1 | /* |
2 | * Driver for TI Multi PLL CDCE913/925/937/949 clock synthesizer |
3 | * |
4 | * This driver always connects the Y1 to the input clock, Y2/Y3 to PLL1, |
5 | * Y4/Y5 to PLL2, and so on. PLL frequency is set on a first-come-first-serve |
6 | * basis. Clients can directly request any frequency that the chip can |
7 | * deliver using the standard clk framework. In addition, the device can |
8 | * be configured and activated via the devicetree. |
9 | * |
10 | * Copyright (C) 2014, Topic Embedded Products |
11 | * Licenced under GPL |
12 | */ |
13 | #include <linux/clk.h> |
14 | #include <linux/clk-provider.h> |
15 | #include <linux/delay.h> |
16 | #include <linux/module.h> |
17 | #include <linux/i2c.h> |
18 | #include <linux/regmap.h> |
19 | #include <linux/regulator/consumer.h> |
20 | #include <linux/slab.h> |
21 | #include <linux/gcd.h> |
22 | |
23 | /* Each chip has different number of PLLs and outputs, for example: |
24 | * The CECE925 has 2 PLLs which can be routed through dividers to 5 outputs. |
25 | * Model this as 2 PLL clocks which are parents to the outputs. |
26 | */ |
27 | |
28 | struct clk_cdce925_chip_info { |
29 | int num_plls; |
30 | int num_outputs; |
31 | }; |
32 | |
33 | #define MAX_NUMBER_OF_PLLS 4 |
34 | #define MAX_NUMBER_OF_OUTPUTS 9 |
35 | |
36 | #define CDCE925_REG_GLOBAL1 0x01 |
37 | #define CDCE925_REG_Y1SPIPDIVH 0x02 |
38 | #define CDCE925_REG_PDIVL 0x03 |
39 | #define CDCE925_REG_XCSEL 0x05 |
40 | /* PLL parameters start at 0x10, steps of 0x10 */ |
41 | #define CDCE925_OFFSET_PLL 0x10 |
42 | /* Add CDCE925_OFFSET_PLL * (pll) to these registers before sending */ |
43 | #define CDCE925_PLL_MUX_OUTPUTS 0x14 |
44 | #define CDCE925_PLL_MULDIV 0x18 |
45 | |
46 | #define CDCE925_PLL_FREQUENCY_MIN 80000000ul |
47 | #define CDCE925_PLL_FREQUENCY_MAX 230000000ul |
48 | struct clk_cdce925_chip; |
49 | |
50 | struct clk_cdce925_output { |
51 | struct clk_hw hw; |
52 | struct clk_cdce925_chip *chip; |
53 | u8 index; |
54 | u16 pdiv; /* 1..127 for Y2-Y9; 1..1023 for Y1 */ |
55 | }; |
56 | #define to_clk_cdce925_output(_hw) \ |
57 | container_of(_hw, struct clk_cdce925_output, hw) |
58 | |
59 | struct clk_cdce925_pll { |
60 | struct clk_hw hw; |
61 | struct clk_cdce925_chip *chip; |
62 | u8 index; |
63 | u16 m; /* 1..511 */ |
64 | u16 n; /* 1..4095 */ |
65 | }; |
66 | #define to_clk_cdce925_pll(_hw) container_of(_hw, struct clk_cdce925_pll, hw) |
67 | |
68 | struct clk_cdce925_chip { |
69 | struct regmap *regmap; |
70 | struct i2c_client *i2c_client; |
71 | const struct clk_cdce925_chip_info *chip_info; |
72 | struct clk_cdce925_pll pll[MAX_NUMBER_OF_PLLS]; |
73 | struct clk_cdce925_output clk[MAX_NUMBER_OF_OUTPUTS]; |
74 | }; |
75 | |
76 | /* ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** */ |
77 | |
78 | static unsigned long cdce925_pll_calculate_rate(unsigned long parent_rate, |
79 | u16 n, u16 m) |
80 | { |
81 | if ((!m || !n) || (m == n)) |
82 | return parent_rate; /* In bypass mode runs at same frequency */ |
83 | return mult_frac(parent_rate, (unsigned long)n, (unsigned long)m); |
84 | } |
85 | |
86 | static unsigned long cdce925_pll_recalc_rate(struct clk_hw *hw, |
87 | unsigned long parent_rate) |
88 | { |
89 | /* Output frequency of PLL is Fout = (Fin/Pdiv)*(N/M) */ |
90 | struct clk_cdce925_pll *data = to_clk_cdce925_pll(hw); |
91 | |
92 | return cdce925_pll_calculate_rate(parent_rate, n: data->n, m: data->m); |
93 | } |
94 | |
95 | static void cdce925_pll_find_rate(unsigned long rate, |
96 | unsigned long parent_rate, u16 *n, u16 *m) |
