2 * Broadcom BCM7120 style Level 2 interrupt controller driver
4 * Copyright (C) 2014 Broadcom Corporation
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13 #include <linux/init.h>
14 #include <linux/slab.h>
15 #include <linux/module.h>
16 #include <linux/platform_device.h>
18 #include <linux/of_irq.h>
19 #include <linux/of_address.h>
20 #include <linux/of_platform.h>
21 #include <linux/interrupt.h>
22 #include <linux/irq.h>
24 #include <linux/irqdomain.h>
25 #include <linux/reboot.h>
26 #include <linux/irqchip/chained_irq.h>
30 #include <asm/mach/irq.h>
32 /* Register offset in the L2 interrupt controller */
36 struct bcm7120_l2_intc_data {
38 struct irq_domain *domain;
45 static void bcm7120_l2_intc_irq_handle(unsigned int irq, struct irq_desc *desc)
47 struct bcm7120_l2_intc_data *b = irq_desc_get_handler_data(desc);
48 struct irq_chip *chip = irq_desc_get_chip(desc);
51 chained_irq_enter(chip, desc);
53 status = __raw_readl(b->base + IRQSTAT);
56 do_bad_IRQ(irq, desc);
61 irq = ffs(status) - 1;
62 status &= ~(1 << irq);
63 generic_handle_irq(irq_find_mapping(b->domain, irq));
67 chained_irq_exit(chip, desc);
70 static void bcm7120_l2_intc_suspend(struct irq_data *d)
72 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
73 struct bcm7120_l2_intc_data *b = gc->private;
77 /* Save the current mask and the interrupt forward mask */
78 b->saved_mask = __raw_readl(b->base) | b->irq_fwd_mask;
80 reg = b->saved_mask | gc->wake_active;
81 __raw_writel(reg, b->base);
86 static void bcm7120_l2_intc_resume(struct irq_data *d)
88 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
89 struct bcm7120_l2_intc_data *b = gc->private;
91 /* Restore the saved mask */
93 __raw_writel(b->saved_mask, b->base);
97 static int bcm7120_l2_intc_init_one(struct device_node *dn,
98 struct bcm7120_l2_intc_data *data,
99 int irq, const __be32 *map_mask)
103 parent_irq = irq_of_parse_and_map(dn, irq);
104 if (parent_irq < 0) {
105 pr_err("failed to map interrupt %d\n", irq);
109 data->irq_map_mask |= be32_to_cpup(map_mask + irq);
111 irq_set_handler_data(parent_irq, data);
112 irq_set_chained_handler(parent_irq, bcm7120_l2_intc_irq_handle);
117 int __init bcm7120_l2_intc_of_init(struct device_node *dn,
118 struct device_node *parent)
120 unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
121 struct bcm7120_l2_intc_data *data;
122 struct irq_chip_generic *gc;
123 struct irq_chip_type *ct;
124 const __be32 *map_mask;
126 int ret = 0, len, irq;
128 data = kzalloc(sizeof(*data), GFP_KERNEL);
132 data->base = of_iomap(dn, 0);
134 pr_err("failed to remap intc L2 registers\n");
139 if (of_property_read_u32(dn, "brcm,int-fwd-mask", &data->irq_fwd_mask))
140 data->irq_fwd_mask = 0;
142 /* Enable all interrupt specified in the interrupt forward mask and have
145 __raw_writel(data->irq_fwd_mask, data->base + IRQEN);
147 num_parent_irqs = of_irq_count(dn);
148 if (num_parent_irqs <= 0) {
149 pr_err("invalid number of parent interrupts\n");
154 map_mask = of_get_property(dn, "brcm,int-map-mask", &len);
155 if (!map_mask || (len != (sizeof(*map_mask) * num_parent_irqs))) {
156 pr_err("invalid brcm,int-map-mask property\n");
161 for (irq = 0; irq < num_parent_irqs; irq++) {
162 ret = bcm7120_l2_intc_init_one(dn, data, irq, map_mask);
167 data->domain = irq_domain_add_linear(dn, 32,
168 &irq_generic_chip_ops, NULL);
174 ret = irq_alloc_domain_generic_chips(data->domain, 32, 1,
175 dn->full_name, handle_level_irq, clr, 0,
176 IRQ_GC_INIT_MASK_CACHE);
178 pr_err("failed to allocate generic irq chip\n");
179 goto out_free_domain;
182 gc = irq_get_domain_generic_chip(data->domain, 0);
183 gc->unused = 0xfffffff & ~data->irq_map_mask;
184 gc->reg_base = data->base;
188 ct->regs.mask = IRQEN;
189 ct->chip.irq_mask = irq_gc_mask_clr_bit;
190 ct->chip.irq_unmask = irq_gc_mask_set_bit;
191 ct->chip.irq_ack = irq_gc_noop;
192 ct->chip.irq_suspend = bcm7120_l2_intc_suspend;
193 ct->chip.irq_resume = bcm7120_l2_intc_resume;
195 if (of_property_read_bool(dn, "brcm,irq-can-wake")) {
196 data->can_wake = true;
197 /* This IRQ chip can wake the system, set all relevant child
198 * interupts in wake_enabled mask
200 gc->wake_enabled = 0xffffffff;
201 gc->wake_enabled &= ~gc->unused;
202 ct->chip.irq_set_wake = irq_gc_set_wake;
205 pr_info("registered BCM7120 L2 intc (mem: 0x%p, parent IRQ(s): %d)\n",
206 data->base, num_parent_irqs);
211 irq_domain_remove(data->domain);
218 IRQCHIP_DECLARE(brcmstb_l2_intc, "brcm,bcm7120-l2-intc",
219 bcm7120_l2_intc_of_init);