600f6f9987cc678fc46849fefbc700acef1ea18c
[~shefty/rdma-dev.git] / drivers / video / imxfb.c
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 <linux/platform_data/video-imxfb.h>
36
37 /*
38  * Complain if VAR is out of range.
39  */
40 #define DEBUG_VAR 1
41
42 #if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || \
43         (defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE) && \
44                 defined(CONFIG_FB_IMX_MODULE))
45 #define PWMR_BACKLIGHT_AVAILABLE
46 #endif
47
48 #define DRIVER_NAME "imx-fb"
49
50 #define LCDC_SSA        0x00
51
52 #define LCDC_SIZE       0x04
53 #define SIZE_XMAX(x)    ((((x) >> 4) & 0x3f) << 20)
54
55 #define YMAX_MASK_IMX1  0x1ff
56 #define YMAX_MASK_IMX21 0x3ff
57
58 #define LCDC_VPW        0x08
59 #define VPW_VPW(x)      ((x) & 0x3ff)
60
61 #define LCDC_CPOS       0x0C
62 #define CPOS_CC1        (1<<31)
63 #define CPOS_CC0        (1<<30)
64 #define CPOS_OP         (1<<28)
65 #define CPOS_CXP(x)     (((x) & 3ff) << 16)
66
67 #define LCDC_LCWHB      0x10
68 #define LCWHB_BK_EN     (1<<31)
69 #define LCWHB_CW(w)     (((w) & 0x1f) << 24)
70 #define LCWHB_CH(h)     (((h) & 0x1f) << 16)
71 #define LCWHB_BD(x)     ((x) & 0xff)
72
73 #define LCDC_LCHCC      0x14
74
75 #define LCDC_PCR        0x18
76
77 #define LCDC_HCR        0x1C
78 #define HCR_H_WIDTH(x)  (((x) & 0x3f) << 26)
79 #define HCR_H_WAIT_1(x) (((x) & 0xff) << 8)
80 #define HCR_H_WAIT_2(x) ((x) & 0xff)
81
82 #define LCDC_VCR        0x20
83 #define VCR_V_WIDTH(x)  (((x) & 0x3f) << 26)
84 #define VCR_V_WAIT_1(x) (((x) & 0xff) << 8)
85 #define VCR_V_WAIT_2(x) ((x) & 0xff)
86
87 #define LCDC_POS        0x24
88 #define POS_POS(x)      ((x) & 1f)
89
90 #define LCDC_LSCR1      0x28
91 /* bit fields in imxfb.h */
92
93 #define LCDC_PWMR       0x2C
94 /* bit fields in imxfb.h */
95
96 #define LCDC_DMACR      0x30
97 /* bit fields in imxfb.h */
98
99 #define LCDC_RMCR       0x34
100
101 #define RMCR_LCDC_EN_MX1        (1<<1)
102
103 #define RMCR_SELF_REF   (1<<0)
104
105 #define LCDC_LCDICR     0x38
106 #define LCDICR_INT_SYN  (1<<2)
107 #define LCDICR_INT_CON  (1)
108
109 #define LCDC_LCDISR     0x40
110 #define LCDISR_UDR_ERR  (1<<3)
111 #define LCDISR_ERR_RES  (1<<2)
112 #define LCDISR_EOF      (1<<1)
113 #define LCDISR_BOF      (1<<0)
114
115 /* Used fb-mode. Can be set on kernel command line, therefore file-static. */
116 static const char *fb_mode;
117
118
119 /*
120  * These are the bitfields for each
121  * display depth that we support.
122  */
123 struct imxfb_rgb {
124         struct fb_bitfield      red;
125         struct fb_bitfield      green;
126         struct fb_bitfield      blue;
127         struct fb_bitfield      transp;
128 };
129
130 enum imxfb_type {
131         IMX1_FB,
132         IMX21_FB,
133 };
134
135 struct imxfb_info {
136         struct platform_device  *pdev;
137         void __iomem            *regs;
138         struct clk              *clk_ipg;
139         struct clk              *clk_ahb;
140         struct clk              *clk_per;
141         enum imxfb_type         devtype;
142
143         /*
144          * These are the addresses we mapped
145          * the framebuffer memory region to.
