linux/drivers/ide/dtc2278.c

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 1996 Linus Torvalds & author (see below)
*/
#include <linux/module.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/ide.h>
#include <linux/init.h>
#include <asm/io.h>
#define DRV_NAME "dtc2278"
/*
* 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 DEFINE_SPINLOCK(dtc2278_lock);
static void dtc2278_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
{
unsigned long flags;
if (drive->pio_mode >= XFER_PIO_3) {
spin_lock_irqsave(&dtc2278_lock, flags);
/*
* This enables PIO mode4 (3?) on the first interface
*/
sub22(1,0xc3);
sub22(0,0xa0);
spin_unlock_irqrestore(&dtc2278_lock, flags);
} else {
/* we don't know how to set it back again.. */
/* Actually we do - there is a data sheet available for the
Winbond but does anyone actually care */
}
}
static const struct ide_port_ops dtc2278_port_ops = {
.set_pio_mode = dtc2278_set_pio_mode,
};
static const struct ide_port_info dtc2278_port_info __initconst = {
.name = DRV_NAME,
.chipset = ide_dtc2278,
.port_ops = &dtc2278_port_ops,
.host_flags = IDE_HFLAG_SERIALIZE |
IDE_HFLAG_NO_UNMASK_IRQS |
IDE_HFLAG_IO_32BIT |
/* disallow ->io_32bit changes */
IDE_HFLAG_NO_IO_32BIT |
IDE_HFLAG_NO_DMA |
IDE_HFLAG_DTC2278,
.pio_mask = ATA_PIO4,
};
static int __init dtc2278_probe(void)
{
unsigned long flags;
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);
return ide_legacy_device_add(&dtc2278_port_info, 0);
}
static bool probe_dtc2278;
module_param_named(probe, probe_dtc2278, bool, 0);
MODULE_PARM_DESC(probe, "probe for DTC2278xx chipsets");
ide: make remaining built-in only IDE host drivers modular (take 2) * Make remaining built-in only IDE host drivers modular, add ide-scan-pci.c file for probing PCI host drivers registered with IDE core (special case for built-in IDE and CONFIG_IDEPCI_PCIBUS_ORDER=y) and then take care of the ordering in which all IDE host drivers are probed when IDE is built-in during link time. * Move probing of gayle, falconide, macide, q40ide and buddha (m68k arch specific) host drivers, before PCI ones (no PCI on m68k), ide-cris (cris arch specific), cmd640 (x86 arch specific) and pmac (ppc arch specific). * Move probing of ide-cris (cris arch specific) host driver before cmd640 (x86 arch specific). * Move probing of mpc8xx (ppc specific) host driver before ide-pnp (depends on ISA and none of ppc platform that use mpc8xx supports ISA) and ide-h8300 (h8300 arch specific). * Add "probe_vlb" kernel parameter to cmd640 host driver and update Documentation/ide.txt accordingly. * Make IDE_ARM config option visible so it can also be disabled if needed. * Remove bogus comment from ide.c while at it. v2: * Fix two issues spotted by Sergei: - replace ENOMEM error value by ENOENT in ide-h8300 host driver - fix MODULE_PARM_DESC() in cmd640 host driver Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com> Cc: Mikael Starvik <starvik@axis.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Roman Zippel <zippel@linux-m68k.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
2008-01-26 19:13:07 +00:00
static int __init dtc2278_init(void)
{
if (probe_dtc2278 == 0)
return -ENODEV;
if (dtc2278_probe()) {
printk(KERN_ERR "dtc2278: ide interfaces already in use!\n");
return -EBUSY;
}
return 0;
}
module_init(dtc2278_init);
MODULE_AUTHOR("See Local File");
MODULE_DESCRIPTION("support of DTC-2278 VLB IDE chipsets");
MODULE_LICENSE("GPL");