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Commit | Line | Data |
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0a20170a TV |
1 | /* |
2 | * Copyright (C) 2014 Texas Instruments Incorporated | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License version 2 as published by | |
6 | * the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program. If not, see <http://www.gnu.org/licenses/>. | |
15 | */ | |
16 | ||
17 | #define DSS_SUBSYS_NAME "PLL" | |
18 | ||
19 | #include <linux/clk.h> | |
20 | #include <linux/io.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/regulator/consumer.h> | |
23 | #include <linux/sched.h> | |
24 | ||
32043da7 | 25 | #include "omapdss.h" |
0a20170a TV |
26 | #include "dss.h" |
27 | ||
28 | #define PLL_CONTROL 0x0000 | |
29 | #define PLL_STATUS 0x0004 | |
30 | #define PLL_GO 0x0008 | |
31 | #define PLL_CONFIGURATION1 0x000C | |
32 | #define PLL_CONFIGURATION2 0x0010 | |
33 | #define PLL_CONFIGURATION3 0x0014 | |
34 | #define PLL_SSC_CONFIGURATION1 0x0018 | |
35 | #define PLL_SSC_CONFIGURATION2 0x001C | |
36 | #define PLL_CONFIGURATION4 0x0020 | |
37 | ||
38 | static struct dss_pll *dss_plls[4]; | |
39 | ||
40 | int dss_pll_register(struct dss_pll *pll) | |
41 | { | |
42 | int i; | |
43 | ||
44 | for (i = 0; i < ARRAY_SIZE(dss_plls); ++i) { | |
45 | if (!dss_plls[i]) { | |
46 | dss_plls[i] = pll; | |
47 | return 0; | |
48 | } | |
49 | } | |
50 | ||
51 | return -EBUSY; | |
52 | } | |
53 | ||
54 | void dss_pll_unregister(struct dss_pll *pll) | |
55 | { | |
56 | int i; | |
57 | ||
58 | for (i = 0; i < ARRAY_SIZE(dss_plls); ++i) { | |
59 | if (dss_plls[i] == pll) { | |
60 | dss_plls[i] = NULL; | |
61 | return; | |
62 | } | |
63 | } | |
64 | } | |
65 | ||
66 | struct dss_pll *dss_pll_find(const char *name) | |
67 | { | |
68 | int i; | |
69 | ||
70 | for (i = 0; i < ARRAY_SIZE(dss_plls); ++i) { | |
71 | if (dss_plls[i] && strcmp(dss_plls[i]->name, name) == 0) | |
72 | return dss_plls[i]; | |
73 | } | |
74 | ||
75 | return NULL; | |
76 | } | |
77 | ||
5670bd72 TV |
78 | struct dss_pll *dss_pll_find_by_src(enum dss_clk_source src) |
79 | { | |
80 | struct dss_pll *pll; | |
81 | ||
82 | switch (src) { | |
83 | default: | |
84 | case DSS_CLK_SRC_FCK: | |
85 | return NULL; | |
86 | ||
87 | case DSS_CLK_SRC_HDMI_PLL: | |
88 | return dss_pll_find("hdmi"); | |
89 | ||
90 | case DSS_CLK_SRC_PLL1_1: | |
91 | case DSS_CLK_SRC_PLL1_2: | |
92 | case DSS_CLK_SRC_PLL1_3: | |
93 | pll = dss_pll_find("dsi0"); | |
94 | if (!pll) | |
95 | pll = dss_pll_find("video0"); | |
96 | return pll; | |
97 | ||
98 | case DSS_CLK_SRC_PLL2_1: | |
99 | case DSS_CLK_SRC_PLL2_2: | |
100 | case DSS_CLK_SRC_PLL2_3: | |
101 | pll = dss_pll_find("dsi1"); | |
102 | if (!pll) | |
