Commit | Line | Data |
---|---|---|
a1391d27 RN |
1 | /* |
2 | * OMAP3/4 - specific DPLL control functions | |
3 | * | |
358965d7 RW |
4 | * Copyright (C) 2009-2010 Texas Instruments, Inc. |
5 | * Copyright (C) 2009-2010 Nokia Corporation | |
a1391d27 RN |
6 | * |
7 | * Written by Paul Walmsley | |
358965d7 RW |
8 | * Testing and integration fixes by Jouni Högander |
9 | * | |
10 | * 36xx support added by Vishwanath BS, Richard Woodruff, and Nishanth | |
11 | * Menon | |
a1391d27 RN |
12 | * |
13 | * Parts of this code are based on code written by | |
14 | * Richard Woodruff, Tony Lindgren, Tuukka Tikkanen, Karthik Dasu | |
15 | * | |
16 | * This program is free software; you can redistribute it and/or modify | |
17 | * it under the terms of the GNU General Public License version 2 as | |
18 | * published by the Free Software Foundation. | |
19 | */ | |
20 | ||
a1391d27 RN |
21 | #include <linux/kernel.h> |
22 | #include <linux/device.h> | |
23 | #include <linux/list.h> | |
24 | #include <linux/errno.h> | |
25 | #include <linux/delay.h> | |
26 | #include <linux/clk.h> | |
27 | #include <linux/io.h> | |
a1391d27 | 28 | #include <linux/bitops.h> |
6d803ba7 | 29 | #include <linux/clkdev.h> |
a1391d27 | 30 | |
dbc04161 | 31 | #include "soc.h" |
32cc0021 | 32 | #include "clockdomain.h" |
a1391d27 | 33 | #include "clock.h" |
59fb659b | 34 | #include "cm2xxx_3xxx.h" |
a1391d27 RN |
35 | #include "cm-regbits-34xx.h" |
36 | ||
37 | /* CM_AUTOIDLE_PLL*.AUTO_* bit values */ | |
38 | #define DPLL_AUTOIDLE_DISABLE 0x0 | |
39 | #define DPLL_AUTOIDLE_LOW_POWER_STOP 0x1 | |
40 | ||
41 | #define MAX_DPLL_WAIT_TRIES 1000000 | |
42 | ||
60c3f651 | 43 | /* Private functions */ |
a1391d27 RN |
44 | |
45 | /* _omap3_dpll_write_clken - write clken_bits arg to a DPLL's enable bits */ | |
32cc0021 | 46 | static void _omap3_dpll_write_clken(struct clk_hw_omap *clk, u8 clken_bits) |
a1391d27 RN |
47 | { |
48 | const struct dpll_data *dd; | |
49 | u32 v; | |
50 | ||
51 | dd = clk->dpll_data; | |
52 | ||
519ab8b2 | 53 | v = omap2_clk_readl(clk, dd->control_reg); |
a1391d27 RN |
54 | v &= ~dd->enable_mask; |
55 | v |= clken_bits << __ffs(dd->enable_mask); | |
519ab8b2 | 56 | omap2_clk_writel(v, clk, dd->control_reg); |
a1391d27 RN |
57 | } |
58 | ||
59 | /* _omap3_wait_dpll_status: wait for a DPLL to enter a specific state */ | |
32cc0021 | 60 | static int _omap3_wait_dpll_status(struct clk_hw_omap *clk, u8 state) |
a1391d27 RN |
61 | { |
62 | const struct dpll_data *dd; | |
63 | int i = 0; | |
64 | int ret = -EINVAL; | |
5dcc3b97 | 65 | const char *clk_name; |
a1391d27 RN |
66 | |
67 | dd = clk->dpll_data; | |
32cc0021 | 68 | clk_name = __clk_get_name(clk->hw.clk); |
a1391d27 RN |
69 | |
70 | state <<= __ffs(dd->idlest_mask); | |
71 | ||
519ab8b2 TK |
72 | while (((omap2_clk_readl(clk, dd->idlest_reg) & dd->idlest_mask) |
73 | != state) && i < MAX_DPLL_WAIT_TRIES) { | |
a1391d27 RN |
74 | i++; |
75 | udelay(1); | |
76 | } | |
77 | ||
78 | if (i == MAX_DPLL_WAIT_TRIES) { | |
79 | printk(KERN_ERR "clock: %s failed transition to '%s'\n", | |
5dcc3b97 | 80 | clk_name, (state) ? "locked" : "bypassed"); |
a1391d27 RN |
81 | } else { |
82 | pr_debug("clock: %s transition to '%s' in %d loops\n", | |
5dcc3b97 | 83 | clk_name, (state) ? "locked" : "bypassed", i); |
a1391d27 RN |
84 | |
85 | ret = 0; | |
86 | } | |
87 | ||
88 | return ret; | |
89 | } | |
90 | ||
91 | /* From 3430 TRM ES2 4.7.6.2 */ | |
