Merge branch 'common/fbdev' of master.kernel.org:/pub/scm/linux/kernel/git/lethal...
[sfrench/cifs-2.6.git] / drivers / video / sh_mobile_lcdcfb.c
1 /*
2  * SuperH Mobile LCDC Framebuffer
3  *
4  * Copyright (c) 2008 Magnus Damm
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
8  * for more details.
9  */
10
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/delay.h>
14 #include <linux/mm.h>
15 #include <linux/clk.h>
16 #include <linux/pm_runtime.h>
17 #include <linux/platform_device.h>
18 #include <linux/dma-mapping.h>
19 #include <linux/interrupt.h>
20 #include <linux/vmalloc.h>
21 #include <linux/ioctl.h>
22 #include <linux/slab.h>
23 #include <linux/console.h>
24 #include <linux/backlight.h>
25 #include <linux/gpio.h>
26 #include <video/sh_mobile_lcdc.h>
27 #include <asm/atomic.h>
28
29 #include "sh_mobile_lcdcfb.h"
30
31 #define SIDE_B_OFFSET 0x1000
32 #define MIRROR_OFFSET 0x2000
33
34 /* shared registers */
35 #define _LDDCKR 0x410
36 #define _LDDCKSTPR 0x414
37 #define _LDINTR 0x468
38 #define _LDSR 0x46c
39 #define _LDCNT1R 0x470
40 #define _LDCNT2R 0x474
41 #define _LDRCNTR 0x478
42 #define _LDDDSR 0x47c
43 #define _LDDWD0R 0x800
44 #define _LDDRDR 0x840
45 #define _LDDWAR 0x900
46 #define _LDDRAR 0x904
47
48 /* shared registers and their order for context save/restore */
49 static int lcdc_shared_regs[] = {
50         _LDDCKR,
51         _LDDCKSTPR,
52         _LDINTR,
53         _LDDDSR,
54         _LDCNT1R,
55         _LDCNT2R,
56 };
57 #define NR_SHARED_REGS ARRAY_SIZE(lcdc_shared_regs)
58
59 #define MAX_XRES 1920
60 #define MAX_YRES 1080
61
62 static unsigned long lcdc_offs_mainlcd[NR_CH_REGS] = {
63         [LDDCKPAT1R] = 0x400,
64         [LDDCKPAT2R] = 0x404,
65         [LDMT1R] = 0x418,
66         [LDMT2R] = 0x41c,
67         [LDMT3R] = 0x420,
68         [LDDFR] = 0x424,
69         [LDSM1R] = 0x428,
70         [LDSM2R] = 0x42c,
71         [LDSA1R] = 0x430,
72         [LDSA2R] = 0x434,
73         [LDMLSR] = 0x438,
74         [LDHCNR] = 0x448,
75         [LDHSYNR] = 0x44c,
76         [LDVLNR] = 0x450,
77         [LDVSYNR] = 0x454,
78         [LDPMR] = 0x460,
79         [LDHAJR] = 0x4a0,
80 };
81
82 static unsigned long lcdc_offs_sublcd[NR_CH_REGS] = {
83         [LDDCKPAT1R] = 0x408,
84         [LDDCKPAT2R] = 0x40c,
85         [LDMT1R] = 0x600,
86         [LDMT2R] = 0x604,
87         [LDMT3R] = 0x608,
88         [LDDFR] = 0x60c,
89         [LDSM1R] = 0x610,
90         [LDSM2R] = 0x614,
91         [LDSA1R] = 0x618,
92         [LDMLSR] = 0x620,
93         [LDHCNR] = 0x624,
94         [LDHSYNR] = 0x628,
95         [LDVLNR] = 0x62c,
96         [LDVSYNR] = 0x630,
97         [LDPMR] = 0x63c,
98 };
99
100 #define START_LCDC      0x00000001
101 #define LCDC_RESET      0x00000100
102 #define DISPLAY_BEU     0x00000008
103 #define LCDC_ENABLE     0x00000001
104 #define LDINTR_FE       0x00000400
105 #define LDINTR_VSE      0x00000200
106 #define LDINTR_VEE      0x00000100
107 #define LDINTR_FS       0x00000004
108 #define LDINTR_VSS      0x00000002
109 #define LDINTR_VES      0x00000001
110 #define LDRCNTR_SRS     0x00020000
111 #define LDRCNTR_SRC     0x00010000
112 #define LDRCNTR_MRS     0x00000002
113 #define LDRCNTR_MRC     0x00000001
114 #define LDSR_MRS        0x00000100
115
116 static const struct fb_videomode default_720p = {
117         .name = "HDMI 720p",
118         .xres = 1280,
119         .yres = 720,
120
121         .left_margin = 220,
122         .right_margin = 110,
123         .hsync_len = 40,
124
125         .upper_margin = 20,
126         .lower_margin = 5,
127         .vsync_len = 5,
128
129         .pixclock = 13468,
130         .refresh = 60,
131         .sync = FB_SYNC_VERT_HIGH_ACT | FB_SYNC_HOR_HIGH_ACT,
132 };
133
134 struct sh_mobile_lcdc_priv {
135         void __iomem *base;
136         int irq;
137         atomic_t hw_usecnt;
138         struct device *dev;
139         struct clk *dot_clk;
140         unsigned long lddckr;
141         struct sh_mobile_lcdc_chan ch[2];
142         struct notifier_block notifier;
143         unsigned long saved_shared_regs[NR_SHARED_REGS];
144         int started;
145         int forced_bpp; /* 2 channel LCDC must share bpp setting */
146 };
147
148 static bool banked(int reg_nr)
149 {
150         switch (reg_nr) {
151         case LDMT1R:
152         case LDMT2R:
153         case LDMT3R:
154         case LDDFR:
155         case LDSM1R:
156         case LDSA1R:
157         case LDSA2R:
158         case LDMLSR:
159         case LDHCNR:
160         case LDHSYNR:
161         case LDVLNR:
162         case LDVSYNR:
163                 return true;
164         }
165         return false;
166 }
167
168 static void lcdc_write_chan(struct sh_mobile_lcdc_chan *chan,
169                             int reg_nr, unsigned long data)
170 {
171         iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr]);
172         if (banked(reg_nr))
173                 iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr] +
174                           SIDE_B_OFFSET);
175 }
176
177 static void lcdc_write_chan_mirror(struct sh_mobile_lcdc_chan *chan,
178                             int reg_nr, unsigned long data)
179 {
180         iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr] +
181                   MIRROR_OFFSET);
182 }
183
184 static unsigned long lcdc_read_chan(struct sh_mobile_lcdc_chan *chan,
185                                     int reg_nr)
186 {
187         return ioread32(chan->lcdc->base + chan->reg_offs[reg_nr]);
188 }
189
190 static void lcdc_write(struct sh_mobile_lcdc_priv *priv,
191                        unsigned long reg_offs, unsigned long data)
192 {
193         iowrite32(data, priv->base + reg_offs);
194 }
195
196 static unsigned long lcdc_read(struct sh_mobile_lcdc_priv *priv,
197                                unsigned long reg_offs)
198 {
199         return ioread32(priv->base + reg_offs);
200 }
201
202 static void lcdc_wait_bit(struct sh_mobile_lcdc_priv *priv,
203                           unsigned long reg_offs,
204                           unsigned long mask, unsigned long until)
205 {
206         while ((lcdc_read(priv, reg_offs) & mask) != until)
207                 cpu_relax();
208 }
209
210 static int lcdc_chan_is_sublcd(struct sh_mobile_lcdc_chan *chan)
211 {
212         return chan->cfg.chan == LCDC_CHAN_SUBLCD;
213 }
214
215 static void lcdc_sys_write_index(void *handle, unsigned long data)
216 {
217         struct sh_mobile_lcdc_chan *ch = handle;
218
219         lcdc_write(ch->lcdc, _LDDWD0R, data | 0x10000000);
220         lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
221         lcdc_write(ch->lcdc, _LDDWAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0));
222         lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
223 }
224
225 static void lcdc_sys_write_data(void *handle, unsigned long data)
226 {
227         struct sh_mobile_lcdc_chan *ch = handle;
228
229         lcdc_write(ch->lcdc, _LDDWD0R, data | 0x11000000);
230         lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
231         lcdc_write(ch->lcdc, _LDDWAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0));
232         lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
233 }
234
235 static unsigned long lcdc_sys_read_data(void *handle)
236 {
237         struct sh_mobile_lcdc_chan *ch = handle;
238
239         lcdc_write(ch->lcdc, _LDDRDR, 0x01000000);
240         lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
241         lcdc_write(ch->lcdc, _LDDRAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0));
242         udelay(1);
243         lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
244
245         return lcdc_read(ch->lcdc, _LDDRDR) & 0x3ffff;
246 }
247
248 struct sh_mobile_lcdc_sys_bus_ops sh_mobile_lcdc_sys_bus_ops = {
249         lcdc_sys_write_index,
250         lcdc_sys_write_data,
