void prettyprint_ich_chipset(enum ich_chipset cs)
 		"8 series Lynx Point", "Baytrail", "8 series Lynx Point LP", "8 series Wellsburg",
 		"9 series Wildcat Point", "9 series Wildcat Point LP", "100 series Sunrise Point",
 		"C620 series Lewisburg", "300 series Cannon Point", "400 series Comet Point",
-		"500 series Tiger Point", "600 series Alder Point", "Apollo Lake", "Gemini Lake", "Elkhart Lake",
+		"500 series Tiger Point", "600 series Alder Point", "Meteor Lake", "Apollo Lake", "Gemini Lake", "Elkhart Lake",
 	};
 	if (cs < CHIPSET_ICH8 || cs - CHIPSET_ICH8 + 1 >= ARRAY_SIZE(chipset_names))
 		cs = 0;
@@ -209,6 +211,7 @@ static const char *pprint_density(enum ich_chipset cs, const struct ich_descript
 	case CHIPSET_400_SERIES_COMET_POINT:
 	case CHIPSET_500_SERIES_TIGER_POINT:
 	case CHIPSET_600_SERIES_ALDER_POINT:
+	case CHIPSET_METEOR_LAKE:
 	case CHIPSET_APOLLO_LAKE:
 	case CHIPSET_GEMINI_LAKE:
 	case CHIPSET_ELKHART_LAKE: {
@@ -304,6 +307,7 @@ static const char *pprint_freq(enum ich_chipset cs, uint8_t value)
 		return freq_str[2][value];
 	case CHIPSET_500_SERIES_TIGER_POINT:
 	case CHIPSET_600_SERIES_ALDER_POINT:
+	case CHIPSET_METEOR_LAKE:
 		return freq_str[3][value];
 	case CHIPSET_ELKHART_LAKE:
 		return freq_str[4][value];
@@ -351,6 +355,7 @@ void prettyprint_ich_descriptor_component(enum ich_chipset cs, const struct ich_
 	case CHIPSET_400_SERIES_COMET_POINT:
 	case CHIPSET_500_SERIES_TIGER_POINT:
 	case CHIPSET_600_SERIES_ALDER_POINT:
+	case CHIPSET_METEOR_LAKE:
 	case CHIPSET_APOLLO_LAKE:
 	case CHIPSET_GEMINI_LAKE:
 	case CHIPSET_ELKHART_LAKE:
@@ -476,7 +481,8 @@ void prettyprint_ich_descriptor_master(const enum ich_chipset cs, const struct i
 	    cs == CHIPSET_300_SERIES_CANNON_POINT ||
 	    cs == CHIPSET_400_SERIES_COMET_POINT ||
 	    cs == CHIPSET_500_SERIES_TIGER_POINT ||
-	    cs == CHIPSET_600_SERIES_ALDER_POINT) {
+	    cs == CHIPSET_600_SERIES_ALDER_POINT ||
+	    cs == CHIPSET_METEOR_LAKE) {
 		const char *const master_names[] = {
 			"BIOS", "ME", "GbE", "unknown", "EC",
 		};
@@ -1039,8 +1045,12 @@ static enum ich_chipset guess_ich_chipset_from_content(const struct ich_desc_con
 			return CHIPSET_500_SERIES_TIGER_POINT;
 		if (content->CSSL == 0x14)
 			return CHIPSET_600_SERIES_ALDER_POINT;
-		if (content->CSSL == 0x03)
-			return CHIPSET_ELKHART_LAKE;
+		if (content->CSSL == 0x03) {
+			if (content->CSSO == 0x70)
+				return CHIPSET_METEOR_LAKE;
+			else
+				return CHIPSET_ELKHART_LAKE;
+		}
 		msg_pwarn("Unknown flash descriptor, assuming 500 series compatibility.\n");
 		return CHIPSET_500_SERIES_TIGER_POINT;
 	}
@@ -1063,6 +1073,7 @@ static enum ich_chipset guess_ich_chipset(const struct ich_desc_content *const c
 	case CHIPSET_400_SERIES_COMET_POINT:
 	case CHIPSET_500_SERIES_TIGER_POINT:
 	case CHIPSET_600_SERIES_ALDER_POINT:
+	case CHIPSET_METEOR_LAKE:
 	case CHIPSET_GEMINI_LAKE:
 	case CHIPSET_ELKHART_LAKE:
 		/* `freq_read` was repurposed, so can't check on it any more. */
@@ -1220,6 +1231,7 @@ int getFCBA_component_density(enum ich_chipset cs, const struct ich_descriptors
 	case CHIPSET_400_SERIES_COMET_POINT:
 	case CHIPSET_500_SERIES_TIGER_POINT:
 	case CHIPSET_600_SERIES_ALDER_POINT:
+	case CHIPSET_METEOR_LAKE:
 	case CHIPSET_APOLLO_LAKE:
 	case CHIPSET_GEMINI_LAKE:
 	case CHIPSET_ELKHART_LAKE:
@@ -1260,6 +1272,7 @@ static uint32_t read_descriptor_reg(enum ich_chipset cs, uint8_t section, uint16
 	case CHIPSET_400_SERIES_COMET_POINT:
 	case CHIPSET_500_SERIES_TIGER_POINT:
 	case CHIPSET_600_SERIES_ALDER_POINT:
+	case CHIPSET_METEOR_LAKE:
 	case CHIPSET_APOLLO_LAKE:
 	case CHIPSET_GEMINI_LAKE:
 	case CHIPSET_ELKHART_LAKE: