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mm: revert "page-writeback.c: subtract min_free_kbytes from dirtyable memory"
[linux/fpc-iii.git] / drivers / video / mxsfb.c
blobd250ed0f806d3bf66d858e9f633852f3baa58f4d
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/platform_device.h>
46 #include <linux/clk.h>
47 #include <linux/dma-mapping.h>
48 #include <linux/io.h>
49 #include <linux/fb.h>
50 #include <linux/regulator/consumer.h>
51 #include <video/of_display_timing.h>
52 #include <video/videomode.h>
53
54 #define REG_SET 4
55 #define REG_CLR 8
56
57 #define LCDC_CTRL 0x00
58 #define LCDC_CTRL1 0x10
59 #define LCDC_V4_CTRL2 0x20
60 #define LCDC_V3_TRANSFER_COUNT 0x20
61 #define LCDC_V4_TRANSFER_COUNT 0x30
62 #define LCDC_V4_CUR_BUF 0x40
63 #define LCDC_V4_NEXT_BUF 0x50
64 #define LCDC_V3_CUR_BUF 0x30
65 #define LCDC_V3_NEXT_BUF 0x40
66 #define LCDC_TIMING 0x60
67 #define LCDC_VDCTRL0 0x70
68 #define LCDC_VDCTRL1 0x80
69 #define LCDC_VDCTRL2 0x90
70 #define LCDC_VDCTRL3 0xa0
71 #define LCDC_VDCTRL4 0xb0
72 #define LCDC_DVICTRL0 0xc0
73 #define LCDC_DVICTRL1 0xd0
74 #define LCDC_DVICTRL2 0xe0
75 #define LCDC_DVICTRL3 0xf0
76 #define LCDC_DVICTRL4 0x100
77 #define LCDC_V4_DATA 0x180
78 #define LCDC_V3_DATA 0x1b0
79 #define LCDC_V4_DEBUG0 0x1d0
80 #define LCDC_V3_DEBUG0 0x1f0
81
82 #define CTRL_SFTRST (1 << 31)
83 #define CTRL_CLKGATE (1 << 30)
84 #define CTRL_BYPASS_COUNT (1 << 19)
85 #define CTRL_VSYNC_MODE (1 << 18)
86 #define CTRL_DOTCLK_MODE (1 << 17)
87 #define CTRL_DATA_SELECT (1 << 16)
88 #define CTRL_SET_BUS_WIDTH(x) (((x) & 0x3) << 10)
89 #define CTRL_GET_BUS_WIDTH(x) (((x) >> 10) & 0x3)
90 #define CTRL_SET_WORD_LENGTH(x) (((x) & 0x3) << 8)
91 #define CTRL_GET_WORD_LENGTH(x) (((x) >> 8) & 0x3)
92 #define CTRL_MASTER (1 << 5)
93 #define CTRL_DF16 (1 << 3)
94 #define CTRL_DF18 (1 << 2)
95 #define CTRL_DF24 (1 << 1)
96 #define CTRL_RUN (1 << 0)
97
98 #define CTRL1_FIFO_CLEAR (1 << 21)
99 #define CTRL1_SET_BYTE_PACKAGING(x) (((x) & 0xf) << 16)
100 #define CTRL1_GET_BYTE_PACKAGING(x) (((x) >> 16) & 0xf)
101
102 #define TRANSFER_COUNT_SET_VCOUNT(x) (((x) & 0xffff) << 16)
103 #define TRANSFER_COUNT_GET_VCOUNT(x) (((x) >> 16) & 0xffff)
104 #define TRANSFER_COUNT_SET_HCOUNT(x) ((x) & 0xffff)
105 #define TRANSFER_COUNT_GET_HCOUNT(x) ((x) & 0xffff)
106
107
108 #define VDCTRL0_ENABLE_PRESENT (1 << 28)
109 #define VDCTRL0_VSYNC_ACT_HIGH (1 << 27)
110 #define VDCTRL0_HSYNC_ACT_HIGH (1 << 26)
111 #define VDCTRL0_DOTCLK_ACT_FALLING (1 << 25)
112 #define VDCTRL0_ENABLE_ACT_HIGH (1 << 24)
113 #define VDCTRL0_VSYNC_PERIOD_UNIT (1 << 21)
114 #define VDCTRL0_VSYNC_PULSE_WIDTH_UNIT (1 << 20)
115 #define VDCTRL0_HALF_LINE (1 << 19)
116 #define VDCTRL0_HALF_LINE_MODE (1 << 18)
117 #define VDCTRL0_SET_VSYNC_PULSE_WIDTH(x) ((x) & 0x3ffff)
118 #define VDCTRL0_GET_VSYNC_PULSE_WIDTH(x) ((x) & 0x3ffff)
119
120 #define VDCTRL2_SET_HSYNC_PERIOD(x) ((x) & 0x3ffff)
121 #define VDCTRL2_GET_HSYNC_PERIOD(x) ((x) & 0x3ffff)
122
123 #define VDCTRL3_MUX_SYNC_SIGNALS (1 << 29)
124 #define VDCTRL3_VSYNC_ONLY (1 << 28)
125 #define SET_HOR_WAIT_CNT(x) (((x) & 0xfff) << 16)
126 #define GET_HOR_WAIT_CNT(x) (((x) >> 16) & 0xfff)
127 #define SET_VERT_WAIT_CNT(x) ((x) & 0xffff)
128 #define GET_VERT_WAIT_CNT(x) ((x) & 0xffff)
129
130 #define VDCTRL4_SET_DOTCLK_DLY(x) (((x) & 0x7) << 29) /* v4 only */