32cc0021 | 92 | static u16 _omap3_dpll_compute_freqsel(struct clk_hw_omap *clk, u8 n) |
a1391d27 RN |
93 | { |
94 | unsigned long fint; | |
95 | u16 f = 0; | |
96 | ||
5dcc3b97 | 97 | fint = __clk_get_rate(clk->dpll_data->clk_ref) / n; |
a1391d27 RN |
98 | |
99 | pr_debug("clock: fint is %lu\n", fint); | |
100 | ||
101 | if (fint >= 750000 && fint <= 1000000) | |
102 | f = 0x3; | |
103 | else if (fint > 1000000 && fint <= 1250000) | |
104 | f = 0x4; | |
105 | else if (fint > 1250000 && fint <= 1500000) | |
106 | f = 0x5; | |
107 | else if (fint > 1500000 && fint <= 1750000) | |
108 | f = 0x6; | |
109 | else if (fint > 1750000 && fint <= 2100000) | |
110 | f = 0x7; | |
111 | else if (fint > 7500000 && fint <= 10000000) | |
112 | f = 0xB; | |
113 | else if (fint > 10000000 && fint <= 12500000) | |
114 | f = 0xC; | |
115 | else if (fint > 12500000 && fint <= 15000000) | |
116 | f = 0xD; | |
117 | else if (fint > 15000000 && fint <= 17500000) | |
118 | f = 0xE; | |
119 | else if (fint > 17500000 && fint <= 21000000) | |
120 | f = 0xF; | |
121 | else | |
122 | pr_debug("clock: unknown freqsel setting for %d\n", n); | |
123 | ||
124 | return f; | |
125 | } | |
126 | ||
a1391d27 RN |
127 | /* |
128 | * _omap3_noncore_dpll_lock - instruct a DPLL to lock and wait for readiness | |
129 | * @clk: pointer to a DPLL struct clk | |
130 | * | |
131 | * Instructs a non-CORE DPLL to lock. Waits for the DPLL to report | |
132 | * readiness before returning. Will save and restore the DPLL's | |
133 | * autoidle state across the enable, per the CDP code. If the DPLL | |
134 | * locked successfully, return 0; if the DPLL did not lock in the time | |
135 | * allotted, or DPLL3 was passed in, return -EINVAL. | |
136 | */ | |
32cc0021 | 137 | static int _omap3_noncore_dpll_lock(struct clk_hw_omap *clk) |
a1391d27 | 138 | { |
55ffe163 | 139 | const struct dpll_data *dd; |
a1391d27 | 140 | u8 ai; |
55ffe163 VP |
141 | u8 state = 1; |
142 | int r = 0; | |
a1391d27 | 143 | |
32cc0021 | 144 | pr_debug("clock: locking DPLL %s\n", __clk_get_name(clk->hw.clk)); |
a1391d27 | 145 | |
55ffe163 VP |
146 | dd = clk->dpll_data; |
147 | state <<= __ffs(dd->idlest_mask); | |
148 | ||
149 | /* Check if already locked */ | |
519ab8b2 | 150 | if ((omap2_clk_readl(clk, dd->idlest_reg) & dd->idlest_mask) == state) |
55ffe163 VP |
151 | goto done; |
152 | ||
a1391d27 RN |
153 | ai = omap3_dpll_autoidle_read(clk); |
154 | ||
d76316fe VB |
155 | if (ai) |
156 | omap3_dpll_deny_idle(clk); | |
a1391d27 RN |
157 | |
158 | _omap3_dpll_write_clken(clk, DPLL_LOCKED); | |
159 | ||
160 | r = _omap3_wait_dpll_status(clk, 1); | |
161 | ||
162 | if (ai) | |
163 | omap3_dpll_allow_idle(clk); | |
164 | ||
55ffe163 | 165 | done: |
a1391d27 RN |
166 | return r; |
167 | } | |
168 | ||
169 | /* | |
170 | * _omap3_noncore_dpll_bypass - instruct a DPLL to bypass and wait for readiness | |
171 | * @clk: pointer to a DPLL struct clk | |
172 | * | |
173 | * Instructs a non-CORE DPLL to enter low-power bypass mode. In | |
174 | * bypass mode, the DPLL's rate is set equal to its parent clock's | |
175 | * rate. Waits for the DPLL to report readiness before returning. | |
176 | * Will save and restore the DPLL's autoidle state across the enable, | |
177 | * per the CDP code. If the DPLL entered bypass mode successfully, | |
178 | * return 0; if the DPLL did not enter bypass in the time allotted, or | |
