Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm
[linux-2.6.git] / drivers / video / atmel_lcdfb.c
1 /*
2  *  Driver for AT91/AT32 LCD Controller
3  *
4  *  Copyright (C) 2007 Atmel Corporation
5  *
6  * This file is subject to the terms and conditions of the GNU General Public
7  * License.  See the file COPYING in the main directory of this archive for
8  * more details.
9  */
10
11 #include <linux/kernel.h>
12 #include <linux/platform_device.h>
13 #include <linux/dma-mapping.h>
14 #include <linux/interrupt.h>
15 #include <linux/clk.h>
16 #include <linux/fb.h>
17 #include <linux/init.h>
18 #include <linux/delay.h>
19 #include <linux/backlight.h>
20
21 #include <mach/board.h>
22 #include <mach/cpu.h>
23 #include <mach/gpio.h>
24
25 #include <video/atmel_lcdc.h>
26
27 #define lcdc_readl(sinfo, reg)          __raw_readl((sinfo)->mmio+(reg))
28 #define lcdc_writel(sinfo, reg, val)    __raw_writel((val), (sinfo)->mmio+(reg))
29
30 /* configurable parameters */
31 #define ATMEL_LCDC_CVAL_DEFAULT         0xc8
32 #define ATMEL_LCDC_DMA_BURST_LEN        8       /* words */
33 #define ATMEL_LCDC_FIFO_SIZE            512     /* words */
34
35 #if defined(CONFIG_ARCH_AT91)
36 #define ATMEL_LCDFB_FBINFO_DEFAULT      (FBINFO_DEFAULT \
37                                          | FBINFO_PARTIAL_PAN_OK \
38                                          | FBINFO_HWACCEL_YPAN)
39
40 static inline void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
41                                         struct fb_var_screeninfo *var)
42 {
43
44 }
45 #elif defined(CONFIG_AVR32)
46 #define ATMEL_LCDFB_FBINFO_DEFAULT      (FBINFO_DEFAULT \
47                                         | FBINFO_PARTIAL_PAN_OK \
48                                         | FBINFO_HWACCEL_XPAN \
49                                         | FBINFO_HWACCEL_YPAN)
50
51 static void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
52                                      struct fb_var_screeninfo *var)
53 {
54         u32 dma2dcfg;
55         u32 pixeloff;
56
57         pixeloff = (var->xoffset * var->bits_per_pixel) & 0x1f;
58
59         dma2dcfg = ((var->xres_virtual - var->xres) * var->bits_per_pixel) / 8;
60         dma2dcfg |= pixeloff << ATMEL_LCDC_PIXELOFF_OFFSET;
61         lcdc_writel(sinfo, ATMEL_LCDC_DMA2DCFG, dma2dcfg);
62
63         /* Update configuration */
64         lcdc_writel(sinfo, ATMEL_LCDC_DMACON,
65                     lcdc_readl(sinfo, ATMEL_LCDC_DMACON)
66                     | ATMEL_LCDC_DMAUPDT);
67 }
68 #endif
69
70 static const u32 contrast_ctr = ATMEL_LCDC_PS_DIV8
71                 | ATMEL_LCDC_POL_POSITIVE
72                 | ATMEL_LCDC_ENA_PWMENABLE;
73
74 #ifdef CONFIG_BACKLIGHT_ATMEL_LCDC
75
76 /* some bl->props field just changed */
77 static int atmel_bl_update_status(struct backlight_device *bl)
78 {
79         struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
80         int                     power = sinfo->bl_power;
81         int                     brightness = bl->props.brightness;
82
83         /* REVISIT there may be a meaningful difference between
84          * fb_blank and power ... there seem to be some cases
85          * this doesn't handle correctly.
86          */
87         if (bl->props.fb_blank != sinfo->bl_power)
88                 power = bl->props.fb_blank;
89         else if (bl->props.power != sinfo->bl_power)
90                 power = bl->props.power;
91
92         if (brightness < 0 && power == FB_BLANK_UNBLANK)
93                 brightness = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
94         else if (power != FB_BLANK_UNBLANK)
95                 brightness = 0;
96
97         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, brightness);
98         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR,
99                         brightness ? contrast_ctr : 0);
100
101         bl->props.fb_blank = bl->props.power = sinfo->bl_power = power;
102
103         return 0;
104 }
105
106 static int atmel_bl_get_brightness(struct backlight_device *bl)
107 {
108         struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
109
110         return lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
111 }
112
113 static struct backlight_ops atmel_lcdc_bl_ops = {
114         .update_status = atmel_bl_update_status,
115         .get_brightness = atmel_bl_get_brightness,
116 };
117
118 static void init_backlight(struct atmel_lcdfb_info *sinfo)
119 {
120         struct backlight_device *bl;
121
122         sinfo->bl_power = FB_BLANK_UNBLANK;
123
124         if (sinfo->backlight)
125                 return;
126
127         bl = backlight_device_register("backlight", &sinfo->pdev->dev,
128                         sinfo, &atmel_lcdc_bl_ops);
129         if (IS_ERR(bl)) {
130                 dev_err(&sinfo->pdev->dev, "error %ld on backlight register\n",
131                                 PTR_ERR(bl));
132                 return;
133         }
134         sinfo->backlight = bl;
135
136         bl->props.power = FB_BLANK_UNBLANK;
137         bl->props.fb_blank = FB_BLANK_UNBLANK;
138         bl->props.max_brightness = 0xff;
139         bl->props.brightness = atmel_bl_get_brightness(bl);
140 }
141
142 static void exit_backlight(struct atmel_lcdfb_info *sinfo)
143 {
144         if (sinfo->backlight)
145                 backlight_device_unregister(sinfo->backlight);
146 }
147
148 #else
149
150 static void init_backlight(struct atmel_lcdfb_info *sinfo)
151 {
152         dev_warn(&sinfo->pdev->dev, "backlight control is not available\n");
153 }
154
155 static void exit_backlight(struct atmel_lcdfb_info *sinfo)
