Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[firefly-linux-kernel-4.4.55.git] / drivers / video / fbdev / 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 #include <linux/module.h>
22 #include <linux/of.h>
23 #include <linux/of_device.h>
24 #include <linux/of_gpio.h>
25 #include <video/of_display_timing.h>
26 #include <linux/regulator/consumer.h>
27 #include <video/videomode.h>
28
29 #include <asm/gpio.h>
30
31 #include <video/atmel_lcdc.h>
32
33 struct atmel_lcdfb_config {
34         bool have_alt_pixclock;
35         bool have_hozval;
36         bool have_intensity_bit;
37 };
38
39  /* LCD Controller info data structure, stored in device platform_data */
40 struct atmel_lcdfb_info {
41         spinlock_t              lock;
42         struct fb_info          *info;
43         void __iomem            *mmio;
44         int                     irq_base;
45         struct work_struct      task;
46
47         unsigned int            smem_len;
48         struct platform_device  *pdev;
49         struct clk              *bus_clk;
50         struct clk              *lcdc_clk;
51
52         struct backlight_device *backlight;
53         u8                      bl_power;
54         u8                      saved_lcdcon;
55
56         u32                     pseudo_palette[16];
57         bool                    have_intensity_bit;
58
59         struct atmel_lcdfb_pdata pdata;
60
61         struct atmel_lcdfb_config *config;
62         struct regulator        *reg_lcd;
63 };
64
65 struct atmel_lcdfb_power_ctrl_gpio {
66         int gpio;
67         int active_low;
68
69         struct list_head list;
70 };
71
72 #define lcdc_readl(sinfo, reg)          __raw_readl((sinfo)->mmio+(reg))
73 #define lcdc_writel(sinfo, reg, val)    __raw_writel((val), (sinfo)->mmio+(reg))
74
75 /* configurable parameters */
76 #define ATMEL_LCDC_CVAL_DEFAULT         0xc8
77 #define ATMEL_LCDC_DMA_BURST_LEN        8       /* words */
78 #define ATMEL_LCDC_FIFO_SIZE            512     /* words */
79
80 static struct atmel_lcdfb_config at91sam9261_config = {
81         .have_hozval            = true,
82         .have_intensity_bit     = true,
83 };
84
85 static struct atmel_lcdfb_config at91sam9263_config = {
86         .have_intensity_bit     = true,
87 };
88
89 static struct atmel_lcdfb_config at91sam9g10_config = {
90         .have_hozval            = true,
91 };
92
93 static struct atmel_lcdfb_config at91sam9g45_config = {
94         .have_alt_pixclock      = true,
95 };
96
97 static struct atmel_lcdfb_config at91sam9g45es_config = {
98 };
99
100 static struct atmel_lcdfb_config at91sam9rl_config = {
101         .have_intensity_bit     = true,
102 };
103
104 static struct atmel_lcdfb_config at32ap_config = {
105         .have_hozval            = true,
106 };
107
108 static const struct platform_device_id atmel_lcdfb_devtypes[] = {
109         {
110                 .name = "at91sam9261-lcdfb",
111                 .driver_data = (unsigned long)&at91sam9261_config,
112         }, {
113                 .name = "at91sam9263-lcdfb",
114                 .driver_data = (unsigned long)&at91sam9263_config,
115         }, {
116                 .name = "at91sam9g10-lcdfb",
117                 .driver_data = (unsigned long)&at91sam9g10_config,
118         }, {
119                 .name = "at91sam9g45-lcdfb",
120                 .driver_data = (unsigned long)&at91sam9g45_config,
121         }, {
122                 .name = "at91sam9g45es-lcdfb",
123                 .driver_data = (unsigned long)&at91sam9g45es_config,
124         }, {
125                 .name = "at91sam9rl-lcdfb",
126                 .driver_data = (unsigned long)&at91sam9rl_config,
127         }, {
128                 .name = "at32ap-lcdfb",
129                 .driver_data = (unsigned long)&at32ap_config,
130         }, {
131                 /* terminator */
132         }
133 };
134 MODULE_DEVICE_TABLE(platform, atmel_lcdfb_devtypes);
135
136 static struct atmel_lcdfb_config *
137 atmel_lcdfb_get_config(struct platform_device *pdev)
138 {
139         unsigned long data;
140
141         data = platform_get_device_id(pdev)->driver_data;
142
143         return (struct atmel_lcdfb_config *)data;
144 }
145
146 #if defined(CONFIG_ARCH_AT91)
147 #define ATMEL_LCDFB_FBINFO_DEFAULT      (FBINFO_DEFAULT \
148                                          | FBINFO_PARTIAL_PAN_OK \
149                                          | FBINFO_HWACCEL_YPAN)
150
151 static inline void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
152                                         struct fb_var_screeninfo *var,
153                                         struct fb_info *info)
154 {
155
156 }
157 #elif defined(CONFIG_AVR32)
158 #define ATMEL_LCDFB_FBINFO_DEFAULT      (FBINFO_DEFAULT \
159                                         | FBINFO_PARTIAL_PAN_OK \
160                                         | FBINFO_HWACCEL_XPAN \
161                                         | FBINFO_HWACCEL_YPAN)
162
163 static void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
164                                      struct fb_var_screeninfo *var,
165                                      struct fb_info *info)
166 {
167         u32 dma2dcfg;
168         u32 pixeloff;
169
170         pixeloff = (var->xoffset * info->var.bits_per_pixel) & 0x1f;
171
172         dma2dcfg = (info->var.xres_virtual - info->var.xres)
173                  * info->var.bits_per_pixel / 8;
174         dma2dcfg |= pixeloff << ATMEL_LCDC_PIXELOFF_OFFSET;
175         lcdc_writel(sinfo, ATMEL_LCDC_DMA2DCFG, dma2dcfg);
176
177         /* Update configuration */
178         lcdc_writel(sinfo, ATMEL_LCDC_DMACON,
179                     lcdc_readl(sinfo, ATMEL_LCDC_DMACON)
180                     | ATMEL_LCDC_DMAUPDT);
181 }
182 #endif
183
184 static u32 contrast_ctr = ATMEL_LCDC_PS_DIV8
185                 | ATMEL_LCDC_POL_POSITIVE
186                 | ATMEL_LCDC_ENA_PWMENABLE;
187
188 #ifdef CONFIG_BACKLIGHT_ATMEL_LCDC
189
190 /* some bl->props field just changed */
191 static int atmel_bl_update_status(struct backlight_device *bl)
192 {
193         struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
194         int                     power = sinfo->bl_power;
195         int                     brightness = bl->props.brightness;
196
197         /* REVISIT there may be a meaningful difference between
198          * fb_blank and power ... there seem to be some cases
199          * this doesn't handle correctly.
