drivers/video/backlight/adp8860_bl.c: remove a redundant assignment for max_brightness
[linux-2.6.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 #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. */
117 static const char *fb_mode;
118
119
120 /*
121  * These are the bitfields for each
122  * display depth that we support.
123  */
124 struct imxfb_rgb {
125         struct fb_bitfield      red;
126         struct fb_bitfield      green;
127         struct fb_bitfield      blue;
128         struct fb_bitfield      transp;
129 };
130
131 struct imxfb_info {
132         struct platform_device  *pdev;
133         void __iomem            *regs;
134         struct clk              *clk;
135
136         /*
137          * These are the addresses we mapped
138          * the framebuffer memory region to.
139          */
140         dma_addr_t              map_dma;
141         u_char                  *map_cpu;
142         u_int                   map_size;
143
144         u_char                  *screen_cpu;
145         dma_addr_t              screen_dma;
146         u_int                   palette_size;
147
148         dma_addr_t              dbar1;
149         dma_addr_t              dbar2;
150
151         u_int                   pcr;
152         u_int                   pwmr;
153         u_int                   lscr1;
154         u_int                   dmacr;
155         u_int                   cmap_inverse:1,
156                                 cmap_static:1,
157                                 unused:30;
158
159         struct imx_fb_videomode *mode;
160         int                     num_modes;
161 #ifdef PWMR_BACKLIGHT_AVAILABLE
162         struct backlight_device *bl;
163 #endif
164
165         void (*lcd_power)(int);
166         void (*backlight_power)(int);
167 };
168
169 #define IMX_NAME        "IMX"
170
171 /*
172  * Minimum X and Y resolutions
173  */
174 #define MIN_XRES        64
175 #define MIN_YRES        64
176
177 /* Actually this really is 18bit support, the lowest 2 bits of each colour
178  * are unused in hardware. We claim to have 24bit support to make software
179  * like X work, which does not support 18bit.
180  */
181 static struct imxfb_rgb def_rgb_18 = {
182         .red    = {.offset = 16, .length = 8,},
183         .green  = {.offset = 8, .length = 8,},
184         .blue   = {.offset = 0, .length = 8,},
185         .transp = {.offset = 0, .length = 0,},
186 };
187
188 static struct imxfb_rgb def_rgb_16_tft = {
189         .red    = {.offset = 11, .length = 5,},
190         .green  = {.offset = 5, .length = 6,},
191         .blue   = {.offset = 0, .length = 5,},
192         .transp = {.offset = 0, .length = 0,},
193 };
194
195 static struct imxfb_rgb def_rgb_16_stn = {
196         .red    = {.offset = 8, .length = 4,},
197         .green  = {.offset = 4, .length = 4,},
198         .blue   = {.offset = 0, .length = 4,},
199         .transp = {.offset = 0, .length = 0,},
200 };
201
202 static struct imxfb_rgb def_rgb_8 = {
203         .red    = {.offset = 0, .length = 8,},
204         .green  = {.offset = 0, .length = 8,},
205         .blue   = {.offset = 0, .length = 8,},
206         .transp = {.offset = 0, .length = 0,},
207 };
208
209 static int imxfb_activate_var(struct fb_var_screeninfo *var,
210                 struct fb_info *info);
211
212 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
213 {
214         chan &= 0xffff;
215         chan >>= 16 - bf->length;
216         return chan << bf->offset;
217 }
218
219 static int imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
220                 u_int trans, struct fb_info *info)
221 {
222         struct imxfb_info *fbi = info->par;
223         u_int val, ret = 1;
224
225 #define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
226         if (regno < fbi->palette_size) {
227                 val = (CNVT_TOHW(red, 4) << 8) |
228                       (CNVT_TOHW(green,4) << 4) |
229                       CNVT_TOHW(blue,  4);
230
231                 writel(val, fbi->regs + 0x800 + (regno << 2));
232                 ret = 0;
233         }
234         return ret;
235 }
236
237 static int imxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
238                    u_int trans, struct fb_info *info)
239 {
240         struct imxfb_info *fbi = info->par;
241         unsigned int val;
242         int ret = 1;
243
244         /*
245          * If inverse mode was selected, invert all the colours
246          * rather than the register number.  The register number
247          * is what you poke into the framebuffer to produce the
248          * colour you requested.
