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MN10300: Make various interrupt priority settings configurable 

Make the settings of interrupt priorities used by various services configurable
at run time.

Signed-off-by: Akira Takeuchi <takeuchi.akr@jp.panasonic.com>
Signed-off-by: Kiyoshi Owada <owada.kiyoshi@jp.panasonic.com>
Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
Akira Takeuchi 2010-10-27 17:28:54 +01:00 committed by David Howells
parent ab244c1a08
commit 37e4ec9636
2 changed files with 76 additions and 6 deletions
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74
arch/mn10300/Kconfig
View File

@ -351,6 +351,80 @@ config MN10300_TTYSM2_CTS
endmenu
menu "Interrupt request priority options"
comment "[!] NOTE: A lower number/level indicates a higher priority (0 is highest, 6 is lowest)"
comment "____Non-maskable interrupt levels____"
comment "The following must be set to a higher priority than local_irq_disable() and on-chip serial"
config GDBSTUB_IRQ_LEVEL
int "GDBSTUB interrupt priority"
depends on GDBSTUB
range 0 1 if LINUX_CLI_LEVEL = 2
range 0 2 if LINUX_CLI_LEVEL = 3
range 0 3 if LINUX_CLI_LEVEL = 4
range 0 4 if LINUX_CLI_LEVEL = 5
range 0 5 if LINUX_CLI_LEVEL = 6
default 0
comment "The following must be set to a higher priority than local_irq_disable()"
config MN10300_SERIAL_IRQ_LEVEL
int "MN10300 on-chip serial interrupt priority"
depends on MN10300_TTYSM
range 1 1 if LINUX_CLI_LEVEL = 2
range 1 2 if LINUX_CLI_LEVEL = 3
range 1 3 if LINUX_CLI_LEVEL = 4
range 1 4 if LINUX_CLI_LEVEL = 5
range 1 5 if LINUX_CLI_LEVEL = 6
default 1
comment "-"
comment "____Maskable interrupt levels____"
config LINUX_CLI_LEVEL
int "The highest interrupt priority excluded by local_irq_disable() (2-6)"
range 2 6
default 2
help
local_irq_disable() doesn't actually disable maskable interrupts -
what it does is restrict the levels of interrupt which are permitted
(a lower level indicates a higher priority) by lowering the value in
EPSW.IM from 7. Any interrupt is permitted for which the level is
lower than EPSW.IM.
Certain interrupts, such as GDBSTUB and virtual MN10300 on-chip
serial DMA interrupts are allowed to interrupt normal disabled
sections.
comment "The following must be set to a equal to or lower priority than LINUX_CLI_LEVEL"
config TIMER_IRQ_LEVEL
int "Kernel timer interrupt priority"
range LINUX_CLI_LEVEL 6
default 4
config PCI_IRQ_LEVEL
int "PCI interrupt priority"
depends on PCI
range LINUX_CLI_LEVEL 6
default 5
config ETHERNET_IRQ_LEVEL
int "Ethernet interrupt priority"
depends on SMC91X || SMC911X || SMSC911X
range LINUX_CLI_LEVEL 6
default 6
config EXT_SERIAL_IRQ_LEVEL
int "External serial port interrupt priority"
depends on SERIAL_8250
range LINUX_CLI_LEVEL 6
default 6
endmenu
source "mm/Kconfig"
menu "Power management options"

8
arch/mn10300/include/asm/irqflags.h
View File

@ -23,11 +23,7 @@
* - level 6 - timer interrupt
* - "enabled": run in IM7
*/
#ifdef CONFIG_MN10300_TTYSM
#define MN10300_CLI_LEVEL EPSW_IM_2
#else
#define MN10300_CLI_LEVEL EPSW_IM_1
#endif
#define MN10300_CLI_LEVEL (CONFIG_LINUX_CLI_LEVEL << EPSW_IM_SHIFT)
#ifndef __ASSEMBLY__
@ -94,7 +90,7 @@ static inline void arch_local_irq_restore(unsigned long flags)
static inline bool arch_irqs_disabled_flags(unsigned long flags)
{
return (flags & EPSW_IM) <= MN10300_CLI_LEVEL;
return (flags & (EPSW_IE | EPSW_IM)) != (EPSW_IE | EPSW_IM_7);
}
static inline bool arch_irqs_disabled(void)