251         lcdc_sys_read_data,
252 };
253
254 static void sh_mobile_lcdc_clk_on(struct sh_mobile_lcdc_priv *priv)
255 {
256         if (atomic_inc_and_test(&priv->hw_usecnt)) {
257                 pm_runtime_get_sync(priv->dev);
258                 if (priv->dot_clk)
259                         clk_enable(priv->dot_clk);
260         }
261 }
262
263 static void sh_mobile_lcdc_clk_off(struct sh_mobile_lcdc_priv *priv)
264 {
265         if (atomic_sub_return(1, &priv->hw_usecnt) == -1) {
266                 if (priv->dot_clk)
267                         clk_disable(priv->dot_clk);
268                 pm_runtime_put(priv->dev);
269         }
270 }
271
272 static int sh_mobile_lcdc_sginit(struct fb_info *info,
273                                   struct list_head *pagelist)
274 {
275         struct sh_mobile_lcdc_chan *ch = info->par;
276         unsigned int nr_pages_max = info->fix.smem_len >> PAGE_SHIFT;
277         struct page *page;
278         int nr_pages = 0;
279
280         sg_init_table(ch->sglist, nr_pages_max);
281
282         list_for_each_entry(page, pagelist, lru)
283                 sg_set_page(&ch->sglist[nr_pages++], page, PAGE_SIZE, 0);
284
285         return nr_pages;
286 }
287
288 static void sh_mobile_lcdc_deferred_io(struct fb_info *info,
289                                        struct list_head *pagelist)
290 {
291         struct sh_mobile_lcdc_chan *ch = info->par;
292         struct sh_mobile_lcdc_board_cfg *bcfg = &ch->cfg.board_cfg;
293
294         /* enable clocks before accessing hardware */
295         sh_mobile_lcdc_clk_on(ch->lcdc);
296
297         /*
298          * It's possible to get here without anything on the pagelist via
299          * sh_mobile_lcdc_deferred_io_touch() or via a userspace fsync()
300          * invocation. In the former case, the acceleration routines are
301          * stepped in to when using the framebuffer console causing the
302          * workqueue to be scheduled without any dirty pages on the list.
303          *
304          * Despite this, a panel update is still needed given that the
305          * acceleration routines have their own methods for writing in
306          * that still need to be updated.
307          *
308          * The fsync() and empty pagelist case could be optimized for,
309          * but we don't bother, as any application exhibiting such
310          * behaviour is fundamentally broken anyways.
311          */
312         if (!list_empty(pagelist)) {
313                 unsigned int nr_pages = sh_mobile_lcdc_sginit(info, pagelist);
314
315                 /* trigger panel update */
316                 dma_map_sg(info->dev, ch->sglist, nr_pages, DMA_TO_DEVICE);
317                 if (bcfg->start_transfer)
318                         bcfg->start_transfer(bcfg->board_data, ch,
319                                              &sh_mobile_lcdc_sys_bus_ops);
320                 lcdc_write_chan(ch, LDSM2R, 1);
321                 dma_unmap_sg(info->dev, ch->sglist, nr_pages, DMA_TO_DEVICE);
322         } else {
323                 if (bcfg->start_transfer)
324                         bcfg->start_transfer(bcfg->board_data, ch,
325                                              &sh_mobile_lcdc_sys_bus_ops);
326                 lcdc_write_chan(ch, LDSM2R, 1);
327         }
328 }
329
330 static void sh_mobile_lcdc_deferred_io_touch(struct fb_info *info)
331 {
332         struct fb_deferred_io *fbdefio = info->fbdefio;
333
334         if (fbdefio)
335                 schedule_delayed_work(&info->deferred_work, fbdefio->delay);
336 }
337
338 static irqreturn_t sh_mobile_lcdc_irq(int irq, void *data)
339 {
340         struct sh_mobile_lcdc_priv *priv = data;
341         struct sh_mobile_lcdc_chan *ch;
342         unsigned long tmp;
343         unsigned long ldintr;
344         int is_sub;
345         int k;
346
347         /* acknowledge interrupt */
348         ldintr = tmp = lcdc_read(priv, _LDINTR);
349         /*
350          * disable further VSYNC End IRQs, preserve all other enabled IRQs,
351          * write 0 to bits 0-6 to ack all triggered IRQs.
352          */
353         tmp &= 0xffffff00 & ~LDINTR_VEE;
354         lcdc_write(priv, _LDINTR, tmp);
355
356         /* figure out if this interrupt is for main or sub lcd */
357         is_sub = (lcdc_read(priv, _LDSR) & (1 << 10)) ? 1 : 0;
358
359         /* wake up channel and disable clocks */
360         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
361                 ch = &priv->ch[k];
362
363                 if (!ch->enabled)
364                         continue;
365
366                 /* Frame Start */
367                 if (ldintr & LDINTR_FS) {
368                         if (is_sub == lcdc_chan_is_sublcd(ch)) {
369                                 ch->frame_end = 1;
370                                 wake_up(&ch->frame_end_wait);
371
372                                 sh_mobile_lcdc_clk_off(priv);
373                         }
374                 }
375
376                 /* VSYNC End */
377                 if (ldintr & LDINTR_VES)
378                         complete(&ch->vsync_completion);
379         }
380
381         return IRQ_HANDLED;
382 }
383
384 static void sh_mobile_lcdc_start_stop(struct sh_mobile_lcdc_priv *priv,
385                                       int start)
386 {
387         unsigned long tmp = lcdc_read(priv, _LDCNT2R);
388         int k;
389
390         /* start or stop the lcdc */
391         if (start)
392                 lcdc_write(priv, _LDCNT2R, tmp | START_LCDC);
393         else
394                 lcdc_write(priv, _LDCNT2R, tmp & ~START_LCDC);
395
396         /* wait until power is applied/stopped on all channels */
397         for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
398                 if (lcdc_read(priv, _LDCNT2R) & priv->ch[k].enabled)
399                         while (1) {
400                                 tmp = lcdc_read_chan(&priv->ch[k], LDPMR) & 3;
401                                 if (start && tmp == 3)
402                                         break;
403                                 if (!start && tmp == 0)
404                                         break;
405                                 cpu_relax();
406                         }
407
408         if (!start)
409                 lcdc_write(priv, _LDDCKSTPR, 1); /* stop dotclock */
410 }
411
412 static void sh_mobile_lcdc_geometry(struct sh_mobile_lcdc_chan *ch)
413 {
414         struct fb_var_screeninfo *var = &ch->info->var, *display_var = &ch->display_var;
415         unsigned long h_total, hsync_pos, display_h_total;
416         u32 tmp;
417
418         tmp = ch->ldmt1r_value;
419         tmp |= (var->sync & FB_SYNC_VERT_HIGH_ACT) ? 0 : 1 << 28;
420         tmp |= (var->sync & FB_SYNC_HOR_HIGH_ACT) ? 0 : 1 << 27;
421         tmp |= (ch->cfg.flags & LCDC_FLAGS_DWPOL) ? 1 << 26 : 0;
422         tmp |= (ch->cfg.flags & LCDC_FLAGS_DIPOL) ? 1 << 25 : 0;
423         tmp |= (ch->cfg.flags & LCDC_FLAGS_DAPOL) ? 1 << 24 : 0;
424         tmp |= (ch->cfg.flags & LCDC_FLAGS_HSCNT) ? 1 << 17 : 0;
425         tmp |= (ch->cfg.flags & LCDC_FLAGS_DWCNT) ? 1 << 16 : 0;
426         lcdc_write_chan(ch, LDMT1R, tmp);
427
428         /* setup SYS bus */
429         lcdc_write_chan(ch, LDMT2R, ch->cfg.sys_bus_cfg.ldmt2r);
430         lcdc_write_chan(ch, LDMT3R, ch->cfg.sys_bus_cfg.ldmt3r);
431
432         /* horizontal configuration */
433         h_total = display_var->xres + display_var->hsync_len +
434                 display_var->left_margin + display_var->right_margin;
435         tmp = h_total / 8; /* HTCN */
436         tmp |= (min(display_var->xres, var->xres) / 8) << 16; /* HDCN */
437         lcdc_write_chan(ch, LDHCNR, tmp);
438
439         hsync_pos = display_var->xres + display_var->right_margin;
440         tmp = hsync_pos / 8; /* HSYNP */
