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MIPS: Yosemite, Emma: Fix off-by-two in arcs_cmdline buffer size check
[linux-2.6/linux-mips.git] / drivers / video / sh_mobile_lcdcfb.c
blob3a41c013d031678243df462e5c2d60e87c07db44
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 <video/sh_mobile_meram.h>
28 #include <linux/atomic.h>
29
30 #include "sh_mobile_lcdcfb.h"
31
32 #define SIDE_B_OFFSET 0x1000
33 #define MIRROR_OFFSET 0x2000
34
35 #define MAX_XRES 1920
36 #define MAX_YRES 1080
37
38 static unsigned long lcdc_offs_mainlcd[NR_CH_REGS] = {
39 [LDDCKPAT1R] = 0x400,
40 [LDDCKPAT2R] = 0x404,
41 [LDMT1R] = 0x418,
42 [LDMT2R] = 0x41c,
43 [LDMT3R] = 0x420,
44 [LDDFR] = 0x424,
45 [LDSM1R] = 0x428,
46 [LDSM2R] = 0x42c,
47 [LDSA1R] = 0x430,
48 [LDSA2R] = 0x434,
49 [LDMLSR] = 0x438,
50 [LDHCNR] = 0x448,
51 [LDHSYNR] = 0x44c,
52 [LDVLNR] = 0x450,
53 [LDVSYNR] = 0x454,
54 [LDPMR] = 0x460,
55 [LDHAJR] = 0x4a0,
56 };
57
58 static unsigned long lcdc_offs_sublcd[NR_CH_REGS] = {
59 [LDDCKPAT1R] = 0x408,
60 [LDDCKPAT2R] = 0x40c,
61 [LDMT1R] = 0x600,
62 [LDMT2R] = 0x604,
63 [LDMT3R] = 0x608,
64 [LDDFR] = 0x60c,
65 [LDSM1R] = 0x610,
66 [LDSM2R] = 0x614,
67 [LDSA1R] = 0x618,
68 [LDMLSR] = 0x620,
69 [LDHCNR] = 0x624,
70 [LDHSYNR] = 0x628,
71 [LDVLNR] = 0x62c,
72 [LDVSYNR] = 0x630,
73 [LDPMR] = 0x63c,
74 };
75
76 static const struct fb_videomode default_720p = {
77 .name = "HDMI 720p",
78 .xres = 1280,
79 .yres = 720,
80
81 .left_margin = 220,
82 .right_margin = 110,
83 .hsync_len = 40,
84
85 .upper_margin = 20,
86 .lower_margin = 5,
87 .vsync_len = 5,
88
89 .pixclock = 13468,
90 .refresh = 60,
91 .sync = FB_SYNC_VERT_HIGH_ACT | FB_SYNC_HOR_HIGH_ACT,
92 };
93
94 struct sh_mobile_lcdc_priv {
95 void __iomem *base;
96 int irq;
97 atomic_t hw_usecnt;
98 struct device *dev;
99 struct clk *dot_clk;
100 unsigned long lddckr;
101 struct sh_mobile_lcdc_chan ch[2];
102 struct notifier_block notifier;
103 int started;
104 int forced_bpp; /* 2 channel LCDC must share bpp setting */
105 struct sh_mobile_meram_info *meram_dev;
106 };
107
108 static bool banked(int reg_nr)
109 {
110 switch (reg_nr) {
111 case LDMT1R:
112 case LDMT2R:
113 case LDMT3R:
114 case LDDFR:
115 case LDSM1R:
116 case LDSA1R:
117 case LDSA2R:
118 case LDMLSR:
119 case LDHCNR:
120 case LDHSYNR:
121 case LDVLNR:
122 case LDVSYNR:
123 return true;
124 }
125 return false;
126 }
127
128 static void lcdc_write_chan(struct sh_mobile_lcdc_chan *chan,
129 int reg_nr, unsigned long data)
130 {
131 iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr]);
132 if (banked(reg_nr))
133 iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr] +
134 SIDE_B_OFFSET);
135 }
136
137 static void lcdc_write_chan_mirror(struct sh_mobile_lcdc_chan *chan,
138 int reg_nr, unsigned long data)
139 {
140 iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr] +
141 MIRROR_OFFSET);
142 }
143
144 static unsigned long lcdc_read_chan(struct sh_mobile_lcdc_chan *chan,
145 int reg_nr)
146 {
147 return ioread32(chan->lcdc->base + chan->reg_offs[reg_nr]);
148 }
149
150 static void lcdc_write(struct sh_mobile_lcdc_priv *priv,
151 unsigned long reg_offs, unsigned long data)
152 {
153 iowrite32(data, priv->base + reg_offs);
154 }
155
156 static unsigned long lcdc_read(struct sh_mobile_lcdc_priv *priv,
157 unsigned long reg_offs)
158 {
159 return ioread32(priv->base + reg_offs);
160 }
161
162 static void lcdc_wait_bit(struct sh_mobile_lcdc_priv *priv,
163 unsigned long reg_offs,
164 unsigned long mask, unsigned long until)
165 {
166 while ((lcdc_read(priv, reg_offs) & mask) != until)
167 cpu_relax();
168 }
169
170 static int lcdc_chan_is_sublcd(struct sh_mobile_lcdc_chan *chan)
171 {
172 return chan->cfg.chan == LCDC_CHAN_SUBLCD;
173 }
174
175 static void lcdc_sys_write_index(void *handle, unsigned long data)
176 {
177 struct sh_mobile_lcdc_chan *ch = handle;
178
179 lcdc_write(ch->lcdc, _LDDWD0R, data | LDDWDxR_WDACT);
180 lcdc_wait_bit(ch->lcdc, _LDSR, LDSR_AS, 0);
181 lcdc_write(ch->lcdc, _LDDWAR, LDDWAR_WA |
182 (lcdc_chan_is_sublcd(ch) ? 2 : 0));
183 lcdc_wait_bit(ch->lcdc, _LDSR, LDSR_AS, 0);
184 }
185
186 static void lcdc_sys_write_data(void *handle, unsigned long data)
187 {
188 struct sh_mobile_lcdc_chan *ch = handle;
189
190 lcdc_write(ch->lcdc, _LDDWD0R, data | LDDWDxR_WDACT | LDDWDxR_RSW);
191 lcdc_wait_bit(ch->lcdc, _LDSR, LDSR_AS, 0);
192 lcdc_write(ch->lcdc, _LDDWAR, LDDWAR_WA |
193 (lcdc_chan_is_sublcd(ch) ? 2 : 0));
194 lcdc_wait_bit(ch->lcdc, _LDSR, LDSR_AS, 0);
195 }
196
197 static unsigned long lcdc_sys_read_data(void *handle)
198 {
199 struct sh_mobile_lcdc_chan *ch = handle;
200
201 lcdc_write(ch->lcdc, _LDDRDR, LDDRDR_RSR);
202 lcdc_wait_bit(ch->lcdc, _LDSR, LDSR_AS, 0);
203 lcdc_write(ch->lcdc, _LDDRAR, LDDRAR_RA |
204 (lcdc_chan_is_sublcd(ch) ? 2 : 0));
205 udelay(1);
206 lcdc_wait_bit(ch->lcdc, _LDSR, LDSR_AS, 0);
207
208 return lcdc_read(ch->lcdc, _LDDRDR) & LDDRDR_DRD_MASK;
209 }
210
211 struct sh_mobile_lcdc_sys_bus_ops sh_mobile_lcdc_sys_bus_ops = {
212 lcdc_sys_write_index,
213 lcdc_sys_write_data,
214 lcdc_sys_read_data,
215 };
216
217 static void sh_mobile_lcdc_clk_on(struct sh_mobile_lcdc_priv *priv)
218 {
219 if (atomic_inc_and_test(&priv->hw_usecnt)) {
220 if (priv->dot_clk)
221 clk_enable(priv->dot_clk);
222 pm_runtime_get_sync(priv->dev);
223 if (priv->meram_dev && priv->meram_dev->pdev)
224 pm_runtime_get_sync(&priv->meram_dev->pdev->dev);
225 }
226 }
227
228 static void sh_mobile_lcdc_clk_off(struct sh_mobile_lcdc_priv *priv)
229 {
230 if (atomic_sub_return(1, &priv->hw_usecnt) == -1) {
231 if (priv->meram_dev && priv->meram_dev->pdev)
232 pm_runtime_put_sync(&priv->meram_dev->pdev->dev);
233 pm_runtime_put(priv->dev);
234 if (priv->dot_clk)
235 clk_disable(priv->dot_clk);
236 }
237 }
238
239 static int sh_mobile_lcdc_sginit(struct fb_info *info,
240 struct list_head *pagelist)
241 {
242 struct sh_mobile_lcdc_chan *ch = info->par;
243 unsigned int nr_pages_max = info->fix.smem_len >> PAGE_SHIFT;
244 struct page *page;
245 int nr_pages = 0;
246
247 sg_init_table(ch->sglist, nr_pages_max);
248
249 list_for_each_entry(page, pagelist, lru)
250 sg_set_page(&ch->sglist[nr_pages++], page, PAGE_SIZE, 0);
251
252 return nr_pages;
253 }
254
255 static void sh_mobile_lcdc_deferred_io(struct fb_info *info,
256 struct list_head *pagelist)
257 {
258 struct sh_mobile_lcdc_chan *ch = info->par;
259 struct sh_mobile_lcdc_board_cfg *bcfg = &ch->cfg.board_cfg;
260
261 /* enable clocks before accessing hardware */
262 sh_mobile_lcdc_clk_on(ch->lcdc);
263
264 /*
265 * It's possible to get here without anything on the pagelist via
266 * sh_mobile_lcdc_deferred_io_touch() or via a userspace fsync()
267 * invocation. In the former case, the acceleration routines are
268 * stepped in to when using the framebuffer console causing the
269 * workqueue to be scheduled without any dirty pages on the list.
