riscv: Initial commit of OpenTitan machine

This adds a barebone OpenTitan machine to QEMU.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Bin Meng <bin.meng@windriver.com>

3 files changed, 190 insertions, 0 deletions

diff --git a/hw/riscv/Kconfig b/hw/riscv/Kconfig
index ff9fbe958a..94d19571f7 100644
--- a/hw/riscv/Kconfig
+++ b/hw/riscv/Kconfig
@@ -27,6 +27,11 @@ config SPIKE
     select HTIF
     select SIFIVE
 
+config OPENTITAN
+    bool
+    select HART
+    select UNIMP
+
 config RISCV_VIRT
     bool
     imply PCI_DEVICES
diff --git a/hw/riscv/Makefile.objs b/hw/riscv/Makefile.objs
index fc3c6dd7c8..57cc708f5d 100644
--- a/hw/riscv/Makefile.objs
+++ b/hw/riscv/Makefile.objs
@@ -1,6 +1,7 @@
 obj-y += boot.o
 obj-$(CONFIG_SPIKE) += riscv_htif.o
 obj-$(CONFIG_HART) += riscv_hart.o
+obj-$(CONFIG_OPENTITAN) += opentitan.o
 obj-$(CONFIG_SIFIVE_E) += sifive_e.o
 obj-$(CONFIG_SIFIVE_E) += sifive_e_prci.o
 obj-$(CONFIG_SIFIVE) += sifive_clint.o
diff --git a/hw/riscv/opentitan.c b/hw/riscv/opentitan.c
new file mode 100644
index 0000000000..b4fb836466
--- /dev/null
+++ b/hw/riscv/opentitan.c
@@ -0,0 +1,184 @@
+/*
+ * QEMU RISC-V Board Compatible with OpenTitan FPGA platform
+ *
+ * Copyright (c) 2020 Western Digital
+ *
+ * Provides a board compatible with the OpenTitan FPGA platform:
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2 or later, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "qemu/osdep.h"
+#include "hw/riscv/opentitan.h"
+#include "qapi/error.h"
+#include "hw/boards.h"
+#include "hw/misc/unimp.h"
+#include "hw/riscv/boot.h"
+#include "exec/address-spaces.h"
+
+static const struct MemmapEntry {
+    hwaddr base;
+    hwaddr size;
+} ibex_memmap[] = {
+    [IBEX_ROM] =            {  0x00008000,   0xc000 },
+    [IBEX_RAM] =            {  0x10000000,  0x10000 },
+    [IBEX_FLASH] =          {  0x20000000,  0x80000 },
+    [IBEX_UART] =           {  0x40000000,  0x10000 },
+    [IBEX_GPIO] =           {  0x40010000,  0x10000 },
+    [IBEX_SPI] =            {  0x40020000,  0x10000 },
+    [IBEX_FLASH_CTRL] =     {  0x40030000,  0x10000 },
+    [IBEX_PINMUX] =         {  0x40070000,  0x10000 },
+    [IBEX_RV_TIMER] =       {  0x40080000,  0x10000 },
+    [IBEX_PLIC] =           {  0x40090000,  0x10000 },
+    [IBEX_PWRMGR] =         {  0x400A0000,  0x10000 },
+    [IBEX_RSTMGR] =         {  0x400B0000,  0x10000 },
+    [IBEX_CLKMGR] =         {  0x400C0000,  0x10000 },
+    [IBEX_AES] =            {  0x40110000,  0x10000 },
+    [IBEX_HMAC] =           {  0x40120000,  0x10000 },
+    [IBEX_ALERT_HANDLER] =  {  0x40130000,  0x10000 },
+    [IBEX_NMI_GEN] =        {  0x40140000,  0x10000 },
+    [IBEX_USBDEV] =         {  0x40150000,  0x10000 },
+    [IBEX_PADCTRL] =        {  0x40160000,  0x10000 }
+};
+
+static void riscv_opentitan_init(MachineState *machine)
+{
+    const struct MemmapEntry *memmap = ibex_memmap;
+    OpenTitanState *s = g_new0(OpenTitanState, 1);
+    MemoryRegion *sys_mem = get_system_memory();
+    MemoryRegion *main_mem = g_new(MemoryRegion, 1);
+
+    /* Initialize SoC */
+    object_initialize_child(OBJECT(machine), "soc", &s->soc,
+                            sizeof(s->soc), TYPE_RISCV_IBEX_SOC,
+                            &error_abort, NULL);
+    object_property_set_bool(OBJECT(&s->soc), true, "realized",
+                            &error_abort);
+
+    memory_region_init_ram(main_mem, NULL, "riscv.lowrisc.ibex.ram",
+        memmap[IBEX_RAM].size, &error_fatal);
+    memory_region_add_subregion(sys_mem,
+        memmap[IBEX_RAM].base, main_mem);
+
+
+    if (machine->firmware) {
+        riscv_load_firmware(machine->firmware, memmap[IBEX_RAM].base, NULL);
+    }
+
+    if (machine->kernel_filename) {
+        riscv_load_kernel(machine->kernel_filename, NULL);
+    }
+}
+
+static void riscv_opentitan_machine_init(MachineClass *mc)
+{
+    mc->desc = "RISC-V Board compatible with OpenTitan";
+    mc->init = riscv_opentitan_init;
+    mc->max_cpus = 1;
+    mc->default_cpu_type = TYPE_RISCV_CPU_IBEX;
+}
+
+DEFINE_MACHINE("opentitan", riscv_opentitan_machine_init)
+
+static void riscv_lowrisc_ibex_soc_init(Object *obj)
+{
