[PATCH 2/5] mach-stm32: add multifunction timer driver support
Patrice CHOTARD
patrice.chotard at foss.st.com
Thu Mar 6 15:16:57 CET 2025
On 3/6/25 11:56, Cheick Traore wrote:
> Add support for STM32MP timer multi-function driver.
> These timers can be use as counter, trigger or pwm generator.
> This driver will be used to manage the main resources of the timer to
> provide them to the functionnalities which need these ones.
>
> Signed-off-by: Cheick Traore <cheick.traore at foss.st.com>
> ---
>
> arch/arm/mach-stm32mp/Kconfig | 6 ++
> arch/arm/mach-stm32mp/Makefile | 1 +
> arch/arm/mach-stm32mp/include/mach/timers.h | 55 ++++++++++++++
> arch/arm/mach-stm32mp/timers.c | 82 +++++++++++++++++++++
> 4 files changed, 144 insertions(+)
> create mode 100644 arch/arm/mach-stm32mp/include/mach/timers.h
> create mode 100644 arch/arm/mach-stm32mp/timers.c
>
> diff --git a/arch/arm/mach-stm32mp/Kconfig b/arch/arm/mach-stm32mp/Kconfig
> index 25663a99464..002da2e3d3b 100644
> --- a/arch/arm/mach-stm32mp/Kconfig
> +++ b/arch/arm/mach-stm32mp/Kconfig
> @@ -153,6 +153,12 @@ config CMD_STM32KEY
> This command is used to evaluate the secure boot on stm32mp SOC,
> it is deactivated by default in real products.
>
> +config MFD_STM32_TIMERS
> + bool "STM32 multifonction timer support"
> + help
> + Select this to enable support for the multifunction timer found on
> + STM32 devices.
> +
> source "arch/arm/mach-stm32mp/Kconfig.13x"
> source "arch/arm/mach-stm32mp/Kconfig.15x"
> source "arch/arm/mach-stm32mp/Kconfig.25x"
> diff --git a/arch/arm/mach-stm32mp/Makefile b/arch/arm/mach-stm32mp/Makefile
> index db7ed19bd91..103e3410ad9 100644
> --- a/arch/arm/mach-stm32mp/Makefile
> +++ b/arch/arm/mach-stm32mp/Makefile
> @@ -12,6 +12,7 @@ obj-$(CONFIG_STM32MP15X) += stm32mp1/
> obj-$(CONFIG_STM32MP13X) += stm32mp1/
> obj-$(CONFIG_STM32MP25X) += stm32mp2/
>
> +obj-$(CONFIG_MFD_STM32_TIMERS) += timers.o
> obj-$(CONFIG_STM32_ECDSA_VERIFY) += ecdsa_romapi.o
> ifndef CONFIG_XPL_BUILD
> obj-y += cmd_stm32prog/
> diff --git a/arch/arm/mach-stm32mp/include/mach/timers.h b/arch/arm/mach-stm32mp/include/mach/timers.h
> new file mode 100644
> index 00000000000..a84465bb28e
> --- /dev/null
> +++ b/arch/arm/mach-stm32mp/include/mach/timers.h
> @@ -0,0 +1,55 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * Copyright (C) 2025, STMicroelectronics - All Rights Reserved
> + * Author: Cheick Traore <cheick.traore at foss.st.com>
> + *
> + * Originally based on the Linux kernel v6.1 include/linux/mfd/stm32-timers.h.
