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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; | |
55 | return parent_rate / (usbdiv + 1); | |
56 | } | |
57 | ||
58 | static long at91sam9x5_clk_usb_round_rate(struct clk_hw *hw, unsigned long rate, | |
59 | unsigned long *parent_rate) | |
60 | { | |
61 | unsigned long div; | |
62 | unsigned long bestrate; | |
63 | unsigned long tmp; | |
64 | ||
65 | if (rate >= *parent_rate) | |
66 | return *parent_rate; | |
67 | ||
68 | div = *parent_rate / rate; | |
69 | if (div >= SAM9X5_USB_MAX_DIV) | |
70 | return *parent_rate / (SAM9X5_USB_MAX_DIV + 1); | |
71 | ||
72 | bestrate = *parent_rate / div; | |
73 | tmp = *parent_rate / (div + 1); | |
74 | if (bestrate - rate > rate - tmp) | |
75 | bestrate = tmp; | |
76 | ||
77 | return bestrate; | |
78 | } | |
79 | ||
80 | static int at91sam9x5_clk_usb_set_parent(struct clk_hw *hw, u8 index) | |
81 | { | |
82 | u32 tmp; | |
83 | struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw); | |
84 | struct at91_pmc *pmc = usb->pmc; | |
85 | ||
86 | if (index > 1) | |
87 | return -EINVAL; | |
88 | tmp = pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_USBS; | |
89 | if (index) | |
90 | tmp |= AT91_PMC_USBS; | |
91 | pmc_write(pmc, AT91_PMC_USB, tmp); | |
92 | return 0; | |
93 | } | |
94 | ||
95 | static u8 at91sam9x5_clk_usb_get_parent(struct clk_hw *hw) | |
96 | { | |
97 | struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw); | |
98 | struct at91_pmc *pmc = usb->pmc; | |
99 | ||
100 | return pmc_read(pmc, AT91_PMC_USB) & AT91_PMC_USBS; | |
101 | } | |
102 | ||
103 | static int at91sam9x5_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate, | |
104 | unsigned long parent_rate) | |
105 | { | |
106 | u32 tmp; | |
107 | struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw); | |
108 | struct at91_pmc *pmc = usb->pmc; | |
109 | unsigned long div = parent_rate / rate; | |
110 | ||
111 | if (parent_rate % rate || div < 1 || div >= SAM9X5_USB_MAX_DIV) | |
112 | return -EINVAL; | |
113 | ||
114 | tmp = pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_OHCIUSBDIV; | |
115 | tmp |= (div - 1) << SAM9X5_USB_DIV_SHIFT; | |
116 | pmc_write(pmc, AT91_PMC_USB, tmp); | |
117 | ||
118 | return 0; | |
119 | } | |
120 | ||
121 | static const struct clk_ops at91sam9x5_usb_ops = { | |
122 | .recalc_rate = at91sam9x5_clk_usb_recalc_rate, | |
123 | .round_rate = at91sam9x5_clk_usb_round_rate, | |
124 | .get_parent = at91sam9x5_clk_usb_get_parent, | |
125 | .set_parent = at91sam9x5_clk_usb_set_parent, | |
126 | .set_rate = at91sam9x5_clk_usb_set_rate, | |
127 | }; | |
128 | ||
129 | static int at91sam9n12_clk_usb_enable(struct clk_hw *hw) | |
130 | { | |
131 | struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw); | |
132 | struct at91_pmc *pmc = usb->pmc; | |
133 | ||
134 | pmc_write(pmc, AT91_PMC_USB, | |
135 | pmc_read(pmc, AT91_PMC_USB) | AT91_PMC_USBS); | |
136 | return 0; | |
137 | } | |
138 | ||
139 | static void at91sam9n12_clk_usb_disable(struct clk_hw *hw) | |
140 | { | |
141 | struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw); | |
142 | struct at91_pmc *pmc = usb->pmc; | |
143 | ||
144 | pmc_write(pmc, AT91_PMC_USB, | |
145 | pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_USBS); | |
146 | } | |
147 | ||
148 | static int at91sam9n12_clk_usb_is_enabled(struct clk_hw *hw) | |
149 | { | |
150 | struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw); | |
151 | struct at91_pmc *pmc = usb->pmc; | |
152 | ||
153 | return !!(pmc_read(pmc, AT91_PMC_USB) & AT91_PMC_USBS); | |
154 | } | |
155 | ||
156 | static const struct clk_ops at91sam9n12_usb_ops = { | |
157 | .enable = at91sam9n12_clk_usb_enable, | |
158 | .disable = at91sam9n12_clk_usb_disable, | |
159 | .is_enabled = at91sam9n12_clk_usb_is_enabled, | |
