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block: move down direct IO plugging
[linux/fpc-iii.git] / drivers / video / mxsfb.c
blob49619b4415000efc1ef87756d09667017a682244
1 /*
2 * Copyright (C) 2010 Juergen Beisert, Pengutronix
3 *
4 * This code is based on:
5 * Author: Vitaly Wool <vital@embeddedalley.com>
6 *
7 * Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
8 * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version 2
13 * of the License, or (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 */
19
20 #define DRIVER_NAME "mxsfb"
21
22 /**
23 * @file
24 * @brief LCDIF driver for i.MX23 and i.MX28
25 *
26 * The LCDIF support four modes of operation
27 * - MPU interface (to drive smart displays) -> not supported yet
28 * - VSYNC interface (like MPU interface plus Vsync) -> not supported yet
29 * - Dotclock interface (to drive LC displays with RGB data and sync signals)
30 * - DVI (to drive ITU-R BT656) -> not supported yet
31 *
32 * This driver depends on a correct setup of the pins used for this purpose
33 * (platform specific).
34 *
35 * For the developer: Don't forget to set the data bus width to the display
36 * in the imx_fb_videomode structure. You will else end up with ugly colours.
37 * If you fight against jitter you can vary the clock delay. This is a feature
38 * of the i.MX28 and you can vary it between 2 ns ... 8 ns in 2 ns steps. Give
39 * the required value in the imx_fb_videomode structure.
40 */
41
42 #include <linux/module.h>
43 #include <linux/kernel.h>
44 #include <linux/of_device.h>
45 #include <linux/of_gpio.h>
46 #include <linux/platform_device.h>
47 #include <linux/clk.h>
48 #include <linux/dma-mapping.h>
49 #include <linux/io.h>
50 #include <linux/pinctrl/consumer.h>
51 #include <linux/mxsfb.h>
52
53 #define REG_SET 4
54 #define REG_CLR 8
55
56 #define LCDC_CTRL 0x00
57 #define LCDC_CTRL1 0x10
58 #define LCDC_V4_CTRL2 0x20
59 #define LCDC_V3_TRANSFER_COUNT 0x20
60 #define LCDC_V4_TRANSFER_COUNT 0x30
61 #define LCDC_V4_CUR_BUF 0x40
62 #define LCDC_V4_NEXT_BUF 0x50
63 #define LCDC_V3_CUR_BUF 0x30
64 #define LCDC_V3_NEXT_BUF 0x40
65 #define LCDC_TIMING 0x60
66 #define LCDC_VDCTRL0 0x70
67 #define LCDC_VDCTRL1 0x80
68 #define LCDC_VDCTRL2 0x90
69 #define LCDC_VDCTRL3 0xa0
70 #define LCDC_VDCTRL4 0xb0
71 #define LCDC_DVICTRL0 0xc0
72 #define LCDC_DVICTRL1 0xd0
73 #define LCDC_DVICTRL2 0xe0
74 #define LCDC_DVICTRL3 0xf0
75 #define LCDC_DVICTRL4 0x100
76 #define LCDC_V4_DATA 0x180
77 #define LCDC_V3_DATA 0x1b0
78 #define LCDC_V4_DEBUG0 0x1d0
79 #define LCDC_V3_DEBUG0 0x1f0
80
81 #define CTRL_SFTRST (1 << 31)
82 #define CTRL_CLKGATE (1 << 30)
83 #define CTRL_BYPASS_COUNT (1 << 19)
84 #define CTRL_VSYNC_MODE (1 << 18)
85 #define CTRL_DOTCLK_MODE (1 << 17)
86 #define CTRL_DATA_SELECT (1 << 16)
87 #define CTRL_SET_BUS_WIDTH(x) (((x) & 0x3) << 10)
88 #define CTRL_GET_BUS_WIDTH(x) (((x) >> 10) & 0x3)
89 #define CTRL_SET_WORD_LENGTH(x) (((x) & 0x3) << 8)
90 #define CTRL_GET_WORD_LENGTH(x) (((x) >> 8) & 0x3)
91 #define CTRL_MASTER (1 << 5)
92 #define CTRL_DF16 (1 << 3)
93 #define CTRL_DF18 (1 << 2)
94 #define CTRL_DF24 (1 << 1)
95 #define CTRL_RUN (1 << 0)
96
97 #define CTRL1_FIFO_CLEAR (1 << 21)
98 #define CTRL1_SET_BYTE_PACKAGING(x) (((x) & 0xf) << 16)
99 #define CTRL1_GET_BYTE_PACKAGING(x) (((x) >> 16) & 0xf)
100
101 #define TRANSFER_COUNT_SET_VCOUNT(x) (((x) & 0xffff) << 16)
102 #define TRANSFER_COUNT_GET_VCOUNT(x) (((x) >> 16) & 0xffff)
103 #define TRANSFER_COUNT_SET_HCOUNT(x) ((x) & 0xffff)
104 #define TRANSFER_COUNT_GET_HCOUNT(x) ((x) & 0xffff)
105
106
107 #define VDCTRL0_ENABLE_PRESENT (1 << 28)
108 #define VDCTRL0_VSYNC_ACT_HIGH (1 << 27)
109 #define VDCTRL0_HSYNC_ACT_HIGH (1 << 26)
