New patch to review for coreboot: 3a05bed broadwell: Add reporting of broadwell MCH revision

[Stefan Reinauer]

Stefan Reinauer ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/9228

-gerrit

commit 3a05bed85c91d8bb3e03b2c84372e83315d9cc2b
Author: Duncan Laurie 
Date:   Tue Oct 14 08:37:18 2014 -0700

broadwell: Add reporting of broadwell MCH revision

Since the E0 and F0 stepping parts have the same CPUID it is
    necessary to use the MCH PCI device revision to determine what
    the actual stepping is.

Add this decode table so the early output gives proper identification
    of the installed CPU type.

BUG=chrome-os-partner:32359
    BRANCH=samus,auron
    TEST=build and boot on samus with E0 and F0 parts

Change-Id: Idce1e289cd958c77febc87395f27570247512a87
    Signed-off-by: Stefan Reinauer 
    Original-Commit-Id: a5346141e45b105a35a7641f60b29e02ab2bdfa3
    Original-Change-Id: I1bc127badd75ecc34d3d2dbae5d272bd4d9f9082
    Original-Signed-off-by: Duncan Laurie 
    Original-Reviewed-on: https://chromium-review.googlesource.com/223158
    Original-Reviewed-by: Aaron Durbin 
---
 src/soc/intel/broadwell/broadwell/systemagent.h    |  5 +++
 src/soc/intel/broadwell/romstage/report_platform.c | 37 ++++++++++++++++++++--
 2 files changed, 39 insertions(+), 3 deletions(-)

diff --git a/src/soc/intel/broadwell/broadwell/systemagent.h b/src/soc/intel/broadwell/broadwell/systemagent.h
index c3b5f94..61ea56a 100644
--- a/src/soc/intel/broadwell/broadwell/systemagent.h
+++ b/src/soc/intel/broadwell/broadwell/systemagent.h
@@ -36,6 +36,11 @@
 #define IGD_BROADWELL_H_GT2	0x1612
 #define IGD_BROADWELL_H_GT3	0x1622

+#define MCH_BROADWELL_ID_U_Y	0x1604
+#define MCH_BROADWELL_REV_D0	0x06
+#define MCH_BROADWELL_REV_E0	0x08
+#define MCH_BROADWELL_REV_F0	0x09
+
 /* Device 0:0.0 PCI configuration space */

#define EPBAR		0x40
diff --git a/src/soc/intel/broadwell/romstage/report_platform.c b/src/soc/intel/broadwell/romstage/report_platform.c
index d435564..84273e4 100644
--- a/src/soc/intel/broadwell/romstage/report_platform.c
+++ b/src/soc/intel/broadwell/romstage/report_platform.c
@@ -32,7 +32,7 @@
 static struct {
    u32 cpuid;
    const char *name;
-} cpu_table [] = {
+} cpu_table[] = {
    { CPUID_HASWELL_A0,     "Haswell A0" },
    { CPUID_HASWELL_B0,     "Haswell B0" },
    { CPUID_HASWELL_C0,     "Haswell C0" },
@@ -45,9 +45,18 @@ static struct {
 };

static struct {
+	u8 revid;
+	const char *name;
+} mch_rev_table[] = {
+	{ MCH_BROADWELL_REV_D0, "Broadwell D0" },
+	{ MCH_BROADWELL_REV_E0, "Broadwell E0" },
+	{ MCH_BROADWELL_REV_F0, "Broadwell F0" },
+};
+
+static struct {
    u16 lpcid;
    const char *name;
-} pch_table [] = {
+} pch_table[] = {
    { PCH_LPT_LP_SAMPLE,     "LynxPoint LP Sample" },
    { PCH_LPT_LP_PREMIUM,    "LynxPoint LP Premium" },
    { PCH_LPT_LP_MAINSTREAM, "LynxPoint LP Mainstream" },
@@ -65,7 +74,7 @@ static struct {
 static struct {
    u16 igdid;
    const char *name;
-} igd_table [] = {
+} igd_table[] = {
    { IGD_HASWELL_ULT_GT1,     "Haswell ULT GT1" },
    { IGD_HASWELL_ULT_GT2,     "Haswell ULT GT2" },
    { IGD_HASWELL_ULT_GT3,     "Haswell ULT GT3" },
@@ -131,6 +140,27 @@ static void report_cpu_info(void)
           "VT %ssupported\n", mode[aes], mode[txt], mode[vt]);
 }

+static void report_mch_info(void)
+{
+	int i;
+	u16 mch_device = pci_read_config16(SA_DEV_ROOT, PCI_DEVICE_ID);
+	u8 mch_revision = pci_read_config8(SA_DEV_ROOT, PCI_REVISION_ID);
+	const char *mch_type = "Unknown";
+
+	/* Look for string to match the revision for Broadwell U/Y */
+	if (mch_device == MCH_BROADWELL_ID_U_Y) {
+		for (i = 0; i < ARRAY_SIZE(mch_rev_table); i++) {
+			if (mch_rev_table[i].revid == mch_revision) {
+				mch_type = mch_rev_table[i].name;
+				break;
+			}
+		}
+	}
+
+	printk(BIOS_DEBUG, "MCH: device id %04x (rev %02x) is %s\n",
+	       mch_device, mch_revision, mch_type);
+}
+
 static void report_pch_info(void)
 {
    int i;
@@ -166,6 +196,7 @@ static void report_igd_info(void)
 void report_platform_info(void)
 {
    report_cpu_info();
+	report_mch_info();
    report_pch_info();
    report_igd_info();
 }