103 | pll = dss_pll_find("video1"); | |
104 | return pll; | |
105 | } | |
106 | } | |
107 | ||
108 | unsigned dss_pll_get_clkout_idx_for_src(enum dss_clk_source src) | |
109 | { | |
110 | switch (src) { | |
111 | case DSS_CLK_SRC_HDMI_PLL: | |
112 | return 0; | |
113 | ||
114 | case DSS_CLK_SRC_PLL1_1: | |
115 | case DSS_CLK_SRC_PLL2_1: | |
116 | return 0; | |
117 | ||
118 | case DSS_CLK_SRC_PLL1_2: | |
119 | case DSS_CLK_SRC_PLL2_2: | |
120 | return 1; | |
121 | ||
122 | case DSS_CLK_SRC_PLL1_3: | |
123 | case DSS_CLK_SRC_PLL2_3: | |
124 | return 2; | |
125 | ||
126 | default: | |
127 | return 0; | |
128 | } | |
129 | } | |
130 | ||
0a20170a TV |
131 | int dss_pll_enable(struct dss_pll *pll) |
132 | { | |
133 | int r; | |
134 | ||
135 | r = clk_prepare_enable(pll->clkin); | |
136 | if (r) | |
137 | return r; | |
138 | ||
139 | if (pll->regulator) { | |
140 | r = regulator_enable(pll->regulator); | |
141 | if (r) | |
142 | goto err_reg; | |
143 | } | |
144 | ||
145 | r = pll->ops->enable(pll); | |
146 | if (r) | |
147 | goto err_enable; | |
148 | ||
149 | return 0; | |
150 | ||
151 | err_enable: | |
811174f4 DC |
152 | if (pll->regulator) |
153 | regulator_disable(pll->regulator); | |
0a20170a TV |
154 | err_reg: |
155 | clk_disable_unprepare(pll->clkin); | |
156 | return r; | |
157 | } | |
158 | ||
159 | void dss_pll_disable(struct dss_pll *pll) | |
160 | { | |
161 | pll->ops->disable(pll); | |
162 | ||
163 | if (pll->regulator) | |
164 | regulator_disable(pll->regulator); | |
165 | ||
166 | clk_disable_unprepare(pll->clkin); | |
167 | ||
168 | memset(&pll->cinfo, 0, sizeof(pll->cinfo)); | |
169 | } | |
170 | ||
171 | int dss_pll_set_config(struct dss_pll *pll, const struct dss_pll_clock_info *cinfo) | |
172 | { | |
173 | int r; | |
174 | ||
175 | r = pll->ops->set_config(pll, cinfo); | |
176 | if (r) | |
177 | return r; | |
178 | ||
179 | pll->cinfo = *cinfo; | |
180 | ||
181 | return 0; | |
182 | } | |
183 | ||
cd0715ff | 184 | bool dss_pll_hsdiv_calc_a(const struct dss_pll *pll, unsigned long clkdco, |
0a20170a TV |
185 | unsigned long out_min, unsigned long out_max, |
186 | dss_hsdiv_calc_func func, void *data) | |
187 | { | |
188 | const struct dss_pll_hw *hw = pll->hw; | |
189 | int m, m_start, m_stop; | |
190 | unsigned long out; | |
191 | ||
192 | out_min = out_min ? out_min : 1; | |
193 | out_max = out_max ? out_max : ULONG_MAX; | |
194 | ||
195 | m_start = max(DIV_ROUND_UP(clkdco, out_max), 1ul); | |
196 | ||
197 | m_stop = min((unsigned)(clkdco / out_min), hw->mX_max); | |
198 | ||
199 | for (m = m_start; m <= m_stop; ++m) { | |
200 | out = clkdco / m; | |
201 | ||
202 | if (func(m, out, data)) | |
203 | return true; | |
204 | } | |
205 | ||
206 | return false; | |
