* [PATCH v3 1/2] hw/timer: Add SiFive PWM support
2021-09-09 3:54 [PATCH v3 0/2] Add the SiFive PWM device Alistair Francis
@ 2021-09-09 3:55 ` Alistair Francis
2021-09-09 4:36 ` Bin Meng
2021-09-09 3:55 ` [PATCH v3 2/2] sifive_u: Connect the SiFive PWM device Alistair Francis
1 sibling, 1 reply; 6+ messages in thread
From: Alistair Francis @ 2021-09-09 3:55 UTC (permalink / raw)
To: qemu-devel, qemu-riscv; +Cc: bmeng.cn, palmer, alistair.francis, alistair23
From: Alistair Francis <alistair.francis@wdc.com>
This is the initial commit of the SiFive PWM timer. This is used by
guest software as a timer and is included in the SiFive FU540 SoC.
Signed-off-by: Justin Restivo <jrestivo@draper.com>
Signed-off-by: Alexandra Clifford <aclifford@draper.com>
Signed-off-by: Amanda Strnad <astrnad@draper.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
---
include/hw/timer/sifive_pwm.h | 62 +++++
hw/timer/sifive_pwm.c | 467 ++++++++++++++++++++++++++++++++++
hw/timer/Kconfig | 3 +
hw/timer/meson.build | 1 +
hw/timer/trace-events | 6 +
5 files changed, 539 insertions(+)
create mode 100644 include/hw/timer/sifive_pwm.h
create mode 100644 hw/timer/sifive_pwm.c
diff --git a/include/hw/timer/sifive_pwm.h b/include/hw/timer/sifive_pwm.h
new file mode 100644
index 0000000000..6a8cf7b29e
--- /dev/null
+++ b/include/hw/timer/sifive_pwm.h
@@ -0,0 +1,62 @@
+/*
+ * SiFive PWM
+ *
+ * Copyright (c) 2020 Western Digital
+ *
+ * Author: Alistair Francis <alistair.francis@wdc.com>
+ *
+ * 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_SIFIVE_PWM_H
+#define HW_SIFIVE_PWM_H
+
+#include "hw/sysbus.h"
+#include "qemu/timer.h"
+#include "qom/object.h"
+
+#define TYPE_SIFIVE_PWM "sifive-pwm"
+
+#define SIFIVE_PWM(obj) \
+ OBJECT_CHECK(SiFivePwmState, (obj), TYPE_SIFIVE_PWM)
+
+#define SIFIVE_PWM_CHANS 4
+#define SIFIVE_PWM_IRQS SIFIVE_PWM_CHANS
+
+typedef struct SiFivePwmState {
+ /* <private> */
+ SysBusDevice parent_obj;
+
+ /* <public> */
+ MemoryRegion mmio;
+ QEMUTimer timer[SIFIVE_PWM_CHANS];
+ /*
+ * if en bit(s) set, is the number of ticks when pwmcount was 0
+ * if en bit(s) not set, is the number of ticks in pwmcount
+ */
+ uint64_t tick_offset;
+ uint64_t freq_hz;
+
+ uint32_t pwmcfg;
+ uint32_t pwmcmp[SIFIVE_PWM_CHANS];
+
+ qemu_irq irqs[SIFIVE_PWM_IRQS];
+} SiFivePwmState;
+
+#endif /* HW_SIFIVE_PWM_H */
diff --git a/hw/timer/sifive_pwm.c b/hw/timer/sifive_pwm.c
new file mode 100644
index 0000000000..5565ff812a
--- /dev/null
+++ b/hw/timer/sifive_pwm.c
@@ -0,0 +1,467 @@
+/*
+ * SiFive PWM
+ *
+ * Copyright (c) 2020 Western Digital
+ *
+ * Author: Alistair Francis <alistair.francis@wdc.com>
+ *
+ * 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 "hw/irq.h"
+#include "hw/timer/sifive_pwm.h"
+#include "hw/qdev-properties.h"