156 {
157 }
158
159 #endif
160
161 static void init_contrast(struct atmel_lcdfb_info *sinfo)
162 {
163         /* have some default contrast/backlight settings */
164         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr);
165         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT);
166
167         if (sinfo->lcdcon_is_backlight)
168                 init_backlight(sinfo);
169 }
170
171
172 static struct fb_fix_screeninfo atmel_lcdfb_fix __initdata = {
173         .type           = FB_TYPE_PACKED_PIXELS,
174         .visual         = FB_VISUAL_TRUECOLOR,
175         .xpanstep       = 0,
176         .ypanstep       = 1,
177         .ywrapstep      = 0,
178         .accel          = FB_ACCEL_NONE,
179 };
180
181 static unsigned long compute_hozval(unsigned long xres, unsigned long lcdcon2)
182 {
183         unsigned long value;
184
185         if (!(cpu_is_at91sam9261() || cpu_is_at91sam9g10()
186                 || cpu_is_at32ap7000()))
187                 return xres;
188
189         value = xres;
190         if ((lcdcon2 & ATMEL_LCDC_DISTYPE) != ATMEL_LCDC_DISTYPE_TFT) {
191                 /* STN display */
192                 if ((lcdcon2 & ATMEL_LCDC_DISTYPE) == ATMEL_LCDC_DISTYPE_STNCOLOR) {
193                         value *= 3;
194                 }
195                 if ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_4
196                    || ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_8
197                       && (lcdcon2 & ATMEL_LCDC_SCANMOD) == ATMEL_LCDC_SCANMOD_DUAL ))
198                         value = DIV_ROUND_UP(value, 4);
199                 else
200                         value = DIV_ROUND_UP(value, 8);
201         }
202
203         return value;
204 }
205
206 static void atmel_lcdfb_stop_nowait(struct atmel_lcdfb_info *sinfo)
207 {
208         /* Turn off the LCD controller and the DMA controller */
209         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
210                         sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET);
211
212         /* Wait for the LCDC core to become idle */
213         while (lcdc_readl(sinfo, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY)
214                 msleep(10);
215
216         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, 0);
217 }
218
219 static void atmel_lcdfb_stop(struct atmel_lcdfb_info *sinfo)
220 {
221         atmel_lcdfb_stop_nowait(sinfo);
222
223         /* Wait for DMA engine to become idle... */
224         while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
225                 msleep(10);
226 }
227
228 static void atmel_lcdfb_start(struct atmel_lcdfb_info *sinfo)
229 {
230         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, sinfo->default_dmacon);
231         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
232                 (sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET)
233                 | ATMEL_LCDC_PWR);
234 }
235
236 static void atmel_lcdfb_update_dma(struct fb_info *info,
237                                struct fb_var_screeninfo *var)
238 {
239         struct atmel_lcdfb_info *sinfo = info->par;
240         struct fb_fix_screeninfo *fix = &info->fix;
241         unsigned long dma_addr;
242
243         dma_addr = (fix->smem_start + var->yoffset * fix->line_length
244                     + var->xoffset * var->bits_per_pixel / 8);
245
246         dma_addr &= ~3UL;
247
248         /* Set framebuffer DMA base address and pixel offset */
249         lcdc_writel(sinfo, ATMEL_LCDC_DMABADDR1, dma_addr);
250
251         atmel_lcdfb_update_dma2d(sinfo, var);
252 }
253
254 static inline void atmel_lcdfb_free_video_memory(struct atmel_lcdfb_info *sinfo)
255 {
256         struct fb_info *info = sinfo->info;
257
258         dma_free_writecombine(info->device, info->fix.smem_len,
259                                 info->screen_base, info->fix.smem_start);
260 }
261
262 /**
263  *      atmel_lcdfb_alloc_video_memory - Allocate framebuffer memory
264  *      @sinfo: the frame buffer to allocate memory for
265  *      
266  *      This function is called only from the atmel_lcdfb_probe()
267  *      so no locking by fb_info->mm_lock around smem_len setting is needed.
268  */
269 static int atmel_lcdfb_alloc_video_memory(struct atmel_lcdfb_info *sinfo)
270 {
271         struct fb_info *info = sinfo->info;
272         struct fb_var_screeninfo *var = &info->var;
273         unsigned int smem_len;
274
275         smem_len = (var->xres_virtual * var->yres_virtual
276                     * ((var->bits_per_pixel + 7) / 8));
277         info->fix.smem_len = max(smem_len, sinfo->smem_len);
278
279         info->screen_base = dma_alloc_writecombine(info->device, info->fix.smem_len,
280                                         (dma_addr_t *)&info->fix.smem_start, GFP_KERNEL);
281
282         if (!info->screen_base) {
283                 return -ENOMEM;
284         }
285
286         memset(info->screen_base, 0, info->fix.smem_len);
287
288         return 0;
289 }
290
291 static const struct fb_videomode *atmel_lcdfb_choose_mode(struct fb_var_screeninfo *var,
292                                                      struct fb_info *info)
293 {
294         struct fb_videomode varfbmode;
295         const struct fb_videomode *fbmode = NULL;
296
297         fb_var_to_videomode(&varfbmode, var);
298         fbmode = fb_find_nearest_mode(&varfbmode, &info->modelist);
299         if (fbmode)
300                 fb_videomode_to_var(var, fbmode);
301         return fbmode;
302 }
303
304
305 /**
306  *      atmel_lcdfb_check_var - Validates a var passed in.
