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/of_videomode.h>
53 #include <video/videomode.h>
54
55 #define REG_SET 4
56 #define REG_CLR 8
57
58 #define LCDC_CTRL 0x00
59 #define LCDC_CTRL1 0x10
60 #define LCDC_V4_CTRL2 0x20
61 #define LCDC_V3_TRANSFER_COUNT 0x20
62 #define LCDC_V4_TRANSFER_COUNT 0x30
63 #define LCDC_V4_CUR_BUF 0x40
64 #define LCDC_V4_NEXT_BUF 0x50
65 #define LCDC_V3_CUR_BUF 0x30
66 #define LCDC_V3_NEXT_BUF 0x40
67 #define LCDC_TIMING 0x60
68 #define LCDC_VDCTRL0 0x70
69 #define LCDC_VDCTRL1 0x80
70 #define LCDC_VDCTRL2 0x90
71 #define LCDC_VDCTRL3 0xa0
72 #define LCDC_VDCTRL4 0xb0
73 #define LCDC_DVICTRL0 0xc0
74 #define LCDC_DVICTRL1 0xd0
75 #define LCDC_DVICTRL2 0xe0
76 #define LCDC_DVICTRL3 0xf0
77 #define LCDC_DVICTRL4 0x100
78 #define LCDC_V4_DATA 0x180
79 #define LCDC_V3_DATA 0x1b0
80 #define LCDC_V4_DEBUG0 0x1d0
81 #define LCDC_V3_DEBUG0 0x1f0
82
83 #define CTRL_SFTRST (1 << 31)
84 #define CTRL_CLKGATE (1 << 30)
85 #define CTRL_BYPASS_COUNT (1 << 19)
86 #define CTRL_VSYNC_MODE (1 << 18)
87 #define CTRL_DOTCLK_MODE (1 << 17)
88 #define CTRL_DATA_SELECT (1 << 16)
89 #define CTRL_SET_BUS_WIDTH(x) (((x) & 0x3) << 10)
90 #define CTRL_GET_BUS_WIDTH(x) (((x) >> 10) & 0x3)
91 #define CTRL_SET_WORD_LENGTH(x) (((x) & 0x3) << 8)
92 #define CTRL_GET_WORD_LENGTH(x) (((x) >> 8) & 0x3)
93 #define CTRL_MASTER (1 << 5)
94 #define CTRL_DF16 (1 << 3)
95 #define CTRL_DF18 (1 << 2)
96 #define CTRL_DF24 (1 << 1)
97 #define CTRL_RUN (1 << 0)
98
99 #define CTRL1_FIFO_CLEAR (1 << 21)
100 #define CTRL1_SET_BYTE_PACKAGING(x) (((x) & 0xf) << 16)
101 #define CTRL1_GET_BYTE_PACKAGING(x) (((x) >> 16) & 0xf)
102
103 #define TRANSFER_COUNT_SET_VCOUNT(x) (((x) & 0xffff) << 16)
104 #define TRANSFER_COUNT_GET_VCOUNT(x) (((x) >> 16) & 0xffff)
105 #define TRANSFER_COUNT_SET_HCOUNT(x) ((x) & 0xffff)
106 #define TRANSFER_COUNT_GET_HCOUNT(x) ((x) & 0xffff)
107
108
109 #define VDCTRL0_ENABLE_PRESENT (1 << 28)
110 #define VDCTRL0_VSYNC_ACT_HIGH (1 << 27)
111 #define VDCTRL0_HSYNC_ACT_HIGH (1 << 26)
112 #define VDCTRL0_DOTCLK_ACT_FALLING (1 << 25)
113 #define VDCTRL0_ENABLE_ACT_HIGH (1 << 24)
114 #define VDCTRL0_VSYNC_PERIOD_UNIT (1 << 21)
115 #define VDCTRL0_VSYNC_PULSE_WIDTH_UNIT (1 << 20)
116 #define VDCTRL0_HALF_LINE (1 << 19)
117 #define VDCTRL0_HALF_LINE_MODE (1 << 18)
118 #define VDCTRL0_SET_VSYNC_PULSE_WIDTH(x) ((x) & 0x3ffff)
119 #define VDCTRL0_GET_VSYNC_PULSE_WIDTH(x) ((x) & 0x3ffff)
120
121 #define VDCTRL2_SET_HSYNC_PERIOD(x) ((x) & 0x3ffff)
122 #define VDCTRL2_GET_HSYNC_PERIOD(x) ((x) & 0x3ffff)
123
124 #define VDCTRL3_MUX_SYNC_SIGNALS (1 << 29)
125 #define VDCTRL3_VSYNC_ONLY (1 << 28)
126 #define SET_HOR_WAIT_CNT(x) (((x) & 0xfff) << 16)
127 #define GET_HOR_WAIT_CNT(x) (((x) >> 16) & 0xfff)
128 #define SET_VERT_WAIT_CNT(x) ((x) & 0xffff)
129 #define GET_VERT_WAIT_CNT(x) ((x) & 0xffff)
130
131 #define VDCTRL4_SET_DOTCLK_DLY(x) (((x) & 0x7) << 29) /* v4 only */
132 #define VDCTRL4_GET_DOTCLK_DLY(x) (((x) >> 29) & 0x7) /* v4 only */
133 #define VDCTRL4_SYNC_SIGNALS_ON (1 << 18)
134 #define SET_DOTCLK_H_VALID_DATA_CNT(x) ((x) & 0x3ffff)
135
136 #define DEBUG0_HSYNC (1 < 26)
137 #define DEBUG0_VSYNC (1 < 25)
138
139 #define MIN_XRES 120
140 #define MIN_YRES 120
141
142 #define RED 0
143 #define GREEN 1
144 #define BLUE 2
145 #define TRANSP 3
146
147 #define STMLCDIF_8BIT 1 /** pixel data bus to the display is of 8 bit width */
148 #define STMLCDIF_16BIT 0 /** pixel data bus to the display is of 16 bit width */
149 #define STMLCDIF_18BIT 2 /** pixel data bus to the display is of 18 bit width */
150 #define STMLCDIF_24BIT 3 /** pixel data bus to the display is of 24 bit width */
151
