1 // SPDX-License-Identifier: GPL-2.0-only
3  * PRU-ICSS INTC IRQChip driver for various TI SoCs
5  * Copyright (C) 2016-2020 Texas Instruments Incorporated - http://www.ti.com/
9  *	Suman Anna <s-anna@ti.com>
24  * Number of host interrupts reaching the main MPU sub-system. Note that this
25  * is not the same as the total number of host interrupts supported by the PRUSS
26  * INTC instance
57 /* CMR register bit-field macros */
62 /* HMR register bit-field macros */
67 /* HIPIR register bit-fields */
74  * struct pruss_intc_map_record - keeps track of actual mapping state
84  * struct pruss_intc_match_data - match data to handle SoC variations
85  * @num_system_events: number of input system events handled by the PRUSS INTC
87  *		     channels) supported by the PRUSS INTC
95  * struct pruss_intc - PRUSS interrupt controller structure
98  * @irqs: kernel irq numbers corresponding to PRUSS host interrupts
99  * @base: base virtual address of INTC register space
101  * @soc_config: cached PRUSS INTC IP configuration data
102  * @dev: PRUSS INTC device pointer
113 	struct mutex lock; /* PRUSS INTC lock */
117  * struct pruss_host_irq_data - PRUSS host irq data structure
118  * @intc: PRUSS interrupt controller pointer
122 	struct pruss_intc *intc;  member
126 static inline u32 pruss_intc_read_reg(struct pruss_intc *intc, unsigned int reg)  in pruss_intc_read_reg()  argument
128 	return readl_relaxed(intc->base + reg);  in pruss_intc_read_reg()
131 static inline void pruss_intc_write_reg(struct pruss_intc *intc,  in pruss_intc_write_reg()  argument
134 	writel_relaxed(val, intc->base + reg);  in pruss_intc_write_reg()
137 static void pruss_intc_update_cmr(struct pruss_intc *intc, unsigned int evt,  in pruss_intc_update_cmr()  argument
145 	val = pruss_intc_read_reg(intc, PRU_INTC_CMR(idx));  in pruss_intc_update_cmr()
148 	pruss_intc_write_reg(intc, PRU_INTC_CMR(idx), val);  in pruss_intc_update_cmr()
150 	dev_dbg(intc->dev, "SYSEV%u -> CH%d (CMR%d 0x%08x)\n", evt, ch,  in pruss_intc_update_cmr()
151 		idx, pruss_intc_read_reg(intc, PRU_INTC_CMR(idx)));  in pruss_intc_update_cmr()
154 static void pruss_intc_update_hmr(struct pruss_intc *intc, u8 ch, u8 host)  in pruss_intc_update_hmr()  argument
161 	val = pruss_intc_read_reg(intc, PRU_INTC_HMR(idx));  in pruss_intc_update_hmr()
164 	pruss_intc_write_reg(intc, PRU_INTC_HMR(idx), val);  in pruss_intc_update_hmr()
166 	dev_dbg(intc->dev, "CH%d -> HOST%d (HMR%d 0x%08x)\n", ch, host, idx,  in pruss_intc_update_hmr()
167 		pruss_intc_read_reg(intc, PRU_INTC_HMR(idx)));  in pruss_intc_update_hmr()
171  * pruss_intc_map() - configure the PRUSS INTC
172  * @intc: PRUSS interrupt controller pointer
175  * Configures the PRUSS INTC with the provided configuration from the one parsed
178 static void pruss_intc_map(struct pruss_intc *intc, unsigned long hwirq)  in pruss_intc_map()  argument
180 	struct device *dev = intc->dev;  in pruss_intc_map()
184 	mutex_lock(&intc->lock);  in pruss_intc_map()
186 	intc->event_channel[hwirq].ref_count++;  in pruss_intc_map()
188 	ch = intc->event_channel[hwirq].value;  in pruss_intc_map()