+#include "hw/registerfields.h"
+#include "migration/vmstate.h"
+#include "qemu/log.h"
+#include "qemu/module.h"
+
+#define HAS_PWM_EN_BITS(cfg) ((cfg & R_CONFIG_ENONESHOT_MASK) || \
+ (cfg & R_CONFIG_ENALWAYS_MASK))
+
+#define PWMCMP_MASK 0xFFFF
+#define PWMCOUNT_MASK 0x7FFFFFFF
+
+REG32(CONFIG, 0x00)
+ FIELD(CONFIG, SCALE, 0, 4)
+ FIELD(CONFIG, STICKY, 8, 1)
+ FIELD(CONFIG, ZEROCMP, 9, 1)
+ FIELD(CONFIG, DEGLITCH, 10, 1)
+ FIELD(CONFIG, ENALWAYS, 12, 1)
+ FIELD(CONFIG, ENONESHOT, 13, 1)
+ FIELD(CONFIG, CMP0CENTER, 16, 1)
+ FIELD(CONFIG, CMP1CENTER, 17, 1)
+ FIELD(CONFIG, CMP2CENTER, 18, 1)
+ FIELD(CONFIG, CMP3CENTER, 19, 1)
+ FIELD(CONFIG, CMP0GANG, 24, 1)
+ FIELD(CONFIG, CMP1GANG, 25, 1)
+ FIELD(CONFIG, CMP2GANG, 26, 1)
+ FIELD(CONFIG, CMP3GANG, 27, 1)
+ FIELD(CONFIG, CMP0IP, 28, 1)
+ FIELD(CONFIG, CMP1IP, 29, 1)
+ FIELD(CONFIG, CMP2IP, 30, 1)
+ FIELD(CONFIG, CMP3IP, 31, 1)
+REG32(COUNT, 0x08)
+REG32(PWMS, 0x10)
+REG32(PWMCMP0, 0x20)
+REG32(PWMCMP1, 0x24)
+REG32(PWMCMP2, 0x28)
+REG32(PWMCMP3, 0x2C)
+
+static inline uint64_t sifive_pwm_ns_to_ticks(SiFivePwmState *s,
+ uint64_t time)
+{
+ return muldiv64(time, s->freq_hz, NANOSECONDS_PER_SECOND);
+}
+
+static inline uint64_t sifive_pwm_ticks_to_ns(SiFivePwmState *s,
+ uint64_t ticks)
+{
+ return muldiv64(ticks, NANOSECONDS_PER_SECOND, s->freq_hz);
+}
+
+static inline uint64_t sifive_pwm_compute_scale(SiFivePwmState *s)
+{
+ return s->pwmcfg & R_CONFIG_SCALE_MASK;
+}
+
+static void sifive_pwm_set_alarms(SiFivePwmState *s)
+{
+ uint64_t now_ns = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
+
+ if (HAS_PWM_EN_BITS(s->pwmcfg)) {
+ /*
+ * Subtract ticks from number of ticks when the timer was zero
+ * and mask to the register width.
+ */
+ uint64_t pwmcount = (sifive_pwm_ns_to_ticks(s, now_ns) -
+ s->tick_offset) & PWMCOUNT_MASK;
+ uint64_t scale = sifive_pwm_compute_scale(s);
+ /* PWMs only contains PWMCMP_MASK bits starting at scale */
+ uint64_t pwms = (pwmcount & (PWMCMP_MASK << scale)) >> scale;
+
+ for (int i = 0; i < SIFIVE_PWM_CHANS; i++) {
+ uint64_t pwmcmp = s->pwmcmp[i] & PWMCMP_MASK;
+ uint64_t pwmcmp_ticks = pwmcmp << scale;
+
+ /*
+ * Per circuit diagram and spec, both cases raises corresponding
+ * IP bit one clock cycle after time expires.
+ */
+ if (pwmcmp > pwms) {
+ uint64_t offset = pwmcmp_ticks - pwmcount + 1;
+ uint64_t when_to_fire = now_ns +
+ sifive_pwm_ticks_to_ns(s, offset);
+
+ trace_sifive_pwm_set_alarm(when_to_fire, now_ns);
+ timer_mod(&s->timer[i], when_to_fire);
+ } else {
+ /* Schedule interrupt for next cycle */
+ trace_sifive_pwm_set_alarm(now_ns + 1, now_ns);
+ timer_mod(&s->timer[i], now_ns + 1);
+ }
+
+ }
+ } else {
+ /*
+ * If timer incrementing disabled, just do pwms > pwmcmp check since
+ * a write may have happened to PWMs.
