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m68k/mac: oss irq fixes
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The IOP driver calls into the OSS driver to enable its IRQ. This undesirable coupling between drivers only exists because the OSS driver doesn't correctly handle all of its machspec IRQs.

Fix OSS handling of enable/disable for VIA1 IRQs (8 thru 15) which includes MAC_IRQ_ADB.

Back when I implemented pmac_zilog support I redefined IRQ_MAC_SCC incorrectly. Change this to a machspec IRQ so that it works on OSS.

Clean up the unused OSS audio IRQ and OSS_IRQLEV_* cruft that only confuses things.

Fix the OSS description in macints.c and remove an obsolete comment.

Don't enable the VIA1 irq before registering the handler.

Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
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Finn Thain authored and Geert Uytterhoeven committed Dec 10, 2011
1 parent c4af5da commit da3fb3c
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Showing 6 changed files with 76 additions and 109 deletions.
19 changes: 0 additions & 19 deletions arch/m68k/include/asm/mac_oss.h
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Original file line number Diff line number Diff line change
Expand Up @@ -58,25 +58,6 @@

#define OSS_POWEROFF 0x80

/*
* OSS Interrupt levels for various sub-systems
*
* This mapping is laid out with two things in mind: first, we try to keep
* things on their own levels to avoid having to do double-dispatches. Second,
* the levels match as closely as possible the alternate IRQ mapping mode (aka
* "A/UX mode") available on some VIA machines.
*/

#define OSS_IRQLEV_DISABLED 0
#define OSS_IRQLEV_IOPISM 1 /* ADB? */
#define OSS_IRQLEV_SCSI IRQ_AUTO_2
#define OSS_IRQLEV_NUBUS IRQ_AUTO_3 /* keep this on its own level */
#define OSS_IRQLEV_IOPSCC IRQ_AUTO_4 /* matches VIA alternate mapping */
#define OSS_IRQLEV_SOUND IRQ_AUTO_5 /* matches VIA alternate mapping */
#define OSS_IRQLEV_60HZ 6 /* matches VIA alternate mapping */
#define OSS_IRQLEV_VIA1 IRQ_AUTO_6 /* matches VIA alternate mapping */
#define OSS_IRQLEV_PARITY 7 /* matches VIA alternate mapping */

#ifndef __ASSEMBLY__

struct mac_oss {
Expand Down
6 changes: 3 additions & 3 deletions arch/m68k/include/asm/macints.h
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Original file line number Diff line number Diff line change
Expand Up @@ -104,6 +104,9 @@
#define IRQ_PSC4_3 (35)
#define IRQ_MAC_MACE_DMA IRQ_PSC4_3

/* OSS Level 4 interrupts */
#define IRQ_MAC_SCC (33)

/* Level 5 (PSC, AV Macs only) interrupts */
#define IRQ_PSC5_0 (40)
#define IRQ_PSC5_1 (41)
Expand Down Expand Up @@ -131,9 +134,6 @@
#define IRQ_BABOON_2 (66)
#define IRQ_BABOON_3 (67)

/* On non-PSC machines, the serial ports share an IRQ */
#define IRQ_MAC_SCC IRQ_AUTO_4

#define SLOT2IRQ(x) (x + 47)
#define IRQ2SLOT(x) (x - 47)

Expand Down
10 changes: 8 additions & 2 deletions arch/m68k/mac/config.c
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Original file line number Diff line number Diff line change
Expand Up @@ -893,8 +893,14 @@ static void __init mac_identify(void)
scc_b_rsrcs[1].start = scc_b_rsrcs[1].end = IRQ_MAC_SCC_B;
break;
default:
scc_a_rsrcs[1].start = scc_a_rsrcs[1].end = IRQ_MAC_SCC;
scc_b_rsrcs[1].start = scc_b_rsrcs[1].end = IRQ_MAC_SCC;
/* On non-PSC machines, the serial ports share an IRQ. */
if (macintosh_config->ident == MAC_MODEL_IIFX) {
scc_a_rsrcs[1].start = scc_a_rsrcs[1].end = IRQ_MAC_SCC;
scc_b_rsrcs[1].start = scc_b_rsrcs[1].end = IRQ_MAC_SCC;
} else {
scc_a_rsrcs[1].start = scc_a_rsrcs[1].end = IRQ_AUTO_4;
scc_b_rsrcs[1].start = scc_b_rsrcs[1].end = IRQ_AUTO_4;
}
break;
}

