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pata_jmicron.c

/*
 *    pata_jmicron.c - JMicron ATA driver for non AHCI mode. This drives the
 *                PATA port of the controller. The SATA ports are
 *                driven by AHCI in the usual configuration although
 *                this driver can handle other setups if we need it.
 *
 *    (c) 2006 Red Hat  <alan@redhat.com>
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>
#include <linux/ata.h>

#define DRV_NAME  "pata_jmicron"
#define DRV_VERSION     "0.1.5"

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

/**
 *    jmicron_pre_reset -     check for 40/80 pin
 *    @link: ATA link
 *    @deadline: deadline jiffies for the operation
 *
 *    Perform the PATA port setup we need.
 *
 *    On the Jmicron 361/363 there is a single PATA port that can be mapped
 *    either as primary or secondary (or neither). We don't do any policy
 *    and setup here. We assume that has been done by init_one and the
 *    BIOS.
 */
static int jmicron_pre_reset(struct ata_link *link, unsigned long deadline)
{
      struct ata_port *ap = link->ap;
      struct pci_dev *pdev = to_pci_dev(ap->host->dev);
      u32 control;
      u32 control5;
      int port_mask = 1<< (4 * ap->port_no);
      int port = ap->port_no;
      port_type port_map[2];

      /* Check if our port is enabled */
      pci_read_config_dword(pdev, 0x40, &control);
      if ((control & port_mask) == 0)
            return -ENOENT;

      /* 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 << 5)) == 0)
                  return -ENOENT;
            if (control & (1 << 3)) /* 40/80 pin primary */
                  ap->cbl = ATA_CBL_PATA40;
            else
                  ap->cbl = ATA_CBL_PATA80;
            break;
      case PORT_PATA1:
            /* Bit 21 is set if the port is enabled */
            if ((control5 & (1 << 21)) == 0)
                  return -ENOENT;
            if (control5 & (1 << 19))     /* 40/80 pin secondary */
                  ap->cbl = ATA_CBL_PATA40;
            else
                  ap->cbl = ATA_CBL_PATA80;
            break;
      case PORT_SATA:
            ap->cbl = ATA_CBL_SATA;
            break;
      }
      return ata_std_prereset(link, deadline);
}

/**
 *    jmicron_error_handler - Setup and error handler
 *    @ap: Port to handle
 *
 *    LOCKING:
 *    None (inherited from caller).
 */

static void jmicron_error_handler(struct ata_port *ap)
{
      return ata_bmdma_drive_eh(ap, jmicron_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
}

/* No PIO or DMA methods needed for this device */

static struct scsi_host_template jmicron_sht = {
      .module                 = THIS_MODULE,
      .name             = DRV_NAME,
      .ioctl                  = ata_scsi_ioctl,
      .queuecommand           = ata_scsi_queuecmd,
      .can_queue        = ATA_DEF_QUEUE,
      .this_id          = ATA_SHT_THIS_ID,
      .sg_tablesize           = LIBATA_MAX_PRD,
      .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
      .emulated         = ATA_SHT_EMULATED,
      .use_clustering         = ATA_SHT_USE_CLUSTERING,
      .proc_name        = DRV_NAME,
      .dma_boundary           = ATA_DMA_BOUNDARY,
      .slave_configure  = ata_scsi_slave_config,
      .slave_destroy          = ata_scsi_slave_destroy,
      /* Use standard CHS mapping rules */
      .bios_param       = ata_std_bios_param,
};

static const struct ata_port_operations jmicron_ops = {
      /* Task file is PCI ATA format, use helpers */
      .tf_load          = ata_tf_load,
      .tf_read          = ata_tf_read,
      .check_status           = ata_check_status,
      .exec_command           = ata_exec_command,
      .dev_select       = ata_std_dev_select,

      .freeze                 = ata_bmdma_freeze,
      .thaw             = ata_bmdma_thaw,
      .error_handler          = jmicron_error_handler,
      .post_internal_cmd      = ata_bmdma_post_internal_cmd,

      /* BMDMA handling is PCI ATA format, use helpers */
      .bmdma_setup            = ata_bmdma_setup,
      .bmdma_start            = ata_bmdma_start,
      .bmdma_stop       = ata_bmdma_stop,
      .bmdma_status           = ata_bmdma_status,
      .qc_prep          = ata_qc_prep,
      .qc_issue         = ata_qc_issue_prot,
      .data_xfer        = ata_data_xfer,

      /* IRQ-related hooks */
      .irq_handler            = ata_interrupt,
      .irq_clear        = ata_bmdma_irq_clear,
      .irq_on                 = ata_irq_on,

      /* Generic PATA PCI ATA helpers */
      .port_start       = ata_port_start,
};


/**
 *    jmicron_init_one - Register Jmicron ATA PCI device with kernel services
 *    @pdev: PCI device to register
 *    @ent: Entry in jmicron_pci_tbl matching with @pdev
 *
 *    Called from kernel PCI layer.
 *
 *    LOCKING:
 *    Inherited from PCI layer (may sleep).
 *
 *    RETURNS:
 *    Zero on success, or -ERRNO value.
 */

static int jmicron_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
{
      static const struct ata_port_info info = {
            .sht        = &jmicron_sht,
            .flags      = ATA_FLAG_SLAVE_POSS,

            .pio_mask   = 0x1f,
            .mwdma_mask = 0x07,
            .udma_mask  = ATA_UDMA5,

            .port_ops   = &jmicron_ops,
      };
      const struct ata_port_info *ppi[] = { &info, NULL };

      return ata_pci_init_one(pdev, ppi);
}

static const struct pci_device_id jmicron_pci_tbl[] = {
      { PCI_VENDOR_ID_JMICRON, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
        PCI_CLASS_STORAGE_IDE << 8, 0xffff00, 0 },
      { }   /* terminate list */
};

static struct pci_driver jmicron_pci_driver = {
      .name             = DRV_NAME,
      .id_table         = jmicron_pci_tbl,
      .probe                  = jmicron_init_one,
      .remove                 = ata_pci_remove_one,
#ifdef CONFIG_PM
      .suspend          = ata_pci_device_suspend,
      .resume                 = ata_pci_device_resume,
#endif
};

static int __init jmicron_init(void)
{
      return pci_register_driver(&jmicron_pci_driver);
}

static void __exit jmicron_exit(void)
{
      pci_unregister_driver(&jmicron_pci_driver);
}

module_init(jmicron_init);
module_exit(jmicron_exit);

MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("SCSI low-level driver for Jmicron PATA ports");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, jmicron_pci_tbl);
MODULE_VERSION(DRV_VERSION);


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