[nrf fromlist] drivers: clock_control: nrf2: add support for global hfsll clock

Add device driver support for global hsfll clock.

Upstream PR #: 81735

Signed-off-by: Bjarki Arge Andreasen <[email protected]>

Author: bjarki-andreasen

drivers/clock_control/CMakeLists.txt

@@ -35,6 +35,7 @@ zephyr_library_sources_ifdef(CONFIG_CLOCK_CONTROL_RENESAS_RA_CGC      clock_cont
 zephyr_library_sources_ifdef(CONFIG_CLOCK_CONTROL_AMBIQ               clock_control_ambiq.c)
 zephyr_library_sources_ifdef(CONFIG_CLOCK_CONTROL_PWM                 clock_control_pwm.c)
 zephyr_library_sources_ifdef(CONFIG_CLOCK_CONTROL_RPI_PICO            clock_control_rpi_pico.c)
+zephyr_library_sources_ifdef(CONFIG_CLOCK_CONTROL_NRF2_GLOBAL_HSFLL   clock_control_nrf2_global_hsfll.c)
 
 if(CONFIG_CLOCK_CONTROL_NRF2)
   zephyr_library_sources(clock_control_nrf2_common.c)

drivers/clock_control/Kconfig.nrf

@@ -193,4 +193,37 @@ config CLOCK_CONTROL_NRF2_NRFS_CLOCK_TIMEOUT_MS
 	int "Timeout waiting for nrfs clock service callback in milliseconds"
 	default 1000
 
+config CLOCK_CONTROL_NRF2_GLOBAL_HSFLL
+	bool "Clock control for global HSFLL"
+	depends on NRFS_GDFS_SERVICE_ENABLED
+	default y
+
+if CLOCK_CONTROL_NRF2_GLOBAL_HSFLL
+
+config CLOCK_CONTROL_NRF2_GLOBAL_HSFLL_TIMEOUT_MS
+	int "Frequency request timeout in milliseconds"
+	default 10000
+
+config CLOCK_CONTROL_NRF2_GLOBAL_HSFLL_REQ_LOW_FREQ
+	bool "Request LOW frequency on init"
+	default y
+	help
+	  The GDFS service will default to HIGH frequency until it receives
+	  a lower frequency request. The NRF2 clock controller drivers
+	  expect the clock to be initialized to their lowest frequency, so
+	  we need to send a request on init to align GDFS with the NRF2
+	  clock controller driver.
+
+	  This initial request can be disabled to prevent a potentially
+	  unnecessary HIGH -> LOW -> HIGH cycle given some module will
+	  request a HIGH frequency on init anyway.
+
+config CLOCK_CONTROL_NRF2_GLOBAL_HSFLL_INIT_PRIORITY
+	int "Init priority of global HSFLL device driver"
+	default 52
+	help
+	  Must be higher than NRFS backend
+
+endif # CLOCK_CONTROL_NRF2_GLOBAL_HSFLL
+
 endif # CLOCK_CONTROL_NRF2