179 | * DPLL3 was passed in, or the DPLL does not support low-power bypass, | |
180 | * return -EINVAL. | |
181 | */ | |
32cc0021 | 182 | static int _omap3_noncore_dpll_bypass(struct clk_hw_omap *clk) |
a1391d27 RN |
183 | { |
184 | int r; | |
185 | u8 ai; | |
186 | ||
187 | if (!(clk->dpll_data->modes & (1 << DPLL_LOW_POWER_BYPASS))) | |
188 | return -EINVAL; | |
189 | ||
190 | pr_debug("clock: configuring DPLL %s for low-power bypass\n", | |
32cc0021 | 191 | __clk_get_name(clk->hw.clk)); |
a1391d27 RN |
192 | |
193 | ai = omap3_dpll_autoidle_read(clk); | |
194 | ||
195 | _omap3_dpll_write_clken(clk, DPLL_LOW_POWER_BYPASS); | |
196 | ||
197 | r = _omap3_wait_dpll_status(clk, 0); | |
198 | ||
199 | if (ai) | |
200 | omap3_dpll_allow_idle(clk); | |
a1391d27 RN |
201 | |
202 | return r; | |
203 | } | |
204 | ||
205 | /* | |
206 | * _omap3_noncore_dpll_stop - instruct a DPLL to stop | |
207 | * @clk: pointer to a DPLL struct clk | |
208 | * | |
209 | * Instructs a non-CORE DPLL to enter low-power stop. Will save and | |
210 | * restore the DPLL's autoidle state across the stop, per the CDP | |
211 | * code. If DPLL3 was passed in, or the DPLL does not support | |
212 | * low-power stop, return -EINVAL; otherwise, return 0. | |
213 | */ | |
32cc0021 | 214 | static int _omap3_noncore_dpll_stop(struct clk_hw_omap *clk) |
a1391d27 RN |
215 | { |
216 | u8 ai; | |
217 | ||
218 | if (!(clk->dpll_data->modes & (1 << DPLL_LOW_POWER_STOP))) | |
219 | return -EINVAL; | |
220 | ||
32cc0021 | 221 | pr_debug("clock: stopping DPLL %s\n", __clk_get_name(clk->hw.clk)); |
a1391d27 RN |
222 | |
223 | ai = omap3_dpll_autoidle_read(clk); | |
224 | ||
225 | _omap3_dpll_write_clken(clk, DPLL_LOW_POWER_STOP); | |
226 | ||
227 | if (ai) | |
228 | omap3_dpll_allow_idle(clk); | |
a1391d27 RN |
229 | |
230 | return 0; | |
231 | } | |
232 | ||
358965d7 | 233 | /** |
a36795c1 | 234 | * _lookup_dco - Lookup DCO used by j-type DPLL |
358965d7 RW |
235 | * @clk: pointer to a DPLL struct clk |
236 | * @dco: digital control oscillator selector | |
358965d7 RW |
237 | * @m: DPLL multiplier to set |
238 | * @n: DPLL divider to set | |
239 | * | |
240 | * See 36xx TRM section 3.5.3.3.3.2 "Type B DPLL (Low-Jitter)" | |
241 | * | |
242 | * XXX This code is not needed for 3430/AM35xx; can it be optimized | |
243 | * out in non-multi-OMAP builds for those chips? | |
244 | */ | |
32cc0021 | 245 | static void _lookup_dco(struct clk_hw_omap *clk, u8 *dco, u16 m, u8 n) |
358965d7 | 246 | { |
a36795c1 | 247 | unsigned long fint, clkinp; /* watch out for overflow */ |
358965d7 | 248 | |
32cc0021 | 249 | clkinp = __clk_get_rate(__clk_get_parent(clk->hw.clk)); |
358965d7 RW |
250 | fint = (clkinp / n) * m; |
251 | ||
252 | if (fint < 1000000000) | |
253 | *dco = 2; | |
254 | else | |
255 | *dco = 4; | |
a36795c1 JH |
256 | } |
257 | ||
258 | /** | |
259 | * _lookup_sddiv - Calculate sigma delta divider for j-type DPLL | |
260 | * @clk: pointer to a DPLL struct clk | |
261 | * @sd_div: target sigma-delta divider | |
262 | * @m: DPLL multiplier to set | |
263 | * @n: DPLL divider to set | |
264 | * | |
265 | * See 36xx TRM section 3.5.3.3.3.2 "Type B DPLL (Low-Jitter)" | |
266 | * | |
267 | * XXX This code is not needed for 3430/AM35xx; can it be optimized | |
268 | * out in non-multi-OMAP builds for those chips? | |
269 | */ | |
32cc0021 | 270 | static void _lookup_sddiv(struct clk_hw_omap *clk, u8 *sd_div, u16 m, u8 n) |