146          */
147         dma_addr_t              map_dma;
148         u_char                  *map_cpu;
149         u_int                   map_size;
150
151         u_char                  *screen_cpu;
152         dma_addr_t              screen_dma;
153         u_int                   palette_size;
154
155         dma_addr_t              dbar1;
156         dma_addr_t              dbar2;
157
158         u_int                   pcr;
159         u_int                   pwmr;
160         u_int                   lscr1;
161         u_int                   dmacr;
162         u_int                   cmap_inverse:1,
163                                 cmap_static:1,
164                                 unused:30;
165
166         struct imx_fb_videomode *mode;
167         int                     num_modes;
168 #ifdef PWMR_BACKLIGHT_AVAILABLE
169         struct backlight_device *bl;
170 #endif
171
172         void (*lcd_power)(int);
173         void (*backlight_power)(int);
174 };
175
176 static struct platform_device_id imxfb_devtype[] = {
177         {
178                 .name = "imx1-fb",
179                 .driver_data = IMX1_FB,
180         }, {
181                 .name = "imx21-fb",
182                 .driver_data = IMX21_FB,
183         }, {
184                 /* sentinel */
185         }
186 };
187 MODULE_DEVICE_TABLE(platform, imxfb_devtype);
188
189 static inline int is_imx1_fb(struct imxfb_info *fbi)
190 {
191         return fbi->devtype == IMX1_FB;
192 }
193
194 #define IMX_NAME        "IMX"
195
196 /*
197  * Minimum X and Y resolutions
198  */
199 #define MIN_XRES        64
200 #define MIN_YRES        64
201
202 /* Actually this really is 18bit support, the lowest 2 bits of each colour
203  * are unused in hardware. We claim to have 24bit support to make software
204  * like X work, which does not support 18bit.
205  */
206 static struct imxfb_rgb def_rgb_18 = {
207         .red    = {.offset = 16, .length = 8,},
208         .green  = {.offset = 8, .length = 8,},
209         .blue   = {.offset = 0, .length = 8,},
210         .transp = {.offset = 0, .length = 0,},
211 };
212
213 static struct imxfb_rgb def_rgb_16_tft = {
214         .red    = {.offset = 11, .length = 5,},
215         .green  = {.offset = 5, .length = 6,},
216         .blue   = {.offset = 0, .length = 5,},
217         .transp = {.offset = 0, .length = 0,},
218 };
219
220 static struct imxfb_rgb def_rgb_16_stn = {
221         .red    = {.offset = 8, .length = 4,},
222         .green  = {.offset = 4, .length = 4,},
223         .blue   = {.offset = 0, .length = 4,},
224         .transp = {.offset = 0, .length = 0,},
225 };
226
227 static struct imxfb_rgb def_rgb_8 = {
228         .red    = {.offset = 0, .length = 8,},
229         .green  = {.offset = 0, .length = 8,},
230         .blue   = {.offset = 0, .length = 8,},
231         .transp = {.offset = 0, .length = 0,},
232 };
233
234 static int imxfb_activate_var(struct fb_var_screeninfo *var,
235                 struct fb_info *info);
236
237 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
238 {
239         chan &= 0xffff;
240         chan >>= 16 - bf->length;
241         return chan << bf->offset;
242 }
243
244 static int imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
245                 u_int trans, struct fb_info *info)
246 {
247         struct imxfb_info *fbi = info->par;
248         u_int val, ret = 1;
249
250 #define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
251         if (regno < fbi->palette_size) {
252                 val = (CNVT_TOHW(red, 4) << 8) |
253                       (CNVT_TOHW(green,4) << 4) |
254                       CNVT_TOHW(blue,  4);
255
256                 writel(val, fbi->regs + 0x800 + (regno << 2));
257                 ret = 0;
258         }
259         return ret;
260 }
261
262 static int imxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
263                    u_int trans, struct fb_info *info)
264 {
265         struct imxfb_info *fbi = info->par;
266         unsigned int val;
267         int ret = 1;
268
269         /*
270          * If inverse mode was selected, invert all the colours
271          * rather than the register number.  The register number
272          * is what you poke into the framebuffer to produce the
273          * colour you requested.
274          */
275         if (fbi->cmap_inverse) {
276                 red   = 0xffff - red;
277                 green = 0xffff - green;
278                 blue  = 0xffff - blue;
279         }
280
281         /*
282          * If greyscale is true, then we convert the RGB value
283          * to greyscale no mater what visual we are using.