249          */
250         if (fbi->cmap_inverse) {
251                 red   = 0xffff - red;
252                 green = 0xffff - green;
253                 blue  = 0xffff - blue;
254         }
255
256         /*
257          * If greyscale is true, then we convert the RGB value
258          * to greyscale no mater what visual we are using.
259          */
260         if (info->var.grayscale)
261                 red = green = blue = (19595 * red + 38470 * green +
262                                         7471 * blue) >> 16;
263
264         switch (info->fix.visual) {
265         case FB_VISUAL_TRUECOLOR:
266                 /*
267                  * 12 or 16-bit True Colour.  We encode the RGB value
268                  * according to the RGB bitfield information.
269                  */
270                 if (regno < 16) {
271                         u32 *pal = info->pseudo_palette;
272
273                         val  = chan_to_field(red, &info->var.red);
274                         val |= chan_to_field(green, &info->var.green);
275                         val |= chan_to_field(blue, &info->var.blue);
276
277                         pal[regno] = val;
278                         ret = 0;
279                 }
280                 break;
281
282         case FB_VISUAL_STATIC_PSEUDOCOLOR:
283         case FB_VISUAL_PSEUDOCOLOR:
284                 ret = imxfb_setpalettereg(regno, red, green, blue, trans, info);
285                 break;
286         }
287
288         return ret;
289 }
290
291 static const struct imx_fb_videomode *imxfb_find_mode(struct imxfb_info *fbi)
292 {
293         struct imx_fb_videomode *m;
294         int i;
295
296         for (i = 0, m = &fbi->mode[0]; i < fbi->num_modes; i++, m++) {
297                 if (!strcmp(m->mode.name, fb_mode))
298                         return m;
299         }
300         return NULL;
301 }
302
303 /*
304  *  imxfb_check_var():
305  *    Round up in the following order: bits_per_pixel, xres,
306  *    yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
307  *    bitfields, horizontal timing, vertical timing.
308  */
309 static int imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
310 {
311         struct imxfb_info *fbi = info->par;
312         struct imxfb_rgb *rgb;
313         const struct imx_fb_videomode *imxfb_mode;
314         unsigned long lcd_clk;
315         unsigned long long tmp;
316         u32 pcr = 0;
317
318         if (var->xres < MIN_XRES)
319                 var->xres = MIN_XRES;
320         if (var->yres < MIN_YRES)
321                 var->yres = MIN_YRES;
322
323         imxfb_mode = imxfb_find_mode(fbi);
324         if (!imxfb_mode)
325                 return -EINVAL;
326
327         var->xres               = imxfb_mode->mode.xres;
328         var->yres               = imxfb_mode->mode.yres;
329         var->bits_per_pixel     = imxfb_mode->bpp;
330         var->pixclock           = imxfb_mode->mode.pixclock;
331         var->hsync_len          = imxfb_mode->mode.hsync_len;
332         var->left_margin        = imxfb_mode->mode.left_margin;
333         var->right_margin       = imxfb_mode->mode.right_margin;
334         var->vsync_len          = imxfb_mode->mode.vsync_len;
335         var->upper_margin       = imxfb_mode->mode.upper_margin;
336         var->lower_margin       = imxfb_mode->mode.lower_margin;
337         var->sync               = imxfb_mode->mode.sync;
338         var->xres_virtual       = max(var->xres_virtual, var->xres);
339         var->yres_virtual       = max(var->yres_virtual, var->yres);
340
341         pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel);
342
343         lcd_clk = clk_get_rate(fbi->clk);
344
345         tmp = var->pixclock * (unsigned long long)lcd_clk;
346
347         do_div(tmp, 1000000);
348
349         if (do_div(tmp, 1000000) > 500000)
350                 tmp++;
351
352         pcr = (unsigned int)tmp;
353
354         if (--pcr > 0x3F) {
355                 pcr = 0x3F;
356                 printk(KERN_WARNING "Must limit pixel clock to %luHz\n",
357                                 lcd_clk / pcr);
358         }
359
360         switch (var->bits_per_pixel) {
361         case 32:
362                 pcr |= PCR_BPIX_18;
363                 rgb = &def_rgb_18;
364                 break;
365         case 16:
366         default:
367                 if (cpu_is_mx1())
368                         pcr |= PCR_BPIX_12;
369                 else
370                         pcr |= PCR_BPIX_16;
371
372                 if (imxfb_mode->pcr & PCR_TFT)
373                         rgb = &def_rgb_16_tft;
374                 else
375                         rgb = &def_rgb_16_stn;
376                 break;
377         case 8:
378                 pcr |= PCR_BPIX_8;
379                 rgb = &def_rgb_8;
380                 break;
381         }
382
383         /* add sync polarities */
384         pcr |= imxfb_mode->pcr & ~(0x3f | (7 << 25));
385
386         fbi->pcr = pcr;
387
388         /*
389          * Copy the RGB parameters for this display
390          * from the machine specific parameters.
