diff options
Diffstat (limited to 'hw/misc/stm32l4x5_rcc.c')
| -rw-r--r-- | hw/misc/stm32l4x5_rcc.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/hw/misc/stm32l4x5_rcc.c b/hw/misc/stm32l4x5_rcc.c index 269e50b85a..ace4083e83 100644 --- a/hw/misc/stm32l4x5_rcc.c +++ b/hw/misc/stm32l4x5_rcc.c @@ -36,6 +36,134 @@ #define LSE_FRQ 32768ULL #define LSI_FRQ 32000ULL +static void clock_mux_update(RccClockMuxState *mux) +{ + uint64_t src_freq; + Clock *current_source = mux->srcs[mux->src]; + uint32_t freq_multiplier = 0; + /* + * To avoid rounding errors, we use the clock period instead of the + * frequency. + * This means that the multiplier of the mux becomes the divider of + * the clock and the divider of the mux becomes the multiplier of the + * clock. + */ + if (mux->enabled && mux->divider) { + freq_multiplier = mux->divider; + } + + clock_set_mul_div(mux->out, freq_multiplier, mux->multiplier); + clock_update(mux->out, clock_get(current_source)); + + src_freq = clock_get_hz(current_source); + /* TODO: can we simply detect if the config changed so that we reduce log spam ? */ + trace_stm32l4x5_rcc_mux_update(mux->id, mux->src, src_freq, + mux->multiplier, mux->divider); +} + +static void clock_mux_src_update(void *opaque, ClockEvent event) +{ + RccClockMuxState **backref = opaque; + RccClockMuxState *s = *backref; + /* + * The backref value is equal to: + * s->backref + (sizeof(RccClockMuxState *) * update_src). + * By subtracting we can get back the index of the updated clock. + */ + const uint32_t update_src = backref - s->backref; + /* Only update if the clock that was updated is the current source */ + if (update_src == s->src) { + clock_mux_update(s); + } +} + +static void clock_mux_init(Object *obj) +{ + RccClockMuxState *s = RCC_CLOCK_MUX(obj); + size_t i; + + for (i = 0; i < RCC_NUM_CLOCK_MUX_SRC; i++) { + char *name = g_strdup_printf("srcs[%zu]", i); + s->backref[i] = s; + s->srcs[i] = qdev_init_clock_in(DEVICE(s), name, + clock_mux_src_update, + &s->backref[i], + ClockUpdate); + g_free(name); + } + + s->out = qdev_init_clock_out(DEVICE(s), "out"); +} + +static void clock_mux_reset_hold(Object *obj) +{ } + +static const VMStateDescription clock_mux_vmstate = { + .name = TYPE_RCC_CLOCK_MUX, + .version_id = 1, + .minimum_version_id = 1, + .fields = (VMStateField[]) { + VMSTATE_UINT32(id, RccClockMuxState), + VMSTATE_ARRAY_CLOCK(srcs, RccClockMuxState, + RCC_NUM_CLOCK_MUX_SRC), + VMSTATE_BOOL(enabled, RccClockMuxState), + VMSTATE_UINT32(src, RccClockMuxState), + VMSTATE_UINT32(multiplier, RccClockMuxState), + VMSTATE_UINT32(divider, RccClockMuxState), + VMSTATE_END_OF_LIST() + } +}; + +static void clock_mux_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + ResettableClass *rc = RESETTABLE_CLASS(klass); + + rc->phases.hold = clock_mux_reset_hold; + dc->vmsd = &clock_mux_vmstate; +} + +static void clock_mux_set_enable(RccClockMuxState *mux, bool enabled) +{ + if (mux->enabled == enabled) { + return; + } + + if (enabled) { + trace_stm32l4x5_rcc_mux_enable(mux->id); + } else { + trace_stm32l4x5_rcc_mux_disable(mux->id); + } + + mux->enabled = enabled; + clock_mux_update(mux); +} + +static void clock_mux_set_factor(RccClockMuxState *mux, + uint32_t multiplier, uint32_t divider) +{ + if (mux->multiplier == multiplier && mux->divider == divider) { + return; + } + trace_stm32l4x5_rcc_mux_set_factor(mux->id, + mux->multiplier, multiplier, mux->divider, divider); + + mux->multiplier = multiplier; + mux->divider = divider; + clock_mux_update(mux); +} + +static void clock_mux_set_source(RccClockMuxState *mux, RccClockMuxSource src) +{ + if (mux->src == src) { + return; + } + + trace_stm32l4x5_rcc_mux_set_src(mux->id, mux->src, src); + mux->src = src; + clock_mux_update(mux); +} + static void rcc_update_irq(Stm32l4x5RccState *s) { if (s->cifr & CIFR_IRQ_MASK) { @@ -335,6 +463,7 @@ static const ClockPortInitArray stm32l4x5_rcc_clocks = { static void stm32l4x5_rcc_init(Object *obj) { Stm32l4x5RccState *s = STM32L4X5_RCC(obj); + size_t i; sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->irq); @@ -344,6 +473,14 @@ static void stm32l4x5_rcc_init(Object *obj) qdev_init_clocks(DEVICE(s), stm32l4x5_rcc_clocks); + for (i = 0; i < RCC_NUM_CLOCK_MUX; i++) { + + object_initialize_child(obj, "clock[*]", + &s->clock_muxes[i], + TYPE_RCC_CLOCK_MUX); + + } + s->gnd = clock_new(obj, "gnd"); } @@ -396,6 +533,7 @@ static const VMStateDescription vmstate_stm32l4x5_rcc = { static void stm32l4x5_rcc_realize(DeviceState *dev, Error **errp) { Stm32l4x5RccState *s = STM32L4X5_RCC(dev); + size_t i; if (s->hse_frequency < 4000000ULL || s->hse_frequency > 48000000ULL) { @@ -405,10 +543,26 @@ static void stm32l4x5_rcc_realize(DeviceState *dev, Error **errp) return; } + for (i = 0; i < RCC_NUM_CLOCK_MUX; i++) { + RccClockMuxState *clock_mux = &s->clock_muxes[i]; + + if (!qdev_realize(DEVICE(clock_mux), NULL, errp)) { + return; + } + } + clock_update_hz(s->msi_rc, MSI_DEFAULT_FRQ); clock_update_hz(s->sai1_extclk, s->sai1_extclk_frequency); clock_update_hz(s->sai2_extclk, s->sai2_extclk_frequency); clock_update(s->gnd, 0); + + /* + * Dummy values to make compilation pass. + * Removed in later commits. + */ + clock_mux_set_source(&s->clock_muxes[0], RCC_CLOCK_MUX_SRC_GND); + clock_mux_set_enable(&s->clock_muxes[0], true); + clock_mux_set_factor(&s->clock_muxes[0], 1, 1); } static Property stm32l4x5_rcc_properties[] = { @@ -440,6 +594,12 @@ static const TypeInfo stm32l4x5_rcc_types[] = { .instance_size = sizeof(Stm32l4x5RccState), .instance_init = stm32l4x5_rcc_init, .class_init = stm32l4x5_rcc_class_init, + }, { + .name = TYPE_RCC_CLOCK_MUX, + .parent = TYPE_DEVICE, + .instance_size = sizeof(RccClockMuxState), + .instance_init = clock_mux_init, + .class_init = clock_mux_class_init, } }; 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