Initial import

1 files changed, 162 insertions, 0 deletions

diff --git a/arch/mips/jazz/irq.c b/arch/mips/jazz/irq.c
new file mode 100644
index 000000000..e1ea4f625
--- /dev/null
+++ b/arch/mips/jazz/irq.c
@@ -0,0 +1,162 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1992 Linus Torvalds
+ * Copyright (C) 1994 - 2001, 2003, 07 Ralf Baechle
+ */
+#include <linux/clockchips.h>
+#include <linux/i8253.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/smp.h>
+#include <linux/spinlock.h>
+#include <linux/irq.h>
+
+#include <asm/irq_cpu.h>
+#include <asm/i8259.h>
+#include <asm/io.h>
+#include <asm/jazz.h>
+#include <asm/pgtable.h>
+#include <asm/tlbmisc.h>
+
+static DEFINE_RAW_SPINLOCK(r4030_lock);
+
+static void enable_r4030_irq(struct irq_data *d)
+{
+	unsigned int mask = 1 << (d->irq - JAZZ_IRQ_START);
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&r4030_lock, flags);
+	mask |= r4030_read_reg16(JAZZ_IO_IRQ_ENABLE);
+	r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, mask);
+	raw_spin_unlock_irqrestore(&r4030_lock, flags);
+}
+
+void disable_r4030_irq(struct irq_data *d)
+{
+	unsigned int mask = ~(1 << (d->irq - JAZZ_IRQ_START));
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&r4030_lock, flags);
+	mask &= r4030_read_reg16(JAZZ_IO_IRQ_ENABLE);
+	r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, mask);
+	raw_spin_unlock_irqrestore(&r4030_lock, flags);
+}
+
+static struct irq_chip r4030_irq_type = {
+	.name = "R4030",
+	.irq_mask = disable_r4030_irq,
+	.irq_unmask = enable_r4030_irq,
+};
+
+void __init init_r4030_ints(void)
+{
+	int i;
+
+	for (i = JAZZ_IRQ_START; i <= JAZZ_IRQ_END; i++)
+		irq_set_chip_and_handler(i, &r4030_irq_type, handle_level_irq);
+
+	r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, 0);
+	r4030_read_reg16(JAZZ_IO_IRQ_SOURCE);		/* clear pending IRQs */
+	r4030_read_reg32(JAZZ_R4030_INVAL_ADDR);	/* clear error bits */
+}
+
+/*
+ * On systems with i8259-style interrupt controllers we assume for
+ * driver compatibility reasons interrupts 0 - 15 to be the i8259
+ * interrupts even if the hardware uses a different interrupt numbering.
+ */
+void __init arch_init_irq(void)
+{
+	/*
+	 * this is a hack to get back the still needed wired mapping
+	 * killed by init_mm()
+	 */
+
+	/* Map 0xe0000000 -> 0x0:800005C0, 0xe0010000 -> 0x1:30000580 */
+	add_wired_entry(0x02000017, 0x03c00017, 0xe0000000, PM_64K);
+	/* Map 0xe2000000 -> 0x0:900005C0, 0xe3010000 -> 0x0:910005C0 */
+	add_wired_entry(0x02400017, 0x02440017, 0xe2000000, PM_16M);
+	/* Map 0xe4000000 -> 0x0:600005C0, 0xe4100000 -> 400005C0 */
+	add_wired_entry(0x01800017, 0x01000017, 0xe4000000, PM_4M);
+
+	init_i8259_irqs();			/* Integrated i8259  */
+	mips_cpu_irq_init();
+	init_r4030_ints();
+
+	change_c0_status(ST0_IM, IE_IRQ2 | IE_IRQ1);
+}
+
+asmlinkage void plat_irq_dispatch(void)
+{
+	unsigned int pending = read_c0_cause() & read_c0_status();
+	unsigned int irq;
+
+	if (pending & IE_IRQ4) {
+		r4030_read_reg32(JAZZ_TIMER_REGISTER);
+		do_IRQ(JAZZ_TIMER_IRQ);
+	} else if (pending & IE_IRQ2) {
+		irq = *(volatile u8 *)JAZZ_EISA_IRQ_ACK;
+		do_IRQ(irq);
+	} else if (pending & IE_IRQ1) {
+		irq = *(volatile u8 *)JAZZ_IO_IRQ_SOURCE >> 2;
+		if (likely(irq > 0))
+			do_IRQ(irq + JAZZ_IRQ_START - 1);
+		else
+			panic("Unimplemented loc_no_irq handler");
+	}
+}
+
+static void r4030_set_mode(enum clock_event_mode mode,
+			   struct clock_event_device *evt)
+{
+	/* Nothing to do ...  */
+}
+
+struct clock_event_device r4030_clockevent = {
+	.name		= "r4030",
+	.features	= CLOCK_EVT_FEAT_PERIODIC,
+	.rating		= 300,
+	.irq		= JAZZ_TIMER_IRQ,
+	.set_mode	= r4030_set_mode,
+};
+
+static irqreturn_t r4030_timer_interrupt(int irq, void *dev_id)
+{
+	struct clock_event_device *cd = dev_id;
+
+	cd->event_handler(cd);
+	return IRQ_HANDLED;
+}
+
+static struct irqaction r4030_timer_irqaction = {
+	.handler	= r4030_timer_interrupt,
+	.flags		= IRQF_TIMER,
+	.name		= "R4030 timer",
+};
+
+void __init plat_time_init(void)
+{
+	struct clock_event_device *cd = &r4030_clockevent;
+	struct irqaction *action = &r4030_timer_irqaction;
+	unsigned int cpu = smp_processor_id();
+
+	BUG_ON(HZ != 100);
+
+	cd->cpumask		= cpumask_of(cpu);
+	clockevents_register_device(cd);
+	action->dev_id = cd;
+	setup_irq(JAZZ_TIMER_IRQ, action);
+
+	/*
+	 * Set clock to 100Hz.
+	 *
+	 * The R4030 timer receives an input clock of 1kHz which is divieded by
+	 * a programmable 4-bit divider.  This makes it fairly inflexible.
+	 */
+	r4030_write_reg32(JAZZ_TIMER_INTERVAL, 9);
+	setup_pit_timer();
+}