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Linux 3.11-rc3
[cris-mirror.git] / drivers / video / imxfb.c
blob38733ac2b6981682cd318f16f17d2784f64d9962
1 /*
2 * Freescale i.MX Frame Buffer device driver
3 *
4 * Copyright (C) 2004 Sascha Hauer, Pengutronix
5 * Based on acornfb.c Copyright (C) Russell King.
6 *
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License. See the file COPYING in the main directory of this archive for
9 * more details.
10 *
11 * Please direct your questions and comments on this driver to the following
12 * email address:
13 *
14 * linux-arm-kernel@lists.arm.linux.org.uk
15 */
16
17 #include <linux/module.h>
18 #include <linux/kernel.h>
19 #include <linux/errno.h>
20 #include <linux/string.h>
21 #include <linux/interrupt.h>
22 #include <linux/slab.h>
23 #include <linux/mm.h>
24 #include <linux/fb.h>
25 #include <linux/delay.h>
26 #include <linux/init.h>
27 #include <linux/ioport.h>
28 #include <linux/cpufreq.h>
29 #include <linux/clk.h>
30 #include <linux/platform_device.h>
31 #include <linux/dma-mapping.h>
32 #include <linux/io.h>
33 #include <linux/math64.h>
34 #include <linux/of.h>
35 #include <linux/of_device.h>
36
37 #include <video/of_display_timing.h>
38 #include <video/of_videomode.h>
39 #include <video/videomode.h>
40
41 #include <linux/platform_data/video-imxfb.h>
42
43 /*
44 * Complain if VAR is out of range.
45 */
46 #define DEBUG_VAR 1
47
48 #if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || \
49 (defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE) && \
50 defined(CONFIG_FB_IMX_MODULE))
51 #define PWMR_BACKLIGHT_AVAILABLE
52 #endif
53
54 #define DRIVER_NAME "imx-fb"
55
56 #define LCDC_SSA 0x00
57
58 #define LCDC_SIZE 0x04
59 #define SIZE_XMAX(x) ((((x) >> 4) & 0x3f) << 20)
60
61 #define YMAX_MASK_IMX1 0x1ff
62 #define YMAX_MASK_IMX21 0x3ff
63
64 #define LCDC_VPW 0x08
65 #define VPW_VPW(x) ((x) & 0x3ff)
66
67 #define LCDC_CPOS 0x0C
68 #define CPOS_CC1 (1<<31)
69 #define CPOS_CC0 (1<<30)
70 #define CPOS_OP (1<<28)
71 #define CPOS_CXP(x) (((x) & 3ff) << 16)
72
73 #define LCDC_LCWHB 0x10
74 #define LCWHB_BK_EN (1<<31)
75 #define LCWHB_CW(w) (((w) & 0x1f) << 24)
76 #define LCWHB_CH(h) (((h) & 0x1f) << 16)
77 #define LCWHB_BD(x) ((x) & 0xff)
78
79 #define LCDC_LCHCC 0x14
80
81 #define LCDC_PCR 0x18
82
83 #define LCDC_HCR 0x1C
84 #define HCR_H_WIDTH(x) (((x) & 0x3f) << 26)
85 #define HCR_H_WAIT_1(x) (((x) & 0xff) << 8)
86 #define HCR_H_WAIT_2(x) ((x) & 0xff)
87
88 #define LCDC_VCR 0x20
89 #define VCR_V_WIDTH(x) (((x) & 0x3f) << 26)
90 #define VCR_V_WAIT_1(x) (((x) & 0xff) << 8)
91 #define VCR_V_WAIT_2(x) ((x) & 0xff)
92
93 #define LCDC_POS 0x24
94 #define POS_POS(x) ((x) & 1f)
95
96 #define LCDC_LSCR1 0x28
97 /* bit fields in imxfb.h */
98
99 #define LCDC_PWMR 0x2C
100 /* bit fields in imxfb.h */
101
102 #define LCDC_DMACR 0x30
103 /* bit fields in imxfb.h */
104
105 #define LCDC_RMCR 0x34
106
107 #define RMCR_LCDC_EN_MX1 (1<<1)
108
109 #define RMCR_SELF_REF (1<<0)
110
111 #define LCDC_LCDICR 0x38
112 #define LCDICR_INT_SYN (1<<2)
113 #define LCDICR_INT_CON (1)
114
115 #define LCDC_LCDISR 0x40
116 #define LCDISR_UDR_ERR (1<<3)
117 #define LCDISR_ERR_RES (1<<2)
118 #define LCDISR_EOF (1<<1)
119 #define LCDISR_BOF (1<<0)
120
121 #define IMXFB_LSCR1_DEFAULT 0x00120300
122
123 /* Used fb-mode. Can be set on kernel command line, therefore file-static. */
124 static const char *fb_mode;
125
126 /*
127 * These are the bitfields for each
128 * display depth that we support.