307  *      @var: frame buffer variable screen structure
308  *      @info: frame buffer structure that represents a single frame buffer
309  *
310  *      Checks to see if the hardware supports the state requested by
311  *      var passed in. This function does not alter the hardware
312  *      state!!!  This means the data stored in struct fb_info and
313  *      struct atmel_lcdfb_info do not change. This includes the var
314  *      inside of struct fb_info.  Do NOT change these. This function
315  *      can be called on its own if we intent to only test a mode and
316  *      not actually set it. The stuff in modedb.c is a example of
317  *      this. If the var passed in is slightly off by what the
318  *      hardware can support then we alter the var PASSED in to what
319  *      we can do. If the hardware doesn't support mode change a
320  *      -EINVAL will be returned by the upper layers. You don't need
321  *      to implement this function then. If you hardware doesn't
322  *      support changing the resolution then this function is not
323  *      needed. In this case the driver would just provide a var that
324  *      represents the static state the screen is in.
325  *
326  *      Returns negative errno on error, or zero on success.
327  */
328 static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var,
329                              struct fb_info *info)
330 {
331         struct device *dev = info->device;
332         struct atmel_lcdfb_info *sinfo = info->par;
333         unsigned long clk_value_khz;
334
335         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
336
337         dev_dbg(dev, "%s:\n", __func__);
338
339         if (!(var->pixclock && var->bits_per_pixel)) {
340                 /* choose a suitable mode if possible */
341                 if (!atmel_lcdfb_choose_mode(var, info)) {
342                         dev_err(dev, "needed value not specified\n");
343                         return -EINVAL;
344                 }
345         }
346
347         dev_dbg(dev, "  resolution: %ux%u\n", var->xres, var->yres);
348         dev_dbg(dev, "  pixclk:     %lu KHz\n", PICOS2KHZ(var->pixclock));
349         dev_dbg(dev, "  bpp:        %u\n", var->bits_per_pixel);
350         dev_dbg(dev, "  clk:        %lu KHz\n", clk_value_khz);
351
352         if (PICOS2KHZ(var->pixclock) > clk_value_khz) {
353                 dev_err(dev, "%lu KHz pixel clock is too fast\n", PICOS2KHZ(var->pixclock));
354                 return -EINVAL;
355         }
356
357         /* Do not allow to have real resoulution larger than virtual */
358         if (var->xres > var->xres_virtual)
359                 var->xres_virtual = var->xres;
360
361         if (var->yres > var->yres_virtual)
362                 var->yres_virtual = var->yres;
363
364         /* Force same alignment for each line */
365         var->xres = (var->xres + 3) & ~3UL;
366         var->xres_virtual = (var->xres_virtual + 3) & ~3UL;
367
368         var->red.msb_right = var->green.msb_right = var->blue.msb_right = 0;
369         var->transp.msb_right = 0;
370         var->transp.offset = var->transp.length = 0;
371         var->xoffset = var->yoffset = 0;
372
373         if (info->fix.smem_len) {
374                 unsigned int smem_len = (var->xres_virtual * var->yres_virtual
375                                          * ((var->bits_per_pixel + 7) / 8));
376                 if (smem_len > info->fix.smem_len)
377                         return -EINVAL;
378         }
379
380         /* Saturate vertical and horizontal timings at maximum values */
381         var->vsync_len = min_t(u32, var->vsync_len,
382                         (ATMEL_LCDC_VPW >> ATMEL_LCDC_VPW_OFFSET) + 1);
383         var->upper_margin = min_t(u32, var->upper_margin,
384                         ATMEL_LCDC_VBP >> ATMEL_LCDC_VBP_OFFSET);
385         var->lower_margin = min_t(u32, var->lower_margin,
386                         ATMEL_LCDC_VFP);
387         var->right_margin = min_t(u32, var->right_margin,
388                         (ATMEL_LCDC_HFP >> ATMEL_LCDC_HFP_OFFSET) + 1);
389         var->hsync_len = min_t(u32, var->hsync_len,
390                         (ATMEL_LCDC_HPW >> ATMEL_LCDC_HPW_OFFSET) + 1);
391         var->left_margin = min_t(u32, var->left_margin,
392                         ATMEL_LCDC_HBP + 1);
393
394         /* Some parameters can't be zero */
395         var->vsync_len = max_t(u32, var->vsync_len, 1);
396         var->right_margin = max_t(u32, var->right_margin, 1);
397         var->hsync_len = max_t(u32, var->hsync_len, 1);
398         var->left_margin = max_t(u32, var->left_margin, 1);
399
400         switch (var->bits_per_pixel) {
401         case 1:
402         case 2:
403         case 4:
404         case 8:
405                 var->red.offset = var->green.offset = var->blue.offset = 0;
406                 var->red.length = var->green.length = var->blue.length
407                         = var->bits_per_pixel;
408                 break;
409         case 15:
410         case 16:
411                 if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
