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Subject[PATCH 12/21] introduce irq controller
Introduce irq controller and use it to manage auto vector interrupts.
Introduce setup_irq() which can be used for irq setup.

Signed-off-by: Roman Zippel <zippel@linux-m68k.org>

---
arch/m68k/amiga/amiints.c | 4 -
arch/m68k/bvme6000/bvmeints.c | 1
arch/m68k/kernel/ints.c | 171 +++++++++++++++++++++++++++++-----------
arch/m68k/mac/config.c | 15 ----
arch/m68k/mac/macints.c | 7 --
arch/m68k/mvme147/147ints.c | 1
arch/m68k/mvme16x/16xints.c | 1
arch/m68k/q40/config.c | 2
arch/m68k/q40/q40ints.c | 17 ----
drivers/block/amiflop.c | 1
include/asm-m68k/atari_stdma.h | 2
include/asm-m68k/irq.h | 25 ++++--
12 files changed, 148 insertions(+), 99 deletions(-)
565955489c28c96c32f022d473c7c141e1856874
diff --git a/arch/m68k/amiga/amiints.c b/arch/m68k/amiga/amiints.c
index d02458e..e2d47b7 100644
--- a/arch/m68k/amiga/amiints.c
+++ b/arch/m68k/amiga/amiints.c
@@ -40,6 +40,7 @@ #include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/kernel_stat.h>
#include <linux/init.h>
+#include <linux/interrupt.h>
#include <linux/errno.h>
#include <linux/seq_file.h>

@@ -484,13 +485,10 @@ static irqreturn_t ami_int7(int irq, voi
}

irqreturn_t (*amiga_default_handler[SYS_IRQS])(int, void *, struct pt_regs *) = {
- [0] = ami_badint,
[1] = ami_int1,
- [2] = ami_badint,
[3] = ami_int3,
[4] = ami_int4,
[5] = ami_int5,
- [6] = ami_badint,
[7] = ami_int7
};

diff --git a/arch/m68k/bvme6000/bvmeints.c b/arch/m68k/bvme6000/bvmeints.c
index 298a8df..b015fdc 100644
--- a/arch/m68k/bvme6000/bvmeints.c
+++ b/arch/m68k/bvme6000/bvmeints.c
@@ -14,6 +14,7 @@
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/errno.h>
+#include <linux/interrupt.h>
#include <linux/seq_file.h>

#include <asm/ptrace.h>
diff --git a/arch/m68k/kernel/ints.c b/arch/m68k/kernel/ints.c
index 3ce7c61..c7f6ee6 100644
--- a/arch/m68k/kernel/ints.c
+++ b/arch/m68k/kernel/ints.c
@@ -45,7 +45,15 @@ #include <asm/q40ints.h>
#endif

/* table for system interrupt handlers */
-static irq_handler_t irq_list[SYS_IRQS];
+static struct irq_node *irq_list[SYS_IRQS];
+static struct irq_controller *irq_controller[SYS_IRQS];
+
+static struct irq_controller auto_irq_controller = {
+ .name = "auto",
+ .lock = SPIN_LOCK_UNLOCKED,
+ .startup = m68k_irq_startup,
+ .shutdown = m68k_irq_shutdown,
+};

static const char *default_names[SYS_IRQS] = {
[0] = "spurious int",
@@ -101,17 +109,13 @@ void __init init_IRQ(void)
hardirq_mask_is_broken();
}

- for (i = 0; i < SYS_IRQS; i++) {
- if (mach_default_handler)
- irq_list[i].handler = (*mach_default_handler)[i];
- irq_list[i].flags = 0;
- irq_list[i].dev_id = NULL;
- irq_list[i].devname = default_names[i];
+ for (i = IRQ_AUTO_1; i <= IRQ_AUTO_7; i++) {
+ irq_controller[i] = &auto_irq_controller;
+ if (mach_default_handler && (*mach_default_handler)[i])
+ cpu_request_irq(i, (*mach_default_handler)[i],
+ 0, default_names[i], NULL);
}

- for (i = 0; i < NUM_IRQ_NODES; i++)
- nodes[i].handler = NULL;
-
mach_init_IRQ ();
}

@@ -120,9 +124,12 @@ irq_node_t *new_irq_node(void)
irq_node_t *node;
short i;

- for (node = nodes, i = NUM_IRQ_NODES-1; i >= 0; node++, i--)
- if (!node->handler)
+ for (node = nodes, i = NUM_IRQ_NODES-1; i >= 0; node++, i--) {
+ if (!node->handler) {
+ memset(node, 0, sizeof(*node));
return node;
+ }
+ }

printk ("new_irq_node: out of nodes\n");
return NULL;
@@ -149,55 +156,115 @@ void free_irq(unsigned int irq, void *de

EXPORT_SYMBOL(free_irq);

