~funderscore blog cgit wiki get in touch
aboutsummaryrefslogtreecommitdiff
blob: c5214b9b3e2ebaf5902e5203522e91a019781a91 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2016, NVIDIA CORPORATION.
 */

#include <common.h>
#include <clk-uclass.h>
#include <dm.h>
#include <log.h>
#include <malloc.h>
#include <asm/arch/clock.h>
#include <asm/arch-tegra/clk_rst.h>

static int tegra_car_clk_request(struct clk *clk)
{
	debug("%s(clk=%p) (dev=%p, id=%lu)\n", __func__, clk, clk->dev,
	      clk->id);

	/*
	 * Note that the first PERIPH_ID_COUNT clock IDs (where the value
	 * varies per SoC) are the peripheral clocks, which use a numbering
	 * scheme that matches HW registers 1:1. There are other clock IDs
	 * beyond this that are assigned arbitrarily by the Tegra CAR DT
	 * binding. Due to the implementation of this driver, it currently
	 * only supports the peripheral IDs.
	 */
	if (clk->id >= PERIPH_ID_COUNT)
		return -EINVAL;

	return 0;
}

static ulong tegra_car_clk_get_rate(struct clk *clk)
{
	enum clock_id parent;

	debug("%s(clk=%p) (dev=%p, id=%lu)\n", __func__, clk, clk->dev,
	      clk->id);

	parent = clock_get_periph_parent(clk->id);
	return clock_get_periph_rate(clk->id, parent);
}

static ulong tegra_car_clk_set_rate(struct clk *clk, ulong rate)
{
	enum clock_id parent;

	debug("%s(clk=%p, rate=%lu) (dev=%p, id=%lu)\n", __func__, clk, rate,
	      clk->dev, clk->id);

	parent = clock_get_periph_parent(clk->id);
	return clock_adjust_periph_pll_div(clk->id, parent, rate, NULL);
}

static int tegra_car_clk_enable(struct clk *clk)
{
	debug("%s(clk=%p) (dev=%p, id=%lu)\n", __func__, clk, clk->dev,
	      clk->id);

	clock_enable(clk->id);

	return 0;
}

static int tegra_car_clk_disable(struct clk *clk)
{
	debug("%s(clk=%p) (dev=%p, id=%lu)\n", __func__, clk, clk->dev,
	      clk->id);

	clock_disable(clk->id);

	return 0;
}

static struct clk_ops tegra_car_clk_ops = {
	.request = tegra_car_clk_request,
	.get_rate = tegra_car_clk_get_rate,
	.set_rate = tegra_car_clk_set_rate,
	.enable = tegra_car_clk_enable,
	.disable = tegra_car_clk_disable,
};

static int tegra_car_clk_probe(struct udevice *dev)
{
	debug("%s(dev=%p)\n", __func__, dev);

	return 0;
}

U_BOOT_DRIVER(tegra_car_clk) = {
	.name = "tegra_car_clk",
	.id = UCLASS_CLK,
	.probe = tegra_car_clk_probe,
	.ops = &tegra_car_clk_ops,
};