nvram.c revision 1.10
1 /* $NetBSD: nvram.c,v 1.10 2003/07/15 01:19:52 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1995 Leo Weppelman. 5 * 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Leo Weppelman. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * Nvram driver 35 */ 36 37 #include <sys/cdefs.h> 38 __KERNEL_RCSID(0, "$NetBSD: nvram.c,v 1.10 2003/07/15 01:19:52 lukem Exp $"); 39 40 #include <sys/param.h> 41 #include <sys/conf.h> 42 #include <sys/kernel.h> 43 #include <sys/proc.h> 44 #include <sys/systm.h> 45 #include <sys/device.h> 46 #include <sys/buf.h> 47 #include <sys/uio.h> 48 49 #include <machine/iomap.h> 50 #include <machine/cpu.h> 51 52 #include <atari/dev/clockreg.h> 53 #include <atari/dev/nvramvar.h> 54 55 #include "nvr.h" 56 57 #define MC_NVRAM_CSUM (MC_NVRAM_START + MC_NVRAM_SIZE - 2) 58 59 #if NNVR > 0 60 static void nvram_set_csum __P((u_char csum)); 61 static int nvram_csum_valid __P((u_char csum)); 62 static u_char nvram_csum __P((void)); 63 64 /* 65 * Auto config stuff.... 66 */ 67 static void nvr_attach __P((struct device *, struct device *, void *)); 68 static int nvr_match __P((struct device *, struct cfdata *, void *)); 69 70 CFATTACH_DECL(nvr, sizeof(struct nvr_softc), 71 nvr_match, nvr_attach, NULL, NULL); 72 73 extern struct cfdriver nvr_cd; 74 75 /*ARGSUSED*/ 76 static int 77 nvr_match(pdp, cfp, auxp) 78 struct device *pdp; 79 struct cfdata *cfp; 80 void *auxp; 81 { 82 if (!strcmp((char *)auxp, "nvr")) 83 return (1); 84 return (0); 85 } 86 87 /*ARGSUSED*/ 88 static void 89 nvr_attach(pdp, dp, auxp) 90 struct device *pdp, *dp; 91 void *auxp; 92 { 93 struct nvr_softc *nvr_soft; 94 int nreg; 95 96 /* 97 * Check the validity of the NVram contents 98 */ 99 if (!nvram_csum_valid(nvram_csum())) { 100 printf(": Invalid checksum - re-initialized"); 101 for (nreg = MC_NVRAM_START; nreg < MC_NVRAM_CSUM; nreg++) 102 mc146818_write(RTC, nreg, 0); 103 nvram_set_csum(nvram_csum()); 104 } 105 nvr_soft = nvr_cd.cd_devs[0]; 106 nvr_soft->nvr_flags = NVR_CONFIGURED; 107 printf("\n"); 108 } 109 /* 110 * End of auto config stuff.... 111 */ 112 #endif /* NNVR > 0 */ 113 114 /* 115 * Kernel internal interface 116 */ 117 int 118 nvr_get_byte(byteno) 119 int byteno; 120 { 121 #if NNVR > 0 122 struct nvr_softc *nvr_soft; 123 124 nvr_soft = nvr_cd.cd_devs[0]; 125 if (!(nvr_soft->nvr_flags & NVR_CONFIGURED)) 126 return(NVR_INVALID); 127 return (mc146818_read(RTC, byteno + MC_NVRAM_START) & 0xff); 128 #else 129 return(NVR_INVALID); 130 #endif /* NNVR > 0 */ 131 } 132 133 #if NNVR > 0 134 135 int 136 nvram_uio(uio) 137 struct uio *uio; 138 { 139 int i; 140 off_t offset; 141 int nleft; 142 u_char buf[MC_NVRAM_CSUM - MC_NVRAM_START + 1]; 143 u_char *p; 144 struct nvr_softc *nvr_soft; 145 146 nvr_soft = nvr_cd.cd_devs[0]; 147 if (!(nvr_soft->nvr_flags & NVR_CONFIGURED)) 148 return ENXIO; 149 150 #ifdef NV_DEBUG 151 printf("Request to transfer %d bytes offset: %d, %s nvram\n", 152 (long)uio->uio_resid, (long)uio->uio_offset, 153 (uio->uio_rw == UIO_READ) ? "from" : "to"); 154 #endif /* NV_DEBUG */ 155 156 offset = uio->uio_offset + MC_NVRAM_START; 157 nleft = uio->uio_resid; 158 if (offset + nleft >= MC_NVRAM_CSUM) { 159 if (offset == MC_NVRAM_CSUM) 160 return (0); 161 nleft = MC_NVRAM_CSUM - offset; 162 if (nleft <= 0) 163 return (EINVAL); 164 } 165 #ifdef NV_DEBUG 166 printf("Translated: offset = %d, bytes: %d\n", (long)offset, nleft); 167 #endif /* NV_DEBUG */ 168 169 if (uio->uio_rw == UIO_READ) { 170 for (i = 0, p = buf; i < nleft; i++, p++) 171 *p = mc146818_read(RTC, offset + i); 172 } 173 if ((i = uiomove(buf, nleft, uio)) != 0) 174 return (i); 175 if (uio->uio_rw == UIO_WRITE) { 176 for (i = 0, p = buf; i < nleft; i++, p++) 177 mc146818_write(RTC, offset + i, *p); 178 nvram_set_csum(nvram_csum()); 179 } 180 return(0); 181 } 182 183 static u_char 184 nvram_csum() 185 { 186 u_char csum; 187 int nreg; 188 189 for (csum = 0, nreg = MC_NVRAM_START; nreg < MC_NVRAM_CSUM; nreg++) 190 csum += mc146818_read(RTC, nreg); 191 return(csum); 192 } 193 194 static int 195 nvram_csum_valid(csum) 196 u_char csum; 197 { 198 if (((~csum & 0xff) != mc146818_read(RTC, MC_NVRAM_CSUM)) 199 || (csum != mc146818_read(RTC, MC_NVRAM_CSUM + 1))) 200 return 0; 201 return 1; 202 } 203 204 static void 205 nvram_set_csum(csum) 206 u_char csum; 207 { 208 mc146818_write(RTC, MC_NVRAM_CSUM, ~csum); 209 mc146818_write(RTC, MC_NVRAM_CSUM + 1, csum); 210 } 211 #endif /* NNVR > 0 */ 212
Indexes created Tue Sep 23 14:10:03 GMT 2025