3 * Floppy Disk Access Code
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8 #include <fs_devfs.h>
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9 #include <tpl_drv_disk.h>
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11 #include <iocache.h>
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15 // === CONSTANTS ===
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16 // --- Current Version
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17 #define FDD_VERSION ((0<<8)|(75))
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20 #define FDD_SEEK_TIMEOUT 10 // Timeout for a seek operation
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21 #define MOTOR_ON_DELAY 500 // Miliseconds
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22 #define MOTOR_OFF_DELAY 2000 // Miliseconds
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26 * \brief Representation of a floppy drive
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28 typedef struct sFloppyDrive
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31 volatile int motorState; //2 - On, 1 - Spinup, 0 - Off
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36 tIOCache *CacheHandle;
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41 * \brief Cached Sector
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46 Uint16 sector; // Allows 32Mb of addressable space (Plenty for FDD)
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50 // === CONSTANTS ===
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51 static const char *cFDD_TYPES[] = {"None", "360kB 5.25\"", "1.2MB 5.25\"", "720kB 3.5\"", "1.44MB 3.5\"", "2.88MB 3.5\"" };
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52 static const int cFDD_SIZES[] = { 0, 360*1024, 1200*1024, 720*1024, 1440*1024, 2880*1024 };
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53 static const short cPORTBASE[] = { 0x3F0, 0x370 };
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58 PORT_DIGOUTPUT = 0x2,
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59 PORT_MAINSTATUS = 0x4,
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60 PORT_DATARATE = 0x4,
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62 PORT_DIGINPUT = 0x7,
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63 PORT_CONFIGCTRL = 0x7
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66 enum FloppyCommands {
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67 FIX_DRIVE_DATA = 0x03,
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68 HECK_DRIVE_STATUS = 0x04,
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69 CALIBRATE_DRIVE = 0x07,
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70 CHECK_INTERRUPT_STATUS = 0x08,
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72 READ_SECTOR_ID = 0x4A,
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73 FORMAT_TRACK = 0x4D,
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76 WRITE_SECTOR = 0xC5,
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77 WRITE_DELETE_SECTOR = 0xC9,
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78 READ_DELETE_SECTOR = 0xCC,
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81 // === PROTOTYPES ===
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83 int FDD_Install(char **Arguments);
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84 void FDD_UnloadModule();
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86 char *FDD_ReadDir(tVFS_Node *Node, int pos);
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87 tVFS_Node *FDD_FindDir(tVFS_Node *dirNode, char *Name);
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88 int FDD_IOCtl(tVFS_Node *Node, int ID, void *Data);
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89 Uint64 FDD_ReadFS(tVFS_Node *node, Uint64 off, Uint64 len, void *buffer);
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90 // --- Functions for IOCache/DrvUtil
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91 Uint FDD_ReadSectors(Uint64 SectorAddr, Uint Count, void *Buffer, Uint Disk);
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92 // --- Raw Disk Access
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93 int FDD_ReadSector(Uint32 disk, Uint64 lba, void *Buffer);
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94 int FDD_WriteSector(Uint32 Disk, Uint64 LBA, void *Buffer);
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96 void FDD_IRQHandler(int Num);
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97 inline void FDD_WaitIRQ();
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98 void FDD_SensInt(int base, Uint8 *sr0, Uint8 *cyl);
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99 void FDD_int_SendByte(int base, char byte);
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100 int FDD_int_GetByte(int base);
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101 void FDD_Reset(int id);
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102 void FDD_Recalibrate(int disk);
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103 int FDD_int_SeekTrack(int disk, int head, int track);
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104 void FDD_int_TimerCallback(int arg);
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105 void FDD_int_StopMotor(int disk);
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106 void FDD_int_StartMotor(int disk);
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107 int FDD_int_GetDims(int type, int lba, int *c, int *h, int *s, int *spt);
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110 MODULE_DEFINE(0, FDD_VERSION, FDD, FDD_Install, NULL, NULL);
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111 t_floppyDevice gFDD_Devices[2];
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113 volatile int gbFDD_IrqFired = 0;
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114 tDevFS_Driver gFDD_DriverInfo = {
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119 .ACLs = &gVFS_ACL_EveryoneRX,
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120 .Flags = VFS_FFLAG_DIRECTORY,
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121 .ReadDir = FDD_ReadDir,
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122 .FindDir = FDD_FindDir,
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129 * \fn int FDD_Install(char **Arguments)
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130 * \brief Installs floppy driver
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132 int FDD_Install(char **Arguments)
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136 // Determine Floppy Types (From CMOS)