-int cpu_request_irq(unsigned int irq,
- irqreturn_t (*handler)(int, void *, struct pt_regs *),
- unsigned long flags, const char *devname, void *dev_id)
+int setup_irq(unsigned int irq, struct irq_node *node)
{
- if (irq < IRQ_AUTO_1 || irq > IRQ_AUTO_7) {
+ struct irq_controller *contr;
+ struct irq_node **prev;
+ unsigned long flags;
+
+ if (irq >= SYS_IRQS || !(contr = irq_controller[irq])) {
printk("%s: Incorrect IRQ %d from %s\n",
- __FUNCTION__, irq, devname);
+ __FUNCTION__, irq, node->devname);
return -ENXIO;
}

-#if 0
- if (!(irq_list[irq].flags & IRQ_FLG_STD)) {
- if (irq_list[irq].flags & IRQ_FLG_LOCK) {
- printk("%s: IRQ %d from %s is not replaceable\n",
- __FUNCTION__, irq, irq_list[irq].devname);
- return -EBUSY;
- }
- if (!(flags & IRQ_FLG_REPLACE)) {
- printk("%s: %s can't replace IRQ %d from %s\n",
- __FUNCTION__, devname, irq, irq_list[irq].devname);
+ spin_lock_irqsave(&contr->lock, flags);
+
+ prev = irq_list + irq;
+ if (*prev) {
+ /* Can't share interrupts unless both agree to */
+ if (!((*prev)->flags & node->flags & SA_SHIRQ)) {
+ spin_unlock_irqrestore(&contr->lock, flags);
return -EBUSY;
}
+ while (*prev)
+ prev = &(*prev)->next;
}
-#endif

- irq_list[irq].handler = handler;
- irq_list[irq].flags = flags;
- irq_list[irq].dev_id = dev_id;
- irq_list[irq].devname = devname;
+ if (!irq_list[irq]) {
+ if (contr->startup)
+ contr->startup(irq);
+ else
+ contr->enable(irq);
+ }
+ node->next = NULL;
+ *prev = node;
+
+ spin_unlock_irqrestore(&contr->lock, flags);
+
return 0;
}

+int cpu_request_irq(unsigned int irq,
+ irqreturn_t (*handler)(int, void *, struct pt_regs *),
+ unsigned long flags, const char *devname, void *dev_id)
+{
+ struct irq_node *node;
+ int res;
+
+ node = new_irq_node();
+ if (!node)
+ return -ENOMEM;
+
+ node->handler = handler;
+ node->flags = flags;
+ node->dev_id = dev_id;
+ node->devname = devname;
+
+ res = setup_irq(irq, node);
+ if (res)
+ node->handler = NULL;
+
+ return res;
+}
+
void cpu_free_irq(unsigned int irq, void *dev_id)
{
- if (irq < IRQ_AUTO_1 || irq > IRQ_AUTO_7) {
+ struct irq_controller *contr;
+ struct irq_node **p, *node;
+ unsigned long flags;
+
+ if (irq >= SYS_IRQS || !(contr = irq_controller[irq])) {
printk("%s: Incorrect IRQ %d\n", __FUNCTION__, irq);
return;
}

- if (irq_list[irq].dev_id != dev_id)
- printk("%s: Removing probably wrong IRQ %d from %s\n",
- __FUNCTION__, irq, irq_list[irq].devname);
+ spin_lock_irqsave(&contr->lock, flags);
+
+ p = irq_list + irq;
+ while ((node = *p)) {
+ if (node->dev_id == dev_id)
+ break;
+ p = &node->next;
+ }
+
+ if (node) {
+ *p = node->next;
+ node->handler = NULL;
+ } else
+ printk("%s: Removing probably wrong IRQ %d\n",
+ __FUNCTION__, irq);
+
+ if (!irq_list[irq])
+ contr->shutdown(irq);

- irq_list[irq].handler = (*mach_default_handler)[irq];
- irq_list[irq].flags = 0;
- irq_list[irq].dev_id = NULL;
- irq_list[irq].devname = default_names[irq];
+ spin_unlock_irqrestore(&contr->lock, flags);
}

+int m68k_irq_startup(unsigned int irq)
+{
+ if (irq <= IRQ_AUTO_7)
+ vectors[VEC_SPUR + irq] = auto_inthandler;
+ return 0;
+}
+
+void m68k_irq_shutdown(unsigned int irq)
+{
+ if (irq <= IRQ_AUTO_7)
+ vectors[VEC_SPUR + irq] = bad_inthandler;
+}
+
+
/*
* Do we need these probe functions on the m68k?
*
@@ -250,8 +317,14 @@ static void dummy_free_irq(unsigned int

asmlinkage void m68k_handle_int(unsigned int irq, struct pt_regs *regs)
{
+ struct irq_node *node;
+
kstat_cpu(0).irqs[irq]++;
- irq_list[irq].handler(irq, irq_list[irq].dev_id, regs);
+ node = irq_list[irq];
+ do {
+ node->handler(irq, node->dev_id, regs);
+ node = node->next;
+ } while (node);
}

asmlinkage void handle_badint(struct pt_regs *regs)
@@ -262,16 +335,18 @@ asmlinkage void handle_badint(struct pt_

int show_interrupts(struct seq_file *p, void *v)
{
+ struct irq_controller *contr;
+ struct irq_node *node;
int i = *(loff_t *) v;

