5c363d026f64c2856b44e748ecb149d9242be6b6
[~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 <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 #ifdef CONFIG_ARCH_MX1
57 #define SIZE_YMAX(y)    ((y) & 0x1ff)
58 #else
59 #define SIZE_YMAX(y)    ((y) & 0x3ff)
60 #endif
61
62 #define LCDC_VPW        0x08
63 #define VPW_VPW(x)      ((x) & 0x3ff)
64
65 #define LCDC_CPOS       0x0C
66 #define CPOS_CC1        (1<<31)
67 #define CPOS_CC0        (1<<30)
68 #define CPOS_OP         (1<<28)
69 #define CPOS_CXP(x)     (((x) & 3ff) << 16)
70
71 #ifdef CONFIG_ARCH_MX1
72 #define CPOS_CYP(y)     ((y) & 0x1ff)
73 #else
74 #define CPOS_CYP(y)     ((y) & 0x3ff)
75 #endif
76
77 #define LCDC_LCWHB      0x10
78 #define LCWHB_BK_EN     (1<<31)
79 #define LCWHB_CW(w)     (((w) & 0x1f) << 24)
80 #define LCWHB_CH(h)     (((h) & 0x1f) << 16)
81 #define LCWHB_BD(x)     ((x) & 0xff)
82
83 #define LCDC_LCHCC      0x14
84
85 #ifdef CONFIG_ARCH_MX1
86 #define LCHCC_CUR_COL_R(r) (((r) & 0x1f) << 11)
87 #define LCHCC_CUR_COL_G(g) (((g) & 0x3f) << 5)
88 #define LCHCC_CUR_COL_B(b) ((b) & 0x1f)
89 #else
90 #define LCHCC_CUR_COL_R(r) (((r) & 0x3f) << 12)
91 #define LCHCC_CUR_COL_G(g) (((g) & 0x3f) << 6)
92 #define LCHCC_CUR_COL_B(b) ((b) & 0x3f)
93 #endif
94
95 #define LCDC_PCR        0x18
96
97 #define LCDC_HCR        0x1C
98 #define HCR_H_WIDTH(x)  (((x) & 0x3f) << 26)
99 #define HCR_H_WAIT_1(x) (((x) & 0xff) << 8)
100 #define HCR_H_WAIT_2(x) ((x) & 0xff)
101
102 #define LCDC_VCR        0x20
103 #define VCR_V_WIDTH(x)  (((x) & 0x3f) << 26)
104 #define VCR_V_WAIT_1(x) (((x) & 0xff) << 8)
105 #define VCR_V_WAIT_2(x) ((x) & 0xff)
106
107 #define LCDC_POS        0x24
108 #define POS_POS(x)      ((x) & 1f)
109
110 #define LCDC_LSCR1      0x28
111 /* bit fields in imxfb.h */
112
113 #define LCDC_PWMR       0x2C
114 /* bit fields in imxfb.h */
115
116 #define LCDC_DMACR      0x30
117 /* bit fields in imxfb.h */
118
119 #define LCDC_RMCR       0x34
120
121 #ifdef CONFIG_ARCH_MX1
122 #define RMCR_LCDC_EN    (1<<1)
123 #else
124 #define RMCR_LCDC_EN    0
125 #endif
126
127 #define RMCR_SELF_REF   (1<<0)
128
129 #define LCDC_LCDICR     0x38
130 #define LCDICR_INT_SYN  (1<<2)
131 #define LCDICR_INT_CON  (1)
132
133 #define LCDC_LCDISR     0x40
134 #define LCDISR_UDR_ERR  (1<<3)
135 #define LCDISR_ERR_RES  (1<<2)
136 #define LCDISR_EOF      (1<<1)
137 #define LCDISR_BOF      (1<<0)
138
139 /* Used fb-mode. Can be set on kernel command line, therefore file-static. */
140 static const char *fb_mode;
141
142
143 /*
144  * These are the bitfields for each
145  * display depth that we support.
146  */
147 struct imxfb_rgb {
148         struct fb_bitfield      red;
149         struct fb_bitfield      green;
150         struct fb_bitfield      blue;
151         struct fb_bitfield      transp;
152 };
153
154 struct imxfb_info {
155         struct platform_device  *pdev;
156         void __iomem            *regs;
157         struct clk              *clk;
158
159         /*
160          * These are the addresses we mapped
161          * the framebuffer memory region to.
