[mirror_ubuntu-hirsute-kernel.git] / drivers / irqchip / irq-bcm7038-l1.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Broadcom BCM7038 style Level 1 interrupt controller driver
 *
 * Copyright (C) 2014 Broadcom Corporation
 * Author: Kevin Cernekee
 */

#define pr_fmt(fmt)	KBUILD_MODNAME	": " fmt

#include <linux/bitops.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/smp.h>
#include <linux/types.h>
#include <linux/irqchip.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/syscore_ops.h>
#ifdef CONFIG_ARM
#include <asm/smp_plat.h>
#endif

#define IRQS_PER_WORD		32
#define REG_BYTES_PER_IRQ_WORD	(sizeof(u32) * 4)
#define MAX_WORDS		8

struct bcm7038_l1_cpu;

struct bcm7038_l1_chip {
	raw_spinlock_t		lock;
	unsigned int		n_words;
	struct irq_domain	*domain;
	struct bcm7038_l1_cpu	*cpus[NR_CPUS];
#ifdef CONFIG_PM_SLEEP
	struct list_head	list;
	u32			wake_mask[MAX_WORDS];
#endif
	u32			irq_fwd_mask[MAX_WORDS];
	u8			affinity[MAX_WORDS * IRQS_PER_WORD];
};

struct bcm7038_l1_cpu {
	void __iomem		*map_base;
	u32			mask_cache[];
};

/*
 * STATUS/MASK_STATUS/MASK_SET/MASK_CLEAR are packed one right after another:
 *
 * 7038:
 *   0x1000_1400: W0_STATUS
 *   0x1000_1404: W1_STATUS
 *   0x1000_1408: W0_MASK_STATUS
 *   0x1000_140c: W1_MASK_STATUS
 *   0x1000_1410: W0_MASK_SET
 *   0x1000_1414: W1_MASK_SET
 *   0x1000_1418: W0_MASK_CLEAR
 *   0x1000_141c: W1_MASK_CLEAR
 *
 * 7445:
 *   0xf03e_1500: W0_STATUS
 *   0xf03e_1504: W1_STATUS
 *   0xf03e_1508: W2_STATUS
 *   0xf03e_150c: W3_STATUS
 *   0xf03e_1510: W4_STATUS
 *   0xf03e_1514: W0_MASK_STATUS
 *   0xf03e_1518: W1_MASK_STATUS
 *   [...]
 */

static inline unsigned int reg_status(struct bcm7038_l1_chip *intc,
				      unsigned int word)
{
	return (0 * intc->n_words + word) * sizeof(u32);
}

static inline unsigned int reg_mask_status(struct bcm7038_l1_chip *intc,
					   unsigned int word)
{
	return (1 * intc->n_words + word) * sizeof(u32);
}

static inline unsigned int reg_mask_set(struct bcm7038_l1_chip *intc,
					unsigned int word)
{
	return (2 * intc->n_words + word) * sizeof(u32);
}

static inline unsigned int reg_mask_clr(struct bcm7038_l1_chip *intc,
					unsigned int word)
{
	return (3 * intc->n_words + word) * sizeof(u32);
}

static inline u32 l1_readl(void __iomem *reg)
{
	if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
		return ioread32be(reg);
	else
		return readl(reg);
}

static inline void l1_writel(u32 val, void __iomem *reg)
{
	if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
		iowrite32be(val, reg);
	else
		writel(val, reg);
}

static void bcm7038_l1_irq_handle(struct irq_desc *desc)
{
	struct bcm7038_l1_chip *intc = irq_desc_get_handler_data(desc);
	struct bcm7038_l1_cpu *cpu;
	struct irq_chip *chip = irq_desc_get_chip(desc);
	unsigned int idx;

#ifdef CONFIG_SMP
	cpu = intc->cpus[cpu_logical_map(smp_processor_id())];
#else
	cpu = intc->cpus[0];
#endif

	chained_irq_enter(chip, desc);

	for (idx = 0; idx < intc->n_words; idx++) {
		int base = idx * IRQS_PER_WORD;
		unsigned long pending, flags;
		int hwirq;

		raw_spin_lock_irqsave(&intc->lock, flags);
		pending = l1_readl(cpu->map_base + reg_status(intc, idx)) &
			  ~cpu->mask_cache[idx];
		raw_spin_unlock_irqrestore(&intc->lock, flags);

		for_each_set_bit(hwirq, &pending, IRQS_PER_WORD) {
			generic_handle_irq(irq_find_mapping(intc->domain,
							    base + hwirq));
		}
	}

