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-rw-r--r--arch/sparc/cpu/leon3/interrupts.c219
1 files changed, 219 insertions, 0 deletions
diff --git a/arch/sparc/cpu/leon3/interrupts.c b/arch/sparc/cpu/leon3/interrupts.c
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+++ b/arch/sparc/cpu/leon3/interrupts.c
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+/*
+ * (C) Copyright 2007
+ * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com
+ *
+ * (C) Copyright 2006
+ * Detlev Zundel, DENX Software Engineering, dzu@denx.de
+ *
+ * (C) Copyright -2003
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2001
+ * Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <asm/stack.h>
+#include <common.h>
+#include <asm/io.h>
+#include <asm/processor.h>
+#include <command.h>
+#include <asm/irq.h>
+
+#include <asm/leon.h>
+#include <ambapp.h>
+
+/* 15 normal irqs and a non maskable interrupt */
+#define NR_IRQS 15
+
+struct irq_action {
+ interrupt_handler_t *handler;
+ void *arg;
+ unsigned int count;
+};
+
+extern ambapp_dev_irqmp *irqmp;
+extern ambapp_dev_gptimer *gptimer;
+
+static struct irq_action irq_handlers[NR_IRQS] = { {0}, };
+static int spurious_irq_cnt = 0;
+static int spurious_irq = 0;
+
+static inline unsigned int irqmp_get_irqmask(unsigned int irq)
+{
+ if ((irq < 0) || (irq >= NR_IRQS)) {
+ return 0;
+ } else {
+ return (1 << irq);
+ }
+
+}
+
+static void leon3_ic_disable(unsigned int irq)
+{
+ unsigned int mask, pil;
+ if (!irqmp)
+ return;
+
+ pil = intLock();
+
+ /* get mask of interrupt */
+ mask = irqmp_get_irqmask(irq);
+
+ /* set int level */
+ irqmp->cpu_mask[0] = SPARC_NOCACHE_READ(&irqmp->cpu_mask[0]) & (~mask);
+
+ intUnlock(pil);
+}
+
+static void leon3_ic_enable(unsigned int irq)
+{
+ unsigned int mask, pil;
+ if (!irqmp)
+ return;
+
+ pil = intLock();
+
+ /* get mask of interrupt */
+ mask = irqmp_get_irqmask(irq);
+
+ /* set int level */
+ irqmp->cpu_mask[0] = SPARC_NOCACHE_READ(&irqmp->cpu_mask[0]) | mask;
+
+ intUnlock(pil);
+
+}
+
+void handler_irq(int irq, struct pt_regs *regs)
+{
+ if (irq_handlers[irq].handler) {
+ if (((unsigned int)irq_handlers[irq].handler > CONFIG_SYS_RAM_END) ||
+ ((unsigned int)irq_handlers[irq].handler < CONFIG_SYS_RAM_BASE)
+ ) {
+ printf("handler_irq: bad handler: %x, irq number %d\n",
+ (unsigned int)irq_handlers[irq].handler, irq);
+ return;
+ }
+ irq_handlers[irq].handler(irq_handlers[irq].arg);
+ irq_handlers[irq].count++;
+ } else {
+ spurious_irq_cnt++;
+ spurious_irq = irq;
+ }
+}
+
+void leon3_force_int(int irq)
+{
+ if (!irqmp || (irq >= NR_IRQS) || (irq < 0))
+ return;
+ printf("Forcing interrupt %d\n", irq);
+
+ irqmp->iforce = SPARC_NOCACHE_READ(&irqmp->iforce) | (1 << irq);
+}
+
+/****************************************************************************/
+
+int interrupt_init_cpu(void)
+{
+
+ return (0);
+}
+
+/****************************************************************************/
+
+/* Handle Timer 0 IRQ */
+void timer_interrupt_cpu(void *arg)
+{
+ gptimer->e[0].ctrl = (LEON3_GPTIMER_EN |
+ LEON3_GPTIMER_RL |
+ LEON3_GPTIMER_LD | LEON3_GPTIMER_IRQEN);
+ /* nothing to do here */
+ return;
+}
+
+/****************************************************************************/
+
+/*
+ * Install and free a interrupt handler.
+ */
+
+void irq_install_handler(int irq, interrupt_handler_t * handler, void *arg)
+{
+ if (irq < 0 || irq >= NR_IRQS) {
+ printf("irq_install_handler: bad irq number %d\n", irq);
+ return;
+ }
+
+ if (irq_handlers[irq].handler != NULL)
+ printf("irq_install_handler: 0x%08lx replacing 0x%08lx\n",
+ (ulong) handler, (ulong) irq_handlers[irq].handler);
+
+ if (((unsigned int)handler > CONFIG_SYS_RAM_END) ||
+ ((unsigned int)handler < CONFIG_SYS_RAM_BASE)
+ ) {
+ printf("irq_install_handler: bad handler: %x, irq number %d\n",
+ (unsigned int)handler, irq);
+ return;
+ }
+ irq_handlers[irq].handler = handler;
+ irq_handlers[irq].arg = arg;
+
+ /* enable irq on IRQMP hardware */
+ leon3_ic_enable(irq);
+
+}
+
+void irq_free_handler(int irq)
+{
+ if (irq < 0 || irq >= NR_IRQS) {
+ printf("irq_free_handler: bad irq number %d\n", irq);
+ return;
+ }
+
+ /* disable irq on IRQMP hardware */
+ leon3_ic_disable(irq);
+
+ irq_handlers[irq].handler = NULL;
+ irq_handlers[irq].arg = NULL;
+}
+
+/****************************************************************************/
+
+#if defined(CONFIG_CMD_IRQ)
+void do_irqinfo(cmd_tbl_t * cmdtp, bd_t * bd, int flag, int argc, char * const argv[])
+{
+ int irq;
+ unsigned int pil = get_pil();
+ printf("PIL level: %u\n\r", pil);
+ printf("Spurious IRQ: %u, last unknown IRQ: %d\n",
+ spurious_irq_cnt, spurious_irq);
+
+ puts("\nInterrupt-Information:\n" "Nr Routine Arg Count\n");
+
+ for (irq = 0; irq < NR_IRQS; irq++) {
+ if (irq_handlers[irq].handler != NULL) {
+ printf("%02d %p %p %d\n", irq,
+ irq_handlers[irq].handler,
+ irq_handlers[irq].arg,
+ irq_handlers[irq].count);
+ }
+ }
+}
+#endif
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