129 */
130 struct imxfb_rgb {
131 struct fb_bitfield red;
132 struct fb_bitfield green;
133 struct fb_bitfield blue;
134 struct fb_bitfield transp;
135 };
136
137 enum imxfb_type {
138 IMX1_FB,
139 IMX21_FB,
140 };
141
142 struct imxfb_info {
143 struct platform_device *pdev;
144 void __iomem *regs;
145 struct clk *clk_ipg;
146 struct clk *clk_ahb;
147 struct clk *clk_per;
148 enum imxfb_type devtype;
149 bool enabled;
150
151 /*
152 * These are the addresses we mapped
153 * the framebuffer memory region to.
154 */
155 dma_addr_t map_dma;
156 u_char *map_cpu;
157 u_int map_size;
158
159 u_char *screen_cpu;
160 dma_addr_t screen_dma;
161 u_int palette_size;
162
163 dma_addr_t dbar1;
164 dma_addr_t dbar2;
165
166 u_int pcr;
167 u_int pwmr;
168 u_int lscr1;
169 u_int dmacr;
170 u_int cmap_inverse:1,
171 cmap_static:1,
172 unused:30;
173
174 struct imx_fb_videomode *mode;
175 int num_modes;
176 #ifdef PWMR_BACKLIGHT_AVAILABLE
177 struct backlight_device *bl;
178 #endif
179
180 void (*lcd_power)(int);
181 void (*backlight_power)(int);
182 };
183
184 static struct platform_device_id imxfb_devtype[] = {
185 {
186 .name = "imx1-fb",
187 .driver_data = IMX1_FB,
188 }, {
189 .name = "imx21-fb",
190 .driver_data = IMX21_FB,
191 }, {
192 /* sentinel */
193 }
194 };
195 MODULE_DEVICE_TABLE(platform, imxfb_devtype);
196
197 static struct of_device_id imxfb_of_dev_id[] = {
198 {
199 .compatible = "fsl,imx1-fb",
200 .data = &imxfb_devtype[IMX1_FB],
201 }, {
202 .compatible = "fsl,imx21-fb",
203 .data = &imxfb_devtype[IMX21_FB],
204 }, {
205 /* sentinel */
206 }
207 };
208 MODULE_DEVICE_TABLE(of, imxfb_of_dev_id);
209
210 static inline int is_imx1_fb(struct imxfb_info *fbi)
211 {
212 return fbi->devtype == IMX1_FB;
213 }
214
215 #define IMX_NAME "IMX"
216
217 /*
218 * Minimum X and Y resolutions
219 */
220 #define MIN_XRES 64
221 #define MIN_YRES 64
222
223 /* Actually this really is 18bit support, the lowest 2 bits of each colour
224 * are unused in hardware. We claim to have 24bit support to make software
225 * like X work, which does not support 18bit.
226 */
227 static struct imxfb_rgb def_rgb_18 = {
228 .red = {.offset = 16, .length = 8,},
229 .green = {.offset = 8, .length = 8,},
230 .blue = {.offset = 0, .length = 8,},
231 .transp = {.offset = 0, .length = 0,},
232 };
233
234 static struct imxfb_rgb def_rgb_16_tft = {
235 .red = {.offset = 11, .length = 5,},
236 .green = {.offset = 5, .length = 6,},
237 .blue = {.offset = 0, .length = 5,},
238 .transp = {.offset = 0, .length = 0,},
239 };
240
241 static struct imxfb_rgb def_rgb_16_stn = {
242 .red = {.offset = 8, .length = 4,},
243 .green = {.offset = 4, .length = 4,},
244 .blue = {.offset = 0, .length = 4,},
245 .transp = {.offset = 0, .length = 0,},
246 };
247
248 static struct imxfb_rgb def_rgb_8 = {
249 .red = {.offset = 0, .length = 8,},
250 .green = {.offset = 0, .length = 8,},
251 .blue = {.offset = 0, .length = 8,},
252 .transp = {.offset = 0, .length = 0,},
253 };
254
255 static int imxfb_activate_var(struct fb_var_screeninfo *var,
256 struct fb_info *info);
257
258 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
259 {
260 chan &= 0xffff;
261 chan >>= 16 - bf->length;
262 return chan << bf->offset;
263 }
264
265 static int imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
266 u_int trans, struct fb_info *info)
267 {
268 struct imxfb_info *fbi = info->par;
269 u_int val, ret = 1;
270
271 #define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
272 if (regno < fbi->palette_size) {
273 val = (CNVT_TOHW(red, 4) << 8) |
274 (CNVT_TOHW(green,4) << 4) |
275 CNVT_TOHW(blue, 4);
276
277 writel(val, fbi->regs + 0x800 + (regno << 2));
278 ret = 0;
279 }
280 return ret;
281 }
282
283 static int imxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
284 u_int trans, struct fb_info *info)
285 {
286 struct imxfb_info *fbi = info->par;
287 unsigned int val;
288 int ret = 1;
289
290 /*
291 * If inverse mode was selected, invert all the colours
292 * rather than the register number. The register number
293 * is what you poke into the framebuffer to produce the
294 * colour you requested.
