release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/ide/it8172.c

   1 /*
   2  *
   3  * BRIEF MODULE DESCRIPTION
   4  *      IT8172 IDE controller support
   5  *
   6  * Copyright (C) 2000 MontaVista Software Inc.
   7  * Copyright (C) 2008 Shane McDonald
   8  *
   9  *  This program is free software; you can redistribute  it and/or modify it
  10  *  under  the terms of  the GNU General  Public License as published by the
  11  *  Free Software Foundation;  either version 2 of the  License, or (at your
  12  *  option) any later version.
  13  *
  14  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  15  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  16  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  17  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  18  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  20  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  21  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  22  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  *
  25  *  You should have received a copy of the  GNU General Public License along
  26  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  27  *  675 Mass Ave, Cambridge, MA 02139, USA.
  28  */
  29
  30 #include <linux/module.h>
  31 #include <linux/types.h>
  32 #include <linux/kernel.h>
  33 #include <linux/ioport.h>
  34 #include <linux/pci.h>
  35 #include <linux/ide.h>
  36 #include <linux/init.h>
  37
  38 #define DRV_NAME "IT8172"
  39
  40 static void it8172_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
  41 {
  42         struct pci_dev *dev     = to_pci_dev(hwif->dev);
  43         u16 drive_enables;
  44         u32 drive_timing;
  45         const u8 pio = drive->pio_mode - XFER_PIO_0;
  46
  47         /*
  48          * The highest value of DIOR/DIOW pulse width and recovery time
  49          * that can be set in the IT8172 is 8 PCI clock cycles.  As a result,
  50          * it cannot be configured for PIO mode 0.  This table sets these
  51          * parameters to the maximum supported by the IT8172.
  52          */
  53         static const u8 timings[] = { 0x3f, 0x3c, 0x1b, 0x12, 0x0a };
  54
  55         pci_read_config_word(dev, 0x40, &drive_enables);
  56         pci_read_config_dword(dev, 0x44, &drive_timing);
  57
  58         /*
  59          * Enable port 0x44. The IT8172 spec is confused; it calls
  60          * this register the "Slave IDE Timing Register", but in fact,
  61          * it controls timing for both master and slave drives.
  62          */
  63         drive_enables |= 0x4000;
  64
  65         drive_enables &= drive->dn ? 0xc006 : 0xc060;
  66         if (drive->media == ide_disk)
  67                 /* enable prefetch */
  68                 drive_enables |= 0x0004 << (drive->dn * 4);
  69         if (ide_pio_need_iordy(drive, pio))
  70                 /* enable IORDY sample-point */
  71                 drive_enables |= 0x0002 << (drive->dn * 4);
  72
  73         drive_timing &= drive->dn ? 0x00003f00 : 0x000fc000;
  74         drive_timing |= timings[pio] << (drive->dn * 6 + 8);
  75
  76         pci_write_config_word(dev, 0x40, drive_enables);
  77         pci_write_config_dword(dev, 0x44, drive_timing);
  78 }
  79
  80 static void it8172_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive)
  81 {
  82         struct pci_dev *dev     = to_pci_dev(hwif->dev);
  83         int a_speed             = 3 << (drive->dn * 4);
  84         int u_flag              = 1 << drive->dn;
  85         int u_speed             = 0;
  86         u8 reg48, reg4a;
  87         const u8 speed          = drive->dma_mode;
  88
  89         pci_read_config_byte(dev, 0x48, &reg48);
  90         pci_read_config_byte(dev, 0x4a, &reg4a);
  91
  92         if (speed >= XFER_UDMA_0) {
  93                 u8 udma = speed - XFER_UDMA_0;
  94                 u_speed = udma << (drive->dn * 4);
  95
  96                 pci_write_config_byte(dev, 0x48, reg48 | u_flag);
  97                 reg4a &= ~a_speed;
  98                 pci_write_config_byte(dev, 0x4a, reg4a | u_speed);
  99         } else {
 100                 const u8 mwdma_to_pio[] = { 0, 3, 4 };
 101
 102                 pci_write_config_byte(dev, 0x48, reg48 & ~u_flag);
 103                 pci_write_config_byte(dev, 0x4a, reg4a & ~a_speed);
 104
 105                 drive->pio_mode =
 106                         mwdma_to_pio[speed - XFER_MW_DMA_0] + XFER_PIO_0;
 107
 108                 it8172_set_pio_mode(hwif, drive);
 109         }
 110 }
 111
 112
 113 static const struct ide_port_ops it8172_port_ops = {
 114         .set_pio_mode   = it8172_set_pio_mode,
 115         .set_dma_mode   = it8172_set_dma_mode,
 116 };
 117
 118 static const struct ide_port_info it8172_port_info __devinitdata = {
 119         .name           = DRV_NAME,
 120         .port_ops       = &it8172_port_ops,
 121         .enablebits     = { {0x41, 0x80, 0x80}, {0x00, 0x00, 0x00} },
 122         .host_flags     = IDE_HFLAG_SINGLE,
 123         .pio_mask       = ATA_PIO4 & ~ATA_PIO0,
 124         .mwdma_mask     = ATA_MWDMA2,
 125         .udma_mask      = ATA_UDMA2,
 126 };
 127
 128 static int __devinit it8172_init_one(struct pci_dev *dev,
 129                                         const struct pci_device_id *id)
 130 {
 131         if ((dev->class >> 8) != PCI_CLASS_STORAGE_IDE)
 132                 return -ENODEV; /* IT8172 is more than an IDE controller */
 133         return ide_pci_init_one(dev, &it8172_port_info, NULL);
 134 }
 135
 136 static struct pci_device_id it8172_pci_tbl[] = {
 137         { PCI_VDEVICE(ITE, PCI_DEVICE_ID_ITE_8172), 0 },
 138         { 0, },
 139 };
 140 MODULE_DEVICE_TABLE(pci, it8172_pci_tbl);
 141
 142 static struct pci_driver it8172_pci_driver = {
 143         .name           = "IT8172_IDE",
 144         .id_table       = it8172_pci_tbl,
 145         .probe          = it8172_init_one,
 146         .remove         = ide_pci_remove,
 147         .suspend        = ide_pci_suspend,
 148         .resume         = ide_pci_resume,
 149 };
 150
 151 static int __init it8172_ide_init(void)
 152 {
 153         return ide_pci_register_driver(&it8172_pci_driver);
 154 }
 155
 156 static void __exit it8172_ide_exit(void)
 157 {
 158         pci_unregister_driver(&it8172_pci_driver);
 159 }
 160
 161 module_init(it8172_ide_init);
 162 module_exit(it8172_ide_exit);
 163
 164 MODULE_AUTHOR("Steve Longerbeam");
 165 MODULE_DESCRIPTION("PCI driver module for ITE 8172 IDE");
 166 MODULE_LICENSE("GPL");