152 #define MXSFB_SYNC_DATA_ENABLE_HIGH_ACT (1 << 6)
153 #define MXSFB_SYNC_DOTCLK_FALLING_ACT (1 << 7) /* negtive edge sampling */
154
155 enum mxsfb_devtype {
156 MXSFB_V3,
157 MXSFB_V4,
158 };
159
160 /* CPU dependent register offsets */
161 struct mxsfb_devdata {
162 unsigned transfer_count;
163 unsigned cur_buf;
164 unsigned next_buf;
165 unsigned debug0;
166 unsigned hs_wdth_mask;
167 unsigned hs_wdth_shift;
168 unsigned ipversion;
169 };
170
171 struct mxsfb_info {
172 struct fb_info fb_info;
173 struct platform_device *pdev;
174 struct clk *clk;
175 struct clk *clk_axi;
176 struct clk *clk_disp_axi;
177 void __iomem *base; /* registers */
178 unsigned allocated_size;
179 int enabled;
180 unsigned ld_intf_width;
181 unsigned dotclk_delay;
182 const struct mxsfb_devdata *devdata;
183 u32 sync;
184 struct regulator *reg_lcd;
185 };
186
187 #define mxsfb_is_v3(host) (host->devdata->ipversion == 3)
188 #define mxsfb_is_v4(host) (host->devdata->ipversion == 4)
189
190 static const struct mxsfb_devdata mxsfb_devdata[] = {
191 [MXSFB_V3] = {
192 .transfer_count = LCDC_V3_TRANSFER_COUNT,
193 .cur_buf = LCDC_V3_CUR_BUF,
194 .next_buf = LCDC_V3_NEXT_BUF,
195 .debug0 = LCDC_V3_DEBUG0,
196 .hs_wdth_mask = 0xff,
197 .hs_wdth_shift = 24,
198 .ipversion = 3,
199 },
200 [MXSFB_V4] = {
201 .transfer_count = LCDC_V4_TRANSFER_COUNT,
202 .cur_buf = LCDC_V4_CUR_BUF,
203 .next_buf = LCDC_V4_NEXT_BUF,
204 .debug0 = LCDC_V4_DEBUG0,
205 .hs_wdth_mask = 0x3fff,
206 .hs_wdth_shift = 18,
207 .ipversion = 4,
208 },
209 };
210
211 #define to_imxfb_host(x) (container_of(x, struct mxsfb_info, fb_info))
212
213 /* mask and shift depends on architecture */
set_hsync_pulse_width(struct mxsfb_info * host,unsigned val)214 static inline u32 set_hsync_pulse_width(struct mxsfb_info *host, unsigned val)
215 {
216 return (val & host->devdata->hs_wdth_mask) <<
217 host->devdata->hs_wdth_shift;
218 }
219
get_hsync_pulse_width(struct mxsfb_info * host,unsigned val)220 static inline u32 get_hsync_pulse_width(struct mxsfb_info *host, unsigned val)
221 {
222 return (val >> host->devdata->hs_wdth_shift) &
223 host->devdata->hs_wdth_mask;
224 }
225
226 static const struct fb_bitfield def_rgb565[] = {
227 [RED] = {
228 .offset = 11,
229 .length = 5,
230 },
231 [GREEN] = {
232 .offset = 5,
233 .length = 6,
234 },
235 [BLUE] = {
236 .offset = 0,
237 .length = 5,
238 },
239 [TRANSP] = { /* no support for transparency */
240 .length = 0,
241 }
242 };
243
244 static const struct fb_bitfield def_rgb888[] = {
245 [RED] = {
246 .offset = 16,
247 .length = 8,
248 },
249 [GREEN] = {
250 .offset = 8,
251 .length = 8,
252 },
253 [BLUE] = {
254 .offset = 0,
255 .length = 8,
256 },
257 [TRANSP] = { /* no support for transparency */
258 .length = 0,
259 }
260 };
261
chan_to_field(unsigned chan,struct fb_bitfield * bf)262 static inline unsigned chan_to_field(unsigned chan, struct fb_bitfield *bf)
263 {
264 chan &= 0xffff;
265 chan >>= 16 - bf->length;
266 return chan << bf->offset;
267 }
268
mxsfb_check_var(struct fb_var_screeninfo * var,struct fb_info * fb_info)269 static int mxsfb_check_var(struct fb_var_screeninfo *var,
270 struct fb_info *fb_info)
271 {
272 struct mxsfb_info *host = to_imxfb_host(fb_info);
273 const struct fb_bitfield *rgb = NULL;
274
275 if (var->xres < MIN_XRES)
276 var->xres = MIN_XRES;
277 if (var->yres < MIN_YRES)
278 var->yres = MIN_YRES;
279
280 var->xres_virtual = var->xres;
281
282 var->yres_virtual = var->yres;
283
284 switch (var->bits_per_pixel) {
285 case 16:
286 /* always expect RGB 565 */
287 rgb = def_rgb565;
288 break;
289 case 32:
290 switch (host->ld_intf_width) {
291 case STMLCDIF_8BIT:
