/*
* Standard clock functions defined in include/linux/clk.h
*/
int clk_enable(struct clk *clk)
{
int ret = 0;
unsigned long flags;
struct clk *parent;
if (!clk)
return 0;
spin_lock_irqsave(&clk->lock, flags);
if (clk->count == 0) {
parent = clk_get_parent(clk);
if (!(clk->flags&CLKFLAG_IGNORE)) {
ret = clk_enable(parent);
if (ret)
goto err_enable_parent;
ret = clk_enable(clk->depends);
if (ret)
goto err_enable_depends;
}
ret = vote_rate_vdd(clk, clk->rate);
if (ret)
goto err_vote_vdd;
if (clk->ops->enable)
ret = clk->ops->enable(clk);
if (ret)
goto err_enable_clock;
/*added by htc for clock debugging*/
if (!(clk->flags&CLKFLAG_IGNORE)) {
spin_lock(&clk_enable_list_lock);
list_add(&clk->enable_list, &clk_enable_list);
spin_unlock(&clk_enable_list_lock);
}
} else if (clk->flags & CLKFLAG_HANDOFF_RATE) {
/*
* The clock was already enabled by handoff code so there is no
* need to enable it again here. Clearing the handoff flag will
* prevent the lateinit handoff code from disabling the clock if
* a client driver still has it enabled.
*/
clk->flags &= ~CLKFLAG_HANDOFF_RATE;
goto out;
}
clk->count++;
out:
spin_unlock_irqrestore(&clk->lock, flags);
return 0;
err_enable_clock:
unvote_rate_vdd(clk, clk->rate);
err_vote_vdd:
clk_disable(clk->depends);
err_enable_depends:
clk_disable(parent);
err_enable_parent:
spin_unlock_irqrestore(&clk->lock, flags);
return ret;
}
/*
* Standard clock functions defined in include/linux/clk.h
*/
int clk_enable(struct clk *clk)
{
int ret = 0;
unsigned long flags;
struct clk *parent;
if (!clk)
return 0;
if (IS_ERR(clk))
return -EINVAL;
spin_lock_irqsave(&clk->lock, flags);
if (WARN(!clk->warned && !clk->prepare_count,
"%s: Don't call enable on unprepared clocks\n",
clk->dbg_name))
clk->warned = true;
if (clk->count == 0) {
parent = clk_get_parent(clk);
ret = clk_enable(parent);
if (ret)
goto err_enable_parent;
ret = clk_enable(clk->depends);
if (ret)
goto err_enable_depends;
ret = vote_rate_vdd(clk, clk->rate);
if (ret)
goto err_vote_vdd;
trace_clock_enable(clk->dbg_name, 1, smp_processor_id());
if (clk->ops->enable)
ret = clk->ops->enable(clk);
if (ret)
goto err_enable_clock;
} else if (clk->flags & CLKFLAG_HANDOFF_RATE) {
/*
* The clock was already enabled by handoff code so there is no
* need to enable it again here. Clearing the handoff flag will
* prevent the lateinit handoff code from disabling the clock if
* a client driver still has it enabled.
*/
clk->flags &= ~CLKFLAG_HANDOFF_RATE;
goto out;
}
clk->count++;
out:
spin_unlock_irqrestore(&clk->lock, flags);
return 0;
err_enable_clock:
unvote_rate_vdd(clk, clk->rate);
err_vote_vdd:
clk_disable(clk->depends);
err_enable_depends:
clk_disable(parent);
err_enable_parent:
spin_unlock_irqrestore(&clk->lock, flags);
return ret;
}
int clk_set_rate(struct clk *clk, unsigned long rate)
{
unsigned long start_rate, flags;
int rc;
if (IS_ERR_OR_NULL(clk))
return -EINVAL;
if (!clk->ops->set_rate)
return -ENOSYS;
spin_lock_irqsave(&clk->lock, flags);
trace_clock_set_rate(clk->dbg_name, rate, smp_processor_id());
if (clk->count) {
start_rate = clk->rate;
/* Enforce vdd requirements for target frequency. */
rc = vote_rate_vdd(clk, rate);
if (rc)
goto err_vote_vdd;
rc = clk->ops->set_rate(clk, rate);
if (rc)
goto err_set_rate;
/* Release vdd requirements for starting frequency. */
unvote_rate_vdd(clk, start_rate);
} else {
rc = clk->ops->set_rate(clk, rate);
}
if (!rc)
clk->rate = rate;
spin_unlock_irqrestore(&clk->lock, flags);
return rc;
err_set_rate:
unvote_rate_vdd(clk, rate);
err_vote_vdd:
spin_unlock_irqrestore(&clk->lock, flags);
return rc;
}
static int _clk_set_rate(struct clk *clk, unsigned long rate,
int (*set_fn)(struct clk *, unsigned long))
{
unsigned long start_rate, flags;
int rc;
if (!set_fn)
return -ENOSYS;
spin_lock_irqsave(&clk->lock, flags);
if (clk->count) {
start_rate = clk->rate;
/* Enforce vdd requirements for target frequency. */
rc = vote_rate_vdd(clk, rate);
if (rc)
goto err_vote_vdd;
rc = set_fn(clk, rate);
if (rc)
goto err_set_rate;
/* Release vdd requirements for starting frequency. */
unvote_rate_vdd(clk, start_rate);
} else {
rc = set_fn(clk, rate);
}
if (!rc)
clk->rate = rate;
spin_unlock_irqrestore(&clk->lock, flags);
return rc;
err_set_rate:
unvote_rate_vdd(clk, rate);
err_vote_vdd:
spin_unlock_irqrestore(&clk->lock, flags);
return rc;
}