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

Mesih Kilinc
2018-11-25T07:45:16Z

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