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139 gFDD_Devices[0].type = data >> 4;
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140 gFDD_Devices[1].type = data & 0xF;
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141 gFDD_Devices[0].track[0] = -1;
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142 gFDD_Devices[1].track[1] = -1;
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144 Log("[FDD ] Detected Disk 0: %s and Disk 1: %s", cFDD_TYPES[data>>4], cFDD_TYPES[data&0xF]);
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146 // Clear FDD IRQ Flag
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147 FDD_SensInt(0x3F0, NULL, NULL);
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148 // Install IRQ6 Handler
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149 IRQ_AddHandler(6, FDD_IRQHandler);
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150 // Reset Primary FDD Controller
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153 // Initialise Root Node
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154 gFDD_DriverInfo.RootNode.CTime = gFDD_DriverInfo.RootNode.MTime
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155 = gFDD_DriverInfo.RootNode.ATime = now();
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157 // Initialise Child Nodes
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158 gFDD_Devices[0].Node.Inode = 0;
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159 gFDD_Devices[0].Node.Flags = 0;
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160 gFDD_Devices[0].Node.NumACLs = 0;
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161 gFDD_Devices[0].Node.Read = FDD_ReadFS;
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162 gFDD_Devices[0].Node.Write = NULL;//FDD_WriteFS;
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163 memcpy(&gFDD_Devices[1].Node, &gFDD_Devices[0].Node, sizeof(tVFS_Node));
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165 gFDD_Devices[1].Node.Inode = 1;
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168 gFDD_Devices[0].Node.Size = cFDD_SIZES[data >> 4];
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169 gFDD_Devices[1].Node.Size = cFDD_SIZES[data & 0xF];
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171 // Create Sector Cache
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172 if( cFDD_SIZES[data >> 4] )
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174 gFDD_Devices[0].CacheHandle = IOCache_Create(
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175 FDD_WriteSector, 0, 512,
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176 gFDD_Devices[0].Node.Size / (512*4)
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177 ); // Cache is 1/4 the size of the disk
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179 if( cFDD_SIZES[data & 15] )
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181 gFDD_Devices[1].CacheHandle = IOCache_Create(
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182 FDD_WriteSector, 0, 512,
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183 gFDD_Devices[1].Node.Size / (512*4)
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184 ); // Cache is 1/4 the size of the disk
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187 // Register with devfs
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188 DevFS_AddDevice(&gFDD_DriverInfo);
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190 return MODULE_ERR_OK;
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194 * \brief Prepare the module for removal
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196 void FDD_UnloadModule()
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199 //DevFS_DelDevice( &gFDD_DriverInfo );
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202 Time_RemoveTimer(gFDD_Devices[i].timer);
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203 FDD_int_StopMotor(i);
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210 * \fn char *FDD_ReadDir(tVFS_Node *Node, int pos)
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211 * \brief Read Directory
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213 char *FDD_ReadDir(tVFS_Node *Node, int Pos)
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215 char name[2] = "0\0";
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217 if(Pos >= 2 || Pos < 0) return NULL;
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219 if(gFDD_Devices[Pos].type == 0) return VFS_SKIP;
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223 return strdup(name);
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227 * \fn tVFS_Node *FDD_FindDir(tVFS_Node *Node, char *filename);
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228 * \brief Find File Routine (for vfs_node)
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230 tVFS_Node *FDD_FindDir(tVFS_Node *Node, char *Filename)
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234 ENTER("sFilename", Filename);
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236 // Sanity check string
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237 if(Filename == NULL) {
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242 // Check string length (should be 1)
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243 if(Filename[0] == '\0' || Filename[1] != '\0') {
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248 // Get First character
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249 i = Filename[0] - '0';
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251 // Check for 1st disk and if it is present return
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252 if(i == 0 && gFDD_Devices[0].type != 0) {
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253 LEAVE('p', &gFDD_Devices[0].Node);
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254 return &gFDD_Devices[0].Node;
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257 // Check for 2nd disk and if it is present return
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258 if(i == 1 && gFDD_Devices[1].type != 0) {
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259 LEAVE('p', &gFDD_Devices[1].Node);
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260 return &gFDD_Devices[1].Node;
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263 // Else return null
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268 static const char *casIOCTLS[] = {DRV_IOCTLNAMES,DRV_DISK_IOCTLNAMES,NULL};
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270 * \fn int FDD_IOCtl(tVFS_Node *Node, int id, void *data)