207 | } | |
208 | ||
f44b717c TV |
209 | /* |
210 | * clkdco = clkin / n * m * 2 | |
211 | * clkoutX = clkdco / mX | |
212 | */ | |
cd0715ff | 213 | bool dss_pll_calc_a(const struct dss_pll *pll, unsigned long clkin, |
0a20170a TV |
214 | unsigned long pll_min, unsigned long pll_max, |
215 | dss_pll_calc_func func, void *data) | |
216 | { | |
217 | const struct dss_pll_hw *hw = pll->hw; | |
7d267f06 TV |
218 | int n, n_min, n_max; |
219 | int m, m_min, m_max; | |
0a20170a TV |
220 | unsigned long fint, clkdco; |
221 | unsigned long pll_hw_max; | |
222 | unsigned long fint_hw_min, fint_hw_max; | |
223 | ||
224 | pll_hw_max = hw->clkdco_max; | |
225 | ||
226 | fint_hw_min = hw->fint_min; | |
227 | fint_hw_max = hw->fint_max; | |
228 | ||
7d267f06 TV |
229 | n_min = max(DIV_ROUND_UP(clkin, fint_hw_max), 1ul); |
230 | n_max = min((unsigned)(clkin / fint_hw_min), hw->n_max); | |
0a20170a TV |
231 | |
232 | pll_max = pll_max ? pll_max : ULONG_MAX; | |
233 | ||
7d267f06 TV |
234 | /* Try to find high N & M to avoid jitter (DRA7 errata i886) */ |
235 | for (n = n_max; n >= n_min; --n) { | |
0a20170a TV |
236 | fint = clkin / n; |
237 | ||
7d267f06 | 238 | m_min = max(DIV_ROUND_UP(DIV_ROUND_UP(pll_min, fint), 2), |
0a20170a | 239 | 1ul); |
7d267f06 | 240 | m_max = min3((unsigned)(pll_max / fint / 2), |
0a20170a TV |
241 | (unsigned)(pll_hw_max / fint / 2), |
242 | hw->m_max); | |
243 | ||
7d267f06 | 244 | for (m = m_max; m >= m_min; --m) { |
0a20170a TV |
245 | clkdco = 2 * m * fint; |
246 | ||
247 | if (func(n, m, fint, clkdco, data)) | |
248 | return true; | |
249 | } | |
250 | } | |
251 | ||
252 | return false; | |
253 | } | |
254 | ||
c107751d TV |
255 | /* |
256 | * This calculates a PLL config that will provide the target_clkout rate | |
257 | * for clkout. Additionally clkdco rate will be the same as clkout rate | |
258 | * when clkout rate is >= min_clkdco. | |
f44b717c TV |
259 | * |
260 | * clkdco = clkin / n * m + clkin / n * mf / 262144 | |
261 | * clkout = clkdco / m2 | |
c107751d | 262 | */ |
c17dc0e3 | 263 | bool dss_pll_calc_b(const struct dss_pll *pll, unsigned long clkin, |
c107751d | 264 | unsigned long target_clkout, struct dss_pll_clock_info *cinfo) |
c17dc0e3 TV |
265 | { |
266 | unsigned long fint, clkdco, clkout; | |
c107751d | 267 | unsigned long target_clkdco; |
c17dc0e3 TV |
268 | unsigned long min_dco; |
269 | unsigned n, m, mf, m2, sd; | |
270 | const struct dss_pll_hw *hw = pll->hw; | |
271 | ||
c107751d | 272 | DSSDBG("clkin %lu, target clkout %lu\n", clkin, target_clkout); |
c17dc0e3 TV |
273 | |
274 | /* Fint */ | |
275 | n = DIV_ROUND_UP(clkin, hw->fint_max); | |
276 | fint = clkin / n; | |
277 | ||
278 | /* adjust m2 so that the clkdco will be high enough */ | |
