146 lines
2.8 KiB
C
146 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* (c) 1996-1998 Grant R. Guenther <grant@torque.net>
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*
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* on20.c is a low-level protocol driver for the
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* Onspec 90c20 parallel to IDE adapter.
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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 op(f) \
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do { \
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w2(4); w0(f); w2(5); w2(0xd); \
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w2(5); w2(0xd); w2(5); w2(4); \
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} while (0)
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#define vl(v) \
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do { \
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w2(4); w0(v); w2(5); \
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w2(7); w2(5); w2(4); \
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} while (0)
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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 on20_read_regr(struct pi_adapter *pi, int cont, int regr)
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{
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int h, l, r;
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r = (regr << 2) + 1 + cont;
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op(1); vl(r); op(0);
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switch (pi->mode) {
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case 0:
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w2(4); w2(6); l = r1();
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w2(4); w2(6); h = r1();
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w2(4); w2(6); w2(4); w2(6); w2(4);
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return j44(l, h);
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case 1:
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w2(4); w2(0x26); r = r0();
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w2(4); w2(0x26); w2(4);
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return r;
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}
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return -1;
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}
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static void on20_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
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{
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int r = (regr << 2) + 1 + cont;
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op(1); vl(r);
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op(0); vl(val);
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op(0); vl(val);
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}
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static void on20_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(4); w0(0); w2(0xc); w2(4); w2(6); w2(4); w2(6); w2(4);
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if (pi->mode) {
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op(2); vl(8); op(2); vl(9);
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} else {
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op(2); vl(0); op(2); vl(8);
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}
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}
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static void on20_disconnect(struct pi_adapter *pi)
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{
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w2(4); w0(7); w2(4); w2(0xc); 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 on20_read_block(struct pi_adapter *pi, char *buf, int count)
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{
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int k, l, h;
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op(1); vl(1); op(0);
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for (k = 0; k < count; k++) {
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if (pi->mode) {
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w2(4); w2(0x26); buf[k] = r0();
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} else {
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w2(6); l = r1(); w2(4);
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w2(6); h = r1(); w2(4);
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buf[k] = j44(l, h);
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}
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}
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w2(4);
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}
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static void on20_write_block(struct pi_adapter *pi, char *buf, int count)
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{
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int k;
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op(1); vl(1); op(0);
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for (k = 0; k < count; k++) {
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w2(5); w0(buf[k]); w2(7);
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}
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w2(4);
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}
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static void on20_log_adapter(struct pi_adapter *pi)
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{
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char *mode_string[2] = { "4-bit", "8-bit" };
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dev_info(&pi->dev,
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"OnSpec 90c20 at 0x%x, mode %d (%s), delay %d\n",
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pi->port, pi->mode, mode_string[pi->mode], pi->delay);
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}
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static struct pi_protocol on20 = {
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.owner = THIS_MODULE,
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.name = "on20",
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.max_mode = 2,
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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 = on20_write_regr,
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.read_regr = on20_read_regr,
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.write_block = on20_write_block,
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.read_block = on20_read_block,
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.connect = on20_connect,
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.disconnect = on20_disconnect,
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.log_adapter = on20_log_adapter,
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};
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MODULE_LICENSE("GPL");
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module_pata_parport_driver(on20);
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