Loading...
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
35#include <mach/imxfb.h>
36#include <mach/hardware.h>
37
38/*
39 * Complain if VAR is out of range.
40 */
41#define DEBUG_VAR 1
42
43#if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || \
44 (defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE) && \
45 defined(CONFIG_FB_IMX_MODULE))
46#define PWMR_BACKLIGHT_AVAILABLE
47#endif
48
49#define DRIVER_NAME "imx-fb"
50
51#define LCDC_SSA 0x00
52
53#define LCDC_SIZE 0x04
54#define SIZE_XMAX(x) ((((x) >> 4) & 0x3f) << 20)
55
56#define YMAX_MASK (cpu_is_mx1() ? 0x1ff : 0x3ff)
57#define SIZE_YMAX(y) ((y) & YMAX_MASK)
58
59#define LCDC_VPW 0x08
60#define VPW_VPW(x) ((x) & 0x3ff)
61
62#define LCDC_CPOS 0x0C
63#define CPOS_CC1 (1<<31)
64#define CPOS_CC0 (1<<30)
65#define CPOS_OP (1<<28)
66#define CPOS_CXP(x) (((x) & 3ff) << 16)
67
68#define LCDC_LCWHB 0x10
69#define LCWHB_BK_EN (1<<31)
70#define LCWHB_CW(w) (((w) & 0x1f) << 24)
71#define LCWHB_CH(h) (((h) & 0x1f) << 16)
72#define LCWHB_BD(x) ((x) & 0xff)
73
74#define LCDC_LCHCC 0x14
75
76#define LCDC_PCR 0x18
77
78#define LCDC_HCR 0x1C
79#define HCR_H_WIDTH(x) (((x) & 0x3f) << 26)
80#define HCR_H_WAIT_1(x) (((x) & 0xff) << 8)
81#define HCR_H_WAIT_2(x) ((x) & 0xff)
82
83#define LCDC_VCR 0x20
84#define VCR_V_WIDTH(x) (((x) & 0x3f) << 26)
85#define VCR_V_WAIT_1(x) (((x) & 0xff) << 8)
86#define VCR_V_WAIT_2(x) ((x) & 0xff)
87
88#define LCDC_POS 0x24
89#define POS_POS(x) ((x) & 1f)
90
91#define LCDC_LSCR1 0x28
92/* bit fields in imxfb.h */
93
94#define LCDC_PWMR 0x2C
95/* bit fields in imxfb.h */
96
97#define LCDC_DMACR 0x30
98/* bit fields in imxfb.h */
99
100#define LCDC_RMCR 0x34
101
102#define RMCR_LCDC_EN_MX1 (1<<1)
103
104#define RMCR_SELF_REF (1<<0)
105
106#define LCDC_LCDICR 0x38
107#define LCDICR_INT_SYN (1<<2)
108#define LCDICR_INT_CON (1)
109
110#define LCDC_LCDISR 0x40
111#define LCDISR_UDR_ERR (1<<3)
112#define LCDISR_ERR_RES (1<<2)
113#define LCDISR_EOF (1<<1)
114#define LCDISR_BOF (1<<0)
115
116/* Used fb-mode. Can be set on kernel command line, therefore file-static. */
117static const char *fb_mode;
118
119
120/*
121 * These are the bitfields for each
122 * display depth that we support.
123 */
124struct imxfb_rgb {
125 struct fb_bitfield red;
126 struct fb_bitfield green;
127 struct fb_bitfield blue;
128 struct fb_bitfield transp;
129};
130
131struct imxfb_info {
132 struct platform_device *pdev;
133 void __iomem *regs;
134 struct clk *clk_ipg;
135 struct clk *clk_ahb;
136 struct clk *clk_per;
137
138 /*
139 * These are the addresses we mapped
140 * the framebuffer memory region to.