162          */
163         dma_addr_t              map_dma;
164         u_char                  *map_cpu;
165         u_int                   map_size;
166
167         u_char                  *screen_cpu;
168         dma_addr_t              screen_dma;
169         u_int                   palette_size;
170
171         dma_addr_t              dbar1;
172         dma_addr_t              dbar2;
173
174         u_int                   pcr;
175         u_int                   pwmr;
176         u_int                   lscr1;
177         u_int                   dmacr;
178         u_int                   cmap_inverse:1,
179                                 cmap_static:1,
180                                 unused:30;
181
182         struct imx_fb_videomode *mode;
183         int                     num_modes;
184 #ifdef PWMR_BACKLIGHT_AVAILABLE
185         struct backlight_device *bl;
186 #endif
187
188         void (*lcd_power)(int);
189         void (*backlight_power)(int);
190 };
191
192 #define IMX_NAME        "IMX"
193
194 /*
195  * Minimum X and Y resolutions
196  */
197 #define MIN_XRES        64
198 #define MIN_YRES        64
199
200 /* Actually this really is 18bit support, the lowest 2 bits of each colour
201  * are unused in hardware. We claim to have 24bit support to make software
202  * like X work, which does not support 18bit.
203  */
204 static struct imxfb_rgb def_rgb_18 = {
205         .red    = {.offset = 16, .length = 8,},
206         .green  = {.offset = 8, .length = 8,},
207         .blue   = {.offset = 0, .length = 8,},
208         .transp = {.offset = 0, .length = 0,},
209 };
210
211 static struct imxfb_rgb def_rgb_16_tft = {
212         .red    = {.offset = 11, .length = 5,},
213         .green  = {.offset = 5, .length = 6,},
214         .blue   = {.offset = 0, .length = 5,},
215         .transp = {.offset = 0, .length = 0,},
216 };
217
218 static struct imxfb_rgb def_rgb_16_stn = {
219         .red    = {.offset = 8, .length = 4,},
220         .green  = {.offset = 4, .length = 4,},
221         .blue   = {.offset = 0, .length = 4,},
222         .transp = {.offset = 0, .length = 0,},
223 };
224
225 static struct imxfb_rgb def_rgb_8 = {
226         .red    = {.offset = 0, .length = 8,},
227         .green  = {.offset = 0, .length = 8,},
228         .blue   = {.offset = 0, .length = 8,},
229         .transp = {.offset = 0, .length = 0,},
230 };
231
232 static int imxfb_activate_var(struct fb_var_screeninfo *var,
233                 struct fb_info *info);
234
235 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
236 {
237         chan &= 0xffff;
238         chan >>= 16 - bf->length;
239         return chan << bf->offset;
240 }
241
242 static int imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
243                 u_int trans, struct fb_info *info)
244 {
245         struct imxfb_info *fbi = info->par;
246         u_int val, ret = 1;
247
248 #define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
249         if (regno < fbi->palette_size) {
250                 val = (CNVT_TOHW(red, 4) << 8) |
251                       (CNVT_TOHW(green,4) << 4) |
252                       CNVT_TOHW(blue,  4);
253
254                 writel(val, fbi->regs + 0x800 + (regno << 2));
255                 ret = 0;
256         }
257         return ret;
258 }
259
260 static int imxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
261                    u_int trans, struct fb_info *info)
262 {
263         struct imxfb_info *fbi = info->par;
264         unsigned int val;
265         int ret = 1;
266
267         /*
268          * If inverse mode was selected, invert all the colours
269          * rather than the register number.  The register number
270          * is what you poke into the framebuffer to produce the
271          * colour you requested.
272          */
273         if (fbi->cmap_inverse) {
274                 red   = 0xffff - red;
275                 green = 0xffff - green;
276                 blue  = 0xffff - blue;
277         }
278
279         /*
280          * If greyscale is true, then we convert the RGB value
281          * to greyscale no mater what visual we are using.