160 | .recalc_rate = at91sam9x5_clk_usb_recalc_rate, | |
161 | .round_rate = at91sam9x5_clk_usb_round_rate, | |
162 | .set_rate = at91sam9x5_clk_usb_set_rate, | |
163 | }; | |
164 | ||
165 | static struct clk * __init | |
166 | at91sam9x5_clk_register_usb(struct at91_pmc *pmc, const char *name, | |
167 | const char **parent_names, u8 num_parents) | |
168 | { | |
169 | struct at91sam9x5_clk_usb *usb; | |
170 | struct clk *clk = NULL; | |
171 | struct clk_init_data init; | |
172 | ||
173 | usb = kzalloc(sizeof(*usb), GFP_KERNEL); | |
174 | if (!usb) | |
175 | return ERR_PTR(-ENOMEM); | |
176 | ||
177 | init.name = name; | |
178 | init.ops = &at91sam9x5_usb_ops; | |
179 | init.parent_names = parent_names; | |
180 | init.num_parents = num_parents; | |
181 | init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE; | |
182 | ||
183 | usb->hw.init = &init; | |
184 | usb->pmc = pmc; | |
185 | ||
186 | clk = clk_register(NULL, &usb->hw); | |
187 | if (IS_ERR(clk)) | |
188 | kfree(usb); | |
189 | ||
190 | return clk; | |
191 | } | |
192 | ||
193 | static struct clk * __init | |
194 | at91sam9n12_clk_register_usb(struct at91_pmc *pmc, const char *name, | |
195 | const char *parent_name) | |
196 | { | |
197 | struct at91sam9x5_clk_usb *usb; | |
198 | struct clk *clk = NULL; | |
199 | struct clk_init_data init; | |
200 | ||
201 | usb = kzalloc(sizeof(*usb), GFP_KERNEL); | |
202 | if (!usb) | |
203 | return ERR_PTR(-ENOMEM); | |
204 | ||
205 | init.name = name; | |
206 | init.ops = &at91sam9n12_usb_ops; | |
207 | init.parent_names = &parent_name; | |
208 | init.num_parents = 1; | |
209 | init.flags = CLK_SET_RATE_GATE; | |
210 | ||
211 | usb->hw.init = &init; | |
212 | usb->pmc = pmc; | |
213 | ||
214 | clk = clk_register(NULL, &usb->hw); | |
215 | if (IS_ERR(clk)) | |
216 | kfree(usb); | |
217 | ||
218 | return clk; | |
219 | } | |
220 | ||
221 | static unsigned long at91rm9200_clk_usb_recalc_rate(struct clk_hw *hw, | |
222 | unsigned long parent_rate) | |
223 | { | |
224 | struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw); | |
225 | struct at91_pmc *pmc = usb->pmc; | |
226 | u32 tmp; | |
227 | u8 usbdiv; | |
228 | ||
229 | tmp = pmc_read(pmc, AT91_CKGR_PLLBR); | |
230 | usbdiv = (tmp & AT91_PMC_USBDIV) >> RM9200_USB_DIV_SHIFT; | |
231 | if (usb->divisors[usbdiv]) | |
232 | return parent_rate / usb->divisors[usbdiv]; | |
233 | ||
234 | return 0; | |
235 | } | |
236 | ||
237 | static long at91rm9200_clk_usb_round_rate(struct clk_hw *hw, unsigned long rate, | |
238 | unsigned long *parent_rate) | |
239 | { | |
240 | struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw); | |
241 | unsigned long bestrate = 0; | |
242 | int bestdiff = -1; | |
243 | unsigned long tmprate; | |
244 | int tmpdiff; | |
245 | int i = 0; | |
246 | ||
247 | for (i = 0; i < 4; i++) { | |
248 | if (!usb->divisors[i]) | |
249 | continue; | |
250 | tmprate = *parent_rate / usb->divisors[i]; | |
251 | if (tmprate < rate) | |
252 | tmpdiff = rate - tmprate; | |
253 | else | |
254 | tmpdiff = tmprate - rate; | |
255 | ||
256 | if (bestdiff < 0 || bestdiff > tmpdiff) { | |
257 | bestrate = tmprate; | |
258 | bestdiff = tmpdiff; | |
259 | } | |
260 | ||
261 | if (!bestdiff) | |
262 | break; | |
263 | } | |
264 | ||
265 | return bestrate; | |
266 | } | |
267 | ||
268 | static int at91rm9200_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate, | |
269 | unsigned long parent_rate) | |
270 | { | |
271 | u32 tmp; | |
272 | int i; | |
273 | struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw); | |
274 | struct at91_pmc *pmc = usb->pmc; | |
275 | unsigned long div = parent_rate / rate; | |
276 | ||
277 | if (parent_rate % rate) | |
278 | return -EINVAL; | |
279 | for (i = 0; i < RM9200_USB_DIV_TAB_SIZE; i++) { | |