412                         /* RGB:565 mode */
413                         var->red.offset = 11;
414                         var->blue.offset = 0;
415                         var->green.length = 6;
416                 } else if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB555) {
417                         var->red.offset = 10;
418                         var->blue.offset = 0;
419                         var->green.length = 5;
420                 } else {
421                         /* BGR:555 mode */
422                         var->red.offset = 0;
423                         var->blue.offset = 10;
424                         var->green.length = 5;
425                 }
426                 var->green.offset = 5;
427                 var->red.length = var->blue.length = 5;
428                 break;
429         case 32:
430                 var->transp.offset = 24;
431                 var->transp.length = 8;
432                 /* fall through */
433         case 24:
434                 if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
435                         /* RGB:888 mode */
436                         var->red.offset = 16;
437                         var->blue.offset = 0;
438                 } else {
439                         /* BGR:888 mode */
440                         var->red.offset = 0;
441                         var->blue.offset = 16;
442                 }
443                 var->green.offset = 8;
444                 var->red.length = var->green.length = var->blue.length = 8;
445                 break;
446         default:
447                 dev_err(dev, "color depth %d not supported\n",
448                                         var->bits_per_pixel);
449                 return -EINVAL;
450         }
451
452         return 0;
453 }
454
455 /*
456  * LCD reset sequence
457  */
458 static void atmel_lcdfb_reset(struct atmel_lcdfb_info *sinfo)
459 {
460         might_sleep();
461
462         atmel_lcdfb_stop(sinfo);
463         atmel_lcdfb_start(sinfo);
464 }
465
466 /**
467  *      atmel_lcdfb_set_par - Alters the hardware state.
468  *      @info: frame buffer structure that represents a single frame buffer
469  *
470  *      Using the fb_var_screeninfo in fb_info we set the resolution
471  *      of the this particular framebuffer. This function alters the
472  *      par AND the fb_fix_screeninfo stored in fb_info. It doesn't
473  *      not alter var in fb_info since we are using that data. This
474  *      means we depend on the data in var inside fb_info to be
475  *      supported by the hardware.  atmel_lcdfb_check_var is always called
476  *      before atmel_lcdfb_set_par to ensure this.  Again if you can't
477  *      change the resolution you don't need this function.
478  *
479  */
480 static int atmel_lcdfb_set_par(struct fb_info *info)
481 {
482         struct atmel_lcdfb_info *sinfo = info->par;
483         unsigned long hozval_linesz;
484         unsigned long value;
485         unsigned long clk_value_khz;
486         unsigned long bits_per_line;
487
488         might_sleep();
489
490         dev_dbg(info->device, "%s:\n", __func__);
491         dev_dbg(info->device, "  * resolution: %ux%u (%ux%u virtual)\n",
492                  info->var.xres, info->var.yres,
493                  info->var.xres_virtual, info->var.yres_virtual);
494
495         atmel_lcdfb_stop_nowait(sinfo);
496
497         if (info->var.bits_per_pixel == 1)
498                 info->fix.visual = FB_VISUAL_MONO01;
499         else if (info->var.bits_per_pixel <= 8)
500                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
501         else
502                 info->fix.visual = FB_VISUAL_TRUECOLOR;
503
504         bits_per_line = info->var.xres_virtual * info->var.bits_per_pixel;
505         info->fix.line_length = DIV_ROUND_UP(bits_per_line, 8);
506
507         /* Re-initialize the DMA engine... */
508         dev_dbg(info->device, "  * update DMA engine\n");
509         atmel_lcdfb_update_dma(info, &info->var);
510
511         /* ...set frame size and burst length = 8 words (?) */
512         value = (info->var.yres * info->var.xres * info->var.bits_per_pixel) / 32;
513         value |= ((ATMEL_LCDC_DMA_BURST_LEN - 1) << ATMEL_LCDC_BLENGTH_OFFSET);
514         lcdc_writel(sinfo, ATMEL_LCDC_DMAFRMCFG, value);
515
516         /* Now, the LCDC core... */
517
518         /* Set pixel clock */
519         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
520
521         value = DIV_ROUND_UP(clk_value_khz, PICOS2KHZ(info->var.pixclock));
522
523         if (value < 2) {
524                 dev_notice(info->device, "Bypassing pixel clock divider\n");
525                 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS);
526         } else {
527                 value = (value / 2) - 1;
528                 dev_dbg(info->device, "  * programming CLKVAL = 0x%08lx\n",
529                                 value);
530                 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1,
531                                 value << ATMEL_LCDC_CLKVAL_OFFSET);