131 #define VDCTRL4_GET_DOTCLK_DLY(x) (((x) >> 29) & 0x7) /* v4 only */
132 #define VDCTRL4_SYNC_SIGNALS_ON (1 << 18)
133 #define SET_DOTCLK_H_VALID_DATA_CNT(x) ((x) & 0x3ffff)
134
135 #define DEBUG0_HSYNC (1 < 26)
136 #define DEBUG0_VSYNC (1 < 25)
137
138 #define MIN_XRES 120
139 #define MIN_YRES 120
140
141 #define RED 0
142 #define GREEN 1
143 #define BLUE 2
144 #define TRANSP 3
145
146 #define STMLCDIF_8BIT 1 /** pixel data bus to the display is of 8 bit width */
147 #define STMLCDIF_16BIT 0 /** pixel data bus to the display is of 16 bit width */
148 #define STMLCDIF_18BIT 2 /** pixel data bus to the display is of 18 bit width */
149 #define STMLCDIF_24BIT 3 /** pixel data bus to the display is of 24 bit width */
150
151 #define MXSFB_SYNC_DATA_ENABLE_HIGH_ACT (1 << 6)
152 #define MXSFB_SYNC_DOTCLK_FALLING_ACT (1 << 7) /* negtive edge sampling */
153
154 enum mxsfb_devtype {
155 MXSFB_V3,
156 MXSFB_V4,
157 };
158
159 /* CPU dependent register offsets */
160 struct mxsfb_devdata {
161 unsigned transfer_count;
162 unsigned cur_buf;
163 unsigned next_buf;
164 unsigned debug0;
165 unsigned hs_wdth_mask;
166 unsigned hs_wdth_shift;
167 unsigned ipversion;
168 };
169
170 struct mxsfb_info {
171 struct fb_info fb_info;
172 struct platform_device *pdev;
173 struct clk *clk;
174 void __iomem *base; /* registers */
175 unsigned allocated_size;
176 int enabled;
177 unsigned ld_intf_width;
178 unsigned dotclk_delay;
179 const struct mxsfb_devdata *devdata;
180 u32 sync;
181 struct regulator *reg_lcd;
182 };
183
184 #define mxsfb_is_v3(host) (host->devdata->ipversion == 3)
185 #define mxsfb_is_v4(host) (host->devdata->ipversion == 4)
186
187 static const struct mxsfb_devdata mxsfb_devdata[] = {
188 [MXSFB_V3] = {
189 .transfer_count = LCDC_V3_TRANSFER_COUNT,
190 .cur_buf = LCDC_V3_CUR_BUF,
191 .next_buf = LCDC_V3_NEXT_BUF,
192 .debug0 = LCDC_V3_DEBUG0,
193 .hs_wdth_mask = 0xff,
194 .hs_wdth_shift = 24,
195 .ipversion = 3,
196 },
197 [MXSFB_V4] = {
198 .transfer_count = LCDC_V4_TRANSFER_COUNT,
199 .cur_buf = LCDC_V4_CUR_BUF,
200 .next_buf = LCDC_V4_NEXT_BUF,
201 .debug0 = LCDC_V4_DEBUG0,
202 .hs_wdth_mask = 0x3fff,
203 .hs_wdth_shift = 18,
204 .ipversion = 4,
205 },
206 };
207
208 #define to_imxfb_host(x) (container_of(x, struct mxsfb_info, fb_info))
209
210 /* mask and shift depends on architecture */
211 static inline u32 set_hsync_pulse_width(struct mxsfb_info *host, unsigned val)
212 {
213 return (val & host->devdata->hs_wdth_mask) <<
214 host->devdata->hs_wdth_shift;
215 }
216
217 static inline u32 get_hsync_pulse_width(struct mxsfb_info *host, unsigned val)
218 {
219 return (val >> host->devdata->hs_wdth_shift) &
220 host->devdata->hs_wdth_mask;
221 }
222
223 static const struct fb_bitfield def_rgb565[] = {
224 [RED] = {
225 .offset = 11,
226 .length = 5,
227 },
228 [GREEN] = {
229 .offset = 5,
230 .length = 6,
231 },
232 [BLUE] = {
233 .offset = 0,
234 .length = 5,
235 },
236 [TRANSP] = { /* no support for transparency */
237 .length = 0,
238 }
239 };
240
241 static const struct fb_bitfield def_rgb888[] = {
242 [RED] = {
243 .offset = 16,
244 .length = 8,
245 },
246 [GREEN] = {
247 .offset = 8,
248 .length = 8,
249 },
250 [BLUE] = {
251 .offset = 0,
252 .length = 8,
253 },
254 [TRANSP] = { /* no support for transparency */
255 .length = 0,
256 }
257 };
258
