diff options
Diffstat (limited to 'drivers/irqchip/irq-bcm7120-l2.c')
| -rw-r--r-- | drivers/irqchip/irq-bcm7120-l2.c | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-bcm7120-l2.c b/drivers/irqchip/irq-bcm7120-l2.c new file mode 100644 index 000000000000..b9f4fb808e49 --- /dev/null +++ b/drivers/irqchip/irq-bcm7120-l2.c @@ -0,0 +1,219 @@ +/* + * Broadcom BCM7120 style Level 2 interrupt controller driver + * + * Copyright (C) 2014 Broadcom Corporation + * + * 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. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/of_address.h> +#include <linux/of_platform.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/io.h> +#include <linux/irqdomain.h> +#include <linux/reboot.h> +#include <linux/irqchip/chained_irq.h> + +#include "irqchip.h" + +#include <asm/mach/irq.h> + +/* Register offset in the L2 interrupt controller */ +#define IRQEN 0x00 +#define IRQSTAT 0x04 + +struct bcm7120_l2_intc_data { + void __iomem *base; + struct irq_domain *domain; + bool can_wake; + u32 irq_fwd_mask; + u32 irq_map_mask; + u32 saved_mask; +}; + +static void bcm7120_l2_intc_irq_handle(unsigned int irq, struct irq_desc *desc) +{ + struct bcm7120_l2_intc_data *b = irq_desc_get_handler_data(desc); + struct irq_chip *chip = irq_desc_get_chip(desc); + u32 status; + + chained_irq_enter(chip, desc); + + status = __raw_readl(b->base + IRQSTAT); + + if (status == 0) { + do_bad_IRQ(irq, desc); + goto out; + } + + do { + irq = ffs(status) - 1; + status &= ~(1 << irq); + generic_handle_irq(irq_find_mapping(b->domain, irq)); + } while (status); + +out: + chained_irq_exit(chip, desc); +} + +static void bcm7120_l2_intc_suspend(struct irq_data *d) +{ + struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); + struct bcm7120_l2_intc_data *b = gc->private; + u32 reg; + + irq_gc_lock(gc); + /* Save the current mask and the interrupt forward mask */ + b->saved_mask = __raw_readl(b->base) | b->irq_fwd_mask; + if (b->can_wake) { + reg = b->saved_mask | gc->wake_active; + __raw_writel(reg, b->base); + } + irq_gc_unlock(gc); +} + +static void bcm7120_l2_intc_resume(struct irq_data *d) +{ + struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); + struct bcm7120_l2_intc_data *b = gc->private; + + /* Restore the saved mask */ + irq_gc_lock(gc); + __raw_writel(b->saved_mask, b->base); + irq_gc_unlock(gc); +} + +static int bcm7120_l2_intc_init_one(struct device_node *dn, + struct bcm7120_l2_intc_data *data, + int irq, const __be32 *map_mask) +{ + int parent_irq; + + parent_irq = irq_of_parse_and_map(dn, irq); + if (parent_irq < 0) { + pr_err("failed to map interrupt %d\n", irq); + return parent_irq; + } + + data->irq_map_mask |= be32_to_cpup(map_mask + irq); + + irq_set_handler_data(parent_irq, data); + irq_set_chained_handler(parent_irq, bcm7120_l2_intc_irq_handle); + + return 0; +} + +int __init bcm7120_l2_intc_of_init(struct device_node *dn, + struct device_node *parent) +{ + unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN; + struct bcm7120_l2_intc_data *data; + struct irq_chip_generic *gc; + struct irq_chip_type *ct; + const __be32 *map_mask; + int num_parent_irqs; + int ret = 0, len, irq; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->base = of_iomap(dn, 0); + if (!data->base) { + pr_err("failed to remap intc L2 registers\n"); + ret = -ENOMEM; + goto out_free; + } + + if (of_property_read_u32(dn, "brcm,int-fwd-mask", &data->irq_fwd_mask)) + data->irq_fwd_mask = 0; + + /* Enable all interrupt specified in the interrupt forward mask and have + * the other disabled + */ + __raw_writel(data->irq_fwd_mask, data->base + IRQEN); + + num_parent_irqs = of_irq_count(dn); + if (num_parent_irqs <= 0) { + pr_err("invalid number of parent interrupts\n"); + ret = -ENOMEM; + goto out_unmap; + } + + map_mask = of_get_property(dn, "brcm,int-map-mask", &len); + if (!map_mask || (len != (sizeof(*map_mask) * num_parent_irqs))) { + pr_err("invalid brcm,int-map-mask property\n"); + ret = -EINVAL; + goto out_unmap; + } + + for (irq = 0; irq < num_parent_irqs; irq++) { + ret = bcm7120_l2_intc_init_one(dn, data, irq, map_mask); + if (ret) + goto out_unmap; + } + + data->domain = irq_domain_add_linear(dn, 32, + &irq_generic_chip_ops, NULL); + if (!data->domain) { + ret = -ENOMEM; + goto out_unmap; + } + + ret = irq_alloc_domain_generic_chips(data->domain, 32, 1, + dn->full_name, handle_level_irq, clr, 0, + IRQ_GC_INIT_MASK_CACHE); + if (ret) { + pr_err("failed to allocate generic irq chip\n"); + goto out_free_domain; + } + + gc = irq_get_domain_generic_chip(data->domain, 0); + gc->unused = 0xfffffff & ~data->irq_map_mask; + gc->reg_base = data->base; + gc->private = data; + ct = gc->chip_types; + + ct->regs.mask = IRQEN; + ct->chip.irq_mask = irq_gc_mask_clr_bit; + ct->chip.irq_unmask = irq_gc_mask_set_bit; + ct->chip.irq_ack = irq_gc_noop; + ct->chip.irq_suspend = bcm7120_l2_intc_suspend; + ct->chip.irq_resume = bcm7120_l2_intc_resume; + + if (of_property_read_bool(dn, "brcm,irq-can-wake")) { + data->can_wake = true; + /* This IRQ chip can wake the system, set all relevant child + * interupts in wake_enabled mask + */ + gc->wake_enabled = 0xffffffff; + gc->wake_enabled &= ~gc->unused; + ct->chip.irq_set_wake = irq_gc_set_wake; + } + + pr_info("registered BCM7120 L2 intc (mem: 0x%p, parent IRQ(s): %d)\n", + data->base, num_parent_irqs); + + return 0; + +out_free_domain: + irq_domain_remove(data->domain); +out_unmap: + iounmap(data->base); +out_free: + kfree(data); + return ret; +} +IRQCHIP_DECLARE(brcmstb_l2_intc, "brcm,bcm7120-l2-intc", + bcm7120_l2_intc_of_init); |