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_set_pio_mode(ide_drive_t *drive, const u8 pio)
 109 {
 110         it8213_tune_pio(drive, pio);
 111         ide_config_drive_speed(drive, XFER_PIO_0 + pio);
 112 }
 113
 114 /**
 115  *      it8213_tune_chipset     -       set controller timings
 116  *      @drive: Drive to set up
 117  *      @speed: speed we want to achieve
 118  *
 119  *      Tune the ITE chipset for the desired mode.
 120  */
 121
 122 static int it8213_tune_chipset(ide_drive_t *drive, const u8 speed)
 123 {
 124         ide_hwif_t *hwif        = HWIF(drive);
 125         struct pci_dev *dev     = hwif->pci_dev;
 126         u8 maslave              = 0x40;
 127         int a_speed             = 3 << (drive->dn * 4);
 128         int u_flag              = 1 << drive->dn;
 129         int v_flag              = 0x01 << drive->dn;
 130         int w_flag              = 0x10 << drive->dn;
 131         int u_speed             = 0;
 132         u16                     reg4042, reg4a;
 133         u8                      reg48, reg54, reg55;
 134
 135         pci_read_config_word(dev, maslave, &reg4042);
 136         pci_read_config_byte(dev, 0x48, &reg48);
 137         pci_read_config_word(dev, 0x4a, &reg4a);
 138         pci_read_config_byte(dev, 0x54, &reg54);
 139         pci_read_config_byte(dev, 0x55, &reg55);
 140
 141         switch(speed) {
 142                 case XFER_UDMA_6:
 143                 case XFER_UDMA_4:
 144                 case XFER_UDMA_2:       u_speed = 2 << (drive->dn * 4); break;
 145                 case XFER_UDMA_5:
 146                 case XFER_UDMA_3:
 147                 case XFER_UDMA_1:       u_speed = 1 << (drive->dn * 4); break;
 148                 case XFER_UDMA_0:       u_speed = 0 << (drive->dn * 4); break;
 149                         break;
 150                 case XFER_MW_DMA_2:
 151                 case XFER_MW_DMA_1:
 152                 case XFER_SW_DMA_2:
 153                         break;
 154                 default:
 155                         return -1;
 156         }
 157
 158         if (speed >= XFER_UDMA_0) {
 159                 if (!(reg48 & u_flag))
 160                         pci_write_config_byte(dev, 0x48, reg48 | u_flag);
 161                 if (speed >= XFER_UDMA_5) {
 162                         pci_write_config_byte(dev, 0x55, (u8) reg55|w_flag);
 163                 } else {
 164                         pci_write_config_byte(dev, 0x55, (u8) reg55 & ~w_flag);
 165                 }
 166
 167                 if ((reg4a & a_speed) != u_speed)
 168                         pci_write_config_word(dev, 0x4a, (reg4a & ~a_speed) | u_speed);
 169                 if (speed > XFER_UDMA_2) {
 170                         if (!(reg54 & v_flag))
 171                                 pci_write_config_byte(dev, 0x54, reg54 | v_flag);
 172                 } else
 173                         pci_write_config_byte(dev, 0x54, reg54 & ~v_flag);
 174         } else {
 175                 if (reg48 & u_flag)
 176                         pci_write_config_byte(dev, 0x48, reg48 & ~u_flag);
 177                 if (reg4a & a_speed)
 178                         pci_write_config_word(dev, 0x4a, reg4a & ~a_speed);
 179                 if (reg54 & v_flag)
 180                         pci_write_config_byte(dev, 0x54, reg54 & ~v_flag);
 181                 if (reg55 & w_flag)
 182                         pci_write_config_byte(dev, 0x55, (u8) reg55 & ~w_flag);
 183         }
 184
 185         it8213_tune_pio(drive, it8213_dma_2_pio(speed));
 186
 187         return ide_config_drive_speed(drive, speed);
 188 }
 189
 190 /**
 191  *      it8213_configure_drive_for_dma  -       set up for DMA transfers
 192  *      @drive: drive we are going to set up
 193  *
 194  *      Set up the drive for DMA, tune the controller and drive as
 195  *      required. If the drive isn't suitable for DMA or we hit
