1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2014 MediaTek Inc.
4 * Author: James Liao <jamesjj.liao@mediatek.com>
5 */
6
7 #include <linux/of.h>
8 #include <linux/of_address.h>
9 #include <linux/err.h>
10 #include <linux/io.h>
11 #include <linux/slab.h>
12 #include <linux/delay.h>
13 #include <linux/clkdev.h>
14 #include <linux/module.h>
15 #include <linux/mfd/syscon.h>
16 #include <linux/device.h>
17 #include <linux/of_device.h>
18
19 #include "clk-mtk.h"
20 #include "clk-gate.h"
21
mtk_alloc_clk_data(unsigned int clk_num)22 struct clk_onecell_data *mtk_alloc_clk_data(unsigned int clk_num)
23 {
24 int i;
25 struct clk_onecell_data *clk_data;
26
27 clk_data = kzalloc(sizeof(*clk_data), GFP_KERNEL);
28 if (!clk_data)
29 return NULL;
30
31 clk_data->clks = kcalloc(clk_num, sizeof(*clk_data->clks), GFP_KERNEL);
32 if (!clk_data->clks)
33 goto err_out;
34
35 clk_data->clk_num = clk_num;
36
37 for (i = 0; i < clk_num; i++)
38 clk_data->clks[i] = ERR_PTR(-ENOENT);
39
40 return clk_data;
41 err_out:
42 kfree(clk_data);
43
44 return NULL;
45 }
46 EXPORT_SYMBOL_GPL(mtk_alloc_clk_data);
47
mtk_clk_register_fixed_clks(const struct mtk_fixed_clk * clks,int num,struct clk_onecell_data * clk_data)48 void mtk_clk_register_fixed_clks(const struct mtk_fixed_clk *clks,
49 int num, struct clk_onecell_data *clk_data)
50 {
51 int i;
52 struct clk *clk;
53
54 for (i = 0; i < num; i++) {
55 const struct mtk_fixed_clk *rc = &clks[i];
56
57 if (clk_data && !IS_ERR_OR_NULL(clk_data->clks[rc->id]))
58 continue;
59
60 clk = clk_register_fixed_rate(NULL, rc->name, rc->parent, 0,
61 rc->rate);
62
63 if (IS_ERR(clk)) {
64 pr_err("Failed to register clk %s: %ld\n",
65 rc->name, PTR_ERR(clk));
66 continue;
67 }
68
69 if (clk_data)
70 clk_data->clks[rc->id] = clk;
71 }
72 }
73 EXPORT_SYMBOL_GPL(mtk_clk_register_fixed_clks);
74
mtk_clk_register_factors(const struct mtk_fixed_factor * clks,int num,struct clk_onecell_data * clk_data)75 void mtk_clk_register_factors(const struct mtk_fixed_factor *clks,
76 int num, struct clk_onecell_data *clk_data)
77 {
78 int i;
79 struct clk *clk;
80
81 for (i = 0; i < num; i++) {
82 const struct mtk_fixed_factor *ff = &clks[i];
83
84 if (clk_data && !IS_ERR_OR_NULL(clk_data->clks[ff->id]))
85 continue;
86
87 clk = clk_register_fixed_factor(NULL, ff->name, ff->parent_name,
88 CLK_SET_RATE_PARENT, ff->mult, ff->div);
89
90 if (IS_ERR(clk)) {
91 pr_err("Failed to register clk %s: %ld\n",
92 ff->name, PTR_ERR(clk));
93 continue;
94 }
95
96 if (clk_data)
97 clk_data->clks[ff->id] = clk;
98 }
99 }
100 EXPORT_SYMBOL_GPL(mtk_clk_register_factors);
101
mtk_clk_register_gates_with_dev(struct device_node * node,const struct mtk_gate * clks,int num,struct clk_onecell_data * clk_data,struct device * dev)102 int mtk_clk_register_gates_with_dev(struct device_node *node,
103 const struct mtk_gate *clks,
104 int num, struct clk_onecell_data *clk_data,