200          */
201         if (bl->props.fb_blank != sinfo->bl_power)
202                 power = bl->props.fb_blank;
203         else if (bl->props.power != sinfo->bl_power)
204                 power = bl->props.power;
205
206         if (brightness < 0 && power == FB_BLANK_UNBLANK)
207                 brightness = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
208         else if (power != FB_BLANK_UNBLANK)
209                 brightness = 0;
210
211         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, brightness);
212         if (contrast_ctr & ATMEL_LCDC_POL_POSITIVE)
213                 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR,
214                         brightness ? contrast_ctr : 0);
215         else
216                 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr);
217
218         bl->props.fb_blank = bl->props.power = sinfo->bl_power = power;
219
220         return 0;
221 }
222
223 static int atmel_bl_get_brightness(struct backlight_device *bl)
224 {
225         struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
226
227         return lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
228 }
229
230 static const struct backlight_ops atmel_lcdc_bl_ops = {
231         .update_status = atmel_bl_update_status,
232         .get_brightness = atmel_bl_get_brightness,
233 };
234
235 static void init_backlight(struct atmel_lcdfb_info *sinfo)
236 {
237         struct backlight_properties props;
238         struct backlight_device *bl;
239
240         sinfo->bl_power = FB_BLANK_UNBLANK;
241
242         if (sinfo->backlight)
243                 return;
244
245         memset(&props, 0, sizeof(struct backlight_properties));
246         props.type = BACKLIGHT_RAW;
247         props.max_brightness = 0xff;
248         bl = backlight_device_register("backlight", &sinfo->pdev->dev, sinfo,
249                                        &atmel_lcdc_bl_ops, &props);
250         if (IS_ERR(bl)) {
251                 dev_err(&sinfo->pdev->dev, "error %ld on backlight register\n",
252                                 PTR_ERR(bl));
253                 return;
254         }
255         sinfo->backlight = bl;
256
257         bl->props.power = FB_BLANK_UNBLANK;
258         bl->props.fb_blank = FB_BLANK_UNBLANK;
259         bl->props.brightness = atmel_bl_get_brightness(bl);
260 }
261
262 static void exit_backlight(struct atmel_lcdfb_info *sinfo)
263 {
264         if (!sinfo->backlight)
265                 return;
266
267         if (sinfo->backlight->ops) {
268                 sinfo->backlight->props.power = FB_BLANK_POWERDOWN;
269                 sinfo->backlight->ops->update_status(sinfo->backlight);
270         }
271         backlight_device_unregister(sinfo->backlight);
272 }
273
274 #else
275
276 static void init_backlight(struct atmel_lcdfb_info *sinfo)
277 {
278         dev_warn(&sinfo->pdev->dev, "backlight control is not available\n");
279 }
280
281 static void exit_backlight(struct atmel_lcdfb_info *sinfo)
282 {
283 }
284
285 #endif
286
287 static void init_contrast(struct atmel_lcdfb_info *sinfo)
288 {
289         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
290
291         /* contrast pwm can be 'inverted' */
292         if (pdata->lcdcon_pol_negative)
293                 contrast_ctr &= ~(ATMEL_LCDC_POL_POSITIVE);
294
295         /* have some default contrast/backlight settings */
296         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr);
297         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT);
298
299         if (pdata->lcdcon_is_backlight)
300                 init_backlight(sinfo);
301 }
302
303 static inline void atmel_lcdfb_power_control(struct atmel_lcdfb_info *sinfo, int on)
304 {
305         int ret;
306         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
307
308         if (pdata->atmel_lcdfb_power_control)
309                 pdata->atmel_lcdfb_power_control(pdata, on);
310         else if (sinfo->reg_lcd) {
311                 if (on) {
312                         ret = regulator_enable(sinfo->reg_lcd);
313                         if (ret)
314                                 dev_err(&sinfo->pdev->dev,
315                                         "lcd regulator enable failed:   %d\n", ret);
316                 } else {
317                         ret = regulator_disable(sinfo->reg_lcd);
318                         if (ret)
319                                 dev_err(&sinfo->pdev->dev,
320                                         "lcd regulator disable failed: %d\n", ret);
321                 }
322         }
323 }
324
325 static struct fb_fix_screeninfo atmel_lcdfb_fix __initdata = {
326         .type           = FB_TYPE_PACKED_PIXELS,
327         .visual         = FB_VISUAL_TRUECOLOR,
328         .xpanstep       = 0,
329         .ypanstep       = 1,
330         .ywrapstep      = 0,
331         .accel          = FB_ACCEL_NONE,
332 };
333
334 static unsigned long compute_hozval(struct atmel_lcdfb_info *sinfo,
335                                                         unsigned long xres)
336 {
337         unsigned long lcdcon2;
338         unsigned long value;
339
340         if (!sinfo->config->have_hozval)
341                 return xres;
342
343         lcdcon2 = lcdc_readl(sinfo, ATMEL_LCDC_LCDCON2);
344         value = xres;
345         if ((lcdcon2 & ATMEL_LCDC_DISTYPE) != ATMEL_LCDC_DISTYPE_TFT) {
346                 /* STN display */
347                 if ((lcdcon2 & ATMEL_LCDC_DISTYPE) == ATMEL_LCDC_DISTYPE_STNCOLOR) {
348                         value *= 3;
349                 }
350                 if ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_4
351                    || ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_8
352                       && (lcdcon2 & ATMEL_LCDC_SCANMOD) == ATMEL_LCDC_SCANMOD_DUAL ))
353                         value = DIV_ROUND_UP(value, 4);
354                 else
355                         value = DIV_ROUND_UP(value, 8);
356         }
357
358         return value;
359 }
360
361 static void atmel_lcdfb_stop_nowait(struct atmel_lcdfb_info *sinfo)
362 {
363         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
364
365         /* Turn off the LCD controller and the DMA controller */
366         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
367                         pdata->guard_time << ATMEL_LCDC_GUARDT_OFFSET);
368
369         /* Wait for the LCDC core to become idle */
370         while (lcdc_readl(sinfo, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY)
371                 msleep(10);
372
373         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, 0);
374 }
375
376 static void atmel_lcdfb_stop(struct atmel_lcdfb_info *sinfo)
377 {
378         atmel_lcdfb_stop_nowait(sinfo);
379
380         /* Wait for DMA engine to become idle... */
381         while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
382                 msleep(10);
383 }
384
385 static void atmel_lcdfb_start(struct atmel_lcdfb_info *sinfo)
386 {
387         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
388
389         lcdc_writel(sinfo, ATMEL_LCDC_DMACON, pdata->default_dmacon);
390         lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
391                 (pdata->guard_time << ATMEL_LCDC_GUARDT_OFFSET)
392                 | ATMEL_LCDC_PWR);
393 }
394
395 static void atmel_lcdfb_update_dma(struct fb_info *info,
396                                struct fb_var_screeninfo *var)
397 {
398         struct atmel_lcdfb_info *sinfo = info->par;
399         struct fb_fix_screeninfo *fix = &info->fix;
400         unsigned long dma_addr;
401
402         dma_addr = (fix->smem_start + var->yoffset * fix->line_length
403                     + var->xoffset * info->var.bits_per_pixel / 8);
404
405         dma_addr &= ~3UL;
406
407         /* Set framebuffer DMA base address and pixel offset */
408         lcdc_writel(sinfo, ATMEL_LCDC_DMABADDR1, dma_addr);
409
410         atmel_lcdfb_update_dma2d(sinfo, var, info);
411 }
412
413 static inline void atmel_lcdfb_free_video_memory(struct atmel_lcdfb_info *sinfo)
414 {
415         struct fb_info *info = sinfo->info;
416
417         dma_free_writecombine(info->device, info->fix.smem_len,
418                                 info->screen_base, info->fix.smem_start);
419 }
420
421 /**
422  *      atmel_lcdfb_alloc_video_memory - Allocate framebuffer memory
423  *      @sinfo: the frame buffer to allocate memory for
424  *      
425  *      This function is called only from the atmel_lcdfb_probe()
426  *      so no locking by fb_info->mm_lock around smem_len setting is needed.
