1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
4 */
5
6 #include <linux/clk-provider.h>
7 #include <linux/clkdev.h>
8 #include <linux/clk/at91_pmc.h>
9 #include <linux/of.h>
10 #include <linux/mfd/syscon.h>
11 #include <linux/regmap.h>
12
13 #include "pmc.h"
14
15 #define SAM9X5_USB_DIV_SHIFT 8
16 #define SAM9X5_USB_MAX_DIV 0xf
17
18 #define RM9200_USB_DIV_SHIFT 28
19 #define RM9200_USB_DIV_TAB_SIZE 4
20
21 #define SAM9X5_USBS_MASK GENMASK(0, 0)
22 #define SAM9X60_USBS_MASK GENMASK(1, 0)
23
24 struct at91sam9x5_clk_usb {
25 struct clk_hw hw;
26 struct regmap *regmap;
27 struct at91_clk_pms pms;
28 u32 usbs_mask;
29 u8 num_parents;
30 };
31
32 #define to_at91sam9x5_clk_usb(hw) \
33 container_of(hw, struct at91sam9x5_clk_usb, hw)
34
35 struct at91rm9200_clk_usb {
36 struct clk_hw hw;
37 struct regmap *regmap;
38 u32 divisors[4];
39 };
40
41 #define to_at91rm9200_clk_usb(hw) \
42 container_of(hw, struct at91rm9200_clk_usb, hw)
43
at91sam9x5_clk_usb_recalc_rate(struct clk_hw * hw,unsigned long parent_rate)44 static unsigned long at91sam9x5_clk_usb_recalc_rate(struct clk_hw *hw,
45 unsigned long parent_rate)
46 {
47 struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
48 unsigned int usbr;
49 u8 usbdiv;
50
51 regmap_read(usb->regmap, AT91_PMC_USB, &usbr);
52 usbdiv = (usbr & AT91_PMC_OHCIUSBDIV) >> SAM9X5_USB_DIV_SHIFT;
53
54 return DIV_ROUND_CLOSEST(parent_rate, (usbdiv + 1));
55 }
56
at91sam9x5_clk_usb_determine_rate(struct clk_hw * hw,struct clk_rate_request * req)57 static int at91sam9x5_clk_usb_determine_rate(struct clk_hw *hw,
58 struct clk_rate_request *req)
59 {
60 struct clk_hw *parent;
61 long best_rate = -EINVAL;
62 unsigned long tmp_rate;
63 int best_diff = -1;
64 int tmp_diff;
65 int i;
66
67 for (i = 0; i < clk_hw_get_num_parents(hw); i++) {
68 int div;
69
70 parent = clk_hw_get_parent_by_index(hw, i);
71 if (!parent)
72 continue;
73
74 for (div = 1; div < SAM9X5_USB_MAX_DIV + 2; div++) {
75 unsigned long tmp_parent_rate;
76
77 tmp_parent_rate = req->rate * div;
78 tmp_parent_rate = clk_hw_round_rate(parent,
79 tmp_parent_rate);
80 if (!tmp_parent_rate)
81 continue;
82
83 tmp_rate = DIV_ROUND_CLOSEST(tmp_parent_rate, div);
84 if (tmp_rate < req->rate)
85 tmp_diff = req->rate - tmp_rate;
86 else
87 tmp_diff = tmp_rate - req->rate;
88
89 if (best_diff < 0 || best_diff > tmp_diff) {
90 best_rate = tmp_rate;
91 best_diff = tmp_diff;
92 req->best_parent_rate = tmp_parent_rate;
93 req->best_parent_hw = parent;
94 }
95
96 if (!best_diff || tmp_rate < req->rate)
97 break;
98 }
99
100 if (!best_diff)
101 break;
102 }
103
104 if (best_rate < 0)
105 return best_rate;
106
107 req->rate = best_rate;
108 return 0;
109 }
110
at91sam9x5_clk_usb_set_parent(struct clk_hw * hw,u8 index)111 static int at91sam9x5_clk_usb_set_parent(struct clk_hw *hw, u8 index)
112 {
113 struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
114
115 if (index >= usb->num_parents)
116 return -EINVAL;
117
118 regmap_update_bits(usb->regmap, AT91_PMC_USB, usb->usbs_mask, index);
119
120 return 0;
121 }
122
