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drivers/ide/dtc2278.c
3.84 KB
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// 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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#include <linux/module.h> |
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#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> |
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#include <linux/ide.h> #include <linux/init.h> #include <asm/io.h> |
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#define DRV_NAME "dtc2278" |
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/* * 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 */ } } } |
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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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{ 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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/* * This enables PIO mode4 (3?) on the first interface */ sub22(1,0xc3); sub22(0,0xa0); |
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spin_unlock_irqrestore(&dtc2278_lock, flags); |
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} else { /* 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 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 = { .set_pio_mode = dtc2278_set_pio_mode, }; |
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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 */ IDE_HFLAG_NO_IO_32BIT | |
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IDE_HFLAG_NO_DMA | IDE_HFLAG_DTC2278, |
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.pio_mask = ATA_PIO4, }; |
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static int __init dtc2278_probe(void) |
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{ unsigned long flags; |
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|
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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); |
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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); 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) return -ENODEV; if (dtc2278_probe()) { |
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printk(KERN_ERR "dtc2278: ide interfaces already in use! "); return -EBUSY; } return 0; } |
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module_init(dtc2278_init); |
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MODULE_AUTHOR("See Local File"); MODULE_DESCRIPTION("support of DTC-2278 VLB IDE chipsets"); MODULE_LICENSE("GPL"); |