Merge tag 'integrator-irq' of git://git.kernel.org/pub/scm/linux/kern…

…el/git/linusw/linux-integrator into next/soc

From Linus Walleij:

This provides the following Integrator refactorings:
- Switch the FPGA IRQ controller to use the simple IRQ domain
- Get rid of preallocated IRQ descriptors on the Integrator
- Move the FPGA IRQ driver to drivers/irqchip

* tag 'integrator-irq' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-integrator:
  ARM: plat-versatile: move FPGA irq driver to drivers/irqchip
  ARM: integrator: get rid of preallocated irq descriptors
  ARM: plat-versatile: use simple irqdomain for FPGA IRQ

arch/arm/Kconfig

@@ -284,8 +284,8 @@ config ARCH_INTEGRATOR
 	select MULTI_IRQ_HANDLER
 	select NEED_MACH_MEMORY_H
 	select PLAT_VERSATILE
-	select PLAT_VERSATILE_FPGA_IRQ
 	select SPARSE_IRQ
+	select VERSATILE_FPGA_IRQ
 	help
 	  Support for ARM's Integrator platform.
 
@@ -318,7 +318,7 @@ config ARCH_VERSATILE
 	select PLAT_VERSATILE
 	select PLAT_VERSATILE_CLCD
 	select PLAT_VERSATILE_CLOCK
-	select PLAT_VERSATILE_FPGA_IRQ
+	select VERSATILE_FPGA_IRQ
 	help
 	  This enables support for ARM Ltd Versatile board.
 

arch/arm/mach-integrator/include/mach/irqs.h

@@ -19,64 +19,63 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
-/* 
- *  Interrupt numbers
+/*
+ * Interrupt numbers, all of the above are just static reservations
+ * used so they can be encoded into device resources. They will finally
+ * be done away with when switching to device tree.
  */
-#define IRQ_PIC_START			1
-#define IRQ_SOFTINT			1
-#define IRQ_UARTINT0			2
-#define IRQ_UARTINT1			3
-#define IRQ_KMIINT0			4
-#define IRQ_KMIINT1			5
-#define IRQ_TIMERINT0			6
-#define IRQ_TIMERINT1			7
-#define IRQ_TIMERINT2			8
-#define IRQ_RTCINT			9
-#define IRQ_AP_EXPINT0			10
-#define IRQ_AP_EXPINT1			11
-#define IRQ_AP_EXPINT2			12
-#define IRQ_AP_EXPINT3			13
-#define IRQ_AP_PCIINT0			14
-#define IRQ_AP_PCIINT1			15
-#define IRQ_AP_PCIINT2			16
-#define IRQ_AP_PCIINT3			17
-#define IRQ_AP_V3INT			18
-#define IRQ_AP_CPINT0			19
-#define IRQ_AP_CPINT1			20
-#define IRQ_AP_LBUSTIMEOUT 		21
-#define IRQ_AP_APCINT			22
-#define IRQ_CP_CLCDCINT			23
-#define IRQ_CP_MMCIINT0			24
-#define IRQ_CP_MMCIINT1			25
-#define IRQ_CP_AACIINT			26
-#define IRQ_CP_CPPLDINT			27
-#define IRQ_CP_ETHINT			28
-#define IRQ_CP_TSPENINT			29
-#define IRQ_PIC_END			29
+#define IRQ_PIC_START			64
+#define IRQ_SOFTINT			(IRQ_PIC_START+0)
+#define IRQ_UARTINT0			(IRQ_PIC_START+1)
+#define IRQ_UARTINT1			(IRQ_PIC_START+2)
+#define IRQ_KMIINT0			(IRQ_PIC_START+3)
+#define IRQ_KMIINT1			(IRQ_PIC_START+4)
+#define IRQ_TIMERINT0			(IRQ_PIC_START+5)
+#define IRQ_TIMERINT1			(IRQ_PIC_START+6)
+#define IRQ_TIMERINT2			(IRQ_PIC_START+7)
+#define IRQ_RTCINT			(IRQ_PIC_START+8)
+#define IRQ_AP_EXPINT0			(IRQ_PIC_START+9)
+#define IRQ_AP_EXPINT1			(IRQ_PIC_START+10)
+#define IRQ_AP_EXPINT2			(IRQ_PIC_START+11)
+#define IRQ_AP_EXPINT3			(IRQ_PIC_START+12)
+#define IRQ_AP_PCIINT0			(IRQ_PIC_START+13)
+#define IRQ_AP_PCIINT1			(IRQ_PIC_START+14)
+#define IRQ_AP_PCIINT2			(IRQ_PIC_START+15)
+#define IRQ_AP_PCIINT3			(IRQ_PIC_START+16)
+#define IRQ_AP_V3INT			(IRQ_PIC_START+17)
+#define IRQ_AP_CPINT0			(IRQ_PIC_START+18)
+#define IRQ_AP_CPINT1			(IRQ_PIC_START+19)
+#define IRQ_AP_LBUSTIMEOUT 		(IRQ_PIC_START+20)
+#define IRQ_AP_APCINT			(IRQ_PIC_START+21)
+#define IRQ_CP_CLCDCINT			(IRQ_PIC_START+22)
+#define IRQ_CP_MMCIINT0			(IRQ_PIC_START+23)
+#define IRQ_CP_MMCIINT1			(IRQ_PIC_START+24)
+#define IRQ_CP_AACIINT			(IRQ_PIC_START+25)
+#define IRQ_CP_CPPLDINT			(IRQ_PIC_START+26)
+#define IRQ_CP_ETHINT			(IRQ_PIC_START+27)
+#define IRQ_CP_TSPENINT			(IRQ_PIC_START+28)
+#define IRQ_PIC_END			(IRQ_PIC_START+28)
 