110 #define VDCTRL0_DOTCLK_ACT_FAILING (1 << 25)
111 #define VDCTRL0_ENABLE_ACT_HIGH (1 << 24)
112 #define VDCTRL0_VSYNC_PERIOD_UNIT (1 << 21)
113 #define VDCTRL0_VSYNC_PULSE_WIDTH_UNIT (1 << 20)
114 #define VDCTRL0_HALF_LINE (1 << 19)
115 #define VDCTRL0_HALF_LINE_MODE (1 << 18)
116 #define VDCTRL0_SET_VSYNC_PULSE_WIDTH(x) ((x) & 0x3ffff)
117 #define VDCTRL0_GET_VSYNC_PULSE_WIDTH(x) ((x) & 0x3ffff)
118
119 #define VDCTRL2_SET_HSYNC_PERIOD(x) ((x) & 0x3ffff)
120 #define VDCTRL2_GET_HSYNC_PERIOD(x) ((x) & 0x3ffff)
121
122 #define VDCTRL3_MUX_SYNC_SIGNALS (1 << 29)
123 #define VDCTRL3_VSYNC_ONLY (1 << 28)
124 #define SET_HOR_WAIT_CNT(x) (((x) & 0xfff) << 16)
125 #define GET_HOR_WAIT_CNT(x) (((x) >> 16) & 0xfff)
126 #define SET_VERT_WAIT_CNT(x) ((x) & 0xffff)
127 #define GET_VERT_WAIT_CNT(x) ((x) & 0xffff)
128
129 #define VDCTRL4_SET_DOTCLK_DLY(x) (((x) & 0x7) << 29) /* v4 only */
130 #define VDCTRL4_GET_DOTCLK_DLY(x) (((x) >> 29) & 0x7) /* v4 only */
131 #define VDCTRL4_SYNC_SIGNALS_ON (1 << 18)
132 #define SET_DOTCLK_H_VALID_DATA_CNT(x) ((x) & 0x3ffff)
133
134 #define DEBUG0_HSYNC (1 < 26)
135 #define DEBUG0_VSYNC (1 < 25)
136
137 #define MIN_XRES 120
138 #define MIN_YRES 120
139
140 #define RED 0
141 #define GREEN 1
142 #define BLUE 2
143 #define TRANSP 3
144
145 enum mxsfb_devtype {
146 MXSFB_V3,
147 MXSFB_V4,
148 };
149
150 /* CPU dependent register offsets */
151 struct mxsfb_devdata {
152 unsigned transfer_count;
153 unsigned cur_buf;
154 unsigned next_buf;
155 unsigned debug0;
156 unsigned hs_wdth_mask;
157 unsigned hs_wdth_shift;
158 unsigned ipversion;
159 };
160
161 struct mxsfb_info {
162 struct fb_info fb_info;
163 struct platform_device *pdev;
164 struct clk *clk;
165 void __iomem *base; /* registers */
166 unsigned allocated_size;
167 int enabled;
168 unsigned ld_intf_width;
169 unsigned dotclk_delay;
170 const struct mxsfb_devdata *devdata;
171 int mapped;
172 };
173
174 #define mxsfb_is_v3(host) (host->devdata->ipversion == 3)
175 #define mxsfb_is_v4(host) (host->devdata->ipversion == 4)
176
177 static const struct mxsfb_devdata mxsfb_devdata[] = {
178 [MXSFB_V3] = {
179 .transfer_count = LCDC_V3_TRANSFER_COUNT,
180 .cur_buf = LCDC_V3_CUR_BUF,
181 .next_buf = LCDC_V3_NEXT_BUF,
182 .debug0 = LCDC_V3_DEBUG0,
183 .hs_wdth_mask = 0xff,
184 .hs_wdth_shift = 24,
185 .ipversion = 3,
186 },
187 [MXSFB_V4] = {
188 .transfer_count = LCDC_V4_TRANSFER_COUNT,
189 .cur_buf = LCDC_V4_CUR_BUF,
190 .next_buf = LCDC_V4_NEXT_BUF,
191 .debug0 = LCDC_V4_DEBUG0,
192 .hs_wdth_mask = 0x3fff,
193 .hs_wdth_shift = 18,
194 .ipversion = 4,
195 },
196 };
197
198 #define to_imxfb_host(x) (container_of(x, struct mxsfb_info, fb_info))
199
200 /* mask and shift depends on architecture */
201 static inline u32 set_hsync_pulse_width(struct mxsfb_info *host, unsigned val)
202 {
203 return (val & host->devdata->hs_wdth_mask) <<
204 host->devdata->hs_wdth_shift;
205 }
206
207 static inline u32 get_hsync_pulse_width(struct mxsfb_info *host, unsigned val)
208 {
209 return (val >> host->devdata->hs_wdth_shift) &
210 host->devdata->hs_wdth_mask;
211 }
212
213 static const struct fb_bitfield def_rgb565[] = {
214 [RED] = {
215 .offset = 11,
216 .length = 5,
217 },
218 [GREEN] = {
219 .offset = 5,
220 .length = 6,
221 },
222 [BLUE] = {
223 .offset = 0,
224 .length = 5,
225 },
226 [TRANSP] = { /* no support for transparency */
227 .length = 0,
228 }
229 };
230
231 static const struct fb_bitfield def_rgb666[] = {
232 [RED] = {
233 .offset = 16,
234 .length = 6,
235 },
236 [GREEN] = {
237 .offset = 8,
238 .length = 6,
239 },
240 [BLUE] = {
241 .offset = 0,
242 .length = 6,
243 },
244 [TRANSP] = { /* no support for transparency */
