1 /* $NetBSD: scifcons.c,v 1.2 2008/04/28 20:23:26 martin Exp $ */ 2 /* NetBSD: scif.c,v 1.38 2004/12/13 02:14:13 chs Exp */ 3 4 /*- 5 * Copyright (C) 1999 T.Horiuchi and SAITOH Masanobu. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 /*- 31 * Copyright (c) 1998, 1999 The NetBSD Foundation, Inc. 32 * All rights reserved. 33 * 34 * This code is derived from software contributed to The NetBSD Foundation 35 * by Charles M. Hannum. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 46 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 47 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 48 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 49 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 50 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 51 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 52 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 53 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 54 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 55 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 56 * POSSIBILITY OF SUCH DAMAGE. 57 */ 58 59 /* 60 * Copyright (c) 1991 The Regents of the University of California. 61 * All rights reserved. 62 * 63 * Redistribution and use in source and binary forms, with or without 64 * modification, are permitted provided that the following conditions 65 * are met: 66 * 1. Redistributions of source code must retain the above copyright 67 * notice, this list of conditions and the following disclaimer. 68 * 2. Redistributions in binary form must reproduce the above copyright 69 * notice, this list of conditions and the following disclaimer in the 70 * documentation and/or other materials provided with the distribution. 71 * 3. Neither the name of the University nor the names of its contributors 72 * may be used to endorse or promote products derived from this software 73 * without specific prior written permission. 74 * 75 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 76 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 77 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 78 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 79 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 80 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 81 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 82 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 83 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 84 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 85 * SUCH DAMAGE. 86 * 87 * @(#)com.c 7.5 (Berkeley) 5/16/91 88 */ 89 90 /* 91 * SH internal serial driver 92 * 93 * This code is derived from both z8530tty.c and com.c 94 */ 95 96 #include <lib/libsa/stand.h> 97 #include <lib/libkern/libkern.h> 98 99 #include <sh3/scifreg.h> 100 101 #include "boot.h" 102 #include "cons.h" 103 104 #define scif_smr_read() SHREG_SCSMR2 105 #define scif_smr_write(v) (SHREG_SCSMR2 = (v)) 106 107 #define scif_brr_read() SHREG_SCBRR2 108 #define scif_brr_write(v) (SHREG_SCBRR2 = (v)) 109 110 #define scif_scr_read() SHREG_SCSCR2 111 #define scif_scr_write(v) (SHREG_SCSCR2 = (v)) 112 113 #define scif_ftdr_write(v) (SHREG_SCFTDR2 = (v)) 114 115 #define scif_ssr_read() SHREG_SCSSR2 116 #define scif_ssr_write(v) (SHREG_SCSSR2 = (v)) 117 118 #define scif_frdr_read() SHREG_SCFRDR2 119 120 #define