295 */
296 if (fbi->cmap_inverse) {
297 red = 0xffff - red;
298 green = 0xffff - green;
299 blue = 0xffff - blue;
300 }
301
302 /*
303 * If greyscale is true, then we convert the RGB value
304 * to greyscale no mater what visual we are using.
305 */
306 if (info->var.grayscale)
307 red = green = blue = (19595 * red + 38470 * green +
308 7471 * blue) >> 16;
309
310 switch (info->fix.visual) {
311 case FB_VISUAL_TRUECOLOR:
312 /*
313 * 12 or 16-bit True Colour. We encode the RGB value
314 * according to the RGB bitfield information.
315 */
316 if (regno < 16) {
317 u32 *pal = info->pseudo_palette;
318
319 val = chan_to_field(red, &info->var.red);
320 val |= chan_to_field(green, &info->var.green);
321 val |= chan_to_field(blue, &info->var.blue);
322
323 pal[regno] = val;
324 ret = 0;
325 }
326 break;
327
328 case FB_VISUAL_STATIC_PSEUDOCOLOR:
329 case FB_VISUAL_PSEUDOCOLOR:
330 ret = imxfb_setpalettereg(regno, red, green, blue, trans, info);
331 break;
332 }
333
334 return ret;
335 }
336
337 static const struct imx_fb_videomode *imxfb_find_mode(struct imxfb_info *fbi)
338 {
339 struct imx_fb_videomode *m;
340 int i;
341
342 if (!fb_mode)
343 return &fbi->mode[0];
344
345 for (i = 0, m = &fbi->mode[0]; i < fbi->num_modes; i++, m++) {
346 if (!strcmp(m->mode.name, fb_mode))
347 return m;
348 }
349 return NULL;
350 }
351
352 /*
353 * imxfb_check_var():
354 * Round up in the following order: bits_per_pixel, xres,
355 * yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
356 * bitfields, horizontal timing, vertical timing.
357 */
358 static int imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
359 {
360 struct imxfb_info *fbi = info->par;
361 struct imxfb_rgb *rgb;
362 const struct imx_fb_videomode *imxfb_mode;
363 unsigned long lcd_clk;
364 unsigned long long tmp;
365 u32 pcr = 0;
366
367 if (var->xres < MIN_XRES)
368 var->xres = MIN_XRES;
369 if (var->yres < MIN_YRES)
370 var->yres = MIN_YRES;
371
372 imxfb_mode = imxfb_find_mode(fbi);
373 if (!imxfb_mode)
374 return -EINVAL;
375
376 var->xres = imxfb_mode->mode.xres;
377 var->yres = imxfb_mode->mode.yres;
378 var->bits_per_pixel = imxfb_mode->bpp;
379 var->pixclock = imxfb_mode->mode.pixclock;
380 var->hsync_len = imxfb_mode->mode.hsync_len;
381 var->left_margin = imxfb_mode->mode.left_margin;
382 var->right_margin = imxfb_mode->mode.right_margin;
383 var->vsync_len = imxfb_mode->mode.vsync_len;
384 var->upper_margin = imxfb_mode->mode.upper_margin;
385 var->lower_margin = imxfb_mode->mode.lower_margin;
386 var->sync = imxfb_mode->mode.sync;
387 var->xres_virtual = max(var->xres_virtual, var->xres);
388 var->yres_virtual = max(var->yres_virtual, var->yres);
389
390 pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel);
391
392 lcd_clk = clk_get_rate(fbi->clk_per);
393
394 tmp = var->pixclock * (unsigned long long)lcd_clk;
395
396 do_div(tmp, 1000000);
397
398 if (do_div(tmp, 1000000) > 500000)
399 tmp++;
400
401 pcr = (unsigned int)tmp;
402
403 if (--pcr > 0x3F) {
404 pcr = 0x3F;
405 printk(KERN_WARNING "Must limit pixel clock to %luHz\n",
406 lcd_clk / pcr);
407 }
408
409 switch (var->bits_per_pixel) {
410 case 32:
411 pcr |= PCR_BPIX_18;
412 rgb = &def_rgb_18;
413 break;
414 case 16:
415 default:
416 if (is_imx1_fb(fbi))
417 pcr |= PCR_BPIX_12;
418 else
419 pcr |= PCR_BPIX_16;
420
421 if (imxfb_mode->pcr & PCR_TFT)
422 rgb = &def_rgb_16_tft;
423 else
424 rgb = &def_rgb_16_stn;
425 break;
426 case 8:
427 pcr |= PCR_BPIX_8;
428 rgb = &def_rgb_8;
429 break;
430 }
431
432 /* add sync polarities */
433 pcr |= imxfb_mode->pcr & ~(0x3f | (7 << 25));
434
435 fbi->pcr = pcr;
436
437 /*
438 * Copy the RGB parameters for this display
439 * from the machine specific parameters.
