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Merge remote-tracking branch 'kspp/for-next/kspp'
[deliverable/linux.git] / drivers / gpu / host1x / mipi.c
1 /*
2 * Copyright (C) 2013 NVIDIA Corporation
3 *
4 * Permission to use, copy, modify, distribute, and sell this software and its
5 * documentation for any purpose is hereby granted without fee, provided that
6 * the above copyright notice appear in all copies and that both that copyright
7 * notice and this permission notice appear in supporting documentation, and
8 * that the name of the copyright holders not be used in advertising or
9 * publicity pertaining to distribution of the software without specific,
10 * written prior permission. The copyright holders make no representations
11 * about the suitability of this software for any purpose. It is provided "as
12 * is" without express or implied warranty.
13 *
14 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
15 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
16 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
17 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
18 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
19 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
20 * OF THIS SOFTWARE.
21 */
22
23 #include <linux/clk.h>
24 #include <linux/delay.h>
25 #include <linux/host1x.h>
26 #include <linux/io.h>
27 #include <linux/of_platform.h>
28 #include <linux/platform_device.h>
29 #include <linux/slab.h>
30
31 #include "dev.h"
32
33 #define MIPI_CAL_CTRL 0x00
34 #define MIPI_CAL_CTRL_NOISE_FILTER(x) (((x) & 0xf) << 26)
35 #define MIPI_CAL_CTRL_PRESCALE(x) (((x) & 0x3) << 24)
36 #define MIPI_CAL_CTRL_CLKEN_OVR (1 << 4)
37 #define MIPI_CAL_CTRL_START (1 << 0)
38
39 #define MIPI_CAL_AUTOCAL_CTRL 0x01
40
41 #define MIPI_CAL_STATUS 0x02
42 #define MIPI_CAL_STATUS_DONE (1 << 16)
43 #define MIPI_CAL_STATUS_ACTIVE (1 << 0)
44
45 #define MIPI_CAL_CONFIG_CSIA 0x05
46 #define MIPI_CAL_CONFIG_CSIB 0x06
47 #define MIPI_CAL_CONFIG_CSIC 0x07
48 #define MIPI_CAL_CONFIG_CSID 0x08
49 #define MIPI_CAL_CONFIG_CSIE 0x09
50 #define MIPI_CAL_CONFIG_CSIF 0x0a
51 #define MIPI_CAL_CONFIG_DSIA 0x0e
52 #define MIPI_CAL_CONFIG_DSIB 0x0f
53 #define MIPI_CAL_CONFIG_DSIC 0x10
54 #define MIPI_CAL_CONFIG_DSID 0x11
55
56 #define MIPI_CAL_CONFIG_DSIA_CLK 0x19
57 #define MIPI_CAL_CONFIG_DSIB_CLK 0x1a
58 #define MIPI_CAL_CONFIG_CSIAB_CLK 0x1b
59 #define MIPI_CAL_CONFIG_DSIC_CLK 0x1c
60 #define MIPI_CAL_CONFIG_CSICD_CLK 0x1c
61 #define MIPI_CAL_CONFIG_DSID_CLK 0x1d
62 #define MIPI_CAL_CONFIG_CSIE_CLK 0x1d
63
64 /* for data and clock lanes */
65 #define MIPI_CAL_CONFIG_SELECT (1 << 21)
66
67 /* for data lanes */
68 #define MIPI_CAL_CONFIG_HSPDOS(x) (((x) & 0x1f) << 16)
69 #define MIPI_CAL_CONFIG_HSPUOS(x) (((x) & 0x1f) << 8)
70 #define MIPI_CAL_CONFIG_TERMOS(x) (((x) & 0x1f) << 0)
71
72 /* for clock lanes */
