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c84a61d8 BB |
1 | /* |
2 | * Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | */ | |
10 | ||
11 | #include <linux/clk-provider.h> | |
12 | #include <linux/clkdev.h> | |
13 | #include <linux/clk/at91_pmc.h> | |
14 | #include <linux/of.h> | |
15 | #include <linux/of_address.h> | |
16 | #include <linux/io.h> | |
17 | ||
18 | #include "pmc.h" | |
19 | ||
20 | #define USB_SOURCE_MAX 2 | |
21 | ||
22 | #define SAM9X5_USB_DIV_SHIFT 8 | |
23 | #define SAM9X5_USB_MAX_DIV 0xf | |
24 | ||
25 | #define RM9200_USB_DIV_SHIFT 28 | |
26 | #define RM9200_USB_DIV_TAB_SIZE 4 | |
27 | ||
28 | struct at91sam9x5_clk_usb { | |
29 | struct clk_hw hw; | |
30 | struct at91_pmc *pmc; | |
31 | }; | |
32 | ||
33 | #define to_at91sam9x5_clk_usb(hw) \ | |
34 | container_of(hw, struct at91sam9x5_clk_usb, hw) | |
35 | ||
36 | struct at91rm9200_clk_usb { | |
37 | struct clk_hw hw; | |
38 | struct at91_pmc *pmc; | |
39 | u32 divisors[4]; | |
40 | }; | |
41 | ||
42 | #define to_at91rm9200_clk_usb(hw) \ | |
43 | container_of(hw, struct at91rm9200_clk_usb, hw) | |
44 | ||
45 | static unsigned long at91sam9x5_clk_usb_recalc_rate(struct clk_hw *hw, | |
46 | unsigned long parent_rate) | |
47 | { | |
48 | u32 tmp; | |
49 | u8 usbdiv; | |
50 | struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw); | |
51 | struct at91_pmc *pmc = usb->pmc; | |
52 | ||
53 | tmp = pmc_read(pmc, AT91_PMC_USB); | |
54 | usbdiv = (tmp & AT91_PMC_OHCIUSBDIV) >> SAM9X5_USB_DIV_SHIFT; | |
69daf75a BB |
55 | |
56 | return DIV_ROUND_CLOSEST(parent_rate, (usbdiv + 1)); | |
c84a61d8 BB |
57 | } |
58 | ||
0817b62c BB |
59 | static int at91sam9x5_clk_usb_determine_rate(struct clk_hw *hw, |
60 | struct clk_rate_request *req) | |
c84a61d8 | 61 | { |
45912431 BB |
62 | struct clk *parent = NULL; |
63 | long best_rate = -EINVAL; | |
64 | unsigned long tmp_rate; | |
65 | int best_diff = -1; | |
66 | int tmp_diff; | |
67 | int i; | |
68 | ||
497295af | 69 | for (i = 0; i < clk_hw_get_num_parents(hw); i++) { |
45912431 BB |
70 | int div; |
71 | ||
72 | parent = clk_get_parent_by_index(hw->clk, i); | |
73 | if (!parent) | |
74 | continue; | |
75 | ||
76 | for (div = 1; div < SAM9X5_USB_MAX_DIV + 2; div++) { | |
77 | unsigned long tmp_parent_rate; | |
78 | ||
0817b62c | 79 | tmp_parent_rate = req->rate * div; |
45912431 BB |
80 | tmp_parent_rate = __clk_round_rate(parent, |
81 | tmp_parent_rate); | |
82 | tmp_rate = DIV_ROUND_CLOSEST(tmp_parent_rate, div); | |
0817b62c BB |
83 | if (tmp_rate < req->rate) |
84 | tmp_diff = req->rate - tmp_rate; | |
45912431 | 85 | else |
0817b62c | 86 | tmp_diff = tmp_rate - req->rate; |
45912431 BB |
87 | |
88 | if (best_diff < 0 || best_diff > tmp_diff) { | |
89 | best_rate = tmp_rate; | |
90 | best_diff = tmp_diff; | |
0817b62c BB |
91 | req->best_parent_rate = tmp_parent_rate; |
92 | req->best_parent_hw = __clk_get_hw(parent); | |
45912431 BB |