532                 info->var.pixclock = KHZ2PICOS(clk_value_khz / (2 * (value + 1)));
533                 dev_dbg(info->device, "  updated pixclk:     %lu KHz\n",
534                                         PICOS2KHZ(info->var.pixclock));
535         }
536
537
538         /* Initialize control register 2 */
539         value = sinfo->default_lcdcon2;
540
541         if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
542                 value |= ATMEL_LCDC_INVLINE_INVERTED;
543         if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
544                 value |= ATMEL_LCDC_INVFRAME_INVERTED;
545
546         switch (info->var.bits_per_pixel) {
547                 case 1: value |= ATMEL_LCDC_PIXELSIZE_1; break;
548                 case 2: value |= ATMEL_LCDC_PIXELSIZE_2; break;
549                 case 4: value |= ATMEL_LCDC_PIXELSIZE_4; break;
550                 case 8: value |= ATMEL_LCDC_PIXELSIZE_8; break;
551                 case 15: /* fall through */
552                 case 16: value |= ATMEL_LCDC_PIXELSIZE_16; break;
553                 case 24: value |= ATMEL_LCDC_PIXELSIZE_24; break;
554                 case 32: value |= ATMEL_LCDC_PIXELSIZE_32; break;
555                 default: BUG(); break;
556         }
557         dev_dbg(info->device, "  * LCDCON2 = %08lx\n", value);
558         lcdc_writel(sinfo, ATMEL_LCDC_LCDCON2, value);
559
560         /* Vertical timing */
561         value = (info->var.vsync_len - 1) << ATMEL_LCDC_VPW_OFFSET;
562         value |= info->var.upper_margin << ATMEL_LCDC_VBP_OFFSET;
563         value |= info->var.lower_margin;
564         dev_dbg(info->device, "  * LCDTIM1 = %08lx\n", value);
565         lcdc_writel(sinfo, ATMEL_LCDC_TIM1, value);
566
567         /* Horizontal timing */
568         value = (info->var.right_margin - 1) << ATMEL_LCDC_HFP_OFFSET;
569         value |= (info->var.hsync_len - 1) << ATMEL_LCDC_HPW_OFFSET;
570         value |= (info->var.left_margin - 1);
571         dev_dbg(info->device, "  * LCDTIM2 = %08lx\n", value);
572         lcdc_writel(sinfo, ATMEL_LCDC_TIM2, value);
573
574         /* Horizontal value (aka line size) */
575         hozval_linesz = compute_hozval(info->var.xres,
576                                         lcdc_readl(sinfo, ATMEL_LCDC_LCDCON2));
577
578         /* Display size */
579         value = (hozval_linesz - 1) << ATMEL_LCDC_HOZVAL_OFFSET;
580         value |= info->var.yres - 1;
581         dev_dbg(info->device, "  * LCDFRMCFG = %08lx\n", value);
582         lcdc_writel(sinfo, ATMEL_LCDC_LCDFRMCFG, value);
583
584         /* FIFO Threshold: Use formula from data sheet */
585         value = ATMEL_LCDC_FIFO_SIZE - (2 * ATMEL_LCDC_DMA_BURST_LEN + 3);
586         lcdc_writel(sinfo, ATMEL_LCDC_FIFO, value);
587
588         /* Toggle LCD_MODE every frame */
589         lcdc_writel(sinfo, ATMEL_LCDC_MVAL, 0);
590
591         /* Disable all interrupts */
592         lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
593         /* Enable FIFO & DMA errors */
594         lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
595
596         /* ...wait for DMA engine to become idle... */
597         while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
598                 msleep(10);
599
600         atmel_lcdfb_start(sinfo);
601
602         dev_dbg(info->device, "  * DONE\n");
603
604         return 0;
605 }
606
607 static inline unsigned int chan_to_field(unsigned int chan, const struct fb_bitfield *bf)
608 {
609         chan &= 0xffff;
610         chan >>= 16 - bf->length;
611         return chan << bf->offset;
612 }
613
614 /**
615  *      atmel_lcdfb_setcolreg - Optional function. Sets a color register.
616  *      @regno: Which register in the CLUT we are programming
617  *      @red: The red value which can be up to 16 bits wide
618  *      @green: The green value which can be up to 16 bits wide
619  *      @blue:  The blue value which can be up to 16 bits wide.
620  *      @transp: If supported the alpha value which can be up to 16 bits wide.
621  *      @info: frame buffer info structure
622  *
623  *      Set a single color register. The values supplied have a 16 bit
624  *      magnitude which needs to be scaled in this function for the hardware.
625  *      Things to take into consideration are how many color registers, if
626  *      any, are supported with the current color visual. With truecolor mode
627  *      no color palettes are supported. Here a psuedo palette is created
628  *      which we store the value in pseudo_palette in struct fb_info. For
629  *      pseudocolor mode we have a limited color palette. To deal with this
630  *      we can program what color is displayed for a particular pixel value.
631  *      DirectColor is similar in that we can program each color field. If
632  *      we have a static colormap we don't need to implement this function.
633  *
634  *      Returns negative errno on error, or zero on success. In an
635  *      ideal world, this would have been the case, but as it turns
636  *      out, the other drivers return 1 on failure, so that's what
637  *      we're going to do.