284          */
285         if (info->var.grayscale)
286                 red = green = blue = (19595 * red + 38470 * green +
287                                         7471 * blue) >> 16;
288
289         switch (info->fix.visual) {
290         case FB_VISUAL_TRUECOLOR:
291                 /*
292                  * 12 or 16-bit True Colour.  We encode the RGB value
293                  * according to the RGB bitfield information.
294                  */
295                 if (regno < 16) {
296                         u32 *pal = info->pseudo_palette;
297
298                         val  = chan_to_field(red, &info->var.red);
299                         val |= chan_to_field(green, &info->var.green);
300                         val |= chan_to_field(blue, &info->var.blue);
301
302                         pal[regno] = val;
303                         ret = 0;
304                 }
305                 break;
306
307         case FB_VISUAL_STATIC_PSEUDOCOLOR:
308         case FB_VISUAL_PSEUDOCOLOR:
309                 ret = imxfb_setpalettereg(regno, red, green, blue, trans, info);
310                 break;
311         }
312
313         return ret;
314 }
315
316 static const struct imx_fb_videomode *imxfb_find_mode(struct imxfb_info *fbi)
317 {
318         struct imx_fb_videomode *m;
319         int i;
320
321         for (i = 0, m = &fbi->mode[0]; i < fbi->num_modes; i++, m++) {
322                 if (!strcmp(m->mode.name, fb_mode))
323                         return m;
324         }
325         return NULL;
326 }
327
328 /*
329  *  imxfb_check_var():
330  *    Round up in the following order: bits_per_pixel, xres,
331  *    yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
332  *    bitfields, horizontal timing, vertical timing.
333  */
334 static int imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
335 {
336         struct imxfb_info *fbi = info->par;
337         struct imxfb_rgb *rgb;
338         const struct imx_fb_videomode *imxfb_mode;
339         unsigned long lcd_clk;
340         unsigned long long tmp;
341         u32 pcr = 0;
342
343         if (var->xres < MIN_XRES)
344                 var->xres = MIN_XRES;
345         if (var->yres < MIN_YRES)
346                 var->yres = MIN_YRES;
347
348         imxfb_mode = imxfb_find_mode(fbi);
349         if (!imxfb_mode)
350                 return -EINVAL;
351
352         var->xres               = imxfb_mode->mode.xres;
353         var->yres               = imxfb_mode->mode.yres;
354         var->bits_per_pixel     = imxfb_mode->bpp;
355         var->pixclock           = imxfb_mode->mode.pixclock;
356         var->hsync_len          = imxfb_mode->mode.hsync_len;
357         var->left_margin        = imxfb_mode->mode.left_margin;
358         var->right_margin       = imxfb_mode->mode.right_margin;
359         var->vsync_len          = imxfb_mode->mode.vsync_len;
360         var->upper_margin       = imxfb_mode->mode.upper_margin;
361         var->lower_margin       = imxfb_mode->mode.lower_margin;
362         var->sync               = imxfb_mode->mode.sync;
363         var->xres_virtual       = max(var->xres_virtual, var->xres);
364         var->yres_virtual       = max(var->yres_virtual, var->yres);
365
366         pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel);
367
368         lcd_clk = clk_get_rate(fbi->clk_per);
369
370         tmp = var->pixclock * (unsigned long long)lcd_clk;
371
372         do_div(tmp, 1000000);
373
374         if (do_div(tmp, 1000000) > 500000)
375                 tmp++;
376
377         pcr = (unsigned int)tmp;
378
379         if (--pcr > 0x3F) {
380                 pcr = 0x3F;
381                 printk(KERN_WARNING "Must limit pixel clock to %luHz\n",
382                                 lcd_clk / pcr);
383         }
384
385         switch (var->bits_per_pixel) {
386         case 32:
387                 pcr |= PCR_BPIX_18;
388                 rgb = &def_rgb_18;
389                 break;
390         case 16:
391         default:
392                 if (is_imx1_fb(fbi))
393                         pcr |= PCR_BPIX_12;
394                 else
395                         pcr |= PCR_BPIX_16;
396
397                 if (imxfb_mode->pcr & PCR_TFT)
398                         rgb = &def_rgb_16_tft;
399                 else
400                         rgb = &def_rgb_16_stn;
401                 break;
402         case 8:
403                 pcr |= PCR_BPIX_8;
404                 rgb = &def_rgb_8;
405                 break;
406         }
407
408         /* add sync polarities */
409         pcr |= imxfb_mode->pcr & ~(0x3f | (7 << 25));
410
411         fbi->pcr = pcr;
412
413         /*
414          * Copy the RGB parameters for this display
415          * from the machine specific parameters.
