[RFC PATCH v4 05/17] irqchip/sun4i: Add a struct to hold global variables

From: Mesih Kilinc <mesihkilinc@gmail.com>
To: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org,
	linux-gpio@vger.kernel.org, linux-sunxi@googlegroups.com
Cc: Mesih Kilinc <mesihkilinc@gmail.com>,
	Maxime Ripard <maxime.ripard@free-electrons.com>,
	Chen-Yu Tsai <wens@csie.org>,
	Russell King <linux@armlinux.org.uk>,
	Daniel Lezcano <daniel.lezcano@linaro.org>,
	Marc Zyngier <marc.zyngier@arm.com>,
	Linus Walleij <linus.walleij@linaro.org>,
	Icenowy Zheng <icenowy@aosc.io>, Rob Herring <robh+dt@kernel.org>,
	Julian Calaby <julian.calaby@gmail.com>
Subject: [RFC PATCH v4 05/17] irqchip/sun4i: Add a struct to hold global variables
Date: Sun, 25 Nov 2018 10:43:08 +0300	[thread overview]
Message-ID: <2904a51d360af76765eccfb3b963a867a06a14ee.1543131714.git.mesihkilinc@gmail.com> (raw)
In-Reply-To: <cover.1543131714.git.mesihkilinc@gmail.com>

In order to support different chips, IC specific data should be hold in
a struct. This patch moves irq_base and irq_domain global variables to
struct.

Signed-off-by: Mesih Kilinc <mesihkilinc@gmail.com>
---
 drivers/irqchip/irq-sun4i.c | 64 +++++++++++++++++++++++++++------------------
 1 file changed, 38 insertions(+), 26 deletions(-)

diff --git a/drivers/irqchip/irq-sun4i.c b/drivers/irqchip/irq-sun4i.c
index e3e5b91..0c32506 100644
--- a/drivers/irqchip/irq-sun4i.c
+++ b/drivers/irqchip/irq-sun4i.c
@@ -31,8 +31,12 @@
 #define SUN4I_IRQ_ENABLE_REG(x)		(0x40 + 0x4 * x)
 #define SUN4I_IRQ_MASK_REG(x)		(0x50 + 0x4 * x)
 
-static void __iomem *sun4i_irq_base;
-static struct irq_domain *sun4i_irq_domain;
+struct sun4i_irq_chip_data {
+	void __iomem *irq_base;
+	struct irq_domain *irq_domain;
+};
+
+static struct sun4i_irq_chip_data *irq_ic_data;
 
 static void __exception_irq_entry sun4i_handle_irq(struct pt_regs *regs);
 
@@ -43,7 +47,7 @@ static void sun4i_irq_ack(struct irq_data *irqd)
 	if (irq != 0)
 		return; /* Only IRQ 0 / the ENMI needs to be acked */
 
-	writel(BIT(0), sun4i_irq_base + SUN4I_IRQ_PENDING_REG(0));
+	writel(BIT(0), irq_ic_data->irq_base + SUN4I_IRQ_PENDING_REG(0));
 }
 
 static void sun4i_irq_mask(struct irq_data *irqd)
@@ -53,9 +57,9 @@ static void sun4i_irq_mask(struct irq_data *irqd)
 	int reg = irq / 32;
 	u32 val;
 
-	val = readl(sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(reg));
+	val = readl(irq_ic_data->irq_base + SUN4I_IRQ_ENABLE_REG(reg));
 	writel(val & ~(1 << irq_off),
-	       sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(reg));
+	       irq_ic_data->irq_base + SUN4I_IRQ_ENABLE_REG(reg));
 }
 
 static void sun4i_irq_unmask(struct irq_data *irqd)
@@ -65,9 +69,9 @@ static void sun4i_irq_unmask(struct irq_data *irqd)
 	int reg = irq / 32;
 	u32 val;
 
-	val = readl(sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(reg));
+	val = readl(irq_ic_data->irq_base + SUN4I_IRQ_ENABLE_REG(reg));
 	writel(val | (1 << irq_off),
-	       sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(reg));
+	       irq_ic_data->irq_base + SUN4I_IRQ_ENABLE_REG(reg));
 }
 
 static struct irq_chip sun4i_irq_chip = {
@@ -95,35 +99,41 @@ static const struct irq_domain_ops sun4i_irq_ops = {
 static int __init sun4i_of_init(struct device_node *node,
 				struct device_node *parent)
 {
-	sun4i_irq_base = of_iomap(node, 0);
-	if (!sun4i_irq_base)
+	irq_ic_data = kzalloc(sizeof(struct sun4i_irq_chip_data), GFP_KERNEL);
+	if (!irq_ic_data) {
+		pr_err("kzalloc failed!\n");
+		return -ENOMEM;
+	}
+
+	irq_ic_data->irq_base = of_iomap(node, 0);
+	if (!irq_ic_data->irq_base)
 		panic("%pOF: unable to map IC registers\n",
 			node);
 