440 */
441 var->red = rgb->red;
442 var->green = rgb->green;
443 var->blue = rgb->blue;
444 var->transp = rgb->transp;
445
446 pr_debug("RGBT length = %d:%d:%d:%d\n",
447 var->red.length, var->green.length, var->blue.length,
448 var->transp.length);
449
450 pr_debug("RGBT offset = %d:%d:%d:%d\n",
451 var->red.offset, var->green.offset, var->blue.offset,
452 var->transp.offset);
453
454 return 0;
455 }
456
457 /*
458 * imxfb_set_par():
459 * Set the user defined part of the display for the specified console
460 */
461 static int imxfb_set_par(struct fb_info *info)
462 {
463 struct imxfb_info *fbi = info->par;
464 struct fb_var_screeninfo *var = &info->var;
465
466 if (var->bits_per_pixel == 16 || var->bits_per_pixel == 32)
467 info->fix.visual = FB_VISUAL_TRUECOLOR;
468 else if (!fbi->cmap_static)
469 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
470 else {
471 /*
472 * Some people have weird ideas about wanting static
473 * pseudocolor maps. I suspect their user space
474 * applications are broken.
475 */
476 info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
477 }
478
479 info->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8;
480 fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16;
481
482 imxfb_activate_var(var, info);
483
484 return 0;
485 }
486
487 #ifdef PWMR_BACKLIGHT_AVAILABLE
488 static int imxfb_bl_get_brightness(struct backlight_device *bl)
489 {
490 struct imxfb_info *fbi = bl_get_data(bl);
491
492 return readl(fbi->regs + LCDC_PWMR) & 0xFF;
493 }
494
495 static int imxfb_bl_update_status(struct backlight_device *bl)
496 {
497 struct imxfb_info *fbi = bl_get_data(bl);
498 int brightness = bl->props.brightness;
499
500 if (!fbi->pwmr)
501 return 0;
502
503 if (bl->props.power != FB_BLANK_UNBLANK)
504 brightness = 0;
505 if (bl->props.fb_blank != FB_BLANK_UNBLANK)
506 brightness = 0;
507
508 fbi->pwmr = (fbi->pwmr & ~0xFF) | brightness;
509
510 if (bl->props.fb_blank != FB_BLANK_UNBLANK) {
511 clk_prepare_enable(fbi->clk_ipg);
512 clk_prepare_enable(fbi->clk_ahb);
513 clk_prepare_enable(fbi->clk_per);
514 }
515 writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
516 if (bl->props.fb_blank != FB_BLANK_UNBLANK) {
517 clk_disable_unprepare(fbi->clk_per);
518 clk_disable_unprepare(fbi->clk_ahb);
519 clk_disable_unprepare(fbi->clk_ipg);
520 }
521
522 return 0;
523 }
524
525 static const struct backlight_ops imxfb_lcdc_bl_ops = {
526 .update_status = imxfb_bl_update_status,
527 .get_brightness = imxfb_bl_get_brightness,
528 };
529
530 static void imxfb_init_backlight(struct imxfb_info *fbi)
531 {
532 struct backlight_properties props;
533 struct backlight_device *bl;
534
535 if (fbi->bl)
536 return;
537
538 memset(&props, 0, sizeof(struct backlight_properties));
539 props.max_brightness = 0xff;
540 props.type = BACKLIGHT_RAW;
541 writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
542
543 bl = backlight_device_register("imxfb-bl", &fbi->pdev->dev, fbi,
544 &imxfb_lcdc_bl_ops, &props);
545 if (IS_ERR(bl)) {
546 dev_err(&fbi->pdev->dev, "error %ld on backlight register\n",
547 PTR_ERR(bl));
548 return;
549 }
550
551 fbi->bl = bl;
552 bl->props.power = FB_BLANK_UNBLANK;
553 bl->props.fb_blank = FB_BLANK_UNBLANK;
554 bl->props.brightness = imxfb_bl_get_brightness(bl);
555 }
556
557 static void imxfb_exit_backlight(struct imxfb_info *fbi)
558 {
559 if (fbi->bl)
560 backlight_device_unregister(fbi->bl);
561 }
562 #endif
563
564 static void imxfb_enable_controller(struct imxfb_info *fbi)
565 {
566
567 if (fbi->enabled)
568 return;
569
570 pr_debug("Enabling LCD controller\n");
571
572 writel(fbi->screen_dma, fbi->regs + LCDC_SSA);
573
574 /* panning offset 0 (0 pixel offset) */
575 writel(0x00000000, fbi->regs + LCDC_POS);
576
577 /* disable hardware cursor */
578 writel(readl(fbi->regs + LCDC_CPOS) & ~(CPOS_CC0 | CPOS_CC1),
579 fbi->regs + LCDC_CPOS);
580
581 /*
582 * RMCR_LCDC_EN_MX1 is present on i.MX1 only, but doesn't hurt
583 * on other SoCs
584 */
585 writel(RMCR_LCDC_EN_MX1, fbi->regs + LCDC_RMCR);
586
587 clk_prepare_enable(fbi->clk_ipg);
588 clk_prepare_enable(fbi->clk_ahb);
589 clk_prepare_enable(fbi->clk_per);