416          */
417         var->red    = rgb->red;
418         var->green  = rgb->green;
419         var->blue   = rgb->blue;
420         var->transp = rgb->transp;
421
422         pr_debug("RGBT length = %d:%d:%d:%d\n",
423                 var->red.length, var->green.length, var->blue.length,
424                 var->transp.length);
425
426         pr_debug("RGBT offset = %d:%d:%d:%d\n",
427                 var->red.offset, var->green.offset, var->blue.offset,
428                 var->transp.offset);
429
430         return 0;
431 }
432
433 /*
434  * imxfb_set_par():
435  *      Set the user defined part of the display for the specified console
436  */
437 static int imxfb_set_par(struct fb_info *info)
438 {
439         struct imxfb_info *fbi = info->par;
440         struct fb_var_screeninfo *var = &info->var;
441
442         if (var->bits_per_pixel == 16 || var->bits_per_pixel == 32)
443                 info->fix.visual = FB_VISUAL_TRUECOLOR;
444         else if (!fbi->cmap_static)
445                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
446         else {
447                 /*
448                  * Some people have weird ideas about wanting static
449                  * pseudocolor maps.  I suspect their user space
450                  * applications are broken.
451                  */
452                 info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
453         }
454
455         info->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8;
456         fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16;
457
458         imxfb_activate_var(var, info);
459
460         return 0;
461 }
462
463 #ifdef PWMR_BACKLIGHT_AVAILABLE
464 static int imxfb_bl_get_brightness(struct backlight_device *bl)
465 {
466         struct imxfb_info *fbi = bl_get_data(bl);
467
468         return readl(fbi->regs + LCDC_PWMR) & 0xFF;
469 }
470
471 static int imxfb_bl_update_status(struct backlight_device *bl)
472 {
473         struct imxfb_info *fbi = bl_get_data(bl);
474         int brightness = bl->props.brightness;
475
476         if (bl->props.power != FB_BLANK_UNBLANK)
477                 brightness = 0;
478         if (bl->props.fb_blank != FB_BLANK_UNBLANK)
479                 brightness = 0;
480
481         fbi->pwmr = (fbi->pwmr & ~0xFF) | brightness;
482
483         if (bl->props.fb_blank != FB_BLANK_UNBLANK) {
484                 clk_prepare_enable(fbi->clk_ipg);
485                 clk_prepare_enable(fbi->clk_ahb);
486                 clk_prepare_enable(fbi->clk_per);
487         }
488         writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
489         if (bl->props.fb_blank != FB_BLANK_UNBLANK) {
490                 clk_disable_unprepare(fbi->clk_per);
491                 clk_disable_unprepare(fbi->clk_ahb);
492                 clk_disable_unprepare(fbi->clk_ipg);
493         }
494
495         return 0;
496 }
497
498 static const struct backlight_ops imxfb_lcdc_bl_ops = {
499         .update_status = imxfb_bl_update_status,
500         .get_brightness = imxfb_bl_get_brightness,
501 };
502
503 static void imxfb_init_backlight(struct imxfb_info *fbi)
504 {
505         struct backlight_properties props;
506         struct backlight_device *bl;
507
508         if (fbi->bl)
509                 return;
510
511         memset(&props, 0, sizeof(struct backlight_properties));
512         props.max_brightness = 0xff;
513         props.type = BACKLIGHT_RAW;
514         writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
515
516         bl = backlight_device_register("imxfb-bl", &fbi->pdev->dev, fbi,
517                                        &imxfb_lcdc_bl_ops, &props);
518         if (IS_ERR(bl)) {
519                 dev_err(&fbi->pdev->dev, "error %ld on backlight register\n",
520                                 PTR_ERR(bl));
521                 return;
522         }
523
524         fbi->bl = bl;
525         bl->props.power = FB_BLANK_UNBLANK;
526         bl->props.fb_blank = FB_BLANK_UNBLANK;
527         bl->props.brightness = imxfb_bl_get_brightness(bl);
528 }
529
530 static void imxfb_exit_backlight(struct imxfb_info *fbi)
531 {
532         if (fbi->bl)
533                 backlight_device_unregister(fbi->bl);
534 }
535 #endif
536
537 static void imxfb_enable_controller(struct imxfb_info *fbi)
