[PATCH] H8/300: Interrupt handling cleanup

 - merge common routine
 - runtime vector setup update

arch/h8300/kernel/Makefile

@@ -4,7 +4,7 @@
 
 extra-y := vmlinux.lds.s
 
-obj-y := process.o traps.o ptrace.o \
+obj-y := process.o traps.o ptrace.o ints.o \
 	 sys_h8300.o time.o semaphore.o signal.o \
          setup.o h8300_ksyms.o gpio.o init_task.o \
          syscalls.o

arch/h8300/platform/h8300h/ints.c → arch/h8300/kernel/ints.c

@@ -28,9 +28,7 @@
 #include <asm/traps.h>
 #include <asm/io.h>
 #include <asm/setup.h>
-#include <asm/gpio.h>
 #include <asm/hardirq.h>
-#include <asm/regs306x.h>
 #include <asm/errno.h>
 
 /*
@@ -48,11 +46,16 @@ static irq_handler_t *irq_list[NR_IRQS];
 static int use_kmalloc;
 
 extern unsigned long *interrupt_redirect_table;
+extern const int h8300_saved_vectors[];
+extern const unsigned long h8300_trap_table[];
+int h8300_enable_irq_pin(unsigned int irq);
+void h8300_disable_irq_pin(unsigned int irq);
 
 #define CPU_VECTOR ((unsigned long *)0x000000)
 #define ADDR_MASK (0xffffff)
 
-static inline unsigned long *get_vector_address(void)
+#if defined(CONFIG_RAMKERNEL)
+static unsigned long __init *get_vector_address(void)
 {
 	unsigned long *rom_vector = CPU_VECTOR;
 	unsigned long base,tmp;
@@ -61,7 +64,7 @@ static inline unsigned long *get_vector_address(void)
 	base = rom_vector[EXT_IRQ0] & ADDR_MASK;
 	
 	/* check romvector format */
-	for (vec_no = EXT_IRQ1; vec_no <= EXT_IRQ5; vec_no++) {
+	for (vec_no = EXT_IRQ1; vec_no <= EXT_IRQ0+EXT_IRQS; vec_no++) {
 		if ((base+(vec_no - EXT_IRQ0)*4) != (rom_vector[vec_no] & ADDR_MASK))
 			return NULL;
 	}
@@ -76,19 +79,15 @@ static inline unsigned long *get_vector_address(void)
 		return NULL;
 	return (unsigned long *)base;
 }
+#endif
 
 void __init init_IRQ(void)
 {
 #if defined(CONFIG_RAMKERNEL)
 	int i;
 	unsigned long *ramvec,*ramvec_p;
-	unsigned long break_vec;
-
-#if defined(CONFIG_GDB_DEBUG)
-	break_vec = ramvec[TRAP3_VEC];
-#else
-	break_vec = VECTOR(trace_break);
-#endif
+	const unsigned long *trap_entry;
+	const int *saved_vector;
 
 	ramvec = get_vector_address();
 	if (ramvec == NULL)
@@ -96,14 +95,27 @@ void __init init_IRQ(void)
 	else
 		printk("virtual vector at 0x%08lx\n",(unsigned long)ramvec);
 