a36795c1 JH |
271 | { |
272 | unsigned long clkinp, sd; /* watch out for overflow */ | |
273 | int mod1, mod2; | |
274 | ||
32cc0021 | 275 | clkinp = __clk_get_rate(__clk_get_parent(clk->hw.clk)); |
a36795c1 | 276 | |
358965d7 RW |
277 | /* |
278 | * target sigma-delta to near 250MHz | |
279 | * sd = ceil[(m/(n+1)) * (clkinp_MHz / 250)] | |
280 | */ | |
281 | clkinp /= 100000; /* shift from MHz to 10*Hz for 38.4 and 19.2 */ | |
282 | mod1 = (clkinp * m) % (250 * n); | |
283 | sd = (clkinp * m) / (250 * n); | |
284 | mod2 = sd % 10; | |
285 | sd /= 10; | |
286 | ||
287 | if (mod1 || mod2) | |
288 | sd++; | |
289 | *sd_div = sd; | |
290 | } | |
291 | ||
60c3f651 PW |
292 | /* |
293 | * _omap3_noncore_dpll_program - set non-core DPLL M,N values directly | |
3ff51ed8 JH |
294 | * @clk: struct clk * of DPLL to set |
295 | * @freqsel: FREQSEL value to set | |
60c3f651 | 296 | * |
3ff51ed8 JH |
297 | * Program the DPLL with the last M, N values calculated, and wait for |
298 | * the DPLL to lock. Returns -EINVAL upon error, or 0 upon success. | |
60c3f651 | 299 | */ |
3ff51ed8 | 300 | static int omap3_noncore_dpll_program(struct clk_hw_omap *clk, u16 freqsel) |
60c3f651 PW |
301 | { |
302 | struct dpll_data *dd = clk->dpll_data; | |
a36795c1 | 303 | u8 dco, sd_div; |
60c3f651 PW |
304 | u32 v; |
305 | ||
306 | /* 3430 ES2 TRM: 4.7.6.9 DPLL Programming Sequence */ | |
307 | _omap3_noncore_dpll_bypass(clk); | |
308 | ||
5eb75f55 | 309 | /* |
ecf51648 RN |
310 | * Set jitter correction. Jitter correction applicable for OMAP343X |
311 | * only since freqsel field is no longer present on other devices. | |
5eb75f55 | 312 | */ |
ecf51648 | 313 | if (cpu_is_omap343x()) { |
519ab8b2 | 314 | v = omap2_clk_readl(clk, dd->control_reg); |
60c3f651 PW |
315 | v &= ~dd->freqsel_mask; |
316 | v |= freqsel << __ffs(dd->freqsel_mask); | |
519ab8b2 | 317 | omap2_clk_writel(v, clk, dd->control_reg); |
60c3f651 PW |
318 | } |
319 | ||
320 | /* Set DPLL multiplier, divider */ | |
519ab8b2 | 321 | v = omap2_clk_readl(clk, dd->mult_div1_reg); |
60c3f651 | 322 | v &= ~(dd->mult_mask | dd->div1_mask); |
3ff51ed8 JH |
323 | v |= dd->last_rounded_m << __ffs(dd->mult_mask); |
324 | v |= (dd->last_rounded_n - 1) << __ffs(dd->div1_mask); | |
358965d7 | 325 | |
a36795c1 JH |
326 | /* Configure dco and sd_div for dplls that have these fields */ |
327 | if (dd->dco_mask) { | |
3ff51ed8 | 328 | _lookup_dco(clk, &dco, dd->last_rounded_m, dd->last_rounded_n); |
a36795c1 JH |
329 | v &= ~(dd->dco_mask); |
330 | v |= dco << __ffs(dd->dco_mask); | |
331 | } | |
332 | if (dd->sddiv_mask) { | |
3ff51ed8 JH |
333 | _lookup_sddiv(clk, &sd_div, dd->last_rounded_m, |
334 | dd->last_rounded_n); | |
a36795c1 JH |
335 | v &= ~(dd->sddiv_mask); |
336 | v |= sd_div << __ffs(dd->sddiv_mask); | |
358965d7 RW |
337 | } |
338 | ||
519ab8b2 | 339 | omap2_clk_writel(v, clk, dd->mult_div1_reg); |
60c3f651 | 340 | |
3ff51ed8 JH |
341 | /* Set 4X multiplier and low-power mode */ |
342 | if (dd->m4xen_mask || dd->lpmode_mask) { | |
519ab8b2 | 343 | v = omap2_clk_readl(clk, dd->control_reg); |
3ff51ed8 JH |
344 | |
345 | if (dd->m4xen_mask) { | |
346 | if (dd->last_rounded_m4xen) | |
347 | v |= dd->m4xen_mask; | |
348 | else | |
349 | v &= ~dd->m4xen_mask; | |
350 | } | |
351 | ||
352 | if (dd->lpmode_mask) { | |
353 | if (dd->last_rounded_lpmode) | |
354 | v |= dd->lpmode_mask; | |
