278 lines
7.3 KiB
C
278 lines
7.3 KiB
C
/*-
|
|
* Copyright (c) 2006 Warner Losh. 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("$FreeBSD$");
|
|
/*
|
|
* Generic IIC eeprom support, modeled after the AT24C family of products.
|
|
*/
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/bus.h>
|
|
#include <sys/conf.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/module.h>
|
|
#include <sys/resource.h>
|
|
#include <sys/sx.h>
|
|
#include <sys/uio.h>
|
|
#include <machine/bus.h>
|
|
#include <dev/iicbus/iiconf.h>
|
|
#include <dev/iicbus/iicbus.h>
|
|
|
|
#include "iicbus_if.h"
|
|
|
|
#define IIC_M_WR 0 /* write operation */
|
|
#define MAX_RD_SZ 256 /* Largest read size we support */
|
|
#define MAX_WR_SZ 256 /* Largest write size we support */
|
|
|
|
struct icee_softc {
|
|
device_t sc_dev; /* Myself */
|
|
struct sx sc_lock; /* basically a perimeter lock */
|
|
struct cdev *cdev; /* user interface */
|
|
int addr;
|
|
int size; /* How big am I? */
|
|
int type; /* What type 8 or 16 bit? */
|
|
int rd_sz; /* What's the read page size */
|
|
int wr_sz; /* What's the write page size */
|
|
};
|
|
|
|
#define ICEE_LOCK(_sc) sx_xlock(&(_sc)->sc_lock)
|
|
#define ICEE_UNLOCK(_sc) sx_xunlock(&(_sc)->sc_lock)
|
|
#define ICEE_LOCK_INIT(_sc) sx_init(&_sc->sc_lock, "icee")
|
|
#define ICEE_LOCK_DESTROY(_sc) sx_destroy(&_sc->sc_lock);
|
|
#define ICEE_ASSERT_LOCKED(_sc) sx_assert(&_sc->sc_lock, SA_XLOCKED);
|
|
#define ICEE_ASSERT_UNLOCKED(_sc) sx_assert(&_sc->sc_lock, SA_UNLOCKED);
|
|
#define CDEV2SOFTC(dev) ((dev)->si_drv1)
|
|
|
|
/* cdev routines */
|
|
static d_open_t icee_open;
|
|
static d_close_t icee_close;
|
|
static d_read_t icee_read;
|
|
static d_write_t icee_write;
|
|
|
|
static struct cdevsw icee_cdevsw =
|
|
{
|
|
.d_version = D_VERSION,
|
|
.d_flags = D_TRACKCLOSE,
|
|
.d_open = icee_open,
|
|
.d_close = icee_close,
|
|
.d_read = icee_read,
|
|
.d_write = icee_write
|
|
};
|
|
|
|
static int
|
|
icee_probe(device_t dev)
|
|
{
|
|
/* XXX really probe? -- not until we know the size... */
|
|
device_set_desc(dev, "I2C EEPROM");
|
|
return (BUS_PROBE_NOWILDCARD);
|
|
}
|
|
|
|
static int
|
|
icee_attach(device_t dev)
|
|
{
|
|
struct icee_softc *sc = device_get_softc(dev);
|
|
const char *dname;
|
|
int dunit, err;
|
|
|
|
sc->sc_dev = dev;
|
|
sc->addr = iicbus_get_addr(dev);
|
|
err = 0;
|
|
dname = device_get_name(dev);
|
|
dunit = device_get_unit(dev);
|
|
resource_int_value(dname, dunit, "size", &sc->size);
|
|
resource_int_value(dname, dunit, "type", &sc->type);
|
|
resource_int_value(dname, dunit, "rd_sz", &sc->rd_sz);
|
|
if (sc->rd_sz > MAX_RD_SZ)
|
|
sc->rd_sz = MAX_RD_SZ;
|
|
resource_int_value(dname, dunit, "wr_sz", &sc->wr_sz);
|
|
if (bootverbose)
|
|
device_printf(dev, "size: %d bytes bus_width: %d-bits\n",
|
|
sc->size, sc->type);
|
|
sc->cdev = make_dev(&icee_cdevsw, device_get_unit(dev), UID_ROOT,
|
|
GID_WHEEL, 0600, "icee%d", device_get_unit(dev));
|
|
if (sc->cdev == NULL) {
|
|
err = ENOMEM;
|
|
goto out;
|
|
}
|
|
sc->cdev->si_drv1 = sc;
|
|
ICEE_LOCK_INIT(sc);
|
|
out:;
|
|
return (err);
|
|
}
|
|
|
|
static int
|
|
icee_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
icee_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
icee_read(struct cdev *dev, struct uio *uio, int ioflag)
|
|
{
|
|
struct icee_softc *sc;
|
|
uint8_t addr[2];
|
|
uint8_t data[MAX_RD_SZ];
|
|
int error, i, len, slave;
|
|
