1258945Sroberto// SPDX-License-Identifier: GPL-2.0-or-later 2258945Sroberto/* 3258945Sroberto * (c) 1997-1998 Grant R. Guenther <grant@torque.net> 4258945Sroberto * 5258945Sroberto * comm.c is a low-level protocol driver for some older models of the DataStor 6258945Sroberto * "Commuter" parallel to IDE adapter. Some of the parallel port devices 7258945Sroberto * marketed by Arista currently use this adapter. 8258945Sroberto */ 9258945Sroberto 10258945Sroberto#include <linux/module.h> 11258945Sroberto#include <linux/init.h> 12258945Sroberto#include <linux/delay.h> 13258945Sroberto#include <linux/kernel.h> 14258945Sroberto#include <linux/types.h> 15258945Sroberto#include <linux/wait.h> 16258945Sroberto#include <asm/io.h> 17258945Sroberto#include "pata_parport.h" 18258945Sroberto 19258945Sroberto/* 20258945Sroberto * mode codes: 0 nybble reads, 8-bit writes 21258945Sroberto * 1 8-bit reads and writes 22258945Sroberto * 2 8-bit EPP mode 23258945Sroberto */ 24258945Sroberto 25258945Sroberto#define j44(a, b) (((a >> 3) & 0x0f) | ((b << 1) & 0xf0)) 26258945Sroberto 27258945Sroberto#define P1 w2(5);w2(0xd);w2(0xd);w2(5);w2(4); 28258945Sroberto#define P2 w2(5);w2(7);w2(7);w2(5);w2(4); 29258945Sroberto 30258945Sroberto/* 31258945Sroberto * cont = 0 - access the IDE register file 32258945Sroberto * cont = 1 - access the IDE command set 33258945Sroberto */ 34258945Srobertostatic int cont_map[2] = { 0x08, 0x10 }; 35258945Sroberto 36258945Srobertostatic int comm_read_regr(struct pi_adapter *pi, int cont, int regr) 37258945Sroberto{ 38258945Sroberto int l, h, r; 39258945Sroberto 40258945Sroberto r = regr + cont_map[cont]; 41258945Sroberto 42258945Sroberto switch (pi->mode) { 43258945Sroberto case 0: 44258945Sroberto w0(r); P1; w0(0); 45258945Sroberto w2(6); l = r1(); w0(0x80); h = r1(); w2(4); 46258945Sroberto return j44(l, h); 47258945Sroberto 48258945Sroberto case 1: 49258945Sroberto w0(r+0x20); P1; 50258945Sroberto w0(0); w2(0x26); h = r0(); w2(4); 51258945Sroberto return h; 52258945Sroberto 53258945Sroberto case 2: 54258945Sroberto case 3: 55258945Sroberto case 4: 56258945Sroberto w3(r+0x20); (void)r1(); 57258945Sroberto w2(0x24); h = r4(); w2(4); 58258945Sroberto return h; 59258945Sroberto } 60258945Sroberto 61258945Sroberto return -1; 62258945Sroberto} 63258945Sroberto 64258945Srobertostatic void comm_write_regr(struct pi_adapter *pi, int cont, int regr, int val) 65258945Sroberto{ 66258945Sroberto int r = regr + cont_map[cont]; 67258945Sroberto 68258945Sroberto switch (pi->mode) { 69258945Sroberto case 0: 70258945Sroberto case 1: 71258945Sroberto w0(r); P1; w0(val); P2; 72258945Sroberto break; 73258945Sroberto case 2: 74258945Sroberto case 3: 75258945Sroberto case 4: 76258945Sroberto w3(r); (void)r1(); w4(val); 77258945Sroberto break; 78258945Sroberto } 79258945Sroberto} 80258945Sroberto 81258945Srobertostatic void comm_connect(struct pi_adapter *pi) 82258945Sroberto{ 83258945Sroberto pi->saved_r0 = r0(); 84258945Sroberto pi->saved_r2 = r2(); 85258945Sroberto w2(4); w0(0xff); w2(6); 86258945Sroberto w2(4); w0(0xaa); w2(6); 87258945Sroberto w2(4); w0(0x00); w2(6); 88258945Sroberto w2(4); w0(0x87); w2(6); 89258945Sroberto w2(4); w0(0xe0); w2(0xc); w2(0xc); w2(4); 