355 | else | |
356 | v &= ~dd->lpmode_mask; | |
357 | } | |
358 | ||
519ab8b2 | 359 | omap2_clk_writel(v, clk, dd->control_reg); |
3ff51ed8 JH |
360 | } |
361 | ||
60c3f651 PW |
362 | /* We let the clock framework set the other output dividers later */ |
363 | ||
364 | /* REVISIT: Set ramp-up delay? */ | |
365 | ||
366 | _omap3_noncore_dpll_lock(clk); | |
367 | ||
368 | return 0; | |
369 | } | |
370 | ||
371 | /* Public functions */ | |
372 | ||
373 | /** | |
374 | * omap3_dpll_recalc - recalculate DPLL rate | |
375 | * @clk: DPLL struct clk | |
376 | * | |
377 | * Recalculate and propagate the DPLL rate. | |
378 | */ | |
32cc0021 MT |
379 | unsigned long omap3_dpll_recalc(struct clk_hw *hw, unsigned long parent_rate) |
380 | { | |
381 | struct clk_hw_omap *clk = to_clk_hw_omap(hw); | |
455db9c9 | 382 | |
60c3f651 PW |
383 | return omap2_get_dpll_rate(clk); |
384 | } | |
385 | ||
386 | /* Non-CORE DPLL (e.g., DPLLs that do not control SDRC) clock functions */ | |
387 | ||
a1391d27 RN |
388 | /** |
389 | * omap3_noncore_dpll_enable - instruct a DPLL to enter bypass or lock mode | |
390 | * @clk: pointer to a DPLL struct clk | |
391 | * | |
392 | * Instructs a non-CORE DPLL to enable, e.g., to enter bypass or lock. | |
393 | * The choice of modes depends on the DPLL's programmed rate: if it is | |
394 | * the same as the DPLL's parent clock, it will enter bypass; | |
395 | * otherwise, it will enter lock. This code will wait for the DPLL to | |
396 | * indicate readiness before returning, unless the DPLL takes too long | |
397 | * to enter the target state. Intended to be used as the struct clk's | |
398 | * enable function. If DPLL3 was passed in, or the DPLL does not | |
399 | * support low-power stop, or if the DPLL took too long to enter | |
400 | * bypass or lock, return -EINVAL; otherwise, return 0. | |
401 | */ | |
32cc0021 MT |
402 | int omap3_noncore_dpll_enable(struct clk_hw *hw) |
403 | { | |
404 | struct clk_hw_omap *clk = to_clk_hw_omap(hw); | |
a1391d27 RN |
405 | int r; |
406 | struct dpll_data *dd; | |
5dcc3b97 | 407 | struct clk *parent; |
a1391d27 RN |
408 | |
409 | dd = clk->dpll_data; | |
410 | if (!dd) | |
411 | return -EINVAL; | |
412 | ||
32cc0021 MT |
413 | if (clk->clkdm) { |
414 | r = clkdm_clk_enable(clk->clkdm, hw->clk); | |
415 | if (r) { | |
416 | WARN(1, | |
417 | "%s: could not enable %s's clockdomain %s: %d\n", | |
418 | __func__, __clk_get_name(hw->clk), | |
419 | clk->clkdm->name, r); | |
420 | return r; | |
421 | } | |
422 | } | |
423 | ||
424 | parent = __clk_get_parent(hw->clk); | |
425 | ||
426 | if (__clk_get_rate(hw->clk) == __clk_get_rate(dd->clk_bypass)) { | |
5dcc3b97 | 427 | WARN_ON(parent != dd->clk_bypass); |
a1391d27 RN |
428 | r = _omap3_noncore_dpll_bypass(clk); |
429 | } else { | |
5dcc3b97 | 430 | WARN_ON(parent != dd->clk_ref); |
a1391d27 RN |
431 | r = _omap3_noncore_dpll_lock(clk); |
432 | } | |
32cc0021 | 433 | |
a1391d27 RN |
434 | return r; |
435 | } | |
436 | ||
437 | /** | |
438 | * omap3_noncore_dpll_disable - instruct a DPLL to enter low-power stop | |
439 | * @clk: pointer to a DPLL struct clk | |
440 | * | |
441 | * Instructs a non-CORE DPLL to enter low-power stop. This function is | |
442 | * intended for use in struct clkops. No return value. | |
443 | */ | |
32cc0021 MT |
444 | void omap3_noncore_dpll_disable(struct clk_hw *hw) |
445 | { | |
446 | struct clk_hw_omap *clk = to_clk_hw_omap(hw); | |