+ */
+ uint64_t pwmcount = (s->tick_offset) & PWMCOUNT_MASK;
+ uint64_t scale = sifive_pwm_compute_scale(s);
+ uint64_t pwms = (pwmcount & (PWMCMP_MASK << scale)) >> scale;
+
+ for (int i = 0; i < SIFIVE_PWM_CHANS; i++) {
+ uint64_t pwmcmp = s->pwmcmp[i] & PWMCMP_MASK;
+
+ if (pwms >= pwmcmp) {
+ trace_sifive_pwm_set_alarm(now_ns + 1, now_ns);
+ timer_mod(&s->timer[i], now_ns + 1);
+ } else {
+ /* Effectively disable timer by scheduling far in future. */
+ trace_sifive_pwm_set_alarm(0xFFFFFFFFFFFFFF, now_ns);
+ timer_mod(&s->timer[i], 0xFFFFFFFFFFFFFF);
+ }
+ }
+ }
+}
+
+static void sifive_pwm_interrupt(SiFivePwmState *s, int num)
+{
+ uint64_t now = sifive_pwm_ns_to_ticks(s,
+ qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
+ bool was_incrementing = HAS_PWM_EN_BITS(s->pwmcfg);
+
+ trace_sifive_pwm_interrupt(num);
+
+ s->pwmcfg |= R_CONFIG_CMP0IP_MASK << num;
+ qemu_irq_raise(s->irqs[num]);
+
+ /*
+ * If the zerocmp is set and pwmcmp0 raised the interrupt
+ * reset the zero ticks.
+ */
+ if ((s->pwmcfg & R_CONFIG_ZEROCMP_MASK) && (num == 0)) {
+ /* If reset signal conditions, disable ENONESHOT. */
+ s->pwmcfg &= ~R_CONFIG_ENONESHOT_MASK;
+
+ if (was_incrementing) {
+ /* If incrementing, time in ticks is when pwmcount is zero */
+ s->tick_offset = now;
+ } else {
+ /* If not incrementing, pwmcount = 0 */
+ s->tick_offset = 0;
+ }
+ }
+
+ /*
+ * If carryout bit set, which we discern via looking for overflow,
+ * also reset ENONESHOT.
+ */
+ if (was_incrementing &&
+ ((now & PWMCOUNT_MASK) < (s->tick_offset & PWMCOUNT_MASK))) {
+ s->pwmcfg &= ~R_CONFIG_ENONESHOT_MASK;
+ }
+
+ /* Schedule or disable interrupts */
+ sifive_pwm_set_alarms(s);
+
+ /* If was enabled, and now not enabled, switch tick rep */
+ if (was_incrementing && !HAS_PWM_EN_BITS(s->pwmcfg)) {
+ s->tick_offset = (now - s->tick_offset) & PWMCOUNT_MASK;
+ }
+}
+
+static void sifive_pwm_interrupt_0(void *opaque)
+{
+ SiFivePwmState *s = opaque;
+
+ sifive_pwm_interrupt(s, 0);
+}
+
+static void sifive_pwm_interrupt_1(void *opaque)
+{
+ SiFivePwmState *s = opaque;
+
+ sifive_pwm_interrupt(s, 1);
+}
+
+static void sifive_pwm_interrupt_2(void *opaque)
+{
+ SiFivePwmState *s = opaque;
+
+ sifive_pwm_interrupt(s, 2);
+}
+
+static void sifive_pwm_interrupt_3(void *opaque)
+{
+ SiFivePwmState *s = opaque;
+
+ sifive_pwm_interrupt(s, 3);
+}
+
+static uint64_t sifive_pwm_read(void *opaque, hwaddr addr,
+ unsigned int size)
+{
+ SiFivePwmState *s = opaque;
+ uint64_t cur_time, scale;
+ uint64_t now = sifive_pwm_ns_to_ticks(s,
+ qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
+
+ trace_sifive_pwm_read(addr);
+
+ switch (addr) {
+ case A_CONFIG:
+ return s->pwmcfg;
+ case A_COUNT:
+ cur_time = s->tick_offset;
+
+ if (HAS_PWM_EN_BITS(s->pwmcfg)) {
+ cur_time = now - cur_time;
+ }
+
+ /*
+ * Return the value in the counter with bit 31 always 0
+ * This is allowed to wrap around so we don't need to check that.
