diff options
Diffstat (limited to 'hw/misc/lm32_sys.c')
| -rw-r--r-- | hw/misc/lm32_sys.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/hw/misc/lm32_sys.c b/hw/misc/lm32_sys.c new file mode 100644 index 0000000000..33a3b80ce7 --- /dev/null +++ b/hw/misc/lm32_sys.c @@ -0,0 +1,172 @@ +/* + * QEMU model of the LatticeMico32 system control block. + * + * Copyright (c) 2010 Michael Walle <michael@walle.cc> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see <http://www.gnu.org/licenses/>. + */ + +/* + * This model is mainly intended for testing purposes and doesn't fit to any + * real hardware. On the one hand it provides a control register (R_CTRL) on + * the other hand it supports the lm32 tests. + * + * A write to the control register causes a system shutdown. + * Tests first write the pointer to a test name to the test name register + * (R_TESTNAME) and then write a zero to the pass/fail register (R_PASSFAIL) if + * the test is passed or any non-zero value to it if the test is failed. + */ + +#include "hw/hw.h" +#include "hw/sysbus.h" +#include "trace.h" +#include "qemu/log.h" +#include "qemu/error-report.h" +#include "sysemu/sysemu.h" +#include "qemu/log.h" + +enum { + R_CTRL = 0, + R_PASSFAIL, + R_TESTNAME, + R_MAX +}; + +#define MAX_TESTNAME_LEN 16 + +struct LM32SysState { + SysBusDevice busdev; + MemoryRegion iomem; + uint32_t base; + uint32_t regs[R_MAX]; + uint8_t testname[MAX_TESTNAME_LEN]; +}; +typedef struct LM32SysState LM32SysState; + +static void copy_testname(LM32SysState *s) +{ + cpu_physical_memory_read(s->regs[R_TESTNAME], s->testname, + MAX_TESTNAME_LEN); + s->testname[MAX_TESTNAME_LEN - 1] = '\0'; +} + +static void sys_write(void *opaque, hwaddr addr, + uint64_t value, unsigned size) +{ + LM32SysState *s = opaque; + char *testname; + + trace_lm32_sys_memory_write(addr, value); + + addr >>= 2; + switch (addr) { + case R_CTRL: + qemu_system_shutdown_request(); + break; + case R_PASSFAIL: + s->regs[addr] = value; + testname = (char *)s->testname; + qemu_log("TC %-16s %s\n", testname, (value) ? "FAILED" : "OK"); + break; + case R_TESTNAME: + s->regs[addr] = value; + copy_testname(s); + break; + + default: + error_report("lm32_sys: write access to unknown register 0x" + TARGET_FMT_plx, addr << 2); + break; + } +} + +static bool sys_ops_accepts(void *opaque, hwaddr addr, + unsigned size, bool is_write) +{ + return is_write && size == 4; +} + +static const MemoryRegionOps sys_ops = { + .write = sys_write, + .valid.accepts = sys_ops_accepts, + .endianness = DEVICE_NATIVE_ENDIAN, +}; + +static void sys_reset(DeviceState *d) +{ + LM32SysState *s = container_of(d, LM32SysState, busdev.qdev); + int i; + + for (i = 0; i < R_MAX; i++) { + s->regs[i] = 0; + } + memset(s->testname, 0, MAX_TESTNAME_LEN); +} + +static int lm32_sys_init(SysBusDevice *dev) +{ + LM32SysState *s = FROM_SYSBUS(typeof(*s), dev); + + memory_region_init_io(&s->iomem, &sys_ops , s, "sys", R_MAX * 4); + sysbus_init_mmio(dev, &s->iomem); + + /* Note: This device is not created in the board initialization, + * instead it has to be added with the -device parameter. Therefore, + * the device maps itself. */ + sysbus_mmio_map(dev, 0, s->base); + + return 0; +} + +static const VMStateDescription vmstate_lm32_sys = { + .name = "lm32-sys", + .version_id = 1, + .minimum_version_id = 1, + .minimum_version_id_old = 1, + .fields = (VMStateField[]) { + VMSTATE_UINT32_ARRAY(regs, LM32SysState, R_MAX), + VMSTATE_BUFFER(testname, LM32SysState), + VMSTATE_END_OF_LIST() + } +}; + +static Property lm32_sys_properties[] = { + DEFINE_PROP_UINT32("base", LM32SysState, base, 0xffff0000), + DEFINE_PROP_END_OF_LIST(), +}; + +static void lm32_sys_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass); + + k->init = lm32_sys_init; + dc->reset = sys_reset; + dc->vmsd = &vmstate_lm32_sys; + dc->props = lm32_sys_properties; +} + +static const TypeInfo lm32_sys_info = { + .name = "lm32-sys", + .parent = TYPE_SYS_BUS_DEVICE, + .instance_size = sizeof(LM32SysState), + .class_init = lm32_sys_class_init, +}; + +static void lm32_sys_register_types(void) +{ + type_register_static(&lm32_sys_info); +} + +type_init(lm32_sys_register_types) |