282          */
283         if (info->var.grayscale)
284                 red = green = blue = (19595 * red + 38470 * green +
285                                         7471 * blue) >> 16;
286
287         switch (info->fix.visual) {
288         case FB_VISUAL_TRUECOLOR:
289                 /*
290                  * 12 or 16-bit True Colour.  We encode the RGB value
291                  * according to the RGB bitfield information.
292                  */
293                 if (regno < 16) {
294                         u32 *pal = info->pseudo_palette;
295
296                         val  = chan_to_field(red, &info->var.red);
297                         val |= chan_to_field(green, &info->var.green);
298                         val |= chan_to_field(blue, &info->var.blue);
299
300                         pal[regno] = val;
301                         ret = 0;
302                 }
303                 break;
304
305         case FB_VISUAL_STATIC_PSEUDOCOLOR:
306         case FB_VISUAL_PSEUDOCOLOR:
307                 ret = imxfb_setpalettereg(regno, red, green, blue, trans, info);
308                 break;
309         }
310
311         return ret;
312 }
313
314 static const struct imx_fb_videomode *imxfb_find_mode(struct imxfb_info *fbi)
315 {
316         struct imx_fb_videomode *m;
317         int i;
318
319         for (i = 0, m = &fbi->mode[0]; i < fbi->num_modes; i++, m++) {
320                 if (!strcmp(m->mode.name, fb_mode))
321                         return m;
322         }
323         return NULL;
324 }
325
326 /*
327  *  imxfb_check_var():
328  *    Round up in the following order: bits_per_pixel, xres,
329  *    yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
330  *    bitfields, horizontal timing, vertical timing.
331  */
332 static int imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
333 {
334         struct imxfb_info *fbi = info->par;
335         struct imxfb_rgb *rgb;
336         const struct imx_fb_videomode *imxfb_mode;
337         unsigned long lcd_clk;
338         unsigned long long tmp;
339         u32 pcr = 0;
340
341         if (var->xres < MIN_XRES)
342                 var->xres = MIN_XRES;
343         if (var->yres < MIN_YRES)
344                 var->yres = MIN_YRES;
345
346         imxfb_mode = imxfb_find_mode(fbi);
347         if (!imxfb_mode)
348                 return -EINVAL;
349
350         var->xres               = imxfb_mode->mode.xres;
351         var->yres               = imxfb_mode->mode.yres;
352         var->bits_per_pixel     = imxfb_mode->bpp;
353         var->pixclock           = imxfb_mode->mode.pixclock;
354         var->hsync_len          = imxfb_mode->mode.hsync_len;
355         var->left_margin        = imxfb_mode->mode.left_margin;
356         var->right_margin       = imxfb_mode->mode.right_margin;
357         var->vsync_len          = imxfb_mode->mode.vsync_len;
358         var->upper_margin       = imxfb_mode->mode.upper_margin;
359         var->lower_margin       = imxfb_mode->mode.lower_margin;
360         var->sync               = imxfb_mode->mode.sync;
361         var->xres_virtual       = max(var->xres_virtual, var->xres);
362         var->yres_virtual       = max(var->yres_virtual, var->yres);
363
364         pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel);
365
366         lcd_clk = clk_get_rate(fbi->clk);
367
368         tmp = var->pixclock * (unsigned long long)lcd_clk;
369
370         do_div(tmp, 1000000);
371
372         if (do_div(tmp, 1000000) > 500000)
373                 tmp++;
374
375         pcr = (unsigned int)tmp;
376
377         if (--pcr > 0x3F) {
378                 pcr = 0x3F;
379                 printk(KERN_WARNING "Must limit pixel clock to %luHz\n",
380                                 lcd_clk / pcr);
381         }
382
383         switch (var->bits_per_pixel) {
384         case 32:
385                 pcr |= PCR_BPIX_18;
386                 rgb = &def_rgb_18;
387                 break;
388         case 16:
389         default:
390                 if (cpu_is_mx1())
391                         pcr |= PCR_BPIX_12;
392                 else
393                         pcr |= PCR_BPIX_16;
394
395                 if (imxfb_mode->pcr & PCR_TFT)
396                         rgb = &def_rgb_16_tft;
397                 else
398                         rgb = &def_rgb_16_stn;
399                 break;
400         case 8:
401                 pcr |= PCR_BPIX_8;
402                 rgb = &def_rgb_8;
403                 break;
404         }
405
406         /* add sync polarities */
407         pcr |= imxfb_mode->pcr & ~(0x3f | (7 << 25));
408
409         fbi->pcr = pcr;
410
411         /*
412          * Copy the RGB parameters for this display
413          * from the machine specific parameters.
