drivers/intel/fsp2_0: Split reset handling logic

FSP 2.0 spec only defines 2 reset request (COLD, WARM) exit codes. The
rest 6 codes are platform-specific and may vary. Modify helper function
so that only basic resets are handled and let SoC deal with the rest.

Change-Id: Ib2f446e0449301407b135933a2088bcffc3ac32a
Signed-off-by: Andrey Petrov <andrey.petrov@intel.com>
Reviewed-on: https://review.coreboot.org/15730
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)

src/drivers/intel/fsp2_0/include/fsp/api.h

@@ -22,9 +22,12 @@ enum fsp_status {
 	FSP_SUCCESS = 0x00000000,
 	FSP_STATUS_RESET_REQUIRED_COLD = 0x40000001,
 	FSP_STATUS_RESET_REQUIRED_WARM = 0x40000002,
-	FSP_STATUS_RESET_REQUIRED_SHUTDOWN = 0x40000003,
-	FSP_STATUS_RESET_REQUIRED_UNDEFINED = 0x40000004,
-	FSP_STATUS_RESET_REQUIRED_GLOBAL_RESET = 0x40000005,
+	FSP_STATUS_RESET_REQUIRED_3 = 0x40000003,
+	FSP_STATUS_RESET_REQUIRED_4 = 0x40000004,
+	FSP_STATUS_RESET_REQUIRED_5 = 0x40000005,
+	FSP_STATUS_RESET_REQUIRED_6 = 0x40000006,
+	FSP_STATUS_RESET_REQUIRED_7 = 0x40000007,
+	FSP_STATUS_RESET_REQUIRED_8 = 0x40000008,
 	FSP_INVALID_PARAMETER = 0x80000002,
 	FSP_UNSUPPORTED = 0x80000003,
 	FSP_NOT_READY = 0x80000006,

src/drivers/intel/fsp2_0/include/fsp/util.h

@@ -42,9 +42,15 @@ enum cb_err fsp_validate_component(struct fsp_header *hdr,
 /* Load a vbt.bin file for graphics. Returns 0 if a valid VBT is not found. */
 uintptr_t fsp_load_vbt(void);
 
-/* Trivial handling of reset exit statuses */
+/*
+ * Handle FSP reboot request status. Chipset/soc is expected to provide
+ * chipset_handle_reset() that deals with reset type codes specific to given
+ * SoC. If the requested status is not a reboot status or unhandled, this
+ * function does nothing.
+ */
 void fsp_handle_reset(enum fsp_status status);
-/* Returns true if the non-success status is a reset request */
-bool fsp_reset_requested(enum fsp_status status);
+
+/* SoC/chipset must provide this to handle platform-specific reset codes */
+void chipset_handle_reset(enum fsp_status status);
 
 #endif /* _FSP2_0_UTIL_H_ */

src/drivers/intel/fsp2_0/util.c

@@ -134,8 +134,19 @@ enum cb_err fsp_validate_component(struct fsp_header *hdr,
 	return CB_SUCCESS;
 }
 
+static bool fsp_reset_requested(enum fsp_status status)
+{
+	return (status >= FSP_STATUS_RESET_REQUIRED_COLD &&
+		status <= FSP_STATUS_RESET_REQUIRED_8);
+}
+
 void fsp_handle_reset(enum fsp_status status)
 {
+	if (!fsp_reset_requested(status))
+		return;
+
+	printk(BIOS_DEBUG, "FSP: handling reset type %x\n", status);
+
 	switch(status) {
 	case FSP_STATUS_RESET_REQUIRED_COLD:
 		hard_reset();
@@ -143,16 +154,15 @@ void fsp_handle_reset(enum fsp_status status)
 	case FSP_STATUS_RESET_REQUIRED_WARM:
 		soft_reset();
 		break;
-	case FSP_STATUS_RESET_REQUIRED_GLOBAL_RESET:
-		global_reset();
+	case FSP_STATUS_RESET_REQUIRED_3:
+	case FSP_STATUS_RESET_REQUIRED_4:
+	case FSP_STATUS_RESET_REQUIRED_5:
+	case FSP_STATUS_RESET_REQUIRED_6:
+	case FSP_STATUS_RESET_REQUIRED_7:
+	case FSP_STATUS_RESET_REQUIRED_8:
+		chipset_handle_reset(status);
 		break;
 	default:
 		break;
 	}
 }
-
-bool fsp_reset_requested(enum fsp_status status)
-{
-	return (status >= FSP_STATUS_RESET_REQUIRED_COLD &&
-		status <= FSP_STATUS_RESET_REQUIRED_GLOBAL_RESET);
-}

src/soc/intel/apollolake/chip.c

@@ -412,8 +412,7 @@ static void fsp_notify_dummy(void *arg)
 
 	if ((ret = fsp_notify(ph)) != FSP_SUCCESS) {
 		printk(BIOS_CRIT, "FspNotify failed, ret = %x!\n", ret);
-		if (fsp_reset_requested(ret))
-			fsp_handle_reset(ret);
+		fsp_handle_reset(ret);
 	}
 	/* Call END_OF_FIRMWARE Notify after READY_TO_BOOT Notify */
 	if (ph == READY_TO_BOOT) {

src/soc/intel/apollolake/reset.c

@@ -15,6 +15,7 @@
 
 #include <console/console.h>
 #include <delay.h>
+#include <fsp/util.h>
 #include <reset.h>
 #include <soc/heci.h>
 #include <soc/pm.h>
@@ -57,3 +58,16 @@ void reset_prepare(void)
 	}
 	printk(BIOS_SPEW, "CSE took %lu ms\n", stopwatch_duration_msecs(&sw));
 }
+
+void chipset_handle_reset(enum fsp_status status)
+{
+	switch(status) {
+	case FSP_STATUS_RESET_REQUIRED_5: /* Global Reset */
+		global_reset();
+		break;
+	default:
+		printk(BIOS_ERR, "unhandled reset type %x\n", status);
+		die("unknown reset type");
+		break;
+	}
+}