1 /* $NetBSD: ofrom.c,v 1.25 2014/03/16 05:20:25 dholland 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/cdefs.h> 41 __KERNEL_RCSID(0, "$NetBSD: ofrom.c,v 1.25 2014/03/16 05:20:25 dholland Exp $"); 42 43 #include <sys/param.h> 44 #include <sys/device.h> 45 #include <sys/systm.h> 46 #include <sys/conf.h> 47 #include <sys/fcntl.h> 48 #include <sys/bus.h> 49 50 #include <uvm/uvm_extern.h> 51 52 #include <dev/ofw/openfirm.h> 53 54 struct ofrom_softc { 55 int enabled; 56 paddr_t base; 57 paddr_t size; 58 }; 59 60 int ofromprobe(device_t, cfdata_t, void *); 61 void ofromattach(device_t, device_t, void *); 62 63 CFATTACH_DECL_NEW(ofrom, sizeof(struct ofrom_softc), 64 ofromprobe, ofromattach, NULL, NULL); 65 66 extern struct cfdriver ofrom_cd; 67 68 dev_type_open(ofromopen); 69 dev_type_read(ofromrw); 70 dev_type_mmap(ofrommmap); 71 72 const struct cdevsw ofrom_cdevsw = { 73 .d_open = ofromopen, 74 .d_close = nullclose, 75 .d_read = ofromrw, 76 .d_write = ofromrw, 77 .d_ioctl = noioctl, 78 .d_stop = nostop, 79 .d_tty = notty, 80 .d_poll = nopoll, 81 .d_mmap = ofrommmap, 82 .d_kqfilter = nokqfilter, 83 .d_flag = 0 84 }; 85 86 int 87 ofromprobe(device_t parent, cfdata_t cf, void *aux) 88 { 89 struct ofbus_attach_args *oba = aux; 90 static const char *const compatible_strings[] = { "rom", NULL }; 91 92 return (of_compatible(oba->oba_phandle, compatible_strings) == -1) ? 93 0 : 5; 94 } 95 96 97 void 98 ofromattach(device_t parent, device_t self, void *aux) 99 { 100 struct ofrom_softc *sc = device_private(self); 101 struct ofbus_attach_args *oba = aux; 102 char regbuf[8]; 103 104 if (OF_getproplen(oba->oba_phandle, "reg") != 8) { 105 printf(": invalid reg property\n"); 106 return; 107 } 108 if (OF_getprop(oba->oba_phandle, "reg", regbuf, sizeof regbuf) != 8) { 109 printf(": couldn't read reg property\n"); 110 return; 111 } 112 sc->base = of_decode_int(®buf[0]); 113 sc->size = of_decode_int(®buf[4]); 114 sc->enabled = 1; 115 116 printf(": %#lx-%#lx\n", sc->base, sc->base + sc->size - 1); 117 } 118 119 int 120 ofromopen(dev_t dev, int oflags, int devtype, struct lwp *l) 121 { 122 struct ofrom_softc *sc; 123 124 sc = device_lookup_private(&ofrom_cd, minor(dev)); 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_t dev, struct uio *uio, int flags) 136 { 137 pmap_t kpm = pmap_kernel(); 138 struct ofrom_softc *sc; 139 int c, error = 0; 140 struct iovec *iov; 141 paddr_t v; 142 psize_t o; 143 extern kmutex_t memlock; 144 extern char *memhook; 145 146 sc = device_lookup_private(&ofrom_cd, minor(dev)); 147 if (!sc || !sc->enabled) 148 return (ENXIO); /* XXX PANIC */ 149 150 mutex_enter(&memlock); 151 while (uio->uio_resid > 0 && error == 0) { 152 iov = uio->uio_iov; 153 if (iov->iov_len == 0) { 154 uio->uio_iov++; 155 uio->uio_iovcnt--; 156 if (uio->uio_iovcnt < 0) 157 panic("ofromrw"); 158 continue; 159 } 160 161 /* 162 * Since everything is page aligned and no more 163 * than the rest of a page is done at once, we 164 * can just check that the offset isn't too big. 165 */ 166 if (uio->uio_offset >= sc->size) 167 break; 168 169 /* XXX: Use unamanged mapping. */ 170 v = sc->base + uio->uio_offset; 171 pmap_kenter_pa((vaddr_t)memhook, trunc_page(v), 172 uio->uio_rw == UIO_READ ? VM_PROT_READ : VM_PROT_WRITE, 173 0); 174 pmap_update(kpm); 175 o = uio->uio_offset & PGOFSET; 176 c = min(uio->uio_resid, (int)(PAGE_SIZE - o)); 177 error = uiomove((char *)memhook + o, c, uio); 178 pmap_kremove((vaddr_t)memhook, (vaddr_t)memhook + PAGE_SIZE); 179 pmap_update(kpm); 180 } 181 mutex_exit(&memlock); 182 183 return (error); 184 } 185 186 paddr_t 187 ofrommmap(dev_t dev, off_t off, int prot) 188 { 189 struct ofrom_softc *sc; 190 191 sc = device_lookup_private(&ofrom_cd, minor(dev)); 192 if (!sc || !sc->enabled) 193 return (-1); /* XXX PANIC */ 194 195 if ((u_int)off >= sc->size) 196 return (-1); 197 198 return arm_btop(sc->base + off); 199 } 200