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Message-Id: <1351805329-19576-1-git-send-email-linus.walleij@linaro.org>
Date: Thu, 1 Nov 2012 22:28:49 +0100
From: Linus Walleij <linus.walleij@...aro.org>
To: linux-arm-kernel@...ts.infradead.org
Cc: arm@...nel.org, Thomas Gleixner <tglx@...utronix.de>,
linux-kernel@...r.kernel.org, Rob Herring <robherring2@...il.com>,
Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH v2] ARM: plat-versatile: move FPGA irq driver to drivers/irqchip
This moves the Versatile FPGA interrupt controller driver, used in
the Integrator/AP, Integrator/CP and some Versatile boards, out
of arch/arm/plat-versatile and down to drivers/irqchip where we
have consensus that such drivers belong. The header file is
consequently moved to <linux/platform_data/irq-versatile-fpga.h>.
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
ChangeLog v1->v2:
- Moved include to <linux/irqchip/versatile-fpga.h>
- Deleted merge/moval artifact
---
arch/arm/Kconfig | 4 +-
arch/arm/mach-integrator/integrator_ap.c | 3 +-
arch/arm/mach-integrator/integrator_cp.c | 2 +-
arch/arm/mach-versatile/core.c | 2 +-
arch/arm/plat-versatile/Kconfig | 9 --
arch/arm/plat-versatile/Makefile | 1 -
arch/arm/plat-versatile/fpga-irq.c | 204 ------------------------
arch/arm/plat-versatile/include/plat/fpga-irq.h | 13 --
drivers/irqchip/Kconfig | 9 +-
drivers/irqchip/Makefile | 1 +
drivers/irqchip/irq-versatile-fpga.c | 204 ++++++++++++++++++++++++
include/linux/irqchip/versatile-fpga.h | 13 ++
12 files changed, 231 insertions(+), 234 deletions(-)
delete mode 100644 arch/arm/plat-versatile/fpga-irq.c
delete mode 100644 arch/arm/plat-versatile/include/plat/fpga-irq.h
create mode 100644 drivers/irqchip/irq-versatile-fpga.c
create mode 100644 include/linux/irqchip/versatile-fpga.h
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 73067ef..2205e3e 100644
--- a/arch/arm/Kconfig
+++ b/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.
diff --git a/arch/arm/mach-integrator/integrator_ap.c b/arch/arm/mach-integrator/integrator_ap.c
index 4f13bc5..e67a9fe 100644
--- a/arch/arm/mach-integrator/integrator_ap.c
+++ b/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"
/*
diff --git a/arch/arm/mach-integrator/integrator_cp.c b/arch/arm/mach-integrator/integrator_cp.c
index 4423bc8..acecf04 100644
--- a/arch/arm/mach-integrator/integrator_cp.c
+++ b/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"
diff --git a/arch/arm/mach-versatile/core.c b/arch/arm/mach-versatile/core.c
index 5b5c1ee..5d59294 100644
--- a/arch/arm/mach-versatile/core.c
+++ b/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"
diff --git a/arch/arm/plat-versatile/Kconfig b/arch/arm/plat-versatile/Kconfig
index 2a4ae8a..619f0fa 100644
--- a/arch/arm/plat-versatile/Kconfig
+++ b/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
diff --git a/arch/arm/plat-versatile/Makefile b/arch/arm/plat-versatile/Makefile
index 74cfd94..f88d448 100644
--- a/arch/arm/plat-versatile/Makefile
+++ b/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
diff --git a/arch/arm/plat-versatile/fpga-irq.c b/arch/arm/plat-versatile/fpga-irq.c
deleted file mode 100644
index dfe317c..0000000
--- a/arch/arm/plat-versatile/fpga-irq.c
+++ /dev/null
@@ -1,204 +0,0 @@
-/*
- * Support for Versatile FPGA-based IRQ controllers
- */
-#include <linux/bitops.h>
-#include <linux/irq.h>
-#include <linux/io.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
