21  * DOC: IPA SMP2P communication with the modem
23  * SMP2P is a primitive communication mechanism available between the AP and
30  * latter case, the modem uses an SMP2P interrupt to tell the AP IPA driver
34  * power by trigging another SMP2P interrupt to the AP.  We communicate
35  * whether power is enabled using two SMP2P state bits--one to indicate
40  * Finally, if the AP kernel panics, we update the SMP2P state bits even if
45  * struct ipa_smp2p - IPA SMP2P information
76  * ipa_smp2p_notify() - use SMP2P to tell modem about IPA power state
77  * @smp2p:	SMP2P information
81  * (via a panic notifier).  It sets the two SMP2P state bits--one saying
85 static void ipa_smp2p_notify(struct ipa_smp2p *smp2p)  in ipa_smp2p_notify()  argument
90 	if (smp2p->notified)  in ipa_smp2p_notify()
93 	smp2p->power_on = pm_runtime_get_if_active(smp2p->ipa->dev) > 0;  in ipa_smp2p_notify()
96 	mask = BIT(smp2p->enabled_bit);  in ipa_smp2p_notify()
97 	value = smp2p->power_on ? mask : 0;  in ipa_smp2p_notify()
98 	qcom_smem_state_update_bits(smp2p->enabled_state, mask, value);  in ipa_smp2p_notify()
101 	mask = BIT(smp2p->valid_bit);  in ipa_smp2p_notify()
103 	qcom_smem_state_update_bits(smp2p->valid_state, mask, value);  in ipa_smp2p_notify()
105 	smp2p->notified = true;  in ipa_smp2p_notify()
108 /* Threaded IRQ handler for modem "ipa-clock-query" SMP2P interrupt */
111 	struct ipa_smp2p *smp2p = dev_id;  in ipa_smp2p_modem_clk_query_isr()  local
113 	ipa_smp2p_notify(smp2p);  in ipa_smp2p_modem_clk_query_isr()
121 	struct ipa_smp2p *smp2p;  in ipa_smp2p_panic_notifier()  local
123 	smp2p = container_of(nb, struct ipa_smp2p, panic_notifier);  in ipa_smp2p_panic_notifier()
125 	ipa_smp2p_notify(smp2p);  in ipa_smp2p_panic_notifier()
127 	if (smp2p->power_on)  in ipa_smp2p_panic_notifier()
128 		ipa_uc_panic_notifier(smp2p->ipa);  in ipa_smp2p_panic_notifier()
133 static int ipa_smp2p_panic_notifier_register(struct ipa_smp2p *smp2p)  in ipa_smp2p_panic_notifier_register()  argument
136 	smp2p->panic_notifier.notifier_call = ipa_smp2p_panic_notifier;  in ipa_smp2p_panic_notifier_register()
137 	smp2p->panic_notifier.priority = INT_MAX;	/* Do it early */  in ipa_smp2p_panic_notifier_register()
140 					      &smp2p->panic_notifier);  in ipa_smp2p_panic_notifier_register()
143 static void ipa_smp2p_panic_notifier_unregister(struct ipa_smp2p *smp2p)  in ipa_smp2p_panic_notifier_unregister()  argument
146 					 &smp2p->panic_notifier);  in ipa_smp2p_panic_notifier_unregister()
149 /* Threaded IRQ handler for modem "ipa-setup-ready" SMP2P interrupt */
152 	struct ipa_smp2p *smp2p = dev_id;  in ipa_smp2p_modem_setup_ready_isr()  local
153 	struct ipa *ipa = smp2p->ipa;  in ipa_smp2p_modem_setup_ready_isr()
180 /* Initialize SMP2P interrupts */
181 static int ipa_smp2p_irq_init(struct ipa_smp2p *smp2p,  in ipa_smp2p_irq_init()  argument
194 	ret = request_threaded_irq(irq, NULL, handler, 0, name, smp2p);  in ipa_smp2p_irq_init()
