release/src-rt-6.x.4708/linux/linux-2.6.36/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/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
  40 static 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
  64 static 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
 115 static 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
 131 static struct scsi_host_template ns87410_sht = {
 132         ATA_PIO_SHT(DRV_NAME),
 133 };
 134
 135 static 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
 143 static 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
 154 static const struct pci_device_id ns87410[] = {
 155         { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87410), },
 156
 157         { },
 158 };
 159
 160 static 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
 171 static int __init ns87410_init(void)
 172 {
 173         return pci_register_driver(&ns87410_pci_driver);
 174 }
 175
 176 static void __exit ns87410_exit(void)
 177 {
 178         pci_unregister_driver(&ns87410_pci_driver);
 179 }
 180
 181 MODULE_AUTHOR("Alan Cox");
 182 MODULE_DESCRIPTION("low-level driver for Nat Semi 87410");
 183 MODULE_LICENSE("GPL");
 184 MODULE_DEVICE_TABLE(pci, ns87410);
 185 MODULE_VERSION(DRV_VERSION);
 186
 187 module_init(ns87410_init);
 188 module_exit(ns87410_exit);