Gitiles
Code Review Sign In
review.shift-gmbh.com / SHIFTPHONES / mainline / linux / a254a9da455c171441ab3a76ed8f5d1e9412e15f / . / drivers / mmc / host / meson-mx-sdhc-clkc.c
blob: 19200b7079a68b0ea75bec9684a0cee3b375d21e [file] [log] [blame]
Martin Blumenstingle4bf1b02020-05-12 22:41:47 +0200[diff] [blame]1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Amlogic Meson SDHC clock controller
4 *
5 * Copyright (C) 2020 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
6 */
7
8#include <linux/clk.h>
9#include <linux/clk-provider.h>
10#include <linux/device.h>
11#include <linux/platform_device.h>
12
13#include "meson-mx-sdhc.h"
14
Martin Blumenstingle4bf1b02020-05-12 22:41:47 +0200[diff] [blame]15struct meson_mx_sdhc_clkc {
16 struct clk_mux src_sel;
17 struct clk_divider div;
18 struct clk_gate mod_clk_en;
19 struct clk_gate tx_clk_en;
20 struct clk_gate rx_clk_en;
21 struct clk_gate sd_clk_en;
22};
23
24static const struct clk_parent_data meson_mx_sdhc_src_sel_parents[4] = {
25 { .fw_name = "clkin0" },
26 { .fw_name = "clkin1" },
27 { .fw_name = "clkin2" },
28 { .fw_name = "clkin3" },
29};
30
31static const struct clk_div_table meson_mx_sdhc_div_table[] = {
32 { .div = 6, .val = 5, },
33 { .div = 8, .val = 7, },
34 { .div = 9, .val = 8, },
35 { .div = 10, .val = 9, },
36 { .div = 12, .val = 11, },
37 { .div = 16, .val = 15, },
38 { .div = 18, .val = 17, },
39 { .div = 34, .val = 33, },
40 { .div = 142, .val = 141, },
41 { .div = 850, .val = 849, },
42 { .div = 2126, .val = 2125, },
43 { .div = 4096, .val = 4095, },
44 { /* sentinel */ }
45};
46
47static int meson_mx_sdhc_clk_hw_register(struct device *dev,
48 const char *name_suffix,
49 const struct clk_parent_data *parents,
50 unsigned int num_parents,
51 const struct clk_ops *ops,
52 struct clk_hw *hw)
53{
Martin Blumenstingl7d797352020-05-18 00:29:07 +0200[diff] [blame]54 struct clk_init_data init = { };
Martin Blumenstingle4bf1b02020-05-12 22:41:47 +0200[diff] [blame]55 char clk_name[32];
56
57 snprintf(clk_name, sizeof(clk_name), "%s#%s", dev_name(dev),
58 name_suffix);
59
60 init.name = clk_name;
61 init.ops = ops;
62 init.flags = CLK_SET_RATE_PARENT;
63 init.parent_data = parents;
64 init.num_parents = num_parents;
65
66 hw->init = &init;
67
68 return devm_clk_hw_register(dev, hw);
69}
70
71static int meson_mx_sdhc_gate_clk_hw_register(struct device *dev,
72 const char *name_suffix,
73 struct clk_hw *parent,
74 struct clk_hw *hw)
75{
76 struct clk_parent_data parent_data = { .hw = parent };
77
78 return meson_mx_sdhc_clk_hw_register(dev, name_suffix, &parent_data, 1,
79 &clk_gate_ops, hw);
80}
81
82int meson_mx_sdhc_register_clkc(struct device *dev, void __iomem *base,
83 struct clk_bulk_data *clk_bulk_data)
84{
Martin Blumenstingl7d797352020-05-18 00:29:07 +0200[diff] [blame]85 struct clk_parent_data div_parent = { };
Martin Blumenstingle4bf1b02020-05-12 22:41:47 +0200[diff] [blame]86 struct meson_mx_sdhc_clkc *clkc_data;
87 int ret;
88
89 clkc_data = devm_kzalloc(dev, sizeof(*clkc_data), GFP_KERNEL);
90 if (!clkc_data)
91 return -ENOMEM;
92
93 clkc_data->src_sel.reg = base + MESON_SDHC_CLKC;
94 clkc_data->src_sel.mask = 0x3;
95 clkc_data->src_sel.shift = 16;
96 ret = meson_mx_sdhc_clk_hw_register(dev, "src_sel",
97 meson_mx_sdhc_src_sel_parents, 4,
98 &clk_mux_ops,
99 &clkc_data->src_sel.hw);
100 if (ret)
101 return ret;
102
103 clkc_data->div.reg = base + MESON_SDHC_CLKC;
104 clkc_data->div.shift = 0;
105 clkc_data->div.width = 12;
106 clkc_data->div.table = meson_mx_sdhc_div_table;
107 div_parent.hw = &clkc_data->src_sel.hw;
108 ret = meson_mx_sdhc_clk_hw_register(dev, "div", &div_parent, 1,
109 &clk_divider_ops,
110 &clkc_data->div.hw);
111 if (ret)
112 return ret;
113
114 clkc_data->mod_clk_en.reg = base + MESON_SDHC_CLKC;
115 clkc_data->mod_clk_en.bit_idx = 15;
116 ret = meson_mx_sdhc_gate_clk_hw_register(dev, "mod_clk_on",
117 &clkc_data->div.hw,
118 &clkc_data->mod_clk_en.hw);
119 if (ret)
120 return ret;
121
122 clkc_data->tx_clk_en.reg = base + MESON_SDHC_CLKC;
123 clkc_data->tx_clk_en.bit_idx = 14;
124 ret = meson_mx_sdhc_gate_clk_hw_register(dev, "tx_clk_on",
125 &clkc_data->div.hw,
126 &clkc_data->tx_clk_en.hw);
127 if (ret)
128 return ret;
129
130 clkc_data->rx_clk_en.reg = base + MESON_SDHC_CLKC;
131 clkc_data->rx_clk_en.bit_idx = 13;
132 ret = meson_mx_sdhc_gate_clk_hw_register(dev, "rx_clk_on",
133 &clkc_data->div.hw,
134 &clkc_data->rx_clk_en.hw);
135 if (ret)
136 return ret;
137
138 clkc_data->sd_clk_en.reg = base + MESON_SDHC_CLKC;
139 clkc_data->sd_clk_en.bit_idx = 12;
140 ret = meson_mx_sdhc_gate_clk_hw_register(dev, "sd_clk_on",
141 &clkc_data->div.hw,
142 &clkc_data->sd_clk_en.hw);
143 if (ret)
144 return ret;
145
146 /*
147 * TODO: Replace clk_hw.clk with devm_clk_hw_get_clk() once that is
148 * available.
149 */
150 clk_bulk_data[0].clk = clkc_data->mod_clk_en.hw.clk;
151 clk_bulk_data[1].clk = clkc_data->sd_clk_en.hw.clk;
152 clk_bulk_data[2].clk = clkc_data->tx_clk_en.hw.clk;
153 clk_bulk_data[3].clk = clkc_data->rx_clk_en.hw.clk;
154
155 return 0;
156}