hw/arm/stellaris: split stellaris_sys_init()

Currently the stellaris_sys_init() function creates the
TYPE_STELLARIS_SYS object, sets its properties, realizes it, maps its
MMIO region and connects its IRQ.  In order to support wiring the
sysclk up to the armv7m object, we need to split this function apart,
because to connect the clock output of the STELLARIS_SYS object to
the armv7m object we need to create the STELLARIS_SYS object before
the armv7m object, but we can't wire up the IRQ until after we've
created the armv7m object.

Remove the stellaris_sys_init() function, and instead put the
create/configure/realize parts before we create the armv7m object and
the mmio/irq connection parts afterwards.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Alexandre Iooss <erdnaxe@crans.org>
Message-id: 20210812093356.1946-17-peter.maydell@linaro.org

1 files changed, 25 insertions, 31 deletions

diff --git a/hw/arm/stellaris.c b/hw/arm/stellaris.c
index ad48cf2..bf24abd 100644
--- a/hw/arm/stellaris.c
+++ b/hw/arm/stellaris.c
@@ -755,33 +755,6 @@ static void stellaris_sys_instance_init(Object *obj)
     s->sysclk = qdev_init_clock_out(DEVICE(s), "SYSCLK");
 }
 
-static DeviceState *stellaris_sys_init(uint32_t base, qemu_irq irq,
-                                       stellaris_board_info *board,
-                                       uint8_t *macaddr)
-{
-    DeviceState *dev = qdev_new(TYPE_STELLARIS_SYS);
-    SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
-
-    /* Most devices come preprogrammed with a MAC address in the user data. */
-    qdev_prop_set_uint32(dev, "user0",
-                         macaddr[0] | (macaddr[1] << 8) | (macaddr[2] << 16));
-    qdev_prop_set_uint32(dev, "user1",
-                         macaddr[3] | (macaddr[4] << 8) | (macaddr[5] << 16));
-    qdev_prop_set_uint32(dev, "did0", board->did0);
-    qdev_prop_set_uint32(dev, "did1", board->did1);
-    qdev_prop_set_uint32(dev, "dc0", board->dc0);
-    qdev_prop_set_uint32(dev, "dc1", board->dc1);
-    qdev_prop_set_uint32(dev, "dc2", board->dc2);
-    qdev_prop_set_uint32(dev, "dc3", board->dc3);
-    qdev_prop_set_uint32(dev, "dc4", board->dc4);
-
-    sysbus_realize_and_unref(sbd, &error_fatal);
-    sysbus_mmio_map(sbd, 0, base);
-    sysbus_connect_irq(sbd, 0, irq);
-
-    return dev;
-}
-
 /* I2C controller.  */
 
 #define TYPE_STELLARIS_I2C "stellaris-i2c"
@@ -1349,6 +1322,7 @@ static void stellaris_init(MachineState *ms, stellaris_board_info *board)
     DeviceState *ssys_dev;
     int i;
     int j;
+    uint8_t *macaddr;
 
     MemoryRegion *sram = g_new(MemoryRegion, 1);
     MemoryRegion *flash = g_new(MemoryRegion, 1);
@@ -1366,6 +1340,26 @@ static void stellaris_init(MachineState *ms, stellaris_board_info *board)
                            &error_fatal);
     memory_region_add_subregion(system_memory, 0x20000000, sram);
 
+    /*
+     * Create the system-registers object early, because we will
+     * need its sysclk output.
+     */
+    ssys_dev = qdev_new(TYPE_STELLARIS_SYS);
+    /* Most devices come preprogrammed with a MAC address in the user data. */
+    macaddr = nd_table[0].macaddr.a;
+    qdev_prop_set_uint32(ssys_dev, "user0",
+                         macaddr[0] | (macaddr[1] << 8) | (macaddr[2] << 16));
+    qdev_prop_set_uint32(ssys_dev, "user1",
+                         macaddr[3] | (macaddr[4] << 8) | (macaddr[5] << 16));
+    qdev_prop_set_uint32(ssys_dev, "did0", board->did0);
+    qdev_prop_set_uint32(ssys_dev, "did1", board->did1);
+    qdev_prop_set_uint32(ssys_dev, "dc0", board->dc0);
+    qdev_prop_set_uint32(ssys_dev, "dc1", board->dc1);
+    qdev_prop_set_uint32(ssys_dev, "dc2", board->dc2);
+    qdev_prop_set_uint32(ssys_dev, "dc3", board->dc3);
+    qdev_prop_set_uint32(ssys_dev, "dc4", board->dc4);
+    sysbus_realize_and_unref(SYS_BUS_DEVICE(ssys_dev), &error_fatal);
+
     nvic = qdev_new(TYPE_ARMV7M);
     qdev_prop_set_uint32(nvic, "num-irq", NUM_IRQ_LINES);
     qdev_prop_set_string(nvic, "cpu-type", ms->cpu_type);
@@ -1375,6 +1369,10 @@ static void stellaris_init(MachineState *ms, stellaris_board_info *board)
     /* This will exit with an error if the user passed us a bad cpu_type */
     sysbus_realize_and_unref(SYS_BUS_DEVICE(nvic), &error_fatal);
 
+    /* Now we can wire up the IRQ and MMIO of the system registers */
+    sysbus_mmio_map(SYS_BUS_DEVICE(ssys_dev), 0, 0x400fe000);
+    sysbus_connect_irq(SYS_BUS_DEVICE(ssys_dev), 0, qdev_get_gpio_in(nvic, 28));
+
     if (board->dc1 & (1 << 16)) {
         dev = sysbus_create_varargs(TYPE_STELLARIS_ADC, 0x40038000,
                                     qdev_get_gpio_in(nvic, 14),
@@ -1397,10 +1395,6 @@ static void stellaris_init(MachineState *ms, stellaris_board_info *board)
         }
     }
 
-    ssys_dev = stellaris_sys_init(0x400fe000, qdev_get_gpio_in(nvic, 28),
-                                  board, nd_table[0].macaddr.a);
-
-
     if (board->dc1 & (1 << 3)) { /* watchdog present */
         dev = qdev_new(TYPE_LUMINARY_WATCHDOG);