270 *
271 * Despite this, a panel update is still needed given that the
272 * acceleration routines have their own methods for writing in
273 * that still need to be updated.
274 *
275 * The fsync() and empty pagelist case could be optimized for,
276 * but we don't bother, as any application exhibiting such
277 * behaviour is fundamentally broken anyways.
278 */
279 if (!list_empty(pagelist)) {
280 unsigned int nr_pages = sh_mobile_lcdc_sginit(info, pagelist);
281
282 /* trigger panel update */
283 dma_map_sg(info->dev, ch->sglist, nr_pages, DMA_TO_DEVICE);
284 if (bcfg->start_transfer)
285 bcfg->start_transfer(bcfg->board_data, ch,
286 &sh_mobile_lcdc_sys_bus_ops);
287 lcdc_write_chan(ch, LDSM2R, LDSM2R_OSTRG);
288 dma_unmap_sg(info->dev, ch->sglist, nr_pages, DMA_TO_DEVICE);
289 } else {
290 if (bcfg->start_transfer)
291 bcfg->start_transfer(bcfg->board_data, ch,
292 &sh_mobile_lcdc_sys_bus_ops);
293 lcdc_write_chan(ch, LDSM2R, LDSM2R_OSTRG);
294 }
295 }
296
297 static void sh_mobile_lcdc_deferred_io_touch(struct fb_info *info)
298 {
299 struct fb_deferred_io *fbdefio = info->fbdefio;
300
301 if (fbdefio)
302 schedule_delayed_work(&info->deferred_work, fbdefio->delay);
303 }
304
305 static irqreturn_t sh_mobile_lcdc_irq(int irq, void *data)
306 {
307 struct sh_mobile_lcdc_priv *priv = data;
308 struct sh_mobile_lcdc_chan *ch;
309 unsigned long ldintr;
310 int is_sub;
311 int k;
312
313 /* Acknowledge interrupts and disable further VSYNC End IRQs. */
314 ldintr = lcdc_read(priv, _LDINTR);
315 lcdc_write(priv, _LDINTR, (ldintr ^ LDINTR_STATUS_MASK) & ~LDINTR_VEE);
316
317 /* figure out if this interrupt is for main or sub lcd */
318 is_sub = (lcdc_read(priv, _LDSR) & LDSR_MSS) ? 1 : 0;
319
320 /* wake up channel and disable clocks */
321 for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
322 ch = &priv->ch[k];
323
324 if (!ch->enabled)
325 continue;
326
327 /* Frame End */
328 if (ldintr & LDINTR_FS) {
329 if (is_sub == lcdc_chan_is_sublcd(ch)) {
330 ch->frame_end = 1;
331 wake_up(&ch->frame_end_wait);
332
333 sh_mobile_lcdc_clk_off(priv);
334 }
335 }
336
337 /* VSYNC End */
338 if (ldintr & LDINTR_VES)
339 complete(&ch->vsync_completion);
340 }
341
342 return IRQ_HANDLED;
343 }
344
345 static void sh_mobile_lcdc_start_stop(struct sh_mobile_lcdc_priv *priv,
346 int start)
347 {
348 unsigned long tmp = lcdc_read(priv, _LDCNT2R);
349 int k;
350
351 /* start or stop the lcdc */
352 if (start)
353 lcdc_write(priv, _LDCNT2R, tmp | LDCNT2R_DO);
354 else
355 lcdc_write(priv, _LDCNT2R, tmp & ~LDCNT2R_DO);
356
357 /* wait until power is applied/stopped on all channels */
358 for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
359 if (lcdc_read(priv, _LDCNT2R) & priv->ch[k].enabled)
360 while (1) {
361 tmp = lcdc_read_chan(&priv->ch[k], LDPMR)
362 & LDPMR_LPS;
363 if (start && tmp == LDPMR_LPS)
364 break;
365 if (!start && tmp == 0)
366 break;
367 cpu_relax();
368 }
369
370 if (!start)
371 lcdc_write(priv, _LDDCKSTPR, 1); /* stop dotclock */
372 }
373
374 static void sh_mobile_lcdc_geometry(struct sh_mobile_lcdc_chan *ch)
375 {
376 struct fb_var_screeninfo *var = &ch->info->var, *display_var = &ch->display_var;
377 unsigned long h_total, hsync_pos, display_h_total;
378 u32 tmp;
379
380 tmp = ch->ldmt1r_value;
381 tmp |= (var->sync & FB_SYNC_VERT_HIGH_ACT) ? 0 : LDMT1R_VPOL;
382 tmp |= (var->sync & FB_SYNC_HOR_HIGH_ACT) ? 0 : LDMT1R_HPOL;
383 tmp |= (ch->cfg.flags & LCDC_FLAGS_DWPOL) ? LDMT1R_DWPOL : 0;
384 tmp |= (ch->cfg.flags & LCDC_FLAGS_DIPOL) ? LDMT1R_DIPOL : 0;
385 tmp |= (ch->cfg.flags & LCDC_FLAGS_DAPOL) ? LDMT1R_DAPOL : 0;
386 tmp |= (ch->cfg.flags & LCDC_FLAGS_HSCNT) ? LDMT1R_HSCNT : 0;
387 tmp |= (ch->cfg.flags & LCDC_FLAGS_DWCNT) ? LDMT1R_DWCNT : 0;
388 lcdc_write_chan(ch, LDMT1R, tmp);
389
390 /* setup SYS bus */
391 lcdc_write_chan(ch, LDMT2R, ch->cfg.sys_bus_cfg.ldmt2r);
392 lcdc_write_chan(ch, LDMT3R, ch->cfg.sys_bus_cfg.ldmt3r);
393
394 /* horizontal configuration */
395 h_total = display_var->xres + display_var->hsync_len +
396 display_var->left_margin + display_var->right_margin;
397 tmp = h_total / 8; /* HTCN */
398 tmp |= (min(display_var->xres, var->xres) / 8) << 16; /* HDCN */
399 lcdc_write_chan(ch, LDHCNR, tmp);
400
401 hsync_pos = display_var->xres + display_var->right_margin;
402 tmp = hsync_pos / 8; /* HSYNP */
403 tmp |= (display_var->hsync_len / 8) << 16; /* HSYNW */
404 lcdc_write_chan(ch, LDHSYNR, tmp);
405
406 /* vertical configuration */
407 tmp = display_var->yres + display_var->vsync_len +
408 display_var->upper_margin + display_var->lower_margin; /* VTLN */
409 tmp |= min(display_var->yres, var->yres) << 16; /* VDLN */
410 lcdc_write_chan(ch, LDVLNR, tmp);
411
412 tmp = display_var->yres + display_var->lower_margin; /* VSYNP */
413 tmp |= display_var->vsync_len << 16; /* VSYNW */
414 lcdc_write_chan(ch, LDVSYNR, tmp);
415
416 /* Adjust horizontal synchronisation for HDMI */
417 display_h_total = display_var->xres + display_var->hsync_len +
418 display_var->left_margin + display_var->right_margin;
419 tmp = ((display_var->xres & 7) << 24) |
420 ((display_h_total & 7) << 16) |
421 ((display_var->hsync_len & 7) << 8) |
422 hsync_pos;
423 lcdc_write_chan(ch, LDHAJR, tmp);
424 }
425
426 /*
427 * __sh_mobile_lcdc_start - Configure and tart the LCDC
428 * @priv: LCDC device
429 *
430 * Configure all enabled channels and start the LCDC device. All external
431 * devices (clocks, MERAM, panels, ...) are not touched by this function.
