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11#include <linux/slab.h>
12#include <linux/clkdev.h>
13#include <linux/clk.h>
14#include <linux/clk-provider.h>
15#include <linux/io.h>
16#include <linux/of_address.h>
17#include <linux/syscore_ops.h>
18
19#include "clk.h"
20
21static LIST_HEAD(clock_reg_cache_list);
22
23void samsung_clk_save(void __iomem *base,
24 struct samsung_clk_reg_dump *rd,
25 unsigned int num_regs)
26{
27 for (; num_regs > 0; --num_regs, ++rd)
28 rd->value = readl(base + rd->offset);
29}
30
31void samsung_clk_restore(void __iomem *base,
32 const struct samsung_clk_reg_dump *rd,
33 unsigned int num_regs)
34{
35 for (; num_regs > 0; --num_regs, ++rd)
36 writel(rd->value, base + rd->offset);
37}
38
39struct samsung_clk_reg_dump *samsung_clk_alloc_reg_dump(
40 const unsigned long *rdump,
41 unsigned long nr_rdump)
42{
43 struct samsung_clk_reg_dump *rd;
44 unsigned int i;
45
46 rd = kcalloc(nr_rdump, sizeof(*rd), GFP_KERNEL);
47 if (!rd)
48 return NULL;
49
50 for (i = 0; i < nr_rdump; ++i)
51 rd[i].offset = rdump[i];
52
53 return rd;
54}
55
56
57struct samsung_clk_provider *__init samsung_clk_init(struct device_node *np,
58 void __iomem *base, unsigned long nr_clks)
59{
60 struct samsung_clk_provider *ctx;
61 int i;
62
63 ctx = kzalloc(struct_size(ctx, clk_data.hws, nr_clks), GFP_KERNEL);
64 if (!ctx)
65 panic("could not allocate clock provider context.\n");
66
67 for (i = 0; i < nr_clks; ++i)
68 ctx->clk_data.hws[i] = ERR_PTR(-ENOENT);
69
70 ctx->reg_base = base;
71 ctx->clk_data.num = nr_clks;
72 spin_lock_init(&ctx->lock);
73
74 return ctx;
75}
76
77void __init samsung_clk_of_add_provider(struct device_node *np,
78 struct samsung_clk_provider *ctx)
79{
80 if (np) {
81 if (of_clk_add_hw_provider(np, of_clk_hw_onecell_get,
82 &ctx->clk_data))
83 panic("could not register clk provider\n");
84 }
85}
86
87
88void samsung_clk_add_lookup(struct samsung_clk_provider *ctx,
89 struct clk_hw *clk_hw, unsigned int id)
90{
91 if (id)
92 ctx->clk_data.hws[id] = clk_hw;
93}
94
95
96void __init samsung_clk_register_alias(struct samsung_clk_provider *ctx,
97 const struct samsung_clock_alias *list,
98 unsigned int nr_clk)
99{
100 struct clk_hw *clk_hw;
101 unsigned int idx, ret;
102
103 for (idx = 0; idx < nr_clk; idx++, list++) {
104 if (!list->id) {
105 pr_err("%s: clock id missing for index %d\n", __func__,
106 idx);
107 continue;
108 }
109
110 clk_hw = ctx->clk_data.hws[list->id];
111 if (!clk_hw) {
112 pr_err("%s: failed to find clock %d\n", __func__,
113 list->id);
114 continue;
115 }
116
117 ret = clk_hw_register_clkdev(clk_hw, list->alias,
118 list->dev_name);
119 if (ret)
120 pr_err("%s: failed to register lookup %s\n",
121 __func__, list->alias);
122 }
123}
124
125
126void __init samsung_clk_register_fixed_rate(struct samsung_clk_provider *ctx,
127 const struct samsung_fixed_rate_clock *list,
128 unsigned int nr_clk)
129{
130 struct clk_hw *clk_hw;
131 unsigned int idx, ret;
132
133 for (idx = 0; idx < nr_clk; idx++, list++) {
134 clk_hw = clk_hw_register_fixed_rate(ctx->dev, list->name,
135 list->parent_name, list->flags, list->fixed_rate);
136 if (IS_ERR(clk_hw)) {
137 pr_err("%s: failed to register clock %s\n", __func__,
138 list->name);
139 continue;
140 }
141
142 samsung_clk_add_lookup(ctx, clk_hw, list->id);
143
144
145
146
147
148 ret = clk_hw_register_clkdev(clk_hw, list->name, NULL);