441         tmp |= (display_var->hsync_len / 8) << 16; /* HSYNW */
442         lcdc_write_chan(ch, LDHSYNR, tmp);
443
444         /* vertical configuration */
445         tmp = display_var->yres + display_var->vsync_len +
446                 display_var->upper_margin + display_var->lower_margin; /* VTLN */
447         tmp |= min(display_var->yres, var->yres) << 16; /* VDLN */
448         lcdc_write_chan(ch, LDVLNR, tmp);
449
450         tmp = display_var->yres + display_var->lower_margin; /* VSYNP */
451         tmp |= display_var->vsync_len << 16; /* VSYNW */
452         lcdc_write_chan(ch, LDVSYNR, tmp);
453
454         /* Adjust horizontal synchronisation for HDMI */
455         display_h_total = display_var->xres + display_var->hsync_len +
456                 display_var->left_margin + display_var->right_margin;
457         tmp = ((display_var->xres & 7) << 24) |
458                 ((display_h_total & 7) << 16) |
459                 ((display_var->hsync_len & 7) << 8) |
460                 hsync_pos;
461         lcdc_write_chan(ch, LDHAJR, tmp);
462 }
463
464 static int sh_mobile_lcdc_start(struct sh_mobile_lcdc_priv *priv)
465 {
466         struct sh_mobile_lcdc_chan *ch;
467         struct sh_mobile_lcdc_board_cfg *board_cfg;
468         unsigned long tmp;
469         int bpp = 0;
470         unsigned long ldddsr;
471         int k, m;
472         int ret = 0;
473
474         /* enable clocks before accessing the hardware */
475         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
476                 if (priv->ch[k].enabled) {
477                         sh_mobile_lcdc_clk_on(priv);
478                         if (!bpp)
479                                 bpp = priv->ch[k].info->var.bits_per_pixel;
480                 }
481         }
482
483         /* reset */
484         lcdc_write(priv, _LDCNT2R, lcdc_read(priv, _LDCNT2R) | LCDC_RESET);
485         lcdc_wait_bit(priv, _LDCNT2R, LCDC_RESET, 0);
486
487         /* enable LCDC channels */
488         tmp = lcdc_read(priv, _LDCNT2R);
489         tmp |= priv->ch[0].enabled;
490         tmp |= priv->ch[1].enabled;
491         lcdc_write(priv, _LDCNT2R, tmp);
492
493         /* read data from external memory, avoid using the BEU for now */
494         lcdc_write(priv, _LDCNT2R, lcdc_read(priv, _LDCNT2R) & ~DISPLAY_BEU);
495
496         /* stop the lcdc first */
497         sh_mobile_lcdc_start_stop(priv, 0);
498
499         /* configure clocks */
500         tmp = priv->lddckr;
501         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
502                 ch = &priv->ch[k];
503
504                 if (!priv->ch[k].enabled)
505                         continue;
506
507                 m = ch->cfg.clock_divider;
508                 if (!m)
509                         continue;
510
511                 if (m == 1)
512                         m = 1 << 6;
513                 tmp |= m << (lcdc_chan_is_sublcd(ch) ? 8 : 0);
514
515                 /* FIXME: sh7724 can only use 42, 48, 54 and 60 for the divider denominator */
516                 lcdc_write_chan(ch, LDDCKPAT1R, 0);
517                 lcdc_write_chan(ch, LDDCKPAT2R, (1 << (m/2)) - 1);
518         }
519
520         lcdc_write(priv, _LDDCKR, tmp);
521
522         /* start dotclock again */
523         lcdc_write(priv, _LDDCKSTPR, 0);
524         lcdc_wait_bit(priv, _LDDCKSTPR, ~0, 0);
525
526         /* interrupts are disabled to begin with */
527         lcdc_write(priv, _LDINTR, 0);
528
529         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
530                 ch = &priv->ch[k];
531
532                 if (!ch->enabled)
533                         continue;
534
535                 sh_mobile_lcdc_geometry(ch);
536
537                 /* power supply */
538                 lcdc_write_chan(ch, LDPMR, 0);
539
540                 board_cfg = &ch->cfg.board_cfg;
541                 if (board_cfg->setup_sys)
542                         ret = board_cfg->setup_sys(board_cfg->board_data, ch,
543                                                    &sh_mobile_lcdc_sys_bus_ops);
544                 if (ret)
545                         return ret;
546         }
547
548         /* word and long word swap */
549         ldddsr = lcdc_read(priv, _LDDDSR);
550         if  (priv->ch[0].info->var.nonstd)
551                 lcdc_write(priv, _LDDDSR, ldddsr | 7);
552         else {
553                 switch (bpp) {
554                 case 16:
555                         lcdc_write(priv, _LDDDSR, ldddsr | 6);
556                         break;
557                 case 24:
558                         lcdc_write(priv, _LDDDSR, ldddsr | 7);
559                         break;
560                 case 32:
561                         lcdc_write(priv, _LDDDSR, ldddsr | 4);
562                         break;
563                 }
564         }
565
566         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
567                 ch = &priv->ch[k];
568
569                 if (!priv->ch[k].enabled)
570                         continue;
571
572                 /* set bpp format in PKF[4:0] */
573                 tmp = lcdc_read_chan(ch, LDDFR);
574                 tmp &= ~0x0003031f;
575                 if (ch->info->var.nonstd) {
576                         tmp |= (ch->info->var.nonstd << 16);
577                         switch (ch->info->var.bits_per_pixel) {
578                         case 12:
579                                 break;
580                         case 16:
581                                 tmp |= (0x1 << 8);
582                                 break;
583                         case 24:
584                                 tmp |= (0x2 << 8);
585                                 break;
586                         }
587                 } else {
588                         switch (ch->info->var.bits_per_pixel) {
589                         case 16:
590                                 tmp |= 0x03;
591                                 break;
592                         case 24:
593                                 tmp |= 0x0b;
594                                 break;
595                         case 32:
596                                 break;
597                         }
598                 }
599                 lcdc_write_chan(ch, LDDFR, tmp);
600
601                 /* point out our frame buffer */
602                 lcdc_write_chan(ch, LDSA1R, ch->info->fix.smem_start);
603                 if (ch->info->var.nonstd)
604                         lcdc_write_chan(ch, LDSA2R,
605                                 ch->info->fix.smem_start +
606                                 ch->info->var.xres *
607                                 ch->info->var.yres_virtual);
608
609                 /* set line size */
610                 lcdc_write_chan(ch, LDMLSR, ch->info->fix.line_length);
611
612                 /* setup deferred io if SYS bus */
613                 tmp = ch->cfg.sys_bus_cfg.deferred_io_msec;
614                 if (ch->ldmt1r_value & (1 << 12) && tmp) {
615                         ch->defio.deferred_io = sh_mobile_lcdc_deferred_io;
616                         ch->defio.delay = msecs_to_jiffies(tmp);
617                         ch->info->fbdefio = &ch->defio;
618                         fb_deferred_io_init(ch->info);
619
620                         /* one-shot mode */
621                         lcdc_write_chan(ch, LDSM1R, 1);
622
623                         /* enable "Frame End Interrupt Enable" bit */
624                         lcdc_write(priv, _LDINTR, LDINTR_FE);
625
626                 } else {
627                         /* continuous read mode */
628                         lcdc_write_chan(ch, LDSM1R, 0);
629                 }
630         }
631
632         /* display output */
633         lcdc_write(priv, _LDCNT1R, LCDC_ENABLE);
634
635         /* start the lcdc */