-	for (ramvec_p = ramvec, i = 0; i < NR_IRQS; i++)
+	/* create redirect table */
+	ramvec_p = ramvec;
+	trap_entry = h8300_trap_table;
+	saved_vector = h8300_saved_vectors;
+	for ( i = 0; i < NR_IRQS; i++) {
+		if (i == *saved_vector) {
+			ramvec_p++;
+			saved_vector++;
+		} else {
+			if ( i < NR_TRAPS ) {
+				if (*trap_entry)
+					*ramvec_p = VECTOR(*trap_entry);
+				ramvec_p++;
+				trap_entry++;
+			} else
 				*ramvec_p++ = REDIRECT(interrupt_entry);
-
-	ramvec[TRAP0_VEC] = VECTOR(system_call);
-	ramvec[TRAP3_VEC] = break_vec;
+		}
+	}
 	interrupt_redirect_table = ramvec;
 #ifdef DUMP_VECTOR
-	ramvec_p = interrupt_redirect_table;
+	ramvec_p = ramvec;
 	for (i = 0; i < NR_IRQS; i++) {
 		if ((i % 8) == 0)
 			printk("\n%p: ",ramvec_p);
@@ -124,18 +136,8 @@ int request_irq(unsigned int irq,
 		printk("Incorrect IRQ %d from %s\n", irq, devname);
 		return -EINVAL;
 	}
-	if (irq_list[irq])
-		return -EBUSY;
-	if (irq >= EXT_IRQ0 && irq <= EXT_IRQ3) {
-		if (H8300_GPIO_RESERVE(H8300_GPIO_P8, 1 << (irq - EXT_IRQ0)) == 0)
-			return -EBUSY;
-		H8300_GPIO_DDR(H8300_GPIO_P8, (irq - EXT_IRQ0), 0);
-	}
-	if (irq >= EXT_IRQ4 && irq <= EXT_IRQ5) {
-		if (H8300_GPIO_RESERVE(H8300_GPIO_P9, 1 << (irq - EXT_IRQ0)) == 0)
+	if (irq_list[irq] || (h8300_enable_irq_pin(irq) == -EBUSY))
 		return -EBUSY;
-		H8300_GPIO_DDR(H8300_GPIO_P9, (irq - EXT_IRQ0), 0);
-	}
 
 	if (use_kmalloc)
 		irq_handle = (irq_handler_t *)kmalloc(sizeof(irq_handler_t), GFP_ATOMIC);
@@ -167,8 +169,7 @@ void free_irq(unsigned int irq, void *dev_id)
 	if (!irq_list[irq] || irq_list[irq]->dev_id != dev_id)
 		printk("Removing probably wrong IRQ %d from %s\n",
 		       irq, irq_list[irq]->devname);
-	if (irq >= EXT_IRQ0 && irq <= EXT_IRQ5)
-		*(volatile unsigned char *)IER &= ~(1 << (irq - EXT_IRQ0));
+	h8300_disable_irq_pin(irq);
 	if (((unsigned long)irq_list[irq] & 0x80000000) == 0) {
 		kfree(irq_list[irq]);
 		irq_list[irq] = NULL;
@@ -196,30 +197,26 @@ EXPORT_SYMBOL(probe_irq_off);
 
 void enable_irq(unsigned int irq)
 {
-	if (irq >= EXT_IRQ0 && irq <= EXT_IRQ5) {
-		*(volatile unsigned char *)IER |= (1 << (irq - EXT_IRQ0));
-		*(volatile unsigned char *)ISR &= ~(1 << (irq - EXT_IRQ0));
-	}
+	if (irq >= EXT_IRQ0 && irq <= (EXT_IRQ0 + EXT_IRQS))
+		IER_REGS |= 1 << (irq - EXT_IRQ0);
 }
 
 void disable_irq(unsigned int irq)
 {
-	if (irq >= EXT_IRQ0 && irq <= EXT_IRQ5) {
-		*(volatile unsigned char *)IER &= ~(1 << (irq - EXT_IRQ0));
-	}
+	if (irq >= EXT_IRQ0 && irq <= (EXT_IRQ0 + EXT_IRQS))
+		IER_REGS &= ~(1 << (irq - EXT_IRQ0));
 }
 