427  */
428 static int atmel_lcdfb_alloc_video_memory(struct atmel_lcdfb_info *sinfo)
429 {
430         struct fb_info *info = sinfo->info;
431         struct fb_var_screeninfo *var = &info->var;
432         unsigned int smem_len;
433
434         smem_len = (var->xres_virtual * var->yres_virtual
435                     * ((var->bits_per_pixel + 7) / 8));
436         info->fix.smem_len = max(smem_len, sinfo->smem_len);
437
438         info->screen_base = dma_alloc_writecombine(info->device, info->fix.smem_len,
439                                         (dma_addr_t *)&info->fix.smem_start, GFP_KERNEL);
440
441         if (!info->screen_base) {
442                 return -ENOMEM;
443         }
444
445         memset(info->screen_base, 0, info->fix.smem_len);
446
447         return 0;
448 }
449
450 static const struct fb_videomode *atmel_lcdfb_choose_mode(struct fb_var_screeninfo *var,
451                                                      struct fb_info *info)
452 {
453         struct fb_videomode varfbmode;
454         const struct fb_videomode *fbmode = NULL;
455
456         fb_var_to_videomode(&varfbmode, var);
457         fbmode = fb_find_nearest_mode(&varfbmode, &info->modelist);
458         if (fbmode)
459                 fb_videomode_to_var(var, fbmode);
460         return fbmode;
461 }
462
463
464 /**
465  *      atmel_lcdfb_check_var - Validates a var passed in.
466  *      @var: frame buffer variable screen structure
467  *      @info: frame buffer structure that represents a single frame buffer
468  *
469  *      Checks to see if the hardware supports the state requested by
470  *      var passed in. This function does not alter the hardware
471  *      state!!!  This means the data stored in struct fb_info and
472  *      struct atmel_lcdfb_info do not change. This includes the var
473  *      inside of struct fb_info.  Do NOT change these. This function
474  *      can be called on its own if we intent to only test a mode and
475  *      not actually set it. The stuff in modedb.c is a example of
476  *      this. If the var passed in is slightly off by what the
477  *      hardware can support then we alter the var PASSED in to what
478  *      we can do. If the hardware doesn't support mode change a
479  *      -EINVAL will be returned by the upper layers. You don't need
480  *      to implement this function then. If you hardware doesn't
481  *      support changing the resolution then this function is not
482  *      needed. In this case the driver would just provide a var that
483  *      represents the static state the screen is in.
484  *
485  *      Returns negative errno on error, or zero on success.
486  */
487 static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var,
488                              struct fb_info *info)
489 {
490         struct device *dev = info->device;
491         struct atmel_lcdfb_info *sinfo = info->par;
492         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
493         unsigned long clk_value_khz;
494
495         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
496
497         dev_dbg(dev, "%s:\n", __func__);
498
499         if (!(var->pixclock && var->bits_per_pixel)) {
500                 /* choose a suitable mode if possible */
501                 if (!atmel_lcdfb_choose_mode(var, info)) {
502                         dev_err(dev, "needed value not specified\n");
503                         return -EINVAL;
504                 }
505         }
506
507         dev_dbg(dev, "  resolution: %ux%u\n", var->xres, var->yres);
508         dev_dbg(dev, "  pixclk:     %lu KHz\n", PICOS2KHZ(var->pixclock));
509         dev_dbg(dev, "  bpp:        %u\n", var->bits_per_pixel);
510         dev_dbg(dev, "  clk:        %lu KHz\n", clk_value_khz);
511
512         if (PICOS2KHZ(var->pixclock) > clk_value_khz) {
513                 dev_err(dev, "%lu KHz pixel clock is too fast\n", PICOS2KHZ(var->pixclock));
514                 return -EINVAL;
515         }
516
517         /* Do not allow to have real resoulution larger than virtual */
518         if (var->xres > var->xres_virtual)
519                 var->xres_virtual = var->xres;
520
521         if (var->yres > var->yres_virtual)
522                 var->yres_virtual = var->yres;
523
524         /* Force same alignment for each line */
525         var->xres = (var->xres + 3) & ~3UL;
526         var->xres_virtual = (var->xres_virtual + 3) & ~3UL;
527
528         var->red.msb_right = var->green.msb_right = var->blue.msb_right = 0;
529         var->transp.msb_right = 0;
530         var->transp.offset = var->transp.length = 0;
531         var->xoffset = var->yoffset = 0;
532
533         if (info->fix.smem_len) {
534                 unsigned int smem_len = (var->xres_virtual * var->yres_virtual
535                                          * ((var->bits_per_pixel + 7) / 8));
536                 if (smem_len > info->fix.smem_len) {
537                         dev_err(dev, "Frame buffer is too small (%u) for screen size (need at least %u)\n",
538                                 info->fix.smem_len, smem_len);
539                         return -EINVAL;
540                 }
541         }
542
543         /* Saturate vertical and horizontal timings at maximum values */
544         var->vsync_len = min_t(u32, var->vsync_len,
545                         (ATMEL_LCDC_VPW >> ATMEL_LCDC_VPW_OFFSET) + 1);
546         var->upper_margin = min_t(u32, var->upper_margin,
547                         ATMEL_LCDC_VBP >> ATMEL_LCDC_VBP_OFFSET);
548         var->lower_margin = min_t(u32, var->lower_margin,
549                         ATMEL_LCDC_VFP);
550         var->right_margin = min_t(u32, var->right_margin,
551                         (ATMEL_LCDC_HFP >> ATMEL_LCDC_HFP_OFFSET) + 1);
552         var->hsync_len = min_t(u32, var->hsync_len,
553                         (ATMEL_LCDC_HPW >> ATMEL_LCDC_HPW_OFFSET) + 1);
554         var->left_margin = min_t(u32, var->left_margin,
555                         ATMEL_LCDC_HBP + 1);
556
557         /* Some parameters can't be zero */
558         var->vsync_len = max_t(u32, var->vsync_len, 1);
559         var->right_margin = max_t(u32, var->right_margin, 1);
560         var->hsync_len = max_t(u32, var->hsync_len, 1);
561         var->left_margin = max_t(u32, var->left_margin, 1);
562
563         switch (var->bits_per_pixel) {
564         case 1:
565         case 2:
566         case 4:
567         case 8:
568                 var->red.offset = var->green.offset = var->blue.offset = 0;
569                 var->red.length = var->green.length = var->blue.length
570                         = var->bits_per_pixel;
571                 break;
572         case 16:
573                 /* Older SOCs use IBGR:555 rather than BGR:565. */
574                 if (sinfo->config->have_intensity_bit)
575                         var->green.length = 5;
576                 else
577                         var->green.length = 6;
578
579                 if (pdata->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
580                         /* RGB:5X5 mode */
581                         var->red.offset = var->green.length + 5;
582                         var->blue.offset = 0;
583                 } else {
584                         /* BGR:5X5 mode */
585                         var->red.offset = 0;
586                         var->blue.offset = var->green.length + 5;
587                 }
588                 var->green.offset = 5;
589                 var->red.length = var->blue.length = 5;
590                 break;
591         case 32:
592                 var->transp.offset = 24;
593                 var->transp.length = 8;
594                 /* fall through */
595         case 24:
596                 if (pdata->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
597                         /* RGB:888 mode */
598                         var->red.offset = 16;
599                         var->blue.offset = 0;
600                 } else {
601                         /* BGR:888 mode */
602                         var->red.offset = 0;
603                         var->blue.offset = 16;
604                 }
605                 var->green.offset = 8;
606                 var->red.length = var->green.length = var->blue.length = 8;
607                 break;
608         default:
609                 dev_err(dev, "color depth %d not supported\n",
610                                         var->bits_per_pixel);
611                 return -EINVAL;
612         }
613
614         return 0;
615 }
616
617 /*
618  * LCD reset sequence
619  */
620 static void atmel_lcdfb_reset(struct atmel_lcdfb_info *sinfo)
621 {
622         might_sleep();
623
624         atmel_lcdfb_stop(sinfo);
625         atmel_lcdfb_start(sinfo);
626 }
627
628 /**
629  *      atmel_lcdfb_set_par - Alters the hardware state.
