1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright 2017,2018 NXP
4 * Copyright 2019 Purism SPC
5 */
6
7 #include <linux/bitfield.h>
8 #include <linux/clk.h>
9 #include <linux/clk-provider.h>
10 #include <linux/delay.h>
11 #include <linux/firmware/imx/ipc.h>
12 #include <linux/firmware/imx/svc/misc.h>
13 #include <linux/io.h>
14 #include <linux/kernel.h>
15 #include <linux/mfd/syscon.h>
16 #include <linux/module.h>
17 #include <linux/of.h>
18 #include <linux/of_platform.h>
19 #include <linux/phy/phy.h>
20 #include <linux/platform_device.h>
21 #include <linux/regmap.h>
22 #include <dt-bindings/firmware/imx/rsrc.h>
23
24 /* Control and Status Registers(CSR) */
25 #define PHY_CTRL 0x00
26 #define CCM_MASK GENMASK(7, 5)
27 #define CCM(n) FIELD_PREP(CCM_MASK, (n))
28 #define CCM_1_2V 0x5
29 #define CA_MASK GENMASK(4, 2)
30 #define CA_3_51MA 0x4
31 #define CA(n) FIELD_PREP(CA_MASK, (n))
32 #define RFB BIT(1)
33 #define LVDS_EN BIT(0)
34
35 /* DPHY registers */
36 #define DPHY_PD_DPHY 0x00
37 #define DPHY_M_PRG_HS_PREPARE 0x04
38 #define DPHY_MC_PRG_HS_PREPARE 0x08
39 #define DPHY_M_PRG_HS_ZERO 0x0c
40 #define DPHY_MC_PRG_HS_ZERO 0x10
41 #define DPHY_M_PRG_HS_TRAIL 0x14
42 #define DPHY_MC_PRG_HS_TRAIL 0x18
43 #define DPHY_PD_PLL 0x1c
44 #define DPHY_TST 0x20
45 #define DPHY_CN 0x24
46 #define DPHY_CM 0x28
47 #define DPHY_CO 0x2c
48 #define DPHY_LOCK 0x30
49 #define DPHY_LOCK_BYP 0x34
50 #define DPHY_REG_BYPASS_PLL 0x4C
51
52 #define MBPS(x) ((x) * 1000000)
53
54 #define DATA_RATE_MAX_SPEED MBPS(1500)
55 #define DATA_RATE_MIN_SPEED MBPS(80)
56
57 #define PLL_LOCK_SLEEP 10
58 #define PLL_LOCK_TIMEOUT 1000
59
60 #define CN_BUF 0xcb7a89c0
61 #define CO_BUF 0x63
62 #define CM(x) ( \
63 ((x) < 32) ? 0xe0 | ((x) - 16) : \
64 ((x) < 64) ? 0xc0 | ((x) - 32) : \
65 ((x) < 128) ? 0x80 | ((x) - 64) : \
66 ((x) - 128))
67 #define CN(x) (((x) == 1) ? 0x1f : (((CN_BUF) >> ((x) - 1)) & 0x1f))
68 #define CO(x) ((CO_BUF) >> (8 - (x)) & 0x03)
69
70 /* PHY power on is active low */
71 #define PWR_ON 0
72 #define PWR_OFF 1
73
74 #define MIN_VCO_FREQ 640000000
75 #define MAX_VCO_FREQ 1500000000
76
77 #define MIN_LVDS_REFCLK_FREQ 24000000
78 #define MAX_LVDS_REFCLK_FREQ 150000000
79
80 enum mixel_dphy_devtype {
81 MIXEL_IMX8MQ,
82 MIXEL_IMX8QXP,
83 };
84
85 struct mixel_dphy_devdata {
86 u8 reg_tx_rcal;
87 u8 reg_auto_pd_en;
88 u8 reg_rxlprp;
89 u8 reg_rxcdrp;
90 u8 reg_rxhs_settle;
91 bool is_combo; /* MIPI DPHY and LVDS PHY combo */
92 };
93
94 static const struct mixel_dphy_devdata mixel_dphy_devdata[] = {
95 [MIXEL_IMX8MQ] = {
96 .reg_tx_rcal = 0x38,
