blob: f78762c451f93519d2eae9430824272c0724d183 [file] [log] [blame]
/*
* Copyright (c) 2022 Vestas Wind Systems A/S
* Copyright (c) 2022 Blue Clover
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr/drivers/can.h>
#include <zephyr/drivers/clock_control/stm32_clock_control.h>
#include <zephyr/drivers/clock_control.h>
#include <zephyr/drivers/pinctrl.h>
#include <zephyr/kernel.h>
#include <stm32_ll_rcc.h>
#include <zephyr/logging/log.h>
#include "can_mcan.h"
LOG_MODULE_REGISTER(can_stm32h7, CONFIG_CAN_LOG_LEVEL);
#define DT_DRV_COMPAT st_stm32h7_fdcan
struct can_stm32h7_config {
void (*config_irq)(void);
const struct pinctrl_dev_config *pcfg;
struct stm32_pclken pclken;
};
static int can_stm32h7_get_core_clock(const struct device *dev, uint32_t *rate)
{
const uint32_t rate_tmp = LL_RCC_GetFDCANClockFreq(LL_RCC_FDCAN_CLKSOURCE);
ARG_UNUSED(dev);
if (rate_tmp == LL_RCC_PERIPH_FREQUENCY_NO) {
LOG_ERR("Can't read core clock");
return -EIO;
}
*rate = rate_tmp;
LOG_DBG("rate=%d", *rate);
return 0;
}
static int can_stm32h7_clock_enable(const struct device *dev)
{
const struct can_mcan_config *mcan_cfg = dev->config;
const struct can_stm32h7_config *stm32h7_cfg = mcan_cfg->custom;
const struct device *clk = DEVICE_DT_GET(STM32_CLOCK_CONTROL_NODE);
int ret;
LL_RCC_SetFDCANClockSource(LL_RCC_FDCAN_CLKSOURCE_PLL1Q);
ret = clock_control_on(clk, (clock_control_subsys_t *)&stm32h7_cfg->pclken);
if (ret != 0) {
LOG_ERR("failure enabling clock");
return ret;
}
if (!LL_RCC_PLL1Q_IsEnabled()) {
LOG_ERR("PLL1Q clock must be enabled!");
return -EIO;
}
return 0;
}
static int can_stm32h7_init(const struct device *dev)
{
const struct can_mcan_config *mcan_cfg = dev->config;
const struct can_stm32h7_config *stm32h7_cfg = mcan_cfg->custom;
int ret;
/* Configure dt provided device signals when available */
ret = pinctrl_apply_state(stm32h7_cfg->pcfg, PINCTRL_STATE_DEFAULT);
if (ret != 0) {
LOG_ERR("CAN pinctrl setup failed (%d)", ret);
return ret;
}
ret = can_stm32h7_clock_enable(dev);
if (ret != 0) {
return ret;
}
ret = can_mcan_init(dev);
if (ret != 0) {
return ret;
}
stm32h7_cfg->config_irq();
return 0;
}
static const struct can_driver_api can_stm32h7_driver_api = {
.set_mode = can_mcan_set_mode,
.set_timing = can_mcan_set_timing,
.send = can_mcan_send,
.add_rx_filter = can_mcan_add_rx_filter,
.remove_rx_filter = can_mcan_remove_rx_filter,
.get_state = can_mcan_get_state,
#ifndef CONFIG_CAN_AUTO_BUS_OFF_RECOVERY
.recover = can_mcan_recover,
#endif
.get_core_clock = can_stm32h7_get_core_clock,
.get_max_bitrate = can_mcan_get_max_bitrate,
.get_max_filters = can_mcan_get_max_filters,
.set_state_change_callback = can_mcan_set_state_change_callback,
/* Timing limits are per the STM32H7 Reference Manual (RM0433 Rev 7),
* section 56.5.7, FDCAN nominal bit timing and prescaler register
* (FDCAN_NBTP).
*/
.timing_min = {
.sjw = 0x01,
.prop_seg = 0x00,
.phase_seg1 = 0x01,
.phase_seg2 = 0x01,
.prescaler = 0x01
},
.timing_max = {
.sjw = 0x80,
.prop_seg = 0x00,
.phase_seg1 = 0x100,
.phase_seg2 = 0x80,
.prescaler = 0x200
},
#ifdef CONFIG_CAN_FD_MODE
.set_timing_data = can_mcan_set_timing_data,
/* Data timing limits are per the STM32H7 Reference Manual
* (RM0433 Rev 7), section 56.5.3, FDCAN data bit timing and prescaler
* register (FDCAN_DBTP).
*/
.timing_data_min = {
.sjw = 0x01,
.prop_seg = 0x00,
.phase_seg1 = 0x01,
.phase_seg2 = 0x01,
.prescaler = 0x01
},
.timing_data_max = {
.sjw = 0x10,
.prop_seg = 0x00,
.phase_seg1 = 0x20,
.phase_seg2 = 0x10,
.prescaler = 0x20
}
#endif
};
#define CAN_STM32H7_MCAN_INIT(n) \
static void stm32h7_mcan_irq_config_##n(void); \
\
PINCTRL_DT_INST_DEFINE(n); \
\
static const struct can_stm32h7_config can_stm32h7_cfg_##n = { \
.config_irq = stm32h7_mcan_irq_config_##n, \
.pcfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n), \
.pclken = { \
.enr = DT_INST_CLOCKS_CELL(n, bits), \
.bus = DT_INST_CLOCKS_CELL(n, bus), \
}, \
}; \
\
static const struct can_mcan_config can_mcan_cfg_##n = \
CAN_MCAN_DT_CONFIG_INST_GET(n, &can_stm32h7_cfg_##n); \
\
static struct can_mcan_data can_mcan_data_##n = \
CAN_MCAN_DATA_INITIALIZER((struct can_mcan_msg_sram *) \
DT_INST_REG_ADDR_BY_NAME(n, message_ram), NULL); \
\
DEVICE_DT_INST_DEFINE(n, &can_stm32h7_init, NULL, \
&can_mcan_data_##n, \
&can_mcan_cfg_##n, \
POST_KERNEL, CONFIG_CAN_INIT_PRIORITY, \
&can_stm32h7_driver_api); \
\
static void stm32h7_mcan_irq_config_##n(void) \
{ \
LOG_DBG("Enable CAN inst" #n " IRQ"); \
IRQ_CONNECT(DT_INST_IRQ_BY_NAME(n, line_0, irq), \
DT_INST_IRQ_BY_NAME(n, line_0, priority), \
can_mcan_line_0_isr, DEVICE_DT_INST_GET(n), 0); \
irq_enable(DT_INST_IRQ_BY_NAME(n, line_0, irq)); \
IRQ_CONNECT(DT_INST_IRQ_BY_NAME(n, line_1, irq), \
DT_INST_IRQ_BY_NAME(n, line_1, priority), \
can_mcan_line_1_isr, DEVICE_DT_INST_GET(n), 0); \
irq_enable(DT_INST_IRQ_BY_NAME(n, line_1, irq)); \
}
DT_INST_FOREACH_STATUS_OKAY(CAN_STM32H7_MCAN_INIT)