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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * (c) 1997-8 Grant R. Guenther <grant@torque.net>4 *5 * aten.c is a low-level protocol driver for the ATEN EH-1006 * parallel port adapter. The EH-100 supports 4-bit and 8-bit7 * modes only. There is also an EH-132 which supports EPP mode8 * transfers. The EH-132 is not yet supported.9 */10 11#include <linux/module.h>12#include <linux/init.h>13#include <linux/delay.h>14#include <linux/kernel.h>15#include <linux/wait.h>16#include <linux/types.h>17#include <asm/io.h>18#include "pata_parport.h"19 20#define j44(a,b) ((((a>>4)&0x0f)|(b&0xf0))^0x88)21 22/*23 * cont = 0 - access the IDE register file24 * cont = 1 - access the IDE command set25 */26static int cont_map[2] = { 0x08, 0x20 };27 28static void aten_write_regr(struct pi_adapter *pi, int cont, int regr, int val)29{30 int r = regr + cont_map[cont] + 0x80;31 32 w0(r); w2(0xe); w2(6); w0(val); w2(7); w2(6); w2(0xc);33}34 35static int aten_read_regr(struct pi_adapter *pi, int cont, int regr)36{37 int a, b, r;38 39 r = regr + cont_map[cont] + 0x40;40 41 switch (pi->mode) {42 43 case 0:44 w0(r); w2(0xe); w2(6);45 w2(7); w2(6); w2(0);46 a = r1(); w0(0x10); b = r1(); w2(0xc);47 return j44(a,b);48 49 case 1:50 r |= 0x10;51 w0(r); w2(0xe); w2(6); w0(0xff);52 w2(0x27); w2(0x26); w2(0x20);53 a = r0();54 w2(0x26); w2(0xc);55 return a;56 }57 return -1;58}59 60static void aten_read_block(struct pi_adapter *pi, char *buf, int count)61{62 int k, a, b, c, d;63 64 switch (pi->mode) {65 66 case 0:67 w0(0x48); w2(0xe); w2(6);68 for (k = 0; k < count / 2; k++) {69 w2(7); w2(6); w2(2);70 a = r1(); w0(0x58); b = r1();71 w2(0); d = r1(); w0(0x48); c = r1();72 buf[2 * k] = j44(c, d);73 buf[2 * k + 1] = j44(a, b);74 }75 w2(0xc);76 break;77 78 case 1:79 w0(0x58); w2(0xe); w2(6);80 for (k = 0; k < count / 2; k++) {81 w2(0x27); w2(0x26); w2(0x22);82 a = r0(); w2(0x20); b = r0();83 buf[2 * k] = b;84 buf[2 * k + 1] = a;85 }86 w2(0x26); w2(0xc);87 break;88 }89}90 91static void aten_write_block(struct pi_adapter *pi, char *buf, int count)92{93 int k;94 95 w0(0x88); w2(0xe); w2(6);96 for (k = 0; k < count / 2; k++) {97 w0(buf[2 * k + 1]); w2(0xe); w2(6);98 w0(buf[2 * k]); w2(7); w2(6);99 }100 w2(0xc);101}102 103static void aten_connect(struct pi_adapter *pi)104{105 pi->saved_r0 = r0();106 pi->saved_r2 = r2();107 w2(0xc);108}109 110static void aten_disconnect(struct pi_adapter *pi)111{112 w0(pi->saved_r0);113 w2(pi->saved_r2);114}115 116static void aten_log_adapter(struct pi_adapter *pi)117{118 char *mode_string[2] = { "4-bit", "8-bit" };119 120 dev_info(&pi->dev,121 "ATEN EH-100 at 0x%x, mode %d (%s), delay %d\n",122 pi->port, pi->mode, mode_string[pi->mode], pi->delay);123}124 125static struct pi_protocol aten = {126 .owner = THIS_MODULE,127 .name = "aten",128 .max_mode = 2,129 .epp_first = 2,130 .default_delay = 1,131 .max_units = 1,132 .write_regr = aten_write_regr,133 .read_regr = aten_read_regr,134 .write_block = aten_write_block,135 .read_block = aten_read_block,136 .connect = aten_connect,137 .disconnect = aten_disconnect,138 .log_adapter = aten_log_adapter,139};140 141MODULE_LICENSE("GPL");142MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>");143MODULE_DESCRIPTION("ATEN EH-100 parallel port IDE adapter protocol driver");144module_pata_parport_driver(aten);145