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Fix new incorrect error return from do_md_stop.
[linux-2.6/mini2440.git] / drivers / video / sh_mobile_lcdcfb.c
blob8f24564f77b05e9939b964bfd97862f5078a73cf
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/fb.h>
16 #include <linux/clk.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 <video/sh_mobile_lcdc.h>
22 #include <asm/atomic.h>
23
24 #define PALETTE_NR 16
25
26 struct sh_mobile_lcdc_priv;
27 struct sh_mobile_lcdc_chan {
28 struct sh_mobile_lcdc_priv *lcdc;
29 unsigned long *reg_offs;
30 unsigned long ldmt1r_value;
31 unsigned long enabled; /* ME and SE in LDCNT2R */
32 struct sh_mobile_lcdc_chan_cfg cfg;
33 u32 pseudo_palette[PALETTE_NR];
34 struct fb_info *info;
35 dma_addr_t dma_handle;
36 struct fb_deferred_io defio;
37 struct scatterlist *sglist;
38 unsigned long frame_end;
39 wait_queue_head_t frame_end_wait;
40 };
41
42 struct sh_mobile_lcdc_priv {
43 void __iomem *base;
44 int irq;
45 #ifdef CONFIG_HAVE_CLK
46 atomic_t clk_usecnt;
47 struct clk *dot_clk;
48 struct clk *clk;
49 #endif
50 unsigned long lddckr;
51 struct sh_mobile_lcdc_chan ch[2];
52 int started;
53 };
54
55 /* shared registers */
56 #define _LDDCKR 0x410
57 #define _LDDCKSTPR 0x414
58 #define _LDINTR 0x468
59 #define _LDSR 0x46c
60 #define _LDCNT1R 0x470
61 #define _LDCNT2R 0x474
62 #define _LDDDSR 0x47c
63 #define _LDDWD0R 0x800
64 #define _LDDRDR 0x840
65 #define _LDDWAR 0x900
66 #define _LDDRAR 0x904
67
68 /* per-channel registers */
69 enum { LDDCKPAT1R, LDDCKPAT2R, LDMT1R, LDMT2R, LDMT3R, LDDFR, LDSM1R,
70 LDSM2R, LDSA1R, LDMLSR, LDHCNR, LDHSYNR, LDVLNR, LDVSYNR, LDPMR };
71
72 static unsigned long lcdc_offs_mainlcd[] = {
73 [LDDCKPAT1R] = 0x400,
74 [LDDCKPAT2R] = 0x404,
75 [LDMT1R] = 0x418,
76 [LDMT2R] = 0x41c,
77 [LDMT3R] = 0x420,
78 [LDDFR] = 0x424,
79 [LDSM1R] = 0x428,
80 [LDSM2R] = 0x42c,
81 [LDSA1R] = 0x430,
82 [LDMLSR] = 0x438,
83 [LDHCNR] = 0x448,
84 [LDHSYNR] = 0x44c,
85 [LDVLNR] = 0x450,
86 [LDVSYNR] = 0x454,
87 [LDPMR] = 0x460,
88 };
89
90 static unsigned long lcdc_offs_sublcd[] = {
91 [LDDCKPAT1R] = 0x408,
92 [LDDCKPAT2R] = 0x40c,
93 [LDMT1R] = 0x600,
94 [LDMT2R] = 0x604,
95 [LDMT3R] = 0x608,
96 [LDDFR] = 0x60c,
97 [LDSM1R] = 0x610,
98 [LDSM2R] = 0x614,
99 [LDSA1R] = 0x618,
100 [LDMLSR] = 0x620,
101 [LDHCNR] = 0x624,
102 [LDHSYNR] = 0x628,
103 [LDVLNR] = 0x62c,
104 [LDVSYNR] = 0x630,
105 [LDPMR] = 0x63c,
106 };
107
108 #define START_LCDC 0x00000001
109 #define LCDC_RESET 0x00000100
110 #define DISPLAY_BEU 0x00000008
111 #define LCDC_ENABLE 0x00000001
112 #define LDINTR_FE 0x00000400
113 #define LDINTR_FS 0x00000004
114
115 static void lcdc_write_chan(struct sh_mobile_lcdc_chan *chan,
116 int reg_nr, unsigned long data)
117 {
118 iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr]);
