patch-2.3.16 linux/arch/ppc/kernel/open_pic.c

• Lines: 465
• Date: Tue Aug 31 11:36:43 1999
• Orig file: v2.3.15/linux/arch/ppc/kernel/open_pic.c
• Orig date: Tue May 11 08:24:32 1999

diff -u --recursive --new-file v2.3.15/linux/arch/ppc/kernel/open_pic.c linux/arch/ppc/kernel/open_pic.c
@@ -1,11 +1,87 @@
-#include <linux/stddef.h>
-#include <linux/init.h>
+/*
+ *  arch/ppc/kernel/openpic.c -- OpenPIC Interrupt Handling
+ *
+ *  Copyright (C) 1997 Geert Uytterhoeven
+ *
+ *  This file is subject to the terms and conditions of the GNU General Public
+ *  License.  See the file COPYING in the main directory of this archive
+ *  for more details.
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
 #include <linux/sched.h>
-#include <linux/signal.h>
+#include <linux/init.h>
 #include <linux/openpic.h>
+#include <asm/ptrace.h>
+#include <asm/signal.h>
+#include <asm/io.h>
 #include <asm/irq.h>
-#include "open_pic.h"
-#include "i8259.h"
+#include "local_irq.h"
+
+volatile struct OpenPIC *OpenPIC = NULL;
+u_int OpenPIC_NumInitSenses __initdata = 0;
+u_char *OpenPIC_InitSenses __initdata = NULL;
+
+void chrp_mask_irq(unsigned int);
+void chrp_unmask_irq(unsigned int);
+
+static u_int NumProcessors;
+static u_int NumSources;
+
+struct hw_interrupt_type open_pic = {
+	" OpenPIC  ",
+	NULL,
+	NULL,
+	NULL,
+	openpic_enable_irq,
+	openpic_disable_irq,
+	0,
+	0
+};
+
+/*
+ *  Accesses to the current processor's registers
+ */
+#ifndef __powerpc__
+#define THIS_CPU		Private
+#define CHECK_THIS_CPU		do {} while (0)
+#else
+#define THIS_CPU		Processor[cpu]
+#define CHECK_THIS_CPU		check_arg_cpu(cpu)
+#endif
+
+#if 1
+#define check_arg_ipi(ipi) \
+    if (ipi < 0 || ipi >= OPENPIC_NUM_IPI) \
+	printk("openpic.c:%d: illegal ipi %d\n", __LINE__, ipi);
+#define check_arg_timer(timer) \
+    if (timer < 0 || timer >= OPENPIC_NUM_TIMERS) \
+	printk("openpic.c:%d: illegal timer %d\n", __LINE__, timer);
+#define check_arg_vec(vec) \
+    if (vec < 0 || vec >= OPENPIC_NUM_VECTORS) \
+	printk("openpic.c:%d: illegal vector %d\n", __LINE__, vec);
+#define check_arg_pri(pri) \
+    if (pri < 0 || pri >= OPENPIC_NUM_PRI) \
+	printk("openpic.c:%d: illegal priority %d\n", __LINE__, pri);
+#define check_arg_irq(irq) \
+    if (irq < 0 || irq >= (NumSources+open_pic.irq_offset)) \
+	printk("openpic.c:%d: illegal irq %d\n", __LINE__, irq);
+#define check_arg_cpu(cpu) \
+    if (cpu < 0 || cpu >= NumProcessors) \
+	printk("openpic.c:%d: illegal cpu %d\n", __LINE__, cpu);
+#else
+#define check_arg_ipi(ipi)	do {} while (0)
+#define check_arg_timer(timer)	do {} while (0)
+#define check_arg_vec(vec)	do {} while (0)
+#define check_arg_pri(pri)	do {} while (0)
+#define check_arg_irq(irq)	do {} while (0)
+#define check_arg_cpu(cpu)	do {} while (0)
+#endif
+
+static void no_action(int ir1, void *dev, struct pt_regs *regs)
+{
+}
 
 #ifdef __SMP__
 void openpic_ipi_action(int cpl, void *dev_id, struct pt_regs *regs)
@@ -14,35 +90,349 @@
 }
 #endif /* __SMP__ */
 
-void chrp_mask_and_ack_irq(unsigned int irq_nr)
+#ifdef __i386__
+static inline u_int ld_le32(volatile u_int *addr)
 {
-	if (is_8259_irq(irq_nr))
-	    i8259_pic.mask_and_ack(irq_nr);
+	return *addr;
 }
 