	chained_irq_exit(chip, desc);
}

static void __bcm7038_l1_unmask(struct irq_data *d, unsigned int cpu_idx)
{
	struct bcm7038_l1_chip *intc = irq_data_get_irq_chip_data(d);
	u32 word = d->hwirq / IRQS_PER_WORD;
	u32 mask = BIT(d->hwirq % IRQS_PER_WORD);

	intc->cpus[cpu_idx]->mask_cache[word] &= ~mask;
	l1_writel(mask, intc->cpus[cpu_idx]->map_base +
			reg_mask_clr(intc, word));
}

static void __bcm7038_l1_mask(struct irq_data *d, unsigned int cpu_idx)
{
	struct bcm7038_l1_chip *intc = irq_data_get_irq_chip_data(d);
	u32 word = d->hwirq / IRQS_PER_WORD;
	u32 mask = BIT(d->hwirq % IRQS_PER_WORD);

	intc->cpus[cpu_idx]->mask_cache[word] |= mask;
	l1_writel(mask, intc->cpus[cpu_idx]->map_base +
			reg_mask_set(intc, word));
}

static void bcm7038_l1_unmask(struct irq_data *d)
{
	struct bcm7038_l1_chip *intc = irq_data_get_irq_chip_data(d);
	unsigned long flags;

	raw_spin_lock_irqsave(&intc->lock, flags);
	__bcm7038_l1_unmask(d, intc->affinity[d->hwirq]);
	raw_spin_unlock_irqrestore(&intc->lock, flags);
}

static void bcm7038_l1_mask(struct irq_data *d)
{
	struct bcm7038_l1_chip *intc = irq_data_get_irq_chip_data(d);
	unsigned long flags;

	raw_spin_lock_irqsave(&intc->lock, flags);
	__bcm7038_l1_mask(d, intc->affinity[d->hwirq]);
	raw_spin_unlock_irqrestore(&intc->lock, flags);
}

static int bcm7038_l1_set_affinity(struct irq_data *d,
				   const struct cpumask *dest,
				   bool force)
{
	struct bcm7038_l1_chip *intc = irq_data_get_irq_chip_data(d);
	unsigned long flags;
	irq_hw_number_t hw = d->hwirq;
	u32 word = hw / IRQS_PER_WORD;
	u32 mask = BIT(hw % IRQS_PER_WORD);
	unsigned int first_cpu = cpumask_any_and(dest, cpu_online_mask);
	bool was_disabled;

	raw_spin_lock_irqsave(&intc->lock, flags);

	was_disabled = !!(intc->cpus[intc->affinity[hw]]->mask_cache[word] &
			  mask);
	__bcm7038_l1_mask(d, intc->affinity[hw]);
	intc->affinity[hw] = first_cpu;
	if (!was_disabled)
		__bcm7038_l1_unmask(d, first_cpu);

	raw_spin_unlock_irqrestore(&intc->lock, flags);
	irq_data_update_effective_affinity(d, cpumask_of(first_cpu));

	return 0;
}

#ifdef CONFIG_SMP
static void bcm7038_l1_cpu_offline(struct irq_data *d)
{
	struct cpumask *mask = irq_data_get_affinity_mask(d);
	int cpu = smp_processor_id();
	cpumask_t new_affinity;

	/* This CPU was not on the affinity mask */
	if (!cpumask_test_cpu(cpu, mask))
		return;

	if (cpumask_weight(mask) > 1) {
		/*
		 * Multiple CPU affinity, remove this CPU from the affinity
		 * mask
		 */
		cpumask_copy(&new_affinity, mask);
		cpumask_clear_cpu(cpu, &new_affinity);
	} else {
		/* Only CPU, put on the lowest online CPU */
		cpumask_clear(&new_affinity);
		cpumask_set_cpu(cpumask_first(cpu_online_mask), &new_affinity);
	}
	irq_set_affinity_locked(d, &new_affinity, false);
}
#endif

static int __init bcm7038_l1_init_one(struct device_node *dn,
				      unsigned int idx,
				      struct bcm7038_l1_chip *intc)
{
	struct resource res;
	resource_size_t sz;
	struct bcm7038_l1_cpu *cpu;
	unsigned int i, n_words, parent_irq;
	int ret;

	if (of_address_to_resource(dn, idx, &res))
		return -EINVAL;
	sz = resource_size(&res);
	n_words = sz / REG_BYTES_PER_IRQ_WORD;

	if (n_words > MAX_WORDS)
		return -EINVAL;
	else if (!intc->n_words)
		intc->n_words = n_words;
	else if (intc->n_words != n_words)
		return -EINVAL;

	ret = of_property_read_u32_array(dn , "brcm,int-fwd-mask",
					 intc->irq_fwd_mask, n_words);
	if (ret != 0 && ret != -EINVAL) {
		/* property exists but has the wrong number of words */
		pr_err("invalid brcm,int-fwd-mask property\n");
		return -EINVAL;
	}

