diff options
Diffstat (limited to 'hw/misc/milkymist-hpdmc.c')
| -rw-r--r-- | hw/misc/milkymist-hpdmc.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/hw/misc/milkymist-hpdmc.c b/hw/misc/milkymist-hpdmc.c new file mode 100644 index 0000000000..d922f6ffad --- /dev/null +++ b/hw/misc/milkymist-hpdmc.c @@ -0,0 +1,170 @@ +/* + * QEMU model of the Milkymist High Performance Dynamic Memory Controller. + * + * 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/>. + * + * + * Specification available at: + * http://www.milkymist.org/socdoc/hpdmc.pdf + */ + +#include "hw/hw.h" +#include "hw/sysbus.h" +#include "trace.h" +#include "qemu/error-report.h" + +enum { + R_SYSTEM = 0, + R_BYPASS, + R_TIMING, + R_IODELAY, + R_MAX +}; + +enum { + IODELAY_DQSDELAY_RDY = (1<<5), + IODELAY_PLL1_LOCKED = (1<<6), + IODELAY_PLL2_LOCKED = (1<<7), +}; + +struct MilkymistHpdmcState { + SysBusDevice busdev; + MemoryRegion regs_region; + + uint32_t regs[R_MAX]; +}; +typedef struct MilkymistHpdmcState MilkymistHpdmcState; + +static uint64_t hpdmc_read(void *opaque, hwaddr addr, + unsigned size) +{ + MilkymistHpdmcState *s = opaque; + uint32_t r = 0; + + addr >>= 2; + switch (addr) { + case R_SYSTEM: + case R_BYPASS: + case R_TIMING: + case R_IODELAY: + r = s->regs[addr]; + break; + + default: + error_report("milkymist_hpdmc: read access to unknown register 0x" + TARGET_FMT_plx, addr << 2); + break; + } + + trace_milkymist_hpdmc_memory_read(addr << 2, r); + + return r; +} + +static void hpdmc_write(void *opaque, hwaddr addr, uint64_t value, + unsigned size) +{ + MilkymistHpdmcState *s = opaque; + + trace_milkymist_hpdmc_memory_write(addr, value); + + addr >>= 2; + switch (addr) { + case R_SYSTEM: + case R_BYPASS: + case R_TIMING: + s->regs[addr] = value; + break; + case R_IODELAY: + /* ignore writes */ + break; + + default: + error_report("milkymist_hpdmc: write access to unknown register 0x" + TARGET_FMT_plx, addr << 2); + break; + } +} + +static const MemoryRegionOps hpdmc_mmio_ops = { + .read = hpdmc_read, + .write = hpdmc_write, + .valid = { + .min_access_size = 4, + .max_access_size = 4, + }, + .endianness = DEVICE_NATIVE_ENDIAN, +}; + +static void milkymist_hpdmc_reset(DeviceState *d) +{ + MilkymistHpdmcState *s = container_of(d, MilkymistHpdmcState, busdev.qdev); + int i; + + for (i = 0; i < R_MAX; i++) { + s->regs[i] = 0; + } + + /* defaults */ + s->regs[R_IODELAY] = IODELAY_DQSDELAY_RDY | IODELAY_PLL1_LOCKED + | IODELAY_PLL2_LOCKED; +} + +static int milkymist_hpdmc_init(SysBusDevice *dev) +{ + MilkymistHpdmcState *s = FROM_SYSBUS(typeof(*s), dev); + + memory_region_init_io(&s->regs_region, &hpdmc_mmio_ops, s, + "milkymist-hpdmc", R_MAX * 4); + sysbus_init_mmio(dev, &s->regs_region); + + return 0; +} + +static const VMStateDescription vmstate_milkymist_hpdmc = { + .name = "milkymist-hpdmc", + .version_id = 1, + .minimum_version_id = 1, + .minimum_version_id_old = 1, + .fields = (VMStateField[]) { + VMSTATE_UINT32_ARRAY(regs, MilkymistHpdmcState, R_MAX), + VMSTATE_END_OF_LIST() + } +}; + +static void milkymist_hpdmc_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass); + + k->init = milkymist_hpdmc_init; + dc->reset = milkymist_hpdmc_reset; + dc->vmsd = &vmstate_milkymist_hpdmc; +} + +static const TypeInfo milkymist_hpdmc_info = { + .name = "milkymist-hpdmc", + .parent = TYPE_SYS_BUS_DEVICE, + .instance_size = sizeof(MilkymistHpdmcState), + .class_init = milkymist_hpdmc_class_init, +}; + +static void milkymist_hpdmc_register_types(void) +{ + type_register_static(&milkymist_hpdmc_info); +} + +type_init(milkymist_hpdmc_register_types) |