203 static void ipa_smp2p_irq_exit(struct ipa_smp2p *smp2p, u32 irq)  in ipa_smp2p_irq_exit()  argument
205 	free_irq(irq, smp2p);  in ipa_smp2p_irq_exit()
213 	if (!ipa->smp2p->power_on)  in ipa_smp2p_power_release()
218 	ipa->smp2p->power_on = false;  in ipa_smp2p_power_release()
221 /* Initialize the IPA SMP2P subsystem */
228 	struct ipa_smp2p *smp2p;  in ipa_smp2p_init()  local
247 	smp2p = kzalloc(sizeof(*smp2p), GFP_KERNEL);  in ipa_smp2p_init()
248 	if (!smp2p)  in ipa_smp2p_init()
251 	smp2p->ipa = ipa;  in ipa_smp2p_init()
256 	mutex_init(&smp2p->mutex);  in ipa_smp2p_init()
257 	smp2p->valid_state = valid_state;  in ipa_smp2p_init()
258 	smp2p->valid_bit = valid_bit;  in ipa_smp2p_init()
259 	smp2p->enabled_state = enabled_state;  in ipa_smp2p_init()
260 	smp2p->enabled_bit = enabled_bit;  in ipa_smp2p_init()
263 	ipa->smp2p = smp2p;  in ipa_smp2p_init()
265 	ret = ipa_smp2p_irq_init(smp2p, pdev, "ipa-clock-query",  in ipa_smp2p_init()
269 	smp2p->clock_query_irq = ret;  in ipa_smp2p_init()
271 	ret = ipa_smp2p_panic_notifier_register(smp2p);  in ipa_smp2p_init()
277 		ret = ipa_smp2p_irq_init(smp2p, pdev, "ipa-setup-ready",  in ipa_smp2p_init()
281 		smp2p->setup_ready_irq = ret;  in ipa_smp2p_init()
287 	ipa_smp2p_panic_notifier_unregister(smp2p);  in ipa_smp2p_init()
289 	ipa_smp2p_irq_exit(smp2p, smp2p->clock_query_irq);  in ipa_smp2p_init()
291 	ipa->smp2p = NULL;  in ipa_smp2p_init()
292 	mutex_destroy(&smp2p->mutex);  in ipa_smp2p_init()
293 	kfree(smp2p);  in ipa_smp2p_init()
300 	struct ipa_smp2p *smp2p = ipa->smp2p;  in ipa_smp2p_exit()  local
302 	if (smp2p->setup_ready_irq)  in ipa_smp2p_exit()
303 		ipa_smp2p_irq_exit(smp2p, smp2p->setup_ready_irq);  in ipa_smp2p_exit()
304 	ipa_smp2p_panic_notifier_unregister(smp2p);  in ipa_smp2p_exit()
305 	ipa_smp2p_irq_exit(smp2p, smp2p->clock_query_irq);  in ipa_smp2p_exit()
308 	ipa->smp2p = NULL;  in ipa_smp2p_exit()
309 	mutex_destroy(&smp2p->mutex);  in ipa_smp2p_exit()
310 	kfree(smp2p);  in ipa_smp2p_exit()
315 	struct ipa_smp2p *smp2p = ipa->smp2p;  in ipa_smp2p_irq_disable_setup()  local
317 	if (!smp2p->setup_ready_irq)  in ipa_smp2p_irq_disable_setup()
320 	mutex_lock(&smp2p->mutex);  in ipa_smp2p_irq_disable_setup()
322 	if (!smp2p->setup_disabled) {  in ipa_smp2p_irq_disable_setup()
323 		disable_irq(smp2p->setup_ready_irq);  in ipa_smp2p_irq_disable_setup()
324 		smp2p->setup_disabled = true;  in ipa_smp2p_irq_disable_setup()
327 	mutex_unlock(&smp2p->mutex);  in ipa_smp2p_irq_disable_setup()
333 	struct ipa_smp2p *smp2p = ipa->smp2p;  in ipa_smp2p_notify_reset()  local
336 	if (!smp2p->notified)  in ipa_smp2p_notify_reset()
342 	mask = BIT(smp2p->valid_bit);  in ipa_smp2p_notify_reset()
343 	qcom_smem_state_update_bits(smp2p->valid_state, mask, 0);  in ipa_smp2p_notify_reset()
346 	mask = BIT(smp2p->enabled_bit);  in ipa_smp2p_notify_reset()
347 	qcom_smem_state_update_bits(smp2p->enabled_state, mask, 0);  in ipa_smp2p_notify_reset()
349 	smp2p->notified = false;  in ipa_smp2p_notify_reset()