Introduce a model of Xilinx Versal's Configuration Frame Unit's Single
Frame Read port (CFU_SFR).

Signed-off-by: Francisco Iglesias <francisco.iglesias@amd.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
---
 hw/misc/xlnx-versal-cfu.c         | 87 +++++++++++++++++++++++++++++++
 include/hw/misc/xlnx-versal-cfu.h | 15 ++++++
 2 files changed, 102 insertions(+)

diff --git a/hw/misc/xlnx-versal-cfu.c b/hw/misc/xlnx-versal-cfu.c
index 255c1bf4b8..8e588ac1d8 100644
--- a/hw/misc/xlnx-versal-cfu.c
+++ b/hw/misc/xlnx-versal-cfu.c
@@ -264,6 +264,31 @@ static void cfu_stream_write(void *opaque, hwaddr addr, uint64_t value,
     }
 }
 
+static uint64_t cfu_sfr_read(void *opaque, hwaddr addr, unsigned size)
+{
+    qemu_log_mask(LOG_GUEST_ERROR, "%s: Unsupported read from addr=%"
+                  HWADDR_PRIx "\n", __func__, addr);
+    return 0;
+}
+
+static void cfu_sfr_write(void *opaque, hwaddr addr, uint64_t value,
+                      unsigned size)
+{
+    XlnxVersalCFUSFR *s = XLNX_VERSAL_CFU_SFR(opaque);
+    uint32_t wfifo[WFIFO_SZ];
+
+    if (update_wfifo(addr, value, s->wfifo, wfifo)) {
+        uint8_t row_addr = extract32(wfifo[0], 23, 5);
+        uint32_t frame_addr = extract32(wfifo[0], 0, 23);
+        XlnxCfiPacket pkt = { .reg_addr = CFRAME_SFR,
+                              .data[0] = frame_addr };
+
+        if (s->cfg.cfu) {
+            cfu_transfer_cfi_packet(s->cfg.cfu, row_addr, &pkt);
+        }
+    }
+}
+
 static uint64_t cfu_fdro_read(void *opaque, hwaddr addr, unsigned size)
 {
     XlnxVersalCFUFDRO *s = XLNX_VERSAL_CFU_FDRO(opaque);
@@ -293,6 +318,16 @@ static const MemoryRegionOps cfu_stream_ops = {
     },
 };
 
+static const MemoryRegionOps cfu_sfr_ops = {
+    .read = cfu_sfr_read,
+    .write = cfu_sfr_write,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+    .valid = {
+        .min_access_size = 4,
+        .max_access_size = 4,
+    },
+};
+
 static const MemoryRegionOps cfu_fdro_ops = {
     .read = cfu_fdro_read,
     .write = cfu_fdro_write,
@@ -334,6 +369,23 @@ static void cfu_apb_init(Object *obj)
     sysbus_init_irq(sbd, &s->irq_cfu_imr);
 }
 
+static void cfu_sfr_init(Object *obj)
+{
+    XlnxVersalCFUSFR *s = XLNX_VERSAL_CFU_SFR(obj);
+    SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
+
+    memory_region_init_io(&s->iomem_sfr, obj, &cfu_sfr_ops, s,
+                          TYPE_XLNX_VERSAL_CFU_SFR, KEYHOLE_STREAM_4K);
+    sysbus_init_mmio(sbd, &s->iomem_sfr);
+}
+
+static void cfu_sfr_reset_enter(Object *obj, ResetType type)
+{
+    XlnxVersalCFUSFR *s = XLNX_VERSAL_CFU_SFR(obj);
+
+    memset(s->wfifo, 0, WFIFO_SZ * sizeof(uint32_t));
+}
+
 static void cfu_fdro_init(Object *obj)
 {
     XlnxVersalCFUFDRO *s = XLNX_VERSAL_CFU_FDRO(obj);
@@ -401,6 +453,12 @@ static Property cfu_props[] = {
         DEFINE_PROP_END_OF_LIST(),
 };
 