538 {
539         pr_debug("Enabling LCD controller\n");
540
541         writel(fbi->screen_dma, fbi->regs + LCDC_SSA);
542
543         /* panning offset 0 (0 pixel offset)        */
544         writel(0x00000000, fbi->regs + LCDC_POS);
545
546         /* disable hardware cursor */
547         writel(readl(fbi->regs + LCDC_CPOS) & ~(CPOS_CC0 | CPOS_CC1),
548                 fbi->regs + LCDC_CPOS);
549
550         /*
551          * RMCR_LCDC_EN_MX1 is present on i.MX1 only, but doesn't hurt
552          * on other SoCs
553          */
554         writel(RMCR_LCDC_EN_MX1, fbi->regs + LCDC_RMCR);
555
556         clk_prepare_enable(fbi->clk_ipg);
557         clk_prepare_enable(fbi->clk_ahb);
558         clk_prepare_enable(fbi->clk_per);
559
560         if (fbi->backlight_power)
561                 fbi->backlight_power(1);
562         if (fbi->lcd_power)
563                 fbi->lcd_power(1);
564 }
565
566 static void imxfb_disable_controller(struct imxfb_info *fbi)
567 {
568         pr_debug("Disabling LCD controller\n");
569
570         if (fbi->backlight_power)
571                 fbi->backlight_power(0);
572         if (fbi->lcd_power)
573                 fbi->lcd_power(0);
574
575         clk_disable_unprepare(fbi->clk_per);
576         clk_disable_unprepare(fbi->clk_ipg);
577         clk_disable_unprepare(fbi->clk_ahb);
578
579         writel(0, fbi->regs + LCDC_RMCR);
580 }
581
582 static int imxfb_blank(int blank, struct fb_info *info)
583 {
584         struct imxfb_info *fbi = info->par;
585
586         pr_debug("imxfb_blank: blank=%d\n", blank);
587
588         switch (blank) {
589         case FB_BLANK_POWERDOWN:
590         case FB_BLANK_VSYNC_SUSPEND:
591         case FB_BLANK_HSYNC_SUSPEND:
592         case FB_BLANK_NORMAL:
593                 imxfb_disable_controller(fbi);
594                 break;
595
596         case FB_BLANK_UNBLANK:
597                 imxfb_enable_controller(fbi);
598                 break;
599         }
600         return 0;
601 }
602
603 static struct fb_ops imxfb_ops = {
604         .owner          = THIS_MODULE,
605         .fb_check_var   = imxfb_check_var,
606         .fb_set_par     = imxfb_set_par,
607         .fb_setcolreg   = imxfb_setcolreg,
608         .fb_fillrect    = cfb_fillrect,
609         .fb_copyarea    = cfb_copyarea,
610         .fb_imageblit   = cfb_imageblit,
611         .fb_blank       = imxfb_blank,
612 };
613
614 /*
615  * imxfb_activate_var():
616  *      Configures LCD Controller based on entries in var parameter.  Settings are
617  *      only written to the controller if changes were made.
618  */
619 static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info)
620 {
621         struct imxfb_info *fbi = info->par;
622         u32 ymax_mask = is_imx1_fb(fbi) ? YMAX_MASK_IMX1 : YMAX_MASK_IMX21;
623
624         pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",
625                 var->xres, var->hsync_len,
626                 var->left_margin, var->right_margin);
627         pr_debug("var: yres=%d vslen=%d um=%d bm=%d\n",
628                 var->yres, var->vsync_len,
629                 var->upper_margin, var->lower_margin);
630
631 #if DEBUG_VAR
632         if (var->xres < 16        || var->xres > 1024)
633                 printk(KERN_ERR "%s: invalid xres %d\n",
634                         info->fix.id, var->xres);
635         if (var->hsync_len < 1    || var->hsync_len > 64)
636                 printk(KERN_ERR "%s: invalid hsync_len %d\n",
637                         info->fix.id, var->hsync_len);
638         if (var->left_margin > 255)
639                 printk(KERN_ERR "%s: invalid left_margin %d\n",
640                         info->fix.id, var->left_margin);
641         if (var->right_margin > 255)
642                 printk(KERN_ERR "%s: invalid right_margin %d\n",
643                         info->fix.id, var->right_margin);
644         if (var->yres < 1 || var->yres > ymax_mask)
645                 printk(KERN_ERR "%s: invalid yres %d\n",
646                         info->fix.id, var->yres);
647         if (var->vsync_len > 100)
648                 printk(KERN_ERR "%s: invalid vsync_len %d\n",
649                         info->fix.id, var->vsync_len);
650         if (var->upper_margin > 63)
