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Merge branch 'next' of git://git.monstr.eu/linux-2.6-microblaze
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / gpu / drm / radeon / radeon_i2c.c
1 /*
2 * Copyright 2007-8 Advanced Micro Devices, Inc.
3 * Copyright 2008 Red Hat Inc.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
19 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
20 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
21 * OTHER DEALINGS IN THE SOFTWARE.
22 *
23 * Authors: Dave Airlie
24 * Alex Deucher
25 */
26 #include <linux/export.h>
27
28 #include <drm/drmP.h>
29 #include <drm/drm_edid.h>
30 #include <drm/radeon_drm.h>
31 #include "radeon.h"
32 #include "atom.h"
33
34 extern int radeon_atom_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
35 struct i2c_msg *msgs, int num);
36 extern u32 radeon_atom_hw_i2c_func(struct i2c_adapter *adap);
37
38 /**
39 * radeon_ddc_probe
40 *
41 */
42 bool radeon_ddc_probe(struct radeon_connector *radeon_connector, bool use_aux)
43 {
44 u8 out = 0x0;
45 u8 buf[8];
46 int ret;
47 struct i2c_msg msgs[] = {
48 {
49 .addr = DDC_ADDR,
50 .flags = 0,
51 .len = 1,
52 .buf = &out,
53 },
54 {
55 .addr = DDC_ADDR,
56 .flags = I2C_M_RD,
57 .len = 8,
58 .buf = buf,
59 }
60 };
61
62 /* on hw with routers, select right port */
63 if (radeon_connector->router.ddc_valid)
64 radeon_router_select_ddc_port(radeon_connector);
65
66 if (use_aux) {
67 struct radeon_connector_atom_dig *dig = radeon_connector->con_priv;
68 ret = i2c_transfer(&dig->dp_i2c_bus->adapter, msgs, 2);
69 } else {
70 ret = i2c_transfer(&radeon_connector->ddc_bus->adapter, msgs, 2);
71 }
72
73 if (ret != 2)
74 /* Couldn't find an accessible DDC on this connector */
75 return false;
76 /* Probe also for valid EDID header
77 * EDID header starts with:
78 * 0x00,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x00.
79 * Only the first 6 bytes must be valid as
80 * drm_edid_block_valid() can fix the last 2 bytes */
81 if (drm_edid_header_is_valid(buf) < 6) {
82 /* Couldn't find an accessible EDID on this
83 * connector */
84 return false;
85 }
86 return true;
87 }
88
89 /* bit banging i2c */
90
91 static int pre_xfer(struct i2c_adapter *i2c_adap)
92 {
93 struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
94 struct radeon_device *rdev = i2c->dev->dev_private;
95 struct radeon_i2c_bus_rec *rec = &i2c->rec;
96 uint32_t temp;
97
98 /* RV410 appears to have a bug where the hw i2c in reset
99 * holds the i2c port in a bad state - switch hw i2c away before
100 * doing DDC - do this for all r200s/r300s/r400s for safety sake
101 */
102 if (rec->hw_capable) {
103 if ((rdev->family >= CHIP_R200) && !ASIC_IS_AVIVO(rdev)) {
104 u32 reg;
105
106 if (rdev->family >= CHIP_RV350)
107 reg = RADEON_GPIO_MONID;
108 else if ((rdev->family == CHIP_R300) ||
109 (rdev->family == CHIP_R350))
110 reg = RADEON_GPIO_DVI_DDC;
111 else
112 reg = RADEON_GPIO_CRT2_DDC;
113
114 mutex_lock(&rdev->dc_hw_i2c_mutex);
115 if (rec->a_clk_reg == reg) {
116 WREG32(RADEON_DVI_I2C_CNTL_0, (RADEON_I2C_SOFT_RST |
117 R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1)));
118 } else {
119 WREG32(RADEON_DVI_I2C_CNTL_0, (RADEON_I2C_SOFT_RST |
120 R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3)));
121 }
122 mutex_unlock(&rdev->dc_hw_i2c_mutex);
123 }
124 }
125
126 /* switch the pads to ddc mode */
127 if (ASIC_IS_DCE3(rdev) && rec->hw_capable) {
128 temp = RREG32(rec->mask_clk_reg);
129 temp &= ~(1 << 16);
130 WREG32(rec->mask_clk_reg, temp);
131 }
132
133 /* clear the output pin values */
134 temp = RREG32(rec->a_clk_reg) & ~rec->a_clk_mask;
135 WREG32(rec->a_clk_reg, temp);
136
137 temp = RREG32(rec->a_data_reg) & ~rec->a_data_mask;
138 WREG32(rec->a_data_reg, temp);
139
140 /* set the pins to input */
141 temp = RREG32(rec->en_clk_reg) & ~rec->en_clk_mask;
142 WREG32(rec->en_clk_reg, temp);
143
144 temp = RREG32(rec->en_data_reg) & ~rec->en_data_mask;
145 WREG32(rec->en_data_reg, temp);
146
147 /* mask the gpio pins for software use */
