diff mbox series

[PULL,15/26] hw/arm/armv7m: Handle disconnected clock inputs

Message ID 20220221092800.404870-16-peter.maydell@linaro.org
State New
Headers show
Series [PULL,01/26] MAINTAINERS: Adding myself as a reviewer of some components | expand

Commit Message

Peter Maydell Feb. 21, 2022, 9:27 a.m. UTC 
In the armv7m object, handle clock inputs that aren't connected.
This is always an error for 'cpuclk'. For 'refclk' it is OK for this
to be disconnected, but we need to handle it by not trying to connect
a sourceless-clock to the systick device.

This fixes a bug where on the mps2-an521 and similar boards (which
do not have a refclk) the systick device incorrectly reset with
SYST_CSR.CLKSOURCE 0 ("use refclk") rather than 1 ("use CPU clock").

Cc: qemu-stable@nongnu.org
Reported-by: Richard Petri <git@rpls.de>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220208171643.3486277-1-peter.maydell@linaro.org
---
 hw/arm/armv7m.c | 26 ++++++++++++++++++++++----
 1 file changed, 22 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/hw/arm/armv7m.c b/hw/arm/armv7m.c
index ceb76df3cd4..41cfca0f223 100644
--- a/hw/arm/armv7m.c
+++ b/hw/arm/armv7m.c
@@ -284,6 +284,12 @@  static void armv7m_realize(DeviceState *dev, Error **errp)
         return;
     }
 
+    /* cpuclk must be connected; refclk is optional */
+    if (!clock_has_source(s->cpuclk)) {
+        error_setg(errp, "armv7m: cpuclk must be connected");
+        return;
+    }
+
     memory_region_add_subregion_overlap(&s->container, 0, s->board_memory, -1);
 
     s->cpu = ARM_CPU(object_new_with_props(s->cpu_type, OBJECT(s), "cpu",
@@ -420,8 +426,18 @@  static void armv7m_realize(DeviceState *dev, Error **errp)
                                     &s->sysreg_ns_mem);
     }
 
-    /* Create and map the systick devices */
-    qdev_connect_clock_in(DEVICE(&s->systick[M_REG_NS]), "refclk", s->refclk);
+    /*
+     * Create and map the systick devices. Note that we only connect
+     * refclk if it has been connected to us; otherwise the systick
+     * device gets the wrong answer for clock_has_source(refclk), because
+     * it has an immediate source (the ARMv7M's clock object) but not
+     * an ultimate source, and then it won't correctly auto-select the
+     * CPU clock as its only possible clock source.
+     */
+    if (clock_has_source(s->refclk)) {
+        qdev_connect_clock_in(DEVICE(&s->systick[M_REG_NS]), "refclk",
+                              s->refclk);
+    }
     qdev_connect_clock_in(DEVICE(&s->systick[M_REG_NS]), "cpuclk", s->cpuclk);
     if (!sysbus_realize(SYS_BUS_DEVICE(&s->systick[M_REG_NS]), errp)) {
         return;
@@ -438,8 +454,10 @@  static void armv7m_realize(DeviceState *dev, Error **errp)
          */
         object_initialize_child(OBJECT(dev), "systick-reg-s",
                                 &s->systick[M_REG_S], TYPE_SYSTICK);
-        qdev_connect_clock_in(DEVICE(&s->systick[M_REG_S]), "refclk",
-                              s->refclk);
+        if (clock_has_source(s->refclk)) {
+            qdev_connect_clock_in(DEVICE(&s->systick[M_REG_S]), "refclk",
+                                  s->refclk);
+        }
         qdev_connect_clock_in(DEVICE(&s->systick[M_REG_S]), "cpuclk",
                               s->cpuclk);