636         sh_mobile_lcdc_start_stop(priv, 1);
637         priv->started = 1;
638
639         /* tell the board code to enable the panel */
640         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
641                 ch = &priv->ch[k];
642                 if (!ch->enabled)
643                         continue;
644
645                 board_cfg = &ch->cfg.board_cfg;
646                 if (board_cfg->display_on && try_module_get(board_cfg->owner)) {
647                         board_cfg->display_on(board_cfg->board_data, ch->info);
648                         module_put(board_cfg->owner);
649                 }
650
651                 if (ch->bl) {
652                         ch->bl->props.power = FB_BLANK_UNBLANK;
653                         backlight_update_status(ch->bl);
654                 }
655         }
656
657         return 0;
658 }
659
660 static void sh_mobile_lcdc_stop(struct sh_mobile_lcdc_priv *priv)
661 {
662         struct sh_mobile_lcdc_chan *ch;
663         struct sh_mobile_lcdc_board_cfg *board_cfg;
664         int k;
665
666         /* clean up deferred io and ask board code to disable panel */
667         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
668                 ch = &priv->ch[k];
669                 if (!ch->enabled)
670                         continue;
671
672                 /* deferred io mode:
673                  * flush frame, and wait for frame end interrupt
674                  * clean up deferred io and enable clock
675                  */
676                 if (ch->info && ch->info->fbdefio) {
677                         ch->frame_end = 0;
678                         schedule_delayed_work(&ch->info->deferred_work, 0);
679                         wait_event(ch->frame_end_wait, ch->frame_end);
680                         fb_deferred_io_cleanup(ch->info);
681                         ch->info->fbdefio = NULL;
682                         sh_mobile_lcdc_clk_on(priv);
683                 }
684
685                 if (ch->bl) {
686                         ch->bl->props.power = FB_BLANK_POWERDOWN;
687                         backlight_update_status(ch->bl);
688                 }
689
690                 board_cfg = &ch->cfg.board_cfg;
691                 if (board_cfg->display_off && try_module_get(board_cfg->owner)) {
692                         board_cfg->display_off(board_cfg->board_data);
693                         module_put(board_cfg->owner);
694                 }
695         }
696
697         /* stop the lcdc */
698         if (priv->started) {
699                 sh_mobile_lcdc_start_stop(priv, 0);
700                 priv->started = 0;
701         }
702
703         /* stop clocks */
704         for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
705                 if (priv->ch[k].enabled)
706                         sh_mobile_lcdc_clk_off(priv);
707 }
708
709 static int sh_mobile_lcdc_check_interface(struct sh_mobile_lcdc_chan *ch)
710 {
711         int ifm, miftyp;
712
713         switch (ch->cfg.interface_type) {
714         case RGB8: ifm = 0; miftyp = 0; break;
715         case RGB9: ifm = 0; miftyp = 4; break;
716         case RGB12A: ifm = 0; miftyp = 5; break;
717         case RGB12B: ifm = 0; miftyp = 6; break;
718         case RGB16: ifm = 0; miftyp = 7; break;
719         case RGB18: ifm = 0; miftyp = 10; break;
720         case RGB24: ifm = 0; miftyp = 11; break;
721         case SYS8A: ifm = 1; miftyp = 0; break;
722         case SYS8B: ifm = 1; miftyp = 1; break;
723         case SYS8C: ifm = 1; miftyp = 2; break;
724         case SYS8D: ifm = 1; miftyp = 3; break;
725         case SYS9: ifm = 1; miftyp = 4; break;
726         case SYS12: ifm = 1; miftyp = 5; break;
727         case SYS16A: ifm = 1; miftyp = 7; break;
728         case SYS16B: ifm = 1; miftyp = 8; break;
729         case SYS16C: ifm = 1; miftyp = 9; break;
730         case SYS18: ifm = 1; miftyp = 10; break;
731         case SYS24: ifm = 1; miftyp = 11; break;
732         default: goto bad;
733         }
734
735         /* SUBLCD only supports SYS interface */
736         if (lcdc_chan_is_sublcd(ch)) {
737                 if (ifm == 0)
738                         goto bad;
739                 else
740                         ifm = 0;
741         }
742
743         ch->ldmt1r_value = (ifm << 12) | miftyp;
744         return 0;
745  bad:
746         return -EINVAL;
747 }
748
749 static int sh_mobile_lcdc_setup_clocks(struct platform_device *pdev,
750                                        int clock_source,
751                                        struct sh_mobile_lcdc_priv *priv)
752 {
753         char *str;
754         int icksel;
755
756         switch (clock_source) {
757         case LCDC_CLK_BUS: str = "bus_clk"; icksel = 0; break;
758         case LCDC_CLK_PERIPHERAL: str = "peripheral_clk"; icksel = 1; break;
759         case LCDC_CLK_EXTERNAL: str = NULL; icksel = 2; break;
760         default:
761                 return -EINVAL;
762         }
763
764         priv->lddckr = icksel << 16;
765
766         if (str) {
767                 priv->dot_clk = clk_get(&pdev->dev, str);
768                 if (IS_ERR(priv->dot_clk)) {
769                         dev_err(&pdev->dev, "cannot get dot clock %s\n", str);
770                         return PTR_ERR(priv->dot_clk);
771                 }
772         }
773
774         /* Runtime PM support involves two step for this driver:
775          * 1) Enable Runtime PM
776          * 2) Force Runtime PM Resume since hardware is accessed from probe()
777          */
778         priv->dev = &pdev->dev;
779         pm_runtime_enable(priv->dev);
780         pm_runtime_resume(priv->dev);
781         return 0;
782 }
783
784 static int sh_mobile_lcdc_setcolreg(u_int regno,
785                                     u_int red, u_int green, u_int blue,
786                                     u_int transp, struct fb_info *info)
787 {
788         u32 *palette = info->pseudo_palette;
789
790         if (regno >= PALETTE_NR)
791                 return -EINVAL;
792
793         /* only FB_VISUAL_TRUECOLOR supported */
794
795         red >>= 16 - info->var.red.length;
796         green >>= 16 - info->var.green.length;
797         blue >>= 16 - info->var.blue.length;
798         transp >>= 16 - info->var.transp.length;
799
800         palette[regno] = (red << info->var.red.offset) |
801           (green << info->var.green.offset) |
802           (blue << info->var.blue.offset) |
803           (transp << info->var.transp.offset);
804
805         return 0;
806 }
807
808 static struct fb_fix_screeninfo sh_mobile_lcdc_fix  = {
809         .id =           "SH Mobile LCDC",
810         .type =         FB_TYPE_PACKED_PIXELS,
811         .visual =       FB_VISUAL_TRUECOLOR,
812         .accel =        FB_ACCEL_NONE,
813         .xpanstep =     0,
814         .ypanstep =     1,
815         .ywrapstep =    0,
816 };
817
818 static void sh_mobile_lcdc_fillrect(struct fb_info *info,
819                                     const struct fb_fillrect *rect)
820 {
821         sys_fillrect(info, rect);
822         sh_mobile_lcdc_deferred_io_touch(info);
823 }
824
825 static void sh_mobile_lcdc_copyarea(struct fb_info *info,
826                                     const struct fb_copyarea *area)
827 {
828         sys_copyarea(info, area);
829         sh_mobile_lcdc_deferred_io_touch(info);
830 }
831
832 static void sh_mobile_lcdc_imageblit(struct fb_info *info,
833                                      const struct fb_image *image)
834 {
835         sys_imageblit(info, image);
836         sh_mobile_lcdc_deferred_io_touch(info);
837 }
838
839 static int sh_mobile_fb_pan_display(struct fb_var_screeninfo *var,
840                                      struct fb_info *info)
841 {
842         struct sh_mobile_lcdc_chan *ch = info->par;
843         struct sh_mobile_lcdc_priv *priv = ch->lcdc;