+ */
+ return cur_time & PWMCOUNT_MASK;
+ case A_PWMS:
+ cur_time = s->tick_offset;
+ scale = sifive_pwm_compute_scale(s);
+
+ if (HAS_PWM_EN_BITS(s->pwmcfg)) {
+ cur_time = now - cur_time;
+ }
+
+ return ((cur_time & PWMCOUNT_MASK) >> scale) & PWMCMP_MASK;
+ case A_PWMCMP0:
+ return s->pwmcmp[0] & PWMCMP_MASK;
+ case A_PWMCMP1:
+ return s->pwmcmp[1] & PWMCMP_MASK;
+ case A_PWMCMP2:
+ return s->pwmcmp[2] & PWMCMP_MASK;
+ case A_PWMCMP3:
+ return s->pwmcmp[3] & PWMCMP_MASK;
+ default:
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "%s: Bad offset 0x%"HWADDR_PRIx"\n", __func__, addr);
+ return 0;
+ }
+
+ return 0;
+}
+
+static void sifive_pwm_write(void *opaque, hwaddr addr,
+ uint64_t val64, unsigned int size)
+{
+ SiFivePwmState *s = opaque;
+ uint32_t value = val64;
+ uint64_t new_offset, scale;
+ uint64_t now = sifive_pwm_ns_to_ticks(s,
+ qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
+
+ trace_sifive_pwm_write(value, addr);
+
+ switch (addr) {
+ case A_CONFIG:
+ if (value & (R_CONFIG_CMP0CENTER_MASK | R_CONFIG_CMP1CENTER_MASK |
+ R_CONFIG_CMP2CENTER_MASK | R_CONFIG_CMP3CENTER_MASK)) {
+ qemu_log_mask(LOG_UNIMP, "%s: CMPxCENTER is not supported\n",
+ __func__);
+ }
+
+ if (value & (R_CONFIG_CMP0GANG_MASK | R_CONFIG_CMP1GANG_MASK |
+ R_CONFIG_CMP2GANG_MASK | R_CONFIG_CMP3GANG_MASK)) {
+ qemu_log_mask(LOG_UNIMP, "%s: CMPxGANG is not supported\n",
+ __func__);
+ }
+
+ if (value & (R_CONFIG_CMP0IP_MASK | R_CONFIG_CMP1IP_MASK |
+ R_CONFIG_CMP2IP_MASK | R_CONFIG_CMP3IP_MASK)) {
+ qemu_log_mask(LOG_UNIMP, "%s: CMPxIP is not supported\n",
+ __func__);
+ }
+
+ if (!(value & R_CONFIG_CMP0IP_MASK)) {
+ qemu_irq_lower(s->irqs[0]);
+ }
+
+ if (!(value & R_CONFIG_CMP1IP_MASK)) {
+ qemu_irq_lower(s->irqs[1]);
+ }
+
+ if (!(value & R_CONFIG_CMP2IP_MASK)) {
+ qemu_irq_lower(s->irqs[2]);
+ }
+
+ if (!(value & R_CONFIG_CMP3IP_MASK)) {
+ qemu_irq_lower(s->irqs[3]);
+ }
+
+ /*
+ * If this write enables the timer increment
+ * set the time when pwmcount was zero to be cur_time - pwmcount.
+ * If this write disables the timer increment
+ * convert back from pwmcount to the time in ticks
+ * when pwmcount was zero.
+ */
+ if ((!HAS_PWM_EN_BITS(s->pwmcfg) && HAS_PWM_EN_BITS(value)) ||
+ (HAS_PWM_EN_BITS(s->pwmcfg) && !HAS_PWM_EN_BITS(value))) {
+ s->tick_offset = (now - s->tick_offset) & PWMCOUNT_MASK;
+ }
+
+ s->pwmcfg = value;
+ break;
+ case A_COUNT:
+ /* The guest changed the counter, updated the offset value. */
+ new_offset = value;
+
+ if (HAS_PWM_EN_BITS(s->pwmcfg)) {
+ new_offset = now - new_offset;
+ }
+
+ s->tick_offset = new_offset;
+ break;
+ case A_PWMS:
+ scale = sifive_pwm_compute_scale(s);
+ new_offset = (((value & PWMCMP_MASK) << scale) & PWMCOUNT_MASK);
+
+ if (HAS_PWM_EN_BITS(s->pwmcfg)) {
+ new_offset = now - new_offset;
+ }
+
+ s->tick_offset = new_offset;
+ break;
+ case A_PWMCMP0:
