LXR linux/drivers/ata/pata

   1/*
   2 *      Marvell PATA driver.
   3 *
   4 *      For the moment we drive the PATA port in legacy mode. That
   5 *      isn't making full use of the device functionality but it is
   6 *      easy to get working.
   7 *
   8 *      (c) 2006 Red Hat
   9 */
  10
  11#include <linux/kernel.h>
  12#include <linux/module.h>
  13#include <linux/pci.h>
  14#include <linux/blkdev.h>
  15#include <linux/delay.h>
  16#include <linux/device.h>
  17#include <scsi/scsi_host.h>
  18#include <linux/libata.h>
  19#include <linux/ata.h>
  20
  21#define DRV_NAME        "pata_marvell"
  22#define DRV_VERSION     "0.1.6"
  23
  24/**
  25 *      marvell_pata_active     -       check if PATA is active
  26 *      @pdev: PCI device
  27 *
  28 *      Returns 1 if the PATA port may be active. We know how to check this
  29 *      for the 6145 but not the other devices
  30 */
  31
  32static int marvell_pata_active(struct pci_dev *pdev)
  33{
  34        int i;
  35        u32 devices;
  36        void __iomem *barp;
  37
  38        /* We don't yet know how to do this for other devices */
  39        if (pdev->device != 0x6145)
  40                return 1;
  41
  42        barp = pci_iomap(pdev, 5, 0x10);
  43        if (barp == NULL)
  44                return -ENOMEM;
  45
  46        printk("BAR5:");
  47        for(i = 0; i <= 0x0F; i++)
  48                printk("%02X:%02X ", i, ioread8(barp + i));
  49        printk("\n");
  50
  51        devices = ioread32(barp + 0x0C);
  52        pci_iounmap(pdev, barp);
  53
  54        if (devices & 0x10)
  55                return 1;
  56        return 0;
  57}
  58
  59/**
  60 *      marvell_pre_reset       -       probe begin
  61 *      @link: link
  62 *      @deadline: deadline jiffies for the operation
  63 *
  64 *      Perform the PATA port setup we need.
  65 */
  66
  67static int marvell_pre_reset(struct ata_link *link, unsigned long deadline)
  68{
  69        struct ata_port *ap = link->ap;
  70        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  71
  72        if (pdev->device == 0x6145 && ap->port_no == 0 &&
  73                !marvell_pata_active(pdev))     /* PATA enable ? */
  74                        return -ENOENT;
  75
  76        return ata_sff_prereset(link, deadline);
  77}
  78
  79static int marvell_cable_detect(struct ata_port *ap)
  80{
  81        /* Cable type */
  82        switch(ap->port_no)
  83        {
  84        case 0:
  85                if (ioread8(ap->ioaddr.bmdma_addr + 1) & 1)
  86                        return ATA_CBL_PATA40;
  87                return ATA_CBL_PATA80;
  88        case 1: /* Legacy SATA port */
  89                return ATA_CBL_SATA;
  90        }
  91
  92        BUG();
  93        return 0;       /* Our BUG macro needs the right markup */
  94}
  95
  96/* No PIO or DMA methods needed for this device */
  97
  98static struct scsi_host_template marvell_sht = {
  99        ATA_BMDMA_SHT(DRV_NAME),
 100};
 101
 102static struct ata_port_operations marvell_ops = {
 103        .inherits               = &ata_bmdma_port_ops,
 104        .cable_detect           = marvell_cable_detect,
 105        .prereset               = marvell_pre_reset,
 106};
 107
 108
 109/**
 110 *      marvell_init_one - Register Marvell ATA PCI device with kernel services
 111 *      @pdev: PCI device to register
 112 *      @ent: Entry in marvell_pci_tbl matching with @pdev
 113 *
 114 *      Called from kernel PCI layer.
 115 *
 116 *      LOCKING:
 117 *      Inherited from PCI layer (may sleep).
 118 *
 119 *      RETURNS:
 120 *      Zero on success, or -ERRNO value.
 121 */
 122
 123static int marvell_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
 124{
 125        static const struct ata_port_info info = {
 126                .flags          = ATA_FLAG_SLAVE_POSS,
 127
 128                .pio_mask       = ATA_PIO4,
 129                .mwdma_mask     = ATA_MWDMA2,
 130                .udma_mask      = ATA_UDMA5,
 131
 132                .port_ops       = &marvell_ops,
 133        };
 134        static const struct ata_port_info info_sata = {
 135                /* Slave possible as its magically mapped not real */
 136                .flags          = ATA_FLAG_SLAVE_POSS,
 137
 138                .pio_mask       = ATA_PIO4,
 139                .mwdma_mask     = ATA_MWDMA2,
 140                .udma_mask      = ATA_UDMA6,
 141
 142                .port_ops       = &marvell_ops,
 143        };
 144        const struct ata_port_info *ppi[] = { &info, &info_sata };
 145
 146        if (pdev->device == 0x6101)
 147                ppi[1] = &ata_dummy_port_info;
 148
 149#if defined(CONFIG_SATA_AHCI) || defined(CONFIG_SATA_AHCI_MODULE)
 150        if (!marvell_pata_active(pdev)) {
 151                printk(KERN_INFO DRV_NAME ": PATA port not active, deferring to AHCI driver.\n");
 152                return -ENODEV;
 153        }
 154#endif
 155        return ata_pci_bmdma_init_one(pdev, ppi, &marvell_sht, NULL, 0);
 156}
 157
 158static const struct pci_device_id marvell_pci_tbl[] = {
 159        { PCI_DEVICE(0x11AB, 0x6101), },
 160        { PCI_DEVICE(0x11AB, 0x6121), },
 161        { PCI_DEVICE(0x11AB, 0x6123), },
 162        { PCI_DEVICE(0x11AB, 0x6145), },
 163        { PCI_DEVICE(0x1B4B, 0x91A0), },
 164        { PCI_DEVICE(0x1B4B, 0x91A4), },
 165
 166        { }     /* terminate list */
 167};
 168
 169static struct pci_driver marvell_pci_driver = {
 170        .name                   = DRV_NAME,
 171        .id_table               = marvell_pci_tbl,
 172        .probe                  = marvell_init_one,
 173        .remove                 = ata_pci_remove_one,
 174#ifdef CONFIG_PM_SLEEP
 175        .suspend                = ata_pci_device_suspend,
 176        .resume                 = ata_pci_device_resume,
 177#endif
 178};
 179
 180module_pci_driver(marvell_pci_driver);
 181
 182MODULE_AUTHOR("Alan Cox");
 183MODULE_DESCRIPTION("SCSI low-level driver for Marvell ATA in legacy mode");
 184MODULE_LICENSE("GPL");
 185MODULE_DEVICE_TABLE(pci, marvell_pci_tbl);
 186MODULE_VERSION(DRV_VERSION);
 187