/* autovector interrupts */
- if (i < SYS_IRQS) {
- if (mach_default_handler) {
- seq_printf(p, "auto %2d: %10u ", i,
- i ? kstat_cpu(0).irqs[i] : num_spurious);
- seq_puts(p, " ");
- seq_printf(p, "%s\n", irq_list[i].devname);
- }
+ if (i < SYS_IRQS && irq_list[i]) {
+ contr = irq_controller[i];
+ node = irq_list[i];
+ seq_printf(p, "%s %u: %10u %s", contr->name, i, kstat_cpu(0).irqs[i], node->devname);
+ while ((node = node->next))
+ seq_printf(p, ", %s", node->devname);
+ seq_puts(p, "\n");
} else if (i == SYS_IRQS)
mach_get_irq_list(p, v);
return 0;
diff --git a/arch/m68k/mac/config.c b/arch/m68k/mac/config.c
index 19dce75..7e04f2a 100644
--- a/arch/m68k/mac/config.c
+++ b/arch/m68k/mac/config.c
@@ -94,20 +94,6 @@ static void mac_sched_init(irqreturn_t (
via_init_clock(vector);
}

-extern irqreturn_t mac_default_handler(int, void *, struct pt_regs *);
-
-irqreturn_t (*mac_handlers[8])(int, void *, struct pt_regs *)=
-{
- mac_default_handler,
- mac_default_handler,
- mac_default_handler,
- mac_default_handler,
- mac_default_handler,
- mac_default_handler,
- mac_default_handler,
- mac_default_handler
-};
-
/*
* Parse a Macintosh-specific record in the bootinfo
*/
@@ -188,7 +174,6 @@ void __init config_mac(void)
enable_irq = mac_enable_irq;
disable_irq = mac_disable_irq;
mach_get_model = mac_get_model;
- mach_default_handler = &mac_handlers;
mach_get_irq_list = show_mac_interrupts;
mach_gettimeoffset = mac_gettimeoffset;
#warning move to adb/via init
diff --git a/arch/m68k/mac/macints.c b/arch/m68k/mac/macints.c
index 7a1600b..73b39cd 100644
--- a/arch/m68k/mac/macints.c
+++ b/arch/m68k/mac/macints.c
@@ -637,13 +637,6 @@ int show_mac_interrupts(struct seq_file
return 0;
}

-void mac_default_handler(int irq, void *dev_id, struct pt_regs *regs)
-{
-#ifdef DEBUG_SPURIOUS
- printk("Unexpected IRQ %d on device %p\n", irq, dev_id);
-#endif
-}
-
static int num_debug[8];

irqreturn_t mac_debug_handler(int irq, void *dev_id, struct pt_regs *regs)
diff --git a/arch/m68k/mvme147/147ints.c b/arch/m68k/mvme147/147ints.c
index 69a744e..b4aa5e8 100644
--- a/arch/m68k/mvme147/147ints.c
+++ b/arch/m68k/mvme147/147ints.c
@@ -14,6 +14,7 @@
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/errno.h>
+#include <linux/interrupt.h>
#include <linux/seq_file.h>

#include <asm/ptrace.h>
diff --git a/arch/m68k/mvme16x/16xints.c b/arch/m68k/mvme16x/16xints.c
index 793ef73..81afada 100644
--- a/arch/m68k/mvme16x/16xints.c
+++ b/arch/m68k/mvme16x/16xints.c
@@ -14,6 +14,7 @@
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/errno.h>
+#include <linux/interrupt.h>
#include <linux/seq_file.h>

