[PATCH v1 01/11] hw/arm/ast27x0: Move DRAM and SDMC initialization earlier to support memory aliasing

[Jamin Lin via <qemu-arm@nongnu.org>]

To support DRAM aliasing for coprocessors (SSP/TSP), this commit moves the
initialization of the SDMC (SDRAM controller) and DRAM models earlier in
the device realization order.

In the upcoming changes, the PSP will expose a portion of its DRAM as shared
memory by creating a memory region alias at a specific offset. This alias is
mapped into the coprocessor's SDRAM address space, allowing both PSP and the
coprocessor (SSP/TSP) to access the same physical memory through their respective
views — PSP via its DRAM, and the coprocessor via its SDRAM.

The remapping is configured through SCU registers and enables shared memory
communication between PSP and the coprocessors.

Therefore, the DRAM and SDMC devices must be realized before:
  - the SCU, which configures the alias offset and size
  - the coprocessors, which access the alias through their SDRAM window

No functional change.

Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
---
 hw/arm/aspeed_ast27x0.c | 40 ++++++++++++++++++++--------------------
 1 file changed, 20 insertions(+), 20 deletions(-)

diff --git a/hw/arm/aspeed_ast27x0.c b/hw/arm/aspeed_ast27x0.c
index d17f446661..74a004adca 100644
--- a/hw/arm/aspeed_ast27x0.c
+++ b/hw/arm/aspeed_ast27x0.c
@@ -702,6 +702,26 @@ static void aspeed_soc_ast2700_realize(DeviceState *dev, Error **errp)
                            qdev_get_gpio_in(DEVICE(&a->intc[0].orgates[0]), i));
     }
 
+    /*
+     * SDMC - SDRAM Memory Controller
+     * The SDMC controller is unlocked at SPL stage.
+     * At present, only supports to emulate booting
+     * start from u-boot stage. Set SDMC controller
+     * unlocked by default. It is a temporarily solution.
+     */
+    object_property_set_bool(OBJECT(&s->sdmc), "unlocked", true,
+                                 &error_abort);
+    if (!sysbus_realize(SYS_BUS_DEVICE(&s->sdmc), errp)) {
+        return;
+    }
+    aspeed_mmio_map(s->memory, SYS_BUS_DEVICE(&s->sdmc), 0,
+                    sc->memmap[ASPEED_DEV_SDMC]);
+
+    /* RAM */
+    if (!aspeed_soc_ast2700_dram_init(dev, errp)) {
+        return;
+    }
+
     /* SRAM */
     name = g_strdup_printf("aspeed.sram.%d", CPU(&a->cpu[0])->cpu_index);
     if (!memory_region_init_ram(&s->sram, OBJECT(s), name, sc->sram_size,
@@ -792,26 +812,6 @@ static void aspeed_soc_ast2700_realize(DeviceState *dev, Error **errp)
                                                       ASPEED_DEV_EHCI1 + i));
     }
 
-    /*
-     * SDMC - SDRAM Memory Controller
-     * The SDMC controller is unlocked at SPL stage.
-     * At present, only supports to emulate booting
-     * start from u-boot stage. Set SDMC controller
-     * unlocked by default. It is a temporarily solution.
-     */
-    object_property_set_bool(OBJECT(&s->sdmc), "unlocked", true,
-                                 &error_abort);
-    if (!sysbus_realize(SYS_BUS_DEVICE(&s->sdmc), errp)) {
-        return;
-    }
-    aspeed_mmio_map(s->memory, SYS_BUS_DEVICE(&s->sdmc), 0,
-                    sc->memmap[ASPEED_DEV_SDMC]);
-
-    /* RAM */
-    if (!aspeed_soc_ast2700_dram_init(dev, errp)) {
-        return;
-    }
-
     /* Net */
     for (i = 0; i < sc->macs_num; i++) {
         object_property_set_bool(OBJECT(&s->ftgmac100[i]), "aspeed", true,
-- 
2.43.0