1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2017, Intel Corporation
4 */
5 #include <linux/slab.h>
6 #include <linux/clk-provider.h>
7 #include <linux/io.h>
8
9 #include "stratix10-clk.h"
10 #include "clk.h"
11
12 #define CLK_MGR_FREE_SHIFT 16
13 #define CLK_MGR_FREE_MASK 0x7
14 #define SWCTRLBTCLKSEN_SHIFT 8
15
16 #define to_periph_clk(p) container_of(p, struct socfpga_periph_clk, hw.hw)
17
clk_peri_c_clk_recalc_rate(struct clk_hw * hwclk,unsigned long parent_rate)18 static unsigned long clk_peri_c_clk_recalc_rate(struct clk_hw *hwclk,
19 unsigned long parent_rate)
20 {
21 struct socfpga_periph_clk *socfpgaclk = to_periph_clk(hwclk);
22 unsigned long div = 1;
23 u32 val;
24
25 val = readl(socfpgaclk->hw.reg);
26 val &= GENMASK(SWCTRLBTCLKSEN_SHIFT - 1, 0);
27 parent_rate /= val;
28
29 return parent_rate / div;
30 }
31
clk_peri_cnt_clk_recalc_rate(struct clk_hw * hwclk,unsigned long parent_rate)32 static unsigned long clk_peri_cnt_clk_recalc_rate(struct clk_hw *hwclk,
33 unsigned long parent_rate)
34 {
35 struct socfpga_periph_clk *socfpgaclk = to_periph_clk(hwclk);
36 unsigned long div = 1;
37
38 if (socfpgaclk->fixed_div) {
39 div = socfpgaclk->fixed_div;
40 } else {
41 if (socfpgaclk->hw.reg)
42 div = ((readl(socfpgaclk->hw.reg) & 0x7ff) + 1);
43 }
44
45 return parent_rate / div;
46 }
47
clk_periclk_get_parent(struct clk_hw * hwclk)48 static u8 clk_periclk_get_parent(struct clk_hw *hwclk)
49 {
50 struct socfpga_periph_clk *socfpgaclk = to_periph_clk(hwclk);
51 u32 clk_src, mask;
52 u8 parent = 0;
53
54 /* handle the bypass first */
55 if (socfpgaclk->bypass_reg) {
56 mask = (0x1 << socfpgaclk->bypass_shift);
57 parent = ((readl(socfpgaclk->bypass_reg) & mask) >>
58 socfpgaclk->bypass_shift);
59 if (parent)
60 return parent;
61 }
62
63 if (socfpgaclk->hw.reg) {
64 clk_src = readl(socfpgaclk->hw.reg);
65 parent = (clk_src >> CLK_MGR_FREE_SHIFT) &
66 CLK_MGR_FREE_MASK;
67 }
68 return parent;
69 }
70
71 static const struct clk_ops peri_c_clk_ops = {
72 .recalc_rate = clk_peri_c_clk_recalc_rate,
73 .get_parent = clk_periclk_get_parent,
74 };
75
76 static const struct clk_ops peri_cnt_clk_ops = {
77 .recalc_rate = clk_peri_cnt_clk_recalc_rate,
78 .get_parent = clk_periclk_get_parent,
79 };
80
s10_register_periph(const struct stratix10_perip_c_clock * clks,void __iomem * reg)81 struct clk *s10_register_periph(const struct stratix10_perip_c_clock *clks,
82 void __iomem *reg)
83 {
84 struct clk *clk;
85 struct socfpga_periph_clk *periph_clk;
86 struct clk_init_data init;
87 const char *name = clks->name;
88 const char *parent_name = clks->parent_name;
89
90 periph_clk = kzalloc(sizeof(*periph_clk), GFP_KERNEL);
91 if (WARN_ON(!periph_clk))
92 return NULL;
93
94 periph_clk->hw.reg = reg + clks->offset;
95
96 init.name = name;
97 init.ops = &peri_c_clk_ops;
98 init.flags = clks->flags;
99
100 init.num_parents = clks->num_parents;
101 init.parent_names = parent_name ? &parent_name : NULL;
102 if (init.parent_names == NULL)
103 init.parent_data = clks->parent_data;
104
105 periph_clk->hw.hw.init = &init;
106
107 clk = clk_register(NULL, &periph_clk->hw.hw);
108 if (WARN_ON(IS_ERR(clk))) {
109 kfree(periph_clk);
110 return NULL;
111 }
112 return clk;
113 }
114
s10_register_cnt_periph(const struct stratix10_perip_cnt_clock * clks,void __iomem * regbase)115 struct clk *s10_register_cnt_periph(const struct stratix10_perip_cnt_clock *clks,
116 void __iomem *regbase)
117 {
118 struct clk *clk;
119 struct socfpga_periph_clk *periph_clk;
120 struct clk_init_data init;
121 const char *name = clks->name;
122 const char *parent_name = clks->parent_name;
123
124 periph_clk = kzalloc(sizeof(*periph_clk), GFP_KERNEL);
125 if (WARN_ON(!periph_clk))
126 return NULL;
127
128 if (clks->offset)
129 periph_clk->hw.reg = regbase + clks->offset;
130 else
131 periph_clk->hw.reg = NULL;
132
133 if (clks->bypass_reg)
134 periph_clk->bypass_reg = regbase + clks->bypass_reg;
135 else
136 periph_clk->bypass_reg = NULL;
137 periph_clk->bypass_shift = clks->bypass_shift;
138 periph_clk->fixed_div = clks->fixed_divider;
139
140 init.name = name;
141 init.ops = &peri_cnt_clk_ops;
142 init.flags = clks->flags;
143
144 init.num_parents = clks->num_parents;
145 init.parent_names = parent_name ? &parent_name : NULL;
146 if (init.parent_names == NULL)
147 init.parent_data = clks->parent_data;
148
149 periph_clk->hw.hw.init = &init;
150
151 clk = clk_register(NULL, &periph_clk->hw.hw);
152 if (WARN_ON(IS_ERR(clk))) {
153 kfree(periph_clk);
154 return NULL;
155 }
156 return clk;
157 }
158