9  * The IPA has an interrupt line distinct from the interrupt used by the GSI
13  * embedded in the IPA.  Each IPA interrupt type can be both masked and
23 #include <linux/interrupt.h>
32  * struct ipa_interrupt - IPA interrupt information
36  * @handler:		Array of handlers indexed by IPA interrupt ID
45 /* Returns true if the interrupt type is associated with the microcontroller */
46 static bool ipa_interrupt_uc(struct ipa_interrupt *interrupt, u32 irq_id)  in ipa_interrupt_uc()  argument
51 /* Process a particular interrupt type that has been received */
52 static void ipa_interrupt_process(struct ipa_interrupt *interrupt, u32 irq_id)  in ipa_interrupt_process()  argument
54 	bool uc_irq = ipa_interrupt_uc(interrupt, irq_id);  in ipa_interrupt_process()
55 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_process()
58 	/* For microcontroller interrupts, clear the interrupt right away,  in ipa_interrupt_process()
64 	if (irq_id < IPA_IRQ_COUNT && interrupt->handler[irq_id])  in ipa_interrupt_process()
65 		interrupt->handler[irq_id](interrupt->ipa, irq_id);  in ipa_interrupt_process()
67 	/* Clearing the SUSPEND_TX interrupt also clears the register  in ipa_interrupt_process()
68 	 * that tells us which suspended endpoint(s) caused the interrupt,  in ipa_interrupt_process()
75 /* Process all IPA interrupt types that have been signaled */
76 static void ipa_interrupt_process_all(struct ipa_interrupt *interrupt)  in ipa_interrupt_process_all()  argument
78 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_process_all()
79 	u32 enabled = interrupt->enabled;  in ipa_interrupt_process_all()
83 	 * including conditions whose interrupt is not enabled.  Handle  in ipa_interrupt_process_all()
93 			ipa_interrupt_process(interrupt, irq_id);  in ipa_interrupt_process_all()
102 	struct ipa_interrupt *interrupt = dev_id;  in ipa_isr_thread()  local
104 	ipa_clock_get(interrupt->ipa);  in ipa_isr_thread()
106 	ipa_interrupt_process_all(interrupt);  in ipa_isr_thread()
108 	ipa_clock_put(interrupt->ipa);  in ipa_isr_thread()
116 	struct ipa_interrupt *interrupt = dev_id;  in ipa_isr()  local
117 	struct ipa *ipa = interrupt->ipa;  in ipa_isr()
121 	if (mask & interrupt->enabled)  in ipa_isr()
124 	/* Nothing in the mask was supposed to cause an interrupt */  in ipa_isr()
127 	dev_err(&ipa->pdev->dev, "%s: unexpected interrupt, mask 0x%08x\n",  in ipa_isr()
134 static void ipa_interrupt_suspend_control(struct ipa_interrupt *interrupt,  in ipa_interrupt_suspend_control()  argument
137 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_suspend_control()
152 ipa_interrupt_suspend_enable(struct ipa_interrupt *interrupt, u32 endpoint_id)  in ipa_interrupt_suspend_enable()  argument
154 	ipa_interrupt_suspend_control(interrupt, endpoint_id, true);  in ipa_interrupt_suspend_enable()
159 ipa_interrupt_suspend_disable(struct ipa_interrupt *interrupt, u32 endpoint_id)  in ipa_interrupt_suspend_disable()  argument
161 	ipa_interrupt_suspend_control(interrupt, endpoint_id, false);  in ipa_interrupt_suspend_disable()
164 /* Clear the suspend interrupt for all endpoints that signaled it */
165 void ipa_interrupt_suspend_clear_all(struct ipa_interrupt *interrupt)  in ipa_interrupt_suspend_clear_all()  argument
167 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_suspend_clear_all()
174 /* Simulate arrival of an IPA TX_SUSPEND interrupt */
175 void ipa_interrupt_simulate_suspend(struct ipa_interrupt *interrupt)  in ipa_interrupt_simulate_suspend()  argument
177 	ipa_interrupt_process(interrupt, IPA_IRQ_TX_SUSPEND);  in ipa_interrupt_simulate_suspend()
180 /* Add a handler for an IPA interrupt */
181 void ipa_interrupt_add(struct ipa_interrupt *interrupt,  in ipa_interrupt_add()  argument
184 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_add()
187 	interrupt->handler[ipa_irq] = handler;  in ipa_interrupt_add()
189 	/* Update the IPA interrupt mask to enable it */  in ipa_interrupt_add()
190 	interrupt->enabled |= BIT(ipa_irq);  in ipa_interrupt_add()
191 	iowrite32(interrupt->enabled, ipa->reg_virt + IPA_REG_IRQ_EN_OFFSET);  in ipa_interrupt_add()
194 /* Remove the handler for an IPA interrupt type */
196 ipa_interrupt_remove(struct ipa_interrupt *interrupt, enum ipa_irq_id ipa_irq)  in ipa_interrupt_remove()  argument
198 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_remove()
201 	/* Update the IPA interrupt mask to disable it */  in ipa_interrupt_remove()
202 	interrupt->enabled &= ~BIT(ipa_irq);  in ipa_interrupt_remove()
203 	iowrite32(interrupt->enabled, ipa->reg_virt + IPA_REG_IRQ_EN_OFFSET);  in ipa_interrupt_remove()
205 	interrupt->handler[ipa_irq] = NULL;  in ipa_interrupt_remove()
208 /* Set up the IPA interrupt framework */
212 	struct ipa_interrupt *interrupt;  in ipa_interrupt_setup()  local
224 	interrupt = kzalloc(sizeof(*interrupt), GFP_KERNEL);  in ipa_interrupt_setup()
225 	if (!interrupt)  in ipa_interrupt_setup()
227 	interrupt->ipa = ipa;  in ipa_interrupt_setup()
228 	interrupt->irq = irq;  in ipa_interrupt_setup()
234 				   "ipa", interrupt);  in ipa_interrupt_setup()
246 	return interrupt;  in ipa_interrupt_setup()
249 	free_irq(interrupt->irq, interrupt);  in ipa_interrupt_setup()
251 	kfree(interrupt);  in ipa_interrupt_setup()
256 /* Tear down the IPA interrupt framework */
257 void ipa_interrupt_teardown(struct ipa_interrupt *interrupt)  in ipa_interrupt_teardown()  argument
259 	struct device *dev = &interrupt->ipa->pdev->dev;  in ipa_interrupt_teardown()
262 	ret = disable_irq_wake(interrupt->irq);  in ipa_interrupt_teardown()
265 	free_irq(interrupt->irq, interrupt);  in ipa_interrupt_teardown()
266 	kfree(interrupt);  in ipa_interrupt_teardown()