[Skiboot] [RFC PATCH 6/6] astbmc: Prefer ipmi-flash for PNOR access

[Andrew Jeffery]

If the IPMI command is not available, fall back to the mailbox
interface.

Signed-off-by: Andrew Jeffery <andrew at aj.id.au>
---
 hw/ast-bmc/ast-io.c       | 10 +++++++---
 include/ast.h             | 11 +++++++++--
 platforms/astbmc/common.c |  8 ++++++--
 platforms/astbmc/pnor.c   | 35 +++++++++++++++++++++++++----------
 4 files changed, 47 insertions(+), 17 deletions(-)

diff --git a/hw/ast-bmc/ast-io.c b/hw/ast-bmc/ast-io.c
index a6ae85a4d24f..e8258b4cfc02 100644
--- a/hw/ast-bmc/ast-io.c
+++ b/hw/ast-bmc/ast-io.c
@@ -426,12 +426,16 @@ bool ast_io_init(void)
 	return ast_io_is_rw();
 }
 
-bool ast_lpc_fw_is_mbox(void)
+bool ast_lpc_fw_needs_hiomap(void)
 {
-	return dt_find_compatible_node(dt_root, NULL, "mbox");
+	struct dt_node *n;
+
+	n = dt_find_compatible_node(dt_root, NULL, "mbox");
+
+	return n != NULL;
 }
 
-bool ast_lpc_fw_is_flash(void)
+bool ast_lpc_fw_maps_flash(void)
 {
 	uint8_t boot_version;
 	uint8_t boot_flags;
diff --git a/include/ast.h b/include/ast.h
index b30f7bf27737..831fae340348 100644
--- a/include/ast.h
+++ b/include/ast.h
@@ -86,10 +86,17 @@ bool ast_can_isolate_sp(void);
 bool ast_sio_disable(void);
 bool ast_io_init(void);
 bool ast_io_is_rw(void);
-bool ast_lpc_fw_is_flash(void);
-bool ast_lpc_fw_is_mbox(void);
+bool ast_lpc_fw_maps_flash(void);
+bool ast_lpc_fw_needs_hiomap(void);
 bool ast_scratch_reg_is_mbox(void);
 
+enum ast_flash_style {
+    raw_flash,
+    raw_mem,
+    hiomap_ipmi,
+    hiomap_mbox,
+};
+
 /* UART configuration */
 
 bool ast_is_vuart1_enabled(void);
diff --git a/platforms/astbmc/common.c b/platforms/astbmc/common.c
index 23550ef37a67..ced38bc3374f 100644
--- a/platforms/astbmc/common.c
+++ b/platforms/astbmc/common.c
@@ -120,11 +120,15 @@ static int astbmc_fru_init(void)
 
 void astbmc_init(void)
 {
+	/* Register the BT interface with the IPMI layer
+	 *
+	 * Initialise this first to enable PNOR access
+	 */
+	bt_init();
+
 	/* Initialize PNOR/NVRAM */
 	pnor_init();
 
-	/* Register the BT interface with the IPMI layer */
-	bt_init();
 	/* Initialize elog */
 	elog_init();
 	ipmi_sel_init();
diff --git a/platforms/astbmc/pnor.c b/platforms/astbmc/pnor.c
index 55784ee4594f..9241dde94a2d 100644
--- a/platforms/astbmc/pnor.c
+++ b/platforms/astbmc/pnor.c
@@ -18,6 +18,7 @@
 #include <device.h>
 #include <console.h>
 #include <opal.h>
+#include <libflash/ipmi-flash.h>
 #include <libflash/mbox-flash.h>
 #include <libflash/libflash.h>
 #include <libflash/libffs.h>
@@ -30,12 +31,16 @@ int pnor_init(void)
 {
 	struct spi_flash_ctrl *pnor_ctrl = NULL;
 	struct blocklevel_device *bl = NULL;
+	enum ast_flash_style style;
 	int rc;
-	bool do_mbox;
 
-	do_mbox = ast_lpc_fw_is_mbox();
-	if (do_mbox) {
-		rc = mbox_flash_init(&bl);
+	if (ast_lpc_fw_needs_hiomap()) {
+		style = hiomap_ipmi;
+		rc = ipmi_flash_init(&bl);
+		if (rc) {
+			style = hiomap_mbox;
+			rc = mbox_flash_init(&bl);
+		}
 	} else {
 		/* Open controller and flash. If the LPC->AHB doesn't point to
 		 * the PNOR flash base we assume we're booting from BMC system
@@ -43,10 +48,12 @@ int pnor_init(void)
 		 * FW reads & writes).
 		 */
 
-		if (ast_lpc_fw_is_flash())
+		if (ast_lpc_fw_maps_flash()) {
+			style = raw_flash;
 			rc = ast_sf_open(AST_SF_TYPE_PNOR, &pnor_ctrl);
-		else {
+		} else {
 			printf("PLAT: Memboot detected\n");
+			style = raw_mem;
 			rc = ast_sf_open(AST_SF_TYPE_MEM, &pnor_ctrl);
 		}
 		if (rc) {
@@ -66,12 +73,20 @@ int pnor_init(void)
 	if (!rc)
 		return 0;
 
- fail:
+fail:
 	if (bl) {
-		if (do_mbox)
-			mbox_flash_exit(bl);
-		else
+		switch (style) {
+		case raw_flash:
+		case raw_mem:
 			flash_exit(bl);
+			break;
+		case hiomap_ipmi:
+			ipmi_flash_exit(bl);
+			break;
+		case hiomap_mbox:
+			mbox_flash_exit(bl);
+			break;
+		}
 	}
 	if (pnor_ctrl)
 		ast_sf_close(pnor_ctrl);
-- 
2.17.1