638  */
639 static int atmel_lcdfb_setcolreg(unsigned int regno, unsigned int red,
640                              unsigned int green, unsigned int blue,
641                              unsigned int transp, struct fb_info *info)
642 {
643         struct atmel_lcdfb_info *sinfo = info->par;
644         unsigned int val;
645         u32 *pal;
646         int ret = 1;
647
648         if (info->var.grayscale)
649                 red = green = blue = (19595 * red + 38470 * green
650                                       + 7471 * blue) >> 16;
651
652         switch (info->fix.visual) {
653         case FB_VISUAL_TRUECOLOR:
654                 if (regno < 16) {
655                         pal = info->pseudo_palette;
656
657                         val  = chan_to_field(red, &info->var.red);
658                         val |= chan_to_field(green, &info->var.green);
659                         val |= chan_to_field(blue, &info->var.blue);
660
661                         pal[regno] = val;
662                         ret = 0;
663                 }
664                 break;
665
666         case FB_VISUAL_PSEUDOCOLOR:
667                 if (regno < 256) {
668                         val  = ((red   >> 11) & 0x001f);
669                         val |= ((green >>  6) & 0x03e0);
670                         val |= ((blue  >>  1) & 0x7c00);
671
672                         /*
673                          * TODO: intensity bit. Maybe something like
674                          *   ~(red[10] ^ green[10] ^ blue[10]) & 1
675                          */
676
677                         lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
678                         ret = 0;
679                 }
680                 break;
681
682         case FB_VISUAL_MONO01:
683                 if (regno < 2) {
684                         val = (regno == 0) ? 0x00 : 0x1F;
685                         lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
686                         ret = 0;
687                 }
688                 break;
689
690         }
691
692         return ret;
693 }
694
695 static int atmel_lcdfb_pan_display(struct fb_var_screeninfo *var,
696                                struct fb_info *info)
697 {
698         dev_dbg(info->device, "%s\n", __func__);
699
700         atmel_lcdfb_update_dma(info, var);
701
702         return 0;
703 }
704
705 static struct fb_ops atmel_lcdfb_ops = {
706         .owner          = THIS_MODULE,
707         .fb_check_var   = atmel_lcdfb_check_var,
708         .fb_set_par     = atmel_lcdfb_set_par,
709         .fb_setcolreg   = atmel_lcdfb_setcolreg,
710         .fb_pan_display = atmel_lcdfb_pan_display,
711         .fb_fillrect    = cfb_fillrect,
712         .fb_copyarea    = cfb_copyarea,
713         .fb_imageblit   = cfb_imageblit,
714 };
715
716 static irqreturn_t atmel_lcdfb_interrupt(int irq, void *dev_id)
717 {
718         struct fb_info *info = dev_id;
719         struct atmel_lcdfb_info *sinfo = info->par;
720         u32 status;
721
722         status = lcdc_readl(sinfo, ATMEL_LCDC_ISR);
723         if (status & ATMEL_LCDC_UFLWI) {
724                 dev_warn(info->device, "FIFO underflow %#x\n", status);
725                 /* reset DMA and FIFO to avoid screen shifting */
726                 schedule_work(&sinfo->task);
727         }
728         lcdc_writel(sinfo, ATMEL_LCDC_ICR, status);
729         return IRQ_HANDLED;
730 }
731
732 /*
733  * LCD controller task (to reset the LCD)
734  */
735 static void atmel_lcdfb_task(struct work_struct *work)
736 {
737         struct atmel_lcdfb_info *sinfo =
738                 container_of(work, struct atmel_lcdfb_info, task);
739
740         atmel_lcdfb_reset(sinfo);
741 }
742
743 static int __init atmel_lcdfb_init_fbinfo(struct atmel_lcdfb_info *sinfo)
744 {
745         struct fb_info *info = sinfo->info;
746         int ret = 0;
747
748         info->var.activate |= FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW;
749
750         dev_info(info->device,
751                "%luKiB frame buffer at %08lx (mapped at %p)\n",
752                (unsigned long)info->fix.smem_len / 1024,
753                (unsigned long)info->fix.smem_start,
754                info->screen_base);
755
756         /* Allocate colormap */
757         ret = fb_alloc_cmap(&info->cmap, 256, 0);
758         if (ret < 0)
759                 dev_err(info->device, "Alloc color map failed\n");
760
761         return ret;
762 }
763
764 static void atmel_lcdfb_start_clock(struct atmel_lcdfb_info *sinfo)
765 {
766         if (sinfo->bus_clk)
767                 clk_enable(sinfo->bus_clk);
768         clk_enable(sinfo->lcdc_clk);
769 }
770
771 static void atmel_lcdfb_stop_clock(struct atmel_lcdfb_info *sinfo)
772 {
773         if (sinfo->bus_clk)
774                 clk_disable(sinfo->bus_clk);
775         clk_disable(sinfo->lcdc_clk);
776 }
777
778
779 static int __init atmel_lcdfb_probe(struct platform_device *pdev)
780 {
781         struct device *dev = &pdev->dev;
782         struct fb_info *info;
783         struct atmel_lcdfb_info *sinfo;
784         struct atmel_lcdfb_info *pdata_sinfo;
785         struct fb_videomode fbmode;
786         struct resource *regs = NULL;
787         struct resource *map = NULL;
788         int ret;
789
790         dev_dbg(dev, "%s BEGIN\n", __func__);
791
792         ret = -ENOMEM;
793         info = framebuffer_alloc(sizeof(struct atmel_lcdfb_info), dev);
794         if (!info) {
795                 dev_err(dev, "cannot allocate memory\n");
796                 goto out;
797         }
798
