136 lines
2.9 KiB
C
136 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* (c) 1998 Grant R. Guenther <grant@torque.net>
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*
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* fit2.c is a low-level protocol driver for the older version
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* of the Fidelity International Technology parallel port adapter.
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* This adapter is used in their TransDisk 2000 and older TransDisk
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* 3000 portable hard-drives. As far as I can tell, this device
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* supports 4-bit mode _only_.
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*
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* Newer models of the FIT products use an enhanced protocol.
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* The "fit3" protocol module should support current drives.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/wait.h>
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#include <asm/io.h>
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#include "pata_parport.h"
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#define j44(a, b) (((a >> 4) & 0x0f) | (b & 0xf0))
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/*
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* cont = 0 - access the IDE register file
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* cont = 1 - access the IDE command set
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*
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* NB: The FIT adapter does not appear to use the control registers.
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* So, we map ALT_STATUS to STATUS and NO-OP writes to the device
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* control register - this means that IDE reset will not work on these
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* devices.
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*/
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static void fit2_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
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{
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if (cont == 1)
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return;
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w2(0xc); w0(regr); w2(4); w0(val); w2(5); w0(0); w2(4);
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}
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static int fit2_read_regr(struct pi_adapter *pi, int cont, int regr)
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{
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int a, b, r;
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if (cont) {
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if (regr != 6)
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return 0xff;
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r = 7;
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} else {
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r = regr + 0x10;
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}
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w2(0xc); w0(r); w2(4); w2(5);
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w0(0); a = r1();
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w0(1); b = r1();
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w2(4);
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return j44(a, b);
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}
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static void fit2_read_block(struct pi_adapter *pi, char *buf, int count)
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{
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int k, a, b, c, d;
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w2(0xc); w0(0x10);
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for (k = 0; k < count / 4; k++) {
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w2(4); w2(5);
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w0(0); a = r1(); w0(1); b = r1();
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w0(3); c = r1(); w0(2); d = r1();
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buf[4 * k + 0] = j44(a, b);
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buf[4 * k + 1] = j44(d, c);
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w2(4); w2(5);
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a = r1(); w0(3); b = r1();
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w0(1); c = r1(); w0(0); d = r1();
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buf[4 * k + 2] = j44(d, c);
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buf[4 * k + 3] = j44(a, b);
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}
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w2(4);
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}
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static void fit2_write_block(struct pi_adapter *pi, char *buf, int count)
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{
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int k;
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w2(0xc); w0(0);
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for (k = 0; k < count / 2; k++) {
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w2(4); w0(buf[2 * k]);
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w2(5); w0(buf[2 * k + 1]);
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}
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w2(4);
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}
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static void fit2_connect(struct pi_adapter *pi)
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{
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pi->saved_r0 = r0();
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pi->saved_r2 = r2();
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w2(0xcc);
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}
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static void fit2_disconnect(struct pi_adapter *pi)
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{
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w0(pi->saved_r0);
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w2(pi->saved_r2);
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}
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static void fit2_log_adapter(struct pi_adapter *pi)
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{
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dev_info(&pi->dev, "FIT 2000 adapter at 0x%x, delay %d\n",
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pi->port, pi->delay);
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}
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static struct pi_protocol fit2 = {
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.owner = THIS_MODULE,
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.name = "fit2",
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.max_mode = 1,
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.epp_first = 2,
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.default_delay = 1,
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.max_units = 1,
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.write_regr = fit2_write_regr,
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.read_regr = fit2_read_regr,
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.write_block = fit2_write_block,
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.read_block = fit2_read_block,
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.connect = fit2_connect,
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.disconnect = fit2_disconnect,
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.log_adapter = fit2_log_adapter,
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};
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MODULE_LICENSE("GPL");
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module_pata_parport_driver(fit2);
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