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freebsd-dev/sys/dev/ichsmb/ichsmb.c
John Baldwin 7048a99c30 Minor overhaul of SMBus support: 
- Change smbus_callback() to pass a void * rather than caddr_t.
- Change smbus_bread() to pass a pointer to the count and have it be an
  in/out parameter.  The input is the size of the buffer (same as before),
  but on return it will contain the actual amount of data read back from
  the bus.  Note that this value may be larger than the input value.  It
  is up to the caller to treat this as an error if desired.
- Change the SMB_BREAD ioctl to write out the updated struct smbcmd which
  will contain the actual number of bytes read in the 'count' field.  To
  preserve the previous ABI, the old ioctl value is mapped to SMB_OLD_BREAD
  which doesn't copy the updated smbcmd back out to userland.  I doubt anyone
  actually used the old BREAD anyway as it was rediculous to do a bulk-read
  but not tell the using program how much data was actually read.
- Make the smbus driver and devclass public in the smbus module and
  push all the DRIVER_MODULE()'s for attaching the smbus driver to
  various foosmb drivers out into the foosmb modules.  This makes all
  the foosmb logic centralized and allows new foosmb modules to be
  self-contained w/o having to hack smbus.c everytime a new smbus driver
  is added.
- Add a new SMB_EINVAL error bit and use it in place of EINVAL to return
  an error for bad arguments (such as invalid counts for bread and bwrite).
- Map SMB bus error bits to EIO in smbus_error().
- Make the smbus driver call bus_generic_probe() and require child drivers
  such as smb(4) to create device_t's via identify routines.  Previously,
  smbus just created one anonymous device during attach, and if you had
  multiple drivers that could attach it was just random chance as to which
  driver got to probe for the sole device_t first.
- Add a mutex to the smbus(4) softc and use it in place of dummy splhigh()
  to protect the 'owner' field and perform necessary synchronization for
  smbus_request_bus() and smbus_release_bus().
- Change the bread() and bwrite() methods of alpm(4), amdpm(4), and
  viapm(4) to only perform a single transaction and not try to use a
  loop of multiple transactions for a large request.  The framing and
  commands to use for a large transaction depend on the upper-layer
  protocol (such as SSIF for IPMI over SMBus) from what I can tell, and the
  smb(4) driver never allowed bulk read/writes of more than 32-bytes
  anyway.  The other smb drivers only performed single transactions.
- Fix buffer overflows in the bread() methods of ichsmb(4), alpm(4),
  amdpm(4), amdsmb(4), intpm(4), and nfsmb(4).
- Use SMB_xxx errors in viapm(4).
- Destroy ichsmb(4)'s mutex after bus_generic_detach() to avoid problems
  from child devices making smb upcalls that would use the mutex during
  their detach methods.

MFC after:	1 week
Reviewed by:	jmg (mostly)
2006-09-11 20:52:41 +00:00

692 lines
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/*-
* ichsmb.c
*
* Author: Archie Cobbs <archie@freebsd.org>
* Copyright (c) 2000 Whistle Communications, Inc.
* All rights reserved.
*
* Subject to the following obligations and disclaimer of warranty, use and
* redistribution of this software, in source or object code forms, with or
* without modifications are expressly permitted by Whistle Communications;
* provided, however, that:
* 1. Any and all reproductions of the source or object code must include the
* copyright notice above and the following disclaimer of warranties; and
* 2. No rights are granted, in any manner or form, to use Whistle
* Communications, Inc. trademarks, including the mark "WHISTLE
* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
* such appears in the above copyright notice or in the software.
*
* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER 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 WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* Support for the SMBus controller logical device which is part of the
* Intel 81801AA (ICH) and 81801AB (ICH0) I/O controller hub chips.