799         sinfo = info->par;
800
801         if (dev->platform_data) {
802                 pdata_sinfo = (struct atmel_lcdfb_info *)dev->platform_data;
803                 sinfo->default_bpp = pdata_sinfo->default_bpp;
804                 sinfo->default_dmacon = pdata_sinfo->default_dmacon;
805                 sinfo->default_lcdcon2 = pdata_sinfo->default_lcdcon2;
806                 sinfo->default_monspecs = pdata_sinfo->default_monspecs;
807                 sinfo->atmel_lcdfb_power_control = pdata_sinfo->atmel_lcdfb_power_control;
808                 sinfo->guard_time = pdata_sinfo->guard_time;
809                 sinfo->smem_len = pdata_sinfo->smem_len;
810                 sinfo->lcdcon_is_backlight = pdata_sinfo->lcdcon_is_backlight;
811                 sinfo->lcd_wiring_mode = pdata_sinfo->lcd_wiring_mode;
812         } else {
813                 dev_err(dev, "cannot get default configuration\n");
814                 goto free_info;
815         }
816         sinfo->info = info;
817         sinfo->pdev = pdev;
818
819         strcpy(info->fix.id, sinfo->pdev->name);
820         info->flags = ATMEL_LCDFB_FBINFO_DEFAULT;
821         info->pseudo_palette = sinfo->pseudo_palette;
822         info->fbops = &atmel_lcdfb_ops;
823
824         memcpy(&info->monspecs, sinfo->default_monspecs, sizeof(info->monspecs));
825         info->fix = atmel_lcdfb_fix;
826
827         /* Enable LCDC Clocks */
828         if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()
829          || cpu_is_at32ap7000()) {
830                 sinfo->bus_clk = clk_get(dev, "hck1");
831                 if (IS_ERR(sinfo->bus_clk)) {
832                         ret = PTR_ERR(sinfo->bus_clk);
833                         goto free_info;
834                 }
835         }
836         sinfo->lcdc_clk = clk_get(dev, "lcdc_clk");
837         if (IS_ERR(sinfo->lcdc_clk)) {
838                 ret = PTR_ERR(sinfo->lcdc_clk);
839                 goto put_bus_clk;
840         }
841         atmel_lcdfb_start_clock(sinfo);
842
843         ret = fb_find_mode(&info->var, info, NULL, info->monspecs.modedb,
844                         info->monspecs.modedb_len, info->monspecs.modedb,
845                         sinfo->default_bpp);
846         if (!ret) {
847                 dev_err(dev, "no suitable video mode found\n");
848                 goto stop_clk;
849         }
850
851
852         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
853         if (!regs) {
854                 dev_err(dev, "resources unusable\n");
855                 ret = -ENXIO;
856                 goto stop_clk;
857         }
858
859         sinfo->irq_base = platform_get_irq(pdev, 0);
860         if (sinfo->irq_base < 0) {
861                 dev_err(dev, "unable to get irq\n");
862                 ret = sinfo->irq_base;
863                 goto stop_clk;
864         }
865
866         /* Initialize video memory */
867         map = platform_get_resource(pdev, IORESOURCE_MEM, 1);
868         if (map) {
869                 /* use a pre-allocated memory buffer */
870                 info->fix.smem_start = map->start;
871                 info->fix.smem_len = map->end - map->start + 1;
872                 if (!request_mem_region(info->fix.smem_start,
873                                         info->fix.smem_len, pdev->name)) {
874                         ret = -EBUSY;
875                         goto stop_clk;
876                 }
877
878                 info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
879                 if (!info->screen_base)
880                         goto release_intmem;
881
882                 /*
883                  * Don't clear the framebuffer -- someone may have set
884                  * up a splash image.
885                  */
886         } else {
887                 /* alocate memory buffer */
888                 ret = atmel_lcdfb_alloc_video_memory(sinfo);
889                 if (ret < 0) {
890                         dev_err(dev, "cannot allocate framebuffer: %d\n", ret);
891                         goto stop_clk;
892                 }
893         }
894
895         /* LCDC registers */
896         info->fix.mmio_start = regs->start;
897         info->fix.mmio_len = regs->end - regs->start + 1;
898
899         if (!request_mem_region(info->fix.mmio_start,
900                                 info->fix.mmio_len, pdev->name)) {
901                 ret = -EBUSY;
902                 goto free_fb;
903         }
904
905         sinfo->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len);
906         if (!sinfo->mmio) {
907                 dev_err(dev, "cannot map LCDC registers\n");
908                 goto release_mem;
909         }
910
911         /* Initialize PWM for contrast or backlight ("off") */
912         init_contrast(sinfo);
913
914         /* interrupt */
915         ret = request_irq(sinfo->irq_base, atmel_lcdfb_interrupt, 0, pdev->name, info);
916         if (ret) {
917                 dev_err(dev, "request_irq failed: %d\n", ret);
918                 goto unmap_mmio;
919         }
920
921         /* Some operations on the LCDC might sleep and
922          * require a preemptible task context */
923         INIT_WORK(&sinfo->task, atmel_lcdfb_task);
924
925         ret = atmel_lcdfb_init_fbinfo(sinfo);
926         if (ret < 0) {
927                 dev_err(dev, "init fbinfo failed: %d\n", ret);
928                 goto unregister_irqs;
929         }
930
931         /*
932          * This makes sure that our colour bitfield
933          * descriptors are correctly initialised.
