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 <and...@aj.id.au> Signed-off-by: Cédric Le Goater <c...@kaod.org> Signed-off-by: Ninad Palsule <ni...@linux.ibm.com> --- 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 0000000000..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(&ldev->iomem, OBJECT(ldev), &scratchpad_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 */ + | 0x00010000 /* slots */ + | 0x00001000 /* version */ + | ENGINE_CONFIG_TYPE_SCRATCHPAD /* type */ + | 0x00000007; /* 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(&scratchpad_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 0000000000..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 ENGINE_CONFIG_CRC BE_GENMASK(28, 31) + +#define TYPE_SCRATCHPAD "scratchpad" +#define SCRATCHPAD(obj) OBJECT_CHECK(ScratchPad, (obj), TYPE_SCRATCHPAD) + +typedef struct ScratchPad { + LBusDevice parent; + + uint32_t reg; +} ScratchPad; + +#endif /* FSI_ENGINE_SCRATCHPAD_H */ -- 2.39.2