treewide: Convert uses of struct resource to resource_size(ptr)
[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 #include <linux/gfp.h>
21
22 #include <mach/board.h>
23 #include <mach/cpu.h>
24 #include <mach/gpio.h>
25
26 #include <video/atmel_lcdc.h>
27
28 #define lcdc_readl(sinfo, reg)          __raw_readl((sinfo)->mmio+(reg))
29 #define lcdc_writel(sinfo, reg, val)    __raw_writel((val), (sinfo)->mmio+(reg))
30
31 /* configurable parameters */
32 #define ATMEL_LCDC_CVAL_DEFAULT         0xc8
33 #define ATMEL_LCDC_DMA_BURST_LEN        8       /* words */
34 #define ATMEL_LCDC_FIFO_SIZE            512     /* words */
35
36 #if defined(CONFIG_ARCH_AT91)
37 #define ATMEL_LCDFB_FBINFO_DEFAULT      (FBINFO_DEFAULT \
38                                          | FBINFO_PARTIAL_PAN_OK \
39                                          | FBINFO_HWACCEL_YPAN)
40
41 static inline void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
42                                         struct fb_var_screeninfo *var)
43 {
44
45 }
46 #elif defined(CONFIG_AVR32)
47 #define ATMEL_LCDFB_FBINFO_DEFAULT      (FBINFO_DEFAULT \
48                                         | FBINFO_PARTIAL_PAN_OK \
49                                         | FBINFO_HWACCEL_XPAN \
50                                         | FBINFO_HWACCEL_YPAN)
51
52 static void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
53                                      struct fb_var_screeninfo *var)
54 {
55         u32 dma2dcfg;
56         u32 pixeloff;
57
58         pixeloff = (var->xoffset * var->bits_per_pixel) & 0x1f;
59
60         dma2dcfg = ((var->xres_virtual - var->xres) * var->bits_per_pixel) / 8;
61         dma2dcfg |= pixeloff << ATMEL_LCDC_PIXELOFF_OFFSET;
62         lcdc_writel(sinfo, ATMEL_LCDC_DMA2DCFG, dma2dcfg);
63
64         /* Update configuration */
65         lcdc_writel(sinfo, ATMEL_LCDC_DMACON,
66                     lcdc_readl(sinfo, ATMEL_LCDC_DMACON)
67                     | ATMEL_LCDC_DMAUPDT);
68 }
69 #endif
70
71 static u32 contrast_ctr = ATMEL_LCDC_PS_DIV8
72                 | ATMEL_LCDC_POL_POSITIVE
73                 | ATMEL_LCDC_ENA_PWMENABLE;
74
75 #ifdef CONFIG_BACKLIGHT_ATMEL_LCDC
76
77 /* some bl->props field just changed */
78 static int atmel_bl_update_status(struct backlight_device *bl)
79 {
80         struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
81         int                     power = sinfo->bl_power;
82         int                     brightness = bl->props.brightness;
83
84         /* REVISIT there may be a meaningful difference between
85          * fb_blank and power ... there seem to be some cases
86          * this doesn't handle correctly.
87          */
88         if (bl->props.fb_blank != sinfo->bl_power)
89                 power = bl->props.fb_blank;
90         else if (bl->props.power != sinfo->bl_power)
91                 power = bl->props.power;
92
93         if (brightness < 0 && power == FB_BLANK_UNBLANK)
94                 brightness = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
95         else if (power != FB_BLANK_UNBLANK)
96                 brightness = 0;
97
98         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, brightness);
99         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR,
100                         brightness ? contrast_ctr : 0);
101
102         bl->props.fb_blank = bl->props.power = sinfo->bl_power = power;
103
104         return 0;
105 }
106
107 static int atmel_bl_get_brightness(struct backlight_device *bl)
108 {
109         struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
110
111         return lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
112 }
113
114 static const struct backlight_ops atmel_lcdc_bl_ops = {
115         .update_status = atmel_bl_update_status,
116         .get_brightness = atmel_bl_get_brightness,
117 };
118
119 static void init_backlight(struct atmel_lcdfb_info *sinfo)
120 {
121         struct backlight_properties props;
122         struct backlight_device *bl;
123
124         sinfo->bl_power = FB_BLANK_UNBLANK;
125
126         if (sinfo->backlight)
127                 return;
128
129         memset(&props, 0, sizeof(struct backlight_properties));
130         props.type = BACKLIGHT_RAW;
131         props.max_brightness = 0xff;
132         bl = backlight_device_register("backlight", &sinfo->pdev->dev, sinfo,
133                                        &atmel_lcdc_bl_ops, &props);
134         if (IS_ERR(bl)) {
135                 dev_err(&sinfo->pdev->dev, "error %ld on backlight register\n",
136                                 PTR_ERR(bl));
137                 return;
138         }
139         sinfo->backlight = bl;
140
141         bl->props.power = FB_BLANK_UNBLANK;
142         bl->props.fb_blank = FB_BLANK_UNBLANK;
143         bl->props.brightness = atmel_bl_get_brightness(bl);
144 }
145
146 static void exit_backlight(struct atmel_lcdfb_info *sinfo)
147 {
148         if (sinfo->backlight)
149                 backlight_device_unregister(sinfo->backlight);
150 }
151
152 #else
153
154 static void init_backlight(struct atmel_lcdfb_info *sinfo)
155 {
156         dev_warn(&sinfo->pdev->dev, "backlight control is not available\n");
157 }
158
159 static void exit_backlight(struct atmel_lcdfb_info *sinfo)
160 {
161 }
162
163 #endif
164
165 static void init_contrast(struct atmel_lcdfb_info *sinfo)
166 {
167         /* contrast pwm can be 'inverted' */
168         if (sinfo->lcdcon_pol_negative)
169                         contrast_ctr &= ~(ATMEL_LCDC_POL_POSITIVE);
