intel/i945: Use MMCONF_SUPPORT_DEFAULT

Change all PCI configuration accesses to MMIO on all boards
with i945 chipset. To enable MMIO style access, add explicit
PCI IO config write in the bootblock.

Change-Id: Ia1ab73f1a2dcda87db4eb9b2ffddc6f7b4382b01
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/3584
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>
Reviewed-by: Nico Huber <nico.huber@secunet.com>

3 files changed, 30 insertions, 1 deletions

diff --git a/src/northbridge/intel/i945/Kconfig b/src/northbridge/intel/i945/Kconfig
index fbc9988f02..135cbe3cf8 100644
--- a/src/northbridge/intel/i945/Kconfig
+++ b/src/northbridge/intel/i945/Kconfig
@@ -24,6 +24,8 @@ if NORTHBRIDGE_INTEL_I945
 
 config NORTHBRIDGE_SPECIFIC_OPTIONS # dummy
 	def_bool y
+	select MMCONF_SUPPORT
+	select MMCONF_SUPPORT_DEFAULT
 	select HAVE_DEBUG_RAM_SETUP
 	select LAPIC_MONOTONIC_TIMER
 
@@ -32,6 +34,10 @@ config NORTHBRIDGE_INTEL_SUBTYPE_I945GC
 config NORTHBRIDGE_INTEL_SUBTYPE_I945GM
 	def_bool n
 
+config BOOTBLOCK_NORTHBRIDGE_INIT
+	string
+	default "northbridge/intel/i945/bootblock.c"
+
 config VGA_BIOS_ID
 	string
 	default "8086,27a2"
diff --git a/src/northbridge/intel/i945/bootblock.c b/src/northbridge/intel/i945/bootblock.c
new file mode 100644
index 0000000000..4571446cae
--- /dev/null
+++ b/src/northbridge/intel/i945/bootblock.c
@@ -0,0 +1,24 @@
+#include <arch/io.h>
+
+/* Just re-define this instead of including i945.h. It blows up romcc. */
+#define PCIEXBAR	0x48
+
+static void bootblock_northbridge_init(void)
+{
+	uint32_t reg;
+
+	/*
+	 * The "io" variant of the config access is explicitly used to
+	 * setup the PCIEXBAR because CONFIG_MMCONF_SUPPORT_DEFAULT is set to
+	 * to true. That way all subsequent non-explicit config accesses use
+	 * MCFG. This code also assumes that bootblock_northbridge_init() is
+	 * the first thing called in the non-asm boot block code. The final
+	 * assumption is that no assembly code is using the
+	 * CONFIG_MMCONF_SUPPORT_DEFAULT option to do PCI config acceses.
+	 *
+	 * The PCIEXBAR is assumed to live in the memory mapped IO space under
+	 * 4GiB.
+	 */
+	reg = CONFIG_MMCONF_BASE_ADDRESS | 4 | 1; /* 64MiB - 0-63 buses. */
+	pci_io_write_config32(PCI_DEV(0,0,0), PCIEXBAR, reg);
+}
diff --git a/src/northbridge/intel/i945/early_init.c b/src/northbridge/intel/i945/early_init.c
index d91930fe16..fd9f6b79b1 100644
--- a/src/northbridge/intel/i945/early_init.c
+++ b/src/northbridge/intel/i945/early_init.c
@@ -173,7 +173,6 @@ static void i945_setup_bars(void)
 	/* Set up all hardcoded northbridge BARs */
 	pci_write_config32(PCI_DEV(0, 0x00, 0), EPBAR, DEFAULT_EPBAR | 1);
 	pci_write_config32(PCI_DEV(0, 0x00, 0), MCHBAR, DEFAULT_MCHBAR | 1);
-	pci_write_config32(PCI_DEV(0, 0x00, 0), PCIEXBAR, DEFAULT_PCIEXBAR | 5); /* 64MB - busses 0-63 */
 	pci_write_config32(PCI_DEV(0, 0x00, 0), DMIBAR, DEFAULT_DMIBAR | 1);
 	pci_write_config32(PCI_DEV(0, 0x00, 0), X60BAR, DEFAULT_X60BAR | 1);