97 | { |
98 | unsigned long un; |
99 | unsigned long um; |
100 | unsigned long g; |
101 | |
102 | if (rate <= parent_rate) { |
103 | /* Can always deliver parent_rate in bypass mode */ |
104 | *n = 0; |
105 | *m = 0; |
106 | } else { |
107 | /* In PLL mode, need to apply min/max range */ |
108 | if (rate < CDCE925_PLL_FREQUENCY_MIN) |
109 | rate = CDCE925_PLL_FREQUENCY_MIN; |
110 | else if (rate > CDCE925_PLL_FREQUENCY_MAX) |
111 | rate = CDCE925_PLL_FREQUENCY_MAX; |
112 | |
113 | g = gcd(a: rate, b: parent_rate); |
114 | um = parent_rate / g; |
115 | un = rate / g; |
116 | /* When outside hw range, reduce to fit (rounding errors) */ |
117 | while ((un > 4095) || (um > 511)) { |
118 | un >>= 1; |
119 | um >>= 1; |
120 | } |
121 | if (un == 0) |
122 | un = 1; |
123 | if (um == 0) |
124 | um = 1; |
125 | |
126 | *n = un; |
127 | *m = um; |
128 | } |
129 | } |
130 | |
131 | static long cdce925_pll_round_rate(struct clk_hw *hw, unsigned long rate, |
132 | unsigned long *parent_rate) |
133 | { |
134 | u16 n, m; |
135 | |
136 | cdce925_pll_find_rate(rate, parent_rate: *parent_rate, n: &n, m: &m); |
137 | return (long)cdce925_pll_calculate_rate(parent_rate: *parent_rate, n, m); |
138 | } |
139 | |
140 | static int cdce925_pll_set_rate(struct clk_hw *hw, unsigned long rate, |
141 | unsigned long parent_rate) |
142 | { |
143 | struct clk_cdce925_pll *data = to_clk_cdce925_pll(hw); |
144 | |
145 | if (!rate || (rate == parent_rate)) { |
146 | data->m = 0; /* Bypass mode */ |
147 | data->n = 0; |
148 | return 0; |
149 | } |
150 | |
151 | if ((rate < CDCE925_PLL_FREQUENCY_MIN) || |
152 | (rate > CDCE925_PLL_FREQUENCY_MAX)) { |
153 | pr_debug("%s: rate %lu outside PLL range.\n" , __func__, rate); |
154 | return -EINVAL; |
155 | } |
156 | |
157 | if (rate < parent_rate) { |
158 | pr_debug("%s: rate %lu less than parent rate %lu.\n" , __func__, |
159 | rate, parent_rate); |
160 | return -EINVAL; |
161 | } |
162 | |
163 | cdce925_pll_find_rate(rate, parent_rate, n: &data->n, m: &data->m); |
164 | return 0; |
165 | } |
166 | |
167 | |
168 | /* calculate p = max(0, 4 - int(log2 (n/m))) */ |
169 | static u8 cdce925_pll_calc_p(u16 n, u16 m) |
170 | { |
171 | u8 p; |
172 | u16 r = n / m; |
173 | |
174 | if (r >= 16) |
175 | return 0; |
176 | p = 4; |
177 | while (r > 1) { |
178 | r >>= 1; |
179 | --p; |
180 | } |
181 | return p; |
182 | } |
183 | |
184 | /* Returns VCO range bits for VCO1_0_RANGE */ |
185 | static u8 cdce925_pll_calc_range_bits(struct clk_hw *hw, u16 n, u16 m) |
186 | { |
187 | struct clk *parent = clk_get_parent(clk: hw->clk); |
188 | unsigned long rate = clk_get_rate(clk: parent); |
189 | |
190 | rate = mult_frac(rate, (unsigned long)n, (unsigned long)m); |
191 | if (rate >= 175000000) |
192 | return 0x3; |
193 | if (rate >= 150000000) |
194 | return 0x02; |
195 | if (rate >= 125000000) |
196 | return 0x01; |
197 | return 0x00; |
198 | } |
199 | |
200 | /* I2C clock, hence everything must happen in (un)prepare because this |
201 | * may sleep */ |
202 | static int cdce925_pll_prepare(struct clk_hw *hw) |
203 | { |
204 | struct clk_cdce925_pll *data = to_clk_cdce925_pll(hw); |
205 | u16 n = data->n; |
206 | u16 m = data->m; |
207 | u16 r; |
208 | u8 q; |
209 | u8 p; |
210 | u16 nn; |
211 | u8 pll[4]; /* Bits are spread out over 4 byte registers */ |
212 | u8 reg_ofs = data->index * CDCE925_OFFSET_PLL; |
213 | unsigned i; |
214 | |
215 | if ((!m || !n) || (m == n)) { |
216 | /* Set PLL mux to bypass mode, leave the rest as is */ |
