1 // SPDX-License-Identifier: GPL-2.0
3 /* Copyright (c) 2014-2018, The Linux Foundation. All rights reserved.
4  * Copyright (C) 2018-2024 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
28 #include "ipa.h"
36  * struct ipa_interrupt - IPA interrupt information
37  * @ipa:		IPA pointer
38  * @irq:		Linux IRQ number used for IPA interrupts
43 	struct ipa *ipa;  member
52 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_suspend_clear_all()  local
56 	unit_count = DIV_ROUND_UP(ipa->endpoint_count, 32);  in ipa_interrupt_suspend_clear_all()
58 		const struct reg *reg;  in ipa_interrupt_suspend_clear_all()  local
61 		reg = ipa_reg(ipa, IRQ_SUSPEND_INFO);  in ipa_interrupt_suspend_clear_all()
62 		val = ioread32(ipa->reg_virt + reg_n_offset(reg, unit));  in ipa_interrupt_suspend_clear_all()
64 		/* SUSPEND interrupt status isn't cleared on IPA version 3.0 */  in ipa_interrupt_suspend_clear_all()
65 		if (!val || ipa->version == IPA_VERSION_3_0)  in ipa_interrupt_suspend_clear_all()
68 		reg = ipa_reg(ipa, IRQ_SUSPEND_CLR);  in ipa_interrupt_suspend_clear_all()
69 		iowrite32(val, ipa->reg_virt + reg_n_offset(reg, unit));  in ipa_interrupt_suspend_clear_all()
76 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_process()  local
77 	const struct reg *reg;  in ipa_interrupt_process()  local
81 	reg = ipa_reg(ipa, IPA_IRQ_CLR);  in ipa_interrupt_process()
82 	offset = reg_offset(reg);  in ipa_interrupt_process()
90 		iowrite32(mask, ipa->reg_virt + offset);  in ipa_interrupt_process()
91 		ipa_uc_interrupt_handler(ipa, irq_id);  in ipa_interrupt_process()
104 		iowrite32(mask, ipa->reg_virt + offset);  in ipa_interrupt_process()
109 /* IPA IRQ handler is threaded */
113 	struct ipa *ipa = interrupt->ipa;  in ipa_isr_thread()  local
114 	u32 enabled = interrupt->enabled;  in ipa_isr_thread()
115 	struct device *dev = ipa->dev;  in ipa_isr_thread()
116 	const struct reg *reg;  in ipa_isr_thread()  local
130 	reg = ipa_reg(ipa, IPA_IRQ_STTS);  in ipa_isr_thread()
131 	offset = reg_offset(reg);  in ipa_isr_thread()
132 	pending = ioread32(ipa->reg_virt + offset);  in ipa_isr_thread()
141 		pending = ioread32(ipa->reg_virt + offset);  in ipa_isr_thread()
146 		dev_dbg(dev, "clearing disabled IPA interrupts 0x%08x\n",  in ipa_isr_thread()
148 		reg = ipa_reg(ipa, IPA_IRQ_CLR);  in ipa_isr_thread()
149 		iowrite32(pending, ipa->reg_virt + reg_offset(reg));  in ipa_isr_thread()
158 static void ipa_interrupt_enabled_update(struct ipa *ipa)  in ipa_interrupt_enabled_update()  argument
160 	const struct reg *reg = ipa_reg(ipa, IPA_IRQ_EN);  in ipa_interrupt_enabled_update()  local
162 	iowrite32(ipa->interrupt->enabled, ipa->reg_virt + reg_offset(reg));  in ipa_interrupt_enabled_update()
165 /* Enable an IPA interrupt type */
166 void ipa_interrupt_enable(struct ipa *ipa, enum ipa_irq_id ipa_irq)  in ipa_interrupt_enable()  argument
168 	/* Update the IPA interrupt mask to enable it */  in ipa_interrupt_enable()
169 	ipa->interrupt->enabled |= BIT(ipa_irq);  in ipa_interrupt_enable()
170 	ipa_interrupt_enabled_update(ipa);  in ipa_interrupt_enable()
173 /* Disable an IPA interrupt type */
174 void ipa_interrupt_disable(struct ipa *ipa, enum ipa_irq_id ipa_irq)  in ipa_interrupt_disable()  argument
176 	/* Update the IPA interrupt mask to disable it */  in ipa_interrupt_disable()
177 	ipa->interrupt->enabled &= ~BIT(ipa_irq);  in ipa_interrupt_disable()
178 	ipa_interrupt_enabled_update(ipa);  in ipa_interrupt_disable()
181 void ipa_interrupt_irq_disable(struct ipa *ipa)  in ipa_interrupt_irq_disable()  argument
