soc/amd/stoneyridge: Add aoac_ read/write functions

Add 8-bit functions to access the AOAC registers and use them in
southbridge.c.  At this time, there is no reason to pursue WORD or
DWORD access and it's not known if those transaction sizes are
supported.

Change-Id: I3a8f493625f941fb855c0b8a0eff511a9a5ddfe8
Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32645
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Richard Spiegel <richard.spiegel@silverbackltd.com>
Reviewed-by: Martin Roth <martinroth@google.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/src/soc/amd/stoneyridge/sb_util.c b/src/soc/amd/stoneyridge/sb_util.c
index 4bffdbc5cf..530e9cd946 100644
--- a/src/soc/amd/stoneyridge/sb_util.c
+++ b/src/soc/amd/stoneyridge/sb_util.c
@@ -271,6 +271,16 @@ void xhci_pm_write32(uint8_t reg, uint32_t value)
 
 /* aoac read/write - access registers at 0xfed81e00 - not currently used */
 
+u8 aoac_read8(u8 reg)
+{
+	return read8((void *)(ACPIMMIO_AOAC_BASE + reg));
+}
+
+void aoac_write8(u8 reg, u8 value)
+{
+	write8((void *)(ACPIMMIO_AOAC_BASE + reg), value);
+}
+
 uint16_t pm_acpi_pm_cnt_blk(void)
 {
 	return pm_read16(PM1_CNT_BLK);