1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
302 lines
7.0 KiB
C
302 lines
7.0 KiB
C
/*
|
|
* OSS handling
|
|
* Written by Joshua M. Thompson (funaho@jurai.org)
|
|
*
|
|
*
|
|
* This chip is used in the IIfx in place of VIA #2. It acts like a fancy
|
|
* VIA chip with prorammable interrupt levels.
|
|
*
|
|
* 990502 (jmt) - Major rewrite for new interrupt architecture as well as some
|
|
* recent insights into OSS operational details.
|
|
* 990610 (jmt) - Now taking fulll advantage of the OSS. Interrupts are mapped
|
|
* to mostly match the A/UX interrupt scheme supported on the
|
|
* VIA side. Also added support for enabling the ISM irq again
|
|
* since we now have a functional IOP manager.
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/init.h>
|
|
|
|
#include <asm/bootinfo.h>
|
|
#include <asm/machw.h>
|
|
#include <asm/macintosh.h>
|
|
#include <asm/macints.h>
|
|
#include <asm/mac_via.h>
|
|
#include <asm/mac_oss.h>
|
|
|
|
int oss_present;
|
|
volatile struct mac_oss *oss;
|
|
|
|
irqreturn_t oss_irq(int, void *, struct pt_regs *);
|
|
irqreturn_t oss_nubus_irq(int, void *, struct pt_regs *);
|
|
|
|
extern irqreturn_t via1_irq(int, void *, struct pt_regs *);
|
|
extern irqreturn_t mac_scc_dispatch(int, void *, struct pt_regs *);
|
|
|
|
/*
|
|
* Initialize the OSS
|
|
*
|
|
* The OSS "detection" code is actually in via_init() which is always called
|
|
* before us. Thus we can count on oss_present being valid on entry.
|
|
*/
|
|
|
|
void __init oss_init(void)
|
|
{
|
|
int i;
|
|
|
|
if (!oss_present) return;
|
|
|
|
oss = (struct mac_oss *) OSS_BASE;
|
|
|
|
/* Disable all interrupts. Unlike a VIA it looks like we */
|
|
/* 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;
|
|
}
|
|
/* If we disable VIA1 here, we never really handle it... */
|
|
oss->irq_level[OSS_VIA1] = OSS_IRQLEV_VIA1;
|
|
}
|
|
|
|
/*
|
|
* Register the OSS and NuBus interrupt dispatchers.
|
|
*/
|
|
|
|
void __init oss_register_interrupts(void)
|
|
{
|
|
cpu_request_irq(OSS_IRQLEV_SCSI, oss_irq, IRQ_FLG_LOCK,
|
|
"scsi", (void *) oss);
|
|
cpu_request_irq(OSS_IRQLEV_IOPSCC, mac_scc_dispatch, IRQ_FLG_LOCK,
|
|
"scc", mac_scc_dispatch);
|
|
cpu_request_irq(OSS_IRQLEV_NUBUS, oss_nubus_irq, IRQ_FLG_LOCK,
|
|
"nubus", (void *) oss);
|
|
cpu_request_irq(OSS_IRQLEV_SOUND, oss_irq, IRQ_FLG_LOCK,
|
|
"sound", (void *) oss);
|
|
cpu_request_irq(OSS_IRQLEV_VIA1, via1_irq, IRQ_FLG_LOCK,
|
|
"via1", (void *) via1);
|
|
}
|
|
|
|
/*
|
|
* Initialize OSS for Nubus access
|
|
*/
|
|
|
|
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.
|
|
*/
|
|
|
|
irqreturn_t oss_irq(int irq, void *dev_id, struct pt_regs *regs)
|
|
{
|
|
int events;
|
|
|
|
events = oss->irq_pending & (OSS_IP_SOUND|OSS_IP_SCSI);
|
|
if (!events)
|
|
return IRQ_NONE;
|
|
|
|
#ifdef DEBUG_IRQS
|
|
if ((console_loglevel == 10) && !(events & OSS_IP_SCSI)) {
|
|
printk("oss_irq: irq %d events = 0x%04X\n", irq,
|
|
(int) oss->irq_pending);
|
|
}
|
|
#endif
|
|
/* FIXME: how do you clear a pending IRQ? */
|
|
|
|
if (events & OSS_IP_SOUND) {
|
|
/* FIXME: call sound handler */
|
|
oss->irq_pending &= ~OSS_IP_SOUND;
|
|
} else if (events & OSS_IP_SCSI) {
|
|
oss->irq_level[OSS_SCSI] = OSS_IRQLEV_DISABLED;
|
|
mac_do_irq_list(IRQ_MAC_SCSI, regs);
|
|
oss->irq_pending &= ~OSS_IP_SCSI;
|
|
oss->irq_level[OSS_SCSI] = OSS_IRQLEV_SCSI;
|
|
} else {
|
|
/* FIXME: error check here? */
|
|
}
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/*
|
|
* Nubus IRQ handler, OSS style
|
|
*
|
|
* Unlike the VIA/RBV this is on its own autovector interrupt level.