+ s->pwmcmp[0] = value & PWMCMP_MASK;
+ break;
+ case A_PWMCMP1:
+ s->pwmcmp[1] = value & PWMCMP_MASK;
+ break;
+ case A_PWMCMP2:
+ s->pwmcmp[2] = value & PWMCMP_MASK;
+ break;
+ case A_PWMCMP3:
+ s->pwmcmp[3] = value & PWMCMP_MASK;
+ break;
+ default:
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "%s: Bad offset 0x%"HWADDR_PRIx"\n", __func__, addr);
+ }
+
+ /* Update the alarms to reflect possible updated values */
+ sifive_pwm_set_alarms(s);
+}
+
+static void sifive_pwm_reset(DeviceState *dev)
+{
+ SiFivePwmState *s = SIFIVE_PWM(dev);
+ uint64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
+
+ s->pwmcfg = 0x00000000;
+ s->pwmcmp[0] = 0x00000000;
+ s->pwmcmp[1] = 0x00000000;
+ s->pwmcmp[2] = 0x00000000;
+ s->pwmcmp[3] = 0x00000000;
+
+ s->tick_offset = sifive_pwm_ns_to_ticks(s, now);
+}
+
+static const MemoryRegionOps sifive_pwm_ops = {
+ .read = sifive_pwm_read,
+ .write = sifive_pwm_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+static const VMStateDescription vmstate_sifive_pwm = {
+ .name = TYPE_SIFIVE_PWM,
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .fields = (VMStateField[]) {
+ VMSTATE_TIMER_ARRAY(timer, SiFivePwmState, 4),
+ VMSTATE_UINT64(tick_offset, SiFivePwmState),
+ VMSTATE_UINT32(pwmcfg, SiFivePwmState),
+ VMSTATE_UINT32_ARRAY(pwmcmp, SiFivePwmState, 4),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+static Property sifive_pwm_properties[] = {
+ /* 0.5Ghz per spec after FSBL */
+ DEFINE_PROP_UINT64("clock-frequency", struct SiFivePwmState,
+ freq_hz, 500000000ULL),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void sifive_pwm_init(Object *obj)
+{
+ SiFivePwmState *s = SIFIVE_PWM(obj);
+ int i;
+
+ for (i = 0; i < SIFIVE_PWM_IRQS; i++) {
+ sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->irqs[i]);
+ }
+
+ memory_region_init_io(&s->mmio, obj, &sifive_pwm_ops, s,
+ TYPE_SIFIVE_PWM, 0x100);
+ sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->mmio);
+}
+
+static void sifive_pwm_realize(DeviceState *dev, Error **errp)
+{
+ SiFivePwmState *s = SIFIVE_PWM(dev);
+
+ timer_init_ns(&s->timer[0], QEMU_CLOCK_VIRTUAL,
+ sifive_pwm_interrupt_0, s);
+
+ timer_init_ns(&s->timer[1], QEMU_CLOCK_VIRTUAL,
+ sifive_pwm_interrupt_1, s);
+
+ timer_init_ns(&s->timer[2], QEMU_CLOCK_VIRTUAL,
+ sifive_pwm_interrupt_2, s);
+
+ timer_init_ns(&s->timer[3], QEMU_CLOCK_VIRTUAL,
+ sifive_pwm_interrupt_3, s);
+}
+
+static void sifive_pwm_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+
+ dc->reset = sifive_pwm_reset;
+ device_class_set_props(dc, sifive_pwm_properties);
+ dc->vmsd = &vmstate_sifive_pwm;
+ dc->realize = sifive_pwm_realize;
+}
+
+static const TypeInfo sifive_pwm_info = {
+ .name = TYPE_SIFIVE_PWM,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(SiFivePwmState),
+ .instance_init = sifive_pwm_init,
+ .class_init = sifive_pwm_class_init,
+};
+
+static void sifive_pwm_register_types(void)
