/**
* cio_enable_subchannel - enable a subchannel.
* @sch: subchannel to be enabled
* @intparm: interruption parameter to set
*/
int cio_enable_subchannel(struct subchannel *sch, u32 intparm)
{
int ret;
CIO_TRACE_EVENT(2, "ensch");
CIO_TRACE_EVENT(2, dev_name(&sch->dev));
if (sch_is_pseudo_sch(sch))
return -EINVAL;
if (cio_update_schib(sch))
return -ENODEV;
sch->config.ena = 1;
sch->config.isc = sch->isc;
sch->config.intparm = intparm;
ret = cio_commit_config(sch);
if (ret == -EIO) {
/*
* Got a program check in msch. Try without
* the concurrent sense bit the next time.
*/
sch->config.csense = 0;
ret = cio_commit_config(sch);
}
CIO_HEX_EVENT(2, &ret, sizeof(ret));
return ret;
}
struct subchannel *cio_probe_console(void)
{
struct subchannel_id schid;
struct subchannel *sch;
int sch_no, ret;
sch_no = cio_get_console_sch_no();
if (sch_no == -1) {
pr_warning("No CCW console was found\n");
return ERR_PTR(-ENODEV);
}
init_subchannel_id(&schid);
schid.sch_no = sch_no;
sch = css_alloc_subchannel(schid);
if (IS_ERR(sch))
return sch;
lockdep_set_class(sch->lock, &console_sch_key);
isc_register(CONSOLE_ISC);
sch->config.isc = CONSOLE_ISC;
sch->config.intparm = (u32)(addr_t)sch;
ret = cio_commit_config(sch);
if (ret) {
isc_unregister(CONSOLE_ISC);
put_device(&sch->dev);
return ERR_PTR(ret);
}
console_sch = sch;
return sch;
}
/**
* cio_disable_subchannel - disable a subchannel.
* @sch: subchannel to disable
*/
int cio_disable_subchannel(struct subchannel *sch)
{
int retry;
int ret;
CIO_TRACE_EVENT(2, "dissch");
CIO_TRACE_EVENT(2, dev_name(&sch->dev));
if (sch_is_pseudo_sch(sch))
return 0;
if (cio_update_schib(sch))
return -ENODEV;
sch->config.ena = 0;
for (retry = 0; retry < 3; retry++) {
ret = cio_commit_config(sch);
if (ret == -EBUSY) {
struct irb irb;
if (tsch(sch->schid, &irb) != 0)
break;
} else
break;
}
CIO_HEX_EVENT(2, &ret, sizeof(ret));
return ret;
}
int cio_enable_subchannel(struct subchannel *sch, u32 intparm)
{
int retry;
int ret;
CIO_TRACE_EVENT(2, "ensch");
CIO_TRACE_EVENT(2, dev_name(&sch->dev));
if (sch_is_pseudo_sch(sch))
return -EINVAL;
if (cio_update_schib(sch))
return -ENODEV;
sch->config.ena = 1;
sch->config.isc = sch->isc;
sch->config.intparm = intparm;
for (retry = 0; retry < 3; retry++) {
ret = cio_commit_config(sch);
if (ret == -EIO) {
sch->config.csense = 0;
} else if (ret == -EBUSY) {
struct irb irb;
if (tsch(sch->schid, &irb) != 0)
break;
} else
break;
}
CIO_HEX_EVENT(2, &ret, sizeof(ret));
return ret;
}
void
cio_release_console(void)
{
console_subchannel.config.intparm = 0;
cio_commit_config(&console_subchannel);
isc_unregister(CONSOLE_ISC);
console_subchannel_in_use = 0;
}
static void css_subchannel_release(struct device *dev)
{
struct subchannel *sch = to_subchannel(dev);
sch->config.intparm = 0;
cio_commit_config(sch);
kfree(sch->lock);
kfree(sch);
}
static int set_schib(struct ccw_device *cdev, u32 mme, int mbfc,
unsigned long address)
{
struct subchannel *sch;
sch = to_subchannel(cdev->dev.parent);
sch->config.mme = mme;
sch->config.mbfc = mbfc;
/* address can be either a block address or a block index */
if (mbfc)
sch->config.mba = address;
else
sch->config.mbi = address;
return cio_commit_config(sch);
}
/**
* cio_disable_subchannel - disable a subchannel.
* @sch: subchannel to disable
*/
int cio_disable_subchannel(struct subchannel *sch)
{
int ret;
CIO_TRACE_EVENT(2, "dissch");
CIO_TRACE_EVENT(2, dev_name(&sch->dev));
if (sch_is_pseudo_sch(sch))
return 0;
if (cio_update_schib(sch))
return -ENODEV;
sch->config.ena = 0;
ret = cio_commit_config(sch);
CIO_HEX_EVENT(2, &ret, sizeof(ret));
return ret;
}
struct subchannel *
cio_probe_console(void)
{
int sch_no, ret;
struct subchannel_id schid;
if (xchg(&console_subchannel_in_use, 1) != 0)
return ERR_PTR(-EBUSY);
sch_no = cio_get_console_sch_no();
if (sch_no == -1) {
console_subchannel_in_use = 0;
pr_warning("No CCW console was found\n");
return ERR_PTR(-ENODEV);
}
memset(&console_subchannel, 0, sizeof(struct subchannel));
init_subchannel_id(&schid);
schid.sch_no = sch_no;
ret = cio_validate_subchannel(&console_subchannel, schid);
if (ret) {
console_subchannel_in_use = 0;
return ERR_PTR(-ENODEV);
}
/*
* enable console I/O-interrupt subclass
*/
isc_register(CONSOLE_ISC);
console_subchannel.config.isc = CONSOLE_ISC;
console_subchannel.config.intparm = (u32)(addr_t)&console_subchannel;
ret = cio_commit_config(&console_subchannel);
if (ret) {
isc_unregister(CONSOLE_ISC);
console_subchannel_in_use = 0;
return ERR_PTR(ret);
}
return &console_subchannel;
}
/**
* cio_enable_subchannel - enable a subchannel.
* @sch: subchannel to be enabled
* @intparm: interruption parameter to set
*/
int cio_enable_subchannel(struct subchannel *sch, u32 intparm)
{
char dbf_txt[15];
int retry;
int ret;
CIO_TRACE_EVENT (2, "ensch");
CIO_TRACE_EVENT(2, dev_name(&sch->dev));
if (sch_is_pseudo_sch(sch))
return -EINVAL;
if (cio_update_schib(sch))
return -ENODEV;
sch->config.ena = 1;
sch->config.isc = sch->isc;
sch->config.intparm = intparm;
for (retry = 0; retry < 3; retry++) {
ret = cio_commit_config(sch);
if (ret == -EIO) {
/*
* Got a program check in msch. Try without
* the concurrent sense bit the next time.
*/
sch->config.csense = 0;
} else if (ret == -EBUSY) {
struct irb irb;
if (tsch(sch->schid, &irb) != 0)
break;
} else
break;
}
sprintf (dbf_txt, "ret:%d", ret);
CIO_TRACE_EVENT (2, dbf_txt);
return ret;
}
static int set_schib(struct ccw_device *cdev, u32 mme, int mbfc,
unsigned long address)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
int ret;
sch->config.mme = mme;
sch->config.mbfc = mbfc;
/* address can be either a block address or a block index */
if (mbfc)
sch->config.mba = address;
else
sch->config.mbi = address;
ret = cio_commit_config(sch);
if (!mme && ret == -ENODEV) {
/*
* The task was to disable measurement block updates but
* the subchannel is already gone. Report success.
*/
ret = 0;
}
return ret;
}
