This object represents the PLLs and their channels. The PLLs allow for a
more fine-grained control of the clocks frequency.
Wasn't sure about how to handle the reset and the migration so used the
same appproach as the BCM2835 CPRMAN.
Signed-off-by: Arnaud Minier <arnaud.min...@telecom-paris.fr>
Signed-off-by: Inès Varhol <ines.var...@telecom-paris.fr>
---
hw/misc/stm32l4x5_rcc.c | 175 ++++++++++++++++++++++
hw/misc/trace-events | 5 +
include/hw/misc/stm32l4x5_rcc.h | 40 +++++
include/hw/misc/stm32l4x5_rcc_internals.h | 22 +++
4 files changed, 242 insertions(+)
diff --git a/hw/misc/stm32l4x5_rcc.c b/hw/misc/stm32l4x5_rcc.c
index ed10832f88..fb0233c3e9 100644
--- a/hw/misc/stm32l4x5_rcc.c
+++ b/hw/misc/stm32l4x5_rcc.c
@@ -162,6 +162,156 @@ static void clock_mux_set_source(RccClockMuxState *mux,
RccClockMuxSource src)
clock_mux_update(mux);
}
+static void pll_update(RccPllState *pll)
+{
+ uint64_t vco_freq, old_channel_freq, channel_freq;
+ int i;
+
+ /* The common PLLM factor is handled by the PLL mux */
+ vco_freq = muldiv64(clock_get_hz(pll->in), pll->vco_multiplier, 1);
+
+ for (i = 0; i < RCC_NUM_CHANNEL_PLL_OUT; i++) {
+ if (!pll->channel_exists[i]) {
+ continue;
+ }
+
+ old_channel_freq = clock_get_hz(pll->channels[i]);
+ if (!pll->enabled ||
+ !pll->channel_enabled[i] ||
+ !pll->channel_divider[i]) {
+ channel_freq = 0;
+ } else {
+ channel_freq = muldiv64(vco_freq,
+ 1,
+ pll->channel_divider[i]);
+ }
+
+ /* No change, early continue to avoid log spam and useless propagation
*/
+ if (old_channel_freq == channel_freq) {
+ continue;
+ }
+
+ clock_update_hz(pll->channels[i], channel_freq);
+ trace_stm32l4x5_rcc_pll_update(pll->id, i, vco_freq,
+ old_channel_freq, channel_freq);
+ }
+}
+
+static void pll_src_update(void *opaque, ClockEvent event)
+{
+ RccPllState *s = opaque;
+ pll_update(s);
+}
+
+static void pll_init(Object *obj)
+{
+ RccPllState *s = RCC_PLL(obj);
+ size_t i;
+
+ s->in = qdev_init_clock_in(DEVICE(s), "in",
+ pll_src_update, s, ClockUpdate);
+
+ const char *names[] = {
+ "out-p", "out-q", "out-r",
+ };
+
+ for (i = 0; i < RCC_NUM_CHANNEL_PLL_OUT; i++) {
+ s->channels[i] = qdev_init_clock_out(DEVICE(s), names[i]);
+ }
+}
+
+static void pll_reset_hold(Object *obj)
+{ }
+
+static const VMStateDescription pll_vmstate = {
+ .name = TYPE_RCC_PLL,
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT32(id, RccPllState),
+ VMSTATE_CLOCK(in, RccPllState),
+ VMSTATE_ARRAY_CLOCK(channels, RccPllState,
+ RCC_NUM_CHANNEL_PLL_OUT),
+ VMSTATE_BOOL(enabled, RccPllState),
+ VMSTATE_UINT32(vco_multiplier, RccPllState),
+ VMSTATE_BOOL_ARRAY(channel_enabled, RccPllState,
RCC_NUM_CHANNEL_PLL_OUT),
+ VMSTATE_BOOL_ARRAY(channel_exists, RccPllState,
RCC_NUM_CHANNEL_PLL_OUT),
+ VMSTATE_UINT32_ARRAY(channel_divider, RccPllState,
RCC_NUM_CHANNEL_PLL_OUT),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+static void pll_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ ResettableClass *rc = RESETTABLE_CLASS(klass);
+
+ rc->phases.hold = pll_reset_hold;
+ dc->vmsd = &pll_vmstate;