630  *      @info: frame buffer structure that represents a single frame buffer
631  *
632  *      Using the fb_var_screeninfo in fb_info we set the resolution
633  *      of the this particular framebuffer. This function alters the
634  *      par AND the fb_fix_screeninfo stored in fb_info. It doesn't
635  *      not alter var in fb_info since we are using that data. This
636  *      means we depend on the data in var inside fb_info to be
637  *      supported by the hardware.  atmel_lcdfb_check_var is always called
638  *      before atmel_lcdfb_set_par to ensure this.  Again if you can't
639  *      change the resolution you don't need this function.
640  *
641  */
642 static int atmel_lcdfb_set_par(struct fb_info *info)
643 {
644         struct atmel_lcdfb_info *sinfo = info->par;
645         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
646         unsigned long hozval_linesz;
647         unsigned long value;
648         unsigned long clk_value_khz;
649         unsigned long bits_per_line;
650         unsigned long pix_factor = 2;
651
652         might_sleep();
653
654         dev_dbg(info->device, "%s:\n", __func__);
655         dev_dbg(info->device, "  * resolution: %ux%u (%ux%u virtual)\n",
656                  info->var.xres, info->var.yres,
657                  info->var.xres_virtual, info->var.yres_virtual);
658
659         atmel_lcdfb_stop_nowait(sinfo);
660
661         if (info->var.bits_per_pixel == 1)
662                 info->fix.visual = FB_VISUAL_MONO01;
663         else if (info->var.bits_per_pixel <= 8)
664                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
665         else
666                 info->fix.visual = FB_VISUAL_TRUECOLOR;
667
668         bits_per_line = info->var.xres_virtual * info->var.bits_per_pixel;
669         info->fix.line_length = DIV_ROUND_UP(bits_per_line, 8);
670
671         /* Re-initialize the DMA engine... */
672         dev_dbg(info->device, "  * update DMA engine\n");
673         atmel_lcdfb_update_dma(info, &info->var);
674
675         /* ...set frame size and burst length = 8 words (?) */
676         value = (info->var.yres * info->var.xres * info->var.bits_per_pixel) / 32;
677         value |= ((ATMEL_LCDC_DMA_BURST_LEN - 1) << ATMEL_LCDC_BLENGTH_OFFSET);
678         lcdc_writel(sinfo, ATMEL_LCDC_DMAFRMCFG, value);
679
680         /* Now, the LCDC core... */
681
682         /* Set pixel clock */
683         if (sinfo->config->have_alt_pixclock)
684                 pix_factor = 1;
685
686         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
687
688         value = DIV_ROUND_UP(clk_value_khz, PICOS2KHZ(info->var.pixclock));
689
690         if (value < pix_factor) {
691                 dev_notice(info->device, "Bypassing pixel clock divider\n");
692                 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS);
693         } else {
694                 value = (value / pix_factor) - 1;
695                 dev_dbg(info->device, "  * programming CLKVAL = 0x%08lx\n",
696                                 value);
697                 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1,
698                                 value << ATMEL_LCDC_CLKVAL_OFFSET);
699                 info->var.pixclock =
700                         KHZ2PICOS(clk_value_khz / (pix_factor * (value + 1)));
701                 dev_dbg(info->device, "  updated pixclk:     %lu KHz\n",
702                                         PICOS2KHZ(info->var.pixclock));
703         }
704
705
706         /* Initialize control register 2 */
707         value = pdata->default_lcdcon2;
708
709         if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
710                 value |= ATMEL_LCDC_INVLINE_INVERTED;
711         if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
712                 value |= ATMEL_LCDC_INVFRAME_INVERTED;
713
714         switch (info->var.bits_per_pixel) {
715                 case 1: value |= ATMEL_LCDC_PIXELSIZE_1; break;
716                 case 2: value |= ATMEL_LCDC_PIXELSIZE_2; break;
717                 case 4: value |= ATMEL_LCDC_PIXELSIZE_4; break;
718                 case 8: value |= ATMEL_LCDC_PIXELSIZE_8; break;
719                 case 15: /* fall through */
720                 case 16: value |= ATMEL_LCDC_PIXELSIZE_16; break;
721                 case 24: value |= ATMEL_LCDC_PIXELSIZE_24; break;
722                 case 32: value |= ATMEL_LCDC_PIXELSIZE_32; break;
723                 default: BUG(); break;
724         }
725         dev_dbg(info->device, "  * LCDCON2 = %08lx\n", value);
726         lcdc_writel(sinfo, ATMEL_LCDC_LCDCON2, value);
727
728         /* Vertical timing */
729         value = (info->var.vsync_len - 1) << ATMEL_LCDC_VPW_OFFSET;
730         value |= info->var.upper_margin << ATMEL_LCDC_VBP_OFFSET;
731         value |= info->var.lower_margin;
732         dev_dbg(info->device, "  * LCDTIM1 = %08lx\n", value);
733         lcdc_writel(sinfo, ATMEL_LCDC_TIM1, value);
734
735         /* Horizontal timing */
736         value = (info->var.right_margin - 1) << ATMEL_LCDC_HFP_OFFSET;
737         value |= (info->var.hsync_len - 1) << ATMEL_LCDC_HPW_OFFSET;
738         value |= (info->var.left_margin - 1);
739         dev_dbg(info->device, "  * LCDTIM2 = %08lx\n", value);
740         lcdc_writel(sinfo, ATMEL_LCDC_TIM2, value);
741
742         /* Horizontal value (aka line size) */
743         hozval_linesz = compute_hozval(sinfo, info->var.xres);
744
745         /* Display size */
746         value = (hozval_linesz - 1) << ATMEL_LCDC_HOZVAL_OFFSET;
747         value |= info->var.yres - 1;
748         dev_dbg(info->device, "  * LCDFRMCFG = %08lx\n", value);
749         lcdc_writel(sinfo, ATMEL_LCDC_LCDFRMCFG, value);
750
751         /* FIFO Threshold: Use formula from data sheet */
752         value = ATMEL_LCDC_FIFO_SIZE - (2 * ATMEL_LCDC_DMA_BURST_LEN + 3);
753         lcdc_writel(sinfo, ATMEL_LCDC_FIFO, value);
754
755         /* Toggle LCD_MODE every frame */
756         lcdc_writel(sinfo, ATMEL_LCDC_MVAL, 0);
757
758         /* Disable all interrupts */
759         lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
760         /* Enable FIFO & DMA errors */
761         lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
762
763         /* ...wait for DMA engine to become idle... */
764         while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
765                 msleep(10);
766
767         atmel_lcdfb_start(sinfo);
768
769         dev_dbg(info->device, "  * DONE\n");
770
771         return 0;
772 }
773
774 static inline unsigned int chan_to_field(unsigned int chan, const struct fb_bitfield *bf)
775 {
776         chan &= 0xffff;
777         chan >>= 16 - bf->length;
778         return chan << bf->offset;
779 }
780
781 /**
782  *      atmel_lcdfb_setcolreg - Optional function. Sets a color register.