73 #define MIPI_CAL_CONFIG_HSCLKPDOSD(x) (((x) & 0x1f) << 8)
74 #define MIPI_CAL_CONFIG_HSCLKPUOSD(x) (((x) & 0x1f) << 0)
75
76 #define MIPI_CAL_BIAS_PAD_CFG0 0x16
77 #define MIPI_CAL_BIAS_PAD_PDVCLAMP (1 << 1)
78 #define MIPI_CAL_BIAS_PAD_E_VCLAMP_REF (1 << 0)
79
80 #define MIPI_CAL_BIAS_PAD_CFG1 0x17
81 #define MIPI_CAL_BIAS_PAD_DRV_DN_REF(x) (((x) & 0x7) << 16)
82 #define MIPI_CAL_BIAS_PAD_DRV_UP_REF(x) (((x) & 0x7) << 8)
83
84 #define MIPI_CAL_BIAS_PAD_CFG2 0x18
85 #define MIPI_CAL_BIAS_PAD_VCLAMP(x) (((x) & 0x7) << 16)
86 #define MIPI_CAL_BIAS_PAD_VAUXP(x) (((x) & 0x7) << 4)
87 #define MIPI_CAL_BIAS_PAD_PDVREG (1 << 1)
88
89 struct tegra_mipi_pad {
90 unsigned long data;
91 unsigned long clk;
92 };
93
94 struct tegra_mipi_soc {
95 bool has_clk_lane;
96 const struct tegra_mipi_pad *pads;
97 unsigned int num_pads;
98
99 bool clock_enable_override;
100 bool needs_vclamp_ref;
101
102 /* bias pad configuration settings */
103 u8 pad_drive_down_ref;
104 u8 pad_drive_up_ref;
105
106 u8 pad_vclamp_level;
107 u8 pad_vauxp_level;
108
109 /* calibration settings for data lanes */
110 u8 hspdos;
111 u8 hspuos;
112 u8 termos;
113
114 /* calibration settings for clock lanes */
115 u8 hsclkpdos;
116 u8 hsclkpuos;
117 };
118
119 struct tegra_mipi {
120 const struct tegra_mipi_soc *soc;
121 struct device *dev;
122 void __iomem *regs;
123 struct mutex lock;
124 struct clk *clk;
125
126 unsigned long usage_count;
127 };
128
129 struct tegra_mipi_device {
130 struct platform_device *pdev;
131 struct tegra_mipi *mipi;
132 struct device *device;
133 unsigned long pads;
134 };
135
136 static inline u32 tegra_mipi_readl(struct tegra_mipi *mipi,
137 unsigned long offset)
138 {
139 return readl(mipi->regs + (offset << 2));
140 }
141
142 static inline void tegra_mipi_writel(struct tegra_mipi *mipi, u32 value,
143 unsigned long offset)
144 {
145 writel(value, mipi->regs + (offset << 2));
146 }
147
148 static int tegra_mipi_power_up(struct tegra_mipi *mipi)
149 {
150 u32 value;
151 int err;
152
153 err = clk_enable(mipi->clk);
154 if (err < 0)
155 return err;
156
157 value = tegra_mipi_readl(mipi, MIPI_CAL_BIAS_PAD_CFG0);
158 value &= ~MIPI_CAL_BIAS_PAD_PDVCLAMP;
159
160 if (mipi->soc->needs_vclamp_ref)
161 value |= MIPI_CAL_BIAS_PAD_E_VCLAMP_REF;
162
163 tegra_mipi_writel(mipi, value, MIPI_CAL_BIAS_PAD_CFG0);
164
165 value = tegra_mipi_readl(mipi, MIPI_CAL_BIAS_PAD_CFG2);
166 value &= ~MIPI_CAL_BIAS_PAD_PDVREG;
167 tegra_mipi_writel(mipi, value, MIPI_CAL_BIAS_PAD_CFG2);
168
169 clk_disable(mipi->clk);
170
171 return 0;
172 }
173
174 static int tegra_mipi_power_down(struct tegra_mipi *mipi)
175 {
176 u32 value;
177 int err;
178
179 err = clk_enable(mipi->clk);
180 if (err < 0)
181 return err;
182
183 /*
184 * The MIPI_CAL_BIAS_PAD_PDVREG controls a voltage regulator that
185 * supplies the DSI pads. This must be kept enabled until none of the
186 * DSI lanes are used anymore.