259 static inline unsigned chan_to_field(unsigned chan, struct fb_bitfield *bf)
260 {
261 chan &= 0xffff;
262 chan >>= 16 - bf->length;
263 return chan << bf->offset;
264 }
265
266 static int mxsfb_check_var(struct fb_var_screeninfo *var,
267 struct fb_info *fb_info)
268 {
269 struct mxsfb_info *host = to_imxfb_host(fb_info);
270 const struct fb_bitfield *rgb = NULL;
271
272 if (var->xres < MIN_XRES)
273 var->xres = MIN_XRES;
274 if (var->yres < MIN_YRES)
275 var->yres = MIN_YRES;
276
277 var->xres_virtual = var->xres;
278
279 var->yres_virtual = var->yres;
280
281 switch (var->bits_per_pixel) {
282 case 16:
283 /* always expect RGB 565 */
284 rgb = def_rgb565;
285 break;
286 case 32:
287 switch (host->ld_intf_width) {
288 case STMLCDIF_8BIT:
289 pr_debug("Unsupported LCD bus width mapping\n");
290 break;
291 case STMLCDIF_16BIT:
292 case STMLCDIF_18BIT:
293 case STMLCDIF_24BIT:
294 /* real 24 bit */
295 rgb = def_rgb888;
296 break;
297 }
298 break;
299 default:
300 pr_debug("Unsupported colour depth: %u\n", var->bits_per_pixel);
301 return -EINVAL;
302 }
303
304 /*
305 * Copy the RGB parameters for this display
306 * from the machine specific parameters.
307 */
308 var->red = rgb[RED];
309 var->green = rgb[GREEN];
310 var->blue = rgb[BLUE];
311 var->transp = rgb[TRANSP];
312
313 return 0;
314 }
315
316 static void mxsfb_enable_controller(struct fb_info *fb_info)
317 {
318 struct mxsfb_info *host = to_imxfb_host(fb_info);
319 u32 reg;
320 int ret;
321
322 dev_dbg(&host->pdev->dev, "%s\n", __func__);
323
324 if (host->reg_lcd) {
325 ret = regulator_enable(host->reg_lcd);
326 if (ret) {
327 dev_err(&host->pdev->dev,
328 "lcd regulator enable failed: %d\n", ret);
329 return;
330 }
331 }
332
333 clk_prepare_enable(host->clk);
334 clk_set_rate(host->clk, PICOS2KHZ(fb_info->var.pixclock) * 1000U);
335
336 /* if it was disabled, re-enable the mode again */
337 writel(CTRL_DOTCLK_MODE, host->base + LCDC_CTRL + REG_SET);
338
339 /* enable the SYNC signals first, then the DMA engine */
340 reg = readl(host->base + LCDC_VDCTRL4);
341 reg |= VDCTRL4_SYNC_SIGNALS_ON;
342 writel(reg, host->base + LCDC_VDCTRL4);
343
344 writel(CTRL_RUN, host->base + LCDC_CTRL + REG_SET);
345
346 host->enabled = 1;
347 }
348
349 static void mxsfb_disable_controller(struct fb_info *fb_info)
350 {
351 struct mxsfb_info *host = to_imxfb_host(fb_info);
352 unsigned loop;
353 u32 reg;
354 int ret;
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 reg = readl(host->base + LCDC_VDCTRL4);
373 writel(reg & ~VDCTRL4_SYNC_SIGNALS_ON, host->base + LCDC_VDCTRL4);
374
375 clk_disable_unprepare(host->clk);
376
377 host->enabled = 0;
378
379 if (host->reg_lcd) {
380 ret = regulator_disable(host->reg_lcd);
381 if (ret)
382 dev_err(&host->pdev->dev,
383 "lcd regulator disable failed: %d\n", ret);
384 }
385 }
386
387 static int mxsfb_set_par(struct fb_info *fb_info)
388 {
389 struct mxsfb_info *host = to_imxfb_host(fb_info);
390 u32 ctrl, vdctrl0, vdctrl4;
391 int line_size, fb_size;
392 int reenable = 0;
393
394 line_size = fb_info->var.xres * (fb_info->var.bits_per_pixel >> 3);
395 fb_size = fb_info->var.yres_virtual * line_size;
396
397 if (fb_size > fb_info->fix.smem_len)
398 return -ENOMEM;
399
400 fb_info->fix.line_length = line_size;
401
402 /*
403 * It seems, you can't re-program the controller if it is still running.
