1 files changed, 165 insertions, 0 deletions

diff --git a/drivers/ide/legacy/dtc2278.c b/drivers/ide/legacy/dtc2278.c
new file mode 100644
index 000000000000..20eb5b872ca9
--- /dev/null
+++ b/drivers/ide/legacy/dtc2278.c
@@ -0,0 +1,165 @@
+/*
+ *  linux/drivers/ide/legacy/dtc2278.c          Version 0.02    Feb 10, 1996
+ *
+ *  Copyright (C) 1996  Linus Torvalds & author (see below)
+ */
+
+#undef REALLY_SLOW_IO           /* most systems can safely undef this */
+
+#include <linux/module.h>
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/timer.h>
+#include <linux/mm.h>
+#include <linux/ioport.h>
+#include <linux/blkdev.h>
+#include <linux/hdreg.h>
+#include <linux/ide.h>
+#include <linux/init.h>
+
+#include <asm/io.h>
+
+/*
+ * Changing this #undef to #define may solve start up problems in some systems.
+ */
+#undef ALWAYS_SET_DTC2278_PIO_MODE
+
+/*
+ * From: andy@cercle.cts.com (Dyan Wile)
+ *
+ * Below is a patch for DTC-2278 - alike software-programmable controllers
+ * The code enables the secondary IDE controller and the PIO4 (3?) timings on
+ * the primary (EIDE). You may probably have to enable the 32-bit support to
+ * get the full speed. You better get the disk interrupts disabled ( hdparm -u0
+ * /dev/hd.. ) for the drives connected to the EIDE interface. (I get my
+ * filesystem  corrupted with -u1, but under heavy disk load only :-)
+ *
+ * This card is now forced to use the "serialize" feature,
+ * and irq-unmasking is disallowed.  If io_32bit is enabled,
+ * it must be done for BOTH drives on each interface.
+ *
+ * This code was written for the DTC2278E, but might work with any of these:
+ *
+ * DTC2278S has only a single IDE interface.
+ * DTC2278D has two IDE interfaces and is otherwise identical to the S version.
+ * DTC2278E also has serial ports and a printer port
+ * DTC2278EB: has onboard BIOS, and "works like a charm" -- Kent Bradford <kent@theory.caltech.edu>
+ *
+ * There may be a fourth controller type. The S and D versions use the
+ * Winbond chip, and I think the E version does also.
+ *
+ */
+
+static void sub22 (char b, char c)
+{
+        int i;
+
+        for(i = 0; i < 3; ++i) {
+                inb(0x3f6);
+                outb_p(b,0xb0);
+                inb(0x3f6);
+                outb_p(c,0xb4);
+                inb(0x3f6);
+                if(inb(0xb4) == c) {
+                        outb_p(7,0xb0);
+                        inb(0x3f6);
+                        return; /* success */
+                }
+        }
+}
+
+static void tune_dtc2278 (ide_drive_t *drive, u8 pio)
+{
+        unsigned long flags;
+
+        pio = ide_get_best_pio_mode(drive, pio, 4, NULL);
+
+        if (pio >= 3) {
+                spin_lock_irqsave(&ide_lock, flags);
+                /*
+                 * This enables PIO mode4 (3?) on the first interface
+                 */
+                sub22(1,0xc3);
+                sub22(0,0xa0);
+                spin_unlock_irqrestore(&ide_lock, flags);
+        } else {
+                /* we don't know how to set it back again.. */
+        }
+
+        /*
+         * 32bit I/O has to be enabled for *both* drives at the same time.
+         */
+        drive->io_32bit = 1;
+        HWIF(drive)->drives[!drive->select.b.unit].io_32bit = 1;
+}
+
+static int __init probe_dtc2278(void)
+{
+        unsigned long flags;
+        ide_hwif_t *hwif, *mate;
+
+        hwif = &ide_hwifs[0];
+        mate = &ide_hwifs[1];
+
+        if (hwif->chipset != ide_unknown || mate->chipset != ide_unknown)
+                return 1;
+
+        local_irq_save(flags);
+        /*
+         * This enables the second interface
+         */
+        outb_p(4,0xb0);
+        inb(0x3f6);
+        outb_p(0x20,0xb4);
+        inb(0x3f6);
+#ifdef ALWAYS_SET_DTC2278_PIO_MODE
+        /*
+         * This enables PIO mode4 (3?) on the first interface
+         * and may solve start-up problems for some people.
+         */
+        sub22(1,0xc3);
+        sub22(0,0xa0);
+#endif
+        local_irq_restore(flags);
+
+        hwif->serialized = 1;
+        hwif->chipset = ide_dtc2278;
+        hwif->tuneproc = &tune_dtc2278;
+        hwif->drives[0].no_unmask = 1;
+        hwif->drives[1].no_unmask = 1;
+        hwif->mate = mate;
+
+        mate->serialized = 1;
+        mate->chipset = ide_dtc2278;
+        mate->drives[0].no_unmask = 1;
+        mate->drives[1].no_unmask = 1;
+        mate->mate = hwif;
+        mate->channel = 1;
+
+        probe_hwif_init(hwif);
+        probe_hwif_init(mate);
+
+        create_proc_ide_interfaces();
+
+        return 0;
+}
+
+/* Can be called directly from ide.c. */
+int __init dtc2278_init(void)
+{
+        if (probe_dtc2278()) {
+                printk(KERN_ERR "dtc2278: ide interfaces already in use!\n");
+                return -EBUSY;
+        }
+        return 0;
+}
+
+#ifdef MODULE
+module_init(dtc2278_init);
+#endif
+
+MODULE_AUTHOR("See Local File");
+MODULE_DESCRIPTION("support of DTC-2278 VLB IDE chipsets");
+MODULE_LICENSE("GPL");