#include <asm/system.h>
diff --git a/arch/m68k/q40/config.c b/arch/m68k/q40/config.c
index 5e0f9b0..01fd662 100644
--- a/arch/m68k/q40/config.c
+++ b/arch/m68k/q40/config.c
@@ -37,7 +37,6 @@ #include <asm/machdep.h>
#include <asm/q40_master.h>

extern irqreturn_t q40_process_int (int level, struct pt_regs *regs);
-extern irqreturn_t (*q40_default_handler[]) (int, void *, struct pt_regs *); /* added just for debugging */
extern void q40_init_IRQ (void);
extern void q40_free_irq (unsigned int, void *);
extern int show_q40_interrupts (struct seq_file *, void *);
@@ -181,7 +180,6 @@ void __init config_q40(void)
mach_request_irq = q40_request_irq;
enable_irq = q40_enable_irq;
disable_irq = q40_disable_irq;
- mach_default_handler = &q40_default_handler;
mach_get_model = q40_get_model;
mach_get_hardware_list = q40_get_hardware_list;

diff --git a/arch/m68k/q40/q40ints.c b/arch/m68k/q40/q40ints.c
index b106839..ff80cba 100644
--- a/arch/m68k/q40/q40ints.c
+++ b/arch/m68k/q40/q40ints.c
@@ -46,7 +46,6 @@ irqreturn_t q40_irq2_handler (int, void


static irqreturn_t q40_defhand (int irq, void *dev_id, struct pt_regs *fp);
-static irqreturn_t default_handler(int lev, void *dev_id, struct pt_regs *regs);


#define DEVNAME_SIZE 24
@@ -415,22 +414,6 @@ static irqreturn_t q40_defhand (int irq,
else master_outb(-1,KEYBOARD_UNLOCK_REG);
return IRQ_NONE;
}
-static irqreturn_t default_handler(int lev, void *dev_id, struct pt_regs *regs)
-{
- printk ("Uninitialised interrupt level %d\n", lev);
- return IRQ_NONE;
-}
-
-irqreturn_t (*q40_default_handler[SYS_IRQS])(int, void *, struct pt_regs *) = {
- [0] = default_handler,
- [1] = default_handler,
- [2] = default_handler,
- [3] = default_handler,
- [4] = default_handler,
- [5] = default_handler,
- [6] = default_handler,
- [7] = default_handler
-};


void q40_enable_irq (unsigned int irq)
diff --git a/drivers/block/amiflop.c b/drivers/block/amiflop.c
index 2a8af68..2641597 100644
--- a/drivers/block/amiflop.c
+++ b/drivers/block/amiflop.c
@@ -64,6 +64,7 @@ #include <linux/amifd.h>
#include <linux/buffer_head.h>
#include <linux/blkdev.h>
#include <linux/elevator.h>
+#include <linux/interrupt.h>

#include <asm/setup.h>
#include <asm/uaccess.h>
diff --git a/include/asm-m68k/atari_stdma.h b/include/asm-m68k/atari_stdma.h
index 64f9288..b4eadf8 100644
--- a/include/asm-m68k/atari_stdma.h
+++ b/include/asm-m68k/atari_stdma.h
@@ -3,7 +3,7 @@ #ifndef _atari_stdma_h
#define _atari_stdma_h


-#include <asm/irq.h>
+#include <linux/interrupt.h>


/***************************** Prototypes *****************************/
diff --git a/include/asm-m68k/irq.h b/include/asm-m68k/irq.h
index 320a084..7fa8733 100644
--- a/include/asm-m68k/irq.h
+++ b/include/asm-m68k/irq.h
@@ -1,7 +1,8 @@
#ifndef _M68K_IRQ_H_
#define _M68K_IRQ_H_

-#include <linux/interrupt.h>
+#include <linux/hardirq.h>
+#include <linux/spinlock_types.h>

/*
* # of m68k auto vector interrupts
@@ -81,7 +82,7 @@ #define disable_irq_nosync disable_irq
struct pt_regs;

extern int cpu_request_irq(unsigned int,
- irqreturn_t (*)(int, void *, struct pt_regs *),
+ int (*)(int, void *, struct pt_regs *),
unsigned long, const char *, void *);
extern void cpu_free_irq(unsigned int, void *);

@@ -103,23 +104,35 @@ #endif
* interrupt source (if it supports chaining).
*/
typedef struct irq_node {
- irqreturn_t (*handler)(int, void *, struct pt_regs *);
- unsigned long flags;
+ int (*handler)(int, void *, struct pt_regs *);
void *dev_id;
- const char *devname;
struct irq_node *next;
+ unsigned long flags;
+ const char *devname;
} irq_node_t;

/*
* This structure has only 4 elements for speed reasons
*/
typedef struct irq_handler {
- irqreturn_t (*handler)(int, void *, struct pt_regs *);
+ int (*handler)(int, void *, struct pt_regs *);
unsigned long flags;
void *dev_id;
const char *devname;
} irq_handler_t;

+struct irq_controller {
+ const char *name;
+ spinlock_t lock;
+ int (*startup)(unsigned int irq);
+ void (*shutdown)(unsigned int irq);
+ void (*enable)(unsigned int irq);
+ void (*disable)(unsigned int irq);
+};
+
+extern int m68k_irq_startup(unsigned int);
+extern void m68k_irq_shutdown(unsigned int);
+
/* count of spurious interrupts */
extern volatile unsigned int num_spurious;

--
1.3.3
--

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