[PATCH v6 06/12] hw/dma/xlnx_csu_dma: Implement the DMA control interface

[Francisco Iglesias <francisco.iglesias@xilinx.com>]

Implement the DMA control interface for allowing direct control of DMA
operations from inside peripheral models embedding (and reusing) the
Xilinx CSU DMA.

Signed-off-by: Francisco Iglesias <francisco.iglesias@xilinx.com>
---
 hw/dma/xlnx_csu_dma.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/hw/dma/xlnx_csu_dma.c b/hw/dma/xlnx_csu_dma.c
index 896bb3574d..58860d9f19 100644
--- a/hw/dma/xlnx_csu_dma.c
+++ b/hw/dma/xlnx_csu_dma.c
@@ -30,6 +30,7 @@
 #include "hw/stream.h"
 #include "hw/register.h"
 #include "hw/dma/xlnx_csu_dma.h"
+#include "hw/dma/dma-ctrl-if.h"
 
 /*
  * Ref: UG1087 (v1.7) February 8, 2019
@@ -472,6 +473,21 @@ static uint64_t addr_msb_pre_write(RegisterInfo *reg, uint64_t val)
     return val & R_ADDR_MSB_ADDR_MSB_MASK;
 }
 
+static MemTxResult xlnx_csu_dma_dma_ctrl_if_read(DmaCtrlIf *dma, hwaddr addr,
+                                                 uint32_t len)
+{
+    XlnxCSUDMA *s = XLNX_CSU_DMA(dma);
+    RegisterInfo *reg = &s->regs_info[R_SIZE];
+    uint64_t we = MAKE_64BIT_MASK(0, 4 * 8);
+
+    s->regs[R_ADDR] = addr;
+    s->regs[R_ADDR_MSB] = (uint64_t)addr >> 32;
+
+    register_write(reg, len, we, object_get_typename(OBJECT(s)), false);
+
+    return (s->regs[R_SIZE] == 0) ? MEMTX_OK : MEMTX_ERROR;
+}
+
 static const RegisterAccessInfo *xlnx_csu_dma_regs_info[] = {
 #define DMACH_REGINFO(NAME, snd)                                              \
     (const RegisterAccessInfo []) {                                           \
@@ -696,6 +712,7 @@ static void xlnx_csu_dma_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     StreamSinkClass *ssc = STREAM_SINK_CLASS(klass);
+    DmaCtrlIfClass *dcic = DMA_CTRL_IF_CLASS(klass);
 
     dc->reset = xlnx_csu_dma_reset;
     dc->realize = xlnx_csu_dma_realize;
@@ -704,6 +721,8 @@ static void xlnx_csu_dma_class_init(ObjectClass *klass, void *data)
 
     ssc->push = xlnx_csu_dma_stream_push;
     ssc->can_push = xlnx_csu_dma_stream_can_push;
+
+    dcic->read = xlnx_csu_dma_dma_ctrl_if_read;
 }
 
 static void xlnx_csu_dma_init(Object *obj)
@@ -731,6 +750,7 @@ static const TypeInfo xlnx_csu_dma_info = {
     .instance_init = xlnx_csu_dma_init,
     .interfaces = (InterfaceInfo[]) {
         { TYPE_STREAM_SINK },
+        { TYPE_DMA_CTRL_IF },
         { }
     }
 };
-- 
2.11.0