119 }
120
121 static unsigned long lcdc_read_chan(struct sh_mobile_lcdc_chan *chan,
122 int reg_nr)
123 {
124 return ioread32(chan->lcdc->base + chan->reg_offs[reg_nr]);
125 }
126
127 static void lcdc_write(struct sh_mobile_lcdc_priv *priv,
128 unsigned long reg_offs, unsigned long data)
129 {
130 iowrite32(data, priv->base + reg_offs);
131 }
132
133 static unsigned long lcdc_read(struct sh_mobile_lcdc_priv *priv,
134 unsigned long reg_offs)
135 {
136 return ioread32(priv->base + reg_offs);
137 }
138
139 static void lcdc_wait_bit(struct sh_mobile_lcdc_priv *priv,
140 unsigned long reg_offs,
141 unsigned long mask, unsigned long until)
142 {
143 while ((lcdc_read(priv, reg_offs) & mask) != until)
144 cpu_relax();
145 }
146
147 static int lcdc_chan_is_sublcd(struct sh_mobile_lcdc_chan *chan)
148 {
149 return chan->cfg.chan == LCDC_CHAN_SUBLCD;
150 }
151
152 static void lcdc_sys_write_index(void *handle, unsigned long data)
153 {
154 struct sh_mobile_lcdc_chan *ch = handle;
155
156 lcdc_write(ch->lcdc, _LDDWD0R, data | 0x10000000);
157 lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
158 lcdc_write(ch->lcdc, _LDDWAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0));
159 }
160
161 static void lcdc_sys_write_data(void *handle, unsigned long data)
162 {
163 struct sh_mobile_lcdc_chan *ch = handle;
164
165 lcdc_write(ch->lcdc, _LDDWD0R, data | 0x11000000);
166 lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
167 lcdc_write(ch->lcdc, _LDDWAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0));
168 }
169
170 static unsigned long lcdc_sys_read_data(void *handle)
171 {
172 struct sh_mobile_lcdc_chan *ch = handle;
173
174 lcdc_write(ch->lcdc, _LDDRDR, 0x01000000);
175 lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
176 lcdc_write(ch->lcdc, _LDDRAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0));
177 udelay(1);
178
179 return lcdc_read(ch->lcdc, _LDDRDR) & 0xffff;
180 }
181
182 struct sh_mobile_lcdc_sys_bus_ops sh_mobile_lcdc_sys_bus_ops = {
183 lcdc_sys_write_index,
184 lcdc_sys_write_data,
185 lcdc_sys_read_data,
186 };
187
188 #ifdef CONFIG_HAVE_CLK
189 static void sh_mobile_lcdc_clk_on(struct sh_mobile_lcdc_priv *priv)
190 {
191 if (atomic_inc_and_test(&priv->clk_usecnt)) {
192 clk_enable(priv->clk);
193 if (priv->dot_clk)
194 clk_enable(priv->dot_clk);
195 }
196 }
197
198 static void sh_mobile_lcdc_clk_off(struct sh_mobile_lcdc_priv *priv)
199 {
200 if (atomic_sub_return(1, &priv->clk_usecnt) == -1) {
201 if (priv->dot_clk)
202 clk_disable(priv->dot_clk);
203 clk_disable(priv->clk);
204 }
205 }
206 #else
207 static void sh_mobile_lcdc_clk_on(struct sh_mobile_lcdc_priv *priv) {}
208 static void sh_mobile_lcdc_clk_off(struct sh_mobile_lcdc_priv *priv) {}
209 #endif
