This is a part of patchset where IBM's Flexible Service Interface is
introduced.
The LBUS device is embeded inside the scratchpad. The scratchpad
provides a non-functional registers. There is a 1-1 relation between
scratchpad and LBUS devices. Each LBUS device has 1K memory mapped in
the LBUS.
Signed-off-by: Andrew Jeffery
Signed-off-by: Cédric Le Goater
Signed-off-by: Ninad Palsule
---
hw/fsi/Kconfig | 4 ++
hw/fsi/engine-scratchpad.c | 100 +
hw/fsi/meson.build | 1 +
include/hw/fsi/engine-scratchpad.h | 32 +
4 files changed, 137 insertions(+)
create mode 100644 hw/fsi/engine-scratchpad.c
create mode 100644 include/hw/fsi/engine-scratchpad.h
diff --git a/hw/fsi/Kconfig b/hw/fsi/Kconfig
index 687449e14e..2a9c49f2c9 100644
--- a/hw/fsi/Kconfig
+++ b/hw/fsi/Kconfig
@@ -1,2 +1,6 @@
+config SCRATCHPAD
+bool
+select LBUS
+
config LBUS
bool
diff --git a/hw/fsi/engine-scratchpad.c b/hw/fsi/engine-scratchpad.c
new file mode 100644
index 00..15a8f8cc66
--- /dev/null
+++ b/hw/fsi/engine-scratchpad.c
@@ -0,0 +1,100 @@
+/*
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ * Copyright (C) 2023 IBM Corp.
+ *
+ * IBM scratchpad engine
+ */
+
+#include "qemu/osdep.h"
+
+#include "qapi/error.h"
+#include "qemu/log.h"
+
+#include "hw/fsi/engine-scratchpad.h"
+
+static uint64_t scratchpad_read(void *opaque, hwaddr addr, unsigned size)
+{
+ScratchPad *s = SCRATCHPAD(opaque);
+
+qemu_log_mask(LOG_UNIMP, "%s: read @0x%" HWADDR_PRIx " size=%d\n",
+ __func__, addr, size);
+
+if (addr) {
+qemu_log_mask(LOG_GUEST_ERROR,
+ "%s: Out of bounds read: 0x%"HWADDR_PRIx" for %u\n",
+ __func__, addr, size);
+return 0;
+}
+
+return s->reg;
+}
+
+static void scratchpad_write(void *opaque, hwaddr addr, uint64_t data,
+ unsigned size)
+{
+ScratchPad *s = SCRATCHPAD(opaque);
+
+qemu_log_mask(LOG_UNIMP, "%s: write @0x%" HWADDR_PRIx " size=%d "
+ "value=%"PRIx64"\n", __func__, addr, size, data);
+
+if (addr) {
+qemu_log_mask(LOG_GUEST_ERROR,
+ "%s: Out of bounds write: 0x%"HWADDR_PRIx" for %u\n",
+ __func__, addr, size);
+return;
+}
+
+s->reg = data;
+}
+
+static const struct MemoryRegionOps scratchpad_ops = {
+.read = scratchpad_read,
+.write = scratchpad_write,
+.endianness = DEVICE_BIG_ENDIAN,
+};
+
+static void scratchpad_realize(DeviceState *dev, Error **errp)
+{
+LBusDevice *ldev = LBUS_DEVICE(dev);
+
+memory_region_init_io(>iomem, OBJECT(ldev), _ops,
+ ldev, TYPE_SCRATCHPAD, 0x400);
+}
+
+static void scratchpad_reset(DeviceState *dev)
+{
+ScratchPad *s = SCRATCHPAD(dev);
+
+s->reg = 0;
+}
+
+static void scratchpad_class_init(ObjectClass *klass, void *data)
+{
+DeviceClass *dc = DEVICE_CLASS(klass);
+LBusDeviceClass *ldc = LBUS_DEVICE_CLASS(klass);
+
+dc->realize = scratchpad_realize;
+dc->reset = scratchpad_reset;
+
+ldc->config =
+ ENGINE_CONFIG_NEXT/* valid */
+| 0x0001/* slots */
+| 0x1000/* version */
+| ENGINE_CONFIG_TYPE_SCRATCHPAD /* type */
+| 0x0007; /* crc */
+}
+
+static const TypeInfo scratchpad_info = {
+.name = TYPE_SCRATCHPAD,
+.parent = TYPE_LBUS_DEVICE,
+.instance_size = sizeof(ScratchPad),
+.class_init = scratchpad_class_init,
+.class_size = sizeof(LBusDeviceClass),
+};
+
+static void scratchpad_register_types(void)
+{
+type_register_static(_info);
+}
+
+type_init(scratchpad_register_types);
diff --git a/hw/fsi/meson.build b/hw/fsi/meson.build
index e1007d5fea..f90e09ddab 100644
--- a/hw/fsi/meson.build
+++ b/hw/fsi/meson.build
@@ -1 +1,2 @@
system_ss.add(when: 'CONFIG_LBUS', if_true: files('lbus.c'))
+system_ss.add(when: 'CONFIG_SCRATCHPAD', if_true: files('engine-scratchpad.c'))
diff --git a/include/hw/fsi/engine-scratchpad.h
b/include/hw/fsi/engine-scratchpad.h
new file mode 100644
index 00..c2c8aa0b7e
--- /dev/null
+++ b/include/hw/fsi/engine-scratchpad.h
@@ -0,0 +1,32 @@
+/*
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ * Copyright (C) 2023 IBM Corp.
+ *
+ * IBM scratchpad engne
+ */
+#ifndef FSI_ENGINE_SCRATCHPAD_H
+#define FSI_ENGINE_SCRATCHPAD_H
+
+#include "hw/fsi/lbus.h"
+#include "hw/fsi/bits.h"
+
+#define ENGINE_CONFIG_NEXT BE_BIT(0)
+#define ENGINE_CONFIG_VPD BE_BIT(1)
+#define ENGINE_CONFIG_SLOTS BE_GENMASK(8, 15)
+#define ENGINE_CONFIG_VERSION BE_GENMASK(16, 19)
+#define ENGINE_CONFIG_TYPE BE_GENMASK(20, 27)
+#define ENGINE_CONFIG_TYPE_PEEK (0x02 << 4)
+#define ENGINE_CONFIG_TYPE_FSI(0x03 << 4)
+#define ENGINE_CONFIG_TYPE_SCRATCHPAD (0x06 << 4)
+#define