279 | min_dco = roundup(hw->clkdco_min, fint); | |
c107751d | 280 | m2 = DIV_ROUND_UP(min_dco, target_clkout); |
c17dc0e3 TV |
281 | if (m2 == 0) |
282 | m2 = 1; | |
283 | ||
c107751d | 284 | target_clkdco = target_clkout * m2; |
c17dc0e3 TV |
285 | m = target_clkdco / fint; |
286 | ||
287 | clkdco = fint * m; | |
288 | ||
289 | /* adjust clkdco with fractional mf */ | |
290 | if (WARN_ON(target_clkdco - clkdco > fint)) | |
291 | mf = 0; | |
292 | else | |
293 | mf = (u32)div_u64(262144ull * (target_clkdco - clkdco), fint); | |
294 | ||
295 | if (mf > 0) | |
296 | clkdco += (u32)div_u64((u64)mf * fint, 262144); | |
297 | ||
298 | clkout = clkdco / m2; | |
299 | ||
300 | /* sigma-delta */ | |
301 | sd = DIV_ROUND_UP(fint * m, 250000000); | |
302 | ||
303 | DSSDBG("N = %u, M = %u, M.f = %u, M2 = %u, SD = %u\n", | |
304 | n, m, mf, m2, sd); | |
305 | DSSDBG("Fint %lu, clkdco %lu, clkout %lu\n", fint, clkdco, clkout); | |
306 | ||
307 | cinfo->n = n; | |
308 | cinfo->m = m; | |
309 | cinfo->mf = mf; | |
310 | cinfo->mX[0] = m2; | |
311 | cinfo->sd = sd; | |
312 | ||
313 | cinfo->fint = fint; | |
314 | cinfo->clkdco = clkdco; | |
315 | cinfo->clkout[0] = clkout; | |
316 | ||
317 | return true; | |
318 | } | |
319 | ||
0a20170a TV |
320 | static int wait_for_bit_change(void __iomem *reg, int bitnum, int value) |
321 | { | |
322 | unsigned long timeout; | |
323 | ktime_t wait; | |
324 | int t; | |
325 | ||
326 | /* first busyloop to see if the bit changes right away */ | |
327 | t = 100; | |
328 | while (t-- > 0) { | |
329 | if (FLD_GET(readl_relaxed(reg), bitnum, bitnum) == value) | |
330 | return value; | |
331 | } | |
332 | ||
333 | /* then loop for 500ms, sleeping for 1ms in between */ | |
334 | timeout = jiffies + msecs_to_jiffies(500); | |
335 | while (time_before(jiffies, timeout)) { | |
336 | if (FLD_GET(readl_relaxed(reg), bitnum, bitnum) == value) | |
337 | return value; | |
338 | ||
339 | wait = ns_to_ktime(1000 * 1000); | |
340 | set_current_state(TASK_UNINTERRUPTIBLE); | |
341 | schedule_hrtimeout(&wait, HRTIMER_MODE_REL); | |
342 | } | |
343 | ||
344 | return !value; | |
345 | } | |
346 | ||
eb30199b TV |
347 | int dss_pll_wait_reset_done(struct dss_pll *pll) |
348 | { | |
349 | void __iomem *base = pll->base; | |
350 | ||
351 | if (wait_for_bit_change(base + PLL_STATUS, 0, 1) != 1) | |
352 | return -ETIMEDOUT; | |
353 | else | |
354 | return 0; | |
355 | } | |
356 | ||
0a20170a TV |
357 | static int dss_wait_hsdiv_ack(struct dss_pll *pll, u32 hsdiv_ack_mask) |
358 | { | |
359 | int t = 100; | |
360 | ||
361 | while (t-- > 0) { | |
362 | u32 v = readl_relaxed(pll->base + PLL_STATUS); | |
363 | v &= hsdiv_ack_mask; | |
364 | if (v == hsdiv_ack_mask) | |