245 .length = 0,
246 }
247 };
248
249 static const struct fb_bitfield def_rgb888[] = {
250 [RED] = {
251 .offset = 16,
252 .length = 8,
253 },
254 [GREEN] = {
255 .offset = 8,
256 .length = 8,
257 },
258 [BLUE] = {
259 .offset = 0,
260 .length = 8,
261 },
262 [TRANSP] = { /* no support for transparency */
263 .length = 0,
264 }
265 };
266
267 static inline unsigned chan_to_field(unsigned chan, struct fb_bitfield *bf)
268 {
269 chan &= 0xffff;
270 chan >>= 16 - bf->length;
271 return chan << bf->offset;
272 }
273
274 static int mxsfb_check_var(struct fb_var_screeninfo *var,
275 struct fb_info *fb_info)
276 {
277 struct mxsfb_info *host = to_imxfb_host(fb_info);
278 const struct fb_bitfield *rgb = NULL;
279
280 if (var->xres < MIN_XRES)
281 var->xres = MIN_XRES;
282 if (var->yres < MIN_YRES)
283 var->yres = MIN_YRES;
284
285 var->xres_virtual = var->xres;
286
287 var->yres_virtual = var->yres;
288
289 switch (var->bits_per_pixel) {
290 case 16:
291 /* always expect RGB 565 */
292 rgb = def_rgb565;
293 break;
294 case 32:
295 switch (host->ld_intf_width) {
296 case STMLCDIF_8BIT:
297 pr_debug("Unsupported LCD bus width mapping\n");
298 break;
299 case STMLCDIF_16BIT:
300 case STMLCDIF_18BIT:
301 /* 24 bit to 18 bit mapping */
302 rgb = def_rgb666;
303 break;
304 case STMLCDIF_24BIT:
305 /* real 24 bit */
306 rgb = def_rgb888;
307 break;
308 }
309 break;
310 default:
311 pr_debug("Unsupported colour depth: %u\n", var->bits_per_pixel);
312 return -EINVAL;
313 }
314
315 /*
316 * Copy the RGB parameters for this display
317 * from the machine specific parameters.
318 */
319 var->red = rgb[RED];
320 var->green = rgb[GREEN];
321 var->blue = rgb[BLUE];
322 var->transp = rgb[TRANSP];
323
324 return 0;
325 }
326
327 static void mxsfb_enable_controller(struct fb_info *fb_info)
328 {
329 struct mxsfb_info *host = to_imxfb_host(fb_info);
330 u32 reg;
331
332 dev_dbg(&host->pdev->dev, "%s\n", __func__);
333
334 clk_prepare_enable(host->clk);
335 clk_set_rate(host->clk, PICOS2KHZ(fb_info->var.pixclock) * 1000U);
336
337 /* if it was disabled, re-enable the mode again */
338 writel(CTRL_DOTCLK_MODE, host->base + LCDC_CTRL + REG_SET);
339
340 /* enable the SYNC signals first, then the DMA engine */
341 reg = readl(host->base + LCDC_VDCTRL4);
342 reg |= VDCTRL4_SYNC_SIGNALS_ON;
343 writel(reg, host->base + LCDC_VDCTRL4);
344
345 writel(CTRL_RUN, host->base + LCDC_CTRL + REG_SET);
346
347 host->enabled = 1;
348 }
349
350 static void mxsfb_disable_controller(struct fb_info *fb_info)
351 {
352 struct mxsfb_info *host = to_imxfb_host(fb_info);
353 unsigned loop;
354 u32 reg;
355
356 dev_dbg(&host->pdev->dev, "%s\n", __func__);
357
358 /*
359 * Even if we disable the controller here, it will still continue
360 * until its FIFOs are running out of data
361 */
362 writel(CTRL_DOTCLK_MODE, host->base + LCDC_CTRL + REG_CLR);
363
364 loop = 1000;
365 while (loop) {
366 reg = readl(host->base + LCDC_CTRL);
367 if (!(reg & CTRL_RUN))
368 break;
369 loop--;
370 }
371
372 writel(VDCTRL4_SYNC_SIGNALS_ON, host->base + LCDC_VDCTRL4 + REG_CLR);
373
374 clk_disable_unprepare(host->clk);
375
376 host->enabled = 0;
377 }
378
379 static int mxsfb_set_par(struct fb_info *fb_info)
380 {
381 struct mxsfb_info *host = to_imxfb_host(fb_info);
382 u32 ctrl, vdctrl0, vdctrl4;
383 int line_size, fb_size;
384 int reenable = 0;
385
386 line_size = fb_info->var.xres * (fb_info->var.bits_per_pixel >> 3);
387 fb_size = fb_info->var.yres_virtual * line_size;
388
389 if (fb_size > fb_info->fix.smem_len)
390 return -ENOMEM;
391
392 fb_info->fix.line_length = line_size;
393
394 /*
395 * It seems, you can't re-program the controller if it is still running.
