ofrom.c revision 1.4
1/* $NetBSD: ofrom.c,v 1.4 2002/06/08 16:44:14 yamt Exp $ */ 2 3/* 4 * Copyright 1998 5 * Digital Equipment Corporation. All rights reserved. 6 * 7 * This software is furnished under license and may be used and 8 * copied only in accordance with the following terms and conditions. 9 * Subject to these conditions, you may download, copy, install, 10 * use, modify and distribute this software in source and/or binary 11 * form. No title or ownership is transferred hereby. 12 * 13 * 1) Any source code used, modified or distributed must reproduce 14 * and retain this copyright notice and list of conditions as 15 * they appear in the source file. 16 * 17 * 2) No right is granted to use any trade name, trademark, or logo of 18 * Digital Equipment Corporation. Neither the "Digital Equipment 19 * Corporation" name nor any trademark or logo of Digital Equipment 20 * Corporation may be used to endorse or promote products derived 21 * from this software without the prior written permission of 22 * Digital Equipment Corporation. 23 * 24 * 3) This software is provided "AS-IS" and any express or implied 25 * warranties, including but not limited to, any implied warranties 26 * of merchantability, fitness for a particular purpose, or 27 * non-infringement are disclaimed. In no event shall DIGITAL be 28 * liable for any damages whatsoever, and in particular, DIGITAL 29 * shall not be liable for special, indirect, consequential, or 30 * incidental damages or damages for lost profits, loss of 31 * revenue or loss of use, whether such damages arise in contract, 32 * negligence, tort, under statute, in equity, at law or otherwise, 33 * even if advised of the possibility of such damage. 34 */ 35 36/* 37 * XXX open for writing (for user programs to mmap, and write contents) 38 */ 39 40#include <sys/param.h> 41#include <sys/device.h> 42#include <sys/systm.h> 43#include <sys/conf.h> 44#include <sys/fcntl.h> 45 46#include <uvm/uvm_extern.h> 47 48#include <machine/bus.h> 49#include <dev/ofw/openfirm.h> 50 51struct ofrom_softc { 52 struct device sc_dev; 53 int enabled; 54 vm_offset_t base; 55 vm_size_t size; 56}; 57 58int ofromprobe __P((struct device *, struct cfdata *, void *)); 59void ofromattach __P((struct device *, struct device *, void *)); 60 61struct cfattach ofrom_ca = { 62 sizeof(struct ofrom_softc), ofromprobe, ofromattach 63}; 64 65extern struct cfdriver ofrom_cd; 66 67cdev_decl(ofrom); 68 69int 70ofromprobe(parent, cf, aux) 71 struct device *parent; 72 struct cfdata *cf; 73 void *aux; 74{ 75 struct ofbus_attach_args *oba = aux; 76 static const char *const compatible_strings[] = { "rom", NULL }; 77 78 return (of_compatible(oba->oba_phandle, compatible_strings) == -1) ? 79 0 : 5; 80} 81 82 83void 84ofromattach(parent, self, aux) 85 struct device *parent, *self; 86 void *aux; 87{ 88 struct ofrom_softc *sc = (struct ofrom_softc *)self; 89 struct ofbus_attach_args *oba = aux; 90 char regbuf[8]; 91 92 if (OF_getproplen(oba->oba_phandle, "reg") != 8) { 93 printf(": invalid reg property\n"); 94 return; 95 } 96 if (OF_getprop(oba->oba_phandle, "reg", regbuf, sizeof regbuf) != 8) { 97 printf(": couldn't read reg property\n"); 98 return; 99 } 100 sc->base = of_decode_int(®buf[0]); 101 sc->size = of_decode_int(®buf[4]); 102 sc->enabled = 1; 103 104 printf(": %#lx-%#lx\n", sc->base, sc->base + sc->size - 1); 105} 106 107int 108ofromopen(dev, oflags, devtype, p) 109 dev_t dev; 110 int oflags, devtype; 111 struct proc *p; 112{ 113 struct ofrom_softc *sc; 114 int unit = minor(dev); 115 116 if (unit >= ofrom_cd.cd_ndevs) 117 return (ENXIO); 118 sc = ofrom_cd.cd_devs[unit]; 119 if (!sc || !sc->enabled) 120 return (ENXIO); 121 122 if (oflags & FWRITE) 123 return (EINVAL); 124 125 return (0); 126} 127 128int 129ofromclose(dev, fflag, devtype, p) 130 dev_t dev; 131 int fflag, devtype; 132 struct proc *p; 133{ 134 135 return (0); 136} 137 138int 139ofromrw(dev, uio, flags) 140 dev_t dev; 141 struct uio *uio; 142 int flags; 143{ 144 struct ofrom_softc *sc; 145 int c, error = 0, unit = minor(dev); 146 struct iovec *iov; 147 vm_offset_t o, v; 148 extern int physlock; 149 extern char *memhook; 150 151 if (unit >= ofrom_cd.cd_ndevs) 152 return (ENXIO); /* XXX PANIC */ 153 sc = ofrom_cd.cd_devs[unit]; 154 if (!sc || !sc->enabled) 155 return (ENXIO); /* XXX PANIC */ 156 157 /* lock against other uses of shared vmmap */ 158 while (physlock > 0) { 159 physlock++; 160 error = tsleep((caddr_t)&physlock, PZERO | PCATCH, "ofromrw", 161 0); 162 if (error) 163 return (error); 164 } 165 physlock = 1; 166 167 while (uio->uio_resid > 0 && error == 0) { 168 iov = uio->uio_iov; 169 if (iov->iov_len == 0) { 170 uio->uio_iov++; 171 uio->uio_iovcnt--; 172 if (uio->uio_iovcnt < 0) 173 panic("ofromrw"); 174 continue; 175 } 176 177 /* 178 * Since everything is page aligned and no more 179 * than the rest of a page is done at once, we 180 * can just check that the offset isn't too big. 181 */ 182 if (uio->uio_offset >= sc->size) 183 break; 184 185 v = sc->base + uio->uio_offset; 186 pmap_enter(pmap_kernel(), (vm_offset_t)memhook, 187 trunc_page(v), uio->uio_rw == UIO_READ ? 188 VM_PROT_READ : VM_PROT_WRITE, PMAP_WIRED); 189 pmap_update(pmap_kernel()); 190 o = uio->uio_offset & PGOFSET; 191 c = min(uio->uio_resid, (int)(NBPG - o)); 192 error = uiomove((caddr_t)memhook + o, c, uio); 193 pmap_remove(pmap_kernel(), (vm_offset_t)memhook, 194 (vm_offset_t)memhook + NBPG); 195 pmap_update(pmap_kernel()); 196 } 197 198 if (physlock > 1) 199 wakeup((caddr_t)&physlock); 200 physlock = 0; 201 202 return (error); 203} 204 205int 206ofromioctl(dev, cmd, data, flag, p) 207 dev_t dev; 208 u_long cmd; 209 caddr_t data; 210 int flag; 211 struct proc *p; 212{ 213 214 return (ENOTTY); 215} 216 217paddr_t 218ofrommmap(dev, off, prot) 219 dev_t dev; 220 off_t off; 221 int prot; 222{ 223 struct ofrom_softc *sc; 224 int unit = minor(dev); 225 226 if (unit >= ofrom_cd.cd_ndevs) 227 return (-1); /* XXX PANIC */ 228 sc = ofrom_cd.cd_devs[unit]; 229 if (!sc || !sc->enabled) 230 return (-1); /* XXX PANIC */ 231 232 if ((u_int)off >= sc->size) 233 return (-1); 234 235 return arm_btop(sc->base + off); 236} 237