drivers/ata/pata_ns87410.c

   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
  39 static 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
  63 static 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
 114 static 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
 130 static struct scsi_host_template ns87410_sht = {
 131         ATA_PIO_SHT(DRV_NAME),
 132 };
 133
 134 static 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
 142 static 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
 153 static const struct pci_device_id ns87410[] = {
 154         { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87410), },
 155
 156         { },
 157 };
 158
 159 static 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
 170 module_pci_driver(ns87410_pci_driver);
 171
 172 MODULE_AUTHOR("Alan Cox");
 173 MODULE_DESCRIPTION("low-level driver for Nat Semi 87410");
 174 MODULE_LICENSE("GPL");
 175 MODULE_DEVICE_TABLE(pci, ns87410);
 176 MODULE_VERSION(DRV_VERSION);