> + */
> +
> +#ifndef __STM32_TIMERS_H
> +#define __STM32_TIMERS_H
> +
> +#include <clk.h>
> +
> +#define TIM_CR1 0x00 /* Control Register 1 */
> +#define TIM_CR2 0x04 /* Control Register 2 */
> +#define TIM_SMCR 0x08 /* Slave mode control reg */
> +#define TIM_DIER 0x0C /* DMA/interrupt register */
> +#define TIM_SR 0x10 /* Status register */
> +#define TIM_EGR 0x14 /* Event Generation Reg */
> +#define TIM_CCMR1 0x18 /* Capt/Comp 1 Mode Reg */
> +#define TIM_CCMR2 0x1C /* Capt/Comp 2 Mode Reg */
> +#define TIM_CCER 0x20 /* Capt/Comp Enable Reg */
> +#define TIM_CNT 0x24 /* Counter */
> +#define TIM_PSC 0x28 /* Prescaler */
> +#define TIM_ARR 0x2c /* Auto-Reload Register */
> +#define TIM_CCRx(x) (0x34 + 4 * ((x) - 1)) /* Capt/Comp Register x (x ∈ {1, .. 4}) */
> +#define TIM_BDTR 0x44 /* Break and Dead-Time Reg */
> +#define TIM_DCR 0x48 /* DMA control register */
> +#define TIM_DMAR 0x4C /* DMA register for transfer */
> +#define TIM_TISEL 0x68 /* Input Selection */
> +
> +#define TIM_CR1_CEN BIT(0) /* Counter Enable */
> +#define TIM_CR1_ARPE BIT(7)
> +#define TIM_CCER_CCXE (BIT(0) | BIT(4) | BIT(8) | BIT(12))
> +#define TIM_CCER_CC1E BIT(0)
> +#define TIM_CCER_CC1P BIT(1) /* Capt/Comp 1 Polarity */
> +#define TIM_CCER_CC1NE BIT(2) /* Capt/Comp 1N out Ena */
> +#define TIM_CCER_CC1NP BIT(3) /* Capt/Comp 1N Polarity */
> +#define TIM_CCMR_PE BIT(3) /* Channel Preload Enable */
> +#define TIM_CCMR_M1 (BIT(6) | BIT(5)) /* Channel PWM Mode 1 */
> +#define TIM_BDTR_MOE BIT(15) /* Main Output Enable */
> +#define TIM_EGR_UG BIT(0) /* Update Generation */
> +
> +#define MAX_TIM_PSC 0xFFFF
> +
> +struct stm32_timers_plat {
> + void __iomem *base;
> +};
> +
> +struct stm32_timers_priv {
> + u32 max_arr;
> + ulong rate;
> +};
> +
> +#endif
> diff --git a/arch/arm/mach-stm32mp/timers.c b/arch/arm/mach-stm32mp/timers.c
> new file mode 100644
> index 00000000000..a3207895f40
> --- /dev/null
> +++ b/arch/arm/mach-stm32mp/timers.c
> @@ -0,0 +1,82 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (C) 2025, STMicroelectronics - All Rights Reserved
> + * Author: Cheick Traore <cheick.traore at foss.st.com>
> + *
> + * Originally based on the Linux kernel v6.1 drivers/mfd/stm32-timers.c.
> + */
> +
> +#include <dm.h>
> +#include <asm/io.h>
> +#include <asm/arch/timers.h>
> +#include <dm/device_compat.h>
> +
> +static void stm32_timers_get_arr_size(struct udevice *dev)
> +{
> + struct stm32_timers_plat *plat = dev_get_plat(dev);
> + struct stm32_timers_priv *priv = dev_get_priv(dev);
> + u32 arr;
> +
> + /* Backup ARR to restore it after getting the maximum value */
> + arr = readl(plat->base + TIM_ARR);
> +
> + /*
> + * Only the available bits will be written so when readback
> + * we get the maximum value of auto reload register
> + */
> + writel(~0L, plat->base + TIM_ARR);
> + priv->max_arr = readl(plat->base + TIM_ARR);
> + writel(arr, plat->base + TIM_ARR);
> +}
> +
> +static int stm32_timers_of_to_plat(struct udevice *dev)
> +{
> + struct stm32_timers_plat *plat = dev_get_plat(dev);
> +
> + plat->base = dev_read_addr_ptr(dev);
> + if (!plat->base) {
> + dev_err(dev, "can't get address\n");
> + return -ENOENT;
> + }
> +
> + return 0;
> +}
> +
> +static int stm32_timers_probe(struct udevice *dev)
> +{
> + struct stm32_timers_priv *priv = dev_get_priv(dev);
> + struct clk clk;
> + int ret = 0;
> +
> + ret = clk_get_by_index(dev, 0, &clk);
> + if (ret < 0)
> + return ret;
> +
> + ret = clk_enable(&clk);
> + if (ret) {
> + dev_err(dev, "failed to enable clock: ret=%d\n", ret);
> + return ret;
> + }
> +
> + priv->rate = clk_get_rate(&clk);
> +
> + stm32_timers_get_arr_size(dev);
> +
> + return ret;
> +}
> +
> +static const struct udevice_id stm32_timers_ids[] = {
> + { .compatible = "st,stm32-timers" },
> + {}
> +};
> +
> +U_BOOT_DRIVER(stm32_timers) = {
> + .name = "stm32_timers",
> + .id = UCLASS_NOP,
> + .of_match = stm32_timers_ids,
> + .of_to_plat = stm32_timers_of_to_plat,
> + .plat_auto = sizeof(struct stm32_timers_plat),
> + .probe = stm32_timers_probe,
> + .priv_auto = sizeof(struct stm32_timers_priv),
> + .bind = dm_scan_fdt_dev,
> +};
Reviewed-by: Patrice Chotard <patrice.chotard at foss.st.com>
Thanks
Patrice
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