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authorFlorian Fainelli <florian@openwrt.org>2012-06-20 21:57:45 +0000
committerFlorian Fainelli <florian@openwrt.org>2012-06-20 21:57:45 +0000
commit3b0dba382bf5e3664a5e06de1092cca04cffcd59 (patch)
tree02aa5315f0804c61a8f8c93bd361cb85957e5681 /target/linux/mcs814x/files-3.3
parentf45cd305435ab6fb16384b260d007413eac21231 (diff)
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do not use MULTI_IRQ_HANDLER it is bogus on our platform
This caused stalls in the Ethernet DMA block, so until properly written and sorted out, fallback to the assembly version instead. SVN-Revision: 32470
Diffstat (limited to 'target/linux/mcs814x/files-3.3')
-rw-r--r--target/linux/mcs814x/files-3.3/arch/arm/mach-mcs814x/include/mach/entry-macro.S23
-rw-r--r--target/linux/mcs814x/files-3.3/arch/arm/mach-mcs814x/irq.c22
2 files changed, 24 insertions, 21 deletions
diff --git a/target/linux/mcs814x/files-3.3/arch/arm/mach-mcs814x/include/mach/entry-macro.S b/target/linux/mcs814x/files-3.3/arch/arm/mach-mcs814x/include/mach/entry-macro.S
index 9974dad..eeff72c 100644
--- a/target/linux/mcs814x/files-3.3/arch/arm/mach-mcs814x/include/mach/entry-macro.S
+++ b/target/linux/mcs814x/files-3.3/arch/arm/mach-mcs814x/include/mach/entry-macro.S
@@ -4,3 +4,26 @@
.macro arch_ret_to_user, tmp1, tmp2
.endm
+
+ .macro get_irqnr_preamble, base, tmp
+ ldr \base, =mcs814x_intc_base @ base virtual address of AIC peripheral
+ ldr \base, [\base]
+ .endm
+
+ .macro get_irqnr_and_base, irqnr, irqstat, base, tmp
+ mov \tmp, #0x40
+ ldr \irqstat, [\base, \tmp]
+ tst \irqstat, \irqstat @ test if no active IRQ's
+ beq 1002f @ if no active irqs return with status 0
+ mov \irqnr, #0 @ start from irq zero
+ mov \tmp, #1 @ the mask initially 1
+1001:
+ tst \irqstat, \tmp @ and with mask
+ addeq \irqnr, \irqnr, #1 @ if zero then add one to nr
+ moveq \tmp, \tmp, lsl #1 @ shift mask one to left
+ beq 1001b @ if zero then loop again
+ mov \irqstat, \tmp @ save the return mask
+ mov \tmp, #0x00 @ ICR offset
+ str \irqstat, [\base, \tmp] @ clear irq with selected mask
+1002:
+ .endm
diff --git a/target/linux/mcs814x/files-3.3/arch/arm/mach-mcs814x/irq.c b/target/linux/mcs814x/files-3.3/arch/arm/mach-mcs814x/irq.c
index cf86734..c8a3c18 100644
--- a/target/linux/mcs814x/files-3.3/arch/arm/mach-mcs814x/irq.c
+++ b/target/linux/mcs814x/files-3.3/arch/arm/mach-mcs814x/irq.c
@@ -20,7 +20,7 @@
#define MCS814X_IRQ_MASK 0x20
#define MCS814X_IRQ_STS0 0x40
-static void __iomem *mcs814x_intc_base;
+void __iomem *mcs814x_intc_base;
static void __init mcs814x_alloc_gc(void __iomem *base, unsigned int irq_start,
unsigned int num)
@@ -47,26 +47,6 @@ static void __init mcs814x_alloc_gc(void __iomem *base, unsigned int irq_start,
__raw_writel(0xffffffff, base + MCS814X_IRQ_ICR);
}
-asmlinkage void __exception_irq_entry mcs814x_handle_irq(struct pt_regs *regs)
-{
- u32 status, irq;
-
- do {
- /* read the status register */
- status = __raw_readl(mcs814x_intc_base + MCS814X_IRQ_STS0);
- if (!status)
- break;
-
- irq = ffs(status) - 1;
- status |= (1 << irq);
- /* clear the interrupt */
- __raw_writel(status, mcs814x_intc_base + MCS814X_IRQ_ICR);
- /* call the generic handler */
- handle_IRQ(irq, regs);
-
- } while (1);
-}
-
static const struct of_device_id mcs814x_intc_ids[] = {
{ .compatible = "moschip,mcs814x-intc" },
{ /* sentinel */ },