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>

5 files changed, 129 insertions, 138 deletions

diff --git a/arch/arm/mach-prima2/Makefile b/arch/arm/mach-prima2/Makefile
index bfe360c..5fdff7e 100644
--- a/arch/arm/mach-prima2/Makefile
+++ b/arch/arm/mach-prima2/Makefile
@@ -4,7 +4,6 @@ obj-y += rtciobrg.o
 obj-$(CONFIG_DEBUG_LL) += lluart.o
 obj-$(CONFIG_CACHE_L2X0) += l2x0.o
 obj-$(CONFIG_SUSPEND) += pm.o sleep.o
-obj-$(CONFIG_SIRF_IRQ) += irq.o
 obj-$(CONFIG_SMP) += platsmp.o headsmp.o
 obj-$(CONFIG_HOTPLUG_CPU)  += hotplug.o
 obj-$(CONFIG_ARCH_PRIMA2) += timer-prima2.o
diff --git a/arch/arm/mach-prima2/common.c b/arch/arm/mach-prima2/common.c
index 72efb4f..15c14df 100644
--- a/arch/arm/mach-prima2/common.c
+++ b/arch/arm/mach-prima2/common.c
@@ -46,11 +46,8 @@ static const char *atlas6_dt_match[] __initdata = {
 DT_MACHINE_START(ATLAS6_DT, "Generic ATLAS6 (Flattened Device Tree)")
 	/* Maintainer: Barry Song <baohua.song@csr.com> */
 	.map_io         = sirfsoc_map_io,
-	.init_irq	= sirfsoc_of_irq_init,
+	.init_irq	= irqchip_init,
 	.init_time	= sirfsoc_prima2_timer_init,
-#ifdef CONFIG_MULTI_IRQ_HANDLER
-	.handle_irq     = sirfsoc_handle_irq,
-#endif
 	.init_machine	= sirfsoc_mach_init,
 	.init_late	= sirfsoc_init_late,
 	.dt_compat      = atlas6_dt_match,
@@ -67,11 +64,8 @@ static const char *prima2_dt_match[] __initdata = {
 DT_MACHINE_START(PRIMA2_DT, "Generic PRIMA2 (Flattened Device Tree)")
 	/* Maintainer: Barry Song <baohua.song@csr.com> */
 	.map_io         = sirfsoc_map_io,
-	.init_irq	= sirfsoc_of_irq_init,
+	.init_irq	= irqchip_init,
 	.init_time	= sirfsoc_prima2_timer_init,
-#ifdef CONFIG_MULTI_IRQ_HANDLER
-	.handle_irq     = sirfsoc_handle_irq,
-#endif
 	.dma_zone_size	= SZ_256M,
 	.init_machine	= sirfsoc_mach_init,
 	.init_late	= sirfsoc_init_late,
diff --git a/arch/arm/mach-prima2/irq.c b/arch/arm/mach-prima2/irq.c
deleted file mode 100644
index 6c0f3e9..0000000
--- a/arch/arm/mach-prima2/irq.c
+++ /dev/null
@@ -1,129 +0,0 @@
-/*
- * 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 <mach/hardware.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
-
-void __iomem *sirfsoc_intc_base;
-
-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 __init void sirfsoc_irq_init(void)
-{
-	sirfsoc_alloc_gc(sirfsoc_intc_base, 0, 32);
-	sirfsoc_alloc_gc(sirfsoc_intc_base + 4, 32,
-			SIRFSOC_INTENAL_IRQ_END + 1 - 32);
-
-	writel_relaxed(0, sirfsoc_intc_base + SIRFSOC_INT_RISC_LEVEL0);
-	writel_relaxed(0, sirfsoc_intc_base + SIRFSOC_INT_RISC_LEVEL1);
-
-	writel_relaxed(0, sirfsoc_intc_base + SIRFSOC_INT_RISC_MASK0);
-	writel_relaxed(0, sirfsoc_intc_base + SIRFSOC_INT_RISC_MASK1);
-}
-
-asmlinkage void __exception_irq_entry sirfsoc_handle_irq(struct pt_regs *regs)
-{
-	u32 irqstat, irqnr;
-
-	irqstat = readl_relaxed(sirfsoc_intc_base + SIRFSOC_INIT_IRQ_ID);
-	irqnr = irqstat & 0xff;
-
-	handle_IRQ(irqnr, regs);
-}
-
-static struct of_device_id intc_ids[]  = {
-	{ .compatible = "sirf,prima2-intc" },
-	{},
-};
-
-void __init sirfsoc_of_irq_init(void)
-{
-	struct device_node *np;
-
-	np = of_find_matching_node(NULL, intc_ids);
-	if (!np)
-		return;
-
-	sirfsoc_intc_base = of_iomap(np, 0);
-	if (!sirfsoc_intc_base)
-		panic("unable to map intc cpu registers\n");
-
-	irq_domain_add_legacy(np, SIRFSOC_INTENAL_IRQ_END + 1, 0, 0,
-		&irq_domain_simple_ops, NULL);
-
-	of_node_put(np);
-
-	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)
-{
-	sirfsoc_irq_st.mask0 = readl_relaxed(sirfsoc_intc_base + SIRFSOC_INT_RISC_MASK0);
-	sirfsoc_irq_st.mask1 = readl_relaxed(sirfsoc_intc_base + SIRFSOC_INT_RISC_MASK1);
-	sirfsoc_irq_st.level0 = readl_relaxed(sirfsoc_intc_base + SIRFSOC_INT_RISC_LEVEL0);
-	sirfsoc_irq_st.level1 = readl_relaxed(sirfsoc_intc_base + SIRFSOC_INT_RISC_LEVEL1);
-
-	return 0;
-}
-
-static void sirfsoc_irq_resume(void)
-{
-	writel_relaxed(sirfsoc_irq_st.mask0, sirfsoc_intc_base + SIRFSOC_INT_RISC_MASK0);
-	writel_relaxed(sirfsoc_irq_st.mask1, sirfsoc_intc_base + SIRFSOC_INT_RISC_MASK1);
-	writel_relaxed(sirfsoc_irq_st.level0, sirfsoc_intc_base + SIRFSOC_INT_RISC_LEVEL0);
-	writel_relaxed(sirfsoc_irq_st.level1, sirfsoc_intc_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)
-{
-	register_syscore_ops(&sirfsoc_irq_syscore_ops);
-	return 0;
-}
-device_initcall(sirfsoc_irq_pm_init);
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index 98e3b87..5cb6bd24 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -8,4 +8,5 @@ obj-$(CONFIG_ARCH_SUNXI)		+= irq-sunxi.o
 obj-$(CONFIG_ARCH_SPEAR3XX)		+= spear-shirq.o
 obj-$(CONFIG_ARM_GIC)			+= irq-gic.o
 obj-$(CONFIG_ARM_VIC)			+= irq-vic.o
+obj-$(CONFIG_SIRF_IRQ)			+= irq-sirfsoc.o
 obj-$(CONFIG_VERSATILE_FPGA_IRQ)	+= irq-versatile-fpga.o
diff --git a/drivers/irqchip/irq-sirfsoc.c b/drivers/irqchip/irq-sirfsoc.c
new file mode 100644
index 0000000..69ea44e
--- /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);