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_std_prereset(link, deadline);
  54 }
  55
  56 /**
  57  *      ns87410_error_handler           -       probe reset
  58  *      @ap: ATA port
  59  *
  60  *      Perform the ATA probe and bus reset sequence plus specific handling
  61  *      for this hardware. The MPIIX has the enable bits in a different place
  62  *      to PIIX4 and friends. As a pure PIO device it has no cable detect
  63  */
  64
  65 static void ns87410_error_handler(struct ata_port *ap)
  66 {
  67         ata_bmdma_drive_eh(ap, ns87410_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
  68 }
  69
  70 /**
  71  *      ns87410_set_piomode     -       set initial PIO mode data
  72  *      @ap: ATA interface
  73  *      @adev: ATA device
  74  *
  75  *      Program timing data. This is kept per channel not per device,
  76  *      and only affects the data port.
  77  */
  78
  79 static void ns87410_set_piomode(struct ata_port *ap, struct ata_device *adev)
  80 {
  81         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  82         int port = 0x40 + 4 * ap->port_no;
  83         u8 idetcr, idefr;
  84         struct ata_timing at;
  85
  86         static const u8 activebits[15] = {
  87                 0, 1, 2, 3, 4,
  88                 5, 5, 6, 6, 6,
  89                 6, 7, 7, 7, 7
  90         };
  91
  92         static const u8 recoverbits[12] = {
  93                 0, 1, 2, 3, 4, 5, 6, 6, 7, 7, 7, 7
  94         };
  95
  96         pci_read_config_byte(pdev, port + 3, &idefr);
  97
  98         if (ata_pio_need_iordy(adev))
  99                 idefr |= 0x04;  /* IORDY enable */
 100         else
 101                 idefr &= ~0x04;
 102
 103         if (ata_timing_compute(adev, adev->pio_mode, &at, 30303, 1) < 0) {
 104                 dev_printk(KERN_ERR, &pdev->dev, "unknown mode %d.\n", adev->pio_mode);
 105                 return;
 106         }
 107
 108         at.active = FIT(at.active, 2, 16) - 2;
 109         at.setup = FIT(at.setup, 1, 4) - 1;
 110         at.recover = FIT(at.recover, 1, 12) - 1;
 111
 112         idetcr = (at.setup << 6) | (recoverbits[at.recover] << 3) | activebits[at.active];
 113
 114         pci_write_config_byte(pdev, port, idetcr);
 115         pci_write_config_byte(pdev, port + 3, idefr);
 116         /* We use ap->private_data as a pointer to the device currently
 117            loaded for timing */
 118         ap->private_data = adev;
 119 }
 120
 121 /**
 122  *      ns87410_qc_issue_prot   -       command issue
 123  *      @qc: command pending
 124  *
 125  *      Called when the libata layer is about to issue a command. We wrap
 126  *      this interface so that we can load the correct ATA timings if
 127  *      necessary.
 128  */
 129
 130 static unsigned int ns87410_qc_issue_prot(struct ata_queued_cmd *qc)
 131 {
 132         struct ata_port *ap = qc->ap;
 133         struct ata_device *adev = qc->dev;
 134
 135         /* If modes have been configured and the channel data is not loaded
 136            then load it. We have to check if pio_mode is set as the core code
 137            does not set adev->pio_mode to XFER_PIO_0 while probing as would be
 138            logical */
 139
 140         if (adev->pio_mode && adev != ap->private_data)
 141                 ns87410_set_piomode(ap, adev);
 142
 143         return ata_qc_issue_prot(qc);
 144 }
 145
 146 static struct scsi_host_template ns87410_sht = {
 147         ATA_PIO_SHT(DRV_NAME),
 148 };
 149
 150 static struct ata_port_operations ns87410_port_ops = {
 151         .set_piomode    = ns87410_set_piomode,
 152
 153         .tf_load        = ata_tf_load,
 154         .tf_read        = ata_tf_read,
 155         .check_status   = ata_check_status,
 156         .exec_command   = ata_exec_command,
 157         .dev_select     = ata_std_dev_select,
 158
 159         .freeze         = ata_bmdma_freeze,
 160         .thaw           = ata_bmdma_thaw,
 161         .error_handler  = ns87410_error_handler,
 162         .post_internal_cmd = ata_bmdma_post_internal_cmd,
 163         .cable_detect   = ata_cable_40wire,
 164
 165         .qc_prep        = ata_qc_prep,
 166         .qc_issue       = ns87410_qc_issue_prot,
 167
 168         .data_xfer      = ata_data_xfer,
 169
 170         .irq_handler    = ata_interrupt,
 171         .irq_clear      = ata_noop_irq_clear,
 172         .irq_on         = ata_irq_on,
 173
 174         .port_start     = ata_sff_port_start,
 175 };
 176
 177 static int ns87410_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 178 {
 179         static const struct ata_port_info info = {
 180                 .sht = &ns87410_sht,
 181                 .flags = ATA_FLAG_SLAVE_POSS,
 182                 .pio_mask = 0x0F,
 183                 .port_ops = &ns87410_port_ops
 184         };
 185         const struct ata_port_info *ppi[] = { &info, NULL };
 186         return ata_pci_init_one(dev, ppi);
 187 }
 188
 189 static const struct pci_device_id ns87410[] = {
 190         { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87410), },
 191
 192         { },
 193 };
 194
 195 static struct pci_driver ns87410_pci_driver = {
 196         .name           = DRV_NAME,
 197         .id_table       = ns87410,
 198         .probe          = ns87410_init_one,
 199         .remove         = ata_pci_remove_one,
 200 #ifdef CONFIG_PM
 201         .suspend        = ata_pci_device_suspend,
 202         .resume         = ata_pci_device_resume,
 203 #endif
 204 };
 205
 206 static int __init ns87410_init(void)
 207 {
 208         return pci_register_driver(&ns87410_pci_driver);
 209 }
 210
 211 static void __exit ns87410_exit(void)
 212 {
 213         pci_unregister_driver(&ns87410_pci_driver);
 214 }
 215
 216 MODULE_AUTHOR("Alan Cox");
 217 MODULE_DESCRIPTION("low-level driver for Nat Semi 87410");
 218 MODULE_LICENSE("GPL");
 219 MODULE_DEVICE_TABLE(pci, ns87410);
 220 MODULE_VERSION(DRV_VERSION);
 221
 222 module_init(ns87410_init);
 223 module_exit(ns87410_exit);