+{
+ type_register_static(&sifive_pwm_info);
+}
+
+type_init(sifive_pwm_register_types)
diff --git a/hw/timer/Kconfig b/hw/timer/Kconfig
index 1e73da7e12..010be7ed1f 100644
--- a/hw/timer/Kconfig
+++ b/hw/timer/Kconfig
@@ -25,6 +25,9 @@ config ALLWINNER_A10_PIT
bool
select PTIMER
+config SIFIVE_PWM
+ bool
+
config STM32F2XX_TIMER
bool
diff --git a/hw/timer/meson.build b/hw/timer/meson.build
index e67478a8f1..03092e2ceb 100644
--- a/hw/timer/meson.build
+++ b/hw/timer/meson.build
@@ -35,5 +35,6 @@ softmmu_ss.add(when: 'CONFIG_STELLARIS_GPTM', if_true: files('stellaris-gptm.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'))
+softmmu_ss.add(when: 'CONFIG_SIFIVE_PWM', if_true: files('sifive_pwm.c'))
specific_ss.add(when: 'CONFIG_AVR_TIMER16', if_true: files('avr_timer16.c'))
diff --git a/hw/timer/trace-events b/hw/timer/trace-events
index 5234c0ea9e..d0edcd2a80 100644
--- a/hw/timer/trace-events
+++ b/hw/timer/trace-events
@@ -88,3 +88,9 @@ sse_counter_reset(void) "SSE system counter: reset"
sse_timer_read(uint64_t offset, uint64_t data, unsigned size) "SSE system timer read: offset 0x%" PRIx64 " data 0x%" PRIx64 " size %u"
sse_timer_write(uint64_t offset, uint64_t data, unsigned size) "SSE system timer write: offset 0x%" PRIx64 " data 0x%" PRIx64 " size %u"
sse_timer_reset(void) "SSE system timer: reset"
+
+# sifive_pwm.c
+sifive_pwm_set_alarm(uint64_t alarm, uint64_t now) "Setting alarm to: 0x%" PRIx64 ", now: 0x%" PRIx64
+sifive_pwm_interrupt(int num) "Interrupt %d"
+sifive_pwm_read(uint64_t offset) "Read at address: 0x%" PRIx64
+sifive_pwm_write(uint64_t data, uint64_t offset) "Write 0x%" PRIx64 " at address: 0x%" PRIx64
--
2.31.1
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH v3 2/2] sifive_u: Connect the SiFive PWM device
2021-09-09 3:54 [PATCH v3 0/2] Add the SiFive PWM device Alistair Francis
2021-09-09 3:55 ` [PATCH v3 1/2] hw/timer: Add SiFive PWM support Alistair Francis
@ 2021-09-09 3:55 ` Alistair Francis
2021-09-09 4:37 ` Bin Meng
1 sibling, 1 reply; 6+ messages in thread
From: Alistair Francis @ 2021-09-09 3:55 UTC (permalink / raw)
To: qemu-devel, qemu-riscv; +Cc: bmeng.cn, palmer, alistair.francis, alistair23
From: Alistair Francis <alistair.francis@wdc.com>
Connect the SiFive PWM device and expose it via the device tree.
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
---
docs/system/riscv/sifive_u.rst | 1 +
include/hw/riscv/sifive_u.h | 14 ++++++++-
hw/riscv/sifive_u.c | 55 +++++++++++++++++++++++++++++++++-
hw/timer/sifive_pwm.c | 1 +
hw/riscv/Kconfig | 1 +
5 files changed, 70 insertions(+), 2 deletions(-)
diff --git a/docs/system/riscv/sifive_u.rst b/docs/system/riscv/sifive_u.rst
index 01108b5ecc..7c65e9c440 100644
--- a/docs/system/riscv/sifive_u.rst
+++ b/docs/system/riscv/sifive_u.rst
@@ -24,6 +24,7 @@ The ``sifive_u`` machine supports the following devices:
* 2 QSPI controllers
* 1 ISSI 25WP256 flash
* 1 SD card in SPI mode
+* PWM0 and PWM1
Please note the real world HiFive Unleashed board has a fixed configuration of
1 E51 core and 4 U54 core combination and the RISC-V core boots in 64-bit mode.
diff --git a/include/hw/riscv/sifive_u.h b/include/hw/riscv/sifive_u.h
index 2656b39808..f71c90c94c 100644
--- a/include/hw/riscv/sifive_u.h
+++ b/include/hw/riscv/sifive_u.h
@@ -27,6 +27,7 @@
#include "hw/misc/sifive_u_otp.h"
#include "hw/misc/sifive_u_prci.h"
#include "hw/ssi/sifive_spi.h"
+#include "hw/timer/sifive_pwm.h"
#define TYPE_RISCV_U_SOC "riscv.sifive.u.soc"
#define RISCV_U_SOC(obj) \
@@ -49,6 +50,7 @@ typedef struct SiFiveUSoCState {
SiFiveSPIState spi0;
SiFiveSPIState spi2;
CadenceGEMState gem;
+ SiFivePwmState pwm[2];
uint32_t serial;
char *cpu_type;
@@ -92,7 +94,9 @@ enum {
SIFIVE_U_DEV_FLASH0,
SIFIVE_U_DEV_DRAM,
SIFIVE_U_DEV_GEM,
- SIFIVE_U_DEV_GEM_MGMT
+ SIFIVE_U_DEV_GEM_MGMT,
+ SIFIVE_U_DEV_PWM0,
+ SIFIVE_U_DEV_PWM1
};
enum {
@@ -126,6 +130,14 @@ enum {
SIFIVE_U_PDMA_IRQ5 = 28,
SIFIVE_U_PDMA_IRQ6 = 29,
SIFIVE_U_PDMA_IRQ7 = 30,
+ SIFIVE_U_PWM0_IRQ0 = 42,
+ SIFIVE_U_PWM0_IRQ1 = 43,
+ SIFIVE_U_PWM0_IRQ2 = 44,
+ SIFIVE_U_PWM0_IRQ3 = 45,
+ SIFIVE_U_PWM1_IRQ0 = 46,
+ SIFIVE_U_PWM1_IRQ1 = 47,
+ SIFIVE_U_PWM1_IRQ2 = 48,
+ SIFIVE_U_PWM1_IRQ3 = 49,
SIFIVE_U_QSPI0_IRQ = 51,
SIFIVE_U_GEM_IRQ = 53
};
diff --git a/hw/riscv/sifive_u.c b/hw/riscv/sifive_u.c
index 6cc1a62b0f..2301f5dd4f 100644
--- a/hw/riscv/sifive_u.c
+++ b/hw/riscv/sifive_u.c
@@ -17,6 +17,7 @@
* 7) DMA (Direct Memory Access Controller)
* 8) SPI0 connected to an SPI flash
* 9) SPI2 connected to an SD card
+ * 10) PWM0 and PWM1
*
* This board currently generates devicetree dynamically that indicates at least
* two harts and up to five harts.
@@ -75,6 +76,8 @@ static const MemMapEntry sifive_u_memmap[] = {
[SIFIVE_U_DEV_PRCI] = { 0x10000000, 0x1000 },
[SIFIVE_U_DEV_UART0] = { 0x10010000, 0x1000 },
[SIFIVE_U_DEV_UART1] = { 0x10011000, 0x1000 },
+ [SIFIVE_U_DEV_PWM0] = { 0x10020000, 0x1000 },
+ [SIFIVE_U_DEV_PWM1] = { 0x10021000, 0x1000 },
[SIFIVE_U_DEV_QSPI0] = { 0x10040000, 0x1000 },
[SIFIVE_U_DEV_QSPI2] = { 0x10050000, 0x1000 },
[SIFIVE_U_DEV_GPIO] = { 0x10060000, 0x1000 },
@@ -441,6 +444,38 @@ static void create_fdt(SiFiveUState *s, const MemMapEntry *memmap,
qemu_fdt_setprop_cell(fdt, nodename, "reg", 0x0);
g_free(nodename);
+ nodename = g_strdup_printf("/soc/pwm@%lx",
+ (long)memmap[SIFIVE_U_DEV_PWM0].base);
+ qemu_fdt_add_subnode(fdt, nodename);
+ qemu_fdt_setprop_string(fdt, nodename, "compatible", "sifive,pwm0");
+ qemu_fdt_setprop_cells(fdt, nodename, "reg",
+ 0x0, memmap[SIFIVE_U_DEV_PWM0].base,
+ 0x0, memmap[SIFIVE_U_DEV_PWM0].size);
+ qemu_fdt_setprop_cell(fdt, nodename, "interrupt-parent", plic_phandle);
+ qemu_fdt_setprop_cells(fdt, nodename, "interrupts",
+ SIFIVE_U_PWM0_IRQ0, SIFIVE_U_PWM0_IRQ1,
+ SIFIVE_U_PWM0_IRQ2, SIFIVE_U_PWM0_IRQ3);
+ qemu_fdt_setprop_cells(fdt, nodename, "clocks",
+ prci_phandle, PRCI_CLK_TLCLK);
+ qemu_fdt_setprop_cell(fdt, nodename, "#pwm-cells", 0);