187 */
188 value = tegra_mipi_readl(mipi, MIPI_CAL_BIAS_PAD_CFG2);
189 value |= MIPI_CAL_BIAS_PAD_PDVREG;
190 tegra_mipi_writel(mipi, value, MIPI_CAL_BIAS_PAD_CFG2);
191
192 /*
193 * MIPI_CAL_BIAS_PAD_PDVCLAMP and MIPI_CAL_BIAS_PAD_E_VCLAMP_REF
194 * control a regulator that supplies current to the pre-driver logic.
195 * Powering down this regulator causes DSI to fail, so it must remain
196 * powered on until none of the DSI lanes are used anymore.
197 */
198 value = tegra_mipi_readl(mipi, MIPI_CAL_BIAS_PAD_CFG0);
199
200 if (mipi->soc->needs_vclamp_ref)
201 value &= ~MIPI_CAL_BIAS_PAD_E_VCLAMP_REF;
202
203 value |= MIPI_CAL_BIAS_PAD_PDVCLAMP;
204 tegra_mipi_writel(mipi, value, MIPI_CAL_BIAS_PAD_CFG0);
205
206 return 0;
207 }
208
209 struct tegra_mipi_device *tegra_mipi_request(struct device *device)
210 {
211 struct device_node *np = device->of_node;
212 struct tegra_mipi_device *dev;
213 struct of_phandle_args args;
214 int err;
215
216 err = of_parse_phandle_with_args(np, "nvidia,mipi-calibrate",
217 "#nvidia,mipi-calibrate-cells", 0,
218 &args);
219 if (err < 0)
220 return ERR_PTR(err);
221
222 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
223 if (!dev) {
224 err = -ENOMEM;
225 goto out;
226 }
227
228 dev->pdev = of_find_device_by_node(args.np);
229 if (!dev->pdev) {
230 err = -ENODEV;
231 goto free;
232 }
233
234 dev->mipi = platform_get_drvdata(dev->pdev);
235 if (!dev->mipi) {
236 err = -EPROBE_DEFER;
237 goto put;
238 }
239
240 of_node_put(args.np);
241
242 dev->pads = args.args[0];
243 dev->device = device;
244
245 return dev;
246
247 put:
248 platform_device_put(dev->pdev);
249 free:
250 kfree(dev);
251 out:
252 of_node_put(args.np);
253 return ERR_PTR(err);
254 }
255 EXPORT_SYMBOL(tegra_mipi_request);
256
257 void tegra_mipi_free(struct tegra_mipi_device *device)
258 {
259 platform_device_put(device->pdev);
260 kfree(device);
261 }
262 EXPORT_SYMBOL(tegra_mipi_free);
263
264 int tegra_mipi_enable(struct tegra_mipi_device *dev)
265 {
266 int err = 0;
267
268 mutex_lock(&dev->mipi->lock);
269
270 if (dev->mipi->usage_count++ == 0)
271 err = tegra_mipi_power_up(dev->mipi);
272
273 mutex_unlock(&dev->mipi->lock);
274
275 return err;
276
277 }
278 EXPORT_SYMBOL(tegra_mipi_enable);
279
280 int tegra_mipi_disable(struct tegra_mipi_device *dev)
281 {
282 int err = 0;
283
284 mutex_lock(&dev->mipi->lock);
285
286 if (--dev->mipi->usage_count == 0)
287 err = tegra_mipi_power_down(dev->mipi);
288
289 mutex_unlock(&dev->mipi->lock);
290
291 return err;
292
293 }
294 EXPORT_SYMBOL(tegra_mipi_disable);
295
296 static int tegra_mipi_wait(struct tegra_mipi *mipi)
297 {
298 unsigned long timeout = jiffies + msecs_to_jiffies(250);