651                 printk(KERN_ERR "%s: invalid upper_margin %d\n",
652                         info->fix.id, var->upper_margin);
653         if (var->lower_margin > 255)
654                 printk(KERN_ERR "%s: invalid lower_margin %d\n",
655                         info->fix.id, var->lower_margin);
656 #endif
657
658         /* physical screen start address            */
659         writel(VPW_VPW(var->xres * var->bits_per_pixel / 8 / 4),
660                 fbi->regs + LCDC_VPW);
661
662         writel(HCR_H_WIDTH(var->hsync_len - 1) |
663                 HCR_H_WAIT_1(var->right_margin - 1) |
664                 HCR_H_WAIT_2(var->left_margin - 3),
665                 fbi->regs + LCDC_HCR);
666
667         writel(VCR_V_WIDTH(var->vsync_len) |
668                 VCR_V_WAIT_1(var->lower_margin) |
669                 VCR_V_WAIT_2(var->upper_margin),
670                 fbi->regs + LCDC_VCR);
671
672         writel(SIZE_XMAX(var->xres) | (var->yres & ymax_mask),
673                         fbi->regs + LCDC_SIZE);
674
675         writel(fbi->pcr, fbi->regs + LCDC_PCR);
676 #ifndef PWMR_BACKLIGHT_AVAILABLE
677         writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
678 #endif
679         writel(fbi->lscr1, fbi->regs + LCDC_LSCR1);
680         writel(fbi->dmacr, fbi->regs + LCDC_DMACR);
681
682         return 0;
683 }
684
685 #ifdef CONFIG_PM
686 /*
687  * Power management hooks.  Note that we won't be called from IRQ context,
688  * unlike the blank functions above, so we may sleep.
689  */
690 static int imxfb_suspend(struct platform_device *dev, pm_message_t state)
691 {
692         struct fb_info *info = platform_get_drvdata(dev);
693         struct imxfb_info *fbi = info->par;
694
695         pr_debug("%s\n", __func__);
696
697         imxfb_disable_controller(fbi);
698         return 0;
699 }
700
701 static int imxfb_resume(struct platform_device *dev)
702 {
703         struct fb_info *info = platform_get_drvdata(dev);
704         struct imxfb_info *fbi = info->par;
705
706         pr_debug("%s\n", __func__);
707
708         imxfb_enable_controller(fbi);
709         return 0;
710 }
711 #else
712 #define imxfb_suspend   NULL
713 #define imxfb_resume    NULL
714 #endif
715
716 static int __init imxfb_init_fbinfo(struct platform_device *pdev)
717 {
718         struct imx_fb_platform_data *pdata = pdev->dev.platform_data;
719         struct fb_info *info = dev_get_drvdata(&pdev->dev);
720         struct imxfb_info *fbi = info->par;
721         struct imx_fb_videomode *m;
722         int i;
723
724         pr_debug("%s\n",__func__);
725
726         info->pseudo_palette = kmalloc(sizeof(u32) * 16, GFP_KERNEL);
727         if (!info->pseudo_palette)
728                 return -ENOMEM;
729
730         memset(fbi, 0, sizeof(struct imxfb_info));
731
732         fbi->devtype = pdev->id_entry->driver_data;
733
734         strlcpy(info->fix.id, IMX_NAME, sizeof(info->fix.id));
735
736         info->fix.type                  = FB_TYPE_PACKED_PIXELS;
737         info->fix.type_aux              = 0;
738         info->fix.xpanstep              = 0;
739         info->fix.ypanstep              = 0;
740         info->fix.ywrapstep             = 0;
741         info->fix.accel                 = FB_ACCEL_NONE;
742
743         info->var.nonstd                = 0;
744         info->var.activate              = FB_ACTIVATE_NOW;
745         info->var.height                = -1;
746         info->var.width = -1;
747         info->var.accel_flags           = 0;
748         info->var.vmode                 = FB_VMODE_NONINTERLACED;
749
750         info->fbops                     = &imxfb_ops;
751         info->flags                     = FBINFO_FLAG_DEFAULT |
752                                           FBINFO_READS_FAST;
753         info->var.grayscale             = pdata->cmap_greyscale;
754         fbi->cmap_inverse               = pdata->cmap_inverse;
755         fbi->cmap_static                = pdata->cmap_static;
756         fbi->lscr1                      = pdata->lscr1;
757         fbi->dmacr                      = pdata->dmacr;
758         fbi->pwmr                       = pdata->pwmr;
759         fbi->lcd_power                  = pdata->lcd_power;
760         fbi->backlight_power            = pdata->backlight_power;