-#define IRQ_CIC_START			32
-#define IRQ_CM_SOFTINT			32
-#define IRQ_CM_COMMRX			33
-#define IRQ_CM_COMMTX			34
-#define IRQ_CIC_END			34
+#define IRQ_CIC_START			(IRQ_PIC_END+1)
+#define IRQ_CM_SOFTINT			(IRQ_CIC_START+0)
+#define IRQ_CM_COMMRX			(IRQ_CIC_START+1)
+#define IRQ_CM_COMMTX			(IRQ_CIC_START+2)
+#define IRQ_CIC_END			(IRQ_CIC_START+2)
 
 /*
  * IntegratorCP only
  */
-#define IRQ_SIC_START			35
-#define IRQ_SIC_CP_SOFTINT		35
-#define IRQ_SIC_CP_RI0			36
-#define IRQ_SIC_CP_RI1			37
-#define IRQ_SIC_CP_CARDIN		38
-#define IRQ_SIC_CP_LMINT0		39
-#define IRQ_SIC_CP_LMINT1		40
-#define IRQ_SIC_CP_LMINT2		41
-#define IRQ_SIC_CP_LMINT3		42
-#define IRQ_SIC_CP_LMINT4		43
-#define IRQ_SIC_CP_LMINT5		44
-#define IRQ_SIC_CP_LMINT6		45
-#define IRQ_SIC_CP_LMINT7		46
-#define IRQ_SIC_END			46
-
-#define NR_IRQS_INTEGRATOR_AP		34
-#define NR_IRQS_INTEGRATOR_CP		47
+#define IRQ_SIC_START			(IRQ_CIC_END+1)
+#define IRQ_SIC_CP_SOFTINT		(IRQ_SIC_START+0)
+#define IRQ_SIC_CP_RI0			(IRQ_SIC_START+1)
+#define IRQ_SIC_CP_RI1			(IRQ_SIC_START+2)
+#define IRQ_SIC_CP_CARDIN		(IRQ_SIC_START+3)
+#define IRQ_SIC_CP_LMINT0		(IRQ_SIC_START+4)
+#define IRQ_SIC_CP_LMINT1		(IRQ_SIC_START+5)
+#define IRQ_SIC_CP_LMINT2		(IRQ_SIC_START+6)
+#define IRQ_SIC_CP_LMINT3		(IRQ_SIC_START+7)
+#define IRQ_SIC_CP_LMINT4		(IRQ_SIC_START+8)
+#define IRQ_SIC_CP_LMINT5		(IRQ_SIC_START+9)
+#define IRQ_SIC_CP_LMINT6		(IRQ_SIC_START+10)
+#define IRQ_SIC_CP_LMINT7		(IRQ_SIC_START+11)
+#define IRQ_SIC_END			(IRQ_SIC_START+11)

