[PULL v2 27/32] hw/riscv: sifive_u: Add a new property msel for MSEL pin state

[Alistair Francis]

From: Bin Meng <bin.m...@windriver.com>

On SiFive FU540 SoC, the value stored at physical address 0x1000
stores the MSEL pin state that is used to control the next boot
location that ROM codes jump to.

Add a new property msel to sifive_u machine for this.

Signed-off-by: Bin Meng <bin.m...@windriver.com>
Reviewed-by: Alistair Francis <alistair.fran...@wdc.com>
Message-id: 1591625864-31494-12-git-send-email-bmeng...@gmail.com
Message-Id: <1591625864-31494-12-git-send-email-bmeng...@gmail.com>
Signed-off-by: Alistair Francis <alistair.fran...@wdc.com>
---
 include/hw/riscv/sifive_u.h | 1 +
 hw/riscv/sifive_u.c         | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/include/hw/riscv/sifive_u.h b/include/hw/riscv/sifive_u.h
index b1399a90a6..f6d10ebfb6 100644
--- a/include/hw/riscv/sifive_u.h
+++ b/include/hw/riscv/sifive_u.h
@@ -63,6 +63,7 @@ typedef struct SiFiveUState {
     int fdt_size;
 
     bool start_in_flash;
+    uint32_t msel;
     uint32_t serial;
 } SiFiveUState;
 
diff --git a/hw/riscv/sifive_u.c b/hw/riscv/sifive_u.c
index 6dac662910..b04be42167 100644
--- a/hw/riscv/sifive_u.c
+++ b/hw/riscv/sifive_u.c
@@ -504,6 +504,13 @@ static void sifive_u_machine_instance_init(Object *obj)
                                     "Set on to tell QEMU's ROM to jump to "
                                     "flash. Otherwise QEMU will jump to DRAM");
 
+    s->msel = 0;
+    object_property_add(obj, "msel", "uint32",
+                        sifive_u_machine_get_uint32_prop,
+                        sifive_u_machine_set_uint32_prop, NULL, &s->msel);
+    object_property_set_description(obj, "msel",
+                                    "Mode Select (MSEL[3:0]) pin state");
+
     s->serial = OTP_SERIAL;
     object_property_add(obj, "serial", "uint32",
                         sifive_u_machine_get_uint32_prop,
-- 
2.27.0