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Date: Fri, 24 Oct 2014 14:50:02 +0800
From: Yingjoe Chen <yingjoe.chen@...iatek.com>
To: Rob Herring <robh+dt@...nel.org>,
Jiang Liu <jiang.liu@...ux.intel.com>,
Marc Zyngier <marc.zyngier@....com>, <arm@...nel.org>,
Matthias Brugger <matthias.bgg@...il.com>
CC: Mark Rutland <mark.rutland@....com>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
<yingjoe.chen@...il.com>,
Boris BREZILLON <boris.brezillon@...e-electrons.com>,
Russell King <linux@....linux.org.uk>,
Arnd Bergmann <arnd@...db.de>, <yh.chen@...iatek.com>,
<nathan.chung@...iatek.com>,
Grant Likely <grant.likely@...aro.org>,
<devicetree@...r.kernel.org>, Jason Cooper <jason@...edaemon.net>,
Pawel Moll <pawel.moll@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Hans de Goede <hdegoede@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>,
<eddie.huang@...iatek.com>, <linux-arm-kernel@...ts.infradead.org>,
<srv_heupstream@...iatek.com>, <hc.yen@...iatek.com>,
<linux-kernel@...r.kernel.org>, Kumar Gala <galak@...eaurora.org>,
Olof Johansson <olof@...om.net>
Subject: Re: [PATCH v4 4/7] irqchip: gic: Support hierarchy irq domain.
Sorry, I missed Marc's patch while working on this version and that did
address something I missed in my version. I'd like to replace 4/7 with
this one.
Joe.C
==========================================
Add support to use gic as a parent for stacked irq domain.
Signed-off-by: Yingjoe Chen <yingjoe.chen@...iatek.com>
---
drivers/irqchip/Kconfig | 1 +
drivers/irqchip/irq-gic.c | 89 +++++++++++++++++++++++++++++++++--------------
2 files changed, 64 insertions(+), 26 deletions(-)
diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index b8632bf..2a48e0a 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -5,6 +5,7 @@ config IRQCHIP
config ARM_GIC
bool
select IRQ_DOMAIN
+ select IRQ_DOMAIN_HIERARCHY
select MULTI_IRQ_HANDLER
config GIC_NON_BANKED
diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index dda6dbc..8eaedf5 100644
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -767,19 +767,17 @@ void __init gic_init_physaddr(struct device_node *node)
static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
irq_hw_number_t hw)
{
+ irq_domain_set_hwirq_and_chip(d, irq, hw, &gic_chip, d->host_data);
if (hw < 32) {
irq_set_percpu_devid(irq);
- irq_set_chip_and_handler(irq, &gic_chip,
- handle_percpu_devid_irq);
+ irq_set_handler(irq, handle_percpu_devid_irq);
set_irq_flags(irq, IRQF_VALID | IRQF_NOAUTOEN);
} else {
- irq_set_chip_and_handler(irq, &gic_chip,
- handle_fasteoi_irq);
+ irq_set_handler(irq, handle_fasteoi_irq);
set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
gic_routable_irq_domain_ops->map(d, irq, hw);
}
- irq_set_chip_data(irq, d->host_data);
return 0;
}
@@ -795,8 +793,6 @@ static int gic_irq_domain_xlate(struct irq_domain *d,
{
unsigned long ret = 0;
- if (d->of_node != controller)
- return -EINVAL;
if (intsize < 3)
return -EINVAL;
@@ -839,6 +835,42 @@ static struct notifier_block gic_cpu_notifier = {
};
#endif
+static int gic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
+ unsigned int nr_irqs, void *arg)
+{
+ int i, ret;
+ irq_hw_number_t hwirq;
+ unsigned int type = IRQ_TYPE_NONE;
+ struct of_phandle_args *irq_data = arg;
+
+ ret = gic_irq_domain_xlate(domain, irq_data->np, irq_data->args,
+ irq_data->args_count, &hwirq, &type);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < nr_irqs; i++)
+ gic_irq_domain_map(domain, virq+i, hwirq+i);
+
+ return 0;
+}
+
+static void gic_irq_domain_free(struct irq_domain *domain, unsigned int virq,
+ unsigned int nr_irqs)
+{
+ int i;
+
+ for (i = 0; i < nr_irqs; i++) {
+ irq_set_handler(virq + i, NULL);
+ irq_domain_set_hwirq_and_chip(domain, virq + i, 0, NULL, NULL);
+ }
+}
+
+static const struct irq_domain_ops gic_irq_domain_hierarchy_ops = {
+ .xlate = gic_irq_domain_xlate,
+ .alloc = gic_irq_domain_alloc,
+ .free = gic_irq_domain_free,
+};
+
static const struct irq_domain_ops gic_irq_domain_ops = {
.map = gic_irq_domain_map,
.unmap = gic_irq_domain_unmap,
@@ -929,18 +961,6 @@ void __init gic_init_bases(unsigned int gic_nr, int irq_start,
gic_cpu_map[i] = 0xff;
/*
- * For primary GICs, skip over SGIs.
- * For secondary GICs, skip over PPIs, too.
- */
- if (gic_nr == 0 && (irq_start & 31) > 0) {
- hwirq_base = 16;
- if (irq_start != -1)
- irq_start = (irq_start & ~31) + 16;
- } else {
- hwirq_base = 32;
- }
-
- /*
* Find out how many interrupts are supported.
* The GIC only supports up to 1020 interrupt sources.
*/
@@ -950,10 +970,31 @@ void __init gic_init_bases(unsigned int gic_nr, int irq_start,
gic_irqs = 1020;
gic->gic_irqs = gic_irqs;
- gic_irqs -= hwirq_base; /* calculate # of irqs to allocate */
+ if (node) { /* DT case */
+ const struct irq_domain_ops *ops = &gic_irq_domain_hierarchy_ops;
+
+ if (!of_property_read_u32(node, "arm,routable-irqs",
+ &nr_routable_irqs)) {
+ ops = &gic_irq_domain_ops;
+ gic_irqs = nr_routable_irqs;
+ }
+
+ gic->domain = irq_domain_add_linear(node, gic_irqs, ops, gic);
+ } else { /* Non-DT case */
+ /*
+ * For primary GICs, skip over SGIs.
+ * For secondary GICs, skip over PPIs, too.
+ */
+ if (gic_nr == 0 && (irq_start & 31) > 0) {
+ hwirq_base = 16;
+ if (irq_start != -1)
+ irq_start = (irq_start & ~31) + 16;
+ } else {
+ hwirq_base = 32;
+ }
+
+ gic_irqs -= hwirq_base; /* calculate # of irqs to allocate */
- if (of_property_read_u32(node, "arm,routable-irqs",
- &nr_routable_irqs)) {
irq_base = irq_alloc_descs(irq_start, 16, gic_irqs,
numa_node_id());
if (IS_ERR_VALUE(irq_base)) {
@@ -964,10 +1005,6 @@ void __init gic_init_bases(unsigned int gic_nr, int irq_start,
gic->domain = irq_domain_add_legacy(node, gic_irqs, irq_base,
hwirq_base, &gic_irq_domain_ops, gic);
- } else {
- gic->domain = irq_domain_add_linear(node, nr_routable_irqs,
- &gic_irq_domain_ops,
- gic);
}
if (WARN_ON(!gic->domain))
--
1.8.1.1.dirty
--
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