| /* |
| * 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.h" |
| #include "sysbus.h" |
| #include "trace.h" |
| #include "qemu-error.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, target_phys_addr_t 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, target_phys_addr_t 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 SysBusDeviceInfo milkymist_hpdmc_info = { |
| .init = milkymist_hpdmc_init, |
| .qdev.name = "milkymist-hpdmc", |
| .qdev.size = sizeof(MilkymistHpdmcState), |
| .qdev.vmsd = &vmstate_milkymist_hpdmc, |
| .qdev.reset = milkymist_hpdmc_reset, |
| }; |
| |
| static void milkymist_hpdmc_register(void) |
| { |
| sysbus_register_withprop(&milkymist_hpdmc_info); |
| } |
| |
| device_init(milkymist_hpdmc_register) |