sys/arch/shark/ofw/ofrom.c

   1 /*      $NetBSD: ofrom.c,v 1.19 2009/03/14 15:36:13 dsl 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 1.19 2009/03/14 15:36:13 dsl 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
  49 #include <uvm/uvm_extern.h>
  50
  51 #include <machine/bus.h>
  52 #include <dev/ofw/openfirm.h>
  53
  54 struct ofrom_softc {
  55         struct device   sc_dev;
  56         int             enabled;
  57         paddr_t         base;
  58         paddr_t         size;
  59 };
  60
  61 int ofromprobe(struct device *, struct cfdata *, void *);
  62 void ofromattach(struct device *, struct device *, void *);
  63
  64 CFATTACH_DECL(ofrom, sizeof(struct ofrom_softc),
  65     ofromprobe, ofromattach, NULL, NULL);
  66
  67 extern struct cfdriver ofrom_cd;
  68
  69 dev_type_open(ofromopen);
  70 dev_type_read(ofromrw);
  71 dev_type_mmap(ofrommmap);
  72
  73 const struct cdevsw ofrom_cdevsw = {
  74         ofromopen, nullclose, ofromrw, ofromrw, noioctl,
  75         nostop, notty, nopoll, ofrommmap, nokqfilter,
  76 };
  77
  78 int
  79 ofromprobe(struct device *parent, struct cfdata *cf, 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(struct device *parent, struct device *self, void *aux)
  91 {
  92         struct ofrom_softc *sc = (struct ofrom_softc *)self;
  93         struct ofbus_attach_args *oba = aux;
  94         char regbuf[8];
  95
  96         if (OF_getproplen(oba->oba_phandle, "reg") != 8) {
  97                 printf(": invalid reg property\n");
  98                 return;
  99         }
 100         if (OF_getprop(oba->oba_phandle, "reg", regbuf, sizeof regbuf) != 8) {
 101                 printf(": couldn't read reg property\n");
 102                 return;
 103         }
 104         sc->base = of_decode_int(&regbuf[0]);
 105         sc->size = of_decode_int(&regbuf[4]);
 106         sc->enabled = 1;
 107
 108         printf(": %#lx-%#lx\n", sc->base, sc->base + sc->size - 1);
 109 }
 110
 111 int
 112 ofromopen(dev_t dev, int oflags, int devtype, struct lwp *l)
 113 {
 114         struct ofrom_softc *sc;
 115
 116         sc = device_lookup_private(&ofrom_cd, minor(dev));
 117         if (!sc || !sc->enabled)
 118                 return (ENXIO);
 119
 120         if (oflags & FWRITE)
 121                 return (EINVAL);
 122
 123         return (0);
 124 }
 125
 126 int
 127 ofromrw(dev_t dev, struct uio *uio, int flags)
 128 {
 129         struct ofrom_softc *sc;
 130         int c, error = 0;
 131         struct iovec *iov;
 132         paddr_t v;
 133         psize_t o;
 134         extern kmutex_t memlock;
 135         extern char *memhook;
 136
 137         sc = device_lookup_private(&ofrom_cd, minor(dev));
 138         if (!sc || !sc->enabled)
 139                 return (ENXIO);                 /* XXX PANIC */
 140
 141         /* lock against other uses of shared vmmap */
 142         mutex_enter(&memlock);
 143
 144         while (uio->uio_resid > 0 && error == 0) {
 145                 iov = uio->uio_iov;
 146                 if (iov->iov_len == 0) {
 147                         uio->uio_iov++;
 148                         uio->uio_iovcnt--;
 149                         if (uio->uio_iovcnt < 0)
 150                                 panic("ofromrw");
 151                         continue;
 152                 }
 153
 154                 /*
 155                  * Since everything is page aligned and no more
 156                  * than the rest of a page is done at once, we
 157                  * can just check that the offset isn't too big.
 158                  */
 159                 if (uio->uio_offset >= sc->size)
 160                         break;
 161
 162                 v = sc->base + uio->uio_offset;
 163                 pmap_enter(pmap_kernel(), (vaddr_t)memhook,
 164                     trunc_page(v), uio->uio_rw == UIO_READ ?
 165                     VM_PROT_READ : VM_PROT_WRITE, PMAP_WIRED);
 166                 pmap_update(pmap_kernel());
 167                 o = uio->uio_offset & PGOFSET;
 168                 c = min(uio->uio_resid, (int)(PAGE_SIZE - o));
 169                 error = uiomove((char *)memhook + o, c, uio);
 170                 pmap_remove(pmap_kernel(), (vaddr_t)memhook,
 171                     (vaddr_t)memhook + PAGE_SIZE);
 172                 pmap_update(pmap_kernel());
 173         }
 174
 175         mutex_exit(&memlock);
 176
 177         return (error);
 178 }
 179
 180 paddr_t
 181 ofrommmap(dev_t dev, off_t off, int prot)
 182 {
 183         struct ofrom_softc *sc;
 184
 185         sc = device_lookup_private(&ofrom_cd, minor(dev));
 186         if (!sc || !sc->enabled)
 187                 return (-1);                    /* XXX PANIC */
 188
 189         if ((u_int)off >= sc->size)
 190                 return (-1);
 191
 192         return arm_btop(sc->base + off);
 193 }