	cpu = intc->cpus[idx] = kzalloc(sizeof(*cpu) + n_words * sizeof(u32),
					GFP_KERNEL);
	if (!cpu)
		return -ENOMEM;

	cpu->map_base = ioremap(res.start, sz);
	if (!cpu->map_base)
		return -ENOMEM;

	for (i = 0; i < n_words; i++) {
		l1_writel(~intc->irq_fwd_mask[i],
			  cpu->map_base + reg_mask_set(intc, i));
		l1_writel(intc->irq_fwd_mask[i],
			  cpu->map_base + reg_mask_clr(intc, i));
		cpu->mask_cache[i] = ~intc->irq_fwd_mask[i];
	}

	parent_irq = irq_of_parse_and_map(dn, idx);
	if (!parent_irq) {
		pr_err("failed to map parent interrupt %d\n", parent_irq);
		return -EINVAL;
	}

	if (of_property_read_bool(dn, "brcm,irq-can-wake"))
		enable_irq_wake(parent_irq);

	irq_set_chained_handler_and_data(parent_irq, bcm7038_l1_irq_handle,
					 intc);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
/*
 * We keep a list of bcm7038_l1_chip used for suspend/resume. This hack is
 * used because the struct chip_type suspend/resume hooks are not called
 * unless chip_type is hooked onto a generic_chip. Since this driver does
 * not use generic_chip, we need to manually hook our resume/suspend to
 * syscore_ops.
 */
static LIST_HEAD(bcm7038_l1_intcs_list);
static DEFINE_RAW_SPINLOCK(bcm7038_l1_intcs_lock);

static int bcm7038_l1_suspend(void)
{
	struct bcm7038_l1_chip *intc;
	int boot_cpu, word;
	u32 val;

	/* Wakeup interrupt should only come from the boot cpu */
	boot_cpu = cpu_logical_map(0);

	list_for_each_entry(intc, &bcm7038_l1_intcs_list, list) {
		for (word = 0; word < intc->n_words; word++) {
			val = intc->wake_mask[word] | intc->irq_fwd_mask[word];
			l1_writel(~val,
				intc->cpus[boot_cpu]->map_base + reg_mask_set(intc, word));
			l1_writel(val,
				intc->cpus[boot_cpu]->map_base + reg_mask_clr(intc, word));
		}
	}

	return 0;
}

static void bcm7038_l1_resume(void)
{
	struct bcm7038_l1_chip *intc;
	int boot_cpu, word;

	boot_cpu = cpu_logical_map(0);

	list_for_each_entry(intc, &bcm7038_l1_intcs_list, list) {
		for (word = 0; word < intc->n_words; word++) {
			l1_writel(intc->cpus[boot_cpu]->mask_cache[word],
				intc->cpus[boot_cpu]->map_base + reg_mask_set(intc, word));
			l1_writel(~intc->cpus[boot_cpu]->mask_cache[word],
				intc->cpus[boot_cpu]->map_base + reg_mask_clr(intc, word));
		}
	}
}

static struct syscore_ops bcm7038_l1_syscore_ops = {
	.suspend	= bcm7038_l1_suspend,
	.resume		= bcm7038_l1_resume,
};

static int bcm7038_l1_set_wake(struct irq_data *d, unsigned int on)
{
	struct bcm7038_l1_chip *intc = irq_data_get_irq_chip_data(d);
	unsigned long flags;
	u32 word = d->hwirq / IRQS_PER_WORD;
	u32 mask = BIT(d->hwirq % IRQS_PER_WORD);

	raw_spin_lock_irqsave(&intc->lock, flags);
	if (on)
		intc->wake_mask[word] |= mask;
	else
		intc->wake_mask[word] &= ~mask;
	raw_spin_unlock_irqrestore(&intc->lock, flags);

	return 0;
}
#endif

static struct irq_chip bcm7038_l1_irq_chip = {
	.name			= "bcm7038-l1",
	.irq_mask		= bcm7038_l1_mask,
	.irq_unmask		= bcm7038_l1_unmask,
	.irq_set_affinity	= bcm7038_l1_set_affinity,
#ifdef CONFIG_SMP
	.irq_cpu_offline	= bcm7038_l1_cpu_offline,
#endif
#ifdef CONFIG_PM_SLEEP
	.irq_set_wake		= bcm7038_l1_set_wake,
#endif
};

static int bcm7038_l1_map(struct irq_domain *d, unsigned int virq,
			  irq_hw_number_t hw_irq)
{
	struct bcm7038_l1_chip *intc = d->host_data;
	u32 mask = BIT(hw_irq % IRQS_PER_WORD);
	u32 word = hw_irq / IRQS_PER_WORD;

