static int rpm_clk_is_enabled(struct clk *clk)
{
return !!(rpm_clk_get_rate(clk));
}
static unsigned rpm_clk_is_enabled(unsigned id)
{
return !!(rpm_clk_get_rate(id));
}
static int clk_rpmrs_set_rate(struct rpm_clk *r, uint32_t value,
uint32_t context)
{
struct msm_rpm_iv_pair iv = {
.id = r->rpm_clk_id,
.value = value,
};
return msm_rpmrs_set(context, &iv, 1);
}
static int clk_rpmrs_get_rate(struct rpm_clk *r)
{
int rc;
struct msm_rpm_iv_pair iv = { .id = r->rpm_status_id, };
rc = msm_rpm_get_status(&iv, 1);
return (rc < 0) ? rc : iv.value * 1000;
}
static int clk_rpmrs_handoff(struct rpm_clk *r)
{
struct msm_rpm_iv_pair iv = { .id = r->rpm_status_id, };
int rc = msm_rpm_get_status(&iv, 1);
if (rc < 0)
return rc;
if (!r->branch)
r->c.rate = iv.value * 1000;
return 0;
}
static int clk_rpmrs_set_rate_smd(struct rpm_clk *r, uint32_t value,
uint32_t context)
{
struct msm_rpm_kvp kvp = {
.key = r->rpm_key,
.data = (void *)&value,
.length = sizeof(value),
};
return msm_rpm_send_message(context, r->rpm_res_type, r->rpm_clk_id,
&kvp, 1);
}
static int clk_rpmrs_handoff_smd(struct rpm_clk *r)
{
if (!r->branch)
r->c.rate = INT_MAX;
return 0;
}
struct clk_rpmrs_data {
int (*set_rate_fn)(struct rpm_clk *r, uint32_t value, uint32_t context);
int (*get_rate_fn)(struct rpm_clk *r);
int (*handoff_fn)(struct rpm_clk *r);
int ctx_active_id;
int ctx_sleep_id;
};
struct clk_rpmrs_data clk_rpmrs_data = {
.set_rate_fn = clk_rpmrs_set_rate,
.get_rate_fn = clk_rpmrs_get_rate,
.handoff_fn = clk_rpmrs_handoff,
.ctx_active_id = MSM_RPM_CTX_SET_0,
.ctx_sleep_id = MSM_RPM_CTX_SET_SLEEP,
};
struct clk_rpmrs_data clk_rpmrs_data_smd = {
.set_rate_fn = clk_rpmrs_set_rate_smd,
.handoff_fn = clk_rpmrs_handoff_smd,
.ctx_active_id = MSM_RPM_CTX_ACTIVE_SET,
.ctx_sleep_id = MSM_RPM_CTX_SLEEP_SET,
};
static DEFINE_MUTEX(rpm_clock_lock);
static void to_active_sleep_khz(struct rpm_clk *r, unsigned long rate,
unsigned long *active_khz, unsigned long *sleep_khz)
{
/* Convert the rate (hz) to khz */
*active_khz = DIV_ROUND_UP(rate, 1000);
/*
* Active-only clocks don't care what the rate is during sleep. So,
* they vote for zero.
*/
if (r->active_only)
*sleep_khz = 0;
else
*sleep_khz = *active_khz;
}
static int rpm_clk_prepare(struct clk *clk)
{
struct rpm_clk *r = to_rpm_clk(clk);
uint32_t value;
int rc = 0;
unsigned long this_khz, this_sleep_khz;
unsigned long peer_khz = 0, peer_sleep_khz = 0;
struct rpm_clk *peer = r->peer;
mutex_lock(&rpm_clock_lock);
to_active_sleep_khz(r, r->c.rate, &this_khz, &this_sleep_khz);
/* Don't send requests to the RPM if the rate has not been set. */
if (this_khz == 0)
goto out;
/* Take peer clock's rate into account only if it's enabled. */
if (peer->enabled)
to_active_sleep_khz(peer, peer->c.rate,
&peer_khz, &peer_sleep_khz);
value = max(this_khz, peer_khz);
if (r->branch)
value = !!value;
rc = clk_rpmrs_set_rate_active(r, value);
if (rc)
goto out;
value = max(this_sleep_khz, peer_sleep_khz);
if (r->branch)
value = !!value;
rc = clk_rpmrs_set_rate_sleep(r, value);
if (rc) {
/* Undo the active set vote and restore it to peer_khz */
value = peer_khz;
rc = clk_rpmrs_set_rate_active(r, value);
}
out:
if (!rc)
r->enabled = true;
mutex_unlock(&rpm_clock_lock);
return rc;
}
static void rpm_clk_unprepare(struct clk *clk)
{
struct rpm_clk *r = to_rpm_clk(clk);
