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Message-id: <1351585356-13008-1-git-send-email-thomas.abraham@linaro.org>
Date: Tue, 30 Oct 2012 13:52:36 +0530
From: Thomas Abraham <thomas.abraham@...aro.org>
To: linux-samsung-soc@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
kgene.kim@...sung.com
Subject: [PATCH] ARM: Exynos: move interrupt combiner controller driver to
drivers/irqchip
The irqchip support for interrupt combiner controller is moved into
drivers/irqchip directory from arch/arm/mach-exynos/common.c file.
While at it, the use of soc_is_exynos4/5() macro in the combiner controller
driver (used to determine the number of combiners) is removed. Instead, a new
parameter is added to combiner_init function that allows non-dt platform code
to specify the number of combiners available.
Signed-off-by: Thomas Abraham <thomas.abraham@...aro.org>
---
arch/arm/mach-exynos/common.c | 210 +------------------------------
drivers/irqchip/Makefile | 1 +
drivers/irqchip/irq-exynos-combiner.c | 212 +++++++++++++++++++++++++++++++
include/linux/irqchip/exynos-combiner.h | 18 +++
4 files changed, 234 insertions(+), 207 deletions(-)
create mode 100644 drivers/irqchip/irq-exynos-combiner.c
create mode 100644 include/linux/irqchip/exynos-combiner.h
diff --git a/arch/arm/mach-exynos/common.c b/arch/arm/mach-exynos/common.c
index 5c75815..56844d1 100644
--- a/arch/arm/mach-exynos/common.c
+++ b/arch/arm/mach-exynos/common.c
@@ -17,11 +17,9 @@
#include <linux/gpio.h>
#include <linux/sched.h>
#include <linux/serial_core.h>
-#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/export.h>
-#include <linux/irqdomain.h>
-#include <linux/of_address.h>
+#include <linux/irqchip/exynos-combiner.h>
#include <asm/proc-fns.h>
#include <asm/exception.h>
@@ -384,210 +382,7 @@ static void __init exynos5_init_clocks(int xtal)
exynos5_setup_clocks();
}
-#define COMBINER_ENABLE_SET 0x0
-#define COMBINER_ENABLE_CLEAR 0x4
-#define COMBINER_INT_STATUS 0xC
-
-static DEFINE_SPINLOCK(irq_controller_lock);
-
-struct combiner_chip_data {
- unsigned int irq_offset;
- unsigned int irq_mask;
- void __iomem *base;
-};
-
-static struct irq_domain *combiner_irq_domain;
-static struct combiner_chip_data combiner_data[MAX_COMBINER_NR];
-
-static inline void __iomem *combiner_base(struct irq_data *data)
-{
- struct combiner_chip_data *combiner_data =
- irq_data_get_irq_chip_data(data);
-
- return combiner_data->base;
-}
-
-static void combiner_mask_irq(struct irq_data *data)
-{
- u32 mask = 1 << (data->hwirq % 32);
-
- __raw_writel(mask, combiner_base(data) + COMBINER_ENABLE_CLEAR);
-}
-
-static void combiner_unmask_irq(struct irq_data *data)
-{
- u32 mask = 1 << (data->hwirq % 32);
-
- __raw_writel(mask, combiner_base(data) + COMBINER_ENABLE_SET);
-}
-
-static void combiner_handle_cascade_irq(unsigned int irq, struct irq_desc *desc)
-{
- struct combiner_chip_data *chip_data = irq_get_handler_data(irq);
- struct irq_chip *chip = irq_get_chip(irq);
- unsigned int cascade_irq, combiner_irq;
- unsigned long status;
-
- chained_irq_enter(chip, desc);
-
- spin_lock(&irq_controller_lock);
- status = __raw_readl(chip_data->base + COMBINER_INT_STATUS);
- spin_unlock(&irq_controller_lock);
- status &= chip_data->irq_mask;
-
- if (status == 0)
- goto out;
-
- combiner_irq = __ffs(status);
-
- cascade_irq = combiner_irq + (chip_data->irq_offset & ~31);
- if (unlikely(cascade_irq >= NR_IRQS))
- do_bad_IRQ(cascade_irq, desc);
- else
- generic_handle_irq(cascade_irq);
-
- out:
- chained_irq_exit(chip, desc);
-}
-
-static struct irq_chip combiner_chip = {
- .name = "COMBINER",
- .irq_mask = combiner_mask_irq,
- .irq_unmask = combiner_unmask_irq,
-};
-
-static void __init combiner_cascade_irq(unsigned int combiner_nr, unsigned int irq)
-{
- unsigned int max_nr;
-