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271 * \brief Stub ioctl function
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273 int FDD_IOCtl(tVFS_Node *Node, int ID, void *Data)
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277 case DRV_IOCTL_TYPE: return DRV_TYPE_DISK;
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278 case DRV_IOCTL_IDENT: return ModUtil_SetIdent(Data, "FDD");
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279 case DRV_IOCTL_VERSION: return FDD_VERSION;
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280 case DRV_IOCTL_LOOKUP: return ModUtil_LookupString((char**)casIOCTLS, Data);
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282 case DISK_IOCTL_GETBLOCKSIZE: return 512;
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290 * \fn Uint64 FDD_ReadFS(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
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291 * \brief Read Data from a disk
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293 Uint64 FDD_ReadFS(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
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297 ENTER("pNode XOffset XLength pBuffer", Node, Offset, Length, Buffer);
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304 if(Node->Inode != 0 && Node->Inode != 1) {
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309 ret = DrvUtil_ReadBlock(Offset, Length, Buffer, FDD_ReadSectors, 512, Node->Inode);
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315 * \brief Reads \a Count contiguous sectors from a disk
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316 * \param SectorAddr Address of the first sector
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317 * \param Count Number of sectors to read
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318 * \param Buffer Destination Buffer
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319 * \param Disk Disk Number
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320 * \return Number of sectors read
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321 * \note Used as a ::DrvUtil_ReadBlock helper
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323 Uint FDD_ReadSectors(Uint64 SectorAddr, Uint Count, void *Buffer, Uint Disk)
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328 if( FDD_ReadSector(Disk, SectorAddr, Buffer) != 1 )
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331 Buffer = (void*)( (tVAddr)Buffer + 512 );
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339 * \fn int FDD_ReadSector(Uint32 Disk, Uint64 SectorAddr, void *Buffer)
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340 * \brief Read a sector from disk
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341 * \todo Make real-hardware safe (account for read errors)
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343 int FDD_ReadSector(Uint32 Disk, Uint64 SectorAddr, void *Buffer)
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345 int cyl, head, sec;
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348 int lba = SectorAddr;
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350 ENTER("iDisk XSectorAddr pBuffer", disk, SectorAddr, Buffer);
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353 FDD_AquireCacheSpinlock();
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354 for( i = 0; i < siFDD_SectorCacheSize; i++ )
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356 if(sFDD_SectorCache[i].timestamp == 0) continue;
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357 if( sFDD_SectorCache[i].disk == Disk
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358 && sFDD_SectorCache[i].sector == lba)
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360 LOG("Found %i in cache %i", lba, i);
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361 memcpy(Buffer, sFDD_SectorCache[i].data, 512);
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362 sFDD_SectorCache[i].timestamp = now();
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363 FDD_FreeCacheSpinlock();
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368 LOG("Read %i from Disk", lba);
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369 FDD_FreeCacheSpinlock();
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371 if( IOCache_Read( gFDD_Devices[Disk].CacheHandle, SectorAddr, Buffer ) == 1 ) {
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377 base = cPORTBASE[Disk >> 1];
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379 LOG("Calculating Disk Dimensions");
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380 // Get CHS position
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381 if(FDD_int_GetDims(gFDD_Devices[Disk].type, lba, &cyl, &head, &sec, &spt) != 1)
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387 // Remove Old Timer
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388 Time_RemoveTimer(gFDD_Devices[Disk].timer);
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389 // Check if Motor is on
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390 if(gFDD_Devices[Disk].motorState == 0) FDD_int_StartMotor(Disk);
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392 LOG("Wait for the motor to spin up");
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395 while(gFDD_Devices[Disk].motorState == 1) Threads_Yield();
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397 LOG("Cyl=%i, Head=%i, Sector=%i", cyl, head, sec);
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398 LOG("Acquire Spinlock");
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403 outb(base + CALIBRATE_DRIVE, 0);
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405 while(FDD_int_SeekTrack(Disk, head, (Uint8)cyl) == 0 && i++ < FDD_SEEK_TIMEOUT )
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407 if( i > FDD_SEEK_TIMEOUT ) {
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411 //FDD_SensInt(base, NULL, NULL); // Wait for IRQ
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413 // Read Data from DMA
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414 LOG("Setting DMA for read");
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415 DMA_SetChannel(2, 512, 1); // Read 512 Bytes from channel 2
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417 LOG("Sending read command");
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419 //Threads_Wait(100); // Wait for Head to settle
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421 FDD_int_SendByte(base, READ_SECTOR); // Was 0xE6
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422 FDD_int_SendByte(base, (head << 2) | (Disk&1));