105 struct device *dev)
106 {
107 int i;
108 struct clk *clk;
109 struct regmap *regmap;
110
111 if (!clk_data)
112 return -ENOMEM;
113
114 regmap = device_node_to_regmap(node);
115 if (IS_ERR(regmap)) {
116 pr_err("Cannot find regmap for %pOF: %ld\n", node,
117 PTR_ERR(regmap));
118 return PTR_ERR(regmap);
119 }
120
121 for (i = 0; i < num; i++) {
122 const struct mtk_gate *gate = &clks[i];
123
124 if (!IS_ERR_OR_NULL(clk_data->clks[gate->id]))
125 continue;
126
127 clk = mtk_clk_register_gate(gate->name, gate->parent_name,
128 regmap,
129 gate->regs->set_ofs,
130 gate->regs->clr_ofs,
131 gate->regs->sta_ofs,
132 gate->shift, gate->ops, gate->flags, dev);
133
134 if (IS_ERR(clk)) {
135 pr_err("Failed to register clk %s: %ld\n",
136 gate->name, PTR_ERR(clk));
137 continue;
138 }
139
140 clk_data->clks[gate->id] = clk;
141 }
142
143 return 0;
144 }
145
mtk_clk_register_gates(struct device_node * node,const struct mtk_gate * clks,int num,struct clk_onecell_data * clk_data)146 int mtk_clk_register_gates(struct device_node *node,
147 const struct mtk_gate *clks,
148 int num, struct clk_onecell_data *clk_data)
149 {
150 return mtk_clk_register_gates_with_dev(node,
151 clks, num, clk_data, NULL);
152 }
153 EXPORT_SYMBOL_GPL(mtk_clk_register_gates);
154
mtk_clk_register_composite(const struct mtk_composite * mc,void __iomem * base,spinlock_t * lock)155 struct clk *mtk_clk_register_composite(const struct mtk_composite *mc,
156 void __iomem *base, spinlock_t *lock)
157 {
158 struct clk *clk;
159 struct clk_mux *mux = NULL;
160 struct clk_gate *gate = NULL;
161 struct clk_divider *div = NULL;
162 struct clk_hw *mux_hw = NULL, *gate_hw = NULL, *div_hw = NULL;
163 const struct clk_ops *mux_ops = NULL, *gate_ops = NULL, *div_ops = NULL;
164 const char * const *parent_names;
165 const char *parent;
166 int num_parents;
167 int ret;
168
169 if (mc->mux_shift >= 0) {
170 mux = kzalloc(sizeof(*mux), GFP_KERNEL);
171 if (!mux)
172 return ERR_PTR(-ENOMEM);
173
174 mux->reg = base + mc->mux_reg;
175 mux->mask = BIT(mc->mux_width) - 1;
176 mux->shift = mc->mux_shift;
177 mux->lock = lock;
178 mux->flags = mc->mux_flags;
179 mux_hw = &mux->hw;
180 mux_ops = &clk_mux_ops;
181
182 parent_names = mc->parent_names;
183 num_parents = mc->num_parents;
184 } else {
185 parent = mc->parent;
186 parent_names = &parent;
187 num_parents = 1;
188 }
189
190 if (mc->gate_shift >= 0) {
191 gate = kzalloc(sizeof(*gate), GFP_KERNEL);
192 if (!gate) {
193 ret = -ENOMEM;
194 goto err_out;
195 }
196
197 gate->reg = base + mc->gate_reg;
198 gate->bit_idx = mc->gate_shift;
199 gate->flags = CLK_GATE_SET_TO_DISABLE;
200 gate->lock = lock;
201
202 gate_hw = &gate->hw;
203 gate_ops = &clk_gate_ops;
204 }
205
206 if (mc->divider_shift >= 0) {
207 div = kzalloc(sizeof(*div), GFP_KERNEL);
208 if (!div) {
209 ret = -ENOMEM;
210 goto err_out;
211 }
212