170
171         /* have some default contrast/backlight settings */
172         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr);
173         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT);
174
175         if (sinfo->lcdcon_is_backlight)
176                 init_backlight(sinfo);
177 }
178
179
180 static struct fb_fix_screeninfo atmel_lcdfb_fix __initdata = {
181         .type           = FB_TYPE_PACKED_PIXELS,
182         .visual         = FB_VISUAL_TRUECOLOR,
183         .xpanstep       = 0,
184         .ypanstep       = 1,
185         .ywrapstep      = 0,
186         .accel          = FB_ACCEL_NONE,
187 };
188
189 static unsigned long compute_hozval(unsigned long xres, unsigned long lcdcon2)
190 {
191         unsigned long value;
192
193         if (!(cpu_is_at91sam9261() || cpu_is_at91sam9g10()
194                 || cpu_is_at32ap7000()))
195                 return xres;
196
197         value = xres;
198         if ((lcdcon2 & ATMEL_LCDC_DISTYPE) != ATMEL_LCDC_DISTYPE_TFT) {
199                 /* STN display */
200                 if ((lcdcon2 & ATMEL_LCDC_DISTYPE) == ATMEL_LCDC_DISTYPE_STNCOLOR) {
201                         value *= 3;
202                 }
203                 if ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_4
204                    || ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_8
205                       && (lcdcon2 & ATMEL_LCDC_SCANMOD) == ATMEL_LCDC_SCANMOD_DUAL ))
206                         value = DIV_ROUND_UP(value, 4);
207                 else
208                         value = DIV_ROUND_UP(value, 8);
209         }
210
211         return value;
212 }
213
214 static void atmel_lcdfb_stop_nowait(struct atmel_lcdfb_info *sinfo)
215 {
216         /* Turn off the LCD controller and the DMA controller */
217         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
218                         sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET);
219
220         /* Wait for the LCDC core to become idle */
221         while (lcdc_readl(sinfo, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY)
222                 msleep(10);
223
224         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, 0);
225 }
226
227 static void atmel_lcdfb_stop(struct atmel_lcdfb_info *sinfo)
228 {
229         atmel_lcdfb_stop_nowait(sinfo);
230
231         /* Wait for DMA engine to become idle... */
232         while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
233                 msleep(10);
234 }
235
236 static void atmel_lcdfb_start(struct atmel_lcdfb_info *sinfo)
237 {
238         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, sinfo->default_dmacon);
239         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
240                 (sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET)
241                 | ATMEL_LCDC_PWR);
242 }
243
244 static void atmel_lcdfb_update_dma(struct fb_info *info,
245                                struct fb_var_screeninfo *var)
246 {
247         struct atmel_lcdfb_info *sinfo = info->par;
248         struct fb_fix_screeninfo *fix = &info->fix;
249         unsigned long dma_addr;
250
251         dma_addr = (fix->smem_start + var->yoffset * fix->line_length
252                     + var->xoffset * var->bits_per_pixel / 8);
253
254         dma_addr &= ~3UL;
255
256         /* Set framebuffer DMA base address and pixel offset */
257         lcdc_writel(sinfo, ATMEL_LCDC_DMABADDR1, dma_addr);
258
259         atmel_lcdfb_update_dma2d(sinfo, var);
260 }
261
262 static inline void atmel_lcdfb_free_video_memory(struct atmel_lcdfb_info *sinfo)
263 {
264         struct fb_info *info = sinfo->info;
265
266         dma_free_writecombine(info->device, info->fix.smem_len,
267                                 info->screen_base, info->fix.smem_start);
268 }
269
270 /**
271  *      atmel_lcdfb_alloc_video_memory - Allocate framebuffer memory
272  *      @sinfo: the frame buffer to allocate memory for
273  *      
274  *      This function is called only from the atmel_lcdfb_probe()
275  *      so no locking by fb_info->mm_lock around smem_len setting is needed.
276  */
277 static int atmel_lcdfb_alloc_video_memory(struct atmel_lcdfb_info *sinfo)
278 {
279         struct fb_info *info = sinfo->info;
280         struct fb_var_screeninfo *var = &info->var;
281         unsigned int smem_len;
282
283         smem_len = (var->xres_virtual * var->yres_virtual
284                     * ((var->bits_per_pixel + 7) / 8));
285         info->fix.smem_len = max(smem_len, sinfo->smem_len);
286
287         info->screen_base = dma_alloc_writecombine(info->device, info->fix.smem_len,
288                                         (dma_addr_t *)&info->fix.smem_start, GFP_KERNEL);
289
290         if (!info->screen_base) {
291                 return -ENOMEM;
292         }
293
294         memset(info->screen_base, 0, info->fix.smem_len);
295
296         return 0;
297 }
298
299 static const struct fb_videomode *atmel_lcdfb_choose_mode(struct fb_var_screeninfo *var,
300                                                      struct fb_info *info)
301 {
302         struct fb_videomode varfbmode;
303         const struct fb_videomode *fbmode = NULL;
304
305         fb_var_to_videomode(&varfbmode, var);
306         fbmode = fb_find_nearest_mode(&varfbmode, &info->modelist);
307         if (fbmode)
308                 fb_videomode_to_var(var, fbmode);
309         return fbmode;
310 }
311
312
313 /**
314  *      atmel_lcdfb_check_var - Validates a var passed in.
