msf2: Wire up SYSRESETREQ in SoC for system reset

Implemented system reset by creating SYSRESETREQ gpio
out from nvic.

Signed-off-by: Subbaraya Sundeep <sundeep.lkml@gmail.com>
Message-id: 1509253165-7434-1-git-send-email-sundeep.lkml@gmail.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/arm/msf2-soc.c

@@ -57,6 +57,13 @@ static const int spi_irq[MSF2_NUM_SPIS] = { 2, 3 };
 static const int uart_irq[MSF2_NUM_UARTS] = { 10, 11 };
 static const int timer_irq[MSF2_NUM_TIMERS] = { 14, 15 };
 
+static void do_sys_reset(void *opaque, int n, int level)
+{
+    if (level) {
+        qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
+    }
+}
+
 static void m2sxxx_soc_initfn(Object *obj)
 {
     MSF2State *s = MSF2_SOC(obj);
@@ -125,6 +132,10 @@ static void m2sxxx_soc_realize(DeviceState *dev_soc, Error **errp)
         error_append_hint(errp, "m3clk can not be zero\n");
         return;
     }
+
+    qdev_connect_gpio_out_named(DEVICE(&s->armv7m.nvic), "SYSRESETREQ", 0,
+                                qemu_allocate_irq(&do_sys_reset, NULL, 0));
+
     system_clock_scale = NANOSECONDS_PER_SECOND / s->m3clk;
 
     for (i = 0; i < MSF2_NUM_UARTS; i++) {