210
211 static int sh_mobile_lcdc_sginit(struct fb_info *info,
212 struct list_head *pagelist)
213 {
214 struct sh_mobile_lcdc_chan *ch = info->par;
215 unsigned int nr_pages_max = info->fix.smem_len >> PAGE_SHIFT;
216 struct page *page;
217 int nr_pages = 0;
218
219 sg_init_table(ch->sglist, nr_pages_max);
220
221 list_for_each_entry(page, pagelist, lru)
222 sg_set_page(&ch->sglist[nr_pages++], page, PAGE_SIZE, 0);
223
224 return nr_pages;
225 }
226
227 static void sh_mobile_lcdc_deferred_io(struct fb_info *info,
228 struct list_head *pagelist)
229 {
230 struct sh_mobile_lcdc_chan *ch = info->par;
231 unsigned int nr_pages;
232
233 /* enable clocks before accessing hardware */
234 sh_mobile_lcdc_clk_on(ch->lcdc);
235
236 nr_pages = sh_mobile_lcdc_sginit(info, pagelist);
237 dma_map_sg(info->dev, ch->sglist, nr_pages, DMA_TO_DEVICE);
238
239 /* trigger panel update */
240 lcdc_write_chan(ch, LDSM2R, 1);
241
242 dma_unmap_sg(info->dev, ch->sglist, nr_pages, DMA_TO_DEVICE);
243 }
244
245 static void sh_mobile_lcdc_deferred_io_touch(struct fb_info *info)
246 {
247 struct fb_deferred_io *fbdefio = info->fbdefio;
248
249 if (fbdefio)
250 schedule_delayed_work(&info->deferred_work, fbdefio->delay);
251 }
252
253 static irqreturn_t sh_mobile_lcdc_irq(int irq, void *data)
254 {
255 struct sh_mobile_lcdc_priv *priv = data;
256 struct sh_mobile_lcdc_chan *ch;
257 unsigned long tmp;
258 int is_sub;
259 int k;
260
261 /* acknowledge interrupt */
262 tmp = lcdc_read(priv, _LDINTR);
263 tmp &= 0xffffff00; /* mask in high 24 bits */
264 tmp |= 0x000000ff ^ LDINTR_FS; /* status in low 8 */
265 lcdc_write(priv, _LDINTR, tmp);
266
267 /* figure out if this interrupt is for main or sub lcd */
268 is_sub = (lcdc_read(priv, _LDSR) & (1 << 10)) ? 1 : 0;
269
270 /* wake up channel and disable clocks*/
271 for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
272 ch = &priv->ch[k];
273
274 if (!ch->enabled)
275 continue;
276
277 if (is_sub == lcdc_chan_is_sublcd(ch)) {
278 ch->frame_end = 1;
279 wake_up(&ch->frame_end_wait);
280
281 sh_mobile_lcdc_clk_off(priv);
282 }
283 }
284
285 return IRQ_HANDLED;
286 }
287
288 static void sh_mobile_lcdc_start_stop(struct sh_mobile_lcdc_priv *priv,
289 int start)
290 {
291 unsigned long tmp = lcdc_read(priv, _LDCNT2R);
292 int k;
293
294 /* start or stop the lcdc */
295 if (start)
296 lcdc_write(priv, _LDCNT2R, tmp | START_LCDC);
297 else
298 lcdc_write(priv, _LDCNT2R, tmp & ~START_LCDC);
299
300 /* wait until power is applied/stopped on all channels */
301 for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
302 if (lcdc_read(priv, _LDCNT2R) & priv->ch[k].enabled)
303 while (1) {
304 tmp = lcdc_read_chan(&priv->ch[k], LDPMR) & 3;
305 if (start && tmp == 3)
306 break;
307 if (!start && tmp == 0)