315  *      @var: frame buffer variable screen structure
316  *      @info: frame buffer structure that represents a single frame buffer
317  *
318  *      Checks to see if the hardware supports the state requested by
319  *      var passed in. This function does not alter the hardware
320  *      state!!!  This means the data stored in struct fb_info and
321  *      struct atmel_lcdfb_info do not change. This includes the var
322  *      inside of struct fb_info.  Do NOT change these. This function
323  *      can be called on its own if we intent to only test a mode and
324  *      not actually set it. The stuff in modedb.c is a example of
325  *      this. If the var passed in is slightly off by what the
326  *      hardware can support then we alter the var PASSED in to what
327  *      we can do. If the hardware doesn't support mode change a
328  *      -EINVAL will be returned by the upper layers. You don't need
329  *      to implement this function then. If you hardware doesn't
330  *      support changing the resolution then this function is not
331  *      needed. In this case the driver would just provide a var that
332  *      represents the static state the screen is in.
333  *
334  *      Returns negative errno on error, or zero on success.
335  */
336 static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var,
337                              struct fb_info *info)
338 {
339         struct device *dev = info->device;
340         struct atmel_lcdfb_info *sinfo = info->par;
341         unsigned long clk_value_khz;
342
343         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
344
345         dev_dbg(dev, "%s:\n", __func__);
346
347         if (!(var->pixclock && var->bits_per_pixel)) {
348                 /* choose a suitable mode if possible */
349                 if (!atmel_lcdfb_choose_mode(var, info)) {
350                         dev_err(dev, "needed value not specified\n");
351                         return -EINVAL;
352                 }
353         }
354
355         dev_dbg(dev, "  resolution: %ux%u\n", var->xres, var->yres);
356         dev_dbg(dev, "  pixclk:     %lu KHz\n", PICOS2KHZ(var->pixclock));
357         dev_dbg(dev, "  bpp:        %u\n", var->bits_per_pixel);
358         dev_dbg(dev, "  clk:        %lu KHz\n", clk_value_khz);
359
360         if (PICOS2KHZ(var->pixclock) > clk_value_khz) {
361                 dev_err(dev, "%lu KHz pixel clock is too fast\n", PICOS2KHZ(var->pixclock));
362                 return -EINVAL;
363         }
364
365         /* Do not allow to have real resoulution larger than virtual */
366         if (var->xres > var->xres_virtual)
367                 var->xres_virtual = var->xres;
368
369         if (var->yres > var->yres_virtual)
370                 var->yres_virtual = var->yres;
371
372         /* Force same alignment for each line */
373         var->xres = (var->xres + 3) & ~3UL;
374         var->xres_virtual = (var->xres_virtual + 3) & ~3UL;
375
376         var->red.msb_right = var->green.msb_right = var->blue.msb_right = 0;
377         var->transp.msb_right = 0;
378         var->transp.offset = var->transp.length = 0;
379         var->xoffset = var->yoffset = 0;
380
381         if (info->fix.smem_len) {
382                 unsigned int smem_len = (var->xres_virtual * var->yres_virtual
383                                          * ((var->bits_per_pixel + 7) / 8));
384                 if (smem_len > info->fix.smem_len)
385                         return -EINVAL;
386         }
387
388         /* Saturate vertical and horizontal timings at maximum values */
389         var->vsync_len = min_t(u32, var->vsync_len,
390                         (ATMEL_LCDC_VPW >> ATMEL_LCDC_VPW_OFFSET) + 1);
391         var->upper_margin = min_t(u32, var->upper_margin,
392                         ATMEL_LCDC_VBP >> ATMEL_LCDC_VBP_OFFSET);
393         var->lower_margin = min_t(u32, var->lower_margin,
394                         ATMEL_LCDC_VFP);
395         var->right_margin = min_t(u32, var->right_margin,
396                         (ATMEL_LCDC_HFP >> ATMEL_LCDC_HFP_OFFSET) + 1);
397         var->hsync_len = min_t(u32, var->hsync_len,
398                         (ATMEL_LCDC_HPW >> ATMEL_LCDC_HPW_OFFSET) + 1);
399         var->left_margin = min_t(u32, var->left_margin,
400                         ATMEL_LCDC_HBP + 1);
401
402         /* Some parameters can't be zero */
403         var->vsync_len = max_t(u32, var->vsync_len, 1);
404         var->right_margin = max_t(u32, var->right_margin, 1);
405         var->hsync_len = max_t(u32, var->hsync_len, 1);
406         var->left_margin = max_t(u32, var->left_margin, 1);
407
408         switch (var->bits_per_pixel) {
409         case 1:
410         case 2:
411         case 4:
412         case 8:
413                 var->red.offset = var->green.offset = var->blue.offset = 0;
414                 var->red.length = var->green.length = var->blue.length
415                         = var->bits_per_pixel;
416                 break;
417         case 15:
418         case 16:
419                 if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
420                         /* RGB:565 mode */
421                         var->red.offset = 11;
422                         var->blue.offset = 0;
423                         var->green.length = 6;
424                 } else if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB555) {
425                         var->red.offset = 10;
426                         var->blue.offset = 0;
427                         var->green.length = 5;
428                 } else {
429                         /* BGR:555 mode */
430                         var->red.offset = 0;
431                         var->blue.offset = 10;
432                         var->green.length = 5;
433                 }
434                 var->green.offset = 5;
435                 var->red.length = var->blue.length = 5;
436                 break;
437         case 32:
438                 var->transp.offset = 24;
439                 var->transp.length = 8;
440                 /* fall through */
441         case 24:
442                 if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
443                         /* RGB:888 mode */
444                         var->red.offset = 16;
445                         var->blue.offset = 0;
446                 } else {
447                         /* BGR:888 mode */
448                         var->red.offset = 0;
449                         var->blue.offset = 16;
450                 }
451                 var->green.offset = 8;
452                 var->red.length = var->green.length = var->blue.length = 8;
453                 break;
454         default:
455                 dev_err(dev, "color depth %d not supported\n",
456                                         var->bits_per_pixel);
457                 return -EINVAL;
458         }
459
460         return 0;
461 }
462
463 /*
464  * LCD reset sequence
465  */
466 static void atmel_lcdfb_reset(struct atmel_lcdfb_info *sinfo)
467 {
468         might_sleep();
469
470         atmel_lcdfb_stop(sinfo);
471         atmel_lcdfb_start(sinfo);
472 }
473
474 /**
475  *      atmel_lcdfb_set_par - Alters the hardware state.