447 | ||
448 | _omap3_noncore_dpll_stop(clk); | |
449 | if (clk->clkdm) | |
450 | clkdm_clk_disable(clk->clkdm, hw->clk); | |
a1391d27 RN |
451 | } |
452 | ||
453 | ||
454 | /* Non-CORE DPLL rate set code */ | |
455 | ||
a1391d27 RN |
456 | /** |
457 | * omap3_noncore_dpll_set_rate - set non-core DPLL rate | |
458 | * @clk: struct clk * of DPLL to set | |
459 | * @rate: rounded target rate | |
460 | * | |
461 | * Set the DPLL CLKOUT to the target rate. If the DPLL can enter | |
462 | * low-power bypass, and the target rate is the bypass source clock | |
463 | * rate, then configure the DPLL for bypass. Otherwise, round the | |
464 | * target rate if it hasn't been done already, then program and lock | |
465 | * the DPLL. Returns -EINVAL upon error, or 0 upon success. | |
466 | */ | |
32cc0021 MT |
467 | int omap3_noncore_dpll_set_rate(struct clk_hw *hw, unsigned long rate, |
468 | unsigned long parent_rate) | |
469 | { | |
470 | struct clk_hw_omap *clk = to_clk_hw_omap(hw); | |
471 | struct clk *new_parent = NULL; | |
472 | u16 freqsel = 0; | |
473 | struct dpll_data *dd; | |
474 | int ret; | |
475 | ||
476 | if (!hw || !rate) | |
477 | return -EINVAL; | |
478 | ||
479 | dd = clk->dpll_data; | |
480 | if (!dd) | |
481 | return -EINVAL; | |
482 | ||
32cc0021 MT |
483 | if (__clk_get_rate(dd->clk_bypass) == rate && |
484 | (dd->modes & (1 << DPLL_LOW_POWER_BYPASS))) { | |
485 | pr_debug("%s: %s: set rate: entering bypass.\n", | |
486 | __func__, __clk_get_name(hw->clk)); | |
487 | ||
469d633d RN |
488 | __clk_prepare(dd->clk_bypass); |
489 | clk_enable(dd->clk_bypass); | |
32cc0021 MT |
490 | ret = _omap3_noncore_dpll_bypass(clk); |
491 | if (!ret) | |
492 | new_parent = dd->clk_bypass; | |
469d633d RN |
493 | clk_disable(dd->clk_bypass); |
494 | __clk_unprepare(dd->clk_bypass); | |
32cc0021 | 495 | } else { |
469d633d RN |
496 | __clk_prepare(dd->clk_ref); |
497 | clk_enable(dd->clk_ref); | |
498 | ||
32cc0021 MT |
499 | if (dd->last_rounded_rate != rate) |
500 | rate = __clk_round_rate(hw->clk, rate); | |
501 | ||
502 | if (dd->last_rounded_rate == 0) | |
503 | return -EINVAL; | |
504 | ||
ecf51648 RN |
505 | /* Freqsel is available only on OMAP343X devices */ |
506 | if (cpu_is_omap343x()) { | |
32cc0021 MT |
507 | freqsel = _omap3_dpll_compute_freqsel(clk, |
508 | dd->last_rounded_n); | |
f64d204b | 509 | WARN_ON(!freqsel); |
32cc0021 MT |
510 | } |
511 | ||
512 | pr_debug("%s: %s: set rate: locking rate to %lu.\n", | |
513 | __func__, __clk_get_name(hw->clk), rate); | |
514 | ||
3ff51ed8 | 515 | ret = omap3_noncore_dpll_program(clk, freqsel); |
32cc0021 MT |
516 | if (!ret) |
517 | new_parent = dd->clk_ref; | |
469d633d RN |
518 | clk_disable(dd->clk_ref); |
519 | __clk_unprepare(dd->clk_ref); | |
32cc0021 MT |
520 | } |
521 | /* | |
522 | * FIXME - this is all wrong. common code handles reparenting and | |
523 | * migrating prepare/enable counts. dplls should be a multiplexer | |
524 | * clock and this should be a set_parent operation so that all of that | |
525 | * stuff is inherited for free | |
526 | */ | |
527 | ||
528 | if (!ret) | |
529 | __clk_reparent(hw->clk, new_parent); | |
530 | ||
32cc0021 MT |
531 | return 0; |
532 | } | |
a1391d27 RN |
533 | |
534 | /* DPLL autoidle read/set code */ | |
535 | ||
536 | /** | |
537 | * omap3_dpll_autoidle_read - read a DPLL's autoidle bits | |
538 | * @clk: struct clk * of the DPLL to read | |