148 temp = RREG32(rec->mask_clk_reg) | rec->mask_clk_mask;
149 WREG32(rec->mask_clk_reg, temp);
150 temp = RREG32(rec->mask_clk_reg);
151
152 temp = RREG32(rec->mask_data_reg) | rec->mask_data_mask;
153 WREG32(rec->mask_data_reg, temp);
154 temp = RREG32(rec->mask_data_reg);
155
156 return 0;
157 }
158
159 static void post_xfer(struct i2c_adapter *i2c_adap)
160 {
161 struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
162 struct radeon_device *rdev = i2c->dev->dev_private;
163 struct radeon_i2c_bus_rec *rec = &i2c->rec;
164 uint32_t temp;
165
166 /* unmask the gpio pins for software use */
167 temp = RREG32(rec->mask_clk_reg) & ~rec->mask_clk_mask;
168 WREG32(rec->mask_clk_reg, temp);
169 temp = RREG32(rec->mask_clk_reg);
170
171 temp = RREG32(rec->mask_data_reg) & ~rec->mask_data_mask;
172 WREG32(rec->mask_data_reg, temp);
173 temp = RREG32(rec->mask_data_reg);
174 }
175
176 static int get_clock(void *i2c_priv)
177 {
178 struct radeon_i2c_chan *i2c = i2c_priv;
179 struct radeon_device *rdev = i2c->dev->dev_private;
180 struct radeon_i2c_bus_rec *rec = &i2c->rec;
181 uint32_t val;
182
183 /* read the value off the pin */
184 val = RREG32(rec->y_clk_reg);
185 val &= rec->y_clk_mask;
186
187 return (val != 0);
188 }
189
190
191 static int get_data(void *i2c_priv)
192 {
193 struct radeon_i2c_chan *i2c = i2c_priv;
194 struct radeon_device *rdev = i2c->dev->dev_private;
195 struct radeon_i2c_bus_rec *rec = &i2c->rec;
196 uint32_t val;
197
198 /* read the value off the pin */
199 val = RREG32(rec->y_data_reg);
200 val &= rec->y_data_mask;
201
202 return (val != 0);
203 }
204
205 static void set_clock(void *i2c_priv, int clock)
206 {
207 struct radeon_i2c_chan *i2c = i2c_priv;
208 struct radeon_device *rdev = i2c->dev->dev_private;
209 struct radeon_i2c_bus_rec *rec = &i2c->rec;
210 uint32_t val;
211
212 /* set pin direction */
213 val = RREG32(rec->en_clk_reg) & ~rec->en_clk_mask;
214 val |= clock ? 0 : rec->en_clk_mask;
215 WREG32(rec->en_clk_reg, val);
216 }
217
218 static void set_data(void *i2c_priv, int data)
219 {
220 struct radeon_i2c_chan *i2c = i2c_priv;
221 struct radeon_device *rdev = i2c->dev->dev_private;
222 struct radeon_i2c_bus_rec *rec = &i2c->rec;
223 uint32_t val;
224
225 /* set pin direction */
226 val = RREG32(rec->en_data_reg) & ~rec->en_data_mask;
227 val |= data ? 0 : rec->en_data_mask;
228 WREG32(rec->en_data_reg, val);
229 }
230
231 /* hw i2c */
232
233 static u32 radeon_get_i2c_prescale(struct radeon_device *rdev)
234 {
235 u32 sclk = rdev->pm.current_sclk;
236 u32 prescale = 0;
237 u32 nm;
238 u8 n, m, loop;
239 int i2c_clock;
240
241 switch (rdev->family) {
242 case CHIP_R100:
243 case CHIP_RV100:
244 case CHIP_RS100:
245 case CHIP_RV200:
246 case CHIP_RS200:
247 case CHIP_R200:
248 case CHIP_RV250:
249 case CHIP_RS300:
250 case CHIP_RV280:
251 case CHIP_R300:
252 case CHIP_R350:
253 case CHIP_RV350:
254 i2c_clock = 60;
255 nm = (sclk * 10) / (i2c_clock * 4);
256 for (loop = 1; loop < 255; loop++) {
257 if ((nm / loop) < loop)
258 break;
259 }
260 n = loop - 1;
261 m = loop - 2;
262 prescale = m | (n << 8);
263 break;
264 case CHIP_RV380:
265 case CHIP_RS400:
266 case CHIP_RS480:
267 case CHIP_R420:
268 case CHIP_R423:
269 case CHIP_RV410:
270 prescale = (((sclk * 10)/(4 * 128 * 100) + 1) << 8) + 128;
271 break;
272 case CHIP_RS600:
273 case CHIP_RS690:
274 case CHIP_RS740:
275 /* todo */
276 break;
277 case CHIP_RV515:
278 case CHIP_R520:
279 case CHIP_RV530:
280 case CHIP_RV560:
281 case CHIP_RV570:
282 case CHIP_R580:
283 i2c_clock = 50;
284 if (rdev->family == CHIP_R520)
285 prescale = (127 << 8) + ((sclk * 10) / (4 * 127 * i2c_clock));
286 else
287 prescale = (((sclk * 10)/(4 * 128 * 100) + 1) << 8) + 128;
288 break;
289 case CHIP_R600:
290 case CHIP_RV610:
291 case CHIP_RV630:
292 case CHIP_RV670:
293 /* todo */
294 break;
295 case CHIP_RV620:
296 case CHIP_RV635:
297 case CHIP_RS780:
298 case CHIP_RS880:
299 case CHIP_RV770:
300 case CHIP_RV730:
301 case CHIP_RV710:
302 case CHIP_RV740:
303 /* todo */
304 break;
305 case CHIP_CEDAR:
306 case CHIP_REDWOOD:
307 case CHIP_JUNIPER:
308 case CHIP_CYPRESS:
309 case CHIP_HEMLOCK:
310 /* todo */
311 break;
312 default:
313 DRM_ERROR("i2c: unhandled radeon chip\n");
314 break;
315 }
316 return prescale;
317 }
318
319
320 /* hw i2c engine for r1xx-4xx hardware
321 * hw can buffer up to 15 bytes
322 */
323 static int r100_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
324 struct i2c_msg *msgs, int num)
325 {
326 struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
327 struct radeon_device *rdev = i2c->dev->dev_private;
328 struct radeon_i2c_bus_rec *rec = &i2c->rec;
329 struct i2c_msg *p;
330 int i, j, k, ret = num;
331 u32 prescale;
332 u32 i2c_cntl_0, i2c_cntl_1, i2c_data;
333 u32 tmp, reg;
334
335 mutex_lock(&rdev->dc_hw_i2c_mutex);
336 /* take the pm lock since we need a constant sclk */
337 mutex_lock(&rdev->pm.mutex);
338
339 prescale = radeon_get_i2c_prescale(rdev);
340
341 reg = ((prescale << RADEON_I2C_PRESCALE_SHIFT) |
342 RADEON_I2C_DRIVE_EN |
343 RADEON_I2C_START |
344 RADEON_I2C_STOP |
345 RADEON_I2C_GO);
346
347 if (rdev->is_atom_bios) {
348 tmp = RREG32(RADEON_BIOS_6_SCRATCH);
349 WREG32(RADEON_BIOS_6_SCRATCH, tmp | ATOM_S6_HW_I2C_BUSY_STATE);
350 }
351
352 if (rec->mm_i2c) {
353 i2c_cntl_0 = RADEON_I2C_CNTL_0;
354 i2c_cntl_1 = RADEON_I2C_CNTL_1;
355 i2c_data = RADEON_I2C_DATA;
356 } else {
357 i2c_cntl_0 = RADEON_DVI_I2C_CNTL_0;
358 i2c_cntl_1 = RADEON_DVI_I2C_CNTL_1;
359 i2c_data = RADEON_DVI_I2C_DATA;
360
361 switch (rdev->family) {
362 case CHIP_R100:
363 case CHIP_RV100:
364 case CHIP_RS100:
365 case CHIP_RV200:
366 case CHIP_RS200:
367 case CHIP_RS300:
368 switch (rec->mask_clk_reg) {
369 case RADEON_GPIO_DVI_DDC:
370 /* no gpio select bit */
371 break;
372 default:
373 DRM_ERROR("gpio not supported with hw i2c\n");
374 ret = -EINVAL;
375 goto done;
376 }
377 break;
378 case CHIP_R200:
379 /* only bit 4 on r200 */
380 switch (rec->mask_clk_reg) {
381 case RADEON_GPIO_DVI_DDC:
382 reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1);
383 break;
384 case RADEON_GPIO_MONID:
385 reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3);
386 break;
387 default:
388 DRM_ERROR("gpio not supported with hw i2c\n");
389 ret = -EINVAL;
390 goto done;
391 }
392 break;
393 case CHIP_RV250:
394 case CHIP_RV280:
395 /* bits 3 and 4 */
396 switch (rec->mask_clk_reg) {
397 case RADEON_GPIO_DVI_DDC:
398 reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1);
399 break;
400 case RADEON_GPIO_VGA_DDC:
401 reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC2);
402 break;
403 case RADEON_GPIO_CRT2_DDC:
404 reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3);
405 break;
406 default:
407 DRM_ERROR("gpio not supported with hw i2c\n");
408 ret = -EINVAL;
409 goto done;
410 }
411 break;
412 case CHIP_R300:
413 case CHIP_R350:
414 /* only bit 4 on r300/r350 */
415 switch (rec->mask_clk_reg) {
416 case RADEON_GPIO_VGA_DDC:
417 reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1);
418 break;
419 case RADEON_GPIO_DVI_DDC:
420 reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3);
421 break;
422 default:
423 DRM_ERROR("gpio not supported with hw i2c\n");
424 ret = -EINVAL;
425 goto done;
426 }
427 break;
428 case CHIP_RV350:
429 case CHIP_RV380:
430 case CHIP_R420:
431 case CHIP_R423:
432 case CHIP_RV410:
433 case CHIP_RS400:
434 case CHIP_RS480:
435 /* bits 3 and 4 */
436 switch (rec->mask_clk_reg) {
437 case RADEON_GPIO_VGA_DDC:
438 reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1);
439 break;
440 case RADEON_GPIO_DVI_DDC:
441 reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC2);
442 break;
443 case RADEON_GPIO_MONID:
444 reg |= R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3);
445 break;
446 default:
447 DRM_ERROR("gpio not supported with hw i2c\n");
448 ret = -EINVAL;
449 goto done;
450 }
451 break;
452 default:
453 DRM_ERROR("unsupported asic\n");
454 ret = -EINVAL;
455 goto done;
456 break;
457 }