93 | } |
94 | ||
0817b62c | 95 | if (!best_diff || tmp_rate < req->rate) |
45912431 BB |
96 | break; |
97 | } | |
98 | ||
99 | if (!best_diff) | |
100 | break; | |
101 | } | |
102 | ||
0817b62c BB |
103 | if (best_rate < 0) |
104 | return best_rate; | |
105 | ||
106 | req->rate = best_rate; | |
107 | return 0; | |
c84a61d8 BB |
108 | } |
109 | ||
110 | static int at91sam9x5_clk_usb_set_parent(struct clk_hw *hw, u8 index) | |
111 | { | |
112 | u32 tmp; | |
113 | struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw); | |
114 | struct at91_pmc *pmc = usb->pmc; | |
115 | ||
116 | if (index > 1) | |
117 | return -EINVAL; | |
118 | tmp = pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_USBS; | |
119 | if (index) | |
120 | tmp |= AT91_PMC_USBS; | |
121 | pmc_write(pmc, AT91_PMC_USB, tmp); | |
122 | return 0; | |
123 | } | |
124 | ||
125 | static u8 at91sam9x5_clk_usb_get_parent(struct clk_hw *hw) | |
126 | { | |
127 | struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw); | |
128 | struct at91_pmc *pmc = usb->pmc; | |
129 | ||
130 | return pmc_read(pmc, AT91_PMC_USB) & AT91_PMC_USBS; | |
131 | } | |
132 | ||
133 | static int at91sam9x5_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate, | |
134 | unsigned long parent_rate) | |
135 | { | |
136 | u32 tmp; | |
137 | struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw); | |
138 | struct at91_pmc *pmc = usb->pmc; | |
69daf75a BB |
139 | unsigned long div; |
140 | ||
141 | if (!rate) | |
142 | return -EINVAL; | |
c84a61d8 | 143 | |
69daf75a BB |
144 | div = DIV_ROUND_CLOSEST(parent_rate, rate); |
145 | if (div > SAM9X5_USB_MAX_DIV + 1 || !div) | |
c84a61d8 BB |
146 | return -EINVAL; |
147 | ||
148 | tmp = pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_OHCIUSBDIV; | |
149 | tmp |= (div - 1) << SAM9X5_USB_DIV_SHIFT; | |
150 | pmc_write(pmc, AT91_PMC_USB, tmp); | |
151 | ||
152 | return 0; | |
153 | } | |
154 | ||
155 | static const struct clk_ops at91sam9x5_usb_ops = { | |
156 | .recalc_rate = at91sam9x5_clk_usb_recalc_rate, | |
45912431 | 157 | .determine_rate = at91sam9x5_clk_usb_determine_rate, |
c84a61d8 BB |
158 | .get_parent = at91sam9x5_clk_usb_get_parent, |
159 | .set_parent = at91sam9x5_clk_usb_set_parent, | |
160 | .set_rate = at91sam9x5_clk_usb_set_rate, | |
161 | }; | |
162 | ||
163 | static int at91sam9n12_clk_usb_enable(struct clk_hw *hw) | |
164 | { | |
165 | struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw); | |
166 | struct at91_pmc *pmc = usb->pmc; | |
167 | ||
168 | pmc_write(pmc, AT91_PMC_USB, | |
169 | pmc_read(pmc, AT91_PMC_USB) | AT91_PMC_USBS); | |
170 | return 0; | |
171 | } | |
172 | ||
173 | static void at91sam9n12_clk_usb_disable(struct clk_hw *hw) | |
174 | { | |
175 | struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw); | |
176 | struct at91_pmc *pmc = usb->pmc; | |
177 | ||
178 | pmc_write(pmc, AT91_PMC_USB, | |
