]>
Commit | Line | Data |
---|---|---|
83d290c5 | 1 | // SPDX-License-Identifier: GPL-2.0 |
dd7c7494 PB |
2 | /* |
3 | * Copyright (C) 2016 Imagination Technologies | |
dd7c7494 PB |
4 | */ |
5 | ||
6 | #include <common.h> | |
7 | #include <clk-uclass.h> | |
8 | #include <dm.h> | |
9 | #include <dt-bindings/clock/boston-clock.h> | |
10 | #include <regmap.h> | |
11 | #include <syscon.h> | |
12 | ||
13 | struct clk_boston { | |
14 | struct regmap *regmap; | |
15 | }; | |
16 | ||
17 | #define BOSTON_PLAT_MMCMDIV 0x30 | |
18 | # define BOSTON_PLAT_MMCMDIV_CLK0DIV (0xff << 0) | |
19 | # define BOSTON_PLAT_MMCMDIV_INPUT (0xff << 8) | |
20 | # define BOSTON_PLAT_MMCMDIV_MUL (0xff << 16) | |
21 | # define BOSTON_PLAT_MMCMDIV_CLK1DIV (0xff << 24) | |
22 | ||
23 | static uint32_t ext_field(uint32_t val, uint32_t mask) | |
24 | { | |
25 | return (val & mask) >> (ffs(mask) - 1); | |
26 | } | |
27 | ||
28 | static ulong clk_boston_get_rate(struct clk *clk) | |
29 | { | |
30 | struct clk_boston *state = dev_get_platdata(clk->dev); | |
31 | uint32_t in_rate, mul, div; | |
32 | uint mmcmdiv; | |
33 | int err; | |
34 | ||
35 | err = regmap_read(state->regmap, BOSTON_PLAT_MMCMDIV, &mmcmdiv); | |
36 | if (err) | |
37 | return 0; | |
38 | ||
39 | in_rate = ext_field(mmcmdiv, BOSTON_PLAT_MMCMDIV_INPUT); | |
40 | mul = ext_field(mmcmdiv, BOSTON_PLAT_MMCMDIV_MUL); | |
41 | ||
42 | switch (clk->id) { | |
43 | case BOSTON_CLK_SYS: | |
44 | div = ext_field(mmcmdiv, BOSTON_PLAT_MMCMDIV_CLK0DIV); | |
45 | break; | |
46 | case BOSTON_CLK_CPU: | |
47 | div = ext_field(mmcmdiv, BOSTON_PLAT_MMCMDIV_CLK1DIV); | |
48 | break; | |
49 | default: | |
50 | return 0; | |
51 | } | |
52 | ||
53 | return (in_rate * mul * 1000000) / div; | |
54 | } | |
55 | ||
56 | const struct clk_ops clk_boston_ops = { | |
57 | .get_rate = clk_boston_get_rate, | |
58 | }; | |
59 | ||
60 | static int clk_boston_ofdata_to_platdata(struct udevice *dev) | |
61 | { | |
62 | struct clk_boston *state = dev_get_platdata(dev); | |
63 | struct udevice *syscon; | |
64 | int err; | |
65 | ||
66 | err = uclass_get_device_by_phandle(UCLASS_SYSCON, dev, | |
67 | "regmap", &syscon); | |
68 | if (err) { | |
9b643e31 | 69 | pr_err("unable to find syscon device\n"); |
dd7c7494 PB |
70 | return err; |
71 | } | |
72 | ||
73 | state->regmap = syscon_get_regmap(syscon); | |
74 | if (!state->regmap) { | |
9b643e31 | 75 | pr_err("unable to find regmap\n"); |
dd7c7494 PB |
76 | return -ENODEV; |
77 | } | |
78 | ||
79 | return 0; | |
80 | } | |
81 | ||
82 | static const struct udevice_id clk_boston_match[] = { | |
83 | { | |
84 | .compatible = "img,boston-clock", | |
85 | }, | |
86 | { /* sentinel */ } | |
87 | }; | |
88 | ||
89 | U_BOOT_DRIVER(clk_boston) = { | |
90 | .name = "boston_clock", | |
91 | .id = UCLASS_CLK, | |
92 | .of_match = clk_boston_match, | |
93 | .ofdata_to_platdata = clk_boston_ofdata_to_platdata, | |
94 | .platdata_auto_alloc_size = sizeof(struct clk_boston), | |
95 | .ops = &clk_boston_ops, | |
96 | }; |