1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * Copyright (C) STMicroelectronics 2016
 4 * Author: Benjamin Gaignard <benjamin.gaignard@st.com>
 5 */
 6
 7#include <linux/mfd/stm32-timers.h>
 8#include <linux/module.h>
 9#include <linux/of_platform.h>
10#include <linux/reset.h>
11
12static const struct regmap_config stm32_timers_regmap_cfg = {
13	.reg_bits = 32,
14	.val_bits = 32,
15	.reg_stride = sizeof(u32),
16	.max_register = 0x3fc,
17};
18
19static void stm32_timers_get_arr_size(struct stm32_timers *ddata)
20{
21	/*
22	 * Only the available bits will be written so when readback
23	 * we get the maximum value of auto reload register
24	 */
25	regmap_write(ddata->regmap, TIM_ARR, ~0L);
26	regmap_read(ddata->regmap, TIM_ARR, &ddata->max_arr);
27	regmap_write(ddata->regmap, TIM_ARR, 0x0);
28}
29
30static int stm32_timers_probe(struct platform_device *pdev)
31{
32	struct device *dev = &pdev->dev;
33	struct stm32_timers *ddata;
34	struct resource *res;
35	void __iomem *mmio;
36
37	ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
38	if (!ddata)
39		return -ENOMEM;
40
41	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
42	mmio = devm_ioremap_resource(dev, res);
43	if (IS_ERR(mmio))
44		return PTR_ERR(mmio);
45
46	ddata->regmap = devm_regmap_init_mmio_clk(dev, "int", mmio,
47						  &stm32_timers_regmap_cfg);
48	if (IS_ERR(ddata->regmap))
49		return PTR_ERR(ddata->regmap);
50
51	ddata->clk = devm_clk_get(dev, NULL);
52	if (IS_ERR(ddata->clk))
53		return PTR_ERR(ddata->clk);
54
55	stm32_timers_get_arr_size(ddata);
56
57	platform_set_drvdata(pdev, ddata);
58
59	return devm_of_platform_populate(&pdev->dev);
60}
61
62static const struct of_device_id stm32_timers_of_match[] = {
63	{ .compatible = "st,stm32-timers", },
64	{ /* end node */ },
65};
66MODULE_DEVICE_TABLE(of, stm32_timers_of_match);
67
68static struct platform_driver stm32_timers_driver = {
69	.probe = stm32_timers_probe,
70	.driver	= {
71		.name = "stm32-timers",
72		.of_match_table = stm32_timers_of_match,
73	},
74};
75module_platform_driver(stm32_timers_driver);
76
77MODULE_DESCRIPTION("STMicroelectronics STM32 Timers");
78MODULE_LICENSE("GPL v2");