404 * This may lead into shifted pictures (FIFO issue?).
405 * So, first stop the controller and drain its FIFOs
406 */
407 if (host->enabled) {
408 reenable = 1;
409 mxsfb_disable_controller(fb_info);
410 }
411
412 /* clear the FIFOs */
413 writel(CTRL1_FIFO_CLEAR, host->base + LCDC_CTRL1 + REG_SET);
414
415 ctrl = CTRL_BYPASS_COUNT | CTRL_MASTER |
416 CTRL_SET_BUS_WIDTH(host->ld_intf_width);
417
418 switch (fb_info->var.bits_per_pixel) {
419 case 16:
420 dev_dbg(&host->pdev->dev, "Setting up RGB565 mode\n");
421 ctrl |= CTRL_SET_WORD_LENGTH(0);
422 writel(CTRL1_SET_BYTE_PACKAGING(0xf), host->base + LCDC_CTRL1);
423 break;
424 case 32:
425 dev_dbg(&host->pdev->dev, "Setting up RGB888/666 mode\n");
426 ctrl |= CTRL_SET_WORD_LENGTH(3);
427 switch (host->ld_intf_width) {
428 case STMLCDIF_8BIT:
429 dev_dbg(&host->pdev->dev,
430 "Unsupported LCD bus width mapping\n");
431 return -EINVAL;
432 case STMLCDIF_16BIT:
433 case STMLCDIF_18BIT:
434 case STMLCDIF_24BIT:
435 /* real 24 bit */
436 break;
437 }
438 /* do not use packed pixels = one pixel per word instead */
439 writel(CTRL1_SET_BYTE_PACKAGING(0x7), host->base + LCDC_CTRL1);
440 break;
441 default:
442 dev_dbg(&host->pdev->dev, "Unhandled color depth of %u\n",
443 fb_info->var.bits_per_pixel);
444 return -EINVAL;
445 }
446
447 writel(ctrl, host->base + LCDC_CTRL);
448
449 writel(TRANSFER_COUNT_SET_VCOUNT(fb_info->var.yres) |
450 TRANSFER_COUNT_SET_HCOUNT(fb_info->var.xres),
451 host->base + host->devdata->transfer_count);
452
453 vdctrl0 = VDCTRL0_ENABLE_PRESENT | /* always in DOTCLOCK mode */
454 VDCTRL0_VSYNC_PERIOD_UNIT |
455 VDCTRL0_VSYNC_PULSE_WIDTH_UNIT |
456 VDCTRL0_SET_VSYNC_PULSE_WIDTH(fb_info->var.vsync_len);
457 if (fb_info->var.sync & FB_SYNC_HOR_HIGH_ACT)
458 vdctrl0 |= VDCTRL0_HSYNC_ACT_HIGH;
459 if (fb_info->var.sync & FB_SYNC_VERT_HIGH_ACT)
460 vdctrl0 |= VDCTRL0_VSYNC_ACT_HIGH;
461 if (host->sync & MXSFB_SYNC_DATA_ENABLE_HIGH_ACT)
462 vdctrl0 |= VDCTRL0_ENABLE_ACT_HIGH;
463 if (host->sync & MXSFB_SYNC_DOTCLK_FALLING_ACT)
464 vdctrl0 |= VDCTRL0_DOTCLK_ACT_FALLING;
465
466 writel(vdctrl0, host->base + LCDC_VDCTRL0);
467
468 /* frame length in lines */
469 writel(fb_info->var.upper_margin + fb_info->var.vsync_len +
470 fb_info->var.lower_margin + fb_info->var.yres,
471 host->base + LCDC_VDCTRL1);
472
473 /* line length in units of clocks or pixels */
474 writel(set_hsync_pulse_width(host, fb_info->var.hsync_len) |
475 VDCTRL2_SET_HSYNC_PERIOD(fb_info->var.left_margin +
476 fb_info->var.hsync_len + fb_info->var.right_margin +
477 fb_info->var.xres),
478 host->base + LCDC_VDCTRL2);
479
480 writel(SET_HOR_WAIT_CNT(fb_info->var.left_margin +
481 fb_info->var.hsync_len) |
482 SET_VERT_WAIT_CNT(fb_info->var.upper_margin +
483 fb_info->var.vsync_len),
484 host->base + LCDC_VDCTRL3);
485
486 vdctrl4 = SET_DOTCLK_H_VALID_DATA_CNT(fb_info->var.xres);
487 if (mxsfb_is_v4(host))
488 vdctrl4 |= VDCTRL4_SET_DOTCLK_DLY(host->dotclk_delay);
489 writel(vdctrl4, host->base + LCDC_VDCTRL4);
490
491 writel(fb_info->fix.smem_start +
492 fb_info->fix.line_length * fb_info->var.yoffset,
493 host->base + host->devdata->next_buf);
494
495 if (reenable)
496 mxsfb_enable_controller(fb_info);
497
498 return 0;
499 }
500
501 static int mxsfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
502 u_int transp, struct fb_info *fb_info)
503 {
504 unsigned int val;
505 int ret = -EINVAL;
506
507 /*
508 * If greyscale is true, then we convert the RGB value
509 * to greyscale no matter what visual we are using.