299 u32 value;
300
301 while (time_before(jiffies, timeout)) {
302 value = tegra_mipi_readl(mipi, MIPI_CAL_STATUS);
303 if ((value & MIPI_CAL_STATUS_ACTIVE) == 0 &&
304 (value & MIPI_CAL_STATUS_DONE) != 0)
305 return 0;
306
307 usleep_range(10, 50);
308 }
309
310 return -ETIMEDOUT;
311 }
312
313 int tegra_mipi_calibrate(struct tegra_mipi_device *device)
314 {
315 const struct tegra_mipi_soc *soc = device->mipi->soc;
316 unsigned int i;
317 u32 value;
318 int err;
319
320 err = clk_enable(device->mipi->clk);
321 if (err < 0)
322 return err;
323
324 mutex_lock(&device->mipi->lock);
325
326 value = MIPI_CAL_BIAS_PAD_DRV_DN_REF(soc->pad_drive_down_ref) |
327 MIPI_CAL_BIAS_PAD_DRV_UP_REF(soc->pad_drive_up_ref);
328 tegra_mipi_writel(device->mipi, value, MIPI_CAL_BIAS_PAD_CFG1);
329
330 value = tegra_mipi_readl(device->mipi, MIPI_CAL_BIAS_PAD_CFG2);
331 value &= ~MIPI_CAL_BIAS_PAD_VCLAMP(0x7);
332 value &= ~MIPI_CAL_BIAS_PAD_VAUXP(0x7);
333 value |= MIPI_CAL_BIAS_PAD_VCLAMP(soc->pad_vclamp_level);
334 value |= MIPI_CAL_BIAS_PAD_VAUXP(soc->pad_vauxp_level);
335 tegra_mipi_writel(device->mipi, value, MIPI_CAL_BIAS_PAD_CFG2);
336
337 for (i = 0; i < soc->num_pads; i++) {
338 u32 clk = 0, data = 0;
339
340 if (device->pads & BIT(i)) {
341 data = MIPI_CAL_CONFIG_SELECT |
342 MIPI_CAL_CONFIG_HSPDOS(soc->hspdos) |
343 MIPI_CAL_CONFIG_HSPUOS(soc->hspuos) |
344 MIPI_CAL_CONFIG_TERMOS(soc->termos);
345 clk = MIPI_CAL_CONFIG_SELECT |
346 MIPI_CAL_CONFIG_HSCLKPDOSD(soc->hsclkpdos) |
347 MIPI_CAL_CONFIG_HSCLKPUOSD(soc->hsclkpuos);
348 }
349
350 tegra_mipi_writel(device->mipi, data, soc->pads[i].data);
351
352 if (soc->has_clk_lane && soc->pads[i].clk != 0)
353 tegra_mipi_writel(device->mipi, clk, soc->pads[i].clk);
354 }
355
356 value = tegra_mipi_readl(device->mipi, MIPI_CAL_CTRL);
357 value &= ~MIPI_CAL_CTRL_NOISE_FILTER(0xf);
358 value &= ~MIPI_CAL_CTRL_PRESCALE(0x3);
359 value |= MIPI_CAL_CTRL_NOISE_FILTER(0xa);
360 value |= MIPI_CAL_CTRL_PRESCALE(0x2);
361
362 if (!soc->clock_enable_override)
363 value &= ~MIPI_CAL_CTRL_CLKEN_OVR;
364 else
365 value |= MIPI_CAL_CTRL_CLKEN_OVR;
366
367 tegra_mipi_writel(device->mipi, value, MIPI_CAL_CTRL);
368
369 /* clear any pending status bits */
370 value = tegra_mipi_readl(device->mipi, MIPI_CAL_STATUS);
371 tegra_mipi_writel(device->mipi, value, MIPI_CAL_STATUS);
372
373 value = tegra_mipi_readl(device->mipi, MIPI_CAL_CTRL);
374 value |= MIPI_CAL_CTRL_START;
375 tegra_mipi_writel(device->mipi, value, MIPI_CAL_CTRL);
376
377 err = tegra_mipi_wait(device->mipi);
378
379 mutex_unlock(&device->mipi->lock);
380 clk_disable(device->mipi->clk);
381
382 return err;
383 }
384 EXPORT_SYMBOL(tegra_mipi_calibrate);
