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Linux/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 = {
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 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 
135 static struct pci_device_id it8172_pci_tbl[] = {
136         { PCI_VDEVICE(ITE, PCI_DEVICE_ID_ITE_8172), 0 },
137         { 0, },
138 };
139 MODULE_DEVICE_TABLE(pci, it8172_pci_tbl);
140 
141 static 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 
150 static int __init it8172_ide_init(void)
151 {
152         return ide_pci_register_driver(&it8172_pci_driver);
153 }
154 
155 static void __exit it8172_ide_exit(void)
156 {
157         pci_unregister_driver(&it8172_pci_driver);
158 }
159 
160 module_init(it8172_ide_init);
161 module_exit(it8172_ide_exit);
162 
163 MODULE_AUTHOR("Steve Longerbeam");
164 MODULE_DESCRIPTION("PCI driver module for ITE 8172 IDE");
165 MODULE_LICENSE("GPL");
166 

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