[PATCH v12 01/11] hw/fsi: Introduce IBM's Local bus

[Ninad Palsule <ninad@linux.ibm.com>]

This is a part of patchset where IBM's Flexible Service Interface is
introduced.

The LBUS is modelled to maintain mapped memory for the devices. The
memory is mapped after CFAM config, peek table and FSI slave registers.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
[ clg: - removed lbus_add_device() bc unused
       - removed lbus_create_device() bc used only once
       - removed "address" property
       - updated meson.build to build fsi dir
       - included an empty hw/fsi/trace-events ]
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Ninad Palsule <ninad@linux.ibm.com>
---
v9:
  - Changed LBUS memory region to 1MB.
v11:
  - Split lbus and scratchpad into separate patches.
  - Added fsi_ prefix for all functions in lbus.
  - Removed FSI_LBUS* typedefs.
  - Replaced for loop with memset.
---
 meson.build           |  1 +
 hw/fsi/trace.h        |  1 +
 include/hw/fsi/lbus.h | 32 ++++++++++++++++++++++++++++++++
 hw/fsi/lbus.c         | 43 +++++++++++++++++++++++++++++++++++++++++++
 hw/Kconfig            |  1 +
 hw/fsi/Kconfig        |  2 ++
 hw/fsi/meson.build    |  1 +
 hw/fsi/trace-events   |  0
 hw/meson.build        |  1 +
 9 files changed, 82 insertions(+)
 create mode 100644 hw/fsi/trace.h
 create mode 100644 include/hw/fsi/lbus.h
 create mode 100644 hw/fsi/lbus.c
 create mode 100644 hw/fsi/Kconfig
 create mode 100644 hw/fsi/meson.build
 create mode 100644 hw/fsi/trace-events

diff --git a/meson.build b/meson.build
index d0329966f1..7d926c6e82 100644
--- a/meson.build
+++ b/meson.build
@@ -3290,6 +3290,7 @@ if have_system
     'hw/char',
     'hw/display',
     'hw/dma',
+    'hw/fsi',
     'hw/hyperv',
     'hw/i2c',
     'hw/i386',
diff --git a/hw/fsi/trace.h b/hw/fsi/trace.h
new file mode 100644
index 0000000000..ee67c7fb04
--- /dev/null
+++ b/hw/fsi/trace.h
@@ -0,0 +1 @@
+#include "trace/trace-hw_fsi.h"
diff --git a/include/hw/fsi/lbus.h b/include/hw/fsi/lbus.h
new file mode 100644
index 0000000000..e8a22e22a8
--- /dev/null
+++ b/include/hw/fsi/lbus.h
@@ -0,0 +1,32 @@
+/*
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ * Copyright (C) 2024 IBM Corp.
+ *
+ * IBM Local bus and connected device structures.
+ */
+#ifndef FSI_LBUS_H
+#define FSI_LBUS_H
+
+#include "hw/qdev-core.h"
+#include "qemu/units.h"
+#include "exec/memory.h"
+
+#define TYPE_FSI_LBUS_DEVICE "fsi.lbus.device"
+OBJECT_DECLARE_SIMPLE_TYPE(FSILBusDevice, FSI_LBUS_DEVICE)
+
+typedef struct FSILBusDevice {
+    DeviceState parent;
+
+    MemoryRegion iomem;
+} FSILBusDevice;
+
+#define TYPE_FSI_LBUS "fsi.lbus"
+OBJECT_DECLARE_SIMPLE_TYPE(FSILBus, FSI_LBUS)
+
+typedef struct FSILBus {
+    BusState bus;
+
+    MemoryRegion mr;
+} FSILBus;
+
+#endif /* FSI_LBUS_H */
diff --git a/hw/fsi/lbus.c b/hw/fsi/lbus.c
new file mode 100644
index 0000000000..44d2319087
--- /dev/null
+++ b/hw/fsi/lbus.c
@@ -0,0 +1,43 @@
+/*
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ * Copyright (C) 2024 IBM Corp.
+ *
+ * IBM Local bus where FSI slaves are connected
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "hw/fsi/lbus.h"
+
+#include "hw/qdev-properties.h"
+
+#include "trace.h"
+
+static void fsi_lbus_init(Object *o)
+{
+    FSILBus *lbus = FSI_LBUS(o);
+
+    memory_region_init(&lbus->mr, OBJECT(lbus), TYPE_FSI_LBUS, 1 * MiB);
+}
+
+static const TypeInfo fsi_lbus_info = {
+    .name = TYPE_FSI_LBUS,
+    .parent = TYPE_BUS,
+    .instance_init = fsi_lbus_init,
+    .instance_size = sizeof(FSILBus),
+};
+
+static const TypeInfo fsi_lbus_device_type_info = {
+    .name = TYPE_FSI_LBUS_DEVICE,
+    .parent = TYPE_DEVICE,
+    .instance_size = sizeof(FSILBusDevice),
+    .abstract = true,
+};
+
+static void fsi_lbus_register_types(void)
+{
+    type_register_static(&fsi_lbus_info);
+    type_register_static(&fsi_lbus_device_type_info);
+}
+
+type_init(fsi_lbus_register_types);
diff --git a/hw/Kconfig b/hw/Kconfig
index 9ca7b38c31..2c00936c28 100644
--- a/hw/Kconfig
+++ b/hw/Kconfig
@@ -9,6 +9,7 @@ source core/Kconfig
 source cxl/Kconfig
 source display/Kconfig
 source dma/Kconfig
+source fsi/Kconfig
 source gpio/Kconfig
 source hyperv/Kconfig
 source i2c/Kconfig
diff --git a/hw/fsi/Kconfig b/hw/fsi/Kconfig
new file mode 100644
index 0000000000..9c34a418d7
--- /dev/null
+++ b/hw/fsi/Kconfig
@@ -0,0 +1,2 @@
+config FSI
+    bool
diff --git a/hw/fsi/meson.build b/hw/fsi/meson.build
new file mode 100644
index 0000000000..93ba19dd04
--- /dev/null
+++ b/hw/fsi/meson.build
@@ -0,0 +1 @@
+system_ss.add(when: 'CONFIG_FSI', if_true: files('lbus.c'))
diff --git a/hw/fsi/trace-events b/hw/fsi/trace-events
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/hw/meson.build b/hw/meson.build
index f01fac4617..463d702683 100644
--- a/hw/meson.build
+++ b/hw/meson.build
@@ -44,6 +44,7 @@ subdir('virtio')
 subdir('watchdog')
 subdir('xen')
 subdir('xenpv')
+subdir('fsi')
 
 subdir('alpha')
 subdir('arm')
-- 
2.39.2