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423 FDD_int_SendByte(base, (Uint8)cyl);
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424 FDD_int_SendByte(base, (Uint8)head);
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425 FDD_int_SendByte(base, (Uint8)sec);
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426 FDD_int_SendByte(base, 0x02); // Bytes Per Sector (Real BPS=128*2^{val})
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427 FDD_int_SendByte(base, spt); // SPT
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428 FDD_int_SendByte(base, 0x1B); // Gap Length (27 is default)
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429 FDD_int_SendByte(base, 0xFF); // Data Length
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432 LOG("Waiting for Data to be read");
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435 // Read Data from DMA
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436 LOG(" FDD_ReadSector: Reading Data");
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437 DMA_ReadData(2, 512, Buffer);
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439 // Clear Input Buffer
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440 LOG("Clearing Input Buffer");
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441 FDD_int_GetByte(base); FDD_int_GetByte(base); FDD_int_GetByte(base);
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442 FDD_int_GetByte(base); FDD_int_GetByte(base); FDD_int_GetByte(base); FDD_int_GetByte(base);
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444 // Release Spinlock
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445 LOG("Realeasing Spinlock and setting motor to stop");
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448 // Don't turn the motor off now, wait for a while
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449 gFDD_Devices[Disk].timer = Time_CreateTimer(MOTOR_OFF_DELAY, FDD_int_StopMotor, (void*)Disk);
451 IOCache_Add( gFDD_Devices[Disk].CacheHandle, SectorAddr, Buffer );
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458 * \fn int FDD_WriteSector(Uint32 Disk, Uint64 LBA, void *Buffer)
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459 * \brief Write a sector to the floppy disk
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460 * \note Not Implemented
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462 int FDD_WriteSector(Uint32 Disk, Uint64 LBA, void *Buffer)
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464 Warning("[FDD ] Read Only at the moment");
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469 * \fn int FDD_int_SeekTrack(int disk, int track)
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470 * \brief Seek disk to selected track
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472 int FDD_int_SeekTrack(int disk, int head, int track)
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477 base = cPORTBASE[disk>>1];
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479 // Check if seeking is needed
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480 if(gFDD_Devices[disk].track[head] == track)
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484 FDD_int_SendByte(base, SEEK_TRACK);
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485 FDD_int_SendByte(base, (head<<2)|(disk&1));
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486 FDD_int_SendByte(base, track); // Send Seek command
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488 FDD_SensInt(base, &sr0, &cyl); // Wait for IRQ
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489 if((sr0 & 0xF0) != 0x20) {
490 LOG("sr0 = 0x%x", sr0);
491 return 0; //Check Status
493 if(cyl != track) return 0;
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495 // Set Track in structure
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496 gFDD_Devices[disk].track[head] = track;
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501 * \fn int FDD_int_GetDims(int type, int lba, int *c, int *h, int *s, int *spt)
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502 * \brief Get Dimensions of a disk
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504 int FDD_int_GetDims(int type, int lba, int *c, int *h, int *s, int *spt)
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513 *s = (lba % 9) + 1;
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515 *h = (lba / 9) & 1;
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521 *s = (lba % 15) + 1;
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523 *h = (lba / 15) & 1;
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529 *s = (lba % 9) + 1;
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531 *h = (lba / 9) & 1;
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537 *s = (lba % 18) + 1;
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539 *h = (lba / 18) & 1;
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540 //Log("1440k - lba=%i(0x%x), *s=%i,*c=%i,*h=%i", lba, lba, *s, *c, *h);
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546 *s = (lba % 36) + 1;
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548 *h = (lba / 32) & 1;
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558 * \fn void FDD_IRQHandler(int Num)
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559 * \brief Handles IRQ6
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561 void FDD_IRQHandler(int Num)
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563 gbFDD_IrqFired = 1;
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567 * \fn FDD_WaitIRQ()
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568 * \brief Wait for an IRQ6
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570 inline void FDD_WaitIRQ()
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573 while(!gbFDD_IrqFired) Threads_Yield();
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574 gbFDD_IrqFired = 0;
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577 void FDD_SensInt(int base, Uint8 *sr0, Uint8 *cyl)
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579 FDD_int_SendByte(base, CHECK_INTERRUPT_STATUS);
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580 if(sr0) *sr0 = FDD_int_GetByte(base);
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581 else FDD_int_GetByte(base);
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582 if(cyl) *cyl = FDD_int_GetByte(base);
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583 else FDD_int_GetByte(base);
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587 * void FDD_int_SendByte(int base, char byte)