Expand Down
8 changes: 2 additions & 6 deletions arch/m68k/mac/iop.c
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Original file line number Diff line number Diff line change
Expand Up @@ -115,7 +115,6 @@
#include <asm/macintosh.h>
#include <asm/macints.h>
#include <asm/mac_iop.h>
#include <asm/mac_oss.h>

/*#define DEBUG_IOP*/

Expand Down Expand Up @@ -149,8 +148,6 @@ static struct listener iop_listeners[NUM_IOPS][NUM_IOP_CHAN];

irqreturn_t iop_ism_irq(int, void *);

extern void oss_irq_enable(int);

/*
* Private access functions
*/
Expand Down Expand Up @@ -304,11 +301,10 @@ void __init iop_init(void)
void __init iop_register_interrupts(void)
{
if (iop_ism_present) {
if (oss_present) {
if (request_irq(OSS_IRQLEV_IOPISM, iop_ism_irq, 0,
if (macintosh_config->ident == MAC_MODEL_IIFX) {
if (request_irq(IRQ_MAC_ADB, iop_ism_irq, 0,
"ISM IOP", (void *)IOP_NUM_ISM))
pr_err("Couldn't register ISM IOP interrupt\n");
oss_irq_enable(IRQ_MAC_ADB);
} else {
if (request_irq(IRQ_VIA2_0, iop_ism_irq, 0, "ISM IOP",
(void *)IOP_NUM_ISM))
Expand Down
45 changes: 10 additions & 35 deletions arch/m68k/mac/macints.c
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Original file line number Diff line number Diff line change
Expand Up @@ -26,10 +26,6 @@
* - slot 6: timer 1 (not on IIci)
* - slot 7: status of IRQ; signals 'any enabled int.'
*
* 2 - OSS (IIfx only?)
* - slot 0: SCSI interrupt
* - slot 1: Sound interrupt
*
* Levels 3-6 vary by machine type. For VIA or RBV Macintoshes:
*
* 3 - unused (?)
Expand All @@ -54,21 +50,18 @@
*
* 6 - VIA1
*
* For OSS Macintoshes (IIfx only at this point):
* For OSS Macintoshes (IIfx only), we apply an interrupt mapping similar to
* the Quadra (A/UX) mapping:
*
* 3 - Nubus interrupt
* - slot 0: Slot $9
* - slot 1: Slot $A
* - slot 2: Slot $B
* - slot 3: Slot $C
* - slot 4: Slot $D
* - slot 5: Slot $E
* 1 - ISM IOP (ADB)
*
* 4 - SCC IOP
* 2 - SCSI
*
* 5 - ISM IOP (ADB?)
* 3 - NuBus
*
* 6 - unused
* 4 - SCC IOP
*
* 6 - VIA1
*
* For PSC Macintoshes (660AV, 840AV):
*
Expand Down Expand Up @@ -112,14 +105,6 @@
* case. They're hidden behind the Nubus slot $C interrupt thus adding a
* third layer of indirection. Why oh why did the Apple engineers do that?
*
* - We support "fast" and "slow" handlers, just like the Amiga port. The
* fast handlers are called first and with all interrupts disabled. They
* are expected to execute quickly (hence the name). The slow handlers are
* called last with interrupts enabled and the interrupt level restored.
* They must therefore be reentrant.
*
* TODO:
*
*/