- if (soc_is_exynos5250())
- max_nr = EXYNOS5_MAX_COMBINER_NR;
- else
- max_nr = EXYNOS4_MAX_COMBINER_NR;
-
- if (combiner_nr >= max_nr)
- BUG();
- if (irq_set_handler_data(irq, &combiner_data[combiner_nr]) != 0)
- BUG();
- irq_set_chained_handler(irq, combiner_handle_cascade_irq);
-}
-
-static void __init combiner_init_one(unsigned int combiner_nr,
- void __iomem *base)
-{
- combiner_data[combiner_nr].base = base;
- combiner_data[combiner_nr].irq_offset = irq_find_mapping(
- combiner_irq_domain, combiner_nr * MAX_IRQ_IN_COMBINER);
- combiner_data[combiner_nr].irq_mask = 0xff << ((combiner_nr % 4) << 3);
-
- /* Disable all interrupts */
- __raw_writel(combiner_data[combiner_nr].irq_mask,
- base + COMBINER_ENABLE_CLEAR);
-}
-
#ifdef CONFIG_OF
-static int combiner_irq_domain_xlate(struct irq_domain *d,
- struct device_node *controller,
- const u32 *intspec, unsigned int intsize,
- unsigned long *out_hwirq,
- unsigned int *out_type)
-{
- if (d->of_node != controller)
- return -EINVAL;
-
- if (intsize < 2)
- return -EINVAL;
-
- *out_hwirq = intspec[0] * MAX_IRQ_IN_COMBINER + intspec[1];
- *out_type = 0;
-
- return 0;
-}
-#else
-static int combiner_irq_domain_xlate(struct irq_domain *d,
- struct device_node *controller,
- const u32 *intspec, unsigned int intsize,
- unsigned long *out_hwirq,
- unsigned int *out_type)
-{
- return -EINVAL;
-}
-#endif
-
-static int combiner_irq_domain_map(struct irq_domain *d, unsigned int irq,
- irq_hw_number_t hw)
-{
- irq_set_chip_and_handler(irq, &combiner_chip, handle_level_irq);
- irq_set_chip_data(irq, &combiner_data[hw >> 3]);
- set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
-
- return 0;
-}
-
-static struct irq_domain_ops combiner_irq_domain_ops = {
- .xlate = combiner_irq_domain_xlate,
- .map = combiner_irq_domain_map,
-};
-
-static void __init combiner_init(void __iomem *combiner_base,
- struct device_node *np)
-{
- int i, irq, irq_base;
- unsigned int max_nr, nr_irq;
-
- if (np) {
- if (of_property_read_u32(np, "samsung,combiner-nr", &max_nr)) {
- pr_warning("%s: number of combiners not specified, "
- "setting default as %d.\n",
- __func__, EXYNOS4_MAX_COMBINER_NR);
- max_nr = EXYNOS4_MAX_COMBINER_NR;
- }
- } else {
- max_nr = soc_is_exynos5250() ? EXYNOS5_MAX_COMBINER_NR :
- EXYNOS4_MAX_COMBINER_NR;
- }
- nr_irq = max_nr * MAX_IRQ_IN_COMBINER;
-
- irq_base = irq_alloc_descs(COMBINER_IRQ(0, 0), 1, nr_irq, 0);
- if (IS_ERR_VALUE(irq_base)) {
- irq_base = COMBINER_IRQ(0, 0);
- pr_warning("%s: irq desc alloc failed. Continuing with %d as linux irq base\n", __func__, irq_base);
- }
-
- combiner_irq_domain = irq_domain_add_legacy(np, nr_irq, irq_base, 0,
- &combiner_irq_domain_ops, &combiner_data);
- if (WARN_ON(!combiner_irq_domain)) {
- pr_warning("%s: irq domain init failed\n", __func__);
- return;
- }
-
- for (i = 0; i < max_nr; i++) {
- combiner_init_one(i, combiner_base + (i >> 2) * 0x10);
- irq = IRQ_SPI(i);
-#ifdef CONFIG_OF
- if (np)
- irq = irq_of_parse_and_map(np, i);
-#endif
- combiner_cascade_irq(i, irq);
- }
-}
-
-#ifdef CONFIG_OF
-int __init combiner_of_init(struct device_node *np, struct device_node *parent)
-{
- void __iomem *combiner_base;
-
- combiner_base = of_iomap(np, 0);
- if (!combiner_base) {
- pr_err("%s: failed to map combiner registers\n", __func__);
- return -ENXIO;
- }
-
- combiner_init(combiner_base, np);
-
- return 0;
-}
-
static const struct of_device_id exynos4_dt_irq_match[] = {
{ .compatible = "arm,cortex-a9-gic", .data = gic_of_init, },
{ .compatible = "samsung,exynos4210-combiner",
@@ -610,7 +405,8 @@ void __init exynos4_init_irq(void)
#endif
if (!of_have_populated_dt())
- combiner_init(S5P_VA_COMBINER_BASE, NULL);
+ combiner_init(S5P_VA_COMBINER_BASE, EXYNOS4_MAX_COMBINER_NR,
+ NULL);
/*
* The parameters of s5p_init_irq() are for VIC init.
