Merge branch 'for-rmk' of git://source.mvista.com/git/linux-davinci-2.6.git
[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
33
34 #if defined(CONFIG_ARCH_AT91SAM9263) || defined(CONFIG_ARCH_AT91CAP9) || \
35         defined(CONFIG_ARCH_AT91SAM9RL)
36 #define ATMEL_LCDC_FIFO_SIZE            2048
37 #else
38 #define ATMEL_LCDC_FIFO_SIZE            512
39 #endif
40
41 #if defined(CONFIG_ARCH_AT91)
42 #define ATMEL_LCDFB_FBINFO_DEFAULT      (FBINFO_DEFAULT \
43                                          | FBINFO_PARTIAL_PAN_OK \
44                                          | FBINFO_HWACCEL_YPAN)
45
46 static inline void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
47                                         struct fb_var_screeninfo *var)
48 {
49
50 }
51 #elif defined(CONFIG_AVR32)
52 #define ATMEL_LCDFB_FBINFO_DEFAULT      (FBINFO_DEFAULT \
53                                         | FBINFO_PARTIAL_PAN_OK \
54                                         | FBINFO_HWACCEL_XPAN \
55                                         | FBINFO_HWACCEL_YPAN)
56
57 static void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
58                                      struct fb_var_screeninfo *var)
59 {
60         u32 dma2dcfg;
61         u32 pixeloff;
62
63         pixeloff = (var->xoffset * var->bits_per_pixel) & 0x1f;
64
65         dma2dcfg = ((var->xres_virtual - var->xres) * var->bits_per_pixel) / 8;
66         dma2dcfg |= pixeloff << ATMEL_LCDC_PIXELOFF_OFFSET;
67         lcdc_writel(sinfo, ATMEL_LCDC_DMA2DCFG, dma2dcfg);
68
69         /* Update configuration */
70         lcdc_writel(sinfo, ATMEL_LCDC_DMACON,
71                     lcdc_readl(sinfo, ATMEL_LCDC_DMACON)
72                     | ATMEL_LCDC_DMAUPDT);
73 }
74 #endif
75
76 static const u32 contrast_ctr = ATMEL_LCDC_PS_DIV8
77                 | ATMEL_LCDC_POL_POSITIVE
78                 | ATMEL_LCDC_ENA_PWMENABLE;
79
80 #ifdef CONFIG_BACKLIGHT_ATMEL_LCDC
81
82 /* some bl->props field just changed */
83 static int atmel_bl_update_status(struct backlight_device *bl)
84 {
85         struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
86         int                     power = sinfo->bl_power;
87         int                     brightness = bl->props.brightness;
88
89         /* REVISIT there may be a meaningful difference between
90          * fb_blank and power ... there seem to be some cases
91          * this doesn't handle correctly.
92          */
93         if (bl->props.fb_blank != sinfo->bl_power)
94                 power = bl->props.fb_blank;
95         else if (bl->props.power != sinfo->bl_power)
96                 power = bl->props.power;
97
98         if (brightness < 0 && power == FB_BLANK_UNBLANK)
99                 brightness = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
100         else if (power != FB_BLANK_UNBLANK)
101                 brightness = 0;
102
103         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, brightness);
104         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR,
105                         brightness ? contrast_ctr : 0);
106
107         bl->props.fb_blank = bl->props.power = sinfo->bl_power = power;
108
109         return 0;
110 }
111
112 static int atmel_bl_get_brightness(struct backlight_device *bl)
113 {
114         struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
115
116         return lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
117 }
118
119 static struct backlight_ops atmel_lcdc_bl_ops = {
120         .update_status = atmel_bl_update_status,
121         .get_brightness = atmel_bl_get_brightness,
122 };
123
124 static void init_backlight(struct atmel_lcdfb_info *sinfo)
125 {
126         struct backlight_device *bl;
127
128         sinfo->bl_power = FB_BLANK_UNBLANK;
129
130         if (sinfo->backlight)
131                 return;
132
133         bl = backlight_device_register("backlight", &sinfo->pdev->dev,
134                         sinfo, &atmel_lcdc_bl_ops);
135         if (IS_ERR(sinfo->backlight)) {
136                 dev_err(&sinfo->pdev->dev, "error %ld on backlight register\n",
137                                 PTR_ERR(bl));
138                 return;
139         }
140         sinfo->backlight = bl;
141
142         bl->props.power = FB_BLANK_UNBLANK;
143         bl->props.fb_blank = FB_BLANK_UNBLANK;
144         bl->props.max_brightness = 0xff;
145         bl->props.brightness = atmel_bl_get_brightness(bl);
146 }
147
148 static void exit_backlight(struct atmel_lcdfb_info *sinfo)
149 {
150         if (sinfo->backlight)
151                 backlight_device_unregister(sinfo->backlight);
152 }
153
154 #else
155
156 static void init_backlight(struct atmel_lcdfb_info *sinfo)
157 {
158         dev_warn(&sinfo->pdev->dev, "backlight control is not available\n");
159 }
160
161 static void exit_backlight(struct atmel_lcdfb_info *sinfo)
162 {
163 }
164
165 #endif
166
167 static void init_contrast(struct atmel_lcdfb_info *sinfo)
168 {
169         /* have some default contrast/backlight settings */
170         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr);
