Allow bigger flash write commands

Version 1 of EC_CMD_FLASH_WRITE will use as big a write as possible given
the available command parameter space.  Falls back to 64 byte writes on old
platforms.

BUG=chrome-os-partner:20571
BRANCH=none
TEST=Copy burn_my_ec onto a link and run it.  Write size should be 64 bytes
     for the first half of the update (since the old EC doesn't support ver.1
     of the write command) and 240 bytes for the second half of the update.

Change-Id: I5900de3a5700d7c82a2e0c3cf9921b7ced1c0343
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/60511

1 files changed, 45 insertions, 0 deletions

diff --git a/util/misc_util.c b/util/misc_util.c
index 8410f03cfa..005c84e50c 100644
--- a/util/misc_util.c
+++ b/util/misc_util.c
@@ -9,6 +9,7 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include "comm-host.h"
 #include "misc_util.h"
 
 int write_file(const char *filename, const char *buf, int size)
@@ -81,3 +82,47 @@ int is_string_printable(const char *buf)
 
 	return 1;
 }
+
+/**
+ * Get the versions of the command supported by the EC.
+ *
+ * @param cmd		Command
+ * @param pmask		Destination for version mask; will be set to 0 on
+ *			error.
+ * @return 0 if success, <0 if error
+ */
+int ec_get_cmd_versions(int cmd, uint32_t *pmask)
+{
+	struct ec_params_get_cmd_versions pver;
+	struct ec_response_get_cmd_versions rver;
+	int rv;
+
+	*pmask = 0;
+
+	pver.cmd = cmd;
+	rv = ec_command(EC_CMD_GET_CMD_VERSIONS, 0, &pver, sizeof(pver),
+			&rver, sizeof(rver));
+
+	if (rv < 0)
+		return rv;
+
+	*pmask = rver.version_mask;
+	return 0;
+}
+
+/**
+ * Return non-zero if the EC supports the command and version
+ *
+ * @param cmd		Command to check
+ * @param ver		Version to check
+ * @return non-zero if command version supported; 0 if not.
+ */
+int ec_cmd_version_supported(int cmd, int ver)
+{
+	uint32_t mask = 0;
+
+	if (ec_get_cmd_versions(cmd, &mask))
+		return 0;
+
+	return (mask & EC_VER_MASK(ver)) ? 1 : 0;
+}