934          */
935         atmel_lcdfb_check_var(&info->var, info);
936
937         ret = fb_set_var(info, &info->var);
938         if (ret) {
939                 dev_warn(dev, "unable to set display parameters\n");
940                 goto free_cmap;
941         }
942
943         dev_set_drvdata(dev, info);
944
945         /*
946          * Tell the world that we're ready to go
947          */
948         ret = register_framebuffer(info);
949         if (ret < 0) {
950                 dev_err(dev, "failed to register framebuffer device: %d\n", ret);
951                 goto reset_drvdata;
952         }
953
954         /* add selected videomode to modelist */
955         fb_var_to_videomode(&fbmode, &info->var);
956         fb_add_videomode(&fbmode, &info->modelist);
957
958         /* Power up the LCDC screen */
959         if (sinfo->atmel_lcdfb_power_control)
960                 sinfo->atmel_lcdfb_power_control(1);
961
962         dev_info(dev, "fb%d: Atmel LCDC at 0x%08lx (mapped at %p), irq %lu\n",
963                        info->node, info->fix.mmio_start, sinfo->mmio, sinfo->irq_base);
964
965         return 0;
966
967 reset_drvdata:
968         dev_set_drvdata(dev, NULL);
969 free_cmap:
970         fb_dealloc_cmap(&info->cmap);
971 unregister_irqs:
972         cancel_work_sync(&sinfo->task);
973         free_irq(sinfo->irq_base, info);
974 unmap_mmio:
975         exit_backlight(sinfo);
976         iounmap(sinfo->mmio);
977 release_mem:
978         release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
979 free_fb:
980         if (map)
981                 iounmap(info->screen_base);
982         else
983                 atmel_lcdfb_free_video_memory(sinfo);
984
985 release_intmem:
986         if (map)
987                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
988 stop_clk:
989         atmel_lcdfb_stop_clock(sinfo);
990         clk_put(sinfo->lcdc_clk);
991 put_bus_clk:
992         if (sinfo->bus_clk)
993                 clk_put(sinfo->bus_clk);
994 free_info:
995         framebuffer_release(info);
996 out:
997         dev_dbg(dev, "%s FAILED\n", __func__);
998         return ret;
999 }
1000
1001 static int __exit atmel_lcdfb_remove(struct platform_device *pdev)
1002 {
1003         struct device *dev = &pdev->dev;
1004         struct fb_info *info = dev_get_drvdata(dev);
1005         struct atmel_lcdfb_info *sinfo;
1006
1007         if (!info || !info->par)
1008                 return 0;
1009         sinfo = info->par;
1010
1011         cancel_work_sync(&sinfo->task);
1012         exit_backlight(sinfo);
1013         if (sinfo->atmel_lcdfb_power_control)
1014                 sinfo->atmel_lcdfb_power_control(0);
1015         unregister_framebuffer(info);
1016         atmel_lcdfb_stop_clock(sinfo);
1017         clk_put(sinfo->lcdc_clk);
1018         if (sinfo->bus_clk)
1019                 clk_put(sinfo->bus_clk);
1020         fb_dealloc_cmap(&info->cmap);
1021         free_irq(sinfo->irq_base, info);
1022         iounmap(sinfo->mmio);
1023         release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1024         if (platform_get_resource(pdev, IORESOURCE_MEM, 1)) {
1025                 iounmap(info->screen_base);
1026                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1027         } else {
1028                 atmel_lcdfb_free_video_memory(sinfo);
1029         }
1030
1031         dev_set_drvdata(dev, NULL);
1032         framebuffer_release(info);
1033
1034         return 0;
1035 }
1036
1037 #ifdef CONFIG_PM
1038
1039 static int atmel_lcdfb_suspend(struct platform_device *pdev, pm_message_t mesg)
1040 {
1041         struct fb_info *info = platform_get_drvdata(pdev);
1042         struct atmel_lcdfb_info *sinfo = info->par;
1043
1044         /*
1045          * We don't want to handle interrupts while the clock is
1046          * stopped. It may take forever.
1047          */
1048         lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
1049
1050         sinfo->saved_lcdcon = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
1051         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, 0);
1052         if (sinfo->atmel_lcdfb_power_control)
1053                 sinfo->atmel_lcdfb_power_control(0);
1054
1055         atmel_lcdfb_stop(sinfo);
1056         atmel_lcdfb_stop_clock(sinfo);
1057
1058         return 0;
1059 }
1060
1061 static int atmel_lcdfb_resume(struct platform_device *pdev)
1062 {
1063         struct fb_info *info = platform_get_drvdata(pdev);
1064         struct atmel_lcdfb_info *sinfo = info->par;
1065
1066         atmel_lcdfb_start_clock(sinfo);
1067         atmel_lcdfb_start(sinfo);
1068         if (sinfo->atmel_lcdfb_power_control)
1069                 sinfo->atmel_lcdfb_power_control(1);
1070         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, sinfo->saved_lcdcon);
1071
1072         /* Enable FIFO & DMA errors */
1073         lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI
1074                         | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
1075
1076         return 0;
1077 }
1078
1079 #else
1080 #define atmel_lcdfb_suspend     NULL
1081 #define atmel_lcdfb_resume      NULL
1082 #endif
1083
1084 static struct platform_driver atmel_lcdfb_driver = {
1085         .remove         = __exit_p(atmel_lcdfb_remove),
1086         .suspend        = atmel_lcdfb_suspend,
1087         .resume         = atmel_lcdfb_resume,
1088
1089         .driver         = {
1090                 .name   = "atmel_lcdfb",
1091                 .owner  = THIS_MODULE,
1092         },
1093 };
1094
1095 static int __init atmel_lcdfb_init(void)
1096 {
1097         return platform_driver_probe(&atmel_lcdfb_driver, atmel_lcdfb_probe);
1098 }
1099
1100 static void __exit atmel_lcdfb_exit(void)
1101 {
1102         platform_driver_unregister(&atmel_lcdfb_driver);
1103 }
1104
1105 module_init(atmel_lcdfb_init);
1106 module_exit(atmel_lcdfb_exit);
1107
1108 MODULE_DESCRIPTION("AT91/AT32 LCD Controller framebuffer driver");
1109 MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
1110 MODULE_LICENSE("GPL");