freebsd-dev/sys/dev/proto/proto_core.c
Marcel Moolenaar 67fb10f30c Add proto(4): A driver for prototyping and diagnostics.
It exposes I/O resources to user space, so that programs can peek
and poke at the hardware. It does not itself have knowledge about
the hardware device it attaches to.

Sponsored by:	Juniper Networks, Inc.
2014-04-28 17:58:40 +00:00

385 lines
8.4 KiB
C

/*-
* Copyright (c) 2014 Marcel Moolenaar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/cons.h>
#include <sys/fcntl.h>
#include <sys/interrupt.h>
#include <sys/kdb.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mman.h>
#include <sys/proc.h>
#include <sys/queue.h>
#include <sys/reboot.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <sys/uio.h>
#include <machine/resource.h>
#include <machine/stdarg.h>
#include <dev/pci/pcivar.h>
#include <dev/proto/proto.h>
#include <dev/proto/proto_dev.h>
CTASSERT(SYS_RES_IRQ != PROTO_RES_UNUSED &&
SYS_RES_MEMORY != PROTO_RES_UNUSED &&
SYS_RES_IOPORT != PROTO_RES_UNUSED);
CTASSERT(SYS_RES_IRQ != PROTO_RES_PCICFG &&
SYS_RES_MEMORY != PROTO_RES_PCICFG &&
SYS_RES_IOPORT != PROTO_RES_PCICFG);
devclass_t proto_devclass;
char proto_driver_name[] = "proto";
static d_open_t proto_open;
static d_close_t proto_close;
static d_read_t proto_read;
static d_write_t proto_write;
static d_ioctl_t proto_ioctl;
static d_mmap_t proto_mmap;
struct cdevsw proto_devsw = {
.d_version = D_VERSION,
.d_flags = 0,
.d_name = proto_driver_name,
.d_open = proto_open,
.d_close = proto_close,
.d_read = proto_read,
.d_write = proto_write,
.d_ioctl = proto_ioctl,
.d_mmap = proto_mmap,
};
static MALLOC_DEFINE(M_PROTO, "PROTO", "PROTO driver");
int
proto_add_resource(struct proto_softc *sc, int type, int rid,
struct resource *res)
{
struct proto_res *r;
if (type == PROTO_RES_UNUSED)
return (EINVAL);
if (sc->sc_rescnt == PROTO_RES_MAX)
return (ENOSPC);
r = sc->sc_res + sc->sc_rescnt++;
r->r_type = type;
r->r_rid = rid;
r->r_res = res;
return (0);
}
#ifdef notyet
static int
proto_intr(void *arg)
{
struct proto_softc *sc = arg;
/* XXX TODO */
return (FILTER_HANDLED);
}
#endif
int
proto_attach(device_t dev)
{
struct proto_softc *sc;
struct proto_res *r;
u_int res;
sc = device_get_softc(dev);
sc->sc_dev = dev;
for (res = 0; res < sc->sc_rescnt; res++) {
r = sc->sc_res + res;
switch (r->r_type) {
case SYS_RES_IRQ:
/* XXX TODO */
break;
case SYS_RES_MEMORY:
case SYS_RES_IOPORT:
r->r_size = rman_get_size(r->r_res);
r->r_u.cdev = make_dev(&proto_devsw, res, 0, 0, 0666,
"proto/%s/%02x.%s", device_get_desc(dev), r->r_rid,
(r->r_type == SYS_RES_IOPORT) ? "io" : "mem");
r->r_u.cdev->si_drv1 = sc;
r->r_u.cdev->si_drv2 = r;
break;
case PROTO_RES_PCICFG:
r->r_size = 4096;
r->r_u.cdev = make_dev(&proto_devsw, res, 0, 0, 0666,
"proto/%s/pcicfg", device_get_desc(dev));
r->r_u.cdev->si_drv1 = sc;
r->r_u.cdev->si_drv2 = r;
break;
}
}
return (0);
}
int
proto_detach(device_t dev)
{
struct proto_softc *sc;
struct proto_res *r;
u_int res;
sc = device_get_softc(dev);
/* Don't detach if we have open device filess. */
for (res = 0; res < sc->sc_rescnt; res++) {
r = sc->sc_res + res;
if (r->r_opened)
return (EBUSY);
}
for (res = 0; res < sc->sc_rescnt; res++) {
r = sc->sc_res + res;
switch (r->r_type) {
case SYS_RES_IRQ:
/* XXX TODO */
break;
case SYS_RES_MEMORY:
case SYS_RES_IOPORT:
case PROTO_RES_PCICFG:
destroy_dev(r->r_u.cdev);
break;
}
if (r->r_res != NULL) {
bus_release_resource(dev, r->r_type, r->r_rid,
r->r_res);
r->r_res = NULL;
}
r->r_type = PROTO_RES_UNUSED;
}
sc->sc_rescnt = 0;
return (0);
}
/*
* Device functions
