aboutsummaryrefslogtreecommitdiff
path: root/drivers/clk/tegra/clk-tegra-pmc.c
blob: 08b21c1ee867e6d898699b904afa6a93781eff3e (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
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
/*
 * Copyright (c) 2012, 2013, NVIDIA CORPORATION.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/io.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/clkdev.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/delay.h>
#include <linux/export.h>
#include <linux/clk/tegra.h>

#include "clk.h"
#include "clk-id.h"

#define PMC_CLK_OUT_CNTRL 0x1a8
#define PMC_DPD_PADS_ORIDE 0x1c
#define PMC_DPD_PADS_ORIDE_BLINK_ENB 20
#define PMC_CTRL 0
#define PMC_CTRL_BLINK_ENB 7
#define PMC_BLINK_TIMER 0x40

struct pmc_clk_init_data {
	char *mux_name;
	char *gate_name;
	const char **parents;
	int num_parents;
	int mux_id;
	int gate_id;
	char *dev_name;
	u8 mux_shift;
	u8 gate_shift;
};

#define PMC_CLK(_num, _mux_shift, _gate_shift)\
	{\
		.mux_name = "clk_out_" #_num "_mux",\
		.gate_name = "clk_out_" #_num,\
		.parents = clk_out ##_num ##_parents,\
		.num_parents = ARRAY_SIZE(clk_out ##_num ##_parents),\
		.mux_id = tegra_clk_clk_out_ ##_num ##_mux,\
		.gate_id = tegra_clk_clk_out_ ##_num,\
		.dev_name = "extern" #_num,\
		.mux_shift = _mux_shift,\
		.gate_shift = _gate_shift,\
	}

static DEFINE_SPINLOCK(clk_out_lock);

static const char *clk_out1_parents[] = { "clk_m", "clk_m_div2",
	"clk_m_div4", "extern1",
};

static const char *clk_out2_parents[] = { "clk_m", "clk_m_div2",
	"clk_m_div4", "extern2",
};

static const char *clk_out3_parents[] = { "clk_m", "clk_m_div2",
	"clk_m_div4", "extern3",
};

static struct pmc_clk_init_data pmc_clks[] = {
	PMC_CLK(1, 6, 2),
	PMC_CLK(2, 14, 10),
	PMC_CLK(3, 22, 18),
};

void __init tegra_pmc_clk_init(void __iomem *pmc_base,
				struct tegra_clk *tegra_clks)
{
	struct clk *clk;
	struct clk **dt_clk;
	int i;

	for (i = 0; i < ARRAY_SIZE(pmc_clks); i++) {
		struct pmc_clk_init_data *data;

		data = pmc_clks + i;

		dt_clk = tegra_lookup_dt_id(data->mux_id, tegra_clks);
		if (!dt_clk)
			continue;

		clk = clk_register_mux(NULL, data->mux_name, data->parents,
				data->num_parents, CLK_SET_RATE_NO_REPARENT,
				pmc_base + PMC_CLK_OUT_CNTRL, data->mux_shift,
				3, 0, &clk_out_lock);
		*dt_clk = clk;


		dt_clk = tegra_lookup_dt_id(data->gate_id, tegra_clks);
		if (!dt_clk)
			continue;

		clk = clk_register_gate(NULL, data->gate_name, data->mux_name,
					0, pmc_base + PMC_CLK_OUT_CNTRL,
					data->gate_shift, 0, &clk_out_lock);
		*dt_clk = clk;
		clk_register_clkdev(clk, data->dev_name, data->gate_name);
	}

	/* blink */
	writel_relaxed(0, pmc_base + PMC_BLINK_TIMER);
	clk = clk_register_gate(NULL, "blink_override", "clk_32k", 0,
				pmc_base + PMC_DPD_PADS_ORIDE,
				PMC_DPD_PADS_ORIDE_BLINK_ENB, 0, NULL);

	dt_clk = tegra_lookup_dt_id(tegra_clk_blink, tegra_clks);
	if (!dt_clk)
		return;

	clk = clk_register_gate(NULL, "blink", "blink_override", 0,
				pmc_base + PMC_CTRL,
				PMC_CTRL_BLINK_ENB, 0, NULL);
	clk_register_clkdev(clk, "blink", NULL);
	*dt_clk = clk;
}