510 */
511 if (fb_info->var.grayscale)
512 red = green = blue = (19595 * red + 38470 * green +
513 7471 * blue) >> 16;
514
515 switch (fb_info->fix.visual) {
516 case FB_VISUAL_TRUECOLOR:
517 /*
518 * 12 or 16-bit True Colour. We encode the RGB value
519 * according to the RGB bitfield information.
520 */
521 if (regno < 16) {
522 u32 *pal = fb_info->pseudo_palette;
523
524 val = chan_to_field(red, &fb_info->var.red);
525 val |= chan_to_field(green, &fb_info->var.green);
526 val |= chan_to_field(blue, &fb_info->var.blue);
527
528 pal[regno] = val;
529 ret = 0;
530 }
531 break;
532
533 case FB_VISUAL_STATIC_PSEUDOCOLOR:
534 case FB_VISUAL_PSEUDOCOLOR:
535 break;
536 }
537
538 return ret;
539 }
540
541 static int mxsfb_blank(int blank, struct fb_info *fb_info)
542 {
543 struct mxsfb_info *host = to_imxfb_host(fb_info);
544
545 switch (blank) {
546 case FB_BLANK_POWERDOWN:
547 case FB_BLANK_VSYNC_SUSPEND:
548 case FB_BLANK_HSYNC_SUSPEND:
549 case FB_BLANK_NORMAL:
550 if (host->enabled)
551 mxsfb_disable_controller(fb_info);
552 break;
553
554 case FB_BLANK_UNBLANK:
555 if (!host->enabled)
556 mxsfb_enable_controller(fb_info);
557 break;
558 }
559 return 0;
560 }
561
562 static int mxsfb_pan_display(struct fb_var_screeninfo *var,
563 struct fb_info *fb_info)
564 {
565 struct mxsfb_info *host = to_imxfb_host(fb_info);
566 unsigned offset;
567
568 if (var->xoffset != 0)
569 return -EINVAL;
570
571 offset = fb_info->fix.line_length * var->yoffset;
572
573 /* update on next VSYNC */
574 writel(fb_info->fix.smem_start + offset,
575 host->base + host->devdata->next_buf);
576
577 return 0;
578 }
579
580 static struct fb_ops mxsfb_ops = {
581 .owner = THIS_MODULE,
582 .fb_check_var = mxsfb_check_var,
583 .fb_set_par = mxsfb_set_par,
584 .fb_setcolreg = mxsfb_setcolreg,
585 .fb_blank = mxsfb_blank,
586 .fb_pan_display = mxsfb_pan_display,
587 .fb_fillrect = cfb_fillrect,
588 .fb_copyarea = cfb_copyarea,
589 .fb_imageblit = cfb_imageblit,
590 };
591
592 static int mxsfb_restore_mode(struct mxsfb_info *host)
593 {
594 struct fb_info *fb_info = &host->fb_info;
595 unsigned line_count;
596 unsigned period;
597 unsigned long pa, fbsize;
598 int bits_per_pixel, ofs;
599 u32 transfer_count, vdctrl0, vdctrl2, vdctrl3, vdctrl4, ctrl;
600 struct fb_videomode vmode;
601
602 /* Only restore the mode when the controller is running */
603 ctrl = readl(host->base + LCDC_CTRL);
604 if (!(ctrl & CTRL_RUN))
605 return -EINVAL;
606
607 vdctrl0 = readl(host->base + LCDC_VDCTRL0);
608 vdctrl2 = readl(host->base + LCDC_VDCTRL2);
609 vdctrl3 = readl(host->base + LCDC_VDCTRL3);
610 vdctrl4 = readl(host->base + LCDC_VDCTRL4);
611
612 transfer_count = readl(host->base + host->devdata->transfer_count);
613
614 vmode.xres = TRANSFER_COUNT_GET_HCOUNT(transfer_count);
615 vmode.yres = TRANSFER_COUNT_GET_VCOUNT(transfer_count);
616
617 switch (CTRL_GET_WORD_LENGTH(ctrl)) {
618 case 0:
619 bits_per_pixel = 16;
620 break;
621 case 3:
622 bits_per_pixel = 32;
623 case 1:
624 default:
625 return -EINVAL;
626 }
627
628 fb_info->var.bits_per_pixel = bits_per_pixel;
629
630 vmode.pixclock = KHZ2PICOS(clk_get_rate(host->clk) / 1000U);
631 vmode.hsync_len = get_hsync_pulse_width(host, vdctrl2);
632 vmode.left_margin = GET_HOR_WAIT_CNT(vdctrl3) - vmode.hsync_len;