141 */
142 dma_addr_t map_dma;
143 u_char *map_cpu;
144 u_int map_size;
145
146 u_char *screen_cpu;
147 dma_addr_t screen_dma;
148 u_int palette_size;
149
150 dma_addr_t dbar1;
151 dma_addr_t dbar2;
152
153 u_int pcr;
154 u_int pwmr;
155 u_int lscr1;
156 u_int dmacr;
157 u_int cmap_inverse:1,
158 cmap_static:1,
159 unused:30;
160
161 struct imx_fb_videomode *mode;
162 int num_modes;
163#ifdef PWMR_BACKLIGHT_AVAILABLE
164 struct backlight_device *bl;
165#endif
166
167 void (*lcd_power)(int);
168 void (*backlight_power)(int);
169};
170
171#define IMX_NAME "IMX"
172
173/*
174 * Minimum X and Y resolutions
175 */
176#define MIN_XRES 64
177#define MIN_YRES 64
178
179/* Actually this really is 18bit support, the lowest 2 bits of each colour
180 * are unused in hardware. We claim to have 24bit support to make software
181 * like X work, which does not support 18bit.
182 */
183static struct imxfb_rgb def_rgb_18 = {
184 .red = {.offset = 16, .length = 8,},
185 .green = {.offset = 8, .length = 8,},
186 .blue = {.offset = 0, .length = 8,},
187 .transp = {.offset = 0, .length = 0,},
188};
189
190static struct imxfb_rgb def_rgb_16_tft = {
191 .red = {.offset = 11, .length = 5,},
192 .green = {.offset = 5, .length = 6,},
193 .blue = {.offset = 0, .length = 5,},
194 .transp = {.offset = 0, .length = 0,},
195};
196
197static struct imxfb_rgb def_rgb_16_stn = {
198 .red = {.offset = 8, .length = 4,},
199 .green = {.offset = 4, .length = 4,},
200 .blue = {.offset = 0, .length = 4,},
201 .transp = {.offset = 0, .length = 0,},
202};
203
204static struct imxfb_rgb def_rgb_8 = {
205 .red = {.offset = 0, .length = 8,},
206 .green = {.offset = 0, .length = 8,},
207 .blue = {.offset = 0, .length = 8,},
208 .transp = {.offset = 0, .length = 0,},
209};
210
211static int imxfb_activate_var(struct fb_var_screeninfo *var,
212 struct fb_info *info);
213
214static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
215{
216 chan &= 0xffff;
217 chan >>= 16 - bf->length;
218 return chan << bf->offset;
219}
220
221static int imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
222 u_int trans, struct fb_info *info)
223{
224 struct imxfb_info *fbi = info->par;
225 u_int val, ret = 1;
226
227#define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
228 if (regno < fbi->palette_size) {
229 val = (CNVT_TOHW(red, 4) << 8) |
230 (CNVT_TOHW(green,4) << 4) |
231 CNVT_TOHW(blue, 4);
232
233 writel(val, fbi->regs + 0x800 + (regno << 2));
234 ret = 0;
235 }
236 return ret;
237}
238
239static int imxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
240 u_int trans, struct fb_info *info)
241{
242 struct imxfb_info *fbi = info->par;
243 unsigned int val;
244 int ret = 1;
245
246 /*
247 * If inverse mode was selected, invert all the colours
248 * rather than the register number. The register number
249 * is what you poke into the framebuffer to produce the
250 * colour you requested.
251 */
252 if (fbi->cmap_inverse) {
253 red = 0xffff - red;
254 green = 0xffff - green;
255 blue = 0xffff - blue;
256 }
257
258 /*
259 * If greyscale is true, then we convert the RGB value
260 * to greyscale no mater what visual we are using.
261 */
262 if (info->var.grayscale)
263 red = green = blue = (19595 * red + 38470 * green +
264 7471 * blue) >> 16;
265
266 switch (info->fix.visual) {
267 case FB_VISUAL_TRUECOLOR:
268 /*
269 * 12 or 16-bit True Colour. We encode the RGB value
270 * according to the RGB bitfield information.