171         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT);
172
173         if (sinfo->lcdcon_is_backlight)
174                 init_backlight(sinfo);
175 }
176
177
178 static struct fb_fix_screeninfo atmel_lcdfb_fix __initdata = {
179         .type           = FB_TYPE_PACKED_PIXELS,
180         .visual         = FB_VISUAL_TRUECOLOR,
181         .xpanstep       = 0,
182         .ypanstep       = 1,
183         .ywrapstep      = 0,
184         .accel          = FB_ACCEL_NONE,
185 };
186
187 static unsigned long compute_hozval(unsigned long xres, unsigned long lcdcon2)
188 {
189         unsigned long value;
190
191         if (!(cpu_is_at91sam9261() || cpu_is_at32ap7000()))
192                 return xres;
193
194         value = xres;
195         if ((lcdcon2 & ATMEL_LCDC_DISTYPE) != ATMEL_LCDC_DISTYPE_TFT) {
196                 /* STN display */
197                 if ((lcdcon2 & ATMEL_LCDC_DISTYPE) == ATMEL_LCDC_DISTYPE_STNCOLOR) {
198                         value *= 3;
199                 }
200                 if ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_4
201                    || ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_8
202                       && (lcdcon2 & ATMEL_LCDC_SCANMOD) == ATMEL_LCDC_SCANMOD_DUAL ))
203                         value = DIV_ROUND_UP(value, 4);
204                 else
205                         value = DIV_ROUND_UP(value, 8);
206         }
207
208         return value;
209 }
210
211 static void atmel_lcdfb_stop_nowait(struct atmel_lcdfb_info *sinfo)
212 {
213         /* Turn off the LCD controller and the DMA controller */
214         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
215                         sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET);
216
217         /* Wait for the LCDC core to become idle */
218         while (lcdc_readl(sinfo, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY)
219                 msleep(10);
220
221         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, 0);
222 }
223
224 static void atmel_lcdfb_stop(struct atmel_lcdfb_info *sinfo)
225 {
226         atmel_lcdfb_stop_nowait(sinfo);
227
228         /* Wait for DMA engine to become idle... */
229         while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
230                 msleep(10);
231 }
232
233 static void atmel_lcdfb_start(struct atmel_lcdfb_info *sinfo)
234 {
235         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, sinfo->default_dmacon);
236         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
237                 (sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET)
238                 | ATMEL_LCDC_PWR);
239 }
240
241 static void atmel_lcdfb_update_dma(struct fb_info *info,
242                                struct fb_var_screeninfo *var)
243 {
244         struct atmel_lcdfb_info *sinfo = info->par;
245         struct fb_fix_screeninfo *fix = &info->fix;
246         unsigned long dma_addr;
247
248         dma_addr = (fix->smem_start + var->yoffset * fix->line_length
249                     + var->xoffset * var->bits_per_pixel / 8);
250
251         dma_addr &= ~3UL;
252
253         /* Set framebuffer DMA base address and pixel offset */
254         lcdc_writel(sinfo, ATMEL_LCDC_DMABADDR1, dma_addr);
255
256         atmel_lcdfb_update_dma2d(sinfo, var);
257 }
258
259 static inline void atmel_lcdfb_free_video_memory(struct atmel_lcdfb_info *sinfo)
260 {
261         struct fb_info *info = sinfo->info;
262
263         dma_free_writecombine(info->device, info->fix.smem_len,
264                                 info->screen_base, info->fix.smem_start);
265 }
266
267 /**
268  *      atmel_lcdfb_alloc_video_memory - Allocate framebuffer memory
269  *      @sinfo: the frame buffer to allocate memory for
270  */
271 static int atmel_lcdfb_alloc_video_memory(struct atmel_lcdfb_info *sinfo)
272 {
273         struct fb_info *info = sinfo->info;
274         struct fb_var_screeninfo *var = &info->var;
275         unsigned int smem_len;
276
277         smem_len = (var->xres_virtual * var->yres_virtual
278                     * ((var->bits_per_pixel + 7) / 8));
279         info->fix.smem_len = max(smem_len, sinfo->smem_len);
280
281         info->screen_base = dma_alloc_writecombine(info->device, info->fix.smem_len,
282                                         (dma_addr_t *)&info->fix.smem_start, GFP_KERNEL);
283
284         if (!info->screen_base) {
285                 return -ENOMEM;
286         }
287
288         memset(info->screen_base, 0, info->fix.smem_len);
289
290         return 0;
291 }
292
293 static const struct fb_videomode *atmel_lcdfb_choose_mode(struct fb_var_screeninfo *var,
294                                                      struct fb_info *info)
295 {
296         struct fb_videomode varfbmode;
297         const struct fb_videomode *fbmode = NULL;
298
299         fb_var_to_videomode(&varfbmode, var);
300         fbmode = fb_find_nearest_mode(&varfbmode, &info->modelist);
301         if (fbmode)
302                 fb_videomode_to_var(var, fbmode);
303         return fbmode;
304 }
305
306
307 /**
308  *      atmel_lcdfb_check_var - Validates a var passed in.
