--- /dev/null
+/*
+ * QEMU model of the Milkymist System Controller.
+ *
+ * Copyright (c) 2010-2012 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/sysctl.pdf
+ */
+
+#include "hw/hw.h"
+#include "hw/sysbus.h"
+#include "sysemu/sysemu.h"
+#include "trace.h"
+#include "qemu/timer.h"
+#include "hw/ptimer.h"
+#include "qemu/error-report.h"
+
+enum {
+ CTRL_ENABLE = (1<<0),
+ CTRL_AUTORESTART = (1<<1),
+};
+
+enum {
+ ICAP_READY = (1<<0),
+};
+
+enum {
+ R_GPIO_IN = 0,
+ R_GPIO_OUT,
+ R_GPIO_INTEN,
+ R_TIMER0_CONTROL = 4,
+ R_TIMER0_COMPARE,
+ R_TIMER0_COUNTER,
+ R_TIMER1_CONTROL = 8,
+ R_TIMER1_COMPARE,
+ R_TIMER1_COUNTER,
+ R_ICAP = 16,
+ R_DBG_SCRATCHPAD = 20,
+ R_DBG_WRITE_LOCK,
+ R_CLK_FREQUENCY = 29,
+ R_CAPABILITIES,
+ R_SYSTEM_ID,
+ R_MAX
+};
+
+#define TYPE_MILKYMIST_SYSCTL "milkymist-sysctl"
+#define MILKYMIST_SYSCTL(obj) \
+ OBJECT_CHECK(MilkymistSysctlState, (obj), TYPE_MILKYMIST_SYSCTL)
+
+struct MilkymistSysctlState {
+ SysBusDevice parent_obj;
+
+ MemoryRegion regs_region;
+
+ QEMUBH *bh0;
+ QEMUBH *bh1;
+ ptimer_state *ptimer0;
+ ptimer_state *ptimer1;
+
+ uint32_t freq_hz;
+ uint32_t capabilities;
+ uint32_t systemid;
+ uint32_t strappings;
+
+ uint32_t regs[R_MAX];
+
+ qemu_irq gpio_irq;
+ qemu_irq timer0_irq;
+ qemu_irq timer1_irq;
+};
+typedef struct MilkymistSysctlState MilkymistSysctlState;
+
+static void sysctl_icap_write(MilkymistSysctlState *s, uint32_t value)
+{
+ trace_milkymist_sysctl_icap_write(value);
+ switch (value & 0xffff) {
+ case 0x000e:
+ qemu_system_shutdown_request();
+ break;
+ }
+}
+
+static uint64_t sysctl_read(void *opaque, hwaddr addr,
+ unsigned size)
+{
+ MilkymistSysctlState *s = opaque;
+ uint32_t r = 0;
+
+ addr >>= 2;
+ switch (addr) {
+ case R_TIMER0_COUNTER:
+ r = (uint32_t)ptimer_get_count(s->ptimer0);
+ /* milkymist timer counts up */
+ r = s->regs[R_TIMER0_COMPARE] - r;
+ break;
+ case R_TIMER1_COUNTER:
+ r = (uint32_t)ptimer_get_count(s->ptimer1);
+ /* milkymist timer counts up */
+ r = s->regs[R_TIMER1_COMPARE] - r;
+ break;
+ case R_GPIO_IN:
+ case R_GPIO_OUT:
+ case R_GPIO_INTEN:
+ case R_TIMER0_CONTROL:
+ case R_TIMER0_COMPARE:
+ case R_TIMER1_CONTROL:
+ case R_TIMER1_COMPARE:
+ case R_ICAP:
+ case R_DBG_SCRATCHPAD:
+ case R_DBG_WRITE_LOCK:
+ case R_CLK_FREQUENCY:
+ case R_CAPABILITIES:
+ case R_SYSTEM_ID:
+ r = s->regs[addr];
+ break;
+
+ default:
+ error_report("milkymist_sysctl: read access to unknown register 0x"
+ TARGET_FMT_plx, addr << 2);
+ break;
+ }
+
+ trace_milkymist_sysctl_memory_read(addr << 2, r);
+
+ return r;
+}
+
