hw/riscv: sifive_u: Correct the CLINT timebase frequency

At present the CLINT timebase frequency is set to 10MHz on sifive_u,
but on the real hardware the timebase frequency is 1Mhz.

Signed-off-by: Bin Meng <bin.meng@windriver.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20210706102616.1922469-1-bmeng.cn@gmail.com
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

hw/riscv/sifive_u.c

@@ -62,6 +62,9 @@
 
 #include <libfdt.h>
 
+/* CLINT timebase frequency */
+#define CLINT_TIMEBASE_FREQ 1000000
+
 static const MemMapEntry sifive_u_memmap[] = {
     [SIFIVE_U_DEV_DEBUG] =    {        0x0,      0x100 },
     [SIFIVE_U_DEV_MROM] =     {     0x1000,     0xf000 },
@@ -165,7 +168,7 @@ static void create_fdt(SiFiveUState *s, const MemMapEntry *memmap,
 
     qemu_fdt_add_subnode(fdt, "/cpus");
     qemu_fdt_setprop_cell(fdt, "/cpus", "timebase-frequency",
-        SIFIVE_CLINT_TIMEBASE_FREQ);
+        CLINT_TIMEBASE_FREQ);
     qemu_fdt_setprop_cell(fdt, "/cpus", "#size-cells", 0x0);
     qemu_fdt_setprop_cell(fdt, "/cpus", "#address-cells", 0x1);
 
@@ -847,7 +850,7 @@ static void sifive_u_soc_realize(DeviceState *dev, Error **errp)
     sifive_clint_create(memmap[SIFIVE_U_DEV_CLINT].base,
         memmap[SIFIVE_U_DEV_CLINT].size, 0, ms->smp.cpus,
         SIFIVE_SIP_BASE, SIFIVE_TIMECMP_BASE, SIFIVE_TIME_BASE,
-        SIFIVE_CLINT_TIMEBASE_FREQ, false);
+        CLINT_TIMEBASE_FREQ, false);
 
     if (!sysbus_realize(SYS_BUS_DEVICE(&s->prci), errp)) {
         return;