*
* This driver assumes that the generic SMBus code will ensure that
* at most one process at a time calls into the SMBus methods below.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/errno.h>
#include <sys/lock.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/syslog.h>
#include <sys/bus.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <machine/resource.h>
#include <dev/smbus/smbconf.h>
#include <dev/ichsmb/ichsmb_var.h>
#include <dev/ichsmb/ichsmb_reg.h>
/*
* Enable debugging by defining ICHSMB_DEBUG to a non-zero value.
*/
#define ICHSMB_DEBUG 0
#if ICHSMB_DEBUG != 0 && defined(__CC_SUPPORTS___FUNC__)
#define DBG(fmt, args...) \
do { log(LOG_DEBUG, "%s: " fmt, __func__ , ## args); } while (0)
#else
#define DBG(fmt, args...) do { } while (0)
#endif
/*
* Our child device driver name
*/
#define DRIVER_SMBUS "smbus"
/*
* Internal functions
*/
static int ichsmb_wait(sc_p sc);
/********************************************************************
BUS-INDEPENDENT BUS METHODS
********************************************************************/
/*
* Handle probe-time duties that are independent of the bus
* our device lives on.
*/
int
ichsmb_probe(device_t dev)
{
return (BUS_PROBE_DEFAULT);
}
/*
* Handle attach-time duties that are independent of the bus
* our device lives on.
*/
int
ichsmb_attach(device_t dev)
{
const sc_p sc = device_get_softc(dev);
int error;
/* Add child: an instance of the "smbus" device */
if ((sc->smb = device_add_child(dev, DRIVER_SMBUS, -1)) == NULL) {
log(LOG_ERR, "%s: no \"%s\" child found\n",
device_get_nameunit(dev), DRIVER_SMBUS);
return (ENXIO);
}
/* Clear interrupt conditions */
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_HST_STA, 0xff);
/* Add "smbus" child */
if ((error = bus_generic_attach(dev)) != 0) {
log(LOG_ERR, "%s: failed to attach child: %d\n",
device_get_nameunit(dev), error);
return (ENXIO);
}
/* Create mutex */
mtx_init(&sc->mutex, device_get_nameunit(dev), "ichsmb", MTX_DEF);
return (0);
}
/********************************************************************
SMBUS METHODS
********************************************************************/
int
ichsmb_callback(device_t dev, int index, void *data)
{
int smb_error = 0;
DBG("index=%d how=%d\n", index, data ? *(int *)data : -1);
switch (index) {
case SMB_REQUEST_BUS:
break;
case SMB_RELEASE_BUS:
break;
default:
smb_error = SMB_EABORT; /* XXX */
break;
}
DBG("smb_error=%d\n", smb_error);
return (smb_error);
}
int
ichsmb_quick(device_t dev, u_char slave, int how)
{
const sc_p sc = device_get_softc(dev);
int smb_error;
DBG("slave=0x%02x how=%d\n", slave, how);
KASSERT(sc->ich_cmd == -1,
("%s: ich_cmd=%d\n", __func__ , sc->ich_cmd));
switch (how) {
case SMB_QREAD:
case SMB_QWRITE:
mtx_lock(&sc->mutex);
sc->ich_cmd = ICH_HST_CNT_SMB_CMD_QUICK;
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_XMIT_SLVA,
(slave << 1) | (how == SMB_QREAD ?