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588 * \brief Sends a command to the controller
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590 void FDD_int_SendByte(int base, char byte)
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592 volatile int state;
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594 for( ; timeout--; )
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596 state = inb(base + PORT_MAINSTATUS);
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597 if ((state & 0xC0) == 0x80)
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599 outb(base + PORT_DATA, byte);
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606 Warning("FDD_int_SendByte - Timeout sending byte 0x%x to base 0x%x\n", byte, base);
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611 * int FDD_int_GetByte(int base, char byte)
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612 * \brief Receive data from fdd controller
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614 int FDD_int_GetByte(int base)
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616 volatile int state;
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618 for( timeout = 128; timeout--; )
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620 state = inb((base + PORT_MAINSTATUS));
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621 if ((state & 0xd0) == 0xd0)
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622 return inb(base + PORT_DATA);
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629 * \brief Recalibrate the specified disk
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631 void FDD_Recalibrate(int disk)
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633 ENTER("idisk", disk);
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635 LOG("Starting Motor");
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636 FDD_int_StartMotor(disk);
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638 while(gFDD_Devices[disk].motorState == 1) Threads_Yield();
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640 LOG("Sending Calibrate Command");
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641 FDD_int_SendByte(cPORTBASE[disk>>1], CALIBRATE_DRIVE);
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642 FDD_int_SendByte(cPORTBASE[disk>>1], disk&1);
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644 LOG("Waiting for IRQ");
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646 FDD_SensInt(cPORTBASE[disk>>1], NULL, NULL);
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648 LOG("Stopping Motor");
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649 FDD_int_StopMotor(disk);
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654 * \brief Reset the specified FDD controller
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656 void FDD_Reset(int id)
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658 int base = cPORTBASE[id];
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662 outb(base + PORT_DIGOUTPUT, 0); // Stop Motors & Disable FDC
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663 outb(base + PORT_DIGOUTPUT, 0x0C); // Re-enable FDC (DMA and Enable)
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665 LOG("Awaiting IRQ");
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668 FDD_SensInt(base, NULL, NULL);
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670 LOG("Setting Driver Info");
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671 outb(base + PORT_DATARATE, 0); // Set data rate to 500K/s
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672 FDD_int_SendByte(base, FIX_DRIVE_DATA); // Step and Head Load Times
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673 FDD_int_SendByte(base, 0xDF); // Step Rate Time, Head Unload Time (Nibble each)
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674 FDD_int_SendByte(base, 0x02); // Head Load Time >> 1
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675 while(FDD_int_SeekTrack(0, 0, 1) == 0); // set track
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676 while(FDD_int_SeekTrack(0, 1, 1) == 0); // set track
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678 LOG("Recalibrating Disk");
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679 FDD_Recalibrate((id<<1)|0);
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680 FDD_Recalibrate((id<<1)|1);
686 * \fn void FDD_int_TimerCallback()
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687 * \brief Called by timer
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689 void FDD_int_TimerCallback(int arg)
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691 ENTER("iarg", arg);
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692 if(gFDD_Devices[arg].motorState == 1)
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693 gFDD_Devices[arg].motorState = 2;
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694 Time_RemoveTimer(gFDD_Devices[arg].timer);
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695 gFDD_Devices[arg].timer = -1;
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700 * \fn void FDD_int_StartMotor(char disk)
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701 * \brief Starts FDD Motor
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703 void FDD_int_StartMotor(int disk)
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706 state = inb( cPORTBASE[ disk>>1 ] + PORT_DIGOUTPUT );
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707 state |= 1 << (4+disk);
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708 outb( cPORTBASE[ disk>>1 ] + PORT_DIGOUTPUT, state );
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709 gFDD_Devices[disk].motorState = 1;
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710 gFDD_Devices[disk].timer = Time_CreateTimer(MOTOR_ON_DELAY, FDD_int_TimerCallback, (void*)disk);
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714 * \fn void FDD_int_StopMotor(int disk)
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715 * \brief Stops FDD Motor
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717 void FDD_int_StopMotor(int disk)
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720 state = inb( cPORTBASE[ disk>>1 ] + PORT_DIGOUTPUT );
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721 state &= ~( 1 << (4+disk) );
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722 outb( cPORTBASE[ disk>>1 ] + PORT_DIGOUTPUT, state );
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723 gFDD_Devices[disk].motorState = 0;
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