new file mode 100644
@@ -0,0 +1,52 @@
+/*
+ * QEMU lowRISC Ibex Timer device
+ *
+ * Copyright (c) 2021 Western Digital
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef HW_IBEX_TIMER_H
+#define HW_IBEX_TIMER_H
+
+#include "hw/sysbus.h"
+
+#define TYPE_IBEX_TIMER "ibex-timer"
+OBJECT_DECLARE_SIMPLE_TYPE(IbexTimerState, IBEX_TIMER)
+
+struct IbexTimerState {
+ /* <private> */
+ SysBusDevice parent_obj;
+
+ /* <public> */
+ MemoryRegion mmio;
+
+ uint32_t timer_ctrl;
+ uint32_t timer_cfg0;
+ uint32_t timer_compare_lower0;
+ uint32_t timer_compare_upper0;
+ uint32_t timer_intr_enable;
+ uint32_t timer_intr_state;
+ uint32_t timer_intr_test;
+
+ uint32_t timebase_freq;
+
+ qemu_irq irq;
+};
+#endif /* HW_IBEX_TIMER_H */
new file mode 100644
@@ -0,0 +1,305 @@
+/*
+ * QEMU lowRISC Ibex Timer device
+ *
+ * Copyright (c) 2021 Western Digital
+ *
+ * For details check the documentation here:
+ * https://docs.opentitan.org/hw/ip/rv_timer/doc/
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/log.h"
+#include "qemu/timer.h"
+#include "hw/timer/ibex_timer.h"
+#include "hw/irq.h"
+#include "hw/qdev-properties.h"
+#include "target/riscv/cpu.h"
+#include "migration/vmstate.h"
+
+REG32(CTRL, 0x00)
+ FIELD(CTRL, ACTIVE, 0, 1)
+REG32(CFG0, 0x100)
+ FIELD(CFG0, PRESCALE, 0, 12)
+ FIELD(CFG0, STEP, 16, 8)
+REG32(LOWER0, 0x104)
+REG32(UPPER0, 0x108)
+REG32(COMPARE_LOWER0, 0x10C)
+REG32(COMPARE_UPPER0, 0x110)
+REG32(INTR_ENABLE, 0x114)
+ FIELD(INTR_ENABLE, IE_0, 0, 1)
+REG32(INTR_STATE, 0x118)
+ FIELD(INTR_STATE, IS_0, 0, 1)
+REG32(INTR_TEST, 0x11C)
+ FIELD(INTR_TEST, T_0, 0, 1)
+
+static uint64_t cpu_riscv_read_rtc(uint32_t timebase_freq)
+{
+ return muldiv64(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL),
+ timebase_freq, NANOSECONDS_PER_SECOND);
+}
+
+static void ibex_timer_update_irqs(IbexTimerState *s)
+{
+ CPUState *cs = qemu_get_cpu(0);
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ uint64_t value = s->timer_compare_lower0 |
+ ((uint64_t)s->timer_compare_upper0 << 32);
+ uint64_t next, diff;
+ uint64_t now = cpu_riscv_read_rtc(s->timebase_freq);
+
+ if (!(s->timer_ctrl & R_CTRL_ACTIVE_MASK)) {
+ /* Timer isn't active */
+ return;
+ }
+
+ /* Update the CPUs mtimecmp */
+ cpu->env.timecmp = value;
+
+ if (cpu->env.timecmp <= now) {
+ /*
+ * If the mtimecmp was in the past raise the interrupt now.