476  *      @info: frame buffer structure that represents a single frame buffer
477  *
478  *      Using the fb_var_screeninfo in fb_info we set the resolution
479  *      of the this particular framebuffer. This function alters the
480  *      par AND the fb_fix_screeninfo stored in fb_info. It doesn't
481  *      not alter var in fb_info since we are using that data. This
482  *      means we depend on the data in var inside fb_info to be
483  *      supported by the hardware.  atmel_lcdfb_check_var is always called
484  *      before atmel_lcdfb_set_par to ensure this.  Again if you can't
485  *      change the resolution you don't need this function.
486  *
487  */
488 static int atmel_lcdfb_set_par(struct fb_info *info)
489 {
490         struct atmel_lcdfb_info *sinfo = info->par;
491         unsigned long hozval_linesz;
492         unsigned long value;
493         unsigned long clk_value_khz;
494         unsigned long bits_per_line;
495         unsigned long pix_factor = 2;
496
497         might_sleep();
498
499         dev_dbg(info->device, "%s:\n", __func__);
500         dev_dbg(info->device, "  * resolution: %ux%u (%ux%u virtual)\n",
501                  info->var.xres, info->var.yres,
502                  info->var.xres_virtual, info->var.yres_virtual);
503
504         atmel_lcdfb_stop_nowait(sinfo);
505
506         if (info->var.bits_per_pixel == 1)
507                 info->fix.visual = FB_VISUAL_MONO01;
508         else if (info->var.bits_per_pixel <= 8)
509                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
510         else
511                 info->fix.visual = FB_VISUAL_TRUECOLOR;
512
513         bits_per_line = info->var.xres_virtual * info->var.bits_per_pixel;
514         info->fix.line_length = DIV_ROUND_UP(bits_per_line, 8);
515
516         /* Re-initialize the DMA engine... */
517         dev_dbg(info->device, "  * update DMA engine\n");
518         atmel_lcdfb_update_dma(info, &info->var);
519
520         /* ...set frame size and burst length = 8 words (?) */
521         value = (info->var.yres * info->var.xres * info->var.bits_per_pixel) / 32;
522         value |= ((ATMEL_LCDC_DMA_BURST_LEN - 1) << ATMEL_LCDC_BLENGTH_OFFSET);
523         lcdc_writel(sinfo, ATMEL_LCDC_DMAFRMCFG, value);
524
525         /* Now, the LCDC core... */
526
527         /* Set pixel clock */
528         if (cpu_is_at91sam9g45() && !cpu_is_at91sam9g45es())
529                 pix_factor = 1;
530
531         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
532
533         value = DIV_ROUND_UP(clk_value_khz, PICOS2KHZ(info->var.pixclock));
534
535         if (value < pix_factor) {
536                 dev_notice(info->device, "Bypassing pixel clock divider\n");
537                 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS);
538         } else {
539                 value = (value / pix_factor) - 1;
540                 dev_dbg(info->device, "  * programming CLKVAL = 0x%08lx\n",
541                                 value);
542                 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1,
543                                 value << ATMEL_LCDC_CLKVAL_OFFSET);
544                 info->var.pixclock =
545                         KHZ2PICOS(clk_value_khz / (pix_factor * (value + 1)));
546                 dev_dbg(info->device, "  updated pixclk:     %lu KHz\n",
547                                         PICOS2KHZ(info->var.pixclock));
548         }
549
550
551         /* Initialize control register 2 */
552         value = sinfo->default_lcdcon2;
553
554         if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
555                 value |= ATMEL_LCDC_INVLINE_INVERTED;
556         if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
557                 value |= ATMEL_LCDC_INVFRAME_INVERTED;
558
559         switch (info->var.bits_per_pixel) {
560                 case 1: value |= ATMEL_LCDC_PIXELSIZE_1; break;
561                 case 2: value |= ATMEL_LCDC_PIXELSIZE_2; break;
562                 case 4: value |= ATMEL_LCDC_PIXELSIZE_4; break;
563                 case 8: value |= ATMEL_LCDC_PIXELSIZE_8; break;
564                 case 15: /* fall through */
565                 case 16: value |= ATMEL_LCDC_PIXELSIZE_16; break;
566                 case 24: value |= ATMEL_LCDC_PIXELSIZE_24; break;
567                 case 32: value |= ATMEL_LCDC_PIXELSIZE_32; break;
568                 default: BUG(); break;
569         }
570         dev_dbg(info->device, "  * LCDCON2 = %08lx\n", value);
571         lcdc_writel(sinfo, ATMEL_LCDC_LCDCON2, value);
572
573         /* Vertical timing */
574         value = (info->var.vsync_len - 1) << ATMEL_LCDC_VPW_OFFSET;
575         value |= info->var.upper_margin << ATMEL_LCDC_VBP_OFFSET;
576         value |= info->var.lower_margin;
577         dev_dbg(info->device, "  * LCDTIM1 = %08lx\n", value);
578         lcdc_writel(sinfo, ATMEL_LCDC_TIM1, value);
579
580         /* Horizontal timing */
581         value = (info->var.right_margin - 1) << ATMEL_LCDC_HFP_OFFSET;
582         value |= (info->var.hsync_len - 1) << ATMEL_LCDC_HPW_OFFSET;