217 | regmap_update_bits(map: data->chip->regmap, |
218 | reg: reg_ofs + CDCE925_PLL_MUX_OUTPUTS, mask: 0x80, val: 0x80); |
219 | } else { |
220 | /* According to data sheet: */ |
221 | /* p = max(0, 4 - int(log2 (n/m))) */ |
222 | p = cdce925_pll_calc_p(n, m); |
223 | /* nn = n * 2^p */ |
224 | nn = n * BIT(p); |
225 | /* q = int(nn/m) */ |
226 | q = nn / m; |
227 | if ((q < 16) || (q > 63)) { |
228 | pr_debug("%s invalid q=%d\n" , __func__, q); |
229 | return -EINVAL; |
230 | } |
231 | r = nn - (m*q); |
232 | if (r > 511) { |
233 | pr_debug("%s invalid r=%d\n" , __func__, r); |
234 | return -EINVAL; |
235 | } |
236 | pr_debug("%s n=%d m=%d p=%d q=%d r=%d\n" , __func__, |
237 | n, m, p, q, r); |
238 | /* encode into register bits */ |
239 | pll[0] = n >> 4; |
240 | pll[1] = ((n & 0x0F) << 4) | ((r >> 5) & 0x0F); |
241 | pll[2] = ((r & 0x1F) << 3) | ((q >> 3) & 0x07); |
242 | pll[3] = ((q & 0x07) << 5) | (p << 2) | |
243 | cdce925_pll_calc_range_bits(hw, n, m); |
244 | /* Write to registers */ |
245 | for (i = 0; i < ARRAY_SIZE(pll); ++i) |
246 | regmap_write(map: data->chip->regmap, |
247 | reg: reg_ofs + CDCE925_PLL_MULDIV + i, val: pll[i]); |
248 | /* Enable PLL */ |
249 | regmap_update_bits(map: data->chip->regmap, |
250 | reg: reg_ofs + CDCE925_PLL_MUX_OUTPUTS, mask: 0x80, val: 0x00); |
251 | } |
252 | |
253 | return 0; |
254 | } |
255 | |
256 | static void cdce925_pll_unprepare(struct clk_hw *hw) |
257 | { |
258 | struct clk_cdce925_pll *data = to_clk_cdce925_pll(hw); |
259 | u8 reg_ofs = data->index * CDCE925_OFFSET_PLL; |
260 | |
261 | regmap_update_bits(map: data->chip->regmap, |
262 | reg: reg_ofs + CDCE925_PLL_MUX_OUTPUTS, mask: 0x80, val: 0x80); |
263 | } |
264 | |
265 | static const struct clk_ops cdce925_pll_ops = { |
266 | .prepare = cdce925_pll_prepare, |
267 | .unprepare = cdce925_pll_unprepare, |
268 | .recalc_rate = cdce925_pll_recalc_rate, |
269 | .round_rate = cdce925_pll_round_rate, |
270 | .set_rate = cdce925_pll_set_rate, |
271 | }; |
272 | |
273 | |
274 | static void cdce925_clk_set_pdiv(struct clk_cdce925_output *data, u16 pdiv) |
275 | { |
276 | switch (data->index) { |
277 | case 0: |
278 | regmap_update_bits(map: data->chip->regmap, |
279 | CDCE925_REG_Y1SPIPDIVH, |
280 | mask: 0x03, val: (pdiv >> 8) & 0x03); |
281 | regmap_write(map: data->chip->regmap, reg: 0x03, val: pdiv & 0xFF); |
282 | break; |
283 | case 1: |
284 | regmap_update_bits(map: data->chip->regmap, reg: 0x16, mask: 0x7F, val: pdiv); |
285 | break; |
286 | case 2: |
287 | regmap_update_bits(map: data->chip->regmap, reg: 0x17, mask: 0x7F, val: pdiv); |
288 | break; |
289 | case 3: |
290 | regmap_update_bits(map: data->chip->regmap, reg: 0x26, mask: 0x7F, val: pdiv); |
291 | break; |
292 | case 4: |
293 | regmap_update_bits(map: data->chip->regmap, reg: 0x27, mask: 0x7F, val: pdiv); |
294 | break; |
295 | case 5: |
296 | regmap_update_bits(map: data->chip->regmap, reg: 0x36, mask: 0x7F, val: pdiv); |
297 | break; |
298 | case 6: |
299 | regmap_update_bits(map: data->chip->regmap, reg: 0x37, mask: 0x7F, val: pdiv); |
300 | break; |
301 | case 7: |
302 | regmap_update_bits(map: data->chip->regmap, reg: 0x46, mask: 0x7F, val: pdiv); |
303 | break; |
304 | case 8: |
305 | regmap_update_bits(map: data->chip->regmap, reg: 0x47, mask: 0x7F, val: pdiv); |
306 | break; |
307 | } |
308 | } |
309 | |
310 | static void cdce925_clk_activate(struct clk_cdce925_output *data) |
311 | { |
312 | switch (data->index) { |
313 | case 0: |
314 | regmap_update_bits(map: data->chip->regmap, |
