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_ratemask -       Compute available modes
  22  *      @drive: IDE drive
  23  *
  24  *      Compute the available speeds for the devices on the interface. This
  25  *      is all modes to ATA133 clipped by drive cable setup.
  26  */
  27
  28 static u8 it8213_ratemask (ide_drive_t *drive)
  29 {
  30         u8 mode = 4;
  31         if (!eighty_ninty_three(drive))
  32                 mode = min_t(u8, mode, 1);
  33         return mode;
  34 }
  35
  36 /**
  37  *      it8213_dma_2_pio                -       return the PIO mode matching DMA
  38  *      @xfer_rate: transfer speed
  39  *
  40  *      Returns the nearest equivalent PIO timing for the PIO or DMA
  41  *      mode requested by the controller.
  42  */
  43
  44 static u8 it8213_dma_2_pio (u8 xfer_rate) {
  45         switch(xfer_rate) {
  46                 case XFER_UDMA_6:
  47                 case XFER_UDMA_5:
  48                 case XFER_UDMA_4:
  49                 case XFER_UDMA_3:
  50                 case XFER_UDMA_2:
  51                 case XFER_UDMA_1:
  52                 case XFER_UDMA_0:
  53                 case XFER_MW_DMA_2:
  54                 case XFER_PIO_4:
  55                         return 4;
  56                 case XFER_MW_DMA_1:
  57                 case XFER_PIO_3:
  58                         return 3;
  59                 case XFER_SW_DMA_2:
  60                 case XFER_PIO_2:
  61                         return 2;
  62                 case XFER_MW_DMA_0:
  63                 case XFER_SW_DMA_1:
  64                 case XFER_SW_DMA_0:
  65                 case XFER_PIO_1:
  66                 case XFER_PIO_0:
  67                 case XFER_PIO_SLOW:
  68                 default:
  69                         return 0;
  70         }
  71 }
  72
  73 /*
  74  *      it8213_tuneproc -       tune a drive
  75  *      @drive: drive to tune
  76  *      @pio: desired PIO mode
  77  *
  78  *      Set the interface PIO mode.
  79  */
  80
  81 static void it8213_tuneproc (ide_drive_t *drive, u8 pio)
  82 {
  83         ide_hwif_t *hwif        = HWIF(drive);
  84         struct pci_dev *dev     = hwif->pci_dev;
  85         int is_slave            = drive->dn & 1;
  86         int master_port         = 0x40;
  87         int slave_port          = 0x44;
  88         unsigned long flags;
  89         u16 master_data;
  90         u8 slave_data;
  91         static DEFINE_SPINLOCK(tune_lock);
  92         int control = 0;
  93
  94         static const u8 timings[][2]= {
  95                                         { 0, 0 },
  96                                         { 0, 0 },
  97                                         { 1, 0 },
  98                                         { 2, 1 },
  99                                         { 2, 3 }, };
 100
 101         pio = ide_get_best_pio_mode(drive, pio, 4, NULL);
 102
 103         spin_lock_irqsave(&tune_lock, flags);
 104         pci_read_config_word(dev, master_port, &master_data);
 105
 106         if (pio > 1)
 107                 control |= 1;   /* Programmable timing on */
 108         if (drive->media != ide_disk)
 109                 control |= 4;   /* ATAPI */
 110         if (pio > 2)
 111                 control |= 2;   /* IORDY */
 112         if (is_slave) {
 113                 master_data |=  0x4000;
 114                 master_data &= ~0x0070;
 115                 if (pio > 1)
 116                         master_data = master_data | (control << 4);
 117                 pci_read_config_byte(dev, slave_port, &slave_data);
 118                 slave_data = slave_data & 0xf0;
 119                 slave_data = slave_data | (timings[pio][0] << 2) | timings[pio][1];
 120         } else {
 121                 master_data &= ~0x3307;
 122                 if (pio > 1)
 123                         master_data = master_data | control;
 124                 master_data = master_data | (timings[pio][0] << 12) | (timings[pio][1] << 8);
 125         }
 126         pci_write_config_word(dev, master_port, master_data);
 127         if (is_slave)
 128                 pci_write_config_byte(dev, slave_port, slave_data);
 129         spin_unlock_irqrestore(&tune_lock, flags);
 130 }
 131
 132 /**
 133  *      it8213_tune_chipset     -       set controller timings
 134  *      @drive: Drive to set up
 135  *      @xferspeed: speed we want to achieve
 136  *
 137  *      Tune the ITE chipset for the desired mode. If we can't achieve
 138  *      the desired mode then tune for a lower one, but ultimately
 139  *      make the thing work.
