jmicron.c

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/*
 * Copyright (C) 2006       Red Hat
 *
 *  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/ide.h>
#include <linux/init.h>

#define DRV_NAME "jmicron"

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

static u8 jmicron_cable_detect(ide_hwif_t *hwif)
{
    struct pci_dev *pdev = to_pci_dev(hwif->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_hwif_t *hwif, ide_drive_t *drive)
{
}

static void jmicron_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive)
{
}

static const struct ide_port_ops jmicron_port_ops = {
    .set_pio_mode       = jmicron_set_pio_mode,
    .set_dma_mode       = jmicron_set_dma_mode,
    .cable_detect       = jmicron_cable_detect,
};

static const struct ide_port_info jmicron_chipset __devinitconst = {
    .name       = DRV_NAME,
    .enablebits = { { 0x40, 0x01, 0x01 }, { 0x40, 0x10, 0x10 } },
    .port_ops   = &jmicron_port_ops,
    .pio_mask   = ATA_PIO5,
    .mwdma_mask = ATA_MWDMA2,
    .udma_mask  = ATA_UDMA6,
};

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

/* 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 jmicron_pci_driver = {
    .name       = "JMicron IDE",
    .id_table   = jmicron_pci_tbl,
    .probe      = jmicron_init_one,
    .remove     = ide_pci_remove,
    .suspend    = ide_pci_suspend,
    .resume     = ide_pci_resume,
};

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

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

module_init(jmicron_ide_init);
module_exit(jmicron_ide_exit);

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