308 break;
309 cpu_relax();
310 }
311
312 if (!start)
313 lcdc_write(priv, _LDDCKSTPR, 1); /* stop dotclock */
314 }
315
316 static int sh_mobile_lcdc_start(struct sh_mobile_lcdc_priv *priv)
317 {
318 struct sh_mobile_lcdc_chan *ch;
319 struct fb_videomode *lcd_cfg;
320 struct sh_mobile_lcdc_board_cfg *board_cfg;
321 unsigned long tmp;
322 int k, m;
323 int ret = 0;
324
325 /* enable clocks before accessing the hardware */
326 for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
327 if (priv->ch[k].enabled)
328 sh_mobile_lcdc_clk_on(priv);
329
330 /* reset */
331 lcdc_write(priv, _LDCNT2R, lcdc_read(priv, _LDCNT2R) | LCDC_RESET);
332 lcdc_wait_bit(priv, _LDCNT2R, LCDC_RESET, 0);
333
334 /* enable LCDC channels */
335 tmp = lcdc_read(priv, _LDCNT2R);
336 tmp |= priv->ch[0].enabled;
337 tmp |= priv->ch[1].enabled;
338 lcdc_write(priv, _LDCNT2R, tmp);
339
340 /* read data from external memory, avoid using the BEU for now */
341 lcdc_write(priv, _LDCNT2R, lcdc_read(priv, _LDCNT2R) & ~DISPLAY_BEU);
342
343 /* stop the lcdc first */
344 sh_mobile_lcdc_start_stop(priv, 0);
345
346 /* configure clocks */
347 tmp = priv->lddckr;
348 for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
349 ch = &priv->ch[k];
350
351 if (!priv->ch[k].enabled)
352 continue;
353
354 m = ch->cfg.clock_divider;
355 if (!m)
356 continue;
357
358 if (m == 1)
359 m = 1 << 6;
360 tmp |= m << (lcdc_chan_is_sublcd(ch) ? 8 : 0);
361
362 lcdc_write_chan(ch, LDDCKPAT1R, 0x00000000);
363 lcdc_write_chan(ch, LDDCKPAT2R, (1 << (m/2)) - 1);
364 }
365
366 lcdc_write(priv, _LDDCKR, tmp);
367
368 /* start dotclock again */
369 lcdc_write(priv, _LDDCKSTPR, 0);
370 lcdc_wait_bit(priv, _LDDCKSTPR, ~0, 0);
371
372 /* interrupts are disabled to begin with */
373 lcdc_write(priv, _LDINTR, 0);
374
375 for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
376 ch = &priv->ch[k];
377 lcd_cfg = &ch->cfg.lcd_cfg;
378
379 if (!ch->enabled)
380 continue;
381
382 tmp = ch->ldmt1r_value;
383 tmp |= (lcd_cfg->sync & FB_SYNC_VERT_HIGH_ACT) ? 0 : 1 << 28;
384 tmp |= (lcd_cfg->sync & FB_SYNC_HOR_HIGH_ACT) ? 0 : 1 << 27;
385 tmp |= (ch->cfg.flags & LCDC_FLAGS_DWPOL) ? 1 << 26 : 0;
386 tmp |= (ch->cfg.flags & LCDC_FLAGS_DIPOL) ? 1 << 25 : 0;
387 tmp |= (ch->cfg.flags & LCDC_FLAGS_DAPOL) ? 1 << 24 : 0;
388 tmp |= (ch->cfg.flags & LCDC_FLAGS_HSCNT) ? 1 << 17 : 0;
389 tmp |= (ch->cfg.flags & LCDC_FLAGS_DWCNT) ? 1 << 16 : 0;
390 lcdc_write_chan(ch, LDMT1R, tmp);
391
392 /* setup SYS bus */
393 lcdc_write_chan(ch, LDMT2R, ch->cfg.sys_bus_cfg.ldmt2r);
394 lcdc_write_chan(ch, LDMT3R, ch->cfg.sys_bus_cfg.ldmt3r);
395
396 /* horizontal configuration */
397 tmp = lcd_cfg->xres + lcd_cfg->hsync_len;
398 tmp += lcd_cfg->left_margin;
399 tmp += lcd_cfg->right_margin;
400 tmp /= 8; /* HTCN */