844         unsigned long ldrcntr;
845         unsigned long new_pan_offset;
846         unsigned long base_addr_y, base_addr_c;
847         unsigned long c_offset;
848
849         if (!var->nonstd)
850                 new_pan_offset = (var->yoffset * info->fix.line_length) +
851                         (var->xoffset * (info->var.bits_per_pixel / 8));
852         else
853                 new_pan_offset = (var->yoffset * info->fix.line_length) +
854                         (var->xoffset);
855
856         if (new_pan_offset == ch->pan_offset)
857                 return 0;       /* No change, do nothing */
858
859         ldrcntr = lcdc_read(priv, _LDRCNTR);
860
861         /* Set the source address for the next refresh */
862         base_addr_y = ch->dma_handle + new_pan_offset;
863         if (var->nonstd) {
864                 /* Set y offset */
865                 c_offset = (var->yoffset *
866                         info->fix.line_length *
867                         (info->var.bits_per_pixel - 8)) / 8;
868                 base_addr_c = ch->dma_handle + var->xres * var->yres_virtual +
869                         c_offset;
870                 /* Set x offset */
871                 if (info->var.bits_per_pixel == 24)
872                         base_addr_c += 2 * var->xoffset;
873                 else
874                         base_addr_c += var->xoffset;
875         } else
876                 base_addr_c = 0;
877
878         lcdc_write_chan_mirror(ch, LDSA1R, base_addr_y);
879         if (base_addr_c)
880                 lcdc_write_chan_mirror(ch, LDSA2R, base_addr_c);
881
882         if (lcdc_chan_is_sublcd(ch))
883                 lcdc_write(ch->lcdc, _LDRCNTR, ldrcntr ^ LDRCNTR_SRS);
884         else
885                 lcdc_write(ch->lcdc, _LDRCNTR, ldrcntr ^ LDRCNTR_MRS);
886
887         ch->pan_offset = new_pan_offset;
888
889         sh_mobile_lcdc_deferred_io_touch(info);
890
891         return 0;
892 }
893
894 static int sh_mobile_wait_for_vsync(struct fb_info *info)
895 {
896         struct sh_mobile_lcdc_chan *ch = info->par;
897         unsigned long ldintr;
898         int ret;
899
900         /* Enable VSync End interrupt */
901         ldintr = lcdc_read(ch->lcdc, _LDINTR);
902         ldintr |= LDINTR_VEE;
903         lcdc_write(ch->lcdc, _LDINTR, ldintr);
904
905         ret = wait_for_completion_interruptible_timeout(&ch->vsync_completion,
906                                                         msecs_to_jiffies(100));
907         if (!ret)
908                 return -ETIMEDOUT;
909
910         return 0;
911 }
912
913 static int sh_mobile_ioctl(struct fb_info *info, unsigned int cmd,
914                        unsigned long arg)
915 {
916         int retval;
917
918         switch (cmd) {
919         case FBIO_WAITFORVSYNC:
920                 retval = sh_mobile_wait_for_vsync(info);
921                 break;
922
923         default:
924                 retval = -ENOIOCTLCMD;
925                 break;
926         }
927         return retval;
928 }
929
930 static void sh_mobile_fb_reconfig(struct fb_info *info)
931 {
932         struct sh_mobile_lcdc_chan *ch = info->par;
933         struct fb_videomode mode1, mode2;
934         struct fb_event event;
935         int evnt = FB_EVENT_MODE_CHANGE_ALL;
936
937         if (ch->use_count > 1 || (ch->use_count == 1 && !info->fbcon_par))
938                 /* More framebuffer users are active */
939                 return;
940
941         fb_var_to_videomode(&mode1, &ch->display_var);
942         fb_var_to_videomode(&mode2, &info->var);
943
944         if (fb_mode_is_equal(&mode1, &mode2))
945                 return;
946
947         /* Display has been re-plugged, framebuffer is free now, reconfigure */
948         if (fb_set_var(info, &ch->display_var) < 0)
949                 /* Couldn't reconfigure, hopefully, can continue as before */
950                 return;
951
952         if (info->var.nonstd)
953                 info->fix.line_length = mode1.xres;
954         else
955                 info->fix.line_length = mode1.xres * (ch->cfg.bpp / 8);
956
957         /*
958          * fb_set_var() calls the notifier change internally, only if
959          * FBINFO_MISC_USEREVENT flag is set. Since we do not want to fake a
960          * user event, we have to call the chain ourselves.
961          */
962         event.info = info;
963         event.data = &mode1;
964         fb_notifier_call_chain(evnt, &event);
965 }
966
967 /*
968  * Locking: both .fb_release() and .fb_open() are called with info->lock held if
969  * user == 1, or with console sem held, if user == 0.
970  */
971 static int sh_mobile_release(struct fb_info *info, int user)
972 {
973         struct sh_mobile_lcdc_chan *ch = info->par;
974
975         mutex_lock(&ch->open_lock);
976         dev_dbg(info->dev, "%s(): %d users\n", __func__, ch->use_count);
977
978         ch->use_count--;
979
980         /* Nothing to reconfigure, when called from fbcon */
981         if (user) {
982                 console_lock();
983                 sh_mobile_fb_reconfig(info);
984                 console_unlock();
985         }
986
987         mutex_unlock(&ch->open_lock);
988
989         return 0;
990 }
991
992 static int sh_mobile_open(struct fb_info *info, int user)
993 {
994         struct sh_mobile_lcdc_chan *ch = info->par;
995
996         mutex_lock(&ch->open_lock);
997         ch->use_count++;
998
999         dev_dbg(info->dev, "%s(): %d users\n", __func__, ch->use_count);
1000         mutex_unlock(&ch->open_lock);
1001
1002         return 0;
1003 }
1004
1005 static int sh_mobile_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
1006 {
1007         struct sh_mobile_lcdc_chan *ch = info->par;
1008         struct sh_mobile_lcdc_priv *p = ch->lcdc;
1009
1010         if (var->xres > MAX_XRES || var->yres > MAX_YRES ||
1011             var->xres * var->yres * (ch->cfg.bpp / 8) * 2 > info->fix.smem_len) {
1012                 dev_warn(info->dev, "Invalid info: %u-%u-%u-%u x %u-%u-%u-%u @ %lukHz!\n",
1013                          var->left_margin, var->xres, var->right_margin, var->hsync_len,
1014                          var->upper_margin, var->yres, var->lower_margin, var->vsync_len,
1015                          PICOS2KHZ(var->pixclock));
1016                 return -EINVAL;
1017         }
1018
1019         /* only accept the forced_bpp for dual channel configurations */
1020         if (p->forced_bpp && p->forced_bpp != var->bits_per_pixel)
1021                 return -EINVAL;
1022
1023         switch (var->bits_per_pixel) {
1024         case 16: /* PKF[4:0] = 00011 - RGB 565 */
1025         case 24: /* PKF[4:0] = 01011 - RGB 888 */
1026         case 32: /* PKF[4:0] = 00000 - RGBA 888 */
1027                 break;
1028         default:
1029                 return -EINVAL;
1030         }
1031
1032         return 0;
1033 }
1034
1035 /*
1036  * Screen blanking. Behavior is as follows:
1037  * FB_BLANK_UNBLANK: screen unblanked, clocks enabled
1038  * FB_BLANK_NORMAL: screen blanked, clocks enabled
1039  * FB_BLANK_VSYNC,
1040  * FB_BLANK_HSYNC,
1041  * FB_BLANK_POWEROFF: screen blanked, clocks disabled
1042  */
1043 static int sh_mobile_lcdc_blank(int blank, struct fb_info *info)
1044 {
1045         struct sh_mobile_lcdc_chan *ch = info->par;
1046         struct sh_mobile_lcdc_priv *p = ch->lcdc;
1047
1048         /* blank the screen? */
1049         if (blank > FB_BLANK_UNBLANK && ch->blank_status == FB_BLANK_UNBLANK) {
1050                 struct fb_fillrect rect = {
1051                         .width = info->var.xres,
1052                         .height = info->var.yres,
1053                 };
1054                 sh_mobile_lcdc_fillrect(info, &rect);
1055         }
1056         /* turn clocks on? */
1057         if (blank <= FB_BLANK_NORMAL && ch->blank_status > FB_BLANK_NORMAL) {
