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freebsd/sys/dev/bktr/bktr_i2c.c
John Baldwin 13e3657b7b Add locking to the various iicbus(4) bridge drivers: 
- Just grab Giant in the ixp425_iic(4) driver since this driver uses
  a shared address/data register window pair to access the actual
  I2C registers.  None of the other ixp425 drivers lock access to these
  shared address/data registers yet and that would need to be done before
  this could use any meaningful locking.
- Add locking to the interrupt handler and 'iicbus_reset' methods of the
  at91_twi(4) driver.
- Add locking to the pcf(4) driver.  Other pcf(4) fixes include:
  - Don't needlessly zero the softc.
  - Use bus_foo rather than bus_space_foo and remove bus space tag and
    handle from softc.
- The lpbb(4) driver just grabs Giant for now.  This will be refined later
  when ppbus(4) is locked.
- As was done with smbus earlier, move the DRIVER_MODULE() lines to match
  the bus driver (either iicbus or iicbb) to the bridge driver into the
  bridge drivers.

Tested by:	sam (arm/ixp425)
2008-08-04 20:46:15 +00:00

363 lines
8.4 KiB
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/*-
* Copyright (c) 1998, 2001 Nicolas Souchu
* 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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("$FreeBSD$");
/*
* I2C support for the bti2c chipset.
*
* From brooktree848.c <fsmp@freefall.org>
*/
#include "opt_bktr.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/systm.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/uio.h>
#if __FreeBSD_version < 500014
#include <sys/select.h>
#else
#include <sys/selinfo.h>
#endif
#if (__FreeBSD_version < 500000)
#include <pci/pcivar.h>
#include <pci/pcireg.h>
#else
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#endif
#include <machine/bus.h>
#include <sys/bus.h>
#include <dev/bktr/ioctl_meteor.h>
#include <dev/bktr/ioctl_bt848.h> /* extensions to ioctl_meteor.h */
#include <dev/bktr/bktr_reg.h>
#include <dev/bktr/bktr_i2c.h>
#include <dev/smbus/smbconf.h>
#include <dev/iicbus/iiconf.h>
/* Compilation is void if BKTR_USE_FREEBSD_SMBUS is not
* defined. This allows bktr owners to have smbus active for there
* motherboard and still use their bktr without smbus.
*/
#if defined(BKTR_USE_FREEBSD_SMBUS)
#define BTI2C_DEBUG(x) if (bti2c_debug) (x)
static int bti2c_debug = 0;
/*
* Call this to pass the address of the bktr device to the
* bti2c_i2c layer and initialize all the I2C bus architecture
*/
int bt848_i2c_attach(device_t dev)
{
struct bktr_softc *bktr_sc = (struct bktr_softc *)device_get_softc(dev);
struct bktr_i2c_softc *sc = &bktr_sc->i2c_sc;
sc->smbus = device_add_child(dev, "smbus", -1);
sc->iicbb = device_add_child(dev, "iicbb", -1);
if (!sc->iicbb || !sc->smbus)
return ENXIO;
bus_generic_attach(dev);
return (0);
};
int bt848_i2c_detach(device_t dev)
{
struct bktr_softc *bktr_sc = (struct bktr_softc *)device_get_softc(dev);
struct bktr_i2c_softc *sc = &bktr_sc->i2c_sc;
int error = 0;
if ((error = bus_generic_detach(dev)))
goto error;
if (sc->iicbb && (error = device_delete_child(dev, sc->iicbb)))
goto error;
if (sc->smbus && (error = device_delete_child(dev, sc->smbus)))
goto error;
error:
return (error);
}
int bti2c_smb_callback(device_t dev, int index, void *data)
{
struct bktr_softc *bktr_sc = (struct bktr_softc *)device_get_softc(dev);
struct bktr_i2c_softc *sc = &bktr_sc->i2c_sc;
int error = 0;
/* test each time if we already have/haven't the iicbus
* to avoid deadlocks
*/
switch (index) {
case SMB_REQUEST_BUS:
/* XXX test & set */
mtx_lock(&Giant);
if (!sc->bus_owned) {
sc->bus_owned = 1;
} else
error = EWOULDBLOCK;
mtx_unlock(&Giant);
break;
case SMB_RELEASE_BUS:
/* XXX test & set */
mtx_lock(&Giant);
if (sc->bus_owned) {
sc->bus_owned = 0;
} else
error = EINVAL;
mtx_unlock(&Giant);
break;
default:
error = EINVAL;
}
return (error);
}
int bti2c_iic_callback(device_t dev, int index, caddr_t *data)
{
struct bktr_softc *bktr_sc = (struct bktr_softc *)device_get_softc(dev);
struct bktr_i2c_softc *sc = &bktr_sc->i2c_sc;
int error = 0;
