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-rw-r--r--arch/mips/kernel/irq-gt641xx.c118
1 files changed, 118 insertions, 0 deletions
diff --git a/arch/mips/kernel/irq-gt641xx.c b/arch/mips/kernel/irq-gt641xx.c
new file mode 100644
index 000000000..93bcf5736
--- /dev/null
+++ b/arch/mips/kernel/irq-gt641xx.c
@@ -0,0 +1,118 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * GT641xx IRQ routines.
+ *
+ * Copyright (C) 2007 Yoichi Yuasa <yuasa@linux-mips.org>
+ */
+#include <linux/hardirq.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+
+#include <asm/gt64120.h>
+
+#define GT641XX_IRQ_TO_BIT(irq) (1U << (irq - GT641XX_IRQ_BASE))
+
+static DEFINE_RAW_SPINLOCK(gt641xx_irq_lock);
+
+static void ack_gt641xx_irq(struct irq_data *d)
+{
+ unsigned long flags;
+ u32 cause;
+
+ raw_spin_lock_irqsave(&gt641xx_irq_lock, flags);
+ cause = GT_READ(GT_INTRCAUSE_OFS);
+ cause &= ~GT641XX_IRQ_TO_BIT(d->irq);
+ GT_WRITE(GT_INTRCAUSE_OFS, cause);
+ raw_spin_unlock_irqrestore(&gt641xx_irq_lock, flags);
+}
+
+static void mask_gt641xx_irq(struct irq_data *d)
+{
+ unsigned long flags;
+ u32 mask;
+
+ raw_spin_lock_irqsave(&gt641xx_irq_lock, flags);
+ mask = GT_READ(GT_INTRMASK_OFS);
+ mask &= ~GT641XX_IRQ_TO_BIT(d->irq);
+ GT_WRITE(GT_INTRMASK_OFS, mask);
+ raw_spin_unlock_irqrestore(&gt641xx_irq_lock, flags);
+}
+
+static void mask_ack_gt641xx_irq(struct irq_data *d)
+{
+ unsigned long flags;
+ u32 cause, mask;
+
+ raw_spin_lock_irqsave(&gt641xx_irq_lock, flags);
+ mask = GT_READ(GT_INTRMASK_OFS);
+ mask &= ~GT641XX_IRQ_TO_BIT(d->irq);
+ GT_WRITE(GT_INTRMASK_OFS, mask);
+
+ cause = GT_READ(GT_INTRCAUSE_OFS);
+ cause &= ~GT641XX_IRQ_TO_BIT(d->irq);
+ GT_WRITE(GT_INTRCAUSE_OFS, cause);
+ raw_spin_unlock_irqrestore(&gt641xx_irq_lock, flags);
+}
+
+static void unmask_gt641xx_irq(struct irq_data *d)
+{
+ unsigned long flags;
+ u32 mask;
+
+ raw_spin_lock_irqsave(&gt641xx_irq_lock, flags);
+ mask = GT_READ(GT_INTRMASK_OFS);
+ mask |= GT641XX_IRQ_TO_BIT(d->irq);
+ GT_WRITE(GT_INTRMASK_OFS, mask);
+ raw_spin_unlock_irqrestore(&gt641xx_irq_lock, flags);
+}
+
+static struct irq_chip gt641xx_irq_chip = {
+ .name = "GT641xx",
+ .irq_ack = ack_gt641xx_irq,
+ .irq_mask = mask_gt641xx_irq,
+ .irq_mask_ack = mask_ack_gt641xx_irq,
+ .irq_unmask = unmask_gt641xx_irq,
+};
+
+void gt641xx_irq_dispatch(void)
+{
+ u32 cause, mask;
+ int i;
+
+ cause = GT_READ(GT_INTRCAUSE_OFS);
+ mask = GT_READ(GT_INTRMASK_OFS);
+ cause &= mask;
+
+ /*
+ * bit0 : logical or of all the interrupt bits.
+ * bit30: logical or of bits[29:26,20:1].
+ * bit31: logical or of bits[25:1].
+ */
+ for (i = 1; i < 30; i++) {
+ if (cause & (1U << i)) {
+ do_IRQ(GT641XX_IRQ_BASE + i);
+ return;
+ }
+ }
+
+ atomic_inc(&irq_err_count);
+}
+
+void __init gt641xx_irq_init(void)
+{
+ int i;
+
+ GT_WRITE(GT_INTRMASK_OFS, 0);
+ GT_WRITE(GT_INTRCAUSE_OFS, 0);
+
+ /*
+ * bit0 : logical or of all the interrupt bits.
+ * bit30: logical or of bits[29:26,20:1].
+ * bit31: logical or of bits[25:1].
+ */
+ for (i = 1; i < 30; i++)
+ irq_set_chip_and_handler(GT641XX_IRQ_BASE + i,
+ &gt641xx_irq_chip, handle_level_irq);
+}