189 	host = intc->channel_host[ch].value;  in pruss_intc_map()
191 	pruss_intc_update_cmr(intc, hwirq, ch);  in pruss_intc_map()
197 	pruss_intc_write_reg(intc, PRU_INTC_ESR(reg_idx), val);  in pruss_intc_map()
198 	pruss_intc_write_reg(intc, PRU_INTC_SECR(reg_idx), val);  in pruss_intc_map()
200 	if (++intc->channel_host[ch].ref_count == 1) {  in pruss_intc_map()
201 		pruss_intc_update_hmr(intc, ch, host);  in pruss_intc_map()
204 		pruss_intc_write_reg(intc, PRU_INTC_HIEISR, host);  in pruss_intc_map()
210 	mutex_unlock(&intc->lock);  in pruss_intc_map()
214  * pruss_intc_unmap() - unconfigure the PRUSS INTC
215  * @intc: PRUSS interrupt controller pointer
222 static void pruss_intc_unmap(struct pruss_intc *intc, unsigned long hwirq)  in pruss_intc_unmap()  argument
227 	mutex_lock(&intc->lock);  in pruss_intc_unmap()
229 	ch = intc->event_channel[hwirq].value;  in pruss_intc_unmap()
230 	host = intc->channel_host[ch].value;  in pruss_intc_unmap()
232 	if (--intc->channel_host[ch].ref_count == 0) {  in pruss_intc_unmap()
234 		pruss_intc_write_reg(intc, PRU_INTC_HIDISR, host);  in pruss_intc_unmap()
237 		pruss_intc_update_hmr(intc, ch, 0);  in pruss_intc_unmap()
240 	intc->event_channel[hwirq].ref_count--;  in pruss_intc_unmap()
245 	pruss_intc_write_reg(intc, PRU_INTC_ECR(reg_idx), val);  in pruss_intc_unmap()
247 	pruss_intc_write_reg(intc, PRU_INTC_SECR(reg_idx), val);  in pruss_intc_unmap()
250 	pruss_intc_update_cmr(intc, hwirq, 0);  in pruss_intc_unmap()
252 	dev_dbg(intc->dev, "unmapped system_event = %lu channel = %d host = %d\n",  in pruss_intc_unmap()
255 	mutex_unlock(&intc->lock);  in pruss_intc_unmap()
258 static void pruss_intc_init(struct pruss_intc *intc)  in pruss_intc_init()  argument
260 	const struct pruss_intc_match_data *soc_config = intc->soc_config;  in pruss_intc_init()
263 	num_chnl_map_regs = DIV_ROUND_UP(soc_config->num_system_events,  in pruss_intc_init()
265 	num_host_intr_regs = DIV_ROUND_UP(soc_config->num_host_events,  in pruss_intc_init()
267 	num_event_type_regs = DIV_ROUND_UP(soc_config->num_system_events, 32);  in pruss_intc_init()
274 		pruss_intc_write_reg(intc, PRU_INTC_SIPR(i), 0xffffffff);  in pruss_intc_init()
275 		pruss_intc_write_reg(intc, PRU_INTC_SITR(i), 0);  in pruss_intc_init()
280 		pruss_intc_write_reg(intc, PRU_INTC_CMR(i), 0);  in pruss_intc_init()
284 		pruss_intc_write_reg(intc, PRU_INTC_HMR(i), 0);  in pruss_intc_init()
287 	pruss_intc_write_reg(intc, PRU_INTC_GER, 1);  in pruss_intc_init()
292 	struct pruss_intc *intc = irq_data_get_irq_chip_data(data);  in pruss_intc_irq_ack()  local
293 	unsigned int hwirq = data->hwirq;  in pruss_intc_irq_ack()
295 	pruss_intc_write_reg(intc, PRU_INTC_SICR, hwirq);  in pruss_intc_irq_ack()
300 	struct pruss_intc *intc = irq_data_get_irq_chip_data(data);  in pruss_intc_irq_mask()  local
301 	unsigned int hwirq = data->hwirq;  in pruss_intc_irq_mask()
303 	pruss_intc_write_reg(intc, PRU_INTC_EICR, hwirq);  in pruss_intc_irq_mask()
308 	struct pruss_intc *intc = irq_data_get_irq_chip_data(data);  in pruss_intc_irq_unmask()  local
309 	unsigned int hwirq = data->hwirq;  in pruss_intc_irq_unmask()