458 }
459
460 /* check for bus probe */
461 p = &msgs[0];
462 if ((num == 1) && (p->len == 0)) {
463 WREG32(i2c_cntl_0, (RADEON_I2C_DONE |
464 RADEON_I2C_NACK |
465 RADEON_I2C_HALT |
466 RADEON_I2C_SOFT_RST));
467 WREG32(i2c_data, (p->addr << 1) & 0xff);
468 WREG32(i2c_data, 0);
469 WREG32(i2c_cntl_1, ((1 << RADEON_I2C_DATA_COUNT_SHIFT) |
470 (1 << RADEON_I2C_ADDR_COUNT_SHIFT) |
471 RADEON_I2C_EN |
472 (48 << RADEON_I2C_TIME_LIMIT_SHIFT)));
473 WREG32(i2c_cntl_0, reg);
474 for (k = 0; k < 32; k++) {
475 udelay(10);
476 tmp = RREG32(i2c_cntl_0);
477 if (tmp & RADEON_I2C_GO)
478 continue;
479 tmp = RREG32(i2c_cntl_0);
480 if (tmp & RADEON_I2C_DONE)
481 break;
482 else {
483 DRM_DEBUG("i2c write error 0x%08x\n", tmp);
484 WREG32(i2c_cntl_0, tmp | RADEON_I2C_ABORT);
485 ret = -EIO;
486 goto done;
487 }
488 }
489 goto done;
490 }
491
492 for (i = 0; i < num; i++) {
493 p = &msgs[i];
494 for (j = 0; j < p->len; j++) {
495 if (p->flags & I2C_M_RD) {
496 WREG32(i2c_cntl_0, (RADEON_I2C_DONE |
497 RADEON_I2C_NACK |
498 RADEON_I2C_HALT |
499 RADEON_I2C_SOFT_RST));
500 WREG32(i2c_data, ((p->addr << 1) & 0xff) | 0x1);
501 WREG32(i2c_cntl_1, ((1 << RADEON_I2C_DATA_COUNT_SHIFT) |
502 (1 << RADEON_I2C_ADDR_COUNT_SHIFT) |
503 RADEON_I2C_EN |
504 (48 << RADEON_I2C_TIME_LIMIT_SHIFT)));
505 WREG32(i2c_cntl_0, reg | RADEON_I2C_RECEIVE);
506 for (k = 0; k < 32; k++) {
507 udelay(10);
508 tmp = RREG32(i2c_cntl_0);
509 if (tmp & RADEON_I2C_GO)
510 continue;
511 tmp = RREG32(i2c_cntl_0);
512 if (tmp & RADEON_I2C_DONE)
513 break;
514 else {
515 DRM_DEBUG("i2c read error 0x%08x\n", tmp);
516 WREG32(i2c_cntl_0, tmp | RADEON_I2C_ABORT);
517 ret = -EIO;
518 goto done;
519 }
520 }
521 p->buf[j] = RREG32(i2c_data) & 0xff;
522 } else {
523 WREG32(i2c_cntl_0, (RADEON_I2C_DONE |
524 RADEON_I2C_NACK |
525 RADEON_I2C_HALT |
526 RADEON_I2C_SOFT_RST));
527 WREG32(i2c_data, (p->addr << 1) & 0xff);
528 WREG32(i2c_data, p->buf[j]);
529 WREG32(i2c_cntl_1, ((1 << RADEON_I2C_DATA_COUNT_SHIFT) |
530 (1 << RADEON_I2C_ADDR_COUNT_SHIFT) |
531 RADEON_I2C_EN |
532 (48 << RADEON_I2C_TIME_LIMIT_SHIFT)));
533 WREG32(i2c_cntl_0, reg);
534 for (k = 0; k < 32; k++) {
535 udelay(10);
536 tmp = RREG32(i2c_cntl_0);
537 if (tmp & RADEON_I2C_GO)
538 continue;
539 tmp = RREG32(i2c_cntl_0);
540 if (tmp & RADEON_I2C_DONE)
541 break;
542 else {
543 DRM_DEBUG("i2c write error 0x%08x\n", tmp);
544 WREG32(i2c_cntl_0, tmp | RADEON_I2C_ABORT);
545 ret = -EIO;
546 goto done;
547 }
548 }
549 }
550 }
551 }
552
553 done:
554 WREG32(i2c_cntl_0, 0);
555 WREG32(i2c_cntl_1, 0);
556 WREG32(i2c_cntl_0, (RADEON_I2C_DONE |
557 RADEON_I2C_NACK |
558 RADEON_I2C_HALT |
559 RADEON_I2C_SOFT_RST));
560
561 if (rdev->is_atom_bios) {
562 tmp = RREG32(RADEON_BIOS_6_SCRATCH);
563 tmp &= ~ATOM_S6_HW_I2C_BUSY_STATE;
564 WREG32(RADEON_BIOS_6_SCRATCH, tmp);
565 }
566
567 mutex_unlock(&rdev->pm.mutex);
568 mutex_unlock(&rdev->dc_hw_i2c_mutex);
569
570 return ret;
571 }
572
573 /* hw i2c engine for r5xx hardware
574 * hw can buffer up to 15 bytes
575 */
576 static int r500_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
577 struct i2c_msg *msgs, int num)
578 {
579 struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
580 struct radeon_device *rdev = i2c->dev->dev_private;
581 struct radeon_i2c_bus_rec *rec = &i2c->rec;
582 struct i2c_msg *p;
583 int i, j, remaining, current_count, buffer_offset, ret = num;
584 u32 prescale;
585 u32 tmp, reg;
586 u32 saved1, saved2;
587
588 mutex_lock(&rdev->dc_hw_i2c_mutex);
589 /* take the pm lock since we need a constant sclk */
590 mutex_lock(&rdev->pm.mutex);
591
592 prescale = radeon_get_i2c_prescale(rdev);
593
594 /* clear gpio mask bits */
595 tmp = RREG32(rec->mask_clk_reg);
596 tmp &= ~rec->mask_clk_mask;
597 WREG32(rec->mask_clk_reg, tmp);
598 tmp = RREG32(rec->mask_clk_reg);
599
600 tmp = RREG32(rec->mask_data_reg);
601 tmp &= ~rec->mask_data_mask;
602 WREG32(rec->mask_data_reg, tmp);
603 tmp = RREG32(rec->mask_data_reg);
604
605 /* clear pin values */
