drivers/irqchip/irq-imx-gpcv2.c - kernel/msm-5.4 - Gitiles

 /*
  * Copyright (C) 2015 Freescale Semiconductor, Inc.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */

 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/slab.h>
 #include <linux/irqchip.h>
 #include <linux/syscore_ops.h>

 #define IMR_NUM			4
 #define GPC_MAX_IRQS            (IMR_NUM * 32)

 #define GPC_IMR1_CORE0		0x30
 #define GPC_IMR1_CORE1		0x40

 struct gpcv2_irqchip_data {
 	struct raw_spinlock	rlock;
 	void __iomem		*gpc_base;
 	u32			wakeup_sources[IMR_NUM];
 	u32			saved_irq_mask[IMR_NUM];
 	u32			cpu2wakeup;
 };

 static struct gpcv2_irqchip_data *imx_gpcv2_instance;

 /*
  * Interface for the low level wakeup code.
  */
 u32 imx_gpcv2_get_wakeup_source(u32 **sources)
 {
 	if (!imx_gpcv2_instance)
 		return 0;

 	if (sources)
 		*sources = imx_gpcv2_instance->wakeup_sources;

 	return IMR_NUM;
 }

 static int gpcv2_wakeup_source_save(void)
 {
 	struct gpcv2_irqchip_data *cd;
 	void __iomem *reg;
 	int i;

 	cd = imx_gpcv2_instance;
 	if (!cd)
 		return 0;

 	for (i = 0; i < IMR_NUM; i++) {
 		reg = cd->gpc_base + cd->cpu2wakeup + i * 4;
 		cd->saved_irq_mask[i] = readl_relaxed(reg);
 		writel_relaxed(cd->wakeup_sources[i], reg);
 	}

 	return 0;
 }

 static void gpcv2_wakeup_source_restore(void)
 {
 	struct gpcv2_irqchip_data *cd;
 	void __iomem *reg;
 	int i;

 	cd = imx_gpcv2_instance;
 	if (!cd)
 		return;

 	for (i = 0; i < IMR_NUM; i++) {
 		reg = cd->gpc_base + cd->cpu2wakeup + i * 4;
 		writel_relaxed(cd->saved_irq_mask[i], reg);
 	}
 }

 static struct syscore_ops imx_gpcv2_syscore_ops = {
 	.suspend	= gpcv2_wakeup_source_save,
 	.resume		= gpcv2_wakeup_source_restore,
 };

 static int imx_gpcv2_irq_set_wake(struct irq_data *d, unsigned int on)
 {
 	struct gpcv2_irqchip_data *cd = d->chip_data;
 	unsigned int idx = d->hwirq / 32;
 	unsigned long flags;
 	void __iomem *reg;
 	u32 mask, val;

 	raw_spin_lock_irqsave(&cd->rlock, flags);
 	reg = cd->gpc_base + cd->cpu2wakeup + idx * 4;
 	mask = 1 << d->hwirq % 32;
 	val = cd->wakeup_sources[idx];

 	cd->wakeup_sources[idx] = on ? (val & ~mask) : (val | mask);
 	raw_spin_unlock_irqrestore(&cd->rlock, flags);

 	/*
 	 * Do *not* call into the parent, as the GIC doesn't have any
 	 * wake-up facility...
 	 */

 	return 0;
 }

 static void imx_gpcv2_irq_unmask(struct irq_data *d)
 {
 	struct gpcv2_irqchip_data *cd = d->chip_data;
 	void __iomem *reg;
 	u32 val;

 	raw_spin_lock(&cd->rlock);
 	reg = cd->gpc_base + cd->cpu2wakeup + d->hwirq / 32 * 4;
 	val = readl_relaxed(reg);
 	val &= ~(1 << d->hwirq % 32);
 	writel_relaxed(val, reg);
 	raw_spin_unlock(&cd->rlock);

 	irq_chip_unmask_parent(d);
 }

 static void imx_gpcv2_irq_mask(struct irq_data *d)
 {
 	struct gpcv2_irqchip_data *cd = d->chip_data;
 	void __iomem *reg;
 	u32 val;

 	raw_spin_lock(&cd->rlock);
 	reg = cd->gpc_base + cd->cpu2wakeup + d->hwirq / 32 * 4;
 	val = readl_relaxed(reg);
 	val |= 1 << (d->hwirq % 32);
 	writel_relaxed(val, reg);
 	raw_spin_unlock(&cd->rlock);

 	irq_chip_mask_parent(d);
 }

 static struct irq_chip gpcv2_irqchip_data_chip = {
 	.name			= "GPCv2",
 	.irq_eoi		= irq_chip_eoi_parent,
 	.irq_mask		= imx_gpcv2_irq_mask,
 	.irq_unmask		= imx_gpcv2_irq_unmask,
 	.irq_set_wake		= imx_gpcv2_irq_set_wake,
 	.irq_retrigger		= irq_chip_retrigger_hierarchy,
 #ifdef CONFIG_SMP
 	.irq_set_affinity	= irq_chip_set_affinity_parent,
 #endif
 };

 static int imx_gpcv2_domain_translate(struct irq_domain *d,
 				      struct irq_fwspec *fwspec,
 				      unsigned long *hwirq,
 				      unsigned int *type)
 {
 	if (is_of_node(fwspec->fwnode)) {
 		if (fwspec->param_count != 3)
 			return -EINVAL;