-asmlinkage void process_int(int vec, struct pt_regs *fp)
+asmlinkage void process_int(int irq, struct pt_regs *fp)
 {
 	irq_enter();
-	if (vec >= EXT_IRQ0 && vec <= EXT_IRQ5)
-		*(volatile unsigned char *)ISR &= ~(1 << (vec - EXT_IRQ0));
-	if (vec < NR_IRQS) {
-		if (irq_list[vec]) {
-			irq_list[vec]->handler(vec, irq_list[vec]->dev_id, fp);
-			irq_list[vec]->count++;
-			if (irq_list[vec]->flags & SA_SAMPLE_RANDOM)
-				add_interrupt_randomness(vec);
+	h8300_clear_isr(irq);
+	if (irq >= NR_TRAPS && irq < NR_IRQS) {
+		if (irq_list[irq]) {
+			irq_list[irq]->handler(irq, irq_list[irq]->dev_id, fp);
+			irq_list[irq]->count++;
+			if (irq_list[irq]->flags & SA_SAMPLE_RANDOM)
+				add_interrupt_randomness(irq);
 		}
 	} else {
 		BUG();

arch/h8300/platform/h8300h/Makefile

@@ -4,15 +4,5 @@
 # Reuse any files we can from the H8/300H
 #
 
-#VPATH := $(VPATH):$(BOARD)
+obj-y := entry.o ints_h8300h.o
 
-.S.o:
-	$(CC) -D__ASSEMBLY__ $(AFLAGS) -I. -c $< -o $*.o
-
-obj-y := entry.o ints.o
-
-$(BOARD)/crt0_$(MODEL).o: $(BOARD)/crt0_$(MODEL).S
-
-entry.o: entry.S
-
-ints.o: ints.c

arch/h8300/platform/h8300h/ints_h8300h.c

+/*
+ * linux/arch/h8300/platform/h8300h/ints_h8300h.c
+ * Interrupt handling CPU variants
+ *
+ * Yoshinori Sato <ysato@users.sourceforge.jp>
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+
+#include <asm/ptrace.h>
+#include <asm/traps.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/gpio.h>
+#include <asm/regs306x.h>
+
+/* saved vector list */
+const int __initdata h8300_saved_vectors[]={
+#if defined(CONFIG_GDB_DEBUG)
+	TRAP3_VEC,
+#endif
+	-1
+};
+
+/* trap entry table */
+const unsigned long __initdata h8300_trap_table[NR_TRAPS]={
+	0,0,0,0,0,0,0,0,
+	(unsigned long)system_call,  /* TRAPA #0 */
+	0,0,
+	(unsigned long)trace_break,  /* TRAPA #3 */
+};
+
+int h8300_enable_irq_pin(unsigned int irq)
+{
+	int bitmask;
+	if (irq < EXT_IRQ0 || irq > EXT_IRQ5)
+		return 0;
+
+	/* initialize IRQ pin */
+	bitmask = 1 << (irq - EXT_IRQ0);
+	switch(irq) {
+	case EXT_IRQ0:
+	case EXT_IRQ1:
+	case EXT_IRQ2:
+	case EXT_IRQ3:
+		if (H8300_GPIO_RESERVE(H8300_GPIO_P8, bitmask) == 0)
+			return -EBUSY;
+		H8300_GPIO_DDR(H8300_GPIO_P8, bitmask, H8300_GPIO_INPUT);
+		break;
+	case EXT_IRQ4:
+	case EXT_IRQ5:
+		if (H8300_GPIO_RESERVE(H8300_GPIO_P9, bitmask) == 0)
+			return -EBUSY;
+		H8300_GPIO_DDR(H8300_GPIO_P9, bitmask, H8300_GPIO_INPUT);
+		break;
+	}
+
+	return 0;
+}
+
+void h8300_disable_irq_pin(unsigned int irq)
+{
+	int bitmask;
+	if (irq < EXT_IRQ0 || irq > EXT_IRQ5)
+		return;
+
+	/* disable interrupt & release IRQ pin */
+	bitmask = 1 << (irq - EXT_IRQ0);
+	switch(irq) {
+	case EXT_IRQ0:
+	case EXT_IRQ1:
+	case EXT_IRQ2:
+	case EXT_IRQ3:
+		*(volatile unsigned char *)IER &= ~bitmask;
+		H8300_GPIO_FREE(H8300_GPIO_P8, bitmask);
+		break ;
+	case EXT_IRQ4:
+	case EXT_IRQ5:
+		*(volatile unsigned char *)IER &= ~bitmask;
+		H8300_GPIO_FREE(H8300_GPIO_P9, bitmask);
+		break;
+	}
+}

