[PATCH 1/5] aspeed/smc: Restore default AHB window mapping at reset

["Cédric Le Goater" <clg@kaod.org>]

The current model only restores the Segment Register values but leaves
the previous CS mapping behind. Introduce a helper setting the
register value and mapping the region at the requested address. Use
this helper when a Segment register is set and at reset.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 hw/ssi/aspeed_smc.c | 32 +++++++++++++++++++++-----------
 1 file changed, 21 insertions(+), 11 deletions(-)

diff --git a/hw/ssi/aspeed_smc.c b/hw/ssi/aspeed_smc.c
index f0c7bbbad302..955ec21852ac 100644
--- a/hw/ssi/aspeed_smc.c
+++ b/hw/ssi/aspeed_smc.c
@@ -475,10 +475,26 @@ static bool aspeed_smc_flash_overlap(const AspeedSMCState *s,
     return false;
 }
 
+static void aspeed_smc_flash_set_segment_region(AspeedSMCState *s, int cs,
+                                                uint64_t regval)
+{
+    AspeedSMCFlash *fl = &s->flashes[cs];
+    AspeedSegments seg;
+
+    s->ctrl->reg_to_segment(s, regval, &seg);
+
+    memory_region_transaction_begin();
+    memory_region_set_size(&fl->mmio, seg.size);
+    memory_region_set_address(&fl->mmio, seg.addr - s->ctrl->flash_window_base);
+    memory_region_set_enabled(&fl->mmio, true);
+    memory_region_transaction_commit();
+
+    s->regs[R_SEG_ADDR0 + cs] = regval;
+}
+
 static void aspeed_smc_flash_set_segment(AspeedSMCState *s, int cs,
                                          uint64_t new)
 {
-    AspeedSMCFlash *fl = &s->flashes[cs];
     AspeedSegments seg;
 
     s->ctrl->reg_to_segment(s, new, &seg);
@@ -529,13 +545,7 @@ static void aspeed_smc_flash_set_segment(AspeedSMCState *s, int cs,
     aspeed_smc_flash_overlap(s, &seg, cs);
 
     /* All should be fine now to move the region */
-    memory_region_transaction_begin();
-    memory_region_set_size(&fl->mmio, seg.size);
-    memory_region_set_address(&fl->mmio, seg.addr - s->ctrl->flash_window_base);
-    memory_region_set_enabled(&fl->mmio, true);
-    memory_region_transaction_commit();
-
-    s->regs[R_SEG_ADDR0 + cs] = new;
+    aspeed_smc_flash_set_segment_region(s, cs, new);
 }
 
 static uint64_t aspeed_smc_flash_default_read(void *opaque, hwaddr addr,
@@ -897,10 +907,10 @@ static void aspeed_smc_reset(DeviceState *d)
         qemu_set_irq(s->cs_lines[i], true);
     }
 
-    /* setup default segment register values for all */
+    /* setup the default segment register values and regions for all */
     for (i = 0; i < s->ctrl->max_slaves; ++i) {
-        s->regs[R_SEG_ADDR0 + i] =
-            s->ctrl->segment_to_reg(s, &s->ctrl->segments[i]);
+        aspeed_smc_flash_set_segment_region(s, i,
+                    s->ctrl->segment_to_reg(s, &s->ctrl->segments[i]));
     }
 
     /* HW strapping flash type for the AST2600 controllers  */
-- 
2.21.0