tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2012, 2013, NVIDIA CORPORATION. All rights reserved.
4 */
5
6#include <linux/io.h>
7#include <linux/clk-provider.h>
8#include <linux/clkdev.h>
9#include <linux/of.h>
10#include <linux/of_address.h>
11#include <linux/delay.h>
12#include <linux/export.h>
13#include <linux/clk/tegra.h>
14
15#include "clk.h"
16#include "clk-id.h"
17
18#define PMC_CLK_OUT_CNTRL 0x1a8
19#define PMC_DPD_PADS_ORIDE 0x1c
20#define PMC_DPD_PADS_ORIDE_BLINK_ENB 20
21#define PMC_CTRL 0
22#define PMC_CTRL_BLINK_ENB 7
23#define PMC_BLINK_TIMER 0x40
24
25struct pmc_clk_init_data {
26 char *mux_name;
27 char *gate_name;
28 const char **parents;
29 int num_parents;
30 int mux_id;
31 int gate_id;
32 char *dev_name;
33 u8 mux_shift;
34 u8 gate_shift;
35};
36
37#define PMC_CLK(_num, _mux_shift, _gate_shift)\
38 {\
39 .mux_name = "clk_out_" #_num "_mux",\
40 .gate_name = "clk_out_" #_num,\
41 .parents = clk_out ##_num ##_parents,\
42 .num_parents = ARRAY_SIZE(clk_out ##_num ##_parents),\
43 .mux_id = tegra_clk_clk_out_ ##_num ##_mux,\
44 .gate_id = tegra_clk_clk_out_ ##_num,\
45 .dev_name = "extern" #_num,\
46 .mux_shift = _mux_shift,\
47 .gate_shift = _gate_shift,\
48 }
49
50static DEFINE_SPINLOCK(clk_out_lock);
51
52static const char *clk_out1_parents[] = { "clk_m", "clk_m_div2",
53 "clk_m_div4", "extern1",
54};
55
56static const char *clk_out2_parents[] = { "clk_m", "clk_m_div2",
57 "clk_m_div4", "extern2",
58};
59
60static const char *clk_out3_parents[] = { "clk_m", "clk_m_div2",
61 "clk_m_div4", "extern3",
62};
63
64static struct pmc_clk_init_data pmc_clks[] = {
65 PMC_CLK(1, 6, 2),
66 PMC_CLK(2, 14, 10),
67 PMC_CLK(3, 22, 18),
68};
69
70void __init tegra_pmc_clk_init(void __iomem *pmc_base,
71 struct tegra_clk *tegra_clks)
72{
73 struct clk *clk;
74 struct clk **dt_clk;
75 int i;
76
77 for (i = 0; i < ARRAY_SIZE(pmc_clks); i++) {
78 struct pmc_clk_init_data *data;
79
80 data = pmc_clks + i;
81
82 dt_clk = tegra_lookup_dt_id(data->mux_id, tegra_clks);
83 if (!dt_clk)
84 continue;
85
86 clk = clk_register_mux(NULL, data->mux_name, data->parents,
87 data->num_parents,
88 CLK_SET_RATE_NO_REPARENT | CLK_SET_RATE_PARENT,
89 pmc_base + PMC_CLK_OUT_CNTRL, data->mux_shift,
90 3, 0, &clk_out_lock);
91 *dt_clk = clk;
92
93
94 dt_clk = tegra_lookup_dt_id(data->gate_id, tegra_clks);
95 if (!dt_clk)
96 continue;
97
98 clk = clk_register_gate(NULL, data->gate_name, data->mux_name,
99 CLK_SET_RATE_PARENT,
100 pmc_base + PMC_CLK_OUT_CNTRL,
101 data->gate_shift, 0, &clk_out_lock);
102 *dt_clk = clk;
103 clk_register_clkdev(clk, data->dev_name, data->gate_name);
104 }
105
106 /* blink */
107 writel_relaxed(0, pmc_base + PMC_BLINK_TIMER);
108 clk = clk_register_gate(NULL, "blink_override", "clk_32k", 0,
109 pmc_base + PMC_DPD_PADS_ORIDE,
110 PMC_DPD_PADS_ORIDE_BLINK_ENB, 0, NULL);
111
112 dt_clk = tegra_lookup_dt_id(tegra_clk_blink, tegra_clks);
113 if (!dt_clk)
114 return;
115
116 clk = clk_register_gate(NULL, "blink", "blink_override", 0,
117 pmc_base + PMC_CTRL,
118 PMC_CTRL_BLINK_ENB, 0, NULL);
119 clk_register_clkdev(clk, "blink", NULL);
120 *dt_clk = clk;
121}
122