391          */
392         var->red    = rgb->red;
393         var->green  = rgb->green;
394         var->blue   = rgb->blue;
395         var->transp = rgb->transp;
396
397         pr_debug("RGBT length = %d:%d:%d:%d\n",
398                 var->red.length, var->green.length, var->blue.length,
399                 var->transp.length);
400
401         pr_debug("RGBT offset = %d:%d:%d:%d\n",
402                 var->red.offset, var->green.offset, var->blue.offset,
403                 var->transp.offset);
404
405         return 0;
406 }
407
408 /*
409  * imxfb_set_par():
410  *      Set the user defined part of the display for the specified console
411  */
412 static int imxfb_set_par(struct fb_info *info)
413 {
414         struct imxfb_info *fbi = info->par;
415         struct fb_var_screeninfo *var = &info->var;
416
417         if (var->bits_per_pixel == 16 || var->bits_per_pixel == 32)
418                 info->fix.visual = FB_VISUAL_TRUECOLOR;
419         else if (!fbi->cmap_static)
420                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
421         else {
422                 /*
423                  * Some people have weird ideas about wanting static
424                  * pseudocolor maps.  I suspect their user space
425                  * applications are broken.
426                  */
427                 info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
428         }
429
430         info->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8;
431         fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16;
432
433         imxfb_activate_var(var, info);
434
435         return 0;
436 }
437
438 #ifdef PWMR_BACKLIGHT_AVAILABLE
439 static int imxfb_bl_get_brightness(struct backlight_device *bl)
440 {
441         struct imxfb_info *fbi = bl_get_data(bl);
442
443         return readl(fbi->regs + LCDC_PWMR) & 0xFF;
444 }
445
446 static int imxfb_bl_update_status(struct backlight_device *bl)
447 {
448         struct imxfb_info *fbi = bl_get_data(bl);
449         int brightness = bl->props.brightness;
450
451         if (bl->props.power != FB_BLANK_UNBLANK)
452                 brightness = 0;
453         if (bl->props.fb_blank != FB_BLANK_UNBLANK)
454                 brightness = 0;
455
456         fbi->pwmr = (fbi->pwmr & ~0xFF) | brightness;
457
458         if (bl->props.fb_blank != FB_BLANK_UNBLANK)
459                 clk_enable(fbi->clk);
460         writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
461         if (bl->props.fb_blank != FB_BLANK_UNBLANK)
462                 clk_disable(fbi->clk);
463
464         return 0;
465 }
466
467 static const struct backlight_ops imxfb_lcdc_bl_ops = {
468         .update_status = imxfb_bl_update_status,
469         .get_brightness = imxfb_bl_get_brightness,
470 };
471
472 static void imxfb_init_backlight(struct imxfb_info *fbi)
473 {
474         struct backlight_properties props;
475         struct backlight_device *bl;
476
477         if (fbi->bl)
478                 return;
479
480         memset(&props, 0, sizeof(struct backlight_properties));
481         props.max_brightness = 0xff;
482         props.type = BACKLIGHT_RAW;
483         writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