mutex_lock(&rpm_clock_lock);
if (r->c.rate) {
uint32_t value;
struct rpm_clk *peer = r->peer;
unsigned long peer_khz = 0, peer_sleep_khz = 0;
int rc;
/* Take peer clock's rate into account only if it's enabled. */
if (peer->enabled)
to_active_sleep_khz(peer, peer->c.rate,
&peer_khz, &peer_sleep_khz);
value = r->branch ? !!peer_khz : peer_khz;
rc = clk_rpmrs_set_rate_active(r, value);
if (rc)
goto out;
value = r->branch ? !!peer_sleep_khz : peer_sleep_khz;
rc = clk_rpmrs_set_rate_sleep(r, value);
}
r->enabled = false;
out:
mutex_unlock(&rpm_clock_lock);
return;
}
static int rpm_clk_set_rate(struct clk *clk, unsigned long rate)
{
struct rpm_clk *r = to_rpm_clk(clk);
unsigned long this_khz, this_sleep_khz;
int rc = 0;
mutex_lock(&rpm_clock_lock);
if (r->enabled) {
uint32_t value;
struct rpm_clk *peer = r->peer;
unsigned long peer_khz = 0, peer_sleep_khz = 0;
to_active_sleep_khz(r, rate, &this_khz, &this_sleep_khz);
/* Take peer clock's rate into account only if it's enabled. */
if (peer->enabled)
to_active_sleep_khz(peer, peer->c.rate,
&peer_khz, &peer_sleep_khz);
value = max(this_khz, peer_khz);
rc = clk_rpmrs_set_rate_active(r, value);
if (rc)
goto out;
value = max(this_sleep_khz, peer_sleep_khz);
rc = clk_rpmrs_set_rate_sleep(r, value);
}
out:
mutex_unlock(&rpm_clock_lock);
return rc;
}
static int rpm_branch_clk_set_rate(struct clk *clk, unsigned long rate)
{
if (rate == clk->rate)
return 0;
return -EPERM;
}
static unsigned long rpm_clk_get_rate(struct clk *clk)
{
struct rpm_clk *r = to_rpm_clk(clk);
if (r->rpmrs_data->get_rate_fn)
return r->rpmrs_data->get_rate_fn(r);
else
return clk->rate;
}
static int rpm_clk_is_enabled(struct clk *clk)
{
return !!(rpm_clk_get_rate(clk));
}
static long rpm_clk_round_rate(struct clk *clk, unsigned long rate)
{
/* Not supported. */
return rate;
}
static bool rpm_clk_is_local(struct clk *clk)
{
return false;
}
static enum handoff rpm_clk_handoff(struct clk *clk)
{
struct rpm_clk *r = to_rpm_clk(clk);
int rc;
/*
* Querying an RPM clock's status will return 0 unless the clock's
* rate has previously been set through the RPM. When handing off,
* assume these clocks are enabled (unless the RPM call fails) so
* child clocks of these RPM clocks can still be handed off.
*/
rc = r->rpmrs_data->handoff_fn(r);
if (rc < 0)
return HANDOFF_DISABLED_CLK;
/*
* Since RPM handoff code may update the software rate of the clock by
* querying the RPM, we need to make sure our request to RPM now
* matches the software rate of the clock. When we send the request
* to RPM, we also need to update any other state info we would
* normally update. So, call the appropriate clock function instead
* of directly using the RPM driver APIs.
*/
rc = rpm_clk_prepare(clk);
if (rc < 0)
return HANDOFF_DISABLED_CLK;
return HANDOFF_ENABLED_CLK;
}
struct clk_ops clk_ops_rpm = {
.prepare = rpm_clk_prepare,
.unprepare = rpm_clk_unprepare,
.set_rate = rpm_clk_set_rate,
.get_rate = rpm_clk_get_rate,
.is_enabled = rpm_clk_is_enabled,
.round_rate = rpm_clk_round_rate,
.is_local = rpm_clk_is_local,
.handoff = rpm_clk_handoff,
};
struct clk_ops clk_ops_rpm_branch = {
.prepare = rpm_clk_prepare,
.unprepare = rpm_clk_unprepare,
.set_rate = rpm_branch_clk_set_rate,
.is_local = rpm_clk_is_local,
.handoff = rpm_clk_handoff,
};