1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * (c) 1998 Grant R. Guenther <grant@torque.net> 4 * 5 * friq.c is a low-level protocol driver for the Freecom "IQ" 6 * parallel port IDE adapter. Early versions of this adapter 7 * use the 'frpw' protocol. 8 * 9 * Freecom uses this adapter in a battery powered external 10 * CD-ROM drive. It is also used in LS-120 drives by 11 * Maxell and Panasonic, and other devices. 12 * 13 * The battery powered drive requires software support to 14 * control the power to the drive. This module enables the 15 * drive power when the high level driver (pcd) is loaded 16 * and disables it when the module is unloaded. Note, if 17 * the friq module is built in to the kernel, the power 18 * will never be switched off, so other means should be 19 * used to conserve battery power. 20 */ 21 22 #include <linux/module.h> 23 #include <linux/init.h> 24 #include <linux/delay.h> 25 #include <linux/kernel.h> 26 #include <linux/types.h> 27 #include <linux/wait.h> 28 #include <asm/io.h> 29 #include "pata_parport.h" 30 31 #define CMD(x) \ 32 do { \ 33 w2(4); w0(0xff); w0(0xff); w0(0x73); w0(0x73); \ 34 w0(0xc9); w0(0xc9); w0(0x26); \ 35 w0(0x26); w0(x); w0(x); \ 36 } while (0) 37 38 #define j44(l, h) (((l >> 4) & 0x0f) | (h & 0xf0)) 39 40 /* 41 * cont = 0 - access the IDE register file 42 * cont = 1 - access the IDE command set 43 */ 44 static int cont_map[2] = { 0x08, 0x10 }; 45 46 static int friq_read_regr(struct pi_adapter *pi, int cont, int regr) 47 { 48 int h, l, r; 49 50 r = regr + cont_map[cont]; 51 52 CMD(r); 53 w2(6); l = r1(); 54 w2(4); h = r1(); 55 w2(4); 56 57 return j44(l, h); 58 } 59 60 static void friq_write_regr(struct pi_adapter *pi, int cont, int regr, int val) 61 { 62 int r = regr + cont_map[cont]; 63 64 CMD(r); 65 w0(val); 66 w2(5); w2(7); w2(5); w2(4); 67 } 68 69 static void friq_read_block_int(struct pi_adapter *pi, char *buf, int count, int regr) 70 { 71 int h, l, k, ph; 72 73 switch (pi->mode) { 74 case 0: 75 CMD(regr); 76 for (k = 0; k < count; k++) { 77 w2(6); l = r1(); 78 w2(4); h = r1(); 79 buf[k] = j44(l, h); 80 } 81 w2(4); 82 break; 83 case 1: 84 ph = 2; 85 CMD(regr + 0xc0); 86 w0(0xff); 87 for (k = 0; k < count; k++) { 88 w2(0xa4 + ph); 89 buf[k] = r0(); 90 ph = 2 - ph; 91 } 92 w2(0xac); w2(0xa4); w2(4); 93 break; 94 case 2: 95 CMD(regr + 0x80); 96 for (k = 0; k < count - 2; k++) 97 buf[k] = r4(); 98 w2(0xac); w2(0xa4); 99 buf[count - 2] = r4(); 100 buf[count - 1] = r4(); 101 w2(4); 102 break; 103 case 3: 104 CMD(regr + 0x80); 105 for (k = 0; k < count / 2 - 1; k++) 106 ((u16 *)buf)[k] = r4w(); 107 w2(0xac); w2(0xa4); 108 buf[count - 2] = r4(); 109 buf[count - 1] = r4(); 110 w2(4); 111 break; 112 case 4: 113 CMD(regr + 0x80); 114 for (k = 0; k < count / 4 - 1; k++) 115 ((u32 *)buf)[k] = r4l(); 116 buf[count - 4] = r4(); 117 buf[count - 3] = r4(); 118 w2(0xac); w2(0xa4); 119 buf[count - 2] = r4(); 120 buf[count - 1] = r4(); 121 w2(4); 122 break; 123 } 124 } 125 126 static void friq_read_block(struct pi_adapter *pi, char *buf, int count) 127 { 128 friq_read_block_int(pi, buf, count, 0x08); 129 } 130 131 static void