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authorDaniel Mack <zonque@gmail.com>2012-07-22 19:50:22 +0200
committerHaojian Zhuang <haojian.zhuang@gmail.com>2012-08-16 16:14:50 +0800
commit089d03629b04ebe8163905a2398742b426e35085 (patch)
tree4fbca59c4c1af98d901f8eca8a651801f2025a6f /arch/arm/mach-pxa/irq.c
parent9450be76d0e3ebedf301aa09e4f98b4d3a175229 (diff)
downloadop-kernel-dev-089d03629b04ebe8163905a2398742b426e35085.zip
op-kernel-dev-089d03629b04ebe8163905a2398742b426e35085.tar.gz
ARM: pxa: add devicetree code for irq handling
Properly register on-chip interrupt using the irqdomain logic. The number of interrupts is taken from the devicetree node. That includes the following changes: - cpu_has_ipr() was converted from an inline function to a static bool variable, so it can be set using the "marvell,intc-priority" property inside the device node of the tree. - IRQ_BASE was converted from a macro to a runtime variable so that it can be initialized dynamically from the DT init code. - irq_base() now uses pxa_irq_base and just adds an offset. Hence, there are now no compile-time fixed values used in case of DT initialization. Signed-off-by: Daniel Mack <zonque@gmail.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Haojian Zhuang <haojian.zhuang@gmail.com>
Diffstat (limited to 'arch/arm/mach-pxa/irq.c')
-rw-r--r--arch/arm/mach-pxa/irq.c131
1 files changed, 110 insertions, 21 deletions
diff --git a/arch/arm/mach-pxa/irq.c b/arch/arm/mach-pxa/irq.c
index 5dae15e..b6cc181 100644
--- a/arch/arm/mach-pxa/irq.c
+++ b/arch/arm/mach-pxa/irq.c
@@ -17,6 +17,8 @@
#include <linux/syscore_ops.h>
#include <linux/io.h>
#include <linux/irq.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
#include <asm/exception.h>
@@ -25,8 +27,6 @@
#include "generic.h"
-#define IRQ_BASE io_p2v(0x40d00000)
-
#define ICIP (0x000)
#define ICMR (0x004)
#define ICLR (0x008)
@@ -48,22 +48,19 @@
* This is for peripheral IRQs internal to the PXA chip.
*/
+static void __iomem *pxa_irq_base;
static int pxa_internal_irq_nr;
-
-static inline int cpu_has_ipr(void)
-{
- return !cpu_is_pxa25x();
-}
+static bool cpu_has_ipr;
static inline void __iomem *irq_base(int i)
{
- static unsigned long phys_base[] = {
- 0x40d00000,
- 0x40d0009c,
- 0x40d00130,
+ static unsigned long phys_base_offset[] = {
+ 0x0,
+ 0x9c,
+ 0x130,
};
- return io_p2v(phys_base[i]);
+ return pxa_irq_base + phys_base_offset[i];
}
void pxa_mask_irq(struct irq_data *d)
@@ -96,8 +93,8 @@ asmlinkage void __exception_irq_entry icip_handle_irq(struct pt_regs *regs)
uint32_t icip, icmr, mask;
do {
- icip = __raw_readl(IRQ_BASE + ICIP);
- icmr = __raw_readl(IRQ_BASE + ICMR);
+ icip = __raw_readl(pxa_irq_base + ICIP);
+ icmr = __raw_readl(pxa_irq_base + ICMR);
mask = icip & icmr;
if (mask == 0)
@@ -128,6 +125,8 @@ void __init pxa_init_irq(int irq_nr, int (*fn)(struct irq_data *, unsigned int))
BUG_ON(irq_nr > MAX_INTERNAL_IRQS);
pxa_internal_irq_nr = irq_nr;
+ cpu_has_ipr = !cpu_is_pxa25x();
+ pxa_irq_base = io_p2v(0x40d00000);
for (n = 0; n < irq_nr; n += 32) {
void __iomem *base = irq_base(n >> 5);
@@ -136,8 +135,8 @@ void __init pxa_init_irq(int irq_nr, int (*fn)(struct irq_data *, unsigned int))
__raw_writel(0, base + ICLR); /* all IRQs are IRQ, not FIQ */
for (i = n; (i < (n + 32)) && (i < irq_nr); i++) {
/* initialize interrupt priority */