	if (intc->irq_fwd_mask[word] & mask)
		return -EPERM;

	irq_set_chip_and_handler(virq, &bcm7038_l1_irq_chip, handle_level_irq);
	irq_set_chip_data(virq, d->host_data);
	irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(virq)));
	return 0;
}

static const struct irq_domain_ops bcm7038_l1_domain_ops = {
	.xlate			= irq_domain_xlate_onecell,
	.map			= bcm7038_l1_map,
};

static int __init bcm7038_l1_of_init(struct device_node *dn,
			      struct device_node *parent)
{
	struct bcm7038_l1_chip *intc;
	int idx, ret;

	intc = kzalloc(sizeof(*intc), GFP_KERNEL);
	if (!intc)
		return -ENOMEM;

	raw_spin_lock_init(&intc->lock);
	for_each_possible_cpu(idx) {
		ret = bcm7038_l1_init_one(dn, idx, intc);
		if (ret < 0) {
			if (idx)
				break;
			pr_err("failed to remap intc L1 registers\n");
			goto out_free;
		}
	}

	intc->domain = irq_domain_add_linear(dn, IRQS_PER_WORD * intc->n_words,
					     &bcm7038_l1_domain_ops,
					     intc);
	if (!intc->domain) {
		ret = -ENOMEM;
		goto out_unmap;
	}

#ifdef CONFIG_PM_SLEEP
	/* Add bcm7038_l1_chip into a list */
	raw_spin_lock(&bcm7038_l1_intcs_lock);
	list_add_tail(&intc->list, &bcm7038_l1_intcs_list);
	raw_spin_unlock(&bcm7038_l1_intcs_lock);

	if (list_is_singular(&bcm7038_l1_intcs_list))
		register_syscore_ops(&bcm7038_l1_syscore_ops);
#endif

	pr_info("registered BCM7038 L1 intc (%pOF, IRQs: %d)\n",
		dn, IRQS_PER_WORD * intc->n_words);

	return 0;

out_unmap:
	for_each_possible_cpu(idx) {
		struct bcm7038_l1_cpu *cpu = intc->cpus[idx];

		if (cpu) {
			if (cpu->map_base)
				iounmap(cpu->map_base);
			kfree(cpu);
		}
	}
out_free:
	kfree(intc);
	return ret;
}