+static void sysctl_write(void *opaque, hwaddr addr, uint64_t value,
+ unsigned size)
+{
+ MilkymistSysctlState *s = opaque;
+
+ trace_milkymist_sysctl_memory_write(addr, value);
+
+ addr >>= 2;
+ switch (addr) {
+ case R_GPIO_OUT:
+ case R_GPIO_INTEN:
+ case R_TIMER0_COUNTER:
+ case R_TIMER1_COUNTER:
+ case R_DBG_SCRATCHPAD:
+ s->regs[addr] = value;
+ break;
+ case R_TIMER0_COMPARE:
+ ptimer_set_limit(s->ptimer0, value, 0);
+ s->regs[addr] = value;
+ break;
+ case R_TIMER1_COMPARE:
+ ptimer_set_limit(s->ptimer1, value, 0);
+ s->regs[addr] = value;
+ break;
+ case R_TIMER0_CONTROL:
+ s->regs[addr] = value;
+ if (s->regs[R_TIMER0_CONTROL] & CTRL_ENABLE) {
+ trace_milkymist_sysctl_start_timer0();
+ ptimer_set_count(s->ptimer0,
+ s->regs[R_TIMER0_COMPARE] - s->regs[R_TIMER0_COUNTER]);
+ ptimer_run(s->ptimer0, 0);
+ } else {
+ trace_milkymist_sysctl_stop_timer0();
+ ptimer_stop(s->ptimer0);
+ }
+ break;
+ case R_TIMER1_CONTROL:
+ s->regs[addr] = value;
+ if (s->regs[R_TIMER1_CONTROL] & CTRL_ENABLE) {
+ trace_milkymist_sysctl_start_timer1();
+ ptimer_set_count(s->ptimer1,
+ s->regs[R_TIMER1_COMPARE] - s->regs[R_TIMER1_COUNTER]);
+ ptimer_run(s->ptimer1, 0);
+ } else {
+ trace_milkymist_sysctl_stop_timer1();
+ ptimer_stop(s->ptimer1);
+ }
+ break;
+ case R_ICAP:
+ sysctl_icap_write(s, value);
+ break;
+ case R_DBG_WRITE_LOCK:
+ s->regs[addr] = 1;
+ break;
+ case R_SYSTEM_ID:
+ qemu_system_reset_request();
+ break;
+
+ case R_GPIO_IN:
+ case R_CLK_FREQUENCY:
+ case R_CAPABILITIES:
+ error_report("milkymist_sysctl: write to read-only register 0x"
+ TARGET_FMT_plx, addr << 2);
+ break;
+
+ default:
+ error_report("milkymist_sysctl: write access to unknown register 0x"
+ TARGET_FMT_plx, addr << 2);
+ break;
+ }
+}
+
+static const MemoryRegionOps sysctl_mmio_ops = {
+ .read = sysctl_read,
+ .write = sysctl_write,
+ .valid = {
+ .min_access_size = 4,
+ .max_access_size = 4,
+ },
+ .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+static void timer0_hit(void *opaque)
+{
+ MilkymistSysctlState *s = opaque;
+
+ if (!(s->regs[R_TIMER0_CONTROL] & CTRL_AUTORESTART)) {
+ s->regs[R_TIMER0_CONTROL] &= ~CTRL_ENABLE;
+ trace_milkymist_sysctl_stop_timer0();
+ ptimer_stop(s->ptimer0);
+ }
+
+ trace_milkymist_sysctl_pulse_irq_timer0();
+ qemu_irq_pulse(s->timer0_irq);
+}
+
+static void timer1_hit(void *opaque)
+{
+ MilkymistSysctlState *s = opaque;
+
+ if (!(s->regs[R_TIMER1_CONTROL] & CTRL_AUTORESTART)) {
+ s->regs[R_TIMER1_CONTROL] &= ~CTRL_ENABLE;
+ trace_milkymist_sysctl_stop_timer1();
+ ptimer_stop(s->ptimer1);
+ }
+
