cros_ec: Add a function for decoding the Chrome OS EC flashmap

[karo-tx-uboot.git] / drivers / misc / cros_ec.c

diff --git a/drivers/misc/cros_ec.c b/drivers/misc/cros_ec.c
index 301e8ebbf57babe28ff1de3b218ceab7b11c0024..1998653754bdb0e075396a3985851e40e755a943 100644 (file)
--- a/drivers/misc/cros_ec.c
+++ b/drivers/misc/cros_ec.c
@@ -958,6 +958,56 @@ int cros_ec_decode_region(int argc, char * const argv[])
        return -1;
 }
 
+int cros_ec_decode_ec_flash(const void *blob, struct fdt_cros_ec *config)
+{
+       int flash_node, node;
+
+       node = fdtdec_next_compatible(blob, 0, COMPAT_GOOGLE_CROS_EC);
+       if (node < 0) {
+               debug("Failed to find chrome-ec node'\n");
+               return -1;
+       }
+
+       flash_node = fdt_subnode_offset(blob, node, "flash");
+       if (flash_node < 0) {
+               debug("Failed to find flash node\n");
+               return -1;
+       }
+
+       if (fdtdec_read_fmap_entry(blob, flash_node, "flash",
+                                  &config->flash)) {
+               debug("Failed to decode flash node in chrome-ec'\n");
+               return -1;
+       }
+
+       config->flash_erase_value = fdtdec_get_int(blob, flash_node,
+                                                   "erase-value", -1);
+       for (node = fdt_first_subnode(blob, flash_node); node >= 0;
+            node = fdt_next_subnode(blob, node)) {
+               const char *name = fdt_get_name(blob, node, NULL);
+               enum ec_flash_region region;
+
+               if (0 == strcmp(name, "ro")) {
+                       region = EC_FLASH_REGION_RO;
+               } else if (0 == strcmp(name, "rw")) {
+                       region = EC_FLASH_REGION_RW;
+               } else if (0 == strcmp(name, "wp-ro")) {
+                       region = EC_FLASH_REGION_WP_RO;
+               } else {
+                       debug("Unknown EC flash region name '%s'\n", name);
+                       return -1;
+               }
+
+               if (fdtdec_read_fmap_entry(blob, node, "reg",
+                                          &config->region[region])) {
+                       debug("Failed to decode flash region in chrome-ec'\n");
+                       return -1;
+               }
+       }
+
+       return 0;
+}
+
 /**
  * Perform a flash read or write command
  *