IRQCHIP_DECLARE(bcm7038_l1, "brcm,bcm7038-l1-intc", bcm7038_l1_of_init);
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
5f7f0317 KC	2	/*
	3	* Broadcom BCM7038 style Level 1 interrupt controller driver
	4	*
	5	* Copyright (C) 2014 Broadcom Corporation
	6	* Author: Kevin Cernekee
5f7f0317 KC	7	*/
	8
	9	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	10
	11	#include <linux/bitops.h>
5f7f0317 KC	12	#include <linux/kernel.h>
	13	#include <linux/init.h>
	14	#include <linux/interrupt.h>
	15	#include <linux/io.h>
	16	#include <linux/ioport.h>
	17	#include <linux/irq.h>
	18	#include <linux/irqdomain.h>
	19	#include <linux/module.h>
	20	#include <linux/of.h>
	21	#include <linux/of_irq.h>
	22	#include <linux/of_address.h>
	23	#include <linux/of_platform.h>
	24	#include <linux/platform_device.h>
	25	#include <linux/slab.h>
	26	#include <linux/smp.h>
	27	#include <linux/types.h>
41a83e06	28	#include <linux/irqchip.h>
5f7f0317	29	#include <linux/irqchip/chained_irq.h>
6468fc18	30	#include <linux/syscore_ops.h>
52b350cb FF	31	#ifdef CONFIG_ARM
	32	#include <asm/smp_plat.h>
	33	#endif
5f7f0317	34
5f7f0317 KC	35	#define IRQS_PER_WORD 32
	36	#define REG_BYTES_PER_IRQ_WORD (sizeof(u32) * 4)
	37	#define MAX_WORDS 8
	38
	39	struct bcm7038_l1_cpu;
	40
	41	struct bcm7038_l1_chip {
	42	raw_spinlock_t lock;
	43	unsigned int n_words;
	44	struct irq_domain *domain;
	45	struct bcm7038_l1_cpu *cpus[NR_CPUS];
6468fc18 JC	46	#ifdef CONFIG_PM_SLEEP
	47	struct list_head list;
	48	u32 wake_mask[MAX_WORDS];
	49	#endif
96de80c1	50	u32 irq_fwd_mask[MAX_WORDS];
5f7f0317 KC	51	u8 affinity[MAX_WORDS * IRQS_PER_WORD];
	52	};
	53
	54	struct bcm7038_l1_cpu {
	55	void __iomem *map_base;
b2e1cbfd	56	u32 mask_cache[];
5f7f0317 KC	57	};
	58
	59	/*
	60	* STATUS/MASK_STATUS/MASK_SET/MASK_CLEAR are packed one right after another:
	61	*
	62	* 7038:
	63	* 0x1000_1400: W0_STATUS
	64	* 0x1000_1404: W1_STATUS
	65	* 0x1000_1408: W0_MASK_STATUS
	66	* 0x1000_140c: W1_MASK_STATUS
	67	* 0x1000_1410: W0_MASK_SET
	68	* 0x1000_1414: W1_MASK_SET
	69	* 0x1000_1418: W0_MASK_CLEAR
	70	* 0x1000_141c: W1_MASK_CLEAR
	71	*
	72	* 7445:
	73	* 0xf03e_1500: W0_STATUS
	74	* 0xf03e_1504: W1_STATUS
	75	* 0xf03e_1508: W2_STATUS
	76	* 0xf03e_150c: W3_STATUS
	77	* 0xf03e_1510: W4_STATUS
	78	* 0xf03e_1514: W0_MASK_STATUS
	79	* 0xf03e_1518: W1_MASK_STATUS
	80	* [...]
	81	*/
	82
	83	static inline unsigned int reg_status(struct bcm7038_l1_chip *intc,
	84	unsigned int word)
	85	{
	86	return (0 * intc->n_words + word) * sizeof(u32);
	87	}
	88
	89	static inline unsigned int reg_mask_status(struct bcm7038_l1_chip *intc,
	90	unsigned int word)
	91	{
	92	return (1 * intc->n_words + word) * sizeof(u32);
	93	}
	94
	95	static inline unsigned int reg_mask_set(struct bcm7038_l1_chip *intc,
	96	unsigned int word)
	97	{
	98	return (2 * intc->n_words + word) * sizeof(u32);
	99	}
	100
	101	static inline unsigned int reg_mask_clr(struct bcm7038_l1_chip *intc,
	102	unsigned int word)
	103	{
	104	return (3 * intc->n_words + word) * sizeof(u32);
	105	}
	106
	107	static inline u32 l1_readl(void __iomem *reg)
	108	{
	109	if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
	110	return ioread32be(reg);
	111	else
	112	return readl(reg);
	113	}
	114
	115	static inline void l1_writel(u32 val, void __iomem *reg)
	116	{
	117	if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
	118	iowrite32be(val, reg);
	119	else
	120	writel(val, reg);
121	}
122
bd0b9ac4	123	static void bcm7038_l1_irq_handle(struct irq_desc *desc)
5f7f0317 KC	124	{
	125	struct bcm7038_l1_chip *intc = irq_desc_get_handler_data(desc);
	126	struct bcm7038_l1_cpu *cpu;