280 | if (usb->divisors[i] == div) { | |
281 | tmp = pmc_read(pmc, AT91_CKGR_PLLBR) & | |
282 | ~AT91_PMC_USBDIV; | |
283 | tmp |= i << RM9200_USB_DIV_SHIFT; | |
284 | pmc_write(pmc, AT91_CKGR_PLLBR, tmp); | |
285 | return 0; | |
286 | } | |
287 | } | |
288 | ||
289 | return -EINVAL; | |
290 | } | |
291 | ||
292 | static const struct clk_ops at91rm9200_usb_ops = { | |
293 | .recalc_rate = at91rm9200_clk_usb_recalc_rate, | |
294 | .round_rate = at91rm9200_clk_usb_round_rate, | |
295 | .set_rate = at91rm9200_clk_usb_set_rate, | |
296 | }; | |
297 | ||
298 | static struct clk * __init | |
299 | at91rm9200_clk_register_usb(struct at91_pmc *pmc, const char *name, | |
300 | const char *parent_name, const u32 *divisors) | |
301 | { | |
302 | struct at91rm9200_clk_usb *usb; | |
303 | struct clk *clk = NULL; | |
304 | struct clk_init_data init; | |
305 | ||
306 | usb = kzalloc(sizeof(*usb), GFP_KERNEL); | |
307 | if (!usb) | |
308 | return ERR_PTR(-ENOMEM); | |
309 | ||
310 | init.name = name; | |
311 | init.ops = &at91rm9200_usb_ops; | |
312 | init.parent_names = &parent_name; | |
313 | init.num_parents = 1; | |
314 | init.flags = 0; | |
315 | ||
316 | usb->hw.init = &init; | |
317 | usb->pmc = pmc; | |
318 | memcpy(usb->divisors, divisors, sizeof(usb->divisors)); | |
319 | ||
320 | clk = clk_register(NULL, &usb->hw); | |
321 | if (IS_ERR(clk)) | |
322 | kfree(usb); | |
323 | ||
324 | return clk; | |
325 | } | |
326 | ||
327 | void __init of_at91sam9x5_clk_usb_setup(struct device_node *np, | |
328 | struct at91_pmc *pmc) | |
329 | { | |
330 | struct clk *clk; | |
331 | int i; | |
332 | int num_parents; | |
333 | const char *parent_names[USB_SOURCE_MAX]; | |
334 | const char *name = np->name; | |
335 | ||
336 | num_parents = of_count_phandle_with_args(np, "clocks", "#clock-cells"); | |
337 | if (num_parents <= 0 || num_parents > USB_SOURCE_MAX) | |
338 | return; | |
339 | ||
340 | for (i = 0; i < num_parents; i++) { | |
341 | parent_names[i] = of_clk_get_parent_name(np, i); | |
342 | if (!parent_names[i]) | |
343 | return; | |
344 | } | |
345 | ||
346 | of_property_read_string(np, "clock-output-names", &name); | |
347 | ||
348 | clk = at91sam9x5_clk_register_usb(pmc, name, parent_names, num_parents); | |
349 | if (IS_ERR(clk)) | |
350 | return; | |
351 | ||
352 | of_clk_add_provider(np, of_clk_src_simple_get, clk); | |
353 | } | |
354 | ||
355 | void __init of_at91sam9n12_clk_usb_setup(struct device_node *np, | |
356 | struct at91_pmc *pmc) | |
357 | { | |
358 | struct clk *clk; | |
359 | const char *parent_name; | |
360 | const char *name = np->name; | |
361 | ||
362 | parent_name = of_clk_get_parent_name(np, 0); | |
363 | if (!parent_name) | |
364 | return; | |
365 | ||
366 | of_property_read_string(np, "clock-output-names", &name); | |
367 | ||
368 | clk = at91sam9n12_clk_register_usb(pmc, name, parent_name); | |
369 | if (IS_ERR(clk)) | |
370 | return; | |
371 | ||
372 | of_clk_add_provider(np, of_clk_src_simple_get, clk); | |
373 | } | |
374 | ||
375 | void __init of_at91rm9200_clk_usb_setup(struct device_node *np, | |
376 | struct at91_pmc *pmc) | |
377 | { | |
378 | struct clk *clk; | |
379 | const char *parent_name; | |
380 | const char *name = np->name; | |
381 | u32 divisors[4] = {0, 0, 0, 0}; | |
382 | ||
383 | parent_name = of_clk_get_parent_name(np, 0); | |
384 | if (!parent_name) | |
385 | return; | |
386 | ||
387 | of_property_read_u32_array(np, "atmel,clk-divisors", divisors, 4); | |
388 | if (!divisors[0]) | |
389 | return; | |
390 | ||
391 | of_property_read_string(np, "clock-output-names", &name); | |
392 | ||
393 | clk = at91rm9200_clk_register_usb(pmc, name, parent_name, divisors); | |
394 | if (IS_ERR(clk)) | |
395 | return; | |
396 | ||
397 | of_clk_add_provider(np, of_clk_src_simple_get, clk); | |
398 | } |