[Qemu-devel] [PATCH target-arm v4 3/3] zynq_slcr: Implement CPU reset

[Peter Crosthwaite]

Implement the CPU reset function of the A9_CPU_RST_CTRL register
(offset 0x244).

Signed-off-by: Peter Crosthwaite <peter.crosthwa...@xilinx.com>
---
changed from v3:
Author reset
Use CPU reset rather than device reset
use extract32 rather than << &.
Removed halting functionality
changed from v2:
used device halting API instead of talking to the cpu.

 hw/misc/zynq_slcr.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/hw/misc/zynq_slcr.c b/hw/misc/zynq_slcr.c
index 83ffc3b..0f94e03 100644
--- a/hw/misc/zynq_slcr.c
+++ b/hw/misc/zynq_slcr.c
@@ -116,6 +116,8 @@ typedef enum {
   RESET_MAX
 } ResetValues;
 
+#define A9_CPU_RST_CTRL_RST_SHIFT 0
+
 #define TYPE_ZYNQ_SLCR "xilinx,zynq_slcr"
 #define ZYNQ_SLCR(obj) OBJECT_CHECK(ZynqSLCRState, (obj), TYPE_ZYNQ_SLCR)
 
@@ -349,6 +351,7 @@ static void zynq_slcr_write(void *opaque, hwaddr offset,
                           uint64_t val, unsigned size)
 {
     ZynqSLCRState *s = (ZynqSLCRState *)opaque;
+    int i;
 
     DB_PRINT("offset: %08x data: %08x\n", (unsigned)offset, (unsigned)val);
 
@@ -403,6 +406,15 @@ static void zynq_slcr_write(void *opaque, hwaddr offset,
                 goto bad_reg;
             }
             s->reset[(offset - 0x200) / 4] = val;
+            if (offset - 0x200 == A9_CPU * 4) { /* CPU Reset */
+                for (i = 0; i < NUM_CPUS && s->cpus[i]; ++i) {
+                    bool rst = extract32(val, A9_CPU_RST_CTRL_RST_SHIFT + i, 
1);
+                    if (rst) {
+                        DB_PRINT("resetting cpu %d\n", i);
+                        cpu_reset(s->cpus[i]);
+                    }
+                }
+            }
             break;
         case 0x300:
             s->apu_ctrl = val;
-- 
1.8.5.2