ICH_XMIT_SLVA_READ : ICH_XMIT_SLVA_WRITE));
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_HST_CNT,
ICH_HST_CNT_START | ICH_HST_CNT_INTREN | sc->ich_cmd);
smb_error = ichsmb_wait(sc);
mtx_unlock(&sc->mutex);
break;
default:
smb_error = SMB_ENOTSUPP;
}
DBG("smb_error=%d\n", smb_error);
return (smb_error);
}
int
ichsmb_sendb(device_t dev, u_char slave, char byte)
{
const sc_p sc = device_get_softc(dev);
int smb_error;
DBG("slave=0x%02x byte=0x%02x\n", slave, (u_char)byte);
KASSERT(sc->ich_cmd == -1,
("%s: ich_cmd=%d\n", __func__ , sc->ich_cmd));
mtx_lock(&sc->mutex);
sc->ich_cmd = ICH_HST_CNT_SMB_CMD_BYTE;
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_XMIT_SLVA,
(slave << 1) | ICH_XMIT_SLVA_WRITE);
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_HST_CMD, byte);
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_HST_CNT,
ICH_HST_CNT_START | ICH_HST_CNT_INTREN | sc->ich_cmd);
smb_error = ichsmb_wait(sc);
mtx_unlock(&sc->mutex);
DBG("smb_error=%d\n", smb_error);
return (smb_error);
}
int
ichsmb_recvb(device_t dev, u_char slave, char *byte)
{
const sc_p sc = device_get_softc(dev);
int smb_error;
DBG("slave=0x%02x\n", slave);
KASSERT(sc->ich_cmd == -1,
("%s: ich_cmd=%d\n", __func__ , sc->ich_cmd));
mtx_lock(&sc->mutex);
sc->ich_cmd = ICH_HST_CNT_SMB_CMD_BYTE;
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_XMIT_SLVA,
(slave << 1) | ICH_XMIT_SLVA_READ);
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_HST_CNT,
ICH_HST_CNT_START | ICH_HST_CNT_INTREN | sc->ich_cmd);
if ((smb_error = ichsmb_wait(sc)) == SMB_ENOERR)
*byte = bus_space_read_1(sc->io_bst, sc->io_bsh, ICH_D0);
mtx_unlock(&sc->mutex);
DBG("smb_error=%d byte=0x%02x\n", smb_error, (u_char)*byte);
return (smb_error);
}
int
ichsmb_writeb(device_t dev, u_char slave, char cmd, char byte)
{
const sc_p sc = device_get_softc(dev);
int smb_error;
DBG("slave=0x%02x cmd=0x%02x byte=0x%02x\n",
slave, (u_char)cmd, (u_char)byte);
KASSERT(sc->ich_cmd == -1,
("%s: ich_cmd=%d\n", __func__ , sc->ich_cmd));
mtx_lock(&sc->mutex);
sc->ich_cmd = ICH_HST_CNT_SMB_CMD_BYTE_DATA;
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_XMIT_SLVA,
(slave << 1) | ICH_XMIT_SLVA_WRITE);
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_HST_CMD, cmd);
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_D0, byte);
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_HST_CNT,
ICH_HST_CNT_START | ICH_HST_CNT_INTREN | sc->ich_cmd);
smb_error = ichsmb_wait(sc);
mtx_unlock(&sc->mutex);
DBG("smb_error=%d\n", smb_error);
return (smb_error);
}
int
ichsmb_writew(device_t dev, u_char slave, char cmd, short word)
{
const sc_p sc = device_get_softc(dev);
int smb_error;
DBG("slave=0x%02x cmd=0x%02x word=0x%04x\n",
slave, (u_char)cmd, (u_int16_t)word);
KASSERT(sc->ich_cmd == -1,
("%s: ich_cmd=%d\n", __func__ , sc->ich_cmd));
mtx_lock(&sc->mutex);
sc->ich_cmd = ICH_HST_CNT_SMB_CMD_WORD_DATA;
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_XMIT_SLVA,
(slave << 1) | ICH_XMIT_SLVA_WRITE);
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_HST_CMD, cmd);
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_D0, word & 0xff);