183 	disable_irq(ipa->interrupt->irq);  in ipa_interrupt_irq_disable()
186 void ipa_interrupt_irq_enable(struct ipa *ipa)  in ipa_interrupt_irq_enable()  argument
188 	enable_irq(ipa->interrupt->irq);  in ipa_interrupt_irq_enable()
195 	struct ipa *ipa = interrupt->ipa;  in ipa_interrupt_suspend_control()  local
198 	const struct reg *reg;  in ipa_interrupt_suspend_control()  local
203 	WARN_ON(!test_bit(endpoint_id, ipa->available));  in ipa_interrupt_suspend_control()
205 	/* IPA version 3.0 does not support TX_SUSPEND interrupt control */  in ipa_interrupt_suspend_control()
206 	if (ipa->version == IPA_VERSION_3_0)  in ipa_interrupt_suspend_control()
209 	weight = bitmap_weight(interrupt->suspend_enabled, ipa->endpoint_count);  in ipa_interrupt_suspend_control()
211 		ipa_interrupt_disable(ipa, IPA_IRQ_TX_SUSPEND);  in ipa_interrupt_suspend_control()
213 	reg = ipa_reg(ipa, IRQ_SUSPEND_EN);  in ipa_interrupt_suspend_control()
214 	offset = reg_n_offset(reg, unit);  in ipa_interrupt_suspend_control()
215 	val = ioread32(ipa->reg_virt + offset);  in ipa_interrupt_suspend_control()
221 	__change_bit(endpoint_id, interrupt->suspend_enabled);  in ipa_interrupt_suspend_control()
223 	iowrite32(val, ipa->reg_virt + offset);  in ipa_interrupt_suspend_control()
226 		ipa_interrupt_enable(ipa, IPA_IRQ_TX_SUSPEND);  in ipa_interrupt_suspend_control()
243 /* Simulate arrival of an IPA TX_SUSPEND interrupt */
249 /* Configure the IPA interrupt framework */
250 int ipa_interrupt_config(struct ipa *ipa)  in ipa_interrupt_config()  argument
252 	struct ipa_interrupt *interrupt = ipa->interrupt;  in ipa_interrupt_config()
253 	unsigned int irq = interrupt->irq;  in ipa_interrupt_config()
254 	struct device *dev = ipa->dev;  in ipa_interrupt_config()
255 	const struct reg *reg;  in ipa_interrupt_config()  local
258 	interrupt->ipa = ipa;  in ipa_interrupt_config()
260 	/* Initially all IPA interrupt types are disabled */  in ipa_interrupt_config()
261 	interrupt->enabled = 0;  in ipa_interrupt_config()
262 	interrupt->suspend_enabled = bitmap_zalloc(ipa->endpoint_count,  in ipa_interrupt_config()
264 	if (!interrupt->suspend_enabled) {  in ipa_interrupt_config()
265 		ret = -ENOMEM;  in ipa_interrupt_config()
269 	/* Disable IPA interrupt types */  in ipa_interrupt_config()
270 	reg = ipa_reg(ipa, IPA_IRQ_EN);  in ipa_interrupt_config()
271 	iowrite32(0, ipa->reg_virt + reg_offset(reg));  in ipa_interrupt_config()
274 				   "ipa", interrupt);  in ipa_interrupt_config()
276 		dev_err(dev, "error %d requesting \"ipa\" IRQ\n", ret);  in ipa_interrupt_config()
288 		dev_err(dev, "error %d registering \"ipa\" IRQ as wakeirq\n",  in ipa_interrupt_config()
293 	ipa->interrupt = interrupt;  in ipa_interrupt_config()
300 	free_irq(interrupt->irq, interrupt);  in ipa_interrupt_config()
302 	bitmap_free(interrupt->suspend_enabled);  in ipa_interrupt_config()
310 void ipa_interrupt_deconfig(struct ipa *ipa)  in ipa_interrupt_deconfig()  argument
312 	struct ipa_interrupt *interrupt = ipa->interrupt;  in ipa_interrupt_deconfig()
313 	struct device *dev = ipa->dev;  in ipa_interrupt_deconfig()
315 	ipa->interrupt = NULL;  in ipa_interrupt_deconfig()
319 	free_irq(interrupt->irq, interrupt);  in ipa_interrupt_deconfig()
320 	bitmap_free(interrupt->suspend_enabled);  in ipa_interrupt_deconfig()
323 /* Initialize the IPA interrupt structure */
329 	irq = platform_get_irq_byname(pdev, "ipa");  in ipa_interrupt_init()
331 		return ERR_PTR(irq ? : -EINVAL);  in ipa_interrupt_init()
335 		return ERR_PTR(-ENOMEM);  in ipa_interrupt_init()
336 	interrupt->irq = irq;  in ipa_interrupt_init()