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  *      @ap: ATA port
  36  *
  37  *      Check enabled ports
  38  */
  39
  40 static int ns87410_pre_reset(struct ata_port *ap)
  41 {
  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         return ata_std_prereset(ap);
  51 }
  52
  53 /**
  54  *      ns87410_error_handler           -       probe reset
  55  *      @ap: ATA port
  56  *
  57  *      Perform the ATA probe and bus reset sequence plus specific handling
  58  *      for this hardware. The MPIIX has the enable bits in a different place
  59  *      to PIIX4 and friends. As a pure PIO device it has no cable detect
  60  */
  61
  62 static void ns87410_error_handler(struct ata_port *ap)
  63 {
  64         ata_bmdma_drive_eh(ap, ns87410_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
  65 }
  66
  67 /**
  68  *      ns87410_set_piomode     -       set initial PIO mode data
  69  *      @ap: ATA interface
  70  *      @adev: ATA device
  71  *
  72  *      Program timing data. This is kept per channel not per device,
  73  *      and only affects the data port.
  74  */
  75
  76 static void ns87410_set_piomode(struct ata_port *ap, struct ata_device *adev)
  77 {
  78         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  79         int port = 0x40 + 4 * ap->port_no;
  80         u8 idetcr, idefr;
  81         struct ata_timing at;
  82
  83         static const u8 activebits[15] = {
  84                 0, 1, 2, 3, 4,
  85                 5, 5, 6, 6, 6,
  86                 6, 7, 7, 7, 7
  87         };
  88
  89         static const u8 recoverbits[12] = {
  90                 0, 1, 2, 3, 4, 5, 6, 6, 7, 7, 7, 7
  91         };
  92
  93         pci_read_config_byte(pdev, port + 3, &idefr);
  94
  95         if (ata_pio_need_iordy(adev))
  96                 idefr |= 0x04;  /* IORDY enable */
  97         else
  98                 idefr &= ~0x04;
  99
 100         if (ata_timing_compute(adev, adev->pio_mode, &at, 30303, 1) < 0) {
 101                 dev_printk(KERN_ERR, &pdev->dev, "unknown mode %d.\n", adev->pio_mode);
 102                 return;
 103         }
 104
 105         at.active = FIT(at.active, 2, 16) - 2;
 106         at.setup = FIT(at.setup, 1, 4) - 1;
 107         at.recover = FIT(at.recover, 1, 12) - 1;
 108
 109         idetcr = (at.setup << 6) | (recoverbits[at.recover] << 3) | activebits[at.active];
 110
 111         pci_write_config_byte(pdev, port, idetcr);
 112         pci_write_config_byte(pdev, port + 3, idefr);
 113         /* We use ap->private_data as a pointer to the device currently
 114            loaded for timing */
 115         ap->private_data = adev;
 116 }
 117
 118 /**
 119  *      ns87410_qc_issue_prot   -       command issue
 120  *      @qc: command pending
 121  *
 122  *      Called when the libata layer is about to issue a command. We wrap
 123  *      this interface so that we can load the correct ATA timings if
 124  *      neccessary.
 125  */
 126
 127 static unsigned int ns87410_qc_issue_prot(struct ata_queued_cmd *qc)
 128 {
 129         struct ata_port *ap = qc->ap;
 130         struct ata_device *adev = qc->dev;
 131
 132         /* If modes have been configured and the channel data is not loaded
 133            then load it. We have to check if pio_mode is set as the core code
 134            does not set adev->pio_mode to XFER_PIO_0 while probing as would be
 135            logical */
 136
 137         if (adev->pio_mode && adev != ap->private_data)
 138                 ns87410_set_piomode(ap, adev);
 139
 140         return ata_qc_issue_prot(qc);
 141 }
 142
 143 static struct scsi_host_template ns87410_sht = {
 144         .module                 = THIS_MODULE,
 145         .name                   = DRV_NAME,
 146         .ioctl                  = ata_scsi_ioctl,
 147         .queuecommand           = ata_scsi_queuecmd,
 148         .can_queue              = ATA_DEF_QUEUE,
 149         .this_id                = ATA_SHT_THIS_ID,
 150         .sg_tablesize           = LIBATA_MAX_PRD,
 151         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
 152         .emulated               = ATA_SHT_EMULATED,
 153         .use_clustering         = ATA_SHT_USE_CLUSTERING,
 154         .proc_name              = DRV_NAME,
 155         .dma_boundary           = ATA_DMA_BOUNDARY,
 156         .slave_configure        = ata_scsi_slave_config,
 157         .slave_destroy          = ata_scsi_slave_destroy,
 158         .bios_param             = ata_std_bios_param,
 159 #ifdef CONFIG_PM
 160         .resume                 = ata_scsi_device_resume,
 161         .suspend                = ata_scsi_device_suspend,
 162 #endif
 163 };
 164
 165 static struct ata_port_operations ns87410_port_ops = {
 166         .port_disable   = ata_port_disable,
 167         .set_piomode    = ns87410_set_piomode,
 168
 169         .tf_load        = ata_tf_load,
 170         .tf_read        = ata_tf_read,
 171         .check_status   = ata_check_status,
 172         .exec_command   = ata_exec_command,
 173         .dev_select     = ata_std_dev_select,
 174
 175         .freeze         = ata_bmdma_freeze,
 176         .thaw           = ata_bmdma_thaw,
 177         .error_handler  = ns87410_error_handler,
 178         .post_internal_cmd = ata_bmdma_post_internal_cmd,
 179         .cable_detect   = ata_cable_40wire,
 180
 181         .qc_prep        = ata_qc_prep,
 182         .qc_issue       = ns87410_qc_issue_prot,
 183
 184         .data_xfer      = ata_data_xfer,
 185
 186         .irq_handler    = ata_interrupt,
 187         .irq_clear      = ata_bmdma_irq_clear,
 188         .irq_on         = ata_irq_on,
 189         .irq_ack        = ata_irq_ack,
 190
 191         .port_start     = ata_port_start,
 192 };
 193
 194 static int ns87410_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 195 {
 196         static struct ata_port_info info = {
 197                 .sht = &ns87410_sht,
 198                 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
 199                 .pio_mask = 0x0F,
 200                 .port_ops = &ns87410_port_ops
 201         };
 202         static struct ata_port_info *port_info[2] = {&info, &info};
 203         return ata_pci_init_one(dev, port_info, 2);
 204 }
 205
 206 static const struct pci_device_id ns87410[] = {
 207         { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87410), },
 208
 209         { },
 210 };
 211
 212 static struct pci_driver ns87410_pci_driver = {
 213         .name           = DRV_NAME,
 214         .id_table       = ns87410,
 215         .probe          = ns87410_init_one,
 216         .remove         = ata_pci_remove_one,
 217 #ifdef CONFIG_PM
 218         .suspend        = ata_pci_device_suspend,
 219         .resume         = ata_pci_device_resume,
 220 #endif
 221 };
 222
 223 static int __init ns87410_init(void)
 224 {
 225         return pci_register_driver(&ns87410_pci_driver);
 226 }
 227
 228 static void __exit ns87410_exit(void)
 229 {
 230         pci_unregister_driver(&ns87410_pci_driver);
 231 }
 232
 233 MODULE_AUTHOR("Alan Cox");
 234 MODULE_DESCRIPTION("low-level driver for Nat Semi 87410");
 235 MODULE_LICENSE("GPL");
 236 MODULE_DEVICE_TABLE(pci, ns87410);
 237 MODULE_VERSION(DRV_VERSION);
 238
 239 module_init(ns87410_init);
 240 module_exit(ns87410_exit);