hw/arm: xlnx-versal-virt: Add AMD/Xilinx TRNG device

Connect the support for Versal True Random Number Generator
(TRNG) device.

Warning: unlike the TRNG component in a real device from the
Versal device familiy, the connected TRNG model is not of
cryptographic grade and is not intended for use cases when
cryptograpically strong TRNG is needed.

Signed-off-by: Tong Ho <tong.ho@amd.com>
Reviewed-by: Francisco Iglesias <frasse.iglesias@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20231031184611.3029156-3-tong.ho@amd.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

Author: Tong Ho

hw/arm/Kconfig

@@ -482,6 +482,7 @@ config XLNX_VERSAL
     select XLNX_BBRAM
     select XLNX_EFUSE_VERSAL
     select XLNX_USB_SUBSYS
+    select XLNX_VERSAL_TRNG
 
 config NPCM7XX
     bool

hw/arm/xlnx-versal.c

@@ -373,6 +373,21 @@ static void versal_create_rtc(Versal *s, qemu_irq *pic)
                        qdev_get_gpio_in(DEVICE(&s->pmc.apb_irq_orgate), 0));
 }
 
+static void versal_create_trng(Versal *s, qemu_irq *pic)
+{
+    SysBusDevice *sbd;
+    MemoryRegion *mr;
+
+    object_initialize_child(OBJECT(s), "trng", &s->pmc.trng,
+                            TYPE_XLNX_VERSAL_TRNG);
+    sbd = SYS_BUS_DEVICE(&s->pmc.trng);
+    sysbus_realize(sbd, &error_fatal);
+
+    mr = sysbus_mmio_get_region(sbd, 0);
+    memory_region_add_subregion(&s->mr_ps, MM_PMC_TRNG, mr);
+    sysbus_connect_irq(sbd, 0, pic[VERSAL_TRNG_IRQ]);
+}
+
 static void versal_create_xrams(Versal *s, qemu_irq *pic)
 {
     int nr_xrams = ARRAY_SIZE(s->lpd.xram.ctrl);
@@ -909,6 +924,7 @@ static void versal_realize(DeviceState *dev, Error **errp)
     versal_create_sds(s, pic);
     versal_create_pmc_apb_irq_orgate(s, pic);
     versal_create_rtc(s, pic);
+    versal_create_trng(s, pic);
     versal_create_xrams(s, pic);
     versal_create_bbram(s, pic);
     versal_create_efuse(s, pic);

include/hw/arm/xlnx-versal.h

@@ -30,6 +30,7 @@
 #include "hw/dma/xlnx_csu_dma.h"
 #include "hw/misc/xlnx-versal-crl.h"
 #include "hw/misc/xlnx-versal-pmc-iou-slcr.h"
+#include "hw/misc/xlnx-versal-trng.h"
 #include "hw/net/xlnx-versal-canfd.h"
 #include "hw/misc/xlnx-versal-cfu.h"
 #include "hw/misc/xlnx-versal-cframe-reg.h"
@@ -115,6 +116,7 @@ struct Versal {
         } iou;
 
         XlnxZynqMPRTC rtc;
+        XlnxVersalTRng trng;
         XlnxBBRam bbram;
         XlnxEFuse efuse;
         XlnxVersalEFuseCtrl efuse_ctrl;
@@ -159,6 +161,7 @@ struct Versal {
 #define VERSAL_OSPI_IRQ            124
 #define VERSAL_SD0_IRQ_0           126
 #define VERSAL_EFUSE_IRQ           139
+#define VERSAL_TRNG_IRQ            141
 #define VERSAL_RTC_ALARM_IRQ       142
 #define VERSAL_RTC_SECONDS_IRQ     143
 
@@ -328,4 +331,6 @@ struct Versal {
 #define MM_PMC_CRP_SIZE             0x10000
 #define MM_PMC_RTC                  0xf12a0000
 #define MM_PMC_RTC_SIZE             0x10000
+#define MM_PMC_TRNG                 0xf1230000
+#define MM_PMC_TRNG_SIZE            0x10000
 #endif