583         value |= (info->var.left_margin - 1);
584         dev_dbg(info->device, "  * LCDTIM2 = %08lx\n", value);
585         lcdc_writel(sinfo, ATMEL_LCDC_TIM2, value);
586
587         /* Horizontal value (aka line size) */
588         hozval_linesz = compute_hozval(info->var.xres,
589                                         lcdc_readl(sinfo, ATMEL_LCDC_LCDCON2));
590
591         /* Display size */
592         value = (hozval_linesz - 1) << ATMEL_LCDC_HOZVAL_OFFSET;
593         value |= info->var.yres - 1;
594         dev_dbg(info->device, "  * LCDFRMCFG = %08lx\n", value);
595         lcdc_writel(sinfo, ATMEL_LCDC_LCDFRMCFG, value);
596
597         /* FIFO Threshold: Use formula from data sheet */
598         value = ATMEL_LCDC_FIFO_SIZE - (2 * ATMEL_LCDC_DMA_BURST_LEN + 3);
599         lcdc_writel(sinfo, ATMEL_LCDC_FIFO, value);
600
601         /* Toggle LCD_MODE every frame */
602         lcdc_writel(sinfo, ATMEL_LCDC_MVAL, 0);
603
604         /* Disable all interrupts */
605         lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
606         /* Enable FIFO & DMA errors */
607         lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
608
609         /* ...wait for DMA engine to become idle... */
610         while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
611                 msleep(10);
612
613         atmel_lcdfb_start(sinfo);
614
615         dev_dbg(info->device, "  * DONE\n");
616
617         return 0;
618 }
619
620 static inline unsigned int chan_to_field(unsigned int chan, const struct fb_bitfield *bf)
621 {
622         chan &= 0xffff;
623         chan >>= 16 - bf->length;
624         return chan << bf->offset;
625 }
626
627 /**
628  *      atmel_lcdfb_setcolreg - Optional function. Sets a color register.
629  *      @regno: Which register in the CLUT we are programming
630  *      @red: The red value which can be up to 16 bits wide
631  *      @green: The green value which can be up to 16 bits wide
632  *      @blue:  The blue value which can be up to 16 bits wide.
633  *      @transp: If supported the alpha value which can be up to 16 bits wide.
634  *      @info: frame buffer info structure
635  *
636  *      Set a single color register. The values supplied have a 16 bit
637  *      magnitude which needs to be scaled in this function for the hardware.
638  *      Things to take into consideration are how many color registers, if
639  *      any, are supported with the current color visual. With truecolor mode
640  *      no color palettes are supported. Here a pseudo palette is created
641  *      which we store the value in pseudo_palette in struct fb_info. For
642  *      pseudocolor mode we have a limited color palette. To deal with this
643  *      we can program what color is displayed for a particular pixel value.
644  *      DirectColor is similar in that we can program each color field. If
645  *      we have a static colormap we don't need to implement this function.
646  *
647  *      Returns negative errno on error, or zero on success. In an
648  *      ideal world, this would have been the case, but as it turns
649  *      out, the other drivers return 1 on failure, so that's what
650  *      we're going to do.
651  */
652 static int atmel_lcdfb_setcolreg(unsigned int regno, unsigned int red,
653                              unsigned int green, unsigned int blue,
654                              unsigned int transp, struct fb_info *info)
655 {
656         struct atmel_lcdfb_info *sinfo = info->par;
657         unsigned int val;
658         u32 *pal;
659         int ret = 1;
660
661         if (info->var.grayscale)
662                 red = green = blue = (19595 * red + 38470 * green
663                                       + 7471 * blue) >> 16;
664
665         switch (info->fix.visual) {
666         case FB_VISUAL_TRUECOLOR:
667                 if (regno < 16) {
668                         pal = info->pseudo_palette;
669
670                         val  = chan_to_field(red, &info->var.red);
671                         val |= chan_to_field(green, &info->var.green);
672                         val |= chan_to_field(blue, &info->var.blue);
673
674                         pal[regno] = val;
675                         ret = 0;
676                 }
677                 break;
678
679         case FB_VISUAL_PSEUDOCOLOR:
680                 if (regno < 256) {
681                         val  = ((red   >> 11) & 0x001f);
682                         val |= ((green >>  6) & 0x03e0);
683                         val |= ((blue  >>  1) & 0x7c00);
684
685                         /*
686                          * TODO: intensity bit. Maybe something like
687                          *   ~(red[10] ^ green[10] ^ blue[10]) & 1
688                          */
689
690                         lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
691                         ret = 0;
692                 }
693                 break;
694
695         case FB_VISUAL_MONO01:
696                 if (regno < 2) {
