linux/drivers/ata/libata-pata-timings.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Helper library for PATA timings
 *
 *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
 *  Copyright 2003-2004 Jeff Garzik
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/libata.h>

/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
 * for UDMA6, which is currently supported only by Maxtor drives.
 *
 * For PIO 5/6 MWDMA 3/4 see the CFA specification 3.0.
 */

static const struct ata_timing ata_timing[] = …;

#define ENOUGH(v, unit) …
#define EZ(v, unit) …

static void ata_timing_quantize(const struct ata_timing *t,
				struct ata_timing *q, int T, int UT)
{ … }

void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
		      struct ata_timing *m, unsigned int what)
{ … }
EXPORT_SYMBOL_GPL(…);

const struct ata_timing *ata_timing_find_mode(u8 xfer_mode)
{ … }
EXPORT_SYMBOL_GPL(…);

int ata_timing_compute(struct ata_device *adev, unsigned short speed,
		       struct ata_timing *t, int T, int UT)
{ … }
EXPORT_SYMBOL_GPL(…);