scif_fcr_read() SHREG_SCFCR2 121 #define scif_fcr_write(v) (SHREG_SCFCR2 = (v)) 122 123 #define scif_fdr_read() SHREG_SCFDR2 124 125 #define scif_sptr_read() SHREG_SCSPTR2 126 #define scif_sptr_write(v) (SHREG_SCSPTR2 = (v)) 127 128 #define scif_lsr_read() SHREG_SCLSR2 129 #define scif_lsr_write(v) (SHREG_SCLSR2 = (v)) 130 131 #define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */ 132 133 #define SERBUFSIZE 16 134 static u_char serbuf[SERBUFSIZE]; 135 static int serbuf_read = 0; 136 static int serbuf_write = 0; 137 138 void 139 scif_init(unsigned int bps) 140 { 141 142 serbuf_read = 0; 143 serbuf_write = 0; 144 145 /* Initialize SCR */ 146 scif_scr_write(0x00); 147 148 /* Clear FIFO */ 149 scif_fcr_write(SCFCR2_TFRST | SCFCR2_RFRST); 150 151 /* Serial Mode Register */ 152 scif_smr_write(0x00); /* 8bit,NonParity,Even,1Stop */ 153 154 /* Bit Rate Register */ 155 scif_brr_write(divrnd(PCLOCK, 32 * bps) - 1); 156 157 delay(100); 158 159 scif_sptr_write(SCSPTR2_RTSIO); 160 161 scif_fcr_write(FIFO_RCV_TRIGGER_1 | FIFO_XMT_TRIGGER_8); 162 163 /* Send permission, Receive permission ON */ 164 scif_scr_write(SCSCR2_TE | SCSCR2_RE); 165 166 /* Serial Status Register */ 167 scif_ssr_write(scif_ssr_read() & SCSSR2_TDFE); /* Clear Status */ 168 } 169 170 int 171 scif_getc(void) 172 { 173 unsigned char c, err_c; 174 unsigned short err_c2; 175 176 if (serbuf_read != serbuf_write) { 177 c = serbuf[serbuf_read]; 178 serbuf_read = (serbuf_read + 1) % SERBUFSIZE; 179 return (c); 180 } 181 182 for (;;) { 183 /* wait for ready */ 184 while ((scif_fdr_read() & SCFDR2_RECVCNT) == 0) 185 continue; 186 187 c = scif_frdr_read(); 188 err_c = scif_ssr_read(); 189 scif_ssr_write(scif_ssr_read() 190 & ~(SCSSR2_ER | SCSSR2_BRK | SCSSR2_RDF | SCSSR2_DR)); 191 192 err_c2 = scif_lsr_read(); 193 scif_lsr_write(scif_lsr_read() & ~SCLSR2_ORER); 194 195 if ((err_c & (SCSSR2_ER | SCSSR2_BRK | SCSSR2_FER 196 | SCSSR2_PER)) == 0) { 197 if ((err_c2 & SCLSR2_ORER) == 0) { 198 return (c); 199 } 200 } 201 } 202 } 203 204 void 205 scif_putc(int c) 206 { 207 208 /* wait for ready */ 209 while ((scif_fdr_read() & SCFDR2_TXCNT) == SCFDR2_TXF_FULL) 210 continue; 211 212 /* write send data to send register */ 213 scif_ftdr_write(c); 214 215 /* clear ready flag */ 216 scif_ssr_write(scif_ssr_read() & ~(SCSSR2_TDFE | SCSSR2_TEND)); 217 } 218 219 int 220 scif_status(void) 221 { 222 unsigned char c, err_c; 223 unsigned short err_c2; 224 225 /* check if any preread input is already there */ 226 if (serbuf_read != serbuf_write) 227 return (1); 228 229 if (scif_fdr_read() & SCFDR2_RECVCNT) { 230 c = scif_frdr_read(); 231 err_c = scif_ssr_read(); 232 scif_ssr_write(scif_ssr_read() 233 & ~(SCSSR2_ER | SCSSR2_BRK | SCSSR2_RDF | SCSSR2_DR)); 234 235 err_c2 = scif_lsr_read(); 236 scif_lsr_write(scif_lsr_read() & ~SCLSR2_ORER); 237 238 if ((err_c & (SCSSR2_ER | SCSSR2_BRK | SCSSR2_FER 239 | SCSSR2_PER)) == 0) { 240 if ((err_c2 & SCLSR2_ORER) == 0) { 241 /* stuff char into preread buffer */ 242 serbuf[serbuf_write] = (u_char)c; 243 serbuf_write = (serbuf_write + 1) % SERBUFSIZE; 244 return (1); 245 } 246 } 247 } 248 return (0); /* nothing out there... */ 249 } 250 251 int 252 scif_status2(void) 253 { 254 255 if (scif_fdr_read() & SCFDR2_RECVCNT) { 256 return (1); 257 } 258 return (0); 259 } 260
Indexes created Wed Sep 24 05:09:52 GMT 2025