697                         val = (regno == 0) ? 0x00 : 0x1F;
698                         lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
699                         ret = 0;
700                 }
701                 break;
702
703         }
704
705         return ret;
706 }
707
708 static int atmel_lcdfb_pan_display(struct fb_var_screeninfo *var,
709                                struct fb_info *info)
710 {
711         dev_dbg(info->device, "%s\n", __func__);
712
713         atmel_lcdfb_update_dma(info, var);
714
715         return 0;
716 }
717
718 static int atmel_lcdfb_blank(int blank_mode, struct fb_info *info)
719 {
720         struct atmel_lcdfb_info *sinfo = info->par;
721
722         switch (blank_mode) {
723         case FB_BLANK_UNBLANK:
724         case FB_BLANK_NORMAL:
725                 atmel_lcdfb_start(sinfo);
726                 break;
727         case FB_BLANK_VSYNC_SUSPEND:
728         case FB_BLANK_HSYNC_SUSPEND:
729                 break;
730         case FB_BLANK_POWERDOWN:
731                 atmel_lcdfb_stop(sinfo);
732                 break;
733         default:
734                 return -EINVAL;
735         }
736
737         /* let fbcon do a soft blank for us */
738         return ((blank_mode == FB_BLANK_NORMAL) ? 1 : 0);
739 }
740
741 static struct fb_ops atmel_lcdfb_ops = {
742         .owner          = THIS_MODULE,
743         .fb_check_var   = atmel_lcdfb_check_var,
744         .fb_set_par     = atmel_lcdfb_set_par,
745         .fb_setcolreg   = atmel_lcdfb_setcolreg,
746         .fb_blank       = atmel_lcdfb_blank,
747         .fb_pan_display = atmel_lcdfb_pan_display,
748         .fb_fillrect    = cfb_fillrect,
749         .fb_copyarea    = cfb_copyarea,
750         .fb_imageblit   = cfb_imageblit,
751 };
752
753 static irqreturn_t atmel_lcdfb_interrupt(int irq, void *dev_id)
754 {
755         struct fb_info *info = dev_id;
756         struct atmel_lcdfb_info *sinfo = info->par;
757         u32 status;
758
759         status = lcdc_readl(sinfo, ATMEL_LCDC_ISR);
760         if (status & ATMEL_LCDC_UFLWI) {
761                 dev_warn(info->device, "FIFO underflow %#x\n", status);
762                 /* reset DMA and FIFO to avoid screen shifting */
763                 schedule_work(&sinfo->task);
764         }
765         lcdc_writel(sinfo, ATMEL_LCDC_ICR, status);
766         return IRQ_HANDLED;
767 }
768
769 /*
770  * LCD controller task (to reset the LCD)
771  */
772 static void atmel_lcdfb_task(struct work_struct *work)
773 {
774         struct atmel_lcdfb_info *sinfo =
775                 container_of(work, struct atmel_lcdfb_info, task);
776
777         atmel_lcdfb_reset(sinfo);
778 }
779
780 static int __init atmel_lcdfb_init_fbinfo(struct atmel_lcdfb_info *sinfo)
781 {
782         struct fb_info *info = sinfo->info;
783         int ret = 0;
784
785         info->var.activate |= FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW;
786
787         dev_info(info->device,
788                "%luKiB frame buffer at %08lx (mapped at %p)\n",
789                (unsigned long)info->fix.smem_len / 1024,
790                (unsigned long)info->fix.smem_start,
791                info->screen_base);
792
793         /* Allocate colormap */
794         ret = fb_alloc_cmap(&info->cmap, 256, 0);
795         if (ret < 0)
796                 dev_err(info->device, "Alloc color map failed\n");
797
798         return ret;
799 }
800
801 static void atmel_lcdfb_start_clock(struct atmel_lcdfb_info *sinfo)
802 {
803         if (sinfo->bus_clk)
804                 clk_enable(sinfo->bus_clk);
805         clk_enable(sinfo->lcdc_clk);
806 }
807
808 static void atmel_lcdfb_stop_clock(struct atmel_lcdfb_info *sinfo)
809 {
810         if (sinfo->bus_clk)
811                 clk_disable(sinfo->bus_clk);
812         clk_disable(sinfo->lcdc_clk);
813 }
814
815
816 static int __init atmel_lcdfb_probe(struct platform_device *pdev)
817 {
818         struct device *dev = &pdev->dev;
819         struct fb_info *info;
820         struct atmel_lcdfb_info *sinfo;
821         struct atmel_lcdfb_info *pdata_sinfo;
822         struct fb_videomode fbmode;
823         struct resource *regs = NULL;
824         struct resource *map = NULL;
825         int ret;
826
827         dev_dbg(dev, "%s BEGIN\n", __func__);
828
829         ret = -ENOMEM;
830         info = framebuffer_alloc(sizeof(struct atmel_lcdfb_info), dev);
831         if (!info) {
832                 dev_err(dev, "cannot allocate memory\n");
833                 goto out;
834         }
835
836         sinfo = info->par;
837
838         if (dev->platform_data) {
839                 pdata_sinfo = (struct atmel_lcdfb_info *)dev->platform_data;
840                 sinfo->default_bpp = pdata_sinfo->default_bpp;
841                 sinfo->default_dmacon = pdata_sinfo->default_dmacon;
842                 sinfo->default_lcdcon2 = pdata_sinfo->default_lcdcon2;
843                 sinfo->default_monspecs = pdata_sinfo->default_monspecs;
844                 sinfo->atmel_lcdfb_power_control = pdata_sinfo->atmel_lcdfb_power_control;