590 fbi->enabled = true;
591
592 if (fbi->backlight_power)
593 fbi->backlight_power(1);
594 if (fbi->lcd_power)
595 fbi->lcd_power(1);
596 }
597
598 static void imxfb_disable_controller(struct imxfb_info *fbi)
599 {
600 if (!fbi->enabled)
601 return;
602
603 pr_debug("Disabling LCD controller\n");
604
605 if (fbi->backlight_power)
606 fbi->backlight_power(0);
607 if (fbi->lcd_power)
608 fbi->lcd_power(0);
609
610 clk_disable_unprepare(fbi->clk_per);
611 clk_disable_unprepare(fbi->clk_ipg);
612 clk_disable_unprepare(fbi->clk_ahb);
613 fbi->enabled = false;
614
615 writel(0, fbi->regs + LCDC_RMCR);
616 }
617
618 static int imxfb_blank(int blank, struct fb_info *info)
619 {
620 struct imxfb_info *fbi = info->par;
621
622 pr_debug("imxfb_blank: blank=%d\n", blank);
623
624 switch (blank) {
625 case FB_BLANK_POWERDOWN:
626 case FB_BLANK_VSYNC_SUSPEND:
627 case FB_BLANK_HSYNC_SUSPEND:
628 case FB_BLANK_NORMAL:
629 imxfb_disable_controller(fbi);
630 break;
631
632 case FB_BLANK_UNBLANK:
633 imxfb_enable_controller(fbi);
634 break;
635 }
636 return 0;
637 }
638
639 static struct fb_ops imxfb_ops = {
640 .owner = THIS_MODULE,
641 .fb_check_var = imxfb_check_var,
642 .fb_set_par = imxfb_set_par,
643 .fb_setcolreg = imxfb_setcolreg,
644 .fb_fillrect = cfb_fillrect,
645 .fb_copyarea = cfb_copyarea,
646 .fb_imageblit = cfb_imageblit,
647 .fb_blank = imxfb_blank,
648 };
649
650 /*
651 * imxfb_activate_var():
652 * Configures LCD Controller based on entries in var parameter. Settings are
653 * only written to the controller if changes were made.
654 */
655 static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info)
656 {
657 struct imxfb_info *fbi = info->par;
658 u32 ymax_mask = is_imx1_fb(fbi) ? YMAX_MASK_IMX1 : YMAX_MASK_IMX21;
659
660 pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",
661 var->xres, var->hsync_len,
662 var->left_margin, var->right_margin);
663 pr_debug("var: yres=%d vslen=%d um=%d bm=%d\n",
664 var->yres, var->vsync_len,
665 var->upper_margin, var->lower_margin);
666
667 #if DEBUG_VAR
668 if (var->xres < 16 || var->xres > 1024)
669 printk(KERN_ERR "%s: invalid xres %d\n",
670 info->fix.id, var->xres);
671 if (var->hsync_len < 1 || var->hsync_len > 64)
672 printk(KERN_ERR "%s: invalid hsync_len %d\n",
673 info->fix.id, var->hsync_len);
674 if (var->left_margin > 255)
675 printk(KERN_ERR "%s: invalid left_margin %d\n",
676 info->fix.id, var->left_margin);
677 if (var->right_margin > 255)
678 printk(KERN_ERR "%s: invalid right_margin %d\n",
679 info->fix.id, var->right_margin);
680 if (var->yres < 1 || var->yres > ymax_mask)
681 printk(KERN_ERR "%s: invalid yres %d\n",
682 info->fix.id, var->yres);
683 if (var->vsync_len > 100)
684 printk(KERN_ERR "%s: invalid vsync_len %d\n",
685 info->fix.id, var->vsync_len);
686 if (var->upper_margin > 63)
687 printk(KERN_ERR "%s: invalid upper_margin %d\n",
688 info->fix.id, var->upper_margin);
689 if (var->lower_margin > 255)
690 printk(KERN_ERR "%s: invalid lower_margin %d\n",
691 info->fix.id, var->lower_margin);
692 #endif
693
694 /* physical screen start address */
695 writel(VPW_VPW(var->xres * var->bits_per_pixel / 8 / 4),
696 fbi->regs + LCDC_VPW);
697
698 writel(HCR_H_WIDTH(var->hsync_len - 1) |
699 HCR_H_WAIT_1(var->right_margin - 1) |
700 HCR_H_WAIT_2(var->left_margin - 3),
701 fbi->regs + LCDC_HCR);
702
703 writel(VCR_V_WIDTH(var->vsync_len) |
704 VCR_V_WAIT_1(var->lower_margin) |
705 VCR_V_WAIT_2(var->upper_margin),
706 fbi->regs + LCDC_VCR);
707
708 writel(SIZE_XMAX(var->xres) | (var->yres & ymax_mask),
709 fbi->regs + LCDC_SIZE);
710
711 writel(fbi->pcr, fbi->regs + LCDC_PCR);
712 #ifndef PWMR_BACKLIGHT_AVAILABLE
713 if (fbi->pwmr)
714 writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
715 #endif
716 writel(fbi->lscr1, fbi->regs + LCDC_LSCR1);
717
718 /* dmacr = 0 is no valid value, as we need DMA control marks. */
719 if (fbi->dmacr)
720 writel(fbi->dmacr, fbi->regs + LCDC_DMACR);
721
722 return 0;
723 }
724
725 #ifdef CONFIG_PM
726 /*
727 * Power management hooks. Note that we won't be called from IRQ context,
728 * unlike the blank functions above, so we may sleep.