-#define IRQ_ENABLE_SET 0x08
-#define IRQ_ENABLE_CLEAR 0x0c
-#define INT_SOFT_SET 0x10
-#define INT_SOFT_CLEAR 0x14
-#define FIQ_STATUS 0x20
-#define FIQ_RAW_STATUS 0x24
-#define FIQ_ENABLE 0x28
-#define FIQ_ENABLE_SET 0x28
-#define FIQ_ENABLE_CLEAR 0x2C
-
-/**
- * struct fpga_irq_data - irq data container for the FPGA IRQ controller
- * @base: memory offset in virtual memory
- * @chip: chip container for this instance
- * @domain: IRQ domain for this instance
- * @valid: mask for valid IRQs on this controller
- * @used_irqs: number of active IRQs on this controller
- */
-struct fpga_irq_data {
- void __iomem *base;
- struct irq_chip chip;
- u32 valid;
- struct irq_domain *domain;
- u8 used_irqs;
-};
-
-/* 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 int fpga_irq_id;
-
-static void fpga_irq_mask(struct irq_data *d)
-{
- struct fpga_irq_data *f = irq_data_get_irq_chip_data(d);
- u32 mask = 1 << d->hwirq;
-
- writel(mask, f->base + IRQ_ENABLE_CLEAR);
-}
-
-static void fpga_irq_unmask(struct irq_data *d)
-{
- struct fpga_irq_data *f = irq_data_get_irq_chip_data(d);
- u32 mask = 1 << d->hwirq;
-
- writel(mask, f->base + IRQ_ENABLE_SET);
-}
-
-static void fpga_irq_handle(unsigned int irq, struct irq_desc *desc)
-{
- struct fpga_irq_data *f = irq_desc_get_handler_data(desc);
- u32 status = readl(f->base + IRQ_STATUS);
-
- if (status == 0) {
- do_bad_IRQ(irq, desc);
- return;
- }
-
- do {
- irq = ffs(status) - 1;
- status &= ~(1 << irq);
- generic_handle_irq(irq_find_mapping(f->domain, irq));
- } while (status);
-}
-
-/*
- * Handle each interrupt in a single FPGA IRQ controller. Returns non-zero
- * if we've handled at least one interrupt. This does a single read of the
- * status register and handles all interrupts in order from LSB first.
- */
-static int handle_one_fpga(struct fpga_irq_data *f, struct pt_regs *regs)
-{
- int handled = 0;
- int irq;
- u32 status;
-
- while ((status = readl(f->base + IRQ_STATUS))) {
- irq = ffs(status) - 1;
- handle_IRQ(irq_find_mapping(f->domain, irq), regs);
- handled = 1;
- }
-
- return handled;
-}
-
-/*
- * Keep iterating over all registered FPGA IRQ controllers until there are
- * no pending interrupts.
- */
-asmlinkage void __exception_irq_entry fpga_handle_irq(struct pt_regs *regs)
-{
- int i, handled;
-
- do {
- for (i = 0, handled = 0; i < fpga_irq_id; ++i)
- handled |= handle_one_fpga(&fpga_irq_devices[i], regs);
- } while (handled);
-}
-
-static int fpga_irqdomain_map(struct irq_domain *d, unsigned int irq,
- irq_hw_number_t hwirq)
-{
- struct fpga_irq_data *f = d->host_data;
-
- /* Skip invalid IRQs, only register handlers for the real ones */
- 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);
- return 0;
-}
-
-static struct irq_domain_ops fpga_irqdomain_ops = {
- .map = fpga_irqdomain_map,
- .xlate = irq_domain_xlate_onetwocell,
-};
-
-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)) {
- 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;
- f->chip.name = name;
- f->chip.irq_ack = fpga_irq_mask;
- f->chip.irq_mask = fpga_irq_mask;
- f->chip.irq_unmask = fpga_irq_unmask;
- f->valid = valid;
-
- if (parent_irq != -1) {
- irq_set_handler_data(parent_irq, f);
- irq_set_chained_handler(parent_irq, fpga_irq_handle);
- }
-
- /* 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
-int __init fpga_irq_of_init(struct device_node *node,
- struct device_node *parent)
-{
- struct fpga_irq_data *f;
- void __iomem *base;
- u32 clear_mask;
- u32 valid_mask;
-
