LXR linux/drivers/ata/pata

   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
  23typedef 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 */
  41static 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
 109static struct scsi_host_template jmicron_sht = {
 110        ATA_BMDMA_SHT(DRV_NAME),
 111};
 112
 113static 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
 133static 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
 149static 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
 155static 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
 166module_pci_driver(jmicron_pci_driver);
 167
 168MODULE_AUTHOR("Alan Cox");
 169MODULE_DESCRIPTION("SCSI low-level driver for Jmicron PATA ports");
 170MODULE_LICENSE("GPL");
 171MODULE_DEVICE_TABLE(pci, jmicron_pci_tbl);
 172MODULE_VERSION(DRV_VERSION);
 173
 174