linux-imx

/*

 *    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/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 */