at91sam9x5_clk_usb_get_parent(struct clk_hw * hw)123 static u8 at91sam9x5_clk_usb_get_parent(struct clk_hw *hw)
124 {
125 struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
126 unsigned int usbr;
127
128 regmap_read(usb->regmap, AT91_PMC_USB, &usbr);
129
130 return usbr & usb->usbs_mask;
131 }
132
at91sam9x5_clk_usb_set_rate(struct clk_hw * hw,unsigned long rate,unsigned long parent_rate)133 static int at91sam9x5_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate,
134 unsigned long parent_rate)
135 {
136 struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
137 unsigned long div;
138
139 if (!rate)
140 return -EINVAL;
141
142 div = DIV_ROUND_CLOSEST(parent_rate, rate);
143 if (div > SAM9X5_USB_MAX_DIV + 1 || !div)
144 return -EINVAL;
145
146 regmap_update_bits(usb->regmap, AT91_PMC_USB, AT91_PMC_OHCIUSBDIV,
147 (div - 1) << SAM9X5_USB_DIV_SHIFT);
148
149 return 0;
150 }
151
at91sam9x5_usb_save_context(struct clk_hw * hw)152 static int at91sam9x5_usb_save_context(struct clk_hw *hw)
153 {
154 struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
155 struct clk_hw *parent_hw = clk_hw_get_parent(hw);
156
157 usb->pms.parent = at91sam9x5_clk_usb_get_parent(hw);
158 usb->pms.parent_rate = clk_hw_get_rate(parent_hw);
159 usb->pms.rate = at91sam9x5_clk_usb_recalc_rate(hw, usb->pms.parent_rate);
160
161 return 0;
162 }
163
at91sam9x5_usb_restore_context(struct clk_hw * hw)164 static void at91sam9x5_usb_restore_context(struct clk_hw *hw)
165 {
166 struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
167 int ret;
168
169 ret = at91sam9x5_clk_usb_set_parent(hw, usb->pms.parent);
170 if (ret)
171 return;
172
173 at91sam9x5_clk_usb_set_rate(hw, usb->pms.rate, usb->pms.parent_rate);
174 }
175
176 static const struct clk_ops at91sam9x5_usb_ops = {
177 .recalc_rate = at91sam9x5_clk_usb_recalc_rate,
178 .determine_rate = at91sam9x5_clk_usb_determine_rate,
179 .get_parent = at91sam9x5_clk_usb_get_parent,
180 .set_parent = at91sam9x5_clk_usb_set_parent,
181 .set_rate = at91sam9x5_clk_usb_set_rate,
182 .save_context = at91sam9x5_usb_save_context,
183 .restore_context = at91sam9x5_usb_restore_context,
184 };
185
at91sam9n12_clk_usb_enable(struct clk_hw * hw)186 static int at91sam9n12_clk_usb_enable(struct clk_hw *hw)
187 {
188 struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
189
190 regmap_update_bits(usb->regmap, AT91_PMC_USB, AT91_PMC_USBS,
191 AT91_PMC_USBS);
192
193 return 0;
194 }
195
at91sam9n12_clk_usb_disable(struct clk_hw * hw)196 static void at91sam9n12_clk_usb_disable(struct clk_hw *hw)
197 {
198 struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
199
200 regmap_update_bits(usb->regmap, AT91_PMC_USB, AT91_PMC_USBS, 0);
201 }
202
at91sam9n12_clk_usb_is_enabled(struct clk_hw * hw)203 static int at91sam9n12_clk_usb_is_enabled(struct clk_hw *hw)
204 {
205 struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
206 unsigned int usbr;
207
208 regmap_read(usb->regmap, AT91_PMC_USB, &usbr);
209
210 return usbr & AT91_PMC_USBS;
211 }
212
213 static const struct clk_ops at91sam9n12_usb_ops = {
214 .enable = at91sam9n12_clk_usb_enable,
215 .disable = at91sam9n12_clk_usb_disable,
