linux/drivers/ide/it8172.c
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   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
  40static 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
  80static 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
 113static 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
 118static const struct ide_port_info it8172_port_info = {
 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
 128static int it8172_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 129{
 130        if ((dev->class >> 8) != PCI_CLASS_STORAGE_IDE)
 131                return -ENODEV; /* IT8172 is more than an IDE controller */
 132        return ide_pci_init_one(dev, &it8172_port_info, NULL);
 133}
 134
 135static struct pci_device_id it8172_pci_tbl[] = {
 136        { PCI_VDEVICE(ITE, PCI_DEVICE_ID_ITE_8172), 0 },
 137        { 0, },
 138};
 139MODULE_DEVICE_TABLE(pci, it8172_pci_tbl);
 140
 141static struct pci_driver it8172_pci_driver = {
 142        .name           = "IT8172_IDE",
 143        .id_table       = it8172_pci_tbl,
 144        .probe          = it8172_init_one,
 145        .remove         = ide_pci_remove,
 146        .suspend        = ide_pci_suspend,
 147        .resume         = ide_pci_resume,
 148};
 149
 150static int __init it8172_ide_init(void)
 151{
 152        return ide_pci_register_driver(&it8172_pci_driver);
 153}
 154
 155static void __exit it8172_ide_exit(void)
 156{
 157        pci_unregister_driver(&it8172_pci_driver);
 158}
 159
 160module_init(it8172_ide_init);
 161module_exit(it8172_ide_exit);
 162
 163MODULE_AUTHOR("Steve Longerbeam");
 164MODULE_DESCRIPTION("PCI driver module for ITE 8172 IDE");
 165MODULE_LICENSE("GPL");
 166
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