292 pr_debug("Unsupported LCD bus width mapping\n");
293 break;
294 case STMLCDIF_16BIT:
295 case STMLCDIF_18BIT:
296 case STMLCDIF_24BIT:
297 /* real 24 bit */
298 rgb = def_rgb888;
299 break;
300 }
301 break;
302 default:
303 pr_err("Unsupported colour depth: %u\n", var->bits_per_pixel);
304 return -EINVAL;
305 }
306
307 /*
308 * Copy the RGB parameters for this display
309 * from the machine specific parameters.
310 */
311 var->red = rgb[RED];
312 var->green = rgb[GREEN];
313 var->blue = rgb[BLUE];
314 var->transp = rgb[TRANSP];
315
316 return 0;
317 }
318
mxsfb_enable_axi_clk(struct mxsfb_info * host)319 static inline void mxsfb_enable_axi_clk(struct mxsfb_info *host)
320 {
321 if (host->clk_axi)
322 clk_prepare_enable(host->clk_axi);
323 }
324
mxsfb_disable_axi_clk(struct mxsfb_info * host)325 static inline void mxsfb_disable_axi_clk(struct mxsfb_info *host)
326 {
327 if (host->clk_axi)
328 clk_disable_unprepare(host->clk_axi);
329 }
330
mxsfb_enable_controller(struct fb_info * fb_info)331 static void mxsfb_enable_controller(struct fb_info *fb_info)
332 {
333 struct mxsfb_info *host = to_imxfb_host(fb_info);
334 u32 reg;
335 int ret;
336
337 dev_dbg(&host->pdev->dev, "%s\n", __func__);
338
339 if (host->reg_lcd) {
340 ret = regulator_enable(host->reg_lcd);
341 if (ret) {
342 dev_err(&host->pdev->dev,
343 "lcd regulator enable failed: %d\n", ret);
344 return;
345 }
346 }
347
348 if (host->clk_disp_axi)
349 clk_prepare_enable(host->clk_disp_axi);
350 clk_prepare_enable(host->clk);
351 clk_set_rate(host->clk, PICOS2KHZ(fb_info->var.pixclock) * 1000U);
352
353 mxsfb_enable_axi_clk(host);
354
355 /* if it was disabled, re-enable the mode again */
356 writel(CTRL_DOTCLK_MODE, host->base + LCDC_CTRL + REG_SET);
357
358 /* enable the SYNC signals first, then the DMA engine */
359 reg = readl(host->base + LCDC_VDCTRL4);
360 reg |= VDCTRL4_SYNC_SIGNALS_ON;
361 writel(reg, host->base + LCDC_VDCTRL4);
362
363 writel(CTRL_RUN, host->base + LCDC_CTRL + REG_SET);
364
365 host->enabled = 1;
366 }
367
mxsfb_disable_controller(struct fb_info * fb_info)368 static void mxsfb_disable_controller(struct fb_info *fb_info)
369 {
370 struct mxsfb_info *host = to_imxfb_host(fb_info);
371 unsigned loop;
372 u32 reg;
373 int ret;
374
375 dev_dbg(&host->pdev->dev, "%s\n", __func__);
376
377 /*
378 * Even if we disable the controller here, it will still continue
379 * until its FIFOs are running out of data
380 */
381 writel(CTRL_DOTCLK_MODE, host->base + LCDC_CTRL + REG_CLR);
382
383 loop = 1000;
384 while (loop) {
385 reg = readl(host->base + LCDC_CTRL);
386 if (!(reg & CTRL_RUN))
387 break;
388 loop--;
389 }
390
391 reg = readl(host->base + LCDC_VDCTRL4);
392 writel(reg & ~VDCTRL4_SYNC_SIGNALS_ON, host->base + LCDC_VDCTRL4);
393
394 mxsfb_disable_axi_clk(host);
395
396 clk_disable_unprepare(host->clk);
397 if (host->clk_disp_axi)
398 clk_disable_unprepare(host->clk_disp_axi);
399
400 host->enabled = 0;
401
402 if (host->reg_lcd) {
403 ret = regulator_disable(host->reg_lcd);
404 if (ret)
405 dev_err(&host->pdev->dev,
406 "lcd regulator disable failed: %d\n", ret);
407 }
408 }
409
mxsfb_set_par(struct fb_info * fb_info)410 static int mxsfb_set_par(struct fb_info *fb_info)
411 {
412 struct mxsfb_info *host = to_imxfb_host(fb_info);
413 u32 ctrl, vdctrl0, vdctrl4;
414 int line_size, fb_size;
415 int reenable = 0;
416
417 line_size = fb_info->var.xres * (fb_info->var.bits_per_pixel >> 3);
418 fb_size = fb_info->var.yres_virtual * line_size;
419
420 if (fb_size > fb_info->fix.smem_len)
421 return -ENOMEM;
422
423 fb_info->fix.line_length = line_size;
424
425 /*
426 * It seems, you can't re-program the controller if it is still running.
