265 lines
5.5 KiB
C
265 lines
5.5 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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* friq.c is a low-level protocol driver for the Freecom "IQ"
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* parallel port IDE adapter. Early versions of this adapter
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* use the 'frpw' protocol.
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*
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* Freecom uses this adapter in a battery powered external
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* CD-ROM drive. It is also used in LS-120 drives by
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* Maxell and Panasonic, and other devices.
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*
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* The battery powered drive requires software support to
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* control the power to the drive. This module enables the
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* drive power when the high level driver (pcd) is loaded
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* and disables it when the module is unloaded. Note, if
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* the friq module is built in to the kernel, the power
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* will never be switched off, so other means should be
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* used to conserve battery power.
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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 CMD(x) \
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do { \
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w2(4); w0(0xff); w0(0xff); w0(0x73); w0(0x73); \
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w0(0xc9); w0(0xc9); w0(0x26); \
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w0(0x26); w0(x); w0(x); \
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} while (0)
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#define j44(l, h) (((l >> 4) & 0x0f) | (h & 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] = { 0x08, 0x10 };
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static int friq_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 + cont_map[cont];
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CMD(r);
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w2(6); l = r1();
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w2(4); h = r1();
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w2(4);
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return j44(l, h);
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}
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static void friq_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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CMD(r);
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w0(val);
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w2(5); w2(7); w2(5); w2(4);
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}
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static void friq_read_block_int(struct pi_adapter *pi, char *buf, int count, int regr)
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{
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int h, l, k, ph;
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switch (pi->mode) {
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case 0:
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CMD(regr);
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for (k = 0; k < count; k++) {
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w2(6); l = r1();
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w2(4); h = r1();
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buf[k] = j44(l, h);
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}
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w2(4);
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break;
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case 1:
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ph = 2;
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CMD(regr + 0xc0);
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w0(0xff);
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for (k = 0; k < count; k++) {
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w2(0xa4 + ph);
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buf[k] = r0();
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ph = 2 - ph;
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}
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w2(0xac); w2(0xa4); w2(4);
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break;
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case 2:
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CMD(regr + 0x80);
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for (k = 0; k < count - 2; k++)
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buf[k] = r4();
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w2(0xac); w2(0xa4);
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buf[count - 2] = r4();
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buf[count - 1] = r4();
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w2(4);
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break;
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case 3:
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CMD(regr + 0x80);
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for (k = 0; k < count / 2 - 1; k++)
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((u16 *)buf)[k] = r4w();
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w2(0xac); w2(0xa4);
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buf[count - 2] = r4();
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buf[count - 1] = r4();
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w2(4);
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break;
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case 4:
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CMD(regr + 0x80);
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for (k = 0; k < count / 4 - 1; k++)
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((u32 *)buf)[k] = r4l();
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buf[count - 4] = r4();
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buf[count - 3] = r4();
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w2(0xac); w2(0xa4);
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buf[count - 2] = r4();
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buf[count - 1] = r4();
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w2(4);
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break;
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}
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}
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static void friq_read_block(struct pi_adapter *pi, char *buf, int count)
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{
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friq_read_block_int(pi, buf, count, 0x08);
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}
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static void friq_write_block(struct pi_adapter *pi, char *buf, int count)
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{
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int k;
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switch (pi->mode) {
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case 0:
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case 1:
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CMD(8); w2(5);
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for (k = 0; k < count; k++) {
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w0(buf[k]);
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w2(7); w2(5);
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}
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w2(4);
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break;
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case 2:
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CMD(0xc8); w2(5);
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for (k = 0; k < count; k++)
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w4(buf[k]);
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w2(4);
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break;
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case 3:
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CMD(0xc8); w2(5);
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for (k = 0; k < count / 2; k++)
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w4w(((u16 *)buf)[k]);
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w2(4);
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break;
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case 4:
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CMD(0xc8); w2(5);
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for (k = 0; k < count / 4; k++)
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w4l(((u32 *)buf)[k]);
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w2(4);
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break;
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}
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}
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static void friq_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);
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}
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static void friq_disconnect(struct pi_adapter *pi)
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{
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CMD(0x20);
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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 int friq_test_proto(struct pi_adapter *pi)
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{
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int j, k, r;
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int e[2] = { 0, 0 };
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char scratch[512];
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pi->saved_r0 = r0();
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w0(0xff); udelay(20); CMD(0x3d); /* turn the power on */
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udelay(500);
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w0(pi->saved_r0);
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friq_connect(pi);
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for (j = 0; j < 2; j++) {
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friq_write_regr(pi, 0, 6, 0xa0 + j * 0x10);
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for (k = 0; k < 256; k++) {
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friq_write_regr(pi, 0, 2, k ^ 0xaa);
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friq_write_regr(pi, 0, 3, k ^ 0x55);
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if (friq_read_regr(pi, 0, 2) != (k ^ 0xaa))
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e[j]++;
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}
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}
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friq_disconnect(pi);
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friq_connect(pi);
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friq_read_block_int(pi, scratch, 512, 0x10);
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r = 0;
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for (k = 0; k < 128; k++) {
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if (scratch[k] != k)
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r++;
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}
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friq_disconnect(pi);
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dev_dbg(&pi->dev,
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"friq: port 0x%x, mode %d, test=(%d,%d,%d)\n",
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pi->port, pi->mode, e[0], e[1], r);
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return r || (e[0] && e[1]);
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}
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static void friq_log_adapter(struct pi_adapter *pi)
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{
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char *mode_string[6] = { "4-bit", "8-bit", "EPP-8", "EPP-16", "EPP-32"};
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dev_info(&pi->dev,
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"Freecom IQ ASIC-2 adapter 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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pi->private = 1;
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friq_connect(pi);
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CMD(0x9e); /* disable sleep timer */
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friq_disconnect(pi);
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}
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static void friq_release_proto(struct pi_adapter *pi)
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{
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if (pi->private) { /* turn off the power */
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friq_connect(pi);
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CMD(0x1d); CMD(0x1e);
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friq_disconnect(pi);
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pi->private = 0;
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}
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}
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static struct pi_protocol friq = {
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.owner = THIS_MODULE,
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.name = "friq",
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.max_mode = 5,
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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 = friq_write_regr,
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.read_regr = friq_read_regr,
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.write_block = friq_write_block,
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.read_block = friq_read_block,
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.connect = friq_connect,
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.disconnect = friq_disconnect,
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.test_proto = friq_test_proto,
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.log_adapter = friq_log_adapter,
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.release_proto = friq_release_proto,
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};
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>");
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MODULE_DESCRIPTION("Freecom IQ parallel port IDE adapter protocol driver");
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module_pata_parport_driver(friq);
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