irqchip: bcm7120-l2: Add Broadcom BCM7120-style Level 2 interrupt controller
This patch adds support for the Level-2 interrupt controller hardware found in Broadcom Set Top Box System-on-a-Chip devices. This interrupt controller is implemented using a single enable register. This interrupt controller is always present on the platforms supported by the irq-brcmstb-l2 driver, hence the reason why both are compiled using the same Kconfig symbol. [jac] removed the following warning: drivers/irqchip/irq-bcm7120-l2.c: In function 'bcm7120_l2_intc_irq_handle': drivers/irqchip/irq-bcm7120-l2.c:49:27: warning: unused variable 'gc' [-Wunused-variable] Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Link: https://lkml.kernel.org/r/1410309862-27784-2-git-send-email-f.fainelli@gmail.com Signed-off-by: Jason Cooper <jason@lakedaemon.net>
This commit is contained in:
Florian Fainelli
Jason Cooper
parent
7d1311b93e
commit
a5042de268
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@ -33,4 +33,5 @@ obj-$(CONFIG_TB10X_IRQC) += irq-tb10x.o
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obj-$(CONFIG_XTENSA) += irq-xtensa-pic.o
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obj-$(CONFIG_XTENSA_MX) += irq-xtensa-mx.o
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obj-$(CONFIG_IRQ_CROSSBAR) += irq-crossbar.o
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obj-$(CONFIG_BRCMSTB_L2_IRQ) += irq-brcmstb-l2.o
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obj-$(CONFIG_BRCMSTB_L2_IRQ) += irq-brcmstb-l2.o \
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irq-bcm7120-l2.o
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@ -0,0 +1,219 @@
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/*
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* Broadcom BCM7120 style Level 2 interrupt controller driver
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*
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* Copyright (C) 2014 Broadcom Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/of.h>
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#include <linux/of_irq.h>
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#include <linux/of_address.h>
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#include <linux/of_platform.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/io.h>
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#include <linux/irqdomain.h>
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#include <linux/reboot.h>
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#include <linux/irqchip/chained_irq.h>
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#include "irqchip.h"
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#include <asm/mach/irq.h>
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/* Register offset in the L2 interrupt controller */
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#define IRQEN 0x00
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#define IRQSTAT 0x04
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struct bcm7120_l2_intc_data {
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void __iomem *base;
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struct irq_domain *domain;
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bool can_wake;
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u32 irq_fwd_mask;
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u32 irq_map_mask;
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u32 saved_mask;
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};
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static void bcm7120_l2_intc_irq_handle(unsigned int irq, struct irq_desc *desc)
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{
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struct bcm7120_l2_intc_data *b = irq_desc_get_handler_data(desc);
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struct irq_chip *chip = irq_desc_get_chip(desc);
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u32 status;
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chained_irq_enter(chip, desc);
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status = __raw_readl(b->base + IRQSTAT);
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if (status == 0) {
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do_bad_IRQ(irq, desc);
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goto out;
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}
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do {
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irq = ffs(status) - 1;
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status &= ~(1 << irq);
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generic_handle_irq(irq_find_mapping(b->domain, irq));
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} while (status);
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out:
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chained_irq_exit(chip, desc);
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}
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static void bcm7120_l2_intc_suspend(struct irq_data *d)
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{
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struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
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struct bcm7120_l2_intc_data *b = gc->private;
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u32 reg;
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irq_gc_lock(gc);
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/* Save the current mask and the interrupt forward mask */
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b->saved_mask = __raw_readl(b->base) | b->irq_fwd_mask;
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if (b->can_wake) {
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reg = b->saved_mask | gc->wake_active;
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__raw_writel(reg, b->base);
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}
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irq_gc_unlock(gc);
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}
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static void bcm7120_l2_intc_resume(struct irq_data *d)
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{
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struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
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struct bcm7120_l2_intc_data *b = gc->private;
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/* Restore the saved mask */
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irq_gc_lock(gc);
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__raw_writel(b->saved_mask, b->base);
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irq_gc_unlock(gc);
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}
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static int bcm7120_l2_intc_init_one(struct device_node *dn,
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struct bcm7120_l2_intc_data *data,
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int irq, const __be32 *map_mask)
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{
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int parent_irq;
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parent_irq = irq_of_parse_and_map(dn, irq);
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if (parent_irq < 0) {
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pr_err("failed to map interrupt %d\n", irq);