539 | * | |
540 | * Return the DPLL's autoidle bits, shifted down to bit 0. Returns | |
541 | * -EINVAL if passed a null pointer or if the struct clk does not | |
542 | * appear to refer to a DPLL. | |
543 | */ | |
32cc0021 | 544 | u32 omap3_dpll_autoidle_read(struct clk_hw_omap *clk) |
a1391d27 RN |
545 | { |
546 | const struct dpll_data *dd; | |
547 | u32 v; | |
548 | ||
549 | if (!clk || !clk->dpll_data) | |
550 | return -EINVAL; | |
551 | ||
552 | dd = clk->dpll_data; | |
553 | ||
d76316fe VB |
554 | if (!dd->autoidle_reg) |
555 | return -EINVAL; | |
556 | ||
519ab8b2 | 557 | v = omap2_clk_readl(clk, dd->autoidle_reg); |
a1391d27 RN |
558 | v &= dd->autoidle_mask; |
559 | v >>= __ffs(dd->autoidle_mask); | |
560 | ||
561 | return v; | |
562 | } | |
563 | ||
564 | /** | |
565 | * omap3_dpll_allow_idle - enable DPLL autoidle bits | |
566 | * @clk: struct clk * of the DPLL to operate on | |
567 | * | |
568 | * Enable DPLL automatic idle control. This automatic idle mode | |
569 | * switching takes effect only when the DPLL is locked, at least on | |
570 | * OMAP3430. The DPLL will enter low-power stop when its downstream | |
571 | * clocks are gated. No return value. | |
572 | */ | |
32cc0021 | 573 | void omap3_dpll_allow_idle(struct clk_hw_omap *clk) |
a1391d27 RN |
574 | { |
575 | const struct dpll_data *dd; | |
576 | u32 v; | |
577 | ||
578 | if (!clk || !clk->dpll_data) | |
579 | return; | |
580 | ||
581 | dd = clk->dpll_data; | |
582 | ||
455db9c9 | 583 | if (!dd->autoidle_reg) |
d76316fe | 584 | return; |
d76316fe | 585 | |
a1391d27 RN |
586 | /* |
587 | * REVISIT: CORE DPLL can optionally enter low-power bypass | |
588 | * by writing 0x5 instead of 0x1. Add some mechanism to | |
589 | * optionally enter this mode. | |
590 | */ | |
519ab8b2 | 591 | v = omap2_clk_readl(clk, dd->autoidle_reg); |
a1391d27 RN |
592 | v &= ~dd->autoidle_mask; |
593 | v |= DPLL_AUTOIDLE_LOW_POWER_STOP << __ffs(dd->autoidle_mask); | |
519ab8b2 | 594 | omap2_clk_writel(v, clk, dd->autoidle_reg); |
d76316fe | 595 | |
a1391d27 RN |
596 | } |
597 | ||
598 | /** | |
599 | * omap3_dpll_deny_idle - prevent DPLL from automatically idling | |
600 | * @clk: struct clk * of the DPLL to operate on | |
601 | * | |
602 | * Disable DPLL automatic idle control. No return value. | |
603 | */ | |
32cc0021 | 604 | void omap3_dpll_deny_idle(struct clk_hw_omap *clk) |
a1391d27 RN |
605 | { |
606 | const struct dpll_data *dd; | |
607 | u32 v; | |
608 | ||
609 | if (!clk || !clk->dpll_data) | |
610 | return; | |
611 | ||
612 | dd = clk->dpll_data; | |
613 | ||
455db9c9 | 614 | if (!dd->autoidle_reg) |
d76316fe | 615 | return; |
d76316fe | 616 | |
519ab8b2 | 617 | v = omap2_clk_readl(clk, dd->autoidle_reg); |
a1391d27 RN |
618 | v &= ~dd->autoidle_mask; |
619 | v |= DPLL_AUTOIDLE_DISABLE << __ffs(dd->autoidle_mask); | |
519ab8b2 | 620 | omap2_clk_writel(v, clk, dd->autoidle_reg); |
a1391d27 RN |
621 | |
622 | } | |
623 | ||
624 | /* Clock control for DPLL outputs */ | |
625 | ||
994c41ee TV |
626 | /* Find the parent DPLL for the given clkoutx2 clock */ |
627 | static struct clk_hw_omap *omap3_find_clkoutx2_dpll(struct clk_hw *hw) | |
628 | { | |
629 | struct clk_hw_omap *pclk = NULL; | |
630 | struct clk *parent; | |
631 | ||
632 | /* Walk up the parents of clk, looking for a DPLL */ | |
633 | do { | |
634 | do { | |
635 | parent = __clk_get_parent(hw->clk); | |
