[PATCH for-7.1 05/11] hw/misc: Store DRAM size in NPCM8XX GCR Module

[Hao Wu <wuhaotsh@google.com>]

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.

Signed-off-by: Hao Wu <wuhaotsh@google.com>
Reviwed-by: Titus Rwantare <titusr@google.com>
---
 hw/misc/npcm_gcr.c         | 33 ++++++++++++++++++++++++++++++---
 include/hw/misc/npcm_gcr.h |  1 +
 2 files changed, 31 insertions(+), 3 deletions(-)

diff --git a/hw/misc/npcm_gcr.c b/hw/misc/npcm_gcr.c
index 2349949599..14c298602a 100644
--- a/hw/misc/npcm_gcr.c
+++ b/hw/misc/npcm_gcr.c
@@ -267,7 +267,7 @@ static const struct MemoryRegionOps npcm_gcr_ops = {
     },
 };
 
-static void npcm_gcr_enter_reset(Object *obj, ResetType type)
+static void npcm7xx_gcr_enter_reset(Object *obj, ResetType type)
 {
     NPCMGCRState *s = NPCM_GCR(obj);
     NPCMGCRClass *c = NPCM_GCR_GET_CLASS(obj);
@@ -283,6 +283,23 @@ static void npcm_gcr_enter_reset(Object *obj, ResetType type)
     }
 }
 
+static void npcm8xx_gcr_enter_reset(Object *obj, ResetType type)
+{
+    NPCMGCRState *s = NPCM_GCR(obj);
+    NPCMGCRClass *c = NPCM_GCR_GET_CLASS(obj);
+
+    switch (type) {
+    case RESET_TYPE_COLD:
+        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;
+        break;
+    }
+}
+
 static void npcm_gcr_realize(DeviceState *dev, Error **errp)
 {
     ERRP_GUARD();
@@ -326,6 +343,14 @@ 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)
@@ -355,12 +380,10 @@ static Property npcm_gcr_properties[] = {
 
 static void npcm_gcr_class_init(ObjectClass *klass, void *data)
 {
-    ResettableClass *rc = RESETTABLE_CLASS(klass);
     DeviceClass *dc = DEVICE_CLASS(klass);
 
     dc->realize = npcm_gcr_realize;
     dc->vmsd = &vmstate_npcm_gcr;
-    rc->phases.enter = npcm_gcr_enter_reset;
 
     device_class_set_props(dc, npcm_gcr_properties);
 }
@@ -369,24 +392,28 @@ static void npcm7xx_gcr_class_init(ObjectClass *klass, void *data)
 {
     NPCMGCRClass *c = NPCM_GCR_CLASS(klass);
     DeviceClass *dc = DEVICE_CLASS(klass);
+    ResettableClass *rc = RESETTABLE_CLASS(klass);
 
     QEMU_BUILD_BUG_ON(NPCM7XX_GCR_REGS_END > NPCM_GCR_MAX_NR_REGS);
     QEMU_BUILD_BUG_ON(NPCM7XX_GCR_REGS_END != NPCM7XX_GCR_NR_REGS);
     dc->desc = "NPCM7xx System Global Control Registers";
     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);
 
     QEMU_BUILD_BUG_ON(NPCM8XX_GCR_REGS_END > NPCM_GCR_MAX_NR_REGS);
     QEMU_BUILD_BUG_ON(NPCM8XX_GCR_REGS_END != NPCM8XX_GCR_NR_REGS);
     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[] = {
diff --git a/include/hw/misc/npcm_gcr.h b/include/hw/misc/npcm_gcr.h
index ac3d781c2e..bd69199d51 100644
--- a/include/hw/misc/npcm_gcr.h
+++ b/include/hw/misc/npcm_gcr.h
@@ -39,6 +39,7 @@ typedef struct NPCMGCRState {
     uint32_t reset_pwron;
     uint32_t reset_mdlr;
     uint32_t reset_intcr3;
+    uint32_t reset_scrpad_b;
 } NPCMGCRState;
 
 typedef struct NPCMGCRClass {
-- 
2.35.1.1094.g7c7d902a7c-goog