309  *      @var: frame buffer variable screen structure
310  *      @info: frame buffer structure that represents a single frame buffer
311  *
312  *      Checks to see if the hardware supports the state requested by
313  *      var passed in. This function does not alter the hardware
314  *      state!!!  This means the data stored in struct fb_info and
315  *      struct atmel_lcdfb_info do not change. This includes the var
316  *      inside of struct fb_info.  Do NOT change these. This function
317  *      can be called on its own if we intent to only test a mode and
318  *      not actually set it. The stuff in modedb.c is a example of
319  *      this. If the var passed in is slightly off by what the
320  *      hardware can support then we alter the var PASSED in to what
321  *      we can do. If the hardware doesn't support mode change a
322  *      -EINVAL will be returned by the upper layers. You don't need
323  *      to implement this function then. If you hardware doesn't
324  *      support changing the resolution then this function is not
325  *      needed. In this case the driver would just provide a var that
326  *      represents the static state the screen is in.
327  *
328  *      Returns negative errno on error, or zero on success.
329  */
330 static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var,
331                              struct fb_info *info)
332 {
333         struct device *dev = info->device;
334         struct atmel_lcdfb_info *sinfo = info->par;
335         unsigned long clk_value_khz;
336
337         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
338
339         dev_dbg(dev, "%s:\n", __func__);
340
341         if (!(var->pixclock && var->bits_per_pixel)) {
342                 /* choose a suitable mode if possible */
343                 if (!atmel_lcdfb_choose_mode(var, info)) {
344                         dev_err(dev, "needed value not specified\n");
345                         return -EINVAL;
346                 }
347         }
348
349         dev_dbg(dev, "  resolution: %ux%u\n", var->xres, var->yres);
350         dev_dbg(dev, "  pixclk:     %lu KHz\n", PICOS2KHZ(var->pixclock));
351         dev_dbg(dev, "  bpp:        %u\n", var->bits_per_pixel);
352         dev_dbg(dev, "  clk:        %lu KHz\n", clk_value_khz);
353
354         if ((PICOS2KHZ(var->pixclock) * var->bits_per_pixel / 8) > clk_value_khz) {
355                 dev_err(dev, "%lu KHz pixel clock is too fast\n", PICOS2KHZ(var->pixclock));
356                 return -EINVAL;
357         }
358
359         /* Do not allow to have real resoulution larger than virtual */
360         if (var->xres > var->xres_virtual)
361                 var->xres_virtual = var->xres;
362
363         if (var->yres > var->yres_virtual)
364                 var->yres_virtual = var->yres;
365
366         /* Force same alignment for each line */
367         var->xres = (var->xres + 3) & ~3UL;
368         var->xres_virtual = (var->xres_virtual + 3) & ~3UL;
369
370         var->red.msb_right = var->green.msb_right = var->blue.msb_right = 0;
371         var->transp.msb_right = 0;
372         var->transp.offset = var->transp.length = 0;
373         var->xoffset = var->yoffset = 0;
374
375         /* Saturate vertical and horizontal timings at maximum values */
376         var->vsync_len = min_t(u32, var->vsync_len,
377                         (ATMEL_LCDC_VPW >> ATMEL_LCDC_VPW_OFFSET) + 1);
378         var->upper_margin = min_t(u32, var->upper_margin,
379                         ATMEL_LCDC_VBP >> ATMEL_LCDC_VBP_OFFSET);
380         var->lower_margin = min_t(u32, var->lower_margin,
381                         ATMEL_LCDC_VFP);
382         var->right_margin = min_t(u32, var->right_margin,
383                         (ATMEL_LCDC_HFP >> ATMEL_LCDC_HFP_OFFSET) + 1);
384         var->hsync_len = min_t(u32, var->hsync_len,
385                         (ATMEL_LCDC_HPW >> ATMEL_LCDC_HPW_OFFSET) + 1);
386         var->left_margin = min_t(u32, var->left_margin,
387                         ATMEL_LCDC_HBP + 1);
388
389         /* Some parameters can't be zero */
390         var->vsync_len = max_t(u32, var->vsync_len, 1);
391         var->right_margin = max_t(u32, var->right_margin, 1);
392         var->hsync_len = max_t(u32, var->hsync_len, 1);
393         var->left_margin = max_t(u32, var->left_margin, 1);
394
395         switch (var->bits_per_pixel) {
396         case 1:
397         case 2:
398         case 4:
399         case 8:
400                 var->red.offset = var->green.offset = var->blue.offset = 0;
401                 var->red.length = var->green.length = var->blue.length
402                         = var->bits_per_pixel;
403                 break;
404         case 15:
405         case 16:
406                 if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
407                         /* RGB:565 mode */
408                         var->red.offset = 11;
409                         var->blue.offset = 0;
410                         var->green.length = 6;
411                 } else if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB555) {
412                         var->red.offset = 10;
413                         var->blue.offset = 0;
414                         var->green.length = 5;
415                 } else {
416                         /* BGR:555 mode */
417                         var->red.offset = 0;
418                         var->blue.offset = 10;
419                         var->green.length = 5;
420                 }
421                 var->green.offset = 5;
422                 var->red.length = var->blue.length = 5;
423                 break;
424         case 32:
425                 var->transp.offset = 24;
426                 var->transp.length = 8;
427                 /* fall through */
428         case 24:
429                 if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
430                         /* RGB:888 mode */
431                         var->red.offset = 16;
432                         var->blue.offset = 0;
433                 } else {
434                         /* BGR:888 mode */
435                         var->red.offset = 0;
436                         var->blue.offset = 16;
437                 }
438                 var->green.offset = 8;
439                 var->red.length = var->green.length = var->blue.length = 8;
440                 break;
441         default:
442                 dev_err(dev, "color depth %d not supported\n",
443                                         var->bits_per_pixel);
444                 return -EINVAL;
445         }
446
447         return 0;
448 }
449
450 /*
451  * LCD reset sequence
452  */
453 static void atmel_lcdfb_reset(struct atmel_lcdfb_info *sinfo)
454 {
455         might_sleep();
456
457         atmel_lcdfb_stop(sinfo);
458         atmel_lcdfb_start(sinfo);
459 }
460
461 /**
462  *      atmel_lcdfb_set_par - Alters the hardware state.
