drivers/ata/pata_jmicron.c

   1 /*
   2  *    pata_jmicron.c - JMicron ATA driver for non AHCI mode. This drives the
   3  *                      PATA port of the controller. The SATA ports are
   4  *                      driven by AHCI in the usual configuration although
   5  *                      this driver can handle other setups if we need it.
   6  *
   7  *      (c) 2006 Red Hat
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/pci.h>
  13 #include <linux/blkdev.h>
  14 #include <linux/delay.h>
  15 #include <linux/device.h>
  16 #include <scsi/scsi_host.h>
  17 #include <linux/libata.h>
  18 #include <linux/ata.h>
  19
  20 #define DRV_NAME        "pata_jmicron"
  21 #define DRV_VERSION     "0.1.5"
  22
  23 typedef enum {
  24         PORT_PATA0 = 0,
  25         PORT_PATA1 = 1,
  26         PORT_SATA = 2,
  27 } port_type;
  28
  29 /**
  30  *      jmicron_pre_reset       -       check for 40/80 pin
  31  *      @link: ATA link
  32  *      @deadline: deadline jiffies for the operation
  33  *
  34  *      Perform the PATA port setup we need.
  35  *
  36  *      On the Jmicron 361/363 there is a single PATA port that can be mapped
  37  *      either as primary or secondary (or neither). We don't do any policy
  38  *      and setup here. We assume that has been done by init_one and the
  39  *      BIOS.
  40  */
  41 static int jmicron_pre_reset(struct ata_link *link, unsigned long deadline)
  42 {
  43         struct ata_port *ap = link->ap;
  44         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  45         u32 control;
  46         u32 control5;
  47         int port_mask = 1<< (4 * ap->port_no);
  48         int port = ap->port_no;
  49         port_type port_map[2];
  50
  51         /* Check if our port is enabled */
  52         pci_read_config_dword(pdev, 0x40, &control);
  53         if ((control & port_mask) == 0)
  54                 return -ENOENT;
  55
  56         /* There are two basic mappings. One has the two SATA ports merged
  57            as master/slave and the secondary as PATA, the other has only the
  58            SATA port mapped */
  59         if (control & (1 << 23)) {
  60                 port_map[0] = PORT_SATA;
  61                 port_map[1] = PORT_PATA0;
  62         } else {
  63                 port_map[0] = PORT_SATA;
  64                 port_map[1] = PORT_SATA;
  65         }
  66
  67         /* The 365/366 may have this bit set to map the second PATA port
  68            as the internal primary channel */
  69         pci_read_config_dword(pdev, 0x80, &control5);
  70         if (control5 & (1<<24))
  71                 port_map[0] = PORT_PATA1;
  72
  73         /* The two ports may then be logically swapped by the firmware */
  74         if (control & (1 << 22))
  75                 port = port ^ 1;
  76
  77         /*
  78          *      Now we know which physical port we are talking about we can
  79          *      actually do our cable checking etc. Thankfully we don't need
  80          *      to do the plumbing for other cases.
  81          */
  82         switch (port_map[port]) {
  83         case PORT_PATA0:
  84                 if ((control & (1 << 5)) == 0)
  85                         return -ENOENT;
  86                 if (control & (1 << 3)) /* 40/80 pin primary */
  87                         ap->cbl = ATA_CBL_PATA40;
  88                 else
  89                         ap->cbl = ATA_CBL_PATA80;
  90                 break;
  91         case PORT_PATA1:
  92                 /* Bit 21 is set if the port is enabled */
  93                 if ((control5 & (1 << 21)) == 0)
  94                         return -ENOENT;
  95                 if (control5 & (1 << 19))       /* 40/80 pin secondary */
  96                         ap->cbl = ATA_CBL_PATA40;
  97                 else
  98                         ap->cbl = ATA_CBL_PATA80;
  99                 break;
 100         case PORT_SATA:
 101                 ap->cbl = ATA_CBL_SATA;
 102                 break;
 103         }
 104         return ata_sff_prereset(link, deadline);
 105 }
 106
 107 /* No PIO or DMA methods needed for this device */
 108
 109 static struct scsi_host_template jmicron_sht = {
 110         ATA_BMDMA_SHT(DRV_NAME),
 111 };
 112
 113 static struct ata_port_operations jmicron_ops = {
 114         .inherits               = &ata_bmdma_port_ops,
 115         .prereset               = jmicron_pre_reset,
 116 };
 117
 118
 119 /**
 120  *      jmicron_init_one - Register Jmicron ATA PCI device with kernel services
 121  *      @pdev: PCI device to register
 122  *      @ent: Entry in jmicron_pci_tbl matching with @pdev
 123  *
 124  *      Called from kernel PCI layer.
 125  *
 126  *      LOCKING:
 127  *      Inherited from PCI layer (may sleep).
 128  *
 129  *      RETURNS:
 130  *      Zero on success, or -ERRNO value.
 131  */
 132
 133 static int jmicron_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
 134 {
 135         static const struct ata_port_info info = {
 136                 .flags  = ATA_FLAG_SLAVE_POSS,
 137
 138                 .pio_mask       = ATA_PIO4,
 139                 .mwdma_mask     = ATA_MWDMA2,
 140                 .udma_mask      = ATA_UDMA5,
 141
 142                 .port_ops       = &jmicron_ops,
 143         };
 144         const struct ata_port_info *ppi[] = { &info, NULL };
 145
 146         return ata_pci_bmdma_init_one(pdev, ppi, &jmicron_sht, NULL, 0);
 147 }
 148
 149 static const struct pci_device_id jmicron_pci_tbl[] = {
 150         { PCI_VENDOR_ID_JMICRON, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
 151           PCI_CLASS_STORAGE_IDE << 8, 0xffff00, 0 },
 152         { }     /* terminate list */
 153 };
 154
 155 static struct pci_driver jmicron_pci_driver = {
 156         .name                   = DRV_NAME,
 157         .id_table               = jmicron_pci_tbl,
 158         .probe                  = jmicron_init_one,
 159         .remove                 = ata_pci_remove_one,
 160 #ifdef CONFIG_PM
 161         .suspend                = ata_pci_device_suspend,
 162         .resume                 = ata_pci_device_resume,
 163 #endif
 164 };
 165
 166 module_pci_driver(jmicron_pci_driver);
 167
 168 MODULE_AUTHOR("Alan Cox");
 169 MODULE_DESCRIPTION("SCSI low-level driver for Jmicron PATA ports");
 170 MODULE_LICENSE("GPL");
 171 MODULE_DEVICE_TABLE(pci, jmicron_pci_tbl);
 172 MODULE_VERSION(DRV_VERSION);
 173