bsps/sparc: Move shared files to bsps

This patch is a part of the BSP source reorganization.

Update #3285.

bsps/sparc/shared/irq/genirq.c

@@ -0,0 +1,243 @@
+/*
+ * Generic interrupt helpers mainly for GRLIB PCI peripherals
+ *
+ * COPYRIGHT (c) 2008.
+ * Cobham Gaisler AB.
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.org/license/LICENSE.
+ */
+
+#include <rtems.h>
+#include <rtems/bspIo.h>
+#include <stdlib.h>
+#include <string.h>
+#include <bsp/genirq.h>
+
+struct genirq_handler_entry {
+	struct genirq_handler_entry	*next;		/* Next ISR entry for this IRQ number */
+	genirq_handler			isr;		/* ISR function called upon IRQ */
+	void				*arg;		/* custom argument to ISR */
+	int				enabled;	/* Inidicates if IRQ is enabled */
+};
+
+struct genirq_irq_entry {
+	struct genirq_handler_entry	*head;
+	struct genirq_stats		stats;
+};
+
+struct genirq_priv {
+	/* Maximum number of interrupt */
+	int				genirq_max;
+	/* IRQ Table index N reflect IRQ number N */
+	struct genirq_irq_entry		genirq_table[1]; /* Length depends on */
+};
+
+genirq_t genirq_init(int number_of_irqs)
+{
+	int size;
+	struct genirq_priv *priv;
+
+	size = sizeof(int) +
+	       number_of_irqs * sizeof(struct genirq_irq_entry);
+
+	priv = (struct genirq_priv *)malloc(size);
+	if ( !priv )
+		return NULL;
+	memset(priv, 0, size);
+	priv->genirq_max = number_of_irqs - 1;
+
+	return priv;
+}
+
+void genirq_destroy(genirq_t d)
+{
+	struct genirq_priv *priv = d;
+	struct genirq_irq_entry *irqentry;
+	struct genirq_handler_entry *isrentry, *tmp;
+	int i;
+
+	/* Free all registered interrupts */
+	for ( i=0; i<priv->genirq_max; i++) {
+		irqentry = &priv->genirq_table[i];
+		isrentry = irqentry->head;
+		while ( isrentry ) {
+			tmp = isrentry;
+			isrentry = isrentry->next;
+			genirq_free_handler(tmp);
+		}
+	}
+
+	free(priv);
+}
+
+int genirq_check(genirq_t d, int irq)
+{
+	struct genirq_priv *priv = d;
+
+	if ( (irq <= 0) || (irq > priv->genirq_max) )
+		return -1;
+	else
+		return 0;
+}
+
+void *genirq_alloc_handler(genirq_handler isr, void *arg)
+{
+	struct genirq_handler_entry *newentry;
+
+	newentry = malloc(sizeof(struct genirq_handler_entry));
+	if ( newentry ) {
+		/* Initialize ISR entry */
+		newentry->isr     = isr;
+		newentry->arg     = arg;
+		newentry->enabled = 0;
+	}
+	return newentry;
+}
+
+int genirq_register(genirq_t d, int irq, void *handler)
+{
+	struct genirq_priv *priv = d;
+	struct genirq_irq_entry *irqentry;
+	struct genirq_handler_entry *isrentry, *newentry = handler;
+
+	if ( genirq_check(d, irq) )
+		return -1;
+
+	/* Insert new ISR entry first into table */
+	irqentry = &priv->genirq_table[irq];
+	isrentry = irqentry->head;
+	irqentry->head = newentry;
+	newentry->next = isrentry;
+
+	if ( isrentry )
+		return 1; /* This is the first handler on this IRQ */
+	return 0;
+}
+
+void *genirq_unregister(genirq_t d, int irq, genirq_handler isr, void *arg)
+{
+	struct genirq_priv *priv = d;
+	struct genirq_irq_entry *irqentry;
+	struct genirq_handler_entry *isrentry, **prev;
+	void *ret;
+
+	if ( genirq_check(d, irq) )
+		return NULL;
+
+	/* Remove isr[arg] from ISR list */
+	irqentry = &priv->genirq_table[irq];
+	ret = NULL;
+
+	prev = &irqentry->head;
+	isrentry = irqentry->head;
+	while ( isrentry ) {
+		if ( (isrentry->arg == arg) && (isrentry->isr == isr) ) {
+			/* Found ISR, remove it from list */
+			if ( isrentry->enabled ) {
+				/* Can not remove enabled ISRs, disable first */
+				ret = NULL;
+				break;
+			}
+			*prev = isrentry->next;
+			ret = isrentry;
+			break;
+		}
+		prev = &isrentry->next;
+		isrentry = isrentry->next;
+	}
+
+	return ret;
+}
+
+/* Enables or Disables ISR handler. Internal function to reduce footprint
+ * of enable/disable functions.
+ *
+ * \param action 1=enable, 0=disable ISR
+ */
+static int genirq_set_active(
+	struct genirq_priv *priv,
+	int irq,
+	genirq_handler isr,
+	void *arg,
+	int action)
+{
+	struct genirq_irq_entry *irqentry;
+	struct genirq_handler_entry *isrentry, *e = NULL;
+	int enabled;
+
+	if ( genirq_check(priv, irq) )
+		return -1;
+
+	/* Find isr[arg] in ISR list */
+	irqentry = &priv->genirq_table[irq];
+	enabled = 0;
+
+	isrentry = irqentry->head;
+	while ( isrentry ) {
+		if ( (isrentry->arg == arg) && (isrentry->isr == isr) ) {
+			/* Found ISR */
+			if ( isrentry->enabled == action ) {
+				/* The ISR is already enabled or disabled 
+				 * depending on request, neccessary actions
+				 * were taken last time the same action was
+				 * requested.
+				 */
+				return 1;
+			}
+			e = isrentry;
+		} else {
+			enabled += isrentry->enabled;
+		}
+		isrentry = isrentry->next;
+	}
+
+	if ( !e )
+		return -1;
+
+	e->enabled = action;
+
+	return enabled;
+}
+
+int genirq_enable(genirq_t d, int irq, genirq_handler isr, void *arg)
+{
+	struct genirq_priv *priv = d;
+	return genirq_set_active(priv, irq, isr, arg, 1);
+}
+
+int genirq_disable(genirq_t d, int irq, genirq_handler isr, void *arg)
+{
+	struct genirq_priv *priv = d;
+	return genirq_set_active(priv, irq, isr, arg, 0);
+}
+
+void genirq_doirq(genirq_t d, int irq)
+{
+	struct genirq_priv *priv = d;
+	struct genirq_irq_entry *irqentry;
+	struct genirq_handler_entry *isrentry;
+	int enabled;
+
+	irqentry = &priv->genirq_table[irq];
+	irqentry->stats.irq_cnt++;
+
+	enabled = 0;
+
+	isrentry = irqentry->head;
+	while ( isrentry ) {
+		if ( isrentry->enabled ) {
+			enabled = 1;
+			/* Call the ISR */
+			isrentry->isr(isrentry->arg);
+		}
+		isrentry = isrentry->next;
+	}
+
+	/* Was the IRQ an IRQ without source? */
+	if ( enabled == 0 ) {
+		/* This should not happen */
+		printk("Spurious IRQ happened on IRQ %d\n", irq);
+	}
+}