484
485         bl = backlight_device_register("imxfb-bl", &fbi->pdev->dev, fbi,
486                                        &imxfb_lcdc_bl_ops, &props);
487         if (IS_ERR(bl)) {
488                 dev_err(&fbi->pdev->dev, "error %ld on backlight register\n",
489                                 PTR_ERR(bl));
490                 return;
491         }
492
493         fbi->bl = bl;
494         bl->props.power = FB_BLANK_UNBLANK;
495         bl->props.fb_blank = FB_BLANK_UNBLANK;
496         bl->props.brightness = imxfb_bl_get_brightness(bl);
497 }
498
499 static void imxfb_exit_backlight(struct imxfb_info *fbi)
500 {
501         if (fbi->bl)
502                 backlight_device_unregister(fbi->bl);
503 }
504 #endif
505
506 static void imxfb_enable_controller(struct imxfb_info *fbi)
507 {
508         pr_debug("Enabling LCD controller\n");
509
510         writel(fbi->screen_dma, fbi->regs + LCDC_SSA);
511
512         /* panning offset 0 (0 pixel offset)        */
513         writel(0x00000000, fbi->regs + LCDC_POS);
514
515         /* disable hardware cursor */
516         writel(readl(fbi->regs + LCDC_CPOS) & ~(CPOS_CC0 | CPOS_CC1),
517                 fbi->regs + LCDC_CPOS);
518
519         /*
520          * RMCR_LCDC_EN_MX1 is present on i.MX1 only, but doesn't hurt
521          * on other SoCs
522          */
523         writel(RMCR_LCDC_EN_MX1, fbi->regs + LCDC_RMCR);
524
525         clk_enable(fbi->clk);
526
527         if (fbi->backlight_power)
528                 fbi->backlight_power(1);
529         if (fbi->lcd_power)
530                 fbi->lcd_power(1);
531 }
532
533 static void imxfb_disable_controller(struct imxfb_info *fbi)
534 {
535         pr_debug("Disabling LCD controller\n");
536
537         if (fbi->backlight_power)
538                 fbi->backlight_power(0);
539         if (fbi->lcd_power)
540                 fbi->lcd_power(0);
541
542         clk_disable(fbi->clk);
543
544         writel(0, fbi->regs + LCDC_RMCR);
545 }
546
547 static int imxfb_blank(int blank, struct fb_info *info)
548 {
549         struct imxfb_info *fbi = info->par;
550
551         pr_debug("imxfb_blank: blank=%d\n", blank);
552
553         switch (blank) {
554         case FB_BLANK_POWERDOWN:
555         case FB_BLANK_VSYNC_SUSPEND:
556         case FB_BLANK_HSYNC_SUSPEND:
557         case FB_BLANK_NORMAL:
558                 imxfb_disable_controller(fbi);
559                 break;
560
561         case FB_BLANK_UNBLANK:
562                 imxfb_enable_controller(fbi);
563                 break;
564         }
565         return 0;
566 }
567
568 static struct fb_ops imxfb_ops = {
569         .owner          = THIS_MODULE,
570         .fb_check_var   = imxfb_check_var,
571         .fb_set_par     = imxfb_set_par,
572         .fb_setcolreg   = imxfb_setcolreg,
573         .fb_fillrect    = cfb_fillrect,
574         .fb_copyarea    = cfb_copyarea,
575         .fb_imageblit   = cfb_imageblit,
576         .fb_blank       = imxfb_blank,
577 };
578
579 /*
580  * imxfb_activate_var():
581  *      Configures LCD Controller based on entries in var parameter.  Settings are
582  *      only written to the controller if changes were made.