761
762         for (i = 0, m = &pdata->mode[0]; i < pdata->num_modes; i++, m++)
763                 info->fix.smem_len = max_t(size_t, info->fix.smem_len,
764                                 m->mode.xres * m->mode.yres * m->bpp / 8);
765
766         return 0;
767 }
768
769 static int __init imxfb_probe(struct platform_device *pdev)
770 {
771         struct imxfb_info *fbi;
772         struct fb_info *info;
773         struct imx_fb_platform_data *pdata;
774         struct resource *res;
775         int ret, i;
776
777         dev_info(&pdev->dev, "i.MX Framebuffer driver\n");
778
779         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
780         if (!res)
781                 return -ENODEV;
782
783         pdata = pdev->dev.platform_data;
784         if (!pdata) {
785                 dev_err(&pdev->dev,"No platform_data available\n");
786                 return -ENOMEM;
787         }
788
789         info = framebuffer_alloc(sizeof(struct imxfb_info), &pdev->dev);
790         if (!info)
791                 return -ENOMEM;
792
793         fbi = info->par;
794
795         if (!fb_mode)
796                 fb_mode = pdata->mode[0].mode.name;
797
798         platform_set_drvdata(pdev, info);
799
800         ret = imxfb_init_fbinfo(pdev);
801         if (ret < 0)
802                 goto failed_init;
803
804         res = request_mem_region(res->start, resource_size(res),
805                                 DRIVER_NAME);
806         if (!res) {
807                 ret = -EBUSY;
808                 goto failed_req;
809         }
810
811         fbi->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
812         if (IS_ERR(fbi->clk_ipg)) {
813                 ret = PTR_ERR(fbi->clk_ipg);
814                 goto failed_getclock;
815         }
816
817         fbi->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
818         if (IS_ERR(fbi->clk_ahb)) {
819                 ret = PTR_ERR(fbi->clk_ahb);
820                 goto failed_getclock;
821         }
822
823         fbi->clk_per = devm_clk_get(&pdev->dev, "per");
824         if (IS_ERR(fbi->clk_per)) {
825                 ret = PTR_ERR(fbi->clk_per);
826                 goto failed_getclock;
827         }
828
829         fbi->regs = ioremap(res->start, resource_size(res));
830         if (fbi->regs == NULL) {
831                 dev_err(&pdev->dev, "Cannot map frame buffer registers\n");
832                 ret = -ENOMEM;
833                 goto failed_ioremap;
834         }
835
836         if (!pdata->fixed_screen_cpu) {
837                 fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
838                 fbi->map_cpu = dma_alloc_writecombine(&pdev->dev,
839                                 fbi->map_size, &fbi->map_dma, GFP_KERNEL);
840
841                 if (!fbi->map_cpu) {
842                         dev_err(&pdev->dev, "Failed to allocate video RAM: %d\n", ret);
843                         ret = -ENOMEM;
844                         goto failed_map;
845                 }
846
847                 info->screen_base = fbi->map_cpu;
848                 fbi->screen_cpu = fbi->map_cpu;
849                 fbi->screen_dma = fbi->map_dma;
850                 info->fix.smem_start = fbi->screen_dma;
851         } else {
852                 /* Fixed framebuffer mapping enables location of the screen in eSRAM */
853                 fbi->map_cpu = pdata->fixed_screen_cpu;
854                 fbi->map_dma = pdata->fixed_screen_dma;
855                 info->screen_base = fbi->map_cpu;
856                 fbi->screen_cpu = fbi->map_cpu;
857                 fbi->screen_dma = fbi->map_dma;
858                 info->fix.smem_start = fbi->screen_dma;
859         }
860
861         if (pdata->init) {
862                 ret = pdata->init(fbi->pdev);
863                 if (ret)
864                         goto failed_platform_init;
865         }
866
867         fbi->mode = pdata->mode;
868         fbi->num_modes = pdata->num_modes;
869
870         INIT_LIST_HEAD(&info->modelist);
871         for (i = 0; i < pdata->num_modes; i++)
872                 fb_add_videomode(&pdata->mode[i].mode, &info->modelist);
873
874         /*
875          * This makes sure that our colour bitfield
876          * descriptors are correctly initialised.