/* test each time if we already have/haven't the smbus
* to avoid deadlocks
*/
switch (index) {
case IIC_REQUEST_BUS:
/* XXX test & set */
mtx_lock(&Giant);
if (!sc->bus_owned) {
sc->bus_owned = 1;
} else
error = EWOULDBLOCK;
mtx_unlock(&Giant);
break;
case IIC_RELEASE_BUS:
/* XXX test & set */
mtx_lock(&Giant);
if (sc->bus_owned) {
sc->bus_owned = 0;
} else
error = EINVAL;
mtx_unlock(&Giant);
break;
default:
error = EINVAL;
}
return (error);
}
int bti2c_iic_reset(device_t dev, u_char speed, u_char addr, u_char * oldaddr)
{
mtx_lock(&Giant);
if (oldaddr)
*oldaddr = 0; /* XXX */
mtx_unlock(&Giant);
return (IIC_ENOADDR);
}
void bti2c_iic_setsda(device_t dev, int val)
{
struct bktr_softc *sc = (struct bktr_softc *)device_get_softc(dev);
int clock;
mtx_lock(&Giant);
clock = INL(sc, BKTR_I2C_DATA_CTL) & 0x2;
if (val)
OUTL(sc, BKTR_I2C_DATA_CTL, clock | 1);
else
OUTL(sc, BKTR_I2C_DATA_CTL, clock);
mtx_unlock(&Giant);
return;
}
void bti2c_iic_setscl(device_t dev, int val)
{
struct bktr_softc *sc = (struct bktr_softc *)device_get_softc(dev);
int data;
mtx_lock(&Giant);
data = INL(sc, BKTR_I2C_DATA_CTL) & 0x1;
if (val)
OUTL(sc, BKTR_I2C_DATA_CTL, 0x2 | data);
else
OUTL(sc, BKTR_I2C_DATA_CTL, data);
mtx_unlock(&Giant);
return;
}
int
bti2c_iic_getsda(device_t dev)
{
struct bktr_softc *sc = (struct bktr_softc *)device_get_softc(dev);
int retval;
mtx_lock(&Giant);
retval = INL(sc,BKTR_I2C_DATA_CTL) & 0x1;
mtx_unlock(&Giant);
return (retval);
}
int
bti2c_iic_getscl(device_t dev)
{
return (0);
}
static int
bti2c_write(struct bktr_softc *sc, u_long data)
{
u_long x;
mtx_lock(&Giant);
/* clear status bits */
OUTL(sc, BKTR_INT_STAT, (BT848_INT_RACK | BT848_INT_I2CDONE));
BTI2C_DEBUG(printf("w%lx", data));
/* write the address and data */
OUTL(sc, BKTR_I2C_DATA_CTL, data);
/* wait for completion */
for ( x = 0x7fffffff; x; --x ) { /* safety valve */
if ( INL(sc, BKTR_INT_STAT) & BT848_INT_I2CDONE )
break;
}
/* check for ACK */
if ( !x || !( INL(sc, BKTR_INT_STAT) & BT848_INT_RACK) ) {
BTI2C_DEBUG(printf("%c%c", (!x)?'+':'-',
(!( INL(sc, BKTR_INT_STAT) & BT848_INT_RACK))?'+':'-'));
mtx_unlock(&Giant);
return (SMB_ENOACK);
}
BTI2C_DEBUG(printf("+"));
mtx_unlock(&Giant);
/* return OK */
return( 0 );
}
int
bti2c_smb_writeb(device_t dev, u_char slave, char cmd, char byte)
{
struct bktr_softc *sc = (struct bktr_softc *)device_get_softc(dev);
u_long data;
data = ((slave & 0xff) << 24) | ((byte & 0xff) << 16) | (u_char)cmd;
return (bti2c_write(sc, data));
}
/*
* byte1 becomes low byte of word
* byte2 becomes high byte of word
*/
int
bti2c_smb_writew(device_t dev, u_char slave, char cmd, short word)
{
struct bktr_softc *sc = (struct bktr_softc *)device_get_softc(dev);
u_long data;
char low, high;
low = (char)(word & 0xff);
high = (char)((word & 0xff00) >> 8);
data = ((slave & 0xff) << 24) | ((low & 0xff) << 16) |
((high & 0xff) << 8) | BT848_DATA_CTL_I2CW3B | (u_char)cmd;
return (bti2c_write(sc, data));
}
/*
* The Bt878 and Bt879 differed on the treatment of i2c commands
*/
int
bti2c_smb_readb(device_t dev, u_char slave, char cmd, char *byte)
{
struct bktr_softc *sc = (struct bktr_softc *)device_get_softc(dev);
u_long x;
mtx_lock(&Giant);
/* clear status bits */
OUTL(sc,BKTR_INT_STAT, (BT848_INT_RACK | BT848_INT_I2CDONE));
OUTL(sc,BKTR_I2C_DATA_CTL, ((slave & 0xff) << 24) | (u_char)cmd);;
BTI2C_DEBUG(printf("r%lx/", (u_long)(((slave & 0xff) << 24) | (u_char)cmd)));
/* wait for completion */
for ( x = 0x7fffffff; x; --x ) { /* safety valve */
if ( INL(sc,BKTR_INT_STAT) & BT848_INT_I2CDONE )
break;
}
/* check for ACK */
if ( !x || !(INL(sc,BKTR_INT_STAT) & BT848_INT_RACK) ) {
BTI2C_DEBUG(printf("r%c%c", (!x)?'+':'-',
(!( INL(sc,BKTR_INT_STAT) & BT848_INT_RACK))?'+':'-'));
mtx_unlock(&Giant);
return (SMB_ENOACK);
}
*byte = (char)((INL(sc,BKTR_I2C_DATA_CTL) >> 8) & 0xff);
BTI2C_DEBUG(printf("r%x+", *byte));
mtx_unlock(&Giant);
return (0);
}
DRIVER_MODULE(iicbb, bktr, iicbb_driver, iicbb_devclass, 0, 0);
DRIVER_MODULE(smbus, bktr, smbus_driver, smbus_devclass, 0, 0);
#endif /* defined(BKTR_USE_FREEBSD_SMBUS) */
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