427 * This may lead into shifted pictures (FIFO issue?).
428 * So, first stop the controller and drain its FIFOs
429 */
430 if (host->enabled) {
431 reenable = 1;
432 mxsfb_disable_controller(fb_info);
433 }
434
435 mxsfb_enable_axi_clk(host);
436
437 /* clear the FIFOs */
438 writel(CTRL1_FIFO_CLEAR, host->base + LCDC_CTRL1 + REG_SET);
439
440 ctrl = CTRL_BYPASS_COUNT | CTRL_MASTER |
441 CTRL_SET_BUS_WIDTH(host->ld_intf_width);
442
443 switch (fb_info->var.bits_per_pixel) {
444 case 16:
445 dev_dbg(&host->pdev->dev, "Setting up RGB565 mode\n");
446 ctrl |= CTRL_SET_WORD_LENGTH(0);
447 writel(CTRL1_SET_BYTE_PACKAGING(0xf), host->base + LCDC_CTRL1);
448 break;
449 case 32:
450 dev_dbg(&host->pdev->dev, "Setting up RGB888/666 mode\n");
451 ctrl |= CTRL_SET_WORD_LENGTH(3);
452 switch (host->ld_intf_width) {
453 case STMLCDIF_8BIT:
454 mxsfb_disable_axi_clk(host);
455 dev_err(&host->pdev->dev,
456 "Unsupported LCD bus width mapping\n");
457 return -EINVAL;
458 case STMLCDIF_16BIT:
459 case STMLCDIF_18BIT:
460 case STMLCDIF_24BIT:
461 /* real 24 bit */
462 break;
463 }
464 /* do not use packed pixels = one pixel per word instead */
465 writel(CTRL1_SET_BYTE_PACKAGING(0x7), host->base + LCDC_CTRL1);
466 break;
467 default:
468 mxsfb_disable_axi_clk(host);
469 dev_err(&host->pdev->dev, "Unhandled color depth of %u\n",
470 fb_info->var.bits_per_pixel);
471 return -EINVAL;
472 }
473
474 writel(ctrl, host->base + LCDC_CTRL);
475
476 writel(TRANSFER_COUNT_SET_VCOUNT(fb_info->var.yres) |
477 TRANSFER_COUNT_SET_HCOUNT(fb_info->var.xres),
478 host->base + host->devdata->transfer_count);
479
480 vdctrl0 = VDCTRL0_ENABLE_PRESENT | /* always in DOTCLOCK mode */
481 VDCTRL0_VSYNC_PERIOD_UNIT |
482 VDCTRL0_VSYNC_PULSE_WIDTH_UNIT |
483 VDCTRL0_SET_VSYNC_PULSE_WIDTH(fb_info->var.vsync_len);
484 if (fb_info->var.sync & FB_SYNC_HOR_HIGH_ACT)
485 vdctrl0 |= VDCTRL0_HSYNC_ACT_HIGH;
486 if (fb_info->var.sync & FB_SYNC_VERT_HIGH_ACT)
487 vdctrl0 |= VDCTRL0_VSYNC_ACT_HIGH;
488 if (host->sync & MXSFB_SYNC_DATA_ENABLE_HIGH_ACT)
489 vdctrl0 |= VDCTRL0_ENABLE_ACT_HIGH;
490 if (host->sync & MXSFB_SYNC_DOTCLK_FALLING_ACT)
491 vdctrl0 |= VDCTRL0_DOTCLK_ACT_FALLING;
492
493 writel(vdctrl0, host->base + LCDC_VDCTRL0);
494
495 /* frame length in lines */
496 writel(fb_info->var.upper_margin + fb_info->var.vsync_len +
497 fb_info->var.lower_margin + fb_info->var.yres,
498 host->base + LCDC_VDCTRL1);
499
500 /* line length in units of clocks or pixels */
501 writel(set_hsync_pulse_width(host, fb_info->var.hsync_len) |
502 VDCTRL2_SET_HSYNC_PERIOD(fb_info->var.left_margin +
503 fb_info->var.hsync_len + fb_info->var.right_margin +
504 fb_info->var.xres),
505 host->base + LCDC_VDCTRL2);
506
507 writel(SET_HOR_WAIT_CNT(fb_info->var.left_margin +
508 fb_info->var.hsync_len) |
509 SET_VERT_WAIT_CNT(fb_info->var.upper_margin +
510 fb_info->var.vsync_len),
511 host->base + LCDC_VDCTRL3);
512
513 vdctrl4 = SET_DOTCLK_H_VALID_DATA_CNT(fb_info->var.xres);
514 if (mxsfb_is_v4(host))
515 vdctrl4 |= VDCTRL4_SET_DOTCLK_DLY(host->dotclk_delay);
516 writel(vdctrl4, host->base + LCDC_VDCTRL4);
517
518 writel(fb_info->fix.smem_start +
519 fb_info->fix.line_length * fb_info->var.yoffset,
520 host->base + host->devdata->next_buf);
521
522 mxsfb_disable_axi_clk(host);
523
524 if (reenable)
525 mxsfb_enable_controller(fb_info);
526
527 return 0;
528 }
529
mxsfb_setcolreg(u_int regno,u_int red,u_int green,u_int blue,u_int transp,struct fb_info * fb_info)530 static int mxsfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
531 u_int transp, struct fb_info *fb_info)
532 {
533 unsigned int val;
534 int ret = -EINVAL;
535
536 /*
537 * If greyscale is true, then we convert the RGB value
538 * to greyscale no matter what visual we are using.