271 */
272 if (regno < 16) {
273 u32 *pal = info->pseudo_palette;
274
275 val = chan_to_field(red, &info->var.red);
276 val |= chan_to_field(green, &info->var.green);
277 val |= chan_to_field(blue, &info->var.blue);
278
279 pal[regno] = val;
280 ret = 0;
281 }
282 break;
283
284 case FB_VISUAL_STATIC_PSEUDOCOLOR:
285 case FB_VISUAL_PSEUDOCOLOR:
286 ret = imxfb_setpalettereg(regno, red, green, blue, trans, info);
287 break;
288 }
289
290 return ret;
291}
292
293static const struct imx_fb_videomode *imxfb_find_mode(struct imxfb_info *fbi)
294{
295 struct imx_fb_videomode *m;
296 int i;
297
298 for (i = 0, m = &fbi->mode[0]; i < fbi->num_modes; i++, m++) {
299 if (!strcmp(m->mode.name, fb_mode))
300 return m;
301 }
302 return NULL;
303}
304
305/*
306 * imxfb_check_var():
307 * Round up in the following order: bits_per_pixel, xres,
308 * yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
309 * bitfields, horizontal timing, vertical timing.
310 */
311static int imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
312{
313 struct imxfb_info *fbi = info->par;
314 struct imxfb_rgb *rgb;
315 const struct imx_fb_videomode *imxfb_mode;
316 unsigned long lcd_clk;
317 unsigned long long tmp;
318 u32 pcr = 0;
319
320 if (var->xres < MIN_XRES)
321 var->xres = MIN_XRES;
322 if (var->yres < MIN_YRES)
323 var->yres = MIN_YRES;
324
325 imxfb_mode = imxfb_find_mode(fbi);
326 if (!imxfb_mode)
327 return -EINVAL;
328
329 var->xres = imxfb_mode->mode.xres;
330 var->yres = imxfb_mode->mode.yres;
331 var->bits_per_pixel = imxfb_mode->bpp;
332 var->pixclock = imxfb_mode->mode.pixclock;
333 var->hsync_len = imxfb_mode->mode.hsync_len;
334 var->left_margin = imxfb_mode->mode.left_margin;
335 var->right_margin = imxfb_mode->mode.right_margin;
336 var->vsync_len = imxfb_mode->mode.vsync_len;
337 var->upper_margin = imxfb_mode->mode.upper_margin;
338 var->lower_margin = imxfb_mode->mode.lower_margin;
339 var->sync = imxfb_mode->mode.sync;
340 var->xres_virtual = max(var->xres_virtual, var->xres);
341 var->yres_virtual = max(var->yres_virtual, var->yres);
342
343 pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel);
344
345 lcd_clk = clk_get_rate(fbi->clk_per);
346
347 tmp = var->pixclock * (unsigned long long)lcd_clk;
348
349 do_div(tmp, 1000000);
350
351 if (do_div(tmp, 1000000) > 500000)
352 tmp++;
353
354 pcr = (unsigned int)tmp;
355
356 if (--pcr > 0x3F) {
357 pcr = 0x3F;
358 printk(KERN_WARNING "Must limit pixel clock to %luHz\n",
359 lcd_clk / pcr);
360 }
361
362 switch (var->bits_per_pixel) {
363 case 32:
364 pcr |= PCR_BPIX_18;
365 rgb = &def_rgb_18;
366 break;
367 case 16:
368 default:
369 if (cpu_is_mx1())
370 pcr |= PCR_BPIX_12;
371 else
372 pcr |= PCR_BPIX_16;
373
374 if (imxfb_mode->pcr & PCR_TFT)
375 rgb = &def_rgb_16_tft;
376 else
377 rgb = &def_rgb_16_stn;
378 break;
379 case 8:
380 pcr |= PCR_BPIX_8;
381 rgb = &def_rgb_8;
382 break;
383 }
384
385 /* add sync polarities */
386 pcr |= imxfb_mode->pcr & ~(0x3f | (7 << 25));
387
388 fbi->pcr = pcr;
389
390 /*
391 * Copy the RGB parameters for this display
392 * from the machine specific parameters.
