drivers/ata/pata_parport/fit3.c

Source file repositories/reference/linux-study-clean/drivers/ata/pata_parport/fit3.c

File Facts

System
Linux kernel
Corpus path
drivers/ata/pata_parport/fit3.c
Extension
.c
Size
3990 bytes
Lines
190
Domain
Driver Families
Bucket
drivers/ata
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * (c) 1998  Grant R. Guenther <grant@torque.net>
 *
 * fit3.c is a low-level protocol driver for newer models
 * of the Fidelity International Technology parallel port adapter.
 * This adapter is used in their TransDisk 3000 portable
 * hard-drives, as well as CD-ROM, PD-CD and other devices.
 *
 * The TD-2000 and certain older devices use a different protocol.
 * Try the fit2 protocol module with them.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/wait.h>
#include <asm/io.h>
#include "pata_parport.h"

#define j44(a, b)	(((a >> 3) & 0x0f) | ((b << 1) & 0xf0))

#define w7(byte)	out_p(7, byte)
#define r7()		(in_p(7) & 0xff)

/*
 * cont = 0 - access the IDE register file
 * cont = 1 - access the IDE command set
 */

static void fit3_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
{
	regr += cont << 3;

	switch (pi->mode) {
	case 0:
	case 1:
		w2(0xc); w0(regr); w2(0x8); w2(0xc);
		w0(val); w2(0xd);
		w0(0);   w2(0xc);
		break;
	case 2:
		w2(0xc); w0(regr); w2(0x8); w2(0xc);
		w4(val); w4(0);
		w2(0xc);
		break;
	}
}

static int fit3_read_regr(struct pi_adapter *pi, int cont, int regr)
{
	int  a, b;

	regr += cont << 3;

	switch (pi->mode) {
	case 0:
		w2(0xc); w0(regr + 0x10); w2(0x8); w2(0xc);
		w2(0xd); a = r1();
		w2(0xf); b = r1();
		w2(0xc);
		return j44(a, b);
	case 1:
		w2(0xc); w0(regr + 0x90); w2(0x8); w2(0xc);
		w2(0xec); w2(0xee); w2(0xef); a = r0();
		w2(0xc);
		return a;
	case 2:
		w2(0xc); w0(regr + 0x90); w2(0x8); w2(0xc);
		w2(0xec);
		a = r4(); b = r4();
		w2(0xc);
		return a;
	}

	return -1;
}

static void fit3_read_block(struct pi_adapter *pi, char *buf, int count)
{
	int  k, a, b, c, d;

	switch (pi->mode) {
	case 0:
		w2(0xc); w0(0x10); w2(0x8); w2(0xc);
		for (k = 0; k < count / 2; k++) {
			w2(0xd); a = r1();
			w2(0xf); b = r1();

Annotation

Implementation Notes