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linux-next/drivers/irqchip/irq-bcm7038-l1.c
Thomas Gleixner bd0b9ac405 genirq: Remove irq argument from irq flow handlers 
Most interrupt flow handlers do not use the irq argument. Those few
which use it can retrieve the irq number from the irq descriptor.

Remove the argument.

Search and replace was done with coccinelle and some extra helper
scripts around it. Thanks to Julia for her help!

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Julia Lawall <Julia.Lawall@lip6.fr>
Cc: Jiang Liu <jiang.liu@linux.intel.com>
2015-09-16 15:47:51 +02:00

335 lines
8.2 KiB
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/*
* Broadcom BCM7038 style Level 1 interrupt controller driver
*
* Copyright (C) 2014 Broadcom Corporation
* Author: Kevin Cernekee
*
* 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/bitops.h>
#include <linux/kconfig.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>
#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];
u8 affinity[MAX_WORDS * IRQS_PER_WORD];
};
struct bcm7038_l1_cpu {
void __iomem *map_base;
u32 mask_cache[0];
};
/*
* 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);
return 0;
}
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;
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;
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(0xffffffff, cpu->map_base + reg_mask_set(intc, i));
cpu->mask_cache[i] = 0xffffffff;
}
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;
}
irq_set_chained_handler_and_data(parent_irq, bcm7038_l1_irq_handle,
intc);
return 0;
}
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,
};
static int bcm7038_l1_map(struct irq_domain *d, unsigned int virq,
irq_hw_number_t hw_irq)
{
irq_set_chip_and_handler(virq, &bcm7038_l1_irq_chip, handle_level_irq);
irq_set_chip_data(virq, d->host_data);
return 0;
}
static const struct irq_domain_ops bcm7038_l1_domain_ops = {
.xlate = irq_domain_xlate_onecell,
.map = bcm7038_l1_map,
};
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;
}
pr_info("registered BCM7038 L1 intc (mem: 0x%p, IRQs: %d)\n",
intc->cpus[0]->map_base, 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);
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