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Diffstat (limited to 'arch/m68k/mac/oss.c')
-rw-r--r--arch/m68k/mac/oss.c228
1 files changed, 77 insertions, 151 deletions
diff --git a/arch/m68k/mac/oss.c b/arch/m68k/mac/oss.c
index 33354769272..54037125ebf 100644
--- a/arch/m68k/mac/oss.c
+++ b/arch/m68k/mac/oss.c
@@ -1,5 +1,5 @@
/*
- * OSS handling
+ * Operating System Services (OSS) chip handling
* Written by Joshua M. Thompson (funaho@jurai.org)
*
*
@@ -8,7 +8,7 @@
*
* 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
+ * 990610 (jmt) - Now taking full 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.
@@ -19,9 +19,8 @@
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/init.h>
+#include <linux/irq.h>
-#include <asm/bootinfo.h>
-#include <asm/machw.h>
#include <asm/macintosh.h>
#include <asm/macints.h>
#include <asm/mac_via.h>
@@ -30,12 +29,6 @@
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
*
@@ -55,28 +48,8 @@ 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;
-}
-
-/*
- * 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);
}
/*
@@ -88,38 +61,35 @@ 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.
*/
-irqreturn_t oss_irq(int irq, void *dev_id, struct pt_regs *regs)
+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 IRQ_NONE;
+ 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 %d events = 0x%04X\n", irq,
+ 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) {
- /* 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);
+
+ 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;
- oss->irq_level[OSS_SCSI] = OSS_IRQLEV_SCSI;
- } else {
- /* FIXME: error check here? */
+ generic_handle_irq(IRQ_MAC_SCSI);
+ }
+
+ if (events & OSS_IP_IOPISM) {
+ oss->irq_pending &= ~OSS_IP_IOPISM;
+ generic_handle_irq(IRQ_MAC_ADB);
}
- return IRQ_HANDLED;
}
/*
@@ -128,13 +98,13 @@ irqreturn_t oss_irq(int irq, void *dev_id, struct pt_regs *regs)
* 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)
+static void oss_nubus_irq(unsigned int irq, struct irq_desc *desc)
{
int events, irq_bit, i;
events = oss->irq_pending & OSS_IP_NUBUS;
if (!events)
- return IRQ_NONE;
+ return;
#ifdef DEBUG_NUBUS_INT
if (console_loglevel > 7) {
@@ -143,15 +113,43 @@ irqreturn_t oss_nubus_irq(int irq, void *dev_id, struct pt_regs *regs)
#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;
- mac_do_irq_list(NUBUS_SOURCE_BASE + i, regs);
oss->irq_pending &= ~irq_bit;
- oss->irq_level[i] = OSS_IRQLEV_NUBUS;
+ generic_handle_irq(NUBUS_SOURCE_BASE + i);
}
- }
- return IRQ_HANDLED;
+ } while(events & (irq_bit - 1));
+}
+
+/*
+ * 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_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;
}
/*
@@ -168,17 +166,15 @@ void oss_irq_enable(int irq) {
printk("oss_irq_enable(%d)\n", irq);
#endif
switch(irq) {
- case IRQ_SCC:
- case IRQ_SCCA:
- case IRQ_SCCB:
+ 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:
@@ -187,13 +183,11 @@ 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",__FUNCTION__, irq);
- break;
-#endif
+ return;
}
+
+ if (IRQ_SRC(irq) == 1)
+ via_irq_enable(irq);
}
/*
@@ -208,55 +202,15 @@ void oss_irq_disable(int irq) {
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_SCC:
+ oss->irq_level[OSS_IOPSCC] = 0;
+ return;
case IRQ_MAC_ADB:
- oss->irq_pending &= ~OSS_IP_IOPISM;
- break;
+ oss->irq_level[OSS_IOPISM] = 0;
+ return;
case IRQ_MAC_SCSI:
- oss->irq_pending &= ~OSS_IP_SCSI;
- break;
+ oss->irq_level[OSS_SCSI] = 0;
+ return;
case IRQ_NUBUS_9:
case IRQ_NUBUS_A:
case IRQ_NUBUS_B:
@@ -264,38 +218,10 @@ void oss_irq_clear(int irq) {
case IRQ_NUBUS_D:
case IRQ_NUBUS_E:
irq -= NUBUS_SOURCE_BASE;
- oss->irq_pending &= ~(1 << irq);
- break;
+ oss->irq_level[irq] = 0;
+ return;
}
-}
-
-/*
- * 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;
+ if (IRQ_SRC(irq) == 1)
+ via_irq_disable(irq);
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-05 17:28:13 +0000