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d0f949e2 BG |
1 | /* |
2 | * Copyright (C) STMicroelectronics 2016 | |
3 | * | |
4 | * Author: Benjamin Gaignard <benjamin.gaignard@st.com> | |
5 | * | |
6 | * License terms: GNU General Public License (GPL), version 2 | |
7 | */ | |
8 | ||
9 | #include <linux/mfd/stm32-timers.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/of_platform.h> | |
12 | #include <linux/reset.h> | |
13 | ||
14 | static const struct regmap_config stm32_timers_regmap_cfg = { | |
15 | .reg_bits = 32, | |
16 | .val_bits = 32, | |
17 | .reg_stride = sizeof(u32), | |
ae6816ba | 18 | .max_register = 0x3fc, |
d0f949e2 BG |
19 | }; |
20 | ||
21 | static void stm32_timers_get_arr_size(struct stm32_timers *ddata) | |
22 | { | |
23 | /* | |
24 | * Only the available bits will be written so when readback | |
25 | * we get the maximum value of auto reload register | |
26 | */ | |
27 | regmap_write(ddata->regmap, TIM_ARR, ~0L); | |
28 | regmap_read(ddata->regmap, TIM_ARR, &ddata->max_arr); | |
29 | regmap_write(ddata->regmap, TIM_ARR, 0x0); | |
30 | } | |
31 | ||
32 | static int stm32_timers_probe(struct platform_device *pdev) | |
33 | { | |
34 | struct device *dev = &pdev->dev; | |
35 | struct stm32_timers *ddata; | |
36 | struct resource *res; | |
37 | void __iomem *mmio; | |
38 | ||
39 | ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL); | |
40 | if (!ddata) | |
41 | return -ENOMEM; | |
42 | ||
43 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
44 | mmio = devm_ioremap_resource(dev, res); | |
45 | if (IS_ERR(mmio)) | |
46 | return PTR_ERR(mmio); | |
47 | ||
48 | ddata->regmap = devm_regmap_init_mmio_clk(dev, "int", mmio, | |
49 | &stm32_timers_regmap_cfg); | |
50 | if (IS_ERR(ddata->regmap)) | |
51 | return PTR_ERR(ddata->regmap); | |
52 | ||
53 | ddata->clk = devm_clk_get(dev, NULL); | |
54 | if (IS_ERR(ddata->clk)) | |
55 | return PTR_ERR(ddata->clk); | |
56 | ||
57 | stm32_timers_get_arr_size(ddata); | |
58 | ||
59 | platform_set_drvdata(pdev, ddata); | |
60 | ||
61 | return of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev); | |
62 | } | |
63 | ||
f8b7ce67 FG |
64 | static int stm32_timers_remove(struct platform_device *pdev) |
65 | { | |
66 | of_platform_depopulate(&pdev->dev); | |
67 | ||
68 | return 0; | |
69 | } | |
70 | ||
d0f949e2 BG |
71 | static const struct of_device_id stm32_timers_of_match[] = { |
72 | { .compatible = "st,stm32-timers", }, | |
73 | { /* end node */ }, | |
74 | }; | |
75 | MODULE_DEVICE_TABLE(of, stm32_timers_of_match); | |
76 | ||
77 | static struct platform_driver stm32_timers_driver = { | |
78 | .probe = stm32_timers_probe, | |
f8b7ce67 | 79 | .remove = stm32_timers_remove, |
d0f949e2 BG |
80 | .driver = { |
81 | .name = "stm32-timers", | |
82 | .of_match_table = stm32_timers_of_match, | |
83 | }, | |
84 | }; | |
85 | module_platform_driver(stm32_timers_driver); | |
86 | ||
87 | MODULE_DESCRIPTION("STMicroelectronics STM32 Timers"); | |
88 | MODULE_LICENSE("GPL v2"); |