2 * Copyright (C) STMicroelectronics 2016
4 * Author: Benjamin Gaignard <benjamin.gaignard@st.com>
6 * License terms: GNU General Public License (GPL), version 2
9 #include <linux/mfd/stm32-timers.h>
10 #include <linux/module.h>
11 #include <linux/of_platform.h>
12 #include <linux/reset.h>
14 static const struct regmap_config stm32_timers_regmap_cfg = {
17 .reg_stride = sizeof(u32),
18 .max_register = 0x3fc,
21 static void stm32_timers_get_arr_size(struct stm32_timers *ddata)
25 /* Backup ARR to restore it after getting the maximum value */
26 regmap_read(ddata->regmap, TIM_ARR, &arr);
29 * Only the available bits will be written so when readback
30 * we get the maximum value of auto reload register
32 regmap_write(ddata->regmap, TIM_ARR, ~0L);
33 regmap_read(ddata->regmap, TIM_ARR, &ddata->max_arr);
34 regmap_write(ddata->regmap, TIM_ARR, arr);
37 static int stm32_timers_probe(struct platform_device *pdev)
39 struct device *dev = &pdev->dev;
40 struct stm32_timers *ddata;
44 ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
48 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
49 mmio = devm_ioremap_resource(dev, res);
53 ddata->regmap = devm_regmap_init_mmio_clk(dev, "int", mmio,
54 &stm32_timers_regmap_cfg);
55 if (IS_ERR(ddata->regmap))
56 return PTR_ERR(ddata->regmap);
58 ddata->clk = devm_clk_get(dev, NULL);
59 if (IS_ERR(ddata->clk))
60 return PTR_ERR(ddata->clk);
62 stm32_timers_get_arr_size(ddata);
64 platform_set_drvdata(pdev, ddata);
66 return devm_of_platform_populate(&pdev->dev);
69 static const struct of_device_id stm32_timers_of_match[] = {
70 { .compatible = "st,stm32-timers", },
73 MODULE_DEVICE_TABLE(of, stm32_timers_of_match);
75 static struct platform_driver stm32_timers_driver = {
76 .probe = stm32_timers_probe,
78 .name = "stm32-timers",
79 .of_match_table = stm32_timers_of_match,
82 module_platform_driver(stm32_timers_driver);
84 MODULE_DESCRIPTION("STMicroelectronics STM32 Timers");
85 MODULE_LICENSE("GPL v2");