arch/arm/mach-integrator/integrator_ap.c

@@ -31,6 +31,7 @@
 #include <linux/clockchips.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
+#include <linux/irqchip/versatile-fpga.h>
 #include <linux/mtd/physmap.h>
 #include <linux/clk.h>
 #include <linux/platform_data/clk-integrator.h>
@@ -56,8 +57,6 @@
 #include <asm/mach/pci.h>
 #include <asm/mach/time.h>
 
-#include <plat/fpga-irq.h>
-
 #include "common.h"
 
 /* 
@@ -499,7 +498,6 @@ static const char * ap_dt_board_compat[] = {
 DT_MACHINE_START(INTEGRATOR_AP_DT, "ARM Integrator/AP (Device Tree)")
 	.reserve	= integrator_reserve,
 	.map_io		= ap_map_io,
-	.nr_irqs	= NR_IRQS_INTEGRATOR_AP,
 	.init_early	= ap_init_early,
 	.init_irq	= ap_init_irq_of,
 	.handle_irq	= fpga_handle_irq,
@@ -609,7 +607,6 @@ MACHINE_START(INTEGRATOR, "ARM-Integrator")
 	.atag_offset	= 0x100,
 	.reserve	= integrator_reserve,
 	.map_io		= ap_map_io,
-	.nr_irqs	= NR_IRQS_INTEGRATOR_AP,
 	.init_early	= ap_init_early,
 	.init_irq	= ap_init_irq,
 	.handle_irq	= fpga_handle_irq,

arch/arm/mach-integrator/integrator_cp.c

@@ -20,6 +20,7 @@
 #include <linux/amba/clcd.h>
 #include <linux/amba/mmci.h>
 #include <linux/io.h>
+#include <linux/irqchip/versatile-fpga.h>
 #include <linux/gfp.h>
 #include <linux/mtd/physmap.h>
 #include <linux/platform_data/clk-integrator.h>
@@ -46,7 +47,6 @@
 #include <asm/hardware/timer-sp.h>
 
 #include <plat/clcd.h>
-#include <plat/fpga-irq.h>
 #include <plat/sched_clock.h>
 
 #include "common.h"
@@ -350,7 +350,6 @@ static const char * intcp_dt_board_compat[] = {
 DT_MACHINE_START(INTEGRATOR_CP_DT, "ARM Integrator/CP (Device Tree)")
 	.reserve	= integrator_reserve,
 	.map_io		= intcp_map_io,
-	.nr_irqs	= NR_IRQS_INTEGRATOR_CP,
 	.init_early	= intcp_init_early,
 	.init_irq	= intcp_init_irq_of,
 	.handle_irq	= fpga_handle_irq,
@@ -423,7 +422,7 @@ static void __init intcp_init_irq(void)
 	u32 pic_mask, cic_mask, sic_mask;
 
 	/* These masks are for the HW IRQ registers */
-	pic_mask = ~((~0u) << (11 - IRQ_PIC_START));
+	pic_mask = ~((~0u) << (11 - 0));
 	pic_mask |= (~((~0u) << (29 - 22))) << 22;
 	cic_mask = ~((~0u) << (1 + IRQ_CIC_END - IRQ_CIC_START));
 	sic_mask = ~((~0u) << (1 + IRQ_SIC_END - IRQ_SIC_START));
@@ -504,7 +503,6 @@ MACHINE_START(CINTEGRATOR, "ARM-IntegratorCP")
 	.atag_offset	= 0x100,
 	.reserve	= integrator_reserve,
 	.map_io		= intcp_map_io,
-	.nr_irqs	= NR_IRQS_INTEGRATOR_CP,
 	.init_early	= intcp_init_early,
 	.init_irq	= intcp_init_irq,
 	.handle_irq	= fpga_handle_irq,

arch/arm/mach-versatile/core.c

@@ -32,6 +32,7 @@
 #include <linux/amba/mmci.h>
 #include <linux/amba/pl022.h>
 #include <linux/io.h>
+#include <linux/irqchip/versatile-fpga.h>
 #include <linux/gfp.h>
 #include <linux/clkdev.h>
 #include <linux/mtd/physmap.h>
@@ -51,7 +52,6 @@
 #include <asm/hardware/timer-sp.h>
 