463  *      @info: frame buffer structure that represents a single frame buffer
464  *
465  *      Using the fb_var_screeninfo in fb_info we set the resolution
466  *      of the this particular framebuffer. This function alters the
467  *      par AND the fb_fix_screeninfo stored in fb_info. It doesn't
468  *      not alter var in fb_info since we are using that data. This
469  *      means we depend on the data in var inside fb_info to be
470  *      supported by the hardware.  atmel_lcdfb_check_var is always called
471  *      before atmel_lcdfb_set_par to ensure this.  Again if you can't
472  *      change the resolution you don't need this function.
473  *
474  */
475 static int atmel_lcdfb_set_par(struct fb_info *info)
476 {
477         struct atmel_lcdfb_info *sinfo = info->par;
478         unsigned long hozval_linesz;
479         unsigned long value;
480         unsigned long clk_value_khz;
481         unsigned long bits_per_line;
482
483         might_sleep();
484
485         dev_dbg(info->device, "%s:\n", __func__);
486         dev_dbg(info->device, "  * resolution: %ux%u (%ux%u virtual)\n",
487                  info->var.xres, info->var.yres,
488                  info->var.xres_virtual, info->var.yres_virtual);
489
490         atmel_lcdfb_stop_nowait(sinfo);
491
492         if (info->var.bits_per_pixel == 1)
493                 info->fix.visual = FB_VISUAL_MONO01;
494         else if (info->var.bits_per_pixel <= 8)
495                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
496         else
497                 info->fix.visual = FB_VISUAL_TRUECOLOR;
498
499         bits_per_line = info->var.xres_virtual * info->var.bits_per_pixel;
500         info->fix.line_length = DIV_ROUND_UP(bits_per_line, 8);
501
502         /* Re-initialize the DMA engine... */
503         dev_dbg(info->device, "  * update DMA engine\n");
504         atmel_lcdfb_update_dma(info, &info->var);
505
506         /* ...set frame size and burst length = 8 words (?) */
507         value = (info->var.yres * info->var.xres * info->var.bits_per_pixel) / 32;
508         value |= ((ATMEL_LCDC_DMA_BURST_LEN - 1) << ATMEL_LCDC_BLENGTH_OFFSET);
509         lcdc_writel(sinfo, ATMEL_LCDC_DMAFRMCFG, value);
510
511         /* Now, the LCDC core... */
512
513         /* Set pixel clock */
514         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
515
516         value = DIV_ROUND_UP(clk_value_khz, PICOS2KHZ(info->var.pixclock));
517
518         if (value < 2) {
519                 dev_notice(info->device, "Bypassing pixel clock divider\n");
520                 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS);
521         } else {
522                 value = (value / 2) - 1;
523                 dev_dbg(info->device, "  * programming CLKVAL = 0x%08lx\n",
524                                 value);
525                 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1,
526                                 value << ATMEL_LCDC_CLKVAL_OFFSET);
527                 info->var.pixclock = KHZ2PICOS(clk_value_khz / (2 * (value + 1)));
528                 dev_dbg(info->device, "  updated pixclk:     %lu KHz\n",
529                                         PICOS2KHZ(info->var.pixclock));
530         }
531
532
533         /* Initialize control register 2 */
534         value = sinfo->default_lcdcon2;
535
536         if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
537                 value |= ATMEL_LCDC_INVLINE_INVERTED;
538         if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
539                 value |= ATMEL_LCDC_INVFRAME_INVERTED;
540
541         switch (info->var.bits_per_pixel) {
542                 case 1: value |= ATMEL_LCDC_PIXELSIZE_1; break;
543                 case 2: value |= ATMEL_LCDC_PIXELSIZE_2; break;
544                 case 4: value |= ATMEL_LCDC_PIXELSIZE_4; break;
545                 case 8: value |= ATMEL_LCDC_PIXELSIZE_8; break;
546                 case 15: /* fall through */
547                 case 16: value |= ATMEL_LCDC_PIXELSIZE_16; break;