583  */
584 static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info)
585 {
586         struct imxfb_info *fbi = info->par;
587
588         pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",
589                 var->xres, var->hsync_len,
590                 var->left_margin, var->right_margin);
591         pr_debug("var: yres=%d vslen=%d um=%d bm=%d\n",
592                 var->yres, var->vsync_len,
593                 var->upper_margin, var->lower_margin);
594
595 #if DEBUG_VAR
596         if (var->xres < 16        || var->xres > 1024)
597                 printk(KERN_ERR "%s: invalid xres %d\n",
598                         info->fix.id, var->xres);
599         if (var->hsync_len < 1    || var->hsync_len > 64)
600                 printk(KERN_ERR "%s: invalid hsync_len %d\n",
601                         info->fix.id, var->hsync_len);
602         if (var->left_margin > 255)
603                 printk(KERN_ERR "%s: invalid left_margin %d\n",
604                         info->fix.id, var->left_margin);
605         if (var->right_margin > 255)
606                 printk(KERN_ERR "%s: invalid right_margin %d\n",
607                         info->fix.id, var->right_margin);
608         if (var->yres < 1 || var->yres > YMAX_MASK)
609                 printk(KERN_ERR "%s: invalid yres %d\n",
610                         info->fix.id, var->yres);
611         if (var->vsync_len > 100)
612                 printk(KERN_ERR "%s: invalid vsync_len %d\n",
613                         info->fix.id, var->vsync_len);
614         if (var->upper_margin > 63)
615                 printk(KERN_ERR "%s: invalid upper_margin %d\n",
616                         info->fix.id, var->upper_margin);
617         if (var->lower_margin > 255)
618                 printk(KERN_ERR "%s: invalid lower_margin %d\n",
619                         info->fix.id, var->lower_margin);
620 #endif
621
622         /* physical screen start address            */
623         writel(VPW_VPW(var->xres * var->bits_per_pixel / 8 / 4),
624                 fbi->regs + LCDC_VPW);
625
626         writel(HCR_H_WIDTH(var->hsync_len - 1) |
627                 HCR_H_WAIT_1(var->right_margin - 1) |
628                 HCR_H_WAIT_2(var->left_margin - 3),
629                 fbi->regs + LCDC_HCR);
630
631         writel(VCR_V_WIDTH(var->vsync_len) |
632                 VCR_V_WAIT_1(var->lower_margin) |
633                 VCR_V_WAIT_2(var->upper_margin),
634                 fbi->regs + LCDC_VCR);
635
636         writel(SIZE_XMAX(var->xres) | SIZE_YMAX(var->yres),
637                         fbi->regs + LCDC_SIZE);
638
639         writel(fbi->pcr, fbi->regs + LCDC_PCR);
640 #ifndef PWMR_BACKLIGHT_AVAILABLE
641         writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
642 #endif
643         writel(fbi->lscr1, fbi->regs + LCDC_LSCR1);
644         writel(fbi->dmacr, fbi->regs + LCDC_DMACR);
645
646         return 0;
647 }
648
649 #ifdef CONFIG_PM
650 /*
651  * Power management hooks.  Note that we won't be called from IRQ context,
652  * unlike the blank functions above, so we may sleep.
653  */
654 static int imxfb_suspend(struct platform_device *dev, pm_message_t state)
655 {
656         struct fb_info *info = platform_get_drvdata(dev);
657         struct imxfb_info *fbi = info->par;
658
659         pr_debug("%s\n", __func__);
660
661         imxfb_disable_controller(fbi);
662         return 0;
663 }
664
665 static int imxfb_resume(struct platform_device *dev)
666 {
667         struct fb_info *info = platform_get_drvdata(dev);
668         struct imxfb_info *fbi = info->par;
669
670         pr_debug("%s\n", __func__);
671
672         imxfb_enable_controller(fbi);
673         return 0;
674 }
675 #else
676 #define imxfb_suspend   NULL
677 #define imxfb_resume    NULL
678 #endif
679
680 static int __init imxfb_init_fbinfo(struct platform_device *pdev)
681 {
682         struct imx_fb_platform_data *pdata = pdev->dev.platform_data;
683         struct fb_info *info = dev_get_drvdata(&pdev->dev);
684         struct imxfb_info *fbi = info->par;
685         struct imx_fb_videomode *m;
686         int i;
687
688         pr_debug("%s\n",__func__);
689
690         info->pseudo_palette = kmalloc(sizeof(u32) * 16, GFP_KERNEL);
691         if (!info->pseudo_palette)
692                 return -ENOMEM;
693
694         memset(fbi, 0, sizeof(struct imxfb_info));
695
696         strlcpy(info->fix.id, IMX_NAME, sizeof(info->fix.id));
697
698         info->fix.type                  = FB_TYPE_PACKED_PIXELS;
699         info->fix.type_aux              = 0;
700         info->fix.xpanstep              = 0;
701         info->fix.ypanstep              = 0;
702         info->fix.ywrapstep             = 0;
703         info->fix.accel                 = FB_ACCEL_NONE;
704
705         info->var.nonstd                = 0;
