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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/ide/legacy/dtc2278.c
downloadop-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip
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Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/ide/legacy/dtc2278.c')
-rw-r--r--drivers/ide/legacy/dtc2278.c165
1 files changed, 165 insertions, 0 deletions
diff --git a/drivers/ide/legacy/dtc2278.c b/drivers/ide/legacy/dtc2278.c
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+++ b/drivers/ide/legacy/dtc2278.c
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+/*
+ * 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");
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