539 */
540 if (fb_info->var.grayscale)
541 red = green = blue = (19595 * red + 38470 * green +
542 7471 * blue) >> 16;
543
544 switch (fb_info->fix.visual) {
545 case FB_VISUAL_TRUECOLOR:
546 /*
547 * 12 or 16-bit True Colour. We encode the RGB value
548 * according to the RGB bitfield information.
549 */
550 if (regno < 16) {
551 u32 *pal = fb_info->pseudo_palette;
552
553 val = chan_to_field(red, &fb_info->var.red);
554 val |= chan_to_field(green, &fb_info->var.green);
555 val |= chan_to_field(blue, &fb_info->var.blue);
556
557 pal[regno] = val;
558 ret = 0;
559 }
560 break;
561
562 case FB_VISUAL_STATIC_PSEUDOCOLOR:
563 case FB_VISUAL_PSEUDOCOLOR:
564 break;
565 }
566
567 return ret;
568 }
569
mxsfb_blank(int blank,struct fb_info * fb_info)570 static int mxsfb_blank(int blank, struct fb_info *fb_info)
571 {
572 struct mxsfb_info *host = to_imxfb_host(fb_info);
573
574 switch (blank) {
575 case FB_BLANK_POWERDOWN:
576 case FB_BLANK_VSYNC_SUSPEND:
577 case FB_BLANK_HSYNC_SUSPEND:
578 case FB_BLANK_NORMAL:
579 if (host->enabled)
580 mxsfb_disable_controller(fb_info);
581 break;
582
583 case FB_BLANK_UNBLANK:
584 if (!host->enabled)
585 mxsfb_enable_controller(fb_info);
586 break;
587 }
588 return 0;
589 }
590
mxsfb_pan_display(struct fb_var_screeninfo * var,struct fb_info * fb_info)591 static int mxsfb_pan_display(struct fb_var_screeninfo *var,
592 struct fb_info *fb_info)
593 {
594 struct mxsfb_info *host = to_imxfb_host(fb_info);
595 unsigned offset;
596
597 if (var->xoffset != 0)
598 return -EINVAL;
599
600 offset = fb_info->fix.line_length * var->yoffset;
601
602 mxsfb_enable_axi_clk(host);
603
604 /* update on next VSYNC */
605 writel(fb_info->fix.smem_start + offset,
606 host->base + host->devdata->next_buf);
607
608 mxsfb_disable_axi_clk(host);
609
610 return 0;
611 }
612
613 static struct fb_ops mxsfb_ops = {
614 .owner = THIS_MODULE,
615 .fb_check_var = mxsfb_check_var,
616 .fb_set_par = mxsfb_set_par,
617 .fb_setcolreg = mxsfb_setcolreg,
618 .fb_blank = mxsfb_blank,
619 .fb_pan_display = mxsfb_pan_display,
620 .fb_fillrect = cfb_fillrect,
621 .fb_copyarea = cfb_copyarea,
622 .fb_imageblit = cfb_imageblit,
623 };
624
mxsfb_restore_mode(struct mxsfb_info * host,struct fb_videomode * vmode)625 static int mxsfb_restore_mode(struct mxsfb_info *host,
626 struct fb_videomode *vmode)
627 {
628 struct fb_info *fb_info = &host->fb_info;
629 unsigned line_count;
630 unsigned period;
631 unsigned long pa, fbsize;
632 int bits_per_pixel, ofs, ret = 0;
633 u32 transfer_count, vdctrl0, vdctrl2, vdctrl3, vdctrl4, ctrl;
634
635 mxsfb_enable_axi_clk(host);
636
637 /* Only restore the mode when the controller is running */
638 ctrl = readl(host->base + LCDC_CTRL);
639 if (!(ctrl & CTRL_RUN)) {
640 ret = -EINVAL;
641 goto err;
642 }
643
644 vdctrl0 = readl(host->base + LCDC_VDCTRL0);
645 vdctrl2 = readl(host->base + LCDC_VDCTRL2);
646 vdctrl3 = readl(host->base + LCDC_VDCTRL3);
647 vdctrl4 = readl(host->base + LCDC_VDCTRL4);
648
649 transfer_count = readl(host->base + host->devdata->transfer_count);
650
651 vmode->xres = TRANSFER_COUNT_GET_HCOUNT(transfer_count);
652 vmode->yres = TRANSFER_COUNT_GET_VCOUNT(transfer_count);
653
654 switch (CTRL_GET_WORD_LENGTH(ctrl)) {
655 case 0:
656 bits_per_pixel = 16;
657 break;
658 case 3:
659 bits_per_pixel = 32;
660 break;
661 case 1:
662 default:
663 ret = -EINVAL;
664 goto err;
665 }
666
667 fb_info->var.bits_per_pixel = bits_per_pixel;
668