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index 054321d..8501eaa 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -1 +1,2 @@
obj-$(CONFIG_ARCH_BCM2835) += irq-bcm2835.o
+obj-$(CONFIG_ARCH_EXYNOS) += irq-exynos-combiner.o
diff --git a/drivers/irqchip/irq-exynos-combiner.c b/drivers/irqchip/irq-exynos-combiner.c
new file mode 100644
index 0000000..86caa98
--- /dev/null
+++ b/drivers/irqchip/irq-exynos-combiner.c
@@ -0,0 +1,212 @@
+/*
+ * Copyright (c) 2012-2013 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com
+ *
+ * Interrupt combiner controller driver for Samsung Exynos platforms.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/export.h>
+#include <linux/irqdomain.h>
+#include <linux/of_address.h>
+#include <linux/err.h>
+#include <asm/mach/irq.h>
+
+#define COMBINER_ENABLE_SET 0x0
+#define COMBINER_ENABLE_CLEAR 0x4
+#define COMBINER_INT_STATUS 0xC
+
+struct combiner_chip_data {
+ unsigned int irq_offset;
+ unsigned int irq_mask;
+ void __iomem *base;
+};
+
+static DEFINE_SPINLOCK(irq_controller_lock);
+static struct irq_domain *combiner_irq_domain;
+static struct combiner_chip_data combiner_data[MAX_COMBINER_NR];
+
+static inline void __iomem *combiner_base(struct irq_data *data)
+{
+ struct combiner_chip_data *combiner_data =
+ irq_data_get_irq_chip_data(data);
+
+ return combiner_data->base;
+}
+
+static void combiner_mask_irq(struct irq_data *data)
+{
+ u32 mask = 1 << (data->hwirq % 32);
+
+ __raw_writel(mask, combiner_base(data) + COMBINER_ENABLE_CLEAR);
+}
+
+static void combiner_unmask_irq(struct irq_data *data)
+{
+ u32 mask = 1 << (data->hwirq % 32);
+
+ __raw_writel(mask, combiner_base(data) + COMBINER_ENABLE_SET);
+}
+
+static void combiner_handle_cascade_irq(unsigned int irq, struct irq_desc *desc)
+{
+ struct combiner_chip_data *chip_data = irq_get_handler_data(irq);
+ struct irq_chip *chip = irq_get_chip(irq);
+ unsigned int cascade_irq, combiner_irq;
+ unsigned long status;
+
+ chained_irq_enter(chip, desc);
+
+ spin_lock(&irq_controller_lock);
+ status = __raw_readl(chip_data->base + COMBINER_INT_STATUS);
+ spin_unlock(&irq_controller_lock);
+ status &= chip_data->irq_mask;
+
+ if (status == 0)
+ goto out;
+
+ combiner_irq = __ffs(status);
+
+ cascade_irq = combiner_irq + (chip_data->irq_offset & ~31);
+ if (unlikely(cascade_irq >= NR_IRQS))
+ do_bad_IRQ(cascade_irq, desc);
+ else
+ generic_handle_irq(cascade_irq);
+
+ out:
+ chained_irq_exit(chip, desc);
+}
+
+static struct irq_chip combiner_chip = {
+ .name = "COMBINER",
+ .irq_mask = combiner_mask_irq,
+ .irq_unmask = combiner_unmask_irq,
+};
+
+static void __init combiner_cascade_irq(unsigned int combiner_nr,
+ unsigned int irq)
+{
+ if (irq_set_handler_data(irq, &combiner_data[combiner_nr]) != 0)
+ BUG();
+ irq_set_chained_handler(irq, combiner_handle_cascade_irq);
+}
+
+static void __init combiner_init_one(unsigned int combiner_nr,
+ void __iomem *base)
+{
+ combiner_data[combiner_nr].base = base;
+ combiner_data[combiner_nr].irq_offset = irq_find_mapping(
+ combiner_irq_domain, combiner_nr * MAX_IRQ_IN_COMBINER);
+ combiner_data[combiner_nr].irq_mask = 0xff << ((combiner_nr % 4) << 3);
+
+ /* Disable all interrupts */
+ __raw_writel(combiner_data[combiner_nr].irq_mask,
+ base + COMBINER_ENABLE_CLEAR);
+}
+
+#ifdef CONFIG_OF