633 vmode.right_margin = VDCTRL2_GET_HSYNC_PERIOD(vdctrl2) - vmode.hsync_len -
634 vmode.left_margin - vmode.xres;
635 vmode.vsync_len = VDCTRL0_GET_VSYNC_PULSE_WIDTH(vdctrl0);
636 period = readl(host->base + LCDC_VDCTRL1);
637 vmode.upper_margin = GET_VERT_WAIT_CNT(vdctrl3) - vmode.vsync_len;
638 vmode.lower_margin = period - vmode.vsync_len - vmode.upper_margin - vmode.yres;
639
640 vmode.vmode = FB_VMODE_NONINTERLACED;
641
642 vmode.sync = 0;
643 if (vdctrl0 & VDCTRL0_HSYNC_ACT_HIGH)
644 vmode.sync |= FB_SYNC_HOR_HIGH_ACT;
645 if (vdctrl0 & VDCTRL0_VSYNC_ACT_HIGH)
646 vmode.sync |= FB_SYNC_VERT_HIGH_ACT;
647
648 pr_debug("Reconstructed video mode:\n");
649 pr_debug("%dx%d, hsync: %u left: %u, right: %u, vsync: %u, upper: %u, lower: %u\n",
650 vmode.xres, vmode.yres,
651 vmode.hsync_len, vmode.left_margin, vmode.right_margin,
652 vmode.vsync_len, vmode.upper_margin, vmode.lower_margin);
653 pr_debug("pixclk: %ldkHz\n", PICOS2KHZ(vmode.pixclock));
654
655 fb_add_videomode(&vmode, &fb_info->modelist);
656
657 host->ld_intf_width = CTRL_GET_BUS_WIDTH(ctrl);
658 host->dotclk_delay = VDCTRL4_GET_DOTCLK_DLY(vdctrl4);
659
660 fb_info->fix.line_length = vmode.xres * (bits_per_pixel >> 3);
661
662 pa = readl(host->base + host->devdata->cur_buf);
663 fbsize = fb_info->fix.line_length * vmode.yres;
664 if (pa < fb_info->fix.smem_start)
665 return -EINVAL;
666 if (pa + fbsize > fb_info->fix.smem_start + fb_info->fix.smem_len)
667 return -EINVAL;
668 ofs = pa - fb_info->fix.smem_start;
669 if (ofs) {
670 memmove(fb_info->screen_base, fb_info->screen_base + ofs, fbsize);
671 writel(fb_info->fix.smem_start, host->base + host->devdata->next_buf);
672 }
673
674 line_count = fb_info->fix.smem_len / fb_info->fix.line_length;
675 fb_info->fix.ypanstep = 1;
676
677 clk_prepare_enable(host->clk);
678 host->enabled = 1;
679
680 return 0;
681 }
682
683 static int mxsfb_init_fbinfo_dt(struct mxsfb_info *host)
684 {
685 struct fb_info *fb_info = &host->fb_info;
686 struct fb_var_screeninfo *var = &fb_info->var;
687 struct device *dev = &host->pdev->dev;
688 struct device_node *np = host->pdev->dev.of_node;
689 struct device_node *display_np;
690 struct device_node *timings_np;
691 struct display_timings *timings;
692 u32 width;
693 int i;
694 int ret = 0;
695
696 display_np = of_parse_phandle(np, "display", 0);
697 if (!display_np) {
698 dev_err(dev, "failed to find display phandle\n");
699 return -ENOENT;
700 }
701
702 ret = of_property_read_u32(display_np, "bus-width", &width);
703 if (ret < 0) {
704 dev_err(dev, "failed to get property bus-width\n");
705 goto put_display_node;
706 }
707
708 switch (width) {
709 case 8:
710 host->ld_intf_width = STMLCDIF_8BIT;
711 break;
712 case 16:
713 host->ld_intf_width = STMLCDIF_16BIT;
714 break;
715 case 18:
716 host->ld_intf_width = STMLCDIF_18BIT;
717 break;
718 case 24:
719 host->ld_intf_width = STMLCDIF_24BIT;
720 break;
721 default:
722 dev_err(dev, "invalid bus-width value\n");
723 ret = -EINVAL;
724 goto put_display_node;
725 }
726
727 ret = of_property_read_u32(display_np, "bits-per-pixel",
728 &var->bits_per_pixel);
729 if (ret < 0) {
730 dev_err(dev, "failed to get property bits-per-pixel\n");
731 goto put_display_node;
732 }
733
734 timings = of_get_display_timings(display_np);