+ */
+ riscv_cpu_update_mip(cpu, MIP_MTIP, BOOL_TO_MASK(1));
+ if (s->timer_intr_enable & R_INTR_ENABLE_IE_0_MASK) {
+ s->timer_intr_state |= R_INTR_STATE_IS_0_MASK;
+ qemu_set_irq(s->irq, true);
+ }
+ return;
+ }
+
+ /* Setup a timer to trigger the interrupt in the future */
+ riscv_cpu_update_mip(cpu, MIP_MTIP, BOOL_TO_MASK(0));
+ qemu_set_irq(s->irq, false);
+
+ diff = cpu->env.timecmp - now;
+ next = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
+ muldiv64(diff,
+ NANOSECONDS_PER_SECOND,
+ s->timebase_freq);
+
+ if (next < qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)) {
+ /* We overflowed the timer, just set it as large as we can */
+ timer_mod(cpu->env.timer, 0x7FFFFFFFFFFFFFFF);
+ } else {
+ timer_mod(cpu->env.timer, next);
+ }
+}
+
+static void ibex_timer_cb(void *opaque)
+{
+ IbexTimerState *s = opaque;
+ CPUState *cs = qemu_get_cpu(0);
+ RISCVCPU *cpu = RISCV_CPU(cs);
+
+ riscv_cpu_update_mip(cpu, MIP_MTIP, BOOL_TO_MASK(1));
+ if (s->timer_intr_enable & R_INTR_ENABLE_IE_0_MASK) {
+ s->timer_intr_state |= R_INTR_STATE_IS_0_MASK;
+ qemu_set_irq(s->irq, true);
+ }
+}
+
+static void ibex_timer_reset(DeviceState *dev)
+{
+ IbexTimerState *s = IBEX_TIMER(dev);
+
+ CPUState *cpu = qemu_get_cpu(0);
+ CPURISCVState *env = cpu->env_ptr;
+ env->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
+ &ibex_timer_cb, s);
+ env->timecmp = 0;
+
+ s->timer_ctrl = 0x00000000;
+ s->timer_cfg0 = 0x00010000;
+ s->timer_compare_lower0 = 0xFFFFFFFF;
+ s->timer_compare_upper0 = 0xFFFFFFFF;
+ s->timer_intr_enable = 0x00000000;
+ s->timer_intr_state = 0x00000000;
+ s->timer_intr_test = 0x00000000;
+
+ ibex_timer_update_irqs(s);
+}
+
+static uint64_t ibex_timer_read(void *opaque, hwaddr addr,
+ unsigned int size)
+{
+ IbexTimerState *s = opaque;
+ uint64_t now = cpu_riscv_read_rtc(s->timebase_freq);
+ uint64_t retvalue = 0;
+
+ switch (addr >> 2) {
+ case R_CTRL:
+ retvalue = s->timer_ctrl;
+ break;
+ case R_CFG0:
+ retvalue = s->timer_cfg0;
+ break;
+ case R_LOWER0:
+ retvalue = now;
+ break;
+ case R_UPPER0:
+ retvalue = now >> 32;
+ break;
+ case R_COMPARE_LOWER0:
+ retvalue = s->timer_compare_lower0;
+ break;
+ case R_COMPARE_UPPER0:
+ retvalue = s->timer_compare_upper0;
+ break;
+ case R_INTR_ENABLE:
+ retvalue = s->timer_intr_enable;
+ break;
+ case R_INTR_STATE:
+ retvalue = s->timer_intr_state;
+ break;
+ case R_INTR_TEST:
+ retvalue = s->timer_intr_test;
+ break;
+ default:
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "%s: Bad offset 0x%"HWADDR_PRIx"\n", __func__, addr);
+ return 0;
+ }
+
+ return retvalue;
+}
+
+static void ibex_timer_write(void *opaque, hwaddr addr,
+ uint64_t val64, unsigned int size)
+{
+ IbexTimerState *s = opaque;
+ uint32_t val = val64;
+
+ switch (addr >> 2) {
+ case R_CTRL:
+ s->timer_ctrl = val;
+ break;
+ case R_CFG0:
+ qemu_log_mask(LOG_UNIMP, "Changing prescale or step not supported");
+ s->timer_cfg0 = val;
+ break;
+ case R_LOWER0:
+ qemu_log_mask(LOG_UNIMP, "Changing timer value is not supported");
+ break;
+ case R_UPPER0:
+ qemu_log_mask(LOG_UNIMP, "Changing timer value is not supported");
+ break;
+ case R_COMPARE_LOWER0:
+ s->timer_compare_lower0 = val;
+ ibex_timer_update_irqs(s);
+ break;
+ case R_COMPARE_UPPER0:
+ s->timer_compare_upper0 = val;
+ ibex_timer_update_irqs(s);
+ break;
+ case R_INTR_ENABLE:
+ s->timer_intr_enable = val;
+ break;
+ case R_INTR_STATE:
+ /* Write 1 to clear */
+ s->timer_intr_state &= ~val;
+ break;
+ case R_INTR_TEST:
+ s->timer_intr_test = val;
+ if (s->timer_intr_enable &
+ s->timer_intr_test &
+ R_INTR_ENABLE_IE_0_MASK) {
