diff options
Diffstat (limited to 'src/soc/intel/broadwell/bootblock.c')
| -rw-r--r-- | src/soc/intel/broadwell/bootblock.c | 32 |
1 files changed, 19 insertions, 13 deletions
diff --git a/src/soc/intel/broadwell/bootblock.c b/src/soc/intel/broadwell/bootblock.c index 1e32f357a1..9de757ed0a 100644 --- a/src/soc/intel/broadwell/bootblock.c +++ b/src/soc/intel/broadwell/bootblock.c @@ -1,28 +1,34 @@ /* SPDX-License-Identifier: GPL-2.0-only */ #include <arch/bootblock.h> +#include <assert.h> #include <device/pci_ops.h> #include <soc/pci_devs.h> #include <soc/systemagent.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 - * 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 + * The "io" variant of the config access is explicitly used to setup the + * PCIEXBAR because CONFIG(MMCONF_SUPPORT) is set 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) option to do PCI config accesses. * - * The PCIEXBAR is assumed to live in the memory mapped IO space under - * 4GiB. + * The PCIEXBAR is assumed to live in the memory mapped IO space under 4GiB. */ - reg = 0; - pci_io_write_config32(SA_DEV_ROOT, PCIEXBAR + 4, reg); - reg = CONFIG_MMCONF_BASE_ADDRESS | 4 | 1; /* 64MiB - 0-63 buses. */ + const uint32_t reg = CONFIG_MMCONF_BASE_ADDRESS | encode_pciexbar_length() | 1; + pci_io_write_config32(SA_DEV_ROOT, PCIEXBAR + 4, 0); pci_io_write_config32(SA_DEV_ROOT, PCIEXBAR, reg); } |