7 /* DOC: IPA Interrupts
9  * The IPA has an interrupt line distinct from the interrupt used by the GSI
11  * transfer completions), IPA interrupts are related to other events related
12  * to the IPA.  Some of the IPA interrupts come from a microcontroller
13  * embedded in the IPA.  Each IPA interrupt type can be both masked and
16  * Two of the IPA interrupts are initiated by the microcontroller.  A third
17  * can be generated to signal the need for a wakeup/resume when an IPA
18  * endpoint has been suspended.  There are other IPA events, but at this
25 #include "ipa.h"
32  * struct ipa_interrupt - IPA interrupt information
33  * @ipa:		IPA pointer
34  * @irq:		Linux IRQ number used for IPA interrupts
36  * @handler:		Array of handlers indexed by IPA interrupt ID
39 	struct ipa *ipa;  member
55 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_process()  local
62 		iowrite32(mask, ipa->reg_virt + IPA_REG_IRQ_CLR_OFFSET);  in ipa_interrupt_process()
65 		interrupt->handler[irq_id](interrupt->ipa, irq_id);  in ipa_interrupt_process()
72 		iowrite32(mask, ipa->reg_virt + IPA_REG_IRQ_CLR_OFFSET);  in ipa_interrupt_process()
75 /* Process all IPA interrupt types that have been signaled */
78 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_process_all()  local
86 	mask = ioread32(ipa->reg_virt + IPA_REG_IRQ_STTS_OFFSET);  in ipa_interrupt_process_all()
95 		mask = ioread32(ipa->reg_virt + IPA_REG_IRQ_STTS_OFFSET);  in ipa_interrupt_process_all()
99 /* Threaded part of the IPA IRQ handler */
104 	ipa_clock_get(interrupt->ipa);  in ipa_isr_thread()
108 	ipa_clock_put(interrupt->ipa);  in ipa_isr_thread()
117 	struct ipa *ipa = interrupt->ipa;  in ipa_isr()  local
120 	mask = ioread32(ipa->reg_virt + IPA_REG_IRQ_STTS_OFFSET);  in ipa_isr()
125 	iowrite32(mask, ipa->reg_virt + IPA_REG_IRQ_CLR_OFFSET);  in ipa_isr()
127 	dev_err(&ipa->pdev->dev, "%s: unexpected interrupt, mask 0x%08x\n",  in ipa_isr()
137 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_suspend_control()  local
141 	/* assert(mask & ipa->available); */  in ipa_interrupt_suspend_control()
142 	val = ioread32(ipa->reg_virt + IPA_REG_SUSPEND_IRQ_EN_OFFSET);  in ipa_interrupt_suspend_control()
147 	iowrite32(val, ipa->reg_virt + IPA_REG_SUSPEND_IRQ_EN_OFFSET);  in ipa_interrupt_suspend_control()
167 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_suspend_clear_all()  local
170 	val = ioread32(ipa->reg_virt + IPA_REG_IRQ_SUSPEND_INFO_OFFSET);  in ipa_interrupt_suspend_clear_all()
171 	iowrite32(val, ipa->reg_virt + IPA_REG_SUSPEND_IRQ_CLR_OFFSET);  in ipa_interrupt_suspend_clear_all()
174 /* Simulate arrival of an IPA TX_SUSPEND interrupt */
180 /* Add a handler for an IPA interrupt */
184 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_add()  local
189 	/* Update the IPA interrupt mask to enable it */  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 */
198 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_remove()  local
201 	/* Update the IPA interrupt mask to disable it */  in ipa_interrupt_remove()
203 	iowrite32(interrupt->enabled, ipa->reg_virt + IPA_REG_IRQ_EN_OFFSET);  in ipa_interrupt_remove()
208 /* Set up the IPA interrupt framework */
209 struct ipa_interrupt *ipa_interrupt_setup(struct ipa *ipa)  in ipa_interrupt_setup()  argument
211 	struct device *dev = &ipa->pdev->dev;  in ipa_interrupt_setup()
216 	ret = platform_get_irq_byname(ipa->pdev, "ipa");  in ipa_interrupt_setup()
218 		dev_err(dev, "DT error %d getting \"ipa\" IRQ property\n",  in ipa_interrupt_setup()
227 	interrupt->ipa = ipa;  in ipa_interrupt_setup()
230 	/* Start with all IPA interrupts disabled */  in ipa_interrupt_setup()
231 	iowrite32(0, ipa->reg_virt + IPA_REG_IRQ_EN_OFFSET);  in ipa_interrupt_setup()
234 				   "ipa", interrupt);  in ipa_interrupt_setup()
236 		dev_err(dev, "error %d requesting \"ipa\" IRQ\n", ret);  in ipa_interrupt_setup()
242 		dev_err(dev, "error %d enabling wakeup for \"ipa\" IRQ\n", ret);  in ipa_interrupt_setup()
256 /* Tear down the IPA interrupt framework */
259 	struct device *dev = &interrupt->ipa->pdev->dev;  in ipa_interrupt_teardown()
264 		dev_err(dev, "error %d disabling \"ipa\" IRQ wakeup\n", ret);  in ipa_interrupt_teardown()