729 */
730 static int imxfb_suspend(struct platform_device *dev, pm_message_t state)
731 {
732 struct fb_info *info = platform_get_drvdata(dev);
733 struct imxfb_info *fbi = info->par;
734
735 pr_debug("%s\n", __func__);
736
737 imxfb_disable_controller(fbi);
738 return 0;
739 }
740
741 static int imxfb_resume(struct platform_device *dev)
742 {
743 struct fb_info *info = platform_get_drvdata(dev);
744 struct imxfb_info *fbi = info->par;
745
746 pr_debug("%s\n", __func__);
747
748 imxfb_enable_controller(fbi);
749 return 0;
750 }
751 #else
752 #define imxfb_suspend NULL
753 #define imxfb_resume NULL
754 #endif
755
756 static int imxfb_init_fbinfo(struct platform_device *pdev)
757 {
758 struct imx_fb_platform_data *pdata = pdev->dev.platform_data;
759 struct fb_info *info = dev_get_drvdata(&pdev->dev);
760 struct imxfb_info *fbi = info->par;
761 struct device_node *np;
762
763 pr_debug("%s\n",__func__);
764
765 info->pseudo_palette = kmalloc(sizeof(u32) * 16, GFP_KERNEL);
766 if (!info->pseudo_palette)
767 return -ENOMEM;
768
769 memset(fbi, 0, sizeof(struct imxfb_info));
770
771 fbi->devtype = pdev->id_entry->driver_data;
772
773 strlcpy(info->fix.id, IMX_NAME, sizeof(info->fix.id));
774
775 info->fix.type = FB_TYPE_PACKED_PIXELS;
776 info->fix.type_aux = 0;
777 info->fix.xpanstep = 0;
778 info->fix.ypanstep = 0;
779 info->fix.ywrapstep = 0;
780 info->fix.accel = FB_ACCEL_NONE;
781
782 info->var.nonstd = 0;
783 info->var.activate = FB_ACTIVATE_NOW;
784 info->var.height = -1;
785 info->var.width = -1;
786 info->var.accel_flags = 0;
787 info->var.vmode = FB_VMODE_NONINTERLACED;
788
789 info->fbops = &imxfb_ops;
790 info->flags = FBINFO_FLAG_DEFAULT |
791 FBINFO_READS_FAST;
792 if (pdata) {
793 info->var.grayscale = pdata->cmap_greyscale;
794 fbi->cmap_inverse = pdata->cmap_inverse;
795 fbi->cmap_static = pdata->cmap_static;
796 fbi->lscr1 = pdata->lscr1;
797 fbi->dmacr = pdata->dmacr;
798 fbi->pwmr = pdata->pwmr;
799 fbi->lcd_power = pdata->lcd_power;
800 fbi->backlight_power = pdata->backlight_power;
801 } else {
802 np = pdev->dev.of_node;
803 info->var.grayscale = of_property_read_bool(np,
804 "cmap-greyscale");
805 fbi->cmap_inverse = of_property_read_bool(np, "cmap-inverse");
806 fbi->cmap_static = of_property_read_bool(np, "cmap-static");
807
808 fbi->lscr1 = IMXFB_LSCR1_DEFAULT;
809 of_property_read_u32(np, "fsl,lscr1", &fbi->lscr1);
810
811 of_property_read_u32(np, "fsl,dmacr", &fbi->dmacr);
812
813 /* These two function pointers could be used by some specific
814 * platforms. */
815 fbi->lcd_power = NULL;
816 fbi->backlight_power = NULL;
817 }
818
819 return 0;
820 }
821
822 static int imxfb_of_read_mode(struct device *dev, struct device_node *np,
823 struct imx_fb_videomode *imxfb_mode)
824 {
825 int ret;
826 struct fb_videomode *of_mode = &imxfb_mode->mode;
827 u32 bpp;
828 u32 pcr;
829
830 ret = of_property_read_string(np, "model", &of_mode->name);
831 if (ret)
832 of_mode->name = NULL;
833
834 ret = of_get_fb_videomode(np, of_mode, OF_USE_NATIVE_MODE);
835 if (ret) {
836 dev_err(dev, "Failed to get videomode from DT\n");
837 return ret;
838 }
839
840 ret = of_property_read_u32(np, "bits-per-pixel", &bpp);
841 ret |= of_property_read_u32(np, "fsl,pcr", &pcr);
842
843 if (ret) {
844 dev_err(dev, "Failed to read bpp and pcr from DT\n");
845 return -EINVAL;
846 }
847
848 if (bpp < 1 || bpp > 255) {
849 dev_err(dev, "Bits per pixel have to be between 1 and 255\n");
850 return -EINVAL;
851 }
852
853 imxfb_mode->bpp = bpp;
854 imxfb_mode->pcr = pcr;
855
856 return 0;
857 }
858
859 static int imxfb_probe(struct platform_device *pdev)
860 {
861 struct imxfb_info *fbi;
862 struct fb_info *info;
863 struct imx_fb_platform_data *pdata;
864 struct resource *res;
865 struct imx_fb_videomode *m;
866 const struct of_device_id *of_id;
867 int ret, i;
868 int bytes_per_pixel;
