amd/stoneyridge: Refactor SMI handler

Rewrite the handler to be more compact and extendable.  The old
functionality is duplicated after the rewrite.  All SMI source registers
(except for SmiSciStatus) behave identically so these are consolidated.
Register 0x80 contains sources 0-31, 0x81 sources 32-63, and so on.

Create a table of mini-handlers to be supported in the soc directory.
As SMI sources are discovered, attempt to find the corresponding handler
and then execute it.

Change-Id: Ic7050ecf65c2af036fe297f429a0bbdc709ad4c1
Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-on: https://review.coreboot.org/21746
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marc Jones <marc@marcjonesconsulting.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/soc/amd/stoneyridge/include/soc/smi.h b/src/soc/amd/stoneyridge/include/soc/smi.h
index 5e6f6ff31e..0a865b7496 100644
--- a/src/soc/amd/stoneyridge/include/soc/smi.h
+++ b/src/soc/amd/stoneyridge/include/soc/smi.h
@@ -194,6 +194,11 @@ enum smi_lvl {
 	SMI_LVL_HIGH = 1,
 };
 
+struct smi_sources_t {
+	int type;
+	void (*handler)(void);
+};
+
 uint16_t pm_acpi_smi_cmd_port(void);
 void configure_gevent_smi(uint8_t gevent, uint8_t mode, uint8_t level);
 void disable_gevent_smi(uint8_t gevent);