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m68k: Mac IRQ prep
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Make sure that there are no slot IRQs asserted before leaving the nubus
handler. If there are and we don't then the nubus gets wedged because this
prevents a CA1 transition, which means no more nubus IRQs.

Make the interrupt dispatch loops terminate sooner.

Explicitly initialise the VIA latches to make the code more easily understood.

Also some cleanups.

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>
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Finn Thain authored and Linus Torvalds committed May 5, 2007
1 parent 647b804 commit 67dfb15
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Showing 4 changed files with 111 additions and 69 deletions.
12 changes: 8 additions & 4 deletions arch/m68k/mac/baboon.c
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Original file line number Diff line number Diff line change
Expand Up @@ -66,7 +66,7 @@ void __init baboon_register_interrupts(void)

irqreturn_t baboon_irq(int irq, void *dev_id)
{
int irq_bit,i;
int irq_bit, irq_num;
unsigned char events;

#ifdef DEBUG_IRQS
Expand All @@ -78,14 +78,18 @@ irqreturn_t baboon_irq(int irq, void *dev_id)
if (!(events = baboon->mb_ifr & 0x07))
return IRQ_NONE;

for (i = 0, irq_bit = 1 ; i < 3 ; i++, irq_bit <<= 1) {
irq_num = IRQ_BABOON_0;
irq_bit = 1;
do {
if (events & irq_bit/* & baboon_active*/) {
baboon_active &= ~irq_bit;
baboon->mb_ifr &= ~irq_bit;
m68k_handle_int(IRQ_BABOON_0 + i);
m68k_handle_int(irq_num);
baboon_active |= irq_bit;
}
}
irq_bit <<= 1;
irq_num++;
} while(events >= irq_bit);
#if 0
if (baboon->mb_ifr & 0x02) macide_ack_intr(NULL);
/* for now we need to smash all interrupts */
Expand Down
8 changes: 6 additions & 2 deletions arch/m68k/mac/oss.c
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Original file line number Diff line number Diff line change
Expand Up @@ -143,14 +143,18 @@ irqreturn_t oss_nubus_irq(int irq, void *dev_id)
#endif
/* There are only six slots on the OSS, not seven */

for (i = 0, irq_bit = 1 ; i < 6 ; i++, irq_bit <<= 1) {
i = 6;
irq_bit = 0x40;
do {
--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;
}

Expand Down
19 changes: 10 additions & 9 deletions arch/m68k/mac/psc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -131,11 +131,8 @@ irqreturn_t psc_irq(int irq, void *dev_id)
{
int pIFR = pIFRbase + ((int) dev_id);
int pIER = pIERbase + ((int) dev_id);
int base_irq;
int irq_bit,i;
unsigned char events;

base_irq = irq << 3;
int irq_num;
unsigned char irq_bit, events;

#ifdef DEBUG_IRQS
printk("psc_irq: irq %d pIFR = 0x%02X pIER = 0x%02X\n",
Expand All @@ -146,14 +143,18 @@ irqreturn_t psc_irq(int irq, void *dev_id)
if (!events)
return IRQ_NONE;

for (i = 0, irq_bit = 1 ; i < 4 ; i++, irq_bit <<= 1) {
if (events & irq_bit) {
irq_num = irq << 3;
irq_bit = 1;
do {
if (events & irq_bit) {
psc_write_byte(pIER, irq_bit);
psc_write_byte(pIFR, irq_bit);
m68k_handle_int(base_irq + i);
m68k_handle_int(irq_num);
psc_write_byte(pIER, irq_bit | 0x80);
}
}
irq_num++;
irq_bit <<= 1;
} while (events >= irq_bit);
return IRQ_HANDLED;
}

Expand Down
141 changes: 87 additions & 54 deletions arch/m68k/mac/via.c
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,10 @@
* for info. A full-text web search on 6522 AND VIA will probably also
* net some usefulness. <cananian@alumni.princeton.edu> 20apr1999
*
* Additional data is here (the SY6522 was used in the Mac II etc):
* http://www.6502.org/documents/datasheets/synertek/synertek_sy6522.pdf
* http://www.6502.org/documents/datasheets/synertek/synertek_sy6522_programming_reference.pdf
*
* PRAM/RTC access algorithms are from the NetBSD RTC toolkit version 1.08b
* by Erik Vogan and adapted to Linux by Joshua M. Thompson (funaho@jurai.org)
*
Expand All @@ -37,7 +41,7 @@ volatile __u8 *via1, *via2;
/* See note in mac_via.h about how this is possibly not useful */
volatile long *via_memory_bogon=(long *)&via_memory_bogon;
#endif
int rbv_present,via_alt_mapping;
int rbv_present, via_alt_mapping;
__u8 rbv_clear;