	127	struct irq_chip *chip = irq_desc_get_chip(desc);
	128	unsigned int idx;
	129
	130	#ifdef CONFIG_SMP
	131	cpu = intc->cpus[cpu_logical_map(smp_processor_id())];
	132	#else
	133	cpu = intc->cpus[0];
	134	#endif
	135
	136	chained_irq_enter(chip, desc);
	137
	138	for (idx = 0; idx < intc->n_words; idx++) {
	139	int base = idx * IRQS_PER_WORD;
	140	unsigned long pending, flags;
	141	int hwirq;
	142
	143	raw_spin_lock_irqsave(&intc->lock, flags);
	144	pending = l1_readl(cpu->map_base + reg_status(intc, idx)) &
	145	~cpu->mask_cache[idx];
	146	raw_spin_unlock_irqrestore(&intc->lock, flags);
	147
	148	for_each_set_bit(hwirq, &pending, IRQS_PER_WORD) {
	149	generic_handle_irq(irq_find_mapping(intc->domain,
	150	base + hwirq));
	151	}
	152	}
	153
	154	chained_irq_exit(chip, desc);
	155	}
	156
	157	static void __bcm7038_l1_unmask(struct irq_data *d, unsigned int cpu_idx)
	158	{
	159	struct bcm7038_l1_chip *intc = irq_data_get_irq_chip_data(d);
	160	u32 word = d->hwirq / IRQS_PER_WORD;
	161	u32 mask = BIT(d->hwirq % IRQS_PER_WORD);
	162
	163	intc->cpus[cpu_idx]->mask_cache[word] &= ~mask;
	164	l1_writel(mask, intc->cpus[cpu_idx]->map_base +
	165	reg_mask_clr(intc, word));
	166	}
	167
	168	static void __bcm7038_l1_mask(struct irq_data *d, unsigned int cpu_idx)
	169	{
	170	struct bcm7038_l1_chip *intc = irq_data_get_irq_chip_data(d);
	171	u32 word = d->hwirq / IRQS_PER_WORD;
	172	u32 mask = BIT(d->hwirq % IRQS_PER_WORD);
	173
	174	intc->cpus[cpu_idx]->mask_cache[word] \|= mask;
	175	l1_writel(mask, intc->cpus[cpu_idx]->map_base +
	176	reg_mask_set(intc, word));
	177	}
	178
	179	static void bcm7038_l1_unmask(struct irq_data *d)
	180	{
	181	struct bcm7038_l1_chip *intc = irq_data_get_irq_chip_data(d);
	182	unsigned long flags;
	183
	184	raw_spin_lock_irqsave(&intc->lock, flags);
	185	__bcm7038_l1_unmask(d, intc->affinity[d->hwirq]);
	186	raw_spin_unlock_irqrestore(&intc->lock, flags);
	187	}
188
189	static void bcm7038_l1_mask(struct irq_data *d)
190	{
191	struct bcm7038_l1_chip *intc = irq_data_get_irq_chip_data(d);
192	unsigned long flags;
193
194	raw_spin_lock_irqsave(&intc->lock, flags);
195	__bcm7038_l1_mask(d, intc->affinity[d->hwirq]);
196	raw_spin_unlock_irqrestore(&intc->lock, flags);
197	}
198
199	static int bcm7038_l1_set_affinity(struct irq_data *d,
200	const struct cpumask *dest,
201	bool force)
202	{
203	struct bcm7038_l1_chip *intc = irq_data_get_irq_chip_data(d);
204	unsigned long flags;
205	irq_hw_number_t hw = d->hwirq;
206	u32 word = hw / IRQS_PER_WORD;
207	u32 mask = BIT(hw % IRQS_PER_WORD);
208	unsigned int first_cpu = cpumask_any_and(dest, cpu_online_mask);
209	bool was_disabled;
210
211	raw_spin_lock_irqsave(&intc->lock, flags);
212
213	was_disabled = !!(intc->cpus[intc->affinity[hw]]->mask_cache[word] &
214	mask);
215	__bcm7038_l1_mask(d, intc->affinity[hw]);
216	intc->affinity[hw] = first_cpu;
217	if (!was_disabled)
218	__bcm7038_l1_unmask(d, first_cpu);
219
220	raw_spin_unlock_irqrestore(&intc->lock, flags);
b8d9884a MZ	221	irq_data_update_effective_affinity(d, cpumask_of(first_cpu));
b8d9884a MZ	222
5f7f0317 KC	223	return 0;
	224	}
	225
0702bc4d	226	#ifdef CONFIG_SMP
34c53579 FF	227	static void bcm7038_l1_cpu_offline(struct irq_data *d)
	228	{
	229	struct cpumask *mask = irq_data_get_affinity_mask(d);
	230	int cpu = smp_processor_id();
	231	cpumask_t new_affinity;
	232
	233	/* This CPU was not on the affinity mask */
	234	if (!cpumask_test_cpu(cpu, mask))
	235	return;
	236
	237	if (cpumask_weight(mask) > 1) {
	238	/*
	239	* Multiple CPU affinity, remove this CPU from the affinity
	240	* mask
	241	*/
	242	cpumask_copy(&new_affinity, mask);
	243	cpumask_clear_cpu(cpu, &new_affinity);