arch/h8300/platform/h8s/Makefile

@@ -4,15 +4,4 @@
 # Reuse any files we can from the H8S
 #
 
-#VPATH := $(VPATH):$(BOARD)
-
-.S.o:
-	$(CC) -D__ASSEMBLY__ $(AFLAGS) -I. -c $< -o $*.o
-
-obj-y := entry.o ints.o
-
-$(BOARD)/crt0_$(MODEL).o: $(BOARD)/crt0_$(MODEL).S
-
-entry.o: entry.S
-
-ints.o: ints.c
+obj-y := entry.o ints_h8s.o

arch/h8300/platform/h8s/ints_h8s.c

+/*
+ * linux/arch/h8300/platform/h8s/ints_h8s.c
+ * Interrupt handling CPU variants
+ *
+ * Yoshinori Sato <ysato@users.sourceforge.jp>
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+
+#include <asm/ptrace.h>
+#include <asm/traps.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/gpio.h>
+#include <asm/regs267x.h>
+
+/* saved vector list */
+const int __initdata h8300_saved_vectors[]={
+#if defined(CONFIG_GDB_DEBUG)
+	TRACE_VEC,
+	TRAP3_VEC,
+#endif
+	-1
+};
+
+/* trap entry table */
+const unsigned long __initdata h8300_trap_table[NR_TRAPS]={
+	0,0,0,0,0,
+	(unsigned long)trace_break,  /* TRACE */
+	0,0,
+	(unsigned long)system_call,  /* TRAPA #0 */
+	0,0,0,0,0,0,0
+};
+
+/* IRQ pin assignment */
+struct irq_pins {
+	unsigned char port_no;
+	unsigned char bit_no;
+} __attribute__((aligned(1),packed));
+/* ISTR = 0 */
+const static struct irq_pins irq_assign_table0[16]={
+        {H8300_GPIO_P5,H8300_GPIO_B0},{H8300_GPIO_P5,H8300_GPIO_B1},
+	{H8300_GPIO_P5,H8300_GPIO_B2},{H8300_GPIO_P5,H8300_GPIO_B3},
+	{H8300_GPIO_P5,H8300_GPIO_B4},{H8300_GPIO_P5,H8300_GPIO_B5},
+	{H8300_GPIO_P5,H8300_GPIO_B6},{H8300_GPIO_P5,H8300_GPIO_B7},
+	{H8300_GPIO_P6,H8300_GPIO_B0},{H8300_GPIO_P6,H8300_GPIO_B1},
+	{H8300_GPIO_P6,H8300_GPIO_B2},{H8300_GPIO_P6,H8300_GPIO_B3},
+	{H8300_GPIO_P6,H8300_GPIO_B4},{H8300_GPIO_P6,H8300_GPIO_B5},
+	{H8300_GPIO_PF,H8300_GPIO_B1},{H8300_GPIO_PF,H8300_GPIO_B2},
+}; 
+/* ISTR = 1 */
+const static struct irq_pins irq_assign_table1[16]={
+	{H8300_GPIO_P8,H8300_GPIO_B0},{H8300_GPIO_P8,H8300_GPIO_B1},
+	{H8300_GPIO_P8,H8300_GPIO_B2},{H8300_GPIO_P8,H8300_GPIO_B3},
+	{H8300_GPIO_P8,H8300_GPIO_B4},{H8300_GPIO_P8,H8300_GPIO_B5},
+	{H8300_GPIO_PH,H8300_GPIO_B2},{H8300_GPIO_PH,H8300_GPIO_B3},
+	{H8300_GPIO_P2,H8300_GPIO_B0},{H8300_GPIO_P2,H8300_GPIO_B1},
+	{H8300_GPIO_P2,H8300_GPIO_B2},{H8300_GPIO_P2,H8300_GPIO_B3},
+	{H8300_GPIO_P2,H8300_GPIO_B4},{H8300_GPIO_P2,H8300_GPIO_B5},
+	{H8300_GPIO_P2,H8300_GPIO_B6},{H8300_GPIO_P2,H8300_GPIO_B7},
+};
+
+#define IRQ_GPIO_MAP(irqbit,port,bit)				  \
+do {								  \
+	if (*(volatile unsigned short *)ITSR & irqbit) {	  \
+		port = irq_assign_table1[irq - EXT_IRQ0].port_no; \
+		bit  = irq_assign_table1[irq - EXT_IRQ0].bit_no;  \
+	} else {						  \
+		port = irq_assign_table0[irq - EXT_IRQ0].port_no; \
+		bit  = irq_assign_table0[irq - EXT_IRQ0].bit_no;  \
+	}							  \
+} while(0)
+
+int h8300_enable_irq_pin(unsigned int irq)
+{
+	if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15) {
+		unsigned short ptn = 1 << (irq - EXT_IRQ0);
+		unsigned int port_no,bit_no;
+		IRQ_GPIO_MAP(ptn,port_no,bit_no);
+		if (H8300_GPIO_RESERVE(port_no, bit_no) == 0)
+			return -EBUSY;                   /* pin already use */
+		H8300_GPIO_DDR(port_no, bit_no, H8300_GPIO_INPUT);
+		*(volatile unsigned short *)ISR &= ~ptn; /* ISR clear */
+	}		
+	return 0;
+}
+
+void h8300_disable_irq_pin(unsigned int irq)
+{
+	if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15) {
+		/* disable interrupt & release IRQ pin */
+		unsigned short ptn = 1 << (irq - EXT_IRQ0);
+		unsigned short port_no,bit_no;
+		*(volatile unsigned short *)ISR &= ~ptn;
+		*(volatile unsigned short *)IER &= ~ptn;
+		IRQ_GPIO_MAP(ptn,port_no,bit_no);
+		H8300_GPIO_FREE(port_no, bit_no);
+	}
+}