- if (WARN_ON(!node))
- return -ENODEV;
-
- base = of_iomap(node, 0);
- WARN(!base, "unable to map fpga irq registers\n");
-
- if (of_property_read_u32(node, "clear-mask", &clear_mask))
- clear_mask = 0;
-
- if (of_property_read_u32(node, "valid-mask", &valid_mask))
- valid_mask = 0;
-
- 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);
-
- return 0;
-}
-#endif
diff --git a/arch/arm/plat-versatile/include/plat/fpga-irq.h b/arch/arm/plat-versatile/include/plat/fpga-irq.h
deleted file mode 100644
index 1fac965..0000000
--- a/arch/arm/plat-versatile/include/plat/fpga-irq.h
+++ /dev/null
@@ -1,13 +0,0 @@
-#ifndef PLAT_FPGA_IRQ_H
-#define PLAT_FPGA_IRQ_H
-
-struct device_node;
-struct pt_regs;
-
-void fpga_handle_irq(struct pt_regs *regs);
-void fpga_irq_init(void __iomem *, const char *, int, int, u32,
- struct device_node *node);
-int fpga_irq_of_init(struct device_node *node,
- struct device_node *parent);
-
-#endif
diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index 1bb8bf6..62ca575 100644
--- a/drivers/irqchip/Kconfig
+++ b/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
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index 054321d..e2e6eb5 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -1 +1,2 @@
obj-$(CONFIG_ARCH_BCM2835) += irq-bcm2835.o
+obj-$(CONFIG_VERSATILE_FPGA_IRQ) += irq-versatile-fpga.o
diff --git a/drivers/irqchip/irq-versatile-fpga.c b/drivers/irqchip/irq-versatile-fpga.c
new file mode 100644
index 0000000..789b3e5
--- /dev/null
+++ b/drivers/irqchip/irq-versatile-fpga.c
@@ -0,0 +1,204 @@
+/*
+ * 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>
+
+#define IRQ_STATUS 0x00
+#define IRQ_RAW_STATUS 0x04
+#define IRQ_ENABLE_SET 0x08
+#define IRQ_ENABLE_CLEAR 0x0c
+#define INT_SOFT_SET 0x10
+#define INT_SOFT_CLEAR 0x14
+#define FIQ_STATUS 0x20
+#define FIQ_RAW_STATUS 0x24
+#define FIQ_ENABLE 0x28
+#define FIQ_ENABLE_SET 0x28
+#define FIQ_ENABLE_CLEAR 0x2C
+
+/**
+ * struct fpga_irq_data - irq data container for the FPGA IRQ controller
+ * @base: memory offset in virtual memory
+ * @chip: chip container for this instance
+ * @domain: IRQ domain for this instance
+ * @valid: mask for valid IRQs on this controller
+ * @used_irqs: number of active IRQs on this controller
+ */
+struct fpga_irq_data {
+ void __iomem *base;
+ struct irq_chip chip;
+ u32 valid;
+ struct irq_domain *domain;
+ u8 used_irqs;
+};
+
+/* we cannot allocate memory when the controllers are initially registered */
+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)
+{
+ struct fpga_irq_data *f = irq_data_get_irq_chip_data(d);
+ u32 mask = 1 << d->hwirq;
+
+ writel(mask, f->base + IRQ_ENABLE_CLEAR);
+}
+
+static void fpga_irq_unmask(struct irq_data *d)
+{
+ struct fpga_irq_data *f = irq_data_get_irq_chip_data(d);
+ u32 mask = 1 << d->hwirq;
+
+ writel(mask, f->base + IRQ_ENABLE_SET);
+}
+
+static void fpga_irq_handle(unsigned int irq, struct irq_desc *desc)
+{
+ struct fpga_irq_data *f = irq_desc_get_handler_data(desc);
+ u32 status = readl(f->base + IRQ_STATUS);
+
+ if (status == 0) {
+ do_bad_IRQ(irq, desc);
+ return;
+ }
+
+ do {
+ irq = ffs(status) - 1;
+ status &= ~(1 << irq);
+ generic_handle_irq(irq_find_mapping(f->domain, irq));
+ } while (status);
+}
+
+/*
+ * Handle each interrupt in a single FPGA IRQ controller. Returns non-zero
+ * if we've handled at least one interrupt. This does a single read of the
+ * status register and handles all interrupts in order from LSB first.