606 tmp = RREG32(rec->a_clk_reg);
607 tmp &= ~rec->a_clk_mask;
608 WREG32(rec->a_clk_reg, tmp);
609 tmp = RREG32(rec->a_clk_reg);
610
611 tmp = RREG32(rec->a_data_reg);
612 tmp &= ~rec->a_data_mask;
613 WREG32(rec->a_data_reg, tmp);
614 tmp = RREG32(rec->a_data_reg);
615
616 /* set the pins to input */
617 tmp = RREG32(rec->en_clk_reg);
618 tmp &= ~rec->en_clk_mask;
619 WREG32(rec->en_clk_reg, tmp);
620 tmp = RREG32(rec->en_clk_reg);
621
622 tmp = RREG32(rec->en_data_reg);
623 tmp &= ~rec->en_data_mask;
624 WREG32(rec->en_data_reg, tmp);
625 tmp = RREG32(rec->en_data_reg);
626
627 /* */
628 tmp = RREG32(RADEON_BIOS_6_SCRATCH);
629 WREG32(RADEON_BIOS_6_SCRATCH, tmp | ATOM_S6_HW_I2C_BUSY_STATE);
630 saved1 = RREG32(AVIVO_DC_I2C_CONTROL1);
631 saved2 = RREG32(0x494);
632 WREG32(0x494, saved2 | 0x1);
633
634 WREG32(AVIVO_DC_I2C_ARBITRATION, AVIVO_DC_I2C_SW_WANTS_TO_USE_I2C);
635 for (i = 0; i < 50; i++) {
636 udelay(1);
637 if (RREG32(AVIVO_DC_I2C_ARBITRATION) & AVIVO_DC_I2C_SW_CAN_USE_I2C)
638 break;
639 }
640 if (i == 50) {
641 DRM_ERROR("failed to get i2c bus\n");
642 ret = -EBUSY;
643 goto done;
644 }
645
646 reg = AVIVO_DC_I2C_START | AVIVO_DC_I2C_STOP | AVIVO_DC_I2C_EN;
647 switch (rec->mask_clk_reg) {
648 case AVIVO_DC_GPIO_DDC1_MASK:
649 reg |= AVIVO_DC_I2C_PIN_SELECT(AVIVO_SEL_DDC1);
650 break;
651 case AVIVO_DC_GPIO_DDC2_MASK:
652 reg |= AVIVO_DC_I2C_PIN_SELECT(AVIVO_SEL_DDC2);
653 break;
654 case AVIVO_DC_GPIO_DDC3_MASK:
655 reg |= AVIVO_DC_I2C_PIN_SELECT(AVIVO_SEL_DDC3);
656 break;
657 default:
658 DRM_ERROR("gpio not supported with hw i2c\n");
659 ret = -EINVAL;
660 goto done;
661 }
662
663 /* check for bus probe */
664 p = &msgs[0];
665 if ((num == 1) && (p->len == 0)) {
666 WREG32(AVIVO_DC_I2C_STATUS1, (AVIVO_DC_I2C_DONE |
667 AVIVO_DC_I2C_NACK |
668 AVIVO_DC_I2C_HALT));
669 WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_SOFT_RESET);
670 udelay(1);
671 WREG32(AVIVO_DC_I2C_RESET, 0);
672
673 WREG32(AVIVO_DC_I2C_DATA, (p->addr << 1) & 0xff);
674 WREG32(AVIVO_DC_I2C_DATA, 0);
675
676 WREG32(AVIVO_DC_I2C_CONTROL3, AVIVO_DC_I2C_TIME_LIMIT(48));
677 WREG32(AVIVO_DC_I2C_CONTROL2, (AVIVO_DC_I2C_ADDR_COUNT(1) |
678 AVIVO_DC_I2C_DATA_COUNT(1) |
679 (prescale << 16)));
680 WREG32(AVIVO_DC_I2C_CONTROL1, reg);
681 WREG32(AVIVO_DC_I2C_STATUS1, AVIVO_DC_I2C_GO);
682 for (j = 0; j < 200; j++) {
683 udelay(50);
684 tmp = RREG32(AVIVO_DC_I2C_STATUS1);
685 if (tmp & AVIVO_DC_I2C_GO)
686 continue;
687 tmp = RREG32(AVIVO_DC_I2C_STATUS1);
688 if (tmp & AVIVO_DC_I2C_DONE)
689 break;
690 else {
691 DRM_DEBUG("i2c write error 0x%08x\n", tmp);
692 WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_ABORT);
693 ret = -EIO;
694 goto done;
695 }
696 }
697 goto done;
698 }
699
700 for (i = 0; i < num; i++) {
701 p = &msgs[i];
702 remaining = p->len;
703 buffer_offset = 0;
704 if (p->flags & I2C_M_RD) {
705 while (remaining) {
706 if (remaining > 15)
707 current_count = 15;
708 else
709 current_count = remaining;
710 WREG32(AVIVO_DC_I2C_STATUS1, (AVIVO_DC_I2C_DONE |
711 AVIVO_DC_I2C_NACK |
712 AVIVO_DC_I2C_HALT));
713 WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_SOFT_RESET);
714 udelay(1);
715 WREG32(AVIVO_DC_I2C_RESET, 0);
716
717 WREG32(AVIVO_DC_I2C_DATA, ((p->addr << 1) & 0xff) | 0x1);
718 WREG32(AVIVO_DC_I2C_CONTROL3, AVIVO_DC_I2C_TIME_LIMIT(48));
719 WREG32(AVIVO_DC_I2C_CONTROL2, (AVIVO_DC_I2C_ADDR_COUNT(1) |
720 AVIVO_DC_I2C_DATA_COUNT(current_count) |
721 (prescale << 16)));
722 WREG32(AVIVO_DC_I2C_CONTROL1, reg | AVIVO_DC_I2C_RECEIVE);
723 WREG32(AVIVO_DC_I2C_STATUS1, AVIVO_DC_I2C_GO);
724 for (j = 0; j < 200; j++) {
725 udelay(50);
726 tmp = RREG32(AVIVO_DC_I2C_STATUS1);
727 if (tmp & AVIVO_DC_I2C_GO)
728 continue;
729 tmp = RREG32(AVIVO_DC_I2C_STATUS1);
730 if (tmp & AVIVO_DC_I2C_DONE)
731 break;
732 else {
733 DRM_DEBUG("i2c read error 0x%08x\n", tmp);
734 WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_ABORT);
735 ret = -EIO;
736 goto done;
737 }
738 }
739 for (j = 0; j < current_count; j++)