401 tmp |= (lcd_cfg->xres / 8) << 16; /* HDCN */
402 lcdc_write_chan(ch, LDHCNR, tmp);
403
404 tmp = lcd_cfg->xres;
405 tmp += lcd_cfg->right_margin;
406 tmp /= 8; /* HSYNP */
407 tmp |= (lcd_cfg->hsync_len / 8) << 16; /* HSYNW */
408 lcdc_write_chan(ch, LDHSYNR, tmp);
409
410 /* power supply */
411 lcdc_write_chan(ch, LDPMR, 0);
412
413 /* vertical configuration */
414 tmp = lcd_cfg->yres + lcd_cfg->vsync_len;
415 tmp += lcd_cfg->upper_margin;
416 tmp += lcd_cfg->lower_margin; /* VTLN */
417 tmp |= lcd_cfg->yres << 16; /* VDLN */
418 lcdc_write_chan(ch, LDVLNR, tmp);
419
420 tmp = lcd_cfg->yres;
421 tmp += lcd_cfg->lower_margin; /* VSYNP */
422 tmp |= lcd_cfg->vsync_len << 16; /* VSYNW */
423 lcdc_write_chan(ch, LDVSYNR, tmp);
424
425 board_cfg = &ch->cfg.board_cfg;
426 if (board_cfg->setup_sys)
427 ret = board_cfg->setup_sys(board_cfg->board_data, ch,
428 &sh_mobile_lcdc_sys_bus_ops);
429 if (ret)
430 return ret;
431 }
432
433 /* word and long word swap */
434 lcdc_write(priv, _LDDDSR, lcdc_read(priv, _LDDDSR) | 6);
435
436 for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
437 ch = &priv->ch[k];
438
439 if (!priv->ch[k].enabled)
440 continue;
441
442 /* set bpp format in PKF[4:0] */
443 tmp = lcdc_read_chan(ch, LDDFR);
444 tmp &= ~(0x0001001f);
445 tmp |= (ch->info->var.bits_per_pixel == 16) ? 3 : 0;
446 lcdc_write_chan(ch, LDDFR, tmp);
447
448 /* point out our frame buffer */
449 lcdc_write_chan(ch, LDSA1R, ch->info->fix.smem_start);
450
451 /* set line size */
452 lcdc_write_chan(ch, LDMLSR, ch->info->fix.line_length);
453
454 /* setup deferred io if SYS bus */
455 tmp = ch->cfg.sys_bus_cfg.deferred_io_msec;
456 if (ch->ldmt1r_value & (1 << 12) && tmp) {
457 ch->defio.deferred_io = sh_mobile_lcdc_deferred_io;
458 ch->defio.delay = msecs_to_jiffies(tmp);
459 ch->info->fbdefio = &ch->defio;
460 fb_deferred_io_init(ch->info);
461
462 /* one-shot mode */
463 lcdc_write_chan(ch, LDSM1R, 1);
464
465 /* enable "Frame End Interrupt Enable" bit */
466 lcdc_write(priv, _LDINTR, LDINTR_FE);
467
468 } else {
469 /* continuous read mode */
470 lcdc_write_chan(ch, LDSM1R, 0);
471 }
472 }
473
474 /* display output */
475 lcdc_write(priv, _LDCNT1R, LCDC_ENABLE);
476
477 /* start the lcdc */
478 sh_mobile_lcdc_start_stop(priv, 1);
479 priv->started = 1;
480
481 /* tell the board code to enable the panel */
482 for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
483 ch = &priv->ch[k];
484 board_cfg = &ch->cfg.board_cfg;
485 if (board_cfg->display_on)
486 board_cfg->display_on(board_cfg->board_data);
487 }
488
489 return 0;
490 }
491
492 static void sh_mobile_lcdc_stop(struct sh_mobile_lcdc_priv *priv)
493 {
494 struct sh_mobile_lcdc_chan *ch;
495 struct sh_mobile_lcdc_board_cfg *board_cfg;
496 int k;
497