#include <linux/types.h>
Expand Down Expand Up @@ -216,8 +201,6 @@ void mac_irq_enable(struct irq_data *data)

switch(irq_src) {
case 1:
via_irq_enable(irq);
break;
case 2:
case 7:
if (oss_present)
Expand All @@ -226,17 +209,14 @@ void mac_irq_enable(struct irq_data *data)
via_irq_enable(irq);
break;
case 3:
case 4:
case 5:
case 6:
if (psc_present)
psc_irq_enable(irq);
else if (oss_present)
oss_irq_enable(irq);
break;
case 4:
if (psc_present)
psc_irq_enable(irq);
break;
case 8:
if (baboon_present)
baboon_irq_enable(irq);
Expand All @@ -251,8 +231,6 @@ void mac_irq_disable(struct irq_data *data)

switch(irq_src) {
case 1:
via_irq_disable(irq);
break;
case 2:
case 7:
if (oss_present)
Expand All @@ -261,17 +239,14 @@ void mac_irq_disable(struct irq_data *data)
via_irq_disable(irq);
break;
case 3:
case 4:
case 5:
case 6:
if (psc_present)
psc_irq_disable(irq);
else if (oss_present)
oss_irq_disable(irq);
break;
case 4:
if (psc_present)
psc_irq_disable(irq);
break;
case 8:
if (baboon_present)
baboon_irq_disable(irq);
Expand Down
97 changes: 53 additions & 44 deletions arch/m68k/mac/oss.c
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
/*
* OSS handling
* Operating System Services (OSS) chip handling
* Written by Joshua M. Thompson (funaho@jurai.org)
*
*
Expand Down Expand Up @@ -49,10 +49,8 @@ void __init oss_init(void)
/* do this by setting the source's interrupt level to zero. */

for (i = 0; i <= OSS_NUM_SOURCES; i++) {
oss->irq_level[i] = OSS_IRQLEV_DISABLED;
oss->irq_level[i] = 0;
}
/* If we disable VIA1 here, we never really handle it... */
oss->irq_level[OSS_VIA1] = OSS_IRQLEV_VIA1;
}

/*
Expand All @@ -64,34 +62,34 @@ void __init oss_nubus_init(void)
}

/*
* Handle miscellaneous OSS interrupts. Right now that's just sound
* and SCSI; everything else is routed to its own autovector IRQ.
* Handle miscellaneous OSS interrupts.
*/

static void oss_irq(unsigned int irq, struct irq_desc *desc)
{
int events;

events = oss->irq_pending & (OSS_IP_SOUND|OSS_IP_SCSI);
if (!events)
return;
int events = oss->irq_pending &
(OSS_IP_IOPSCC | OSS_IP_SCSI | OSS_IP_IOPISM);

#ifdef DEBUG_IRQS
if ((console_loglevel == 10) && !(events & OSS_IP_SCSI)) {
printk("oss_irq: irq %u events = 0x%04X\n", irq,
(int) oss->irq_pending);
}
#endif
/* FIXME: how do you clear a pending IRQ? */

if (events & OSS_IP_SOUND) {
oss->irq_pending &= ~OSS_IP_SOUND;
/* FIXME: call sound handler */
} else if (events & OSS_IP_SCSI) {
if (events & OSS_IP_IOPSCC) {
oss->irq_pending &= ~OSS_IP_IOPSCC;
generic_handle_irq(IRQ_MAC_SCC);
}

if (events & OSS_IP_SCSI) {
oss->irq_pending &= ~OSS_IP_SCSI;
generic_handle_irq(IRQ_MAC_SCSI);
} else {
/* FIXME: error check here? */
}

if (events & OSS_IP_IOPISM) {
oss->irq_pending &= ~OSS_IP_IOPISM;
generic_handle_irq(IRQ_MAC_ADB);
}
}

Expand Down Expand Up @@ -130,14 +128,29 @@ static void oss_nubus_irq(unsigned int irq, struct irq_desc *desc)

/*
* Register the OSS and NuBus interrupt dispatchers.
*
* This IRQ mapping is laid out with two things in mind: first, we try to keep
* things on their own levels to avoid having to do double-dispatches. Second,
* the levels match as closely as possible the alternate IRQ mapping mode (aka
* "A/UX mode") available on some VIA machines.
*/

