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/blkdev.h>
  24#include <linux/delay.h>
  25#include <scsi/scsi_host.h>
  26#include <linux/libata.h>
  27
  28#define DRV_NAME "pata_ns87410"
  29#define DRV_VERSION "0.4.6"
  30
  31/**
  32 *      ns87410_pre_reset               -       probe begin
  33 *      @link: ATA link
  34 *      @deadline: deadline jiffies for the operation
  35 *
  36 *      Check enabled ports
  37 */
  38
  39static int ns87410_pre_reset(struct ata_link *link, unsigned long deadline)
  40{
  41        struct ata_port *ap = link->ap;
  42        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  43        static const struct pci_bits ns87410_enable_bits[] = {
  44                { 0x43, 1, 0x08, 0x08 },
  45                { 0x47, 1, 0x08, 0x08 }
  46        };
  47
  48        if (!pci_test_config_bits(pdev, &ns87410_enable_bits[ap->port_no]))
  49                return -ENOENT;
  50
  51        return ata_sff_prereset(link, deadline);
  52}
  53
  54/**
  55 *      ns87410_set_piomode     -       set initial PIO mode data
  56 *      @ap: ATA interface
  57 *      @adev: ATA device
  58 *
  59 *      Program timing data. This is kept per channel not per device,
  60 *      and only affects the data port.
  61 */
  62
  63static void ns87410_set_piomode(struct ata_port *ap, struct ata_device *adev)
  64{
  65        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  66        int port = 0x40 + 4 * ap->port_no;
  67        u8 idetcr, idefr;
  68        struct ata_timing at;
  69
  70        static const u8 activebits[15] = {
  71                0, 1, 2, 3, 4,
  72                5, 5, 6, 6, 6,
  73                6, 7, 7, 7, 7
  74        };
  75
  76        static const u8 recoverbits[12] = {
  77                0, 1, 2, 3, 4, 5, 6, 6, 7, 7, 7, 7
  78        };
  79
  80        pci_read_config_byte(pdev, port + 3, &idefr);
  81
  82        if (ata_pio_need_iordy(adev))
  83                idefr |= 0x04;  /* IORDY enable */
  84        else
  85                idefr &= ~0x04;
  86
  87        if (ata_timing_compute(adev, adev->pio_mode, &at, 30303, 1) < 0) {
  88                dev_err(&pdev->dev, "unknown mode %d\n", adev->pio_mode);
  89                return;
  90        }
  91
  92        at.active = clamp_val(at.active, 2, 16) - 2;
  93        at.setup = clamp_val(at.setup, 1, 4) - 1;
  94        at.recover = clamp_val(at.recover, 1, 12) - 1;
  95
  96        idetcr = (at.setup << 6) | (recoverbits[at.recover] << 3) | activebits[at.active];
  97
  98        pci_write_config_byte(pdev, port, idetcr);
  99        pci_write_config_byte(pdev, port + 3, idefr);
 100        /* We use ap->private_data as a pointer to the device currently
 101           loaded for timing */
 102        ap->private_data = adev;
 103}
 104
 105/**
 106 *      ns87410_qc_issue        -       command issue
 107 *      @qc: command pending
 108 *
 109 *      Called when the libata layer is about to issue a command. We wrap
 110 *      this interface so that we can load the correct ATA timings if
 111 *      necessary.
 112 */
 113
 114static unsigned int ns87410_qc_issue(struct ata_queued_cmd *qc)
 115{
 116        struct ata_port *ap = qc->ap;
 117        struct ata_device *adev = qc->dev;
 118
 119        /* If modes have been configured and the channel data is not loaded
 120           then load it. We have to check if pio_mode is set as the core code
 121           does not set adev->pio_mode to XFER_PIO_0 while probing as would be
 122           logical */
 123
 124        if (adev->pio_mode && adev != ap->private_data)
 125                ns87410_set_piomode(ap, adev);
 126
 127        return ata_sff_qc_issue(qc);
 128}
 129
 130static struct scsi_host_template ns87410_sht = {
 131        ATA_PIO_SHT(DRV_NAME),
 132};
 133
 134static struct ata_port_operations ns87410_port_ops = {
 135        .inherits       = &ata_sff_port_ops,
 136        .qc_issue       = ns87410_qc_issue,
 137        .cable_detect   = ata_cable_40wire,
 138        .set_piomode    = ns87410_set_piomode,
 139        .prereset       = ns87410_pre_reset,
 140};
 141
 142static int ns87410_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 143{
 144        static const struct ata_port_info info = {
 145                .flags = ATA_FLAG_SLAVE_POSS,
 146                .pio_mask = ATA_PIO3,
 147                .port_ops = &ns87410_port_ops
 148        };
 149        const struct ata_port_info *ppi[] = { &info, NULL };
 150        return ata_pci_sff_init_one(dev, ppi, &ns87410_sht, NULL, 0);
 151}
 152
 153static const struct pci_device_id ns87410[] = {
 154        { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87410), },
 155
 156        { },
 157};
 158
 159static struct pci_driver ns87410_pci_driver = {
 160        .name           = DRV_NAME,
 161        .id_table       = ns87410,
 162        .probe          = ns87410_init_one,
 163        .remove         = ata_pci_remove_one,
 164#ifdef CONFIG_PM_SLEEP
 165        .suspend        = ata_pci_device_suspend,
 166        .resume         = ata_pci_device_resume,
 167#endif
 168};
 169
 170module_pci_driver(ns87410_pci_driver);
 171
 172MODULE_AUTHOR("Alan Cox");
 173MODULE_DESCRIPTION("low-level driver for Nat Semi 87410");
 174MODULE_LICENSE("GPL");
 175MODULE_DEVICE_TABLE(pci, ns87410);
 176MODULE_VERSION(DRV_VERSION);
 177