740 p->buf[buffer_offset + j] = RREG32(AVIVO_DC_I2C_DATA) & 0xff;
741 remaining -= current_count;
742 buffer_offset += current_count;
743 }
744 } else {
745 while (remaining) {
746 if (remaining > 15)
747 current_count = 15;
748 else
749 current_count = remaining;
750 WREG32(AVIVO_DC_I2C_STATUS1, (AVIVO_DC_I2C_DONE |
751 AVIVO_DC_I2C_NACK |
752 AVIVO_DC_I2C_HALT));
753 WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_SOFT_RESET);
754 udelay(1);
755 WREG32(AVIVO_DC_I2C_RESET, 0);
756
757 WREG32(AVIVO_DC_I2C_DATA, (p->addr << 1) & 0xff);
758 for (j = 0; j < current_count; j++)
759 WREG32(AVIVO_DC_I2C_DATA, p->buf[buffer_offset + j]);
760
761 WREG32(AVIVO_DC_I2C_CONTROL3, AVIVO_DC_I2C_TIME_LIMIT(48));
762 WREG32(AVIVO_DC_I2C_CONTROL2, (AVIVO_DC_I2C_ADDR_COUNT(1) |
763 AVIVO_DC_I2C_DATA_COUNT(current_count) |
764 (prescale << 16)));
765 WREG32(AVIVO_DC_I2C_CONTROL1, reg);
766 WREG32(AVIVO_DC_I2C_STATUS1, AVIVO_DC_I2C_GO);
767 for (j = 0; j < 200; j++) {
768 udelay(50);
769 tmp = RREG32(AVIVO_DC_I2C_STATUS1);
770 if (tmp & AVIVO_DC_I2C_GO)
771 continue;
772 tmp = RREG32(AVIVO_DC_I2C_STATUS1);
773 if (tmp & AVIVO_DC_I2C_DONE)
774 break;
775 else {
776 DRM_DEBUG("i2c write error 0x%08x\n", tmp);
777 WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_ABORT);
778 ret = -EIO;
779 goto done;
780 }
781 }
782 remaining -= current_count;
783 buffer_offset += current_count;
784 }
785 }
786 }
787
788 done:
789 WREG32(AVIVO_DC_I2C_STATUS1, (AVIVO_DC_I2C_DONE |
790 AVIVO_DC_I2C_NACK |
791 AVIVO_DC_I2C_HALT));
792 WREG32(AVIVO_DC_I2C_RESET, AVIVO_DC_I2C_SOFT_RESET);
793 udelay(1);
794 WREG32(AVIVO_DC_I2C_RESET, 0);
795
796 WREG32(AVIVO_DC_I2C_ARBITRATION, AVIVO_DC_I2C_SW_DONE_USING_I2C);
797 WREG32(AVIVO_DC_I2C_CONTROL1, saved1);
798 WREG32(0x494, saved2);
799 tmp = RREG32(RADEON_BIOS_6_SCRATCH);
800 tmp &= ~ATOM_S6_HW_I2C_BUSY_STATE;
801 WREG32(RADEON_BIOS_6_SCRATCH, tmp);
802
803 mutex_unlock(&rdev->pm.mutex);
804 mutex_unlock(&rdev->dc_hw_i2c_mutex);
805
806 return ret;
807 }
808
809 static int radeon_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
810 struct i2c_msg *msgs, int num)
811 {
812 struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
813 struct radeon_device *rdev = i2c->dev->dev_private;
814 struct radeon_i2c_bus_rec *rec = &i2c->rec;
815 int ret = 0;
816
817 switch (rdev->family) {
818 case CHIP_R100:
819 case CHIP_RV100:
820 case CHIP_RS100:
821 case CHIP_RV200:
822 case CHIP_RS200:
823 case CHIP_R200:
824 case CHIP_RV250:
825 case CHIP_RS300:
826 case CHIP_RV280:
827 case CHIP_R300:
828 case CHIP_R350:
829 case CHIP_RV350:
830 case CHIP_RV380:
831 case CHIP_R420:
832 case CHIP_R423:
833 case CHIP_RV410:
834 case CHIP_RS400:
835 case CHIP_RS480:
836 ret = r100_hw_i2c_xfer(i2c_adap, msgs, num);
837 break;
838 case CHIP_RS600:
839 case CHIP_RS690:
840 case CHIP_RS740:
841 /* XXX fill in hw i2c implementation */
842 break;
843 case CHIP_RV515:
844 case CHIP_R520:
845 case CHIP_RV530:
846 case CHIP_RV560:
847 case CHIP_RV570:
848 case CHIP_R580:
849 if (rec->mm_i2c)
850 ret = r100_hw_i2c_xfer(i2c_adap, msgs, num);
851 else
852 ret = r500_hw_i2c_xfer(i2c_adap, msgs, num);
853 break;
854 case CHIP_R600:
855 case CHIP_RV610:
856 case CHIP_RV630:
857 case CHIP_RV670:
858 /* XXX fill in hw i2c implementation */
859 break;
860 case CHIP_RV620:
861 case CHIP_RV635:
862 case CHIP_RS780:
863 case CHIP_RS880:
864 case CHIP_RV770:
865 case CHIP_RV730:
866 case CHIP_RV710:
867 case CHIP_RV740:
868 /* XXX fill in hw i2c implementation */
869 break;
870 case CHIP_CEDAR:
871 case CHIP_REDWOOD:
872 case CHIP_JUNIPER:
873 case CHIP_CYPRESS:
874 case CHIP_HEMLOCK:
875 /* XXX fill in hw i2c implementation */
876 break;
877 default:
878 DRM_ERROR("i2c: unhandled radeon chip\n");
879 ret = -EIO;
880 break;
881 }
882
883 return ret;
884 }
885
886 static u32 radeon_hw_i2c_func(struct i2c_adapter *adap)
887 {
888 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
889 }
890
891 static const struct i2c_algorithm radeon_i2c_algo = {
892 .master_xfer = radeon_hw_i2c_xfer,
