drivers/ata/pata_marvell.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *      Marvell PATA driver.
   4  *
   5  *      For the moment we drive the PATA port in legacy mode. That
   6  *      isn't making full use of the device functionality but it is
   7  *      easy to get working.
   8  *
   9  *      (c) 2006 Red Hat
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/pci.h>
  15 #include <linux/blkdev.h>
  16 #include <linux/delay.h>
  17 #include <linux/device.h>
  18 #include <scsi/scsi_host.h>
  19 #include <linux/libata.h>
  20 #include <linux/ata.h>
  21
  22 #define DRV_NAME        "pata_marvell"
  23 #define DRV_VERSION     "0.1.6"
  24
  25 /**
  26  *      marvell_pata_active     -       check if PATA is active
  27  *      @pdev: PCI device
  28  *
  29  *      Returns 1 if the PATA port may be active. We know how to check this
  30  *      for the 6145 but not the other devices
  31  */
  32
  33 static int marvell_pata_active(struct pci_dev *pdev)
  34 {
  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         devices = ioread32(barp + 0x0C);
  47         pci_iounmap(pdev, barp);
  48
  49         if (devices & 0x10)
  50                 return 1;
  51         return 0;
  52 }
  53
  54 /**
  55  *      marvell_pre_reset       -       probe begin
  56  *      @link: link
  57  *      @deadline: deadline jiffies for the operation
  58  *
  59  *      Perform the PATA port setup we need.
  60  */
  61
  62 static int marvell_pre_reset(struct ata_link *link, unsigned long deadline)
  63 {
  64         struct ata_port *ap = link->ap;
  65         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  66
  67         if (pdev->device == 0x6145 && ap->port_no == 0 &&
  68                 !marvell_pata_active(pdev))     /* PATA enable ? */
  69                         return -ENOENT;
  70
  71         return ata_sff_prereset(link, deadline);
  72 }
  73
  74 static int marvell_cable_detect(struct ata_port *ap)
  75 {
  76         /* Cable type */
  77         switch(ap->port_no)
  78         {
  79         case 0:
  80                 if (!ap->ioaddr.bmdma_addr)
  81                         return ATA_CBL_PATA_UNK;
  82                 if (ioread8(ap->ioaddr.bmdma_addr + 1) & 1)
  83                         return ATA_CBL_PATA40;
  84                 return ATA_CBL_PATA80;
  85         case 1: /* Legacy SATA port */
  86                 return ATA_CBL_SATA;
  87         }
  88
  89         BUG();
  90         return 0;       /* Our BUG macro needs the right markup */
  91 }
  92
  93 /* No PIO or DMA methods needed for this device */
  94
  95 static const struct scsi_host_template marvell_sht = {
  96         ATA_BMDMA_SHT(DRV_NAME),
  97 };
  98
  99 static struct ata_port_operations marvell_ops = {
 100         .inherits               = &ata_bmdma_port_ops,
 101         .cable_detect           = marvell_cable_detect,
 102         .prereset               = marvell_pre_reset,
 103 };
 104
 105
 106 /**
 107  *      marvell_init_one - Register Marvell ATA PCI device with kernel services
 108  *      @pdev: PCI device to register
 109  *      @id: PCI device ID
 110  *
 111  *      Called from kernel PCI layer.
 112  *
 113  *      LOCKING:
 114  *      Inherited from PCI layer (may sleep).
 115  *
 116  *      RETURNS:
 117  *      Zero on success, or -ERRNO value.
 118  */
 119
 120 static int marvell_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
 121 {
 122         static const struct ata_port_info info = {
 123                 .flags          = ATA_FLAG_SLAVE_POSS,
 124
 125                 .pio_mask       = ATA_PIO4,
 126                 .mwdma_mask     = ATA_MWDMA2,
 127                 .udma_mask      = ATA_UDMA5,
 128
 129                 .port_ops       = &marvell_ops,
 130         };
 131         static const struct ata_port_info info_sata = {
 132                 /* Slave possible as its magically mapped not real */
 133                 .flags          = ATA_FLAG_SLAVE_POSS,
 134
 135                 .pio_mask       = ATA_PIO4,
 136                 .mwdma_mask     = ATA_MWDMA2,
 137                 .udma_mask      = ATA_UDMA6,
 138
 139                 .port_ops       = &marvell_ops,
 140         };
 141         const struct ata_port_info *ppi[] = { &info, &info_sata };
 142
 143         if (pdev->device == 0x6101)
 144                 ppi[1] = &ata_dummy_port_info;
 145
 146 #if IS_ENABLED(CONFIG_SATA_AHCI)
 147         if (!marvell_pata_active(pdev)) {
 148                 dev_info(&pdev->dev,
 149                          "PATA port not active, deferring to AHCI driver.\n");
 150                 return -ENODEV;
 151         }
 152 #endif
 153         return ata_pci_bmdma_init_one(pdev, ppi, &marvell_sht, NULL, 0);
 154 }
 155
 156 static const struct pci_device_id marvell_pci_tbl[] = {
 157         { PCI_DEVICE(0x11AB, 0x6101), },
 158         { PCI_DEVICE(0x11AB, 0x6121), },
 159         { PCI_DEVICE(0x11AB, 0x6123), },
 160         { PCI_DEVICE(0x11AB, 0x6145), },
 161         { PCI_DEVICE(0x1B4B, 0x91A0), },
 162         { PCI_DEVICE(0x1B4B, 0x91A4), },
 163
 164         { }     /* terminate list */
 165 };
 166
 167 static struct pci_driver marvell_pci_driver = {
 168         .name                   = DRV_NAME,
 169         .id_table               = marvell_pci_tbl,
 170         .probe                  = marvell_init_one,
 171         .remove                 = ata_pci_remove_one,
 172 #ifdef CONFIG_PM_SLEEP
 173         .suspend                = ata_pci_device_suspend,
 174         .resume                 = ata_pci_device_resume,
 175 #endif
 176 };
 177
 178 module_pci_driver(marvell_pci_driver);
 179
 180 MODULE_AUTHOR("Alan Cox");
 181 MODULE_DESCRIPTION("SCSI low-level driver for Marvell ATA in legacy mode");
 182 MODULE_LICENSE("GPL");
 183 MODULE_DEVICE_TABLE(pci, marvell_pci_tbl);
 184 MODULE_VERSION(DRV_VERSION);