735 if (!timings) {
736 dev_err(dev, "failed to get display timings\n");
737 ret = -ENOENT;
738 goto put_display_node;
739 }
740
741 timings_np = of_find_node_by_name(display_np,
742 "display-timings");
743 if (!timings_np) {
744 dev_err(dev, "failed to find display-timings node\n");
745 ret = -ENOENT;
746 goto put_display_node;
747 }
748
749 for (i = 0; i < of_get_child_count(timings_np); i++) {
750 struct videomode vm;
751 struct fb_videomode fb_vm;
752
753 ret = videomode_from_timings(timings, &vm, i);
754 if (ret < 0)
755 goto put_timings_node;
756 ret = fb_videomode_from_videomode(&vm, &fb_vm);
757 if (ret < 0)
758 goto put_timings_node;
759
760 if (vm.flags & DISPLAY_FLAGS_DE_HIGH)
761 host->sync |= MXSFB_SYNC_DATA_ENABLE_HIGH_ACT;
762 if (vm.flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
763 host->sync |= MXSFB_SYNC_DOTCLK_FALLING_ACT;
764 fb_add_videomode(&fb_vm, &fb_info->modelist);
765 }
766
767 put_timings_node:
768 of_node_put(timings_np);
769 put_display_node:
770 of_node_put(display_np);
771 return ret;
772 }
773
774 static int mxsfb_init_fbinfo(struct mxsfb_info *host)
775 {
776 struct fb_info *fb_info = &host->fb_info;
777 struct fb_var_screeninfo *var = &fb_info->var;
778 dma_addr_t fb_phys;
779 void *fb_virt;
780 unsigned fb_size;
781 int ret;
782
783 fb_info->fbops = &mxsfb_ops;
784 fb_info->flags = FBINFO_FLAG_DEFAULT | FBINFO_READS_FAST;
785 strlcpy(fb_info->fix.id, "mxs", sizeof(fb_info->fix.id));
786 fb_info->fix.type = FB_TYPE_PACKED_PIXELS;
787 fb_info->fix.ypanstep = 1;
788 fb_info->fix.visual = FB_VISUAL_TRUECOLOR,
789 fb_info->fix.accel = FB_ACCEL_NONE;
790
791 ret = mxsfb_init_fbinfo_dt(host);
792 if (ret)
793 return ret;
794
795 var->nonstd = 0;
796 var->activate = FB_ACTIVATE_NOW;
797 var->accel_flags = 0;
798 var->vmode = FB_VMODE_NONINTERLACED;
799
800 /* Memory allocation for framebuffer */
801 fb_size = SZ_2M;
802 fb_virt = alloc_pages_exact(fb_size, GFP_DMA);
803 if (!fb_virt)
804 return -ENOMEM;
805
806 fb_phys = virt_to_phys(fb_virt);
807
808 fb_info->fix.smem_start = fb_phys;
809 fb_info->screen_base = fb_virt;
810 fb_info->screen_size = fb_info->fix.smem_len = fb_size;
811
812 if (mxsfb_restore_mode(host))
813 memset(fb_virt, 0, fb_size);
814
815 return 0;
816 }
817
818 static void mxsfb_free_videomem(struct mxsfb_info *host)
819 {
820 struct fb_info *fb_info = &host->fb_info;
821
822 free_pages_exact(fb_info->screen_base, fb_info->fix.smem_len);
823 }
824
825 static struct platform_device_id mxsfb_devtype[] = {
826 {
827 .name = "imx23-fb",
828 .driver_data = MXSFB_V3,
829 }, {
830 .name = "imx28-fb",
831 .driver_data = MXSFB_V4,
832 }, {
833 /* sentinel */
834 }
835 };
836 MODULE_DEVICE_TABLE(platform, mxsfb_devtype);
837
838 static const struct of_device_id mxsfb_dt_ids[] = {
839 { .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devtype[0], },
840 { .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devtype[1], },
841 { /* sentinel */ }
842 };
843 MODULE_DEVICE_TABLE(of, mxsfb_dt_ids);
844
845 static int mxsfb_probe(struct platform_device *pdev)
846 {
847 const struct of_device_id *of_id =
848 of_match_device(mxsfb_dt_ids, &pdev->dev);
849 struct resource *res;
850 struct mxsfb_info *host;
851 struct fb_info *fb_info;
852 struct fb_modelist *modelist;
853 int ret;