97 .reg_auto_pd_en = 0x3c,
98 .reg_rxlprp = 0x40,
99 .reg_rxcdrp = 0x44,
100 .reg_rxhs_settle = 0x48,
101 .is_combo = false,
102 },
103 [MIXEL_IMX8QXP] = {
104 .is_combo = true,
105 },
106 };
107
108 struct mixel_dphy_cfg {
109 /* DPHY PLL parameters */
110 u32 cm;
111 u32 cn;
112 u32 co;
113 /* DPHY register values */
114 u8 mc_prg_hs_prepare;
115 u8 m_prg_hs_prepare;
116 u8 mc_prg_hs_zero;
117 u8 m_prg_hs_zero;
118 u8 mc_prg_hs_trail;
119 u8 m_prg_hs_trail;
120 u8 rxhs_settle;
121 };
122
123 struct mixel_dphy_priv {
124 struct mixel_dphy_cfg cfg;
125 struct regmap *regmap;
126 struct regmap *lvds_regmap;
127 struct clk *phy_ref_clk;
128 const struct mixel_dphy_devdata *devdata;
129 struct imx_sc_ipc *ipc_handle;
130 bool is_slave;
131 int id;
132 };
133
134 static const struct regmap_config mixel_dphy_regmap_config = {
135 .reg_bits = 8,
136 .val_bits = 32,
137 .reg_stride = 4,
138 .max_register = DPHY_REG_BYPASS_PLL,
139 .name = "mipi-dphy",
140 };
141
phy_write(struct phy * phy,u32 value,unsigned int reg)142 static int phy_write(struct phy *phy, u32 value, unsigned int reg)
143 {
144 struct mixel_dphy_priv *priv = phy_get_drvdata(phy);
145 int ret;
146
147 ret = regmap_write(priv->regmap, reg, value);
148 if (ret < 0)
149 dev_err(&phy->dev, "Failed to write DPHY reg %d: %d\n", reg,
150 ret);
151 return ret;
152 }
153
154 /*
155 * Find a ratio close to the desired one using continued fraction
156 * approximation ending either at exact match or maximum allowed
157 * nominator, denominator.
158 */
get_best_ratio(u32 * pnum,u32 * pdenom,u32 max_n,u32 max_d)159 static void get_best_ratio(u32 *pnum, u32 *pdenom, u32 max_n, u32 max_d)
160 {
161 u32 a = *pnum;
162 u32 b = *pdenom;
163 u32 c;
164 u32 n[] = {0, 1};
165 u32 d[] = {1, 0};
166 u32 whole;
167 unsigned int i = 1;
168
169 while (b) {
170 i ^= 1;
171 whole = a / b;
172 n[i] += (n[i ^ 1] * whole);
173 d[i] += (d[i ^ 1] * whole);
174 if ((n[i] > max_n) || (d[i] > max_d)) {
175 i ^= 1;
176 break;
177 }
178 c = a - (b * whole);
179 a = b;
180 b = c;
181 }
182 *pnum = n[i];
183 *pdenom = d[i];
184 }
185
mixel_dphy_config_from_opts(struct phy * phy,struct phy_configure_opts_mipi_dphy * dphy_opts,struct mixel_dphy_cfg * cfg)186 static int mixel_dphy_config_from_opts(struct phy *phy,
187 struct phy_configure_opts_mipi_dphy *dphy_opts,
188 struct mixel_dphy_cfg *cfg)
189 {
190 struct mixel_dphy_priv *priv = dev_get_drvdata(phy->dev.parent);
191 unsigned long ref_clk = clk_get_rate(priv->phy_ref_clk);
192 u32 lp_t, numerator, denominator;
193 unsigned long long tmp;