*/
static int
proto_open(struct cdev *cdev, int oflags, int devtype, struct thread *td)
{
struct proto_res *r;
r = cdev->si_drv2;
if (!atomic_cmpset_acq_ptr(&r->r_opened, 0UL, (uintptr_t)td->td_proc))
return (EBUSY);
return (0);
}
static int
proto_close(struct cdev *cdev, int fflag, int devtype, struct thread *td)
{
struct proto_res *r;
r = cdev->si_drv2;
if (!atomic_cmpset_acq_ptr(&r->r_opened, (uintptr_t)td->td_proc, 0UL))
return (ENXIO);
return (0);
}
static int
proto_read(struct cdev *cdev, struct uio *uio, int ioflag)
{
union {
uint8_t x1[8];
uint16_t x2[4];
uint32_t x4[2];
uint64_t x8[1];
} buf;
struct proto_softc *sc;
struct proto_res *r;
device_t dev;
off_t ofs;
u_long width;
int error;
sc = cdev->si_drv1;
dev = sc->sc_dev;
r = cdev->si_drv2;
width = uio->uio_resid;
if (width < 1 || width > 8 || bitcount16(width) > 1)
return (EIO);
ofs = uio->uio_offset;
if (ofs + width > r->r_size)
return (EIO);
switch (width) {
case 1:
buf.x1[0] = (r->r_type == PROTO_RES_PCICFG) ?
pci_read_config(dev, ofs, 1) : bus_read_1(r->r_res, ofs);
break;
case 2:
buf.x2[0] = (r->r_type == PROTO_RES_PCICFG) ?
pci_read_config(dev, ofs, 2) : bus_read_2(r->r_res, ofs);
break;
case 4:
buf.x4[0] = (r->r_type == PROTO_RES_PCICFG) ?
pci_read_config(dev, ofs, 4) : bus_read_4(r->r_res, ofs);
break;
#ifndef __i386__
case 8:
if (r->r_type == PROTO_RES_PCICFG)
return (EINVAL);
buf.x8[0] = bus_read_8(r->r_res, ofs);
break;
#endif
default:
return (EIO);
}
error = uiomove(&buf, width, uio);
return (error);
}
static int
proto_write(struct cdev *cdev, struct uio *uio, int ioflag)
{
union {
uint8_t x1[8];
uint16_t x2[4];
uint32_t x4[2];
uint64_t x8[1];
} buf;
struct proto_softc *sc;
struct proto_res *r;
device_t dev;
off_t ofs;
u_long width;
int error;
sc = cdev->si_drv1;
dev = sc->sc_dev;
r = cdev->si_drv2;
width = uio->uio_resid;
if (width < 1 || width > 8 || bitcount16(width) > 1)
return (EIO);
ofs = uio->uio_offset;
if (ofs + width > r->r_size)
return (EIO);
error = uiomove(&buf, width, uio);
if (error)
return (error);
switch (width) {
case 1:
if (r->r_type == PROTO_RES_PCICFG)
pci_write_config(dev, ofs, buf.x1[0], 1);
else
bus_write_1(r->r_res, ofs, buf.x1[0]);
break;
case 2:
if (r->r_type == PROTO_RES_PCICFG)
pci_write_config(dev, ofs, buf.x2[0], 2);
else
bus_write_2(r->r_res, ofs, buf.x2[0]);
break;
case 4:
if (r->r_type == PROTO_RES_PCICFG)
pci_write_config(dev, ofs, buf.x4[0], 4);
else
bus_write_4(r->r_res, ofs, buf.x4[0]);
break;
#ifndef __i386__
case 8:
if (r->r_type == PROTO_RES_PCICFG)
return (EINVAL);
bus_write_8(r->r_res, ofs, buf.x8[0]);
break;
#endif
default:
return (EIO);
}
return (0);
}
static int
proto_ioctl(struct cdev *cdev, u_long cmd, caddr_t data, int fflag,
struct thread *td)
{
struct proto_ioc_region *region;
struct proto_res *r;
int error;
r = cdev->si_drv2;
error = 0;
switch (cmd) {
case PROTO_IOC_REGION:
region = (struct proto_ioc_region *)data;
region->size = r->r_size;
if (r->r_type == PROTO_RES_PCICFG)
region->address = 0;
else
region->address = rman_get_start(r->r_res);
break;
default:
error = ENOIOCTL;
break;
}
return (error);
}
static int
proto_mmap(struct cdev *cdev, vm_ooffset_t offset, vm_paddr_t *paddr,
int prot, vm_memattr_t *memattr)
{
struct proto_res *r;
r = cdev->si_drv2;
if (r->r_type != SYS_RES_MEMORY)
return (ENXIO);
if (offset & PAGE_MASK)
return (EINVAL);
if (prot & PROT_EXEC)
return (EACCES);
if (offset >= r->r_size)
return (EINVAL);
*paddr = rman_get_start(r->r_res) + offset;
#ifndef __sparc64__
*memattr = VM_MEMATTR_UNCACHEABLE;
#endif
return (0);
}