414          */
415         var->red    = rgb->red;
416         var->green  = rgb->green;
417         var->blue   = rgb->blue;
418         var->transp = rgb->transp;
419
420         pr_debug("RGBT length = %d:%d:%d:%d\n",
421                 var->red.length, var->green.length, var->blue.length,
422                 var->transp.length);
423
424         pr_debug("RGBT offset = %d:%d:%d:%d\n",
425                 var->red.offset, var->green.offset, var->blue.offset,
426                 var->transp.offset);
427
428         return 0;
429 }
430
431 /*
432  * imxfb_set_par():
433  *      Set the user defined part of the display for the specified console
434  */
435 static int imxfb_set_par(struct fb_info *info)
436 {
437         struct imxfb_info *fbi = info->par;
438         struct fb_var_screeninfo *var = &info->var;
439
440         if (var->bits_per_pixel == 16 || var->bits_per_pixel == 32)
441                 info->fix.visual = FB_VISUAL_TRUECOLOR;
442         else if (!fbi->cmap_static)
443                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
444         else {
445                 /*
446                  * Some people have weird ideas about wanting static
447                  * pseudocolor maps.  I suspect their user space
448                  * applications are broken.
449                  */
450                 info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
451         }
452
453         info->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8;
454         fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16;
455
456         imxfb_activate_var(var, info);
457
458         return 0;
459 }
460
461 #ifdef PWMR_BACKLIGHT_AVAILABLE
462 static int imxfb_bl_get_brightness(struct backlight_device *bl)
463 {
464         struct imxfb_info *fbi = bl_get_data(bl);
465
466         return readl(fbi->regs + LCDC_PWMR) & 0xFF;
467 }
468
469 static int imxfb_bl_update_status(struct backlight_device *bl)
470 {
471         struct imxfb_info *fbi = bl_get_data(bl);
472         int brightness = bl->props.brightness;
473
474         if (bl->props.power != FB_BLANK_UNBLANK)
475                 brightness = 0;
476         if (bl->props.fb_blank != FB_BLANK_UNBLANK)
477                 brightness = 0;
478
479         fbi->pwmr = (fbi->pwmr & ~0xFF) | brightness;
480
481         if (bl->props.fb_blank != FB_BLANK_UNBLANK)
482                 clk_enable(fbi->clk);
483         writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
484         if (bl->props.fb_blank != FB_BLANK_UNBLANK)
485                 clk_disable(fbi->clk);
486
487         return 0;
488 }
489
490 static const struct backlight_ops imxfb_lcdc_bl_ops = {
491         .update_status = imxfb_bl_update_status,
492         .get_brightness = imxfb_bl_get_brightness,
493 };
494
495 static void imxfb_init_backlight(struct imxfb_info *fbi)
496 {
497         struct backlight_properties props;
498         struct backlight_device *bl;
499
500         if (fbi->bl)
501                 return;
502
503         memset(&props, 0, sizeof(struct backlight_properties));
504         props.max_brightness = 0xff;
505         writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
506
507         bl = backlight_device_register("imxfb-bl", &fbi->pdev->dev, fbi,
508                                        &imxfb_lcdc_bl_ops, &props);
509         if (IS_ERR(bl)) {
510                 dev_err(&fbi->pdev->dev, "error %ld on backlight register\n",
511                                 PTR_ERR(bl));
512                 return;
513         }
514
515         fbi->bl = bl;
516         bl->props.power = FB_BLANK_UNBLANK;
517         bl->props.fb_blank = FB_BLANK_UNBLANK;
518         bl->props.brightness = imxfb_bl_get_brightness(bl);
519 }
520
521 static void imxfb_exit_backlight(struct imxfb_info *fbi)
522 {
523         if (fbi->bl)
524                 backlight_device_unregister(fbi->bl);
525 }
526 #endif
527
528 static void imxfb_enable_controller(struct imxfb_info *fbi)