 #include <plat/clcd.h>
-#include <plat/fpga-irq.h>
 #include <plat/sched_clock.h>
 
 #include "core.h"

arch/arm/plat-versatile/Kconfig

@@ -6,15 +6,6 @@ config PLAT_VERSATILE_CLOCK
 config PLAT_VERSATILE_CLCD
 	bool
 
-config PLAT_VERSATILE_FPGA_IRQ
-	bool
-	select IRQ_DOMAIN
-
-config PLAT_VERSATILE_FPGA_IRQ_NR
-       int
-       default 4
-       depends on PLAT_VERSATILE_FPGA_IRQ
-
 config PLAT_VERSATILE_LEDS
 	def_bool y if NEW_LEDS
 	depends on ARCH_REALVIEW || ARCH_VERSATILE

arch/arm/plat-versatile/Makefile

@@ -2,7 +2,6 @@ ccflags-$(CONFIG_ARCH_MULTIPLATFORM) := -I$(srctree)/$(src)/include
 
 obj-$(CONFIG_PLAT_VERSATILE_CLOCK) += clock.o
 obj-$(CONFIG_PLAT_VERSATILE_CLCD) += clcd.o
-obj-$(CONFIG_PLAT_VERSATILE_FPGA_IRQ) += fpga-irq.o
 obj-$(CONFIG_PLAT_VERSATILE_LEDS) += leds.o
 obj-$(CONFIG_PLAT_VERSATILE_SCHED_CLOCK) += sched-clock.o
 obj-$(CONFIG_SMP) += headsmp.o platsmp.o

drivers/irqchip/Kconfig

@@ -1 +1,8 @@
-# empty
+config VERSATILE_FPGA_IRQ
+	bool
+	select IRQ_DOMAIN
+
+config VERSATILE_FPGA_IRQ_NR
+       int
+       default 4
+       depends on VERSATILE_FPGA_IRQ

drivers/irqchip/Makefile

@@ -1 +1,2 @@
 obj-$(CONFIG_ARCH_BCM2835) += irq-bcm2835.o
+obj-$(CONFIG_VERSATILE_FPGA_IRQ) += irq-versatile-fpga.o

arch/arm/plat-versatile/fpga-irq.c → drivers/irqchip/irq-versatile-fpga.c

@@ -1,16 +1,17 @@
 /*
  *  Support for Versatile FPGA-based IRQ controllers
  */
+#include <linux/bitops.h>
 #include <linux/irq.h>
 #include <linux/io.h>
+#include <linux/irqchip/versatile-fpga.h>
 #include <linux/irqdomain.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 
 #include <asm/exception.h>
 #include <asm/mach/irq.h>
-#include <plat/fpga-irq.h>
 
 #define IRQ_STATUS		0x00
 #define IRQ_RAW_STATUS		0x04
@@ -41,7 +42,7 @@ struct fpga_irq_data {
 };
 
 /* we cannot allocate memory when the controllers are initially registered */
-static struct fpga_irq_data fpga_irq_devices[CONFIG_PLAT_VERSATILE_FPGA_IRQ_NR];
+static struct fpga_irq_data fpga_irq_devices[CONFIG_VERSATILE_FPGA_IRQ_NR];
 static int fpga_irq_id;
 
 static void fpga_irq_mask(struct irq_data *d)
@@ -117,13 +118,12 @@ static int fpga_irqdomain_map(struct irq_domain *d, unsigned int irq,
 	struct fpga_irq_data *f = d->host_data;
 