311 	pruss_intc_write_reg(intc, PRU_INTC_EISR, hwirq);  in pruss_intc_irq_unmask()
317 		return -ENODEV;  in pruss_intc_irq_reqres()
331 	struct pruss_intc *intc = irq_data_get_irq_chip_data(data);  in pruss_intc_irq_get_irqchip_state()  local
335 		return -EINVAL;  in pruss_intc_irq_get_irqchip_state()
337 	reg = PRU_INTC_SRSR(data->hwirq / 32);  in pruss_intc_irq_get_irqchip_state()
338 	mask = BIT(data->hwirq % 32);  in pruss_intc_irq_get_irqchip_state()
340 	srsr = pruss_intc_read_reg(intc, reg);  in pruss_intc_irq_get_irqchip_state()
351 	struct pruss_intc *intc = irq_data_get_irq_chip_data(data);  in pruss_intc_irq_set_irqchip_state()  local
354 		return -EINVAL;  in pruss_intc_irq_set_irqchip_state()
357 		pruss_intc_write_reg(intc, PRU_INTC_SISR, data->hwirq);  in pruss_intc_irq_set_irqchip_state()
359 		pruss_intc_write_reg(intc, PRU_INTC_SICR, data->hwirq);  in pruss_intc_irq_set_irqchip_state()
365 	.name			= "pruss-intc",
375 static int pruss_intc_validate_mapping(struct pruss_intc *intc, int event,  in pruss_intc_validate_mapping()  argument
378 	struct device *dev = intc->dev;  in pruss_intc_validate_mapping()
381 	mutex_lock(&intc->lock);  in pruss_intc_validate_mapping()
384 	if (intc->event_channel[event].ref_count > 0 &&  in pruss_intc_validate_mapping()
385 	    intc->event_channel[event].value != channel) {  in pruss_intc_validate_mapping()
387 			event, channel, intc->event_channel[event].value);  in pruss_intc_validate_mapping()
388 		ret = -EBUSY;  in pruss_intc_validate_mapping()
393 	if (intc->channel_host[channel].ref_count > 0 &&  in pruss_intc_validate_mapping()
394 	    intc->channel_host[channel].value != host) {  in pruss_intc_validate_mapping()
396 			channel, host, intc->channel_host[channel].value);  in pruss_intc_validate_mapping()
397 		ret = -EBUSY;  in pruss_intc_validate_mapping()
401 	intc->event_channel[event].value = channel;  in pruss_intc_validate_mapping()
402 	intc->channel_host[channel].value = host;  in pruss_intc_validate_mapping()
405 	mutex_unlock(&intc->lock);  in pruss_intc_validate_mapping()
414 	struct pruss_intc *intc = d->host_data;  in pruss_intc_irq_domain_xlate()  local
415 	struct device *dev = intc->dev;  in pruss_intc_irq_domain_xlate()
419 		return -EINVAL;  in pruss_intc_irq_domain_xlate()
422 	if (sys_event < 0 || sys_event >= intc->soc_config->num_system_events) {  in pruss_intc_irq_domain_xlate()
424 		return -EINVAL;  in pruss_intc_irq_domain_xlate()
428 	if (channel < 0 || channel >= intc->soc_config->num_host_events) {  in pruss_intc_irq_domain_xlate()
430 		return -EINVAL;  in pruss_intc_irq_domain_xlate()
434 	if (host < 0 || host >= intc->soc_config->num_host_events) {  in pruss_intc_irq_domain_xlate()
436 		return -EINVAL;  in pruss_intc_irq_domain_xlate()
440 	ret = pruss_intc_validate_mapping(intc, sys_event, channel, host);  in pruss_intc_irq_domain_xlate()
453 	struct pruss_intc *intc = d->host_data;  in pruss_intc_irq_domain_map()  local
455 	pruss_intc_map(intc, hw);  in pruss_intc_irq_domain_map()
457 	irq_set_chip_data(virq, intc);  in pruss_intc_irq_domain_map()
465 	struct pruss_intc *intc = d->host_data;  in pruss_intc_irq_domain_unmap()  local
