astbmc: Try IPMI HIOMAP for P8

The HIOMAP protocol was developed after the release of P8 in preparation
for P9. As a consequence P9 always uses it, but it has rarely been
enabled for P8. P8DTU has recently added IPMI HIOMAP support to its BMC
firmware, so enable its use in skiboot with P8 machines. Doing so
requires some rework to ensure fallback works correctly as in the past
the fallback was to mbox, which will only work for P9.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Stewart Smith <stewart@linux.ibm.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/hw/ast-bmc/ast-io.c b/hw/ast-bmc/ast-io.c
index 38ca86c4..11cc084c 100644
--- a/hw/ast-bmc/ast-io.c
+++ b/hw/ast-bmc/ast-io.c
@@ -360,7 +360,12 @@ bool ast_io_init(void)
 	return ast_io_is_rw();
 }
 
-bool ast_lpc_fw_needs_hiomap(void)
+bool ast_lpc_fw_ipmi_hiomap(void)
+{
+	return platform.bmc->sw->ipmi_oem_hiomap_cmd != 0;
+}
+
+bool ast_lpc_fw_mbox_hiomap(void)
 {
 	struct dt_node *n;