393 */
394 var->red = rgb->red;
395 var->green = rgb->green;
396 var->blue = rgb->blue;
397 var->transp = rgb->transp;
398
399 pr_debug("RGBT length = %d:%d:%d:%d\n",
400 var->red.length, var->green.length, var->blue.length,
401 var->transp.length);
402
403 pr_debug("RGBT offset = %d:%d:%d:%d\n",
404 var->red.offset, var->green.offset, var->blue.offset,
405 var->transp.offset);
406
407 return 0;
408}
409
410/*
411 * imxfb_set_par():
412 * Set the user defined part of the display for the specified console
413 */
414static int imxfb_set_par(struct fb_info *info)
415{
416 struct imxfb_info *fbi = info->par;
417 struct fb_var_screeninfo *var = &info->var;
418
419 if (var->bits_per_pixel == 16 || var->bits_per_pixel == 32)
420 info->fix.visual = FB_VISUAL_TRUECOLOR;
421 else if (!fbi->cmap_static)
422 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
423 else {
424 /*
425 * Some people have weird ideas about wanting static
426 * pseudocolor maps. I suspect their user space
427 * applications are broken.
428 */
429 info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
430 }
431
432 info->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8;
433 fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16;
434
435 imxfb_activate_var(var, info);
436
437 return 0;
438}
439
440#ifdef PWMR_BACKLIGHT_AVAILABLE
441static int imxfb_bl_get_brightness(struct backlight_device *bl)
442{
443 struct imxfb_info *fbi = bl_get_data(bl);
444
445 return readl(fbi->regs + LCDC_PWMR) & 0xFF;
446}
447
448static int imxfb_bl_update_status(struct backlight_device *bl)
449{
450 struct imxfb_info *fbi = bl_get_data(bl);
451 int brightness = bl->props.brightness;
452
453 if (bl->props.power != FB_BLANK_UNBLANK)
454 brightness = 0;
455 if (bl->props.fb_blank != FB_BLANK_UNBLANK)
456 brightness = 0;
457
458 fbi->pwmr = (fbi->pwmr & ~0xFF) | brightness;
459
460 if (bl->props.fb_blank != FB_BLANK_UNBLANK) {
461 clk_prepare_enable(fbi->clk_ipg);
462 clk_prepare_enable(fbi->clk_ahb);
463 clk_prepare_enable(fbi->clk_per);
464 }
465 writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
466 if (bl->props.fb_blank != FB_BLANK_UNBLANK) {
467 clk_disable_unprepare(fbi->clk_per);
468 clk_disable_unprepare(fbi->clk_ahb);
469 clk_disable_unprepare(fbi->clk_ipg);
470 }
471
472 return 0;
473}
474
475static const struct backlight_ops imxfb_lcdc_bl_ops = {
476 .update_status = imxfb_bl_update_status,
477 .get_brightness = imxfb_bl_get_brightness,
478};
479
480static void imxfb_init_backlight(struct imxfb_info *fbi)
481{
482 struct backlight_properties props;
483 struct backlight_device *bl;
484
485 if (fbi->bl)
486 return;
487
488 memset(&props, 0, sizeof(struct backlight_properties));
489 props.max_brightness = 0xff;
490 props.type = BACKLIGHT_RAW;
491 writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
492
493 bl = backlight_device_register("imxfb-bl", &fbi->pdev->dev, fbi,
494 &imxfb_lcdc_bl_ops, &props);
495 if (IS_ERR(bl)) {
496 dev_err(&fbi->pdev->dev, "error %ld on backlight register\n",
497 PTR_ERR(bl));
498 return;
499 }
500
501 fbi->bl = bl;
502 bl->props.power = FB_BLANK_UNBLANK;
503 bl->props.fb_blank = FB_BLANK_UNBLANK;
504 bl->props.brightness = imxfb_bl_get_brightness(bl);
505}
506