 		/* No PPI should point to this domain */
 		if (fwspec->param[0] != 0)
 			return -EINVAL;

 		*hwirq = fwspec->param[1];
 		*type = fwspec->param[2];
 		return 0;
 	}

 	return -EINVAL;
 }

 static int imx_gpcv2_domain_alloc(struct irq_domain *domain,
 				  unsigned int irq, unsigned int nr_irqs,
 				  void *data)
 {
 	struct irq_fwspec *fwspec = data;
 	struct irq_fwspec parent_fwspec;
 	irq_hw_number_t hwirq;
 	unsigned int type;
 	int err;
 	int i;

 	err = imx_gpcv2_domain_translate(domain, fwspec, &hwirq, &type);
 	if (err)
 		return err;

 	if (hwirq >= GPC_MAX_IRQS)
 		return -EINVAL;

 	for (i = 0; i < nr_irqs; i++) {
 		irq_domain_set_hwirq_and_chip(domain, irq + i, hwirq + i,
 				&gpcv2_irqchip_data_chip, domain->host_data);
 	}

 	parent_fwspec = *fwspec;
 	parent_fwspec.fwnode = domain->parent->fwnode;
 	return irq_domain_alloc_irqs_parent(domain, irq, nr_irqs,
 					    &parent_fwspec);
 }

 static const struct irq_domain_ops gpcv2_irqchip_data_domain_ops = {
 	.translate	= imx_gpcv2_domain_translate,
 	.alloc		= imx_gpcv2_domain_alloc,
 	.free		= irq_domain_free_irqs_common,
 };

 static int __init imx_gpcv2_irqchip_init(struct device_node *node,
 			       struct device_node *parent)
 {
 	struct irq_domain *parent_domain, *domain;
 	struct gpcv2_irqchip_data *cd;
 	int i;

 	if (!parent) {
 		pr_err("%s: no parent, giving up\n", node->full_name);
 		return -ENODEV;
 	}

 	parent_domain = irq_find_host(parent);
 	if (!parent_domain) {
 		pr_err("%s: unable to get parent domain\n", node->full_name);
 		return -ENXIO;
 	}

 	cd = kzalloc(sizeof(struct gpcv2_irqchip_data), GFP_KERNEL);
 	if (!cd) {
 		pr_err("kzalloc failed!\n");
 		return -ENOMEM;
 	}

 	raw_spin_lock_init(&cd->rlock);

 	cd->gpc_base = of_iomap(node, 0);
 	if (!cd->gpc_base) {
 		pr_err("fsl-gpcv2: unable to map gpc registers\n");
 		kfree(cd);
 		return -ENOMEM;
 	}

 	domain = irq_domain_add_hierarchy(parent_domain, 0, GPC_MAX_IRQS,
 				node, &gpcv2_irqchip_data_domain_ops, cd);
 	if (!domain) {
 		iounmap(cd->gpc_base);
 		kfree(cd);
 		return -ENOMEM;
 	}
 	irq_set_default_host(domain);

 	/* Initially mask all interrupts */
 	for (i = 0; i < IMR_NUM; i++) {
 		writel_relaxed(~0, cd->gpc_base + GPC_IMR1_CORE0 + i * 4);
 		writel_relaxed(~0, cd->gpc_base + GPC_IMR1_CORE1 + i * 4);
 		cd->wakeup_sources[i] = ~0;
 	}

 	/* Let CORE0 as the default CPU to wake up by GPC */
 	cd->cpu2wakeup = GPC_IMR1_CORE0;

 	/*
 	 * Due to hardware design failure, need to make sure GPR
 	 * interrupt(#32) is unmasked during RUN mode to avoid entering
 	 * DSM by mistake.
 	 */
 	writel_relaxed(~0x1, cd->gpc_base + cd->cpu2wakeup);

 	imx_gpcv2_instance = cd;
 	register_syscore_ops(&imx_gpcv2_syscore_ops);

