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m68k: Mac IRQ cleanup 

There are no slow IRQs on Macs since Roman Zippel's IRQ reorganisation that
went into 2.6.16 and removed mac_irq_list[] and the do_mac_irq_list()
dispatcher. (They were implemented in do_mac_irq_list() by lowering the IPL.)
Hence there's no more use for mutual exclusion in the Mac interrupt
dispatchers. Remove it.

Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Finn Thain 2007-05-01 22:32:58 +02:00 committed by Linus Torvalds
parent cd713ddc93
commit 217f6710c2
4 changed files with 7 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
arch/m68k/mac/baboon.c
View File

@ -22,7 +22,7 @@
/* #define DEBUG_BABOON */
/* #define DEBUG_IRQS */
int baboon_present,baboon_active;
int baboon_present;
volatile struct baboon *baboon;
irqreturn_t baboon_irq(int, void *);
@ -45,7 +45,6 @@ void __init baboon_init(void)
baboon = (struct baboon *) BABOON_BASE;
baboon_present = 1;
baboon_active = 0;
printk("Baboon detected at %p\n", baboon);
}
@ -70,9 +69,9 @@ irqreturn_t baboon_irq(int irq, void *dev_id)
unsigned char events;
#ifdef DEBUG_IRQS
printk("baboon_irq: mb_control %02X mb_ifr %02X mb_status %02X active %02X\n",
printk("baboon_irq: mb_control %02X mb_ifr %02X mb_status %02X\n",
(uint) baboon->mb_control, (uint) baboon->mb_ifr,
(uint) baboon->mb_status, baboon_active);
(uint) baboon->mb_status);
#endif
if (!(events = baboon->mb_ifr & 0x07))
@ -81,11 +80,9 @@ irqreturn_t baboon_irq(int irq, void *dev_id)
irq_num = IRQ_BABOON_0;
irq_bit = 1;
do {
if (events & irq_bit/* & baboon_active*/) {
baboon_active &= ~irq_bit;
if (events & irq_bit) {
baboon->mb_ifr &= ~irq_bit;
m68k_handle_int(irq_num);
baboon_active |= irq_bit;
}
irq_bit <<= 1;
irq_num++;
@ -99,21 +96,18 @@ irqreturn_t baboon_irq(int irq, void *dev_id)
}
void baboon_irq_enable(int irq) {
int irq_idx = IRQ_IDX(irq);
#ifdef DEBUG_IRQUSE
printk("baboon_irq_enable(%d)\n", irq);
#endif
baboon_active |= (1 << irq_idx);
/* FIXME: figure out how to mask and unmask baboon interrupt sources */
enable_irq(IRQ_NUBUS_C);
}
void baboon_irq_disable(int irq) {
int irq_idx = IRQ_IDX(irq);
#ifdef DEBUG_IRQUSE
printk("baboon_irq_disable(%d)\n", irq);
#endif
baboon_active &= ~(1 << irq_idx);
disable_irq(IRQ_NUBUS_C);
}
void baboon_irq_clear(int irq) {

4
arch/m68k/mac/oss.c
View File

@ -112,10 +112,8 @@ irqreturn_t oss_irq(int irq, void *dev_id)
oss->irq_pending &= ~OSS_IP_SOUND;
/* FIXME: call sound handler */
} else if (events & OSS_IP_SCSI) {
oss->irq_level[OSS_SCSI] = OSS_IRQLEV_DISABLED;
oss->irq_pending &= ~OSS_IP_SCSI;
m68k_handle_int(IRQ_MAC_SCSI);
oss->irq_level[OSS_SCSI] = OSS_IRQLEV_SCSI;
} else {
/* FIXME: error check here? */
}
@ -149,10 +147,8 @@ irqreturn_t oss_nubus_irq(int irq, void *dev_id)
--i;
irq_bit >>= 1;
if (events & irq_bit) {
oss->irq_level[i] = OSS_IRQLEV_DISABLED;
oss->irq_pending &= ~irq_bit;
m68k_handle_int(NUBUS_SOURCE_BASE + i);
oss->irq_level[i] = OSS_IRQLEV_NUBUS;
}
} while(events & (irq_bit - 1));
return IRQ_HANDLED;

2
arch/m68k/mac/psc.c
View File

@ -147,10 +147,8 @@ irqreturn_t psc_irq(int irq, void *dev_id)
irq_bit = 1;
do {
if (events & irq_bit) {
psc_write_byte(pIER, irq_bit);
psc_write_byte(pIFR, irq_bit);
m68k_handle_int(irq_num);
psc_write_byte(pIER, irq_bit | 0x80);
}
irq_num++;
irq_bit <<= 1;

10
arch/m68k/mac/via.c
View File

@ -443,11 +443,6 @@ void __init via_nubus_init(void)
/*
* The generic VIA interrupt routines (shamelessly stolen from Alan Cox's
* via6522.c :-), disable/pending masks added.
*
* The new interrupt architecture in macints.c takes care of a lot of the
* gruntwork for us, including tallying the interrupts and calling the
* handlers on the linked list. All we need to do here is basically generate
* the machspec interrupt number after clearing the interrupt.
*/
irqreturn_t via1_irq(int irq, void *dev_id)
@ -463,10 +458,8 @@ irqreturn_t via1_irq(int irq, void *dev_id)
irq_bit = 1;
do {
if (events & irq_bit) {
via1[vIER] = irq_bit;
via1[vIFR] = irq_bit;
m68k_handle_int(irq_num);
via1[vIER] = irq_bit | 0x80;
}
++irq_num;
irq_bit <<= 1;
@ -502,11 +495,8 @@ irqreturn_t via2_irq(int irq, void *dev_id)
irq_bit = 1;
do {
if (events & irq_bit) {
via2[gIER] = irq_bit;
via2[gIFR] = irq_bit | rbv_clear;
m68k_handle_int(irq_num);
if (irq_num != IRQ_MAC_NUBUS || nubus_disabled == 0)
via2[gIER] = irq_bit | 0x80;
}
++irq_num;
irq_bit <<= 1;