hw/arm: xlnx-zcu102: Add Xilinx eFUSE device

Connect the support for ZynqMP eFUSE one-time field-programmable
bit array.

The command argument:
  -drive if=pflash,index=3,...
Can be used to optionally connect the bit array to a
backend storage, such that field-programmed values
in one invocation can be made available to next
invocation.

The backend storage must be a seekable binary file, and
its size must be 768 bytes or larger. A file with all
binary 0's is a 'blank'.

Signed-off-by: Tong Ho <tong.ho@xilinx.com>
Message-id: 20210917052400.1249094-9-tong.ho@xilinx.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

3 files changed, 45 insertions, 0 deletions

diff --git a/hw/Kconfig b/hw/Kconfig
index b6fb6a4..ad20cce 100644
--- a/hw/Kconfig
+++ b/hw/Kconfig
@@ -82,3 +82,4 @@ config XLNX_ZYNQMP
     select CAN_BUS
     select PTIMER
     select XLNX_BBRAM
+    select XLNX_EFUSE_ZYNQMP
diff --git a/hw/arm/xlnx-zcu102.c b/hw/arm/xlnx-zcu102.c
index b247c57..3dc2b5e 100644
--- a/hw/arm/xlnx-zcu102.c
+++ b/hw/arm/xlnx-zcu102.c
@@ -110,6 +110,18 @@ static void bbram_attach_drive(XlnxBBRam *dev)
     }
 }
 
+static void efuse_attach_drive(XlnxEFuse *dev)
+{
+    DriveInfo *dinfo;
+    BlockBackend *blk;
+
+    dinfo = drive_get_by_index(IF_PFLASH, 3);
+    blk = dinfo ? blk_by_legacy_dinfo(dinfo) : NULL;
+    if (blk) {
+        qdev_prop_set_drive(DEVICE(dev), "drive", blk);
+    }
+}
+
 static void xlnx_zcu102_init(MachineState *machine)
 {
     XlnxZCU102 *s = ZCU102_MACHINE(machine);
@@ -151,6 +163,9 @@ static void xlnx_zcu102_init(MachineState *machine)
     /* Attach bbram backend, if given */
     bbram_attach_drive(&s->soc.bbram);
 
+    /* Attach efuse backend, if given */
+    efuse_attach_drive(&s->soc.efuse);
+
     /* Create and plug in the SD cards */
     for (i = 0; i < XLNX_ZYNQMP_NUM_SDHCI; i++) {
         BusState *bus;
diff --git a/hw/arm/xlnx-zynqmp.c b/hw/arm/xlnx-zynqmp.c
index 1e8e2dd..1c52a57 100644
--- a/hw/arm/xlnx-zynqmp.c
+++ b/hw/arm/xlnx-zynqmp.c
@@ -69,6 +69,9 @@
 #define BBRAM_ADDR          0xffcd0000
 #define BBRAM_IRQ           11
 
+#define EFUSE_ADDR          0xffcc0000
+#define EFUSE_IRQ           87
+
 #define SDHCI_CAPABILITIES  0x280737ec6481 /* Datasheet: UG1085 (v1.7) */
 
 static const uint64_t gem_addr[XLNX_ZYNQMP_NUM_GEMS] = {
@@ -245,6 +248,31 @@ static void xlnx_zynqmp_create_bbram(XlnxZynqMPState *s, qemu_irq *gic)
     sysbus_connect_irq(sbd, 0, gic[BBRAM_IRQ]);
 }
 
+static void xlnx_zynqmp_create_efuse(XlnxZynqMPState *s, qemu_irq *gic)
+{
+    Object *bits = OBJECT(&s->efuse);
+    Object *ctrl = OBJECT(&s->efuse_ctrl);
+    SysBusDevice *sbd;
+
+    object_initialize_child(OBJECT(s), "efuse-ctrl", &s->efuse_ctrl,
+                            TYPE_XLNX_ZYNQMP_EFUSE);
+
+    object_initialize_child_with_props(ctrl, "xlnx-efuse@0", bits,
+                                       sizeof(s->efuse),
+                                       TYPE_XLNX_EFUSE, &error_abort,
+                                       "efuse-nr", "3",
+                                       "efuse-size", "2048",
+                                       NULL);
+
+    qdev_realize(DEVICE(bits), NULL, &error_abort);
+    object_property_set_link(ctrl, "efuse", bits, &error_abort);
+
+    sbd = SYS_BUS_DEVICE(ctrl);
+    sysbus_realize(sbd, &error_abort);
+    sysbus_mmio_map(sbd, 0, EFUSE_ADDR);
+    sysbus_connect_irq(sbd, 0, gic[EFUSE_IRQ]);
+}
+
 static void xlnx_zynqmp_create_unimp_mmio(XlnxZynqMPState *s)
 {
     static const struct UnimpInfo {
@@ -646,6 +674,7 @@ static void xlnx_zynqmp_realize(DeviceState *dev, Error **errp)
     sysbus_connect_irq(SYS_BUS_DEVICE(&s->rtc), 0, gic_spi[RTC_IRQ]);
 
     xlnx_zynqmp_create_bbram(s, gic_spi);
+    xlnx_zynqmp_create_efuse(s, gic_spi);
     xlnx_zynqmp_create_unimp_mmio(s);
 
     for (i = 0; i < XLNX_ZYNQMP_NUM_GDMA_CH; i++) {