 	/*
 	 * Clear the OF_POPULATED flag set in of_irq_init so that
 	 * later the GPC power domain driver will not be skipped.
 	 */
 	of_node_clear_flag(node, OF_POPULATED);
 	return 0;
 }

 IRQCHIP_DECLARE(imx_gpcv2, "fsl,imx7d-gpc", imx_gpcv2_irqchip_init);
	/*
	* Copyright (C) 2015 Freescale Semiconductor, Inc.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/

	#include <linux/of_address.h>
	#include <linux/of_irq.h>
	#include <linux/slab.h>
	#include <linux/irqchip.h>
	#include <linux/syscore_ops.h>

	#define IMR_NUM 4
	#define GPC_MAX_IRQS (IMR_NUM * 32)

	#define GPC_IMR1_CORE0 0x30
	#define GPC_IMR1_CORE1 0x40

	struct gpcv2_irqchip_data {
	struct raw_spinlock rlock;
	void __iomem *gpc_base;
	u32 wakeup_sources[IMR_NUM];
	u32 saved_irq_mask[IMR_NUM];
	u32 cpu2wakeup;
	};

	static struct gpcv2_irqchip_data *imx_gpcv2_instance;

	/*
	* Interface for the low level wakeup code.
	*/
	u32 imx_gpcv2_get_wakeup_source(u32 **sources)
	{
	if (!imx_gpcv2_instance)
	return 0;

	if (sources)
	*sources = imx_gpcv2_instance->wakeup_sources;

	return IMR_NUM;
	}

	static int gpcv2_wakeup_source_save(void)
	{
	struct gpcv2_irqchip_data *cd;
	void __iomem *reg;
	int i;

	cd = imx_gpcv2_instance;
	if (!cd)
	return 0;

	for (i = 0; i < IMR_NUM; i++) {
	reg = cd->gpc_base + cd->cpu2wakeup + i * 4;
	cd->saved_irq_mask[i] = readl_relaxed(reg);
	writel_relaxed(cd->wakeup_sources[i], reg);
	}

	return 0;
	}

	static void gpcv2_wakeup_source_restore(void)
	{
	struct gpcv2_irqchip_data *cd;
	void __iomem *reg;
	int i;

	cd = imx_gpcv2_instance;
	if (!cd)
	return;

	for (i = 0; i < IMR_NUM; i++) {
	reg = cd->gpc_base + cd->cpu2wakeup + i * 4;
	writel_relaxed(cd->saved_irq_mask[i], reg);
	}
	}

	static struct syscore_ops imx_gpcv2_syscore_ops = {
	.suspend = gpcv2_wakeup_source_save,
	.resume = gpcv2_wakeup_source_restore,
	};

	static int imx_gpcv2_irq_set_wake(struct irq_data *d, unsigned int on)
	{
	struct gpcv2_irqchip_data *cd = d->chip_data;
	unsigned int idx = d->hwirq / 32;
	unsigned long flags;
	void __iomem *reg;
	u32 mask, val;

	raw_spin_lock_irqsave(&cd->rlock, flags);
	reg = cd->gpc_base + cd->cpu2wakeup + idx * 4;
	mask = 1 << d->hwirq % 32;
	val = cd->wakeup_sources[idx];

	cd->wakeup_sources[idx] = on ? (val & ~mask) : (val \| mask);
	raw_spin_unlock_irqrestore(&cd->rlock, flags);

	/*
	* Do not call into the parent, as the GIC doesn't have any
	* wake-up facility...
	*/

	return 0;
	}

	static void imx_gpcv2_irq_unmask(struct irq_data *d)
	{
	struct gpcv2_irqchip_data *cd = d->chip_data;
	void __iomem *reg;
	u32 val;

	raw_spin_lock(&cd->rlock);
	reg = cd->gpc_base + cd->cpu2wakeup + d->hwirq / 32 * 4;
	val = readl_relaxed(reg);
	val &= ~(1 << d->hwirq % 32);
	writel_relaxed(val, reg);
	raw_spin_unlock(&cd->rlock);

	irq_chip_unmask_parent(d);
	}

	static void imx_gpcv2_irq_mask(struct irq_data *d)
	{
	struct gpcv2_irqchip_data *cd = d->chip_data;
	void __iomem *reg;
	u32 val;

	raw_spin_lock(&cd->rlock);
	reg = cd->gpc_base + cd->cpu2wakeup + d->hwirq / 32 * 4;
	val = readl_relaxed(reg);
	val \|= 1 << (d->hwirq % 32);
	writel_relaxed(val, reg);
	raw_spin_unlock(&cd->rlock);

	irq_chip_mask_parent(d);
	}

	static struct irq_chip gpcv2_irqchip_data_chip = {
	.name = "GPCv2",
	.irq_eoi = irq_chip_eoi_parent,
	.irq_mask = imx_gpcv2_irq_mask,
	.irq_unmask = imx_gpcv2_irq_unmask,
	.irq_set_wake = imx_gpcv2_irq_set_wake,
	.irq_retrigger = irq_chip_retrigger_hierarchy,
	#ifdef CONFIG_SMP
	.irq_set_affinity = irq_chip_set_affinity_parent,
	#endif
	};

	static int imx_gpcv2_domain_translate(struct irq_domain *d,
	struct irq_fwspec *fwspec,
	unsigned long *hwirq,
	unsigned int *type)
	{
	if (is_of_node(fwspec->fwnode)) {
	if (fwspec->param_count != 3)
	return -EINVAL;