396 * This may lead into shifted pictures (FIFO issue?).
397 * So, first stop the controller and drain its FIFOs
398 */
399 if (host->enabled) {
400 reenable = 1;
401 mxsfb_disable_controller(fb_info);
402 }
403
404 /* clear the FIFOs */
405 writel(CTRL1_FIFO_CLEAR, host->base + LCDC_CTRL1 + REG_SET);
406
407 ctrl = CTRL_BYPASS_COUNT | CTRL_MASTER |
408 CTRL_SET_BUS_WIDTH(host->ld_intf_width);
409
410 switch (fb_info->var.bits_per_pixel) {
411 case 16:
412 dev_dbg(&host->pdev->dev, "Setting up RGB565 mode\n");
413 ctrl |= CTRL_SET_WORD_LENGTH(0);
414 writel(CTRL1_SET_BYTE_PACKAGING(0xf), host->base + LCDC_CTRL1);
415 break;
416 case 32:
417 dev_dbg(&host->pdev->dev, "Setting up RGB888/666 mode\n");
418 ctrl |= CTRL_SET_WORD_LENGTH(3);
419 switch (host->ld_intf_width) {
420 case STMLCDIF_8BIT:
421 dev_dbg(&host->pdev->dev,
422 "Unsupported LCD bus width mapping\n");
423 return -EINVAL;
424 case STMLCDIF_16BIT:
425 case STMLCDIF_18BIT:
426 /* 24 bit to 18 bit mapping */
427 ctrl |= CTRL_DF24; /* ignore the upper 2 bits in
428 * each colour component
429 */
430 break;
431 case STMLCDIF_24BIT:
432 /* real 24 bit */
433 break;
434 }
435 /* do not use packed pixels = one pixel per word instead */
436 writel(CTRL1_SET_BYTE_PACKAGING(0x7), host->base + LCDC_CTRL1);
437 break;
438 default:
439 dev_dbg(&host->pdev->dev, "Unhandled color depth of %u\n",
440 fb_info->var.bits_per_pixel);
441 return -EINVAL;
442 }
443
444 writel(ctrl, host->base + LCDC_CTRL);
445
446 writel(TRANSFER_COUNT_SET_VCOUNT(fb_info->var.yres) |
447 TRANSFER_COUNT_SET_HCOUNT(fb_info->var.xres),
448 host->base + host->devdata->transfer_count);
449
450 vdctrl0 = VDCTRL0_ENABLE_PRESENT | /* always in DOTCLOCK mode */
451 VDCTRL0_VSYNC_PERIOD_UNIT |
452 VDCTRL0_VSYNC_PULSE_WIDTH_UNIT |
453 VDCTRL0_SET_VSYNC_PULSE_WIDTH(fb_info->var.vsync_len);
454 if (fb_info->var.sync & FB_SYNC_HOR_HIGH_ACT)
455 vdctrl0 |= VDCTRL0_HSYNC_ACT_HIGH;
456 if (fb_info->var.sync & FB_SYNC_VERT_HIGH_ACT)
457 vdctrl0 |= VDCTRL0_VSYNC_ACT_HIGH;
458 if (fb_info->var.sync & FB_SYNC_DATA_ENABLE_HIGH_ACT)
459 vdctrl0 |= VDCTRL0_ENABLE_ACT_HIGH;
460 if (fb_info->var.sync & FB_SYNC_DOTCLK_FAILING_ACT)
461 vdctrl0 |= VDCTRL0_DOTCLK_ACT_FAILING;
462
463 writel(vdctrl0, host->base + LCDC_VDCTRL0);
464
465 /* frame length in lines */
466 writel(fb_info->var.upper_margin + fb_info->var.vsync_len +
467 fb_info->var.lower_margin + fb_info->var.yres,
468 host->base + LCDC_VDCTRL1);
469
470 /* line length in units of clocks or pixels */
471 writel(set_hsync_pulse_width(host, fb_info->var.hsync_len) |
472 VDCTRL2_SET_HSYNC_PERIOD(fb_info->var.left_margin +
473 fb_info->var.hsync_len + fb_info->var.right_margin +
474 fb_info->var.xres),
475 host->base + LCDC_VDCTRL2);
476
477 writel(SET_HOR_WAIT_CNT(fb_info->var.left_margin +
478 fb_info->var.hsync_len) |
479 SET_VERT_WAIT_CNT(fb_info->var.upper_margin +
480 fb_info->var.vsync_len),
481 host->base + LCDC_VDCTRL3);
482
483 vdctrl4 = SET_DOTCLK_H_VALID_DATA_CNT(fb_info->var.xres);
484 if (mxsfb_is_v4(host))
485 vdctrl4 |= VDCTRL4_SET_DOTCLK_DLY(host->dotclk_delay);
486 writel(vdctrl4, host->base + LCDC_VDCTRL4);
487
488 writel(fb_info->fix.smem_start +
489 fb_info->fix.line_length * fb_info->var.yoffset,
490 host->base + host->devdata->next_buf);
491
492 if (reenable)
493 mxsfb_enable_controller(fb_info);
494
495 return 0;