432 */
433 static void __sh_mobile_lcdc_start(struct sh_mobile_lcdc_priv *priv)
434 {
435 struct sh_mobile_lcdc_chan *ch;
436 unsigned long tmp;
437 int bpp = 0;
438 int k, m;
439
440 /* Enable LCDC channels. Read data from external memory, avoid using the
441 * BEU for now.
442 */
443 lcdc_write(priv, _LDCNT2R, priv->ch[0].enabled | priv->ch[1].enabled);
444
445 /* Stop the LCDC first and disable all interrupts. */
446 sh_mobile_lcdc_start_stop(priv, 0);
447 lcdc_write(priv, _LDINTR, 0);
448
449 /* Configure power supply, dot clocks and start them. */
450 tmp = priv->lddckr;
451 for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
452 ch = &priv->ch[k];
453 if (!ch->enabled)
454 continue;
455
456 if (!bpp)
457 bpp = ch->info->var.bits_per_pixel;
458
459 /* Power supply */
460 lcdc_write_chan(ch, LDPMR, 0);
461
462 m = ch->cfg.clock_divider;
463 if (!m)
464 continue;
465
466 /* FIXME: sh7724 can only use 42, 48, 54 and 60 for the divider
467 * denominator.
468 */
469 lcdc_write_chan(ch, LDDCKPAT1R, 0);
470 lcdc_write_chan(ch, LDDCKPAT2R, (1 << (m/2)) - 1);
471
472 if (m == 1)
473 m = LDDCKR_MOSEL;
474 tmp |= m << (lcdc_chan_is_sublcd(ch) ? 8 : 0);
475 }
476
477 lcdc_write(priv, _LDDCKR, tmp);
478 lcdc_write(priv, _LDDCKSTPR, 0);
479 lcdc_wait_bit(priv, _LDDCKSTPR, ~0, 0);
480
481 /* Setup geometry, format, frame buffer memory and operation mode. */
482 for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
483 ch = &priv->ch[k];
484 if (!ch->enabled)
485 continue;
486
487 sh_mobile_lcdc_geometry(ch);
488
489 if (ch->info->var.nonstd) {
490 tmp = (ch->info->var.nonstd << 16);
491 switch (ch->info->var.bits_per_pixel) {
492 case 12:
493 tmp |= LDDFR_YF_420;
494 break;
495 case 16:
496 tmp |= LDDFR_YF_422;
497 break;
498 case 24:
499 default:
500 tmp |= LDDFR_YF_444;
501 break;
502 }
503 } else {
504 switch (ch->info->var.bits_per_pixel) {
505 case 16:
506 tmp = LDDFR_PKF_RGB16;
507 break;
508 case 24:
509 tmp = LDDFR_PKF_RGB24;
510 break;
511 case 32:
512 default:
513 tmp = LDDFR_PKF_ARGB32;
514 break;
515 }
516 }
517
518 lcdc_write_chan(ch, LDDFR, tmp);
519 lcdc_write_chan(ch, LDMLSR, ch->pitch);
520 lcdc_write_chan(ch, LDSA1R, ch->base_addr_y);
521 if (ch->info->var.nonstd)
522 lcdc_write_chan(ch, LDSA2R, ch->base_addr_c);
523
524 /* When using deferred I/O mode, configure the LCDC for one-shot
525 * operation and enable the frame end interrupt. Otherwise use
526 * continuous read mode.
527 */
528 if (ch->ldmt1r_value & LDMT1R_IFM &&
529 ch->cfg.sys_bus_cfg.deferred_io_msec) {
530 lcdc_write_chan(ch, LDSM1R, LDSM1R_OS);
531 lcdc_write(priv, _LDINTR, LDINTR_FE);
532 } else {
533 lcdc_write_chan(ch, LDSM1R, 0);
534 }
535 }
536
537 /* Word and long word swap. */
538 if (priv->ch[0].info->var.nonstd)
539 tmp = LDDDSR_LS | LDDDSR_WS | LDDDSR_BS;
540 else {
541 switch (bpp) {
542 case 16:
543 tmp = LDDDSR_LS | LDDDSR_WS;
544 break;
545 case 24:
546 tmp = LDDDSR_LS | LDDDSR_WS | LDDDSR_BS;
547 break;
548 case 32:
549 default:
550 tmp = LDDDSR_LS;
551 break;
552 }
553 }
554 lcdc_write(priv, _LDDDSR, tmp);
555
556 /* Enable the display output. */
557 lcdc_write(priv, _LDCNT1R, LDCNT1R_DE);
558 sh_mobile_lcdc_start_stop(priv, 1);
559 priv->started = 1;
560 }
561
562 static int sh_mobile_lcdc_start(struct sh_mobile_lcdc_priv *priv)
563 {
564 struct sh_mobile_meram_info *mdev = priv->meram_dev;
565 struct sh_mobile_lcdc_board_cfg *board_cfg;
566 struct sh_mobile_lcdc_chan *ch;
567 unsigned long tmp;
568 int ret;
569 int k;
570
571 /* enable clocks before accessing the hardware */
572 for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
573 if (priv->ch[k].enabled)
574 sh_mobile_lcdc_clk_on(priv);
575 }
576
577 /* reset */
578 lcdc_write(priv, _LDCNT2R, lcdc_read(priv, _LDCNT2R) | LDCNT2R_BR);
579 lcdc_wait_bit(priv, _LDCNT2R, LDCNT2R_BR, 0);
580
581 for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
582 ch = &priv->ch[k];
583
584 if (!ch->enabled)
585 continue;
586
587 board_cfg = &ch->cfg.board_cfg;
588 if (board_cfg->setup_sys) {
589 ret = board_cfg->setup_sys(board_cfg->board_data, ch,
590 &sh_mobile_lcdc_sys_bus_ops);
591 if (ret)
592 return ret;
593 }
594 }
595
596 /* Compute frame buffer base address and pitch for each channel. */
597 for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
598 struct sh_mobile_meram_cfg *cfg;
599 int pixelformat;
600
601 ch = &priv->ch[k];
602 if (!ch->enabled)
603 continue;
604
605 ch->base_addr_y = ch->info->fix.smem_start;
606 ch->base_addr_c = ch->base_addr_y
607 + ch->info->var.xres
608 * ch->info->var.yres_virtual;
609 ch->pitch = ch->info->fix.line_length;
610
611 /* Enable MERAM if possible. */
612 cfg = ch->cfg.meram_cfg;
613 if (mdev == NULL || mdev->ops == NULL || cfg == NULL)
614 continue;
615
616 /* we need to de-init configured ICBs before we can
617 * re-initialize them.
