Logo Search packages:      
Sourcecode: linux version File versions  Download package

it8213.c

/*
 * ITE 8213 IDE driver
 *
 * Copyright (C) 2006 Jack Lee
 * Copyright (C) 2006 Alan Cox
 * Copyright (C) 2007 Bartlomiej Zolnierkiewicz
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/hdreg.h>
#include <linux/ide.h>
#include <linux/init.h>

#include <asm/io.h>

/**
 *    it8213_set_pio_mode     -     set host controller for PIO mode
 *    @drive: drive
 *    @pio: PIO mode number
 *
 *    Set the interface PIO mode.
 */

static void it8213_set_pio_mode(ide_drive_t *drive, const u8 pio)
{
      ide_hwif_t *hwif  = HWIF(drive);
      struct pci_dev *dev     = hwif->pci_dev;
      int is_slave            = drive->dn & 1;
      int master_port         = 0x40;
      int slave_port          = 0x44;
      unsigned long flags;
      u16 master_data;
      u8 slave_data;
      static DEFINE_SPINLOCK(tune_lock);
      int control = 0;

      static const u8 timings[][2]= {
                              { 0, 0 },
                              { 0, 0 },
                              { 1, 0 },
                              { 2, 1 },
                              { 2, 3 }, };

      spin_lock_irqsave(&tune_lock, flags);
      pci_read_config_word(dev, master_port, &master_data);

      if (pio > 1)
            control |= 1;     /* Programmable timing on */
      if (drive->media != ide_disk)
            control |= 4;     /* ATAPI */
      if (pio > 2)
            control |= 2;     /* IORDY */
      if (is_slave) {
            master_data |=  0x4000;
            master_data &= ~0x0070;
            if (pio > 1)
                  master_data = master_data | (control << 4);
            pci_read_config_byte(dev, slave_port, &slave_data);
            slave_data = slave_data & 0xf0;
            slave_data = slave_data | (timings[pio][0] << 2) | timings[pio][1];
      } else {
            master_data &= ~0x3307;
            if (pio > 1)
                  master_data = master_data | control;
            master_data = master_data | (timings[pio][0] << 12) | (timings[pio][1] << 8);
      }
      pci_write_config_word(dev, master_port, master_data);
      if (is_slave)
            pci_write_config_byte(dev, slave_port, slave_data);
      spin_unlock_irqrestore(&tune_lock, flags);
}

/**
 *    it8213_set_dma_mode     -     set host controller for DMA mode
 *    @drive: drive
 *    @speed: DMA mode
 *
 *    Tune the ITE chipset for the DMA mode.
 */

static void it8213_set_dma_mode(ide_drive_t *drive, const u8 speed)
{
      ide_hwif_t *hwif  = HWIF(drive);
      struct pci_dev *dev     = hwif->pci_dev;
      u8 maslave        = 0x40;
      int a_speed       = 3 << (drive->dn * 4);
      int u_flag        = 1 << drive->dn;
      int v_flag        = 0x01 << drive->dn;
      int w_flag        = 0x10 << drive->dn;
      int u_speed       = 0;
      u16               reg4042, reg4a;
      u8                reg48, reg54, reg55;

      pci_read_config_word(dev, maslave, &reg4042);
      pci_read_config_byte(dev, 0x48, &reg48);
      pci_read_config_word(dev, 0x4a, &reg4a);
      pci_read_config_byte(dev, 0x54, &reg54);
      pci_read_config_byte(dev, 0x55, &reg55);

      switch(speed) {
            case XFER_UDMA_6:
            case XFER_UDMA_4:
            case XFER_UDMA_2: u_speed = 2 << (drive->dn * 4); break;
            case XFER_UDMA_5:
            case XFER_UDMA_3:
            case XFER_UDMA_1: u_speed = 1 << (drive->dn * 4); break;
            case XFER_UDMA_0: u_speed = 0 << (drive->dn * 4); break;
                  break;
            case XFER_MW_DMA_2:
            case XFER_MW_DMA_1:
            case XFER_SW_DMA_2:
                  break;
            default:
                  return;
      }

