LXR linux/drivers/ata/pata

   1/*
   2 * pata_ns87410.c       - National Semiconductor 87410 PATA for new ATA layer
   3 *                        (C) 2006 Red Hat Inc
   4 *
   5 *  This program is free software; you can redistribute it and/or modify
   6 *  it under the terms of the GNU General Public License as published by
   7 *  the Free Software Foundation; either version 2, or (at your option)
   8 *  any later version.
   9 *
  10 *  This program is distributed in the hope that it will be useful,
  11 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 *  GNU General Public License for more details.
  14 *
  15 *  You should have received a copy of the GNU General Public License
  16 *  along with this program; see the file COPYING.  If not, write to
  17 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  18 */
  19
  20#include <linux/kernel.h>
  21#include <linux/module.h>
  22#include <linux/pci.h>
  23#include <linux/init.h>
  24#include <linux/blkdev.h>
  25#include <linux/delay.h>
  26#include <scsi/scsi_host.h>
  27#include <linux/libata.h>
  28
  29#define DRV_NAME "pata_ns87410"
  30#define DRV_VERSION "0.4.6"
  31
  32/**
  33 *      ns87410_pre_reset               -       probe begin
  34 *      @link: ATA link
  35 *      @deadline: deadline jiffies for the operation
  36 *
  37 *      Check enabled ports
  38 */
  39
  40static int ns87410_pre_reset(struct ata_link *link, unsigned long deadline)
  41{
  42        struct ata_port *ap = link->ap;
  43        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  44        static const struct pci_bits ns87410_enable_bits[] = {
  45                { 0x43, 1, 0x08, 0x08 },
  46                { 0x47, 1, 0x08, 0x08 }
  47        };
  48
  49        if (!pci_test_config_bits(pdev, &ns87410_enable_bits[ap->port_no]))
  50                return -ENOENT;
  51
  52        return ata_sff_prereset(link, deadline);
  53}
  54
  55/**
  56 *      ns87410_set_piomode     -       set initial PIO mode data
  57 *      @ap: ATA interface
  58 *      @adev: ATA device
  59 *
  60 *      Program timing data. This is kept per channel not per device,
  61 *      and only affects the data port.
  62 */
  63
  64static void ns87410_set_piomode(struct ata_port *ap, struct ata_device *adev)
  65{
  66        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  67        int port = 0x40 + 4 * ap->port_no;
  68        u8 idetcr, idefr;
  69        struct ata_timing at;
  70
  71        static const u8 activebits[15] = {
  72                0, 1, 2, 3, 4,
  73                5, 5, 6, 6, 6,
  74                6, 7, 7, 7, 7
  75        };
  76
  77        static const u8 recoverbits[12] = {
  78                0, 1, 2, 3, 4, 5, 6, 6, 7, 7, 7, 7
  79        };
  80
  81        pci_read_config_byte(pdev, port + 3, &idefr);
  82
  83        if (ata_pio_need_iordy(adev))
  84                idefr |= 0x04;  /* IORDY enable */
  85        else
  86                idefr &= ~0x04;
  87
  88        if (ata_timing_compute(adev, adev->pio_mode, &at, 30303, 1) < 0) {
  89                dev_printk(KERN_ERR, &pdev->dev, "unknown mode %d.\n", adev->pio_mode);
  90                return;
  91        }
  92
  93        at.active = clamp_val(at.active, 2, 16) - 2;
  94        at.setup = clamp_val(at.setup, 1, 4) - 1;
  95        at.recover = clamp_val(at.recover, 1, 12) - 1;
  96
  97        idetcr = (at.setup << 6) | (recoverbits[at.recover] << 3) | activebits[at.active];
  98
  99        pci_write_config_byte(pdev, port, idetcr);
 100        pci_write_config_byte(pdev, port + 3, idefr);
 101        /* We use ap->private_data as a pointer to the device currently
 102           loaded for timing */
 103        ap->private_data = adev;
 104}
 105
 106/**
 107 *      ns87410_qc_issue        -       command issue
 108 *      @qc: command pending
 109 *
 110 *      Called when the libata layer is about to issue a command. We wrap
 111 *      this interface so that we can load the correct ATA timings if
 112 *      necessary.
 113 */
 114
 115static unsigned int ns87410_qc_issue(struct ata_queued_cmd *qc)
 116{
 117        struct ata_port *ap = qc->ap;
 118        struct ata_device *adev = qc->dev;
 119
 120        /* If modes have been configured and the channel data is not loaded
 121           then load it. We have to check if pio_mode is set as the core code
 122           does not set adev->pio_mode to XFER_PIO_0 while probing as would be
 123           logical */
 124
 125        if (adev->pio_mode && adev != ap->private_data)
 126                ns87410_set_piomode(ap, adev);
 127
 128        return ata_sff_qc_issue(qc);
 129}
 130
 131static struct scsi_host_template ns87410_sht = {
 132        ATA_PIO_SHT(DRV_NAME),
 133};
 134
 135static struct ata_port_operations ns87410_port_ops = {
 136        .inherits       = &ata_sff_port_ops,
 137        .qc_issue       = ns87410_qc_issue,
 138        .cable_detect   = ata_cable_40wire,
 139        .set_piomode    = ns87410_set_piomode,
 140        .prereset       = ns87410_pre_reset,
 141};
 142
 143static int ns87410_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 144{
 145        static const struct ata_port_info info = {
 146                .flags = ATA_FLAG_SLAVE_POSS,
 147                .pio_mask = ATA_PIO3,
 148                .port_ops = &ns87410_port_ops
 149        };
 150        const struct ata_port_info *ppi[] = { &info, NULL };
 151        return ata_pci_sff_init_one(dev, ppi, &ns87410_sht, NULL, 0);
 152}
 153
 154static const struct pci_device_id ns87410[] = {
 155        { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87410), },
 156
 157        { },
 158};
 159
 160static struct pci_driver ns87410_pci_driver = {
 161        .name           = DRV_NAME,
 162        .id_table       = ns87410,
 163        .probe          = ns87410_init_one,
 164        .remove         = ata_pci_remove_one,
 165#ifdef CONFIG_PM
 166        .suspend        = ata_pci_device_suspend,
 167        .resume         = ata_pci_device_resume,
 168#endif
 169};
 170
 171static int __init ns87410_init(void)
 172{
 173        return pci_register_driver(&ns87410_pci_driver);
 174}
 175
 176static void __exit ns87410_exit(void)
 177{
 178        pci_unregister_driver(&ns87410_pci_driver);
 179}
 180
 181MODULE_AUTHOR("Alan Cox");
 182MODULE_DESCRIPTION("low-level driver for Nat Semi 87410");
 183MODULE_LICENSE("GPL");
 184MODULE_DEVICE_TABLE(pci, ns87410);
 185MODULE_VERSION(DRV_VERSION);
 186
 187module_init(ns87410_init);
 188module_exit(ns87410_exit);
 189