365 | return 0; | |
366 | } | |
367 | ||
368 | return -ETIMEDOUT; | |
369 | } | |
370 | ||
371 | int dss_pll_write_config_type_a(struct dss_pll *pll, | |
372 | const struct dss_pll_clock_info *cinfo) | |
373 | { | |
374 | const struct dss_pll_hw *hw = pll->hw; | |
375 | void __iomem *base = pll->base; | |
376 | int r = 0; | |
377 | u32 l; | |
378 | ||
379 | l = 0; | |
380 | if (hw->has_stopmode) | |
381 | l = FLD_MOD(l, 1, 0, 0); /* PLL_STOPMODE */ | |
382 | l = FLD_MOD(l, cinfo->n - 1, hw->n_msb, hw->n_lsb); /* PLL_REGN */ | |
383 | l = FLD_MOD(l, cinfo->m, hw->m_msb, hw->m_lsb); /* PLL_REGM */ | |
384 | /* M4 */ | |
385 | l = FLD_MOD(l, cinfo->mX[0] ? cinfo->mX[0] - 1 : 0, | |
386 | hw->mX_msb[0], hw->mX_lsb[0]); | |
387 | /* M5 */ | |
388 | l = FLD_MOD(l, cinfo->mX[1] ? cinfo->mX[1] - 1 : 0, | |
389 | hw->mX_msb[1], hw->mX_lsb[1]); | |
390 | writel_relaxed(l, base + PLL_CONFIGURATION1); | |
391 | ||
392 | l = 0; | |
393 | /* M6 */ | |
394 | l = FLD_MOD(l, cinfo->mX[2] ? cinfo->mX[2] - 1 : 0, | |
395 | hw->mX_msb[2], hw->mX_lsb[2]); | |
396 | /* M7 */ | |
397 | l = FLD_MOD(l, cinfo->mX[3] ? cinfo->mX[3] - 1 : 0, | |
398 | hw->mX_msb[3], hw->mX_lsb[3]); | |
399 | writel_relaxed(l, base + PLL_CONFIGURATION3); | |
400 | ||
401 | l = readl_relaxed(base + PLL_CONFIGURATION2); | |
402 | if (hw->has_freqsel) { | |
403 | u32 f = cinfo->fint < 1000000 ? 0x3 : | |
404 | cinfo->fint < 1250000 ? 0x4 : | |
405 | cinfo->fint < 1500000 ? 0x5 : | |
406 | cinfo->fint < 1750000 ? 0x6 : | |
407 | 0x7; | |
408 | ||
409 | l = FLD_MOD(l, f, 4, 1); /* PLL_FREQSEL */ | |
410 | } else if (hw->has_selfreqdco) { | |
411 | u32 f = cinfo->clkdco < hw->clkdco_low ? 0x2 : 0x4; | |
412 | ||
413 | l = FLD_MOD(l, f, 3, 1); /* PLL_SELFREQDCO */ | |
414 | } | |
415 | l = FLD_MOD(l, 1, 13, 13); /* PLL_REFEN */ | |
416 | l = FLD_MOD(l, 0, 14, 14); /* PHY_CLKINEN */ | |
417 | l = FLD_MOD(l, 0, 16, 16); /* M4_CLOCK_EN */ | |
418 | l = FLD_MOD(l, 0, 18, 18); /* M5_CLOCK_EN */ | |
419 | l = FLD_MOD(l, 1, 20, 20); /* HSDIVBYPASS */ | |
420 | if (hw->has_refsel) | |
421 | l = FLD_MOD(l, 3, 22, 21); /* REFSEL = sysclk */ | |
422 | l = FLD_MOD(l, 0, 23, 23); /* M6_CLOCK_EN */ | |
423 | l = FLD_MOD(l, 0, 25, 25); /* M7_CLOCK_EN */ | |
424 | writel_relaxed(l, base + PLL_CONFIGURATION2); | |
425 | ||
426 | writel_relaxed(1, base + PLL_GO); /* PLL_GO */ | |
427 | ||
428 | if (wait_for_bit_change(base + PLL_GO, 0, 0) != 0) { | |
429 | DSSERR("DSS DPLL GO bit not going down.\n"); | |
430 | r = -EIO; | |
431 | goto err; | |
432 | } | |
433 | ||
434 | if (wait_for_bit_change(base + PLL_STATUS, 1, 1) != 1) { | |
435 | DSSERR("cannot lock DSS DPLL\n"); | |
436 | r = -EIO; | |
437 | goto err; | |
438 | } | |
439 | ||
