1 /* 2 comm.c (c) 1997-8 Grant R. Guenther <grant@torque.net> 3 Under the terms of the GNU General Public License. 4 5 comm.c is a low-level protocol driver for some older models 6 of the DataStor "Commuter" parallel to IDE adapter. Some of 7 the parallel port devices marketed by Arista currently 8 use this adapter. 9 */ 10 11 /* Changes: 12 13 1.01 GRG 1998.05.05 init_proto, release_proto 14 15 */ 16 17 #define COMM_VERSION "1.01" 18 19 #include <linux/module.h> 20 #include <linux/init.h> 21 #include <linux/delay.h> 22 #include <linux/kernel.h> 23 #include <linux/types.h> 24 #include <linux/wait.h> 25 #include <asm/io.h> 26 27 #include <linux/pata_parport.h> 28 29 /* mode codes: 0 nybble reads, 8-bit writes 30 1 8-bit reads and writes 31 2 8-bit EPP mode 32 */ 33 34 #define j44(a,b) (((a>>3)&0x0f)|((b<<1)&0xf0)) 35 36 #define P1 w2(5);w2(0xd);w2(0xd);w2(5);w2(4); 37 #define P2 w2(5);w2(7);w2(7);w2(5);w2(4); 38 39 /* cont = 0 - access the IDE register file 40 cont = 1 - access the IDE command set 41 */ 42 43 static int cont_map[2] = { 0x08, 0x10 }; 44 45 static int comm_read_regr( PIA *pi, int cont, int regr ) 46 47 { int l, h, r; 48 49 r = regr + cont_map[cont]; 50 51 switch (pi->mode) { 52 53 case 0: w0(r); P1; w0(0); 54 w2(6); l = r1(); w0(0x80); h = r1(); w2(4); 55 return j44(l,h); 56 57 case 1: w0(r+0x20); P1; 58 w0(0); w2(0x26); h = r0(); w2(4); 59 return h; 60 61 case 2: 62 case 3: 63 case 4: w3(r+0x20); (void)r1(); 64 w2(0x24); h = r4(); w2(4); 65 return h; 66 67 } 68 return -1; 69 } 70 71 static void comm_write_regr( PIA *pi, int cont, int regr, int val ) 72 73 { int r; 74 75 r = regr + cont_map[cont]; 76 77 switch (pi->mode) { 78 79 case 0: 80 case 1: w0(r); P1; w0(val); P2; 81 break; 82 83 case 2: 84 case 3: 85 case 4: w3(r); (void)r1(); w4(val); 86 break; 87 } 88 } 89 90 static void comm_connect ( PIA *pi ) 91 92 { pi->saved_r0 = r0(); 93 pi->saved_r2 = r2(); 94 w2(4); w0(0xff); w2(6); 95 w2(4); w0(0xaa); w2(6); 96 w2(4); w0(0x00); w2(6); 97 w2(4); w0(0x87); w2(6); 98 w2(4); w0(0xe0); w2(0xc); w2(0xc); w2(4); 99 } 100 101 static void comm_disconnect ( PIA *pi ) 102 103 { w2(0); w2(0); w2(0); w2(4); 104 w0(pi->saved_r0); 105 w2(pi->saved_r2); 106 } 107 108 static void comm_read_block( PIA *pi, char * buf, int count ) 109 110 { int i, l, h; 111 112 switch (pi->mode) { 113 114 case 0: w0(0x48); P1; 115 for(i=0;i<count;i++) { 116 w0(0); w2(6); l = r1(); 117 w0(0x80); h = r1(); w2(4); 118 buf[i] = j44(l,h); 119 } 120 break; 121 122 case 1: w0(0x68); P1; w0(0); 123 for(i=0;i<count;i++) { 124 w2(0x26); buf[i] = r0(); w2(0x24); 125 } 126 w2(4); 127 break; 128 129 case 2: w3(0x68); (void)r1(); w2(0x24); 130 for (i=0;i<count;i++) buf[i] = r4(); 131 w2(4); 132 break; 133 134 case 3: w3(0x68); (void)r1(); w2(0x24); 135 for (i=0;i<count/2;i++) ((u16 *)buf)[i] = r4w(); 136 w2(4); 137 break; 138 139 case 4: w3(0x68); (void)r1(); w2(0x24); 140 for (i=0;i<count/4;i++) ((u32 *)buf)[i] = r4l(); 141 w2(4); 142 break; 143 144 } 145 } 146 147 /* NB: Watch out for the byte swapped writes ! */ 148 149 static void comm_write_block( PIA *pi, char * buf, int count ) 150 151 { int k; 152 153 switch (pi->mode) { 154 155 case 0: 156 case 1: w0(0x68); P1; 157 for (k=0;k<count;k++) { 158 w2(5); w0(buf[k^1]); w2(7); 159 } 160 w2(5); w2(4); 161 break; 162 163 case 2: w3(0x48); (void)r1(); 164 for (k=0;k<count;k++) w4(buf[k^1]); 165 break; 166 167 case 3: w3(0x48); (void)r1(); 168 for (k=0;k<count/2;k++) w4w(pi_swab16(buf,k)); 169 break; 170 171 case 4: w3(0x48); (void)r1(); 172 for (k=0;k<count/4;k++) w4l(pi_swab32(buf,k)); 173 break; 174 175 176 } 177 } 178 179 static void comm_log_adapter( PIA *pi, char * scratch, int verbose ) 180 181 { char *mode_string[5] = {"4-bit","8-bit","EPP-8","EPP-16","EPP-32"}; 182 183 printk("%s: comm %s, DataStor Commuter at 0x%x, ", 184 pi->device,COMM_VERSION,pi->port); 185 printk("mode %d (%s), delay %d\n",pi->mode, 186 mode_string[pi->mode],pi->delay); 187 188 } 189 190 static struct pi_protocol comm = { 191 .owner = THIS_MODULE, 192 .name = "comm", 193 .max_mode = 5, 194 .epp_first = 2, 195 .default_delay = 1, 196 .max_units = 1, 197 .write_regr = comm_write_regr, 198 .read_regr = comm_read_regr, 199 .write_block = comm_write_block, 200 .read_block = comm_read_block, 201 .connect = comm_connect, 202 .disconnect = comm_disconnect, 203 .log_adapter = comm_log_adapter, 204 }; 205 206 static int __init comm_init(void) 207 { 208 return paride_register(&comm); 209 } 210 211 static void __exit comm_exit(void) 212 { 213 paride_unregister(&comm); 214 } 215 216 MODULE_LICENSE("GPL"); 217 module_init(comm_init) 218 module_exit(comm_exit) 219