315 | CDCE925_REG_Y1SPIPDIVH, mask: 0x0c, val: 0x0c); |
316 | break; |
317 | case 1: |
318 | case 2: |
319 | regmap_update_bits(map: data->chip->regmap, reg: 0x14, mask: 0x03, val: 0x03); |
320 | break; |
321 | case 3: |
322 | case 4: |
323 | regmap_update_bits(map: data->chip->regmap, reg: 0x24, mask: 0x03, val: 0x03); |
324 | break; |
325 | case 5: |
326 | case 6: |
327 | regmap_update_bits(map: data->chip->regmap, reg: 0x34, mask: 0x03, val: 0x03); |
328 | break; |
329 | case 7: |
330 | case 8: |
331 | regmap_update_bits(map: data->chip->regmap, reg: 0x44, mask: 0x03, val: 0x03); |
332 | break; |
333 | } |
334 | } |
335 | |
336 | static int cdce925_clk_prepare(struct clk_hw *hw) |
337 | { |
338 | struct clk_cdce925_output *data = to_clk_cdce925_output(hw); |
339 | |
340 | cdce925_clk_set_pdiv(data, pdiv: data->pdiv); |
341 | cdce925_clk_activate(data); |
342 | return 0; |
343 | } |
344 | |
345 | static void cdce925_clk_unprepare(struct clk_hw *hw) |
346 | { |
347 | struct clk_cdce925_output *data = to_clk_cdce925_output(hw); |
348 | |
349 | /* Disable clock by setting divider to "0" */ |
350 | cdce925_clk_set_pdiv(data, pdiv: 0); |
351 | } |
352 | |
353 | static unsigned long cdce925_clk_recalc_rate(struct clk_hw *hw, |
354 | unsigned long parent_rate) |
355 | { |
356 | struct clk_cdce925_output *data = to_clk_cdce925_output(hw); |
357 | |
358 | if (data->pdiv) |
359 | return parent_rate / data->pdiv; |
360 | return 0; |
361 | } |
362 | |
363 | static u16 cdce925_calc_divider(unsigned long rate, |
364 | unsigned long parent_rate) |
365 | { |
366 | unsigned long divider; |
367 | |
368 | if (!rate) |
369 | return 0; |
370 | if (rate >= parent_rate) |
371 | return 1; |
372 | |
373 | divider = DIV_ROUND_CLOSEST(parent_rate, rate); |
374 | if (divider > 0x7F) |
375 | divider = 0x7F; |
376 | |
377 | return (u16)divider; |
378 | } |
379 | |
380 | static unsigned long cdce925_clk_best_parent_rate( |
381 | struct clk_hw *hw, unsigned long rate) |
382 | { |
383 | struct clk *pll = clk_get_parent(clk: hw->clk); |
384 | struct clk *root = clk_get_parent(clk: pll); |
385 | unsigned long root_rate = clk_get_rate(clk: root); |
386 | unsigned long best_rate_error = rate; |
387 | u16 pdiv_min; |
388 | u16 pdiv_max; |
389 | u16 pdiv_best; |
390 | u16 pdiv_now; |
391 | |
392 | if (root_rate % rate == 0) |
393 | return root_rate; /* Don't need the PLL, use bypass */ |
394 | |
395 | pdiv_min = (u16)max(1ul, DIV_ROUND_UP(CDCE925_PLL_FREQUENCY_MIN, rate)); |
396 | pdiv_max = (u16)min(127ul, CDCE925_PLL_FREQUENCY_MAX / rate); |
397 | |
398 | if (pdiv_min > pdiv_max) |
399 | return 0; /* No can do? */ |
400 | |
401 | pdiv_best = pdiv_min; |
402 | for (pdiv_now = pdiv_min; pdiv_now < pdiv_max; ++pdiv_now) { |
403 | unsigned long target_rate = rate * pdiv_now; |
404 | long pll_rate = clk_round_rate(clk: pll, rate: target_rate); |
405 | unsigned long actual_rate; |
406 | unsigned long rate_error; |
407 | |
408 | if (pll_rate <= 0) |
409 | continue; |
410 | actual_rate = pll_rate / pdiv_now; |
411 | rate_error = abs((long)actual_rate - (long)rate); |
412 | if (rate_error < best_rate_error) { |
413 | pdiv_best = pdiv_now; |
414 | best_rate_error = rate_error; |
415 | } |
416 | /* TODO: Consider PLL frequency based on smaller n/m values |
417 | * and pick the better one if the error is equal */ |
418 | } |
419 | |
420 | return rate * pdiv_best; |
421 | } |
422 | |
423 | static long cdce925_clk_round_rate(struct clk_hw *hw, unsigned long rate, |
424 | unsigned long *parent_rate) |
425 | { |
