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#include "common.h"
#include <ddekit/interrupt.h>
#include <ddekit/memory.h>
#include <ddekit/panic.h>
#include <ddekit/semaphore.h>
#include <ddekit/thread.h>
#ifdef DDEBUG_LEVEL_IRQ
#undef DDEBUG
#define DDEBUG DDEBUG_LEVEL_IRQ
#endif
#include "debug.h"
struct ddekit_irq_s {
int irq;
int notify_id;
int irq_hook;
int shared;
void(*thread_init)(void *);
void(*handler)(void *);
void *priv;
int enabled;
ddekit_thread_t *th;
ddekit_sem_t *sem;
struct ddekit_irq_s *next;
};
static struct ddekit_irq_s *irqs = 0;
static ddekit_lock_t lock;
static int next_notify_id = 0; /* TODO: This is only incremented and after
* enough interrupt attachments/detachments
* we can run out of legal IDs (this is however
* very atypical use case) */
/******************************************************************************
* Local helpers *
*****************************************************************************/
static void ddekit_irq_lock(void);
static void ddekit_irq_unlock(void);
static struct ddekit_irq_s* find_by_irq(int irq);
static struct ddekit_irq_s* find_by_irq_id(int irq_id);
static void ddekit_irq_remove(struct ddekit_irq_s *irq_s);
static void ddekit_irq_thread(void *data);
/******************************************************************************
* ddekit_irq_lock *
*****************************************************************************/
static void ddekit_irq_lock(void)
{
ddekit_lock_lock(&lock);
}
/******************************************************************************
* ddekit_irq_unlock *
*****************************************************************************/
static void ddekit_irq_unlock(void)
{
ddekit_lock_unlock(&lock);
}
/******************************************************************************
* find_by_irq *
*****************************************************************************/
static struct ddekit_irq_s * find_by_irq(int irq)
{
struct ddekit_irq_s * irq_s;
ddekit_irq_lock();
if (!irqs) {
return 0;
}
irq_s = irqs;
while(irq_s) {
if(irq_s->irq==irq)
break;
irq_s = irq_s->next;
}
ddekit_irq_unlock();
return irq_s;
}
/******************************************************************************
* find_by_irq_id *
*****************************************************************************/
static struct ddekit_irq_s * find_by_irq_id(int irq_id)
{
struct ddekit_irq_s * irq_s;
ddekit_irq_lock();
if (!irqs) {
return 0;
}
irq_s = irqs;
while(irq_s) {
if(irq_s->notify_id==irq_id)
break;
irq_s = irq_s->next;
}
ddekit_irq_unlock();
return irq_s;
}
/******************************************************************************
* ddekit_irq_remove *
*****************************************************************************/
static void ddekit_irq_remove(struct ddekit_irq_s *irq_s)
{
struct ddekit_irq_s *i;
ddekit_irq_lock();
if(!irqs) {
ddekit_irq_unlock();
return;
}
if(irqs==irq_s) {
irqs=irq_s->next;
ddekit_irq_unlock();
return;
}
i = irqs;
while(i) {
if (i->next == irq_s) {
i->next = irq_s->next;
ddekit_irq_unlock();
return;
}
i = i->next;
}
ddekit_irq_unlock();
}
/******************************************************************************
* ddekit_irq_thread *
*****************************************************************************/
static void ddekit_irq_thread(void *data)
{
/* For each IRQ line an own thread is started */
struct ddekit_irq_s *irq_s = (struct ddekit_irq_s *) data;
/* call IRQ thread init function */
irq_s->thread_init(irq_s->priv);
while(1) {
/* Wait for IRQs */
DDEBUG_MSG_VERBOSE("wating for IRQ %d to occur", irq_s->irq);
ddekit_sem_down(irq_s->sem);
DDEBUG_MSG_VERBOSE("executing handler for IRQ %d", irq_s->irq);
irq_s->handler(irq_s->priv);
}
}
/******************************************************************************
* DDEKIT public API (include/dde/ddekit) *
