drivers/ide/pci/it8213.c

   1 /*
   2  * ITE 8213 IDE driver
   3  *
   4  * Copyright (C) 2006 Jack Lee
   5  * Copyright (C) 2006 Alan Cox
   6  * Copyright (C) 2007 Bartlomiej Zolnierkiewicz
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/types.h>
  11 #include <linux/module.h>
  12 #include <linux/pci.h>
  13 #include <linux/delay.h>
  14 #include <linux/hdreg.h>
  15 #include <linux/ide.h>
  16 #include <linux/init.h>
  17
  18 #include <asm/io.h>
  19
  20 /**
  21  *      it8213_dma_2_pio                -       return the PIO mode matching DMA
  22  *      @xfer_rate: transfer speed
  23  *
  24  *      Returns the nearest equivalent PIO timing for the DMA
  25  *      mode requested by the controller.
  26  */
  27
  28 static u8 it8213_dma_2_pio (u8 xfer_rate) {
  29         switch(xfer_rate) {
  30                 case XFER_UDMA_6:
  31                 case XFER_UDMA_5:
  32                 case XFER_UDMA_4:
  33                 case XFER_UDMA_3:
  34                 case XFER_UDMA_2:
  35                 case XFER_UDMA_1:
  36                 case XFER_UDMA_0:
  37                 case XFER_MW_DMA_2:
  38                         return 4;
  39                 case XFER_MW_DMA_1:
  40                         return 3;
  41                 case XFER_SW_DMA_2:
  42                         return 2;
  43                 case XFER_MW_DMA_0:
  44                 case XFER_SW_DMA_1:
  45                 case XFER_SW_DMA_0:
  46                 default:
  47                         return 0;
  48         }
  49 }
  50
  51 /*
  52  *      it8213_tune_pio -       tune a drive
  53  *      @drive: drive to tune
  54  *      @pio: desired PIO mode
  55  *
  56  *      Set the interface PIO mode.
  57  */
  58
  59 static void it8213_tune_pio(ide_drive_t *drive, const u8 pio)
  60 {
  61         ide_hwif_t *hwif        = HWIF(drive);
  62         struct pci_dev *dev     = hwif->pci_dev;
  63         int is_slave            = drive->dn & 1;
  64         int master_port         = 0x40;
  65         int slave_port          = 0x44;
  66         unsigned long flags;
  67         u16 master_data;
  68         u8 slave_data;
  69         static DEFINE_SPINLOCK(tune_lock);
  70         int control = 0;
  71
  72         static const u8 timings[][2]= {
  73                                         { 0, 0 },
  74                                         { 0, 0 },
  75                                         { 1, 0 },
  76                                         { 2, 1 },
  77                                         { 2, 3 }, };
  78
  79         spin_lock_irqsave(&tune_lock, flags);
  80         pci_read_config_word(dev, master_port, &master_data);
  81
  82         if (pio > 1)
  83                 control |= 1;   /* Programmable timing on */
  84         if (drive->media != ide_disk)
  85                 control |= 4;   /* ATAPI */
  86         if (pio > 2)
  87                 control |= 2;   /* IORDY */
  88         if (is_slave) {
  89                 master_data |=  0x4000;
  90                 master_data &= ~0x0070;
  91                 if (pio > 1)
  92                         master_data = master_data | (control << 4);
  93                 pci_read_config_byte(dev, slave_port, &slave_data);
  94                 slave_data = slave_data & 0xf0;
  95                 slave_data = slave_data | (timings[pio][0] << 2) | timings[pio][1];
  96         } else {
  97                 master_data &= ~0x3307;
  98                 if (pio > 1)
  99                         master_data = master_data | control;
 100                 master_data = master_data | (timings[pio][0] << 12) | (timings[pio][1] << 8);
 101         }
 102         pci_write_config_word(dev, master_port, master_data);
 103         if (is_slave)
 104                 pci_write_config_byte(dev, slave_port, slave_data);
 105         spin_unlock_irqrestore(&tune_lock, flags);
 106 }
 107
 108 static void it8213_tuneproc(ide_drive_t *drive, u8 pio)
 109 {
 110         pio = ide_get_best_pio_mode(drive, pio, 4);
 111         it8213_tune_pio(drive, pio);
 112         ide_config_drive_speed(drive, XFER_PIO_0 + pio);
 113 }
 114
 115 /**
 116  *      it8213_tune_chipset     -       set controller timings
 117  *      @drive: Drive to set up
 118  *      @xferspeed: speed we want to achieve
 119  *
 120  *      Tune the ITE chipset for the desired mode. If we can't achieve
 121  *      the desired mode then tune for a lower one, but ultimately
 122  *      make the thing work.