1058                 sh_mobile_lcdc_clk_on(p);
1059         }
1060         /* turn clocks off? */
1061         if (blank > FB_BLANK_NORMAL && ch->blank_status <= FB_BLANK_NORMAL) {
1062                 /* make sure the screen is updated with the black fill before
1063                  * switching the clocks off. one vsync is not enough since
1064                  * blanking may occur in the middle of a refresh. deferred io
1065                  * mode will reenable the clocks and update the screen in time,
1066                  * so it does not need this. */
1067                 if (!info->fbdefio) {
1068                         sh_mobile_wait_for_vsync(info);
1069                         sh_mobile_wait_for_vsync(info);
1070                 }
1071                 sh_mobile_lcdc_clk_off(p);
1072         }
1073
1074         ch->blank_status = blank;
1075         return 0;
1076 }
1077
1078 static struct fb_ops sh_mobile_lcdc_ops = {
1079         .owner          = THIS_MODULE,
1080         .fb_setcolreg   = sh_mobile_lcdc_setcolreg,
1081         .fb_read        = fb_sys_read,
1082         .fb_write       = fb_sys_write,
1083         .fb_fillrect    = sh_mobile_lcdc_fillrect,
1084         .fb_copyarea    = sh_mobile_lcdc_copyarea,
1085         .fb_imageblit   = sh_mobile_lcdc_imageblit,
1086         .fb_blank       = sh_mobile_lcdc_blank,
1087         .fb_pan_display = sh_mobile_fb_pan_display,
1088         .fb_ioctl       = sh_mobile_ioctl,
1089         .fb_open        = sh_mobile_open,
1090         .fb_release     = sh_mobile_release,
1091         .fb_check_var   = sh_mobile_check_var,
1092 };
1093
1094 static int sh_mobile_lcdc_update_bl(struct backlight_device *bdev)
1095 {
1096         struct sh_mobile_lcdc_chan *ch = bl_get_data(bdev);
1097         struct sh_mobile_lcdc_board_cfg *cfg = &ch->cfg.board_cfg;
1098         int brightness = bdev->props.brightness;
1099
1100         if (bdev->props.power != FB_BLANK_UNBLANK ||
1101             bdev->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
1102                 brightness = 0;
1103
1104         return cfg->set_brightness(cfg->board_data, brightness);
1105 }
1106
1107 static int sh_mobile_lcdc_get_brightness(struct backlight_device *bdev)
1108 {
1109         struct sh_mobile_lcdc_chan *ch = bl_get_data(bdev);
1110         struct sh_mobile_lcdc_board_cfg *cfg = &ch->cfg.board_cfg;
1111
1112         return cfg->get_brightness(cfg->board_data);
1113 }
1114
1115 static int sh_mobile_lcdc_check_fb(struct backlight_device *bdev,
1116                                    struct fb_info *info)
1117 {
1118         return (info->bl_dev == bdev);
1119 }
1120
1121 static struct backlight_ops sh_mobile_lcdc_bl_ops = {
1122         .options        = BL_CORE_SUSPENDRESUME,
1123         .update_status  = sh_mobile_lcdc_update_bl,
1124         .get_brightness = sh_mobile_lcdc_get_brightness,
1125         .check_fb       = sh_mobile_lcdc_check_fb,
1126 };
1127
1128 static struct backlight_device *sh_mobile_lcdc_bl_probe(struct device *parent,
1129                                                struct sh_mobile_lcdc_chan *ch)
1130 {
1131         struct backlight_device *bl;
1132
1133         bl = backlight_device_register(ch->cfg.bl_info.name, parent, ch,
1134                                        &sh_mobile_lcdc_bl_ops, NULL);
1135         if (IS_ERR(bl)) {
1136                 dev_err(parent, "unable to register backlight device: %ld\n",
1137                         PTR_ERR(bl));
1138                 return NULL;
1139         }
1140
1141         bl->props.max_brightness = ch->cfg.bl_info.max_brightness;
1142         bl->props.brightness = bl->props.max_brightness;
1143         backlight_update_status(bl);
1144
1145         return bl;
1146 }
1147
1148 static void sh_mobile_lcdc_bl_remove(struct backlight_device *bdev)
1149 {
1150         backlight_device_unregister(bdev);
1151 }
1152
1153 static int sh_mobile_lcdc_set_bpp(struct fb_var_screeninfo *var, int bpp,
1154                                    int nonstd)
1155 {
1156         if (nonstd) {
1157                 switch (bpp) {
1158                 case 12:
1159                 case 16:
1160                 case 24:
1161                         var->bits_per_pixel = bpp;
1162                         var->nonstd = nonstd;
1163                         return 0;
1164                 default:
1165                         return -EINVAL;
1166                 }
1167         }
1168
1169         switch (bpp) {
1170         case 16: /* PKF[4:0] = 00011 - RGB 565 */
1171                 var->red.offset = 11;
1172                 var->red.length = 5;
1173                 var->green.offset = 5;
1174                 var->green.length = 6;
1175                 var->blue.offset = 0;
1176                 var->blue.length = 5;
1177                 var->transp.offset = 0;
1178                 var->transp.length = 0;
1179                 break;
1180
1181         case 24: /* PKF[4:0] = 01011 - RGB 888 */
1182                 var->red.offset = 16;
1183                 var->red.length = 8;
1184                 var->green.offset = 8;
1185                 var->green.length = 8;
1186                 var->blue.offset = 0;
1187                 var->blue.length = 8;
1188                 var->transp.offset = 0;
1189                 var->transp.length = 0;
1190                 break;
1191
1192         case 32: /* PKF[4:0] = 00000 - RGBA 888 */
1193                 var->red.offset = 16;
1194                 var->red.length = 8;
1195                 var->green.offset = 8;
1196                 var->green.length = 8;
1197                 var->blue.offset = 0;
1198                 var->blue.length = 8;
1199                 var->transp.offset = 24;
1200                 var->transp.length = 8;
1201                 break;
1202         default:
1203                 return -EINVAL;
1204         }
1205         var->bits_per_pixel = bpp;
1206         var->red.msb_right = 0;
1207         var->green.msb_right = 0;
1208         var->blue.msb_right = 0;
1209         var->transp.msb_right = 0;
1210         return 0;
1211 }
1212
1213 static int sh_mobile_lcdc_suspend(struct device *dev)
1214 {
1215         struct platform_device *pdev = to_platform_device(dev);
1216
1217         sh_mobile_lcdc_stop(platform_get_drvdata(pdev));
1218         return 0;
1219 }
1220
1221 static int sh_mobile_lcdc_resume(struct device *dev)
1222 {
1223         struct platform_device *pdev = to_platform_device(dev);
1224
1225         return sh_mobile_lcdc_start(platform_get_drvdata(pdev));
1226 }
1227
1228 static int sh_mobile_lcdc_runtime_suspend(struct device *dev)
1229 {
1230         struct platform_device *pdev = to_platform_device(dev);
1231         struct sh_mobile_lcdc_priv *p = platform_get_drvdata(pdev);
1232         struct sh_mobile_lcdc_chan *ch;
1233         int k, n;
1234
1235         /* save per-channel registers */
1236         for (k = 0; k < ARRAY_SIZE(p->ch); k++) {
1237                 ch = &p->ch[k];
1238                 if (!ch->enabled)
1239                         continue;
1240                 for (n = 0; n < NR_CH_REGS; n++)
1241                         ch->saved_ch_regs[n] = lcdc_read_chan(ch, n);
1242         }
1243
1244         /* save shared registers */
1245         for (n = 0; n < NR_SHARED_REGS; n++)
1246                 p->saved_shared_regs[n] = lcdc_read(p, lcdc_shared_regs[n]);
1247
1248         /* turn off LCDC hardware */
1249         lcdc_write(p, _LDCNT1R, 0);
1250         return 0;
1251 }
1252
1253 static int sh_mobile_lcdc_runtime_resume(struct device *dev)
1254 {
1255         struct platform_device *pdev = to_platform_device(dev);
1256         struct sh_mobile_lcdc_priv *p = platform_get_drvdata(pdev);
1257         struct sh_mobile_lcdc_chan *ch;
1258         int k, n;
1259
1260         /* restore per-channel registers */