149 if (ret)
150 pr_err("%s: failed to register clock lookup for %s",
151 __func__, list->name);
152 }
153}
154
155
156void __init samsung_clk_register_fixed_factor(struct samsung_clk_provider *ctx,
157 const struct samsung_fixed_factor_clock *list, unsigned int nr_clk)
158{
159 struct clk_hw *clk_hw;
160 unsigned int idx;
161
162 for (idx = 0; idx < nr_clk; idx++, list++) {
163 clk_hw = clk_hw_register_fixed_factor(ctx->dev, list->name,
164 list->parent_name, list->flags, list->mult, list->div);
165 if (IS_ERR(clk_hw)) {
166 pr_err("%s: failed to register clock %s\n", __func__,
167 list->name);
168 continue;
169 }
170
171 samsung_clk_add_lookup(ctx, clk_hw, list->id);
172 }
173}
174
175
176void __init samsung_clk_register_mux(struct samsung_clk_provider *ctx,
177 const struct samsung_mux_clock *list,
178 unsigned int nr_clk)
179{
180 struct clk_hw *clk_hw;
181 unsigned int idx;
182
183 for (idx = 0; idx < nr_clk; idx++, list++) {
184 clk_hw = clk_hw_register_mux(ctx->dev, list->name,
185 list->parent_names, list->num_parents, list->flags,
186 ctx->reg_base + list->offset,
187 list->shift, list->width, list->mux_flags, &ctx->lock);
188 if (IS_ERR(clk_hw)) {
189 pr_err("%s: failed to register clock %s\n", __func__,
190 list->name);
191 continue;
192 }
193
194 samsung_clk_add_lookup(ctx, clk_hw, list->id);
195 }
196}
197
198
199void __init samsung_clk_register_div(struct samsung_clk_provider *ctx,
200 const struct samsung_div_clock *list,
201 unsigned int nr_clk)
202{
203 struct clk_hw *clk_hw;
204 unsigned int idx;
205
206 for (idx = 0; idx < nr_clk; idx++, list++) {
207 if (list->table)
208 clk_hw = clk_hw_register_divider_table(ctx->dev,
209 list->name, list->parent_name, list->flags,
210 ctx->reg_base + list->offset,
211 list->shift, list->width, list->div_flags,
212 list->table, &ctx->lock);
213 else
214 clk_hw = clk_hw_register_divider(ctx->dev, list->name,
215 list->parent_name, list->flags,
216 ctx->reg_base + list->offset, list->shift,
217 list->width, list->div_flags, &ctx->lock);
218 if (IS_ERR(clk_hw)) {
219 pr_err("%s: failed to register clock %s\n", __func__,
220 list->name);
221 continue;
222 }
223
224 samsung_clk_add_lookup(ctx, clk_hw, list->id);
225 }
226}
227
228
229void __init samsung_clk_register_gate(struct samsung_clk_provider *ctx,
230 const struct samsung_gate_clock *list,
231 unsigned int nr_clk)
232{
233 struct clk_hw *clk_hw;
234 unsigned int idx;
235
236 for (idx = 0; idx < nr_clk; idx++, list++) {
237 clk_hw = clk_hw_register_gate(ctx->dev, list->name, list->parent_name,
238 list->flags, ctx->reg_base + list->offset,
239 list->bit_idx, list->gate_flags, &ctx->lock);
240 if (IS_ERR(clk_hw)) {
241 pr_err("%s: failed to register clock %s\n", __func__,
242 list->name);
243 continue;
244 }
245
246 samsung_clk_add_lookup(ctx, clk_hw, list->id);
247 }
248}
249
250
251
252
253
254void __init samsung_clk_of_register_fixed_ext(struct samsung_clk_provider *ctx,
255 struct samsung_fixed_rate_clock *fixed_rate_clk,
256 unsigned int nr_fixed_rate_clk,
257 const struct of_device_id *clk_matches)
258{
259 const struct of_device_id *match;
260 struct device_node *clk_np;
261 u32 freq;
262
263 for_each_matching_node_and_match(clk_np, clk_matches, &match) {
264 if (of_property_read_u32(clk_np, "clock-frequency", &freq))
265 continue;
