3 files changed, 174 insertions, 0 deletions

diff --git a/drivers/ide/Kconfig b/drivers/ide/Kconfig
index 4ee85fcf9aaf..3f9503867e6b 100644
--- a/drivers/ide/Kconfig
+++ b/drivers/ide/Kconfig
@@ -511,6 +511,13 @@ config BLK_DEV_PIIX
           This allows the kernel to change PIO, DMA and UDMA speeds and to
           configure the chip to optimum performance.
 
+config BLK_DEV_IT8172
+        tristate "IT8172 IDE support"
+        select BLK_DEV_IDEDMA_PCI
+        help
+          This driver adds support for the IDE controller on the
+          IT8172 System Controller.
+
 config BLK_DEV_IT8213
         tristate "IT8213 IDE support"
         select BLK_DEV_IDEDMA_PCI
diff --git a/drivers/ide/Makefile b/drivers/ide/Makefile
index 410728992e6a..c2b9c93f0095 100644
--- a/drivers/ide/Makefile
+++ b/drivers/ide/Makefile
@@ -47,6 +47,7 @@ obj-$(CONFIG_BLK_DEV_SC1200)		+= sc1200.o
 obj-$(CONFIG_BLK_DEV_CY82C693)          += cy82c693.o
 obj-$(CONFIG_BLK_DEV_DELKIN)            += delkin_cb.o
 obj-$(CONFIG_BLK_DEV_HPT366)            += hpt366.o
+obj-$(CONFIG_BLK_DEV_IT8172)            += it8172.o
 obj-$(CONFIG_BLK_DEV_IT8213)            += it8213.o
 obj-$(CONFIG_BLK_DEV_IT821X)            += it821x.o
 obj-$(CONFIG_BLK_DEV_JMICRON)           += jmicron.o
diff --git a/drivers/ide/it8172.c b/drivers/ide/it8172.c
new file mode 100644
index 000000000000..e021078cd06b
--- /dev/null
+++ b/drivers/ide/it8172.c
@@ -0,0 +1,166 @@
+/*
+ *
+ * BRIEF MODULE DESCRIPTION
+ *      IT8172 IDE controller support
+ *
+ * Copyright (C) 2000 MontaVista Software Inc.
+ * Copyright (C) 2008 Shane McDonald
+ *
+ *  This program is free software; you can redistribute  it and/or modify it
+ *  under  the terms of  the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ *
+ *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
+ *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
+ *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
+ *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
+ *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *  You should have received a copy of the  GNU General Public License along
+ *  with this program; if not, write  to the Free Software Foundation, Inc.,
+ *  675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/ioport.h>
+#include <linux/pci.h>
+#include <linux/ide.h>
+#include <linux/init.h>
+
+#define DRV_NAME "IT8172"
+
+static void it8172_set_pio_mode(ide_drive_t *drive, const u8 pio)
+{
+        ide_hwif_t *hwif        = drive->hwif;
+        struct pci_dev *dev     = to_pci_dev(hwif->dev);
+        u16 drive_enables;
+        u32 drive_timing;
+
+        /*
+         * The highest value of DIOR/DIOW pulse width and recovery time
+         * that can be set in the IT8172 is 8 PCI clock cycles.  As a result,
+         * it cannot be configured for PIO mode 0.  This table sets these
+         * parameters to the maximum supported by the IT8172.
+         */
+        static const u8 timings[] = { 0x3f, 0x3c, 0x1b, 0x12, 0x0a };
+
+        pci_read_config_word(dev, 0x40, &drive_enables);
+        pci_read_config_dword(dev, 0x44, &drive_timing);
+
+        /*
+         * Enable port 0x44. The IT8172 spec is confused; it calls
+         * this register the "Slave IDE Timing Register", but in fact,
+         * it controls timing for both master and slave drives.
