drivers/ata/pata_marvell.c

   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
  32 static 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
  67 static 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
  79 static 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
  98 static struct scsi_host_template marvell_sht = {
  99         ATA_BMDMA_SHT(DRV_NAME),
 100 };
 101
 102 static 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
 123 static 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
 158 static 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
 169 static 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
 175         .suspend                = ata_pci_device_suspend,
 176         .resume                 = ata_pci_device_resume,
 177 #endif
 178 };
 179
 180 module_pci_driver(marvell_pci_driver);
 181
 182 MODULE_AUTHOR("Alan Cox");
 183 MODULE_DESCRIPTION("SCSI low-level driver for Marvell ATA in legacy mode");
 184 MODULE_LICENSE("GPL");
 185 MODULE_DEVICE_TABLE(pci, marvell_pci_tbl);
 186 MODULE_VERSION(DRV_VERSION);