783  *      @regno: Which register in the CLUT we are programming
784  *      @red: The red value which can be up to 16 bits wide
785  *      @green: The green value which can be up to 16 bits wide
786  *      @blue:  The blue value which can be up to 16 bits wide.
787  *      @transp: If supported the alpha value which can be up to 16 bits wide.
788  *      @info: frame buffer info structure
789  *
790  *      Set a single color register. The values supplied have a 16 bit
791  *      magnitude which needs to be scaled in this function for the hardware.
792  *      Things to take into consideration are how many color registers, if
793  *      any, are supported with the current color visual. With truecolor mode
794  *      no color palettes are supported. Here a pseudo palette is created
795  *      which we store the value in pseudo_palette in struct fb_info. For
796  *      pseudocolor mode we have a limited color palette. To deal with this
797  *      we can program what color is displayed for a particular pixel value.
798  *      DirectColor is similar in that we can program each color field. If
799  *      we have a static colormap we don't need to implement this function.
800  *
801  *      Returns negative errno on error, or zero on success. In an
802  *      ideal world, this would have been the case, but as it turns
803  *      out, the other drivers return 1 on failure, so that's what
804  *      we're going to do.
805  */
806 static int atmel_lcdfb_setcolreg(unsigned int regno, unsigned int red,
807                              unsigned int green, unsigned int blue,
808                              unsigned int transp, struct fb_info *info)
809 {
810         struct atmel_lcdfb_info *sinfo = info->par;
811         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
812         unsigned int val;
813         u32 *pal;
814         int ret = 1;
815
816         if (info->var.grayscale)
817                 red = green = blue = (19595 * red + 38470 * green
818                                       + 7471 * blue) >> 16;
819
820         switch (info->fix.visual) {
821         case FB_VISUAL_TRUECOLOR:
822                 if (regno < 16) {
823                         pal = info->pseudo_palette;
824
825                         val  = chan_to_field(red, &info->var.red);
826                         val |= chan_to_field(green, &info->var.green);
827                         val |= chan_to_field(blue, &info->var.blue);
828
829                         pal[regno] = val;
830                         ret = 0;
831                 }
832                 break;
833
834         case FB_VISUAL_PSEUDOCOLOR:
835                 if (regno < 256) {
836                         if (sinfo->config->have_intensity_bit) {
837                                 /* old style I+BGR:555 */
838                                 val  = ((red   >> 11) & 0x001f);
839                                 val |= ((green >>  6) & 0x03e0);
840                                 val |= ((blue  >>  1) & 0x7c00);
841
842                                 /*
843                                  * TODO: intensity bit. Maybe something like
844                                  *   ~(red[10] ^ green[10] ^ blue[10]) & 1
845                                  */
846                         } else {
847                                 /* new style BGR:565 / RGB:565 */
848                                 if (pdata->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
849                                         val  = ((blue >> 11) & 0x001f);
850                                         val |= ((red  >>  0) & 0xf800);
851                                 } else {
852                                         val  = ((red  >> 11) & 0x001f);
853                                         val |= ((blue >>  0) & 0xf800);
854                                 }
855
856                                 val |= ((green >>  5) & 0x07e0);
857                         }
858
859                         lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
860                         ret = 0;
861                 }
862                 break;
863
864         case FB_VISUAL_MONO01:
865                 if (regno < 2) {
866                         val = (regno == 0) ? 0x00 : 0x1F;
867                         lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
868                         ret = 0;
869                 }
870                 break;
871
872         }
873
874         return ret;
875 }
876
877 static int atmel_lcdfb_pan_display(struct fb_var_screeninfo *var,
878                                struct fb_info *info)
879 {
880         dev_dbg(info->device, "%s\n", __func__);
881
882         atmel_lcdfb_update_dma(info, var);
883
884         return 0;
885 }
886
887 static int atmel_lcdfb_blank(int blank_mode, struct fb_info *info)
888 {
889         struct atmel_lcdfb_info *sinfo = info->par;
890
891         switch (blank_mode) {
892         case FB_BLANK_UNBLANK:
893         case FB_BLANK_NORMAL:
894                 atmel_lcdfb_start(sinfo);
895                 break;
896         case FB_BLANK_VSYNC_SUSPEND:
897         case FB_BLANK_HSYNC_SUSPEND:
898                 break;
899         case FB_BLANK_POWERDOWN:
900                 atmel_lcdfb_stop(sinfo);
901                 break;
902         default:
903                 return -EINVAL;
904         }
905
906         /* let fbcon do a soft blank for us */
907         return ((blank_mode == FB_BLANK_NORMAL) ? 1 : 0);
908 }
909
910 static struct fb_ops atmel_lcdfb_ops = {
911         .owner          = THIS_MODULE,
912         .fb_check_var   = atmel_lcdfb_check_var,
913         .fb_set_par     = atmel_lcdfb_set_par,
914         .fb_setcolreg   = atmel_lcdfb_setcolreg,
915         .fb_blank       = atmel_lcdfb_blank,
916         .fb_pan_display = atmel_lcdfb_pan_display,
917         .fb_fillrect    = cfb_fillrect,
918         .fb_copyarea    = cfb_copyarea,
919         .fb_imageblit   = cfb_imageblit,
920 };
921
922 static irqreturn_t atmel_lcdfb_interrupt(int irq, void *dev_id)
923 {
924         struct fb_info *info = dev_id;
925         struct atmel_lcdfb_info *sinfo = info->par;
926         u32 status;
927
928         status = lcdc_readl(sinfo, ATMEL_LCDC_ISR);
929         if (status & ATMEL_LCDC_UFLWI) {
930                 dev_warn(info->device, "FIFO underflow %#x\n", status);
931                 /* reset DMA and FIFO to avoid screen shifting */
932                 schedule_work(&sinfo->task);
933         }
934         lcdc_writel(sinfo, ATMEL_LCDC_ICR, status);
935         return IRQ_HANDLED;
936 }
937
938 /*
939  * LCD controller task (to reset the LCD)
