On 2020-09-08 08:11, Zhen Lei wrote:
Add support to use dw-apb-ictl as primary interrupt controller.
Suggested-by: Marc Zyngier <m...@kernel.org>
Signed-off-by: Zhen Lei <thunder.leiz...@huawei.com>
Tested-by: Haoyu Lv <lvha...@huawei.com>
---
drivers/irqchip/Kconfig | 2 +-
drivers/irqchip/irq-dw-apb-ictl.c | 75 +++++++++++++++++++++++++++++--
2 files changed, 73 insertions(+), 4 deletions(-)
diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index bfc9719dbcdc..7c2d1c8fa551 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -148,7 +148,7 @@ config DAVINCI_CP_INTC
config DW_APB_ICTL
bool
select GENERIC_IRQ_CHIP
- select IRQ_DOMAIN
+ select IRQ_DOMAIN_HIERARCHY
config FARADAY_FTINTC010
bool
diff --git a/drivers/irqchip/irq-dw-apb-ictl.c
b/drivers/irqchip/irq-dw-apb-ictl.c
index aa6214da0b1f..405861322596 100644
--- a/drivers/irqchip/irq-dw-apb-ictl.c
+++ b/drivers/irqchip/irq-dw-apb-ictl.c
@@ -17,6 +17,7 @@
#include <linux/irqchip/chained_irq.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
+#include <asm/exception.h>
#define APB_INT_ENABLE_L 0x00
#define APB_INT_ENABLE_H 0x04
@@ -26,6 +27,30 @@
#define APB_INT_FINALSTATUS_H 0x34
#define APB_INT_BASE_OFFSET 0x04
+/*
+ * irq domain of the primary interrupt controller. Currently, only one
is
+ * supported.
By definition, there is only one primary interrupt controller.
+ */
+static struct irq_domain *dw_apb_ictl_irq_domain;
+
+static void __exception_irq_entry dw_apb_ictl_handle_irq(struct
pt_regs *regs)
+{
+ struct irq_domain *d = dw_apb_ictl_irq_domain;
+ int n;
+
+ for (n = 0; n < d->revmap_size; n += 32) {
+ struct irq_chip_generic *gc = irq_get_domain_generic_chip(d, n);
+ u32 stat = readl_relaxed(gc->reg_base + APB_INT_FINALSTATUS_L);
+
+ while (stat) {
+ u32 hwirq = ffs(stat) - 1;
+
+ handle_domain_irq(d, hwirq, regs);
+ stat &= ~(1 << hwirq);
nit: prefer BIT(hwirq)
+ }
+ }
+}
+
static void dw_apb_ictl_handle_irq_cascaded(struct irq_desc *desc)
{
struct irq_domain *d = irq_desc_get_handler_data(desc);
@@ -50,6 +75,30 @@ static void dw_apb_ictl_handle_irq_cascaded(struct
irq_desc *desc)
chained_irq_exit(chip, desc);
}
+static int dw_apb_ictl_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 irq_fwspec *fwspec = arg;
+
+ ret = irq_domain_translate_onecell(domain, fwspec, &hwirq, &type);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < nr_irqs; i++)
+ irq_map_generic_chip(domain, virq + i, hwirq + i);
+
+ return 0;
+}
+
+static const struct irq_domain_ops dw_apb_ictl_irq_domain_ops = {
+ .translate = irq_domain_translate_onecell,
+ .alloc = dw_apb_ictl_irq_domain_alloc,
+ .free = irq_domain_free_irqs_top,
+};
+
#ifdef CONFIG_PM
static void dw_apb_ictl_resume(struct irq_data *d)
{
@@ -78,11 +127,24 @@ static int __init dw_apb_ictl_init(struct
device_node *np,
const struct irq_domain_ops *domain_ops = &irq_generic_chip_ops;
irq_flow_handler_t flow_handler = handle_level_irq;
+ if (dw_apb_ictl_irq_domain) {
+ pr_err("%pOF: a hierarchy irq domain is already exist.\n", np);
+ return -EBUSY;
How can this happen?
+ }
+
/* Map the parent interrupt for the chained handler */
parent_irq = irq_of_parse_and_map(np, 0);
if (parent_irq <= 0) {
- pr_err("%pOF: unable to parse irq\n", np);
- return -EINVAL
Checking for an output interrupt is not the way to check for a chained
interrupt controller. That's what the parent device_node is for (no
parent or parent == self denotes a primary controller).
;
+ /* It's used as secondary interrupt controller */
+ if (of_find_property(np, "interrupts", NULL)) {
+ pr_err("%pOF: unable to parse irq\n", np);
+ return -EINVAL;
+ }
+
+ /* It's used as the primary interrupt controller */
+ parent_irq = 0;
+ domain_ops = &dw_apb_ictl_irq_domain_ops;
+ flow_handler = handle_fasteoi_irq;
Why? This irqchip obviously doesn't support an EOI method since you
setting it to a NOP callback below. From what I understand, this
controller should use handle_level_irq, just like its chained version.
}
ret = of_address_to_resource(np, 0, &r);
@@ -145,10 +207,17 @@ static int __init dw_apb_ictl_init(struct
device_node *np,
gc->chip_types[0].chip.irq_mask = irq_gc_mask_set_bit;
gc->chip_types[0].chip.irq_unmask = irq_gc_mask_clr_bit;
gc->chip_types[0].chip.irq_resume = dw_apb_ictl_resume;
+ if (!parent_irq)
+ gc->chip_types[0].chip.irq_eoi = irq_gc_noop;
}
- irq_set_chained_handler_and_data(parent_irq,
+ if (parent_irq) {
+ irq_set_chained_handler_and_data(parent_irq,
dw_apb_ictl_handle_irq_cascaded, domain);
+ } else {
+ dw_apb_ictl_irq_domain = domain;
+ set_handle_irq(dw_apb_ictl_handle_irq);
+ }
return 0;
Thanks,
M.
--
Jazz is not dead. It just smells funny...
