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MIPS: BCM63xx: Protect irq register accesses 

Since we will have the chance of accessing the registers concurrently,
protect any accesses through a spinlock.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>
Cc: linux-mips@linux-mips.org
Cc: John Crispin <blogic@openwrt.org>
Cc: Maxime Bizon <mbizon@freebox.fr>
Cc: Florian Fainelli <florian@openwrt.org>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Gregory Fong <gregory.0xf0@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/7321/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Jonas Gorski 2014-07-12 12:49:39 +02:00 committed by Ralf Baechle
parent 7a9fd14d4c
commit 74b8ca3f31
1 changed files with 26 additions and 0 deletions
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26
arch/mips/bcm63xx/irq.c
View File

@ -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>
@ -20,6 +21,9 @@
#include <bcm63xx_irq.h>
static DEFINE_SPINLOCK(ipic_lock);
static DEFINE_SPINLOCK(epic_lock);
static u32 irq_stat_addr[2];
static u32 irq_mask_addr[2];
static void (*dispatch_internal)(int cpu);
@ -62,8 +66,10 @@ void __dispatch_internal_##width(int cpu) \
bool irqs_pending = false; \
static unsigned int i[2]; \
unsigned 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; \
\
@ -74,6 +80,7 @@ void __dispatch_internal_##width(int cpu) \
if (val) \
irqs_pending = true; \
} \
spin_unlock_irqrestore(&ipic_lock, flags); \
\
if (!irqs_pending) \
return; \
@ -94,10 +101,13 @@ static void __internal_irq_mask_##width(unsigned int irq) \
u32 val; \
unsigned reg = (irq / 32) ^ (width/32 - 1); \
unsigned bit = irq & 0x1f; \
unsigned long flags; \
\
spin_lock_irqsave(&ipic_lock, flags); \
val = bcm_readl(irq_mask_addr[0] + reg * sizeof(u32)); \
val &= ~(1 << bit); \
bcm_writel(val, irq_mask_addr[0] + reg * sizeof(u32)); \
spin_unlock_irqrestore(&ipic_lock, flags); \
} \
\
static void __internal_irq_unmask_##width(unsigned int irq) \
@ -105,10 +115,13 @@ static void __internal_irq_unmask_##width(unsigned int irq) \
u32 val; \
unsigned reg = (irq / 32) ^ (width/32 - 1); \
unsigned bit = irq & 0x1f; \
unsigned long flags; \
\
spin_lock_irqsave(&ipic_lock, flags); \
val = bcm_readl(irq_mask_addr[0] + reg * sizeof(u32)); \
val |= (1 << bit); \
bcm_writel(val, irq_mask_addr[0] + reg * sizeof(u32)); \
spin_unlock_irqrestore(&ipic_lock, flags); \
}
BUILD_IPIC_INTERNAL(32);
@ -167,8 +180,10 @@ static void bcm63xx_external_irq_mask(struct irq_data *d)
{
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())
@ -177,6 +192,8 @@ static void bcm63xx_external_irq_mask(struct irq_data *d)
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);
}
@ -185,8 +202,10 @@ static void bcm63xx_external_irq_unmask(struct irq_data *d)
{
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())
@ -195,6 +214,7 @@ static void bcm63xx_external_irq_unmask(struct irq_data *d)
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);
@ -204,8 +224,10 @@ static void bcm63xx_external_irq_clear(struct irq_data *d)
{
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())
@ -214,6 +236,7 @@ static void bcm63xx_external_irq_clear(struct irq_data *d)
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,
@ -222,6 +245,7 @@ static int bcm63xx_external_irq_set_type(struct irq_data *d,
unsigned int irq = d->irq - IRQ_EXTERNAL_BASE;
u32 reg, regaddr;
int levelsense, sense, bothedge;
unsigned long flags;
flow_type &= IRQ_TYPE_SENSE_MASK;
@ -256,6 +280,7 @@ static int bcm63xx_external_irq_set_type(struct irq_data *d,
}
regaddr = get_ext_irq_perf_reg(irq);
spin_lock_irqsave(&epic_lock, flags);
reg = bcm_perf_readl(regaddr);
irq %= 4;
@ -300,6 +325,7 @@ static int bcm63xx_external_irq_set_type(struct irq_data *d,
}
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))