669 vmode->pixclock = KHZ2PICOS(clk_get_rate(host->clk) / 1000U);
670 vmode->hsync_len = get_hsync_pulse_width(host, vdctrl2);
671 vmode->left_margin = GET_HOR_WAIT_CNT(vdctrl3) - vmode->hsync_len;
672 vmode->right_margin = VDCTRL2_GET_HSYNC_PERIOD(vdctrl2) -
673 vmode->hsync_len - vmode->left_margin - vmode->xres;
674 vmode->vsync_len = VDCTRL0_GET_VSYNC_PULSE_WIDTH(vdctrl0);
675 period = readl(host->base + LCDC_VDCTRL1);
676 vmode->upper_margin = GET_VERT_WAIT_CNT(vdctrl3) - vmode->vsync_len;
677 vmode->lower_margin = period - vmode->vsync_len -
678 vmode->upper_margin - vmode->yres;
679
680 vmode->vmode = FB_VMODE_NONINTERLACED;
681
682 vmode->sync = 0;
683 if (vdctrl0 & VDCTRL0_HSYNC_ACT_HIGH)
684 vmode->sync |= FB_SYNC_HOR_HIGH_ACT;
685 if (vdctrl0 & VDCTRL0_VSYNC_ACT_HIGH)
686 vmode->sync |= FB_SYNC_VERT_HIGH_ACT;
687
688 pr_debug("Reconstructed video mode:\n");
689 pr_debug("%dx%d, hsync: %u left: %u, right: %u, vsync: %u, upper: %u, lower: %u\n",
690 vmode->xres, vmode->yres, vmode->hsync_len, vmode->left_margin,
691 vmode->right_margin, vmode->vsync_len, vmode->upper_margin,
692 vmode->lower_margin);
693 pr_debug("pixclk: %ldkHz\n", PICOS2KHZ(vmode->pixclock));
694
695 host->ld_intf_width = CTRL_GET_BUS_WIDTH(ctrl);
696 host->dotclk_delay = VDCTRL4_GET_DOTCLK_DLY(vdctrl4);
697
698 fb_info->fix.line_length = vmode->xres * (bits_per_pixel >> 3);
699
700 pa = readl(host->base + host->devdata->cur_buf);
701 fbsize = fb_info->fix.line_length * vmode->yres;
702 if (pa < fb_info->fix.smem_start) {
703 ret = -EINVAL;
704 goto err;
705 }
706 if (pa + fbsize > fb_info->fix.smem_start + fb_info->fix.smem_len) {
707 ret = -EINVAL;
708 goto err;
709 }
710 ofs = pa - fb_info->fix.smem_start;
711 if (ofs) {
712 memmove(fb_info->screen_base, fb_info->screen_base + ofs, fbsize);
713 writel(fb_info->fix.smem_start, host->base + host->devdata->next_buf);
714 }
715
716 line_count = fb_info->fix.smem_len / fb_info->fix.line_length;
717 fb_info->fix.ypanstep = 1;
718
719 clk_prepare_enable(host->clk);
720 host->enabled = 1;
721
722 err:
723 if (ret)
724 mxsfb_disable_axi_clk(host);
725
726 return ret;
727 }
728
mxsfb_init_fbinfo_dt(struct mxsfb_info * host,struct fb_videomode * vmode)729 static int mxsfb_init_fbinfo_dt(struct mxsfb_info *host,
730 struct fb_videomode *vmode)
731 {
732 struct fb_info *fb_info = &host->fb_info;
733 struct fb_var_screeninfo *var = &fb_info->var;
734 struct device *dev = &host->pdev->dev;
735 struct device_node *np = host->pdev->dev.of_node;
736 struct device_node *display_np;
737 struct videomode vm;
738 u32 width;
739 int ret;
740
741 display_np = of_parse_phandle(np, "display", 0);
742 if (!display_np) {
743 dev_err(dev, "failed to find display phandle\n");
744 return -ENOENT;
745 }
746
747 ret = of_property_read_u32(display_np, "bus-width", &width);
748 if (ret < 0) {
749 dev_err(dev, "failed to get property bus-width\n");
750 goto put_display_node;
751 }
752
753 switch (width) {
754 case 8:
755 host->ld_intf_width = STMLCDIF_8BIT;
756 break;
757 case 16:
758 host->ld_intf_width = STMLCDIF_16BIT;
759 break;
760 case 18:
761 host->ld_intf_width = STMLCDIF_18BIT;
762 break;
763 case 24:
764 host->ld_intf_width = STMLCDIF_24BIT;
765 break;
766 default:
767 dev_err(dev, "invalid bus-width value\n");
768 ret = -EINVAL;
769 goto put_display_node;
770 }
771
772 ret = of_property_read_u32(display_np, "bits-per-pixel",
773 &var->bits_per_pixel);
774 if (ret < 0) {
