diff options
Diffstat (limited to 'src/northbridge/intel/gm45/bootblock.c')
| -rw-r--r-- | src/northbridge/intel/gm45/bootblock.c | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/src/northbridge/intel/gm45/bootblock.c b/src/northbridge/intel/gm45/bootblock.c index 2e41981e75..9c45f7e3f8 100644 --- a/src/northbridge/intel/gm45/bootblock.c +++ b/src/northbridge/intel/gm45/bootblock.c @@ -1,14 +1,24 @@ /* SPDX-License-Identifier: GPL-2.0-only */ #include <arch/bootblock.h> +#include <assert.h> #include <device/pci_ops.h> +#include <types.h> #include "gm45.h" -void bootblock_early_northbridge_init(void) +static uint32_t encode_pciexbar_length(void) { - uint32_t reg; + switch (CONFIG_MMCONF_BUS_NUMBER) { + case 256: return 0 << 1; + case 128: return 1 << 1; + case 64: return 2 << 1; + default: return dead_code_t(uint32_t); + } +} +void bootblock_early_northbridge_init(void) +{ /* * The "io" variant of the config access is explicitly used to * setup the PCIEXBAR because CONFIG(MMCONF_SUPPORT) is set to @@ -21,8 +31,7 @@ void bootblock_early_northbridge_init(void) * 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), D0F0_PCIEXBAR_HI, reg); - reg = CONFIG_MMCONF_BASE_ADDRESS | (2 << 1) | 1; /* 64MiB - 0-63 buses. */ - pci_io_write_config32(PCI_DEV(0,0,0), D0F0_PCIEXBAR_LO, reg); + const uint32_t reg = CONFIG_MMCONF_BASE_ADDRESS | encode_pciexbar_length() | 1; + pci_io_write_config32(PCI_DEV(0, 0, 0), D0F0_PCIEXBAR_HI, 0); + pci_io_write_config32(PCI_DEV(0, 0, 0), D0F0_PCIEXBAR_LO, reg); } |