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/init.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_jmicron"
  22#define DRV_VERSION     "0.1.5"
  23
  24typedef enum {
  25        PORT_PATA0 = 0,
  26        PORT_PATA1 = 1,
  27        PORT_SATA = 2,
  28} port_type;
  29
  30/**
  31 *      jmicron_pre_reset       -       check for 40/80 pin
  32 *      @link: ATA link
  33 *      @deadline: deadline jiffies for the operation
  34 *
  35 *      Perform the PATA port setup we need.
  36 *
  37 *      On the Jmicron 361/363 there is a single PATA port that can be mapped
  38 *      either as primary or secondary (or neither). We don't do any policy
  39 *      and setup here. We assume that has been done by init_one and the
  40 *      BIOS.
  41 */
  42static int jmicron_pre_reset(struct ata_link *link, unsigned long deadline)
  43{
  44        struct ata_port *ap = link->ap;
  45        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  46        u32 control;
  47        u32 control5;
  48        int port_mask = 1<< (4 * ap->port_no);
  49        int port = ap->port_no;
  50        port_type port_map[2];
  51
  52        /* Check if our port is enabled */
  53        pci_read_config_dword(pdev, 0x40, &control);
  54        if ((control & port_mask) == 0)
  55                return -ENOENT;
  56
  57        /* There are two basic mappings. One has the two SATA ports merged
  58           as master/slave and the secondary as PATA, the other has only the
  59           SATA port mapped */
  60        if (control & (1 << 23)) {
  61                port_map[0] = PORT_SATA;
  62                port_map[1] = PORT_PATA0;
  63        } else {
  64                port_map[0] = PORT_SATA;
  65                port_map[1] = PORT_SATA;
  66        }
  67
  68        /* The 365/366 may have this bit set to map the second PATA port
  69           as the internal primary channel */
  70        pci_read_config_dword(pdev, 0x80, &control5);
  71        if (control5 & (1<<24))
  72                port_map[0] = PORT_PATA1;
  73
  74        /* The two ports may then be logically swapped by the firmware */
  75        if (control & (1 << 22))
  76                port = port ^ 1;
  77
  78        /*
  79         *      Now we know which physical port we are talking about we can
  80         *      actually do our cable checking etc. Thankfully we don't need
  81         *      to do the plumbing for other cases.
  82         */
  83        switch (port_map[port]) {
  84        case PORT_PATA0:
  85                if ((control & (1 << 5)) == 0)
  86                        return -ENOENT;
  87                if (control & (1 << 3)) /* 40/80 pin primary */
  88                        ap->cbl = ATA_CBL_PATA40;
  89                else
  90                        ap->cbl = ATA_CBL_PATA80;
  91                break;
  92        case PORT_PATA1:
  93                /* Bit 21 is set if the port is enabled */
  94                if ((control5 & (1 << 21)) == 0)
  95                        return -ENOENT;
  96                if (control5 & (1 << 19))       /* 40/80 pin secondary */
  97                        ap->cbl = ATA_CBL_PATA40;
  98                else
  99                        ap->cbl = ATA_CBL_PATA80;
 100                break;
 101        case PORT_SATA:
 102                ap->cbl = ATA_CBL_SATA;
 103                break;
 104        }
 105        return ata_sff_prereset(link, deadline);
 106}
 107
 108/* No PIO or DMA methods needed for this device */
 109
 110static struct scsi_host_template jmicron_sht = {
 111        ATA_BMDMA_SHT(DRV_NAME),
 112};
 113
 114static struct ata_port_operations jmicron_ops = {
 115        .inherits               = &ata_bmdma_port_ops,
 116        .prereset               = jmicron_pre_reset,
 117};
 118
 119
 120/**
 121 *      jmicron_init_one - Register Jmicron ATA PCI device with kernel services
 122 *      @pdev: PCI device to register
 123 *      @ent: Entry in jmicron_pci_tbl matching with @pdev
 124 *
 125 *      Called from kernel PCI layer.
 126 *
 127 *      LOCKING:
 128 *      Inherited from PCI layer (may sleep).
 129 *
 130 *      RETURNS:
 131 *      Zero on success, or -ERRNO value.
 132 */
 133
 134static int jmicron_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
 135{
 136        static const struct ata_port_info info = {
 137                .flags  = ATA_FLAG_SLAVE_POSS,
 138
 139                .pio_mask       = ATA_PIO4,
 140                .mwdma_mask     = ATA_MWDMA2,
 141                .udma_mask      = ATA_UDMA5,
 142
 143                .port_ops       = &jmicron_ops,
 144        };
 145        const struct ata_port_info *ppi[] = { &info, NULL };
 146
 147        return ata_pci_bmdma_init_one(pdev, ppi, &jmicron_sht, NULL, 0);
 148}
 149
 150static const struct pci_device_id jmicron_pci_tbl[] = {
 151        { PCI_VENDOR_ID_JMICRON, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
 152          PCI_CLASS_STORAGE_IDE << 8, 0xffff00, 0 },
 153        { }     /* terminate list */
 154};
 155
 156static struct pci_driver jmicron_pci_driver = {
 157        .name                   = DRV_NAME,
 158        .id_table               = jmicron_pci_tbl,
 159        .probe                  = jmicron_init_one,
 160        .remove                 = ata_pci_remove_one,
 161#ifdef CONFIG_PM
 162        .suspend                = ata_pci_device_suspend,
 163        .resume                 = ata_pci_device_resume,
 164#endif
 165};
 166
 167static int __init jmicron_init(void)
 168{
 169        return pci_register_driver(&jmicron_pci_driver);
 170}
 171
 172static void __exit jmicron_exit(void)
 173{
 174        pci_unregister_driver(&jmicron_pci_driver);
 175}
 176
 177module_init(jmicron_init);
 178module_exit(jmicron_exit);
 179
 180MODULE_AUTHOR("Alan Cox");
 181MODULE_DESCRIPTION("SCSI low-level driver for Jmicron PATA ports");
 182MODULE_LICENSE("GPL");
 183MODULE_DEVICE_TABLE(pci, jmicron_pci_tbl);
 184MODULE_VERSION(DRV_VERSION);
 185
 186