 196  *      other problems then we will drop down to PIO and set up
 197  *      PIO appropriately
 198  */
 199
 200 static int it8213_config_drive_for_dma (ide_drive_t *drive)
 201 {
 202         if (ide_tune_dma(drive))
 203                 return 0;
 204
 205         ide_set_max_pio(drive);
 206
 207         return -1;
 208 }
 209
 210 /**
 211  *      init_hwif_it8213        -       set up hwif structs
 212  *      @hwif: interface to set up
 213  *
 214  *      We do the basic set up of the interface structure. The IT8212
 215  *      requires several custom handlers so we override the default
 216  *      ide DMA handlers appropriately
 217  */
 218
 219 static void __devinit init_hwif_it8213(ide_hwif_t *hwif)
 220 {
 221         u8 reg42h = 0;
 222
 223         hwif->speedproc = &it8213_tune_chipset;
 224         hwif->set_pio_mode = &it8213_set_pio_mode;
 225
 226         hwif->autodma = 0;
 227
 228         hwif->drives[0].autotune = 1;
 229         hwif->drives[1].autotune = 1;
 230
 231         if (!hwif->dma_base)
 232                 return;
 233
 234         hwif->atapi_dma = 1;
 235         hwif->ultra_mask = 0x7f;
 236         hwif->mwdma_mask = 0x06;
 237         hwif->swdma_mask = 0x04;
 238
 239         pci_read_config_byte(hwif->pci_dev, 0x42, &reg42h);
 240
 241         hwif->ide_dma_check = &it8213_config_drive_for_dma;
 242
 243         if (hwif->cbl != ATA_CBL_PATA40_SHORT)
 244                 hwif->cbl = (reg42h & 0x02) ? ATA_CBL_PATA40 : ATA_CBL_PATA80;
 245
 246         /*
 247          *      The BIOS often doesn't set up DMA on this controller
 248          *      so we always do it.
 249          */
 250         if (!noautodma)
 251                 hwif->autodma = 1;
 252
 253         hwif->drives[0].autodma = hwif->autodma;
 254         hwif->drives[1].autodma = hwif->autodma;
 255 }
 256
 257
 258 #define DECLARE_ITE_DEV(name_str)                       \
 259         {                                               \
 260                 .name           = name_str,             \
 261                 .init_hwif      = init_hwif_it8213,     \
 262                 .autodma        = AUTODMA,              \
 263                 .enablebits     = {{0x41,0x80,0x80}}, \
 264                 .bootable       = ON_BOARD,             \
 265                 .host_flags     = IDE_HFLAG_SINGLE,     \
 266                 .pio_mask       = ATA_PIO4,             \
 267         }
 268
 269 static ide_pci_device_t it8213_chipsets[] __devinitdata = {
 270         /* 0 */ DECLARE_ITE_DEV("IT8213"),
 271 };
 272
 273
 274 /**
 275  *      it8213_init_one -       pci layer discovery entry
 276  *      @dev: PCI device
 277  *      @id: ident table entry
 278  *
 279  *      Called by the PCI code when it finds an ITE8213 controller. As
 280  *      this device follows the standard interfaces we can use the
 281  *      standard helper functions to do almost all the work for us.
 282  */
 283
 284 static int __devinit it8213_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 285 {
 286         ide_setup_pci_device(dev, &it8213_chipsets[id->driver_data]);
 287         return 0;
 288 }
 289
 290
 291 static struct pci_device_id it8213_pci_tbl[] = {
 292         { PCI_VENDOR_ID_ITE, 0x8213, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
 293         { 0, },
 294 };
 295
 296 MODULE_DEVICE_TABLE(pci, it8213_pci_tbl);
 297
 298 static struct pci_driver driver = {
 299         .name           = "ITE8213_IDE",
 300         .id_table       = it8213_pci_tbl,
 301         .probe          = it8213_init_one,
 302 };
 303
 304 static int __init it8213_ide_init(void)
 305 {
 306         return ide_pci_register_driver(&driver);
 307 }
 308
 309 module_init(it8213_ide_init);
 310
 311 MODULE_AUTHOR("Jack Lee, Alan Cox");
 312 MODULE_DESCRIPTION("PCI driver module for the ITE 8213");
 313 MODULE_LICENSE("GPL");