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