/*
Expand Down Expand Up @@ -138,11 +142,11 @@ void __init via_init(void)

printk(KERN_INFO "VIA2 at %p is ", via2);
if (rbv_present) {
printk(KERN_INFO "an RBV\n");
printk("an RBV\n");
} else if (oss_present) {
printk(KERN_INFO "an OSS\n");
printk("an OSS\n");
} else {
printk(KERN_INFO "a 6522 or clone\n");
printk("a 6522 or clone\n");
}

#ifdef DEBUG_VIA
Expand All @@ -163,6 +167,7 @@ void __init via_init(void)
via1[vT2CL] = 0;
via1[vT2CH] = 0;
via1[vACR] &= 0x3F;
via1[vACR] &= ~0x03; /* disable port A & B latches */

/*
* SE/30: disable video IRQ
Expand Down Expand Up @@ -234,6 +239,22 @@ void __init via_init(void)
via2[vT2CL] = 0;
via2[vT2CH] = 0;
via2[vACR] &= 0x3F;
via2[vACR] &= ~0x03; /* disable port A & B latches */
}

/*
* Set vPCR for SCSI interrupts (but not on RBV)
*/
if (!rbv_present) {
if (macintosh_config->scsi_type == MAC_SCSI_OLD) {
/* CB2 (IRQ) indep. input, positive edge */
/* CA2 (DRQ) indep. input, positive edge */
via2[vPCR] = 0x66;
} else {
/* CB2 (IRQ) indep. input, negative edge */
/* CA2 (DRQ) indep. input, negative edge */
via2[vPCR] = 0x22;
}
}
}

Expand Down Expand Up @@ -367,19 +388,14 @@ void __init via_nubus_init(void)

/* unlock nubus transactions */

if (!rbv_present) {
if ((macintosh_config->adb_type != MAC_ADB_PB1) &&
(macintosh_config->adb_type != MAC_ADB_PB2)) {
/* set the line to be an output on non-RBV machines */
if ((macintosh_config->adb_type != MAC_ADB_PB1) &&
(macintosh_config->adb_type != MAC_ADB_PB2)) {
if (!rbv_present)
via2[vDirB] |= 0x02;
}
}

/* this seems to be an ADB bit on PMU machines */
/* according to MkLinux. -- jmt */

if ((macintosh_config->adb_type != MAC_ADB_PB1) &&
(macintosh_config->adb_type != MAC_ADB_PB2)) {
/* this seems to be an ADB bit on PMU machines */
/* according to MkLinux. -- jmt */
via2[gBufB] |= 0x02;
}

Expand Down Expand Up @@ -420,20 +436,25 @@ void __init via_nubus_init(void)

irqreturn_t via1_irq(int irq, void *dev_id)
{
int irq_bit, i;
unsigned char events, mask;
int irq_num;
unsigned char irq_bit, events;

mask = via1[vIER] & 0x7F;
if (!(events = via1[vIFR] & mask))
events = via1[vIFR] & via1[vIER] & 0x7F;
if (!events)
return IRQ_NONE;

for (i = 0, irq_bit = 1 ; i < 7 ; i++, irq_bit <<= 1)
irq_num = VIA1_SOURCE_BASE;
irq_bit = 1;
do {
if (events & irq_bit) {
via1[vIER] = irq_bit;
via1[vIFR] = irq_bit;
m68k_handle_int(VIA1_SOURCE_BASE + i);
m68k_handle_int(irq_num);
via1[vIER] = irq_bit | 0x80;
}
++irq_num;
irq_bit <<= 1;
} while (events >= irq_bit);

