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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>
This commit is contained in:
Darius Augulis 2008-09-09 11:29:41 +02:00 committed by Sascha Hauer
parent d7568f79d5
commit 479c901f59
4 changed files with 48 additions and 11 deletions
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11
arch/arm/plat-mxc/Kconfig
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@ -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

12
arch/arm/plat-mxc/include/mach/entry-macro.S
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@ -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)

1
arch/arm/plat-mxc/include/mach/irqs.h
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@ -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__ */

35
arch/arm/plat-mxc/irq.c
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@ -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();