869
870 dev_info(&pdev->dev, "i.MX Framebuffer driver\n");
871
872 of_id = of_match_device(imxfb_of_dev_id, &pdev->dev);
873 if (of_id)
874 pdev->id_entry = of_id->data;
875
876 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
877 if (!res)
878 return -ENODEV;
879
880 pdata = pdev->dev.platform_data;
881
882 info = framebuffer_alloc(sizeof(struct imxfb_info), &pdev->dev);
883 if (!info)
884 return -ENOMEM;
885
886 fbi = info->par;
887
888 platform_set_drvdata(pdev, info);
889
890 ret = imxfb_init_fbinfo(pdev);
891 if (ret < 0)
892 goto failed_init;
893
894 if (pdata) {
895 if (!fb_mode)
896 fb_mode = pdata->mode[0].mode.name;
897
898 fbi->mode = pdata->mode;
899 fbi->num_modes = pdata->num_modes;
900 } else {
901 struct device_node *display_np;
902 fb_mode = NULL;
903
904 display_np = of_parse_phandle(pdev->dev.of_node, "display", 0);
905 if (!display_np) {
906 dev_err(&pdev->dev, "No display defined in devicetree\n");
907 ret = -EINVAL;
908 goto failed_of_parse;
909 }
910
911 /*
912 * imxfb does not support more modes, we choose only the native
913 * mode.
914 */
915 fbi->num_modes = 1;
916
917 fbi->mode = devm_kzalloc(&pdev->dev,
918 sizeof(struct imx_fb_videomode), GFP_KERNEL);
919 if (!fbi->mode) {
920 ret = -ENOMEM;
921 goto failed_of_parse;
922 }
923
924 ret = imxfb_of_read_mode(&pdev->dev, display_np, fbi->mode);
925 if (ret)
926 goto failed_of_parse;
927 }
928
929 /* Calculate maximum bytes used per pixel. In most cases this should
930 * be the same as m->bpp/8 */
931 m = &fbi->mode[0];
932 bytes_per_pixel = (m->bpp + 7) / 8;
933 for (i = 0; i < fbi->num_modes; i++, m++)
934 info->fix.smem_len = max_t(size_t, info->fix.smem_len,
935 m->mode.xres * m->mode.yres * bytes_per_pixel);
936
937 res = request_mem_region(res->start, resource_size(res),
938 DRIVER_NAME);
939 if (!res) {
940 ret = -EBUSY;
941 goto failed_req;
942 }
943
944 fbi->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
945 if (IS_ERR(fbi->clk_ipg)) {
946 ret = PTR_ERR(fbi->clk_ipg);
947 goto failed_getclock;
948 }
949
950 fbi->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
951 if (IS_ERR(fbi->clk_ahb)) {
952 ret = PTR_ERR(fbi->clk_ahb);
953 goto failed_getclock;
954 }
955
956 fbi->clk_per = devm_clk_get(&pdev->dev, "per");
957 if (IS_ERR(fbi->clk_per)) {
958 ret = PTR_ERR(fbi->clk_per);
959 goto failed_getclock;
960 }
961
962 fbi->regs = ioremap(res->start, resource_size(res));
963 if (fbi->regs == NULL) {
964 dev_err(&pdev->dev, "Cannot map frame buffer registers\n");
965 ret = -ENOMEM;
966 goto failed_ioremap;
967 }
968
969 /* Seems not being used by anyone, so no support for oftree */
970 if (!pdata || !pdata->fixed_screen_cpu) {
971 fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
972 fbi->map_cpu = dma_alloc_writecombine(&pdev->dev,
973 fbi->map_size, &fbi->map_dma, GFP_KERNEL);
974
975 if (!fbi->map_cpu) {
976 dev_err(&pdev->dev, "Failed to allocate video RAM: %d\n", ret);
977 ret = -ENOMEM;
978 goto failed_map;
979 }
980
981 info->screen_base = fbi->map_cpu;
982 fbi->screen_cpu = fbi->map_cpu;
983 fbi->screen_dma = fbi->map_dma;
984 info->fix.smem_start = fbi->screen_dma;
985 } else {
986 /* Fixed framebuffer mapping enables location of the screen in eSRAM */
987 fbi->map_cpu = pdata->fixed_screen_cpu;
988 fbi->map_dma = pdata->fixed_screen_dma;
989 info->screen_base = fbi->map_cpu;
990 fbi->screen_cpu = fbi->map_cpu;
991 fbi->screen_dma = fbi->map_dma;
992 info->fix.smem_start = fbi->screen_dma;
993 }
994
995 if (pdata && pdata->init) {
996 ret = pdata->init(fbi->pdev);
997 if (ret)
998 goto failed_platform_init;
999 }
1000
1001
1002 INIT_LIST_HEAD(&info->modelist);
1003 for (i = 0; i < fbi->num_modes; i++)
1004 fb_add_videomode(&fbi->mode[i].mode, &info->modelist);
1005
1006 /*
1007 * This makes sure that our colour bitfield
1008 * descriptors are correctly initialised.
