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drivers: pwm: Add NXP MCUX PWM driver

This driver handles eFlexPWM submodules via MCUX hal.
Each submodule has two channels (A/B).

Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
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Loic Poulain authored and MaureenHelm committed Mar 6, 2019
1 parent df583f2 commit 447029d7c3efba99894472ec2d7c81d84620ee8d
@@ -13,5 +13,6 @@ zephyr_library_sources_ifdef(CONFIG_PWM_MCUX_FTM pwm_mcux_ftm.c)
zephyr_library_sources_ifdef(CONFIG_PWM_IMX pwm_imx.c)
zephyr_library_sources_ifdef(CONFIG_PWM_LED_ESP32 pwm_led_esp32.c)
zephyr_library_sources_ifdef(CONFIG_PWM_SAM pwm_sam.c)
zephyr_library_sources_ifdef(CONFIG_PWM_MCUX pwm_mcux.c)

zephyr_library_sources_ifdef(CONFIG_USERSPACE pwm_handlers.c)
@@ -54,4 +54,6 @@ source "drivers/pwm/Kconfig.esp32"

source "drivers/pwm/Kconfig.sam"

source "drivers/pwm/Kconfig.mcux"

endif # PWM
@@ -0,0 +1,113 @@
# Kconfig.stm32 - STM32 PWM configuration options
#
#
# Copyright (c) 2019 Linaro Limited.
#
# SPDX-License-Identifier: Apache-2.0
#

menuconfig PWM_MCUX
bool "MCUX PWM driver"
depends on HAS_MCUX_PWM
help
Enable mcux pwm driver.

if PWM_MCUX

config FLEXPWM1_PWM0
bool "NXP MCUX FLEXPWM1_PWM0 Output"
help
Enable output for FLEXPWM1_PWM0 in the driver. Say y here
if you want to use FLEXPWM1_PWM0 output.

config FLEXPWM1_PWM1
bool "NXP MCUX FLEXPWM1_PWM1 Output"
help
Enable output for FLEXPWM1_PWM1 in the driver. Say y here
if you want to use FLEXPWM1_PWM1 output.

config FLEXPWM1_PWM2
bool "NXP MCUX FLEXPWM1_PWM2 Output"
help
Enable output for FLEXPWM1_PWM2 in the driver. Say y here
if you want to use FLEXPWM1_PWM2 output.

config FLEXPWM1_PWM3
bool "NXP MCUX FLEXPWM1_PWM3 Output"
help
Enable output for FLEXPWM1_PWM3 in the driver. Say y here
if you want to use FLEXPWM1_PWM3 output.

config FLEXPWM2_PWM0
bool "NXP MCUX FLEXPWM2_PWM0 Output"
help
Enable output for FLEXPWM2_PWM0 in the driver. Say y here
if you want to use FLEXPWM2_PWM0 output.

config FLEXPWM2_PWM1
bool "NXP MCUX FLEXPWM2_PWM1 Output"
help
Enable output for FLEXPWM2_PWM1 in the driver. Say y here
if you want to use FLEXPWM2_PWM1 output.

config FLEXPWM2_PWM2
bool "NXP MCUX FLEXPWM2_PWM2 Output"
help
Enable output for FLEXPWM2_PWM2 in the driver. Say y here
if you want to use FLEXPWM2_PWM2 output.

config FLEXPWM2_PWM3
bool "NXP MCUX FLEXPWM2_PWM3 Output"
help
Enable output for FLEXPWM2_PWM3 in the driver. Say y here
if you want to use FLEXPWM2_PWM3 output.

config FLEXPWM3_PWM0
bool "NXP MCUX FLEXPWM3_PWM0 Output"
help
Enable output for FLEXPWM3_PWM0 in the driver. Say y here
if you want to use FLEXPWM3_PWM0 output.

config FLEXPWM3_PWM1
bool "NXP MCUX FLEXPWM3_PWM1 Output"
help
Enable output for FLEXPWM3_PWM1 in the driver. Say y here
if you want to use FLEXPWM3_PWM1 output.

config FLEXPWM3_PWM2
bool "NXP MCUX FLEXPWM3_PWM2 Output"
help
Enable output for FLEXPWM3_PWM2 in the driver. Say y here
if you want to use FLEXPWM3_PWM2 output.

config FLEXPWM3_PWM3
bool "NXP MCUX FLEXPWM3_PWM3 Output"
help
Enable output for FLEXPWM3_PWM3 in the driver. Say y here
if you want to use FLEXPWM3_PWM3 output.

