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155 lines
3.8 KiB
155 lines
3.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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/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: [email protected] (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 <[email protected]> |
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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_hwif_t *hwif, ide_drive_t *drive) |
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{ |
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unsigned long flags; |
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if (drive->pio_mode >= XFER_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 __initconst = { |
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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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IDE_HFLAG_DTC2278, |
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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 bool 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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