New patch to review for filo: 6fe27d3 Add ICH9 SPI opcode locking to intel lockdown routine

[Patrick Georgi]

Patrick Georgi ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/2369

-gerrit

commit 6fe27d3febdc7678ebe2be501aa1cf7ef12cbb94
Author: Nico Huber 
Date:   Mon Oct 8 15:13:34 2012 +0200

Add ICH9 SPI opcode locking to intel lockdown routine

ICH9 SPI requires more lock down than mere FWH.

Change-Id: I91e417b72ac9e7c7da3ba9fd20eb0a86be2ce2a3
    Signed-off-by: Nico Huber 
---
 drivers/intel.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/intel.c b/drivers/intel.c
index ed20b11..62d23b5 100644
--- a/drivers/intel.c
+++ b/drivers/intel.c
@@ -43,11 +43,21 @@
 #define RCBA16(x) *((volatile u16 *)(DEFAULT_RCBA + x))
 #define RCBA32(x) *((volatile u32 *)(DEFAULT_RCBA + x))

+#define ICH9_SPI_HSFS		0x3804
+#define ICH9_SPI_HSFS_FLOCKDN	(1 << 15);
+#define ICH9_SPI_PREOP		0x3894
+#define ICH9_SPI_OPTYPE		0x3896
+#define ICH9_SPI_OPMENU		0x3898
+
+typedef enum {
+	ICH7, ICH9,
+} ich_t;

int intel_lockdown_flash(void)
 {
    u8 reg8;
    u32 reg32;
+	ich_t ich;

reg32 = pci_read_config32(PCI_DEV(0,0x1f, 0), 0);
    switch (reg32) {
@@ -56,6 +66,8 @@ int intel_lockdown_flash(void)
    case 0x27b88086:
    case 0x27b98086:
    case 0x27bd8086:
+		ich = ICH7;
+		break;
    	/* ICH9 */
    case 0x29128086:
    case 0x29148086:
@@ -63,6 +75,7 @@ int intel_lockdown_flash(void)
    case 0x29178086:
    case 0x29188086:
    case 0x29198086:
+		ich = ICH9;
    	break;
    default:
    	debug("Not an ICH7 or ICH9 southbridge\n");
@@ -85,6 +98,15 @@ int intel_lockdown_flash(void)
    reg32 |= 1;		/* BILD - BIOS Interface Lockdown */
    RCBA32(0x3410) = reg32; /* Set BUC.TS and GCS.BBS to RO */

+	/* Lock SPI interface with empty opcode registers on ICH9. */
+	if (ICH9 == ich) {
+		RCBA16(ICH9_SPI_PREOP)  = 0x0000;
+		RCBA16(ICH9_SPI_OPTYPE) = 0x0000;
+		RCBA32(ICH9_SPI_OPMENU + 0) = 0x00000000;
+		RCBA32(ICH9_SPI_OPMENU + 4) = 0x00000000;
+		RCBA16(ICH9_SPI_HSFS) |= ICH9_SPI_HSFS_FLOCKDN;
+	}
+
    debug("BIOS hard locked until next full reset.\n");

return 0;