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