+    LowRISCIbexSoCState *s = RISCV_IBEX_SOC(obj);
+
+    object_initialize_child(obj, "cpus", &s->cpus,
+                            sizeof(s->cpus), TYPE_RISCV_HART_ARRAY,
+                            &error_abort, NULL);
+}
+
+static void riscv_lowrisc_ibex_soc_realize(DeviceState *dev_soc, Error **errp)
+{
+    const struct MemmapEntry *memmap = ibex_memmap;
+    MachineState *ms = MACHINE(qdev_get_machine());
+    LowRISCIbexSoCState *s = RISCV_IBEX_SOC(dev_soc);
+    MemoryRegion *sys_mem = get_system_memory();
+
+    object_property_set_str(OBJECT(&s->cpus), ms->cpu_type, "cpu-type",
+                            &error_abort);
+    object_property_set_int(OBJECT(&s->cpus), ms->smp.cpus, "num-harts",
+                            &error_abort);
+    object_property_set_bool(OBJECT(&s->cpus), true, "realized",
+                            &error_abort);
+
+    /* Boot ROM */
+    memory_region_init_rom(&s->rom, OBJECT(dev_soc), "riscv.lowrisc.ibex.rom",
+                           memmap[IBEX_ROM].size, &error_fatal);
+    memory_region_add_subregion(sys_mem,
+        memmap[IBEX_ROM].base, &s->rom);
+
+    /* Flash memory */
+    memory_region_init_rom(&s->flash_mem, OBJECT(dev_soc), "riscv.lowrisc.ibex.flash",
+                           memmap[IBEX_FLASH].size, &error_fatal);
+    memory_region_add_subregion(sys_mem, memmap[IBEX_FLASH].base,
+                                &s->flash_mem);
+
+    create_unimplemented_device("riscv.lowrisc.ibex.uart",
+        memmap[IBEX_UART].base, memmap[IBEX_UART].size);
+    create_unimplemented_device("riscv.lowrisc.ibex.gpio",
+        memmap[IBEX_GPIO].base, memmap[IBEX_GPIO].size);
+    create_unimplemented_device("riscv.lowrisc.ibex.spi",
+        memmap[IBEX_SPI].base, memmap[IBEX_SPI].size);
+    create_unimplemented_device("riscv.lowrisc.ibex.flash_ctrl",
+        memmap[IBEX_FLASH_CTRL].base, memmap[IBEX_FLASH_CTRL].size);
+    create_unimplemented_device("riscv.lowrisc.ibex.rv_timer",
+        memmap[IBEX_RV_TIMER].base, memmap[IBEX_RV_TIMER].size);
+    create_unimplemented_device("riscv.lowrisc.ibex.pwrmgr",
+        memmap[IBEX_PWRMGR].base, memmap[IBEX_PWRMGR].size);
+    create_unimplemented_device("riscv.lowrisc.ibex.rstmgr",
+        memmap[IBEX_RSTMGR].base, memmap[IBEX_RSTMGR].size);
+    create_unimplemented_device("riscv.lowrisc.ibex.clkmgr",
+        memmap[IBEX_CLKMGR].base, memmap[IBEX_CLKMGR].size);
+    create_unimplemented_device("riscv.lowrisc.ibex.aes",
+        memmap[IBEX_AES].base, memmap[IBEX_AES].size);
+    create_unimplemented_device("riscv.lowrisc.ibex.hmac",
+        memmap[IBEX_HMAC].base, memmap[IBEX_HMAC].size);
+    create_unimplemented_device("riscv.lowrisc.ibex.plic",
+        memmap[IBEX_PLIC].base, memmap[IBEX_PLIC].size);
+    create_unimplemented_device("riscv.lowrisc.ibex.pinmux",
+        memmap[IBEX_PINMUX].base, memmap[IBEX_PINMUX].size);
+    create_unimplemented_device("riscv.lowrisc.ibex.alert_handler",
+        memmap[IBEX_ALERT_HANDLER].base, memmap[IBEX_ALERT_HANDLER].size);
+    create_unimplemented_device("riscv.lowrisc.ibex.nmi_gen",
+        memmap[IBEX_NMI_GEN].base, memmap[IBEX_NMI_GEN].size);
+    create_unimplemented_device("riscv.lowrisc.ibex.usbdev",
+        memmap[IBEX_USBDEV].base, memmap[IBEX_USBDEV].size);
+    create_unimplemented_device("riscv.lowrisc.ibex.padctrl",
+        memmap[IBEX_PADCTRL].base, memmap[IBEX_PADCTRL].size);
+}
+
+static void riscv_lowrisc_ibex_soc_class_init(ObjectClass *oc, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(oc);
+
+    dc->realize = riscv_lowrisc_ibex_soc_realize;
+    /* Reason: Uses serial_hds in realize function, thus can't be used twice */
+    dc->user_creatable = false;
+}
+
+static const TypeInfo riscv_lowrisc_ibex_soc_type_info = {
+    .name = TYPE_RISCV_IBEX_SOC,
+    .parent = TYPE_DEVICE,
+    .instance_size = sizeof(LowRISCIbexSoCState),
+    .instance_init = riscv_lowrisc_ibex_soc_init,
+    .class_init = riscv_lowrisc_ibex_soc_class_init,
+};
+
+static void riscv_lowrisc_ibex_soc_register_types(void)
+{
+    type_register_static(&riscv_lowrisc_ibex_soc_type_info);
+}
+
+type_init(riscv_lowrisc_ibex_soc_register_types)