From 05e32e9dc84ee96728596c0b8b86de7eae8de229 Mon Sep 17 00:00:00 2001
From: Jonas Gorski <jogo@openwrt.org>
Date: Sun, 21 Apr 2013 15:38:56 +0200
Subject: [PATCH 11/14] MIPS: BCM63XX: protect irq register accesses
---
arch/mips/bcm63xx/irq.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
--- a/arch/mips/bcm63xx/irq.c
+++ b/arch/mips/bcm63xx/irq.c
@@ -12,6 +12,7 @@
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/irq.h>
+#include <linux/spinlock.h>
#include <asm/irq_cpu.h>
#include <asm/mipsregs.h>
#include <bcm63xx_cpu.h>
@@ -26,6 +27,9 @@ static void __internal_irq_mask_64(unsig
static void __internal_irq_unmask_32(unsigned int irq) __maybe_unused;
static void __internal_irq_unmask_64(unsigned int irq) __maybe_unused;
+static DEFINE_SPINLOCK(ipic_lock);
+static DEFINE_SPINLOCK(epic_lock);
+
#ifndef BCMCPU_RUNTIME_DETECT
#ifdef CONFIG_BCM63XX_CPU_3368
#define irq_stat_reg0 PERF_IRQSTAT_3368_REG
@@ -324,8 +328,10 @@ void __dispatch_internal_##width(int cpu
u32 irq_stat_addr = get_irq_stat_addr(cpu); \
u32 irq_mask_addr = get_irq_mask_addr(cpu); \
int *next = &i[cpu]; \
+ unsigned long flags; \
\
/* read registers in reverse order */ \
+ spin_lock_irqsave(&ipic_lock, flags); \
for (src = 0, tgt = (width / 32); src < (width / 32); src++) { \
u32 val; \
\
@@ -336,6 +342,7 @@ void __dispatch_internal_##width(int cpu
if (val) \
irqs_pending = true; \
} \
+ spin_unlock_irqrestore(&ipic_lock, flags); \
\
if (!irqs_pending) \
return; \
@@ -357,10 +364,13 @@ static void __internal_irq_mask_##width(
unsigned reg = (irq / 32) ^ (width/32 - 1); \
unsigned bit = irq & 0x1f; \
u32 irq_mask_addr = get_irq_mask_addr(0); \
+ unsigned long flags; \
\
+ spin_lock_irqsave(&ipic_lock, flags); \
val = bcm_readl(irq_mask_addr + reg * sizeof(u32)); \
val &= ~(1 << bit); \
bcm_writel(val, irq_mask_addr + reg * sizeof(u32)); \
+ spin_unlock_irqrestore(&ipic_lock, flags); \
} \
\
static void __internal_irq_unmask_##width(unsigned int irq) \
@@ -369,10 +379,13 @@ static void __internal_irq_unmask_##widt
unsigned reg = (irq / 32) ^ (width/32 - 1); \
unsigned bit = irq & 0x1f; \
u32 irq_mask_addr = get_irq_mask_addr(0); \
+ unsigned long flags; \
\
+ spin_lock_irqsave(&ipic_lock, flags); \
val = bcm_readl(irq_mask_addr + reg * sizeof(u32)); \
val |= (1 << bit); \
bcm_writel(val, irq_mask_addr + reg * sizeof(u32)); \
+ spin_unlock_irqrestore(&ipic_lock, flags); \
}
BUILD_IPIC_INTERNAL(32);
@@ -431,8 +444,10 @@ static void bcm63xx_external_irq_mask(st
{
unsigned int irq = d->irq - IRQ_EXTERNAL_BASE;
u32 reg, regaddr;
+ unsigned long flags;
regaddr = get_ext_irq_perf_reg(irq);
+ spin_lock_irqsave(&epic_lock, flags);
reg = bcm_perf_readl(regaddr);
if (BCMCPU_IS_6348())
@@ -441,6 +456,8 @@ static void bcm63xx_external_irq_mask(st
reg &= ~EXTIRQ_CFG_MASK(irq % 4);
bcm_perf_writel(reg, regaddr);
+ spin_unlock_irqrestore(&epic_lock, flags);
+
if (is_ext_irq_cascaded)
internal_irq_mask(irq + ext_irq_start);
}
@@ -449,8 +466,10 @@ static void bcm63xx_external_irq_unmask(
{
unsigned int irq = d->irq - IRQ_EXTERNAL_BASE;
u32 reg, regaddr;
+ unsigned long flags;
regaddr = get_ext_irq_perf_reg(irq);
+ spin_lock_irqsave(&epic_lock, flags);
reg = bcm_perf_readl(regaddr);
if (BCMCPU_IS_6348())
@@ -459,6 +478,7 @@ static void bcm63xx_external_irq_unmask(
reg |= EXTIRQ_CFG_MASK(irq % 4);
bcm_perf_writel(reg, regaddr);
+ spin_unlock_irqrestore(&epic_lock, flags);
if (is_ext_irq_cascaded)
internal_irq_unmask(irq + ext_irq_start);
@@ -468,8 +488,10 @@ static void bcm63xx_external_irq_clear(s
{
unsigned int irq = d->irq - IRQ_EXTERNAL_BASE;
u32 reg, regaddr;
+ unsigned long flags;
regaddr = get_ext_irq_perf_reg(irq);
+ spin_lock_irqsave(&epic_lock, flags);
reg = bcm_perf_readl(regaddr);
if (BCMCPU_IS_6348())
@@ -478,6 +500,7 @@ static void bcm63xx_external_irq_clear(s
reg |= EXTIRQ_CFG_CLEAR(irq % 4);
bcm_perf_writel(reg, regaddr);
+ spin_unlock_irqrestore(&epic_lock, flags);
}
static int bcm63xx_external_irq_set_type(struct irq_data *d,
@@ -486,6 +509,7 @@ static int bcm63xx_external_irq_set_type
unsigned int irq = d->irq - IRQ_EXTERNAL_BASE;
u32 reg, regaddr;
int levelsense, sense, bothedge;
+ unsigned long flags;
flow_type &= IRQ_TYPE_SENSE_MASK;
@@ -520,6 +544,7 @@ static int bcm63xx_external_irq_set_type
}
regaddr = get_ext_irq_perf_reg(irq);
+ spin_lock_irqsave(&epic_lock, flags);
reg = bcm_perf_readl(regaddr);
irq %= 4;
@@ -564,6 +589,7 @@ static int bcm63xx_external_irq_set_type
}
bcm_perf_writel(reg, regaddr);
+ spin_unlock_irqrestore(&epic_lock, flags);
irqd_set_trigger_type(d, flow_type);
if (flow_type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))