fusee: implement partition support; needs some tweeks

fusee/fusee-primary/src/sdmmc.h

@@ -27,7 +27,6 @@ struct mmc {
     /* Controller properties */
     char *name;
     unsigned int timeout;
-
     enum mmc_card_type card_type;
     bool use_dma;
 
@@ -35,6 +34,12 @@ struct mmc {
     uint8_t cid[15];
     uint32_t relative_address;
 
+    uint8_t partition_support;
+    uint8_t partition_config;
+    uint8_t partition_setting;
+    uint8_t partition_attribute;
+    uint32_t partition_switch_time;
+
     uint8_t read_block_order;
     bool uses_block_addressing;
 
@@ -52,6 +57,15 @@ enum sdmmc_controller {
 };
 
 
+/**
+ * Parititions supported by the Switch eMMC.
+ */
+enum sdmmc_partition {
+    MMC_PARTITION_USER  = 0,
+    MMC_PARTITION_BOOT1 = 1,
+    MMC_PARITTION_BOOT2 = 2,
+};
+
 
 /**
  * Initiailzes an SDMMC controller for use with an eMMC or SD card device.
@@ -62,6 +76,18 @@ enum sdmmc_controller {
 int sdmmc_init(struct mmc *mmc, enum sdmmc_controller controller);
 
 
+/**
+ * Selects the active MMC partition. Can be used to select
+ * boot partitions for access. Affects all operations going forward.
+ *
+ * @param mmc The MMC controller whose card is to be used.
+ * @param partition The partition number to be selected.
+ *
+ * @return 0 on success, or an error code on failure.
+ */
+int sdmmc_select_partition(struct mmc *mmc, enum sdmmc_partition partition);
+
+
 /**
  * Reads a sector or sectors from a given SD card.
  *