#define OSS_IRQLEV_IOPISM IRQ_AUTO_1
#define OSS_IRQLEV_SCSI IRQ_AUTO_2
#define OSS_IRQLEV_NUBUS IRQ_AUTO_3
#define OSS_IRQLEV_IOPSCC IRQ_AUTO_4
#define OSS_IRQLEV_VIA1 IRQ_AUTO_6

void __init oss_register_interrupts(void)
{
irq_set_chained_handler(OSS_IRQLEV_SCSI, oss_irq);
irq_set_chained_handler(OSS_IRQLEV_NUBUS, oss_nubus_irq);
irq_set_chained_handler(OSS_IRQLEV_SOUND, oss_irq);
irq_set_chained_handler(OSS_IRQLEV_VIA1, via1_irq);
irq_set_chained_handler(OSS_IRQLEV_IOPISM, oss_irq);
irq_set_chained_handler(OSS_IRQLEV_SCSI, oss_irq);
irq_set_chained_handler(OSS_IRQLEV_NUBUS, oss_nubus_irq);
irq_set_chained_handler(OSS_IRQLEV_IOPSCC, oss_irq);
irq_set_chained_handler(OSS_IRQLEV_VIA1, via1_irq);

/* OSS_VIA1 gets enabled here because it has no machspec interrupt. */
oss->irq_level[OSS_VIA1] = IRQ_AUTO_6;
}

/*
Expand All @@ -156,13 +169,13 @@ void oss_irq_enable(int irq) {
switch(irq) {
case IRQ_MAC_SCC:
oss->irq_level[OSS_IOPSCC] = OSS_IRQLEV_IOPSCC;
break;
return;
case IRQ_MAC_ADB:
oss->irq_level[OSS_IOPISM] = OSS_IRQLEV_IOPISM;
break;
return;
case IRQ_MAC_SCSI:
oss->irq_level[OSS_SCSI] = OSS_IRQLEV_SCSI;
break;
return;
case IRQ_NUBUS_9:
case IRQ_NUBUS_A:
case IRQ_NUBUS_B:
Expand All @@ -171,13 +184,11 @@ void oss_irq_enable(int irq) {
case IRQ_NUBUS_E:
irq -= NUBUS_SOURCE_BASE;
oss->irq_level[irq] = OSS_IRQLEV_NUBUS;
break;
#ifdef DEBUG_IRQUSE
default:
printk("%s unknown irq %d\n", __func__, irq);
break;
#endif
return;
}

if (IRQ_SRC(irq) == 1)
via_irq_enable(irq);
}

/*
Expand All @@ -193,27 +204,25 @@ void oss_irq_disable(int irq) {
#endif
switch(irq) {
case IRQ_MAC_SCC:
oss->irq_level[OSS_IOPSCC] = OSS_IRQLEV_DISABLED;
break;
oss->irq_level[OSS_IOPSCC] = 0;
return;
case IRQ_MAC_ADB:
oss->irq_level[OSS_IOPISM] = OSS_IRQLEV_DISABLED;
break;
oss->irq_level[OSS_IOPISM] = 0;
return;
case IRQ_MAC_SCSI:
oss->irq_level[OSS_SCSI] = OSS_IRQLEV_DISABLED;
break;
oss->irq_level[OSS_SCSI] = 0;
return;
case IRQ_NUBUS_9:
case IRQ_NUBUS_A:
case IRQ_NUBUS_B:
case IRQ_NUBUS_C:
case IRQ_NUBUS_D:
case IRQ_NUBUS_E:
irq -= NUBUS_SOURCE_BASE;
oss->irq_level[irq] = OSS_IRQLEV_DISABLED;
break;
#ifdef DEBUG_IRQUSE
default:
printk("%s unknown irq %d\n", __func__, irq);
break;
#endif
oss->irq_level[irq] = 0;
return;
}

if (IRQ_SRC(irq) == 1)
via_irq_disable(irq);
}

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