496 }
497
498 static int mxsfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
499 u_int transp, struct fb_info *fb_info)
500 {
501 unsigned int val;
502 int ret = -EINVAL;
503
504 /*
505 * If greyscale is true, then we convert the RGB value
506 * to greyscale no matter what visual we are using.
507 */
508 if (fb_info->var.grayscale)
509 red = green = blue = (19595 * red + 38470 * green +
510 7471 * blue) >> 16;
511
512 switch (fb_info->fix.visual) {
513 case FB_VISUAL_TRUECOLOR:
514 /*
515 * 12 or 16-bit True Colour. We encode the RGB value
516 * according to the RGB bitfield information.
517 */
518 if (regno < 16) {
519 u32 *pal = fb_info->pseudo_palette;
520
521 val = chan_to_field(red, &fb_info->var.red);
522 val |= chan_to_field(green, &fb_info->var.green);
523 val |= chan_to_field(blue, &fb_info->var.blue);
524
525 pal[regno] = val;
526 ret = 0;
527 }
528 break;
529
530 case FB_VISUAL_STATIC_PSEUDOCOLOR:
531 case FB_VISUAL_PSEUDOCOLOR:
532 break;
533 }
534
535 return ret;
536 }
537
538 static int mxsfb_blank(int blank, struct fb_info *fb_info)
539 {
540 struct mxsfb_info *host = to_imxfb_host(fb_info);
541
542 switch (blank) {
543 case FB_BLANK_POWERDOWN:
544 case FB_BLANK_VSYNC_SUSPEND:
545 case FB_BLANK_HSYNC_SUSPEND:
546 case FB_BLANK_NORMAL:
547 if (host->enabled)
548 mxsfb_disable_controller(fb_info);
549 break;
550
551 case FB_BLANK_UNBLANK:
552 if (!host->enabled)
553 mxsfb_enable_controller(fb_info);
554 break;
555 }
556 return 0;
557 }
558
559 static int mxsfb_pan_display(struct fb_var_screeninfo *var,
560 struct fb_info *fb_info)
561 {
562 struct mxsfb_info *host = to_imxfb_host(fb_info);
563 unsigned offset;
564
565 if (var->xoffset != 0)
566 return -EINVAL;
567
568 offset = fb_info->fix.line_length * var->yoffset;
569
570 /* update on next VSYNC */
571 writel(fb_info->fix.smem_start + offset,
572 host->base + host->devdata->next_buf);
573
574 return 0;
575 }
576
577 static struct fb_ops mxsfb_ops = {
578 .owner = THIS_MODULE,
579 .fb_check_var = mxsfb_check_var,
580 .fb_set_par = mxsfb_set_par,
581 .fb_setcolreg = mxsfb_setcolreg,
582 .fb_blank = mxsfb_blank,
583 .fb_pan_display = mxsfb_pan_display,
584 .fb_fillrect = cfb_fillrect,
585 .fb_copyarea = cfb_copyarea,
586 .fb_imageblit = cfb_imageblit,
587 };
588
589 static int __devinit mxsfb_restore_mode(struct mxsfb_info *host)
590 {
591 struct fb_info *fb_info = &host->fb_info;
592 unsigned line_count;
593 unsigned period;
594 unsigned long pa, fbsize;
595 int bits_per_pixel, ofs;
596 u32 transfer_count, vdctrl0, vdctrl2, vdctrl3, vdctrl4, ctrl;
597 struct fb_videomode vmode;
598
599 /* Only restore the mode when the controller is running */
600 ctrl = readl(host->base + LCDC_CTRL);
601 if (!(ctrl & CTRL_RUN))
602 return -EINVAL;
603
604 vdctrl0 = readl(host->base + LCDC_VDCTRL0);
605 vdctrl2 = readl(host->base + LCDC_VDCTRL2);
606 vdctrl3 = readl(host->base + LCDC_VDCTRL3);
607 vdctrl4 = readl(host->base + LCDC_VDCTRL4);
608
609 transfer_count = readl(host->base + host->devdata->transfer_count);
610
611 vmode.xres = TRANSFER_COUNT_GET_HCOUNT(transfer_count);
612 vmode.yres = TRANSFER_COUNT_GET_VCOUNT(transfer_count);
613
614 switch (CTRL_GET_WORD_LENGTH(ctrl)) {
615 case 0:
616 bits_per_pixel = 16;
617 break;
618 case 3:
619 bits_per_pixel = 32;
620 case 1:
621 default:
622 return -EINVAL;
623 }
624