194 u32 n;
195 int i;
196
197 if (dphy_opts->hs_clk_rate > DATA_RATE_MAX_SPEED ||
198 dphy_opts->hs_clk_rate < DATA_RATE_MIN_SPEED)
199 return -EINVAL;
200
201 numerator = dphy_opts->hs_clk_rate;
202 denominator = ref_clk;
203 get_best_ratio(&numerator, &denominator, 255, 256);
204 if (!numerator || !denominator) {
205 dev_err(&phy->dev, "Invalid %d/%d for %ld/%ld\n",
206 numerator, denominator,
207 dphy_opts->hs_clk_rate, ref_clk);
208 return -EINVAL;
209 }
210
211 while ((numerator < 16) && (denominator <= 128)) {
212 numerator <<= 1;
213 denominator <<= 1;
214 }
215 /*
216 * CM ranges between 16 and 255
217 * CN ranges between 1 and 32
218 * CO is power of 2: 1, 2, 4, 8
219 */
220 i = __ffs(denominator);
221 if (i > 3)
222 i = 3;
223 cfg->cn = denominator >> i;
224 cfg->co = 1 << i;
225 cfg->cm = numerator;
226
227 if (cfg->cm < 16 || cfg->cm > 255 ||
228 cfg->cn < 1 || cfg->cn > 32 ||
229 cfg->co < 1 || cfg->co > 8) {
230 dev_err(&phy->dev, "Invalid CM/CN/CO values: %u/%u/%u\n",
231 cfg->cm, cfg->cn, cfg->co);
232 dev_err(&phy->dev, "for hs_clk/ref_clk=%ld/%ld ~ %d/%d\n",
233 dphy_opts->hs_clk_rate, ref_clk,
234 numerator, denominator);
235 return -EINVAL;
236 }
237
238 dev_dbg(&phy->dev, "hs_clk/ref_clk=%ld/%ld ~ %d/%d\n",
239 dphy_opts->hs_clk_rate, ref_clk, numerator, denominator);
240
241 /* LP clock period */
242 tmp = 1000000000000LL;
243 do_div(tmp, dphy_opts->lp_clk_rate); /* ps */
244 if (tmp > ULONG_MAX)
245 return -EINVAL;
246
247 lp_t = tmp;
248 dev_dbg(&phy->dev, "LP clock %lu, period: %u ps\n",
249 dphy_opts->lp_clk_rate, lp_t);
250
251 /* hs_prepare: in lp clock periods */
252 if (2 * dphy_opts->hs_prepare > 5 * lp_t) {
253 dev_err(&phy->dev,
254 "hs_prepare (%u) > 2.5 * lp clock period (%u)\n",
255 dphy_opts->hs_prepare, lp_t);
256 return -EINVAL;
257 }
258 /* 00: lp_t, 01: 1.5 * lp_t, 10: 2 * lp_t, 11: 2.5 * lp_t */
259 if (dphy_opts->hs_prepare < lp_t) {
260 n = 0;
261 } else {
262 tmp = 2 * (dphy_opts->hs_prepare - lp_t);
263 do_div(tmp, lp_t);
264 n = tmp;
265 }
266 cfg->m_prg_hs_prepare = n;
267
268 /* clk_prepare: in lp clock periods */
269 if (2 * dphy_opts->clk_prepare > 3 * lp_t) {
270 dev_err(&phy->dev,
271 "clk_prepare (%u) > 1.5 * lp clock period (%u)\n",
272 dphy_opts->clk_prepare, lp_t);
273 return -EINVAL;
274 }
275 /* 00: lp_t, 01: 1.5 * lp_t */
276 cfg->mc_prg_hs_prepare = dphy_opts->clk_prepare > lp_t ? 1 : 0;
277
278 /* hs_zero: formula from NXP BSP */
279 n = (144 * (dphy_opts->hs_clk_rate / 1000000) - 47500) / 10000;
280 cfg->m_prg_hs_zero = n < 1 ? 1 : n;
281
282 /* clk_zero: formula from NXP BSP */