548                 case 24: value |= ATMEL_LCDC_PIXELSIZE_24; break;
549                 case 32: value |= ATMEL_LCDC_PIXELSIZE_32; break;
550                 default: BUG(); break;
551         }
552         dev_dbg(info->device, "  * LCDCON2 = %08lx\n", value);
553         lcdc_writel(sinfo, ATMEL_LCDC_LCDCON2, value);
554
555         /* Vertical timing */
556         value = (info->var.vsync_len - 1) << ATMEL_LCDC_VPW_OFFSET;
557         value |= info->var.upper_margin << ATMEL_LCDC_VBP_OFFSET;
558         value |= info->var.lower_margin;
559         dev_dbg(info->device, "  * LCDTIM1 = %08lx\n", value);
560         lcdc_writel(sinfo, ATMEL_LCDC_TIM1, value);
561
562         /* Horizontal timing */
563         value = (info->var.right_margin - 1) << ATMEL_LCDC_HFP_OFFSET;
564         value |= (info->var.hsync_len - 1) << ATMEL_LCDC_HPW_OFFSET;
565         value |= (info->var.left_margin - 1);
566         dev_dbg(info->device, "  * LCDTIM2 = %08lx\n", value);
567         lcdc_writel(sinfo, ATMEL_LCDC_TIM2, value);
568
569         /* Horizontal value (aka line size) */
570         hozval_linesz = compute_hozval(info->var.xres,
571                                         lcdc_readl(sinfo, ATMEL_LCDC_LCDCON2));
572
573         /* Display size */
574         value = (hozval_linesz - 1) << ATMEL_LCDC_HOZVAL_OFFSET;
575         value |= info->var.yres - 1;
576         dev_dbg(info->device, "  * LCDFRMCFG = %08lx\n", value);
577         lcdc_writel(sinfo, ATMEL_LCDC_LCDFRMCFG, value);
578
579         /* FIFO Threshold: Use formula from data sheet */
580         value = ATMEL_LCDC_FIFO_SIZE - (2 * ATMEL_LCDC_DMA_BURST_LEN + 3);
581         lcdc_writel(sinfo, ATMEL_LCDC_FIFO, value);
582
583         /* Toggle LCD_MODE every frame */
584         lcdc_writel(sinfo, ATMEL_LCDC_MVAL, 0);
585
586         /* Disable all interrupts */
587         lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
588         /* Enable FIFO & DMA errors */
589         lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
590
591         /* ...wait for DMA engine to become idle... */
592         while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
593                 msleep(10);
594
595         atmel_lcdfb_start(sinfo);
596
597         dev_dbg(info->device, "  * DONE\n");
598
599         return 0;
600 }
601
602 static inline unsigned int chan_to_field(unsigned int chan, const struct fb_bitfield *bf)
603 {
604         chan &= 0xffff;
605         chan >>= 16 - bf->length;
606         return chan << bf->offset;
607 }
608
609 /**
610  *      atmel_lcdfb_setcolreg - Optional function. Sets a color register.
611  *      @regno: Which register in the CLUT we are programming
612  *      @red: The red value which can be up to 16 bits wide
613  *      @green: The green value which can be up to 16 bits wide
614  *      @blue:  The blue value which can be up to 16 bits wide.
615  *      @transp: If supported the alpha value which can be up to 16 bits wide.
616  *      @info: frame buffer info structure
617  *
618  *      Set a single color register. The values supplied have a 16 bit
619  *      magnitude which needs to be scaled in this function for the hardware.
620  *      Things to take into consideration are how many color registers, if
621  *      any, are supported with the current color visual. With truecolor mode
622  *      no color palettes are supported. Here a psuedo palette is created
623  *      which we store the value in pseudo_palette in struct fb_info. For
624  *      pseudocolor mode we have a limited color palette. To deal with this
625  *      we can program what color is displayed for a particular pixel value.
626  *      DirectColor is similar in that we can program each color field. If
627  *      we have a static colormap we don't need to implement this function.
628  *
629  *      Returns negative errno on error, or zero on success. In an
630  *      ideal world, this would have been the case, but as it turns
631  *      out, the other drivers return 1 on failure, so that's what
632  *      we're going to do.