529 {
530         pr_debug("Enabling LCD controller\n");
531
532         writel(fbi->screen_dma, fbi->regs + LCDC_SSA);
533
534         /* panning offset 0 (0 pixel offset)        */
535         writel(0x00000000, fbi->regs + LCDC_POS);
536
537         /* disable hardware cursor */
538         writel(readl(fbi->regs + LCDC_CPOS) & ~(CPOS_CC0 | CPOS_CC1),
539                 fbi->regs + LCDC_CPOS);
540
541         writel(RMCR_LCDC_EN, fbi->regs + LCDC_RMCR);
542
543         clk_enable(fbi->clk);
544
545         if (fbi->backlight_power)
546                 fbi->backlight_power(1);
547         if (fbi->lcd_power)
548                 fbi->lcd_power(1);
549 }
550
551 static void imxfb_disable_controller(struct imxfb_info *fbi)
552 {
553         pr_debug("Disabling LCD controller\n");
554
555         if (fbi->backlight_power)
556                 fbi->backlight_power(0);
557         if (fbi->lcd_power)
558                 fbi->lcd_power(0);
559
560         clk_disable(fbi->clk);
561
562         writel(0, fbi->regs + LCDC_RMCR);
563 }
564
565 static int imxfb_blank(int blank, struct fb_info *info)
566 {
567         struct imxfb_info *fbi = info->par;
568
569         pr_debug("imxfb_blank: blank=%d\n", blank);
570
571         switch (blank) {
572         case FB_BLANK_POWERDOWN:
573         case FB_BLANK_VSYNC_SUSPEND:
574         case FB_BLANK_HSYNC_SUSPEND:
575         case FB_BLANK_NORMAL:
576                 imxfb_disable_controller(fbi);
577                 break;
578
579         case FB_BLANK_UNBLANK:
580                 imxfb_enable_controller(fbi);
581                 break;
582         }
583         return 0;
584 }
585
586 static struct fb_ops imxfb_ops = {
587         .owner          = THIS_MODULE,
588         .fb_check_var   = imxfb_check_var,
589         .fb_set_par     = imxfb_set_par,
590         .fb_setcolreg   = imxfb_setcolreg,
591         .fb_fillrect    = cfb_fillrect,
592         .fb_copyarea    = cfb_copyarea,
593         .fb_imageblit   = cfb_imageblit,
594         .fb_blank       = imxfb_blank,
595 };
596
597 /*
598  * imxfb_activate_var():
599  *      Configures LCD Controller based on entries in var parameter.  Settings are
600  *      only written to the controller if changes were made.
601  */
602 static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info)
603 {
604         struct imxfb_info *fbi = info->par;
605
606         pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",
607                 var->xres, var->hsync_len,
608                 var->left_margin, var->right_margin);
609         pr_debug("var: yres=%d vslen=%d um=%d bm=%d\n",
610                 var->yres, var->vsync_len,
611                 var->upper_margin, var->lower_margin);
612
613 #if DEBUG_VAR
614         if (var->xres < 16        || var->xres > 1024)
615                 printk(KERN_ERR "%s: invalid xres %d\n",
616                         info->fix.id, var->xres);
617         if (var->hsync_len < 1    || var->hsync_len > 64)
618                 printk(KERN_ERR "%s: invalid hsync_len %d\n",
619                         info->fix.id, var->hsync_len);
620         if (var->left_margin > 255)
621                 printk(KERN_ERR "%s: invalid left_margin %d\n",
622                         info->fix.id, var->left_margin);
623         if (var->right_margin > 255)
624                 printk(KERN_ERR "%s: invalid right_margin %d\n",
625                         info->fix.id, var->right_margin);
626         if (var->yres < 1 || var->yres > 511)
627                 printk(KERN_ERR "%s: invalid yres %d\n",
628                         info->fix.id, var->yres);
629         if (var->vsync_len > 100)
630                 printk(KERN_ERR "%s: invalid vsync_len %d\n",
631                         info->fix.id, var->vsync_len);
632         if (var->upper_margin > 63)
633                 printk(KERN_ERR "%s: invalid upper_margin %d\n",
634                         info->fix.id, var->upper_margin);