507static void imxfb_exit_backlight(struct imxfb_info *fbi)
508{
509 if (fbi->bl)
510 backlight_device_unregister(fbi->bl);
511}
512#endif
513
514static void imxfb_enable_controller(struct imxfb_info *fbi)
515{
516 pr_debug("Enabling LCD controller\n");
517
518 writel(fbi->screen_dma, fbi->regs + LCDC_SSA);
519
520 /* panning offset 0 (0 pixel offset) */
521 writel(0x00000000, fbi->regs + LCDC_POS);
522
523 /* disable hardware cursor */
524 writel(readl(fbi->regs + LCDC_CPOS) & ~(CPOS_CC0 | CPOS_CC1),
525 fbi->regs + LCDC_CPOS);
526
527 /*
528 * RMCR_LCDC_EN_MX1 is present on i.MX1 only, but doesn't hurt
529 * on other SoCs
530 */
531 writel(RMCR_LCDC_EN_MX1, fbi->regs + LCDC_RMCR);
532
533 clk_prepare_enable(fbi->clk_ipg);
534 clk_prepare_enable(fbi->clk_ahb);
535 clk_prepare_enable(fbi->clk_per);
536
537 if (fbi->backlight_power)
538 fbi->backlight_power(1);
539 if (fbi->lcd_power)
540 fbi->lcd_power(1);
541}
542
543static void imxfb_disable_controller(struct imxfb_info *fbi)
544{
545 pr_debug("Disabling LCD controller\n");
546
547 if (fbi->backlight_power)
548 fbi->backlight_power(0);
549 if (fbi->lcd_power)
550 fbi->lcd_power(0);
551
552 clk_disable_unprepare(fbi->clk_per);
553 clk_disable_unprepare(fbi->clk_ipg);
554 clk_disable_unprepare(fbi->clk_ahb);
555
556 writel(0, fbi->regs + LCDC_RMCR);
557}
558
559static int imxfb_blank(int blank, struct fb_info *info)
560{
561 struct imxfb_info *fbi = info->par;
562
563 pr_debug("imxfb_blank: blank=%d\n", blank);
564
565 switch (blank) {
566 case FB_BLANK_POWERDOWN:
567 case FB_BLANK_VSYNC_SUSPEND:
568 case FB_BLANK_HSYNC_SUSPEND:
569 case FB_BLANK_NORMAL:
570 imxfb_disable_controller(fbi);
571 break;
572
573 case FB_BLANK_UNBLANK:
574 imxfb_enable_controller(fbi);
575 break;
576 }
577 return 0;
578}
579
580static struct fb_ops imxfb_ops = {
581 .owner = THIS_MODULE,
582 .fb_check_var = imxfb_check_var,
583 .fb_set_par = imxfb_set_par,
584 .fb_setcolreg = imxfb_setcolreg,
585 .fb_fillrect = cfb_fillrect,
586 .fb_copyarea = cfb_copyarea,
587 .fb_imageblit = cfb_imageblit,
588 .fb_blank = imxfb_blank,
589};
590
591/*
592 * imxfb_activate_var():
593 * Configures LCD Controller based on entries in var parameter. Settings are
594 * only written to the controller if changes were made.
595 */
596static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info)
597{
598 struct imxfb_info *fbi = info->par;
599
600 pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",
601 var->xres, var->hsync_len,
602 var->left_margin, var->right_margin);
603 pr_debug("var: yres=%d vslen=%d um=%d bm=%d\n",
604 var->yres, var->vsync_len,
605 var->upper_margin, var->lower_margin);
606
607#if DEBUG_VAR
608 if (var->xres < 16 || var->xres > 1024)
609 printk(KERN_ERR "%s: invalid xres %d\n",
610 info->fix.id, var->xres);
611 if (var->hsync_len < 1 || var->hsync_len > 64)
612 printk(KERN_ERR "%s: invalid hsync_len %d\n",
613 info->fix.id, var->hsync_len);
614 if (var->left_margin > 255)
615 printk(KERN_ERR "%s: invalid left_margin %d\n",
616 info->fix.id, var->left_margin);
617 if (var->right_margin > 255)
618 printk(KERN_ERR "%s: invalid right_margin %d\n",
619 info->fix.id, var->right_margin);
620 if (var->yres < 1 || var->yres > YMAX_MASK)
621 printk(KERN_ERR "%s: invalid yres %d\n",