440 | l = readl_relaxed(base + PLL_CONFIGURATION2); | |
441 | l = FLD_MOD(l, 1, 14, 14); /* PHY_CLKINEN */ | |
442 | l = FLD_MOD(l, cinfo->mX[0] ? 1 : 0, 16, 16); /* M4_CLOCK_EN */ | |
443 | l = FLD_MOD(l, cinfo->mX[1] ? 1 : 0, 18, 18); /* M5_CLOCK_EN */ | |
444 | l = FLD_MOD(l, 0, 20, 20); /* HSDIVBYPASS */ | |
445 | l = FLD_MOD(l, cinfo->mX[2] ? 1 : 0, 23, 23); /* M6_CLOCK_EN */ | |
446 | l = FLD_MOD(l, cinfo->mX[3] ? 1 : 0, 25, 25); /* M7_CLOCK_EN */ | |
447 | writel_relaxed(l, base + PLL_CONFIGURATION2); | |
448 | ||
449 | r = dss_wait_hsdiv_ack(pll, | |
450 | (cinfo->mX[0] ? BIT(7) : 0) | | |
451 | (cinfo->mX[1] ? BIT(8) : 0) | | |
452 | (cinfo->mX[2] ? BIT(10) : 0) | | |
453 | (cinfo->mX[3] ? BIT(11) : 0)); | |
454 | if (r) { | |
455 | DSSERR("failed to enable HSDIV clocks\n"); | |
456 | goto err; | |
457 | } | |
458 | ||
459 | err: | |
460 | return r; | |
461 | } | |
462 | ||
463 | int dss_pll_write_config_type_b(struct dss_pll *pll, | |
464 | const struct dss_pll_clock_info *cinfo) | |
465 | { | |
466 | const struct dss_pll_hw *hw = pll->hw; | |
467 | void __iomem *base = pll->base; | |
468 | u32 l; | |
469 | ||
470 | l = 0; | |
471 | l = FLD_MOD(l, cinfo->m, 20, 9); /* PLL_REGM */ | |
472 | l = FLD_MOD(l, cinfo->n - 1, 8, 1); /* PLL_REGN */ | |
473 | writel_relaxed(l, base + PLL_CONFIGURATION1); | |
474 | ||
475 | l = readl_relaxed(base + PLL_CONFIGURATION2); | |
476 | l = FLD_MOD(l, 0x0, 12, 12); /* PLL_HIGHFREQ divide by 2 */ | |
477 | l = FLD_MOD(l, 0x1, 13, 13); /* PLL_REFEN */ | |
478 | l = FLD_MOD(l, 0x0, 14, 14); /* PHY_CLKINEN */ | |
479 | if (hw->has_refsel) | |
480 | l = FLD_MOD(l, 0x3, 22, 21); /* REFSEL = SYSCLK */ | |
481 | ||
482 | /* PLL_SELFREQDCO */ | |
483 | if (cinfo->clkdco > hw->clkdco_low) | |
484 | l = FLD_MOD(l, 0x4, 3, 1); | |
485 | else | |
486 | l = FLD_MOD(l, 0x2, 3, 1); | |
487 | writel_relaxed(l, base + PLL_CONFIGURATION2); | |
488 | ||
489 | l = readl_relaxed(base + PLL_CONFIGURATION3); | |
490 | l = FLD_MOD(l, cinfo->sd, 17, 10); /* PLL_REGSD */ | |
491 | writel_relaxed(l, base + PLL_CONFIGURATION3); | |
492 | ||
493 | l = readl_relaxed(base + PLL_CONFIGURATION4); | |
494 | l = FLD_MOD(l, cinfo->mX[0], 24, 18); /* PLL_REGM2 */ | |
495 | l = FLD_MOD(l, cinfo->mf, 17, 0); /* PLL_REGM_F */ | |
496 | writel_relaxed(l, base + PLL_CONFIGURATION4); | |
497 | ||
498 | writel_relaxed(1, base + PLL_GO); /* PLL_GO */ | |
499 | ||
500 | if (wait_for_bit_change(base + PLL_GO, 0, 0) != 0) { | |
501 | DSSERR("DSS DPLL GO bit not going down.\n"); | |
502 | return -EIO; | |
503 | } | |
504 | ||
505 | if (wait_for_bit_change(base + PLL_STATUS, 1, 1) != 1) { | |
506 | DSSERR("cannot lock DSS DPLL\n"); | |
507 | return -ETIMEDOUT; | |
508 | } | |
509 | ||
510 | return 0; | |
511 | } |