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/*-
* Copyright (c) 2000-2004
* Diomidis D. Spinellis, Athens, Greece
* 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 as
* the first lines of this file unmodified.
* 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 Diomidis D. Spinellis ``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 Diomidis D. Spinellis 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.
*
* $Id: pbio.c,v 1.12 2003/10/11 13:05:08 dds Exp dds $
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/dev/pbio/pbio.c 183397 2008-09-27 08:51:18Z ed $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h> /* SYSINIT stuff */
#include <sys/bus.h>
#include <sys/resource.h>
#include <sys/syslog.h>
#include <sys/sysctl.h>
#include <sys/conf.h> /* cdevsw stuff */
#include <sys/malloc.h> /* malloc region definitions */
#include <sys/module.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/rman.h>
#include <dev/pbio/pbioio.h> /* pbio IOCTL definitions */
#include <sys/uio.h>
#include <sys/fcntl.h>
#include <isa/isavar.h>
/* Function prototypes (these should all be static) */
static d_open_t pbioopen;
static d_close_t pbioclose;
static d_read_t pbioread;
static d_write_t pbiowrite;
static d_ioctl_t pbioioctl;
static d_poll_t pbiopoll;
static int pbioprobe(device_t);
static int pbioattach(device_t);
/* Device registers */
#define PBIO_PORTA 0
#define PBIO_PORTB 1
#define PBIO_PORTC 2
#define PBIO_CFG 3
#define PBIO_IOSIZE 4
/* Per-port buffer size */
#define PBIO_BUFSIZ 64
/* Number of /dev entries */
#define PBIO_NPORTS 4
/* I/O port range */
#define IO_PBIOSIZE 4
static char *port_names[] = {"a", "b", "ch", "cl"};
#define PBIO_PNAME(n) (port_names[(n)])
#define UNIT(dev) (dev2unit(dev) >> 2)
#define PORT(dev) (dev2unit(dev) & 0x3)
#define PBIOPRI ((PZERO + 5) | PCATCH)
static struct cdevsw pbio_cdevsw = {
.d_version = D_VERSION,
.d_flags = D_NEEDGIANT,
.d_open = pbioopen,
.d_close = pbioclose,
.d_read = pbioread,
.d_write = pbiowrite,
.d_ioctl = pbioioctl,
.d_poll = pbiopoll,
.d_name = "pbio"
};
/*
* Data specific to each I/O port
*/
struct portdata {
struct cdev *port;
int diff; /* When true read only differences */
int ipace; /* Input pace */
int opace; /* Output pace */
char oldval; /* Last value read */
char buff[PBIO_BUFSIZ]; /* Per-port data buffer */
};
/*
* One of these per allocated device
*/
struct pbio_softc {
struct portdata pd[PBIO_NPORTS];/* Per port data */
int iomode; /* Virtualized I/O mode port value */
/* The real port is write-only */
struct resource *res;
bus_space_tag_t bst;
bus_space_handle_t bsh;
};
typedef struct pbio_softc *sc_p;
static device_method_t pbio_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, pbioprobe),
DEVMETHOD(device_attach, pbioattach),
{ 0, 0 }
};
static devclass_t pbio_devclass;
#define pbio_addr(unit) \
((struct pbio_softc *) devclass_get_softc(pbio_devclass, unit))
static char driver_name[] = "pbio";
static driver_t pbio_driver = {
driver_name,
pbio_methods,
sizeof(struct pbio_softc),
};
DRIVER_MODULE(pbio, isa, pbio_driver, pbio_devclass, 0, 0);
static __inline uint8_t
pbinb(struct pbio_softc *scp, int off)
{
return bus_space_read_1(scp->bst, scp->bsh, off);
}
static __inline void
pboutb(struct pbio_softc *scp, int off, uint8_t val)
{
bus_space_write_1(scp->bst, scp->bsh, off, val);
}
static int
pbioprobe(device_t dev)
{
int rid;
struct pbio_softc *scp = device_get_softc(dev);
#ifdef GENERIC_PBIO_PROBE
unsigned char val;
#endif
if (isa_get_logicalid(dev)) /* skip PnP probes */
return (ENXIO);
rid = 0;
scp->res = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid,
0, ~0, IO_PBIOSIZE, RF_ACTIVE);
if (scp->res == NULL)
return (ENXIO);
#ifdef GENERIC_PBIO_PROBE
scp->bst = rman_get_bustag(scp->res);
scp->bsh = rman_get_bushandle(scp->res);
/*
* try see if the device is there.
