391ad1908a
Support for the IT8172 IDE controller was removed from the kernel sometime after 2.6.18. Support for the only boards that used the IT8172 was removed from the kernel after 2.6.18, as they had never compiled since 2.6.0. However, there are a couple of platforms that use this chip: the PMC-Sierra Xiao Hu thin-client computer, which is no longer in production, and the Linksys NSS4000 Network Attached Storage box, which is based on the Xiao Hu board. I am attempting to add support for the Xiao Hu to the kernel, and this IT8172 IDE controller is the first bit of code in this effort. This patch resurrects the IT8172 IDE controller code. I began with the 2.6.18 version of the it8172.c file, and have moved it forward so that it works with the latest version of the kernel. I have run this driver on a PMC-Sierra Xiao Hu board with the 2.6.28 kernel, and I have had no problems with it in my configuration. The attached patch applies cleanly against 2.6.28. Signed-off-by: Shane McDonald <mcdonald.shane@gmail.com> Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com> Cc: alan@lxorguk.ukuu.org.uk [bart: s/HWIF(drive)/drive->hwif/] Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
166 lines
5 KiB
C
166 lines
5 KiB
C
/*
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*
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* BRIEF MODULE DESCRIPTION
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* IT8172 IDE controller support
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*
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* Copyright (C) 2000 MontaVista Software Inc.
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* Copyright (C) 2008 Shane McDonald
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/ioport.h>
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#include <linux/pci.h>
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#include <linux/ide.h>
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#include <linux/init.h>
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#define DRV_NAME "IT8172"
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static void it8172_set_pio_mode(ide_drive_t *drive, const u8 pio)
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{
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ide_hwif_t *hwif = drive->hwif;
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struct pci_dev *dev = to_pci_dev(hwif->dev);
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u16 drive_enables;
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u32 drive_timing;
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/*
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* The highest value of DIOR/DIOW pulse width and recovery time
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* that can be set in the IT8172 is 8 PCI clock cycles. As a result,
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* it cannot be configured for PIO mode 0. This table sets these
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* parameters to the maximum supported by the IT8172.
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*/
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static const u8 timings[] = { 0x3f, 0x3c, 0x1b, 0x12, 0x0a };
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pci_read_config_word(dev, 0x40, &drive_enables);
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pci_read_config_dword(dev, 0x44, &drive_timing);
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/*
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* Enable port 0x44. The IT8172 spec is confused; it calls
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* this register the "Slave IDE Timing Register", but in fact,
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* it controls timing for both master and slave drives.
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*/
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drive_enables |= 0x4000;
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drive_enables &= drive->dn ? 0xc006 : 0xc060;
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if (drive->media == ide_disk)
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/* enable prefetch */
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drive_enables |= 0x0004 << (drive->dn * 4);
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if (ata_id_has_iordy(drive->id))
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/* enable IORDY sample-point */
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drive_enables |= 0x0002 << (drive->dn * 4);
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drive_timing &= drive->dn ? 0x00003f00 : 0x000fc000;
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drive_timing |= timings[pio] << (drive->dn * 6 + 8);
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pci_write_config_word(dev, 0x40, drive_enables);
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pci_write_config_dword(dev, 0x44, drive_timing);
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}
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static void it8172_set_dma_mode(ide_drive_t *drive, const u8 speed)
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{
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ide_hwif_t *hwif = drive->hwif;
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struct pci_dev *dev = to_pci_dev(hwif->dev);
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int a_speed = 3 << (drive->dn * 4);
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int u_flag = 1 << drive->dn;
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int u_speed = 0;
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u8 reg48, reg4a;
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pci_read_config_byte(dev, 0x48, ®48);
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pci_read_config_byte(dev, 0x4a, ®4a);
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if (speed >= XFER_UDMA_0) {
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u8 udma = speed - XFER_UDMA_0;
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u_speed = udma << (drive->dn * 4);
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pci_write_config_byte(dev, 0x48, reg48 | u_flag);
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reg4a &= ~a_speed;
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pci_write_config_byte(dev, 0x4a, reg4a | u_speed);
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} else {
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const u8 mwdma_to_pio[] = { 0, 3, 4 };
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u8 pio;
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pci_write_config_byte(dev, 0x48, reg48 & ~u_flag);
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pci_write_config_byte(dev, 0x4a, reg4a & ~a_speed);
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pio = mwdma_to_pio[speed - XFER_MW_DMA_0];
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it8172_set_pio_mode(drive, pio);
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}
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}
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static const struct ide_port_ops it8172_port_ops = {
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.set_pio_mode = it8172_set_pio_mode,
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.set_dma_mode = it8172_set_dma_mode,
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};
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static const struct ide_port_info it8172_port_info __devinitdata = {
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.name = DRV_NAME,
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.port_ops = &it8172_port_ops,
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.enablebits = { {0x41, 0x80, 0x80}, {0x00, 0x00, 0x00} },
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.host_flags = IDE_HFLAG_SINGLE,
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.pio_mask = ATA_PIO4 & ~ATA_PIO0,
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.mwdma_mask = ATA_MWDMA2,
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.udma_mask = ATA_UDMA2,
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};
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static int __devinit it8172_init_one(struct pci_dev *dev,
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const struct pci_device_id *id)
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{
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if ((dev->class >> 8) != PCI_CLASS_STORAGE_IDE)
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return -ENODEV; /* IT8172 is more than an IDE controller */
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return ide_pci_init_one(dev, &it8172_port_info, NULL);
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}
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static struct pci_device_id it8172_pci_tbl[] = {
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{ PCI_VDEVICE(ITE, PCI_DEVICE_ID_ITE_8172), 0 },
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{ 0, },
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};
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MODULE_DEVICE_TABLE(pci, it8172_pci_tbl);
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static struct pci_driver it8172_pci_driver = {
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.name = "IT8172_IDE",
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.id_table = it8172_pci_tbl,
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.probe = it8172_init_one,
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.remove = ide_pci_remove,
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.suspend = ide_pci_suspend,
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.resume = ide_pci_resume,
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};
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static int __init it8172_ide_init(void)
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{
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return ide_pci_register_driver(&it8172_pci_driver);
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}
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static void __exit it8172_ide_exit(void)
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{
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pci_unregister_driver(&it8172_pci_driver);
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}
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module_init(it8172_ide_init);
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module_exit(it8172_ide_exit);
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MODULE_AUTHOR("Steve Longerbeam");
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MODULE_DESCRIPTION("PCI driver module for ITE 8172 IDE");
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MODULE_LICENSE("GPL");
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