#if 0 /* freakin' pmu is doing weird stuff */
if (!oss_present) {
Expand All @@ -454,20 +475,25 @@ irqreturn_t via1_irq(int irq, void *dev_id)

irqreturn_t via2_irq(int irq, void *dev_id)
{
int irq_bit, i;
unsigned char events, mask;
int irq_num;
unsigned char irq_bit, events;

mask = via2[gIER] & 0x7F;
if (!(events = via2[gIFR] & mask))
events = via2[gIFR] & via2[gIER] & 0x7F;
if (!events)
return IRQ_NONE;

for (i = 0, irq_bit = 1 ; i < 7 ; i++, irq_bit <<= 1)
irq_num = VIA2_SOURCE_BASE;
irq_bit = 1;
do {
if (events & irq_bit) {
via2[gIER] = irq_bit;
via2[gIFR] = irq_bit | rbv_clear;
m68k_handle_int(VIA2_SOURCE_BASE + i);
m68k_handle_int(irq_num);
via2[gIER] = irq_bit | 0x80;
}
++irq_num;
irq_bit <<= 1;
} while (events >= irq_bit);
return IRQ_HANDLED;
}

Expand All @@ -478,19 +504,37 @@ irqreturn_t via2_irq(int irq, void *dev_id)

irqreturn_t via_nubus_irq(int irq, void *dev_id)
{
int irq_bit, i;
unsigned char events;

if (!(events = ~via2[gBufA] & nubus_active))
int slot_irq;
unsigned char slot_bit, events;

events = ~via2[gBufA] & 0x7F;
if (rbv_present)
events &= via2[rSIER];
else
events &= nubus_active;
if (!events)
return IRQ_NONE;

for (i = 0, irq_bit = 1 ; i < 7 ; i++, irq_bit <<= 1) {
if (events & irq_bit) {
via_irq_disable(NUBUS_SOURCE_BASE + i);
m68k_handle_int(NUBUS_SOURCE_BASE + i);
via_irq_enable(NUBUS_SOURCE_BASE + i);
}
}
do {
slot_irq = IRQ_NUBUS_F;
slot_bit = 0x40;
do {
if (events & slot_bit) {
events &= ~slot_bit;
m68k_handle_int(slot_irq);
}
--slot_irq;
slot_bit >>= 1;
} while (events);

/* clear the CA1 interrupt and make certain there's no more. */
via2[gIFR] = 0x02 | rbv_clear;
events = ~via2[gBufA] & 0x7F;
if (rbv_present)
events &= via2[rSIER];
else
events &= nubus_active;
} while (events);
return IRQ_HANDLED;
}

Expand All @@ -506,20 +550,6 @@ void via_irq_enable(int irq) {
if (irq_src == 1) {
via1[vIER] = irq_bit | 0x80;
} else if (irq_src == 2) {
/*
* Set vPCR for SCSI interrupts (but not on RBV)
*/
if ((irq_idx == 0) && !rbv_present) {
if (macintosh_config->scsi_type == MAC_SCSI_OLD) {
/* CB2 (IRQ) indep. input, positive edge */
/* CA2 (DRQ) indep. input, positive edge */
via2[vPCR] = 0x66;
} else {
/* CB2 (IRQ) indep. input, negative edge */
/* CA2 (DRQ) indep. input, negative edge */
via2[vPCR] = 0x22;
}
}
via2[gIER] = irq_bit | 0x80;
} else if (irq_src == 7) {
nubus_active |= irq_bit;
Expand Down Expand Up @@ -557,9 +587,9 @@ void via_irq_disable(int irq) {
#endif

if (irq_src == 1) {
via1[vIER] = irq_bit;
via1[vIER] = irq_bit & 0x7F;
} else if (irq_src == 2) {
via2[gIER] = irq_bit;
via2[gIER] = irq_bit & 0x7F;
} else if (irq_src == 7) {
if (rbv_present) {
/* disable the slot interrupt. SIER works like IER. */
Expand All @@ -586,7 +616,9 @@ void via_irq_clear(int irq) {
} else if (irq_src == 2) {
via2[gIFR] = irq_bit | rbv_clear;
} else if (irq_src == 7) {
/* FIXME: hmm.. */
/* FIXME: There is no way to clear an individual nubus slot
* IRQ flag, other than getting the device to do it.
*/
}
}

Expand All @@ -606,6 +638,7 @@ int via_irq_pending(int irq)
} else if (irq_src == 2) {
return via2[gIFR] & irq_bit;
} else if (irq_src == 7) {
/* FIXME: this can't work while a slot irq is disabled! */
return ~via2[gBufA] & irq_bit;
}
return 0;
Expand Down

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