[PATCH v4 02/21] hw/misc/aspeed_scu: Add separate reset handler for AST2700 SCUIO

[Jamin Lin <jamin_lin@aspeedtech.com>]

Introduce a dedicated reset handler for SCUIO.

Previously, SCU and SCUIO shared the same reset handler. This no longer
fits the AST2700 design, where SCU uses the Aspeed2700SCUState subclass
and will handle coprocessor-related control in future changes.

Since these controls are defined in SCU (not SCUIO), SCU and SCUIO
should not share the same reset logic.

This change gives SCUIO its own reset handler and prepares for upcoming
SCU-specific functionality.

No functional change.

Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
---
 hw/misc/aspeed_scu.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/hw/misc/aspeed_scu.c b/hw/misc/aspeed_scu.c
index 0a2dad4537..51696443bd 100644
--- a/hw/misc/aspeed_scu.c
+++ b/hw/misc/aspeed_scu.c
@@ -1084,13 +1084,23 @@ static const uint32_t ast2700_a0_resets_io[ASPEED_AST2700_SCU_NR_REGS] = {
     [AST2700_SCUIO_FREQ_CNT_CTL]        = 0x00000080,
 };
 
+static void aspeed_ast2700_scuio_reset(DeviceState *dev)
+{
+    AspeedSCUState *s = ASPEED_SCU(dev);
+    AspeedSCUClass *asc = ASPEED_SCU_GET_CLASS(dev);
+
+    memcpy(s->regs, asc->resets, asc->nr_regs * 4);
+    s->regs[AST2700_SILICON_REV] = s->silicon_rev;
+    s->regs[AST2700_HW_STRAP1] = s->hw_strap1;
+}
+
 static void aspeed_2700_scuio_class_init(ObjectClass *klass, const void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     AspeedSCUClass *asc = ASPEED_SCU_CLASS(klass);
 
     dc->desc = "ASPEED 2700 System Control Unit I/O";
-    device_class_set_legacy_reset(dc, aspeed_ast2700_scu_reset);
+    device_class_set_legacy_reset(dc, aspeed_ast2700_scuio_reset);
     asc->resets = ast2700_a0_resets_io;
     asc->calc_hpll = aspeed_2600_scu_calc_hpll;
     asc->get_apb = aspeed_2700_scuio_get_apb_freq;
-- 
2.43.0