283 n = (34 * (dphy_opts->hs_clk_rate / 1000000) - 2500) / 1000;
284 cfg->mc_prg_hs_zero = n < 1 ? 1 : n;
285
286 /* clk_trail, hs_trail: formula from NXP BSP */
287 n = (103 * (dphy_opts->hs_clk_rate / 1000000) + 10000) / 10000;
288 if (n > 15)
289 n = 15;
290 if (n < 1)
291 n = 1;
292 cfg->m_prg_hs_trail = n;
293 cfg->mc_prg_hs_trail = n;
294
295 /* rxhs_settle: formula from NXP BSP */
296 if (dphy_opts->hs_clk_rate < MBPS(80))
297 cfg->rxhs_settle = 0x0d;
298 else if (dphy_opts->hs_clk_rate < MBPS(90))
299 cfg->rxhs_settle = 0x0c;
300 else if (dphy_opts->hs_clk_rate < MBPS(125))
301 cfg->rxhs_settle = 0x0b;
302 else if (dphy_opts->hs_clk_rate < MBPS(150))
303 cfg->rxhs_settle = 0x0a;
304 else if (dphy_opts->hs_clk_rate < MBPS(225))
305 cfg->rxhs_settle = 0x09;
306 else if (dphy_opts->hs_clk_rate < MBPS(500))
307 cfg->rxhs_settle = 0x08;
308 else
309 cfg->rxhs_settle = 0x07;
310
311 dev_dbg(&phy->dev, "phy_config: %u %u %u %u %u %u %u\n",
312 cfg->m_prg_hs_prepare, cfg->mc_prg_hs_prepare,
313 cfg->m_prg_hs_zero, cfg->mc_prg_hs_zero,
314 cfg->m_prg_hs_trail, cfg->mc_prg_hs_trail,
315 cfg->rxhs_settle);
316
317 return 0;
318 }
319
mixel_phy_set_hs_timings(struct phy * phy)320 static void mixel_phy_set_hs_timings(struct phy *phy)
321 {
322 struct mixel_dphy_priv *priv = phy_get_drvdata(phy);
323
324 phy_write(phy, priv->cfg.m_prg_hs_prepare, DPHY_M_PRG_HS_PREPARE);
325 phy_write(phy, priv->cfg.mc_prg_hs_prepare, DPHY_MC_PRG_HS_PREPARE);
326 phy_write(phy, priv->cfg.m_prg_hs_zero, DPHY_M_PRG_HS_ZERO);
327 phy_write(phy, priv->cfg.mc_prg_hs_zero, DPHY_MC_PRG_HS_ZERO);
328 phy_write(phy, priv->cfg.m_prg_hs_trail, DPHY_M_PRG_HS_TRAIL);
329 phy_write(phy, priv->cfg.mc_prg_hs_trail, DPHY_MC_PRG_HS_TRAIL);
330 phy_write(phy, priv->cfg.rxhs_settle, priv->devdata->reg_rxhs_settle);
331 }
332
mixel_dphy_set_pll_params(struct phy * phy)333 static int mixel_dphy_set_pll_params(struct phy *phy)
334 {
335 struct mixel_dphy_priv *priv = dev_get_drvdata(phy->dev.parent);
336
337 if (priv->cfg.cm < 16 || priv->cfg.cm > 255 ||
338 priv->cfg.cn < 1 || priv->cfg.cn > 32 ||
339 priv->cfg.co < 1 || priv->cfg.co > 8) {
340 dev_err(&phy->dev, "Invalid CM/CN/CO values! (%u/%u/%u)\n",
341 priv->cfg.cm, priv->cfg.cn, priv->cfg.co);
342 return -EINVAL;
343 }
344 dev_dbg(&phy->dev, "Using CM:%u CN:%u CO:%u\n",
345 priv->cfg.cm, priv->cfg.cn, priv->cfg.co);
346 phy_write(phy, CM(priv->cfg.cm), DPHY_CM);
347 phy_write(phy, CN(priv->cfg.cn), DPHY_CN);
348 phy_write(phy, CO(priv->cfg.co), DPHY_CO);
349 return 0;
350 }
351
352 static int
