Diff: MassStorage.cpp

Revision:

0:a6476c138e84

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MassStorage.cpp	Sun Jul 10 01:31:52 2011 +0000
@@ -0,0 +1,180 @@
+
+/*
+Copyright (c) 2010 Peter Barrett
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+
+#include "stdlib.h"
+#include "stdio.h"
+#include "string.h"
+
+#include "Utils.h"
+#include "USBHost.h"
+
+
+int MassStorage_ReadCapacity(int device, u32* blockCount, u32* blockSize);
+int MassStorage_ReadBlock(int device, u32 block, u8* dst);
+int MassStorage_WriteBlock(int device, u32 block, const u8* dst);
+
+
+#define ERR_BAD_CSW_SIGNATURE -200
+
+#define CBW_SIGNATURE  0x43425355
+#define CSW_SIGNATURE  0x53425355
+
+//  Command Block
+typedef struct
+{
+    u32 Signature;
+    u32 Tag;
+    u32 TransferLength;
+    u8 Flags;
+    u8 LUN;
+    u8 CBLength;
+    u8 CB[16];   // only 6 really
+} CBW;
+
+//  Status block
+typedef struct
+{
+    u32 Signature;
+    u32 Tag;
+    u32 DataResidue;
+    u8 Status;
+} CSW;
+
+int SCSIRequestSense(int device);
+
+int DoSCSI(int device, const u8* cmd, int cmdLen, int flags, u8* data, u32 transferLen)
+{
+    CBW cbw;
+    cbw.Signature = CBW_SIGNATURE;
+    cbw.Tag = 0;
+    cbw.TransferLength = transferLen;
+    cbw.Flags = flags;
+    cbw.LUN = 0;
+    cbw.CBLength = cmdLen;
+    memset(cbw.CB,0,sizeof(cbw.CB));
+    memcpy(cbw.CB,cmd,cmdLen);
+
+    int r;
+    r = USBBulkTransfer(device,0x01,(u8*)&cbw,31);   // Send the command
+    if (r < 0)
+        return r;
+
+    if (data)
+    {
+        r = USBBulkTransfer(device,flags | 1,data,transferLen);
+        if (r < 0)
+            return r;
+    }
+
+    CSW csw;
+    csw.Signature = 0;
+    r = USBBulkTransfer(device,0x81,(u8*)&csw,13);
+    if (r < 0)
+        return r;
+
+    if (csw.Signature != CSW_SIGNATURE)
+        return ERR_BAD_CSW_SIGNATURE;
+
+    // ModeSense?
+    if (csw.Status == 1 && cmd[0] != 3)
+        return SCSIRequestSense(device);
+
+    return csw.Status;
+}
+
+int SCSITestUnitReady(int device)
+{
+    u8 cmd[6];
+    memset(cmd,0,6);
+    return DoSCSI(device,cmd,6,DEVICE_TO_HOST,0,0);
+}
+
+int SCSIRequestSense(int device)
+{
+    u8 cmd[6] = {0x03,0,0,0,18,0};
+    u8 result[18];
+    int r = DoSCSI(device,cmd,6,DEVICE_TO_HOST,result,18);
+    return r;
+}
+
+int SCSIInquiry(int device)
+{
+    u8 cmd[6] = {0x12,0,0,0,36,0};
+    u8 result[36+2];
+    result[36] = '\n';
+    result[37] = 0;
+    int r = DoSCSI(device,cmd,6,DEVICE_TO_HOST,result,36);
+    if (r == 0)
+        printf((const char*)result + 8);
+    return r;
+}
+
+int SCSIReadCapacity(int device, u32* blockCount, u32* blockSize)
+{
+    u8 cmd[10] = {0x25,0,0,0,8,0,0,0,0,0};
+    u8 result[8];
+    *blockSize = 0;
+    *blockCount = 0;
+    int r = DoSCSI(device,cmd,10,DEVICE_TO_HOST,result,8);
+    if (r == 0)
+    {
+        *blockCount = BE32(result);
+        *blockSize = BE32(result+4);
+    }
+    return r;
+}
+
+int SCSITransfer(int device, u32 blockAddr, u32 blockCount, u8* dst, u32 blockSize, int direction)
+{
+    //  USB hardware will only do 4k per transfer
+    while (blockCount*blockSize > 4096)
+    {
+        int count = 4096/blockSize;
+        int r = SCSITransfer(device,blockAddr,count,dst,blockSize,direction);
+        dst += count*blockSize;
+        blockAddr += count;
+        blockCount -= count;
+    }
+
+    u8 cmd[10];
+    memset(cmd,0,10);
+    cmd[0] = (direction == DEVICE_TO_HOST) ? 0x28 : 0x2A;
+    BE32(blockAddr,cmd+2);
+    BE16(blockCount,cmd+7);
+    return DoSCSI(device,cmd,10,direction,dst,blockSize*blockCount);
+}
+
+int MassStorage_ReadCapacity(int device, u32* blockCount, u32* blockSize)
+{
+    return SCSIReadCapacity(device,blockCount,blockSize);
+}
+
+int MassStorage_Read(int device, u32 blockAddr, u32 blockCount, u8* dst, u32 blockSize = 512)
+{
+    return SCSITransfer(device,blockAddr,blockCount,dst,blockSize,DEVICE_TO_HOST);
+}
+
+int MassStorage_Write(int device, u32 blockAddr, u32 blockCount, u8* dst, u32 blockSize = 512)
+{
+    return SCSITransfer(device,blockAddr,blockCount,dst,blockSize,HOST_TO_DEVICE);
+}