[PATCH 3/4] serial-mcb: Add serial via MEN chameleon bus

[Johannes Thumshirn]

Add MEN z125 UART over MEN Chameleon Bus emulation.

Signed-off-by: Johannes Thumshirn <jth@kernel.org>
---
 hw/char/Kconfig      |   6 +++
 hw/char/meson.build  |   1 +
 hw/char/serial-mcb.c | 115 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 122 insertions(+)
 create mode 100644 hw/char/serial-mcb.c

diff --git a/hw/char/Kconfig b/hw/char/Kconfig
index 6b6cf2fc1d..9e8ebf1d3d 100644
--- a/hw/char/Kconfig
+++ b/hw/char/Kconfig
@@ -71,3 +71,9 @@ config GOLDFISH_TTY
 
 config SHAKTI_UART
     bool
+
+config SERIAL_MCB
+    bool
+    default y if MCB
+    depends on MCB
+    select SERIAL
diff --git a/hw/char/meson.build b/hw/char/meson.build
index e02c60dd54..d5893a142d 100644
--- a/hw/char/meson.build
+++ b/hw/char/meson.build
@@ -20,6 +20,7 @@ softmmu_ss.add(when: 'CONFIG_SHAKTI_UART', if_true: 
files('shakti_uart.c'))
 softmmu_ss.add(when: 'CONFIG_VIRTIO_SERIAL', if_true: 
files('virtio-console.c'))
 softmmu_ss.add(when: 'CONFIG_XEN_BUS', if_true: files('xen_console.c'))
 softmmu_ss.add(when: 'CONFIG_XILINX', if_true: files('xilinx_uartlite.c'))
+softmmu_ss.add(when: 'CONFIG_SERIAL_MCB', if_true: files('serial-mcb.c'))
 
 softmmu_ss.add(when: 'CONFIG_AVR_USART', if_true: files('avr_usart.c'))
 softmmu_ss.add(when: 'CONFIG_COLDFIRE', if_true: files('mcf_uart.c'))
diff --git a/hw/char/serial-mcb.c b/hw/char/serial-mcb.c
new file mode 100644
index 0000000000..7ca8a248ac
--- /dev/null
+++ b/hw/char/serial-mcb.c
@@ -0,0 +1,115 @@
+/*
+ * QEMU MEN 16z125 UART over MCB emulation
+ *
+ * Copyright (C) 2023 Johannes Thumshirn <jth@kernel.org>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "qemu/module.h"
+#include "hw/char/serial.h"
+#include "hw/mcb/mcb.h"
+#include "hw/irq.h"
+#include "hw/qdev-properties.h"
+#include "hw/qdev-properties-system.h"
+#include "migration/vmstate.h"
+
+struct MCBSerialState {
+    MCBDevice dev;
+    SerialState state;
+};
+
+#define TYPE_MCB_SERIAL "mcb-serial"
+OBJECT_DECLARE_SIMPLE_TYPE(MCBSerialState, MCB_SERIAL)
+
+static void serial_mcb_realize(DeviceState *dev, Error **errp)
+{
+    MCBDevice *mdev = MCB_DEVICE(dev);
+    MCBSerialState *mss = DO_UPCAST(MCBSerialState, dev, mdev);
+    MCBus *bus = MCB_BUS(qdev_get_parent_bus(DEVICE(dev)));
+    SerialState *s = &mss->state;
+
+    mdev->gdd = mcb_new_chameleon_descriptor(bus, 125, mdev->rev,
+                                             mdev->var, 0x10);
+    if (!mdev->gdd) {
+        return;
+    }
+
+    s->baudbase = 115200;
+    if (!qdev_realize(DEVICE(s), NULL, errp)) {
+        return;
+    }
+
+    s->irq = mcb_allocate_irq(&mss->dev);
+    memory_region_init_io(&s->io, OBJECT(mss), &serial_io_ops, s, "serial", 8);
+    memory_region_add_subregion(&bus->mmio_region, mdev->gdd->offset, &s->io);
+}
+
+static void serial_mcb_unrealize(DeviceState *dev)
+{
+    MCBDevice *mdev = MCB_DEVICE(dev);
+    MCBSerialState *mss = DO_UPCAST(MCBSerialState, dev, mdev);
+    SerialState *s = &mss->state;
+
+    qdev_unrealize(DEVICE(s));
+    qemu_free_irq(s->irq);
+    g_free(&mdev->gdd);
+}
+
+static const VMStateDescription vmstate_mcb_serial = {
+    .name = "mcb-serial",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_MCB_DEVICE(dev, MCBSerialState),
+        VMSTATE_STRUCT(state, MCBSerialState, 0, vmstate_serial, SerialState),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static Property serial_mcb_properties[] = {
+    DEFINE_PROP_UINT8("rev", MCBSerialState, dev.rev, 0),
+    DEFINE_PROP_UINT8("var", MCBSerialState, dev.var, 0),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void serial_mcb_class_initfn(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    MCBDeviceClass *mc = MCB_DEVICE_CLASS(klass);
+
+    mc->realize = serial_mcb_realize;
+    mc->unrealize = serial_mcb_unrealize;
+
+    set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
+    dc->desc = "MEN 16z125 UART over MCB";
+    dc->vmsd = &vmstate_mcb_serial;
+    device_class_set_props(dc, serial_mcb_properties);
+}
+
+static void serial_mcb_init(Object *o)
+{
+    MCBSerialState *mss = MCB_SERIAL(o);
+
+    object_initialize_child(o, "serial", &mss->state, TYPE_SERIAL);
+
+    qdev_alias_all_properties(DEVICE(&mss->state), o);
+}
+
+static const TypeInfo serial_mcb_info = {
+    .name = "mcb-serial",
+    .parent = TYPE_MCB_DEVICE,
+    .instance_size = sizeof(MCBSerialState),
+    .instance_init = serial_mcb_init,
+    .class_init = serial_mcb_class_initfn,
+};
+
+static void serial_mcb_register_types(void)
+{
+    type_register_static(&serial_mcb_info);
+}
+
+type_init(serial_mcb_register_types);
-- 
2.39.2