Change in flashrom[stable]: sb600spi: Add support for Merlin Falcon Chipset

[Nico Huber (Code Review)]

Nico Huber has uploaded this change for review. ( https://review.coreboot.org/21937

Change subject: sb600spi: Add support for Merlin Falcon Chipset
......................................................................

sb600spi: Add support for Merlin Falcon Chipset

This patch has been tested on a board similar to AMD Bettong.

00:14.0 SMBus [0c05]: Advanced Micro Devices, Inc. [AMD] FCH SMBus
Controller [1022:790b] (rev 4a)
00:14.3 ISA bridge [0601]: Advanced Micro Devices, Inc. [AMD] FCH LPC
Bridge [1022:790e] (rev 11)
root@qt5022-fglrx:~# ./flashrom -p internal -w kk.rom

flashrom v0.9.9-unknown on Linux 4.10.0-qtec-standard (x86_64)
flashrom is free software, get the source code at
https://flashrom.org

Calibrating delay loop... OK.
coreboot table found at 0x9ffd6000.
Found chipset "AMD FP4".
Enabling flash write... OK.
Found Micron/Numonyx/ST flash chip "N25Q128..1E" (16384 kB, SPI)
mapped at physical address 0x00000000ff000000.
Reading old flash chip contents... done.
Erasing and writing flash chip... Erase/write done.
Verifying flash... VERIFIED.

Original-Change-Id: I66a240ebc8382cc7e5156686045aee1a9d03fe6d
Original-Reviewed-on: https://review.coreboot.org/21429
Original-Tested-by: build bot (Jenkins) 
Original-Reviewed-by: David Hendricks

Change-Id: I44e55fe9bdb5ac00ed118d1d3cdc2c80b5e997cf
Signed-off-by: Ricardo Ribalda Delgado 
---
M chipset_enable.c
M sb600spi.c
2 files changed, 24 insertions(+), 5 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/37/21937/1

diff --git a/chipset_enable.c b/chipset_enable.c
index a3b7f8d..3437792 100644
--- a/chipset_enable.c
+++ b/chipset_enable.c
@@ -1608,6 +1608,7 @@
    {0x1022, 0x7440, OK,  "AMD", "AMD-768",				enable_flash_amd_768_8111},
    {0x1022, 0x7468, OK,  "AMD", "AMD-8111",			enable_flash_amd_768_8111},
    {0x1022, 0x780e, OK,  "AMD", "FCH",				enable_flash_sb600},
+	{0x1022, 0x790e, OK,  "AMD", "FP4",				enable_flash_sb600},
    {0x1039, 0x0406, NT,  "SiS", "501/5101/5501",			enable_flash_sis501},
    {0x1039, 0x0496, NT,  "SiS", "85C496+497",			enable_flash_sis85c496},
    {0x1039, 0x0530, OK,  "SiS", "530",				enable_flash_sis530},
diff --git a/sb600spi.c b/sb600spi.c
index 6bd5679..68f8d8a 100644
--- a/sb600spi.c
+++ b/sb600spi.c
@@ -149,6 +149,23 @@
    			  "Please report this to [e-mail] and include this log and\n"
    			  "the output of lspci -nnvx, thanks!.\n", rev);
    	}
+	} else if (dev->device_id == 0x790e) {
+		struct pci_dev *smbus_dev = pci_dev_find(0x1022, 0x790B);
+		if (smbus_dev == NULL) {
+			msg_pdbg("No SMBus device with ID 1022:790B found.\n");
+			return;
+		}
+		uint8_t rev = pci_read_byte(smbus_dev, PCI_REVISION_ID);
+		if (rev == 0x4a) {
+			amd_gen = CHIPSET_YANGTZE;
+			msg_pdbg("Yangtze detected.\n");
+		} else {
+			msg_pwarn("FCH device found but SMBus revision 0x%02x does not match known values.\n"
+				  "Please report this to [e-mail] and include this log and\n"
+				  "the output of lspci -nnvx, thanks!.\n", rev);
+		}
+
+
 #endif
    } else
    	msg_pwarn("%s: Unknown LPC device %" PRIx16 ":%" PRIx16 ".\n"
@@ -646,12 +663,13 @@

/* Look for the SMBus device. */
    smbus_dev = pci_dev_find(0x1002, 0x4385);
-	if (!smbus_dev) {
+	if (!smbus_dev)
    	smbus_dev = pci_dev_find(0x1022, 0x780b); /* AMD FCH */
-		if (!smbus_dev) {
-			msg_perr("ERROR: SMBus device not found. Not enabling SPI.\n");
-			return ERROR_NONFATAL;
-		}
+	if (!smbus_dev)
+		smbus_dev = pci_dev_find(0x1022, 0x790b); /* AMD FP4 */
+	if (!smbus_dev) {
+		msg_perr("ERROR: SMBus device not found. Not enabling SPI.\n");
+		return ERROR_NONFATAL;
    }

/* Note about the bit tests below: If a bit is zero, the GPIO is SPI. */