179 | pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_USBS); | |
180 | } | |
181 | ||
182 | static int at91sam9n12_clk_usb_is_enabled(struct clk_hw *hw) | |
183 | { | |
184 | struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw); | |
185 | struct at91_pmc *pmc = usb->pmc; | |
186 | ||
187 | return !!(pmc_read(pmc, AT91_PMC_USB) & AT91_PMC_USBS); | |
188 | } | |
189 | ||
190 | static const struct clk_ops at91sam9n12_usb_ops = { | |
191 | .enable = at91sam9n12_clk_usb_enable, | |
192 | .disable = at91sam9n12_clk_usb_disable, | |
193 | .is_enabled = at91sam9n12_clk_usb_is_enabled, | |
194 | .recalc_rate = at91sam9x5_clk_usb_recalc_rate, | |
45912431 | 195 | .determine_rate = at91sam9x5_clk_usb_determine_rate, |
c84a61d8 BB |
196 | .set_rate = at91sam9x5_clk_usb_set_rate, |
197 | }; | |
198 | ||
199 | static struct clk * __init | |
200 | at91sam9x5_clk_register_usb(struct at91_pmc *pmc, const char *name, | |
201 | const char **parent_names, u8 num_parents) | |
202 | { | |
203 | struct at91sam9x5_clk_usb *usb; | |
204 | struct clk *clk = NULL; | |
205 | struct clk_init_data init; | |
206 | ||
207 | usb = kzalloc(sizeof(*usb), GFP_KERNEL); | |
208 | if (!usb) | |
209 | return ERR_PTR(-ENOMEM); | |
210 | ||
211 | init.name = name; | |
212 | init.ops = &at91sam9x5_usb_ops; | |
213 | init.parent_names = parent_names; | |
214 | init.num_parents = num_parents; | |
45912431 BB |
215 | init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE | |
216 | CLK_SET_RATE_PARENT; | |
c84a61d8 BB |
217 | |
218 | usb->hw.init = &init; | |
219 | usb->pmc = pmc; | |
220 | ||
221 | clk = clk_register(NULL, &usb->hw); | |
222 | if (IS_ERR(clk)) | |
223 | kfree(usb); | |
224 | ||
225 | return clk; | |
226 | } | |
227 | ||
228 | static struct clk * __init | |
229 | at91sam9n12_clk_register_usb(struct at91_pmc *pmc, const char *name, | |
230 | const char *parent_name) | |
231 | { | |
232 | struct at91sam9x5_clk_usb *usb; | |
233 | struct clk *clk = NULL; | |
234 | struct clk_init_data init; | |
235 | ||
236 | usb = kzalloc(sizeof(*usb), GFP_KERNEL); | |
237 | if (!usb) | |
238 | return ERR_PTR(-ENOMEM); | |
239 | ||
240 | init.name = name; | |
241 | init.ops = &at91sam9n12_usb_ops; | |
242 | init.parent_names = &parent_name; | |
243 | init.num_parents = 1; | |
45912431 | 244 | init.flags = CLK_SET_RATE_GATE | CLK_SET_RATE_PARENT; |
c84a61d8 BB |
245 | |
246 | usb->hw.init = &init; | |
247 | usb->pmc = pmc; | |
248 | ||
249 | clk = clk_register(NULL, &usb->hw); | |
250 | if (IS_ERR(clk)) | |
251 | kfree(usb); | |
252 | ||
253 | return clk; | |
254 | } | |
255 | ||
256 | static unsigned long at91rm9200_clk_usb_recalc_rate(struct clk_hw *hw, | |
257 | unsigned long parent_rate) | |
258 | { | |
259 | struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw); | |
260 | struct at91_pmc *pmc = usb->pmc; | |
261 | u32 tmp; | |
262 | u8 usbdiv; | |
263 | ||
264 | tmp = pmc_read(pmc, AT91_CKGR_PLLBR); | |