mixel_dphy_configure_mipi_dphy(struct phy * phy,union phy_configure_opts * opts)353 mixel_dphy_configure_mipi_dphy(struct phy *phy, union phy_configure_opts *opts)
354 {
355 struct mixel_dphy_priv *priv = phy_get_drvdata(phy);
356 struct mixel_dphy_cfg cfg = { 0 };
357 int ret;
358
359 ret = mixel_dphy_config_from_opts(phy, &opts->mipi_dphy, &cfg);
360 if (ret)
361 return ret;
362
363 /* Update the configuration */
364 memcpy(&priv->cfg, &cfg, sizeof(struct mixel_dphy_cfg));
365
366 phy_write(phy, 0x00, DPHY_LOCK_BYP);
367 phy_write(phy, 0x01, priv->devdata->reg_tx_rcal);
368 phy_write(phy, 0x00, priv->devdata->reg_auto_pd_en);
369 phy_write(phy, 0x02, priv->devdata->reg_rxlprp);
370 phy_write(phy, 0x02, priv->devdata->reg_rxcdrp);
371 phy_write(phy, 0x25, DPHY_TST);
372
373 mixel_phy_set_hs_timings(phy);
374 ret = mixel_dphy_set_pll_params(phy);
375 if (ret < 0)
376 return ret;
377
378 return 0;
379 }
380
381 static int
mixel_dphy_configure_lvds_phy(struct phy * phy,union phy_configure_opts * opts)382 mixel_dphy_configure_lvds_phy(struct phy *phy, union phy_configure_opts *opts)
383 {
384 struct mixel_dphy_priv *priv = phy_get_drvdata(phy);
385 struct phy_configure_opts_lvds *lvds_opts = &opts->lvds;
386 unsigned long data_rate;
387 unsigned long fvco;
388 u32 rsc;
389 u32 co;
390 int ret;
391
392 priv->is_slave = lvds_opts->is_slave;
393
394 /* LVDS interface pins */
395 regmap_write(priv->lvds_regmap, PHY_CTRL,
396 CCM(CCM_1_2V) | CA(CA_3_51MA) | RFB);
397
398 /* enable MODE8 only for slave LVDS PHY */
399 rsc = priv->id ? IMX_SC_R_MIPI_1 : IMX_SC_R_MIPI_0;
400 ret = imx_sc_misc_set_control(priv->ipc_handle, rsc, IMX_SC_C_DUAL_MODE,
401 lvds_opts->is_slave);
402 if (ret) {
403 dev_err(&phy->dev, "Failed to configure MODE8: %d\n", ret);
404 return ret;
405 }
406
407 /*
408 * Choose an appropriate divider ratio to meet the requirement of
409 * PLL VCO frequency range.
410 *
411 * ----- 640MHz ~ 1500MHz ------------ ---------------
412 * | VCO | ----------------> | CO divider | -> | LVDS data rate|
413 * ----- FVCO ------------ ---------------
414 * 1/2/4/8 div 7 * differential_clk_rate
415 */
416 data_rate = 7 * lvds_opts->differential_clk_rate;
417 for (co = 1; co <= 8; co *= 2) {
418 fvco = data_rate * co;
419
420 if (fvco >= MIN_VCO_FREQ)
421 break;
422 }
423
424 if (fvco < MIN_VCO_FREQ || fvco > MAX_VCO_FREQ) {
425 dev_err(&phy->dev, "VCO frequency %lu is out of range\n", fvco);
426 return -ERANGE;
427 }
428
429 /*
430 * CO is configurable, while CN and CM are not,
431 * as fixed ratios 1 and 7 are applied respectively.