893 .functionality = radeon_hw_i2c_func,
894 };
895
896 static const struct i2c_algorithm radeon_atom_i2c_algo = {
897 .master_xfer = radeon_atom_hw_i2c_xfer,
898 .functionality = radeon_atom_hw_i2c_func,
899 };
900
901 struct radeon_i2c_chan *radeon_i2c_create(struct drm_device *dev,
902 struct radeon_i2c_bus_rec *rec,
903 const char *name)
904 {
905 struct radeon_device *rdev = dev->dev_private;
906 struct radeon_i2c_chan *i2c;
907 int ret;
908
909 /* don't add the mm_i2c bus unless hw_i2c is enabled */
910 if (rec->mm_i2c && (radeon_hw_i2c == 0))
911 return NULL;
912
913 i2c = kzalloc(sizeof(struct radeon_i2c_chan), GFP_KERNEL);
914 if (i2c == NULL)
915 return NULL;
916
917 i2c->rec = *rec;
918 i2c->adapter.owner = THIS_MODULE;
919 i2c->adapter.class = I2C_CLASS_DDC;
920 i2c->adapter.dev.parent = &dev->pdev->dev;
921 i2c->dev = dev;
922 i2c_set_adapdata(&i2c->adapter, i2c);
923 if (rec->mm_i2c ||
924 (rec->hw_capable &&
925 radeon_hw_i2c &&
926 ((rdev->family <= CHIP_RS480) ||
927 ((rdev->family >= CHIP_RV515) && (rdev->family <= CHIP_R580))))) {
928 /* set the radeon hw i2c adapter */
929 snprintf(i2c->adapter.name, sizeof(i2c->adapter.name),
930 "Radeon i2c hw bus %s", name);
931 i2c->adapter.algo = &radeon_i2c_algo;
932 ret = i2c_add_adapter(&i2c->adapter);
933 if (ret) {
934 DRM_ERROR("Failed to register hw i2c %s\n", name);
935 goto out_free;
936 }
937 } else if (rec->hw_capable &&
938 radeon_hw_i2c &&
939 ASIC_IS_DCE3(rdev)) {
940 /* hw i2c using atom */
941 snprintf(i2c->adapter.name, sizeof(i2c->adapter.name),
942 "Radeon i2c hw bus %s", name);
943 i2c->adapter.algo = &radeon_atom_i2c_algo;
944 ret = i2c_add_adapter(&i2c->adapter);
945 if (ret) {
946 DRM_ERROR("Failed to register hw i2c %s\n", name);
947 goto out_free;
948 }
949 } else {
950 /* set the radeon bit adapter */
951 snprintf(i2c->adapter.name, sizeof(i2c->adapter.name),
952 "Radeon i2c bit bus %s", name);
953 i2c->adapter.algo_data = &i2c->algo.bit;
954 i2c->algo.bit.pre_xfer = pre_xfer;
955 i2c->algo.bit.post_xfer = post_xfer;
956 i2c->algo.bit.setsda = set_data;
957 i2c->algo.bit.setscl = set_clock;
958 i2c->algo.bit.getsda = get_data;
959 i2c->algo.bit.getscl = get_clock;
960 i2c->algo.bit.udelay = 10;
961 i2c->algo.bit.timeout = usecs_to_jiffies(2200); /* from VESA */
962 i2c->algo.bit.data = i2c;
963 ret = i2c_bit_add_bus(&i2c->adapter);
964 if (ret) {
965 DRM_ERROR("Failed to register bit i2c %s\n", name);
966 goto out_free;
967 }
968 }
969
970 return i2c;
971 out_free:
972 kfree(i2c);
973 return NULL;
974
975 }
976
977 struct radeon_i2c_chan *radeon_i2c_create_dp(struct drm_device *dev,
978 struct radeon_i2c_bus_rec *rec,
979 const char *name)
980 {
981 struct radeon_i2c_chan *i2c;
982 int ret;
983
984 i2c = kzalloc(sizeof(struct radeon_i2c_chan), GFP_KERNEL);
985 if (i2c == NULL)
986 return NULL;
987
988 i2c->rec = *rec;
989 i2c->adapter.owner = THIS_MODULE;
990 i2c->adapter.class = I2C_CLASS_DDC;
991 i2c->adapter.dev.parent = &dev->pdev->dev;
992 i2c->dev = dev;
993 snprintf(i2c->adapter.name, sizeof(i2c->adapter.name),
994 "Radeon aux bus %s", name);
995 i2c_set_adapdata(&i2c->adapter, i2c);
996 i2c->adapter.algo_data = &i2c->algo.dp;
997 i2c->algo.dp.aux_ch = radeon_dp_i2c_aux_ch;
998 i2c->algo.dp.address = 0;
999 ret = i2c_dp_aux_add_bus(&i2c->adapter);
1000 if (ret) {
1001 DRM_INFO("Failed to register i2c %s\n", name);
1002 goto out_free;
1003 }
1004
1005 return i2c;
1006 out_free:
1007 kfree(i2c);
1008 return NULL;
1009
1010 }
1011
1012 void radeon_i2c_destroy(struct radeon_i2c_chan *i2c)
1013 {
1014 if (!i2c)
1015 return;
1016 i2c_del_adapter(&i2c->adapter);
1017 kfree(i2c);
1018 }
1019
1020 /* Add the default buses */
1021 void radeon_i2c_init(struct radeon_device *rdev)
1022 {
1023 if (rdev->is_atom_bios)
1024 radeon_atombios_i2c_init(rdev);
1025 else
1026 radeon_combios_i2c_init(rdev);
1027 }
1028
1029 /* remove all the buses */
1030 void radeon_i2c_fini(struct radeon_device *rdev)
1031 {
1032 int i;
1033