+ s->timer_intr_state |= R_INTR_STATE_IS_0_MASK;
+ qemu_set_irq(s->irq, true);
+ }
+ break;
+ default:
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "%s: Bad offset 0x%"HWADDR_PRIx"\n", __func__, addr);
+ }
+}
+
+static const MemoryRegionOps ibex_timer_ops = {
+ .read = ibex_timer_read,
+ .write = ibex_timer_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+ .impl.min_access_size = 4,
+ .impl.max_access_size = 4,
+};
+
+static int ibex_timer_post_load(void *opaque, int version_id)
+{
+ IbexTimerState *s = opaque;
+
+ ibex_timer_update_irqs(s);
+ return 0;
+}
+
+static const VMStateDescription vmstate_ibex_timer = {
+ .name = TYPE_IBEX_TIMER,
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .post_load = ibex_timer_post_load,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT32(timer_ctrl, IbexTimerState),
+ VMSTATE_UINT32(timer_cfg0, IbexTimerState),
+ VMSTATE_UINT32(timer_compare_lower0, IbexTimerState),
+ VMSTATE_UINT32(timer_compare_upper0, IbexTimerState),
+ VMSTATE_UINT32(timer_intr_enable, IbexTimerState),
+ VMSTATE_UINT32(timer_intr_state, IbexTimerState),
+ VMSTATE_UINT32(timer_intr_test, IbexTimerState),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+static Property ibex_timer_properties[] = {
+ DEFINE_PROP_UINT32("timebase-freq", IbexTimerState, timebase_freq, 10000),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void ibex_timer_init(Object *obj)
+{
+ IbexTimerState *s = IBEX_TIMER(obj);
+
+ sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->irq);
+
+ memory_region_init_io(&s->mmio, obj, &ibex_timer_ops, s,
+ TYPE_IBEX_TIMER, 0x400);
+ sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->mmio);
+}
+
+static void ibex_timer_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+
+ dc->reset = ibex_timer_reset;
+ dc->vmsd = &vmstate_ibex_timer;
+ device_class_set_props(dc, ibex_timer_properties);
+}
+
+static const TypeInfo ibex_timer_info = {
+ .name = TYPE_IBEX_TIMER,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(IbexTimerState),
+ .instance_init = ibex_timer_init,
+ .class_init = ibex_timer_class_init,
+};
+
+static void ibex_timer_register_types(void)
+{
+ type_register_static(&ibex_timer_info);
+}
+
+type_init(ibex_timer_register_types)
@@ -1363,11 +1363,9 @@ M: Alistair Francis <Alistair.Francis@wdc.com>
L: qemu-riscv@nongnu.org
S: Supported
F: hw/riscv/opentitan.c
-F: hw/char/ibex_uart.c
-F: hw/intc/ibex_plic.c
+F: hw/*/ibex_*.c
F: include/hw/riscv/opentitan.h
-F: include/hw/char/ibex_uart.h
-F: include/hw/intc/ibex_plic.h
+F: include/hw/*/ibex_*.h
Microchip PolarFire SoC Icicle Kit
M: Bin Meng <bin.meng@windriver.com>
@@ -33,5 +33,6 @@ softmmu_ss.add(when: 'CONFIG_SSE_COUNTER', if_true: files('sse-counter.c'))
softmmu_ss.add(when: 'CONFIG_SSE_TIMER', if_true: files('sse-timer.c'))
softmmu_ss.add(when: 'CONFIG_STM32F2XX_TIMER', if_true: files('stm32f2xx_timer.c'))
softmmu_ss.add(when: 'CONFIG_XILINX', if_true: files('xilinx_timer.c'))
+specific_ss.add(when: 'CONFIG_IBEX', if_true: files('ibex_timer.c'))
specific_ss.add(when: 'CONFIG_AVR_TIMER16', if_true: files('avr_timer16.c'))
Add support for the Ibex timer. This is used with the RISC-V mtime/mtimecmp similar to the SiFive CLINT. We currently don't support changing the prescale or the timervalue. Signed-off-by: Alistair Francis <alistair.francis@wdc.com> --- include/hw/timer/ibex_timer.h | 52 ++++++ hw/timer/ibex_timer.c | 305 ++++++++++++++++++++++++++++++++++ MAINTAINERS | 6 +- hw/timer/meson.build | 1 + 4 files changed, 360 insertions(+), 4 deletions(-) create mode 100644 include/hw/timer/ibex_timer.h create mode 100644 hw/timer/ibex_timer.c