432 */
433 phy_write(phy, __ffs(co), DPHY_CO);
434
435 /* set reference clock rate */
436 clk_set_rate(priv->phy_ref_clk, lvds_opts->differential_clk_rate);
437
438 return ret;
439 }
440
mixel_dphy_configure(struct phy * phy,union phy_configure_opts * opts)441 static int mixel_dphy_configure(struct phy *phy, union phy_configure_opts *opts)
442 {
443 if (!opts) {
444 dev_err(&phy->dev, "No configuration options\n");
445 return -EINVAL;
446 }
447
448 if (phy->attrs.mode == PHY_MODE_MIPI_DPHY)
449 return mixel_dphy_configure_mipi_dphy(phy, opts);
450 else if (phy->attrs.mode == PHY_MODE_LVDS)
451 return mixel_dphy_configure_lvds_phy(phy, opts);
452
453 dev_err(&phy->dev,
454 "Failed to configure PHY with invalid PHY mode: %d\n", phy->attrs.mode);
455
456 return -EINVAL;
457 }
458
459 static int
mixel_dphy_validate_lvds_phy(struct phy * phy,union phy_configure_opts * opts)460 mixel_dphy_validate_lvds_phy(struct phy *phy, union phy_configure_opts *opts)
461 {
462 struct phy_configure_opts_lvds *lvds_cfg = &opts->lvds;
463
464 if (lvds_cfg->bits_per_lane_and_dclk_cycle != 7) {
465 dev_err(&phy->dev, "Invalid bits per LVDS data lane: %u\n",
466 lvds_cfg->bits_per_lane_and_dclk_cycle);
467 return -EINVAL;
468 }
469
470 if (lvds_cfg->lanes != 4) {
471 dev_err(&phy->dev, "Invalid LVDS data lanes: %u\n", lvds_cfg->lanes);
472 return -EINVAL;
473 }
474
475 if (lvds_cfg->differential_clk_rate < MIN_LVDS_REFCLK_FREQ ||
476 lvds_cfg->differential_clk_rate > MAX_LVDS_REFCLK_FREQ) {
477 dev_err(&phy->dev,
478 "Invalid LVDS differential clock rate: %lu\n",
479 lvds_cfg->differential_clk_rate);
480 return -EINVAL;
481 }
482
483 return 0;
484 }
485
mixel_dphy_validate(struct phy * phy,enum phy_mode mode,int submode,union phy_configure_opts * opts)486 static int mixel_dphy_validate(struct phy *phy, enum phy_mode mode, int submode,
487 union phy_configure_opts *opts)
488 {
489 if (mode == PHY_MODE_MIPI_DPHY) {
490 struct mixel_dphy_cfg mipi_dphy_cfg = { 0 };
491
492 return mixel_dphy_config_from_opts(phy, &opts->mipi_dphy,
493 &mipi_dphy_cfg);
494 } else if (mode == PHY_MODE_LVDS) {
495 return mixel_dphy_validate_lvds_phy(phy, opts);
496 }
497
498 dev_err(&phy->dev,
499 "Failed to validate PHY with invalid PHY mode: %d\n", mode);
500 return -EINVAL;
501 }
502
mixel_dphy_init(struct phy * phy)503 static int mixel_dphy_init(struct phy *phy)
504 {
505 phy_write(phy, PWR_OFF, DPHY_PD_PLL);
506 phy_write(phy, PWR_OFF, DPHY_PD_DPHY);
507
508 return 0;
509 }
510
mixel_dphy_exit(struct phy * phy)511 static int mixel_dphy_exit(struct phy *phy)
512 {
513 phy_write(phy, 0, DPHY_CM);
514 phy_write(phy, 0, DPHY_CN);
515 phy_write(phy, 0, DPHY_CO);
516
517 return 0;
518 }
519
mixel_dphy_power_on_mipi_dphy(struct phy * phy)520 static int mixel_dphy_power_on_mipi_dphy(struct phy *phy)
521 {
522 struct mixel_dphy_priv *priv = phy_get_drvdata(phy);
523 u32 locked;
524 int ret;
525
526 phy_write(phy, PWR_ON, DPHY_PD_PLL);
527 ret = regmap_read_poll_timeout(priv->regmap, DPHY_LOCK, locked,
528 locked, PLL_LOCK_SLEEP,
529 PLL_LOCK_TIMEOUT);
530 if (ret < 0) {
