[Qemu-devel] [PATCH v3 06/16] register: QOMify

[Alistair Francis]

From: Peter Crosthwaite <peter.crosthwa...@xilinx.com>

QOMify registers as a child of TYPE_DEVICE. This allows registers to
define GPIOs.

Define an init helper that will do QOM initialisation as well as setup
the r/w fast paths.

Signed-off-by: Peter Crosthwaite <peter.crosthwa...@xilinx.com>
Signed-off-by: Alistair Francis <alistair.fran...@xilinx.com>
Reviewed-by: KONRAD Frederic <fred.kon...@greensocs.com>
---

 hw/core/register.c    | 34 ++++++++++++++++++++++++++++++++++
 include/hw/register.h | 14 ++++++++++++++
 2 files changed, 48 insertions(+)

diff --git a/hw/core/register.c b/hw/core/register.c
index e696c43..939f398 100644
--- a/hw/core/register.c
+++ b/hw/core/register.c
@@ -188,6 +188,28 @@ void register_reset(RegisterInfo *reg)
     register_write_val(reg, reg->access->reset);
 }
 
+void register_init(RegisterInfo *reg)
+{
+    assert(reg);
+    const RegisterAccessInfo *ac;
+
+    if (!reg->data || !reg->access) {
+        return;
+    }
+
+    object_initialize((void *)reg, sizeof(*reg), TYPE_REGISTER);
+
+    ac = reg->access;
+
+    /* if there are no debug msgs and no RMW requirement, mark for fast write 
*/
+    reg->write_lite = reg->debug || ac->ro || ac->w1c || ac->pre_write ||
+            ((ac->ge0 || ac->ge1) && qemu_loglevel_mask(LOG_GUEST_ERROR)) ||
+            ((ac->ui0 || ac->ui1) && qemu_loglevel_mask(LOG_UNIMP))
+             ? false : true;
+    /* no debug and no clear-on-read is a fast read */
+    reg->read_lite = reg->debug || ac->cor ? false : true;
+}
+
 static inline void register_write_memory(void *opaque, hwaddr addr,
                                          uint64_t value, unsigned size, bool 
be)
 {
@@ -235,3 +257,15 @@ uint64_t register_read_memory_le(void *opaque, hwaddr 
addr, unsigned size)
 {
     return register_read_memory(opaque, addr, size, false);
 }
+
+static const TypeInfo register_info = {
+    .name  = TYPE_REGISTER,
+    .parent = TYPE_DEVICE,
+};
+
+static void register_register_types(void)
+{
+    type_register_static(&register_info);
+}
+
+type_init(register_register_types)
diff --git a/include/hw/register.h b/include/hw/register.h
index 38ee6f5..3316458 100644
--- a/include/hw/register.h
+++ b/include/hw/register.h
@@ -11,6 +11,7 @@
 #ifndef REGISTER_H
 #define REGISTER_H
 
+#include "hw/qdev-core.h"
 #include "exec/memory.h"
 
 typedef struct RegisterInfo RegisterInfo;
@@ -101,6 +102,8 @@ struct RegisterAccessInfo {
 
 struct RegisterInfo {
     /* <private> */
+    DeviceState parent_obj;
+
     bool read_lite;
     bool write_lite;
 
@@ -118,6 +121,9 @@ struct RegisterInfo {
     void *opaque;
 };
 
+#define TYPE_REGISTER "qemu,register"
+#define REGISTER(obj) OBJECT_CHECK(RegisterInfo, (obj), TYPE_REGISTER)
+
 /**
  * write a value to a register, subject to its restrictions
  * @reg: register to write to
@@ -143,6 +149,14 @@ uint64_t register_read(RegisterInfo *reg);
 void register_reset(RegisterInfo *reg);
 
 /**
+ * Initialize a register. GPIO's are setup as IOs to the specified device.
+ * Fast paths for eligible registers are enabled.
+ * @reg: Register to initialize
+ */
+
+void register_init(RegisterInfo *reg);
+
+/**
  * Memory API MMIO write handler that will write to a Register API register.
  *  _be for big endian variant and _le for little endian.
  * @opaque: RegisterInfo to write to
-- 
2.5.0