From e5689cfe5782c8b168a73e1f7a450641005bfe01 Mon Sep 17 00:00:00 2001
From: CTCaer <ctcaer@gmail.com>
Date: Sat, 6 Feb 2021 17:11:32 +0200
Subject: [PATCH] fatfs: Add raw emuMMC support for USER partition

---
 bdk/libs/fatfs/diskio.h           |  3 ++-
 nyx/nyx_gui/libs/fatfs/diskio.c   | 22 +++++++++++++++++++++-
 nyx/nyx_gui/libs/fatfs/ffconf.h   |  4 ++--
 nyx/nyx_gui/storage/nx_emmc_bis.h |  1 +
 4 files changed, 26 insertions(+), 4 deletions(-)

diff --git a/bdk/libs/fatfs/diskio.h b/bdk/libs/fatfs/diskio.h
index 5b23027..b5299c6 100644
--- a/bdk/libs/fatfs/diskio.h
+++ b/bdk/libs/fatfs/diskio.h
@@ -27,7 +27,8 @@ typedef enum {
 	DRIVE_SD   = 0,
 	DRIVE_RAM  = 1,
 	DRIVE_EMMC = 2,
-	DRIVE_BIS  = 3
+	DRIVE_BIS  = 3,
+	DRIVE_EMU  = 4
 } DDRIVE;
 
 
diff --git a/nyx/nyx_gui/libs/fatfs/diskio.c b/nyx/nyx_gui/libs/fatfs/diskio.c
index 5e3a47b..3d37f7d 100644
--- a/nyx/nyx_gui/libs/fatfs/diskio.c
+++ b/nyx/nyx_gui/libs/fatfs/diskio.c
@@ -18,6 +18,8 @@
 
 static u32 sd_rsvd_sectors = 0;
 static u32 ramdisk_sectors = 0;
+static u32 emummc_sectors = 0;
+
 /*-----------------------------------------------------------------------*/
 /* Get Drive Status                                                      */
 /*-----------------------------------------------------------------------*/
@@ -57,7 +59,8 @@ DRESULT disk_read (
 	case DRIVE_EMMC:
 		return sdmmc_storage_read(&emmc_storage, sector, count, (void *)buff) ? RES_OK : RES_ERROR;
 	case DRIVE_BIS:
-		return nx_emmc_bis_read(sector, count, (void *)buff);
+	case DRIVE_EMU:
+		return nx_emmc_bis_read(sector, count, (void *)buff) ? RES_OK : RES_ERROR;
 	}
 
 	return RES_ERROR;
@@ -82,6 +85,8 @@ DRESULT disk_write (
 	case DRIVE_EMMC:
 	case DRIVE_BIS:
 		return RES_WRPRT;
+	case DRIVE_EMU:
+		return nx_emmc_bis_write(sector, count, (void *)buff) ? RES_OK : RES_ERROR;
 	}
 
 	return RES_ERROR;
@@ -122,6 +127,18 @@ DRESULT disk_ioctl (
 			break;
 		}
 	}
+	else if (pdrv == DRIVE_EMU)
+	{
+		switch (cmd)
+		{
+		case GET_SECTOR_COUNT:
+			*buf = emummc_sectors;
+			break;
+		case GET_BLOCK_SIZE:
+			*buf = 32768; // Align to 16MB.
+			break;
+		}
+	}
 
 	return RES_OK;
 }
@@ -144,6 +161,9 @@ DRESULT disk_set_info (
 		case DRIVE_RAM:
 			ramdisk_sectors = *buf;
 			break;
+		case DRIVE_EMU:
+			emummc_sectors = *buf;
+			break;
 		}
 	}
 
diff --git a/nyx/nyx_gui/libs/fatfs/ffconf.h b/nyx/nyx_gui/libs/fatfs/ffconf.h
index 08bee44..8e417ad 100644
--- a/nyx/nyx_gui/libs/fatfs/ffconf.h
+++ b/nyx/nyx_gui/libs/fatfs/ffconf.h
@@ -179,13 +179,13 @@
 / Drive/Volume Configurations
 /---------------------------------------------------------------------------*/
 
-#define FF_VOLUMES		4
+#define FF_VOLUMES		5
 /* Number of volumes (logical drives) to be used. (1-10) */
 
 
 #define FF_STR_VOLUME_ID	1
 // Order is important. Any change to order, must also be reflected to diskio drive enum.
-#define FF_VOLUME_STRS		"sd","ram","emmc","bis"
+#define FF_VOLUME_STRS		"sd","ram","emmc","bis","emu"
 /* FF_STR_VOLUME_ID switches support for volume ID in arbitrary strings.
 /  When FF_STR_VOLUME_ID is set to 1 or 2, arbitrary strings can be used as drive
 /  number in the path name. FF_VOLUME_STRS defines the volume ID strings for each
diff --git a/nyx/nyx_gui/storage/nx_emmc_bis.h b/nyx/nyx_gui/storage/nx_emmc_bis.h
index f1783b3..1a137fa 100644
--- a/nyx/nyx_gui/storage/nx_emmc_bis.h
+++ b/nyx/nyx_gui/storage/nx_emmc_bis.h
@@ -224,6 +224,7 @@ typedef struct _nx_emmc_cal0_t
 } __attribute__((packed)) nx_emmc_cal0_t;
 
 int  nx_emmc_bis_read(u32 sector, u32 count, void *buff);
+int nx_emmc_bis_write(u32 sector, u32 count, void *buff);
 void nx_emmc_bis_init(emmc_part_t *part, bool enable_cache, u32 emummc_offset);
 void nx_emmc_bis_end();