265 | usbdiv = (tmp & AT91_PMC_USBDIV) >> RM9200_USB_DIV_SHIFT; | |
266 | if (usb->divisors[usbdiv]) | |
267 | return parent_rate / usb->divisors[usbdiv]; | |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
272 | static long at91rm9200_clk_usb_round_rate(struct clk_hw *hw, unsigned long rate, | |
273 | unsigned long *parent_rate) | |
274 | { | |
275 | struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw); | |
13a6073d | 276 | struct clk *parent = __clk_get_parent(hw->clk); |
c84a61d8 BB |
277 | unsigned long bestrate = 0; |
278 | int bestdiff = -1; | |
279 | unsigned long tmprate; | |
280 | int tmpdiff; | |
281 | int i = 0; | |
282 | ||
13a6073d BB |
283 | for (i = 0; i < RM9200_USB_DIV_TAB_SIZE; i++) { |
284 | unsigned long tmp_parent_rate; | |
285 | ||
c84a61d8 BB |
286 | if (!usb->divisors[i]) |
287 | continue; | |
13a6073d BB |
288 | |
289 | tmp_parent_rate = rate * usb->divisors[i]; | |
290 | tmp_parent_rate = __clk_round_rate(parent, tmp_parent_rate); | |
ff553ea1 | 291 | tmprate = DIV_ROUND_CLOSEST(tmp_parent_rate, usb->divisors[i]); |
c84a61d8 BB |
292 | if (tmprate < rate) |
293 | tmpdiff = rate - tmprate; | |
294 | else | |
295 | tmpdiff = tmprate - rate; | |
296 | ||
297 | if (bestdiff < 0 || bestdiff > tmpdiff) { | |
298 | bestrate = tmprate; | |
299 | bestdiff = tmpdiff; | |
13a6073d | 300 | *parent_rate = tmp_parent_rate; |
c84a61d8 BB |
301 | } |
302 | ||
303 | if (!bestdiff) | |
304 | break; | |
305 | } | |
306 | ||
307 | return bestrate; | |
308 | } | |
309 | ||
310 | static int at91rm9200_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate, | |
311 | unsigned long parent_rate) | |
312 | { | |
313 | u32 tmp; | |
314 | int i; | |
315 | struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw); | |
316 | struct at91_pmc *pmc = usb->pmc; | |
16eeaec7 | 317 | unsigned long div; |
c84a61d8 | 318 | |
ff553ea1 | 319 | if (!rate) |
c84a61d8 | 320 | return -EINVAL; |
16eeaec7 | 321 | |
ff553ea1 | 322 | div = DIV_ROUND_CLOSEST(parent_rate, rate); |
16eeaec7 | 323 | |
c84a61d8 BB |
324 | for (i = 0; i < RM9200_USB_DIV_TAB_SIZE; i++) { |
325 | if (usb->divisors[i] == div) { | |
326 | tmp = pmc_read(pmc, AT91_CKGR_PLLBR) & | |
327 | ~AT91_PMC_USBDIV; | |
328 | tmp |= i << RM9200_USB_DIV_SHIFT; | |
329 | pmc_write(pmc, AT91_CKGR_PLLBR, tmp); | |
330 | return 0; | |
331 | } | |
332 | } | |
333 | ||
334 | return -EINVAL; | |
335 | } | |
336 | ||
337 | static const struct clk_ops at91rm9200_usb_ops = { | |
338 | .recalc_rate = at91rm9200_clk_usb_recalc_rate, | |
339 | .round_rate = at91rm9200_clk_usb_round_rate, | |
340 | .set_rate = at91rm9200_clk_usb_set_rate, | |
341 | }; | |
342 | ||
343 | static struct clk * __init | |
344 | at91rm9200_clk_register_usb(struct at91_pmc *pmc, const char *name, | |
345 | const char *parent_name, const u32 *divisors) | |
346 | { | |
347 | struct at91rm9200_clk_usb *usb; | |
348 | struct clk *clk = NULL; | |
