soc/intel/broadwell: Define and use MMCONF_BUS_NUMBER
Note that ACPI MCFG generation reported too many busses.
Change-Id: I5acd26bac675cc818df46f60887f90b76f4580a2
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50034
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/soc/intel/broadwell/bootblock.c b/src/soc/intel/broadwell/bootblock.c
index 1e32f35..9de757e 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>
+static uint32_t encode_pciexbar_length(void)
+{
+ 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)
{
- uint32_t reg;
-
/*
- * 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);
}