[PULL 39/62] hw/arm/xlnx-versal: add the target field in IRQ descriptor

[Peter Maydell <peter.maydell@linaro.org>]

From: Luc Michel <luc.michel@amd.com>

Add the target field in the IRQ descriptor. This allows to target an IRQ
to another IRQ controller than the GIC(s). Other supported targets are
the PMC PPU1 CPU interrupt controller and the EAM (Error management)
device. Those two devices are currently not implemented so IRQs
targeting those will be left unconnected. This is in preparation for
versal2.

Signed-off-by: Luc Michel <luc.michel@amd.com>
Reviewed-by: Francisco Iglesias <francisco.iglesias@amd.com>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@amd.com>
Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20250926070806.292065-39-luc.michel@amd.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 hw/arm/xlnx-versal.c | 41 +++++++++++++++++++++++++++++++++++++++--
 1 file changed, 39 insertions(+), 2 deletions(-)

diff --git a/hw/arm/xlnx-versal.c b/hw/arm/xlnx-versal.c
index 3d960ed2636..64744401182 100644
--- a/hw/arm/xlnx-versal.c
+++ b/hw/arm/xlnx-versal.c
@@ -52,14 +52,26 @@
 
 /*
  * IRQ descriptor to catch the following cases:
+ *   - An IRQ can either connect to the GICs, to the PPU1 intc, or the the EAM
  *   - Multiple devices can connect to the same IRQ. They are OR'ed together.
  */
 FIELD(VERSAL_IRQ, IRQ, 0, 16)
+FIELD(VERSAL_IRQ, TARGET, 16, 2)
 FIELD(VERSAL_IRQ, ORED, 18, 1)
 FIELD(VERSAL_IRQ, OR_IDX, 19, 4) /* input index on the IRQ OR gate */
 
+typedef enum VersalIrqTarget {
+    IRQ_TARGET_GIC,
+    IRQ_TARGET_PPU1,
+    IRQ_TARGET_EAM,
+} VersalIrqTarget;
+
+#define PPU1_IRQ(irq) ((IRQ_TARGET_PPU1 << R_VERSAL_IRQ_TARGET_SHIFT) | (irq))
+#define EAM_IRQ(irq) ((IRQ_TARGET_EAM << R_VERSAL_IRQ_TARGET_SHIFT) | (irq))
 #define OR_IRQ(irq, or_idx) \
     (R_VERSAL_IRQ_ORED_MASK | ((or_idx) << R_VERSAL_IRQ_OR_IDX_SHIFT) | (irq))
+#define PPU1_OR_IRQ(irq, or_idx) \
+    ((IRQ_TARGET_PPU1 << R_VERSAL_IRQ_TARGET_SHIFT) | OR_IRQ(irq, or_idx))
 
 typedef struct VersalSimplePeriphMap {
     uint64_t addr;
@@ -414,6 +426,13 @@ static qemu_irq versal_get_gic_irq(Versal *s, int irq_idx)
 static qemu_irq versal_get_irq_or_gate_in(Versal *s, int irq_idx,
                                           qemu_irq target_irq)
 {
+    static const char *TARGET_STR[] = {
+        [IRQ_TARGET_GIC] = "gic",
+        [IRQ_TARGET_PPU1] = "ppu1",
+        [IRQ_TARGET_EAM] = "eam",
+    };
+
+    VersalIrqTarget target;
     Object *container = versal_get_child(s, "irq-or-gates");
     DeviceState *dev;
     g_autofree char *name;
@@ -421,8 +440,9 @@ static qemu_irq versal_get_irq_or_gate_in(Versal *s, int irq_idx,
 
     idx = FIELD_EX32(irq_idx, VERSAL_IRQ, IRQ);
     or_idx = FIELD_EX32(irq_idx, VERSAL_IRQ, OR_IDX);
+    target = FIELD_EX32(irq_idx, VERSAL_IRQ, TARGET);
 
-    name = g_strdup_printf("irq[%d]", idx);
+    name = g_strdup_printf("%s-irq[%d]", TARGET_STR[target], idx);
     dev = DEVICE(object_resolve_path_at(container, name));
 
     if (dev == NULL) {
@@ -438,12 +458,29 @@ static qemu_irq versal_get_irq_or_gate_in(Versal *s, int irq_idx,
 
 static qemu_irq versal_get_irq(Versal *s, int irq_idx)
 {
+    VersalIrqTarget target;
     qemu_irq irq;
     bool ored;
 
+    target = FIELD_EX32(irq_idx, VERSAL_IRQ, TARGET);
     ored = FIELD_EX32(irq_idx, VERSAL_IRQ, ORED);
 
-    irq = versal_get_gic_irq(s, irq_idx);
+    switch (target) {
+    case IRQ_TARGET_EAM:
+        /* EAM not implemented */
+        return NULL;
+
+    case IRQ_TARGET_PPU1:
+        /* PPU1 CPU not implemented */
+        return NULL;
+
+    case IRQ_TARGET_GIC:
+        irq = versal_get_gic_irq(s, irq_idx);
+        break;
+
+    default:
+        g_assert_not_reached();
+    }
 
     if (ored) {
         irq = versal_get_irq_or_gate_in(s, irq_idx, irq);
-- 
2.43.0