635         if (var->lower_margin > 255)
636                 printk(KERN_ERR "%s: invalid lower_margin %d\n",
637                         info->fix.id, var->lower_margin);
638 #endif
639
640         /* physical screen start address            */
641         writel(VPW_VPW(var->xres * var->bits_per_pixel / 8 / 4),
642                 fbi->regs + LCDC_VPW);
643
644         writel(HCR_H_WIDTH(var->hsync_len - 1) |
645                 HCR_H_WAIT_1(var->right_margin - 1) |
646                 HCR_H_WAIT_2(var->left_margin - 3),
647                 fbi->regs + LCDC_HCR);
648
649         writel(VCR_V_WIDTH(var->vsync_len) |
650                 VCR_V_WAIT_1(var->lower_margin) |
651                 VCR_V_WAIT_2(var->upper_margin),
652                 fbi->regs + LCDC_VCR);
653
654         writel(SIZE_XMAX(var->xres) | SIZE_YMAX(var->yres),
655                         fbi->regs + LCDC_SIZE);
656
657         writel(fbi->pcr, fbi->regs + LCDC_PCR);
658 #ifndef PWMR_BACKLIGHT_AVAILABLE
659         writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
660 #endif
661         writel(fbi->lscr1, fbi->regs + LCDC_LSCR1);
662         writel(fbi->dmacr, fbi->regs + LCDC_DMACR);
663
664         return 0;
665 }
666
667 #ifdef CONFIG_PM
668 /*
669  * Power management hooks.  Note that we won't be called from IRQ context,
670  * unlike the blank functions above, so we may sleep.
671  */
672 static int imxfb_suspend(struct platform_device *dev, pm_message_t state)
673 {
674         struct fb_info *info = platform_get_drvdata(dev);
675         struct imxfb_info *fbi = info->par;
676
677         pr_debug("%s\n", __func__);
678
679         imxfb_disable_controller(fbi);
680         return 0;
681 }
682
683 static int imxfb_resume(struct platform_device *dev)
684 {
685         struct fb_info *info = platform_get_drvdata(dev);
686         struct imxfb_info *fbi = info->par;
687
688         pr_debug("%s\n", __func__);
689
690         imxfb_enable_controller(fbi);
691         return 0;
692 }
693 #else
694 #define imxfb_suspend   NULL
695 #define imxfb_resume    NULL
696 #endif
697
698 static int __init imxfb_init_fbinfo(struct platform_device *pdev)
699 {
700         struct imx_fb_platform_data *pdata = pdev->dev.platform_data;
701         struct fb_info *info = dev_get_drvdata(&pdev->dev);
702         struct imxfb_info *fbi = info->par;
703         struct imx_fb_videomode *m;
704         int i;
705
706         pr_debug("%s\n",__func__);
707
708         info->pseudo_palette = kmalloc(sizeof(u32) * 16, GFP_KERNEL);
709         if (!info->pseudo_palette)
710                 return -ENOMEM;
711
712         memset(fbi, 0, sizeof(struct imxfb_info));
713
714         strlcpy(info->fix.id, IMX_NAME, sizeof(info->fix.id));
715
716         info->fix.type                  = FB_TYPE_PACKED_PIXELS;
717         info->fix.type_aux              = 0;
718         info->fix.xpanstep              = 0;
719         info->fix.ypanstep              = 0;
720         info->fix.ywrapstep             = 0;
721         info->fix.accel                 = FB_ACCEL_NONE;
722
723         info->var.nonstd                = 0;
724         info->var.activate              = FB_ACTIVATE_NOW;
725         info->var.height                = -1;
726         info->var.width = -1;
727         info->var.accel_flags           = 0;
728         info->var.vmode                 = FB_VMODE_NONINTERLACED;
729
730         info->fbops                     = &imxfb_ops;
731         info->flags                     = FBINFO_FLAG_DEFAULT |
732                                           FBINFO_READS_FAST;
733         info->var.grayscale             = pdata->cmap_greyscale;
734         fbi->cmap_inverse               = pdata->cmap_inverse;
735         fbi->cmap_static                = pdata->cmap_static;
736         fbi->lscr1                      = pdata->lscr1;
737         fbi->dmacr                      = pdata->dmacr;
738         fbi->pwmr                       = pdata->pwmr;
