soc/intel: Always advertise MMIO window above 4G in ACPI tables

There should be no harm in advertising the MMIO window above 4G in
ACPI tables unconditionally. OS can decide whether or not to use the
window. This change removes the config option enable_above_4GB_mmio
and instead adds the correct MMIO window (above 4G) details to ACPI
tables always.

Change-Id: Ie728f6ee7f396918e61b29ade862b57dac36cb08
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41276
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 0 insertions, 19 deletions

diff --git a/src/soc/intel/common/block/systemagent/systemagent.c b/src/soc/intel/common/block/systemagent/systemagent.c
index 3da837c0af..7355817ec2 100644
--- a/src/soc/intel/common/block/systemagent/systemagent.c
+++ b/src/soc/intel/common/block/systemagent/systemagent.c
@@ -96,30 +96,11 @@ static void sa_read_map_entry(struct device *dev,
 	*result = value;
 }
 
-/*
- * This function will get above 4GB mmio enable config specific to soc.
- *
- * Return values:
- *  0 = Above 4GB memory is not enable
- *  1 = Above 4GB memory is enable
- */
-static int get_enable_above_4GB_mmio(void)
-{
-	const struct soc_intel_common_config *common_config;
-	common_config = chip_get_common_soc_structure();
-
-	return common_config->enable_above_4GB_mmio;
-}
-
 /* Fill MMIO resource above 4GB into GNVS */
 void sa_fill_gnvs(global_nvs_t *gnvs)
 {
-	if (!get_enable_above_4GB_mmio())
-		return;
-
 	struct device *sa_dev = pcidev_path_on_root(SA_DEVFN_ROOT);
 
-	gnvs->e4gm = 1;
 	sa_read_map_entry(sa_dev, &sa_memory_map[SA_TOUUD_REG], &gnvs->a4gb);
 	gnvs->a4gs = ABOVE_4GB_MEM_BASE_SIZE;
 	printk(BIOS_DEBUG, "PCI space above 4GB MMIO is from 0x%llx  to len = 0x%llx\n",