hw/misc: Store DRAM size in NPCM8XX GCR Module

NPCM8XX boot block stores the DRAM size in SCRPAD_B register in GCR
module. Since we don't simulate a detailed memory controller, we
need to store this information directly similar to the NPCM7XX's
INCTR3 register.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Hao Wu <wuhaotsh@google.com>
Message-id: 20250219184609.1839281-9-wuhaotsh@google.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 24 insertions, 0 deletions

diff --git a/hw/misc/npcm_gcr.c b/hw/misc/npcm_gcr.c
index ac22fb08cb..9e4a6aee61 100644
--- a/hw/misc/npcm_gcr.c
+++ b/hw/misc/npcm_gcr.c
@@ -280,6 +280,19 @@ static void npcm7xx_gcr_enter_reset(Object *obj, ResetType type)
     s->regs[NPCM7XX_GCR_INTCR3] = s->reset_intcr3;
 }
 
+static void npcm8xx_gcr_enter_reset(Object *obj, ResetType type)
+{
+    NPCMGCRState *s = NPCM_GCR(obj);
+    NPCMGCRClass *c = NPCM_GCR_GET_CLASS(obj);
+
+    memcpy(s->regs, c->cold_reset_values, c->nr_regs * sizeof(uint32_t));
+    /* These 3 registers are at the same location in both 7xx and 8xx. */
+    s->regs[NPCM8XX_GCR_PWRON] = s->reset_pwron;
+    s->regs[NPCM8XX_GCR_MDLR] = s->reset_mdlr;
+    s->regs[NPCM8XX_GCR_INTCR3] = s->reset_intcr3;
+    s->regs[NPCM8XX_GCR_SCRPAD_B] = s->reset_scrpad_b;
+}
+
 static void npcm_gcr_realize(DeviceState *dev, Error **errp)
 {
     ERRP_GUARD();
@@ -323,6 +336,14 @@ static void npcm_gcr_realize(DeviceState *dev, Error **errp)
      * https://github.com/Nuvoton-Israel/u-boot/blob/2aef993bd2aafeb5408dbaad0f3ce099ee40c4aa/board/nuvoton/poleg/poleg.c#L244
      */
     s->reset_intcr3 |= ctz64(dram_size / NPCM7XX_GCR_MIN_DRAM_SIZE) << 8;
+
+    /*
+     * The boot block starting from 0.0.6 for NPCM8xx SoCs stores the DRAM size
+     * in the SCRPAD2 registers. We need to set this field correctly since
+     * the initialization is skipped as we mentioned above.
+     * https://github.com/Nuvoton-Israel/u-boot/blob/npcm8mnx-v2019.01_tmp/board/nuvoton/arbel/arbel.c#L737
+     */
+    s->reset_scrpad_b = dram_size;
 }
 
 static void npcm_gcr_init(Object *obj)
@@ -370,16 +391,19 @@ static void npcm7xx_gcr_class_init(ObjectClass *klass, void *data)
 
     c->nr_regs = NPCM7XX_GCR_NR_REGS;
     c->cold_reset_values = npcm7xx_cold_reset_values;
+    rc->phases.enter = npcm7xx_gcr_enter_reset;
 }
 
 static void npcm8xx_gcr_class_init(ObjectClass *klass, void *data)
 {
     NPCMGCRClass *c = NPCM_GCR_CLASS(klass);
     DeviceClass *dc = DEVICE_CLASS(klass);
+    ResettableClass *rc = RESETTABLE_CLASS(klass);
 
     dc->desc = "NPCM8xx System Global Control Registers";
     c->nr_regs = NPCM8XX_GCR_NR_REGS;
     c->cold_reset_values = npcm8xx_cold_reset_values;
+    rc->phases.enter = npcm8xx_gcr_enter_reset;
 }
 
 static const TypeInfo npcm_gcr_info[] = {