New patch to review for coreboot: 80c7fe7 southbridge/amd/rs780: Remove requirement for CF8/CFC config access

[Scott Duplichan]

Scott Duplichan ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/8394

-gerrit

commit 80c7fe7b1c4189d2a490db3bf511317e866629c1
Author: Scott Duplichan 
Date:   Sat Feb 7 22:52:24 2015 -0600

southbridge/amd/rs780: Remove requirement for CF8/CFC config access

The AMD RS780 early initialization code originally used the CF8/CFC I/O
    method for PCI configuration space access. After the default configuration
    access method was changed to MMIO (http://review.coreboot.org/#/c/3608/),
    booting would hang at "PCI: pci_scan_bus for bus 01". Fix the problem by
    changing function rs780_nb_gfx_dev_table() so that it no longer borrows
    the BAR3 address needed for PCIe MMIO config usage.

Change-Id: I8816b94c848e1b50f8c880e5867a96ca2a33a8a7
    Signed-off-by: Scott Duplichan 
---
 src/southbridge/amd/rs780/rs780.c | 22 ++--------------------
 1 file changed, 2 insertions(+), 20 deletions(-)

diff --git a/src/southbridge/amd/rs780/rs780.c b/src/southbridge/amd/rs780/rs780.c
index dc5b9e4..5756cea 100644
--- a/src/southbridge/amd/rs780/rs780.c
+++ b/src/southbridge/amd/rs780/rs780.c
@@ -190,21 +190,10 @@ static void rs780_nb_gfx_dev_table(device_t nb_dev, device_t dev)
 {
    /* NB_InitGFXStraps */
    u32 MMIOBase, apc04, apc18, apc24, romstrap2;
-	msr_t pcie_mmio_save = { 0, 0 };
    volatile u32 * strap;

-	// disable processor pcie mmio, if enabled
-	if (is_family10h()) {
-		msr_t temp;
-		pcie_mmio_save = temp = rdmsr (0xc0010058);
-		temp.lo &= ~1;
-		wrmsr (0xc0010058, temp);
-	}
-
-	/* Get PCIe configuration space. */
-	MMIOBase = pci_read_config32(nb_dev, 0x1c) & 0xfffffff0;
-	/* Temporarily disable PCIe configuration space. */
-	set_htiu_enable_bits(nb_dev, 0x32, 1<<28, 0);
+	// Choose a base address that is unused and routed to the RS780
+	MMIOBase = 0xFFC00000;

// 1E: NB_BIF_SPARE
    set_nbmisc_enable_bits(nb_dev, 0x1e, 0xffffffff, 1<<1 | 1<<4 | 1<<6 | 1<<7);
@@ -262,13 +251,6 @@ static void rs780_nb_gfx_dev_table(device_t nb_dev, device_t dev)
    pci_write_config32(dev, 0x18, apc18);
    pci_write_config32(dev, 0x24, apc24);

-	/* Enable PCIe configuration space. */
-	set_htiu_enable_bits(nb_dev, 0x32, 0, 1<<28);
-
-	// restore processor pcie mmio
-	if (is_family10h())
-		wrmsr (0xc0010058, pcie_mmio_save);
-
    printk(BIOS_INFO, "GC is accessible from now on.\n");
 }