20  * DOC: IPA SMP2P communication with the modem
22  * SMP2P is a primitive communication mechanism available between the AP and
29  * latter case, the modem uses an SMP2P interrupt to tell the AP IPA driver
33  * clock by trigging another SMP2P interrupt to the AP.  We communicate
34  * whether the clock is enabled using two SMP2P state bits--one to
39  * Finally, if the AP kernel panics, we update the SMP2P state bits even if
44  * struct ipa_smp2p - IPA SMP2P information
75  * ipa_smp2p_notify() - use SMP2P to tell modem about IPA clock state
76  * @smp2p:	SMP2P information
80  * (via a panic notifier).  It sets the two SMP2P state bits--one saying
84 static void ipa_smp2p_notify(struct ipa_smp2p *smp2p)  in ipa_smp2p_notify()  argument
89 	if (smp2p->notified)  in ipa_smp2p_notify()
92 	smp2p->clock_on = ipa_clock_get_additional(smp2p->ipa);  in ipa_smp2p_notify()
95 	mask = BIT(smp2p->enabled_bit);  in ipa_smp2p_notify()
96 	value = smp2p->clock_on ? mask : 0;  in ipa_smp2p_notify()
97 	qcom_smem_state_update_bits(smp2p->enabled_state, mask, value);  in ipa_smp2p_notify()
100 	mask = BIT(smp2p->valid_bit);  in ipa_smp2p_notify()
102 	qcom_smem_state_update_bits(smp2p->valid_state, mask, value);  in ipa_smp2p_notify()
104 	smp2p->notified = true;  in ipa_smp2p_notify()
107 /* Threaded IRQ handler for modem "ipa-clock-query" SMP2P interrupt */
110 	struct ipa_smp2p *smp2p = dev_id;  in ipa_smp2p_modem_clk_query_isr()  local
112 	ipa_smp2p_notify(smp2p);  in ipa_smp2p_modem_clk_query_isr()
120 	struct ipa_smp2p *smp2p;  in ipa_smp2p_panic_notifier()  local
122 	smp2p = container_of(nb, struct ipa_smp2p, panic_notifier);  in ipa_smp2p_panic_notifier()
124 	ipa_smp2p_notify(smp2p);  in ipa_smp2p_panic_notifier()
126 	if (smp2p->clock_on)  in ipa_smp2p_panic_notifier()
127 		ipa_uc_panic_notifier(smp2p->ipa);  in ipa_smp2p_panic_notifier()
132 static int ipa_smp2p_panic_notifier_register(struct ipa_smp2p *smp2p)  in ipa_smp2p_panic_notifier_register()  argument
135 	smp2p->panic_notifier.notifier_call = ipa_smp2p_panic_notifier;  in ipa_smp2p_panic_notifier_register()
136 	smp2p->panic_notifier.priority = INT_MAX;	/* Do it early */  in ipa_smp2p_panic_notifier_register()
139 					      &smp2p->panic_notifier);  in ipa_smp2p_panic_notifier_register()
142 static void ipa_smp2p_panic_notifier_unregister(struct ipa_smp2p *smp2p)  in ipa_smp2p_panic_notifier_unregister()  argument
145 					 &smp2p->panic_notifier);  in ipa_smp2p_panic_notifier_unregister()
148 /* Threaded IRQ handler for modem "ipa-setup-ready" SMP2P interrupt */
151 	struct ipa_smp2p *smp2p = dev_id;  in ipa_smp2p_modem_setup_ready_isr()  local
153 	mutex_lock(&smp2p->mutex);  in ipa_smp2p_modem_setup_ready_isr()
155 	if (!smp2p->disabled) {  in ipa_smp2p_modem_setup_ready_isr()
158 		ret = ipa_setup(smp2p->ipa);  in ipa_smp2p_modem_setup_ready_isr()
160 			dev_err(&smp2p->ipa->pdev->dev,  in ipa_smp2p_modem_setup_ready_isr()
162 		smp2p->disabled = true;  in ipa_smp2p_modem_setup_ready_isr()
165 	mutex_unlock(&smp2p->mutex);  in ipa_smp2p_modem_setup_ready_isr()
170 /* Initialize SMP2P interrupts */