940  */
941 static void atmel_lcdfb_task(struct work_struct *work)
942 {
943         struct atmel_lcdfb_info *sinfo =
944                 container_of(work, struct atmel_lcdfb_info, task);
945
946         atmel_lcdfb_reset(sinfo);
947 }
948
949 static int __init atmel_lcdfb_init_fbinfo(struct atmel_lcdfb_info *sinfo)
950 {
951         struct fb_info *info = sinfo->info;
952         int ret = 0;
953
954         info->var.activate |= FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW;
955
956         dev_info(info->device,
957                "%luKiB frame buffer at %08lx (mapped at %p)\n",
958                (unsigned long)info->fix.smem_len / 1024,
959                (unsigned long)info->fix.smem_start,
960                info->screen_base);
961
962         /* Allocate colormap */
963         ret = fb_alloc_cmap(&info->cmap, 256, 0);
964         if (ret < 0)
965                 dev_err(info->device, "Alloc color map failed\n");
966
967         return ret;
968 }
969
970 static void atmel_lcdfb_start_clock(struct atmel_lcdfb_info *sinfo)
971 {
972         clk_prepare_enable(sinfo->bus_clk);
973         clk_prepare_enable(sinfo->lcdc_clk);
974 }
975
976 static void atmel_lcdfb_stop_clock(struct atmel_lcdfb_info *sinfo)
977 {
978         clk_disable_unprepare(sinfo->bus_clk);
979         clk_disable_unprepare(sinfo->lcdc_clk);
980 }
981
982 #ifdef CONFIG_OF
983 static const struct of_device_id atmel_lcdfb_dt_ids[] = {
984         { .compatible = "atmel,at91sam9261-lcdc" , .data = &at91sam9261_config, },
985         { .compatible = "atmel,at91sam9263-lcdc" , .data = &at91sam9263_config, },
986         { .compatible = "atmel,at91sam9g10-lcdc" , .data = &at91sam9g10_config, },
987         { .compatible = "atmel,at91sam9g45-lcdc" , .data = &at91sam9g45_config, },
988         { .compatible = "atmel,at91sam9g45es-lcdc" , .data = &at91sam9g45es_config, },
989         { .compatible = "atmel,at91sam9rl-lcdc" , .data = &at91sam9rl_config, },
990         { .compatible = "atmel,at32ap-lcdc" , .data = &at32ap_config, },
991         { /* sentinel */ }
992 };
993
994 MODULE_DEVICE_TABLE(of, atmel_lcdfb_dt_ids);
995
996 static const char *atmel_lcdfb_wiring_modes[] = {
997         [ATMEL_LCDC_WIRING_BGR] = "BRG",
998         [ATMEL_LCDC_WIRING_RGB] = "RGB",
999 };
1000
1001 static int atmel_lcdfb_get_of_wiring_modes(struct device_node *np)
1002 {
1003         const char *mode;
1004         int err, i;
1005
1006         err = of_property_read_string(np, "atmel,lcd-wiring-mode", &mode);
1007         if (err < 0)
1008                 return ATMEL_LCDC_WIRING_BGR;
1009
1010         for (i = 0; i < ARRAY_SIZE(atmel_lcdfb_wiring_modes); i++)
1011                 if (!strcasecmp(mode, atmel_lcdfb_wiring_modes[i]))
1012                         return i;
1013
1014         return -ENODEV;
1015 }
1016
1017 static void atmel_lcdfb_power_control_gpio(struct atmel_lcdfb_pdata *pdata, int on)
1018 {
1019         struct atmel_lcdfb_power_ctrl_gpio *og;
1020
1021         list_for_each_entry(og, &pdata->pwr_gpios, list)
1022                 gpio_set_value(og->gpio, on);
1023 }
1024
1025 static int atmel_lcdfb_of_init(struct atmel_lcdfb_info *sinfo)
1026 {
1027         struct fb_info *info = sinfo->info;
1028         struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
1029         struct fb_var_screeninfo *var = &info->var;
1030         struct device *dev = &sinfo->pdev->dev;
1031         struct device_node *np =dev->of_node;
1032         struct device_node *display_np;
1033         struct device_node *timings_np;
1034         struct display_timings *timings;
1035         enum of_gpio_flags flags;
1036         struct atmel_lcdfb_power_ctrl_gpio *og;
1037         bool is_gpio_power = false;
1038         int ret = -ENOENT;
1039         int i, gpio;
1040
1041         sinfo->config = (struct atmel_lcdfb_config*)
1042                 of_match_device(atmel_lcdfb_dt_ids, dev)->data;
1043
1044         display_np = of_parse_phandle(np, "display", 0);
1045         if (!display_np) {
1046                 dev_err(dev, "failed to find display phandle\n");
1047                 return -ENOENT;
1048         }
1049
1050         ret = of_property_read_u32(display_np, "bits-per-pixel", &var->bits_per_pixel);
1051         if (ret < 0) {
1052                 dev_err(dev, "failed to get property bits-per-pixel\n");
1053                 goto put_display_node;
1054         }
1055
1056         ret = of_property_read_u32(display_np, "atmel,guard-time", &pdata->guard_time);
1057         if (ret < 0) {
1058                 dev_err(dev, "failed to get property atmel,guard-time\n");
1059                 goto put_display_node;
1060         }
1061
1062         ret = of_property_read_u32(display_np, "atmel,lcdcon2", &pdata->default_lcdcon2);
1063         if (ret < 0) {
1064                 dev_err(dev, "failed to get property atmel,lcdcon2\n");
1065                 goto put_display_node;
1066         }
1067
1068         ret = of_property_read_u32(display_np, "atmel,dmacon", &pdata->default_dmacon);
1069         if (ret < 0) {
1070                 dev_err(dev, "failed to get property bits-per-pixel\n");
1071                 goto put_display_node;
1072         }
1073
1074         INIT_LIST_HEAD(&pdata->pwr_gpios);
1075         ret = -ENOMEM;
1076         for (i = 0; i < of_gpio_named_count(display_np, "atmel,power-control-gpio"); i++) {
1077                 gpio = of_get_named_gpio_flags(display_np, "atmel,power-control-gpio",
1078                                                i, &flags);
1079                 if (gpio < 0)
1080                         continue;
1081
1082                 og = devm_kzalloc(dev, sizeof(*og), GFP_KERNEL);
1083                 if (!og)
1084                         goto put_display_node;
1085
1086                 og->gpio = gpio;
1087                 og->active_low = flags & OF_GPIO_ACTIVE_LOW;
1088                 is_gpio_power = true;
1089                 ret = devm_gpio_request(dev, gpio, "lcd-power-control-gpio");
1090                 if (ret) {
1091                         dev_err(dev, "request gpio %d failed\n", gpio);
1092                         goto put_display_node;
1093                 }
1094
1095                 ret = gpio_direction_output(gpio, og->active_low);
1096                 if (ret) {
1097                         dev_err(dev, "set direction output gpio %d failed\n", gpio);
1098                         goto put_display_node;
1099                 }
1100                 list_add(&og->list, &pdata->pwr_gpios);
1101         }
1102
1103         if (is_gpio_power)