90258945Sroberto} 91258945Sroberto 92258945Srobertostatic void comm_disconnect(struct pi_adapter *pi) 93258945Sroberto{ 94258945Sroberto w2(0); w2(0); w2(0); w2(4); 95258945Sroberto w0(pi->saved_r0); 96258945Sroberto w2(pi->saved_r2); 97258945Sroberto} 98258945Sroberto 99258945Srobertostatic void comm_read_block(struct pi_adapter *pi, char *buf, int count) 100258945Sroberto{ 101258945Sroberto int i, l, h; 102258945Sroberto 103258945Sroberto switch (pi->mode) { 104258945Sroberto case 0: 105258945Sroberto w0(0x48); P1; 106258945Sroberto for (i = 0; i < count; i++) { 107258945Sroberto w0(0); w2(6); l = r1(); 108258945Sroberto w0(0x80); h = r1(); w2(4); 109258945Sroberto buf[i] = j44(l, h); 110258945Sroberto } 111258945Sroberto break; 112258945Sroberto case 1: 113258945Sroberto w0(0x68); P1; w0(0); 114258945Sroberto for (i = 0; i < count; i++) { 115258945Sroberto w2(0x26); 116258945Sroberto buf[i] = r0(); 117258945Sroberto w2(0x24); 118258945Sroberto } 119258945Sroberto w2(4); 120258945Sroberto break; 121258945Sroberto case 2: 122258945Sroberto w3(0x68); (void)r1(); w2(0x24); 123258945Sroberto for (i = 0; i < count; i++) 124258945Sroberto buf[i] = r4(); 125258945Sroberto w2(4); 126258945Sroberto break; 127258945Sroberto case 3: 128 w3(0x68); (void)r1(); w2(0x24); 129 for (i = 0; i < count / 2; i++) 130 ((u16 *)buf)[i] = r4w(); 131 w2(4); 132 break; 133 case 4: 134 w3(0x68); (void)r1(); w2(0x24); 135 for (i = 0; i < count / 4; i++) 136 ((u32 *)buf)[i] = r4l(); 137 w2(4); 138 break; 139 } 140} 141 142/* NB: Watch out for the byte swapped writes ! */ 143static void comm_write_block(struct pi_adapter *pi, char *buf, int count) 144{ 145 int k; 146 147 switch (pi->mode) { 148 case 0: 149 case 1: 150 w0(0x68); P1; 151 for (k = 0; k < count; k++) { 152 w2(5); 153 w0(buf[k ^ 1]); 154 w2(7); 155 } 156 w2(5); w2(4); 157 break; 158 case 2: 159 w3(0x48); (void)r1(); 160 for (k = 0; k < count; k++) 161 w4(buf[k ^ 1]); 162 break; 163 case 3: 164 w3(0x48); (void)r1(); 165 for (k = 0; k < count / 2; k++) 166 w4w(swab16(((u16 *)buf)[k])); 167 break; 168 case 4: 169 w3(0x48); (void)r1(); 170 for (k = 0; k < count / 4; k++) 171 w4l(swab16(((u16 *)buf)[2 * k]) | 172 swab16(((u16 *)buf)[2 * k + 1]) << 16); 173 break; 174 } 175} 176 177static void comm_log_adapter(struct pi_adapter *pi) 178{ 179 char *mode_string[5] = { "4-bit", "8-bit", "EPP-8", "EPP-16", "EPP-32" }; 180 181 dev_info(&pi->dev, 182 "DataStor Commuter at 0x%x, mode %d (%s), delay %d\n", 183 pi->port, pi->mode, mode_string[pi->mode], pi->delay); 184} 185 186static struct pi_protocol comm = { 187 .owner = THIS_MODULE, 188 .name = "comm", 189 .max_mode = 5, 190 .epp_first = 2, 191 .default_delay = 1, 192 .max_units = 1, 193 .write_regr = comm_write_regr, 194 .read_regr = comm_read_regr, 195 .write_block = comm_write_block, 196 .read_block = comm_read_block, 197 .connect = comm_connect, 198 .disconnect = comm_disconnect, 199 .log_adapter = comm_log_adapter, 200}; 201 202MODULE_LICENSE("GPL"); 203MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>"); 204MODULE_DESCRIPTION("DataStor Commuter parallel port IDE adapter protocol driver"); 205module_pata_parport_driver(comm); 206