drivers/clock_control/clock_control_nrf2_global_hsfll.c

@@ -0,0 +1,302 @@
+/*
+ * Copyright (c) 2024 Nordic Semiconductor ASA
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#define DT_DRV_COMPAT nordic_nrf_hsfll_global
+
+#include "clock_control_nrf2_common.h"
+#include <zephyr/devicetree.h>
+#include <zephyr/drivers/clock_control/nrf_clock_control.h>
+#include <nrfs_gdfs.h>
+
+#include <zephyr/logging/log.h>
+LOG_MODULE_DECLARE(clock_control_nrf2, CONFIG_CLOCK_CONTROL_LOG_LEVEL);
+
+#define GLOBAL_HSFLL_CLOCK_FREQUENCIES \
+	DT_INST_PROP(0, supported_clock_frequencies)
+
+#define GLOBAL_HSFLL_CLOCK_FREQUENCIES_IDX(idx) \
+	DT_INST_PROP_BY_IDX(0, supported_clock_frequencies, idx)
+
+#define GLOBAL_HSFLL_CLOCK_FREQUENCIES_SIZE \
+	DT_INST_PROP_LEN(0, supported_clock_frequencies)
+
+#define GLOBAL_HSFLL_FREQ_REQ_TIMEOUT \
+	K_MSEC(CONFIG_CLOCK_CONTROL_NRF2_GLOBAL_HSFLL_TIMEOUT_MS)
+
+#define GLOBAL_HSFLL_INIT_LOW_REQ \
+	CONFIG_CLOCK_CONTROL_NRF2_GLOBAL_HSFLL_REQ_LOW_FREQ
+
+BUILD_ASSERT(GLOBAL_HSFLL_CLOCK_FREQUENCIES_SIZE == 4);
+BUILD_ASSERT(GLOBAL_HSFLL_CLOCK_FREQUENCIES_IDX(0) == 64000000);
+BUILD_ASSERT(GLOBAL_HSFLL_CLOCK_FREQUENCIES_IDX(1) == 128000000);
+BUILD_ASSERT(GLOBAL_HSFLL_CLOCK_FREQUENCIES_IDX(2) == 256000000);
+BUILD_ASSERT(GLOBAL_HSFLL_CLOCK_FREQUENCIES_IDX(3) == 320000000);
+BUILD_ASSERT(GDFS_FREQ_COUNT == 4);
+BUILD_ASSERT(GDFS_FREQ_HIGH == 0);
+BUILD_ASSERT(GDFS_FREQ_MEDHIGH == 1);
+BUILD_ASSERT(GDFS_FREQ_MEDLOW == 2);
+BUILD_ASSERT(GDFS_FREQ_LOW == 3);
+
+struct global_hsfll_dev_config {
+	uint32_t clock_frequencies[GLOBAL_HSFLL_CLOCK_FREQUENCIES_SIZE];
+};
+
+struct global_hsfll_dev_data {
+	STRUCT_CLOCK_CONFIG(global_hsfll, GLOBAL_HSFLL_CLOCK_FREQUENCIES_SIZE) clk_cfg;
+	const struct device *dev;
+	struct k_work evt_work;
+	nrfs_gdfs_evt_type_t evt;
+	struct k_work_delayable timeout_dwork;
+
+#if GLOBAL_HSFLL_INIT_LOW_REQ
+	struct k_sem evt_sem;
+#endif /* GLOBAL_HSFLL_INIT_LOW_REQ */
+};
+
+static uint32_t global_hsfll_get_max_clock_frequency(const struct device *dev)
+{
+	const struct global_hsfll_dev_config *dev_config = dev->config;
+
+	return dev_config->clock_frequencies[ARRAY_SIZE(dev_config->clock_frequencies) - 1];
+}
+
+static struct onoff_manager *global_hsfll_find_mgr(const struct device *dev,
+						   const struct nrf_clock_spec *spec)
+{
+	struct global_hsfll_dev_data *dev_data = dev->data;
+	const struct global_hsfll_dev_config *dev_config = dev->config;
+	uint32_t frequency;
+
+	if (!spec) {
+		return &dev_data->clk_cfg.onoff[0].mgr;
+	}
+
+	if (spec->accuracy || spec->precision) {
+		LOG_ERR("invalid specification of accuracy or precision");
+		return NULL;
+	}
+
+	frequency = spec->frequency == NRF_CLOCK_CONTROL_FREQUENCY_MAX
+		  ? global_hsfll_get_max_clock_frequency(dev)
+		  : spec->frequency;
+
+	for (uint8_t i = 0; i < ARRAY_SIZE(dev_config->clock_frequencies); i++) {
+		if (dev_config->clock_frequencies[i] < frequency) {
+			continue;
+		}
+
+		return &dev_data->clk_cfg.onoff[i].mgr;
+	}
+
+	LOG_ERR("invalid frequency");
+	return NULL;
+}
+
+static int api_request_global_hsfll(const struct device *dev,
+				    const struct nrf_clock_spec *spec,
+				    struct onoff_client *cli)
+{
+	struct onoff_manager *mgr = global_hsfll_find_mgr(dev, spec);
+
+	if (mgr) {
+		return onoff_request(mgr, cli);
+	}
+
+	return -EINVAL;
+}
+
+static int api_release_global_hsfll(const struct device *dev,
+				    const struct nrf_clock_spec *spec)
+{
+	struct onoff_manager *mgr = global_hsfll_find_mgr(dev, spec);
+
+	if (mgr) {
+		return onoff_release(mgr);
+	}
+
+	return -EINVAL;
+}
+
+static int api_cancel_or_release_global_hsfll(const struct device *dev,
+					      const struct nrf_clock_spec *spec,
+					      struct onoff_client *cli)
+{
+	struct onoff_manager *mgr = global_hsfll_find_mgr(dev, spec);
+
+	if (mgr) {
+		return onoff_cancel_or_release(mgr, cli);
+	}
+
+	return -EINVAL;
+}
+
+static struct nrf_clock_control_driver_api driver_api = {
+	.std_api = {
+		.on = api_nosys_on_off,
+		.off = api_nosys_on_off,
+	},
+	.request = api_request_global_hsfll,
+	.release = api_release_global_hsfll,
+	.cancel_or_release = api_cancel_or_release_global_hsfll,
+};
+