385
386 static const struct tegra_mipi_pad tegra114_mipi_pads[] = {
387 { .data = MIPI_CAL_CONFIG_CSIA },
388 { .data = MIPI_CAL_CONFIG_CSIB },
389 { .data = MIPI_CAL_CONFIG_CSIC },
390 { .data = MIPI_CAL_CONFIG_CSID },
391 { .data = MIPI_CAL_CONFIG_CSIE },
392 { .data = MIPI_CAL_CONFIG_DSIA },
393 { .data = MIPI_CAL_CONFIG_DSIB },
394 { .data = MIPI_CAL_CONFIG_DSIC },
395 { .data = MIPI_CAL_CONFIG_DSID },
396 };
397
398 static const struct tegra_mipi_soc tegra114_mipi_soc = {
399 .has_clk_lane = false,
400 .pads = tegra114_mipi_pads,
401 .num_pads = ARRAY_SIZE(tegra114_mipi_pads),
402 .clock_enable_override = true,
403 .needs_vclamp_ref = true,
404 .pad_drive_down_ref = 0x2,
405 .pad_drive_up_ref = 0x0,
406 .pad_vclamp_level = 0x0,
407 .pad_vauxp_level = 0x0,
408 .hspdos = 0x0,
409 .hspuos = 0x4,
410 .termos = 0x5,
411 .hsclkpdos = 0x0,
412 .hsclkpuos = 0x4,
413 };
414
415 static const struct tegra_mipi_pad tegra124_mipi_pads[] = {
416 { .data = MIPI_CAL_CONFIG_CSIA, .clk = MIPI_CAL_CONFIG_CSIAB_CLK },
417 { .data = MIPI_CAL_CONFIG_CSIB, .clk = MIPI_CAL_CONFIG_CSIAB_CLK },
418 { .data = MIPI_CAL_CONFIG_CSIC, .clk = MIPI_CAL_CONFIG_CSICD_CLK },
419 { .data = MIPI_CAL_CONFIG_CSID, .clk = MIPI_CAL_CONFIG_CSICD_CLK },
420 { .data = MIPI_CAL_CONFIG_CSIE, .clk = MIPI_CAL_CONFIG_CSIE_CLK },
421 { .data = MIPI_CAL_CONFIG_DSIA, .clk = MIPI_CAL_CONFIG_DSIA_CLK },
422 { .data = MIPI_CAL_CONFIG_DSIB, .clk = MIPI_CAL_CONFIG_DSIB_CLK },
423 };
424
425 static const struct tegra_mipi_soc tegra124_mipi_soc = {
426 .has_clk_lane = true,
427 .pads = tegra124_mipi_pads,
428 .num_pads = ARRAY_SIZE(tegra124_mipi_pads),
429 .clock_enable_override = true,
430 .needs_vclamp_ref = true,
431 .pad_drive_down_ref = 0x2,
432 .pad_drive_up_ref = 0x0,
433 .pad_vclamp_level = 0x0,
434 .pad_vauxp_level = 0x0,
435 .hspdos = 0x0,
436 .hspuos = 0x0,
437 .termos = 0x0,
438 .hsclkpdos = 0x1,
439 .hsclkpuos = 0x2,
440 };
441
442 static const struct tegra_mipi_soc tegra132_mipi_soc = {
443 .has_clk_lane = true,
444 .pads = tegra124_mipi_pads,
445 .num_pads = ARRAY_SIZE(tegra124_mipi_pads),
446 .clock_enable_override = false,
447 .needs_vclamp_ref = false,
448 .pad_drive_down_ref = 0x0,
449 .pad_drive_up_ref = 0x3,
450 .pad_vclamp_level = 0x0,
451 .pad_vauxp_level = 0x0,
452 .hspdos = 0x0,
453 .hspuos = 0x0,
454 .termos = 0x0,
455 .hsclkpdos = 0x3,
456 .hsclkpuos = 0x2,
457 };
458
459 static const struct tegra_mipi_pad tegra210_mipi_pads[] = {
460 { .data = MIPI_CAL_CONFIG_CSIA, .clk = 0 },
461 { .data = MIPI_CAL_CONFIG_CSIB, .clk = 0 },
462 { .data = MIPI_CAL_CONFIG_CSIC, .clk = 0 },
463 { .data = MIPI_CAL_CONFIG_CSID, .clk = 0 },
