Proof of concept patch to demonstrate the new irqdomain support for
the generic irq chip. Untested !!
Signed-off-by: Thomas Gleixner <t...@linutronix.de>
Cc: Maxime Ripard <maxime.rip...@free-electrons.com>
---
drivers/irqchip/irq-sun4i.c | 100 ++++++++++++--------------------------------
1 file changed, 29 insertions(+), 71 deletions(-)
Index: linux-2.6/drivers/irqchip/irq-sun4i.c
===================================================================
--- linux-2.6.orig/drivers/irqchip/irq-sun4i.c
+++ linux-2.6/drivers/irqchip/irq-sun4i.c
@@ -32,70 +32,43 @@
#define SUN4I_IRQ_FIQ_PENDING_REG(x) (0x20 + 0x4 * x)
#define SUN4I_IRQ_ENABLE_REG(x) (0x40 + 0x4 * x)
#define SUN4I_IRQ_MASK_REG(x) (0x50 + 0x4 * x)
+#define SUN4I_NUM_CHIPS 3
+#define SUN4I_IRQS_PER_CHIP 32
static void __iomem *sun4i_irq_base;
static struct irq_domain *sun4i_irq_domain;
static asmlinkage void __exception_irq_entry sun4i_handle_irq(struct pt_regs
*regs);
-void sun4i_irq_ack(struct irq_data *irqd)
+static int __init sun4i_init_domain_chips(void)
{
- unsigned int irq = irqd_to_hwirq(irqd);
- unsigned int irq_off = irq % 32;
- int reg = irq / 32;
- u32 val;
-
- val = readl(sun4i_irq_base + SUN4I_IRQ_PENDING_REG(reg));
- writel(val | (1 << irq_off),
- sun4i_irq_base + SUN4I_IRQ_PENDING_REG(reg));
-}
-
-static void sun4i_irq_mask(struct irq_data *irqd)
-{
- unsigned int irq = irqd_to_hwirq(irqd);
- unsigned int irq_off = irq % 32;
- int reg = irq / 32;
- u32 val;
-
- val = readl(sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(reg));
- writel(val & ~(1 << irq_off),
- sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(reg));
-}
-
-static void sun4i_irq_unmask(struct irq_data *irqd)
-{
- unsigned int irq = irqd_to_hwirq(irqd);
- unsigned int irq_off = irq % 32;
- int reg = irq / 32;
- u32 val;
-
- val = readl(sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(reg));
- writel(val | (1 << irq_off),
- sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(reg));
-}
-
-static struct irq_chip sun4i_irq_chip = {
- .name = "sun4i_irq",
- .irq_ack = sun4i_irq_ack,
- .irq_mask = sun4i_irq_mask,
- .irq_unmask = sun4i_irq_unmask,
-};
-
-static int sun4i_irq_map(struct irq_domain *d, unsigned int virq,
- irq_hw_number_t hw)
-{
- irq_set_chip_and_handler(virq, &sun4i_irq_chip,
- handle_level_irq);
- set_irq_flags(virq, IRQF_VALID | IRQF_PROBE);
-
+ unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
+ struct irq_chip_generic *gc;
+ int i, ret, base = 0;
+
+ ret = irq_alloc_domain_generic_chips(d, SUN4I_IRQS_PER_CHIP, 1,
+ "sun4i_irq", handle_level_irq,
+ clr, 0, IRQ_GC_INIT_MASK_CACHE);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < SUN4I_NUM_CHIPS; i++, base += SUN4I_IRQS_PER_CHIP) {
+ gc = irq_get_domain_generic_chip(sun4i_irq_domain, base);
+ gc->reg_base = sun4i_irq_base;
+ gc->chip_types[0].regs.mask = SUN4I_IRQ_ENABLE_REG(i);
+ gc->chip_types[0].regs.ack = SUN4I_IRQ_PENDING_REG(i);
+ gc->chip_types[0].chip.mask = irq_gc_mask_clr_bit;
+ gc->chip_types[0].chip.ack = irq_gc_ack_set_bit;
+ gc->chip_types[0].chip.unmask = irq_gc_mask_set_bit;
+
+ /* Disable, mask and clear all pending interrupts */
+ writel(0, sun4i_irq_base + SUN4I_IRQ_ENABLE_REG(i));
+ writel(0, sun4i_irq_base + SUN4I_IRQ_MASK_REG(i));
+ writel(0xffffffff, sun4i_irq_base + SUN4I_IRQ_PENDING_REG(i));
+ }
return 0;
}
-static struct irq_domain_ops sun4i_irq_ops = {
- .map = sun4i_irq_map,
- .xlate = irq_domain_xlate_onecell,
-};
-
static int __init sun4i_of_init(struct device_node *node,
struct device_node *parent)
{
@@ -104,21 +77,6 @@ static int __init sun4i_of_init(struct d
panic("%s: unable to map IC registers\n",
node->full_name);
- /* 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));
-
- /* Mask all the interrupts */
- 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));
-
- /* 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));
-
/* Enable protection mode */
writel(0x01, sun4i_irq_base + SUN4I_IRQ_PROTECTION_REG);
@@ -126,8 +84,8 @@ static int __init sun4i_of_init(struct d
writel(0x00, sun4i_irq_base + SUN4I_IRQ_NMI_CTRL_REG);
sun4i_irq_domain = irq_domain_add_linear(node, 3 * 32,
- &sun4i_irq_ops, NULL);
- if (!sun4i_irq_domain)
+ &irq_generic_chip_ops, NULL);
+ if (!sun4i_irq_domain || sun4i_init_domain_chips())
panic("%s: unable to create IRQ domain\n", node->full_name);
set_handle_irq(sun4i_handle_irq);
--
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