618 */
619 if (ch->meram_enabled) {
620 mdev->ops->meram_unregister(mdev, cfg);
621 ch->meram_enabled = 0;
622 }
623
624 if (!ch->info->var.nonstd)
625 pixelformat = SH_MOBILE_MERAM_PF_RGB;
626 else if (ch->info->var.bits_per_pixel == 24)
627 pixelformat = SH_MOBILE_MERAM_PF_NV24;
628 else
629 pixelformat = SH_MOBILE_MERAM_PF_NV;
630
631 ret = mdev->ops->meram_register(mdev, cfg, ch->pitch,
632 ch->info->var.yres, pixelformat,
633 ch->base_addr_y, ch->base_addr_c,
634 &ch->base_addr_y, &ch->base_addr_c,
635 &ch->pitch);
636 if (!ret)
637 ch->meram_enabled = 1;
638 }
639
640 /* Start the LCDC. */
641 __sh_mobile_lcdc_start(priv);
642
643 /* Setup deferred I/O, tell the board code to enable the panels, and
644 * turn backlight on.
645 */
646 for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
647 ch = &priv->ch[k];
648 if (!ch->enabled)
649 continue;
650
651 tmp = ch->cfg.sys_bus_cfg.deferred_io_msec;
652 if (ch->ldmt1r_value & LDMT1R_IFM && tmp) {
653 ch->defio.deferred_io = sh_mobile_lcdc_deferred_io;
654 ch->defio.delay = msecs_to_jiffies(tmp);
655 ch->info->fbdefio = &ch->defio;
656 fb_deferred_io_init(ch->info);
657 }
658
659 board_cfg = &ch->cfg.board_cfg;
660 if (board_cfg->display_on && try_module_get(board_cfg->owner)) {
661 board_cfg->display_on(board_cfg->board_data, ch->info);
662 module_put(board_cfg->owner);
663 }
664
665 if (ch->bl) {
666 ch->bl->props.power = FB_BLANK_UNBLANK;
667 backlight_update_status(ch->bl);
668 }
669 }
670
671 return 0;
672 }
673
674 static void sh_mobile_lcdc_stop(struct sh_mobile_lcdc_priv *priv)
675 {
676 struct sh_mobile_lcdc_chan *ch;
677 struct sh_mobile_lcdc_board_cfg *board_cfg;
678 int k;
679
680 /* clean up deferred io and ask board code to disable panel */
681 for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
682 ch = &priv->ch[k];
683 if (!ch->enabled)
684 continue;
685
686 /* deferred io mode:
687 * flush frame, and wait for frame end interrupt
688 * clean up deferred io and enable clock
689 */
690 if (ch->info && ch->info->fbdefio) {
691 ch->frame_end = 0;
692 schedule_delayed_work(&ch->info->deferred_work, 0);
693 wait_event(ch->frame_end_wait, ch->frame_end);
694 fb_deferred_io_cleanup(ch->info);
695 ch->info->fbdefio = NULL;
696 sh_mobile_lcdc_clk_on(priv);
697 }
698
699 if (ch->bl) {
700 ch->bl->props.power = FB_BLANK_POWERDOWN;
701 backlight_update_status(ch->bl);
702 }
703
704 board_cfg = &ch->cfg.board_cfg;
705 if (board_cfg->display_off && try_module_get(board_cfg->owner)) {
706 board_cfg->display_off(board_cfg->board_data);
707 module_put(board_cfg->owner);
708 }
709
710 /* disable the meram */
711 if (ch->meram_enabled) {
712 struct sh_mobile_meram_cfg *cfg;
713 struct sh_mobile_meram_info *mdev;
714 cfg = ch->cfg.meram_cfg;
715 mdev = priv->meram_dev;
716 mdev->ops->meram_unregister(mdev, cfg);
717 ch->meram_enabled = 0;
718 }
719
720 }
721
722 /* stop the lcdc */
723 if (priv->started) {
724 sh_mobile_lcdc_start_stop(priv, 0);
725 priv->started = 0;
726 }
727
728 /* stop clocks */
729 for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
730 if (priv->ch[k].enabled)
731 sh_mobile_lcdc_clk_off(priv);
732 }
733
734 static int sh_mobile_lcdc_check_interface(struct sh_mobile_lcdc_chan *ch)
735 {
736 int interface_type = ch->cfg.interface_type;
737
738 switch (interface_type) {
739 case RGB8:
740 case RGB9:
741 case RGB12A:
742 case RGB12B:
743 case RGB16:
744 case RGB18:
745 case RGB24:
746 case SYS8A:
747 case SYS8B:
748 case SYS8C:
749 case SYS8D:
750 case SYS9:
751 case SYS12:
752 case SYS16A:
753 case SYS16B:
754 case SYS16C:
755 case SYS18:
756 case SYS24:
757 break;
758 default:
759 return -EINVAL;
760 }
761
762 /* SUBLCD only supports SYS interface */
763 if (lcdc_chan_is_sublcd(ch)) {
764 if (!(interface_type & LDMT1R_IFM))
765 return -EINVAL;
766
767 interface_type &= ~LDMT1R_IFM;
768 }
769
770 ch->ldmt1r_value = interface_type;
771 return 0;
772 }
773
774 static int sh_mobile_lcdc_setup_clocks(struct platform_device *pdev,
775 int clock_source,
776 struct sh_mobile_lcdc_priv *priv)
777 {
778 char *str;
779
780 switch (clock_source) {
781 case LCDC_CLK_BUS:
782 str = "bus_clk";
783 priv->lddckr = LDDCKR_ICKSEL_BUS;
784 break;
785 case LCDC_CLK_PERIPHERAL:
786 str = "peripheral_clk";
787 priv->lddckr = LDDCKR_ICKSEL_MIPI;
788 break;
789 case LCDC_CLK_EXTERNAL:
790 str = NULL;
791 priv->lddckr = LDDCKR_ICKSEL_HDMI;
792 break;
793 default:
794 return -EINVAL;
795 }
796
797 if (str) {
798 priv->dot_clk = clk_get(&pdev->dev, str);
799 if (IS_ERR(priv->dot_clk)) {
800 dev_err(&pdev->dev, "cannot get dot clock %s\n", str);
801 return PTR_ERR(priv->dot_clk);
802 }
803 }
804
805 /* Runtime PM support involves two step for this driver:
806 * 1) Enable Runtime PM
807 * 2) Force Runtime PM Resume since hardware is accessed from probe()
808 */
809 priv->dev = &pdev->dev;
810 pm_runtime_enable(priv->dev);
811 pm_runtime_resume(priv->dev);
812 return 0;
813 }
814
815 static int sh_mobile_lcdc_setcolreg(u_int regno,
816 u_int red, u_int green, u_int blue,
817 u_int transp, struct fb_info *info)
818 {
819 u32 *palette = info->pseudo_palette;
820
821 if (regno >= PALETTE_NR)
822 return -EINVAL;
823
824 /* only FB_VISUAL_TRUECOLOR supported */
825
826 red >>= 16 - info->var.red.length;
827 green >>= 16 - info->var.green.length;
828 blue >>= 16 - info->var.blue.length;
829 transp >>= 16 - info->var.transp.length;
830
831 palette[regno] = (red << info->var.red.offset) |
832 (green << info->var.green.offset) |
833 (blue << info->var.blue.offset) |
834 (transp << info->var.transp.offset);
835
836 return 0;
837 }
838
839 static struct fb_fix_screeninfo sh_mobile_lcdc_fix = {
840 .id = "SH Mobile LCDC",
841 .type = FB_TYPE_PACKED_PIXELS,
842 .visual = FB_VISUAL_TRUECOLOR,
843 .accel = FB_ACCEL_NONE,
844 .xpanstep = 0,
845 .ypanstep = 1,
846 .ywrapstep = 0,
847 };
848
849 static void sh_mobile_lcdc_fillrect(struct fb_info *info,
850 const struct fb_fillrect *rect)
851 {
852 sys_fillrect(info, rect);
853 sh_mobile_lcdc_deferred_io_touch(info);
854 }
855
856 static void sh_mobile_lcdc_copyarea(struct fb_info *info,
857 const struct fb_copyarea *area)
858 {
859 sys_copyarea(info, area);
860 sh_mobile_lcdc_deferred_io_touch(info);
861 }
862
863 static void sh_mobile_lcdc_imageblit(struct fb_info *info,
864 const struct fb_image *image)
865 {
866 sys_imageblit(info, image);
867 sh_mobile_lcdc_deferred_io_touch(info);
868 }
869
