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
n5x_clk_peri_c_clk_recalc_rate(struct clk_hw * hwclk,unsigned long parent_rate)18 static unsigned long n5x_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;
23 unsigned long shift = socfpgaclk->shift;
24 u32 val;
25
26 val = readl(socfpgaclk->hw.reg);
27 val &= (0x1f << shift);
28 div = (val >> shift) + 1;
29
30 return parent_rate / div;
31 }
32
clk_peri_c_clk_recalc_rate(struct clk_hw * hwclk,unsigned long parent_rate)33 static unsigned long clk_peri_c_clk_recalc_rate(struct clk_hw *hwclk,
34 unsigned long parent_rate)
35 {
36 struct socfpga_periph_clk *socfpgaclk = to_periph_clk(hwclk);
37 unsigned long div = 1;
38 u32 val;
39
40 val = readl(socfpgaclk->hw.reg);
41 val &= GENMASK(SWCTRLBTCLKSEN_SHIFT - 1, 0);
42 parent_rate /= val;
43
44 return parent_rate / div;
45 }
46
clk_peri_cnt_clk_recalc_rate(struct clk_hw * hwclk,unsigned long parent_rate)47 static unsigned long clk_peri_cnt_clk_recalc_rate(struct clk_hw *hwclk,
48 unsigned long parent_rate)
49 {
50 struct socfpga_periph_clk *socfpgaclk = to_periph_clk(hwclk);
51 unsigned long div = 1;
52
53 if (socfpgaclk->fixed_div) {
54 div = socfpgaclk->fixed_div;
55 } else {
56 if (socfpgaclk->hw.reg)
57 div = ((readl(socfpgaclk->hw.reg) & 0x7ff) + 1);
58 }
59
60 return parent_rate / div;
61 }
62
clk_periclk_get_parent(struct clk_hw * hwclk)63 static u8 clk_periclk_get_parent(struct clk_hw *hwclk)
64 {
65 struct socfpga_periph_clk *socfpgaclk = to_periph_clk(hwclk);
66 u32 clk_src, mask;
67 u8 parent = 0;
68
69 /* handle the bypass first */
70 if (socfpgaclk->bypass_reg) {
71 mask = (0x1 << socfpgaclk->bypass_shift);
72 parent = ((readl(socfpgaclk->bypass_reg) & mask) >>
73 socfpgaclk->bypass_shift);
74 if (parent)
75 return parent;
76 }
77
78 if (socfpgaclk->hw.reg) {
79 clk_src = readl(socfpgaclk->hw.reg);
80 parent = (clk_src >> CLK_MGR_FREE_SHIFT) &
81 CLK_MGR_FREE_MASK;
82 }
83 return parent;
84 }
85
86 static const struct clk_ops n5x_peri_c_clk_ops = {
87 .recalc_rate = n5x_clk_peri_c_clk_recalc_rate,
88 .get_parent = clk_periclk_get_parent,
89 };
90
91 static const struct clk_ops peri_c_clk_ops = {
92 .recalc_rate = clk_peri_c_clk_recalc_rate,
93 .get_parent = clk_periclk_get_parent,
94 };
95
96 static const struct clk_ops peri_cnt_clk_ops = {
97 .recalc_rate = clk_peri_cnt_clk_recalc_rate,
98 .get_parent = clk_periclk_get_parent,
99 };
100
s10_register_periph(const struct stratix10_perip_c_clock * clks,void __iomem * reg)101 struct clk_hw *s10_register_periph(const struct stratix10_perip_c_clock *clks,
102 void __iomem *reg)
103 {
104 struct clk_hw *hw_clk;
105 struct socfpga_periph_clk *periph_clk;
106 struct clk_init_data init;
107 const char *name = clks->name;
108 const char *parent_name = clks->parent_name;
109 int ret;
110
111 periph_clk = kzalloc(sizeof(*periph_clk), GFP_KERNEL);
112 if (WARN_ON(!periph_clk))
113 return NULL;
114
115 periph_clk->hw.reg = reg + clks->offset;
116
117 init.name = name;
118 init.ops = &peri_c_clk_ops;
119 init.flags = clks->flags;
120
121 init.num_parents = clks->num_parents;
122 init.parent_names = parent_name ? &parent_name : NULL;
123 if (init.parent_names == NULL)
124 init.parent_data = clks->parent_data;
125
126 periph_clk->hw.hw.init = &init;
127 hw_clk = &periph_clk->hw.hw;
128
129 ret = clk_hw_register(NULL, hw_clk);
130 if (ret) {
131 kfree(periph_clk);
132 return ERR_PTR(ret);
133 }
134 return hw_clk;
135 }
136
n5x_register_periph(const struct n5x_perip_c_clock * clks,void __iomem * regbase)137 struct clk_hw *n5x_register_periph(const struct n5x_perip_c_clock *clks,
138 void __iomem *regbase)
139 {
140 struct clk_hw *hw_clk;
141 struct socfpga_periph_clk *periph_clk;
142 struct clk_init_data init;
143 const char *name = clks->name;
144 const char *parent_name = clks->parent_name;
145 int ret;
146
147 periph_clk = kzalloc(sizeof(*periph_clk), GFP_KERNEL);
148 if (WARN_ON(!periph_clk))
149 return NULL;
150
151 periph_clk->hw.reg = regbase + clks->offset;
152 periph_clk->shift = clks->shift;
153
154 init.name = name;
155 init.ops = &n5x_peri_c_clk_ops;
156 init.flags = clks->flags;
157
158 init.num_parents = clks->num_parents;
159 init.parent_names = parent_name ? &parent_name : NULL;
160
161 periph_clk->hw.hw.init = &init;
162 hw_clk = &periph_clk->hw.hw;
163
164 ret = clk_hw_register(NULL, hw_clk);
165 if (ret) {
166 kfree(periph_clk);
167 return ERR_PTR(ret);
168 }
169 return hw_clk;
170 }
171
s10_register_cnt_periph(const struct stratix10_perip_cnt_clock * clks,void __iomem * regbase)172 struct clk_hw *s10_register_cnt_periph(const struct stratix10_perip_cnt_clock *clks,
173 void __iomem *regbase)
174 {
175 struct clk_hw *hw_clk;
176 struct socfpga_periph_clk *periph_clk;
177 struct clk_init_data init;
178 const char *name = clks->name;
179 const char *parent_name = clks->parent_name;
180 int ret;
181
182 periph_clk = kzalloc(sizeof(*periph_clk), GFP_KERNEL);
183 if (WARN_ON(!periph_clk))
184 return NULL;
185
186 if (clks->offset)
187 periph_clk->hw.reg = regbase + clks->offset;
188 else
189 periph_clk->hw.reg = NULL;
190
191 if (clks->bypass_reg)
192 periph_clk->bypass_reg = regbase + clks->bypass_reg;
193 else
194 periph_clk->bypass_reg = NULL;
195 periph_clk->bypass_shift = clks->bypass_shift;
196 periph_clk->fixed_div = clks->fixed_divider;
197
198 init.name = name;
199 init.ops = &peri_cnt_clk_ops;
200 init.flags = clks->flags;
201
202 init.num_parents = clks->num_parents;
203 init.parent_names = parent_name ? &parent_name : NULL;
204 if (init.parent_names == NULL)
205 init.parent_data = clks->parent_data;
206
207 periph_clk->hw.hw.init = &init;
208 hw_clk = &periph_clk->hw.hw;
209
210 ret = clk_hw_register(NULL, hw_clk);
211 if (ret) {
212 kfree(periph_clk);
213 return ERR_PTR(ret);
214 }
215 return hw_clk;
216 }
217