625 fb_info->var.bits_per_pixel = bits_per_pixel;
626
627 vmode.pixclock = KHZ2PICOS(clk_get_rate(host->clk) / 1000U);
628 vmode.hsync_len = get_hsync_pulse_width(host, vdctrl2);
629 vmode.left_margin = GET_HOR_WAIT_CNT(vdctrl3) - vmode.hsync_len;
630 vmode.right_margin = VDCTRL2_GET_HSYNC_PERIOD(vdctrl2) - vmode.hsync_len -
631 vmode.left_margin - vmode.xres;
632 vmode.vsync_len = VDCTRL0_GET_VSYNC_PULSE_WIDTH(vdctrl0);
633 period = readl(host->base + LCDC_VDCTRL1);
634 vmode.upper_margin = GET_VERT_WAIT_CNT(vdctrl3) - vmode.vsync_len;
635 vmode.lower_margin = period - vmode.vsync_len - vmode.upper_margin - vmode.yres;
636
637 vmode.vmode = FB_VMODE_NONINTERLACED;
638
639 vmode.sync = 0;
640 if (vdctrl0 & VDCTRL0_HSYNC_ACT_HIGH)
641 vmode.sync |= FB_SYNC_HOR_HIGH_ACT;
642 if (vdctrl0 & VDCTRL0_VSYNC_ACT_HIGH)
643 vmode.sync |= FB_SYNC_VERT_HIGH_ACT;
644
645 pr_debug("Reconstructed video mode:\n");
646 pr_debug("%dx%d, hsync: %u left: %u, right: %u, vsync: %u, upper: %u, lower: %u\n",
647 vmode.xres, vmode.yres,
648 vmode.hsync_len, vmode.left_margin, vmode.right_margin,
649 vmode.vsync_len, vmode.upper_margin, vmode.lower_margin);
650 pr_debug("pixclk: %ldkHz\n", PICOS2KHZ(vmode.pixclock));
651
652 fb_add_videomode(&vmode, &fb_info->modelist);
653
654 host->ld_intf_width = CTRL_GET_BUS_WIDTH(ctrl);
655 host->dotclk_delay = VDCTRL4_GET_DOTCLK_DLY(vdctrl4);
656
657 fb_info->fix.line_length = vmode.xres * (bits_per_pixel >> 3);
658
659 pa = readl(host->base + host->devdata->cur_buf);
660 fbsize = fb_info->fix.line_length * vmode.yres;
661 if (pa < fb_info->fix.smem_start)
662 return -EINVAL;
663 if (pa + fbsize > fb_info->fix.smem_start + fb_info->fix.smem_len)
664 return -EINVAL;
665 ofs = pa - fb_info->fix.smem_start;
666 if (ofs) {
667 memmove(fb_info->screen_base, fb_info->screen_base + ofs, fbsize);
668 writel(fb_info->fix.smem_start, host->base + host->devdata->next_buf);
669 }
670
671 line_count = fb_info->fix.smem_len / fb_info->fix.line_length;
672 fb_info->fix.ypanstep = 1;
673
674 clk_prepare_enable(host->clk);
675 host->enabled = 1;
676
677 return 0;
678 }
679
680 static int __devinit mxsfb_init_fbinfo(struct mxsfb_info *host)
681 {
682 struct fb_info *fb_info = &host->fb_info;
683 struct fb_var_screeninfo *var = &fb_info->var;
684 struct mxsfb_platform_data *pdata = host->pdev->dev.platform_data;
685 dma_addr_t fb_phys;
686 void *fb_virt;
687 unsigned fb_size = pdata->fb_size;
688
689 fb_info->fbops = &mxsfb_ops;
690 fb_info->flags = FBINFO_FLAG_DEFAULT | FBINFO_READS_FAST;
691 strlcpy(fb_info->fix.id, "mxs", sizeof(fb_info->fix.id));
692 fb_info->fix.type = FB_TYPE_PACKED_PIXELS;
693 fb_info->fix.ypanstep = 1;
694 fb_info->fix.visual = FB_VISUAL_TRUECOLOR,
695 fb_info->fix.accel = FB_ACCEL_NONE;
696
697 var->bits_per_pixel = pdata->default_bpp ? pdata->default_bpp : 16;
698 var->nonstd = 0;
699 var->activate = FB_ACTIVATE_NOW;
700 var->accel_flags = 0;
701 var->vmode = FB_VMODE_NONINTERLACED;
702
703 host->dotclk_delay = pdata->dotclk_delay;
704 host->ld_intf_width = pdata->ld_intf_width;
705
706 /* Memory allocation for framebuffer */
707 if (pdata->fb_phys) {
708 if (!fb_size)
709 return -EINVAL;
710
711 fb_phys = pdata->fb_phys;
712
713 if (!request_mem_region(fb_phys, fb_size, host->pdev->name))
714 return -ENOMEM;
715
716 fb_virt = ioremap(fb_phys, fb_size);