struct iic_msg msgs[2] = {
|
|
{ 0, IIC_M_WR, 1, addr },
|
|
{ 0, IIC_M_RD, 0, data },
|
|
};
|
|
|
|
sc = CDEV2SOFTC(dev);
|
|
if (uio->uio_offset == sc->size)
|
|
return (0);
|
|
if (uio->uio_offset > sc->size)
|
|
return (EIO);
|
|
if (sc->type != 8 && sc->type != 16)
|
|
return (EINVAL);
|
|
ICEE_LOCK(sc);
|
|
slave = error = 0;
|
|
while (uio->uio_resid > 0) {
|
|
if (uio->uio_offset >= sc->size)
|
|
break;
|
|
len = MIN(sc->rd_sz - (uio->uio_offset & (sc->rd_sz - 1)),
|
|
uio->uio_resid);
|
|
switch (sc->type) {
|
|
case 8:
|
|
slave = (uio->uio_offset >> 7) | sc->addr;
|
|
msgs[0].len = 1;
|
|
msgs[1].len = len;
|
|
addr[0] = uio->uio_offset & 0xff;
|
|
break;
|
|
case 16:
|
|
slave = sc->addr | (uio->uio_offset >> 15);
|
|
msgs[0].len = 2;
|
|
msgs[1].len = len;
|
|
addr[0] = (uio->uio_offset >> 8) & 0xff;
|
|
addr[1] = uio->uio_offset & 0xff;
|
|
break;
|
|
}
|
|
for (i = 0; i < 2; i++)
|
|
msgs[i].slave = slave;
|
|
error = iicbus_transfer(sc->sc_dev, msgs, 2);
|
|
if (error)
|
|
break;
|
|
error = uiomove(data, len, uio);
|
|
if (error)
|
|
break;
|
|
}
|
|
ICEE_UNLOCK(sc);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Write to the part. We use three transfers here since we're actually
|
|
* doing a write followed by a read to make sure that the write finished.
|
|
* It is easier to encode the dummy read here than to break things up
|
|
* into smaller chunks...
|
|
*/
|
|
static int
|
|
icee_write(struct cdev *dev, struct uio *uio, int ioflag)
|
|
{
|
|
struct icee_softc *sc;
|
|
int error, len, slave, waitlimit;
|
|
uint8_t data[MAX_WR_SZ + 2];
|
|
struct iic_msg wr[1] = {
|
|
{ 0, IIC_M_WR, 0, data },
|
|
};
|
|
struct iic_msg rd[1] = {
|
|
{ 0, IIC_M_RD, 1, data },
|
|
};
|
|
|
|
sc = CDEV2SOFTC(dev);
|
|
if (uio->uio_offset >= sc->size)
|
|
return (EIO);
|
|
if (sc->type != 8 && sc->type != 16)
|
|
return (EINVAL);
|
|
ICEE_LOCK(sc);
|
|
slave = error = 0;
|
|
while (uio->uio_resid > 0) {
|
|
if (uio->uio_offset >= sc->size)
|
|
break;
|
|
len = MIN(sc->wr_sz - (uio->uio_offset & (sc->wr_sz - 1)),
|
|
uio->uio_resid);
|
|
switch (sc->type) {
|
|
case 8:
|
|
slave = (uio->uio_offset >> 7) | sc->addr;
|
|
wr[0].len = 1 + len;
|
|
data[0] = uio->uio_offset & 0xff;
|
|
break;
|
|
case 16:
|
|
slave = sc->addr | (uio->uio_offset >> 15);
|
|
wr[0].len = 2 + len;
|
|
data[0] = (uio->uio_offset >> 8) & 0xff;
|
|
data[1] = uio->uio_offset & 0xff;
|
|
break;
|
|
}
|
|
wr[0].slave = slave;
|
|
error = uiomove(data + sc->type / 8, len, uio);
|
|
if (error)
|
|
break;
|
|
error = iicbus_transfer(sc->sc_dev, wr, 1);
|
|
if (error)
|
|
break;
|
|
// Now wait for the write to be done by trying to read
|
|
// the part.
|
|
waitlimit = 10000;
|
|
rd[0].slave = slave;
|
|
do
|
|
{
|
|
error = iicbus_transfer(sc->sc_dev, rd, 1);
|
|
} while (waitlimit-- > 0 && error != 0);
|
|
if (error) {
|
|
printf("waiting for write failed %d\n", error);
|
|
break;
|
|
}
|
|
}
|
|
ICEE_UNLOCK(sc);
|
|
return error;
|
|
}
|
|
|
|
static device_method_t icee_methods[] = {
|
|
DEVMETHOD(device_probe, icee_probe),
|
|
DEVMETHOD(device_attach, icee_attach),
|
|
|
|
DEVMETHOD_END
|
|
};
|
|
|
|
static driver_t icee_driver = {
|
|
"icee",
|
|
icee_methods,
|
|
sizeof(struct icee_softc),
|
|
};
|
|
static devclass_t icee_devclass;
|
|
|
|
DRIVER_MODULE(icee, iicbus, icee_driver, icee_devclass, 0, 0);
|
|
MODULE_VERSION(icee, 1);
|
|
MODULE_DEPEND(icee, iicbus, 1, 1, 1);
|