636 | hw = __clk_get_hw(parent); | |
637 | } while (hw && (__clk_get_flags(hw->clk) & CLK_IS_BASIC)); | |
638 | if (!hw) | |
639 | break; | |
640 | pclk = to_clk_hw_omap(hw); | |
641 | } while (pclk && !pclk->dpll_data); | |
642 | ||
643 | /* clk does not have a DPLL as a parent? error in the clock data */ | |
644 | if (!pclk) { | |
645 | WARN_ON(1); | |
646 | return NULL; | |
647 | } | |
648 | ||
649 | return pclk; | |
650 | } | |
651 | ||
a1391d27 RN |
652 | /** |
653 | * omap3_clkoutx2_recalc - recalculate DPLL X2 output virtual clock rate | |
654 | * @clk: DPLL output struct clk | |
655 | * | |
656 | * Using parent clock DPLL data, look up DPLL state. If locked, set our | |
657 | * rate to the dpll_clk * 2; otherwise, just use dpll_clk. | |
658 | */ | |
32cc0021 MT |
659 | unsigned long omap3_clkoutx2_recalc(struct clk_hw *hw, |
660 | unsigned long parent_rate) | |
661 | { | |
662 | const struct dpll_data *dd; | |
663 | unsigned long rate; | |
664 | u32 v; | |
665 | struct clk_hw_omap *pclk = NULL; | |
32cc0021 | 666 | |
519ab8b2 TK |
667 | if (!parent_rate) |
668 | return 0; | |
669 | ||
994c41ee | 670 | pclk = omap3_find_clkoutx2_dpll(hw); |
a1391d27 | 671 | |
994c41ee | 672 | if (!pclk) |
a032d33b | 673 | return 0; |
a1391d27 RN |
674 | |
675 | dd = pclk->dpll_data; | |
676 | ||
677 | WARN_ON(!dd->enable_mask); | |
678 | ||
519ab8b2 | 679 | v = omap2_clk_readl(pclk, dd->control_reg) & dd->enable_mask; |
a1391d27 | 680 | v >>= __ffs(dd->enable_mask); |
358965d7 | 681 | if ((v != OMAP3XXX_EN_DPLL_LOCKED) || (dd->flags & DPLL_J_TYPE)) |
5dcc3b97 | 682 | rate = parent_rate; |
a1391d27 | 683 | else |
5dcc3b97 | 684 | rate = parent_rate * 2; |
a1391d27 RN |
685 | return rate; |
686 | } | |
353cec46 | 687 | |
994c41ee TV |
688 | int omap3_clkoutx2_set_rate(struct clk_hw *hw, unsigned long rate, |
689 | unsigned long parent_rate) | |
690 | { | |
691 | return 0; | |
692 | } | |
693 | ||
694 | long omap3_clkoutx2_round_rate(struct clk_hw *hw, unsigned long rate, | |
695 | unsigned long *prate) | |
696 | { | |
697 | const struct dpll_data *dd; | |
698 | u32 v; | |
699 | struct clk_hw_omap *pclk = NULL; | |
700 | ||
701 | if (!*prate) | |
702 | return 0; | |
703 | ||
704 | pclk = omap3_find_clkoutx2_dpll(hw); | |
705 | ||
706 | if (!pclk) | |
707 | return 0; | |
708 | ||
709 | dd = pclk->dpll_data; | |
710 | ||
711 | /* TYPE J does not have a clkoutx2 */ | |
712 | if (dd->flags & DPLL_J_TYPE) { | |
713 | *prate = __clk_round_rate(__clk_get_parent(pclk->hw.clk), rate); | |
714 | return *prate; | |
715 | } | |
716 | ||
717 | WARN_ON(!dd->enable_mask); | |
718 | ||
719 | v = omap2_clk_readl(pclk, dd->control_reg) & dd->enable_mask; | |
720 | v >>= __ffs(dd->enable_mask); | |
721 | ||
722 | /* If in bypass, the rate is fixed to the bypass rate*/ | |
723 | if (v != OMAP3XXX_EN_DPLL_LOCKED) | |
724 | return *prate; | |
725 | ||
726 | if (__clk_get_flags(hw->clk) & CLK_SET_RATE_PARENT) { | |
727 | unsigned long best_parent; | |
728 | ||
729 | best_parent = (rate / 2); | |
730 | *prate = __clk_round_rate(__clk_get_parent(hw->clk), | |
731 | best_parent); | |
732 | } | |
733 | ||
734 | return *prate * 2; | |
735 | } | |
736 | ||
353cec46 | 737 | /* OMAP3/4 non-CORE DPLL clkops */ |
32cc0021 MT |
738 | const struct clk_hw_omap_ops clkhwops_omap3_dpll = { |
739 | .allow_idle = omap3_dpll_allow_idle, | |
740 | .deny_idle = omap3_dpll_deny_idle, | |
741 | }; |