845                 sinfo->guard_time = pdata_sinfo->guard_time;
846                 sinfo->smem_len = pdata_sinfo->smem_len;
847                 sinfo->lcdcon_is_backlight = pdata_sinfo->lcdcon_is_backlight;
848                 sinfo->lcdcon_pol_negative = pdata_sinfo->lcdcon_pol_negative;
849                 sinfo->lcd_wiring_mode = pdata_sinfo->lcd_wiring_mode;
850         } else {
851                 dev_err(dev, "cannot get default configuration\n");
852                 goto free_info;
853         }
854         sinfo->info = info;
855         sinfo->pdev = pdev;
856
857         strcpy(info->fix.id, sinfo->pdev->name);
858         info->flags = ATMEL_LCDFB_FBINFO_DEFAULT;
859         info->pseudo_palette = sinfo->pseudo_palette;
860         info->fbops = &atmel_lcdfb_ops;
861
862         memcpy(&info->monspecs, sinfo->default_monspecs, sizeof(info->monspecs));
863         info->fix = atmel_lcdfb_fix;
864
865         /* Enable LCDC Clocks */
866         if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()
867          || cpu_is_at32ap7000()) {
868                 sinfo->bus_clk = clk_get(dev, "hck1");
869                 if (IS_ERR(sinfo->bus_clk)) {
870                         ret = PTR_ERR(sinfo->bus_clk);
871                         goto free_info;
872                 }
873         }
874         sinfo->lcdc_clk = clk_get(dev, "lcdc_clk");
875         if (IS_ERR(sinfo->lcdc_clk)) {
876                 ret = PTR_ERR(sinfo->lcdc_clk);
877                 goto put_bus_clk;
878         }
879         atmel_lcdfb_start_clock(sinfo);
880
881         ret = fb_find_mode(&info->var, info, NULL, info->monspecs.modedb,
882                         info->monspecs.modedb_len, info->monspecs.modedb,
883                         sinfo->default_bpp);
884         if (!ret) {
885                 dev_err(dev, "no suitable video mode found\n");
886                 goto stop_clk;
887         }
888
889
890         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
891         if (!regs) {
892                 dev_err(dev, "resources unusable\n");
893                 ret = -ENXIO;
894                 goto stop_clk;
895         }
896
897         sinfo->irq_base = platform_get_irq(pdev, 0);
898         if (sinfo->irq_base < 0) {
899                 dev_err(dev, "unable to get irq\n");
900                 ret = sinfo->irq_base;
901                 goto stop_clk;
902         }
903
904         /* Initialize video memory */
905         map = platform_get_resource(pdev, IORESOURCE_MEM, 1);
906         if (map) {
907                 /* use a pre-allocated memory buffer */
908                 info->fix.smem_start = map->start;
909                 info->fix.smem_len = resource_size(map);
910                 if (!request_mem_region(info->fix.smem_start,
911                                         info->fix.smem_len, pdev->name)) {
912                         ret = -EBUSY;
913                         goto stop_clk;
914                 }
915
916                 info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
917                 if (!info->screen_base)
918                         goto release_intmem;
919
920                 /*
921                  * Don't clear the framebuffer -- someone may have set
922                  * up a splash image.
923                  */
924         } else {
925                 /* alocate memory buffer */
926                 ret = atmel_lcdfb_alloc_video_memory(sinfo);
927                 if (ret < 0) {
928                         dev_err(dev, "cannot allocate framebuffer: %d\n", ret);
929                         goto stop_clk;
930                 }
931         }
932
933         /* LCDC registers */
934         info->fix.mmio_start = regs->start;
935         info->fix.mmio_len = resource_size(regs);
936
937         if (!request_mem_region(info->fix.mmio_start,
938                                 info->fix.mmio_len, pdev->name)) {
939                 ret = -EBUSY;
940                 goto free_fb;
941         }
942
943         sinfo->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len);
944         if (!sinfo->mmio) {
945                 dev_err(dev, "cannot map LCDC registers\n");
946                 goto release_mem;
947         }
948
949         /* Initialize PWM for contrast or backlight ("off") */
950         init_contrast(sinfo);
951
952         /* interrupt */
953         ret = request_irq(sinfo->irq_base, atmel_lcdfb_interrupt, 0, pdev->name, info);
954         if (ret) {
955                 dev_err(dev, "request_irq failed: %d\n", ret);
956                 goto unmap_mmio;
957         }
958
959         /* Some operations on the LCDC might sleep and
960          * require a preemptible task context */
961         INIT_WORK(&sinfo->task, atmel_lcdfb_task);
962
963         ret = atmel_lcdfb_init_fbinfo(sinfo);
964         if (ret < 0) {
965                 dev_err(dev, "init fbinfo failed: %d\n", ret);
966                 goto unregister_irqs;
967         }
968
969         /*
970          * This makes sure that our colour bitfield
971          * descriptors are correctly initialised.
