1 // SPDX-License-Identifier: GPL-2.0
3 /* Copyright (c) 2014-2018, The Linux Foundation. All rights reserved.
4  * Copyright (C) 2018-2022 Linaro Ltd.
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
27 #include "ipa.h"
35  * struct ipa_interrupt - IPA interrupt information
36  * @ipa:		IPA pointer
37  * @irq:		Linux IRQ number used for IPA interrupts
41 	struct ipa *ipa;  member
49 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_process()  local
50 	const struct reg *reg;  in ipa_interrupt_process()  local
54 	reg = ipa_reg(ipa, IPA_IRQ_CLR);  in ipa_interrupt_process()
55 	offset = reg_offset(reg);  in ipa_interrupt_process()
63 		iowrite32(mask, ipa->reg_virt + offset);  in ipa_interrupt_process()
64 		ipa_uc_interrupt_handler(ipa, irq_id);  in ipa_interrupt_process()
73 		ipa_power_suspend_handler(ipa, irq_id);  in ipa_interrupt_process()
77 		iowrite32(mask, ipa->reg_virt + offset);  in ipa_interrupt_process()
82 /* IPA IRQ handler is threaded */
86 	struct ipa *ipa = interrupt->ipa;  in ipa_isr_thread()  local
87 	u32 enabled = interrupt->enabled;  in ipa_isr_thread()
88 	const struct reg *reg;  in ipa_isr_thread()  local
95 	dev = &ipa->pdev->dev;  in ipa_isr_thread()
104 	reg = ipa_reg(ipa, IPA_IRQ_STTS);  in ipa_isr_thread()
105 	offset = reg_offset(reg);  in ipa_isr_thread()
106 	pending = ioread32(ipa->reg_virt + offset);  in ipa_isr_thread()
115 		pending = ioread32(ipa->reg_virt + offset);  in ipa_isr_thread()
120 		dev_dbg(dev, "clearing disabled IPA interrupts 0x%08x\n",  in ipa_isr_thread()
122 		reg = ipa_reg(ipa, IPA_IRQ_CLR);  in ipa_isr_thread()
123 		iowrite32(pending, ipa->reg_virt + reg_offset(reg));  in ipa_isr_thread()
132 static void ipa_interrupt_enabled_update(struct ipa *ipa)  in ipa_interrupt_enabled_update()  argument
134 	const struct reg *reg = ipa_reg(ipa, IPA_IRQ_EN);  in ipa_interrupt_enabled_update()  local
136 	iowrite32(ipa->interrupt->enabled, ipa->reg_virt + reg_offset(reg));  in ipa_interrupt_enabled_update()
139 /* Enable an IPA interrupt type */
140 void ipa_interrupt_enable(struct ipa *ipa, enum ipa_irq_id ipa_irq)  in ipa_interrupt_enable()  argument
142 	/* Update the IPA interrupt mask to enable it */  in ipa_interrupt_enable()
143 	ipa->interrupt->enabled |= BIT(ipa_irq);  in ipa_interrupt_enable()
144 	ipa_interrupt_enabled_update(ipa);  in ipa_interrupt_enable()
147 /* Disable an IPA interrupt type */
148 void ipa_interrupt_disable(struct ipa *ipa, enum ipa_irq_id ipa_irq)  in ipa_interrupt_disable()  argument
150 	/* Update the IPA interrupt mask to disable it */  in ipa_interrupt_disable()
151 	ipa->interrupt->enabled &= ~BIT(ipa_irq);  in ipa_interrupt_disable()
152 	ipa_interrupt_enabled_update(ipa);  in ipa_interrupt_disable()
155 void ipa_interrupt_irq_disable(struct ipa *ipa)  in ipa_interrupt_irq_disable()  argument
157 	disable_irq(ipa->interrupt->irq);  in ipa_interrupt_irq_disable()
160 void ipa_interrupt_irq_enable(struct ipa *ipa)  in ipa_interrupt_irq_enable()  argument
