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Linux/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_SLEEP
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);
187 

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