root/drivers/ata/pata_marvell.c

DEFINITIONS

1. marvell_pata_active
2. marvell_pre_reset
3. marvell_cable_detect
4. marvell_init_one

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