622 info->fix.id, var->yres);
623 if (var->vsync_len > 100)
624 printk(KERN_ERR "%s: invalid vsync_len %d\n",
625 info->fix.id, var->vsync_len);
626 if (var->upper_margin > 63)
627 printk(KERN_ERR "%s: invalid upper_margin %d\n",
628 info->fix.id, var->upper_margin);
629 if (var->lower_margin > 255)
630 printk(KERN_ERR "%s: invalid lower_margin %d\n",
631 info->fix.id, var->lower_margin);
632#endif
633
634 /* physical screen start address */
635 writel(VPW_VPW(var->xres * var->bits_per_pixel / 8 / 4),
636 fbi->regs + LCDC_VPW);
637
638 writel(HCR_H_WIDTH(var->hsync_len - 1) |
639 HCR_H_WAIT_1(var->right_margin - 1) |
640 HCR_H_WAIT_2(var->left_margin - 3),
641 fbi->regs + LCDC_HCR);
642
643 writel(VCR_V_WIDTH(var->vsync_len) |
644 VCR_V_WAIT_1(var->lower_margin) |
645 VCR_V_WAIT_2(var->upper_margin),
646 fbi->regs + LCDC_VCR);
647
648 writel(SIZE_XMAX(var->xres) | SIZE_YMAX(var->yres),
649 fbi->regs + LCDC_SIZE);
650
651 writel(fbi->pcr, fbi->regs + LCDC_PCR);
652#ifndef PWMR_BACKLIGHT_AVAILABLE
653 writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
654#endif
655 writel(fbi->lscr1, fbi->regs + LCDC_LSCR1);
656 writel(fbi->dmacr, fbi->regs + LCDC_DMACR);
657
658 return 0;
659}
660
661#ifdef CONFIG_PM
662/*
663 * Power management hooks. Note that we won't be called from IRQ context,
664 * unlike the blank functions above, so we may sleep.
665 */
666static int imxfb_suspend(struct platform_device *dev, pm_message_t state)
667{
668 struct fb_info *info = platform_get_drvdata(dev);
669 struct imxfb_info *fbi = info->par;
670
671 pr_debug("%s\n", __func__);
672
673 imxfb_disable_controller(fbi);
674 return 0;
675}
676
677static int imxfb_resume(struct platform_device *dev)
678{
679 struct fb_info *info = platform_get_drvdata(dev);
680 struct imxfb_info *fbi = info->par;
681
682 pr_debug("%s\n", __func__);
683
684 imxfb_enable_controller(fbi);
685 return 0;
686}
687#else
688#define imxfb_suspend NULL
689#define imxfb_resume NULL
690#endif
691
692static int __init imxfb_init_fbinfo(struct platform_device *pdev)
693{
694 struct imx_fb_platform_data *pdata = pdev->dev.platform_data;
695 struct fb_info *info = dev_get_drvdata(&pdev->dev);
696 struct imxfb_info *fbi = info->par;
697 struct imx_fb_videomode *m;
698 int i;
699
700 pr_debug("%s\n",__func__);
701
702 info->pseudo_palette = kmalloc(sizeof(u32) * 16, GFP_KERNEL);
703 if (!info->pseudo_palette)
704 return -ENOMEM;
705
706 memset(fbi, 0, sizeof(struct imxfb_info));
707
708 strlcpy(info->fix.id, IMX_NAME, sizeof(info->fix.id));
709
710 info->fix.type = FB_TYPE_PACKED_PIXELS;
711 info->fix.type_aux = 0;
712 info->fix.xpanstep = 0;
713 info->fix.ypanstep = 0;
714 info->fix.ywrapstep = 0;
715 info->fix.accel = FB_ACCEL_NONE;
716
717 info->var.nonstd = 0;
718 info->var.activate = FB_ACTIVATE_NOW;
719 info->var.height = -1;
720 info->var.width = -1;
721 info->var.accel_flags = 0;
722 info->var.vmode = FB_VMODE_NONINTERLACED;
723
724 info->fbops = &imxfb_ops;
725 info->flags = FBINFO_FLAG_DEFAULT |
726 FBINFO_READS_FAST;
727 info->var.grayscale = pdata->cmap_greyscale;
728 fbi->cmap_inverse = pdata->cmap_inverse;
729 fbi->cmap_static = pdata->cmap_static;
730 fbi->lscr1 = pdata->lscr1;
731 fbi->dmacr = pdata->dmacr;
