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()
59 	/* For microcontroller interrupts, clear the interrupt right away,  in ipa_interrupt_process()
66 	if (irq_id < IPA_IRQ_COUNT && interrupt->handler[irq_id])  in ipa_interrupt_process()
67 		interrupt->handler[irq_id](interrupt->ipa, irq_id);  in ipa_interrupt_process()
69 	/* Clearing the SUSPEND_TX interrupt also clears the register  in ipa_interrupt_process()
70 	 * that tells us which suspended endpoint(s) caused the interrupt,  in ipa_interrupt_process()
80 	struct ipa_interrupt *interrupt = dev_id;  in ipa_isr_thread()  local
81 	struct ipa *ipa = interrupt->ipa;  in ipa_isr_thread()
82 	u32 enabled = interrupt->enabled;  in ipa_isr_thread()
95 	 * including conditions whose interrupt is not enabled.  Handle  in ipa_isr_thread()
106 			ipa_interrupt_process(interrupt, irq_id);  in ipa_isr_thread()
126 static void ipa_interrupt_suspend_control(struct ipa_interrupt *interrupt,  in ipa_interrupt_suspend_control()  argument
129 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_suspend_control()
136 	/* IPA version 3.0 does not support TX_SUSPEND interrupt control */  in ipa_interrupt_suspend_control()
151 ipa_interrupt_suspend_enable(struct ipa_interrupt *interrupt, u32 endpoint_id)  in ipa_interrupt_suspend_enable()  argument
153 	ipa_interrupt_suspend_control(interrupt, endpoint_id, true);  in ipa_interrupt_suspend_enable()
158 ipa_interrupt_suspend_disable(struct ipa_interrupt *interrupt, u32 endpoint_id)  in ipa_interrupt_suspend_disable()  argument
160 	ipa_interrupt_suspend_control(interrupt, endpoint_id, false);  in ipa_interrupt_suspend_disable()
163 /* Clear the suspend interrupt for all endpoints that signaled it */
164 void ipa_interrupt_suspend_clear_all(struct ipa_interrupt *interrupt)  in ipa_interrupt_suspend_clear_all()  argument
166 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_suspend_clear_all()
173 	/* SUSPEND interrupt status isn't cleared on IPA version 3.0 */  in ipa_interrupt_suspend_clear_all()
181 /* Simulate arrival of an IPA TX_SUSPEND interrupt */
182 void ipa_interrupt_simulate_suspend(struct ipa_interrupt *interrupt)  in ipa_interrupt_simulate_suspend()  argument
184 	ipa_interrupt_process(interrupt, IPA_IRQ_TX_SUSPEND);  in ipa_interrupt_simulate_suspend()
187 /* Add a handler for an IPA interrupt */
188 void ipa_interrupt_add(struct ipa_interrupt *interrupt,  in ipa_interrupt_add()  argument
191 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_add()
196 	interrupt->handler[ipa_irq] = handler;  in ipa_interrupt_add()
198 	/* Update the IPA interrupt mask to enable it */  in ipa_interrupt_add()
199 	interrupt->enabled |= BIT(ipa_irq);  in ipa_interrupt_add()
201 	iowrite32(interrupt->enabled, ipa->reg_virt + offset);  in ipa_interrupt_add()
204 /* Remove the handler for an IPA interrupt type */
206 ipa_interrupt_remove(struct ipa_interrupt *interrupt, enum ipa_irq_id ipa_irq)  in ipa_interrupt_remove()  argument
208 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_remove()
213 	/* Update the IPA interrupt mask to disable it */  in ipa_interrupt_remove()
214 	interrupt->enabled &= ~BIT(ipa_irq);  in ipa_interrupt_remove()
216 	iowrite32(interrupt->enabled, ipa->reg_virt + offset);  in ipa_interrupt_remove()
218 	interrupt->handler[ipa_irq] = NULL;  in ipa_interrupt_remove()
221 /* Configure the IPA interrupt framework */
225 	struct ipa_interrupt *interrupt;  in ipa_interrupt_config()  local
238 	interrupt = kzalloc(sizeof(*interrupt), GFP_KERNEL);  in ipa_interrupt_config()
239 	if (!interrupt)  in ipa_interrupt_config()
241 	interrupt->ipa = ipa;  in ipa_interrupt_config()
242 	interrupt->irq = irq;  in ipa_interrupt_config()
249 				   "ipa", interrupt);  in ipa_interrupt_config()
261 	return interrupt;  in ipa_interrupt_config()
264 	free_irq(interrupt->irq, interrupt);  in ipa_interrupt_config()
266 	kfree(interrupt);  in ipa_interrupt_config()
272 void ipa_interrupt_deconfig(struct ipa_interrupt *interrupt)  in ipa_interrupt_deconfig()  argument
274 	struct device *dev = &interrupt->ipa->pdev->dev;  in ipa_interrupt_deconfig()
277 	ret = disable_irq_wake(interrupt->irq);  in ipa_interrupt_deconfig()
280 	free_irq(interrupt->irq, interrupt);  in ipa_interrupt_deconfig()
281 	kfree(interrupt);  in ipa_interrupt_deconfig()