216 .is_enabled = at91sam9n12_clk_usb_is_enabled,
217 .recalc_rate = at91sam9x5_clk_usb_recalc_rate,
218 .determine_rate = at91sam9x5_clk_usb_determine_rate,
219 .set_rate = at91sam9x5_clk_usb_set_rate,
220 };
221
222 static struct clk_hw * __init
_at91sam9x5_clk_register_usb(struct regmap * regmap,const char * name,const char ** parent_names,u8 num_parents,u32 usbs_mask)223 _at91sam9x5_clk_register_usb(struct regmap *regmap, const char *name,
224 const char **parent_names, u8 num_parents,
225 u32 usbs_mask)
226 {
227 struct at91sam9x5_clk_usb *usb;
228 struct clk_hw *hw;
229 struct clk_init_data init;
230 int ret;
231
232 usb = kzalloc(sizeof(*usb), GFP_KERNEL);
233 if (!usb)
234 return ERR_PTR(-ENOMEM);
235
236 init.name = name;
237 init.ops = &at91sam9x5_usb_ops;
238 init.parent_names = parent_names;
239 init.num_parents = num_parents;
240 init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE |
241 CLK_SET_RATE_PARENT;
242
243 usb->hw.init = &init;
244 usb->regmap = regmap;
245 usb->usbs_mask = usbs_mask;
246 usb->num_parents = num_parents;
247
248 hw = &usb->hw;
249 ret = clk_hw_register(NULL, &usb->hw);
250 if (ret) {
251 kfree(usb);
252 hw = ERR_PTR(ret);
253 }
254
255 return hw;
256 }
257
258 struct clk_hw * __init
at91sam9x5_clk_register_usb(struct regmap * regmap,const char * name,const char ** parent_names,u8 num_parents)259 at91sam9x5_clk_register_usb(struct regmap *regmap, const char *name,
260 const char **parent_names, u8 num_parents)
261 {
262 return _at91sam9x5_clk_register_usb(regmap, name, parent_names,
263 num_parents, SAM9X5_USBS_MASK);
264 }
265
266 struct clk_hw * __init
sam9x60_clk_register_usb(struct regmap * regmap,const char * name,const char ** parent_names,u8 num_parents)267 sam9x60_clk_register_usb(struct regmap *regmap, const char *name,
268 const char **parent_names, u8 num_parents)
269 {
270 return _at91sam9x5_clk_register_usb(regmap, name, parent_names,
271 num_parents, SAM9X60_USBS_MASK);
272 }
273
274 struct clk_hw * __init
at91sam9n12_clk_register_usb(struct regmap * regmap,const char * name,const char * parent_name)275 at91sam9n12_clk_register_usb(struct regmap *regmap, const char *name,
276 const char *parent_name)
277 {
278 struct at91sam9x5_clk_usb *usb;
279 struct clk_hw *hw;
280 struct clk_init_data init;
281 int ret;
282
283 usb = kzalloc(sizeof(*usb), GFP_KERNEL);
284 if (!usb)
285 return ERR_PTR(-ENOMEM);
286
287 init.name = name;
288 init.ops = &at91sam9n12_usb_ops;
289 init.parent_names = &parent_name;
290 init.num_parents = 1;
291 init.flags = CLK_SET_RATE_GATE | CLK_SET_RATE_PARENT;
292
293 usb->hw.init = &init;
294 usb->regmap = regmap;
295
296 hw = &usb->hw;
297 ret = clk_hw_register(NULL, &usb->hw);
298 if (ret) {
299 kfree(usb);
300 hw = ERR_PTR(ret);
301 }
302
303 return hw;
304 }
305
at91rm9200_clk_usb_recalc_rate(struct clk_hw * hw,unsigned long parent_rate)306 static unsigned long at91rm9200_clk_usb_recalc_rate(struct clk_hw *hw,
307 unsigned long parent_rate)
308 {
309 struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
310 unsigned int pllbr;
