From 3b0dba382bf5e3664a5e06de1092cca04cffcd59 Mon Sep 17 00:00:00 2001
From: Florian Fainelli <florian@openwrt.org>
Date: Wed, 20 Jun 2012 21:57:45 +0000
Subject: [PATCH] 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
---
.../mach-mcs814x/include/mach/entry-macro.S | 23 +++++++++++++++++++
.../files-3.3/arch/arm/mach-mcs814x/irq.c | 22 +-----------------
.../mcs814x/patches-3.3/001-platform.patch | 3 +--
3 files changed, 25 insertions(+), 23 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 9974dad293..eeff72ca64 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 cf86734afb..c8a3c18cfb 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 */ },
diff --git a/target/linux/mcs814x/patches-3.3/001-platform.patch b/target/linux/mcs814x/patches-3.3/001-platform.patch
index dc153a5d4e..fbe79af594 100644
--- a/target/linux/mcs814x/patches-3.3/001-platform.patch
+++ b/target/linux/mcs814x/patches-3.3/001-platform.patch
@@ -1,6 +1,6 @@
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
-@@ -869,6 +869,21 @@ config ARCH_EXYNOS
+@@ -869,6 +869,20 @@ config ARCH_EXYNOS
help
Support for SAMSUNG's EXYNOS SoCs (EXYNOS4/5)
@@ -15,7 +15,6 @@
+ select CLKDEV_LOOKUP
+ select ARCH_USES_GETTIMEOFFSET
+ select NEED_MACH_MEMORY_H
-+ select MULTI_IRQ_HANDLER
+ help
+ Support for Moschip MCS814x SoCs (MCS8140).
+
--
GitLab