+ */
+static int handle_one_fpga(struct fpga_irq_data *f, struct pt_regs *regs)
+{
+ int handled = 0;
+ int irq;
+ u32 status;
+
+ while ((status = readl(f->base + IRQ_STATUS))) {
+ irq = ffs(status) - 1;
+ handle_IRQ(irq_find_mapping(f->domain, irq), regs);
+ handled = 1;
+ }
+
+ return handled;
+}
+
+/*
+ * Keep iterating over all registered FPGA IRQ controllers until there are
+ * no pending interrupts.
+ */
+asmlinkage void __exception_irq_entry fpga_handle_irq(struct pt_regs *regs)
+{
+ int i, handled;
+
+ do {
+ for (i = 0, handled = 0; i < fpga_irq_id; ++i)
+ handled |= handle_one_fpga(&fpga_irq_devices[i], regs);
+ } while (handled);
+}
+
+static int fpga_irqdomain_map(struct irq_domain *d, unsigned int irq,
+ irq_hw_number_t hwirq)
+{
+ struct fpga_irq_data *f = d->host_data;
+
+ /* Skip invalid IRQs, only register handlers for the real ones */
+ 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);
+ return 0;
+}
+
+static struct irq_domain_ops fpga_irqdomain_ops = {
+ .map = fpga_irqdomain_map,
+ .xlate = irq_domain_xlate_onetwocell,
+};
+
+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)) {
+ 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;
+ f->chip.name = name;
+ f->chip.irq_ack = fpga_irq_mask;
+ f->chip.irq_mask = fpga_irq_mask;
+ f->chip.irq_unmask = fpga_irq_unmask;
+ f->valid = valid;
+
+ if (parent_irq != -1) {
+ irq_set_handler_data(parent_irq, f);
+ irq_set_chained_handler(parent_irq, fpga_irq_handle);
+ }
+
+ /* 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
+int __init fpga_irq_of_init(struct device_node *node,
+ struct device_node *parent)
+{
+ struct fpga_irq_data *f;
+ void __iomem *base;
+ u32 clear_mask;
+ u32 valid_mask;
+
+ if (WARN_ON(!node))
+ return -ENODEV;
+
+ base = of_iomap(node, 0);
+ WARN(!base, "unable to map fpga irq registers\n");
+
+ if (of_property_read_u32(node, "clear-mask", &clear_mask))
+ clear_mask = 0;
+
+ if (of_property_read_u32(node, "valid-mask", &valid_mask))
+ valid_mask = 0;
+
+ 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);
+
+ return 0;
+}
+#endif
diff --git a/include/linux/irqchip/versatile-fpga.h b/include/linux/irqchip/versatile-fpga.h
new file mode 100644
index 0000000..1fac965
--- /dev/null
+++ b/include/linux/irqchip/versatile-fpga.h
@@ -0,0 +1,13 @@
+#ifndef PLAT_FPGA_IRQ_H
+#define PLAT_FPGA_IRQ_H
+
+struct device_node;
+struct pt_regs;
+
+void fpga_handle_irq(struct pt_regs *regs);
+void fpga_irq_init(void __iomem *, const char *, int, int, u32,
+ struct device_node *node);
+int fpga_irq_of_init(struct device_node *node,
+ struct device_node *parent);
+
+#endif
--
1.7.11.7
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