110 lines
2.5 KiB
C
110 lines
2.5 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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* ktti.c is a low-level protocol driver for the KT Technology
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* parallel port adapter. This adapter is used in the "PHd"
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* 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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#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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static int cont_map[2] = { 0x10, 0x08 };
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static void ktti_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
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{
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int r = regr + cont_map[cont];
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w0(r); w2(0xb); w2(0xa); w2(3); w2(6);
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w0(val); w2(3); w0(0); w2(6); w2(0xb);
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}
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static int ktti_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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r = regr + cont_map[cont];
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w0(r); w2(0xb); w2(0xa); w2(9); w2(0xc); w2(9);
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a = r1(); w2(0xc); b = r1(); w2(9); w2(0xc); w2(9);
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return j44(a, b);
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}
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static void ktti_read_block(struct pi_adapter *pi, char *buf, int count)
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{
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int k, a, b;
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for (k = 0; k < count / 2; k++) {
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w0(0x10); w2(0xb); w2(0xa); w2(9); w2(0xc); w2(9);
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a = r1(); w2(0xc); b = r1(); w2(9);
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buf[2*k] = j44(a, b);
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a = r1(); w2(0xc); b = r1(); w2(9);
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buf[2*k+1] = j44(a, b);
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}
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}
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static void ktti_write_block(struct pi_adapter *pi, char *buf, int count)
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{
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int k;
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for (k = 0; k < count / 2; k++) {
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w0(0x10); w2(0xb); w2(0xa); w2(3); w2(6);
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w0(buf[2 * k]); w2(3);
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w0(buf[2 * k + 1]); w2(6);
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w2(0xb);
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}
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}
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static void ktti_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(0xb); w2(0xa); w0(0); w2(3); w2(6);
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}
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static void ktti_disconnect(struct pi_adapter *pi)
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{
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w2(0xb); w2(0xa); w0(0xa0); w2(3); w2(4);
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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 ktti_log_adapter(struct pi_adapter *pi)
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{
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dev_info(&pi->dev, "KT 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 ktti = {
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.owner = THIS_MODULE,
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.name = "ktti",
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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 = ktti_write_regr,
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.read_regr = ktti_read_regr,
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.write_block = ktti_write_block,
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.read_block = ktti_read_block,
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.connect = ktti_connect,
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.disconnect = ktti_disconnect,
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.log_adapter = ktti_log_adapter,
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};
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MODULE_LICENSE("GPL");
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module_pata_parport_driver(ktti);
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