426 | unsigned long l_parent_rate = *parent_rate; |
427 | u16 divider = cdce925_calc_divider(rate, parent_rate: l_parent_rate); |
428 | |
429 | if (l_parent_rate / divider != rate) { |
430 | l_parent_rate = cdce925_clk_best_parent_rate(hw, rate); |
431 | divider = cdce925_calc_divider(rate, parent_rate: l_parent_rate); |
432 | *parent_rate = l_parent_rate; |
433 | } |
434 | |
435 | if (divider) |
436 | return (long)(l_parent_rate / divider); |
437 | return 0; |
438 | } |
439 | |
440 | static int cdce925_clk_set_rate(struct clk_hw *hw, unsigned long rate, |
441 | unsigned long parent_rate) |
442 | { |
443 | struct clk_cdce925_output *data = to_clk_cdce925_output(hw); |
444 | |
445 | data->pdiv = cdce925_calc_divider(rate, parent_rate); |
446 | |
447 | return 0; |
448 | } |
449 | |
450 | static const struct clk_ops cdce925_clk_ops = { |
451 | .prepare = cdce925_clk_prepare, |
452 | .unprepare = cdce925_clk_unprepare, |
453 | .recalc_rate = cdce925_clk_recalc_rate, |
454 | .round_rate = cdce925_clk_round_rate, |
455 | .set_rate = cdce925_clk_set_rate, |
456 | }; |
457 | |
458 | |
459 | static u16 cdce925_y1_calc_divider(unsigned long rate, |
460 | unsigned long parent_rate) |
461 | { |
462 | unsigned long divider; |
463 | |
464 | if (!rate) |
465 | return 0; |
466 | if (rate >= parent_rate) |
467 | return 1; |
468 | |
469 | divider = DIV_ROUND_CLOSEST(parent_rate, rate); |
470 | if (divider > 0x3FF) /* Y1 has 10-bit divider */ |
471 | divider = 0x3FF; |
472 | |
473 | return (u16)divider; |
474 | } |
475 | |
476 | static long cdce925_clk_y1_round_rate(struct clk_hw *hw, unsigned long rate, |
477 | unsigned long *parent_rate) |
478 | { |
479 | unsigned long l_parent_rate = *parent_rate; |
480 | u16 divider = cdce925_y1_calc_divider(rate, parent_rate: l_parent_rate); |
481 | |
482 | if (divider) |
483 | return (long)(l_parent_rate / divider); |
484 | return 0; |
485 | } |
486 | |
487 | static int cdce925_clk_y1_set_rate(struct clk_hw *hw, unsigned long rate, |
488 | unsigned long parent_rate) |
489 | { |
490 | struct clk_cdce925_output *data = to_clk_cdce925_output(hw); |
491 | |
492 | data->pdiv = cdce925_y1_calc_divider(rate, parent_rate); |
493 | |
494 | return 0; |
495 | } |
496 | |
497 | static const struct clk_ops cdce925_clk_y1_ops = { |
498 | .prepare = cdce925_clk_prepare, |
499 | .unprepare = cdce925_clk_unprepare, |
500 | .recalc_rate = cdce925_clk_recalc_rate, |
501 | .round_rate = cdce925_clk_y1_round_rate, |
502 | .set_rate = cdce925_clk_y1_set_rate, |
503 | }; |
504 | |
505 | #define CDCE925_I2C_COMMAND_BLOCK_TRANSFER 0x00 |
506 | #define CDCE925_I2C_COMMAND_BYTE_TRANSFER 0x80 |
507 | |
508 | static int cdce925_regmap_i2c_write( |
509 | void *context, const void *data, size_t count) |
510 | { |
511 | struct device *dev = context; |
512 | struct i2c_client *i2c = to_i2c_client(dev); |
513 | int ret; |
514 | u8 reg_data[2]; |
515 | |
516 | if (count != 2) |
517 | return -ENOTSUPP; |
518 | |
519 | /* First byte is command code */ |
520 | reg_data[0] = CDCE925_I2C_COMMAND_BYTE_TRANSFER | ((u8 *)data)[0]; |
521 | reg_data[1] = ((u8 *)data)[1]; |
522 | |
523 | dev_dbg(&i2c->dev, "%s(%zu) %#x %#x\n" , __func__, count, |
524 | reg_data[0], reg_data[1]); |
525 | |
526 | ret = i2c_master_send(client: i2c, buf: reg_data, count); |
527 | if (likely(ret == count)) |
528 | return 0; |
529 | else if (ret < 0) |
530 | return ret; |
531 | else |
532 | return -EIO; |
533 | } |
534 | |
535 | static int cdce925_regmap_i2c_read(void *context, |