633  */
634 static int atmel_lcdfb_setcolreg(unsigned int regno, unsigned int red,
635                              unsigned int green, unsigned int blue,
636                              unsigned int transp, struct fb_info *info)
637 {
638         struct atmel_lcdfb_info *sinfo = info->par;
639         unsigned int val;
640         u32 *pal;
641         int ret = 1;
642
643         if (info->var.grayscale)
644                 red = green = blue = (19595 * red + 38470 * green
645                                       + 7471 * blue) >> 16;
646
647         switch (info->fix.visual) {
648         case FB_VISUAL_TRUECOLOR:
649                 if (regno < 16) {
650                         pal = info->pseudo_palette;
651
652                         val  = chan_to_field(red, &info->var.red);
653                         val |= chan_to_field(green, &info->var.green);
654                         val |= chan_to_field(blue, &info->var.blue);
655
656                         pal[regno] = val;
657                         ret = 0;
658                 }
659                 break;
660
661         case FB_VISUAL_PSEUDOCOLOR:
662                 if (regno < 256) {
663                         val  = ((red   >> 11) & 0x001f);
664                         val |= ((green >>  6) & 0x03e0);
665                         val |= ((blue  >>  1) & 0x7c00);
666
667                         /*
668                          * TODO: intensity bit. Maybe something like
669                          *   ~(red[10] ^ green[10] ^ blue[10]) & 1
670                          */
671
672                         lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
673                         ret = 0;
674                 }
675                 break;
676
677         case FB_VISUAL_MONO01:
678                 if (regno < 2) {
679                         val = (regno == 0) ? 0x00 : 0x1F;
680                         lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
681                         ret = 0;
682                 }
683                 break;
684
685         }
686
687         return ret;
688 }
689
690 static int atmel_lcdfb_pan_display(struct fb_var_screeninfo *var,
691                                struct fb_info *info)
692 {
693         dev_dbg(info->device, "%s\n", __func__);
694
695         atmel_lcdfb_update_dma(info, var);
696
697         return 0;
698 }
699
700 static struct fb_ops atmel_lcdfb_ops = {
701         .owner          = THIS_MODULE,
702         .fb_check_var   = atmel_lcdfb_check_var,
703         .fb_set_par     = atmel_lcdfb_set_par,
704         .fb_setcolreg   = atmel_lcdfb_setcolreg,
705         .fb_pan_display = atmel_lcdfb_pan_display,
706         .fb_fillrect    = cfb_fillrect,
707         .fb_copyarea    = cfb_copyarea,
708         .fb_imageblit   = cfb_imageblit,
709 };
710
711 static irqreturn_t atmel_lcdfb_interrupt(int irq, void *dev_id)
712 {
713         struct fb_info *info = dev_id;
714         struct atmel_lcdfb_info *sinfo = info->par;
715         u32 status;
716
717         status = lcdc_readl(sinfo, ATMEL_LCDC_ISR);
718         if (status & ATMEL_LCDC_UFLWI) {
719                 dev_warn(info->device, "FIFO underflow %#x\n", status);
720                 /* reset DMA and FIFO to avoid screen shifting */
721                 schedule_work(&sinfo->task);
722         }
723         lcdc_writel(sinfo, ATMEL_LCDC_ICR, status);
724         return IRQ_HANDLED;
725 }
726
727 /*
728  * LCD controller task (to reset the LCD)
729  */
730 static void atmel_lcdfb_task(struct work_struct *work)
731 {
732         struct atmel_lcdfb_info *sinfo =
733                 container_of(work, struct atmel_lcdfb_info, task);
734
735         atmel_lcdfb_reset(sinfo);
736 }
737
738 static int __init atmel_lcdfb_init_fbinfo(struct atmel_lcdfb_info *sinfo)
739 {
740         struct fb_info *info = sinfo->info;
741         int ret = 0;
742
743         info->var.activate |= FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW;
744
745         dev_info(info->device,
746                "%luKiB frame buffer at %08lx (mapped at %p)\n",
747                (unsigned long)info->fix.smem_len / 1024,
748                (unsigned long)info->fix.smem_start,
749                info->screen_base);
750
751         /* Allocate colormap */
752         ret = fb_alloc_cmap(&info->cmap, 256, 0);
753         if (ret < 0)
754                 dev_err(info->device, "Alloc color map failed\n");
755
756         return ret;
757 }
758
759 static void atmel_lcdfb_start_clock(struct atmel_lcdfb_info *sinfo)
760 {
761         if (sinfo->bus_clk)
762                 clk_enable(sinfo->bus_clk);
763         clk_enable(sinfo->lcdc_clk);
764 }
765
766 static void atmel_lcdfb_stop_clock(struct atmel_lcdfb_info *sinfo)
767 {
768         if (sinfo->bus_clk)
769                 clk_disable(sinfo->bus_clk);
770         clk_disable(sinfo->lcdc_clk);
771 }
772
773
774 static int __init atmel_lcdfb_probe(struct platform_device *pdev)
775 {
776         struct device *dev = &pdev->dev;
777         struct fb_info *info;
778         struct atmel_lcdfb_info *sinfo;
779         struct atmel_lcdfb_info *pdata_sinfo;
780         struct fb_videomode fbmode;
781         struct resource *regs = NULL;
782         struct resource *map = NULL;
783         int ret;
784
785         dev_dbg(dev, "%s BEGIN\n", __func__);
786
787         ret = -ENOMEM;
788         info = framebuffer_alloc(sizeof(struct atmel_lcdfb_info), dev);
789         if (!info) {
790                 dev_err(dev, "cannot allocate memory\n");
791                 goto out;
