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https://github.com/torvalds/linux
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154 lines
3.8 KiB
C
154 lines
3.8 KiB
C
/*
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* Copyright (C) 1996 Linus Torvalds & author (see below)
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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/delay.h>
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#include <linux/timer.h>
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#include <linux/mm.h>
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#include <linux/ioport.h>
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#include <linux/blkdev.h>
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#include <linux/hdreg.h>
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#include <linux/ide.h>
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#include <linux/init.h>
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#include <asm/io.h>
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#define DRV_NAME "dtc2278"
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/*
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* Changing this #undef to #define may solve start up problems in some systems.
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*/
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#undef ALWAYS_SET_DTC2278_PIO_MODE
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/*
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* From: andy@cercle.cts.com (Dyan Wile)
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*
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* Below is a patch for DTC-2278 - alike software-programmable controllers
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* The code enables the secondary IDE controller and the PIO4 (3?) timings on
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* the primary (EIDE). You may probably have to enable the 32-bit support to
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* get the full speed. You better get the disk interrupts disabled ( hdparm -u0
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* /dev/hd.. ) for the drives connected to the EIDE interface. (I get my
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* filesystem corrupted with -u1, but under heavy disk load only :-)
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*
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* This card is now forced to use the "serialize" feature,
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* and irq-unmasking is disallowed. If io_32bit is enabled,
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* it must be done for BOTH drives on each interface.
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*
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* This code was written for the DTC2278E, but might work with any of these:
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*
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* DTC2278S has only a single IDE interface.
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* DTC2278D has two IDE interfaces and is otherwise identical to the S version.
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* DTC2278E also has serial ports and a printer port
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* DTC2278EB: has onboard BIOS, and "works like a charm" -- Kent Bradford <kent@theory.caltech.edu>
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*
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* There may be a fourth controller type. The S and D versions use the
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* Winbond chip, and I think the E version does also.
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*
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*/
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static void sub22 (char b, char c)
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{
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int i;
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for(i = 0; i < 3; ++i) {
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inb(0x3f6);
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outb_p(b,0xb0);
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inb(0x3f6);
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outb_p(c,0xb4);
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inb(0x3f6);
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if(inb(0xb4) == c) {
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outb_p(7,0xb0);
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inb(0x3f6);
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return; /* success */
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}
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}
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}
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static DEFINE_SPINLOCK(dtc2278_lock);
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static void dtc2278_set_pio_mode(ide_drive_t *drive, const u8 pio)
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{
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unsigned long flags;
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if (pio >= 3) {
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spin_lock_irqsave(&dtc2278_lock, flags);
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/*
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* This enables PIO mode4 (3?) on the first interface
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*/
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sub22(1,0xc3);
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sub22(0,0xa0);
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spin_unlock_irqrestore(&dtc2278_lock, flags);
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} else {
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/* we don't know how to set it back again.. */
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/* Actually we do - there is a data sheet available for the
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Winbond but does anyone actually care */
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}
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}
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static const struct ide_port_ops dtc2278_port_ops = {
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.set_pio_mode = dtc2278_set_pio_mode,
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};
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static const struct ide_port_info dtc2278_port_info __initdata = {
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.name = DRV_NAME,
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.chipset = ide_dtc2278,
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.port_ops = &dtc2278_port_ops,
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.host_flags = IDE_HFLAG_SERIALIZE |
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IDE_HFLAG_NO_UNMASK_IRQS |
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IDE_HFLAG_IO_32BIT |
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/* disallow ->io_32bit changes */
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IDE_HFLAG_NO_IO_32BIT |
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IDE_HFLAG_NO_DMA,
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.pio_mask = ATA_PIO4,
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};
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static int __init dtc2278_probe(void)
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{
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unsigned long flags;
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local_irq_save(flags);
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/*
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* This enables the second interface
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*/
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outb_p(4,0xb0);
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inb(0x3f6);
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outb_p(0x20,0xb4);
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inb(0x3f6);
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#ifdef ALWAYS_SET_DTC2278_PIO_MODE
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/*
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* This enables PIO mode4 (3?) on the first interface
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* and may solve start-up problems for some people.
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*/
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sub22(1,0xc3);
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sub22(0,0xa0);
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#endif
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local_irq_restore(flags);
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return ide_legacy_device_add(&dtc2278_port_info, 0);
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}
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static int probe_dtc2278;
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module_param_named(probe, probe_dtc2278, bool, 0);
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MODULE_PARM_DESC(probe, "probe for DTC2278xx chipsets");
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static int __init dtc2278_init(void)
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{
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if (probe_dtc2278 == 0)
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return -ENODEV;
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if (dtc2278_probe()) {
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printk(KERN_ERR "dtc2278: ide interfaces already in use!\n");
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return -EBUSY;
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}
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return 0;
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}
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module_init(dtc2278_init);
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MODULE_AUTHOR("See Local File");
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MODULE_DESCRIPTION("support of DTC-2278 VLB IDE chipsets");
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MODULE_LICENSE("GPL");
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