+static Property cfu_sfr_props[] = {
+        DEFINE_PROP_LINK("cfu", XlnxVersalCFUSFR, cfg.cfu,
+                         TYPE_XLNX_VERSAL_CFU_APB, XlnxVersalCFUAPB *),
+        DEFINE_PROP_END_OF_LIST(),
+};
+
 static const VMStateDescription vmstate_cfu_apb = {
     .name = TYPE_XLNX_VERSAL_CFU_APB,
     .version_id = 1,
@@ -423,6 +481,16 @@ static const VMStateDescription vmstate_cfu_fdro = {
     }
 };
 
+static const VMStateDescription vmstate_cfu_sfr = {
+    .name = TYPE_XLNX_VERSAL_CFU_SFR,
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT32_ARRAY(wfifo, XlnxVersalCFUSFR, 4),
+        VMSTATE_END_OF_LIST(),
+    }
+};
+
 static void cfu_apb_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
@@ -443,6 +511,16 @@ static void cfu_fdro_class_init(ObjectClass *klass, void *data)
     rc->phases.enter = cfu_fdro_reset_enter;
 }
 
+static void cfu_sfr_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    ResettableClass *rc = RESETTABLE_CLASS(klass);
+
+    device_class_set_props(dc, cfu_sfr_props);
+    dc->vmsd = &vmstate_cfu_sfr;
+    rc->phases.enter = cfu_sfr_reset_enter;
+}
+
 static const TypeInfo cfu_apb_info = {
     .name          = TYPE_XLNX_VERSAL_CFU_APB,
     .parent        = TYPE_SYS_BUS_DEVICE,
@@ -467,10 +545,19 @@ static const TypeInfo cfu_fdro_info = {
     }
 };
 
+static const TypeInfo cfu_sfr_info = {
+    .name          = TYPE_XLNX_VERSAL_CFU_SFR,
+    .parent        = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(XlnxVersalCFUSFR),
+    .class_init    = cfu_sfr_class_init,
+    .instance_init = cfu_sfr_init,
+};
+
 static void cfu_apb_register_types(void)
 {
     type_register_static(&cfu_apb_info);
     type_register_static(&cfu_fdro_info);
+    type_register_static(&cfu_sfr_info);
 }
 
 type_init(cfu_apb_register_types)
diff --git a/include/hw/misc/xlnx-versal-cfu.h b/include/hw/misc/xlnx-versal-cfu.h
index 73e9a21af4..86fb841053 100644
--- a/include/hw/misc/xlnx-versal-cfu.h
+++ b/include/hw/misc/xlnx-versal-cfu.h
@@ -28,6 +28,9 @@ OBJECT_DECLARE_SIMPLE_TYPE(XlnxVersalCFUAPB, XLNX_VERSAL_CFU_APB)
 #define TYPE_XLNX_VERSAL_CFU_FDRO "xlnx,versal-cfu-fdro"
 OBJECT_DECLARE_SIMPLE_TYPE(XlnxVersalCFUFDRO, XLNX_VERSAL_CFU_FDRO)
 
+#define TYPE_XLNX_VERSAL_CFU_SFR "xlnx,versal-cfu-sfr"
+OBJECT_DECLARE_SIMPLE_TYPE(XlnxVersalCFUSFR, XLNX_VERSAL_CFU_SFR)
+
 REG32(CFU_ISR, 0x0)
     FIELD(CFU_ISR, USR_GTS_EVENT, 9, 1)
     FIELD(CFU_ISR, USR_GSR_EVENT, 8, 1)
@@ -222,6 +225,18 @@ struct XlnxVersalCFUFDRO {
     Fifo32 fdro_data;
 };
 
+struct XlnxVersalCFUSFR {
+    SysBusDevice parent_obj;
+    MemoryRegion iomem_sfr;
+
+    /* 128-bit wfifo. */
+    uint32_t wfifo[WFIFO_SZ];
+
+    struct {
+        XlnxVersalCFUAPB *cfu;
+    } cfg;
+};
+
 /**
  * This is a helper function for updating a CFI data write fifo, an array of 4
  * uint32_t and 128 bits of data that are allowed to be written through 4
-- 
2.34.1