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_D1, word >> 8);
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_HST_CNT,
ICH_HST_CNT_START | ICH_HST_CNT_INTREN | sc->ich_cmd);
smb_error = ichsmb_wait(sc);
mtx_unlock(&sc->mutex);
DBG("smb_error=%d\n", smb_error);
return (smb_error);
}
int
ichsmb_readb(device_t dev, u_char slave, char cmd, char *byte)
{
const sc_p sc = device_get_softc(dev);
int smb_error;
DBG("slave=0x%02x cmd=0x%02x\n", slave, (u_char)cmd);
KASSERT(sc->ich_cmd == -1,
("%s: ich_cmd=%d\n", __func__ , sc->ich_cmd));
mtx_lock(&sc->mutex);
sc->ich_cmd = ICH_HST_CNT_SMB_CMD_BYTE_DATA;
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_XMIT_SLVA,
(slave << 1) | ICH_XMIT_SLVA_READ);
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_HST_CMD, cmd);
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_HST_CNT,
ICH_HST_CNT_START | ICH_HST_CNT_INTREN | sc->ich_cmd);
if ((smb_error = ichsmb_wait(sc)) == SMB_ENOERR)
*byte = bus_space_read_1(sc->io_bst, sc->io_bsh, ICH_D0);
mtx_unlock(&sc->mutex);
DBG("smb_error=%d byte=0x%02x\n", smb_error, (u_char)*byte);
return (smb_error);
}
int
ichsmb_readw(device_t dev, u_char slave, char cmd, short *word)
{
const sc_p sc = device_get_softc(dev);
int smb_error;
DBG("slave=0x%02x cmd=0x%02x\n", slave, (u_char)cmd);
KASSERT(sc->ich_cmd == -1,
("%s: ich_cmd=%d\n", __func__ , sc->ich_cmd));
mtx_lock(&sc->mutex);
sc->ich_cmd = ICH_HST_CNT_SMB_CMD_WORD_DATA;
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_XMIT_SLVA,
(slave << 1) | ICH_XMIT_SLVA_READ);
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_HST_CMD, cmd);
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_HST_CNT,
ICH_HST_CNT_START | ICH_HST_CNT_INTREN | sc->ich_cmd);
if ((smb_error = ichsmb_wait(sc)) == SMB_ENOERR) {
*word = (bus_space_read_1(sc->io_bst,
sc->io_bsh, ICH_D0) & 0xff)
| (bus_space_read_1(sc->io_bst,
sc->io_bsh, ICH_D1) << 8);
}
mtx_unlock(&sc->mutex);
DBG("smb_error=%d word=0x%04x\n", smb_error, (u_int16_t)*word);
return (smb_error);
}
int
ichsmb_pcall(device_t dev, u_char slave, char cmd, short sdata, short *rdata)
{
const sc_p sc = device_get_softc(dev);
int smb_error;
DBG("slave=0x%02x cmd=0x%02x sdata=0x%04x\n",
slave, (u_char)cmd, (u_int16_t)sdata);
KASSERT(sc->ich_cmd == -1,
("%s: ich_cmd=%d\n", __func__ , sc->ich_cmd));
mtx_lock(&sc->mutex);
sc->ich_cmd = ICH_HST_CNT_SMB_CMD_PROC_CALL;
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_XMIT_SLVA,
(slave << 1) | ICH_XMIT_SLVA_WRITE);
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_HST_CMD, cmd);
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_D0, sdata & 0xff);
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_D1, sdata >> 8);
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_HST_CNT,
ICH_HST_CNT_START | ICH_HST_CNT_INTREN | sc->ich_cmd);
if ((smb_error = ichsmb_wait(sc)) == SMB_ENOERR) {
*rdata = (bus_space_read_1(sc->io_bst,
sc->io_bsh, ICH_D0) & 0xff)
| (bus_space_read_1(sc->io_bst,
sc->io_bsh, ICH_D1) << 8);
}
mtx_unlock(&sc->mutex);
DBG("smb_error=%d rdata=0x%04x\n", smb_error, (u_int16_t)*rdata);
return (smb_error);
}
int
ichsmb_bwrite(device_t dev, u_char slave, char cmd, u_char count, char *buf)
{