870 static int sh_mobile_fb_pan_display(struct fb_var_screeninfo *var,
871 struct fb_info *info)
872 {
873 struct sh_mobile_lcdc_chan *ch = info->par;
874 struct sh_mobile_lcdc_priv *priv = ch->lcdc;
875 unsigned long ldrcntr;
876 unsigned long new_pan_offset;
877 unsigned long base_addr_y, base_addr_c;
878 unsigned long c_offset;
879
880 if (!info->var.nonstd)
881 new_pan_offset = var->yoffset * info->fix.line_length
882 + var->xoffset * (info->var.bits_per_pixel / 8);
883 else
884 new_pan_offset = var->yoffset * info->fix.line_length
885 + var->xoffset;
886
887 if (new_pan_offset == ch->pan_offset)
888 return 0; /* No change, do nothing */
889
890 ldrcntr = lcdc_read(priv, _LDRCNTR);
891
892 /* Set the source address for the next refresh */
893 base_addr_y = ch->dma_handle + new_pan_offset;
894 if (info->var.nonstd) {
895 /* Set y offset */
896 c_offset = var->yoffset * info->fix.line_length
897 * (info->var.bits_per_pixel - 8) / 8;
898 base_addr_c = ch->dma_handle
899 + info->var.xres * info->var.yres_virtual
900 + c_offset;
901 /* Set x offset */
902 if (info->var.bits_per_pixel == 24)
903 base_addr_c += 2 * var->xoffset;
904 else
905 base_addr_c += var->xoffset;
906 }
907
908 if (ch->meram_enabled) {
909 struct sh_mobile_meram_cfg *cfg;
910 struct sh_mobile_meram_info *mdev;
911 int ret;
912
913 cfg = ch->cfg.meram_cfg;
914 mdev = priv->meram_dev;
915 ret = mdev->ops->meram_update(mdev, cfg,
916 base_addr_y, base_addr_c,
917 &base_addr_y, &base_addr_c);
918 if (ret)
919 return ret;
920 }
921
922 ch->base_addr_y = base_addr_y;
923 ch->base_addr_c = base_addr_c;
924
925 lcdc_write_chan_mirror(ch, LDSA1R, base_addr_y);
926 if (info->var.nonstd)
927 lcdc_write_chan_mirror(ch, LDSA2R, base_addr_c);
928
929 if (lcdc_chan_is_sublcd(ch))
930 lcdc_write(ch->lcdc, _LDRCNTR, ldrcntr ^ LDRCNTR_SRS);
931 else
932 lcdc_write(ch->lcdc, _LDRCNTR, ldrcntr ^ LDRCNTR_MRS);
933
934 ch->pan_offset = new_pan_offset;
935
936 sh_mobile_lcdc_deferred_io_touch(info);
937
938 return 0;
939 }
940
941 static int sh_mobile_wait_for_vsync(struct fb_info *info)
942 {
943 struct sh_mobile_lcdc_chan *ch = info->par;
944 unsigned long ldintr;
945 int ret;
946
947 /* Enable VSync End interrupt and be careful not to acknowledge any
948 * pending interrupt.
949 */
950 ldintr = lcdc_read(ch->lcdc, _LDINTR);
951 ldintr |= LDINTR_VEE | LDINTR_STATUS_MASK;
952 lcdc_write(ch->lcdc, _LDINTR, ldintr);
953
954 ret = wait_for_completion_interruptible_timeout(&ch->vsync_completion,
955 msecs_to_jiffies(100));
956 if (!ret)
957 return -ETIMEDOUT;
958
959 return 0;
960 }
961
962 static int sh_mobile_ioctl(struct fb_info *info, unsigned int cmd,
963 unsigned long arg)
964 {
965 int retval;
966
967 switch (cmd) {
968 case FBIO_WAITFORVSYNC:
969 retval = sh_mobile_wait_for_vsync(info);
970 break;
971
972 default:
973 retval = -ENOIOCTLCMD;
974 break;
975 }
976 return retval;
977 }
978
979 static void sh_mobile_fb_reconfig(struct fb_info *info)
980 {
981 struct sh_mobile_lcdc_chan *ch = info->par;
982 struct fb_videomode mode1, mode2;
983 struct fb_event event;
984 int evnt = FB_EVENT_MODE_CHANGE_ALL;
985
986 if (ch->use_count > 1 || (ch->use_count == 1 && !info->fbcon_par))
987 /* More framebuffer users are active */
988 return;
989
990 fb_var_to_videomode(&mode1, &ch->display_var);
991 fb_var_to_videomode(&mode2, &info->var);
992
993 if (fb_mode_is_equal(&mode1, &mode2))
994 return;
995
996 /* Display has been re-plugged, framebuffer is free now, reconfigure */
997 if (fb_set_var(info, &ch->display_var) < 0)
998 /* Couldn't reconfigure, hopefully, can continue as before */
999 return;
1000
1001 /*
1002 * fb_set_var() calls the notifier change internally, only if
1003 * FBINFO_MISC_USEREVENT flag is set. Since we do not want to fake a
1004 * user event, we have to call the chain ourselves.
1005 */
1006 event.info = info;
1007 event.data = &mode1;
1008 fb_notifier_call_chain(evnt, &event);
1009 }
1010
1011 /*
1012 * Locking: both .fb_release() and .fb_open() are called with info->lock held if
1013 * user == 1, or with console sem held, if user == 0.
1014 */
1015 static int sh_mobile_release(struct fb_info *info, int user)
1016 {
1017 struct sh_mobile_lcdc_chan *ch = info->par;
1018
1019 mutex_lock(&ch->open_lock);
1020 dev_dbg(info->dev, "%s(): %d users\n", __func__, ch->use_count);
1021
1022 ch->use_count--;
1023
1024 /* Nothing to reconfigure, when called from fbcon */
1025 if (user) {
1026 console_lock();
1027 sh_mobile_fb_reconfig(info);
1028 console_unlock();
1029 }
1030
1031 mutex_unlock(&ch->open_lock);
1032
1033 return 0;
1034 }
1035
1036 static int sh_mobile_open(struct fb_info *info, int user)
1037 {
1038 struct sh_mobile_lcdc_chan *ch = info->par;
1039
1040 mutex_lock(&ch->open_lock);
1041 ch->use_count++;
1042
1043 dev_dbg(info->dev, "%s(): %d users\n", __func__, ch->use_count);
1044 mutex_unlock(&ch->open_lock);
1045
1046 return 0;
1047 }
1048
1049 static int sh_mobile_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
1050 {
1051 struct sh_mobile_lcdc_chan *ch = info->par;
1052 struct sh_mobile_lcdc_priv *p = ch->lcdc;
1053 unsigned int best_dist = (unsigned int)-1;
1054 unsigned int best_xres = 0;
1055 unsigned int best_yres = 0;
1056 unsigned int i;
1057
1058 if (var->xres > MAX_XRES || var->yres > MAX_YRES)
1059 return -EINVAL;
1060
1061 /* If board code provides us with a list of available modes, make sure
1062 * we use one of them. Find the mode closest to the requested one. The
1063 * distance between two modes is defined as the size of the
1064 * non-overlapping parts of the two rectangles.
1065 */
1066 for (i = 0; i < ch->cfg.num_cfg; ++i) {
1067 const struct fb_videomode *mode = &ch->cfg.lcd_cfg[i];
1068 unsigned int dist;
1069
1070 /* We can only round up. */
1071 if (var->xres > mode->xres || var->yres > mode->yres)
1072 continue;
1073
1074 dist = var->xres * var->yres + mode->xres * mode->yres
1075 - 2 * min(var->xres, mode->xres)
1076 * min(var->yres, mode->yres);
1077
1078 if (dist < best_dist) {
1079 best_xres = mode->xres;
1080 best_yres = mode->yres;
1081 best_dist = dist;
1082 }
1083 }
1084
1085 /* If no available mode can be used, return an error. */
1086 if (ch->cfg.num_cfg != 0) {
1087 if (best_dist == (unsigned int)-1)
1088 return -EINVAL;
1089
1090 var->xres = best_xres;
1091 var->yres = best_yres;
1092 }
1093
1094 /* Make sure the virtual resolution is at least as big as the visible
1095 * resolution.