706         info->var.activate              = FB_ACTIVATE_NOW;
707         info->var.height                = -1;
708         info->var.width = -1;
709         info->var.accel_flags           = 0;
710         info->var.vmode                 = FB_VMODE_NONINTERLACED;
711
712         info->fbops                     = &imxfb_ops;
713         info->flags                     = FBINFO_FLAG_DEFAULT |
714                                           FBINFO_READS_FAST;
715         info->var.grayscale             = pdata->cmap_greyscale;
716         fbi->cmap_inverse               = pdata->cmap_inverse;
717         fbi->cmap_static                = pdata->cmap_static;
718         fbi->lscr1                      = pdata->lscr1;
719         fbi->dmacr                      = pdata->dmacr;
720         fbi->pwmr                       = pdata->pwmr;
721         fbi->lcd_power                  = pdata->lcd_power;
722         fbi->backlight_power            = pdata->backlight_power;
723
724         for (i = 0, m = &pdata->mode[0]; i < pdata->num_modes; i++, m++)
725                 info->fix.smem_len = max_t(size_t, info->fix.smem_len,
726                                 m->mode.xres * m->mode.yres * m->bpp / 8);
727
728         return 0;
729 }
730
731 static int __init imxfb_probe(struct platform_device *pdev)
732 {
733         struct imxfb_info *fbi;
734         struct fb_info *info;
735         struct imx_fb_platform_data *pdata;
736         struct resource *res;
737         int ret, i;
738
739         dev_info(&pdev->dev, "i.MX Framebuffer driver\n");
740
741         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
742         if (!res)
743                 return -ENODEV;
744
745         pdata = pdev->dev.platform_data;
746         if (!pdata) {
747                 dev_err(&pdev->dev,"No platform_data available\n");
748                 return -ENOMEM;
749         }
750
751         info = framebuffer_alloc(sizeof(struct imxfb_info), &pdev->dev);
752         if (!info)
753                 return -ENOMEM;
754
755         fbi = info->par;
756
757         if (!fb_mode)
758                 fb_mode = pdata->mode[0].mode.name;
759
760         platform_set_drvdata(pdev, info);
761
762         ret = imxfb_init_fbinfo(pdev);
763         if (ret < 0)
764                 goto failed_init;
765
766         res = request_mem_region(res->start, resource_size(res),
767                                 DRIVER_NAME);
768         if (!res) {
769                 ret = -EBUSY;
770                 goto failed_req;
771         }
772
773         fbi->clk = clk_get(&pdev->dev, NULL);
774         if (IS_ERR(fbi->clk)) {
775                 ret = PTR_ERR(fbi->clk);
776                 dev_err(&pdev->dev, "unable to get clock: %d\n", ret);
777                 goto failed_getclock;
778         }
779
780         fbi->regs = ioremap(res->start, resource_size(res));
781         if (fbi->regs == NULL) {
782                 dev_err(&pdev->dev, "Cannot map frame buffer registers\n");
783                 goto failed_ioremap;
784         }
785
786         if (!pdata->fixed_screen_cpu) {
787                 fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
788                 fbi->map_cpu = dma_alloc_writecombine(&pdev->dev,
789                                 fbi->map_size, &fbi->map_dma, GFP_KERNEL);
790
791                 if (!fbi->map_cpu) {
792                         dev_err(&pdev->dev, "Failed to allocate video RAM: %d\n", ret);
793                         ret = -ENOMEM;
794                         goto failed_map;
795                 }
796
797                 info->screen_base = fbi->map_cpu;
798                 fbi->screen_cpu = fbi->map_cpu;
799                 fbi->screen_dma = fbi->map_dma;
800                 info->fix.smem_start = fbi->screen_dma;
801         } else {
802                 /* Fixed framebuffer mapping enables location of the screen in eSRAM */
803                 fbi->map_cpu = pdata->fixed_screen_cpu;
804                 fbi->map_dma = pdata->fixed_screen_dma;
805                 info->screen_base = fbi->map_cpu;
806                 fbi->screen_cpu = fbi->map_cpu;
807                 fbi->screen_dma = fbi->map_dma;
808                 info->fix.smem_start = fbi->screen_dma;
809         }
810
811         if (pdata->init) {
812                 ret = pdata->init(fbi->pdev);
813                 if (ret)
814                         goto failed_platform_init;
815         }
816
817         fbi->mode = pdata->mode;
818         fbi->num_modes = pdata->num_modes;
819
820         INIT_LIST_HEAD(&info->modelist);
821         for (i = 0; i < pdata->num_modes; i++)
822                 fb_add_videomode(&pdata->mode[i].mode, &info->modelist);
823
824         /*
825          * This makes sure that our colour bitfield
826          * descriptors are correctly initialised.