+static enum gdfs_frequency_setting global_hsfll_freq_idx_to_nrfs_freq(const struct device *dev,
+								      uint8_t freq_idx)
+{
+	const struct global_hsfll_dev_config *dev_config = dev->config;
+
+	return ARRAY_SIZE(dev_config->clock_frequencies) - 1 - freq_idx;
+}
+
+static const char *global_hsfll_gdfs_freq_to_str(enum gdfs_frequency_setting freq)
+{
+	switch (freq) {
+	case GDFS_FREQ_HIGH:
+		return "GDFS_FREQ_HIGH";
+	case GDFS_FREQ_MEDHIGH:
+		return "GDFS_FREQ_MEDHIGH";
+	case GDFS_FREQ_MEDLOW:
+		return "GDFS_FREQ_MEDLOW";
+	case GDFS_FREQ_LOW:
+		return "GDFS_FREQ_LOW";
+	default:
+		break;
+	}
+
+	return "UNKNOWN";
+}
+
+static void global_hsfll_work_handler(struct k_work *work)
+{
+	struct global_hsfll_dev_data *dev_data =
+		CONTAINER_OF(work, struct global_hsfll_dev_data, clk_cfg.work);
+	const struct device *dev = dev_data->dev;
+	uint8_t freq_idx;
+	enum gdfs_frequency_setting target_freq;
+	nrfs_err_t err;
+
+	freq_idx = clock_config_update_begin(work);
+	target_freq = global_hsfll_freq_idx_to_nrfs_freq(dev, freq_idx);
+
+	LOG_DBG("requesting %s", global_hsfll_gdfs_freq_to_str(target_freq));
+	err = nrfs_gdfs_request_freq(target_freq, dev_data);
+	if (err != NRFS_SUCCESS) {
+		clock_config_update_end(&dev_data->clk_cfg, -EIO);
+		return;
+	}
+
+	k_work_schedule(&dev_data->timeout_dwork, GLOBAL_HSFLL_FREQ_REQ_TIMEOUT);
+}
+
+static void global_hsfll_evt_handler(struct k_work *work)
+{
+	struct global_hsfll_dev_data *dev_data =
+		CONTAINER_OF(work, struct global_hsfll_dev_data, evt_work);
+	int rc;
+
+	k_work_cancel_delayable(&dev_data->timeout_dwork);
+	rc = dev_data->evt == NRFS_GDFS_EVT_FREQ_CONFIRMED ? 0 : -EIO;
+	clock_config_update_end(&dev_data->clk_cfg, rc);
+}
+
+#if GLOBAL_HSFLL_INIT_LOW_REQ
+static void global_hfsll_nrfs_gdfs_init_evt_handler(nrfs_gdfs_evt_t const *p_evt, void *context)
+{
+	struct global_hsfll_dev_data *dev_data = context;
+
+	dev_data->evt = p_evt->type;
+	k_sem_give(&dev_data->evt_sem);
+}
+#endif /* GLOBAL_HSFLL_INIT_LOW_REQ */
+
+static void global_hfsll_nrfs_gdfs_evt_handler(nrfs_gdfs_evt_t const *p_evt, void *context)
+{
+	struct global_hsfll_dev_data *dev_data = context;
+
+	if (k_work_is_pending(&dev_data->evt_work)) {
+		return;
+	}
+
+	dev_data->evt = p_evt->type;
+	k_work_submit(&dev_data->evt_work);
+}
+
+static void global_hsfll_timeout_handler(struct k_work *work)
+{
+	struct k_work_delayable *dwork = k_work_delayable_from_work(work);
+	struct global_hsfll_dev_data *dev_data =
+		CONTAINER_OF(dwork, struct global_hsfll_dev_data, timeout_dwork);
+
+	clock_config_update_end(&dev_data->clk_cfg, -ETIMEDOUT);
+}
+
+static int global_hfsll_init(const struct device *dev)
+{
+	struct global_hsfll_dev_data *dev_data = dev->data;
+	nrfs_err_t err;
+	int rc;
+
+	k_work_init_delayable(&dev_data->timeout_dwork, global_hsfll_timeout_handler);
+	k_work_init(&dev_data->evt_work, global_hsfll_evt_handler);
+
+#if GLOBAL_HSFLL_INIT_LOW_REQ
+	k_sem_init(&dev_data->evt_sem, 0, 1);
+
+	err = nrfs_gdfs_init(global_hfsll_nrfs_gdfs_init_evt_handler);
+	if (err != NRFS_SUCCESS) {
+		return -EIO;
+	}
+
+	LOG_DBG("initial request %s", global_hsfll_gdfs_freq_to_str(GDFS_FREQ_LOW));
+	err = nrfs_gdfs_request_freq(GDFS_FREQ_LOW, dev_data);
+	if (err != NRFS_SUCCESS) {
+		return -EIO;
+	}
+
+	rc = k_sem_take(&dev_data->evt_sem, GLOBAL_HSFLL_FREQ_REQ_TIMEOUT);
+	if (rc) {
+		return -EIO;
+	}
+
+	if (dev_data->evt != NRFS_GDFS_EVT_FREQ_CONFIRMED) {
+		return -EIO;
+	}
+
+	nrfs_gdfs_uninit();
+#endif /* GLOBAL_HSFLL_INIT_LOW_REQ */
+
+	rc = clock_config_init(&dev_data->clk_cfg,
+			       ARRAY_SIZE(dev_data->clk_cfg.onoff),
+			       global_hsfll_work_handler);
+	if (rc < 0) {
+		return rc;
+	}
+
+	err = nrfs_gdfs_init(global_hfsll_nrfs_gdfs_evt_handler);
+	if (err != NRFS_SUCCESS) {
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static struct global_hsfll_dev_data driver_data = {
+	.dev = DEVICE_DT_INST_GET(0),
+};
+
+static const struct global_hsfll_dev_config driver_config = {
+	GLOBAL_HSFLL_CLOCK_FREQUENCIES
+};
+
+DEVICE_DT_INST_DEFINE(
+	0,
+	global_hfsll_init,
+	NULL,
+	&driver_data,
+	&driver_config,
+	POST_KERNEL,
+	CONFIG_CLOCK_CONTROL_NRF2_GLOBAL_HSFLL_INIT_PRIORITY,
+	&driver_api
+);