const sc_p sc = device_get_softc(dev);
int smb_error;
DBG("slave=0x%02x cmd=0x%02x count=%d\n", slave, (u_char)cmd, count);
#if ICHSMB_DEBUG
#define DISP(ch) (((ch) < 0x20 || (ch) >= 0x7e) ? '.' : (ch))
{
u_char *p;
for (p = (u_char *)buf; p - (u_char *)buf < 32; p += 8) {
DBG("%02x: %02x %02x %02x %02x %02x %02x %02x %02x"
" %c%c%c%c%c%c%c%c", (p - (u_char *)buf),
p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7],
DISP(p[0]), DISP(p[1]), DISP(p[2]), DISP(p[3]),
DISP(p[4]), DISP(p[5]), DISP(p[6]), DISP(p[7]));
}
}
#undef DISP
#endif
KASSERT(sc->ich_cmd == -1,
("%s: ich_cmd=%d\n", __func__ , sc->ich_cmd));
if (count < 1 || count > 32)
return (SMB_EINVAL);
bcopy(buf, sc->block_data, count);
sc->block_count = count;
sc->block_index = 1;
sc->block_write = 1;
mtx_lock(&sc->mutex);
sc->ich_cmd = ICH_HST_CNT_SMB_CMD_BLOCK;
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_XMIT_SLVA,
(slave << 1) | ICH_XMIT_SLVA_WRITE);
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_HST_CMD, cmd);
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_D0, count);
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_BLOCK_DB, buf[0]);
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_HST_CNT,
ICH_HST_CNT_START | ICH_HST_CNT_INTREN | sc->ich_cmd);
smb_error = ichsmb_wait(sc);
mtx_unlock(&sc->mutex);
DBG("smb_error=%d\n", smb_error);
return (smb_error);
}
int
ichsmb_bread(device_t dev, u_char slave, char cmd, u_char *count, char *buf)
{
const sc_p sc = device_get_softc(dev);
int smb_error;
DBG("slave=0x%02x cmd=0x%02x count=%d\n", slave, (u_char)cmd, count);
KASSERT(sc->ich_cmd == -1,
("%s: ich_cmd=%d\n", __func__ , sc->ich_cmd));
if (*count < 1 || *count > 32)
return (SMB_EINVAL);
bzero(sc->block_data, sizeof(sc->block_data));
sc->block_count = 0;
sc->block_index = 0;
sc->block_write = 0;
mtx_lock(&sc->mutex);
sc->ich_cmd = ICH_HST_CNT_SMB_CMD_BLOCK;
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_XMIT_SLVA,
(slave << 1) | ICH_XMIT_SLVA_READ);
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_HST_CMD, cmd);
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_D0, *count); /* XXX? */
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_HST_CNT,
ICH_HST_CNT_START | ICH_HST_CNT_INTREN | sc->ich_cmd);
if ((smb_error = ichsmb_wait(sc)) == SMB_ENOERR) {
bcopy(sc->block_data, buf, min(sc->block_count, *count));
*count = sc->block_count;
}
mtx_unlock(&sc->mutex);
DBG("smb_error=%d\n", smb_error);
#if ICHSMB_DEBUG
#define DISP(ch) (((ch) < 0x20 || (ch) >= 0x7e) ? '.' : (ch))
{
u_char *p;
for (p = (u_char *)buf; p - (u_char *)buf < 32; p += 8) {
DBG("%02x: %02x %02x %02x %02x %02x %02x %02x %02x"
" %c%c%c%c%c%c%c%c", (p - (u_char *)buf),
p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7],
DISP(p[0]), DISP(p[1]), DISP(p[2]), DISP(p[3]),
DISP(p[4]), DISP(p[5]), DISP(p[6]), DISP(p[7]));
}
}
#undef DISP
#endif
return (smb_error);
}
/********************************************************************
OTHER FUNCTIONS
********************************************************************/
/*
* This table describes what interrupts we should ever expect to
* see after each ICH command, not including the SMBALERT interrupt.