732 fbi->pwmr = pdata->pwmr;
733 fbi->lcd_power = pdata->lcd_power;
734 fbi->backlight_power = pdata->backlight_power;
735
736 for (i = 0, m = &pdata->mode[0]; i < pdata->num_modes; i++, m++)
737 info->fix.smem_len = max_t(size_t, info->fix.smem_len,
738 m->mode.xres * m->mode.yres * m->bpp / 8);
739
740 return 0;
741}
742
743static int __init imxfb_probe(struct platform_device *pdev)
744{
745 struct imxfb_info *fbi;
746 struct fb_info *info;
747 struct imx_fb_platform_data *pdata;
748 struct resource *res;
749 int ret, i;
750
751 dev_info(&pdev->dev, "i.MX Framebuffer driver\n");
752
753 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
754 if (!res)
755 return -ENODEV;
756
757 pdata = pdev->dev.platform_data;
758 if (!pdata) {
759 dev_err(&pdev->dev,"No platform_data available\n");
760 return -ENOMEM;
761 }
762
763 info = framebuffer_alloc(sizeof(struct imxfb_info), &pdev->dev);
764 if (!info)
765 return -ENOMEM;
766
767 fbi = info->par;
768
769 if (!fb_mode)
770 fb_mode = pdata->mode[0].mode.name;
771
772 platform_set_drvdata(pdev, info);
773
774 ret = imxfb_init_fbinfo(pdev);
775 if (ret < 0)
776 goto failed_init;
777
778 res = request_mem_region(res->start, resource_size(res),
779 DRIVER_NAME);
780 if (!res) {
781 ret = -EBUSY;
782 goto failed_req;
783 }
784
785 fbi->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
786 if (IS_ERR(fbi->clk_ipg)) {
787 ret = PTR_ERR(fbi->clk_ipg);
788 goto failed_getclock;
789 }
790
791 fbi->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
792 if (IS_ERR(fbi->clk_ahb)) {
793 ret = PTR_ERR(fbi->clk_ahb);
794 goto failed_getclock;
795 }
796
797 fbi->clk_per = devm_clk_get(&pdev->dev, "per");
798 if (IS_ERR(fbi->clk_per)) {
799 ret = PTR_ERR(fbi->clk_per);
800 goto failed_getclock;
801 }
802
803 fbi->regs = ioremap(res->start, resource_size(res));
804 if (fbi->regs == NULL) {
805 dev_err(&pdev->dev, "Cannot map frame buffer registers\n");
806 goto failed_ioremap;
807 }
808
809 if (!pdata->fixed_screen_cpu) {
810 fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
811 fbi->map_cpu = dma_alloc_writecombine(&pdev->dev,
812 fbi->map_size, &fbi->map_dma, GFP_KERNEL);
813
814 if (!fbi->map_cpu) {
815 dev_err(&pdev->dev, "Failed to allocate video RAM: %d\n", ret);
816 ret = -ENOMEM;
817 goto failed_map;
818 }
819
820 info->screen_base = fbi->map_cpu;
821 fbi->screen_cpu = fbi->map_cpu;
822 fbi->screen_dma = fbi->map_dma;
823 info->fix.smem_start = fbi->screen_dma;
824 } else {
825 /* Fixed framebuffer mapping enables location of the screen in eSRAM */
826 fbi->map_cpu = pdata->fixed_screen_cpu;
827 fbi->map_dma = pdata->fixed_screen_dma;
828 info->screen_base = fbi->map_cpu;
829 fbi->screen_cpu = fbi->map_cpu;
830 fbi->screen_dma = fbi->map_dma;
831 info->fix.smem_start = fbi->screen_dma;
832 }
833
834 if (pdata->init) {
835 ret = pdata->init(fbi->pdev);
836 if (ret)
837 goto failed_platform_init;
838 }
839
840 fbi->mode = pdata->mode;
841 fbi->num_modes = pdata->num_modes;
842
843 INIT_LIST_HEAD(&info->modelist);
844 for (i = 0; i < pdata->num_modes; i++)
845 fb_add_videomode(&pdata->mode[i].mode, &info->modelist);
846
847 /*
848 * This makes sure that our colour bitfield
849 * descriptors are correctly initialised.
