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authorDarius Augulis <augulis.darius@gmail.com>2008-09-09 11:29:41 +0200
committerSascha Hauer <s.hauer@pengutronix.de>2008-09-09 12:13:50 +0200
commit479c901f59762732dee305166ae477171cae3617 (patch)
treeb061499771021b431d54ec46fe66b3b31be4a37f
parentd7568f79d5c289d0d7859680be7b5afdcea0c9b2 (diff)
MXC: Lets handle IRQ by priority, defined with exported API function
Signed-off-by: Darius Augulis <augulis.darius@gmail.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
-rw-r--r--arch/arm/plat-mxc/Kconfig11
-rw-r--r--arch/arm/plat-mxc/include/mach/entry-macro.S12
-rw-r--r--arch/arm/plat-mxc/include/mach/irqs.h1
-rw-r--r--arch/arm/plat-mxc/irq.c35
4 files changed, 48 insertions, 11 deletions
diff --git a/arch/arm/plat-mxc/Kconfig b/arch/arm/plat-mxc/Kconfig
index e14eaad11dd..b2a7e3fad11 100644
--- a/arch/arm/plat-mxc/Kconfig
+++ b/arch/arm/plat-mxc/Kconfig
@@ -23,4 +23,15 @@ source "arch/arm/mach-mx3/Kconfig"
endmenu
+config MXC_IRQ_PRIOR
+ bool "Use IRQ priority"
+ depends on ARCH_MXC
+ help
+ Select this if you want to use prioritized IRQ handling.
+ This feature prevents higher priority ISR to be interrupted
+ by lower priority IRQ even IRQF_DISABLED flag is not set.
+ This may be useful in embedded applications, where are strong
+ requirements for timing.
+ Say N here, unless you have a specialized requirement.
+
endif
diff --git a/arch/arm/plat-mxc/include/mach/entry-macro.S b/arch/arm/plat-mxc/include/mach/entry-macro.S
index b542433afb1..11632028f7d 100644
--- a/arch/arm/plat-mxc/include/mach/entry-macro.S
+++ b/arch/arm/plat-mxc/include/mach/entry-macro.S
@@ -9,11 +9,17 @@
* published by the Free Software Foundation.
*/
+#define AVIC_NIMASK 0x04
+
@ this macro disables fast irq (not implemented)
.macro disable_fiq
.endm
.macro get_irqnr_preamble, base, tmp
+ ldr \base, =AVIC_IO_ADDRESS(AVIC_BASE_ADDR)
+#ifdef CONFIG_MXC_IRQ_PRIOR
+ ldr r4, [\base, #AVIC_NIMASK]
+#endif
.endm
.macro arch_ret_to_user, tmp1, tmp2
@@ -23,7 +29,6 @@
@ and returns its number in irqnr
@ and returns if an interrupt occured in irqstat
.macro get_irqnr_and_base, irqnr, irqstat, base, tmp
- ldr \base, =AVIC_IO_ADDRESS(AVIC_BASE_ADDR)
@ Load offset & priority of the highest priority
@ interrupt pending from AVIC_NIVECSR
ldr \irqstat, [\base, #0x40]
@@ -32,6 +37,11 @@
mov \irqnr, \irqstat, asr #16
@ set zero flag if IRQ + 1 == 0
adds \tmp, \irqnr, #1
+#ifdef CONFIG_MXC_IRQ_PRIOR
+ bicne \tmp, \irqstat, #0xFFFFFFE0
+ strne \tmp, [\base, #AVIC_NIMASK]
+ streq r4, [\base, #AVIC_NIMASK]
+#endif
.endm
@ irq priority table (not used)
diff --git a/arch/arm/plat-mxc/include/mach/irqs.h b/arch/arm/plat-mxc/include/mach/irqs.h