717 if (!fb_virt) {
718 release_mem_region(fb_phys, fb_size);
719 return -ENOMEM;
720 }
721 host->mapped = 1;
722 } else {
723 if (!fb_size)
724 fb_size = SZ_2M; /* default */
725 fb_virt = alloc_pages_exact(fb_size, GFP_DMA);
726 if (!fb_virt)
727 return -ENOMEM;
728
729 fb_phys = virt_to_phys(fb_virt);
730 }
731
732 fb_info->fix.smem_start = fb_phys;
733 fb_info->screen_base = fb_virt;
734 fb_info->screen_size = fb_info->fix.smem_len = fb_size;
735
736 if (mxsfb_restore_mode(host))
737 memset(fb_virt, 0, fb_size);
738
739 return 0;
740 }
741
742 static void __devexit mxsfb_free_videomem(struct mxsfb_info *host)
743 {
744 struct fb_info *fb_info = &host->fb_info;
745
746 if (host->mapped) {
747 iounmap(fb_info->screen_base);
748 release_mem_region(fb_info->fix.smem_start,
749 fb_info->screen_size);
750 } else {
751 free_pages_exact(fb_info->screen_base, fb_info->fix.smem_len);
752 }
753 }
754
755 static struct platform_device_id mxsfb_devtype[] = {
756 {
757 .name = "imx23-fb",
758 .driver_data = MXSFB_V3,
759 }, {
760 .name = "imx28-fb",
761 .driver_data = MXSFB_V4,
762 }, {
763 /* sentinel */
764 }
765 };
766 MODULE_DEVICE_TABLE(platform, mxsfb_devtype);
767
768 static const struct of_device_id mxsfb_dt_ids[] = {
769 { .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devtype[0], },
770 { .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devtype[1], },
771 { /* sentinel */ }
772 };
773 MODULE_DEVICE_TABLE(of, mxsfb_dt_ids);
774
775 static int __devinit mxsfb_probe(struct platform_device *pdev)
776 {
777 const struct of_device_id *of_id =
778 of_match_device(mxsfb_dt_ids, &pdev->dev);
779 struct mxsfb_platform_data *pdata = pdev->dev.platform_data;
780 struct resource *res;
781 struct mxsfb_info *host;
782 struct fb_info *fb_info;
783 struct fb_modelist *modelist;
784 struct pinctrl *pinctrl;
785 int panel_enable;
786 enum of_gpio_flags flags;
787 int i, ret;
788
789 if (of_id)
790 pdev->id_entry = of_id->data;
791
792 if (!pdata) {
793 dev_err(&pdev->dev, "No platformdata. Giving up\n");
794 return -ENODEV;
795 }
796
797 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
798 if (!res) {
799 dev_err(&pdev->dev, "Cannot get memory IO resource\n");
800 return -ENODEV;
801 }
802
803 if (!request_mem_region(res->start, resource_size(res), pdev->name))
804 return -EBUSY;
805
806 fb_info = framebuffer_alloc(sizeof(struct mxsfb_info), &pdev->dev);
807 if (!fb_info) {
808 dev_err(&pdev->dev, "Failed to allocate fbdev\n");
809 ret = -ENOMEM;
810 goto error_alloc_info;
811 }
812
813 host = to_imxfb_host(fb_info);
814
815 host->base = ioremap(res->start, resource_size(res));
816 if (!host->base) {
817 dev_err(&pdev->dev, "ioremap failed\n");
818 ret = -ENOMEM;
819 goto error_ioremap;
820 }
821
822 host->pdev = pdev;
823 platform_set_drvdata(pdev, host);
824
825 host->devdata = &mxsfb_devdata[pdev->id_entry->driver_data];
826
827 pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
828 if (IS_ERR(pinctrl)) {
829 ret = PTR_ERR(pinctrl);
830 goto error_getpin;
831 }
832
833 host->clk = clk_get(&host->pdev->dev, NULL);
834 if (IS_ERR(host->clk)) {
835 ret = PTR_ERR(host->clk);
836 goto error_getclock;
837 }
838
839 panel_enable = of_get_named_gpio_flags(pdev->dev.of_node,
840 "panel-enable-gpios", 0, &flags);
841 if (gpio_is_valid(panel_enable)) {
842 unsigned long f = GPIOF_OUT_INIT_HIGH;