	/* No PPI should point to this domain */
	if (fwspec->param[0] != 0)
	return -EINVAL;

	*hwirq = fwspec->param[1];
	*type = fwspec->param[2];
	return 0;
	}

	return -EINVAL;
	}

	static int imx_gpcv2_domain_alloc(struct irq_domain *domain,
	unsigned int irq, unsigned int nr_irqs,
	void *data)
	{
	struct irq_fwspec *fwspec = data;
	struct irq_fwspec parent_fwspec;
	irq_hw_number_t hwirq;
	unsigned int type;
	int err;
	int i;

	err = imx_gpcv2_domain_translate(domain, fwspec, &hwirq, &type);
	if (err)
	return err;

	if (hwirq >= GPC_MAX_IRQS)
	return -EINVAL;

	for (i = 0; i < nr_irqs; i++) {
	irq_domain_set_hwirq_and_chip(domain, irq + i, hwirq + i,
	&gpcv2_irqchip_data_chip, domain->host_data);
	}

	parent_fwspec = *fwspec;
	parent_fwspec.fwnode = domain->parent->fwnode;
	return irq_domain_alloc_irqs_parent(domain, irq, nr_irqs,
	&parent_fwspec);
	}

	static const struct irq_domain_ops gpcv2_irqchip_data_domain_ops = {
	.translate = imx_gpcv2_domain_translate,
	.alloc = imx_gpcv2_domain_alloc,
	.free = irq_domain_free_irqs_common,
	};

	static int __init imx_gpcv2_irqchip_init(struct device_node *node,
	struct device_node *parent)
	{
	struct irq_domain parent_domain, domain;
	struct gpcv2_irqchip_data *cd;
	int i;

	if (!parent) {
	pr_err("%s: no parent, giving up\n", node->full_name);
	return -ENODEV;
	}

	parent_domain = irq_find_host(parent);
	if (!parent_domain) {
	pr_err("%s: unable to get parent domain\n", node->full_name);
	return -ENXIO;
	}

	cd = kzalloc(sizeof(struct gpcv2_irqchip_data), GFP_KERNEL);
	if (!cd) {
	pr_err("kzalloc failed!\n");
	return -ENOMEM;
	}

	raw_spin_lock_init(&cd->rlock);

	cd->gpc_base = of_iomap(node, 0);
	if (!cd->gpc_base) {
	pr_err("fsl-gpcv2: unable to map gpc registers\n");
	kfree(cd);
	return -ENOMEM;
	}

	domain = irq_domain_add_hierarchy(parent_domain, 0, GPC_MAX_IRQS,
	node, &gpcv2_irqchip_data_domain_ops, cd);
	if (!domain) {
	iounmap(cd->gpc_base);
	kfree(cd);
	return -ENOMEM;
	}
	irq_set_default_host(domain);

	/* Initially mask all interrupts */
	for (i = 0; i < IMR_NUM; i++) {
	writel_relaxed(~0, cd->gpc_base + GPC_IMR1_CORE0 + i * 4);
	writel_relaxed(~0, cd->gpc_base + GPC_IMR1_CORE1 + i * 4);
	cd->wakeup_sources[i] = ~0;
	}

	/* Let CORE0 as the default CPU to wake up by GPC */
	cd->cpu2wakeup = GPC_IMR1_CORE0;

	/*
	* Due to hardware design failure, need to make sure GPR
	* interrupt(#32) is unmasked during RUN mode to avoid entering
	* DSM by mistake.
	*/
	writel_relaxed(~0x1, cd->gpc_base + cd->cpu2wakeup);

	imx_gpcv2_instance = cd;
	register_syscore_ops(&imx_gpcv2_syscore_ops);

	/*
	* Clear the OF_POPULATED flag set in of_irq_init so that
	* later the GPC power domain driver will not be skipped.
	*/
	of_node_clear_flag(node, OF_POPULATED);
	return 0;
	}

	IRQCHIP_DECLARE(imx_gpcv2, "fsl,imx7d-gpc", imx_gpcv2_irqchip_init);