Add Intel Tunnel Creek chipset support, mark it as tested

Intel's Tunnel Creek chipset supports both an SPI and an LPC bus. Set the
chipset table entry for Tunnel Creek to the new function
enable_flash_tunnelcreek(), which will read the hardware straps and return
support for the bus that has been used for booting. This function uses
ich_init_spi() with ich_generation set to 7 for initializing the SPI bus
if necessary.

SPI functionality tested on actual hardware, Tunnel Creek LPC interface not
tested yet (missing hardware for that).

Log file / success report:
http://www.flashrom.org/pipermail/flashrom/2011-September/007823.html

Corresponding to flashrom svn r1430.

Signed-off-by: Ingo Feldschmid <ifel@msc-ge.com>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>

1 files changed, 45 insertions, 1 deletions

diff --git a/chipset_enable.c b/chipset_enable.c
index 1c3d644a2..d01371060 100644
--- a/chipset_enable.c
+++ b/chipset_enable.c
@@ -437,6 +437,50 @@ static int enable_flash_poulsbo(struct pci_dev *dev, const char *name)
 	return 0;
 }
 
+static int enable_flash_tunnelcreek(struct pci_dev *dev, const char *name)
+{
+	uint16_t old, new;
+	uint32_t tmp, bnt;
+	void *rcrb;
+	int ret;
+
+	/* Enable Flash Writes */
+	ret = enable_flash_ich(dev, name, 0xd8);
+	if (ret == ERROR_FATAL)
+		return ret;
+
+	/* Make sure BIOS prefetch mechanism is disabled */
+	old = pci_read_byte(dev, 0xd9);
+	msg_pdbg("BIOS Prefetch Enable: %sabled, ", (old & 1) ? "en" : "dis");
+	new = old & ~1;
+	if (new != old)
+		rpci_write_byte(dev, 0xd9, new);
+
+	/* Get physical address of Root Complex Register Block */
+	tmp = pci_read_long(dev, 0xf0) & 0xffffc000;
+	msg_pdbg("\nRoot Complex Register Block address = 0x%x\n", tmp);
+
+	/* Map RCBA to virtual memory */
+	rcrb = physmap("ICH RCRB", tmp, 0x4000);
+
+	/* Test Boot BIOS Strap Status */
+	bnt = mmio_readl(rcrb + 0x3410);
+	if (bnt & 0x02) {
+		/* If strapped to LPC, no SPI initialization is required */
+		buses_supported = BUS_FWH;
+		return 0;
+	}
+
+	/* This adds BUS_SPI */
+	buses_supported = BUS_SPI;
+	if (ich_init_spi(dev, tmp, rcrb, 7) != 0) {
+		if (!ret)
+			ret = ERROR_NONFATAL;
+	}
+
+	return ret;
+}
+
 static int enable_flash_vt8237s_spi(struct pci_dev *dev, const char *name)
 {
 	/* Do we really need no write enable? */
@@ -1268,7 +1312,7 @@ const struct penable chipset_enables[] = {
 	{0x8086, 0x7110, OK, "Intel", "PIIX4/4E/4M",	enable_flash_piix4},
 	{0x8086, 0x7198, OK, "Intel", "440MX",		enable_flash_piix4},
 	{0x8086, 0x8119, OK, "Intel", "SCH Poulsbo",	enable_flash_poulsbo},
-	{0x8086, 0x8186, NT, "Intel", "Atom E6xx(T)/Tunnel Creek", enable_flash_poulsbo},
+	{0x8086, 0x8186, OK, "Intel", "Atom E6xx(T)/Tunnel Creek", enable_flash_tunnelcreek},
 #endif
 	{},
 };