1 /* 2 on20.c (c) 1996-8 Grant R. Guenther <grant@torque.net> 3 Under the terms of the GNU General Public License. 4 5 on20.c is a low-level protocol driver for the 6 Onspec 90c20 parallel to IDE adapter. 7 */ 8 9 /* Changes: 10 11 1.01 GRG 1998.05.06 init_proto, release_proto 12 13 */ 14 15 #define ON20_VERSION "1.01" 16 17 #include <linux/module.h> 18 #include <linux/init.h> 19 #include <linux/delay.h> 20 #include <linux/kernel.h> 21 #include <linux/types.h> 22 #include <linux/wait.h> 23 #include <asm/io.h> 24 25 #include <linux/pata_parport.h> 26 27 #define op(f) w2(4);w0(f);w2(5);w2(0xd);w2(5);w2(0xd);w2(5);w2(4); 28 #define vl(v) w2(4);w0(v);w2(5);w2(7);w2(5);w2(4); 29 30 #define j44(a,b) (((a>>4)&0x0f)|(b&0xf0)) 31 32 /* cont = 0 - access the IDE register file 33 cont = 1 - access the IDE command set 34 */ 35 36 static int on20_read_regr( PIA *pi, int cont, int regr ) 37 38 { int h,l, r ; 39 40 r = (regr<<2) + 1 + cont; 41 42 op(1); vl(r); op(0); 43 44 switch (pi->mode) { 45 46 case 0: w2(4); w2(6); l = r1(); 47 w2(4); w2(6); h = r1(); 48 w2(4); w2(6); w2(4); w2(6); w2(4); 49 return j44(l,h); 50 51 case 1: w2(4); w2(0x26); r = r0(); 52 w2(4); w2(0x26); w2(4); 53 return r; 54 55 } 56 return -1; 57 } 58 59 static void on20_write_regr( PIA *pi, int cont, int regr, int val ) 60 61 { int r; 62 63 r = (regr<<2) + 1 + cont; 64 65 op(1); vl(r); 66 op(0); vl(val); 67 op(0); vl(val); 68 } 69 70 static void on20_connect ( PIA *pi) 71 72 { pi->saved_r0 = r0(); 73 pi->saved_r2 = r2(); 74 75 w2(4);w0(0);w2(0xc);w2(4);w2(6);w2(4);w2(6);w2(4); 76 if (pi->mode) { op(2); vl(8); op(2); vl(9); } 77 else { op(2); vl(0); op(2); vl(8); } 78 } 79 80 static void on20_disconnect ( PIA *pi ) 81 82 { w2(4);w0(7);w2(4);w2(0xc);w2(4); 83 w0(pi->saved_r0); 84 w2(pi->saved_r2); 85 } 86 87 static void on20_read_block( PIA *pi, char * buf, int count ) 88 89 { int k, l, h; 90 91 op(1); vl(1); op(0); 92 93 for (k=0;k<count;k++) 94 if (pi->mode) { 95 w2(4); w2(0x26); buf[k] = r0(); 96 } else { 97 w2(6); l = r1(); w2(4); 98 w2(6); h = r1(); w2(4); 99 buf[k] = j44(l,h); 100 } 101 w2(4); 102 } 103 104 static void on20_write_block( PIA *pi, char * buf, int count ) 105 106 { int k; 107 108 op(1); vl(1); op(0); 109 110 for (k=0;k<count;k++) { w2(5); w0(buf[k]); w2(7); } 111 w2(4); 112 } 113 114 static void on20_log_adapter( PIA *pi, char * scratch, int verbose ) 115 116 { char *mode_string[2] = {"4-bit","8-bit"}; 117 118 printk("%s: on20 %s, OnSpec 90c20 at 0x%x, ", 119 pi->device,ON20_VERSION,pi->port); 120 printk("mode %d (%s), delay %d\n",pi->mode, 121 mode_string[pi->mode],pi->delay); 122 123 } 124 125 static struct pi_protocol on20 = { 126 .owner = THIS_MODULE, 127 .name = "on20", 128 .max_mode = 2, 129 .epp_first = 2, 130 .default_delay = 1, 131 .max_units = 1, 132 .write_regr = on20_write_regr, 133 .read_regr = on20_read_regr, 134 .write_block = on20_write_block, 135 .read_block = on20_read_block, 136 .connect = on20_connect, 137 .disconnect = on20_disconnect, 138 .log_adapter = on20_log_adapter, 139 }; 140 141 static int __init on20_init(void) 142 { 143 return paride_register(&on20); 144 } 145 146 static void __exit on20_exit(void) 147 { 148 paride_unregister(&on20); 149 } 150 151 MODULE_LICENSE("GPL"); 152 module_init(on20_init) 153 module_exit(on20_exit) 154