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