536 | const void *reg, size_t reg_size, void *val, size_t val_size) |
537 | { |
538 | struct device *dev = context; |
539 | struct i2c_client *i2c = to_i2c_client(dev); |
540 | struct i2c_msg xfer[2]; |
541 | int ret; |
542 | u8 reg_data[2]; |
543 | |
544 | if (reg_size != 1) |
545 | return -ENOTSUPP; |
546 | |
547 | xfer[0].addr = i2c->addr; |
548 | xfer[0].flags = 0; |
549 | xfer[0].buf = reg_data; |
550 | if (val_size == 1) { |
551 | reg_data[0] = |
552 | CDCE925_I2C_COMMAND_BYTE_TRANSFER | ((u8 *)reg)[0]; |
553 | xfer[0].len = 1; |
554 | } else { |
555 | reg_data[0] = |
556 | CDCE925_I2C_COMMAND_BLOCK_TRANSFER | ((u8 *)reg)[0]; |
557 | reg_data[1] = val_size; |
558 | xfer[0].len = 2; |
559 | } |
560 | |
561 | xfer[1].addr = i2c->addr; |
562 | xfer[1].flags = I2C_M_RD; |
563 | xfer[1].len = val_size; |
564 | xfer[1].buf = val; |
565 | |
566 | ret = i2c_transfer(adap: i2c->adapter, msgs: xfer, num: 2); |
567 | if (likely(ret == 2)) { |
568 | dev_dbg(&i2c->dev, "%s(%zu, %zu) %#x %#x\n" , __func__, |
569 | reg_size, val_size, reg_data[0], *((u8 *)val)); |
570 | return 0; |
571 | } else if (ret < 0) |
572 | return ret; |
573 | else |
574 | return -EIO; |
575 | } |
576 | |
577 | static struct clk_hw * |
578 | of_clk_cdce925_get(struct of_phandle_args *clkspec, void *_data) |
579 | { |
580 | struct clk_cdce925_chip *data = _data; |
581 | unsigned int idx = clkspec->args[0]; |
582 | |
583 | if (idx >= ARRAY_SIZE(data->clk)) { |
584 | pr_err("%s: invalid index %u\n" , __func__, idx); |
585 | return ERR_PTR(error: -EINVAL); |
586 | } |
587 | |
588 | return &data->clk[idx].hw; |
589 | } |
590 | |
591 | static int cdce925_regulator_enable(struct device *dev, const char *name) |
592 | { |
593 | int err; |
594 | |
595 | err = devm_regulator_get_enable(dev, id: name); |
596 | if (err) |
597 | dev_err_probe(dev, err, fmt: "Failed to enable %s:\n" , name); |
598 | |
599 | return err; |
600 | } |
601 | |
602 | /* The CDCE925 uses a funky way to read/write registers. Bulk mode is |
603 | * just weird, so just use the single byte mode exclusively. */ |
604 | static struct regmap_bus regmap_cdce925_bus = { |
605 | .write = cdce925_regmap_i2c_write, |
606 | .read = cdce925_regmap_i2c_read, |
607 | }; |
608 | |
609 | static int cdce925_probe(struct i2c_client *client) |
610 | { |
611 | struct clk_cdce925_chip *data; |
612 | struct device_node *node = client->dev.of_node; |
613 | const char *parent_name; |
614 | const char *pll_clk_name[MAX_NUMBER_OF_PLLS] = {NULL,}; |
615 | struct clk_init_data init; |
616 | u32 value; |
617 | int i; |
618 | int err; |
619 | struct device_node *np_output; |
620 | char child_name[6]; |
621 | struct regmap_config config = { |
622 | .name = "configuration0" , |
623 | .reg_bits = 8, |
624 | .val_bits = 8, |
625 | .cache_type = REGCACHE_MAPLE, |
626 | }; |
627 | |
628 | dev_dbg(&client->dev, "%s\n" , __func__); |
629 | |
630 | err = cdce925_regulator_enable(dev: &client->dev, name: "vdd" ); |
631 | if (err) |
632 | return err; |
633 | |
634 | err = cdce925_regulator_enable(dev: &client->dev, name: "vddout" ); |
635 | if (err) |
636 | return err; |
637 | |
638 | data = devm_kzalloc(dev: &client->dev, size: sizeof(*data), GFP_KERNEL); |
639 | if (!data) |
640 | return -ENOMEM; |
641 | |
642 | data->i2c_client = client; |
643 | data->chip_info = i2c_get_match_data(client); |
644 | config.max_register = CDCE925_OFFSET_PLL + |
645 | data->chip_info->num_plls * 0x10 - 1; |
646 | data->regmap = devm_regmap_init(&client->dev, ®map_cdce925_bus, |
647 | &client->dev, &config); |
