stoneyridge: Enable legacy IO
Legacy IO enables access to RTC IO 0x70-0x73. This is needed for CMOS to
function correctly.
BUG=b:110817463
TEST=ran firmware_CorruptFwSigB on grunt
Change-Id: I533226ba764f567e348577d7fcf6ebe43336609a
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Reviewed-on: https://review.coreboot.org/27268
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
diff --git a/src/soc/amd/stoneyridge/southbridge.c b/src/soc/amd/stoneyridge/southbridge.c
index 591a8f7..18e6c6c 100644
--- a/src/soc/amd/stoneyridge/southbridge.c
+++ b/src/soc/amd/stoneyridge/southbridge.c
@@ -375,6 +375,13 @@
pm_write32(PM_DECODE_EN, reg | CF9_IO_EN);
}
+static void sb_enable_legacy_io(void)
+{
+ uint32_t reg = pm_read32(PM_DECODE_EN);
+
+ pm_write32(PM_DECODE_EN, reg | LEGACY_IO_EN);
+}
+
void sb_clk_output_48Mhz(void)
{
u32 ctrl;
@@ -550,6 +557,7 @@
sb_disable_4dw_burst(); /* Must be disabled on CZ(ST) */
sb_acpi_mmio_decode();
sb_enable_cf9_io();
+ sb_enable_legacy_io();
enable_aoac_devices();
}