792         }
793
794         sinfo = info->par;
795
796         if (dev->platform_data) {
797                 pdata_sinfo = (struct atmel_lcdfb_info *)dev->platform_data;
798                 sinfo->default_bpp = pdata_sinfo->default_bpp;
799                 sinfo->default_dmacon = pdata_sinfo->default_dmacon;
800                 sinfo->default_lcdcon2 = pdata_sinfo->default_lcdcon2;
801                 sinfo->default_monspecs = pdata_sinfo->default_monspecs;
802                 sinfo->atmel_lcdfb_power_control = pdata_sinfo->atmel_lcdfb_power_control;
803                 sinfo->guard_time = pdata_sinfo->guard_time;
804                 sinfo->smem_len = pdata_sinfo->smem_len;
805                 sinfo->lcdcon_is_backlight = pdata_sinfo->lcdcon_is_backlight;
806                 sinfo->lcd_wiring_mode = pdata_sinfo->lcd_wiring_mode;
807         } else {
808                 dev_err(dev, "cannot get default configuration\n");
809                 goto free_info;
810         }
811         sinfo->info = info;
812         sinfo->pdev = pdev;
813
814         strcpy(info->fix.id, sinfo->pdev->name);
815         info->flags = ATMEL_LCDFB_FBINFO_DEFAULT;
816         info->pseudo_palette = sinfo->pseudo_palette;
817         info->fbops = &atmel_lcdfb_ops;
818
819         memcpy(&info->monspecs, sinfo->default_monspecs, sizeof(info->monspecs));
820         info->fix = atmel_lcdfb_fix;
821
822         /* Enable LCDC Clocks */
823         if (cpu_is_at91sam9261() || cpu_is_at32ap7000()) {
824                 sinfo->bus_clk = clk_get(dev, "hck1");
825                 if (IS_ERR(sinfo->bus_clk)) {
826                         ret = PTR_ERR(sinfo->bus_clk);
827                         goto free_info;
828                 }
829         }
830         sinfo->lcdc_clk = clk_get(dev, "lcdc_clk");
831         if (IS_ERR(sinfo->lcdc_clk)) {
832                 ret = PTR_ERR(sinfo->lcdc_clk);
833                 goto put_bus_clk;
834         }
835         atmel_lcdfb_start_clock(sinfo);
836
837         ret = fb_find_mode(&info->var, info, NULL, info->monspecs.modedb,
838                         info->monspecs.modedb_len, info->monspecs.modedb,
839                         sinfo->default_bpp);
840         if (!ret) {
841                 dev_err(dev, "no suitable video mode found\n");
842                 goto stop_clk;
843         }
844
845
846         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
847         if (!regs) {
848                 dev_err(dev, "resources unusable\n");
849                 ret = -ENXIO;
850                 goto stop_clk;
851         }
852
853         sinfo->irq_base = platform_get_irq(pdev, 0);
854         if (sinfo->irq_base < 0) {
855                 dev_err(dev, "unable to get irq\n");
856                 ret = sinfo->irq_base;
857                 goto stop_clk;
858         }
859
860         /* Initialize video memory */
861         map = platform_get_resource(pdev, IORESOURCE_MEM, 1);
862         if (map) {
863                 /* use a pre-allocated memory buffer */
864                 info->fix.smem_start = map->start;
865                 info->fix.smem_len = map->end - map->start + 1;
866                 if (!request_mem_region(info->fix.smem_start,
867                                         info->fix.smem_len, pdev->name)) {
868                         ret = -EBUSY;
869                         goto stop_clk;
870                 }
871
872                 info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
873                 if (!info->screen_base)
874                         goto release_intmem;
875
876                 /*
877                  * Don't clear the framebuffer -- someone may have set
878                  * up a splash image.
879                  */
880         } else {
881                 /* alocate memory buffer */
882                 ret = atmel_lcdfb_alloc_video_memory(sinfo);
883                 if (ret < 0) {
884                         dev_err(dev, "cannot allocate framebuffer: %d\n", ret);
885                         goto stop_clk;
886                 }
887         }
888
889         /* LCDC registers */
890         info->fix.mmio_start = regs->start;
891         info->fix.mmio_len = regs->end - regs->start + 1;
892
893         if (!request_mem_region(info->fix.mmio_start,
894                                 info->fix.mmio_len, pdev->name)) {
895                 ret = -EBUSY;
896                 goto free_fb;
897         }
898
899         sinfo->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len);
900         if (!sinfo->mmio) {
901                 dev_err(dev, "cannot map LCDC registers\n");
902                 goto release_mem;
903         }
904
905         /* Initialize PWM for contrast or backlight ("off") */
906         init_contrast(sinfo);
907
908         /* interrupt */
909         ret = request_irq(sinfo->irq_base, atmel_lcdfb_interrupt, 0, pdev->name, info);
910         if (ret) {
911                 dev_err(dev, "request_irq failed: %d\n", ret);
912                 goto unmap_mmio;
913         }
914
915         /* Some operations on the LCDC might sleep and
916          * require a preemptible task context */
917         INIT_WORK(&sinfo->task, atmel_lcdfb_task);
918
919         ret = atmel_lcdfb_init_fbinfo(sinfo);
920         if (ret < 0) {
921                 dev_err(dev, "init fbinfo failed: %d\n", ret);
922                 goto unregister_irqs;
923         }
924
925         /*
926          * This makes sure that our colour bitfield
927          * descriptors are correctly initialised.