config FLEXPWM4_PWM0
bool "NXP MCUX FLEXPWM4_PWM0 Output"
help
Enable output for FLEXPWM4_PWM0 in the driver. Say y here
if you want to use FLEXPWM4_PWM0 output.

config FLEXPWM4_PWM1
bool "NXP MCUX FLEXPWM4_PWM1 Output"
help
Enable output for FLEXPWM4_PWM1 in the driver. Say y here
if you want to use FLEXPWM4_PWM1 output.

config FLEXPWM4_PWM2
bool "NXP MCUX FLEXPWM4_PWM2 Output"
help
Enable output for FLEXPWM4_PWM2 in the driver. Say y here
if you want to use FLEXPWM4_PWM2 output.

config FLEXPWM4_PWM3
bool "NXP MCUX FLEXPWM4_PWM3 Output"
help
Enable output for FLEXPWM4_PWM3 in the driver. Say y here
if you want to use FLEXPWM4_PWM3 output.

endif # PWM_MCUX
@@ -0,0 +1,228 @@
/*
* Copyright (c) 2019, Linaro
*
* SPDX-License-Identifier: Apache-2.0
*/

#include <errno.h>
#include <pwm.h>
#include <soc.h>
#include <fsl_pwm.h>
#include <fsl_clock.h>

#define LOG_LEVEL CONFIG_PWM_LOG_LEVEL
#include <logging/log.h>
LOG_MODULE_REGISTER(pwm_mcux);

#define CHANNEL_COUNT 2

struct pwm_mcux_config {
PWM_Type *base;
uint8_t index;
clock_name_t clock_source;
pwm_clock_prescale_t prescale;
pwm_mode_t mode;
};

struct pwm_mcux_data {
uint32_t period_cycles[CHANNEL_COUNT];
pwm_signal_param_t channel[CHANNEL_COUNT];
};

static int mcux_pwm_pin_set(struct device *dev, u32_t pwm,
u32_t period_cycles, u32_t pulse_cycles)
{
const struct pwm_mcux_config *config = dev->config->config_info;
struct pwm_mcux_data *data = dev->driver_data;
u8_t duty_cycle;

if (pwm >= CHANNEL_COUNT) {
LOG_ERR("Invalid channel");
return -EINVAL;
}

if ((period_cycles == 0) || (pulse_cycles > period_cycles)) {
LOG_ERR("Invalid combination: period_cycles=%u, "
"pulse_cycles=%u", period_cycles, pulse_cycles);
return -EINVAL;
}

if (period_cycles > UINT16_MAX) {
/* 16-bit resolution */
LOG_ERR("Too long period (%u), adjust pwm prescaler!",
period_cycles);
/* TODO: dynamically adjust prescaler */
return -EINVAL;
}

duty_cycle = 100 * pulse_cycles / period_cycles;

/* FIXME: Force re-setup even for duty-cycle update */
if (period_cycles != data->period_cycles[pwm]) {
uint32_t clock_freq;
uint32_t pwm_freq;
status_t status;

data->period_cycles[pwm] = period_cycles;

LOG_DBG("SETUP dutycycle to %u\n", duty_cycle);

clock_freq = CLOCK_GetFreq(config->clock_source);
pwm_freq = (clock_freq >> config->prescale) / period_cycles;

if (pwm_freq == 0) {
LOG_ERR("Could not set up pwm_freq=%d", pwm_freq);
return -EINVAL;
}

PWM_StopTimer(config->base, 1U << config->index);

data->channel[pwm].dutyCyclePercent = duty_cycle;

status = PWM_SetupPwm(config->base, config->index,
&data->channel[0], CHANNEL_COUNT,
config->mode, pwm_freq, clock_freq);
if (status != kStatus_Success) {
LOG_ERR("Could not set up pwm");
return -ENOTSUP;
}

PWM_SetPwmLdok(config->base, 1U << config->index, true);

PWM_StartTimer(config->base, 1U << config->index);
} else {
PWM_UpdatePwmDutycycle(config->base, config->index,
(pwm == 0) ? kPWM_PwmA : kPWM_PwmB,
config->mode, duty_cycle);
PWM_SetPwmLdok(config->base, 1U << config->index, true);
}

return 0;
}

static int mcux_pwm_get_cycles_per_sec(struct device *dev, u32_t pwm,
u64_t *cycles)
{
const struct pwm_mcux_config *config = dev->config->config_info;

*cycles = CLOCK_GetFreq(config->clock_source) >> config->prescale;

return 0;
}

static int pwm_mcux_init(struct device *dev)
{
const struct pwm_mcux_config *config = dev->config->config_info;
struct pwm_mcux_data *data = dev->driver_data;
pwm_config_t pwm_config;
status_t status;

