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()
60 	/* For microcontroller interrupts, clear the interrupt right away,  in ipa_interrupt_process()
68 	if (irq_id < IPA_IRQ_COUNT && interrupt->handler[irq_id])  in ipa_interrupt_process()
69 		interrupt->handler[irq_id](interrupt->ipa, irq_id);  in ipa_interrupt_process()
71 	/* Clearing the SUSPEND_TX interrupt also clears the register  in ipa_interrupt_process()
72 	 * that tells us which suspended endpoint(s) caused the interrupt,  in ipa_interrupt_process()
82 	struct ipa_interrupt *interrupt = dev_id;  in ipa_isr_thread()  local
83 	struct ipa *ipa = interrupt->ipa;  in ipa_isr_thread()
84 	u32 enabled = interrupt->enabled;  in ipa_isr_thread()
98 	 * including conditions whose interrupt is not enabled.  Handle  in ipa_isr_thread()
110 			ipa_interrupt_process(interrupt, irq_id);  in ipa_isr_thread()
131 static void ipa_interrupt_suspend_control(struct ipa_interrupt *interrupt,  in ipa_interrupt_suspend_control()  argument
134 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_suspend_control()
142 	/* IPA version 3.0 does not support TX_SUSPEND interrupt control */  in ipa_interrupt_suspend_control()
158 ipa_interrupt_suspend_enable(struct ipa_interrupt *interrupt, u32 endpoint_id)  in ipa_interrupt_suspend_enable()  argument
160 	ipa_interrupt_suspend_control(interrupt, endpoint_id, true);  in ipa_interrupt_suspend_enable()
165 ipa_interrupt_suspend_disable(struct ipa_interrupt *interrupt, u32 endpoint_id)  in ipa_interrupt_suspend_disable()  argument
167 	ipa_interrupt_suspend_control(interrupt, endpoint_id, false);  in ipa_interrupt_suspend_disable()
170 /* Clear the suspend interrupt for all endpoints that signaled it */
171 void ipa_interrupt_suspend_clear_all(struct ipa_interrupt *interrupt)  in ipa_interrupt_suspend_clear_all()  argument
173 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_suspend_clear_all()
180 	/* SUSPEND interrupt status isn't cleared on IPA version 3.0 */  in ipa_interrupt_suspend_clear_all()
188 /* Simulate arrival of an IPA TX_SUSPEND interrupt */
189 void ipa_interrupt_simulate_suspend(struct ipa_interrupt *interrupt)  in ipa_interrupt_simulate_suspend()  argument
191 	ipa_interrupt_process(interrupt, IPA_IRQ_TX_SUSPEND);  in ipa_interrupt_simulate_suspend()
194 /* Add a handler for an IPA interrupt */
195 void ipa_interrupt_add(struct ipa_interrupt *interrupt,  in ipa_interrupt_add()  argument
198 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_add()
204 	interrupt->handler[ipa_irq] = handler;  in ipa_interrupt_add()
206 	/* Update the IPA interrupt mask to enable it */  in ipa_interrupt_add()
207 	interrupt->enabled |= BIT(ipa_irq);  in ipa_interrupt_add()
210 	iowrite32(interrupt->enabled, ipa->reg_virt + ipa_reg_offset(reg));  in ipa_interrupt_add()
213 /* Remove the handler for an IPA interrupt type */
215 ipa_interrupt_remove(struct ipa_interrupt *interrupt, enum ipa_irq_id ipa_irq)  in ipa_interrupt_remove()  argument
217 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_remove()
223 	/* Update the IPA interrupt mask to disable it */  in ipa_interrupt_remove()
224 	interrupt->enabled &= ~BIT(ipa_irq);  in ipa_interrupt_remove()
227 	iowrite32(interrupt->enabled, ipa->reg_virt + ipa_reg_offset(reg));  in ipa_interrupt_remove()
229 	interrupt->handler[ipa_irq] = NULL;  in ipa_interrupt_remove()
232 /* Configure the IPA interrupt framework */
236 	struct ipa_interrupt *interrupt;  in ipa_interrupt_config()  local
249 	interrupt = kzalloc(sizeof(*interrupt), GFP_KERNEL);  in ipa_interrupt_config()
250 	if (!interrupt)  in ipa_interrupt_config()
252 	interrupt->ipa = ipa;  in ipa_interrupt_config()
253 	interrupt->irq = irq;  in ipa_interrupt_config()
260 				   "ipa", interrupt);  in ipa_interrupt_config()
272 	return interrupt;  in ipa_interrupt_config()
275 	free_irq(interrupt->irq, interrupt);  in ipa_interrupt_config()
277 	kfree(interrupt);  in ipa_interrupt_config()
283 void ipa_interrupt_deconfig(struct ipa_interrupt *interrupt)  in ipa_interrupt_deconfig()  argument
285 	struct device *dev = &interrupt->ipa->pdev->dev;  in ipa_interrupt_deconfig()
288 	ret = disable_irq_wake(interrupt->irq);  in ipa_interrupt_deconfig()
291 	free_irq(interrupt->irq, interrupt);  in ipa_interrupt_deconfig()
292 	kfree(interrupt);  in ipa_interrupt_deconfig()