From fbdb085549b6c500e12dc2fb21143a197b4be042 Mon Sep 17 00:00:00 2001 From: Kyösti Mälkki Date: Mon, 1 Jul 2013 11:21:53 +0300 Subject: intel/sandybridge intel/ivybridge: Use MMCONF_SUPPORT_DEFAULT MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Change all PCI configuration accesses to MMIO on all boards with SandyBridge and IvyBridge. To enable MMIO style access, add explicit PCI IO config write in the bootblock. Change-Id: I8f957a80bf57df000897c5a080dd5ff131b1ec0d Signed-off-by: Kyösti Mälkki Reviewed-on: http://review.coreboot.org/3576 Tested-by: build bot (Jenkins) Reviewed-by: Nico Huber --- src/northbridge/intel/sandybridge/bootblock.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) create mode 100644 src/northbridge/intel/sandybridge/bootblock.c (limited to 'src/northbridge/intel/sandybridge/bootblock.c') diff --git a/src/northbridge/intel/sandybridge/bootblock.c b/src/northbridge/intel/sandybridge/bootblock.c new file mode 100644 index 0000000000..1c1d49214b --- /dev/null +++ b/src/northbridge/intel/sandybridge/bootblock.c @@ -0,0 +1,26 @@ +#include + +/* Just re-define this instead of including sandybridge.h. It blows up romcc. */ +#define PCIEXBAR 0x60 + +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 = 0; + pci_io_write_config32(PCI_DEV(0,0,0), PCIEXBAR + 4, reg); + reg = CONFIG_MMCONF_BASE_ADDRESS | 4 | 1; /* 64MiB - 0-63 buses. */ + pci_io_write_config32(PCI_DEV(0,0,0), PCIEXBAR, reg); +} -- cgit v1.2.3