1261         for (k = 0; k < ARRAY_SIZE(p->ch); k++) {
1262                 ch = &p->ch[k];
1263                 if (!ch->enabled)
1264                         continue;
1265                 for (n = 0; n < NR_CH_REGS; n++)
1266                         lcdc_write_chan(ch, n, ch->saved_ch_regs[n]);
1267         }
1268
1269         /* restore shared registers */
1270         for (n = 0; n < NR_SHARED_REGS; n++)
1271                 lcdc_write(p, lcdc_shared_regs[n], p->saved_shared_regs[n]);
1272
1273         return 0;
1274 }
1275
1276 static const struct dev_pm_ops sh_mobile_lcdc_dev_pm_ops = {
1277         .suspend = sh_mobile_lcdc_suspend,
1278         .resume = sh_mobile_lcdc_resume,
1279         .runtime_suspend = sh_mobile_lcdc_runtime_suspend,
1280         .runtime_resume = sh_mobile_lcdc_runtime_resume,
1281 };
1282
1283 /* locking: called with info->lock held */
1284 static int sh_mobile_lcdc_notify(struct notifier_block *nb,
1285                                  unsigned long action, void *data)
1286 {
1287         struct fb_event *event = data;
1288         struct fb_info *info = event->info;
1289         struct sh_mobile_lcdc_chan *ch = info->par;
1290         struct sh_mobile_lcdc_board_cfg *board_cfg = &ch->cfg.board_cfg;
1291         int ret;
1292
1293         if (&ch->lcdc->notifier != nb)
1294                 return NOTIFY_DONE;
1295
1296         dev_dbg(info->dev, "%s(): action = %lu, data = %p\n",
1297                 __func__, action, event->data);
1298
1299         switch(action) {
1300         case FB_EVENT_SUSPEND:
1301                 if (board_cfg->display_off && try_module_get(board_cfg->owner)) {
1302                         board_cfg->display_off(board_cfg->board_data);
1303                         module_put(board_cfg->owner);
1304                 }
1305                 pm_runtime_put(info->device);
1306                 sh_mobile_lcdc_stop(ch->lcdc);
1307                 break;
1308         case FB_EVENT_RESUME:
1309                 mutex_lock(&ch->open_lock);
1310                 sh_mobile_fb_reconfig(info);
1311                 mutex_unlock(&ch->open_lock);
1312
1313                 /* HDMI must be enabled before LCDC configuration */
1314                 if (board_cfg->display_on && try_module_get(board_cfg->owner)) {
1315                         board_cfg->display_on(board_cfg->board_data, info);
1316                         module_put(board_cfg->owner);
1317                 }
1318
1319                 ret = sh_mobile_lcdc_start(ch->lcdc);
1320                 if (!ret)
1321                         pm_runtime_get_sync(info->device);
1322         }
1323
1324         return NOTIFY_OK;
1325 }
1326
1327 static int sh_mobile_lcdc_remove(struct platform_device *pdev);
1328
1329 static int __devinit sh_mobile_lcdc_probe(struct platform_device *pdev)
1330 {
1331         struct fb_info *info;
1332         struct sh_mobile_lcdc_priv *priv;
1333         struct sh_mobile_lcdc_info *pdata = pdev->dev.platform_data;
1334         struct resource *res;
1335         int error;
1336         void *buf;
1337         int i, j;
1338
1339         if (!pdata) {
1340                 dev_err(&pdev->dev, "no platform data defined\n");
1341                 return -EINVAL;
1342         }
1343
1344         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1345         i = platform_get_irq(pdev, 0);
1346         if (!res || i < 0) {
1347                 dev_err(&pdev->dev, "cannot get platform resources\n");
1348                 return -ENOENT;
1349         }
1350
1351         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1352         if (!priv) {
1353                 dev_err(&pdev->dev, "cannot allocate device data\n");
1354                 return -ENOMEM;
1355         }
1356
1357         platform_set_drvdata(pdev, priv);
1358
1359         error = request_irq(i, sh_mobile_lcdc_irq, IRQF_DISABLED,
1360                             dev_name(&pdev->dev), priv);
1361         if (error) {
1362                 dev_err(&pdev->dev, "unable to request irq\n");
1363                 goto err1;
1364         }
1365
1366         priv->irq = i;
1367         atomic_set(&priv->hw_usecnt, -1);
1368
1369         j = 0;
1370         for (i = 0; i < ARRAY_SIZE(pdata->ch); i++) {
1371                 struct sh_mobile_lcdc_chan *ch = priv->ch + j;
1372
1373                 ch->lcdc = priv;
1374                 memcpy(&ch->cfg, &pdata->ch[i], sizeof(pdata->ch[i]));
1375
1376                 error = sh_mobile_lcdc_check_interface(ch);
1377                 if (error) {
1378                         dev_err(&pdev->dev, "unsupported interface type\n");
1379                         goto err1;
1380                 }
1381                 init_waitqueue_head(&ch->frame_end_wait);
1382                 init_completion(&ch->vsync_completion);
1383                 ch->pan_offset = 0;
1384
1385                 /* probe the backlight is there is one defined */
1386                 if (ch->cfg.bl_info.max_brightness)
1387                         ch->bl = sh_mobile_lcdc_bl_probe(&pdev->dev, ch);
1388
1389                 switch (pdata->ch[i].chan) {
1390                 case LCDC_CHAN_MAINLCD:
1391                         ch->enabled = 1 << 1;
1392                         ch->reg_offs = lcdc_offs_mainlcd;
1393                         j++;
1394                         break;
1395                 case LCDC_CHAN_SUBLCD:
1396                         ch->enabled = 1 << 2;
1397                         ch->reg_offs = lcdc_offs_sublcd;
1398                         j++;
1399                         break;
1400                 }
1401         }
1402
1403         if (!j) {
1404                 dev_err(&pdev->dev, "no channels defined\n");
1405                 error = -EINVAL;
1406                 goto err1;
1407         }
1408
1409         /* for dual channel LCDC (MAIN + SUB) force shared bpp setting */
1410         if (j == 2)
1411                 priv->forced_bpp = pdata->ch[0].bpp;
1412
1413         priv->base = ioremap_nocache(res->start, resource_size(res));
1414         if (!priv->base)
1415                 goto err1;
1416
1417         error = sh_mobile_lcdc_setup_clocks(pdev, pdata->clock_source, priv);
1418         if (error) {
1419                 dev_err(&pdev->dev, "unable to setup clocks\n");
1420                 goto err1;
1421         }
1422
1423         for (i = 0; i < j; i++) {
1424                 struct fb_var_screeninfo *var;
1425                 const struct fb_videomode *lcd_cfg, *max_cfg = NULL;
1426                 struct sh_mobile_lcdc_chan *ch = priv->ch + i;
1427                 struct sh_mobile_lcdc_chan_cfg *cfg = &ch->cfg;
1428                 const struct fb_videomode *mode = cfg->lcd_cfg;
1429                 unsigned long max_size = 0;
1430                 int k;
1431                 int num_cfg;
1432
1433                 ch->info = framebuffer_alloc(0, &pdev->dev);
1434                 if (!ch->info) {
1435                         dev_err(&pdev->dev, "unable to allocate fb_info\n");
1436                         error = -ENOMEM;
1437                         break;
1438                 }
1439
1440                 info = ch->info;
1441                 var = &info->var;
1442                 info->fbops = &sh_mobile_lcdc_ops;
1443                 info->par = ch;
1444
1445                 mutex_init(&ch->open_lock);
1446
1447                 for (k = 0, lcd_cfg = mode;
1448                      k < cfg->num_cfg && lcd_cfg;
1449                      k++, lcd_cfg++) {
1450                         unsigned long size = lcd_cfg->yres * lcd_cfg->xres;
1451                         /* NV12 buffers must have even number of lines */
1452                         if ((cfg->nonstd) && cfg->bpp == 12 &&
1453                                         (lcd_cfg->yres & 0x1)) {
1454                                 dev_err(&pdev->dev, "yres must be multiple of 2"