739         fbi->lcd_power                  = pdata->lcd_power;
740         fbi->backlight_power            = pdata->backlight_power;
741
742         for (i = 0, m = &pdata->mode[0]; i < pdata->num_modes; i++, m++)
743                 info->fix.smem_len = max_t(size_t, info->fix.smem_len,
744                                 m->mode.xres * m->mode.yres * m->bpp / 8);
745
746         return 0;
747 }
748
749 static int __init imxfb_probe(struct platform_device *pdev)
750 {
751         struct imxfb_info *fbi;
752         struct fb_info *info;
753         struct imx_fb_platform_data *pdata;
754         struct resource *res;
755         int ret, i;
756
757         dev_info(&pdev->dev, "i.MX Framebuffer driver\n");
758
759         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
760         if (!res)
761                 return -ENODEV;
762
763         pdata = pdev->dev.platform_data;
764         if (!pdata) {
765                 dev_err(&pdev->dev,"No platform_data available\n");
766                 return -ENOMEM;
767         }
768
769         info = framebuffer_alloc(sizeof(struct imxfb_info), &pdev->dev);
770         if (!info)
771                 return -ENOMEM;
772
773         fbi = info->par;
774
775         if (!fb_mode)
776                 fb_mode = pdata->mode[0].mode.name;
777
778         platform_set_drvdata(pdev, info);
779
780         ret = imxfb_init_fbinfo(pdev);
781         if (ret < 0)
782                 goto failed_init;
783
784         res = request_mem_region(res->start, resource_size(res),
785                                 DRIVER_NAME);
786         if (!res) {
787                 ret = -EBUSY;
788                 goto failed_req;
789         }
790
791         fbi->clk = clk_get(&pdev->dev, NULL);
792         if (IS_ERR(fbi->clk)) {
793                 ret = PTR_ERR(fbi->clk);
794                 dev_err(&pdev->dev, "unable to get clock: %d\n", ret);
795                 goto failed_getclock;
796         }
797
798         fbi->regs = ioremap(res->start, resource_size(res));
799         if (fbi->regs == NULL) {
800                 dev_err(&pdev->dev, "Cannot map frame buffer registers\n");
801                 goto failed_ioremap;
802         }
803
804         if (!pdata->fixed_screen_cpu) {
805                 fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
806                 fbi->map_cpu = dma_alloc_writecombine(&pdev->dev,
807                                 fbi->map_size, &fbi->map_dma, GFP_KERNEL);
808
809                 if (!fbi->map_cpu) {
810                         dev_err(&pdev->dev, "Failed to allocate video RAM: %d\n", ret);
811                         ret = -ENOMEM;
812                         goto failed_map;
813                 }
814
815                 info->screen_base = fbi->map_cpu;
816                 fbi->screen_cpu = fbi->map_cpu;
817                 fbi->screen_dma = fbi->map_dma;
818                 info->fix.smem_start = fbi->screen_dma;
819         } else {
820                 /* Fixed framebuffer mapping enables location of the screen in eSRAM */
821                 fbi->map_cpu = pdata->fixed_screen_cpu;
822                 fbi->map_dma = pdata->fixed_screen_dma;
823                 info->screen_base = fbi->map_cpu;
824                 fbi->screen_cpu = fbi->map_cpu;
825                 fbi->screen_dma = fbi->map_dma;
826                 info->fix.smem_start = fbi->screen_dma;
827         }
828
829         if (pdata->init) {
830                 ret = pdata->init(fbi->pdev);
831                 if (ret)
832                         goto failed_platform_init;
833         }
834
835         fbi->mode = pdata->mode;
836         fbi->num_modes = pdata->num_modes;
837
838         INIT_LIST_HEAD(&info->modelist);
839         for (i = 0; i < pdata->num_modes; i++)
840                 fb_add_videomode(&pdata->mode[i].mode, &info->modelist);
841
842         /*
843          * This makes sure that our colour bitfield
844          * descriptors are correctly initialised.