1096 */
1097 if (var->xres_virtual < var->xres)
1098 var->xres_virtual = var->xres;
1099 if (var->yres_virtual < var->yres)
1100 var->yres_virtual = var->yres;
1101
1102 if (var->bits_per_pixel <= 16) { /* RGB 565 */
1103 var->bits_per_pixel = 16;
1104 var->red.offset = 11;
1105 var->red.length = 5;
1106 var->green.offset = 5;
1107 var->green.length = 6;
1108 var->blue.offset = 0;
1109 var->blue.length = 5;
1110 var->transp.offset = 0;
1111 var->transp.length = 0;
1112 } else if (var->bits_per_pixel <= 24) { /* RGB 888 */
1113 var->bits_per_pixel = 24;
1114 var->red.offset = 16;
1115 var->red.length = 8;
1116 var->green.offset = 8;
1117 var->green.length = 8;
1118 var->blue.offset = 0;
1119 var->blue.length = 8;
1120 var->transp.offset = 0;
1121 var->transp.length = 0;
1122 } else if (var->bits_per_pixel <= 32) { /* RGBA 888 */
1123 var->bits_per_pixel = 32;
1124 var->red.offset = 16;
1125 var->red.length = 8;
1126 var->green.offset = 8;
1127 var->green.length = 8;
1128 var->blue.offset = 0;
1129 var->blue.length = 8;
1130 var->transp.offset = 24;
1131 var->transp.length = 8;
1132 } else
1133 return -EINVAL;
1134
1135 var->red.msb_right = 0;
1136 var->green.msb_right = 0;
1137 var->blue.msb_right = 0;
1138 var->transp.msb_right = 0;
1139
1140 /* Make sure we don't exceed our allocated memory. */
1141 if (var->xres_virtual * var->yres_virtual * var->bits_per_pixel / 8 >
1142 info->fix.smem_len)
1143 return -EINVAL;
1144
1145 /* only accept the forced_bpp for dual channel configurations */
1146 if (p->forced_bpp && p->forced_bpp != var->bits_per_pixel)
1147 return -EINVAL;
1148
1149 return 0;
1150 }
1151
1152 static int sh_mobile_set_par(struct fb_info *info)
1153 {
1154 struct sh_mobile_lcdc_chan *ch = info->par;
1155 u32 line_length = info->fix.line_length;
1156 int ret;
1157
1158 sh_mobile_lcdc_stop(ch->lcdc);
1159
1160 if (info->var.nonstd)
1161 info->fix.line_length = info->var.xres;
1162 else
1163 info->fix.line_length = info->var.xres
1164 * info->var.bits_per_pixel / 8;
1165
1166 ret = sh_mobile_lcdc_start(ch->lcdc);
1167 if (ret < 0) {
1168 dev_err(info->dev, "%s: unable to restart LCDC\n", __func__);
1169 info->fix.line_length = line_length;
1170 }
1171
1172 return ret;
1173 }
1174
1175 /*
1176 * Screen blanking. Behavior is as follows:
1177 * FB_BLANK_UNBLANK: screen unblanked, clocks enabled
1178 * FB_BLANK_NORMAL: screen blanked, clocks enabled
1179 * FB_BLANK_VSYNC,
1180 * FB_BLANK_HSYNC,
1181 * FB_BLANK_POWEROFF: screen blanked, clocks disabled
1182 */
1183 static int sh_mobile_lcdc_blank(int blank, struct fb_info *info)
1184 {
1185 struct sh_mobile_lcdc_chan *ch = info->par;
1186 struct sh_mobile_lcdc_priv *p = ch->lcdc;
1187
1188 /* blank the screen? */
1189 if (blank > FB_BLANK_UNBLANK && ch->blank_status == FB_BLANK_UNBLANK) {
1190 struct fb_fillrect rect = {
1191 .width = info->var.xres,
1192 .height = info->var.yres,
1193 };
1194 sh_mobile_lcdc_fillrect(info, &rect);
1195 }
1196 /* turn clocks on? */
1197 if (blank <= FB_BLANK_NORMAL && ch->blank_status > FB_BLANK_NORMAL) {
1198 sh_mobile_lcdc_clk_on(p);
1199 }
1200 /* turn clocks off? */
1201 if (blank > FB_BLANK_NORMAL && ch->blank_status <= FB_BLANK_NORMAL) {
1202 /* make sure the screen is updated with the black fill before
1203 * switching the clocks off. one vsync is not enough since
1204 * blanking may occur in the middle of a refresh. deferred io
1205 * mode will reenable the clocks and update the screen in time,
1206 * so it does not need this. */
1207 if (!info->fbdefio) {
1208 sh_mobile_wait_for_vsync(info);
1209 sh_mobile_wait_for_vsync(info);
1210 }
1211 sh_mobile_lcdc_clk_off(p);
1212 }
1213
1214 ch->blank_status = blank;
1215 return 0;
1216 }
1217
1218 static struct fb_ops sh_mobile_lcdc_ops = {
1219 .owner = THIS_MODULE,
1220 .fb_setcolreg = sh_mobile_lcdc_setcolreg,
1221 .fb_read = fb_sys_read,
1222 .fb_write = fb_sys_write,
1223 .fb_fillrect = sh_mobile_lcdc_fillrect,
1224 .fb_copyarea = sh_mobile_lcdc_copyarea,
1225 .fb_imageblit = sh_mobile_lcdc_imageblit,
1226 .fb_blank = sh_mobile_lcdc_blank,
1227 .fb_pan_display = sh_mobile_fb_pan_display,
1228 .fb_ioctl = sh_mobile_ioctl,
1229 .fb_open = sh_mobile_open,
1230 .fb_release = sh_mobile_release,
1231 .fb_check_var = sh_mobile_check_var,
1232 .fb_set_par = sh_mobile_set_par,
1233 };
1234
1235 static int sh_mobile_lcdc_update_bl(struct backlight_device *bdev)
1236 {
1237 struct sh_mobile_lcdc_chan *ch = bl_get_data(bdev);
1238 struct sh_mobile_lcdc_board_cfg *cfg = &ch->cfg.board_cfg;
1239 int brightness = bdev->props.brightness;
1240
1241 if (bdev->props.power != FB_BLANK_UNBLANK ||
1242 bdev->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
1243 brightness = 0;
1244
1245 return cfg->set_brightness(cfg->board_data, brightness);
1246 }
1247
1248 static int sh_mobile_lcdc_get_brightness(struct backlight_device *bdev)
1249 {
1250 struct sh_mobile_lcdc_chan *ch = bl_get_data(bdev);
1251 struct sh_mobile_lcdc_board_cfg *cfg = &ch->cfg.board_cfg;
1252
1253 return cfg->get_brightness(cfg->board_data);
1254 }
1255
1256 static int sh_mobile_lcdc_check_fb(struct backlight_device *bdev,
1257 struct fb_info *info)
1258 {
1259 return (info->bl_dev == bdev);
1260 }
1261
1262 static struct backlight_ops sh_mobile_lcdc_bl_ops = {
1263 .options = BL_CORE_SUSPENDRESUME,
1264 .update_status = sh_mobile_lcdc_update_bl,
1265 .get_brightness = sh_mobile_lcdc_get_brightness,
1266 .check_fb = sh_mobile_lcdc_check_fb,
1267 };
1268
1269 static struct backlight_device *sh_mobile_lcdc_bl_probe(struct device *parent,
1270 struct sh_mobile_lcdc_chan *ch)
1271 {
1272 struct backlight_device *bl;
1273
1274 bl = backlight_device_register(ch->cfg.bl_info.name, parent, ch,
1275 &sh_mobile_lcdc_bl_ops, NULL);
1276 if (IS_ERR(bl)) {
1277 dev_err(parent, "unable to register backlight device: %ld\n",
1278 PTR_ERR(bl));
1279 return NULL;
1280 }
1281
1282 bl->props.max_brightness = ch->cfg.bl_info.max_brightness;
1283 bl->props.brightness = bl->props.max_brightness;
1284 backlight_update_status(bl);
1285
1286 return bl;
1287 }
1288
1289 static void sh_mobile_lcdc_bl_remove(struct backlight_device *bdev)