+static int combiner_irq_domain_xlate(struct irq_domain *d,
+ struct device_node *controller,
+ const u32 *intspec, unsigned int intsize,
+ unsigned long *out_hwirq,
+ unsigned int *out_type)
+{
+ if (d->of_node != controller)
+ return -EINVAL;
+
+ if (intsize < 2)
+ return -EINVAL;
+
+ *out_hwirq = intspec[0] * MAX_IRQ_IN_COMBINER + intspec[1];
+ *out_type = 0;
+
+ return 0;
+}
+#else
+static int combiner_irq_domain_xlate(struct irq_domain *d,
+ struct device_node *controller,
+ const u32 *intspec, unsigned int intsize,
+ unsigned long *out_hwirq,
+ unsigned int *out_type)
+{
+ return -EINVAL;
+}
+#endif
+
+static int combiner_irq_domain_map(struct irq_domain *d, unsigned int irq,
+ irq_hw_number_t hw)
+{
+ irq_set_chip_and_handler(irq, &combiner_chip, handle_level_irq);
+ irq_set_chip_data(irq, &combiner_data[hw >> 3]);
+ set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
+
+ return 0;
+}
+
+static struct irq_domain_ops combiner_irq_domain_ops = {
+ .xlate = combiner_irq_domain_xlate,
+ .map = combiner_irq_domain_map,
+};
+
+void __init combiner_init(void __iomem *combiner_base, unsigned int nr_combiner,
+ struct device_node *np)
+{
+ int i, irq, irq_base;
+ unsigned int nr_irq;
+
+ nr_irq = nr_combiner * MAX_IRQ_IN_COMBINER;
+
+ irq_base = irq_alloc_descs(COMBINER_IRQ(0, 0), 1, nr_irq, 0);
+ if (IS_ERR_VALUE(irq_base)) {
+ irq_base = COMBINER_IRQ(0, 0);
+ pr_warn("%s: irq desc alloc failed. Continuing with %d as "
+ "linux irq base\n", __func__, irq_base);
+ }
+
+ combiner_irq_domain = irq_domain_add_legacy(np, nr_irq, irq_base, 0,
+ &combiner_irq_domain_ops, &combiner_data);
+ if (WARN_ON(!combiner_irq_domain)) {
+ pr_warn("%s: irq domain init failed\n", __func__);
+ return;
+ }
+
+ for (i = 0; i < nr_combiner; i++) {
+ combiner_init_one(i, combiner_base + (i >> 2) * 0x10);
+ irq = IRQ_SPI(i);
+#ifdef CONFIG_OF
+ if (np)
+ irq = irq_of_parse_and_map(np, i);
+#endif
+ combiner_cascade_irq(i, irq);
+ }
+}
+
+#ifdef CONFIG_OF
+int __init combiner_of_init(struct device_node *np, struct device_node *parent)
+{
+ void __iomem *combiner_base;
+ unsigned int nr_combiner;
+
+ combiner_base = of_iomap(np, 0);
+ if (!combiner_base) {
+ pr_err("%s: failed to map combiner registers\n", __func__);
+ return -ENXIO;
+ }
+
+ if (of_property_read_u32(np, "samsung,combiner-nr", &nr_combiner)) {
+ pr_warn("%s: number of combiners not specified, "
+ "setting default as %d.\n",
+ __func__, EXYNOS4_MAX_COMBINER_NR);
+ nr_combiner = EXYNOS4_MAX_COMBINER_NR;
+ }
+
+ combiner_init(combiner_base, nr_combiner, np);
+ return 0;
+}
+#endif
diff --git a/include/linux/irqchip/exynos-combiner.h b/include/linux/irqchip/exynos-combiner.h
new file mode 100644
index 0000000..faa781c
--- /dev/null
+++ b/include/linux/irqchip/exynos-combiner.h
@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2012-2013 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __LINUX_IRQCHIP_EXYNOS_COMBINER_H_
+#define __LINUX_IRQCHIP_EXYNOS_COMBINER_H_
+
+extern void __init combiner_init(void __iomem *combiner_base,
+ unsigned int nr_combiner, struct device_node *np);
+extern int __init combiner_of_init(struct device_node *np,
+ struct device_node *parent);
+
+#endif /* __LINUX_IRQCHIP_EXYNOS_COMBINER_H_ */
--
1.6.6.rc2
--
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