171 static int ipa_smp2p_irq_init(struct ipa_smp2p *smp2p, const char *name,  in ipa_smp2p_irq_init()  argument
174 	struct device *dev = &smp2p->ipa->pdev->dev;  in ipa_smp2p_irq_init()
178 	ret = platform_get_irq_byname(smp2p->ipa->pdev, name);  in ipa_smp2p_irq_init()
186 	ret = request_threaded_irq(irq, NULL, handler, 0, name, smp2p);  in ipa_smp2p_irq_init()
195 static void ipa_smp2p_irq_exit(struct ipa_smp2p *smp2p, u32 irq)  in ipa_smp2p_irq_exit()  argument
197 	free_irq(irq, smp2p);  in ipa_smp2p_irq_exit()
203 	if (!ipa->smp2p->clock_on)  in ipa_smp2p_clock_release()
207 	ipa->smp2p->clock_on = false;  in ipa_smp2p_clock_release()
210 /* Initialize the IPA SMP2P subsystem */
216 	struct ipa_smp2p *smp2p;  in ipa_smp2p_init()  local
235 	smp2p = kzalloc(sizeof(*smp2p), GFP_KERNEL);  in ipa_smp2p_init()
236 	if (!smp2p)  in ipa_smp2p_init()
239 	smp2p->ipa = ipa;  in ipa_smp2p_init()
244 	mutex_init(&smp2p->mutex);  in ipa_smp2p_init()
245 	smp2p->valid_state = valid_state;  in ipa_smp2p_init()
246 	smp2p->valid_bit = valid_bit;  in ipa_smp2p_init()
247 	smp2p->enabled_state = enabled_state;  in ipa_smp2p_init()
248 	smp2p->enabled_bit = enabled_bit;  in ipa_smp2p_init()
251 	ipa->smp2p = smp2p;  in ipa_smp2p_init()
253 	ret = ipa_smp2p_irq_init(smp2p, "ipa-clock-query",  in ipa_smp2p_init()
257 	smp2p->clock_query_irq = ret;  in ipa_smp2p_init()
259 	ret = ipa_smp2p_panic_notifier_register(smp2p);  in ipa_smp2p_init()
265 		ret = ipa_smp2p_irq_init(smp2p, "ipa-setup-ready",  in ipa_smp2p_init()
269 		smp2p->setup_ready_irq = ret;  in ipa_smp2p_init()
275 	ipa_smp2p_panic_notifier_unregister(smp2p);  in ipa_smp2p_init()
277 	ipa_smp2p_irq_exit(smp2p, smp2p->clock_query_irq);  in ipa_smp2p_init()
279 	ipa->smp2p = NULL;  in ipa_smp2p_init()
280 	mutex_destroy(&smp2p->mutex);  in ipa_smp2p_init()
281 	kfree(smp2p);  in ipa_smp2p_init()
288 	struct ipa_smp2p *smp2p = ipa->smp2p;  in ipa_smp2p_exit()  local
290 	if (smp2p->setup_ready_irq)  in ipa_smp2p_exit()
291 		ipa_smp2p_irq_exit(smp2p, smp2p->setup_ready_irq);  in ipa_smp2p_exit()
292 	ipa_smp2p_panic_notifier_unregister(smp2p);  in ipa_smp2p_exit()
293 	ipa_smp2p_irq_exit(smp2p, smp2p->clock_query_irq);  in ipa_smp2p_exit()
296 	ipa->smp2p = NULL;  in ipa_smp2p_exit()
297 	mutex_destroy(&smp2p->mutex);  in ipa_smp2p_exit()
298 	kfree(smp2p);  in ipa_smp2p_exit()
303 	struct ipa_smp2p *smp2p = ipa->smp2p;  in ipa_smp2p_disable()  local
305 	if (!smp2p->setup_ready_irq)  in ipa_smp2p_disable()
308 	mutex_lock(&smp2p->mutex);  in ipa_smp2p_disable()
310 	smp2p->disabled = true;  in ipa_smp2p_disable()
312 	mutex_unlock(&smp2p->mutex);  in ipa_smp2p_disable()
318 	struct ipa_smp2p *smp2p = ipa->smp2p;  in ipa_smp2p_notify_reset()  local
321 	if (!smp2p->notified)  in ipa_smp2p_notify_reset()
327 	mask = BIT(smp2p->valid_bit);  in ipa_smp2p_notify_reset()
328 	qcom_smem_state_update_bits(smp2p->valid_state, mask, 0);  in ipa_smp2p_notify_reset()
331 	mask = BIT(smp2p->enabled_bit);  in ipa_smp2p_notify_reset()
332 	qcom_smem_state_update_bits(smp2p->enabled_state, mask, 0);  in ipa_smp2p_notify_reset()
334 	smp2p->notified = false;  in ipa_smp2p_notify_reset()