include/asm-h8300/irq.h

@@ -13,6 +13,16 @@
 #define EXT_IRQ5 17
 #define EXT_IRQ6 18
 #define EXT_IRQ7 19
+#define EXT_IRQS 5
+
+#include <asm/regs306x.h>
+#define h8300_clear_isr(irq)                                                \
+do {                                                                        \
+	if (irq >= EXT_IRQ0 && irq <= EXT_IRQ5)                             \
+		*(volatile unsigned char *)ISR &= ~(1 << (irq - EXT_IRQ0)); \
+} while(0)
+
+#define IER_REGS *(volatile unsigned char *)IER
 #endif
 #if defined(CONFIG_CPU_H8S)
 #define NR_IRQS 128
@@ -32,6 +42,16 @@
 #define EXT_IRQ13 29
 #define EXT_IRQ14 30
 #define EXT_IRQ15 31
+#define EXT_IRQS 15
+
+#include <asm/regs267x.h>
+#define h8300_clear_isr(irq)                                                 \
+do {                                                                         \
+	if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15)                             \
+		*(volatile unsigned short *)ISR &= ~(1 << (irq - EXT_IRQ0)); \
+} while(0)
+
+#define IER_REGS *(volatile unsigned short *)IER
 #endif
 
 static __inline__ int irq_canonicalize(int irq)

include/asm-h8300/traps.h

@@ -20,9 +20,18 @@ extern void trace_break(void);
 #define VECTOR(address) ((JMP_OP)|((unsigned long)address))
 #define REDIRECT(address) ((JSR_OP)|((unsigned long)address))
 
+#define TRACE_VEC 5
+
 #define TRAP0_VEC 8
 #define TRAP1_VEC 9
 #define TRAP2_VEC 10
 #define TRAP3_VEC 11
 
+#if defined(__H8300H__)
+#define NR_TRAPS 12
+#endif
+#if defined(__H8300S__)
+#define NR_TRAPS 16
+#endif
+
 #endif /* _H8300_TRAPS_H */