877          */
878         imxfb_check_var(&info->var, info);
879
880         ret = fb_alloc_cmap(&info->cmap, 1 << info->var.bits_per_pixel, 0);
881         if (ret < 0)
882                 goto failed_cmap;
883
884         imxfb_set_par(info);
885         ret = register_framebuffer(info);
886         if (ret < 0) {
887                 dev_err(&pdev->dev, "failed to register framebuffer\n");
888                 goto failed_register;
889         }
890
891         imxfb_enable_controller(fbi);
892         fbi->pdev = pdev;
893 #ifdef PWMR_BACKLIGHT_AVAILABLE
894         imxfb_init_backlight(fbi);
895 #endif
896
897         return 0;
898
899 failed_register:
900         fb_dealloc_cmap(&info->cmap);
901 failed_cmap:
902         if (pdata->exit)
903                 pdata->exit(fbi->pdev);
904 failed_platform_init:
905         if (!pdata->fixed_screen_cpu)
906                 dma_free_writecombine(&pdev->dev,fbi->map_size,fbi->map_cpu,
907                         fbi->map_dma);
908 failed_map:
909         iounmap(fbi->regs);
910 failed_ioremap:
911 failed_getclock:
912         release_mem_region(res->start, resource_size(res));
913 failed_req:
914         kfree(info->pseudo_palette);
915 failed_init:
916         platform_set_drvdata(pdev, NULL);
917         framebuffer_release(info);
918         return ret;
919 }
920
921 static int imxfb_remove(struct platform_device *pdev)
922 {
923         struct imx_fb_platform_data *pdata;
924         struct fb_info *info = platform_get_drvdata(pdev);
925         struct imxfb_info *fbi = info->par;
926         struct resource *res;
927
928         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
929
930         imxfb_disable_controller(fbi);
931
932 #ifdef PWMR_BACKLIGHT_AVAILABLE
933         imxfb_exit_backlight(fbi);
934 #endif
935         unregister_framebuffer(info);
936
937         pdata = pdev->dev.platform_data;
938         if (pdata->exit)
939                 pdata->exit(fbi->pdev);
940
941         fb_dealloc_cmap(&info->cmap);
942         kfree(info->pseudo_palette);
943         framebuffer_release(info);
944
945         iounmap(fbi->regs);
946         release_mem_region(res->start, resource_size(res));
947
948         platform_set_drvdata(pdev, NULL);
949
950         return 0;
951 }
952
953 void  imxfb_shutdown(struct platform_device * dev)
954 {
955         struct fb_info *info = platform_get_drvdata(dev);
956         struct imxfb_info *fbi = info->par;
957         imxfb_disable_controller(fbi);
958 }
959
960 static struct platform_driver imxfb_driver = {
961         .suspend        = imxfb_suspend,
962         .resume         = imxfb_resume,
963         .remove         = imxfb_remove,
964         .shutdown       = imxfb_shutdown,
965         .driver         = {
966                 .name   = DRIVER_NAME,
967         },
968         .id_table       = imxfb_devtype,
969 };
970
971 static int imxfb_setup(void)
972 {
973 #ifndef MODULE
974         char *opt, *options = NULL;
975
976         if (fb_get_options("imxfb", &options))
977                 return -ENODEV;
978
979         if (!options || !*options)
980                 return 0;
981
982         while ((opt = strsep(&options, ",")) != NULL) {
983                 if (!*opt)
984                         continue;
985                 else
986                         fb_mode = opt;
987         }
988 #endif
989         return 0;
990 }
991
992 int __init imxfb_init(void)
993 {
994         int ret = imxfb_setup();
995
996         if (ret < 0)
997                 return ret;
998
999         return platform_driver_probe(&imxfb_driver, imxfb_probe);
1000 }
1001
1002 static void __exit imxfb_cleanup(void)
1003 {
1004         platform_driver_unregister(&imxfb_driver);
1005 }
1006
1007 module_init(imxfb_init);
1008 module_exit(imxfb_cleanup);
1009
1010 MODULE_DESCRIPTION("Freescale i.MX framebuffer driver");
1011 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
1012 MODULE_LICENSE("GPL");