	244	} else {
	245	/* Only CPU, put on the lowest online CPU */
	246	cpumask_clear(&new_affinity);
	247	cpumask_set_cpu(cpumask_first(cpu_online_mask), &new_affinity);
	248	}
	249	irq_set_affinity_locked(d, &new_affinity, false);
	250	}
0702bc4d	251	#endif
34c53579	252
5f7f0317 KC	253	static int __init bcm7038_l1_init_one(struct device_node *dn,
	254	unsigned int idx,
	255	struct bcm7038_l1_chip *intc)
	256	{
	257	struct resource res;
	258	resource_size_t sz;
	259	struct bcm7038_l1_cpu *cpu;
	260	unsigned int i, n_words, parent_irq;
96de80c1	261	int ret;
5f7f0317 KC	262
	263	if (of_address_to_resource(dn, idx, &res))
	264	return -EINVAL;
	265	sz = resource_size(&res);
	266	n_words = sz / REG_BYTES_PER_IRQ_WORD;
	267
	268	if (n_words > MAX_WORDS)
	269	return -EINVAL;
	270	else if (!intc->n_words)
	271	intc->n_words = n_words;
	272	else if (intc->n_words != n_words)
	273	return -EINVAL;
	274
96de80c1 FF	275	ret = of_property_read_u32_array(dn , "brcm,int-fwd-mask",
	276	intc->irq_fwd_mask, n_words);
	277	if (ret != 0 && ret != -EINVAL) {
	278	/* property exists but has the wrong number of words */
	279	pr_err("invalid brcm,int-fwd-mask property\n");
	280	return -EINVAL;
	281	}
	282
5f7f0317 KC	283	cpu = intc->cpus[idx] = kzalloc(sizeof(cpu) + n_words sizeof(u32),
	284	GFP_KERNEL);
	285	if (!cpu)
	286	return -ENOMEM;
	287
	288	cpu->map_base = ioremap(res.start, sz);
	289	if (!cpu->map_base)
	290	return -ENOMEM;
	291
	292	for (i = 0; i < n_words; i++) {
96de80c1 FF	293	l1_writel(~intc->irq_fwd_mask[i],
	294	cpu->map_base + reg_mask_set(intc, i));
	295	l1_writel(intc->irq_fwd_mask[i],
	296	cpu->map_base + reg_mask_clr(intc, i));
	297	cpu->mask_cache[i] = ~intc->irq_fwd_mask[i];
5f7f0317 KC	298	}
	299
	300	parent_irq = irq_of_parse_and_map(dn, idx);
	301	if (!parent_irq) {
	302	pr_err("failed to map parent interrupt %d\n", parent_irq);
	303	return -EINVAL;
	304	}
27eebb60 FF	305
	306	if (of_property_read_bool(dn, "brcm,irq-can-wake"))
	307	enable_irq_wake(parent_irq);
	308
3a7946ee TG	309	irq_set_chained_handler_and_data(parent_irq, bcm7038_l1_irq_handle,
3a7946ee TG	310	intc);
5f7f0317 KC	311
	312	return 0;
	313	}
	314
6468fc18 JC	315	#ifdef CONFIG_PM_SLEEP
	316	/*
	317	* We keep a list of bcm7038_l1_chip used for suspend/resume. This hack is
	318	* used because the struct chip_type suspend/resume hooks are not called
	319	* unless chip_type is hooked onto a generic_chip. Since this driver does
	320	* not use generic_chip, we need to manually hook our resume/suspend to
	321	* syscore_ops.
	322	*/
	323	static LIST_HEAD(bcm7038_l1_intcs_list);
	324	static DEFINE_RAW_SPINLOCK(bcm7038_l1_intcs_lock);
	325
	326	static int bcm7038_l1_suspend(void)
	327	{
	328	struct bcm7038_l1_chip *intc;
	329	int boot_cpu, word;
96de80c1	330	u32 val;
6468fc18 JC	331
	332	/* Wakeup interrupt should only come from the boot cpu */
	333	boot_cpu = cpu_logical_map(0);
	334
	335	list_for_each_entry(intc, &bcm7038_l1_intcs_list, list) {
	336	for (word = 0; word < intc->n_words; word++) {
96de80c1 FF	337	val = intc->wake_mask[word] \| intc->irq_fwd_mask[word];
96de80c1 FF	338	l1_writel(~val,
6468fc18	339	intc->cpus[boot_cpu]->map_base + reg_mask_set(intc, word));
96de80c1	340	l1_writel(val,
6468fc18 JC	341	intc->cpus[boot_cpu]->map_base + reg_mask_clr(intc, word));
	342	}
	343	}
	344
	345	return 0;
	346	}
	347
	348	static void bcm7038_l1_resume(void)
	349	{
	350	struct bcm7038_l1_chip *intc;
	351	int boot_cpu, word;
	352
	353	boot_cpu = cpu_logical_map(0);
	354
	355	list_for_each_entry(intc, &bcm7038_l1_intcs_list, list) {
	356	for (word = 0; word < intc->n_words; word++) {