index 228c4f68ccd..b55bba35e18 100644
--- a/arch/arm/plat-mxc/include/mach/irqs.h
+++ b/arch/arm/plat-mxc/include/mach/irqs.h
@@ -12,5 +12,6 @@
#define __ASM_ARCH_MXC_IRQS_H__
#include <mach/hardware.h>
+extern void imx_irq_set_priority(unsigned char irq, unsigned char prio);
#endif /* __ASM_ARCH_MXC_IRQS_H__ */
diff --git a/arch/arm/plat-mxc/irq.c b/arch/arm/plat-mxc/irq.c
index 1053b666c67..a41abf0bdd6 100644
--- a/arch/arm/plat-mxc/irq.c
+++ b/arch/arm/plat-mxc/irq.c
@@ -30,14 +30,7 @@
#define AVIC_INTENABLEL (AVIC_BASE + 0x14) /* int enable reg low */
#define AVIC_INTTYPEH (AVIC_BASE + 0x18) /* int type reg high */
#define AVIC_INTTYPEL (AVIC_BASE + 0x1C) /* int type reg low */
-#define AVIC_NIPRIORITY7 (AVIC_BASE + 0x20) /* norm int priority lvl7 */
-#define AVIC_NIPRIORITY6 (AVIC_BASE + 0x24) /* norm int priority lvl6 */
-#define AVIC_NIPRIORITY5 (AVIC_BASE + 0x28) /* norm int priority lvl5 */
-#define AVIC_NIPRIORITY4 (AVIC_BASE + 0x2C) /* norm int priority lvl4 */
-#define AVIC_NIPRIORITY3 (AVIC_BASE + 0x30) /* norm int priority lvl3 */
-#define AVIC_NIPRIORITY2 (AVIC_BASE + 0x34) /* norm int priority lvl2 */
-#define AVIC_NIPRIORITY1 (AVIC_BASE + 0x38) /* norm int priority lvl1 */
-#define AVIC_NIPRIORITY0 (AVIC_BASE + 0x3C) /* norm int priority lvl0 */
+#define AVIC_NIPRIORITY(x) (AVIC_BASE + (0x20 + 4 * (7 - (x)))) /* int priority */
#define AVIC_NIVECSR (AVIC_BASE + 0x40) /* norm int vector/status */
#define AVIC_FIVECSR (AVIC_BASE + 0x44) /* fast int vector/status */
#define AVIC_INTSRCH (AVIC_BASE + 0x48) /* int source reg high */
@@ -54,6 +47,24 @@
#define IIM_PROD_REV_SH 3
#define IIM_PROD_REV_LEN 5
+#ifdef CONFIG_MXC_IRQ_PRIOR
+void imx_irq_set_priority(unsigned char irq, unsigned char prio)
+{
+ unsigned int temp;
+ unsigned int mask = 0x0F << irq % 8 * 4;
+
+ if (irq > 63)
+ return;
+
+ temp = __raw_readl(AVIC_NIPRIORITY(irq / 8));
+ temp &= ~mask;
+ temp |= prio & mask;
+
+ __raw_writel(temp, AVIC_NIPRIORITY(irq / 8));
+}
+EXPORT_SYMBOL(imx_irq_set_priority);
+#endif
+
/* Disable interrupt number "irq" in the AVIC */
static void mxc_mask_irq(unsigned int irq)
{
@@ -101,10 +112,14 @@ void __init mxc_init_irq(void)
set_irq_flags(i, IRQF_VALID);
}
+ /* Set default priority value (0) for all IRQ's */
+ for (i = 0; i < 8; i++)
+ __raw_writel(0, AVIC_NIPRIORITY(i));
+
/* Set WDOG2's interrupt the highest priority level (bit 28-31) */
- reg = __raw_readl(AVIC_NIPRIORITY6);
+ reg = __raw_readl(AVIC_NIPRIORITY(6));
reg |= (0xF << 28);
- __raw_writel(reg, AVIC_NIPRIORITY6);
+ __raw_writel(reg, AVIC_NIPRIORITY(6));
/* init architectures chained interrupt handler */
mxc_register_gpios();