775 dev_err(dev, "failed to get property bits-per-pixel\n");
776 goto put_display_node;
777 }
778
779 ret = of_get_videomode(display_np, &vm, OF_USE_NATIVE_MODE);
780 if (ret) {
781 dev_err(dev, "failed to get videomode from DT\n");
782 goto put_display_node;
783 }
784
785 ret = fb_videomode_from_videomode(&vm, vmode);
786 if (ret < 0)
787 goto put_display_node;
788
789 if (vm.flags & DISPLAY_FLAGS_DE_HIGH)
790 host->sync |= MXSFB_SYNC_DATA_ENABLE_HIGH_ACT;
791 if (vm.flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
792 host->sync |= MXSFB_SYNC_DOTCLK_FALLING_ACT;
793
794 put_display_node:
795 of_node_put(display_np);
796 return ret;
797 }
798
mxsfb_init_fbinfo(struct mxsfb_info * host,struct fb_videomode * vmode)799 static int mxsfb_init_fbinfo(struct mxsfb_info *host,
800 struct fb_videomode *vmode)
801 {
802 int ret;
803 struct device *dev = &host->pdev->dev;
804 struct fb_info *fb_info = &host->fb_info;
805 struct fb_var_screeninfo *var = &fb_info->var;
806 dma_addr_t fb_phys;
807 void *fb_virt;
808 unsigned fb_size;
809
810 fb_info->fbops = &mxsfb_ops;
811 fb_info->flags = FBINFO_FLAG_DEFAULT | FBINFO_READS_FAST;
812 strlcpy(fb_info->fix.id, "mxs", sizeof(fb_info->fix.id));
813 fb_info->fix.type = FB_TYPE_PACKED_PIXELS;
814 fb_info->fix.ypanstep = 1;
815 fb_info->fix.visual = FB_VISUAL_TRUECOLOR,
816 fb_info->fix.accel = FB_ACCEL_NONE;
817
818 ret = mxsfb_init_fbinfo_dt(host, vmode);
819 if (ret)
820 return ret;
821
822 var->nonstd = 0;
823 var->activate = FB_ACTIVATE_NOW;
824 var->accel_flags = 0;
825 var->vmode = FB_VMODE_NONINTERLACED;
826
827 /* Memory allocation for framebuffer */
828 fb_size = SZ_2M;
829 fb_virt = dma_alloc_wc(dev, PAGE_ALIGN(fb_size), &fb_phys, GFP_KERNEL);
830 if (!fb_virt)
831 return -ENOMEM;
832
833 fb_info->fix.smem_start = fb_phys;
834 fb_info->screen_base = fb_virt;
835 fb_info->screen_size = fb_info->fix.smem_len = fb_size;
836
837 if (mxsfb_restore_mode(host, vmode))
838 memset(fb_virt, 0, fb_size);
839
840 return 0;
841 }
842
mxsfb_free_videomem(struct mxsfb_info * host)843 static void mxsfb_free_videomem(struct mxsfb_info *host)
844 {
845 struct device *dev = &host->pdev->dev;
846 struct fb_info *fb_info = &host->fb_info;
847
848 dma_free_wc(dev, fb_info->screen_size, fb_info->screen_base,
849 fb_info->fix.smem_start);
850 }
851
852 static const struct platform_device_id mxsfb_devtype[] = {
853 {
854 .name = "imx23-fb",
855 .driver_data = MXSFB_V3,
856 }, {
857 .name = "imx28-fb",
858 .driver_data = MXSFB_V4,
859 }, {
860 /* sentinel */
861 }
862 };
863 MODULE_DEVICE_TABLE(platform, mxsfb_devtype);
864
865 static const struct of_device_id mxsfb_dt_ids[] = {
866 { .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devtype[0], },
867 { .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devtype[1], },
868 { /* sentinel */ }
869 };
870 MODULE_DEVICE_TABLE(of, mxsfb_dt_ids);
871
mxsfb_probe(struct platform_device * pdev)872 static int mxsfb_probe(struct platform_device *pdev)
873 {
874 const struct of_device_id *of_id =
875 of_match_device(mxsfb_dt_ids, &pdev->dev);
876 struct resource *res;
877 struct mxsfb_info *host;
878 struct fb_info *fb_info;
879 struct fb_videomode *mode;
880 int ret;
881
882 if (of_id)
883 pdev->id_entry = of_id->data;
884
885 fb_info = framebuffer_alloc(sizeof(struct mxsfb_info), &pdev->dev);
886 if (!fb_info) {
887 dev_err(&pdev->dev, "Failed to allocate fbdev\n");
888 return -ENOMEM;
889 }
890