972          */
973         atmel_lcdfb_check_var(&info->var, info);
974
975         ret = fb_set_var(info, &info->var);
976         if (ret) {
977                 dev_warn(dev, "unable to set display parameters\n");
978                 goto free_cmap;
979         }
980
981         dev_set_drvdata(dev, info);
982
983         /*
984          * Tell the world that we're ready to go
985          */
986         ret = register_framebuffer(info);
987         if (ret < 0) {
988                 dev_err(dev, "failed to register framebuffer device: %d\n", ret);
989                 goto reset_drvdata;
990         }
991
992         /* add selected videomode to modelist */
993         fb_var_to_videomode(&fbmode, &info->var);
994         fb_add_videomode(&fbmode, &info->modelist);
995
996         /* Power up the LCDC screen */
997         if (sinfo->atmel_lcdfb_power_control)
998                 sinfo->atmel_lcdfb_power_control(1);
999
1000         dev_info(dev, "fb%d: Atmel LCDC at 0x%08lx (mapped at %p), irq %d\n",
1001                        info->node, info->fix.mmio_start, sinfo->mmio, sinfo->irq_base);
1002
1003         return 0;
1004
1005 reset_drvdata:
1006         dev_set_drvdata(dev, NULL);
1007 free_cmap:
1008         fb_dealloc_cmap(&info->cmap);
1009 unregister_irqs:
1010         cancel_work_sync(&sinfo->task);
1011         free_irq(sinfo->irq_base, info);
1012 unmap_mmio:
1013         exit_backlight(sinfo);
1014         iounmap(sinfo->mmio);
1015 release_mem:
1016         release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1017 free_fb:
1018         if (map)
1019                 iounmap(info->screen_base);
1020         else
1021                 atmel_lcdfb_free_video_memory(sinfo);
1022
1023 release_intmem:
1024         if (map)
1025                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1026 stop_clk:
1027         atmel_lcdfb_stop_clock(sinfo);
1028         clk_put(sinfo->lcdc_clk);
1029 put_bus_clk:
1030         if (sinfo->bus_clk)
1031                 clk_put(sinfo->bus_clk);
1032 free_info:
1033         framebuffer_release(info);
1034 out:
1035         dev_dbg(dev, "%s FAILED\n", __func__);
1036         return ret;
1037 }
1038
1039 static int __exit atmel_lcdfb_remove(struct platform_device *pdev)
1040 {
1041         struct device *dev = &pdev->dev;
1042         struct fb_info *info = dev_get_drvdata(dev);
1043         struct atmel_lcdfb_info *sinfo;
1044
1045         if (!info || !info->par)
1046                 return 0;
1047         sinfo = info->par;
1048
1049         cancel_work_sync(&sinfo->task);
1050         exit_backlight(sinfo);
1051         if (sinfo->atmel_lcdfb_power_control)
1052                 sinfo->atmel_lcdfb_power_control(0);
1053         unregister_framebuffer(info);
1054         atmel_lcdfb_stop_clock(sinfo);
1055         clk_put(sinfo->lcdc_clk);
1056         if (sinfo->bus_clk)
1057                 clk_put(sinfo->bus_clk);
1058         fb_dealloc_cmap(&info->cmap);
1059         free_irq(sinfo->irq_base, info);
1060         iounmap(sinfo->mmio);
1061         release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1062         if (platform_get_resource(pdev, IORESOURCE_MEM, 1)) {
1063                 iounmap(info->screen_base);
1064                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1065         } else {
1066                 atmel_lcdfb_free_video_memory(sinfo);
1067         }
1068
1069         dev_set_drvdata(dev, NULL);
1070         framebuffer_release(info);
1071
1072         return 0;
1073 }
1074
1075 #ifdef CONFIG_PM
1076
1077 static int atmel_lcdfb_suspend(struct platform_device *pdev, pm_message_t mesg)
1078 {
1079         struct fb_info *info = platform_get_drvdata(pdev);
1080         struct atmel_lcdfb_info *sinfo = info->par;
1081
1082         /*
1083          * We don't want to handle interrupts while the clock is
1084          * stopped. It may take forever.
1085          */
1086         lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
1087
1088         sinfo->saved_lcdcon = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
1089         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, 0);
1090         if (sinfo->atmel_lcdfb_power_control)
1091                 sinfo->atmel_lcdfb_power_control(0);
1092
1093         atmel_lcdfb_stop(sinfo);
1094         atmel_lcdfb_stop_clock(sinfo);
1095
1096         return 0;
1097 }
1098
1099 static int atmel_lcdfb_resume(struct platform_device *pdev)
1100 {
1101         struct fb_info *info = platform_get_drvdata(pdev);
1102         struct atmel_lcdfb_info *sinfo = info->par;
1103
1104         atmel_lcdfb_start_clock(sinfo);
1105         atmel_lcdfb_start(sinfo);
1106         if (sinfo->atmel_lcdfb_power_control)
1107                 sinfo->atmel_lcdfb_power_control(1);
1108         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, sinfo->saved_lcdcon);
1109
1110         /* Enable FIFO & DMA errors */
1111         lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI
1112                         | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
1113
1114         return 0;
1115 }
1116
1117 #else
1118 #define atmel_lcdfb_suspend     NULL
1119 #define atmel_lcdfb_resume      NULL
1120 #endif
1121
1122 static struct platform_driver atmel_lcdfb_driver = {
1123         .remove         = __exit_p(atmel_lcdfb_remove),
1124         .suspend        = atmel_lcdfb_suspend,
1125         .resume         = atmel_lcdfb_resume,
1126
1127         .driver         = {
1128                 .name   = "atmel_lcdfb",
1129                 .owner  = THIS_MODULE,
1130         },
1131 };
1132
1133 static int __init atmel_lcdfb_init(void)
1134 {
1135         return platform_driver_probe(&atmel_lcdfb_driver, atmel_lcdfb_probe);
1136 }
1137
1138 static void __exit atmel_lcdfb_exit(void)
1139 {
1140         platform_driver_unregister(&atmel_lcdfb_driver);
1141 }
1142
1143 module_init(atmel_lcdfb_init);
1144 module_exit(atmel_lcdfb_exit);
1145
1146 MODULE_DESCRIPTION("AT91/AT32 LCD Controller framebuffer driver");
1147 MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
1148 MODULE_LICENSE("GPL");