648 | if (IS_ERR(ptr: data->regmap)) { |
649 | dev_err(&client->dev, "failed to allocate register map\n" ); |
650 | return PTR_ERR(ptr: data->regmap); |
651 | } |
652 | i2c_set_clientdata(client, data); |
653 | |
654 | parent_name = of_clk_get_parent_name(np: node, index: 0); |
655 | if (!parent_name) { |
656 | dev_err(&client->dev, "missing parent clock\n" ); |
657 | return -ENODEV; |
658 | } |
659 | dev_dbg(&client->dev, "parent is: %s\n" , parent_name); |
660 | |
661 | if (of_property_read_u32(np: node, propname: "xtal-load-pf" , out_value: &value) == 0) |
662 | regmap_write(map: data->regmap, |
663 | CDCE925_REG_XCSEL, val: (value << 3) & 0xF8); |
664 | /* PWDN bit */ |
665 | regmap_update_bits(map: data->regmap, CDCE925_REG_GLOBAL1, BIT(4), val: 0); |
666 | |
667 | /* Set input source for Y1 to be the XTAL */ |
668 | regmap_update_bits(map: data->regmap, reg: 0x02, BIT(7), val: 0); |
669 | |
670 | init.ops = &cdce925_pll_ops; |
671 | init.flags = 0; |
672 | init.parent_names = &parent_name; |
673 | init.num_parents = 1; |
674 | |
675 | /* Register PLL clocks */ |
676 | for (i = 0; i < data->chip_info->num_plls; ++i) { |
677 | pll_clk_name[i] = kasprintf(GFP_KERNEL, fmt: "%pOFn.pll%d" , |
678 | client->dev.of_node, i); |
679 | if (!pll_clk_name[i]) { |
680 | err = -ENOMEM; |
681 | goto error; |
682 | } |
683 | init.name = pll_clk_name[i]; |
684 | data->pll[i].chip = data; |
685 | data->pll[i].hw.init = &init; |
686 | data->pll[i].index = i; |
687 | err = devm_clk_hw_register(dev: &client->dev, hw: &data->pll[i].hw); |
688 | if (err) { |
689 | dev_err(&client->dev, "Failed register PLL %d\n" , i); |
690 | goto error; |
691 | } |
692 | sprintf(buf: child_name, fmt: "PLL%d" , i+1); |
693 | np_output = of_get_child_by_name(node, name: child_name); |
694 | if (!np_output) |
695 | continue; |
696 | if (!of_property_read_u32(np: np_output, |
697 | propname: "clock-frequency" , out_value: &value)) { |
698 | err = clk_set_rate(clk: data->pll[i].hw.clk, rate: value); |
699 | if (err) |
700 | dev_err(&client->dev, |
701 | "unable to set PLL frequency %ud\n" , |
702 | value); |
703 | } |
704 | if (!of_property_read_u32(np: np_output, |
705 | propname: "spread-spectrum" , out_value: &value)) { |
706 | u8 flag = of_property_read_bool(np: np_output, |
707 | propname: "spread-spectrum-center" ) ? 0x80 : 0x00; |
708 | regmap_update_bits(map: data->regmap, |
709 | reg: 0x16 + (i*CDCE925_OFFSET_PLL), |
710 | mask: 0x80, val: flag); |
711 | regmap_update_bits(map: data->regmap, |
712 | reg: 0x12 + (i*CDCE925_OFFSET_PLL), |
713 | mask: 0x07, val: value & 0x07); |
714 | } |
715 | of_node_put(node: np_output); |
716 | } |
717 | |
718 | /* Register output clock Y1 */ |
719 | init.ops = &cdce925_clk_y1_ops; |
720 | init.flags = 0; |
721 | init.num_parents = 1; |
722 | init.parent_names = &parent_name; /* Mux Y1 to input */ |
723 | init.name = kasprintf(GFP_KERNEL, fmt: "%pOFn.Y1" , client->dev.of_node); |
724 | if (!init.name) { |
725 | err = -ENOMEM; |
726 | goto error; |
727 | } |
728 | data->clk[0].chip = data; |
729 | data->clk[0].hw.init = &init; |
730 | data->clk[0].index = 0; |
731 | data->clk[0].pdiv = 1; |
732 | err = devm_clk_hw_register(dev: &client->dev, hw: &data->clk[0].hw); |
733 | kfree(objp: init.name); /* clock framework made a copy of the name */ |
734 | if (err) { |
735 | dev_err(&client->dev, "clock registration Y1 failed\n" ); |
736 | goto error; |
737 | } |
738 | |
739 | /* Register output clocks Y2 .. Y5*/ |
740 | init.ops = &cdce925_clk_ops; |