845          */
846         imxfb_check_var(&info->var, info);
847
848         ret = fb_alloc_cmap(&info->cmap, 1 << info->var.bits_per_pixel, 0);
849         if (ret < 0)
850                 goto failed_cmap;
851
852         imxfb_set_par(info);
853         ret = register_framebuffer(info);
854         if (ret < 0) {
855                 dev_err(&pdev->dev, "failed to register framebuffer\n");
856                 goto failed_register;
857         }
858
859         imxfb_enable_controller(fbi);
860         fbi->pdev = pdev;
861 #ifdef PWMR_BACKLIGHT_AVAILABLE
862         imxfb_init_backlight(fbi);
863 #endif
864
865         return 0;
866
867 failed_register:
868         fb_dealloc_cmap(&info->cmap);
869 failed_cmap:
870         if (pdata->exit)
871                 pdata->exit(fbi->pdev);
872 failed_platform_init:
873         if (!pdata->fixed_screen_cpu)
874                 dma_free_writecombine(&pdev->dev,fbi->map_size,fbi->map_cpu,
875                         fbi->map_dma);
876 failed_map:
877         clk_put(fbi->clk);
878 failed_getclock:
879         iounmap(fbi->regs);
880 failed_ioremap:
881         release_mem_region(res->start, resource_size(res));
882 failed_req:
883         kfree(info->pseudo_palette);
884 failed_init:
885         platform_set_drvdata(pdev, NULL);
886         framebuffer_release(info);
887         return ret;
888 }
889
890 static int __devexit imxfb_remove(struct platform_device *pdev)
891 {
892         struct imx_fb_platform_data *pdata;
893         struct fb_info *info = platform_get_drvdata(pdev);
894         struct imxfb_info *fbi = info->par;
895         struct resource *res;
896
897         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
898
899         imxfb_disable_controller(fbi);
900
901 #ifdef PWMR_BACKLIGHT_AVAILABLE
902         imxfb_exit_backlight(fbi);
903 #endif
904         unregister_framebuffer(info);
905
906         pdata = pdev->dev.platform_data;
907         if (pdata->exit)
908                 pdata->exit(fbi->pdev);
909
910         fb_dealloc_cmap(&info->cmap);
911         kfree(info->pseudo_palette);
912         framebuffer_release(info);
913
914         iounmap(fbi->regs);
915         release_mem_region(res->start, resource_size(res));
916         clk_disable(fbi->clk);
917         clk_put(fbi->clk);
918
919         platform_set_drvdata(pdev, NULL);
920
921         return 0;
922 }
923
924 void  imxfb_shutdown(struct platform_device * dev)
925 {
926         struct fb_info *info = platform_get_drvdata(dev);
927         struct imxfb_info *fbi = info->par;
928         imxfb_disable_controller(fbi);
929 }
930
931 static struct platform_driver imxfb_driver = {
932         .suspend        = imxfb_suspend,
933         .resume         = imxfb_resume,
934         .remove         = __devexit_p(imxfb_remove),
935         .shutdown       = imxfb_shutdown,
936         .driver         = {
937                 .name   = DRIVER_NAME,
938         },
939 };
940
941 static int imxfb_setup(void)
942 {
943 #ifndef MODULE
944         char *opt, *options = NULL;
945
946         if (fb_get_options("imxfb", &options))
947                 return -ENODEV;
948
949         if (!options || !*options)
950                 return 0;
951
952         while ((opt = strsep(&options, ",")) != NULL) {
953                 if (!*opt)
954                         continue;
955                 else
956                         fb_mode = opt;
957         }
958 #endif
959         return 0;
960 }
961
962 int __init imxfb_init(void)
963 {
964         int ret = imxfb_setup();
965
966         if (ret < 0)
967                 return ret;
968
969         return platform_driver_probe(&imxfb_driver, imxfb_probe);
970 }
971
972 static void __exit imxfb_cleanup(void)
973 {
974         platform_driver_unregister(&imxfb_driver);
975 }
976
977 module_init(imxfb_init);
978 module_exit(imxfb_cleanup);
979
980 MODULE_DESCRIPTION("Motorola i.MX framebuffer driver");
981 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
982 MODULE_LICENSE("GPL");