1290 {
1291 backlight_device_unregister(bdev);
1292 }
1293
1294 static int sh_mobile_lcdc_suspend(struct device *dev)
1295 {
1296 struct platform_device *pdev = to_platform_device(dev);
1297
1298 sh_mobile_lcdc_stop(platform_get_drvdata(pdev));
1299 return 0;
1300 }
1301
1302 static int sh_mobile_lcdc_resume(struct device *dev)
1303 {
1304 struct platform_device *pdev = to_platform_device(dev);
1305
1306 return sh_mobile_lcdc_start(platform_get_drvdata(pdev));
1307 }
1308
1309 static int sh_mobile_lcdc_runtime_suspend(struct device *dev)
1310 {
1311 struct platform_device *pdev = to_platform_device(dev);
1312 struct sh_mobile_lcdc_priv *priv = platform_get_drvdata(pdev);
1313
1314 /* turn off LCDC hardware */
1315 lcdc_write(priv, _LDCNT1R, 0);
1316
1317 return 0;
1318 }
1319
1320 static int sh_mobile_lcdc_runtime_resume(struct device *dev)
1321 {
1322 struct platform_device *pdev = to_platform_device(dev);
1323 struct sh_mobile_lcdc_priv *priv = platform_get_drvdata(pdev);
1324
1325 __sh_mobile_lcdc_start(priv);
1326
1327 return 0;
1328 }
1329
1330 static const struct dev_pm_ops sh_mobile_lcdc_dev_pm_ops = {
1331 .suspend = sh_mobile_lcdc_suspend,
1332 .resume = sh_mobile_lcdc_resume,
1333 .runtime_suspend = sh_mobile_lcdc_runtime_suspend,
1334 .runtime_resume = sh_mobile_lcdc_runtime_resume,
1335 };
1336
1337 /* locking: called with info->lock held */
1338 static int sh_mobile_lcdc_notify(struct notifier_block *nb,
1339 unsigned long action, void *data)
1340 {
1341 struct fb_event *event = data;
1342 struct fb_info *info = event->info;
1343 struct sh_mobile_lcdc_chan *ch = info->par;
1344 struct sh_mobile_lcdc_board_cfg *board_cfg = &ch->cfg.board_cfg;
1345
1346 if (&ch->lcdc->notifier != nb)
1347 return NOTIFY_DONE;
1348
1349 dev_dbg(info->dev, "%s(): action = %lu, data = %p\n",
1350 __func__, action, event->data);
1351
1352 switch(action) {
1353 case FB_EVENT_SUSPEND:
1354 if (board_cfg->display_off && try_module_get(board_cfg->owner)) {
1355 board_cfg->display_off(board_cfg->board_data);
1356 module_put(board_cfg->owner);
1357 }
1358 sh_mobile_lcdc_stop(ch->lcdc);
1359 break;
1360 case FB_EVENT_RESUME:
1361 mutex_lock(&ch->open_lock);
1362 sh_mobile_fb_reconfig(info);
1363 mutex_unlock(&ch->open_lock);
1364
1365 /* HDMI must be enabled before LCDC configuration */
1366 if (board_cfg->display_on && try_module_get(board_cfg->owner)) {
1367 board_cfg->display_on(board_cfg->board_data, info);
1368 module_put(board_cfg->owner);
1369 }
1370
1371 sh_mobile_lcdc_start(ch->lcdc);
1372 }
1373
1374 return NOTIFY_OK;
1375 }
1376
1377 static int sh_mobile_lcdc_remove(struct platform_device *pdev)
1378 {
1379 struct sh_mobile_lcdc_priv *priv = platform_get_drvdata(pdev);
1380 struct fb_info *info;
1381 int i;
1382
1383 fb_unregister_client(&priv->notifier);
1384
1385 for (i = 0; i < ARRAY_SIZE(priv->ch); i++)
1386 if (priv->ch[i].info && priv->ch[i].info->dev)
1387 unregister_framebuffer(priv->ch[i].info);
1388
1389 sh_mobile_lcdc_stop(priv);
1390
1391 for (i = 0; i < ARRAY_SIZE(priv->ch); i++) {
1392 info = priv->ch[i].info;
1393
1394 if (!info || !info->device)
1395 continue;
1396
1397 if (priv->ch[i].sglist)
1398 vfree(priv->ch[i].sglist);
1399
1400 if (info->screen_base)
1401 dma_free_coherent(&pdev->dev, info->fix.smem_len,
1402 info->screen_base,
1403 priv->ch[i].dma_handle);
1404 fb_dealloc_cmap(&info->cmap);
1405 framebuffer_release(info);
1406 }
1407
1408 for (i = 0; i < ARRAY_SIZE(priv->ch); i++) {
1409 if (priv->ch[i].bl)
1410 sh_mobile_lcdc_bl_remove(priv->ch[i].bl);
1411 }
1412
1413 if (priv->dot_clk)
1414 clk_put(priv->dot_clk);
1415
1416 if (priv->dev)
1417 pm_runtime_disable(priv->dev);
1418
1419 if (priv->base)
1420 iounmap(priv->base);
1421
1422 if (priv->irq)
1423 free_irq(priv->irq, priv);
1424 kfree(priv);
1425 return 0;
1426 }
1427
1428 static int __devinit sh_mobile_lcdc_channel_init(struct sh_mobile_lcdc_chan *ch,
1429 struct device *dev)
1430 {
1431 struct sh_mobile_lcdc_chan_cfg *cfg = &ch->cfg;
1432 const struct fb_videomode *max_mode;
1433 const struct fb_videomode *mode;
1434 struct fb_var_screeninfo *var;
1435 struct fb_info *info;
1436 unsigned int max_size;
1437 int num_cfg;
1438 void *buf;
1439 int ret;
1440 int i;
1441
1442 mutex_init(&ch->open_lock);
1443
1444 /* Allocate the frame buffer device. */
1445 ch->info = framebuffer_alloc(0, dev);
1446 if (!ch->info) {
1447 dev_err(dev, "unable to allocate fb_info\n");
1448 return -ENOMEM;
1449 }
1450
1451 info = ch->info;
1452 info->fbops = &sh_mobile_lcdc_ops;
1453 info->par = ch;
1454 info->pseudo_palette = &ch->pseudo_palette;
1455 info->flags = FBINFO_FLAG_DEFAULT;
1456
1457 /* Iterate through the modes to validate them and find the highest
1458 * resolution.
1459 */
1460 max_mode = NULL;
1461 max_size = 0;
1462
1463 for (i = 0, mode = cfg->lcd_cfg; i < cfg->num_cfg; i++, mode++) {
1464 unsigned int size = mode->yres * mode->xres;
1465
1466 /* NV12 buffers must have even number of lines */
1467 if ((cfg->nonstd) && cfg->bpp == 12 &&
1468 (mode->yres & 0x1)) {
1469 dev_err(dev, "yres must be multiple of 2 for YCbCr420 "
1470 "mode.\n");
1471 return -EINVAL;
1472 }
1473
1474 if (size > max_size) {
1475 max_mode = mode;
1476 max_size = size;
1477 }
1478 }
1479
1480 if (!max_size)
1481 max_size = MAX_XRES * MAX_YRES;
1482 else
1483 dev_dbg(dev, "Found largest videomode %ux%u\n",
1484 max_mode->xres, max_mode->yres);
1485
1486 /* Initialize fixed screen information. Restrict pan to 2 lines steps
1487 * for NV12.
1488 */
1489 info->fix = sh_mobile_lcdc_fix;
1490 info->fix.smem_len = max_size * 2 * cfg->bpp / 8;
1491 if (cfg->nonstd && cfg->bpp == 12)
1492 info->fix.ypanstep = 2;
1493
1494 /* Create the mode list. */
1495 if (cfg->lcd_cfg == NULL) {
1496 mode = &default_720p;
1497 num_cfg = 1;
1498 } else {
1499 mode = cfg->lcd_cfg;
1500 num_cfg = cfg->num_cfg;
1501 }
1502
1503 fb_videomode_to_modelist(mode, num_cfg, &info->modelist);
1504
1505 /* Initialize variable screen information using the first mode as
1506 * default. The default Y virtual resolution is twice the panel size to
1507 * allow for double-buffering.
