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jmicron.c

/*
 * Copyright (C) 2006         Red Hat <alan@redhat.com>
 *
 *  May be copied or modified under the terms of the GNU General Public License
 */

#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>

typedef enum {
      PORT_PATA0 = 0,
      PORT_PATA1 = 1,
      PORT_SATA = 2,
} port_type;

/**
 *    ata66_jmicron           -     Cable check
 *    @hwif: IDE port
 *
 *    Returns the cable type.
 */

static u8 __devinit ata66_jmicron(ide_hwif_t *hwif)
{
      struct pci_dev *pdev = hwif->pci_dev;

      u32 control;
      u32 control5;

      int port = hwif->channel;
      port_type port_map[2];

      pci_read_config_dword(pdev, 0x40, &control);

      /* There are two basic mappings. One has the two SATA ports merged
         as master/slave and the secondary as PATA, the other has only the
         SATA port mapped */
      if (control & (1 << 23)) {
            port_map[0] = PORT_SATA;
            port_map[1] = PORT_PATA0;
      } else {
            port_map[0] = PORT_SATA;
            port_map[1] = PORT_SATA;
      }

      /* The 365/366 may have this bit set to map the second PATA port
         as the internal primary channel */
      pci_read_config_dword(pdev, 0x80, &control5);
      if (control5 & (1<<24))
            port_map[0] = PORT_PATA1;

      /* The two ports may then be logically swapped by the firmware */
      if (control & (1 << 22))
            port = port ^ 1;

      /*
       *    Now we know which physical port we are talking about we can
       *    actually do our cable checking etc. Thankfully we don't need
       *    to do the plumbing for other cases.
       */
      switch (port_map[port])
      {
      case PORT_PATA0:
            if (control & (1 << 3)) /* 40/80 pin primary */
                  return ATA_CBL_PATA40;
            return ATA_CBL_PATA80;
      case PORT_PATA1:
            if (control5 & (1 << 19))     /* 40/80 pin secondary */
                  return ATA_CBL_PATA40;
            return ATA_CBL_PATA80;
      case PORT_SATA:
            break;
      }
      /* Avoid bogus "control reaches end of non-void function" */
      return ATA_CBL_PATA80;
}

static void jmicron_set_pio_mode(ide_drive_t *drive, const u8 pio)
{
}

/**
 *    jmicron_set_dma_mode    -     set host controller for DMA mode
 *    @drive: drive
 *    @mode: DMA mode
 *
 *    As the JMicron snoops for timings we don't need to do anything here.
 */

static void jmicron_set_dma_mode(ide_drive_t *drive, const u8 mode)
{
}

/**
 *    init_hwif_jmicron -     set up hwif structs
 *    @hwif: interface to set up
 *
 *    Minimal set up is required for the Jmicron hardware.
 */

static void __devinit init_hwif_jmicron(ide_hwif_t *hwif)
{
      hwif->set_pio_mode = &jmicron_set_pio_mode;
      hwif->set_dma_mode = &jmicron_set_dma_mode;

      if (hwif->dma_base == 0)
            return;

      if (hwif->cbl != ATA_CBL_PATA40_SHORT)
            hwif->cbl = ata66_jmicron(hwif);
}

static const struct ide_port_info jmicron_chipset __devinitdata = {
      .name       = "JMB",
      .init_hwif  = init_hwif_jmicron,
      .host_flags = IDE_HFLAG_BOOTABLE,
      .enablebits = { { 0x40, 0x01, 0x01 }, { 0x40, 0x10, 0x10 } },
      .pio_mask   = ATA_PIO5,
      .mwdma_mask = ATA_MWDMA2,
      .udma_mask  = ATA_UDMA6,
};

/**
 *    jmicron_init_one  -     pci layer discovery entry
 *    @dev: PCI device
 *    @id: ident table entry
 *
 *    Called by the PCI code when it finds a Jmicron controller.
 *    We then use the IDE PCI generic helper to do most of the work.
 */

static int __devinit jmicron_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
      return ide_setup_pci_device(dev, &jmicron_chipset);
}

/* All JMB PATA controllers have and will continue to have the same
 * interface.  Matching vendor and device class is enough for all
 * current and future controllers if the controller is programmed
 * properly.
 *
 * If libata is configured, jmicron PCI quirk programs the controller
 * into the correct mode.  If libata isn't configured, match known
 * device IDs too to maintain backward compatibility.
 */
static struct pci_device_id jmicron_pci_tbl[] = {
#if !defined(CONFIG_ATA) && !defined(CONFIG_ATA_MODULE)
      { PCI_VDEVICE(JMICRON, PCI_DEVICE_ID_JMICRON_JMB361) },
      { PCI_VDEVICE(JMICRON, PCI_DEVICE_ID_JMICRON_JMB363) },
      { PCI_VDEVICE(JMICRON, PCI_DEVICE_ID_JMICRON_JMB365) },
      { PCI_VDEVICE(JMICRON, PCI_DEVICE_ID_JMICRON_JMB366) },
      { PCI_VDEVICE(JMICRON, PCI_DEVICE_ID_JMICRON_JMB368) },
#endif
      { PCI_VENDOR_ID_JMICRON, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
        PCI_CLASS_STORAGE_IDE << 8, 0xffff00, 0 },
      { 0, },
};

MODULE_DEVICE_TABLE(pci, jmicron_pci_tbl);

static struct pci_driver driver = {
      .name       = "JMicron IDE",
      .id_table   = jmicron_pci_tbl,
      .probe            = jmicron_init_one,
};

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

module_init(jmicron_ide_init);

MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("PCI driver module for the JMicron in legacy modes");
MODULE_LICENSE("GPL");

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