+ trace_milkymist_sysctl_pulse_irq_timer1();
+ qemu_irq_pulse(s->timer1_irq);
+}
+
+static void milkymist_sysctl_reset(DeviceState *d)
+{
+ MilkymistSysctlState *s = MILKYMIST_SYSCTL(d);
+ int i;
+
+ for (i = 0; i < R_MAX; i++) {
+ s->regs[i] = 0;
+ }
+
+ ptimer_stop(s->ptimer0);
+ ptimer_stop(s->ptimer1);
+
+ /* defaults */
+ s->regs[R_ICAP] = ICAP_READY;
+ s->regs[R_SYSTEM_ID] = s->systemid;
+ s->regs[R_CLK_FREQUENCY] = s->freq_hz;
+ s->regs[R_CAPABILITIES] = s->capabilities;
+ s->regs[R_GPIO_IN] = s->strappings;
+}
+
+static int milkymist_sysctl_init(SysBusDevice *dev)
+{
+ MilkymistSysctlState *s = MILKYMIST_SYSCTL(dev);
+
+ sysbus_init_irq(dev, &s->gpio_irq);
+ sysbus_init_irq(dev, &s->timer0_irq);
+ sysbus_init_irq(dev, &s->timer1_irq);
+
+ s->bh0 = qemu_bh_new(timer0_hit, s);
+ s->bh1 = qemu_bh_new(timer1_hit, s);
+ s->ptimer0 = ptimer_init(s->bh0);
+ s->ptimer1 = ptimer_init(s->bh1);
+ ptimer_set_freq(s->ptimer0, s->freq_hz);
+ ptimer_set_freq(s->ptimer1, s->freq_hz);
+
+ memory_region_init_io(&s->regs_region, OBJECT(s), &sysctl_mmio_ops, s,
+ "milkymist-sysctl", R_MAX * 4);
+ sysbus_init_mmio(dev, &s->regs_region);
+
+ return 0;
+}
+
+static const VMStateDescription vmstate_milkymist_sysctl = {
+ .name = "milkymist-sysctl",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT32_ARRAY(regs, MilkymistSysctlState, R_MAX),
+ VMSTATE_PTIMER(ptimer0, MilkymistSysctlState),
+ VMSTATE_PTIMER(ptimer1, MilkymistSysctlState),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+static Property milkymist_sysctl_properties[] = {
+ DEFINE_PROP_UINT32("frequency", MilkymistSysctlState,
+ freq_hz, 80000000),
+ DEFINE_PROP_UINT32("capabilities", MilkymistSysctlState,
+ capabilities, 0x00000000),
+ DEFINE_PROP_UINT32("systemid", MilkymistSysctlState,
+ systemid, 0x10014d31),
+ DEFINE_PROP_UINT32("gpio_strappings", MilkymistSysctlState,
+ strappings, 0x00000001),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void milkymist_sysctl_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
+
+ k->init = milkymist_sysctl_init;
+ dc->reset = milkymist_sysctl_reset;
+ dc->vmsd = &vmstate_milkymist_sysctl;
+ dc->props = milkymist_sysctl_properties;
+}
+
+static const TypeInfo milkymist_sysctl_info = {
+ .name = TYPE_MILKYMIST_SYSCTL,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(MilkymistSysctlState),
+ .class_init = milkymist_sysctl_class_init,
+};
+
+static void milkymist_sysctl_register_types(void)
+{
+ type_register_static(&milkymist_sysctl_info);
+}
+
+type_init(milkymist_sysctl_register_types)
Code Review / kvmfornfv.git / blobdiff