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-rw-r--r--qemu/hw/misc/milkymist-hpdmc.c174
1 files changed, 174 insertions, 0 deletions
diff --git a/qemu/hw/misc/milkymist-hpdmc.c b/qemu/hw/misc/milkymist-hpdmc.c
new file mode 100644
index 000000000..f5f4c1b34
--- /dev/null
+++ b/qemu/hw/misc/milkymist-hpdmc.c
@@ -0,0 +1,174 @@
+/*
+ * 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),
+};
+
+#define TYPE_MILKYMIST_HPDMC "milkymist-hpdmc"
+#define MILKYMIST_HPDMC(obj) \
+ OBJECT_CHECK(MilkymistHpdmcState, (obj), TYPE_MILKYMIST_HPDMC)
+
+struct MilkymistHpdmcState {
+ SysBusDevice parent_obj;
+
+ 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 = MILKYMIST_HPDMC(d);
+ 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 = MILKYMIST_HPDMC(dev);
+
+ memory_region_init_io(&s->regs_region, OBJECT(dev), &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,
+ .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 = TYPE_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)