464 { .data = MIPI_CAL_CONFIG_CSIE, .clk = 0 },
465 { .data = MIPI_CAL_CONFIG_CSIF, .clk = 0 },
466 { .data = MIPI_CAL_CONFIG_DSIA, .clk = MIPI_CAL_CONFIG_DSIA_CLK },
467 { .data = MIPI_CAL_CONFIG_DSIB, .clk = MIPI_CAL_CONFIG_DSIB_CLK },
468 { .data = MIPI_CAL_CONFIG_DSIC, .clk = MIPI_CAL_CONFIG_DSIC_CLK },
469 { .data = MIPI_CAL_CONFIG_DSID, .clk = MIPI_CAL_CONFIG_DSID_CLK },
470 };
471
472 static const struct tegra_mipi_soc tegra210_mipi_soc = {
473 .has_clk_lane = true,
474 .pads = tegra210_mipi_pads,
475 .num_pads = ARRAY_SIZE(tegra210_mipi_pads),
476 .clock_enable_override = true,
477 .needs_vclamp_ref = false,
478 .pad_drive_down_ref = 0x0,
479 .pad_drive_up_ref = 0x3,
480 .pad_vclamp_level = 0x1,
481 .pad_vauxp_level = 0x1,
482 .hspdos = 0x0,
483 .hspuos = 0x2,
484 .termos = 0x0,
485 .hsclkpdos = 0x0,
486 .hsclkpuos = 0x2,
487 };
488
489 static const struct of_device_id tegra_mipi_of_match[] = {
490 { .compatible = "nvidia,tegra114-mipi", .data = &tegra114_mipi_soc },
491 { .compatible = "nvidia,tegra124-mipi", .data = &tegra124_mipi_soc },
492 { .compatible = "nvidia,tegra132-mipi", .data = &tegra132_mipi_soc },
493 { .compatible = "nvidia,tegra210-mipi", .data = &tegra210_mipi_soc },
494 { },
495 };
496
497 static int tegra_mipi_probe(struct platform_device *pdev)
498 {
499 const struct of_device_id *match;
500 struct tegra_mipi *mipi;
501 struct resource *res;
502 int err;
503
504 match = of_match_node(tegra_mipi_of_match, pdev->dev.of_node);
505 if (!match)
506 return -ENODEV;
507
508 mipi = devm_kzalloc(&pdev->dev, sizeof(*mipi), GFP_KERNEL);
509 if (!mipi)
510 return -ENOMEM;
511
512 mipi->soc = match->data;
513 mipi->dev = &pdev->dev;
514
515 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
516 mipi->regs = devm_ioremap_resource(&pdev->dev, res);
517 if (IS_ERR(mipi->regs))
518 return PTR_ERR(mipi->regs);
519
520 mutex_init(&mipi->lock);
521
522 mipi->clk = devm_clk_get(&pdev->dev, NULL);
523 if (IS_ERR(mipi->clk)) {
524 dev_err(&pdev->dev, "failed to get clock\n");
525 return PTR_ERR(mipi->clk);
526 }
527
528 err = clk_prepare(mipi->clk);
529 if (err < 0)
530 return err;
531
532 platform_set_drvdata(pdev, mipi);
533
534 return 0;
535 }
536
537 static int tegra_mipi_remove(struct platform_device *pdev)
538 {
539 struct tegra_mipi *mipi = platform_get_drvdata(pdev);
540
541 clk_unprepare(mipi->clk);
542
543 return 0;
544 }
545
546 struct platform_driver tegra_mipi_driver = {
547 .driver = {
548 .name = "tegra-mipi",
549 .of_match_table = tegra_mipi_of_match,
550 },
551 .probe = tegra_mipi_probe,
552 .remove = tegra_mipi_remove,
553 };
Linux kernel - Deliverables
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