Initial import

1 files changed, 128 insertions, 0 deletions

diff --git a/drivers/irqchip/irq-sirfsoc.c b/drivers/irqchip/irq-sirfsoc.c
new file mode 100644
index 000000000..a469355df
--- /dev/null
+++ b/drivers/irqchip/irq-sirfsoc.c
@@ -0,0 +1,128 @@
+/*
+ * interrupt controller support for CSR SiRFprimaII
+ *
+ * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
+ *
+ * Licensed under GPLv2 or later.
+ */
+
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/irqdomain.h>
+#include <linux/syscore_ops.h>
+#include <asm/mach/irq.h>
+#include <asm/exception.h>
+#include "irqchip.h"
+
+#define SIRFSOC_INT_RISC_MASK0          0x0018
+#define SIRFSOC_INT_RISC_MASK1          0x001C
+#define SIRFSOC_INT_RISC_LEVEL0         0x0020
+#define SIRFSOC_INT_RISC_LEVEL1         0x0024
+#define SIRFSOC_INIT_IRQ_ID		0x0038
+
+#define SIRFSOC_NUM_IRQS		64
+
+static struct irq_domain *sirfsoc_irqdomain;
+
+static __init void
+sirfsoc_alloc_gc(void __iomem *base, unsigned int irq_start, unsigned int num)
+{
+	struct irq_chip_generic *gc;
+	struct irq_chip_type *ct;
+	int ret;
+	unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
+	unsigned int set = IRQ_LEVEL;
+
+	ret = irq_alloc_domain_generic_chips(sirfsoc_irqdomain, num, 1, "irq_sirfsoc",
+		handle_level_irq, clr, set, IRQ_GC_INIT_MASK_CACHE);
+
+	gc = irq_get_domain_generic_chip(sirfsoc_irqdomain, irq_start);
+	gc->reg_base = base;
+	ct = gc->chip_types;
+	ct->chip.irq_mask = irq_gc_mask_clr_bit;
+	ct->chip.irq_unmask = irq_gc_mask_set_bit;
+	ct->regs.mask = SIRFSOC_INT_RISC_MASK0;
+}
+
+static void __exception_irq_entry sirfsoc_handle_irq(struct pt_regs *regs)
+{
+	void __iomem *base = sirfsoc_irqdomain->host_data;
+	u32 irqstat;
+
+	irqstat = readl_relaxed(base + SIRFSOC_INIT_IRQ_ID);
+	handle_domain_irq(sirfsoc_irqdomain, irqstat & 0xff, regs);
+}
+
+static int __init sirfsoc_irq_init(struct device_node *np,
+	struct device_node *parent)
+{
+	void __iomem *base = of_iomap(np, 0);
+	if (!base)
+		panic("unable to map intc cpu registers\n");
+
+	sirfsoc_irqdomain = irq_domain_add_linear(np, SIRFSOC_NUM_IRQS,
+		&irq_generic_chip_ops, base);
+
+	sirfsoc_alloc_gc(base, 0, 32);
+	sirfsoc_alloc_gc(base + 4, 32, SIRFSOC_NUM_IRQS - 32);
+
+	writel_relaxed(0, base + SIRFSOC_INT_RISC_LEVEL0);
+	writel_relaxed(0, base + SIRFSOC_INT_RISC_LEVEL1);
+
+	writel_relaxed(0, base + SIRFSOC_INT_RISC_MASK0);
+	writel_relaxed(0, base + SIRFSOC_INT_RISC_MASK1);
+
+	set_handle_irq(sirfsoc_handle_irq);
+
+	return 0;
+}
+IRQCHIP_DECLARE(sirfsoc_intc, "sirf,prima2-intc", sirfsoc_irq_init);
+
+struct sirfsoc_irq_status {
+	u32 mask0;
+	u32 mask1;
+	u32 level0;
+	u32 level1;
+};
+
+static struct sirfsoc_irq_status sirfsoc_irq_st;
+
+static int sirfsoc_irq_suspend(void)
+{
+	void __iomem *base = sirfsoc_irqdomain->host_data;
+
+	sirfsoc_irq_st.mask0 = readl_relaxed(base + SIRFSOC_INT_RISC_MASK0);
+	sirfsoc_irq_st.mask1 = readl_relaxed(base + SIRFSOC_INT_RISC_MASK1);
+	sirfsoc_irq_st.level0 = readl_relaxed(base + SIRFSOC_INT_RISC_LEVEL0);
+	sirfsoc_irq_st.level1 = readl_relaxed(base + SIRFSOC_INT_RISC_LEVEL1);
+
+	return 0;
+}
+
+static void sirfsoc_irq_resume(void)
+{
+	void __iomem *base = sirfsoc_irqdomain->host_data;
+
+	writel_relaxed(sirfsoc_irq_st.mask0, base + SIRFSOC_INT_RISC_MASK0);
+	writel_relaxed(sirfsoc_irq_st.mask1, base + SIRFSOC_INT_RISC_MASK1);
+	writel_relaxed(sirfsoc_irq_st.level0, base + SIRFSOC_INT_RISC_LEVEL0);
+	writel_relaxed(sirfsoc_irq_st.level1, base + SIRFSOC_INT_RISC_LEVEL1);
+}
+
+static struct syscore_ops sirfsoc_irq_syscore_ops = {
+	.suspend	= sirfsoc_irq_suspend,
+	.resume		= sirfsoc_irq_resume,
+};
+
+static int __init sirfsoc_irq_pm_init(void)
+{
+	if (!sirfsoc_irqdomain)
+		return 0;
+
+	register_syscore_ops(&sirfsoc_irq_syscore_ops);
+	return 0;
+}
+device_initcall(sirfsoc_irq_pm_init);