 140  */
 141
 142 static int it8213_tune_chipset (ide_drive_t *drive, u8 xferspeed)
 143 {
 144
 145         ide_hwif_t *hwif        = HWIF(drive);
 146         struct pci_dev *dev     = hwif->pci_dev;
 147         u8 maslave              = 0x40;
 148         u8 speed                = ide_rate_filter(it8213_ratemask(drive), xferspeed);
 149         int a_speed             = 3 << (drive->dn * 4);
 150         int u_flag              = 1 << drive->dn;
 151         int v_flag              = 0x01 << drive->dn;
 152         int w_flag              = 0x10 << drive->dn;
 153         int u_speed             = 0;
 154         u16                     reg4042, reg4a;
 155         u8                      reg48, reg54, reg55;
 156
 157         pci_read_config_word(dev, maslave, &reg4042);
 158         pci_read_config_byte(dev, 0x48, &reg48);
 159         pci_read_config_word(dev, 0x4a, &reg4a);
 160         pci_read_config_byte(dev, 0x54, &reg54);
 161         pci_read_config_byte(dev, 0x55, &reg55);
 162
 163         switch(speed) {
 164                 case XFER_UDMA_6:
 165                 case XFER_UDMA_4:
 166                 case XFER_UDMA_2:       u_speed = 2 << (drive->dn * 4); break;
 167                 case XFER_UDMA_5:
 168                 case XFER_UDMA_3:
 169                 case XFER_UDMA_1:       u_speed = 1 << (drive->dn * 4); break;
 170                 case XFER_UDMA_0:       u_speed = 0 << (drive->dn * 4); break;
 171                         break;
 172                 case XFER_MW_DMA_2:
 173                 case XFER_MW_DMA_1:
 174                 case XFER_SW_DMA_2:
 175                         break;
 176                 case XFER_PIO_4:
 177                 case XFER_PIO_3:
 178                 case XFER_PIO_2:
 179                 case XFER_PIO_1:
 180                 case XFER_PIO_0:
 181                         break;
 182                 default:
 183                         return -1;
 184         }
 185
 186         if (speed >= XFER_UDMA_0) {
 187                 if (!(reg48 & u_flag))
 188                         pci_write_config_byte(dev, 0x48, reg48 | u_flag);
 189                 if (speed >= XFER_UDMA_5) {
 190                         pci_write_config_byte(dev, 0x55, (u8) reg55|w_flag);
 191                 } else {
 192                         pci_write_config_byte(dev, 0x55, (u8) reg55 & ~w_flag);
 193                 }
 194
 195                 if ((reg4a & a_speed) != u_speed)
 196                         pci_write_config_word(dev, 0x4a, (reg4a & ~a_speed) | u_speed);
 197                 if (speed > XFER_UDMA_2) {
 198                         if (!(reg54 & v_flag))
 199                                 pci_write_config_byte(dev, 0x54, reg54 | v_flag);
 200                 } else
 201                         pci_write_config_byte(dev, 0x54, reg54 & ~v_flag);
 202         } else {
 203                 if (reg48 & u_flag)
 204                         pci_write_config_byte(dev, 0x48, reg48 & ~u_flag);
 205                 if (reg4a & a_speed)
 206                         pci_write_config_word(dev, 0x4a, reg4a & ~a_speed);
 207                 if (reg54 & v_flag)
 208                         pci_write_config_byte(dev, 0x54, reg54 & ~v_flag);
 209                 if (reg55 & w_flag)
 210                         pci_write_config_byte(dev, 0x55, (u8) reg55 & ~w_flag);
 211         }
 212         it8213_tuneproc(drive, it8213_dma_2_pio(speed));
 213         return ide_config_drive_speed(drive, speed);
 214 }
 215
 216 /*
 217  *      config_chipset_for_dma  -       configure for DMA
 218  *      @drive: drive to configure
 219  *
 220  *      Called by the IDE layer when it wants the timings set up.
