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author | Ahmad Fatoum <a.fatoum@pengutronix.de> | 2020-03-30 16:57:17 +0200 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2020-03-31 09:48:34 +0200 |
commit | b2cd220105a6bd03ff819a99ce0c3c853a6d00f3 (patch) | |
tree | 9c1c71004195a783565944ae16fcac234cdb7c58 /drivers/mfd | |
parent | 35dd94be1eac9b44bc00b849522b15569b9d083a (diff) | |
download | barebox-b2cd220105a6bd03ff819a99ce0c3c853a6d00f3.tar.gz barebox-b2cd220105a6bd03ff819a99ce0c3c853a6d00f3.tar.xz |
PWM: add support for STM32
This driver adds support for PWM driver on STM32 platform
based on the Linux v5.4 support.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'drivers/mfd')
-rw-r--r-- | drivers/mfd/Kconfig | 7 | ||||
-rw-r--r-- | drivers/mfd/Makefile | 1 | ||||
-rw-r--r-- | drivers/mfd/stm32-timers.c | 74 |
3 files changed, 82 insertions, 0 deletions
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index f4cc71ef0e..ddf117712e 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -82,4 +82,11 @@ config SMSC_SUPERIO help Select this to probe for IO-port connected SMSC Super I/O chips. +config MFD_STM32_TIMERS + bool "STM32 Timers" + depends on ARCH_STM32MP + help + Select this to get regmap support for the timer blocks on STM32 + MCUs and MPUs. + endmenu diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 0c24493e3d..a3b296a803 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -15,3 +15,4 @@ obj-$(CONFIG_MFD_STPMIC1) += stpmic1.o obj-$(CONFIG_MFD_SUPERIO) += superio.o obj-$(CONFIG_FINTEK_SUPERIO) += fintek-superio.o obj-$(CONFIG_SMSC_SUPERIO) += smsc-superio.o +obj-$(CONFIG_MFD_STM32_TIMERS) += stm32-timers.o diff --git a/drivers/mfd/stm32-timers.c b/drivers/mfd/stm32-timers.c new file mode 100644 index 0000000000..c53a25687e --- /dev/null +++ b/drivers/mfd/stm32-timers.c @@ -0,0 +1,74 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) STMicroelectronics 2016 + * Author: Benjamin Gaignard <benjamin.gaignard@st.com> + */ + +#include <common.h> +#include <linux/clk.h> +#include <driver.h> +#include <init.h> +#include <io.h> +#include <linux/bitfield.h> +#include <linux/mfd/stm32-timers.h> +#include <of.h> +#include <linux/reset.h> + +#define STM32_TIMERS_MAX_REGISTERS 0x3fc + +static const struct regmap_config stm32_timers_regmap_cfg = { + .reg_bits = 32, + .val_bits = 32, + .reg_stride = sizeof(u32), + .max_register = STM32_TIMERS_MAX_REGISTERS, +}; + +static void stm32_timers_get_arr_size(struct stm32_timers *ddata) +{ + /* + * Only the available bits will be written so when readback + * we get the maximum value of auto reload register + */ + regmap_write(ddata->regmap, TIM_ARR, ~0L); + regmap_read(ddata->regmap, TIM_ARR, &ddata->max_arr); + regmap_write(ddata->regmap, TIM_ARR, 0x0); +} + +static int stm32_timers_probe(struct device_d *dev) +{ + struct stm32_timers *ddata; + struct resource *res; + + ddata = xzalloc(sizeof(*ddata)); + + res = dev_request_mem_resource(dev, 0); + if (IS_ERR(res)) + return PTR_ERR(res); + + ddata->regmap = regmap_init_mmio_clk(dev, "int", IOMEM(res->start), + &stm32_timers_regmap_cfg); + if (IS_ERR(ddata->regmap)) + return PTR_ERR(ddata->regmap); + + ddata->clk = clk_get(dev, NULL); + if (IS_ERR(ddata->clk)) + return PTR_ERR(ddata->clk); + + stm32_timers_get_arr_size(ddata); + + dev->priv = ddata; + + return of_platform_populate(dev->device_node, NULL, dev); +} + +static const struct of_device_id stm32_timers_of_match[] = { + { .compatible = "st,stm32-timers", }, + { /* sentinel */ }, +}; + +static struct driver_d stm32_timers_driver = { + .name = "stm32-timers", + .probe = stm32_timers_probe, + .of_compatible = stm32_timers_of_match, +}; +coredevice_platform_driver(stm32_timers_driver); |