+         */
+        drive_enables |= 0x4000;
+
+        drive_enables &= drive->dn ? 0xc006 : 0xc060;
+        if (drive->media == ide_disk)
+                /* enable prefetch */
+                drive_enables |= 0x0004 << (drive->dn * 4);
+        if (ata_id_has_iordy(drive->id))
+                /* enable IORDY sample-point */
+                drive_enables |= 0x0002 << (drive->dn * 4);
+
+        drive_timing &= drive->dn ? 0x00003f00 : 0x000fc000;
+        drive_timing |= timings[pio] << (drive->dn * 6 + 8);
+
+        pci_write_config_word(dev, 0x40, drive_enables);
+        pci_write_config_dword(dev, 0x44, drive_timing);
+}
+
+static void it8172_set_dma_mode(ide_drive_t *drive, const u8 speed)
+{
+        ide_hwif_t *hwif        = drive->hwif;
+        struct pci_dev *dev     = to_pci_dev(hwif->dev);
+        int a_speed             = 3 << (drive->dn * 4);
+        int u_flag              = 1 << drive->dn;
+        int u_speed             = 0;
+        u8 reg48, reg4a;
+
+        pci_read_config_byte(dev, 0x48, &reg48);
+        pci_read_config_byte(dev, 0x4a, &reg4a);
+
+        if (speed >= XFER_UDMA_0) {
+                u8 udma = speed - XFER_UDMA_0;
+                u_speed = udma << (drive->dn * 4);
+
+                pci_write_config_byte(dev, 0x48, reg48 | u_flag);
+                reg4a &= ~a_speed;
+                pci_write_config_byte(dev, 0x4a, reg4a | u_speed);
+        } else {
+                const u8 mwdma_to_pio[] = { 0, 3, 4 };
+                u8 pio;
+
+                pci_write_config_byte(dev, 0x48, reg48 & ~u_flag);
+                pci_write_config_byte(dev, 0x4a, reg4a & ~a_speed);
+
+                pio = mwdma_to_pio[speed - XFER_MW_DMA_0];
+
+                it8172_set_pio_mode(drive, pio);
+        }
+}
+
+
+static const struct ide_port_ops it8172_port_ops = {
+        .set_pio_mode   = it8172_set_pio_mode,
+        .set_dma_mode   = it8172_set_dma_mode,
+};
+
+static const struct ide_port_info it8172_port_info __devinitdata = {
+        .name           = DRV_NAME,
+        .port_ops       = &it8172_port_ops,
+        .enablebits     = { {0x41, 0x80, 0x80}, {0x00, 0x00, 0x00} },
+        .host_flags     = IDE_HFLAG_SINGLE,
+        .pio_mask       = ATA_PIO4 & ~ATA_PIO0,
+        .mwdma_mask     = ATA_MWDMA2,
+        .udma_mask      = ATA_UDMA2,
+};
+
+static int __devinit it8172_init_one(struct pci_dev *dev,
+                                        const struct pci_device_id *id)
+{
+        if ((dev->class >> 8) != PCI_CLASS_STORAGE_IDE)
+                return -ENODEV; /* IT8172 is more than an IDE controller */
+        return ide_pci_init_one(dev, &it8172_port_info, NULL);
+}
+
+static struct pci_device_id it8172_pci_tbl[] = {
+        { PCI_VDEVICE(ITE, PCI_DEVICE_ID_ITE_8172), 0 },
+        { 0, },
+};
+MODULE_DEVICE_TABLE(pci, it8172_pci_tbl);
+
+static struct pci_driver it8172_pci_driver = {
+        .name           = "IT8172_IDE",
+        .id_table       = it8172_pci_tbl,
+        .probe          = it8172_init_one,
+        .remove         = ide_pci_remove,
+        .suspend        = ide_pci_suspend,
+        .resume         = ide_pci_resume,
+};
+
+static int __init it8172_ide_init(void)
+{
+        return ide_pci_register_driver(&it8172_pci_driver);
+}
+
+static void __exit it8172_ide_exit(void)
+{
+        pci_unregister_driver(&it8172_pci_driver);
+}
+
+module_init(it8172_ide_init);
+module_exit(it8172_ide_exit);
+
+MODULE_AUTHOR("Steve Longerbeam");
+MODULE_DESCRIPTION("PCI driver module for ITE 8172 IDE");
+MODULE_LICENSE("GPL");