 	/* Disable all interrupts */
-	writel(0, sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(0));
-	writel(0, sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(1));
-	writel(0, sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(2));
+	writel(0, irq_ic_data->irq_base + SUN4I_IRQ_ENABLE_REG(0));
+	writel(0, irq_ic_data->irq_base + SUN4I_IRQ_ENABLE_REG(1));
+	writel(0, irq_ic_data->irq_base + SUN4I_IRQ_ENABLE_REG(2));
 
 	/* Unmask all the interrupts, ENABLE_REG(x) is used for masking */
-	writel(0, sun4i_irq_base + SUN4I_IRQ_MASK_REG(0));
-	writel(0, sun4i_irq_base + SUN4I_IRQ_MASK_REG(1));
-	writel(0, sun4i_irq_base + SUN4I_IRQ_MASK_REG(2));
+	writel(0, irq_ic_data->irq_base + SUN4I_IRQ_MASK_REG(0));
+	writel(0, irq_ic_data->irq_base + SUN4I_IRQ_MASK_REG(1));
+	writel(0, irq_ic_data->irq_base + SUN4I_IRQ_MASK_REG(2));
 
 	/* Clear all the pending interrupts */
-	writel(0xffffffff, sun4i_irq_base + SUN4I_IRQ_PENDING_REG(0));
-	writel(0xffffffff, sun4i_irq_base + SUN4I_IRQ_PENDING_REG(1));
-	writel(0xffffffff, sun4i_irq_base + SUN4I_IRQ_PENDING_REG(2));
+	writel(0xffffffff, irq_ic_data->irq_base + SUN4I_IRQ_PENDING_REG(0));
+	writel(0xffffffff, irq_ic_data->irq_base + SUN4I_IRQ_PENDING_REG(1));
+	writel(0xffffffff, irq_ic_data->irq_base + SUN4I_IRQ_PENDING_REG(2));
 
 	/* Enable protection mode */
-	writel(0x01, sun4i_irq_base + SUN4I_IRQ_PROTECTION_REG);
+	writel(0x01, irq_ic_data->irq_base + SUN4I_IRQ_PROTECTION_REG);
 
 	/* Configure the external interrupt source type */
-	writel(0x00, sun4i_irq_base + SUN4I_IRQ_NMI_CTRL_REG);
+	writel(0x00, irq_ic_data->irq_base + SUN4I_IRQ_NMI_CTRL_REG);
 
-	sun4i_irq_domain = irq_domain_add_linear(node, 3 * 32,
+	irq_ic_data->irq_domain = irq_domain_add_linear(node, 3 * 32,
 						 &sun4i_irq_ops, NULL);
-	if (!sun4i_irq_domain)
+	if (!irq_ic_data->irq_domain)
 		panic("%pOF: unable to create IRQ domain\n", node);
 
 	set_handle_irq(sun4i_handle_irq);
@@ -146,13 +156,15 @@ static void __exception_irq_entry sun4i_handle_irq(struct pt_regs *regs)
 	 * the extra check in the common case of 1 hapening after having
 	 * read the vector-reg once.
 	 */
-	hwirq = readl(sun4i_irq_base + SUN4I_IRQ_VECTOR_REG) >> 2;
+	hwirq = readl(irq_ic_data->irq_base + SUN4I_IRQ_VECTOR_REG) >> 2;
 	if (hwirq == 0 &&
-		  !(readl(sun4i_irq_base + SUN4I_IRQ_PENDING_REG(0)) & BIT(0)))
+		  !(readl(irq_ic_data->irq_base + SUN4I_IRQ_PENDING_REG(0)) &
+			  BIT(0)))
 		return;
 
 	do {
-		handle_domain_irq(sun4i_irq_domain, hwirq, regs);
-		hwirq = readl(sun4i_irq_base + SUN4I_IRQ_VECTOR_REG) >> 2;
+		handle_domain_irq(irq_ic_data->irq_domain, hwirq, regs);
+		hwirq = readl(irq_ic_data->irq_base +
+				SUN4I_IRQ_VECTOR_REG) >> 2;
 	} while (hwirq != 0);
 }
-- 
2.7.4