 	/* Skip invalid IRQs, only register handlers for the real ones */
-	if (!(f->valid & (1 << hwirq)))
+	if (!(f->valid & BIT(hwirq)))
 		return -ENOTSUPP;
 	irq_set_chip_data(irq, f);
 	irq_set_chip_and_handler(irq, &f->chip,
 				handle_level_irq);
 	set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
-	f->used_irqs++;
 	return 0;
 }
 
@@ -132,13 +132,15 @@ static struct irq_domain_ops fpga_irqdomain_ops = {
 	.xlate = irq_domain_xlate_onetwocell,
 };
 
-static __init struct fpga_irq_data *
-fpga_irq_prep_struct(void __iomem *base, const char *name, u32 valid) {
+void __init fpga_irq_init(void __iomem *base, const char *name, int irq_start,
+			  int parent_irq, u32 valid, struct device_node *node)
+{
 	struct fpga_irq_data *f;
+	int i;
 
 	if (fpga_irq_id >= ARRAY_SIZE(fpga_irq_devices)) {
-		printk(KERN_ERR "%s: too few FPGA IRQ controllers, increase CONFIG_PLAT_VERSATILE_FPGA_IRQ_NR\n", __func__);
-		return NULL;
+		pr_err("%s: too few FPGA IRQ controllers, increase CONFIG_PLAT_VERSATILE_FPGA_IRQ_NR\n", __func__);
+		return;
 	}
 	f = &fpga_irq_devices[fpga_irq_id];
 	f->base = base;
@@ -147,29 +149,28 @@ fpga_irq_prep_struct(void __iomem *base, const char *name, u32 valid) {
 	f->chip.irq_mask = fpga_irq_mask;
 	f->chip.irq_unmask = fpga_irq_unmask;
 	f->valid = valid;
-	fpga_irq_id++;
-
-	return f;
-}
-
-void __init fpga_irq_init(void __iomem *base, const char *name, int irq_start,
-			  int parent_irq, u32 valid, struct device_node *node)
-{
-	struct fpga_irq_data *f;
-
-	f = fpga_irq_prep_struct(base, name, valid);
-	if (!f)
-		return;
 
 	if (parent_irq != -1) {
 		irq_set_handler_data(parent_irq, f);
 		irq_set_chained_handler(parent_irq, fpga_irq_handle);
 	}
 
-	f->domain = irq_domain_add_legacy(node, fls(valid), irq_start, 0,
+	/* This will also allocate irq descriptors */
+	f->domain = irq_domain_add_simple(node, fls(valid), irq_start,
 					  &fpga_irqdomain_ops, f);
+
+	/* This will allocate all valid descriptors in the linear case */
+	for (i = 0; i < fls(valid); i++)
+		if (valid & BIT(i)) {
+			if (!irq_start)
+				irq_create_mapping(f->domain, i);
+			f->used_irqs++;
+		}
+
 	pr_info("FPGA IRQ chip %d \"%s\" @ %p, %u irqs\n",
 		fpga_irq_id, name, base, f->used_irqs);
+
+	fpga_irq_id++;
 }
 
 #ifdef CONFIG_OF
@@ -193,18 +194,11 @@ int __init fpga_irq_of_init(struct device_node *node,
 	if (of_property_read_u32(node, "valid-mask", &valid_mask))
 		valid_mask = 0;
 
-	f = fpga_irq_prep_struct(base, node->name, valid_mask);
-	if (!f)
-		return -ENOMEM;
+	fpga_irq_init(base, node->name, 0, -1, valid_mask, node);
 
 	writel(clear_mask, base + IRQ_ENABLE_CLEAR);
 	writel(clear_mask, base + FIQ_ENABLE_CLEAR);
 
-	f->domain = irq_domain_add_linear(node, fls(valid_mask), &fpga_irqdomain_ops, f);
-	f->used_irqs = hweight32(valid_mask);
-
-	pr_info("FPGA IRQ chip %d \"%s\" @ %p, %u irqs\n",
-		fpga_irq_id, node->name, base, f->used_irqs);
 	return 0;
 }
 #endif