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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/init.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 defined(CONFIG_SATA_AHCI) || defined(CONFIG_SATA_AHCI_MODULE)
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
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);
188 

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