1 /* 2 aten.c (c) 1997-8 Grant R. Guenther <grant@torque.net> 3 Under the terms of the GNU General Public License. 4 5 aten.c is a low-level protocol driver for the ATEN EH-100 6 parallel port adapter. The EH-100 supports 4-bit and 8-bit 7 modes only. There is also an EH-132 which supports EPP mode 8 transfers. The EH-132 is not yet supported. 9 10 */ 11 12 #include <linux/module.h> 13 #include <linux/init.h> 14 #include <linux/delay.h> 15 #include <linux/kernel.h> 16 #include <linux/wait.h> 17 #include <linux/types.h> 18 #include <asm/io.h> 19 #include "pata_parport.h" 20 21 #define j44(a,b) ((((a>>4)&0x0f)|(b&0xf0))^0x88) 22 23 /* cont = 0 - access the IDE register file 24 cont = 1 - access the IDE command set 25 */ 26 27 static int cont_map[2] = { 0x08, 0x20 }; 28 29 static void aten_write_regr(struct pi_adapter *pi, int cont, int regr, int val) 30 31 { int r; 32 33 r = regr + cont_map[cont] + 0x80; 34 35 w0(r); w2(0xe); w2(6); w0(val); w2(7); w2(6); w2(0xc); 36 } 37 38 static int aten_read_regr(struct pi_adapter *pi, int cont, int regr) 39 40 { int a, b, r; 41 42 r = regr + cont_map[cont] + 0x40; 43 44 switch (pi->mode) { 45 46 case 0: w0(r); w2(0xe); w2(6); 47 w2(7); w2(6); w2(0); 48 a = r1(); w0(0x10); b = r1(); w2(0xc); 49 return j44(a,b); 50 51 case 1: r |= 0x10; 52 w0(r); w2(0xe); w2(6); w0(0xff); 53 w2(0x27); w2(0x26); w2(0x20); 54 a = r0(); 55 w2(0x26); w2(0xc); 56 return a; 57 } 58 return -1; 59 } 60 61 static void aten_read_block(struct pi_adapter *pi, char *buf, int count) 62 63 { int k, a, b, c, d; 64 65 switch (pi->mode) { 66 67 case 0: 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: w0(0x58); w2(0xe); w2(6); 79 for (k=0;k<count/2;k++) { 80 w2(0x27); w2(0x26); w2(0x22); 81 a = r0(); w2(0x20); b = r0(); 82 buf[2*k] = b; buf[2*k+1] = a; 83 } 84 w2(0x26); w2(0xc); 85 break; 86 } 87 } 88 89 static void aten_write_block(struct pi_adapter *pi, char *buf, int count) 90 91 { int k; 92 93 w0(0x88); w2(0xe); w2(6); 94 for (k=0;k<count/2;k++) { 95 w0(buf[2*k+1]); w2(0xe); w2(6); 96 w0(buf[2*k]); w2(7); w2(6); 97 } 98 w2(0xc); 99 } 100 101 static void aten_connect(struct pi_adapter *pi) 102 103 { pi->saved_r0 = r0(); 104 pi->saved_r2 = r2(); 105 w2(0xc); 106 } 107 108 static void aten_disconnect(struct pi_adapter *pi) 109 110 { w0(pi->saved_r0); 111 w2(pi->saved_r2); 112 } 113 114 static void aten_log_adapter(struct pi_adapter *pi) 115 116 { char *mode_string[2] = {"4-bit","8-bit"}; 117 118 dev_info(&pi->dev, "ATEN EH-100 at 0x%x, mode %d (%s), delay %d\n", 119 pi->port, pi->mode, mode_string[pi->mode], pi->delay); 120 } 121 122 static struct pi_protocol aten = { 123 .owner = THIS_MODULE, 124 .name = "aten", 125 .max_mode = 2, 126 .epp_first = 2, 127 .default_delay = 1, 128 .max_units = 1, 129 .write_regr = aten_write_regr, 130 .read_regr = aten_read_regr, 131 .write_block = aten_write_block, 132 .read_block = aten_read_block, 133 .connect = aten_connect, 134 .disconnect = aten_disconnect, 135 .log_adapter = aten_log_adapter, 136 }; 137 138 MODULE_LICENSE("GPL"); 139 module_pata_parport_driver(aten); 140