 123  */
 124
 125 static int it8213_tune_chipset (ide_drive_t *drive, u8 xferspeed)
 126 {
 127
 128         ide_hwif_t *hwif        = HWIF(drive);
 129         struct pci_dev *dev     = hwif->pci_dev;
 130         u8 maslave              = 0x40;
 131         u8 speed                = ide_rate_filter(drive, xferspeed);
 132         int a_speed             = 3 << (drive->dn * 4);
 133         int u_flag              = 1 << drive->dn;
 134         int v_flag              = 0x01 << drive->dn;
 135         int w_flag              = 0x10 << drive->dn;
 136         int u_speed             = 0;
 137         u16                     reg4042, reg4a;
 138         u8                      reg48, reg54, reg55;
 139
 140         pci_read_config_word(dev, maslave, &reg4042);
 141         pci_read_config_byte(dev, 0x48, &reg48);
 142         pci_read_config_word(dev, 0x4a, &reg4a);
 143         pci_read_config_byte(dev, 0x54, &reg54);
 144         pci_read_config_byte(dev, 0x55, &reg55);
 145
 146         switch(speed) {
 147                 case XFER_UDMA_6:
 148                 case XFER_UDMA_4:
 149                 case XFER_UDMA_2:       u_speed = 2 << (drive->dn * 4); break;
 150                 case XFER_UDMA_5:
 151                 case XFER_UDMA_3:
 152                 case XFER_UDMA_1:       u_speed = 1 << (drive->dn * 4); break;
 153                 case XFER_UDMA_0:       u_speed = 0 << (drive->dn * 4); break;
 154                         break;
 155                 case XFER_MW_DMA_2:
 156                 case XFER_MW_DMA_1:
 157                 case XFER_SW_DMA_2:
 158                         break;
 159                 case XFER_PIO_4:
 160                 case XFER_PIO_3:
 161                 case XFER_PIO_2:
 162                 case XFER_PIO_1:
 163                 case XFER_PIO_0:
 164                         break;
 165                 default:
 166                         return -1;
 167         }
 168
 169         if (speed >= XFER_UDMA_0) {
 170                 if (!(reg48 & u_flag))
 171                         pci_write_config_byte(dev, 0x48, reg48 | u_flag);
 172                 if (speed >= XFER_UDMA_5) {
 173                         pci_write_config_byte(dev, 0x55, (u8) reg55|w_flag);
 174                 } else {
 175                         pci_write_config_byte(dev, 0x55, (u8) reg55 & ~w_flag);
 176                 }
 177
 178                 if ((reg4a & a_speed) != u_speed)
 179                         pci_write_config_word(dev, 0x4a, (reg4a & ~a_speed) | u_speed);
 180                 if (speed > XFER_UDMA_2) {
 181                         if (!(reg54 & v_flag))
 182                                 pci_write_config_byte(dev, 0x54, reg54 | v_flag);
 183                 } else
 184                         pci_write_config_byte(dev, 0x54, reg54 & ~v_flag);
 185         } else {
 186                 if (reg48 & u_flag)
 187                         pci_write_config_byte(dev, 0x48, reg48 & ~u_flag);
 188                 if (reg4a & a_speed)
 189                         pci_write_config_word(dev, 0x4a, reg4a & ~a_speed);
 190                 if (reg54 & v_flag)
 191                         pci_write_config_byte(dev, 0x54, reg54 & ~v_flag);
 192                 if (reg55 & w_flag)
 193                         pci_write_config_byte(dev, 0x55, (u8) reg55 & ~w_flag);
 194         }
 195
 196         if (speed > XFER_PIO_4)
 197                 it8213_tune_pio(drive, it8213_dma_2_pio(speed));
 198         else
 199                 it8213_tune_pio(drive, speed - XFER_PIO_0);
 200
 201         return ide_config_drive_speed(drive, speed);
 202 }
 203
 204 /**
 205  *      it8213_configure_drive_for_dma  -       set up for DMA transfers
 206  *      @drive: drive we are going to set up
 207  *
 208  *      Set up the drive for DMA, tune the controller and drive as
 209  *      required. If the drive isn't suitable for DMA or we hit
