13 #include "ipa.h"
18  * DOC: IPA Clocking
20  * The "IPA Clock" manages both the IPA core clock and the interconnects
21  * (buses) the IPA depends on as a single logical entity.  A reference count
26  * all buses at a fixed average and peak bandwidth.  As more advanced IPA
29  * An IPA clock reference must be held for any access to IPA hardware.
45  * struct ipa_clock - IPA clocking information
48  * @core:		IPA core clock
75 /* Initialize interconnects required for IPA operation */
114 static int ipa_interconnect_enable(struct ipa *ipa)  in ipa_interconnect_enable()  argument
116 	struct ipa_clock *clock = ipa->clock;  in ipa_interconnect_enable()
142 static int ipa_interconnect_disable(struct ipa *ipa)  in ipa_interconnect_disable()  argument
144 	struct ipa_clock *clock = ipa->clock;  in ipa_interconnect_disable()
169 /* Turn on IPA clocks, including interconnects */
170 static int ipa_clock_enable(struct ipa *ipa)  in ipa_clock_enable()  argument
174 	ret = ipa_interconnect_enable(ipa);  in ipa_clock_enable()
178 	ret = clk_prepare_enable(ipa->clock->core);  in ipa_clock_enable()
180 		ipa_interconnect_disable(ipa);  in ipa_clock_enable()
186 static void ipa_clock_disable(struct ipa *ipa)  in ipa_clock_disable()  argument
188 	clk_disable_unprepare(ipa->clock->core);  in ipa_clock_disable()
189 	(void)ipa_interconnect_disable(ipa);  in ipa_clock_disable()
192 /* Get an IPA clock reference, but only if the reference count is
196 bool ipa_clock_get_additional(struct ipa *ipa)  in ipa_clock_get_additional()  argument
198 	return refcount_inc_not_zero(&ipa->clock->count);  in ipa_clock_get_additional()
201 /* Get an IPA clock reference.  If the reference count is non-zero, it is
203  * under protection of the mutex, and if appropriate the IPA clock
209 void ipa_clock_get(struct ipa *ipa)  in ipa_clock_get()  argument
211 	struct ipa_clock *clock = ipa->clock;  in ipa_clock_get()
215 	if (ipa_clock_get_additional(ipa))  in ipa_clock_get()
222 	if (ipa_clock_get_additional(ipa))  in ipa_clock_get()
225 	ret = ipa_clock_enable(ipa);  in ipa_clock_get()
227 		dev_err(&ipa->pdev->dev, "error %d enabling IPA clock\n", ret);  in ipa_clock_get()
237 /* Attempt to remove an IPA clock reference.  If this represents the
238  * last reference, disable the IPA clock under protection of the mutex.
240 void ipa_clock_put(struct ipa *ipa)  in ipa_clock_put()  argument
242 	struct ipa_clock *clock = ipa->clock;  in ipa_clock_put()
248 	ipa_clock_disable(ipa);  in ipa_clock_put()
253 /* Return the current IPA core clock rate */
254 u32 ipa_clock_rate(struct ipa *ipa)  in ipa_clock_rate()  argument
256 	return ipa->clock ? (u32)clk_get_rate(ipa->clock->core) : 0;  in ipa_clock_rate()
259 /* Initialize IPA clocking */