+}
+
+static void pll_set_vco_multiplier(RccPllState *pll, uint32_t vco_multiplier)
+{
+ if (pll->vco_multiplier == vco_multiplier) {
+ return;
+ }
+
+ if (vco_multiplier < 8 || vco_multiplier > 86) {
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "%s: VCO multiplier is out of bound (%u) for PLL %u\n",
+ __func__, vco_multiplier, pll->id);
+ }
+
+ trace_stm32l4x5_rcc_pll_set_vco_multiplier(pll->id,
+ pll->vco_multiplier, vco_multiplier);
+
+ pll->vco_multiplier = vco_multiplier;
+ pll_update(pll);
+}
+
+static void pll_set_enable(RccPllState *pll, bool enabled)
+{
+ if (pll->enabled == enabled) {
+ return;
+ }
+
+ pll->enabled = enabled;
+ pll_update(pll);
+}
+
+static void pll_set_channel_enable(RccPllState *pll,
+ PllCommonChannels channel,
+ bool enabled)
+{
+ if (pll->channel_enabled[channel] == enabled) {
+ return;
+ }
+
+ if (enabled) {
+ trace_stm32l4x5_rcc_pll_channel_enable(pll->id, channel);
+ } else {
+ trace_stm32l4x5_rcc_pll_channel_disable(pll->id, channel);
+ }
+
+ pll->channel_enabled[channel] = enabled;
+ pll_update(pll);
+}
+
+static void pll_set_channel_divider(RccPllState *pll,
+ PllCommonChannels channel,
+ uint32_t divider)
+{
+ if (pll->channel_divider[channel] == divider) {
+ return;
+ }
+
+ trace_stm32l4x5_rcc_pll_set_channel_divider(pll->id,
+ channel, pll->channel_divider[channel], divider);
+
+ pll->channel_divider[channel] = divider;
+ pll_update(pll);
+}
+
static void rcc_update_irq(Stm32l4x5RccState *s)
{
if (s->cifr & CIFR_IRQ_MASK) {
@@ -465,6 +615,11 @@ static void stm32l4x5_rcc_init(Object *obj)
qdev_init_clocks(DEVICE(s), stm32l4x5_rcc_clocks);
+ for (i = 0; i < RCC_NUM_PLL; i++) {
+ object_initialize_child(obj, "pll[*]",
+ &s->plls[i], TYPE_RCC_PLL);
+ }
+
for (i = 0; i < RCC_NUM_CLOCK_MUX; i++) {
object_initialize_child(obj, "clock[*]",
@@ -528,6 +683,16 @@ static void stm32l4x5_rcc_realize(DeviceState *dev, Error
**errp)
return;
}
+ for (i = 0; i < RCC_NUM_PLL; i++) {
+ RccPllState *pll = &s->plls[i];
+
+ clock_set_source(pll->in, s->clock_muxes[RCC_CLOCK_MUX_PLL_INPUT].out);
+
+ if (!qdev_realize(DEVICE(pll), NULL, errp)) {
+ return;
+ }
+ }
+
for (i = 0; i < RCC_NUM_CLOCK_MUX; i++) {
RccClockMuxState *clock_mux = &s->clock_muxes[i];
@@ -548,6 +713,10 @@ static void stm32l4x5_rcc_realize(DeviceState *dev, Error
**errp)
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);
+ pll_set_channel_divider(&s->plls[0], 0, 1);
+ pll_set_enable(&s->plls[0], true);
+ pll_set_channel_enable(&s->plls[0], 0, true);
+ pll_set_vco_multiplier(&s->plls[0], 1);
}
static Property stm32l4x5_rcc_properties[] = {
@@ -585,6 +754,12 @@ static const TypeInfo stm32l4x5_rcc_types[] = {
.instance_size = sizeof(RccClockMuxState),
.instance_init = clock_mux_init,
.class_init = clock_mux_class_init,
+ }, {
+ .name = TYPE_RCC_PLL,
+ .parent = TYPE_DEVICE,
+ .instance_size = sizeof(RccPllState),
+ .instance_init = pll_init,
+ .class_init = pll_class_init,
}
};
diff --git a/hw/misc/trace-events b/hw/misc/trace-events
index d5e471811c..1b6054d88a 100644