*/
static const u_int8_t ichsmb_state_irqs[] = {
/* quick */
(ICH_HST_STA_BUS_ERR | ICH_HST_STA_DEV_ERR | ICH_HST_STA_INTR),
/* byte */
(ICH_HST_STA_BUS_ERR | ICH_HST_STA_DEV_ERR | ICH_HST_STA_INTR),
/* byte data */
(ICH_HST_STA_BUS_ERR | ICH_HST_STA_DEV_ERR | ICH_HST_STA_INTR),
/* word data */
(ICH_HST_STA_BUS_ERR | ICH_HST_STA_DEV_ERR | ICH_HST_STA_INTR),
/* process call */
(ICH_HST_STA_BUS_ERR | ICH_HST_STA_DEV_ERR | ICH_HST_STA_INTR),
/* block */
(ICH_HST_STA_BUS_ERR | ICH_HST_STA_DEV_ERR | ICH_HST_STA_INTR
| ICH_HST_STA_BYTE_DONE_STS),
/* i2c read (not used) */
(ICH_HST_STA_BUS_ERR | ICH_HST_STA_DEV_ERR | ICH_HST_STA_INTR
| ICH_HST_STA_BYTE_DONE_STS)
};
/*
* Interrupt handler. This handler is bus-independent. Note that our
* interrupt may be shared, so we must handle "false" interrupts.
*/
void
ichsmb_device_intr(void *cookie)
{
const sc_p sc = cookie;
const device_t dev = sc->dev;
const int maxloops = 16;
u_int8_t status;
u_int8_t ok_bits;
int cmd_index;
int count;
mtx_lock(&sc->mutex);
for (count = 0; count < maxloops; count++) {
/* Get and reset status bits */
status = bus_space_read_1(sc->io_bst, sc->io_bsh, ICH_HST_STA);
#if ICHSMB_DEBUG
if ((status & ~(ICH_HST_STA_INUSE_STS | ICH_HST_STA_HOST_BUSY))
|| count > 0) {
DBG("%d stat=0x%02x\n", count, status);
}
#endif
status &= ~(ICH_HST_STA_INUSE_STS | ICH_HST_STA_HOST_BUSY);
if (status == 0)
break;
/* Check for unexpected interrupt */
ok_bits = ICH_HST_STA_SMBALERT_STS;
cmd_index = sc->ich_cmd >> 2;
if (sc->ich_cmd != -1) {
KASSERT(cmd_index < sizeof(ichsmb_state_irqs),
("%s: ich_cmd=%d", device_get_nameunit(dev),
sc->ich_cmd));
ok_bits |= ichsmb_state_irqs[cmd_index];
}
if ((status & ~ok_bits) != 0) {
log(LOG_ERR, "%s: irq 0x%02x during %d\n",
device_get_nameunit(dev), status, cmd_index);
bus_space_write_1(sc->io_bst, sc->io_bsh,
ICH_HST_STA, (status & ~ok_bits));
continue;
}
/* Handle SMBALERT interrupt */
if (status & ICH_HST_STA_SMBALERT_STS) {
static int smbalert_count = 16;
if (smbalert_count > 0) {
log(LOG_WARNING, "%s: SMBALERT# rec'd\n",
device_get_nameunit(dev));
if (--smbalert_count == 0) {
log(LOG_WARNING,
"%s: not logging anymore\n",
device_get_nameunit(dev));
}
}
}
/* Check for bus error */
if (status & ICH_HST_STA_BUS_ERR) {
sc->smb_error = SMB_ECOLLI; /* XXX SMB_EBUSERR? */
goto finished;
}
/* Check for device error */
if (status & ICH_HST_STA_DEV_ERR) {
sc->smb_error = SMB_ENOACK; /* or SMB_ETIMEOUT? */
goto finished;
}
/* Check for byte completion in block transfer */
if (status & ICH_HST_STA_BYTE_DONE_STS) {
if (sc->block_write) {
if (sc->block_index < sc->block_count) {
/* Write next byte */
bus_space_write_1(sc->io_bst,
sc->io_bsh, ICH_BLOCK_DB,