850 */
851 imxfb_check_var(&info->var, info);
852
853 ret = fb_alloc_cmap(&info->cmap, 1 << info->var.bits_per_pixel, 0);
854 if (ret < 0)
855 goto failed_cmap;
856
857 imxfb_set_par(info);
858 ret = register_framebuffer(info);
859 if (ret < 0) {
860 dev_err(&pdev->dev, "failed to register framebuffer\n");
861 goto failed_register;
862 }
863
864 imxfb_enable_controller(fbi);
865 fbi->pdev = pdev;
866#ifdef PWMR_BACKLIGHT_AVAILABLE
867 imxfb_init_backlight(fbi);
868#endif
869
870 return 0;
871
872failed_register:
873 fb_dealloc_cmap(&info->cmap);
874failed_cmap:
875 if (pdata->exit)
876 pdata->exit(fbi->pdev);
877failed_platform_init:
878 if (!pdata->fixed_screen_cpu)
879 dma_free_writecombine(&pdev->dev,fbi->map_size,fbi->map_cpu,
880 fbi->map_dma);
881failed_map:
882 iounmap(fbi->regs);
883failed_ioremap:
884failed_getclock:
885 release_mem_region(res->start, resource_size(res));
886failed_req:
887 kfree(info->pseudo_palette);
888failed_init:
889 platform_set_drvdata(pdev, NULL);
890 framebuffer_release(info);
891 return ret;
892}
893
894static int __devexit imxfb_remove(struct platform_device *pdev)
895{
896 struct imx_fb_platform_data *pdata;
897 struct fb_info *info = platform_get_drvdata(pdev);
898 struct imxfb_info *fbi = info->par;
899 struct resource *res;
900
901 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
902
903 imxfb_disable_controller(fbi);
904
905#ifdef PWMR_BACKLIGHT_AVAILABLE
906 imxfb_exit_backlight(fbi);
907#endif
908 unregister_framebuffer(info);
909
910 pdata = pdev->dev.platform_data;
911 if (pdata->exit)
912 pdata->exit(fbi->pdev);
913
914 fb_dealloc_cmap(&info->cmap);
915 kfree(info->pseudo_palette);
916 framebuffer_release(info);
917
918 iounmap(fbi->regs);
919 release_mem_region(res->start, resource_size(res));
920
921 platform_set_drvdata(pdev, NULL);
922
923 return 0;
924}
925
926void imxfb_shutdown(struct platform_device * dev)
927{
928 struct fb_info *info = platform_get_drvdata(dev);
929 struct imxfb_info *fbi = info->par;
930 imxfb_disable_controller(fbi);
931}
932
933static struct platform_driver imxfb_driver = {
934 .suspend = imxfb_suspend,
935 .resume = imxfb_resume,
936 .remove = __devexit_p(imxfb_remove),
937 .shutdown = imxfb_shutdown,
938 .driver = {
939 .name = DRIVER_NAME,
940 },
941};
942
943static int imxfb_setup(void)
944{
945#ifndef MODULE
946 char *opt, *options = NULL;
947
948 if (fb_get_options("imxfb", &options))
949 return -ENODEV;
950
951 if (!options || !*options)
952 return 0;
953
954 while ((opt = strsep(&options, ",")) != NULL) {
955 if (!*opt)
956 continue;
957 else
958 fb_mode = opt;
959 }
960#endif
961 return 0;
962}
963
964int __init imxfb_init(void)
965{
966 int ret = imxfb_setup();
967
968 if (ret < 0)
969 return ret;
970
971 return platform_driver_probe(&imxfb_driver, imxfb_probe);
972}
973
974static void __exit imxfb_cleanup(void)
975{
976 platform_driver_unregister(&imxfb_driver);
977}
978
979module_init(imxfb_init);
980module_exit(imxfb_cleanup);
981
982MODULE_DESCRIPTION("Freescale i.MX framebuffer driver");
983MODULE_AUTHOR("Sascha Hauer, Pengutronix");
984MODULE_LICENSE("GPL");