friq_write_block(struct pi_adapter *pi, char *buf, int count) 132 { 133 int k; 134 135 switch (pi->mode) { 136 case 0: 137 case 1: 138 CMD(8); w2(5); 139 for (k = 0; k < count; k++) { 140 w0(buf[k]); 141 w2(7); w2(5); 142 } 143 w2(4); 144 break; 145 case 2: 146 CMD(0xc8); w2(5); 147 for (k = 0; k < count; k++) 148 w4(buf[k]); 149 w2(4); 150 break; 151 case 3: 152 CMD(0xc8); w2(5); 153 for (k = 0; k < count / 2; k++) 154 w4w(((u16 *)buf)[k]); 155 w2(4); 156 break; 157 case 4: 158 CMD(0xc8); w2(5); 159 for (k = 0; k < count / 4; k++) 160 w4l(((u32 *)buf)[k]); 161 w2(4); 162 break; 163 } 164 } 165 166 static void friq_connect(struct pi_adapter *pi) 167 { 168 pi->saved_r0 = r0(); 169 pi->saved_r2 = r2(); 170 w2(4); 171 } 172 173 static void friq_disconnect(struct pi_adapter *pi) 174 { 175 CMD(0x20); 176 w0(pi->saved_r0); 177 w2(pi->saved_r2); 178 } 179 180 static int friq_test_proto(struct pi_adapter *pi) 181 { 182 int j, k, r; 183 int e[2] = { 0, 0 }; 184 char scratch[512]; 185 186 pi->saved_r0 = r0(); 187 w0(0xff); udelay(20); CMD(0x3d); /* turn the power on */ 188 udelay(500); 189 w0(pi->saved_r0); 190 191 friq_connect(pi); 192 for (j = 0; j < 2; j++) { 193 friq_write_regr(pi, 0, 6, 0xa0 + j * 0x10); 194 for (k = 0; k < 256; k++) { 195 friq_write_regr(pi, 0, 2, k ^ 0xaa); 196 friq_write_regr(pi, 0, 3, k ^ 0x55); 197 if (friq_read_regr(pi, 0, 2) != (k ^ 0xaa)) 198 e[j]++; 199 } 200 } 201 friq_disconnect(pi); 202 203 friq_connect(pi); 204 friq_read_block_int(pi, scratch, 512, 0x10); 205 r = 0; 206 for (k = 0; k < 128; k++) { 207 if (scratch[k] != k) 208 r++; 209 } 210 friq_disconnect(pi); 211 212 dev_dbg(&pi->dev, 213 "friq: port 0x%x, mode %d, test=(%d,%d,%d)\n", 214 pi->port, pi->mode, e[0], e[1], r); 215 216 return r || (e[0] && e[1]); 217 } 218 219 static void friq_log_adapter(struct pi_adapter *pi) 220 { 221 char *mode_string[6] = { "4-bit", "8-bit", "EPP-8", "EPP-16", "EPP-32"}; 222 223 dev_info(&pi->dev, 224 "Freecom IQ ASIC-2 adapter at 0x%x, mode %d (%s), delay %d\n", 225 pi->port, pi->mode, mode_string[pi->mode], pi->delay); 226 227 pi->private = 1; 228 friq_connect(pi); 229 CMD(0x9e); /* disable sleep timer */ 230 friq_disconnect(pi); 231 } 232 233 static void friq_release_proto(struct pi_adapter *pi) 234 { 235 if (pi->private) { /* turn off the power */ 236 friq_connect(pi); 237 CMD(0x1d); CMD(0x1e); 238 friq_disconnect(pi); 239 pi->private = 0; 240 } 241 } 242 243 static struct pi_protocol friq = { 244 .owner = THIS_MODULE, 245 .name = "friq", 246 .max_mode = 5, 247 .epp_first = 2, 248 .default_delay = 1, 249 .max_units = 1, 250 .write_regr = friq_write_regr, 251 .read_regr = friq_read_regr, 252 .write_block = friq_write_block, 253 .read_block = friq_read_block, 254 .connect = friq_connect, 255 .disconnect = friq_disconnect, 256 .test_proto = friq_test_proto, 257 .log_adapter = friq_log_adapter, 258 .release_proto = friq_release_proto, 259 }; 260 261 MODULE_LICENSE("GPL"); 262 MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>"); 263 MODULE_DESCRIPTION("Freecom IQ parallel port IDE adapter protocol driver"); 264 module_pata_parport_driver(friq); 265