531 dev_err(&phy->dev, "Could not get DPHY lock (%d)!\n", ret);
532 return ret;
533 }
534 phy_write(phy, PWR_ON, DPHY_PD_DPHY);
535
536 return 0;
537 }
538
mixel_dphy_power_on_lvds_phy(struct phy * phy)539 static int mixel_dphy_power_on_lvds_phy(struct phy *phy)
540 {
541 struct mixel_dphy_priv *priv = phy_get_drvdata(phy);
542 u32 locked;
543 int ret;
544
545 regmap_update_bits(priv->lvds_regmap, PHY_CTRL, LVDS_EN, LVDS_EN);
546
547 phy_write(phy, PWR_ON, DPHY_PD_DPHY);
548 phy_write(phy, PWR_ON, DPHY_PD_PLL);
549
550 /* do not wait for slave LVDS PHY being locked */
551 if (priv->is_slave)
552 return 0;
553
554 ret = regmap_read_poll_timeout(priv->regmap, DPHY_LOCK, locked,
555 locked, PLL_LOCK_SLEEP,
556 PLL_LOCK_TIMEOUT);
557 if (ret < 0) {
558 dev_err(&phy->dev, "Could not get LVDS PHY lock (%d)!\n", ret);
559 return ret;
560 }
561
562 return 0;
563 }
564
mixel_dphy_power_on(struct phy * phy)565 static int mixel_dphy_power_on(struct phy *phy)
566 {
567 struct mixel_dphy_priv *priv = phy_get_drvdata(phy);
568 int ret;
569
570 ret = clk_prepare_enable(priv->phy_ref_clk);
571 if (ret < 0)
572 return ret;
573
574 if (phy->attrs.mode == PHY_MODE_MIPI_DPHY) {
575 ret = mixel_dphy_power_on_mipi_dphy(phy);
576 } else if (phy->attrs.mode == PHY_MODE_LVDS) {
577 ret = mixel_dphy_power_on_lvds_phy(phy);
578 } else {
579 dev_err(&phy->dev,
580 "Failed to power on PHY with invalid PHY mode: %d\n",
581 phy->attrs.mode);
582 ret = -EINVAL;
583 }
584
585 if (ret)
586 goto clock_disable;
587
588 return 0;
589 clock_disable:
590 clk_disable_unprepare(priv->phy_ref_clk);
591 return ret;
592 }
593
mixel_dphy_power_off(struct phy * phy)594 static int mixel_dphy_power_off(struct phy *phy)
595 {
596 struct mixel_dphy_priv *priv = phy_get_drvdata(phy);
597
598 phy_write(phy, PWR_OFF, DPHY_PD_PLL);
599 phy_write(phy, PWR_OFF, DPHY_PD_DPHY);
600
601 if (phy->attrs.mode == PHY_MODE_LVDS)
602 regmap_update_bits(priv->lvds_regmap, PHY_CTRL, LVDS_EN, 0);
603
604 clk_disable_unprepare(priv->phy_ref_clk);
605
606 return 0;
607 }
608
mixel_dphy_set_mode(struct phy * phy,enum phy_mode mode,int submode)609 static int mixel_dphy_set_mode(struct phy *phy, enum phy_mode mode, int submode)
610 {
611 struct mixel_dphy_priv *priv = phy_get_drvdata(phy);
612 int ret;
613
614 if (priv->devdata->is_combo && mode != PHY_MODE_LVDS) {
615 dev_err(&phy->dev, "Failed to set PHY mode for combo PHY\n");
616 return -EINVAL;
617 }
618
619 if (!priv->devdata->is_combo && mode != PHY_MODE_MIPI_DPHY) {
620 dev_err(&phy->dev, "Failed to set PHY mode to MIPI DPHY\n");
621 return -EINVAL;
622 }
623
624 if (priv->devdata->is_combo) {
625 u32 rsc = priv->id ? IMX_SC_R_MIPI_1 : IMX_SC_R_MIPI_0;
626
627 ret = imx_sc_misc_set_control(priv->ipc_handle,
628 rsc, IMX_SC_C_MODE,
629 mode == PHY_MODE_LVDS);
630 if (ret) {
631 dev_err(&phy->dev,
632 "Failed to set PHY mode via SCU ipc: %d\n", ret);
633 return ret;
634 }
635 }
636
637 return 0;
638 }
639
640 static const struct phy_ops mixel_dphy_phy_ops = {
641 .init = mixel_dphy_init,
642 .exit = mixel_dphy_exit,