PWM_GetDefaultConfig(&pwm_config);
pwm_config.prescale = config->prescale;
pwm_config.reloadLogic = kPWM_ReloadPwmFullCycle;

status = PWM_Init(config->base, config->index, &pwm_config);
if (status != kStatus_Success) {
LOG_ERR("Unable to init PWM");
return -EIO;
}

/* Disable fault sources */
((PWM_Type *)config->base)->SM[config->index].DISMAP[0] = 0x0000;
((PWM_Type *)config->base)->SM[config->index].DISMAP[1] = 0x0000;

data->channel[0].pwmChannel = kPWM_PwmA;
data->channel[0].level = kPWM_HighTrue;
data->channel[1].pwmChannel = kPWM_PwmB;
data->channel[1].level = kPWM_HighTrue;

return 0;
}

static const struct pwm_driver_api pwm_mcux_driver_api = {
.pin_set = mcux_pwm_pin_set,
.get_cycles_per_sec = mcux_pwm_get_cycles_per_sec,
};

#define PWM_DEVICE_INIT_MCUX(n) \
static struct pwm_mcux_data pwm_mcux_data_ ## n; \
\
static const struct pwm_mcux_config pwm_mcux_config_ ## n = { \
.base = (void *)DT_PWM_MCUX_ ## n ## _BASE_ADDRESS, \
.index = DT_PWM_MCUX_ ## n ## _INDEX, \
.mode = kPWM_EdgeAligned, \
.prescale = kPWM_Prescale_Divide_128, \
.clock_source = kCLOCK_IpgClk, \
}; \
\
DEVICE_AND_API_INIT(pwm_mcux_ ## n, \
DT_PWM_MCUX_ ## n ## _NAME, \
pwm_mcux_init, \
&pwm_mcux_data_ ## n, \
&pwm_mcux_config_ ## n, \
POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,\
&pwm_mcux_driver_api);

#ifdef CONFIG_FLEXPWM1_PWM0
PWM_DEVICE_INIT_MCUX(0)
#endif

#ifdef CONFIG_FLEXPWM1_PWM1
PWM_DEVICE_INIT_MCUX(1)
#endif

#ifdef CONFIG_FLEXPWM1_PWM2
PWM_DEVICE_INIT_MCUX(2)
#endif

#ifdef CONFIG_FLEXPWM1_PWM3
PWM_DEVICE_INIT_MCUX(3)
#endif

#ifdef CONFIG_FLEXPWM2_PWM0
PWM_DEVICE_INIT_MCUX(4)
#endif

#ifdef CONFIG_FLEXPWM2_PWM1
PWM_DEVICE_INIT_MCUX(5)
#endif

#ifdef CONFIG_FLEXPWM2_PWM2
PWM_DEVICE_INIT_MCUX(6)
#endif

#ifdef CONFIG_FLEXPWM2_PWM3
PWM_DEVICE_INIT_MCUX(7)
#endif

#ifdef CONFIG_FLEXPWM3_PWM0
PWM_DEVICE_INIT_MCUX(8)
#endif

#ifdef CONFIG_FLEXPWM3_PWM1
PWM_DEVICE_INIT_MCUX(9)
#endif

#ifdef CONFIG_FLEXPWM3_PWM2
PWM_DEVICE_INIT_MCUX(10)
#endif

#ifdef CONFIG_FLEXPWM3_PWM3
PWM_DEVICE_INIT_MCUX(11)
#endif

#ifdef CONFIG_FLEXPWM4_PWM0
PWM_DEVICE_INIT_MCUX(12)
#endif

#ifdef CONFIG_FLEXPWM4_PWM1
PWM_DEVICE_INIT_MCUX(13)
#endif

#ifdef CONFIG_FLEXPWM4_PWM2
PWM_DEVICE_INIT_MCUX(14)
#endif

#ifdef CONFIG_FLEXPWM4_PWM3
PWM_DEVICE_INIT_MCUX(15)
#endif
@@ -23,3 +23,4 @@ zephyr_sources_ifdef(CONFIG_UART_MCUX_LPUART fsl_lpuart.c)
zephyr_sources_ifdef(CONFIG_COUNTER_MCUX_GPT fsl_gpt.c)
zephyr_sources_ifdef(CONFIG_ETH_MCUX fsl_enet.c)
zephyr_sources_ifdef(CONFIG_ENTROPY_MCUX_TRNG fsl_trng.c)
zephyr_sources_ifdef(CONFIG_PWM_MCUX fsl_pwm.c)

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