1034 for (i = 0; i < RADEON_MAX_I2C_BUS; i++) {
1035 if (rdev->i2c_bus[i]) {
1036 radeon_i2c_destroy(rdev->i2c_bus[i]);
1037 rdev->i2c_bus[i] = NULL;
1038 }
1039 }
1040 }
1041
1042 /* Add additional buses */
1043 void radeon_i2c_add(struct radeon_device *rdev,
1044 struct radeon_i2c_bus_rec *rec,
1045 const char *name)
1046 {
1047 struct drm_device *dev = rdev->ddev;
1048 int i;
1049
1050 for (i = 0; i < RADEON_MAX_I2C_BUS; i++) {
1051 if (!rdev->i2c_bus[i]) {
1052 rdev->i2c_bus[i] = radeon_i2c_create(dev, rec, name);
1053 return;
1054 }
1055 }
1056 }
1057
1058 /* looks up bus based on id */
1059 struct radeon_i2c_chan *radeon_i2c_lookup(struct radeon_device *rdev,
1060 struct radeon_i2c_bus_rec *i2c_bus)
1061 {
1062 int i;
1063
1064 for (i = 0; i < RADEON_MAX_I2C_BUS; i++) {
1065 if (rdev->i2c_bus[i] &&
1066 (rdev->i2c_bus[i]->rec.i2c_id == i2c_bus->i2c_id)) {
1067 return rdev->i2c_bus[i];
1068 }
1069 }
1070 return NULL;
1071 }
1072
1073 struct drm_encoder *radeon_best_encoder(struct drm_connector *connector)
1074 {
1075 return NULL;
1076 }
1077
1078 void radeon_i2c_get_byte(struct radeon_i2c_chan *i2c_bus,
1079 u8 slave_addr,
1080 u8 addr,
1081 u8 *val)
1082 {
1083 u8 out_buf[2];
1084 u8 in_buf[2];
1085 struct i2c_msg msgs[] = {
1086 {
1087 .addr = slave_addr,
1088 .flags = 0,
1089 .len = 1,
1090 .buf = out_buf,
1091 },
1092 {
1093 .addr = slave_addr,
1094 .flags = I2C_M_RD,
1095 .len = 1,
1096 .buf = in_buf,
1097 }
1098 };
1099
1100 out_buf[0] = addr;
1101 out_buf[1] = 0;
1102
1103 if (i2c_transfer(&i2c_bus->adapter, msgs, 2) == 2) {
1104 *val = in_buf[0];
1105 DRM_DEBUG("val = 0x%02x\n", *val);
1106 } else {
1107 DRM_DEBUG("i2c 0x%02x 0x%02x read failed\n",
1108 addr, *val);
1109 }
1110 }
1111
1112 void radeon_i2c_put_byte(struct radeon_i2c_chan *i2c_bus,
1113 u8 slave_addr,
1114 u8 addr,
1115 u8 val)
1116 {
1117 uint8_t out_buf[2];
1118 struct i2c_msg msg = {
1119 .addr = slave_addr,
1120 .flags = 0,
1121 .len = 2,
1122 .buf = out_buf,
1123 };
1124
1125 out_buf[0] = addr;
1126 out_buf[1] = val;
1127
1128 if (i2c_transfer(&i2c_bus->adapter, &msg, 1) != 1)
1129 DRM_DEBUG("i2c 0x%02x 0x%02x write failed\n",
1130 addr, val);
1131 }
1132
1133 /* ddc router switching */
1134 void radeon_router_select_ddc_port(struct radeon_connector *radeon_connector)
1135 {
1136 u8 val;
1137
1138 if (!radeon_connector->router.ddc_valid)
1139 return;
1140
1141 if (!radeon_connector->router_bus)
1142 return;
1143
1144 radeon_i2c_get_byte(radeon_connector->router_bus,
1145 radeon_connector->router.i2c_addr,
1146 0x3, &val);
1147 val &= ~radeon_connector->router.ddc_mux_control_pin;
1148 radeon_i2c_put_byte(radeon_connector->router_bus,
1149 radeon_connector->router.i2c_addr,
1150 0x3, val);
1151 radeon_i2c_get_byte(radeon_connector->router_bus,
1152 radeon_connector->router.i2c_addr,
1153 0x1, &val);
1154 val &= ~radeon_connector->router.ddc_mux_control_pin;
1155 val |= radeon_connector->router.ddc_mux_state;
1156 radeon_i2c_put_byte(radeon_connector->router_bus,
1157 radeon_connector->router.i2c_addr,
1158 0x1, val);
1159 }
1160
1161 /* clock/data router switching */
1162 void radeon_router_select_cd_port(struct radeon_connector *radeon_connector)
1163 {
1164 u8 val;
1165
1166 if (!radeon_connector->router.cd_valid)
1167 return;
1168
1169 if (!radeon_connector->router_bus)
1170 return;
1171
1172 radeon_i2c_get_byte(radeon_connector->router_bus,
1173 radeon_connector->router.i2c_addr,
1174 0x3, &val);
1175 val &= ~radeon_connector->router.cd_mux_control_pin;
1176 radeon_i2c_put_byte(radeon_connector->router_bus,
1177 radeon_connector->router.i2c_addr,
1178 0x3, val);
1179 radeon_i2c_get_byte(radeon_connector->router_bus,
1180 radeon_connector->router.i2c_addr,
1181 0x1, &val);
1182 val &= ~radeon_connector->router.cd_mux_control_pin;
1183 val |= radeon_connector->router.cd_mux_state;
1184 radeon_i2c_put_byte(radeon_connector->router_bus,
1185 radeon_connector->router.i2c_addr,
1186 0x1, val);
1187 }
1188
kernel source for telekom puls (alcatel/mediatek)