*****************************************************************************/
/******************************************************************************
* ddekit_interrupt_attach *
*****************************************************************************/
ddekit_thread_t *ddekit_interrupt_attach(int irq,
int shared,
void(*thread_init)(void *),
void(*handler)(void *),
void *priv)
{
struct ddekit_irq_s *irq_s;
int err_code;
char name[32];
irq_s = (struct ddekit_irq_s *)
ddekit_simple_malloc(sizeof(struct ddekit_irq_s));
irq_s->sem = ddekit_sem_init(0);
irq_s->irq = irq; /* represents real IRQ number */
ddekit_irq_lock();
irq_s->notify_id = next_notify_id; /* represents kernel's IRQ ID */
irq_s->irq_hook = next_notify_id; /* after given ID is passed to
* kernel, this field will be
* set to real irq_hook */
next_notify_id++; /* next time, assign different
* ID so we can distinguish
* interrupts */
ddekit_irq_unlock();
irq_s->shared = shared;
irq_s->thread_init = thread_init;
irq_s->handler = handler;
irq_s->priv = priv;
irq_s->next = 0;
irq_s->enabled = 1;
/* create interrupt thread */
snprintf(name, 32, "ddekit_irq_%d",irq);
irq_s->th = ddekit_thread_create(ddekit_irq_thread, irq_s, name);
/* try attaching to IRQ */
/* do not automatically re-enable interupts */
if (0 != (err_code = sys_irqsetpolicy(irq, 0, &irq_s->irq_hook)))
ddekit_panic("Failed to attach interrupt (ERROR %d)", err_code);
/* add to IRQ list */
ddekit_irq_lock();
irq_s->next = irqs;
irqs=irq_s;
ddekit_irq_unlock();
DDEBUG_MSG_INFO("Attached to irq %d (hook: %d)", irq, irq_s->irq_hook);
return irq_s->th;
}
/******************************************************************************
* ddekit_interrupt_detach *
*****************************************************************************/
void ddekit_interrupt_detach(int irq)
{
struct ddekit_irq_s *irq_s;
int err_code;
irq_s = find_by_irq(irq);
if (0 != (err_code = sys_irqrmpolicy(&irq_s->irq_hook)))
ddekit_panic("Failed to detach interrupt (ERROR %d)", err_code);
ddekit_thread_terminate(irq_s->th);
ddekit_irq_remove(irq_s);
ddekit_simple_free(irq_s);
DDEBUG_MSG_VERBOSE(" IRQ %d", irq);
}
/******************************************************************************
* ddekit_interrupt_disable *
*****************************************************************************/
void ddekit_interrupt_disable(int irq)
{
struct ddekit_irq_s *irq_s;
irq_s = find_by_irq(irq);
irq_s->enabled=0;
//sys_irqdisable(&irq_s->irq_hook);
DDEBUG_MSG_VERBOSE(" IRQ %d", irq);
}
/******************************************************************************
* ddekit_interrupt_enable *
*****************************************************************************/
void ddekit_interrupt_enable(int irq)
{
struct ddekit_irq_s *irq_s;
irq_s = find_by_irq(irq);
irq_s->enabled=1;
//sys_irqenable(&irq_s->irq_hook);
DDEBUG_MSG_VERBOSE(" IRQ %d", irq);
}
/******************************************************************************
* ddekit_init_irqs *
*****************************************************************************/
void ddekit_init_irqs()
{
ddekit_lock_init(&lock);
}
/******************************************************************************
* DDEKIT internals (src/irq.h) *
*****************************************************************************/
/******************************************************************************
* _ddekit_interrupt_trigger *
*****************************************************************************/
void _ddekit_interrupt_trigger(int irq_id)
{
struct ddekit_irq_s *irq_s;
int err_code;
irq_s = find_by_irq_id(irq_id);
if (irq_s) {
DDEBUG_MSG_VERBOSE("Triggering IRQ %d", irq_s->irq);
ddekit_sem_up(irq_s->sem);
if (0 != (err_code = sys_irqenable(&irq_s->irq_hook)))
ddekit_panic("Failed to enable interrupt "
"(ERROR %d)", err_code);
} else {
DDEBUG_MSG_WARN("no handler for IRQ %d", irq_s->irq);
}
}
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