[PATCH v8 22/37] drivers: misc: irq-uclass: Update irq_get_by_index
Moritz Fischer
moritzf at google.com
Tue Oct 15 02:59:40 CEST 2024
Hi Patrick
On Mon, Oct 14, 2024 at 6:16 AM Patrick Rudolph
<patrick.rudolph at 9elements.com> wrote:
>
> Support reading the "interrupts" property from the devicetree in case
> the "interrupts-extended" property isn't found. As the "interrupts"
> property is commonly used, this allows to parse all existing FDT and
> makes irq_get_by_index() more useful.
>
> The "interrupts" property doesn't contain a phandle as "interrupts-extended"
> does, so implement a new method to locate the interrupt-parent called
> irq_get_interrupt_parent().
>
> TEST: Read the interrupts from the GIC node for ACPI MADT generation.
>
> Signed-off-by: Patrick Rudolph <patrick.rudolph at 9elements.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>
> ---
> arch/sandbox/dts/test.dts | 3 ++
> drivers/misc/irq-uclass.c | 66 ++++++++++++++++++++++++++++++++++++++-
> include/irq.h | 14 +++++++++
> test/dm/irq.c | 15 +++++++++
> 4 files changed, 97 insertions(+), 1 deletion(-)
>
> diff --git a/arch/sandbox/dts/test.dts b/arch/sandbox/dts/test.dts
> index 8412506c17..9599a8db9c 100644
> --- a/arch/sandbox/dts/test.dts
> +++ b/arch/sandbox/dts/test.dts
> @@ -522,6 +522,9 @@
> };
>
> f-test {
> + #interrupt-cells = <2>;
> + interrupt-parent = <&irq>;
> + interrupts = <4 0>;
> compatible = "denx,u-boot-fdt-test";
> };
>
> diff --git a/drivers/misc/irq-uclass.c b/drivers/misc/irq-uclass.c
> index 79eb7c200d..068f67fe02 100644
> --- a/drivers/misc/irq-uclass.c
> +++ b/drivers/misc/irq-uclass.c
> @@ -62,6 +62,40 @@ int irq_read_and_clear(struct irq *irq)
> return ops->read_and_clear(irq);
> }
>
> +int irq_get_interrupt_parent(const struct udevice *dev,
> + struct udevice **interrupt_parent)
> +{
> + struct ofnode_phandle_args phandle_args;
> + struct udevice *irq = NULL;
> + ofnode node;
> + int ret;
> +
> + if (!dev || !interrupt_parent)
> + return -EINVAL;
> +
> + *interrupt_parent = NULL;
> +
> + node = dev_ofnode(dev);
> + if (!ofnode_valid(node))
> + return -EINVAL;
> +
> + while (ofnode_valid(node)) {
> + ret = ofnode_parse_phandle_with_args(node, "interrupt-parent",
> + NULL, 0, 0, &phandle_args);
> + if (!ret && !device_get_global_by_ofnode(phandle_args.node, &irq))
> + break;
> + node = ofnode_get_parent(node);
> + }
> +
> + if (!irq) {
> + log_err("Cannot find an interrupt parent for device %s\n", dev->name);
> + return -ENODEV;
> + }
> + *interrupt_parent = irq;
> +
> + return 0;
> +}
> +
> #if CONFIG_IS_ENABLED(OF_PLATDATA)
> int irq_get_by_phandle(struct udevice *dev, const struct phandle_2_arg *cells,
> struct irq *irq)
> @@ -142,10 +176,40 @@ err:
> int irq_get_by_index(struct udevice *dev, int index, struct irq *irq)
> {
> struct ofnode_phandle_args args;
> - int ret;
> + struct udevice *interrupt_parent;
> + int ret, size, i;
> + const __be32 *list;
> + u32 count;
>
> ret = dev_read_phandle_with_args(dev, "interrupts-extended",
> "#interrupt-cells", 0, index, &args);
> + if (ret) {
> + list = dev_read_prop(dev, "interrupts", &size);
> + if (!list)
> + return -ENOENT;
> +
> + ret = irq_get_interrupt_parent(dev, &interrupt_parent);
> + if (ret)
> + return -ENODEV;
> + args.node = dev_ofnode(interrupt_parent);
> +
> + if (dev_read_u32(dev, "#interrupt-cells", &count)) {
> + log_err("%s: could not get #interrupt-cells for %s\n",
> + __func__, dev->name);
> + return -ENOENT;
> + }
Don't you want to read this out of the interrupt-parent?
> +
> + if (index * count >= size / sizeof(*list))
> + return -ENOENT;
> + if (count > OF_MAX_PHANDLE_ARGS)
> + count = OF_MAX_PHANDLE_ARGS;
> + args.args_count = count;
> + for (i = 0; i < count; i++)
> + args.args[i] = be32_to_cpup(&list[index * count + i]);
> +
> + return irq_get_by_index_tail(ret, dev_ofnode(dev), &args,
> + "interrupts", index, irq);
> + }
>
> return irq_get_by_index_tail(ret, dev_ofnode(dev), &args,
> "interrupts-extended", index > 0, irq);
> diff --git a/include/irq.h b/include/irq.h
> index 5638c10128..0fbc1a5f48 100644
> --- a/include/irq.h
> +++ b/include/irq.h
> @@ -200,6 +200,20 @@ int irq_restore_polarities(struct udevice *dev);
> */
> int irq_read_and_clear(struct irq *irq);
>
> +/**
> + * irq_get_interrupt_parent() - returns the interrupt parent
> + *
> + * Walks the devicetree and returns the interrupt parent's ofnode
> + * for the specified device.
> + *
> + * @dev: device
> + * @interrupt_parent: The interrupt parent's ofnode'
> + * Return: 0 success, or error value
> + *
> + */
> +int irq_get_interrupt_parent(const struct udevice *dev,
> + struct udevice **interrupt_parent);
> +
> struct phandle_2_arg;
> /**
> * irq_get_by_phandle() - Get an irq by its phandle information (of-platadata)
> diff --git a/test/dm/irq.c b/test/dm/irq.c
> index 836f2d82e7..ca3e188065 100644
> --- a/test/dm/irq.c
> +++ b/test/dm/irq.c
> @@ -76,6 +76,21 @@ static int dm_test_request(struct unit_test_state *uts)
> }
> DM_TEST(dm_test_request, UTF_SCAN_PDATA | UTF_SCAN_FDT);
>
> +/* Test of irq_get_by_index() */
> +static int dm_test_irq_get_by_index(struct unit_test_state *uts)
> +{
> + struct udevice *dev;
> + struct irq irq;
> +
> + ut_assertok(uclass_get_device_by_name(UCLASS_TEST_FDT, "f-test",
> + &dev));
> + ut_assertok(irq_get_by_index(dev, 0, &irq));
> + ut_asserteq(4, irq.id);
> +
> + return 0;
> +}
> +DM_TEST(dm_test_irq_get_by_index, UTF_SCAN_PDATA | UTF_SCAN_FDT);
> +
> /* Test of irq_get_acpi() */
> static int dm_test_irq_get_acpi(struct unit_test_state *uts)
> {
> --
> 2.46.2
>
Cheers,
Moritz
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