843 if (flags == OF_GPIO_ACTIVE_LOW)
844 f = GPIOF_OUT_INIT_LOW;
845 ret = devm_gpio_request_one(&pdev->dev, panel_enable,
846 f, "panel-enable");
847 if (ret) {
848 dev_err(&pdev->dev,
849 "failed to request gpio %d: %d\n",
850 panel_enable, ret);
851 goto error_panel_enable;
852 }
853 }
854
855 fb_info->pseudo_palette = kmalloc(sizeof(u32) * 16, GFP_KERNEL);
856 if (!fb_info->pseudo_palette) {
857 ret = -ENOMEM;
858 goto error_pseudo_pallette;
859 }
860
861 INIT_LIST_HEAD(&fb_info->modelist);
862
863 ret = mxsfb_init_fbinfo(host);
864 if (ret != 0)
865 goto error_init_fb;
866
867 for (i = 0; i < pdata->mode_count; i++)
868 fb_add_videomode(&pdata->mode_list[i], &fb_info->modelist);
869
870 modelist = list_first_entry(&fb_info->modelist,
871 struct fb_modelist, list);
872 fb_videomode_to_var(&fb_info->var, &modelist->mode);
873
874 /* init the color fields */
875 mxsfb_check_var(&fb_info->var, fb_info);
876
877 platform_set_drvdata(pdev, fb_info);
878
879 ret = register_framebuffer(fb_info);
880 if (ret != 0) {
881 dev_err(&pdev->dev,"Failed to register framebuffer\n");
882 goto error_register;
883 }
884
885 if (!host->enabled) {
886 writel(0, host->base + LCDC_CTRL);
887 mxsfb_set_par(fb_info);
888 mxsfb_enable_controller(fb_info);
889 }
890
891 dev_info(&pdev->dev, "initialized\n");
892
893 return 0;
894
895 error_register:
896 if (host->enabled)
897 clk_disable_unprepare(host->clk);
898 fb_destroy_modelist(&fb_info->modelist);
899 error_init_fb:
900 kfree(fb_info->pseudo_palette);
901 error_pseudo_pallette:
902 error_panel_enable:
903 clk_put(host->clk);
904 error_getclock:
905 error_getpin:
906 iounmap(host->base);
907 error_ioremap:
908 framebuffer_release(fb_info);
909 error_alloc_info:
910 release_mem_region(res->start, resource_size(res));
911
912 return ret;
913 }
914
915 static int __devexit mxsfb_remove(struct platform_device *pdev)
916 {
917 struct fb_info *fb_info = platform_get_drvdata(pdev);
918 struct mxsfb_info *host = to_imxfb_host(fb_info);
919 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
920
921 if (host->enabled)
922 mxsfb_disable_controller(fb_info);
923
924 unregister_framebuffer(fb_info);
925 kfree(fb_info->pseudo_palette);
926 mxsfb_free_videomem(host);
927 iounmap(host->base);
928 clk_put(host->clk);
929
930 framebuffer_release(fb_info);
931 release_mem_region(res->start, resource_size(res));
932
933 platform_set_drvdata(pdev, NULL);
934
935 return 0;
936 }
937
938 static void mxsfb_shutdown(struct platform_device *pdev)
939 {
940 struct fb_info *fb_info = platform_get_drvdata(pdev);
941 struct mxsfb_info *host = to_imxfb_host(fb_info);
942
943 /*
944 * Force stop the LCD controller as keeping it running during reboot
945 * might interfere with the BootROM's boot mode pads sampling.
946 */
947 writel(CTRL_RUN, host->base + LCDC_CTRL + REG_CLR);
948 }
949
950 static struct platform_driver mxsfb_driver = {
951 .probe = mxsfb_probe,
952 .remove = __devexit_p(mxsfb_remove),
953 .shutdown = mxsfb_shutdown,
954 .id_table = mxsfb_devtype,
955 .driver = {
956 .name = DRIVER_NAME,
957 .of_match_table = mxsfb_dt_ids,
958 },
959 };
960
961 module_platform_driver(mxsfb_driver);
962
963 MODULE_DESCRIPTION("Freescale mxs framebuffer driver");
964 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
965 MODULE_LICENSE("GPL");
Linux with added FPC-III support