 210  *      other problems then we will drop down to PIO and set up
 211  *      PIO appropriately
 212  */
 213
 214 static int it8213_config_drive_for_dma (ide_drive_t *drive)
 215 {
 216         if (ide_tune_dma(drive))
 217                 return 0;
 218
 219         it8213_tuneproc(drive, 255);
 220
 221         return -1;
 222 }
 223
 224 /**
 225  *      init_hwif_it8213        -       set up hwif structs
 226  *      @hwif: interface to set up
 227  *
 228  *      We do the basic set up of the interface structure. The IT8212
 229  *      requires several custom handlers so we override the default
 230  *      ide DMA handlers appropriately
 231  */
 232
 233 static void __devinit init_hwif_it8213(ide_hwif_t *hwif)
 234 {
 235         u8 reg42h = 0;
 236
 237         hwif->speedproc = &it8213_tune_chipset;
 238         hwif->tuneproc  = &it8213_tuneproc;
 239
 240         hwif->autodma = 0;
 241
 242         hwif->drives[0].autotune = 1;
 243         hwif->drives[1].autotune = 1;
 244
 245         if (!hwif->dma_base)
 246                 return;
 247
 248         hwif->atapi_dma = 1;
 249         hwif->ultra_mask = 0x7f;
 250         hwif->mwdma_mask = 0x06;
 251         hwif->swdma_mask = 0x04;
 252
 253         pci_read_config_byte(hwif->pci_dev, 0x42, &reg42h);
 254
 255         hwif->ide_dma_check = &it8213_config_drive_for_dma;
 256
 257         if (hwif->cbl != ATA_CBL_PATA40_SHORT)
 258                 hwif->cbl = (reg42h & 0x02) ? ATA_CBL_PATA40 : ATA_CBL_PATA80;
 259
 260         /*
 261          *      The BIOS often doesn't set up DMA on this controller
 262          *      so we always do it.
 263          */
 264         if (!noautodma)
 265                 hwif->autodma = 1;
 266
 267         hwif->drives[0].autodma = hwif->autodma;
 268         hwif->drives[1].autodma = hwif->autodma;
 269 }
 270
 271
 272 #define DECLARE_ITE_DEV(name_str)                       \
 273         {                                               \
 274                 .name           = name_str,             \
 275                 .init_hwif      = init_hwif_it8213,     \
 276                 .autodma        = AUTODMA,              \
 277                 .enablebits     = {{0x41,0x80,0x80}}, \
 278                 .bootable       = ON_BOARD,             \
 279                 .host_flags     = IDE_HFLAG_SINGLE,     \
 280                 .pio_mask       = ATA_PIO4,             \
 281         }
 282
 283 static ide_pci_device_t it8213_chipsets[] __devinitdata = {
 284         /* 0 */ DECLARE_ITE_DEV("IT8213"),
 285 };
 286
 287
 288 /**
 289  *      it8213_init_one -       pci layer discovery entry
 290  *      @dev: PCI device
 291  *      @id: ident table entry
 292  *
 293  *      Called by the PCI code when it finds an ITE8213 controller. As
 294  *      this device follows the standard interfaces we can use the
 295  *      standard helper functions to do almost all the work for us.
 296  */
 297
 298 static int __devinit it8213_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 299 {
 300         ide_setup_pci_device(dev, &it8213_chipsets[id->driver_data]);
 301         return 0;
 302 }
 303
 304
 305 static struct pci_device_id it8213_pci_tbl[] = {
 306         { PCI_VENDOR_ID_ITE, 0x8213, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
 307         { 0, },
 308 };
 309
 310 MODULE_DEVICE_TABLE(pci, it8213_pci_tbl);
 311
 312 static struct pci_driver driver = {
 313         .name           = "ITE8213_IDE",
 314         .id_table       = it8213_pci_tbl,
 315         .probe          = it8213_init_one,
 316 };
 317
 318 static int __init it8213_ide_init(void)
 319 {
 320         return ide_pci_register_driver(&driver);
 321 }
 322
 323 module_init(it8213_ide_init);
 324
 325 MODULE_AUTHOR("Jack Lee, Alan Cox");
 326 MODULE_DESCRIPTION("PCI driver module for the ITE 8213");
 327 MODULE_LICENSE("GPL");