1508 */
1509 var = &info->var;
1510 fb_videomode_to_var(var, mode);
1511 var->bits_per_pixel = cfg->bpp;
1512 var->width = cfg->lcd_size_cfg.width;
1513 var->height = cfg->lcd_size_cfg.height;
1514 var->yres_virtual = var->yres * 2;
1515 var->activate = FB_ACTIVATE_NOW;
1516
1517 ret = sh_mobile_check_var(var, info);
1518 if (ret)
1519 return ret;
1520
1521 /* Allocate frame buffer memory and color map. */
1522 buf = dma_alloc_coherent(dev, info->fix.smem_len, &ch->dma_handle,
1523 GFP_KERNEL);
1524 if (!buf) {
1525 dev_err(dev, "unable to allocate buffer\n");
1526 return -ENOMEM;
1527 }
1528
1529 ret = fb_alloc_cmap(&info->cmap, PALETTE_NR, 0);
1530 if (ret < 0) {
1531 dev_err(dev, "unable to allocate cmap\n");
1532 dma_free_coherent(dev, info->fix.smem_len,
1533 buf, ch->dma_handle);
1534 return ret;
1535 }
1536
1537 info->fix.smem_start = ch->dma_handle;
1538 if (var->nonstd)
1539 info->fix.line_length = var->xres;
1540 else
1541 info->fix.line_length = var->xres * (cfg->bpp / 8);
1542
1543 info->screen_base = buf;
1544 info->device = dev;
1545 ch->display_var = *var;
1546
1547 return 0;
1548 }
1549
1550 static int __devinit sh_mobile_lcdc_probe(struct platform_device *pdev)
1551 {
1552 struct sh_mobile_lcdc_info *pdata = pdev->dev.platform_data;
1553 struct sh_mobile_lcdc_priv *priv;
1554 struct resource *res;
1555 int num_channels;
1556 int error;
1557 int i;
1558
1559 if (!pdata) {
1560 dev_err(&pdev->dev, "no platform data defined\n");
1561 return -EINVAL;
1562 }
1563
1564 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1565 i = platform_get_irq(pdev, 0);
1566 if (!res || i < 0) {
1567 dev_err(&pdev->dev, "cannot get platform resources\n");
1568 return -ENOENT;
1569 }
1570
1571 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1572 if (!priv) {
1573 dev_err(&pdev->dev, "cannot allocate device data\n");
1574 return -ENOMEM;
1575 }
1576
1577 platform_set_drvdata(pdev, priv);
1578
1579 error = request_irq(i, sh_mobile_lcdc_irq, 0,
1580 dev_name(&pdev->dev), priv);
1581 if (error) {
1582 dev_err(&pdev->dev, "unable to request irq\n");
1583 goto err1;
1584 }
1585
1586 priv->irq = i;
1587 atomic_set(&priv->hw_usecnt, -1);
1588
1589 for (i = 0, num_channels = 0; i < ARRAY_SIZE(pdata->ch); i++) {
1590 struct sh_mobile_lcdc_chan *ch = priv->ch + num_channels;
1591
1592 ch->lcdc = priv;
1593 memcpy(&ch->cfg, &pdata->ch[i], sizeof(pdata->ch[i]));
1594
1595 error = sh_mobile_lcdc_check_interface(ch);
1596 if (error) {
1597 dev_err(&pdev->dev, "unsupported interface type\n");
1598 goto err1;
1599 }
1600 init_waitqueue_head(&ch->frame_end_wait);
1601 init_completion(&ch->vsync_completion);
1602 ch->pan_offset = 0;
1603
1604 /* probe the backlight is there is one defined */
1605 if (ch->cfg.bl_info.max_brightness)
1606 ch->bl = sh_mobile_lcdc_bl_probe(&pdev->dev, ch);
1607
1608 switch (pdata->ch[i].chan) {
1609 case LCDC_CHAN_MAINLCD:
1610 ch->enabled = LDCNT2R_ME;
1611 ch->reg_offs = lcdc_offs_mainlcd;
1612 num_channels++;
1613 break;
1614 case LCDC_CHAN_SUBLCD:
1615 ch->enabled = LDCNT2R_SE;
1616 ch->reg_offs = lcdc_offs_sublcd;
1617 num_channels++;
1618 break;
1619 }
1620 }
1621
1622 if (!num_channels) {
1623 dev_err(&pdev->dev, "no channels defined\n");
1624 error = -EINVAL;
1625 goto err1;
1626 }
1627
1628 /* for dual channel LCDC (MAIN + SUB) force shared bpp setting */
1629 if (num_channels == 2)
1630 priv->forced_bpp = pdata->ch[0].bpp;
1631
1632 priv->base = ioremap_nocache(res->start, resource_size(res));
1633 if (!priv->base)
1634 goto err1;
1635
1636 error = sh_mobile_lcdc_setup_clocks(pdev, pdata->clock_source, priv);
1637 if (error) {
1638 dev_err(&pdev->dev, "unable to setup clocks\n");
1639 goto err1;
1640 }
1641
1642 priv->meram_dev = pdata->meram_dev;
1643
1644 for (i = 0; i < num_channels; i++) {
1645 struct sh_mobile_lcdc_chan *ch = priv->ch + i;
1646
1647 error = sh_mobile_lcdc_channel_init(ch, &pdev->dev);
1648 if (error)
1649 goto err1;
1650 }
1651
1652 error = sh_mobile_lcdc_start(priv);
1653 if (error) {
1654 dev_err(&pdev->dev, "unable to start hardware\n");
1655 goto err1;
1656 }
1657
1658 for (i = 0; i < num_channels; i++) {
1659 struct sh_mobile_lcdc_chan *ch = priv->ch + i;
1660 struct fb_info *info = ch->info;
1661
1662 if (info->fbdefio) {
1663 ch->sglist = vmalloc(sizeof(struct scatterlist) *
1664 info->fix.smem_len >> PAGE_SHIFT);
1665 if (!ch->sglist) {
1666 dev_err(&pdev->dev, "cannot allocate sglist\n");
1667 goto err1;
1668 }
1669 }
1670
1671 info->bl_dev = ch->bl;
1672
1673 error = register_framebuffer(info);
1674 if (error < 0)
1675 goto err1;
1676
1677 dev_info(info->dev,
1678 "registered %s/%s as %dx%d %dbpp.\n",
1679 pdev->name,
1680 (ch->cfg.chan == LCDC_CHAN_MAINLCD) ?
1681 "mainlcd" : "sublcd",
1682 info->var.xres, info->var.yres,
1683 ch->cfg.bpp);
1684
1685 /* deferred io mode: disable clock to save power */
1686 if (info->fbdefio || info->state == FBINFO_STATE_SUSPENDED)
1687 sh_mobile_lcdc_clk_off(priv);
1688 }
1689
1690 /* Failure ignored */
1691 priv->notifier.notifier_call = sh_mobile_lcdc_notify;
1692 fb_register_client(&priv->notifier);
1693
1694 return 0;
1695 err1:
1696 sh_mobile_lcdc_remove(pdev);
1697
1698 return error;
1699 }
1700
1701 static struct platform_driver sh_mobile_lcdc_driver = {
1702 .driver = {
1703 .name = "sh_mobile_lcdc_fb",
1704 .owner = THIS_MODULE,
1705 .pm = &sh_mobile_lcdc_dev_pm_ops,
1706 },
1707 .probe = sh_mobile_lcdc_probe,
1708 .remove = sh_mobile_lcdc_remove,
1709 };
1710
1711 static int __init sh_mobile_lcdc_init(void)
1712 {
1713 return platform_driver_register(&sh_mobile_lcdc_driver);
1714 }
1715
1716 static void __exit sh_mobile_lcdc_exit(void)
1717 {
1718 platform_driver_unregister(&sh_mobile_lcdc_driver);
1719 }
1720
1721 module_init(sh_mobile_lcdc_init);
1722 module_exit(sh_mobile_lcdc_exit);
1723
1724 MODULE_DESCRIPTION("SuperH Mobile LCDC Framebuffer driver");
1725 MODULE_AUTHOR("Magnus Damm <damm@opensource.se>");
1726 MODULE_LICENSE("GPL v2");
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