643 .power_on = mixel_dphy_power_on,
644 .power_off = mixel_dphy_power_off,
645 .set_mode = mixel_dphy_set_mode,
646 .configure = mixel_dphy_configure,
647 .validate = mixel_dphy_validate,
648 .owner = THIS_MODULE,
649 };
650
651 static const struct of_device_id mixel_dphy_of_match[] = {
652 { .compatible = "fsl,imx8mq-mipi-dphy",
653 .data = &mixel_dphy_devdata[MIXEL_IMX8MQ] },
654 { .compatible = "fsl,imx8qxp-mipi-dphy",
655 .data = &mixel_dphy_devdata[MIXEL_IMX8QXP] },
656 { /* sentinel */ },
657 };
658 MODULE_DEVICE_TABLE(of, mixel_dphy_of_match);
659
mixel_dphy_probe(struct platform_device * pdev)660 static int mixel_dphy_probe(struct platform_device *pdev)
661 {
662 struct device *dev = &pdev->dev;
663 struct device_node *np = dev->of_node;
664 struct phy_provider *phy_provider;
665 struct mixel_dphy_priv *priv;
666 struct phy *phy;
667 void __iomem *base;
668 int ret;
669
670 if (!np)
671 return -ENODEV;
672
673 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
674 if (!priv)
675 return -ENOMEM;
676
677 priv->devdata = of_device_get_match_data(&pdev->dev);
678 if (!priv->devdata)
679 return -EINVAL;
680
681 base = devm_platform_ioremap_resource(pdev, 0);
682 if (IS_ERR(base))
683 return PTR_ERR(base);
684
685 priv->regmap = devm_regmap_init_mmio(&pdev->dev, base,
686 &mixel_dphy_regmap_config);
687 if (IS_ERR(priv->regmap)) {
688 dev_err(dev, "Couldn't create the DPHY regmap\n");
689 return PTR_ERR(priv->regmap);
690 }
691
692 priv->phy_ref_clk = devm_clk_get(&pdev->dev, "phy_ref");
693 if (IS_ERR(priv->phy_ref_clk)) {
694 dev_err(dev, "No phy_ref clock found\n");
695 return PTR_ERR(priv->phy_ref_clk);
696 }
697 dev_dbg(dev, "phy_ref clock rate: %lu\n",
698 clk_get_rate(priv->phy_ref_clk));
699
700 if (priv->devdata->is_combo) {
701 priv->lvds_regmap =
702 syscon_regmap_lookup_by_phandle(np, "fsl,syscon");
703 if (IS_ERR(priv->lvds_regmap)) {
704 ret = PTR_ERR(priv->lvds_regmap);
705 dev_err_probe(dev, ret, "Failed to get LVDS regmap\n");
706 return ret;
707 }
708
709 priv->id = of_alias_get_id(np, "mipi-dphy");
710 if (priv->id < 0) {
711 dev_err(dev, "Failed to get phy node alias id: %d\n",
712 priv->id);
713 return priv->id;
714 }
715
716 ret = imx_scu_get_handle(&priv->ipc_handle);
717 if (ret) {
718 dev_err_probe(dev, ret,
719 "Failed to get SCU ipc handle\n");
720 return ret;
721 }
722 }
723
724 dev_set_drvdata(dev, priv);
725
726 phy = devm_phy_create(dev, np, &mixel_dphy_phy_ops);
727 if (IS_ERR(phy)) {
728 dev_err(dev, "Failed to create phy %ld\n", PTR_ERR(phy));
729 return PTR_ERR(phy);
730 }
731 phy_set_drvdata(phy, priv);
732
733 phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
734
735 return PTR_ERR_OR_ZERO(phy_provider);
736 }
737
738 static struct platform_driver mixel_dphy_driver = {
739 .probe = mixel_dphy_probe,
740 .driver = {
741 .name = "mixel-mipi-dphy",
742 .of_match_table = mixel_dphy_of_match,
743 }
744 };
745 module_platform_driver(mixel_dphy_driver);
746
747 MODULE_AUTHOR("NXP Semiconductor");
748 MODULE_DESCRIPTION("Mixel MIPI-DSI PHY driver");
749 MODULE_LICENSE("GPL");
750