928          */
929         atmel_lcdfb_check_var(&info->var, info);
930
931         ret = fb_set_var(info, &info->var);
932         if (ret) {
933                 dev_warn(dev, "unable to set display parameters\n");
934                 goto free_cmap;
935         }
936
937         dev_set_drvdata(dev, info);
938
939         /*
940          * Tell the world that we're ready to go
941          */
942         ret = register_framebuffer(info);
943         if (ret < 0) {
944                 dev_err(dev, "failed to register framebuffer device: %d\n", ret);
945                 goto reset_drvdata;
946         }
947
948         /* add selected videomode to modelist */
949         fb_var_to_videomode(&fbmode, &info->var);
950         fb_add_videomode(&fbmode, &info->modelist);
951
952         /* Power up the LCDC screen */
953         if (sinfo->atmel_lcdfb_power_control)
954                 sinfo->atmel_lcdfb_power_control(1);
955
956         dev_info(dev, "fb%d: Atmel LCDC at 0x%08lx (mapped at %p), irq %lu\n",
957                        info->node, info->fix.mmio_start, sinfo->mmio, sinfo->irq_base);
958
959         return 0;
960
961 reset_drvdata:
962         dev_set_drvdata(dev, NULL);
963 free_cmap:
964         fb_dealloc_cmap(&info->cmap);
965 unregister_irqs:
966         cancel_work_sync(&sinfo->task);
967         free_irq(sinfo->irq_base, info);
968 unmap_mmio:
969         exit_backlight(sinfo);
970         iounmap(sinfo->mmio);
971 release_mem:
972         release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
973 free_fb:
974         if (map)
975                 iounmap(info->screen_base);
976         else
977                 atmel_lcdfb_free_video_memory(sinfo);
978
979 release_intmem:
980         if (map)
981                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
982 stop_clk:
983         atmel_lcdfb_stop_clock(sinfo);
984         clk_put(sinfo->lcdc_clk);
985 put_bus_clk:
986         if (sinfo->bus_clk)
987                 clk_put(sinfo->bus_clk);
988 free_info:
989         framebuffer_release(info);
990 out:
991         dev_dbg(dev, "%s FAILED\n", __func__);
992         return ret;
993 }
994
995 static int __exit atmel_lcdfb_remove(struct platform_device *pdev)
996 {
997         struct device *dev = &pdev->dev;
998         struct fb_info *info = dev_get_drvdata(dev);
999         struct atmel_lcdfb_info *sinfo;
1000
1001         if (!info || !info->par)
1002                 return 0;
1003         sinfo = info->par;
1004
1005         cancel_work_sync(&sinfo->task);
1006         exit_backlight(sinfo);
1007         if (sinfo->atmel_lcdfb_power_control)
1008                 sinfo->atmel_lcdfb_power_control(0);
1009         unregister_framebuffer(info);
1010         atmel_lcdfb_stop_clock(sinfo);
1011         clk_put(sinfo->lcdc_clk);
1012         if (sinfo->bus_clk)
1013                 clk_put(sinfo->bus_clk);
1014         fb_dealloc_cmap(&info->cmap);
1015         free_irq(sinfo->irq_base, info);
1016         iounmap(sinfo->mmio);
1017         release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1018         if (platform_get_resource(pdev, IORESOURCE_MEM, 1)) {
1019                 iounmap(info->screen_base);
1020                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1021         } else {
1022                 atmel_lcdfb_free_video_memory(sinfo);
1023         }
1024
1025         dev_set_drvdata(dev, NULL);
1026         framebuffer_release(info);
1027
1028         return 0;
1029 }
1030
1031 #ifdef CONFIG_PM
1032
1033 static int atmel_lcdfb_suspend(struct platform_device *pdev, pm_message_t mesg)
1034 {
1035         struct fb_info *info = platform_get_drvdata(pdev);
1036         struct atmel_lcdfb_info *sinfo = info->par;
1037
1038         /*
1039          * We don't want to handle interrupts while the clock is
1040          * stopped. It may take forever.
1041          */
1042         lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
1043
1044         sinfo->saved_lcdcon = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
1045         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, 0);
1046         if (sinfo->atmel_lcdfb_power_control)
1047                 sinfo->atmel_lcdfb_power_control(0);
1048
1049         atmel_lcdfb_stop(sinfo);
1050         atmel_lcdfb_stop_clock(sinfo);
1051
1052         return 0;
1053 }
1054
1055 static int atmel_lcdfb_resume(struct platform_device *pdev)
1056 {
1057         struct fb_info *info = platform_get_drvdata(pdev);
1058         struct atmel_lcdfb_info *sinfo = info->par;
1059
1060         atmel_lcdfb_start_clock(sinfo);
1061         atmel_lcdfb_start(sinfo);
1062         if (sinfo->atmel_lcdfb_power_control)
1063                 sinfo->atmel_lcdfb_power_control(1);
1064         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, sinfo->saved_lcdcon);
1065
1066         /* Enable FIFO & DMA errors */
1067         lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI
1068                         | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
1069
1070         return 0;
1071 }
1072
1073 #else
1074 #define atmel_lcdfb_suspend     NULL
1075 #define atmel_lcdfb_resume      NULL
1076 #endif
1077
1078 static struct platform_driver atmel_lcdfb_driver = {
1079         .remove         = __exit_p(atmel_lcdfb_remove),
1080         .suspend        = atmel_lcdfb_suspend,
1081         .resume         = atmel_lcdfb_resume,
1082
1083         .driver         = {
1084                 .name   = "atmel_lcdfb",
1085                 .owner  = THIS_MODULE,
1086         },
1087 };
1088
1089 static int __init atmel_lcdfb_init(void)
1090 {
1091         return platform_driver_probe(&atmel_lcdfb_driver, atmel_lcdfb_probe);
1092 }
1093
1094 static void __exit atmel_lcdfb_exit(void)
1095 {
1096         platform_driver_unregister(&atmel_lcdfb_driver);
1097 }
1098
1099 module_init(atmel_lcdfb_init);
1100 module_exit(atmel_lcdfb_exit);
1101
1102 MODULE_DESCRIPTION("AT91/AT32 LCD Controller framebuffer driver");
1103 MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
1104 MODULE_LICENSE("GPL");