891 mode = devm_kzalloc(&pdev->dev, sizeof(struct fb_videomode),
892 GFP_KERNEL);
893 if (mode == NULL)
894 return -ENOMEM;
895
896 host = to_imxfb_host(fb_info);
897
898 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
899 host->base = devm_ioremap_resource(&pdev->dev, res);
900 if (IS_ERR(host->base)) {
901 ret = PTR_ERR(host->base);
902 goto fb_release;
903 }
904
905 host->pdev = pdev;
906 platform_set_drvdata(pdev, host);
907
908 host->devdata = &mxsfb_devdata[pdev->id_entry->driver_data];
909
910 host->clk = devm_clk_get(&host->pdev->dev, NULL);
911 if (IS_ERR(host->clk)) {
912 ret = PTR_ERR(host->clk);
913 goto fb_release;
914 }
915
916 host->clk_axi = devm_clk_get(&host->pdev->dev, "axi");
917 if (IS_ERR(host->clk_axi))
918 host->clk_axi = NULL;
919
920 host->clk_disp_axi = devm_clk_get(&host->pdev->dev, "disp_axi");
921 if (IS_ERR(host->clk_disp_axi))
922 host->clk_disp_axi = NULL;
923
924 host->reg_lcd = devm_regulator_get(&pdev->dev, "lcd");
925 if (IS_ERR(host->reg_lcd))
926 host->reg_lcd = NULL;
927
928 fb_info->pseudo_palette = devm_kzalloc(&pdev->dev, sizeof(u32) * 16,
929 GFP_KERNEL);
930 if (!fb_info->pseudo_palette) {
931 ret = -ENOMEM;
932 goto fb_release;
933 }
934
935 ret = mxsfb_init_fbinfo(host, mode);
936 if (ret != 0)
937 goto fb_release;
938
939 fb_videomode_to_var(&fb_info->var, mode);
940
941 /* init the color fields */
942 mxsfb_check_var(&fb_info->var, fb_info);
943
944 platform_set_drvdata(pdev, fb_info);
945
946 ret = register_framebuffer(fb_info);
947 if (ret != 0) {
948 dev_err(&pdev->dev,"Failed to register framebuffer\n");
949 goto fb_destroy;
950 }
951
952 if (!host->enabled) {
953 mxsfb_enable_axi_clk(host);
954 writel(0, host->base + LCDC_CTRL);
955 mxsfb_disable_axi_clk(host);
956 mxsfb_set_par(fb_info);
957 mxsfb_enable_controller(fb_info);
958 }
959
960 dev_info(&pdev->dev, "initialized\n");
961
962 return 0;
963
964 fb_destroy:
965 if (host->enabled)
966 clk_disable_unprepare(host->clk);
967 fb_release:
968 framebuffer_release(fb_info);
969
970 return ret;
971 }
972
mxsfb_remove(struct platform_device * pdev)973 static int mxsfb_remove(struct platform_device *pdev)
974 {
975 struct fb_info *fb_info = platform_get_drvdata(pdev);
976 struct mxsfb_info *host = to_imxfb_host(fb_info);
977
978 if (host->enabled)
979 mxsfb_disable_controller(fb_info);
980
981 unregister_framebuffer(fb_info);
982 mxsfb_free_videomem(host);
983
984 framebuffer_release(fb_info);
985
986 return 0;
987 }
988
mxsfb_shutdown(struct platform_device * pdev)989 static void mxsfb_shutdown(struct platform_device *pdev)
990 {
991 struct fb_info *fb_info = platform_get_drvdata(pdev);
992 struct mxsfb_info *host = to_imxfb_host(fb_info);
993
994 mxsfb_enable_axi_clk(host);
995
996 /*
997 * Force stop the LCD controller as keeping it running during reboot
998 * might interfere with the BootROM's boot mode pads sampling.
999 */
1000 writel(CTRL_RUN, host->base + LCDC_CTRL + REG_CLR);
1001
1002 mxsfb_disable_axi_clk(host);
1003 }
1004
1005 static struct platform_driver mxsfb_driver = {
1006 .probe = mxsfb_probe,
1007 .remove = mxsfb_remove,
1008 .shutdown = mxsfb_shutdown,
1009 .id_table = mxsfb_devtype,
1010 .driver = {
1011 .name = DRIVER_NAME,
1012 .of_match_table = mxsfb_dt_ids,
1013 },
1014 };
1015
1016 module_platform_driver(mxsfb_driver);
1017
1018 MODULE_DESCRIPTION("Freescale mxs framebuffer driver");
1019 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
1020 MODULE_LICENSE("GPL");
1021