162 	enable_irq(ipa->interrupt->irq);  in ipa_interrupt_irq_enable()
169 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_suspend_control()  local
172 	const struct reg *reg;  in ipa_interrupt_suspend_control()  local
176 	WARN_ON(!test_bit(endpoint_id, ipa->available));  in ipa_interrupt_suspend_control()
178 	/* IPA version 3.0 does not support TX_SUSPEND interrupt control */  in ipa_interrupt_suspend_control()
179 	if (ipa->version == IPA_VERSION_3_0)  in ipa_interrupt_suspend_control()
182 	reg = ipa_reg(ipa, IRQ_SUSPEND_EN);  in ipa_interrupt_suspend_control()
183 	offset = reg_n_offset(reg, unit);  in ipa_interrupt_suspend_control()
184 	val = ioread32(ipa->reg_virt + offset);  in ipa_interrupt_suspend_control()
191 	iowrite32(val, ipa->reg_virt + offset);  in ipa_interrupt_suspend_control()
211 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_suspend_clear_all()  local
215 	unit_count = DIV_ROUND_UP(ipa->endpoint_count, 32);  in ipa_interrupt_suspend_clear_all()
217 		const struct reg *reg;  in ipa_interrupt_suspend_clear_all()  local
220 		reg = ipa_reg(ipa, IRQ_SUSPEND_INFO);  in ipa_interrupt_suspend_clear_all()
221 		val = ioread32(ipa->reg_virt + reg_n_offset(reg, unit));  in ipa_interrupt_suspend_clear_all()
223 		/* SUSPEND interrupt status isn't cleared on IPA version 3.0 */  in ipa_interrupt_suspend_clear_all()
224 		if (ipa->version == IPA_VERSION_3_0)  in ipa_interrupt_suspend_clear_all()
227 		reg = ipa_reg(ipa, IRQ_SUSPEND_CLR);  in ipa_interrupt_suspend_clear_all()
228 		iowrite32(val, ipa->reg_virt + reg_n_offset(reg, unit));  in ipa_interrupt_suspend_clear_all()
232 /* Simulate arrival of an IPA TX_SUSPEND interrupt */
238 /* Configure the IPA interrupt framework */
239 struct ipa_interrupt *ipa_interrupt_config(struct ipa *ipa)  in ipa_interrupt_config()  argument
241 	struct device *dev = &ipa->pdev->dev;  in ipa_interrupt_config()
243 	const struct reg *reg;  in ipa_interrupt_config()  local
247 	ret = platform_get_irq_byname(ipa->pdev, "ipa");  in ipa_interrupt_config()
249 		dev_err(dev, "DT error %d getting \"ipa\" IRQ property\n",  in ipa_interrupt_config()
251 		return ERR_PTR(ret ? : -EINVAL);  in ipa_interrupt_config()
257 		return ERR_PTR(-ENOMEM);  in ipa_interrupt_config()
258 	interrupt->ipa = ipa;  in ipa_interrupt_config()
259 	interrupt->irq = irq;  in ipa_interrupt_config()
261 	/* Start with all IPA interrupts disabled */  in ipa_interrupt_config()
262 	reg = ipa_reg(ipa, IPA_IRQ_EN);  in ipa_interrupt_config()
263 	iowrite32(0, ipa->reg_virt + reg_offset(reg));  in ipa_interrupt_config()
266 				   "ipa", interrupt);  in ipa_interrupt_config()
268 		dev_err(dev, "error %d requesting \"ipa\" IRQ\n", ret);  in ipa_interrupt_config()
274 		dev_err(dev, "error %d registering \"ipa\" IRQ as wakeirq\n", ret);  in ipa_interrupt_config()
281 	free_irq(interrupt->irq, interrupt);  in ipa_interrupt_config()
291 	struct device *dev = &interrupt->ipa->pdev->dev;  in ipa_interrupt_deconfig()
294 	free_irq(interrupt->irq, interrupt);  in ipa_interrupt_deconfig()