Merge patch series "Implement ACPI on aarch64"

Patrick Rudolph <patrick.rudolph@9elements.com> says:

Based on the existing work done by Simon Glass this series adds
support for booting aarch64 devices using ACPI only.
As first target QEMU SBSA support is added, which relies on ACPI
only to boot an OS. As secondary target the Raspberry Pi4 was used,
which is broadly available and allows easy testing of the proposed
solution.

The series is split into ACPI cleanups and code movements, adding
Arm specific ACPI tables and finally SoC and mainboard related
changes to boot a Linux on the QEMU SBSA and RPi4. Currently only the
mandatory ACPI tables are supported, allowing to boot into Linux
without errors.

The QEMU SBSA support is feature complete and provides the same
functionality as the EDK2 implementation.

The changes were tested on real hardware as well on QEMU v9.0:

qemu-system-aarch64 -machine sbsa-ref -nographic -cpu cortex-a57 \
                    -pflash secure-world.rom \
                    -pflash unsecure-world.rom

qemu-system-aarch64 -machine raspi4b -kernel u-boot.bin -cpu cortex-a72 \
-smp 4 -m 2G -drive file=raspbian.img,format=raw,index=0 \
-dtb bcm2711-rpi-4-b.dtb -nographic

Tested against FWTS V24.03.00.

Known issues:
- The QEMU rpi4 support is currently limited as it doesn't emulate PCI,
  USB or ethernet devices!
- The SMP bringup doesn't work on RPi4, but works in QEMU (Possibly
  cache related).
- PCI on RPI4 isn't working on real hardware since the pcie_brcmstb
  Linux kernel module doesn't support ACPI yet.

Link: https://lore.kernel.org/r/20241023132116.970117-1-patrick.rudolph@9elements.com

1 files changed, 65 insertions, 1 deletions

diff --git a/drivers/misc/irq-uclass.c b/drivers/misc/irq-uclass.c
index 79eb7c200dc..ac778593c96 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(interrupt_parent, "#interrupt-cells", &count)) {
+			log_err("%s: could not get #interrupt-cells for %s\n",
+				__func__, dev->name);
+			return -ENOENT;
+		}
+
+		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);