--- a/hw/misc/trace-events
+++ b/hw/misc/trace-events
@@ -182,6 +182,11 @@ stm32l4x5_rcc_mux_disable(uint32_t mux_id) "RCC: Mux %d
disabled"
stm32l4x5_rcc_mux_set_factor(uint32_t mux_id, uint32_t old_multiplier,
uint32_t new_multiplier, uint32_t old_divider, uint32_t new_divider) "RCC: Mux
%d factor changed: multiplier (%u -> %u), divider (%u -> %u)"
stm32l4x5_rcc_mux_set_src(uint32_t mux_id, uint32_t old_src, uint32_t new_src)
"RCC: Mux %d source changed: from %u to %u"
stm32l4x5_rcc_mux_update(uint32_t mux_id, uint32_t src, uint64_t src_freq,
uint64_t new_freq) "RCC: Mux %d src %d update: src_freq %" PRIu64 " new_freq %"
PRIu64 ""
+stm32l4x5_rcc_pll_set_vco_multiplier(uint32_t pll_id, uint32_t old_multiplier,
uint32_t new_multiplier) "RCC: PLL %u: vco_multiplier changed (%u -> %u)"
+stm32l4x5_rcc_pll_channel_enable(uint32_t pll_id, uint32_t channel_id) "RCC:
PLL %u, channel %u enabled"
+stm32l4x5_rcc_pll_channel_disable(uint32_t pll_id, uint32_t channel_id) "RCC:
PLL %u, channel %u disabled"
+stm32l4x5_rcc_pll_set_channel_divider(uint32_t pll_id, uint32_t channel_id,
uint32_t old_divider, uint32_t new_divider) "RCC: PLL %u, channel %u: divider
changed (%u -> %u)"
+stm32l4x5_rcc_pll_update(uint32_t pll_id, uint32_t channel_id, uint64_t
vco_freq, uint64_t old_freq, uint64_t new_freq) "RCC: PLL %d channel %d update:
vco_freq %" PRIu64 " old_freq %" PRIu64 " new_freq %" PRIu64 ""
# tz-mpc.c
tz_mpc_reg_read(uint32_t offset, uint64_t data, unsigned size) "TZ MPC regs
read: offset 0x%x data 0x%" PRIx64 " size %u"
diff --git a/include/hw/misc/stm32l4x5_rcc.h b/include/hw/misc/stm32l4x5_rcc.h
index 6719be9fbe..0fbfba5c40 100644
--- a/include/hw/misc/stm32l4x5_rcc.h
+++ b/include/hw/misc/stm32l4x5_rcc.h
@@ -26,6 +26,15 @@ OBJECT_DECLARE_SIMPLE_TYPE(Stm32l4x5RccState, STM32L4X5_RCC)
/* In the Stm32l4x5 clock tree, mux have at most 7 sources */
#define RCC_NUM_CLOCK_MUX_SRC 7
+
+typedef enum PllCommonChannels {
+ RCC_PLL_COMMON_CHANNEL_P = 0,
+ RCC_PLL_COMMON_CHANNEL_Q = 1,
+ RCC_PLL_COMMON_CHANNEL_R = 2,
+
+ RCC_NUM_CHANNEL_PLL_OUT = 3
+} PllCommonChannels;
+
/* NB: Prescaler are assimilated to mux with one source and one output */
typedef enum RccClockMux {
/* Internal muxes that arent't exposed publicly to other peripherals */
@@ -124,6 +133,14 @@ typedef enum RccClockMux {
RCC_NUM_CLOCK_MUX
} RccClockMux;
+typedef enum RccPll {
+ RCC_PLL_PLL,
+ RCC_PLL_PLLSAI1,
+ RCC_PLL_PLLSAI2,
+
+ RCC_NUM_PLL
+} RccPll;
+
typedef struct RccClockMuxState {
DeviceState parent_obj;
@@ -142,6 +159,26 @@ typedef struct RccClockMuxState {
struct RccClockMuxState *backref[RCC_NUM_CLOCK_MUX_SRC];
} RccClockMuxState;
+typedef struct RccPllState {
+ DeviceState parent_obj;
+
+ RccPll id;
+ Clock *in;
+ uint32_t vco_multiplier;
+ Clock *channels[RCC_NUM_CHANNEL_PLL_OUT];
+ /* Global pll enabled flag */
+ bool enabled;
+ /* 'enabled' refers to the runtime configuration */
+ bool channel_enabled[RCC_NUM_CHANNEL_PLL_OUT];
+ /*
+ * 'exists' refers to the physical configuration
+ * It should only be set at pll initialization.
