diff options
Diffstat (limited to 'drivers/mfd/stm32-timers.c')
-rw-r--r-- | drivers/mfd/stm32-timers.c | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/drivers/mfd/stm32-timers.c b/drivers/mfd/stm32-timers.c new file mode 100644 index 0000000000..3b47800105 --- /dev/null +++ b/drivers/mfd/stm32-timers.c @@ -0,0 +1,76 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * 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 <linux/regmap.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 *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->of_node, NULL, dev); +} + +static const struct of_device_id stm32_timers_of_match[] = { + { .compatible = "st,stm32-timers", }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, stm32_timers_of_match); + +static struct driver stm32_timers_driver = { + .name = "stm32-timers", + .probe = stm32_timers_probe, + .of_compatible = stm32_timers_of_match, +}; +coredevice_platform_driver(stm32_timers_driver); |