* This probe works only if the device has no I/O attached to it
* XXX Better allow flags to abort testing
*/
/* Set all ports to output */
pboutb(scp, PBIO_CFG, 0x80);
printf("pbio val(CFG: 0x%03x)=0x%02x (should be 0x80)\n",
rman_get_start(scp->res), pbinb(scp, PBIO_CFG));
pboutb(scp, PBIO_PORTA, 0xa5);
val = pbinb(scp, PBIO_PORTA);
printf("pbio val=0x%02x (should be 0xa5)\n", val);
if (val != 0xa5) {
bus_release_resource(dev, SYS_RES_IOPORT, rid, sc->res);
return (ENXIO);
}
pboutb(scp, PBIO_PORTA, 0x5a);
val = pbinb(scp, PBIO_PORTA);
printf("pbio val=0x%02x (should be 0x5a)\n", val);
if (val != 0x5a) {
bus_release_resource(dev, SYS_RES_IOPORT, rid, sc->res);
return (ENXIO);
}
#endif
device_set_desc(dev, "Intel 8255 PPI (basic mode)");
/* Set all ports to input */
/* pboutb(scp, PBIO_CFG, 0x9b); */
bus_release_resource(dev, SYS_RES_IOPORT, rid, scp->res);
return (0);
}
/*
* Called if the probe succeeded.
* We can be destructive here as we know we have the device.
* we can also trust the unit number.
*/
static int
pbioattach (device_t dev)
{
int unit;
int i;
int rid;
struct pbio_softc *sc;
sc = device_get_softc(dev);
unit = device_get_unit(dev);
rid = 0;
sc->res = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid,
0, ~0, IO_PBIOSIZE, RF_ACTIVE);
if (sc->res == NULL)
return (ENXIO);
sc->bst = rman_get_bustag(sc->res);
sc->bsh = rman_get_bushandle(sc->res);
/*
* Store whatever seems wise.
*/
sc->iomode = 0x9b; /* All ports to input */
for (i = 0; i < PBIO_NPORTS; i++)
sc->pd[i].port = make_dev(&pbio_cdevsw, (unit << 2) + i, 0, 0,
0600, "pbio%d%s", unit, PBIO_PNAME(i));
return (0);
}
static int
pbioioctl (struct cdev *dev, u_long cmd, caddr_t data, int flag,
struct thread *td)
{
struct pbio_softc *scp;
int port, unit;
unit = UNIT(dev);
port = PORT(dev);
scp = pbio_addr(unit);
if (scp == NULL)
return (ENODEV);
switch (cmd) {
case PBIO_SETDIFF:
scp->pd[port].diff = *(int *)data;
break;
case PBIO_SETIPACE:
scp->pd[port].ipace = *(int *)data;
break;
case PBIO_SETOPACE:
scp->pd[port].opace = *(int *)data;
break;
case PBIO_GETDIFF:
*(int *)data = scp->pd[port].diff;
break;
case PBIO_GETIPACE:
*(int *)data = scp->pd[port].ipace;
break;
case PBIO_GETOPACE:
*(int *)data = scp->pd[port].opace;
break;
default:
return ENXIO;
}
return (0);
}
static int
pbioopen(struct cdev *dev, int oflags, int devtype, struct thread *td)
{
struct pbio_softc *scp;
int ocfg, port, unit;
int portbit; /* Port configuration bit */
unit = UNIT(dev);
port = PORT(dev);
scp = pbio_addr(unit);
if (scp == NULL)
return (ENODEV);
switch (port) {
case 0: portbit = 0x10; break; /* Port A */
case 1: portbit = 0x02; break; /* Port B */
case 2: portbit = 0x08; break; /* Port CH */
case 3: portbit = 0x01; break; /* Port CL */
default: return (ENODEV);
}
ocfg = scp->iomode;
if (oflags & FWRITE)
/* Writing == output; zero the bit */
pboutb(scp, PBIO_CFG, scp->iomode = (ocfg & (~portbit)));