- if (cpu_has_ipr())
- __raw_writel(i | IPR_VALID, IRQ_BASE + IPR(i));
+ if (cpu_has_ipr)
+ __raw_writel(i | IPR_VALID, pxa_irq_base + IPR(i));
irq = PXA_IRQ(i);
irq_set_chip_and_handler(irq, &pxa_internal_irq_chip,
@@ -168,9 +167,9 @@ static int pxa_irq_suspend(void)
__raw_writel(0, base + ICMR);
}
- if (cpu_has_ipr()) {
+ if (cpu_has_ipr) {
for (i = 0; i < pxa_internal_irq_nr; i++)
- saved_ipr[i] = __raw_readl(IRQ_BASE + IPR(i));
+ saved_ipr[i] = __raw_readl(pxa_irq_base + IPR(i));
}
return 0;
@@ -187,11 +186,11 @@ static void pxa_irq_resume(void)
__raw_writel(0, base + ICLR);
}
- if (cpu_has_ipr())
+ if (cpu_has_ipr)
for (i = 0; i < pxa_internal_irq_nr; i++)
- __raw_writel(saved_ipr[i], IRQ_BASE + IPR(i));
+ __raw_writel(saved_ipr[i], pxa_irq_base + IPR(i));
- __raw_writel(1, IRQ_BASE + ICCR);
+ __raw_writel(1, pxa_irq_base + ICCR);
}
#else
#define pxa_irq_suspend NULL
@@ -202,3 +201,93 @@ struct syscore_ops pxa_irq_syscore_ops = {
.suspend = pxa_irq_suspend,
.resume = pxa_irq_resume,
};
+
+#ifdef CONFIG_OF
+static struct irq_domain *pxa_irq_domain;
+
+static int pxa_irq_map(struct irq_domain *h, unsigned int virq,
+ irq_hw_number_t hw)
+{
+ void __iomem *base = irq_base(hw / 32);
+
+ /* initialize interrupt priority */
+ if (cpu_has_ipr)
+ __raw_writel(hw | IPR_VALID, pxa_irq_base + IPR(hw));
+
+ irq_set_chip_and_handler(hw, &pxa_internal_irq_chip,
+ handle_level_irq);
+ irq_set_chip_data(hw, base);
+ set_irq_flags(hw, IRQF_VALID);
+
+ return 0;
+}
+
+static struct irq_domain_ops pxa_irq_ops = {
+ .map = pxa_irq_map,
+ .xlate = irq_domain_xlate_onecell,
+};
+
+static const struct of_device_id intc_ids[] __initconst = {
+ { .compatible = "marvell,pxa-intc", },
+ {}
+};
+
+void __init pxa_dt_irq_init(int (*fn)(struct irq_data *, unsigned int))
+{
+ struct device_node *node;
+ const struct of_device_id *of_id;
+ struct pxa_intc_conf *conf;
+ struct resource res;
+ int n, ret;
+
+ node = of_find_matching_node(NULL, intc_ids);
+ if (!node) {
+ pr_err("Failed to find interrupt controller in arch-pxa\n");
+ return;
+ }
+ of_id = of_match_node(intc_ids, node);
+ conf = of_id->data;
+
+ ret = of_property_read_u32(node, "marvell,intc-nr-irqs",
+ &pxa_internal_irq_nr);
+ if (ret) {
+ pr_err("Not found marvell,intc-nr-irqs property\n");
+ return;
+ }
+
+ ret = of_address_to_resource(node, 0, &res);
+ if (ret < 0) {
+ pr_err("No registers defined for node\n");
+ return;
+ }
+ pxa_irq_base = io_p2v(res.start);
+
+ if (of_find_property(node, "marvell,intc-priority", NULL))
+ cpu_has_ipr = 1;
+
+ ret = irq_alloc_descs(-1, 0, pxa_internal_irq_nr, 0);
+ if (ret < 0) {
+ pr_err("Failed to allocate IRQ numbers\n");
+ return;
+ }
+
+ pxa_irq_domain = irq_domain_add_legacy(node, pxa_internal_irq_nr, 0, 0,
+ &pxa_irq_ops, NULL);
+ if (!pxa_irq_domain)
+ panic("Unable to add PXA IRQ domain\n");
+
+ irq_set_default_host(pxa_irq_domain);
+
+ for (n = 0; n < pxa_internal_irq_nr; n += 32) {
+ void __iomem *base = irq_base(n >> 5);
+
+ __raw_writel(0, base + ICMR); /* disable all IRQs */
+ __raw_writel(0, base + ICLR); /* all IRQs are IRQ, not FIQ */
+ }
+
+ /* only unmasked interrupts kick us out of idle */
+ __raw_writel(1, irq_base(0) + ICCR);
+
+ pxa_internal_irq_chip.irq_set_wake = fn;
+}
+#endif /* CONFIG_OF */
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