Add preliminary RouterBoard RB1xx support

[openwrt/svn-archive/archive.git] / target / linux / rb1xx-2.6 / files / arch / mips / adm5120 / irq.c

diff --git a/target/linux/rb1xx-2.6/files/arch/mips/adm5120/irq.c b/target/linux/rb1xx-2.6/files/arch/mips/adm5120/irq.c
new file mode 100644 (file)
index 0000000..46f3bb0
--- /dev/null
+++ b/target/linux/rb1xx-2.6/files/arch/mips/adm5120/irq.c
@@ -0,0 +1,156 @@
+/*
+ *     Copyright (C) ADMtek Incorporated.
+ *             Creator : daniell@admtek.com.tw
+ *     Carsten Langgaard, carstenl@mips.com
+ *     Copyright (C) 2000, 2001 MIPS Technologies, Inc.
+ *     Copyright (C) 2001 Ralf Baechle
+ *     Copyright (C) 2005 Jeroen Vreeken (pe1rxq@amsat.org)
+ */
+
+#include <linux/autoconf.h>
+#include <linux/init.h>
+#include <linux/kernel_stat.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/random.h>
+#include <linux/pm.h>
+
+#include <asm/irq.h>
+#include <asm/time.h>
+#include <asm/mipsregs.h>
+#include <asm/gdb-stub.h>
+#include <asm/irq_cpu.h>
+
+#define MIPS_CPU_TIMER_IRQ 7
+
+extern int setup_irq(unsigned int irq, struct irqaction *irqaction);
+extern irq_desc_t irq_desc[];
+extern asmlinkage void mipsIRQ(void);
+
+int mips_int_lock(void);
+void mips_int_unlock(int);
+
+unsigned int mips_counter_frequency;
+
+#define ADM5120_INTC_REG(reg)  (*(volatile u32 *)(KSEG1ADDR(0x12200000+(reg))))
+#define ADM5120_INTC_STATUS    ADM5120_INTC_REG(0x00)
+#define ADM5120_INTC_ENABLE    ADM5120_INTC_REG(0x08)
+#define ADM5120_INTC_DISABLE   ADM5120_INTC_REG(0x0c)
+#define ADM5120_IRQ_MAX                9
+#define ADM5120_IRQ_MASK       0x3ff
+
+void adm5120_hw0_irqdispatch(struct pt_regs *regs)
+{
+       unsigned long intsrc;
+       int i;
+
+       intsrc = ADM5120_INTC_STATUS & ADM5120_IRQ_MASK;
+
+       for (i = 0; intsrc; intsrc >>= 1, i++)
+               if (intsrc & 0x1)
+                       do_IRQ(i);
+               else
+                       spurious_interrupt();
+}
+
+void mips_timer_interrupt(struct pt_regs *regs)
+{
+        write_c0_compare(read_c0_count()+ mips_counter_frequency/HZ);
+        ll_timer_interrupt(MIPS_CPU_TIMER_IRQ);
+}
+
+/* Main interrupt dispatcher */
+asmlinkage void plat_irq_dispatch(struct pt_regs *regs)
+{
+        unsigned int cp0_cause = read_c0_cause() & read_c0_status();
+
+        if (cp0_cause & CAUSEF_IP7) {
+                mips_timer_interrupt( regs);
+        } else if (cp0_cause & CAUSEF_IP2) {
+                adm5120_hw0_irqdispatch( regs);
+        }
+}
+
+void enable_adm5120_irq(unsigned int irq)
+{
+       int s;
+
+       /* Disable all interrupts (FIQ/IRQ) */
+       s = mips_int_lock();
+
+       if ((irq < 0) || (irq > ADM5120_IRQ_MAX)) 
+               goto err_exit;
+
+       ADM5120_INTC_ENABLE = (1<<irq);
+
+err_exit:
+
+       /* Restore the interrupts states */
+       mips_int_unlock(s);
+}
+
+
+void disable_adm5120_irq(unsigned int irq)
+{
+       int s;
+
+       /* Disable all interrupts (FIQ/IRQ) */
+       s = mips_int_lock();
+
+       if ((irq < 0) || (irq > ADM5120_IRQ_MAX)) 
+               goto err_exit;
+
+       ADM5120_INTC_DISABLE = (1<<irq);
+
+err_exit:
+       /* Restore the interrupts states */
+       mips_int_unlock(s);
+}
+
+unsigned int startup_adm5120_irq(unsigned int irq)
+{
+       enable_adm5120_irq(irq);
+       return 0;
+}
+
+void shutdown_adm5120_irq(unsigned int irq)
+{
+       disable_adm5120_irq(irq);
+}
+
+static inline void ack_adm5120_irq(unsigned int irq_nr)
+{
+       ADM5120_INTC_DISABLE = (1 << irq_nr);
+}
+
+
+static void end_adm5120_irq(unsigned int irq_nr)
+{
+       ADM5120_INTC_ENABLE = (1 << irq_nr);
+}
+
+static hw_irq_controller adm5120_irq_type = {
+       .typename       = "MIPS",
+       .startup        = startup_adm5120_irq,
+       .shutdown       = shutdown_adm5120_irq,
+       .enable         = enable_adm5120_irq,
+       .disable        = disable_adm5120_irq,
+       .ack            = ack_adm5120_irq,
+       .end            = end_adm5120_irq,
+       .set_affinity   = NULL,
+};
+
+
+void __init arch_init_irq(void)
+{
+       int i;
+       
+       for (i = 0; i <= ADM5120_IRQ_MAX; i++) {
+               irq_desc[i].status = IRQ_DISABLED;
+               irq_desc[i].action = 0;
+               irq_desc[i].depth = 1;
+               irq_desc[i].chip = &adm5120_irq_type;
+       }
+}