827          */
828         imxfb_check_var(&info->var, info);
829
830         ret = fb_alloc_cmap(&info->cmap, 1 << info->var.bits_per_pixel, 0);
831         if (ret < 0)
832                 goto failed_cmap;
833
834         imxfb_set_par(info);
835         ret = register_framebuffer(info);
836         if (ret < 0) {
837                 dev_err(&pdev->dev, "failed to register framebuffer\n");
838                 goto failed_register;
839         }
840
841         imxfb_enable_controller(fbi);
842         fbi->pdev = pdev;
843 #ifdef PWMR_BACKLIGHT_AVAILABLE
844         imxfb_init_backlight(fbi);
845 #endif
846
847         return 0;
848
849 failed_register:
850         fb_dealloc_cmap(&info->cmap);
851 failed_cmap:
852         if (pdata->exit)
853                 pdata->exit(fbi->pdev);
854 failed_platform_init:
855         if (!pdata->fixed_screen_cpu)
856                 dma_free_writecombine(&pdev->dev,fbi->map_size,fbi->map_cpu,
857                         fbi->map_dma);
858 failed_map:
859         iounmap(fbi->regs);
860 failed_ioremap:
861         clk_put(fbi->clk);
862 failed_getclock:
863         release_mem_region(res->start, resource_size(res));
864 failed_req:
865         kfree(info->pseudo_palette);
866 failed_init:
867         platform_set_drvdata(pdev, NULL);
868         framebuffer_release(info);
869         return ret;
870 }
871
872 static int __devexit imxfb_remove(struct platform_device *pdev)
873 {
874         struct imx_fb_platform_data *pdata;
875         struct fb_info *info = platform_get_drvdata(pdev);
876         struct imxfb_info *fbi = info->par;
877         struct resource *res;
878
879         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
880
881         imxfb_disable_controller(fbi);
882
883 #ifdef PWMR_BACKLIGHT_AVAILABLE
884         imxfb_exit_backlight(fbi);
885 #endif
886         unregister_framebuffer(info);
887
888         pdata = pdev->dev.platform_data;
889         if (pdata->exit)
890                 pdata->exit(fbi->pdev);
891
892         fb_dealloc_cmap(&info->cmap);
893         kfree(info->pseudo_palette);
894         framebuffer_release(info);
895
896         iounmap(fbi->regs);
897         release_mem_region(res->start, resource_size(res));
898         clk_disable(fbi->clk);
899         clk_put(fbi->clk);
900
901         platform_set_drvdata(pdev, NULL);
902
903         return 0;
904 }
905
906 void  imxfb_shutdown(struct platform_device * dev)
907 {
908         struct fb_info *info = platform_get_drvdata(dev);
909         struct imxfb_info *fbi = info->par;
910         imxfb_disable_controller(fbi);
911 }
912
913 static struct platform_driver imxfb_driver = {
914         .suspend        = imxfb_suspend,
915         .resume         = imxfb_resume,
916         .remove         = __devexit_p(imxfb_remove),
917         .shutdown       = imxfb_shutdown,
918         .driver         = {
919                 .name   = DRIVER_NAME,
920         },
921 };
922
923 static int imxfb_setup(void)
924 {
925 #ifndef MODULE
926         char *opt, *options = NULL;
927
928         if (fb_get_options("imxfb", &options))
929                 return -ENODEV;
930
931         if (!options || !*options)
932                 return 0;
933
934         while ((opt = strsep(&options, ",")) != NULL) {
935                 if (!*opt)
936                         continue;
937                 else
938                         fb_mode = opt;
939         }
940 #endif
941         return 0;
942 }
943
944 int __init imxfb_init(void)
945 {
946         int ret = imxfb_setup();
947
948         if (ret < 0)
949                 return ret;
950
951         return platform_driver_probe(&imxfb_driver, imxfb_probe);
952 }
953
954 static void __exit imxfb_cleanup(void)
955 {
956         platform_driver_unregister(&imxfb_driver);
957 }
958
959 module_init(imxfb_init);
960 module_exit(imxfb_cleanup);
961
962 MODULE_DESCRIPTION("Freescale i.MX framebuffer driver");
963 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
964 MODULE_LICENSE("GPL");