	357	l1_writel(intc->cpus[boot_cpu]->mask_cache[word],
	358	intc->cpus[boot_cpu]->map_base + reg_mask_set(intc, word));
	359	l1_writel(~intc->cpus[boot_cpu]->mask_cache[word],
	360	intc->cpus[boot_cpu]->map_base + reg_mask_clr(intc, word));
	361	}
	362	}
	363	}
	364
	365	static struct syscore_ops bcm7038_l1_syscore_ops = {
	366	.suspend = bcm7038_l1_suspend,
	367	.resume = bcm7038_l1_resume,
	368	};
	369
	370	static int bcm7038_l1_set_wake(struct irq_data *d, unsigned int on)
	371	{
	372	struct bcm7038_l1_chip *intc = irq_data_get_irq_chip_data(d);
	373	unsigned long flags;
	374	u32 word = d->hwirq / IRQS_PER_WORD;
	375	u32 mask = BIT(d->hwirq % IRQS_PER_WORD);
	376
	377	raw_spin_lock_irqsave(&intc->lock, flags);
	378	if (on)
	379	intc->wake_mask[word] \|= mask;
	380	else
	381	intc->wake_mask[word] &= ~mask;
	382	raw_spin_unlock_irqrestore(&intc->lock, flags);
	383
	384	return 0;
	385	}
	386	#endif
	387
5f7f0317 KC	388	static struct irq_chip bcm7038_l1_irq_chip = {
	389	.name = "bcm7038-l1",
	390	.irq_mask = bcm7038_l1_mask,
	391	.irq_unmask = bcm7038_l1_unmask,
	392	.irq_set_affinity = bcm7038_l1_set_affinity,
0702bc4d	393	#ifdef CONFIG_SMP
34c53579	394	.irq_cpu_offline = bcm7038_l1_cpu_offline,
0702bc4d	395	#endif
6468fc18 JC	396	#ifdef CONFIG_PM_SLEEP
	397	.irq_set_wake = bcm7038_l1_set_wake,
	398	#endif
5f7f0317 KC	399	};
	400
	401	static int bcm7038_l1_map(struct irq_domain *d, unsigned int virq,
	402	irq_hw_number_t hw_irq)
	403	{
96de80c1 FF	404	struct bcm7038_l1_chip *intc = d->host_data;
	405	u32 mask = BIT(hw_irq % IRQS_PER_WORD);
	406	u32 word = hw_irq / IRQS_PER_WORD;
	407
	408	if (intc->irq_fwd_mask[word] & mask)
	409	return -EPERM;
	410
5f7f0317 KC	411	irq_set_chip_and_handler(virq, &bcm7038_l1_irq_chip, handle_level_irq);
5f7f0317 KC	412	irq_set_chip_data(virq, d->host_data);
b8d9884a	413	irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(virq)));
5f7f0317 KC	414	return 0;
	415	}
	416
	417	static const struct irq_domain_ops bcm7038_l1_domain_ops = {
	418	.xlate = irq_domain_xlate_onecell,
	419	.map = bcm7038_l1_map,
	420	};
	421
8f374923	422	static int __init bcm7038_l1_of_init(struct device_node *dn,
5f7f0317 KC	423	struct device_node *parent)
	424	{
	425	struct bcm7038_l1_chip *intc;
	426	int idx, ret;
	427
	428	intc = kzalloc(sizeof(*intc), GFP_KERNEL);
	429	if (!intc)
	430	return -ENOMEM;
	431
	432	raw_spin_lock_init(&intc->lock);
	433	for_each_possible_cpu(idx) {
	434	ret = bcm7038_l1_init_one(dn, idx, intc);
	435	if (ret < 0) {
	436	if (idx)
	437	break;
	438	pr_err("failed to remap intc L1 registers\n");
	439	goto out_free;
	440	}
	441	}
	442
	443	intc->domain = irq_domain_add_linear(dn, IRQS_PER_WORD * intc->n_words,
	444	&bcm7038_l1_domain_ops,
	445	intc);
	446	if (!intc->domain) {
	447	ret = -ENOMEM;
	448	goto out_unmap;
	449	}
	450
6468fc18 JC	451	#ifdef CONFIG_PM_SLEEP
	452	/* Add bcm7038_l1_chip into a list */
	453	raw_spin_lock(&bcm7038_l1_intcs_lock);
	454	list_add_tail(&intc->list, &bcm7038_l1_intcs_list);
	455	raw_spin_unlock(&bcm7038_l1_intcs_lock);
	456
	457	if (list_is_singular(&bcm7038_l1_intcs_list))
	458	register_syscore_ops(&bcm7038_l1_syscore_ops);
	459	#endif
	460
082ce27f FF	461	pr_info("registered BCM7038 L1 intc (%pOF, IRQs: %d)\n",
	462	dn, IRQS_PER_WORD * intc->n_words);
	463
5f7f0317 KC	464	return 0;
	465
	466	out_unmap:
	467	for_each_possible_cpu(idx) {
	468	struct bcm7038_l1_cpu *cpu = intc->cpus[idx];
	469
	470	if (cpu) {
	471	if (cpu->map_base)
	472	iounmap(cpu->map_base);
	473	kfree(cpu);
	474	}
	475	}
	476	out_free:
	477	kfree(intc);
	478	return ret;
	479	}
	480
	481	IRQCHIP_DECLARE(bcm7038_l1, "brcm,bcm7038-l1-intc", bcm7038_l1_of_init);