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  *                        Alan Cox <alan@redhat.com>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2, or (at your option)
   9  *  any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; see the file COPYING.  If not, write to
  18  *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include <linux/pci.h>
  24 #include <linux/init.h>
  25 #include <linux/blkdev.h>
  26 #include <linux/delay.h>
  27 #include <scsi/scsi_host.h>
  28 #include <linux/libata.h>
  29
  30 #define DRV_NAME "pata_ns87410"
  31 #define DRV_VERSION "0.4.6"
  32
  33 /**
  34  *      ns87410_pre_reset               -       probe begin
  35  *      @link: ATA link
  36  *      @deadline: deadline jiffies for the operation
  37  *
  38  *      Check enabled ports
  39  */
  40
  41 static int ns87410_pre_reset(struct ata_link *link, unsigned long deadline)
  42 {
  43         struct ata_port *ap = link->ap;
  44         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  45         static const struct pci_bits ns87410_enable_bits[] = {
  46                 { 0x43, 1, 0x08, 0x08 },
  47                 { 0x47, 1, 0x08, 0x08 }
  48         };
  49
  50         if (!pci_test_config_bits(pdev, &ns87410_enable_bits[ap->port_no]))
  51                 return -ENOENT;
  52
  53         return ata_sff_prereset(link, deadline);
  54 }
  55
  56 /**
  57  *      ns87410_set_piomode     -       set initial PIO mode data
  58  *      @ap: ATA interface
  59  *      @adev: ATA device
  60  *
  61  *      Program timing data. This is kept per channel not per device,
  62  *      and only affects the data port.
  63  */
  64
  65 static void ns87410_set_piomode(struct ata_port *ap, struct ata_device *adev)
  66 {
  67         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  68         int port = 0x40 + 4 * ap->port_no;
  69         u8 idetcr, idefr;
  70         struct ata_timing at;
  71
  72         static const u8 activebits[15] = {
  73                 0, 1, 2, 3, 4,
  74                 5, 5, 6, 6, 6,
  75                 6, 7, 7, 7, 7
  76         };
  77
  78         static const u8 recoverbits[12] = {
  79                 0, 1, 2, 3, 4, 5, 6, 6, 7, 7, 7, 7
  80         };
  81
  82         pci_read_config_byte(pdev, port + 3, &idefr);
  83
  84         if (ata_pio_need_iordy(adev))
  85                 idefr |= 0x04;  /* IORDY enable */
  86         else
  87                 idefr &= ~0x04;
  88
  89         if (ata_timing_compute(adev, adev->pio_mode, &at, 30303, 1) < 0) {
  90                 dev_printk(KERN_ERR, &pdev->dev, "unknown mode %d.\n", adev->pio_mode);
  91                 return;
  92         }
  93
  94         at.active = clamp_val(at.active, 2, 16) - 2;
  95         at.setup = clamp_val(at.setup, 1, 4) - 1;
  96         at.recover = clamp_val(at.recover, 1, 12) - 1;
  97
  98         idetcr = (at.setup << 6) | (recoverbits[at.recover] << 3) | activebits[at.active];
  99
 100         pci_write_config_byte(pdev, port, idetcr);
 101         pci_write_config_byte(pdev, port + 3, idefr);
 102         /* We use ap->private_data as a pointer to the device currently
 103            loaded for timing */
 104         ap->private_data = adev;
 105 }
 106
 107 /**
 108  *      ns87410_qc_issue        -       command issue
 109  *      @qc: command pending
 110  *
 111  *      Called when the libata layer is about to issue a command. We wrap
 112  *      this interface so that we can load the correct ATA timings if
 113  *      necessary.
 114  */
 115
 116 static unsigned int ns87410_qc_issue(struct ata_queued_cmd *qc)
 117 {
 118         struct ata_port *ap = qc->ap;
 119         struct ata_device *adev = qc->dev;
 120
 121         /* If modes have been configured and the channel data is not loaded
 122            then load it. We have to check if pio_mode is set as the core code
 123            does not set adev->pio_mode to XFER_PIO_0 while probing as would be
 124            logical */
 125
 126         if (adev->pio_mode && adev != ap->private_data)
 127                 ns87410_set_piomode(ap, adev);
 128
 129         return ata_sff_qc_issue(qc);
 130 }
 131
 132 static struct scsi_host_template ns87410_sht = {
 133         ATA_PIO_SHT(DRV_NAME),
 134 };
 135
 136 static struct ata_port_operations ns87410_port_ops = {
 137         .inherits       = &ata_sff_port_ops,
 138         .qc_issue       = ns87410_qc_issue,
 139         .cable_detect   = ata_cable_40wire,
 140         .set_piomode    = ns87410_set_piomode,
 141         .prereset       = ns87410_pre_reset,
 142 };
 143
 144 static int ns87410_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 145 {
 146         static const struct ata_port_info info = {
 147                 .flags = ATA_FLAG_SLAVE_POSS,
 148                 .pio_mask = 0x0F,
 149                 .port_ops = &ns87410_port_ops
 150         };
 151         const struct ata_port_info *ppi[] = { &info, NULL };
 152         return ata_pci_sff_init_one(dev, ppi, &ns87410_sht, NULL);
 153 }
 154
 155 static const struct pci_device_id ns87410[] = {
 156         { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87410), },
 157
 158         { },
 159 };
 160
 161 static struct pci_driver ns87410_pci_driver = {
 162         .name           = DRV_NAME,
 163         .id_table       = ns87410,
 164         .probe          = ns87410_init_one,
 165         .remove         = ata_pci_remove_one,
 166 #ifdef CONFIG_PM
 167         .suspend        = ata_pci_device_suspend,
 168         .resume         = ata_pci_device_resume,
 169 #endif
 170 };
 171
 172 static int __init ns87410_init(void)
 173 {
 174         return pci_register_driver(&ns87410_pci_driver);
 175 }
 176
 177 static void __exit ns87410_exit(void)
 178 {
 179         pci_unregister_driver(&ns87410_pci_driver);
 180 }
 181
 182 MODULE_AUTHOR("Alan Cox");
 183 MODULE_DESCRIPTION("low-level driver for Nat Semi 87410");
 184 MODULE_LICENSE("GPL");
 185 MODULE_DEVICE_TABLE(pci, ns87410);
 186 MODULE_VERSION(DRV_VERSION);
 187
 188 module_init(ns87410_init);
 189 module_exit(ns87410_exit);