741 | init.flags = CLK_SET_RATE_PARENT; |
742 | init.num_parents = 1; |
743 | for (i = 1; i < data->chip_info->num_outputs; ++i) { |
744 | init.name = kasprintf(GFP_KERNEL, fmt: "%pOFn.Y%d" , |
745 | client->dev.of_node, i+1); |
746 | if (!init.name) { |
747 | err = -ENOMEM; |
748 | goto error; |
749 | } |
750 | data->clk[i].chip = data; |
751 | data->clk[i].hw.init = &init; |
752 | data->clk[i].index = i; |
753 | data->clk[i].pdiv = 1; |
754 | switch (i) { |
755 | case 1: |
756 | case 2: |
757 | /* Mux Y2/3 to PLL1 */ |
758 | init.parent_names = &pll_clk_name[0]; |
759 | break; |
760 | case 3: |
761 | case 4: |
762 | /* Mux Y4/5 to PLL2 */ |
763 | init.parent_names = &pll_clk_name[1]; |
764 | break; |
765 | case 5: |
766 | case 6: |
767 | /* Mux Y6/7 to PLL3 */ |
768 | init.parent_names = &pll_clk_name[2]; |
769 | break; |
770 | case 7: |
771 | case 8: |
772 | /* Mux Y8/9 to PLL4 */ |
773 | init.parent_names = &pll_clk_name[3]; |
774 | break; |
775 | } |
776 | err = devm_clk_hw_register(dev: &client->dev, hw: &data->clk[i].hw); |
777 | kfree(objp: init.name); /* clock framework made a copy of the name */ |
778 | if (err) { |
779 | dev_err(&client->dev, "clock registration failed\n" ); |
780 | goto error; |
781 | } |
782 | } |
783 | |
784 | /* Register the output clocks */ |
785 | err = of_clk_add_hw_provider(np: client->dev.of_node, get: of_clk_cdce925_get, |
786 | data); |
787 | if (err) |
788 | dev_err(&client->dev, "unable to add OF clock provider\n" ); |
789 | |
790 | err = 0; |
791 | |
792 | error: |
793 | for (i = 0; i < data->chip_info->num_plls; ++i) |
794 | /* clock framework made a copy of the name */ |
795 | kfree(objp: pll_clk_name[i]); |
796 | |
797 | return err; |
798 | } |
799 | |
800 | static const struct clk_cdce925_chip_info clk_cdce913_info = { |
801 | .num_plls = 1, |
802 | .num_outputs = 3, |
803 | }; |
804 | |
805 | static const struct clk_cdce925_chip_info clk_cdce925_info = { |
806 | .num_plls = 2, |
807 | .num_outputs = 5, |
808 | }; |
809 | |
810 | static const struct clk_cdce925_chip_info clk_cdce937_info = { |
811 | .num_plls = 3, |
812 | .num_outputs = 7, |
813 | }; |
814 | |
815 | static const struct clk_cdce925_chip_info clk_cdce949_info = { |
816 | .num_plls = 4, |
817 | .num_outputs = 9, |
818 | }; |
819 | |
820 | static const struct i2c_device_id cdce925_id[] = { |
821 | { "cdce913" , (kernel_ulong_t)&clk_cdce913_info }, |
822 | { "cdce925" , (kernel_ulong_t)&clk_cdce925_info }, |
823 | { "cdce937" , (kernel_ulong_t)&clk_cdce937_info }, |
824 | { "cdce949" , (kernel_ulong_t)&clk_cdce949_info }, |
825 | { } |
826 | }; |
827 | MODULE_DEVICE_TABLE(i2c, cdce925_id); |
828 | |
829 | static const struct of_device_id clk_cdce925_of_match[] = { |
830 | { .compatible = "ti,cdce913" , .data = &clk_cdce913_info }, |
831 | { .compatible = "ti,cdce925" , .data = &clk_cdce925_info }, |
832 | { .compatible = "ti,cdce937" , .data = &clk_cdce937_info }, |
833 | { .compatible = "ti,cdce949" , .data = &clk_cdce949_info }, |
834 | { } |
835 | }; |
836 | MODULE_DEVICE_TABLE(of, clk_cdce925_of_match); |
837 | |
838 | static struct i2c_driver cdce925_driver = { |
839 | .driver = { |
840 | .name = "cdce925" , |
841 | .of_match_table = clk_cdce925_of_match, |
842 | }, |
843 | .probe = cdce925_probe, |
844 | .id_table = cdce925_id, |
845 | }; |
846 | module_i2c_driver(cdce925_driver); |
847 | |
848 | MODULE_AUTHOR("Mike Looijmans <mike.looijmans@topic.nl>" ); |
849 | MODULE_DESCRIPTION("TI CDCE913/925/937/949 driver" ); |
850 | MODULE_LICENSE("GPL" ); |
851 | |