+ g_free(nodename);
+
+ nodename = g_strdup_printf("/soc/pwm@%lx",
+ (long)memmap[SIFIVE_U_DEV_PWM1].base);
+ qemu_fdt_add_subnode(fdt, nodename);
+ qemu_fdt_setprop_string(fdt, nodename, "compatible", "sifive,pwm0");
+ qemu_fdt_setprop_cells(fdt, nodename, "reg",
+ 0x0, memmap[SIFIVE_U_DEV_PWM1].base,
+ 0x0, memmap[SIFIVE_U_DEV_PWM1].size);
+ qemu_fdt_setprop_cell(fdt, nodename, "interrupt-parent", plic_phandle);
+ qemu_fdt_setprop_cells(fdt, nodename, "interrupts",
+ SIFIVE_U_PWM1_IRQ0, SIFIVE_U_PWM1_IRQ1,
+ SIFIVE_U_PWM1_IRQ2, SIFIVE_U_PWM1_IRQ3);
+ qemu_fdt_setprop_cells(fdt, nodename, "clocks",
+ prci_phandle, PRCI_CLK_TLCLK);
+ qemu_fdt_setprop_cell(fdt, nodename, "#pwm-cells", 0);
+ g_free(nodename);
+
nodename = g_strdup_printf("/soc/serial@%lx",
(long)memmap[SIFIVE_U_DEV_UART1].base);
qemu_fdt_add_subnode(fdt, nodename);
@@ -765,6 +800,8 @@ static void sifive_u_soc_instance_init(Object *obj)
object_initialize_child(obj, "pdma", &s->dma, TYPE_SIFIVE_PDMA);
object_initialize_child(obj, "spi0", &s->spi0, TYPE_SIFIVE_SPI);
object_initialize_child(obj, "spi2", &s->spi2, TYPE_SIFIVE_SPI);
+ object_initialize_child(obj, "pwm0", &s->pwm[0], TYPE_SIFIVE_PWM);
+ object_initialize_child(obj, "pwm1", &s->pwm[1], TYPE_SIFIVE_PWM);
}
static void sifive_u_soc_realize(DeviceState *dev, Error **errp)
@@ -777,7 +814,7 @@ static void sifive_u_soc_realize(DeviceState *dev, Error **errp)
MemoryRegion *l2lim_mem = g_new(MemoryRegion, 1);
char *plic_hart_config;
size_t plic_hart_config_len;
- int i;
+ int i, j;
NICInfo *nd = &nd_table[0];
qdev_prop_set_uint32(DEVICE(&s->u_cpus), "num-harts", ms->smp.cpus - 1);
@@ -904,6 +941,22 @@ static void sifive_u_soc_realize(DeviceState *dev, Error **errp)
sysbus_connect_irq(SYS_BUS_DEVICE(&s->gem), 0,
qdev_get_gpio_in(DEVICE(s->plic), SIFIVE_U_GEM_IRQ));
+ /* PWM */
+ for (i = 0; i < 2; i++) {
+ if (!sysbus_realize(SYS_BUS_DEVICE(&s->pwm[i]), errp)) {
+ return;
+ }
+ sysbus_mmio_map(SYS_BUS_DEVICE(&s->pwm[i]), 0,
+ memmap[SIFIVE_U_DEV_PWM0].base + (0x1000 * i));
+
+ /* Connect PWM interrupts to the PLIC */
+ for (j = 0; j < SIFIVE_PWM_IRQS; j++) {
+ sysbus_connect_irq(SYS_BUS_DEVICE(&s->pwm[i]), j,
+ qdev_get_gpio_in(DEVICE(s->plic),
+ SIFIVE_U_PWM0_IRQ0 + (i * 4) + j));
+ }
+ }
+
create_unimplemented_device("riscv.sifive.u.gem-mgmt",
memmap[SIFIVE_U_DEV_GEM_MGMT].base, memmap[SIFIVE_U_DEV_GEM_MGMT].size);
diff --git a/hw/timer/sifive_pwm.c b/hw/timer/sifive_pwm.c
index 5565ff812a..c664480ccf 100644
--- a/hw/timer/sifive_pwm.c
+++ b/hw/timer/sifive_pwm.c
@@ -25,6 +25,7 @@
*/
#include "qemu/osdep.h"
+#include "trace.h"
#include "hw/irq.h"
#include "hw/timer/sifive_pwm.h"
#include "hw/qdev-properties.h"
diff --git a/hw/riscv/Kconfig b/hw/riscv/Kconfig
index ff75add6f3..d56c339ef6 100644
--- a/hw/riscv/Kconfig
+++ b/hw/riscv/Kconfig
@@ -69,6 +69,7 @@ config SIFIVE_U
select SIFIVE_UART
select SIFIVE_U_OTP
select SIFIVE_U_PRCI
+ select SIFIVE_PWM
select SSI_M25P80
select SSI_SD
select UNIMP
--
2.31.1
^ permalink raw reply related [flat|nested] 6+ messages in thread