1 /* $NetBSD: ofrom.c,v 1.9 2002/10/23 09:12:00 jdolecek 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 51 struct ofrom_softc { 52 struct device sc_dev; 53 int enabled; 54 vm_offset_t base; 55 vm_size_t size; 56 }; 57 58 int ofromprobe __P((struct device *, struct cfdata *, void *)); 59 void ofromattach __P((struct device *, struct device *, void *)); 60 61 CFATTACH_DECL(ofrom, sizeof(struct ofrom_softc), 62 ofromprobe, ofromattach, NULL, NULL); 63 64 extern struct cfdriver ofrom_cd; 65 66 dev_type_open(ofromopen); 67 dev_type_read(ofromrw); 68 dev_type_mmap(ofrommmap); 69 70 const struct cdevsw ofrom_cdevsw = { 71 ofromopen, nullclose, ofromrw, ofromrw, noioctl, 72 nostop, notty, nopoll, ofrommmap, nokqfilter, 73 }; 74 75 int 76 ofromprobe(parent, cf, aux) 77 struct device *parent; 78 struct cfdata *cf; 79 void *aux; 80 { 81 struct ofbus_attach_args *oba = aux; 82 static const char *const compatible_strings[] = { "rom", NULL }; 83 84 return (of_compatible(oba->oba_phandle, compatible_strings) == -1) ? 85 0 : 5; 86 } 87 88 89 void 90 ofromattach(parent, self, aux) 91 struct device *parent, *self; 92 void *aux; 93 { 94 struct ofrom_softc *sc = (struct ofrom_softc *)self; 95 struct ofbus_attach_args *oba = aux; 96 char regbuf[8]; 97 98 if (OF_getproplen(oba->oba_phandle, "reg") != 8) { 99 printf(": invalid reg property\n"); 100 return; 101 } 102 if (OF_getprop(oba->oba_phandle, "reg", regbuf, sizeof regbuf) != 8) { 103 printf(": couldn't read reg property\n"); 104 return; 105 } 106 sc->base = of_decode_int(®buf[0]); 107 sc->size = of_decode_int(®buf[4]); 108 sc->enabled = 1; 109 110 printf(": %#lx-%#lx\n", sc->base, sc->base + sc->size - 1); 111 } 112 113 int 114 ofromopen(dev, oflags, devtype, p) 115 dev_t dev; 116 int oflags, devtype; 117 struct proc *p; 118 { 119 struct ofrom_softc *sc; 120 int unit = minor(dev); 121 122 if (unit >= ofrom_cd.cd_ndevs) 123 return (ENXIO); 124 sc = ofrom_cd.cd_devs[unit]; 125 if (!sc || !sc->enabled) 126 return (ENXIO); 127 128 if (oflags & FWRITE) 129 return (EINVAL); 130 131 return (0); 132 } 133 134 int 135 ofromrw(dev, uio, flags) 136 dev_t dev; 137 struct uio *uio; 138 int flags; 139 { 140 struct ofrom_softc *sc; 141 int c, error = 0, unit = minor(dev); 142 struct iovec *iov; 143 vm_offset_t o, v; 144 extern int physlock; 145 extern char *memhook; 146 147 if (unit >= ofrom_cd.cd_ndevs) 148 return (ENXIO); /* XXX PANIC */ 149 sc = ofrom_cd.cd_devs[unit]; 150 if (!sc || !sc->enabled) 151 return (ENXIO); /* XXX PANIC */ 152 153 /* lock against other uses of shared vmmap */ 154 while (physlock > 0) { 155 physlock++; 156 error = tsleep((caddr_t)&physlock, PZERO | PCATCH, "ofromrw", 157 0); 158 if (error) 159 return (error); 160 } 161 physlock = 1; 162 163 while (uio->uio_resid > 0 && error == 0) { 164 iov = uio->uio_iov; 165 if (iov->iov_len == 0) { 166 uio->uio_iov++; 167 uio->uio_iovcnt--; 168 if (uio->uio_iovcnt < 0) 169 panic("ofromrw"); 170 continue; 171 } 172 173 /* 174 * Since everything is page aligned and no more 175 * than the rest of a page is done at once, we 176 * can just check that the offset isn't too big. 177 */ 178 if (uio->uio_offset >= sc->size) 179 break; 180 181 v = sc->base + uio->uio_offset; 182 pmap_enter(pmap_kernel(), (vm_offset_t)memhook, 183 trunc_page(v), uio->uio_rw == UIO_READ ? 184 VM_PROT_READ : VM_PROT_WRITE, PMAP_WIRED); 185 pmap_update(pmap_kernel()); 186 o = uio->uio_offset & PGOFSET; 187 c = min(uio->uio_resid, (int)(NBPG - o)); 188 error = uiomove((caddr_t)memhook + o, c, uio); 189 pmap_remove(pmap_kernel(), (vm_offset_t)memhook, 190 (vm_offset_t)memhook + NBPG); 191 pmap_update(pmap_kernel()); 192 } 193 194 if (physlock > 1) 195 wakeup((caddr_t)&physlock); 196 physlock = 0; 197 198 return (error); 199 } 200 201 paddr_t 202 ofrommmap(dev, off, prot) 203 dev_t dev; 204 off_t off; 205 int prot; 206 { 207 struct ofrom_softc *sc; 208 int unit = minor(dev); 209 210 if (unit >= ofrom_cd.cd_ndevs) 211 return (-1); /* XXX PANIC */ 212 sc = ofrom_cd.cd_devs[unit]; 213 if (!sc || !sc->enabled) 214 return (-1); /* XXX PANIC */ 215 216 if ((u_int)off >= sc->size) 217 return (-1); 218 219 return arm_btop(sc->base + off); 220 } 221