 221  */
 222
 223 static int config_chipset_for_dma (ide_drive_t *drive)
 224 {
 225         u8 speed = ide_dma_speed(drive, it8213_ratemask(drive));
 226
 227         if (!speed)
 228                 return 0;
 229
 230         it8213_tune_chipset(drive, speed);
 231
 232         return ide_dma_enable(drive);
 233 }
 234
 235 /**
 236  *      it8213_configure_drive_for_dma  -       set up for DMA transfers
 237  *      @drive: drive we are going to set up
 238  *
 239  *      Set up the drive for DMA, tune the controller and drive as
 240  *      required. If the drive isn't suitable for DMA or we hit
 241  *      other problems then we will drop down to PIO and set up
 242  *      PIO appropriately
 243  */
 244
 245 static int it8213_config_drive_for_dma (ide_drive_t *drive)
 246 {
 247         u8 pio;
 248
 249         if (ide_use_dma(drive) && config_chipset_for_dma(drive))
 250                 return 0;
 251
 252         pio = ide_get_best_pio_mode(drive, 255, 4, NULL);
 253         it8213_tune_chipset(drive, XFER_PIO_0 + pio);
 254
 255         return -1;
 256 }
 257
 258 /**
 259  *      init_hwif_it8213        -       set up hwif structs
 260  *      @hwif: interface to set up
 261  *
 262  *      We do the basic set up of the interface structure. The IT8212
 263  *      requires several custom handlers so we override the default
 264  *      ide DMA handlers appropriately
 265  */
 266
 267 static void __devinit init_hwif_it8213(ide_hwif_t *hwif)
 268 {
 269         u8 reg42h = 0, ata66 = 0;
 270
 271         hwif->speedproc = &it8213_tune_chipset;
 272         hwif->tuneproc  = &it8213_tuneproc;
 273
 274         hwif->autodma = 0;
 275
 276         hwif->drives[0].autotune = 1;
 277         hwif->drives[1].autotune = 1;
 278
 279         if (!hwif->dma_base)
 280                 return;
 281
 282         hwif->atapi_dma = 1;
 283         hwif->ultra_mask = 0x7f;
 284         hwif->mwdma_mask = 0x06;
 285         hwif->swdma_mask = 0x04;
 286
 287         pci_read_config_byte(hwif->pci_dev, 0x42, &reg42h);
 288         ata66 = (reg42h & 0x02) ? 0 : 1;
 289
 290         hwif->ide_dma_check = &it8213_config_drive_for_dma;
 291         if (!(hwif->udma_four))
 292                 hwif->udma_four = ata66;
 293
 294         /*
 295          *      The BIOS often doesn't set up DMA on this controller
 296          *      so we always do it.
 297          */
 298         if (!noautodma)
 299                 hwif->autodma = 1;
 300
 301         hwif->drives[0].autodma = hwif->autodma;
 302         hwif->drives[1].autodma = hwif->autodma;
 303 }
 304
 305
 306 #define DECLARE_ITE_DEV(name_str)                       \
 307         {                                               \
 308                 .name           = name_str,             \
 309                 .init_hwif      = init_hwif_it8213,     \
 310                 .channels       = 1,                    \
 311                 .autodma        = AUTODMA,              \
 312                 .enablebits     = {{0x41,0x80,0x80}}, \
 313                 .bootable       = ON_BOARD,             \
 314         }
 315
 316 static ide_pci_device_t it8213_chipsets[] __devinitdata = {
 317         /* 0 */ DECLARE_ITE_DEV("IT8213"),
 318 };
 319
 320
 321 /**
 322  *      it8213_init_one -       pci layer discovery entry
 323  *      @dev: PCI device
 324  *      @id: ident table entry
 325  *
 326  *      Called by the PCI code when it finds an ITE8213 controller. As
 327  *      this device follows the standard interfaces we can use the
 328  *      standard helper functions to do almost all the work for us.
 329  */
 330
 331 static int __devinit it8213_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 332 {
 333         ide_setup_pci_device(dev, &it8213_chipsets[id->driver_data]);
 334         return 0;
 335 }
 336
 337
 338 static struct pci_device_id it8213_pci_tbl[] = {
 339         { PCI_VENDOR_ID_ITE, 0x8213, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
 340         { 0, },
 341 };
 342
 343 MODULE_DEVICE_TABLE(pci, it8213_pci_tbl);
 344
 345 static struct pci_driver driver = {
 346         .name           = "ITE8213_IDE",
 347         .id_table       = it8213_pci_tbl,
 348         .probe          = it8213_init_one,
 349 };
 350
 351 static int __init it8213_ide_init(void)
 352 {
 353         return ide_pci_register_driver(&driver);
 354 }
 355
 356 module_init(it8213_ide_init);
 357
 358 MODULE_AUTHOR("Jack Lee, Alan Cox");
 359 MODULE_DESCRIPTION("PCI driver module for the ITE 8213");
 360 MODULE_LICENSE("GPL");