NetBSD/sys/arch/arm32/ofw/ofrom.c

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/* $NetBSD: ofrom.c,v 1.3 1998/05/01 21:18:43 cgd Exp $ */
/*
* Copyright 1998
* Digital Equipment Corporation. All rights reserved.
*
* This software is furnished under license and may be used and
* copied only in accordance with the following terms and conditions.
* Subject to these conditions, you may download, copy, install,
* use, modify and distribute this software in source and/or binary
* form. No title or ownership is transferred hereby.
*
* 1) Any source code used, modified or distributed must reproduce
* and retain this copyright notice and list of conditions as
* they appear in the source file.
*
* 2) No right is granted to use any trade name, trademark, or logo of
* Digital Equipment Corporation. Neither the "Digital Equipment
* Corporation" name nor any trademark or logo of Digital Equipment
* Corporation may be used to endorse or promote products derived
* from this software without the prior written permission of
* Digital Equipment Corporation.
*
* 3) This software is provided "AS-IS" and any express or implied
* warranties, including but not limited to, any implied warranties
* of merchantability, fitness for a particular purpose, or
* non-infringement are disclaimed. In no event shall DIGITAL be
* liable for any damages whatsoever, and in particular, DIGITAL
* shall not be liable for special, indirect, consequential, or
* incidental damages or damages for lost profits, loss of
* revenue or loss of use, whether such damages arise in contract,
* negligence, tort, under statute, in equity, at law or otherwise,
* even if advised of the possibility of such damage.
*/
/*
* XXX open for writing (for user programs to mmap, and write contents)
*/
#include <sys/param.h>
#include <sys/device.h>
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#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/fcntl.h>
#include <vm/vm.h>
#include <machine/bus.h>
#include <dev/ofw/openfirm.h>
struct ofrom_softc {
struct device sc_dev;
int enabled;
vm_offset_t base;
vm_size_t size;
};
int ofromprobe __P((struct device *, struct cfdata *, void *));
void ofromattach __P((struct device *, struct device *, void *));
struct cfattach ofrom_ca = {
sizeof(struct ofrom_softc), ofromprobe, ofromattach
};
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extern struct cfdriver ofrom_cd;
cdev_decl(ofrom);
int
ofromprobe(parent, cf, aux)
struct device *parent;
struct cfdata *cf;
void *aux;
{
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struct ofbus_attach_args *oba = aux;
const char *compatible_strings[] = { "rom", NULL };
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return (of_compatible(oba->oba_phandle, compatible_strings) == -1) ?
0 : 5;
}
void
ofromattach(parent, self, aux)
struct device *parent, *self;
void *aux;
{
struct ofrom_softc *sc = (struct ofrom_softc *)self;
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struct ofbus_attach_args *oba = aux;
char regbuf[8];
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if (OF_getproplen(oba->oba_phandle, "reg") != 8) {
printf(": invalid reg property\n");
return;
}
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if (OF_getprop(oba->oba_phandle, "reg", regbuf, sizeof regbuf) != 8) {
printf(": couldn't read reg property\n");
return;
}
sc->base = of_decode_int(&regbuf[0]);
sc->size = of_decode_int(&regbuf[4]);
sc->enabled = 1;
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printf(": %#lx-%#lx\n", sc->base, sc->base + sc->size - 1);
}
int
ofromopen(dev, oflags, devtype, p)
dev_t dev;
int oflags, devtype;
struct proc *p;
{
struct ofrom_softc *sc;
int unit = minor(dev);
if (unit >= ofrom_cd.cd_ndevs)
return (ENXIO);
sc = ofrom_cd.cd_devs[unit];
if (!sc || !sc->enabled)
return (ENXIO);
if (oflags & FWRITE)
return (EINVAL);
return (0);
}
int
ofromclose(dev, fflag, devtype, p)
dev_t dev;
int fflag, devtype;
struct proc *p;
{
return (0);
}
int
ofromrw(dev, uio, flags)
dev_t dev;
struct uio *uio;
int flags;
{
struct ofrom_softc *sc;
int c, error = 0, unit = minor(dev);
struct iovec *iov;
vm_offset_t o, v;
extern int physlock;
extern char *memhook;
if (unit >= ofrom_cd.cd_ndevs)
return (ENXIO); /* XXX PANIC */
sc = ofrom_cd.cd_devs[unit];
if (!sc || !sc->enabled)
return (ENXIO); /* XXX PANIC */
/* lock against other uses of shared vmmap */
while (physlock > 0) {
physlock++;
error = tsleep((caddr_t)&physlock, PZERO | PCATCH, "ofromrw",
0);
if (error)
return (error);
}
physlock = 1;
while (uio->uio_resid > 0 && error == 0) {
iov = uio->uio_iov;
if (iov->iov_len == 0) {
uio->uio_iov++;
uio->uio_iovcnt--;
if (uio->uio_iovcnt < 0)
panic("ofromrw");
continue;
}
/*
* Since everything is page aligned and no more
* than the rest of a page is done at once, we
* can just check that the offset isn't too big.
*/
if (uio->uio_offset >= sc->size)
break;
v = sc->base + uio->uio_offset;
pmap_enter(pmap_kernel(), (vm_offset_t)memhook,
trunc_page(v), uio->uio_rw == UIO_READ ?
VM_PROT_READ : VM_PROT_WRITE, TRUE);
o = uio->uio_offset & PGOFSET;
c = min(uio->uio_resid, (int)(NBPG - o));
error = uiomove((caddr_t)memhook + o, c, uio);
pmap_remove(pmap_kernel(), (vm_offset_t)memhook,
(vm_offset_t)memhook + NBPG);
}
if (physlock > 1)
wakeup((caddr_t)&physlock);
physlock = 0;
return (error);
}
int
ofrommmap(dev, off, prot)
dev_t dev;
int off, prot;
{
struct ofrom_softc *sc;
int unit = minor(dev);
if (unit >= ofrom_cd.cd_ndevs)
return (-1); /* XXX PANIC */
sc = ofrom_cd.cd_devs[unit];
if (!sc || !sc->enabled)
return (-1); /* XXX PANIC */
if (off >= sc->size)
return (-1);
return arm_byte_to_page(sc->base + off);
}