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
26 #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 	offset = ipa_reg_irq_clr_offset(ipa->version);  in ipa_interrupt_process()
64 		iowrite32(mask, ipa->reg_virt + offset);  in ipa_interrupt_process()
67 		interrupt->handler[irq_id](interrupt->ipa, irq_id);  in ipa_interrupt_process()
74 		iowrite32(mask, ipa->reg_virt + offset);  in ipa_interrupt_process()
77 /* IPA IRQ handler is threaded */
81 	struct ipa *ipa = interrupt->ipa;  in ipa_isr_thread()  local
89 	dev = &ipa->pdev->dev;  in ipa_isr_thread()
98 	offset = ipa_reg_irq_stts_offset(ipa->version);  in ipa_isr_thread()
99 	pending = ioread32(ipa->reg_virt + offset);  in ipa_isr_thread()
108 		pending = ioread32(ipa->reg_virt + offset);  in ipa_isr_thread()
113 		dev_dbg(dev, "clearing disabled IPA interrupts 0x%08x\n",  in ipa_isr_thread()
115 		offset = ipa_reg_irq_clr_offset(ipa->version);  in ipa_isr_thread()
116 		iowrite32(pending, ipa->reg_virt + offset);  in ipa_isr_thread()
129 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_suspend_control()  local
134 	WARN_ON(!(mask & ipa->available));  in ipa_interrupt_suspend_control()
136 	/* IPA version 3.0 does not support TX_SUSPEND interrupt control */  in ipa_interrupt_suspend_control()
137 	if (ipa->version == IPA_VERSION_3_0)  in ipa_interrupt_suspend_control()
140 	offset = ipa_reg_irq_suspend_en_offset(ipa->version);  in ipa_interrupt_suspend_control()
141 	val = ioread32(ipa->reg_virt + offset);  in ipa_interrupt_suspend_control()
146 	iowrite32(val, ipa->reg_virt + offset);  in ipa_interrupt_suspend_control()
166 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_suspend_clear_all()  local
170 	offset = ipa_reg_irq_suspend_info_offset(ipa->version);  in ipa_interrupt_suspend_clear_all()
171 	val = ioread32(ipa->reg_virt + offset);  in ipa_interrupt_suspend_clear_all()
173 	/* SUSPEND interrupt status isn't cleared on IPA version 3.0 */  in ipa_interrupt_suspend_clear_all()
174 	if (ipa->version == IPA_VERSION_3_0)  in ipa_interrupt_suspend_clear_all()
177 	offset = ipa_reg_irq_suspend_clr_offset(ipa->version);  in ipa_interrupt_suspend_clear_all()
178 	iowrite32(val, ipa->reg_virt + offset);  in ipa_interrupt_suspend_clear_all()
181 /* Simulate arrival of an IPA TX_SUSPEND interrupt */
187 /* Add a handler for an IPA interrupt */
191 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_add()  local
198 	/* Update the IPA interrupt mask to enable it */  in ipa_interrupt_add()
200 	offset = ipa_reg_irq_en_offset(ipa->version);  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 */
208 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_remove()  local
213 	/* Update the IPA interrupt mask to disable it */  in ipa_interrupt_remove()
215 	offset = ipa_reg_irq_en_offset(ipa->version);  in ipa_interrupt_remove()
216 	iowrite32(interrupt->enabled, ipa->reg_virt + offset);  in ipa_interrupt_remove()
221 /* Configure the IPA interrupt framework */
222 struct ipa_interrupt *ipa_interrupt_config(struct ipa *ipa)  in ipa_interrupt_config()  argument
224 	struct device *dev = &ipa->pdev->dev;  in ipa_interrupt_config()
230 	ret = platform_get_irq_byname(ipa->pdev, "ipa");  in ipa_interrupt_config()
232 		dev_err(dev, "DT error %d getting \"ipa\" IRQ property\n",  in ipa_interrupt_config()
241 	interrupt->ipa = ipa;  in ipa_interrupt_config()
244 	/* Start with all IPA interrupts disabled */  in ipa_interrupt_config()
245 	offset = ipa_reg_irq_en_offset(ipa->version);  in ipa_interrupt_config()
246 	iowrite32(0, ipa->reg_virt + offset);  in ipa_interrupt_config()
249 				   "ipa", interrupt);  in ipa_interrupt_config()
251 		dev_err(dev, "error %d requesting \"ipa\" IRQ\n", ret);  in ipa_interrupt_config()
257 		dev_err(dev, "error %d enabling wakeup for \"ipa\" IRQ\n", ret);  in ipa_interrupt_config()
274 	struct device *dev = &interrupt->ipa->pdev->dev;  in ipa_interrupt_deconfig()
279 		dev_err(dev, "error %d disabling \"ipa\" IRQ wakeup\n", ret);  in ipa_interrupt_deconfig()