pata_jmicron.c

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/*
 *    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
 */

#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;

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_sff_prereset(link, deadline);
}

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

static struct scsi_host_template jmicron_sht = {
    ATA_BMDMA_SHT(DRV_NAME),
};

static struct ata_port_operations jmicron_ops = {
    .inherits       = &ata_bmdma_port_ops,
    .prereset       = jmicron_pre_reset,
};


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

        .pio_mask   = ATA_PIO4,
        .mwdma_mask = ATA_MWDMA2,
        .udma_mask  = ATA_UDMA5,

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

    return ata_pci_bmdma_init_one(pdev, ppi, &jmicron_sht, NULL, 0);
}

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
};

module_pci_driver(jmicron_pci_driver);

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);