      if (speed >= XFER_UDMA_0) {
            if (!(reg48 & u_flag))
                  pci_write_config_byte(dev, 0x48, reg48 | u_flag);
            if (speed >= XFER_UDMA_5) {
                  pci_write_config_byte(dev, 0x55, (u8) reg55|w_flag);
            } else {
                  pci_write_config_byte(dev, 0x55, (u8) reg55 & ~w_flag);
            }

            if ((reg4a & a_speed) != u_speed)
                  pci_write_config_word(dev, 0x4a, (reg4a & ~a_speed) | u_speed);
            if (speed > XFER_UDMA_2) {
                  if (!(reg54 & v_flag))
                        pci_write_config_byte(dev, 0x54, reg54 | v_flag);
            } else
                  pci_write_config_byte(dev, 0x54, reg54 & ~v_flag);
      } else {
            const u8 mwdma_to_pio[] = { 0, 3, 4 };
            u8 pio;

            if (reg48 & u_flag)
                  pci_write_config_byte(dev, 0x48, reg48 & ~u_flag);
            if (reg4a & a_speed)
                  pci_write_config_word(dev, 0x4a, reg4a & ~a_speed);
            if (reg54 & v_flag)
                  pci_write_config_byte(dev, 0x54, reg54 & ~v_flag);
            if (reg55 & w_flag)
                  pci_write_config_byte(dev, 0x55, (u8) reg55 & ~w_flag);

            if (speed >= XFER_MW_DMA_0)
                  pio = mwdma_to_pio[speed - XFER_MW_DMA_0];
            else
                  pio = 2; /* only SWDMA2 is allowed */

            it8213_set_pio_mode(drive, pio);
      }
}

/**
 *    init_hwif_it8213  -     set up hwif structs
 *    @hwif: interface to set up
 *
 *    We do the basic set up of the interface structure.
 */

static void __devinit init_hwif_it8213(ide_hwif_t *hwif)
{
      u8 reg42h = 0;

      hwif->set_dma_mode = &it8213_set_dma_mode;
      hwif->set_pio_mode = &it8213_set_pio_mode;

      if (!hwif->dma_base)
            return;

      pci_read_config_byte(hwif->pci_dev, 0x42, &reg42h);

      if (hwif->cbl != ATA_CBL_PATA40_SHORT)
            hwif->cbl = (reg42h & 0x02) ? ATA_CBL_PATA40 : ATA_CBL_PATA80;
}


#define DECLARE_ITE_DEV(name_str)               \
      {                                   \
            .name       = name_str,       \
            .init_hwif  = init_hwif_it8213,     \
            .enablebits = {{0x41,0x80,0x80}}, \
            .host_flags = IDE_HFLAG_SINGLE |    \
                          IDE_HFLAG_BOOTABLE,   \
            .pio_mask   = ATA_PIO4,       \
            .swdma_mask = ATA_SWDMA2_ONLY,      \
            .mwdma_mask = ATA_MWDMA12_ONLY,     \
            .udma_mask  = ATA_UDMA6,            \
      }

static const struct ide_port_info it8213_chipsets[] __devinitdata = {
      /* 0 */ DECLARE_ITE_DEV("IT8213"),
};


/**
 *    it8213_init_one   -     pci layer discovery entry
 *    @dev: PCI device
 *    @id: ident table entry
 *
 *    Called by the PCI code when it finds an ITE8213 controller. As
 *    this device follows the standard interfaces we can use the
 *    standard helper functions to do almost all the work for us.
 */

static int __devinit it8213_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
      ide_setup_pci_device(dev, &it8213_chipsets[id->driver_data]);
      return 0;
}

static const struct pci_device_id it8213_pci_tbl[] = {
      { PCI_VDEVICE(ITE, PCI_DEVICE_ID_ITE_8213), 0 },
      { 0, },
};

MODULE_DEVICE_TABLE(pci, it8213_pci_tbl);

static struct pci_driver driver = {
      .name       = "ITE8213_IDE",
      .id_table   = it8213_pci_tbl,
      .probe            = it8213_init_one,
};

static int __init it8213_ide_init(void)
{
      return ide_pci_register_driver(&driver);
}

module_init(it8213_ide_init);

MODULE_AUTHOR("Jack Lee, Alan Cox");
MODULE_DESCRIPTION("PCI driver module for the ITE 8213");
MODULE_LICENSE("GPL");

Generated by  Doxygen 1.6.0   Back to index