+ * e.g. pllsai2 doesn't have a Q output.
+ */
+ bool channel_exists[RCC_NUM_CHANNEL_PLL_OUT];
+ uint32_t channel_divider[RCC_NUM_CHANNEL_PLL_OUT];
+} RccPllState;
+
struct Stm32l4x5RccState {
SysBusDevice parent_obj;
@@ -187,6 +224,9 @@ struct Stm32l4x5RccState {
Clock *sai1_extclk;
Clock *sai2_extclk;
+ /* PLLs */
+ RccPllState plls[RCC_NUM_PLL];
+
/* Muxes ~= outputs */
RccClockMuxState clock_muxes[RCC_NUM_CLOCK_MUX];
diff --git a/include/hw/misc/stm32l4x5_rcc_internals.h
b/include/hw/misc/stm32l4x5_rcc_internals.h
index 4aa836848b..a9da5e3be7 100644
--- a/include/hw/misc/stm32l4x5_rcc_internals.h
+++ b/include/hw/misc/stm32l4x5_rcc_internals.h
@@ -22,7 +22,10 @@
#include "hw/misc/stm32l4x5_rcc.h"
#define TYPE_RCC_CLOCK_MUX "stm32l4x5-rcc-clock-mux"
+#define TYPE_RCC_PLL "stm32l4x5-rcc-pll"
+
OBJECT_DECLARE_SIMPLE_TYPE(RccClockMuxState, RCC_CLOCK_MUX)
+OBJECT_DECLARE_SIMPLE_TYPE(RccPllState, RCC_PLL)
/* Register map */
REG32(CR, 0x00)
@@ -285,6 +288,25 @@ REG32(CSR, 0x94)
R_CSR_FWRSTF_MASK | \
R_CSR_LSIRDY_MASK)
+/* Pll Channels */
+enum PllChannels {
+ RCC_PLL_CHANNEL_PLLSAI3CLK = 0,
+ RCC_PLL_CHANNEL_PLL48M1CLK = 1,
+ RCC_PLL_CHANNEL_PLLCLK = 2,
+};
+
+enum PllSai1Channels {
+ RCC_PLLSAI1_CHANNEL_PLLSAI1CLK = 0,
+ RCC_PLLSAI1_CHANNEL_PLL48M2CLK = 1,
+ RCC_PLLSAI1_CHANNEL_PLLADC1CLK = 2,
+};
+
+enum PllSai2Channels {
+ RCC_PLLSAI2_CHANNEL_PLLSAI2CLK = 0,
+ /* No Q channel */
+ RCC_PLLSAI2_CHANNEL_PLLADC2CLK = 2,
+};
+
typedef enum RccClockMuxSource {
RCC_CLOCK_MUX_SRC_GND = 0,
RCC_CLOCK_MUX_SRC_HSI,
--
2.34.1
