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-rw-r--r--arch/mips/alchemy/pb1200/irqmap.c160
1 files changed, 160 insertions, 0 deletions
diff --git a/arch/mips/alchemy/pb1200/irqmap.c b/arch/mips/alchemy/pb1200/irqmap.c
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+++ b/arch/mips/alchemy/pb1200/irqmap.c
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+/*
+ * BRIEF MODULE DESCRIPTION
+ * Au1xxx irq map table
+ *
+ * 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
+ * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * 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.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/init.h>
+#include <linux/interrupt.h>
+
+#include <asm/mach-au1x00/au1000.h>
+
+#ifdef CONFIG_MIPS_PB1200
+#include <asm/mach-pb1x00/pb1200.h>
+#endif
+
+#ifdef CONFIG_MIPS_DB1200
+#include <asm/mach-db1x00/db1200.h>
+#define PB1200_INT_BEGIN DB1200_INT_BEGIN
+#define PB1200_INT_END DB1200_INT_END
+#endif
+
+struct au1xxx_irqmap __initdata au1xxx_irq_map[] = {
+ /* This is external interrupt cascade */
+ { AU1000_GPIO_7, INTC_INT_LOW_LEVEL, 0 },
+};
+
+int __initdata au1xxx_nr_irqs = ARRAY_SIZE(au1xxx_irq_map);
+
+/*
+ * Support for External interrupts on the Pb1200 Development platform.
+ */
+static volatile int pb1200_cascade_en;
+
+irqreturn_t pb1200_cascade_handler(int irq, void *dev_id)
+{
+ unsigned short bisr = bcsr->int_status;
+ int extirq_nr = 0;
+
+ /* Clear all the edge interrupts. This has no effect on level. */
+ bcsr->int_status = bisr;
+ for ( ; bisr; bisr &= bisr - 1) {
+ extirq_nr = PB1200_INT_BEGIN + __ffs(bisr);
+ /* Ack and dispatch IRQ */
+ do_IRQ(extirq_nr);
+ }
+
+ return IRQ_RETVAL(1);
+}
+
+inline void pb1200_enable_irq(unsigned int irq_nr)
+{
+ bcsr->intset_mask = 1 << (irq_nr - PB1200_INT_BEGIN);
+ bcsr->intset = 1 << (irq_nr - PB1200_INT_BEGIN);
+}
+
+inline void pb1200_disable_irq(unsigned int irq_nr)
+{
+ bcsr->intclr_mask = 1 << (irq_nr - PB1200_INT_BEGIN);
+ bcsr->intclr = 1 << (irq_nr - PB1200_INT_BEGIN);
+}
+
+static unsigned int pb1200_setup_cascade(void)
+{
+ return request_irq(AU1000_GPIO_7, &pb1200_cascade_handler,
+ 0, "Pb1200 Cascade", &pb1200_cascade_handler);
+}
+
+static unsigned int pb1200_startup_irq(unsigned int irq)
+{
+ if (++pb1200_cascade_en == 1) {
+ int res;
+
+ res = pb1200_setup_cascade();
+ if (res)
+ return res;
+ }
+
+ pb1200_enable_irq(irq);
+
+ return 0;
+}
+
+static void pb1200_shutdown_irq(unsigned int irq)
+{
+ pb1200_disable_irq(irq);
+ if (--pb1200_cascade_en == 0)
+ free_irq(AU1000_GPIO_7, &pb1200_cascade_handler);
+}
+
+static struct irq_chip external_irq_type = {
+#ifdef CONFIG_MIPS_PB1200
+ .name = "Pb1200 Ext",
+#endif
+#ifdef CONFIG_MIPS_DB1200
+ .name = "Db1200 Ext",
+#endif
+ .startup = pb1200_startup_irq,
+ .shutdown = pb1200_shutdown_irq,
+ .ack = pb1200_disable_irq,
+ .mask = pb1200_disable_irq,
+ .mask_ack = pb1200_disable_irq,
+ .unmask = pb1200_enable_irq,
+};
+
+void _board_init_irq(void)
+{
+ unsigned int irq;
+
+#ifdef CONFIG_MIPS_PB1200
+ /* We have a problem with CPLD rev 3. */
+ if (((bcsr->whoami & BCSR_WHOAMI_CPLD) >> 4) <= 3) {
+ printk(KERN_ERR "WARNING!!!\n");
+ printk(KERN_ERR "WARNING!!!\n");
+ printk(KERN_ERR "WARNING!!!\n");
+ printk(KERN_ERR "WARNING!!!\n");
+ printk(KERN_ERR "WARNING!!!\n");
+ printk(KERN_ERR "WARNING!!!\n");
+ printk(KERN_ERR "Pb1200 must be at CPLD rev 4. Please have Pb1200\n");
+ printk(KERN_ERR "updated to latest revision. This software will\n");
+ printk(KERN_ERR "not work on anything less than CPLD rev 4.\n");
+ printk(KERN_ERR "WARNING!!!\n");
+ printk(KERN_ERR "WARNING!!!\n");
+ printk(KERN_ERR "WARNING!!!\n");
+ printk(KERN_ERR "WARNING!!!\n");
+ printk(KERN_ERR "WARNING!!!\n");
+ printk(KERN_ERR "WARNING!!!\n");
+ panic("Game over. Your score is 0.");
+ }
+#endif
+
+ for (irq = PB1200_INT_BEGIN; irq <= PB1200_INT_END; irq++) {
+ set_irq_chip_and_handler(irq, &external_irq_type,
+ handle_level_irq);
+ pb1200_disable_irq(irq);
+ }
+
+ /*
+ * GPIO_7 can not be hooked here, so it is hooked upon first
+ * request of any source attached to the cascade.
+ */
+}