1104                 pdata->atmel_lcdfb_power_control = atmel_lcdfb_power_control_gpio;
1105
1106         ret = atmel_lcdfb_get_of_wiring_modes(display_np);
1107         if (ret < 0) {
1108                 dev_err(dev, "invalid atmel,lcd-wiring-mode\n");
1109                 goto put_display_node;
1110         }
1111         pdata->lcd_wiring_mode = ret;
1112
1113         pdata->lcdcon_is_backlight = of_property_read_bool(display_np, "atmel,lcdcon-backlight");
1114         pdata->lcdcon_pol_negative = of_property_read_bool(display_np, "atmel,lcdcon-backlight-inverted");
1115
1116         timings = of_get_display_timings(display_np);
1117         if (!timings) {
1118                 dev_err(dev, "failed to get display timings\n");
1119                 ret = -EINVAL;
1120                 goto put_display_node;
1121         }
1122
1123         timings_np = of_find_node_by_name(display_np, "display-timings");
1124         if (!timings_np) {
1125                 dev_err(dev, "failed to find display-timings node\n");
1126                 ret = -ENODEV;
1127                 goto put_display_node;
1128         }
1129
1130         for (i = 0; i < of_get_child_count(timings_np); i++) {
1131                 struct videomode vm;
1132                 struct fb_videomode fb_vm;
1133
1134                 ret = videomode_from_timings(timings, &vm, i);
1135                 if (ret < 0)
1136                         goto put_timings_node;
1137                 ret = fb_videomode_from_videomode(&vm, &fb_vm);
1138                 if (ret < 0)
1139                         goto put_timings_node;
1140
1141                 fb_add_videomode(&fb_vm, &info->modelist);
1142         }
1143
1144         return 0;
1145
1146 put_timings_node:
1147         of_node_put(timings_np);
1148 put_display_node:
1149         of_node_put(display_np);
1150         return ret;
1151 }
1152 #else
1153 static int atmel_lcdfb_of_init(struct atmel_lcdfb_info *sinfo)
1154 {
1155         return 0;
1156 }
1157 #endif
1158
1159 static int __init atmel_lcdfb_probe(struct platform_device *pdev)
1160 {
1161         struct device *dev = &pdev->dev;
1162         struct fb_info *info;
1163         struct atmel_lcdfb_info *sinfo;
1164         struct atmel_lcdfb_pdata *pdata = NULL;
1165         struct resource *regs = NULL;
1166         struct resource *map = NULL;
1167         struct fb_modelist *modelist;
1168         int ret;
1169
1170         dev_dbg(dev, "%s BEGIN\n", __func__);
1171
1172         ret = -ENOMEM;
1173         info = framebuffer_alloc(sizeof(struct atmel_lcdfb_info), dev);
1174         if (!info) {
1175                 dev_err(dev, "cannot allocate memory\n");
1176                 goto out;
1177         }
1178
1179         sinfo = info->par;
1180         sinfo->pdev = pdev;
1181         sinfo->info = info;
1182
1183         INIT_LIST_HEAD(&info->modelist);
1184
1185         if (pdev->dev.of_node) {
1186                 ret = atmel_lcdfb_of_init(sinfo);
1187                 if (ret)
1188                         goto free_info;
1189         } else if (dev_get_platdata(dev)) {
1190                 struct fb_monspecs *monspecs;
1191                 int i;
1192
1193                 pdata = dev_get_platdata(dev);
1194                 monspecs = pdata->default_monspecs;
1195                 sinfo->pdata = *pdata;
1196
1197                 for (i = 0; i < monspecs->modedb_len; i++)
1198                         fb_add_videomode(&monspecs->modedb[i], &info->modelist);
1199
1200                 sinfo->config = atmel_lcdfb_get_config(pdev);
1201
1202                 info->var.bits_per_pixel = pdata->default_bpp ? pdata->default_bpp : 16;
1203                 memcpy(&info->monspecs, pdata->default_monspecs, sizeof(info->monspecs));
1204         } else {
1205                 dev_err(dev, "cannot get default configuration\n");
1206                 goto free_info;
1207         }
1208
1209         if (!sinfo->config)
1210                 goto free_info;
1211
1212         sinfo->reg_lcd = devm_regulator_get(&pdev->dev, "lcd");
1213         if (IS_ERR(sinfo->reg_lcd))
1214                 sinfo->reg_lcd = NULL;
1215
1216         info->flags = ATMEL_LCDFB_FBINFO_DEFAULT;
1217         info->pseudo_palette = sinfo->pseudo_palette;
1218         info->fbops = &atmel_lcdfb_ops;
1219
1220         info->fix = atmel_lcdfb_fix;
1221         strcpy(info->fix.id, sinfo->pdev->name);
1222
1223         /* Enable LCDC Clocks */
1224         sinfo->bus_clk = clk_get(dev, "hclk");
1225         if (IS_ERR(sinfo->bus_clk)) {
1226                 ret = PTR_ERR(sinfo->bus_clk);
1227                 goto free_info;
1228         }
1229         sinfo->lcdc_clk = clk_get(dev, "lcdc_clk");
1230         if (IS_ERR(sinfo->lcdc_clk)) {
1231                 ret = PTR_ERR(sinfo->lcdc_clk);
1232                 goto put_bus_clk;
1233         }
1234         atmel_lcdfb_start_clock(sinfo);
1235
1236         modelist = list_first_entry(&info->modelist,
1237                         struct fb_modelist, list);
1238         fb_videomode_to_var(&info->var, &modelist->mode);
1239
1240         atmel_lcdfb_check_var(&info->var, info);
1241
1242         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1243         if (!regs) {
1244                 dev_err(dev, "resources unusable\n");
1245                 ret = -ENXIO;
1246                 goto stop_clk;
1247         }
1248
1249         sinfo->irq_base = platform_get_irq(pdev, 0);
1250         if (sinfo->irq_base < 0) {
1251                 dev_err(dev, "unable to get irq\n");
1252                 ret = sinfo->irq_base;
1253                 goto stop_clk;
1254         }
1255
1256         /* Initialize video memory */
1257         map = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1258         if (map) {
1259                 /* use a pre-allocated memory buffer */
1260                 info->fix.smem_start = map->start;
1261                 info->fix.smem_len = resource_size(map);
1262                 if (!request_mem_region(info->fix.smem_start,
1263                                         info->fix.smem_len, pdev->name)) {
1264                         ret = -EBUSY;
1265                         goto stop_clk;
1266                 }
1267
1268                 info->screen_base = ioremap_wc(info->fix.smem_start,
1269                                                info->fix.smem_len);
1270                 if (!info->screen_base) {
1271                         ret = -ENOMEM;
1272                         goto release_intmem;
1273                 }
1274
1275                 /*
1276                  * Don't clear the framebuffer -- someone may have set
1277                  * up a splash image.