470 	pruss_intc_unmap(intc, hwirq);  in pruss_intc_irq_domain_unmap()
484 	struct pruss_intc *intc = host_irq_data->intc;  in pruss_intc_irq_handler()  local
485 	u8 host_irq = host_irq_data->host_irq + FIRST_PRU_HOST_INT;  in pruss_intc_irq_handler()
494 		/* get highest priority pending PRUSS system event */  in pruss_intc_irq_handler()
495 		hipir = pruss_intc_read_reg(intc, PRU_INTC_HIPIR(host_irq));  in pruss_intc_irq_handler()
500 		virq = irq_find_mapping(intc->domain, hwirq);  in pruss_intc_irq_handler()
507 			pruss_intc_write_reg(intc, PRU_INTC_SICR, hwirq);  in pruss_intc_irq_handler()
523 	struct device *dev = &pdev->dev;  in pruss_intc_probe()
524 	struct pruss_intc *intc;  in pruss_intc_probe()  local
531 		return -ENODEV;  in pruss_intc_probe()
533 	max_system_events = data->num_system_events;  in pruss_intc_probe()
535 	intc = devm_kzalloc(dev, sizeof(*intc), GFP_KERNEL);  in pruss_intc_probe()
536 	if (!intc)  in pruss_intc_probe()
537 		return -ENOMEM;  in pruss_intc_probe()
539 	intc->soc_config = data;  in pruss_intc_probe()
540 	intc->dev = dev;  in pruss_intc_probe()
541 	platform_set_drvdata(pdev, intc);  in pruss_intc_probe()
543 	intc->base = devm_platform_ioremap_resource(pdev, 0);  in pruss_intc_probe()
544 	if (IS_ERR(intc->base))  in pruss_intc_probe()
545 		return PTR_ERR(intc->base);  in pruss_intc_probe()
547 	ret = of_property_read_u8(dev->of_node, "ti,irqs-reserved",  in pruss_intc_probe()
551 	 * The irqs-reserved is used only for some SoC's therefore not having  in pruss_intc_probe()
554 	if (ret < 0 && ret != -EINVAL)  in pruss_intc_probe()
557 	pruss_intc_init(intc);  in pruss_intc_probe()
559 	mutex_init(&intc->lock);  in pruss_intc_probe()
561 	intc->domain = irq_domain_add_linear(dev->of_node, max_system_events,  in pruss_intc_probe()
562 					     &pruss_intc_irq_domain_ops, intc);  in pruss_intc_probe()
563 	if (!intc->domain)  in pruss_intc_probe()
564 		return -ENOMEM;  in pruss_intc_probe()
572 			ret = (irq == 0) ? -EINVAL : irq;  in pruss_intc_probe()
576 		intc->irqs[i] = irq;  in pruss_intc_probe()
580 			ret = -ENOMEM;  in pruss_intc_probe()
584 		host_data->intc = intc;  in pruss_intc_probe()
585 		host_data->host_irq = i;  in pruss_intc_probe()
594 	while (--i >= 0) {  in pruss_intc_probe()
595 		if (intc->irqs[i])  in pruss_intc_probe()
596 			irq_set_chained_handler_and_data(intc->irqs[i], NULL,  in pruss_intc_probe()
600 	irq_domain_remove(intc->domain);  in pruss_intc_probe()
607 	struct pruss_intc *intc = platform_get_drvdata(pdev);  in pruss_intc_remove()  local
608 	u8 max_system_events = intc->soc_config->num_system_events;  in pruss_intc_remove()
613 		if (intc->irqs[i])  in pruss_intc_remove()
614 			irq_set_chained_handler_and_data(intc->irqs[i], NULL,  in pruss_intc_remove()
619 		irq_dispose_mapping(irq_find_mapping(intc->domain, hwirq));  in pruss_intc_remove()
621 	irq_domain_remove(intc->domain);  in pruss_intc_remove()
638 		.compatible = "ti,pruss-intc",
642 		.compatible = "ti,icssg-intc",
651 		.name = "pruss-intc",
661 MODULE_AUTHOR("Suman Anna <s-anna@ti.com>");
663 MODULE_DESCRIPTION("TI PRU-ICSS INTC Driver");