-static void chrp_mask_irq(unsigned int irq_nr)
+static inline void out_le32(volatile u_int *addr, u_int val)
 {
-	if (is_8259_irq(irq_nr))
-		i8259_pic.disable(irq_nr);
-	else
-		openpic_disable_irq(irq_to_openpic(irq_nr));
+	*addr = val;
+}
+#endif
+
+u_int openpic_read(volatile u_int *addr)
+{
+	u_int val;
+
+	val = ld_le32(addr);
+	return val;
+}
+
+static inline void openpic_write(volatile u_int *addr, u_int val)
+{
+	out_le32(addr, val);
+}
+
+static inline u_int openpic_readfield(volatile u_int *addr, u_int mask)
+{
+	u_int val = openpic_read(addr);
+	return val & mask;
+}
+
+inline void openpic_writefield(volatile u_int *addr, u_int mask,
+			       u_int field)
+{
+	u_int val = openpic_read(addr);
+	openpic_write(addr, (val & ~mask) | (field & mask));
+}
+
+static inline void openpic_clearfield(volatile u_int *addr, u_int mask)
+{
+	openpic_writefield(addr, mask, 0);
+}
+
+static inline void openpic_setfield(volatile u_int *addr, u_int mask)
+{
+	openpic_writefield(addr, mask, mask);
+}
+
+static void openpic_safe_writefield(volatile u_int *addr, u_int mask,
+				    u_int field)
+{
+	openpic_setfield(addr, OPENPIC_MASK);
+	/* wait until it's not in use */
+	while (openpic_read(addr) & OPENPIC_ACTIVITY);
+	openpic_writefield(addr, mask | OPENPIC_MASK, field | OPENPIC_MASK);
 }
 
-static void chrp_unmask_irq(unsigned int irq_nr)
+void __init openpic_init(int main_pic)
 {
-	if (is_8259_irq(irq_nr))
-		i8259_pic.enable(irq_nr);
+	u_int t, i;
+	u_int timerfreq;
+	const char *version;
+
+	if (!OpenPIC)
+		panic("No OpenPIC found");
+
+	if ( ppc_md.progress ) ppc_md.progress("openpic enter",0x122);
+
+	t = openpic_read(&OpenPIC->Global.Feature_Reporting0);
+	switch (t & OPENPIC_FEATURE_VERSION_MASK) {
+	case 1:
+		version = "1.0";
+		break;
+	case 2:
+		version = "1.2";
+		break;
+	case 3:
+		version = "1.3";
+		break;
+	default:
+		version = "?";
+		break;
+	}
+	NumProcessors = ((t & OPENPIC_FEATURE_LAST_PROCESSOR_MASK) >>
+			 OPENPIC_FEATURE_LAST_PROCESSOR_SHIFT) + 1;
+	NumSources = ((t & OPENPIC_FEATURE_LAST_SOURCE_MASK) >>
+		      OPENPIC_FEATURE_LAST_SOURCE_SHIFT) + 1;
+
+	printk("OpenPIC Version %s (%d CPUs and %d IRQ sources) at %p\n", version,
+	       NumProcessors, NumSources, OpenPIC);
+	timerfreq = openpic_read(&OpenPIC->Global.Timer_Frequency);
+	printk("OpenPIC timer frequency is ");
+	if (timerfreq)
+		printk("%d Hz\n", timerfreq);
 	else
-		openpic_enable_irq(irq_to_openpic(irq_nr));
+		printk("not set\n");
+
+	if ( main_pic )
+	{
+		/* Initialize timer interrupts */
+		if ( ppc_md.progress ) ppc_md.progress("openpic timer",0x3ba);
+		for (i = 0; i < OPENPIC_NUM_TIMERS; i++) {
+			/* Disabled, Priority 0 */
+			openpic_inittimer(i, 0, OPENPIC_VEC_TIMER+i);
+			/* No processor */
+			openpic_maptimer(i, 0);
+		}
+	    
+		/* Initialize IPI interrupts */
+		if ( ppc_md.progress ) ppc_md.progress("openpic ipi",0x3bb);
+		for (i = 0; i < OPENPIC_NUM_IPI; i++) {
+			/* Disabled, Priority 0 */
+			openpic_initipi(i, 0, OPENPIC_VEC_IPI+i);
+		}
+	    
+		/* Initialize external interrupts */
+		if ( ppc_md.progress ) ppc_md.progress("openpic ext",0x3bc);
+		/* SIOint (8259 cascade) is special */
+		openpic_initirq(0, 8, open_pic.irq_offset, 1, 1);
+		openpic_mapirq(0, 1<<0);
+		for (i = 1; i < NumSources; i++) {
+			/* Enabled, Priority 8 */
+			openpic_initirq(i, 8, open_pic.irq_offset+i, 0,
+					i < OpenPIC_NumInitSenses ? OpenPIC_InitSenses[i] : 1);
+			/* Processor 0 */
+			openpic_mapirq(i, 1<<0);
+		}
+	    
+		/* Initialize the spurious interrupt */
+		if ( ppc_md.progress ) ppc_md.progress("openpic spurious",0x3bd);
+		openpic_set_spurious(OPENPIC_VEC_SPURIOUS);
+		if ( _machine != _MACH_gemini )
+		{
+			if (request_irq(IRQ_8259_CASCADE, no_action, SA_INTERRUPT,
+					"82c59 cascade", NULL))
+				printk("Unable to get OpenPIC IRQ 0 for cascade\n");
+		}
+		openpic_set_priority(0, 0);
+		openpic_disable_8259_pass_through();
+	}
+	if ( ppc_md.progress ) ppc_md.progress("openpic exit",0x222);
 }
 