311 u8 usbdiv;
312
313 regmap_read(usb->regmap, AT91_CKGR_PLLBR, &pllbr);
314
315 usbdiv = (pllbr & AT91_PMC_USBDIV) >> RM9200_USB_DIV_SHIFT;
316 if (usb->divisors[usbdiv])
317 return parent_rate / usb->divisors[usbdiv];
318
319 return 0;
320 }
321
at91rm9200_clk_usb_round_rate(struct clk_hw * hw,unsigned long rate,unsigned long * parent_rate)322 static long at91rm9200_clk_usb_round_rate(struct clk_hw *hw, unsigned long rate,
323 unsigned long *parent_rate)
324 {
325 struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
326 struct clk_hw *parent = clk_hw_get_parent(hw);
327 unsigned long bestrate = 0;
328 int bestdiff = -1;
329 unsigned long tmprate;
330 int tmpdiff;
331 int i = 0;
332
333 for (i = 0; i < RM9200_USB_DIV_TAB_SIZE; i++) {
334 unsigned long tmp_parent_rate;
335
336 if (!usb->divisors[i])
337 continue;
338
339 tmp_parent_rate = rate * usb->divisors[i];
340 tmp_parent_rate = clk_hw_round_rate(parent, tmp_parent_rate);
341 tmprate = DIV_ROUND_CLOSEST(tmp_parent_rate, usb->divisors[i]);
342 if (tmprate < rate)
343 tmpdiff = rate - tmprate;
344 else
345 tmpdiff = tmprate - rate;
346
347 if (bestdiff < 0 || bestdiff > tmpdiff) {
348 bestrate = tmprate;
349 bestdiff = tmpdiff;
350 *parent_rate = tmp_parent_rate;
351 }
352
353 if (!bestdiff)
354 break;
355 }
356
357 return bestrate;
358 }
359
at91rm9200_clk_usb_set_rate(struct clk_hw * hw,unsigned long rate,unsigned long parent_rate)360 static int at91rm9200_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate,
361 unsigned long parent_rate)
362 {
363 int i;
364 struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
365 unsigned long div;
366
367 if (!rate)
368 return -EINVAL;
369
370 div = DIV_ROUND_CLOSEST(parent_rate, rate);
371
372 for (i = 0; i < RM9200_USB_DIV_TAB_SIZE; i++) {
373 if (usb->divisors[i] == div) {
374 regmap_update_bits(usb->regmap, AT91_CKGR_PLLBR,
375 AT91_PMC_USBDIV,
376 i << RM9200_USB_DIV_SHIFT);
377
378 return 0;
379 }
380 }
381
382 return -EINVAL;
383 }
384
385 static const struct clk_ops at91rm9200_usb_ops = {
386 .recalc_rate = at91rm9200_clk_usb_recalc_rate,
387 .round_rate = at91rm9200_clk_usb_round_rate,
388 .set_rate = at91rm9200_clk_usb_set_rate,
389 };
390
391 struct clk_hw * __init
at91rm9200_clk_register_usb(struct regmap * regmap,const char * name,const char * parent_name,const u32 * divisors)392 at91rm9200_clk_register_usb(struct regmap *regmap, const char *name,
393 const char *parent_name, const u32 *divisors)
394 {
395 struct at91rm9200_clk_usb *usb;
396 struct clk_hw *hw;
397 struct clk_init_data init;
398 int ret;
399
400 usb = kzalloc(sizeof(*usb), GFP_KERNEL);
401 if (!usb)
402 return ERR_PTR(-ENOMEM);
403
404 init.name = name;
405 init.ops = &at91rm9200_usb_ops;
406 init.parent_names = &parent_name;
407 init.num_parents = 1;
408 init.flags = CLK_SET_RATE_PARENT;
409
410 usb->hw.init = &init;
411 usb->regmap = regmap;
412 memcpy(usb->divisors, divisors, sizeof(usb->divisors));
413
414 hw = &usb->hw;
415 ret = clk_hw_register(NULL, &usb->hw);
416 if (ret) {
417 kfree(usb);
418 hw = ERR_PTR(ret);
419 }
420
421 return hw;
422 }
423