1009 */
1010 imxfb_check_var(&info->var, info);
1011
1012 ret = fb_alloc_cmap(&info->cmap, 1 << info->var.bits_per_pixel, 0);
1013 if (ret < 0)
1014 goto failed_cmap;
1015
1016 imxfb_set_par(info);
1017 ret = register_framebuffer(info);
1018 if (ret < 0) {
1019 dev_err(&pdev->dev, "failed to register framebuffer\n");
1020 goto failed_register;
1021 }
1022
1023 imxfb_enable_controller(fbi);
1024 fbi->pdev = pdev;
1025 #ifdef PWMR_BACKLIGHT_AVAILABLE
1026 imxfb_init_backlight(fbi);
1027 #endif
1028
1029 return 0;
1030
1031 failed_register:
1032 fb_dealloc_cmap(&info->cmap);
1033 failed_cmap:
1034 if (pdata && pdata->exit)
1035 pdata->exit(fbi->pdev);
1036 failed_platform_init:
1037 if (pdata && !pdata->fixed_screen_cpu)
1038 dma_free_writecombine(&pdev->dev,fbi->map_size,fbi->map_cpu,
1039 fbi->map_dma);
1040 failed_map:
1041 iounmap(fbi->regs);
1042 failed_ioremap:
1043 failed_getclock:
1044 release_mem_region(res->start, resource_size(res));
1045 failed_req:
1046 failed_of_parse:
1047 kfree(info->pseudo_palette);
1048 failed_init:
1049 framebuffer_release(info);
1050 return ret;
1051 }
1052
1053 static int imxfb_remove(struct platform_device *pdev)
1054 {
1055 struct imx_fb_platform_data *pdata;
1056 struct fb_info *info = platform_get_drvdata(pdev);
1057 struct imxfb_info *fbi = info->par;
1058 struct resource *res;
1059
1060 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1061
1062 imxfb_disable_controller(fbi);
1063
1064 #ifdef PWMR_BACKLIGHT_AVAILABLE
1065 imxfb_exit_backlight(fbi);
1066 #endif
1067 unregister_framebuffer(info);
1068
1069 pdata = pdev->dev.platform_data;
1070 if (pdata && pdata->exit)
1071 pdata->exit(fbi->pdev);
1072
1073 fb_dealloc_cmap(&info->cmap);
1074 kfree(info->pseudo_palette);
1075 framebuffer_release(info);
1076
1077 iounmap(fbi->regs);
1078 release_mem_region(res->start, resource_size(res));
1079
1080 return 0;
1081 }
1082
1083 static void imxfb_shutdown(struct platform_device *dev)
1084 {
1085 struct fb_info *info = platform_get_drvdata(dev);
1086 struct imxfb_info *fbi = info->par;
1087 imxfb_disable_controller(fbi);
1088 }
1089
1090 static struct platform_driver imxfb_driver = {
1091 .suspend = imxfb_suspend,
1092 .resume = imxfb_resume,
1093 .remove = imxfb_remove,
1094 .shutdown = imxfb_shutdown,
1095 .driver = {
1096 .name = DRIVER_NAME,
1097 .of_match_table = imxfb_of_dev_id,
1098 },
1099 .id_table = imxfb_devtype,
1100 };
1101
1102 static int imxfb_setup(void)
1103 {
1104 #ifndef MODULE
1105 char *opt, *options = NULL;
1106
1107 if (fb_get_options("imxfb", &options))
1108 return -ENODEV;
1109
1110 if (!options || !*options)
1111 return 0;
1112
1113 while ((opt = strsep(&options, ",")) != NULL) {
1114 if (!*opt)
1115 continue;
1116 else
1117 fb_mode = opt;
1118 }
1119 #endif
1120 return 0;
1121 }
1122
1123 static int __init imxfb_init(void)
1124 {
1125 int ret = imxfb_setup();
1126
1127 if (ret < 0)
1128 return ret;
1129
1130 return platform_driver_probe(&imxfb_driver, imxfb_probe);
1131 }
1132
1133 static void __exit imxfb_cleanup(void)
1134 {
1135 platform_driver_unregister(&imxfb_driver);
1136 }
1137
1138 module_init(imxfb_init);
1139 module_exit(imxfb_cleanup);
1140
1141 MODULE_DESCRIPTION("Freescale i.MX framebuffer driver");
1142 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
1143 MODULE_LICENSE("GPL");
CRIS linux kernel tree