-struct hw_interrupt_type open_pic = {
-	" OpenPIC  ",
-	NULL,
-	NULL,
-	NULL,
-	chrp_unmask_irq,
-	chrp_mask_irq,
-	chrp_mask_and_ack_irq,
-	0
-};
+void openpic_reset(void)
+{
+	openpic_setfield(&OpenPIC->Global.Global_Configuration0,
+			 OPENPIC_CONFIG_RESET);
+}
+
+void openpic_enable_8259_pass_through(void)
+{
+	openpic_clearfield(&OpenPIC->Global.Global_Configuration0,
+			   OPENPIC_CONFIG_8259_PASSTHROUGH_DISABLE);
+}
+
+void openpic_disable_8259_pass_through(void)
+{
+	openpic_setfield(&OpenPIC->Global.Global_Configuration0,
+			 OPENPIC_CONFIG_8259_PASSTHROUGH_DISABLE);
+}
+
+#ifndef __i386__
+/*
+ *  Find out the current interrupt
+ */
+u_int openpic_irq(u_int cpu)
+{
+	u_int vec;
+
+	check_arg_cpu(cpu);
+	vec = openpic_readfield(&OpenPIC->THIS_CPU.Interrupt_Acknowledge,
+				OPENPIC_VECTOR_MASK);
+	return vec;
+}
+#endif
+
+#ifndef __powerpc__
+void openpic_eoi(void)
+#else
+void openpic_eoi(u_int cpu)
+#endif
+{
+	check_arg_cpu(cpu);
+	openpic_write(&OpenPIC->THIS_CPU.EOI, 0);
+}
+
+
+#ifndef __powerpc__
+u_int openpic_get_priority(void)
+#else
+u_int openpic_get_priority(u_int cpu)
+#endif
+{
+	CHECK_THIS_CPU;
+	return openpic_readfield(&OpenPIC->THIS_CPU.Current_Task_Priority,
+				 OPENPIC_CURRENT_TASK_PRIORITY_MASK);
+}
+
+#ifndef __powerpc__
+void openpic_set_priority(u_int pri)
+#else
+void openpic_set_priority(u_int cpu, u_int pri)
+#endif
+{
+	CHECK_THIS_CPU;
+	check_arg_pri(pri);
+	openpic_writefield(&OpenPIC->THIS_CPU.Current_Task_Priority,
+			   OPENPIC_CURRENT_TASK_PRIORITY_MASK, pri);
+}
+
+/*
+ *  Get/set the spurious vector
+ */
+u_int openpic_get_spurious(void)
+{
+	return openpic_readfield(&OpenPIC->Global.Spurious_Vector,
+				 OPENPIC_VECTOR_MASK);
+}
+
+void openpic_set_spurious(u_int vec)
+{
+	check_arg_vec(vec);
+	openpic_writefield(&OpenPIC->Global.Spurious_Vector, OPENPIC_VECTOR_MASK,
+			   vec);
+}
+
+void openpic_init_processor(u_int cpumask)
+{
+	openpic_write(&OpenPIC->Global.Processor_Initialization, cpumask);
+}
+
+/*
+ *  Initialize an interprocessor interrupt (and disable it)
+ *
+ *  ipi: OpenPIC interprocessor interrupt number
+ *  pri: interrupt source priority
+ *  vec: the vector it will produce
+ */
+void openpic_initipi(u_int ipi, u_int pri, u_int vec)
+{
+	check_arg_timer(ipi);
+	check_arg_pri(pri);
+	check_arg_vec(vec);
+	openpic_safe_writefield(&OpenPIC->Global.IPI_Vector_Priority(ipi),
+				OPENPIC_PRIORITY_MASK | OPENPIC_VECTOR_MASK,
+				(pri << OPENPIC_PRIORITY_SHIFT) | vec);
+}
+
+/*
+ *  Send an IPI to one or more CPUs