1278                  */
1279         } else {
1280                 /* allocate memory buffer */
1281                 ret = atmel_lcdfb_alloc_video_memory(sinfo);
1282                 if (ret < 0) {
1283                         dev_err(dev, "cannot allocate framebuffer: %d\n", ret);
1284                         goto stop_clk;
1285                 }
1286         }
1287
1288         /* LCDC registers */
1289         info->fix.mmio_start = regs->start;
1290         info->fix.mmio_len = resource_size(regs);
1291
1292         if (!request_mem_region(info->fix.mmio_start,
1293                                 info->fix.mmio_len, pdev->name)) {
1294                 ret = -EBUSY;
1295                 goto free_fb;
1296         }
1297
1298         sinfo->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len);
1299         if (!sinfo->mmio) {
1300                 dev_err(dev, "cannot map LCDC registers\n");
1301                 ret = -ENOMEM;
1302                 goto release_mem;
1303         }
1304
1305         /* Initialize PWM for contrast or backlight ("off") */
1306         init_contrast(sinfo);
1307
1308         /* interrupt */
1309         ret = request_irq(sinfo->irq_base, atmel_lcdfb_interrupt, 0, pdev->name, info);
1310         if (ret) {
1311                 dev_err(dev, "request_irq failed: %d\n", ret);
1312                 goto unmap_mmio;
1313         }
1314
1315         /* Some operations on the LCDC might sleep and
1316          * require a preemptible task context */
1317         INIT_WORK(&sinfo->task, atmel_lcdfb_task);
1318
1319         ret = atmel_lcdfb_init_fbinfo(sinfo);
1320         if (ret < 0) {
1321                 dev_err(dev, "init fbinfo failed: %d\n", ret);
1322                 goto unregister_irqs;
1323         }
1324
1325         ret = atmel_lcdfb_set_par(info);
1326         if (ret < 0) {
1327                 dev_err(dev, "set par failed: %d\n", ret);
1328                 goto unregister_irqs;
1329         }
1330
1331         dev_set_drvdata(dev, info);
1332
1333         /*
1334          * Tell the world that we're ready to go
1335          */
1336         ret = register_framebuffer(info);
1337         if (ret < 0) {
1338                 dev_err(dev, "failed to register framebuffer device: %d\n", ret);
1339                 goto reset_drvdata;
1340         }
1341
1342         /* Power up the LCDC screen */
1343         atmel_lcdfb_power_control(sinfo, 1);
1344
1345         dev_info(dev, "fb%d: Atmel LCDC at 0x%08lx (mapped at %p), irq %d\n",
1346                        info->node, info->fix.mmio_start, sinfo->mmio, sinfo->irq_base);
1347
1348         return 0;
1349
1350 reset_drvdata:
1351         dev_set_drvdata(dev, NULL);
1352         fb_dealloc_cmap(&info->cmap);
1353 unregister_irqs:
1354         cancel_work_sync(&sinfo->task);
1355         free_irq(sinfo->irq_base, info);
1356 unmap_mmio:
1357         exit_backlight(sinfo);
1358         iounmap(sinfo->mmio);
1359 release_mem:
1360         release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1361 free_fb:
1362         if (map)
1363                 iounmap(info->screen_base);
1364         else
1365                 atmel_lcdfb_free_video_memory(sinfo);
1366
1367 release_intmem:
1368         if (map)
1369                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1370 stop_clk:
1371         atmel_lcdfb_stop_clock(sinfo);
1372         clk_put(sinfo->lcdc_clk);
1373 put_bus_clk:
1374         clk_put(sinfo->bus_clk);
1375 free_info:
1376         framebuffer_release(info);
1377 out:
1378         dev_dbg(dev, "%s FAILED\n", __func__);
1379         return ret;
1380 }
1381
1382 static int __exit atmel_lcdfb_remove(struct platform_device *pdev)
1383 {
1384         struct device *dev = &pdev->dev;
1385         struct fb_info *info = dev_get_drvdata(dev);
1386         struct atmel_lcdfb_info *sinfo;
1387         struct atmel_lcdfb_pdata *pdata;
1388
1389         if (!info || !info->par)
1390                 return 0;
1391         sinfo = info->par;
1392         pdata = &sinfo->pdata;
1393
1394         cancel_work_sync(&sinfo->task);
1395         exit_backlight(sinfo);
1396         atmel_lcdfb_power_control(sinfo, 0);
1397         unregister_framebuffer(info);
1398         atmel_lcdfb_stop_clock(sinfo);
1399         clk_put(sinfo->lcdc_clk);
1400         clk_put(sinfo->bus_clk);
1401         fb_dealloc_cmap(&info->cmap);
1402         free_irq(sinfo->irq_base, info);
1403         iounmap(sinfo->mmio);
1404         release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1405         if (platform_get_resource(pdev, IORESOURCE_MEM, 1)) {
1406                 iounmap(info->screen_base);
1407                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1408         } else {
1409                 atmel_lcdfb_free_video_memory(sinfo);
1410         }
1411
1412         framebuffer_release(info);
1413
1414         return 0;
1415 }
1416
1417 #ifdef CONFIG_PM
1418
1419 static int atmel_lcdfb_suspend(struct platform_device *pdev, pm_message_t mesg)
1420 {
1421         struct fb_info *info = platform_get_drvdata(pdev);
1422         struct atmel_lcdfb_info *sinfo = info->par;
1423
1424         /*
1425          * We don't want to handle interrupts while the clock is
1426          * stopped. It may take forever.
1427          */
1428         lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
1429
1430         sinfo->saved_lcdcon = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_CTR);
1431         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, 0);
1432         atmel_lcdfb_power_control(sinfo, 0);
1433         atmel_lcdfb_stop(sinfo);
1434         atmel_lcdfb_stop_clock(sinfo);
1435
1436         return 0;
1437 }
1438
1439 static int atmel_lcdfb_resume(struct platform_device *pdev)
1440 {
1441         struct fb_info *info = platform_get_drvdata(pdev);
1442         struct atmel_lcdfb_info *sinfo = info->par;
1443
1444         atmel_lcdfb_start_clock(sinfo);
1445         atmel_lcdfb_start(sinfo);
1446         atmel_lcdfb_power_control(sinfo, 1);
1447         lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, sinfo->saved_lcdcon);
1448
1449         /* Enable FIFO & DMA errors */
1450         lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI
1451                         | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
1452
1453         return 0;
1454 }
1455
1456 #else
1457 #define atmel_lcdfb_suspend     NULL
1458 #define atmel_lcdfb_resume      NULL
1459 #endif
1460
1461 static struct platform_driver atmel_lcdfb_driver = {
1462         .remove         = __exit_p(atmel_lcdfb_remove),
1463         .suspend        = atmel_lcdfb_suspend,
1464         .resume         = atmel_lcdfb_resume,
1465         .id_table       = atmel_lcdfb_devtypes,
1466         .driver         = {
1467                 .name   = "atmel_lcdfb",
1468                 .of_match_table = of_match_ptr(atmel_lcdfb_dt_ids),
1469         },
1470 };
1471
1472 module_platform_driver_probe(atmel_lcdfb_driver, atmel_lcdfb_probe);
1473
1474 MODULE_DESCRIPTION("AT91/AT32 LCD Controller framebuffer driver");
1475 MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
1476 MODULE_LICENSE("GPL");