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return parent_irq;
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}
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data->irq_map_mask |= be32_to_cpup(map_mask + irq);
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irq_set_handler_data(parent_irq, data);
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irq_set_chained_handler(parent_irq, bcm7120_l2_intc_irq_handle);
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return 0;
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}
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int __init bcm7120_l2_intc_of_init(struct device_node *dn,
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struct device_node *parent)
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{
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unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
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struct bcm7120_l2_intc_data *data;
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struct irq_chip_generic *gc;
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struct irq_chip_type *ct;
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const __be32 *map_mask;
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int num_parent_irqs;
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int ret = 0, len, irq;
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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->base = of_iomap(dn, 0);
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if (!data->base) {
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pr_err("failed to remap intc L2 registers\n");
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ret = -ENOMEM;
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goto out_free;
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}
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if (of_property_read_u32(dn, "brcm,int-fwd-mask", &data->irq_fwd_mask))
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data->irq_fwd_mask = 0;
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/* Enable all interrupt specified in the interrupt forward mask and have
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* the other disabled
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*/
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__raw_writel(data->irq_fwd_mask, data->base + IRQEN);
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num_parent_irqs = of_irq_count(dn);
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if (num_parent_irqs <= 0) {
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pr_err("invalid number of parent interrupts\n");
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ret = -ENOMEM;
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goto out_unmap;
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}
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map_mask = of_get_property(dn, "brcm,int-map-mask", &len);
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if (!map_mask || (len != (sizeof(*map_mask) * num_parent_irqs))) {
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pr_err("invalid brcm,int-map-mask property\n");
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ret = -EINVAL;
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goto out_unmap;
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}
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for (irq = 0; irq < num_parent_irqs; irq++) {
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ret = bcm7120_l2_intc_init_one(dn, data, irq, map_mask);
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if (ret)
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goto out_unmap;
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}
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data->domain = irq_domain_add_linear(dn, 32,
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&irq_generic_chip_ops, NULL);
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if (!data->domain) {
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ret = -ENOMEM;
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goto out_unmap;
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}
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ret = irq_alloc_domain_generic_chips(data->domain, 32, 1,
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dn->full_name, handle_level_irq, clr, 0,
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IRQ_GC_INIT_MASK_CACHE);
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if (ret) {
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pr_err("failed to allocate generic irq chip\n");
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goto out_free_domain;
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}
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gc = irq_get_domain_generic_chip(data->domain, 0);
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gc->unused = 0xfffffff & ~data->irq_map_mask;
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gc->reg_base = data->base;
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gc->private = data;
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ct = gc->chip_types;
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ct->regs.mask = IRQEN;
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ct->chip.irq_mask = irq_gc_mask_clr_bit;
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ct->chip.irq_unmask = irq_gc_mask_set_bit;
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ct->chip.irq_ack = irq_gc_noop;
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ct->chip.irq_suspend = bcm7120_l2_intc_suspend;
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ct->chip.irq_resume = bcm7120_l2_intc_resume;
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if (of_property_read_bool(dn, "brcm,irq-can-wake")) {
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data->can_wake = true;
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/* This IRQ chip can wake the system, set all relevant child
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* interupts in wake_enabled mask
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*/
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gc->wake_enabled = 0xffffffff;
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gc->wake_enabled &= ~gc->unused;
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ct->chip.irq_set_wake = irq_gc_set_wake;
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}
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pr_info("registered BCM7120 L2 intc (mem: 0x%p, parent IRQ(s): %d)\n",
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data->base, num_parent_irqs);
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return 0;
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out_free_domain:
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irq_domain_remove(data->domain);
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out_unmap:
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iounmap(data->base);
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out_free:
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kfree(data);
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return ret;
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}
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IRQCHIP_DECLARE(brcmstb_l2_intc, "brcm,bcm7120-l2-intc",
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bcm7120_l2_intc_of_init);
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