|
|
*/
|
|
|
|
irqreturn_t oss_nubus_irq(int irq, void *dev_id, struct pt_regs *regs)
|
|
{
|
|
int events, irq_bit, i;
|
|
|
|
events = oss->irq_pending & OSS_IP_NUBUS;
|
|
if (!events)
|
|
return IRQ_NONE;
|
|
|
|
#ifdef DEBUG_NUBUS_INT
|
|
if (console_loglevel > 7) {
|
|
printk("oss_nubus_irq: events = 0x%04X\n", events);
|
|
}
|
|
#endif
|
|
/* There are only six slots on the OSS, not seven */
|
|
|
|
for (i = 0, irq_bit = 1 ; i < 6 ; i++, irq_bit <<= 1) {
|
|
if (events & irq_bit) {
|
|
oss->irq_level[i] = OSS_IRQLEV_DISABLED;
|
|
mac_do_irq_list(NUBUS_SOURCE_BASE + i, regs);
|
|
oss->irq_pending &= ~irq_bit;
|
|
oss->irq_level[i] = OSS_IRQLEV_NUBUS;
|
|
}
|
|
}
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/*
|
|
* Enable an OSS interrupt
|
|
*
|
|
* It looks messy but it's rather straightforward. The switch() statement
|
|
* just maps the machspec interrupt numbers to the right OSS interrupt
|
|
* source (if the OSS handles that interrupt) and then sets the interrupt
|
|
* level for that source to nonzero, thus enabling the interrupt.
|
|
*/
|
|
|
|
void oss_irq_enable(int irq) {
|
|
#ifdef DEBUG_IRQUSE
|
|
printk("oss_irq_enable(%d)\n", irq);
|
|
#endif
|
|
switch(irq) {
|
|
case IRQ_SCC:
|
|
case IRQ_SCCA:
|
|
case IRQ_SCCB:
|
|
oss->irq_level[OSS_IOPSCC] = OSS_IRQLEV_IOPSCC;
|
|
break;
|
|
case IRQ_MAC_ADB:
|
|
oss->irq_level[OSS_IOPISM] = OSS_IRQLEV_IOPISM;
|
|
break;
|
|
case IRQ_MAC_SCSI:
|
|
oss->irq_level[OSS_SCSI] = OSS_IRQLEV_SCSI;
|
|
break;
|
|
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_NUBUS;
|
|
break;
|
|
#ifdef DEBUG_IRQUSE
|
|
default:
|
|
printk("%s unknown irq %d\n",__FUNCTION__, irq);
|
|
break;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Disable an OSS interrupt
|
|
*
|
|
* Same as above except we set the source's interrupt level to zero,
|
|
* to disable the interrupt.
|
|
*/
|
|
|
|
void oss_irq_disable(int irq) {
|
|
#ifdef DEBUG_IRQUSE
|
|
printk("oss_irq_disable(%d)\n", irq);
|
|
#endif
|
|
switch(irq) {
|
|
case IRQ_SCC:
|
|
case IRQ_SCCA:
|
|
case IRQ_SCCB:
|
|
oss->irq_level[OSS_IOPSCC] = OSS_IRQLEV_DISABLED;
|
|
break;
|
|
case IRQ_MAC_ADB:
|
|
oss->irq_level[OSS_IOPISM] = OSS_IRQLEV_DISABLED;
|
|
break;
|
|
case IRQ_MAC_SCSI:
|
|
oss->irq_level[OSS_SCSI] = OSS_IRQLEV_DISABLED;
|
|
break;
|
|
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", __FUNCTION__, irq);
|
|
break;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Clear an OSS interrupt
|
|
*
|
|
* Not sure if this works or not but it's the only method I could
|
|
* think of based on the contents of the mac_oss structure.
|
|
*/
|
|
|
|
void oss_irq_clear(int irq) {
|
|
/* FIXME: how to do this on OSS? */
|
|
switch(irq) {
|
|
case IRQ_SCC:
|
|
case IRQ_SCCA:
|
|
case IRQ_SCCB:
|
|
oss->irq_pending &= ~OSS_IP_IOPSCC;
|
|
break;
|
|
case IRQ_MAC_ADB:
|
|
oss->irq_pending &= ~OSS_IP_IOPISM;
|
|
break;
|
|
case IRQ_MAC_SCSI:
|
|
oss->irq_pending &= ~OSS_IP_SCSI;
|
|
break;
|
|
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_pending &= ~(1 << irq);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check to see if a specific OSS interrupt is pending
|
|
*/
|
|
|
|
int oss_irq_pending(int irq)
|
|
{
|
|
switch(irq) {
|
|
case IRQ_SCC:
|
|
case IRQ_SCCA:
|
|
case IRQ_SCCB:
|
|
return oss->irq_pending & OSS_IP_IOPSCC;
|
|
break;
|
|
case IRQ_MAC_ADB:
|
|
return oss->irq_pending & OSS_IP_IOPISM;
|
|
break;
|
|
case IRQ_MAC_SCSI:
|
|
return oss->irq_pending & OSS_IP_SCSI;
|
|
break;
|
|
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;
|
|
return oss->irq_pending & (1 << irq);
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|