ARM: sirf: move irq driver to drivers/irqchip

This updates the irqchip drier for prima2 to the current practices by
moving it into drivers/irqchip and integrating it into the irqchip_init
infrastructure. We also now use a linear irq domain as a preparation
for sparse IRQ suport.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 126 insertions, 0 deletions

diff --git a/drivers/irqchip/irq-sirfsoc.c b/drivers/irqchip/irq-sirfsoc.c
new file mode 100644
index 000000000000..69ea44ebcf61
--- /dev/null
+++ b/drivers/irqchip/irq-sirfsoc.c
@@ -0,0 +1,126 @@
+/*
+ * 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                128
+
+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;
+
+        gc = irq_alloc_generic_chip("SIRFINTC", 1, irq_start, base, handle_level_irq);
+        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;
+
+        irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE, IRQ_NOREQUEST, 0);
+}
+
+static asmlinkage void __exception_irq_entry sirfsoc_handle_irq(struct pt_regs *regs)
+{
+        void __iomem *base = sirfsoc_irqdomain->host_data;
+        u32 irqstat, irqnr;
+
+        irqstat = readl_relaxed(base + SIRFSOC_INIT_IRQ_ID);
+        irqnr = irq_find_mapping(sirfsoc_irqdomain, irqstat & 0xff);
+
+        handle_IRQ(irqnr, 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");
+
+        /* using legacy because irqchip_generic does not work with linear */
+        sirfsoc_irqdomain = irq_domain_add_legacy(np, SIRFSOC_NUM_IRQS, 0, 0,
+                                 &irq_domain_simple_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);