854
855 if (of_id)
856 pdev->id_entry = of_id->data;
857
858 fb_info = framebuffer_alloc(sizeof(struct mxsfb_info), &pdev->dev);
859 if (!fb_info) {
860 dev_err(&pdev->dev, "Failed to allocate fbdev\n");
861 return -ENOMEM;
862 }
863
864 host = to_imxfb_host(fb_info);
865
866 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
867 host->base = devm_ioremap_resource(&pdev->dev, res);
868 if (IS_ERR(host->base)) {
869 ret = PTR_ERR(host->base);
870 goto fb_release;
871 }
872
873 host->pdev = pdev;
874 platform_set_drvdata(pdev, host);
875
876 host->devdata = &mxsfb_devdata[pdev->id_entry->driver_data];
877
878 host->clk = devm_clk_get(&host->pdev->dev, NULL);
879 if (IS_ERR(host->clk)) {
880 ret = PTR_ERR(host->clk);
881 goto fb_release;
882 }
883
884 host->reg_lcd = devm_regulator_get(&pdev->dev, "lcd");
885 if (IS_ERR(host->reg_lcd))
886 host->reg_lcd = NULL;
887
888 fb_info->pseudo_palette = devm_kzalloc(&pdev->dev, sizeof(u32) * 16,
889 GFP_KERNEL);
890 if (!fb_info->pseudo_palette) {
891 ret = -ENOMEM;
892 goto fb_release;
893 }
894
895 INIT_LIST_HEAD(&fb_info->modelist);
896
897 ret = mxsfb_init_fbinfo(host);
898 if (ret != 0)
899 goto fb_release;
900
901 modelist = list_first_entry(&fb_info->modelist,
902 struct fb_modelist, list);
903 fb_videomode_to_var(&fb_info->var, &modelist->mode);
904
905 /* init the color fields */
906 mxsfb_check_var(&fb_info->var, fb_info);
907
908 platform_set_drvdata(pdev, fb_info);
909
910 ret = register_framebuffer(fb_info);
911 if (ret != 0) {
912 dev_err(&pdev->dev,"Failed to register framebuffer\n");
913 goto fb_destroy;
914 }
915
916 if (!host->enabled) {
917 writel(0, host->base + LCDC_CTRL);
918 mxsfb_set_par(fb_info);
919 mxsfb_enable_controller(fb_info);
920 }
921
922 dev_info(&pdev->dev, "initialized\n");
923
924 return 0;
925
926 fb_destroy:
927 if (host->enabled)
928 clk_disable_unprepare(host->clk);
929 fb_destroy_modelist(&fb_info->modelist);
930 fb_release:
931 framebuffer_release(fb_info);
932
933 return ret;
934 }
935
936 static int mxsfb_remove(struct platform_device *pdev)
937 {
938 struct fb_info *fb_info = platform_get_drvdata(pdev);
939 struct mxsfb_info *host = to_imxfb_host(fb_info);
940
941 if (host->enabled)
942 mxsfb_disable_controller(fb_info);
943
944 unregister_framebuffer(fb_info);
945 mxsfb_free_videomem(host);
946
947 framebuffer_release(fb_info);
948
949 return 0;
950 }
951
952 static void mxsfb_shutdown(struct platform_device *pdev)
953 {
954 struct fb_info *fb_info = platform_get_drvdata(pdev);
955 struct mxsfb_info *host = to_imxfb_host(fb_info);
956
957 /*
958 * Force stop the LCD controller as keeping it running during reboot
959 * might interfere with the BootROM's boot mode pads sampling.
960 */
961 writel(CTRL_RUN, host->base + LCDC_CTRL + REG_CLR);
962 }
963
964 static struct platform_driver mxsfb_driver = {
965 .probe = mxsfb_probe,
966 .remove = mxsfb_remove,
967 .shutdown = mxsfb_shutdown,
968 .id_table = mxsfb_devtype,
969 .driver = {
970 .name = DRIVER_NAME,
971 .of_match_table = mxsfb_dt_ids,
972 },
973 };
974
975 module_platform_driver(mxsfb_driver);
976
977 MODULE_DESCRIPTION("Freescale mxs framebuffer driver");
978 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
979 MODULE_LICENSE("GPL");
Linux with added FPC-III support