else if (oflags & FREAD)
/* Reading == input; set the bit */
pboutb(scp, PBIO_CFG, scp->iomode = (ocfg | portbit));
else
return (EACCES);
return (0);
}
static int
pbioclose(struct cdev *dev, int fflag, int devtype, struct thread *td)
{
struct pbio_softc *scp;
int unit;
unit = UNIT(dev);
scp = pbio_addr(unit);
if (scp == NULL)
return (ENODEV);
return (0);
}
/*
* Return the value of a given port on a given I/O base address
* Handles the split C port nibbles and blocking
*/
static int
portval(int port, struct pbio_softc *scp, char *val)
{
int err;
for (;;) {
switch (port) {
case 0:
*val = pbinb(scp, PBIO_PORTA);
break;
case 1:
*val = pbinb(scp, PBIO_PORTB);
break;
case 2:
*val = (pbinb(scp, PBIO_PORTC) >> 4) & 0xf;
break;
case 3:
*val = pbinb(scp, PBIO_PORTC) & 0xf;
break;
default:
*val = 0;
break;
}
if (scp->pd[port].diff) {
if (*val != scp->pd[port].oldval) {
scp->pd[port].oldval = *val;
return (0);
}
err = tsleep((caddr_t)&(scp->pd[port].diff), PBIOPRI,
"pbiopl", max(1, scp->pd[port].ipace));
if (err == EINTR)
return (EINTR);
} else
return (0);
}
}
static int
pbioread(struct cdev *dev, struct uio *uio, int ioflag)
{
struct pbio_softc *scp;
int err, i, port, ret, toread, unit;
char val;
unit = UNIT(dev);
port = PORT(dev);
scp = pbio_addr(unit);
if (scp == NULL)
return (ENODEV);
while (uio->uio_resid > 0) {
toread = min(uio->uio_resid, PBIO_BUFSIZ);
if ((ret = uiomove(scp->pd[port].buff, toread, uio)) != 0)
return (ret);
for (i = 0; i < toread; i++) {
if ((err = portval(port, scp, &val)) != 0)
return (err);
scp->pd[port].buff[i] = val;
if (!scp->pd[port].diff && scp->pd[port].ipace)
tsleep((caddr_t)&(scp->pd[port].ipace), PBIOPRI,
"pbioip", scp->pd[port].ipace);
}
}
return 0;
}
static int
pbiowrite(struct cdev *dev, struct uio *uio, int ioflag)
{
struct pbio_softc *scp;
int i, port, ret, towrite, unit;
char val, oval;
unit = UNIT(dev);
port = PORT(dev);
scp = pbio_addr(unit);
if (scp == NULL)
return (ENODEV);
while (uio->uio_resid > 0) {
towrite = min(uio->uio_resid, PBIO_BUFSIZ);
if ((ret = uiomove(scp->pd[port].buff, towrite, uio)) != 0)
return (ret);
for (i = 0; i < towrite; i++) {
val = scp->pd[port].buff[i];
switch (port) {
case 0:
pboutb(scp, PBIO_PORTA, val);
break;
case 1:
pboutb(scp, PBIO_PORTB, val);
break;
case 2:
oval = pbinb(scp, PBIO_PORTC);
oval &= 0xf;
val <<= 4;
pboutb(scp, PBIO_PORTC, val | oval);
break;
case 3:
oval = pbinb(scp, PBIO_PORTC);
oval &= 0xf0;
val &= 0xf;
pboutb(scp, PBIO_PORTC, oval | val);
break;
}
if (scp->pd[port].opace)
tsleep((caddr_t)&(scp->pd[port].opace),
PBIOPRI, "pbioop",
scp->pd[port].opace);
}
}
return (0);
}
static int
pbiopoll(struct cdev *dev, int which, struct thread *td)
{
struct pbio_softc *scp;
int unit;
unit = UNIT(dev);
scp = pbio_addr(unit);
if (scp == NULL)
return (ENODEV);
/*
* Do processing
*/
return (0); /* this is the wrong value I'm sure */
}