266 fixed_rate_clk[(unsigned long)match->data].fixed_rate = freq;
267 }
268 samsung_clk_register_fixed_rate(ctx, fixed_rate_clk, nr_fixed_rate_clk);
269}
270
271
272unsigned long _get_rate(const char *clk_name)
273{
274 struct clk *clk;
275
276 clk = __clk_lookup(clk_name);
277 if (!clk) {
278 pr_err("%s: could not find clock %s\n", __func__, clk_name);
279 return 0;
280 }
281
282 return clk_get_rate(clk);
283}
284
285#ifdef CONFIG_PM_SLEEP
286static int samsung_clk_suspend(void)
287{
288 struct samsung_clock_reg_cache *reg_cache;
289
290 list_for_each_entry(reg_cache, &clock_reg_cache_list, node) {
291 samsung_clk_save(reg_cache->reg_base, reg_cache->rdump,
292 reg_cache->rd_num);
293 samsung_clk_restore(reg_cache->reg_base, reg_cache->rsuspend,
294 reg_cache->rsuspend_num);
295 }
296 return 0;
297}
298
299static void samsung_clk_resume(void)
300{
301 struct samsung_clock_reg_cache *reg_cache;
302
303 list_for_each_entry(reg_cache, &clock_reg_cache_list, node)
304 samsung_clk_restore(reg_cache->reg_base, reg_cache->rdump,
305 reg_cache->rd_num);
306}
307
308static struct syscore_ops samsung_clk_syscore_ops = {
309 .suspend = samsung_clk_suspend,
310 .resume = samsung_clk_resume,
311};
312
313void samsung_clk_extended_sleep_init(void __iomem *reg_base,
314 const unsigned long *rdump,
315 unsigned long nr_rdump,
316 const struct samsung_clk_reg_dump *rsuspend,
317 unsigned long nr_rsuspend)
318{
319 struct samsung_clock_reg_cache *reg_cache;
320
321 reg_cache = kzalloc(sizeof(struct samsung_clock_reg_cache),
322 GFP_KERNEL);
323 if (!reg_cache)
324 panic("could not allocate register reg_cache.\n");
325 reg_cache->rdump = samsung_clk_alloc_reg_dump(rdump, nr_rdump);
326
327 if (!reg_cache->rdump)
328 panic("could not allocate register dump storage.\n");
329
330 if (list_empty(&clock_reg_cache_list))
331 register_syscore_ops(&samsung_clk_syscore_ops);
332
333 reg_cache->reg_base = reg_base;
334 reg_cache->rd_num = nr_rdump;
335 reg_cache->rsuspend = rsuspend;
336 reg_cache->rsuspend_num = nr_rsuspend;
337 list_add_tail(®_cache->node, &clock_reg_cache_list);
338}
339#endif
340
341
342
343
344
345struct samsung_clk_provider * __init samsung_cmu_register_one(
346 struct device_node *np,
347 const struct samsung_cmu_info *cmu)
348{
349 void __iomem *reg_base;
350 struct samsung_clk_provider *ctx;
351
352 reg_base = of_iomap(np, 0);
353 if (!reg_base) {
354 panic("%s: failed to map registers\n", __func__);
355 return NULL;
356 }
357
358 ctx = samsung_clk_init(np, reg_base, cmu->nr_clk_ids);
359
360 if (cmu->pll_clks)
361 samsung_clk_register_pll(ctx, cmu->pll_clks, cmu->nr_pll_clks,
362 reg_base);
363 if (cmu->mux_clks)
364 samsung_clk_register_mux(ctx, cmu->mux_clks,
365 cmu->nr_mux_clks);
366 if (cmu->div_clks)
367 samsung_clk_register_div(ctx, cmu->div_clks, cmu->nr_div_clks);
368 if (cmu->gate_clks)
369 samsung_clk_register_gate(ctx, cmu->gate_clks,
370 cmu->nr_gate_clks);
371 if (cmu->fixed_clks)
372 samsung_clk_register_fixed_rate(ctx, cmu->fixed_clks,
373 cmu->nr_fixed_clks);
374 if (cmu->fixed_factor_clks)
375 samsung_clk_register_fixed_factor(ctx, cmu->fixed_factor_clks,
376 cmu->nr_fixed_factor_clks);
377 if (cmu->clk_regs)
378 samsung_clk_extended_sleep_init(reg_base,
379 cmu->clk_regs, cmu->nr_clk_regs,
380 cmu->suspend_regs, cmu->nr_suspend_regs);
381
382 samsung_clk_of_add_provider(np, ctx);
383
384 return ctx;
385}
386