213 div->reg = base + mc->divider_reg;
214 div->shift = mc->divider_shift;
215 div->width = mc->divider_width;
216 div->lock = lock;
217
218 div_hw = &div->hw;
219 div_ops = &clk_divider_ops;
220 }
221
222 clk = clk_register_composite(NULL, mc->name, parent_names, num_parents,
223 mux_hw, mux_ops,
224 div_hw, div_ops,
225 gate_hw, gate_ops,
226 mc->flags);
227
228 if (IS_ERR(clk)) {
229 ret = PTR_ERR(clk);
230 goto err_out;
231 }
232
233 return clk;
234 err_out:
235 kfree(div);
236 kfree(gate);
237 kfree(mux);
238
239 return ERR_PTR(ret);
240 }
241
mtk_clk_register_composites(const struct mtk_composite * mcs,int num,void __iomem * base,spinlock_t * lock,struct clk_onecell_data * clk_data)242 void mtk_clk_register_composites(const struct mtk_composite *mcs,
243 int num, void __iomem *base, spinlock_t *lock,
244 struct clk_onecell_data *clk_data)
245 {
246 struct clk *clk;
247 int i;
248
249 for (i = 0; i < num; i++) {
250 const struct mtk_composite *mc = &mcs[i];
251
252 if (clk_data && !IS_ERR_OR_NULL(clk_data->clks[mc->id]))
253 continue;
254
255 clk = mtk_clk_register_composite(mc, base, lock);
256
257 if (IS_ERR(clk)) {
258 pr_err("Failed to register clk %s: %ld\n",
259 mc->name, PTR_ERR(clk));
260 continue;
261 }
262
263 if (clk_data)
264 clk_data->clks[mc->id] = clk;
265 }
266 }
267 EXPORT_SYMBOL_GPL(mtk_clk_register_composites);
268
mtk_clk_register_dividers(const struct mtk_clk_divider * mcds,int num,void __iomem * base,spinlock_t * lock,struct clk_onecell_data * clk_data)269 void mtk_clk_register_dividers(const struct mtk_clk_divider *mcds,
270 int num, void __iomem *base, spinlock_t *lock,
271 struct clk_onecell_data *clk_data)
272 {
273 struct clk *clk;
274 int i;
275
276 for (i = 0; i < num; i++) {
277 const struct mtk_clk_divider *mcd = &mcds[i];
278
279 if (clk_data && !IS_ERR_OR_NULL(clk_data->clks[mcd->id]))
280 continue;
281
282 clk = clk_register_divider(NULL, mcd->name, mcd->parent_name,
283 mcd->flags, base + mcd->div_reg, mcd->div_shift,
284 mcd->div_width, mcd->clk_divider_flags, lock);
285
286 if (IS_ERR(clk)) {
287 pr_err("Failed to register clk %s: %ld\n",
288 mcd->name, PTR_ERR(clk));
289 continue;
290 }
291
292 if (clk_data)
293 clk_data->clks[mcd->id] = clk;
294 }
295 }
296
mtk_clk_simple_probe(struct platform_device * pdev)297 int mtk_clk_simple_probe(struct platform_device *pdev)
298 {
299 const struct mtk_clk_desc *mcd;
300 struct clk_onecell_data *clk_data;
301 struct device_node *node = pdev->dev.of_node;
302 int r;
303
304 mcd = of_device_get_match_data(&pdev->dev);
305 if (!mcd)
306 return -EINVAL;
307
308 clk_data = mtk_alloc_clk_data(mcd->num_clks);
309 if (!clk_data)
310 return -ENOMEM;
311
312 r = mtk_clk_register_gates(node, mcd->clks, mcd->num_clks, clk_data);
313 if (r)
314 return r;
315
316 return of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
317 }
318
319 MODULE_LICENSE("GPL");
320