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Message-Id: <1327450719-25590-1-git-send-email-grant.likely@secretlab.ca>
Date: Tue, 24 Jan 2012 17:18:38 -0700
From: Grant Likely <grant.likely@...retlab.ca>
To: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linuxppc-dev@...ts.ozlabs.org
Cc: Grant Likely <grant.likely@...retlab.ca>,
Rob Herring <rob.herring@...xeda.com>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: [RFC 1/2] irq_domain: Create common xlate functions that device drivers can use
Rather than having each interrupt controller driver creating its own barely
unique .xlate function for irq_domain, create a library of translators which
any driver can use directly.
Signed-off-by: Grant Likely <grant.likely@...retlab.ca>
Cc: Rob Herring <rob.herring@...xeda.com>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
---
This builds on top of my irq_domain series and will be included with it when
I post v3. Rob, does this serve your needs for generic irq controller DT
support?
g.
include/linux/irqdomain.h | 15 ++++++++++
kernel/irq/irqdomain.c | 69 +++++++++++++++++++++++++++++++++++++++-----
2 files changed, 76 insertions(+), 8 deletions(-)
diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index e7379a3..5e497a0 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -110,6 +110,9 @@ struct irq_domain {
void *host_data;
irq_hw_number_t inval_irq;
+ /* Data for common irq xlate functions */
+ unsigned int xlate_type;
+
/* Optional device node pointer */
struct device_node *of_node;
};
@@ -163,6 +166,18 @@ extern unsigned int irq_linear_revmap(struct irq_domain *host,
irq_hw_number_t hwirq);
extern struct irq_domain_ops irq_domain_simple_ops;
+
+/* stock xlate functions */
+int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
+ const u32 *intspec, unsigned int intsize,
+ irq_hw_number_t *out_hwirq, unsigned int *out_type);
+int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
+ const u32 *intspec, unsigned int intsize,
+ irq_hw_number_t *out_hwirq, unsigned int *out_type);
+int irq_domain_xlate_onetwocell(struct irq_domain *d, struct device_node *ctrlr,
+ const u32 *intspec, unsigned int intsize,
+ irq_hw_number_t *out_hwirq, unsigned int *out_type);
+
#if defined(CONFIG_OF_IRQ)
extern void irq_domain_generate_simple(const struct of_device_id *match,
u64 phys_base, unsigned int irq_start);
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index def8e7b..df80205 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -53,6 +53,7 @@ static struct irq_domain *irq_domain_alloc(struct device_node *of_node,
domain->ops = ops;
domain->host_data = host_data;
domain->of_node = of_node_get(of_node);
+ domain->xlate_type = IRQ_TYPE_NONE;
if (domain->ops->match == NULL)
domain->ops->match = default_irq_domain_match;
@@ -690,25 +691,77 @@ int irq_domain_simple_map(struct irq_domain *d, unsigned int irq,
return 0;
}
-int irq_domain_simple_xlate(struct irq_domain *d,
- struct device_node *controller,
- const u32 *intspec, unsigned int intsize,
- unsigned long *out_hwirq, unsigned int *out_type)
+/**
+ * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
+ *
+ * Device Tree IRQ specifier translation function which works with one cell
+ * bindings where the cell value maps directly to the hwirq number.
+ */
+int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
+ const u32 *intspec, unsigned int intsize,
+ unsigned long *out_hwirq, unsigned int *out_type)
+{
+ if (WARN(intsize < 1, "Bad intspec for %s: intsize=%i < 1\n",
+ ctrlr->full_name, intsize))
+ return -EINVAL;
+ *out_hwirq = intspec[0];
+ *out_type = d->xlate_type;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
+
+/**
+ * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
+ *
+ * Device Tree IRQ specifier translation function which works with two cell
+ * bindings where the cell values map directly to the hwirq number
+ * and linux irq flags.
+ */
+int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
+ const u32 *intspec, unsigned int intsize,
+ irq_hw_number_t *out_hwirq, unsigned int *out_type)
{
- if (d->of_node != controller)
+ if (WARN(intsize < 2, "Bad intspec for %s: intsize=%i < 2\n",
+ ctrlr->full_name, intsize))
+ return -EINVAL;
+ if (intsize < 2)
return -EINVAL;
- if (intsize < 1)
+ *out_hwirq = intspec[0];
+ *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
+
+/**
+ * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
+ *
+ * Device Tree IRQ specifier translation function which works with either one
+ * or two cell bindings where the cell values map directly to the hwirq number
+ * and linux irq flags.
+ *
+ * Note: don't use this function unless your interrupt controller explicitly
+ * supports both one and two cell bindings. For the majority of controllers
+ * the _onecell() or _twocell() variants above should be used.
+ */
+int irq_domain_xlate_onetwocell(struct irq_domain *d,
+ struct device_node *ctrlr,
+ const u32 *intspec, unsigned int intsize,
+ unsigned long *out_hwirq, unsigned int *out_type)
+{
+ if (WARN(intsize < 1, "Bad intspec for %s: intsize=%i < 1\n",
+ ctrlr->full_name, intsize))
return -EINVAL;
*out_hwirq = intspec[0];
- *out_type = IRQ_TYPE_NONE;
+ *out_type = d->xlate_type;
if (intsize > 1)
*out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
return 0;
}
+EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
struct irq_domain_ops irq_domain_simple_ops = {
.map = irq_domain_simple_map,
- .xlate = irq_domain_simple_xlate,
+ .xlate = irq_domain_xlate_onetwocell,
};
EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
--
1.7.5.4
--
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