drivers/clock_control/clock_control_nrf2_hsfll.c

@@ -8,7 +8,6 @@
 #include "clock_control_nrf2_common.h"
 #include <zephyr/devicetree.h>
 #include <zephyr/drivers/clock_control/nrf_clock_control.h>
-#include <hal/nrf_hsfll.h>
 
 #include <zephyr/logging/log.h>
 LOG_MODULE_DECLARE(clock_control_nrf2, CONFIG_CLOCK_CONTROL_LOG_LEVEL);
@@ -183,18 +182,6 @@ static int api_cancel_or_release_hsfll(const struct device *dev,
 #endif
 }
 
-static int api_get_rate_hsfll(const struct device *dev,
-			      clock_control_subsys_t sys,
-			      uint32_t *rate)
-{
-	ARG_UNUSED(dev);
-	ARG_UNUSED(sys);
-
-	*rate = nrf_hsfll_clkctrl_mult_get(NRF_HSFLL) * MHZ(16);
-
-	return 0;
-}
-
 static int hsfll_init(const struct device *dev)
 {
 #ifdef CONFIG_NRFS_DVFS_LOCAL_DOMAIN
@@ -221,7 +208,6 @@ static struct nrf_clock_control_driver_api hsfll_drv_api = {
 	.std_api = {
 		.on = api_nosys_on_off,
 		.off = api_nosys_on_off,
-		.get_rate = api_get_rate_hsfll,
 	},
 	.request = api_request_hsfll,
 	.release = api_release_hsfll,