[PATCH v4 8/9] hw/arm/raspi: Add the Raspberry Pi Zero machine

["Philippe Mathieu-Daudé" <f4bug@amsat.org>]

Similarly to the Pi A, the Pi Zero uses a BCM2835 SoC (ARMv6Z core).

The only difference between the revision 1.2 and 1.3 is the latter
exposes a CSI camera connector. As we do not implement the Unicam
peripheral, there is no point in exposing a camera connector :)
Therefore we choose to model the 1.2 revision.

Example booting the machine using content from [*]:

  $ qemu-system-arm -M raspi0 -serial stdio \
      -kernel raspberrypi/firmware/boot/kernel.img \
      -dtb raspberrypi/firmware/boot/bcm2708-rpi-zero.dtb \
      -append 'printk.time=0 earlycon=pl011,0x20201000 console=ttyAMA0'
  [    0.000000] Booting Linux on physical CPU 0x0
  [    0.000000] Linux version 4.19.118+ (dom@buildbot) (gcc version 4.9.3 (crosstool-NG crosstool-ng-1.22.0-88-g8460611)) #1311 Mon Apr 27 14:16:15 BST 2020
  [    0.000000] CPU: ARMv6-compatible processor [410fb767] revision 7 (ARMv7), cr=00c5387d
  [    0.000000] CPU: VIPT aliasing data cache, unknown instruction cache
  [    0.000000] OF: fdt: Machine model: Raspberry Pi Zero
  ...

[*] http://archive.raspberrypi.org/debian/pool/main/r/raspberrypi-firmware/raspberrypi-kernel_1.20200512-2_armhf.deb

Reviewed-by: Luc Michel <luc.michel@greensocs.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 hw/arm/raspi.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/hw/arm/raspi.c b/hw/arm/raspi.c
index 79fdd354603..0f5ea7e99b5 100644
--- a/hw/arm/raspi.c
+++ b/hw/arm/raspi.c
@@ -319,6 +319,15 @@ static void raspi_machine_class_common_init(MachineClass *mc,
     mc->default_ram_id = "ram";
 };
 
+static void raspi0_machine_class_init(ObjectClass *oc, void *data)
+{
+    MachineClass *mc = MACHINE_CLASS(oc);
+    RaspiMachineClass *rmc = RASPI_MACHINE_CLASS(oc);
+
+    rmc->board_rev = 0x920092; /* Revision 1.2 */
+    raspi_machine_class_common_init(mc, rmc->board_rev);
+};
+
 static void raspi1ap_machine_class_init(ObjectClass *oc, void *data)
 {
     MachineClass *mc = MACHINE_CLASS(oc);
@@ -352,6 +361,10 @@ static void raspi3b_machine_class_init(ObjectClass *oc, void *data)
 
 static const TypeInfo raspi_machine_types[] = {
     {
+        .name           = MACHINE_TYPE_NAME("raspi0"),
+        .parent         = TYPE_RASPI_MACHINE,
+        .class_init     = raspi0_machine_class_init,
+    }, {
         .name           = MACHINE_TYPE_NAME("raspi1ap"),
         .parent         = TYPE_RASPI_MACHINE,
         .class_init     = raspi1ap_machine_class_init,
-- 
2.26.2