1455                                                 " for YCbCr420 mode.\n");
1456                                 error = -EINVAL;
1457                                 goto err1;
1458                         }
1459
1460                         if (size > max_size) {
1461                                 max_cfg = lcd_cfg;
1462                                 max_size = size;
1463                         }
1464                 }
1465
1466                 if (!mode)
1467                         max_size = MAX_XRES * MAX_YRES;
1468                 else if (max_cfg)
1469                         dev_dbg(&pdev->dev, "Found largest videomode %ux%u\n",
1470                                 max_cfg->xres, max_cfg->yres);
1471
1472                 info->fix = sh_mobile_lcdc_fix;
1473                 info->fix.smem_len = max_size * 2 * cfg->bpp / 8;
1474
1475                  /* Only pan in 2 line steps for NV12 */
1476                 if (cfg->nonstd && cfg->bpp == 12)
1477                         info->fix.ypanstep = 2;
1478
1479                 if (!mode) {
1480                         mode = &default_720p;
1481                         num_cfg = 1;
1482                 } else {
1483                         num_cfg = cfg->num_cfg;
1484                 }
1485
1486                 fb_videomode_to_modelist(mode, num_cfg, &info->modelist);
1487
1488                 fb_videomode_to_var(var, mode);
1489                 var->width = cfg->lcd_size_cfg.width;
1490                 var->height = cfg->lcd_size_cfg.height;
1491                 /* Default Y virtual resolution is 2x panel size */
1492                 var->yres_virtual = var->yres * 2;
1493                 var->activate = FB_ACTIVATE_NOW;
1494
1495                 error = sh_mobile_lcdc_set_bpp(var, cfg->bpp, cfg->nonstd);
1496                 if (error)
1497                         break;
1498
1499                 buf = dma_alloc_coherent(&pdev->dev, info->fix.smem_len,
1500                                          &ch->dma_handle, GFP_KERNEL);
1501                 if (!buf) {
1502                         dev_err(&pdev->dev, "unable to allocate buffer\n");
1503                         error = -ENOMEM;
1504                         break;
1505                 }
1506
1507                 info->pseudo_palette = &ch->pseudo_palette;
1508                 info->flags = FBINFO_FLAG_DEFAULT;
1509
1510                 error = fb_alloc_cmap(&info->cmap, PALETTE_NR, 0);
1511                 if (error < 0) {
1512                         dev_err(&pdev->dev, "unable to allocate cmap\n");
1513                         dma_free_coherent(&pdev->dev, info->fix.smem_len,
1514                                           buf, ch->dma_handle);
1515                         break;
1516                 }
1517
1518                 info->fix.smem_start = ch->dma_handle;
1519                 if (var->nonstd)
1520                         info->fix.line_length = var->xres;
1521                 else
1522                         info->fix.line_length = var->xres * (cfg->bpp / 8);
1523
1524                 info->screen_base = buf;
1525                 info->device = &pdev->dev;
1526                 ch->display_var = *var;
1527         }
1528
1529         if (error)
1530                 goto err1;
1531
1532         error = sh_mobile_lcdc_start(priv);
1533         if (error) {
1534                 dev_err(&pdev->dev, "unable to start hardware\n");
1535                 goto err1;
1536         }
1537
1538         for (i = 0; i < j; i++) {
1539                 struct sh_mobile_lcdc_chan *ch = priv->ch + i;
1540
1541                 info = ch->info;
1542
1543                 if (info->fbdefio) {
1544                         ch->sglist = vmalloc(sizeof(struct scatterlist) *
1545                                         info->fix.smem_len >> PAGE_SHIFT);
1546                         if (!ch->sglist) {
1547                                 dev_err(&pdev->dev, "cannot allocate sglist\n");
1548                                 goto err1;
1549                         }
1550                 }
1551
1552                 info->bl_dev = ch->bl;
1553
1554                 error = register_framebuffer(info);
1555                 if (error < 0)
1556                         goto err1;
1557
1558                 dev_info(info->dev,
1559                          "registered %s/%s as %dx%d %dbpp.\n",
1560                          pdev->name,
1561                          (ch->cfg.chan == LCDC_CHAN_MAINLCD) ?
1562                          "mainlcd" : "sublcd",
1563                          info->var.xres, info->var.yres,
1564                          ch->cfg.bpp);
1565
1566                 /* deferred io mode: disable clock to save power */
1567                 if (info->fbdefio || info->state == FBINFO_STATE_SUSPENDED)
1568                         sh_mobile_lcdc_clk_off(priv);
1569         }
1570
1571         /* Failure ignored */
1572         priv->notifier.notifier_call = sh_mobile_lcdc_notify;
1573         fb_register_client(&priv->notifier);
1574
1575         return 0;
1576 err1:
1577         sh_mobile_lcdc_remove(pdev);
1578
1579         return error;
1580 }
1581
1582 static int sh_mobile_lcdc_remove(struct platform_device *pdev)
1583 {
1584         struct sh_mobile_lcdc_priv *priv = platform_get_drvdata(pdev);
1585         struct fb_info *info;
1586         int i;
1587
1588         fb_unregister_client(&priv->notifier);
1589
1590         for (i = 0; i < ARRAY_SIZE(priv->ch); i++)
1591                 if (priv->ch[i].info && priv->ch[i].info->dev)
1592                         unregister_framebuffer(priv->ch[i].info);
1593
1594         sh_mobile_lcdc_stop(priv);
1595
1596         for (i = 0; i < ARRAY_SIZE(priv->ch); i++) {
1597                 info = priv->ch[i].info;
1598
1599                 if (!info || !info->device)
1600                         continue;
1601
1602                 if (priv->ch[i].sglist)
1603                         vfree(priv->ch[i].sglist);
1604
1605                 if (info->screen_base)
1606                         dma_free_coherent(&pdev->dev, info->fix.smem_len,
1607                                           info->screen_base,
1608                                           priv->ch[i].dma_handle);
1609                 fb_dealloc_cmap(&info->cmap);
1610                 framebuffer_release(info);
1611         }
1612
1613         for (i = 0; i < ARRAY_SIZE(priv->ch); i++) {
1614                 if (priv->ch[i].bl)
1615                         sh_mobile_lcdc_bl_remove(priv->ch[i].bl);
1616         }
1617
1618         if (priv->dot_clk)
1619                 clk_put(priv->dot_clk);
1620
1621         if (priv->dev)
1622                 pm_runtime_disable(priv->dev);
1623
1624         if (priv->base)
1625                 iounmap(priv->base);
1626
1627         if (priv->irq)
1628                 free_irq(priv->irq, priv);
1629         kfree(priv);
1630         return 0;
1631 }
1632
1633 static struct platform_driver sh_mobile_lcdc_driver = {
1634         .driver         = {
1635                 .name           = "sh_mobile_lcdc_fb",
1636                 .owner          = THIS_MODULE,
1637                 .pm             = &sh_mobile_lcdc_dev_pm_ops,
1638         },
1639         .probe          = sh_mobile_lcdc_probe,
1640         .remove         = sh_mobile_lcdc_remove,
1641 };
1642
1643 static int __init sh_mobile_lcdc_init(void)
1644 {
1645         return platform_driver_register(&sh_mobile_lcdc_driver);
1646 }
1647
1648 static void __exit sh_mobile_lcdc_exit(void)
1649 {
1650         platform_driver_unregister(&sh_mobile_lcdc_driver);
1651 }
1652
1653 module_init(sh_mobile_lcdc_init);
1654 module_exit(sh_mobile_lcdc_exit);
1655
1656 MODULE_DESCRIPTION("SuperH Mobile LCDC Framebuffer driver");
1657 MODULE_AUTHOR("Magnus Damm <damm@opensource.se>");
1658 MODULE_LICENSE("GPL v2");