linux-kernel - [PATCH v5 15/37] MIPS: JZ4740: remove jz_intc

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Date:	Sun, 24 May 2015 16:11:25 +0100
From:	Paul Burton <paul.burton@...tec.com>
To:	<linux-mips@...ux-mips.org>
CC:	Paul Burton <paul.burton@...tec.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	Ralf Baechle <ralf@...ux-mips.org>,
	<linux-kernel@...r.kernel.org>,
	Brian Norris <computersforpeace@...il.com>
Subject: [PATCH v5 15/37] MIPS: JZ4740: remove jz_intc_base global

Avoid the need for the global variable jz_intc_base by introducing a
struct ingenic_intc_data and passing it around as the IRQ handler data.

Signed-off-by: Paul Burton <paul.burton@...tec.com>
Cc: Lars-Peter Clausen <lars@...afoo.de>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Jason Cooper <jason@...edaemon.net>
Cc: Ralf Baechle <ralf@...ux-mips.org>
Cc: linux-mips@...ux-mips.org
---

Changes in v5:
- Improve error handling in jz4740_intc_of_init.

Changes in v4: None
Changes in v3:
- New patch.

Changes in v2: None

 arch/mips/jz4740/irq.c | 39 +++++++++++++++++++++++++++++++--------
 1 file changed, 31 insertions(+), 8 deletions(-)

diff --git a/arch/mips/jz4740/irq.c b/arch/mips/jz4740/irq.c
index 615eaa8..854cd14 100644
--- a/arch/mips/jz4740/irq.c
+++ b/arch/mips/jz4740/irq.c
@@ -32,7 +32,9 @@
 
 #include "../../drivers/irqchip/irqchip.h"
 
-static void __iomem *jz_intc_base;
+struct ingenic_intc_data {
+	void __iomem *base;
+};
 
 #define JZ_REG_INTC_STATUS	0x00
 #define JZ_REG_INTC_MASK	0x04
@@ -42,9 +44,10 @@ static void __iomem *jz_intc_base;
 
 static irqreturn_t jz4740_cascade(int irq, void *data)
 {
+	struct ingenic_intc_data *intc = irq_get_handler_data(irq);
 	uint32_t irq_reg;
 
-	irq_reg = readl(jz_intc_base + JZ_REG_INTC_PENDING);
+	irq_reg = readl(intc->base + JZ_REG_INTC_PENDING);
 
 	if (irq_reg)
 		generic_handle_irq(__fls(irq_reg) + JZ4740_IRQ_BASE);
@@ -80,21 +83,34 @@ static struct irqaction jz4740_cascade_action = {
 static int __init jz4740_intc_of_init(struct device_node *node,
 	struct device_node *parent)
 {
+	struct ingenic_intc_data *intc;
 	struct irq_chip_generic *gc;
 	struct irq_chip_type *ct;
 	struct irq_domain *domain;
-	int parent_irq;
+	int parent_irq, err = 0;
+
+	intc = kzalloc(sizeof(*intc), GFP_KERNEL);
+	if (!intc) {
+		err = -ENOMEM;
+		goto out_err;
+	}
 
 	parent_irq = irq_of_parse_and_map(node, 0);
-	if (!parent_irq)
-		return -EINVAL;
+	if (!parent_irq) {
+		err = -EINVAL;
+		goto out_free;
+	}
 
-	jz_intc_base = ioremap(JZ4740_INTC_BASE_ADDR, 0x14);
+	err = irq_set_handler_data(parent_irq, intc);
+	if (err)
+		goto out_unmap_irq;
+
+	intc->base = ioremap(JZ4740_INTC_BASE_ADDR, 0x14);
 
 	/* Mask all irqs */
-	writel(0xffffffff, jz_intc_base + JZ_REG_INTC_SET_MASK);
+	writel(0xffffffff, intc->base + JZ_REG_INTC_SET_MASK);
 
-	gc = irq_alloc_generic_chip("INTC", 1, JZ4740_IRQ_BASE, jz_intc_base,
+	gc = irq_alloc_generic_chip("INTC", 1, JZ4740_IRQ_BASE, intc->base,
 		handle_level_irq);
 
 	gc->wake_enabled = IRQ_MSK(32);
@@ -118,5 +134,12 @@ static int __init jz4740_intc_of_init(struct device_node *node,
 
 	setup_irq(parent_irq, &jz4740_cascade_action);
 	return 0;
+
+out_unmap_irq:
+	irq_dispose_mapping(parent_irq);
+out_free:
+	kfree(intc);
+out_err:
+	return err;
 }
 IRQCHIP_DECLARE(jz4740_intc, "ingenic,jz4740-intc", jz4740_intc_of_init);
-- 
2.4.1

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