sc->block_data[sc->block_index++]);
}
} else {
/* First interrupt, get the count also */
if (sc->block_index == 0) {
sc->block_count = bus_space_read_1(
sc->io_bst, sc->io_bsh, ICH_D0);
}
/* Get next byte, if any */
if (sc->block_index < sc->block_count) {
/* Read next byte */
sc->block_data[sc->block_index++] =
bus_space_read_1(sc->io_bst,
sc->io_bsh, ICH_BLOCK_DB);
/* Set "LAST_BYTE" bit before reading
the last byte of block data */
if (sc->block_index
>= sc->block_count - 1) {
bus_space_write_1(sc->io_bst,
sc->io_bsh, ICH_HST_CNT,
ICH_HST_CNT_LAST_BYTE
| ICH_HST_CNT_INTREN
| sc->ich_cmd);
}
}
}
}
/* Check command completion */
if (status & ICH_HST_STA_INTR) {
sc->smb_error = SMB_ENOERR;
finished:
sc->ich_cmd = -1;
bus_space_write_1(sc->io_bst, sc->io_bsh,
ICH_HST_STA, status);
wakeup(sc);
break;
}
/* Clear status bits and try again */
bus_space_write_1(sc->io_bst, sc->io_bsh, ICH_HST_STA, status);
}
mtx_unlock(&sc->mutex);
/* Too many loops? */
if (count == maxloops) {
log(LOG_ERR, "%s: interrupt loop, status=0x%02x\n",
device_get_nameunit(dev),
bus_space_read_1(sc->io_bst, sc->io_bsh, ICH_HST_STA));
}
}
/*
* Wait for command completion. Assumes mutex is held.
* Returns an SMB_* error code.
*/
static int
ichsmb_wait(sc_p sc)
{
const device_t dev = sc->dev;
int error, smb_error;
KASSERT(sc->ich_cmd != -1,
("%s: ich_cmd=%d\n", __func__ , sc->ich_cmd));
mtx_assert(&sc->mutex, MA_OWNED);
error = msleep(sc, &sc->mutex, PZERO, "ichsmb", hz / 4);
DBG("msleep -> %d\n", error);
switch (error) {
case 0:
smb_error = sc->smb_error;
break;
case EWOULDBLOCK:
log(LOG_ERR, "%s: device timeout, status=0x%02x\n",
device_get_nameunit(dev),
bus_space_read_1(sc->io_bst, sc->io_bsh, ICH_HST_STA));
sc->ich_cmd = -1;
smb_error = SMB_ETIMEOUT;
break;
default:
smb_error = SMB_EABORT;
break;
}
return (smb_error);
}
/*
* Release resources associated with device.
*/
void
ichsmb_release_resources(sc_p sc)
{
const device_t dev = sc->dev;
if (sc->irq_handle != NULL) {
bus_teardown_intr(dev, sc->irq_res, sc->irq_handle);
sc->irq_handle = NULL;
}
if (sc->irq_res != NULL) {
bus_release_resource(dev,
SYS_RES_IRQ, sc->irq_rid, sc->irq_res);
sc->irq_res = NULL;
}
if (sc->io_res != NULL) {
bus_release_resource(dev,
SYS_RES_IOPORT, sc->io_rid, sc->io_res);
sc->io_res = NULL;
}
}
int
ichsmb_detach(device_t dev)
{
const sc_p sc = device_get_softc(dev);
int error;
error = bus_generic_detach(dev);
if (error)
return (error);
device_delete_child(dev, sc->smb);
ichsmb_release_resources(sc);
mtx_destroy(&sc->mutex);
return 0;
}
DRIVER_MODULE(smbus, ichsmb, smbus_driver, smbus_devclass, 0, 0);
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