+ */
+#ifndef __powerpc__
+void openpic_cause_IPI(u_int ipi, u_int cpumask)
+#else
+void openpic_cause_IPI(u_int cpu, u_int ipi, u_int cpumask)
+#endif
+{
+	CHECK_THIS_CPU;
+	check_arg_ipi(ipi);
+	openpic_write(&OpenPIC->THIS_CPU.IPI_Dispatch(ipi), cpumask);
+}
+
+/*
+ *  Initialize a timer interrupt (and disable it)
+ *
+ *  timer: OpenPIC timer number
+ *  pri: interrupt source priority
+ *  vec: the vector it will produce
+ */
+void openpic_inittimer(u_int timer, u_int pri, u_int vec)
+{
+	check_arg_timer(timer);
+	check_arg_pri(pri);
+	check_arg_vec(vec);
+	openpic_safe_writefield(&OpenPIC->Global.Timer[timer].Vector_Priority,
+				OPENPIC_PRIORITY_MASK | OPENPIC_VECTOR_MASK,
+				(pri << OPENPIC_PRIORITY_SHIFT) | vec);
+}
+
+/*
+ *  Map a timer interrupt to one or more CPUs
+ */
+void openpic_maptimer(u_int timer, u_int cpumask)
+{
+	check_arg_timer(timer);
+	openpic_write(&OpenPIC->Global.Timer[timer].Destination, cpumask);
+}
+
+/*
+ *  Enable/disable an interrupt source
+ */
+void openpic_enable_irq(u_int irq)
+{
+	check_arg_irq(irq);
+	openpic_clearfield(&OpenPIC->Source[irq].Vector_Priority, OPENPIC_MASK);
+}
+
+void openpic_disable_irq(u_int irq)
+{
+	check_arg_irq(irq);
+	openpic_setfield(&OpenPIC->Source[irq].Vector_Priority, OPENPIC_MASK);
+}
+
+/*
+ *  Initialize an interrupt source (and disable it!)
+ *
+ *  irq: OpenPIC interrupt number
+ *  pri: interrupt source priority
+ *  vec: the vector it will produce
+ *  pol: polarity (1 for positive, 0 for negative)
+ *  sense: 1 for level, 0 for edge
+ */
+void openpic_initirq(u_int irq, u_int pri, u_int vec, int pol, int sense)
+{
+	check_arg_irq(irq);
+	check_arg_pri(pri);
+	check_arg_vec(vec);
+	openpic_safe_writefield(&OpenPIC->Source[irq].Vector_Priority,
+				OPENPIC_PRIORITY_MASK | OPENPIC_VECTOR_MASK |
+				OPENPIC_SENSE_POLARITY | OPENPIC_SENSE_LEVEL,
+				(pri << OPENPIC_PRIORITY_SHIFT) | vec |
+				(pol ? OPENPIC_SENSE_POLARITY : 0) |
+				(sense ? OPENPIC_SENSE_LEVEL : 0));
+}
+
+/*
+ *  Map an interrupt source to one or more CPUs
+ */
+void openpic_mapirq(u_int irq, u_int cpumask)
+{
+	check_arg_irq(irq);
+	openpic_write(&OpenPIC->Source[irq].Destination, cpumask);
+}
+
+/*
+ *  Set the sense for an interrupt source (and disable it!)
+ *
+ *  sense: 1 for level, 0 for edge
+ */
+void openpic_set_sense(u_int irq, int sense)
+{
+	check_arg_irq(irq);
+	openpic_safe_writefield(&OpenPIC->Source[irq].Vector_Priority,
+				OPENPIC_SENSE_LEVEL,
+				(sense ? OPENPIC_SENSE_LEVEL : 0));
+}