release/src-rt-6.x/linux/linux-2.6/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  *      @deadline: deadline jiffies for the operation
  37  *
  38  *      Check enabled ports
  39  */
  40
  41 static int ns87410_pre_reset(struct ata_port *ap, unsigned long deadline)
  42 {
  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_std_prereset(ap, deadline);
  53 }
  54
  55 /**
  56  *      ns87410_error_handler           -       probe reset
  57  *      @ap: ATA port
  58  *
  59  *      Perform the ATA probe and bus reset sequence plus specific handling
  60  *      for this hardware. The MPIIX has the enable bits in a different place
  61  *      to PIIX4 and friends. As a pure PIO device it has no cable detect
  62  */
  63
  64 static void ns87410_error_handler(struct ata_port *ap)
  65 {
  66         ata_bmdma_drive_eh(ap, ns87410_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
  67 }
  68
  69 /**
  70  *      ns87410_set_piomode     -       set initial PIO mode data
  71  *      @ap: ATA interface
  72  *      @adev: ATA device
  73  *
  74  *      Program timing data. This is kept per channel not per device,
  75  *      and only affects the data port.
  76  */
  77
  78 static void ns87410_set_piomode(struct ata_port *ap, struct ata_device *adev)
  79 {
  80         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  81         int port = 0x40 + 4 * ap->port_no;
  82         u8 idetcr, idefr;
  83         struct ata_timing at;
  84
  85         static const u8 activebits[15] = {
  86                 0, 1, 2, 3, 4,
  87                 5, 5, 6, 6, 6,
  88                 6, 7, 7, 7, 7
  89         };
  90
  91         static const u8 recoverbits[12] = {
  92                 0, 1, 2, 3, 4, 5, 6, 6, 7, 7, 7, 7
  93         };
  94
  95         pci_read_config_byte(pdev, port + 3, &idefr);
  96
  97         if (ata_pio_need_iordy(adev))
  98                 idefr |= 0x04;  /* IORDY enable */
  99         else
 100                 idefr &= ~0x04;
 101
 102         if (ata_timing_compute(adev, adev->pio_mode, &at, 30303, 1) < 0) {
 103                 dev_printk(KERN_ERR, &pdev->dev, "unknown mode %d.\n", adev->pio_mode);
 104                 return;
 105         }
 106
 107         at.active = FIT(at.active, 2, 16) - 2;
 108         at.setup = FIT(at.setup, 1, 4) - 1;
 109         at.recover = FIT(at.recover, 1, 12) - 1;
 110
 111         idetcr = (at.setup << 6) | (recoverbits[at.recover] << 3) | activebits[at.active];
 112
 113         pci_write_config_byte(pdev, port, idetcr);
 114         pci_write_config_byte(pdev, port + 3, idefr);
 115         /* We use ap->private_data as a pointer to the device currently
 116            loaded for timing */
 117         ap->private_data = adev;
 118 }
 119
 120 /**
 121  *      ns87410_qc_issue_prot   -       command issue
 122  *      @qc: command pending
 123  *
 124  *      Called when the libata layer is about to issue a command. We wrap
 125  *      this interface so that we can load the correct ATA timings if
 126  *      neccessary.
 127  */
 128
 129 static unsigned int ns87410_qc_issue_prot(struct ata_queued_cmd *qc)
 130 {
 131         struct ata_port *ap = qc->ap;
 132         struct ata_device *adev = qc->dev;
 133
 134         /* If modes have been configured and the channel data is not loaded
 135            then load it. We have to check if pio_mode is set as the core code
 136            does not set adev->pio_mode to XFER_PIO_0 while probing as would be
 137            logical */
 138
 139         if (adev->pio_mode && adev != ap->private_data)
 140                 ns87410_set_piomode(ap, adev);
 141
 142         return ata_qc_issue_prot(qc);
 143 }
 144
 145 static struct scsi_host_template ns87410_sht = {
 146         .module                 = THIS_MODULE,
 147         .name                   = DRV_NAME,
 148         .ioctl                  = ata_scsi_ioctl,
 149         .queuecommand           = ata_scsi_queuecmd,
 150         .can_queue              = ATA_DEF_QUEUE,
 151         .this_id                = ATA_SHT_THIS_ID,
 152         .sg_tablesize           = LIBATA_MAX_PRD,
 153         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
 154         .emulated               = ATA_SHT_EMULATED,
 155         .use_clustering         = ATA_SHT_USE_CLUSTERING,
 156         .proc_name              = DRV_NAME,
 157         .dma_boundary           = ATA_DMA_BOUNDARY,
 158         .slave_configure        = ata_scsi_slave_config,
 159         .slave_destroy          = ata_scsi_slave_destroy,
 160         .bios_param             = ata_std_bios_param,
 161 };
 162
 163 static struct ata_port_operations ns87410_port_ops = {
 164         .port_disable   = ata_port_disable,
 165         .set_piomode    = ns87410_set_piomode,
 166
 167         .tf_load        = ata_tf_load,
 168         .tf_read        = ata_tf_read,
 169         .check_status   = ata_check_status,
 170         .exec_command   = ata_exec_command,
 171         .dev_select     = ata_std_dev_select,
 172
 173         .freeze         = ata_bmdma_freeze,
 174         .thaw           = ata_bmdma_thaw,
 175         .error_handler  = ns87410_error_handler,
 176         .post_internal_cmd = ata_bmdma_post_internal_cmd,
 177         .cable_detect   = ata_cable_40wire,
 178
 179         .qc_prep        = ata_qc_prep,
 180         .qc_issue       = ns87410_qc_issue_prot,
 181
 182         .data_xfer      = ata_data_xfer,
 183
 184         .irq_handler    = ata_interrupt,
 185         .irq_clear      = ata_bmdma_irq_clear,
 186         .irq_on         = ata_irq_on,
 187         .irq_ack        = ata_irq_ack,
 188
 189         .port_start     = ata_port_start,
 190 };
 191
 192 static int ns87410_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 193 {
 194         static const struct ata_port_info info = {
 195                 .sht = &ns87410_sht,
 196                 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
 197                 .pio_mask = 0x0F,
 198                 .port_ops = &ns87410_port_ops
 199         };
 200         const struct ata_port_info *ppi[] = { &info, NULL };
 201         return ata_pci_init_one(dev, ppi);
 202 }
 203
 204 static const struct pci_device_id ns87410[] = {
 205         { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87410), },
 206
 207         { },
 208 };
 209
 210 static struct pci_driver ns87410_pci_driver = {
 211         .name           = DRV_NAME,
 212         .id_table       = ns87410,
 213         .probe          = ns87410_init_one,
 214         .remove         = ata_pci_remove_one,
 215 #ifdef CONFIG_PM
 216         .suspend        = ata_pci_device_suspend,
 217         .resume         = ata_pci_device_resume,
 218 #endif
 219 };
 220
 221 static int __init ns87410_init(void)
 222 {
 223         return pci_register_driver(&ns87410_pci_driver);
 224 }
 225
 226 static void __exit ns87410_exit(void)
 227 {
 228         pci_unregister_driver(&ns87410_pci_driver);
 229 }
 230
 231 MODULE_AUTHOR("Alan Cox");
 232 MODULE_DESCRIPTION("low-level driver for Nat Semi 87410");
 233 MODULE_LICENSE("GPL");
 234 MODULE_DEVICE_TABLE(pci, ns87410);
 235 MODULE_VERSION(DRV_VERSION);
 236
 237 module_init(ns87410_init);
 238 module_exit(ns87410_exit);