349 | struct clk_init_data init; | |
350 | ||
351 | usb = kzalloc(sizeof(*usb), GFP_KERNEL); | |
352 | if (!usb) | |
353 | return ERR_PTR(-ENOMEM); | |
354 | ||
355 | init.name = name; | |
356 | init.ops = &at91rm9200_usb_ops; | |
357 | init.parent_names = &parent_name; | |
358 | init.num_parents = 1; | |
13a6073d | 359 | init.flags = CLK_SET_RATE_PARENT; |
c84a61d8 BB |
360 | |
361 | usb->hw.init = &init; | |
362 | usb->pmc = pmc; | |
363 | memcpy(usb->divisors, divisors, sizeof(usb->divisors)); | |
364 | ||
365 | clk = clk_register(NULL, &usb->hw); | |
366 | if (IS_ERR(clk)) | |
367 | kfree(usb); | |
368 | ||
369 | return clk; | |
370 | } | |
371 | ||
372 | void __init of_at91sam9x5_clk_usb_setup(struct device_node *np, | |
373 | struct at91_pmc *pmc) | |
374 | { | |
375 | struct clk *clk; | |
c84a61d8 BB |
376 | int num_parents; |
377 | const char *parent_names[USB_SOURCE_MAX]; | |
378 | const char *name = np->name; | |
379 | ||
51a43be9 | 380 | num_parents = of_clk_get_parent_count(np); |
c84a61d8 BB |
381 | if (num_parents <= 0 || num_parents > USB_SOURCE_MAX) |
382 | return; | |
383 | ||
f0557fbe | 384 | of_clk_parent_fill(np, parent_names, num_parents); |
c84a61d8 BB |
385 | |
386 | of_property_read_string(np, "clock-output-names", &name); | |
387 | ||
388 | clk = at91sam9x5_clk_register_usb(pmc, name, parent_names, num_parents); | |
389 | if (IS_ERR(clk)) | |
390 | return; | |
391 | ||
392 | of_clk_add_provider(np, of_clk_src_simple_get, clk); | |
393 | } | |
394 | ||
395 | void __init of_at91sam9n12_clk_usb_setup(struct device_node *np, | |
396 | struct at91_pmc *pmc) | |
397 | { | |
398 | struct clk *clk; | |
399 | const char *parent_name; | |
400 | const char *name = np->name; | |
401 | ||
402 | parent_name = of_clk_get_parent_name(np, 0); | |
403 | if (!parent_name) | |
404 | return; | |
405 | ||
406 | of_property_read_string(np, "clock-output-names", &name); | |
407 | ||
408 | clk = at91sam9n12_clk_register_usb(pmc, name, parent_name); | |
409 | if (IS_ERR(clk)) | |
410 | return; | |
411 | ||
412 | of_clk_add_provider(np, of_clk_src_simple_get, clk); | |
413 | } | |
414 | ||
415 | void __init of_at91rm9200_clk_usb_setup(struct device_node *np, | |
416 | struct at91_pmc *pmc) | |
417 | { | |
418 | struct clk *clk; | |
419 | const char *parent_name; | |
420 | const char *name = np->name; | |
421 | u32 divisors[4] = {0, 0, 0, 0}; | |
422 | ||
423 | parent_name = of_clk_get_parent_name(np, 0); | |
424 | if (!parent_name) | |
425 | return; | |
426 | ||
427 | of_property_read_u32_array(np, "atmel,clk-divisors", divisors, 4); | |
428 | if (!divisors[0]) | |
429 | return; | |
430 | ||
431 | of_property_read_string(np, "clock-output-names", &name); | |
432 | ||
433 | clk = at91rm9200_clk_register_usb(pmc, name, parent_name, divisors); | |
434 | if (IS_ERR(clk)) | |
435 | return; | |
436 | ||
437 | of_clk_add_provider(np, of_clk_src_simple_get, clk); | |
438 | } |