498 /* clean up deferred io and ask board code to disable panel */
499 for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
500 ch = &priv->ch[k];
501
502 /* deferred io mode:
503 * flush frame, and wait for frame end interrupt
504 * clean up deferred io and enable clock
505 */
506 if (ch->info->fbdefio) {
507 ch->frame_end = 0;
508 schedule_delayed_work(&ch->info->deferred_work, 0);
509 wait_event(ch->frame_end_wait, ch->frame_end);
510 fb_deferred_io_cleanup(ch->info);
511 ch->info->fbdefio = NULL;
512 sh_mobile_lcdc_clk_on(priv);
513 }
514
515 board_cfg = &ch->cfg.board_cfg;
516 if (board_cfg->display_off)
517 board_cfg->display_off(board_cfg->board_data);
518
519 }
520
521 /* stop the lcdc */
522 if (priv->started) {
523 sh_mobile_lcdc_start_stop(priv, 0);
524 priv->started = 0;
525 }
526
527 /* stop clocks */
528 for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
529 if (priv->ch[k].enabled)
530 sh_mobile_lcdc_clk_off(priv);
531 }
532
533 static int sh_mobile_lcdc_check_interface(struct sh_mobile_lcdc_chan *ch)
534 {
535 int ifm, miftyp;
536
537 switch (ch->cfg.interface_type) {
538 case RGB8: ifm = 0; miftyp = 0; break;
539 case RGB9: ifm = 0; miftyp = 4; break;
540 case RGB12A: ifm = 0; miftyp = 5; break;
541 case RGB12B: ifm = 0; miftyp = 6; break;
542 case RGB16: ifm = 0; miftyp = 7; break;
543 case RGB18: ifm = 0; miftyp = 10; break;
544 case RGB24: ifm = 0; miftyp = 11; break;
545 case SYS8A: ifm = 1; miftyp = 0; break;
546 case SYS8B: ifm = 1; miftyp = 1; break;
547 case SYS8C: ifm = 1; miftyp = 2; break;
548 case SYS8D: ifm = 1; miftyp = 3; break;
549 case SYS9: ifm = 1; miftyp = 4; break;
550 case SYS12: ifm = 1; miftyp = 5; break;
551 case SYS16A: ifm = 1; miftyp = 7; break;
552 case SYS16B: ifm = 1; miftyp = 8; break;
553 case SYS16C: ifm = 1; miftyp = 9; break;
554 case SYS18: ifm = 1; miftyp = 10; break;
555 case SYS24: ifm = 1; miftyp = 11; break;
556 default: goto bad;
557 }
558
559 /* SUBLCD only supports SYS interface */
560 if (lcdc_chan_is_sublcd(ch)) {
561 if (ifm == 0)
562 goto bad;
563 else
564 ifm = 0;
565 }
566
567 ch->ldmt1r_value = (ifm << 12) | miftyp;
568 return 0;
569 bad:
570 return -EINVAL;
571 }
572
573 static int sh_mobile_lcdc_setup_clocks(struct platform_device *pdev,
574 int clock_source,
575 struct sh_mobile_lcdc_priv *priv)
576 {
577 #ifdef CONFIG_HAVE_CLK
578 char clk_name[8];
579 #endif
580 char *str;
581 int icksel;
582
583 switch (clock_source) {
584 case LCDC_CLK_BUS: str = "bus_clk"; icksel = 0; break;
585 case LCDC_CLK_PERIPHERAL: str = "peripheral_clk"; icksel = 1; break;
586 case LCDC_CLK_EXTERNAL: str = NULL; icksel = 2; break;
587 default:
588 return -EINVAL;
589 }
590
591 priv->lddckr = icksel << 16;
592
593 #ifdef CONFIG_HAVE_CLK
594 atomic_set(&priv->clk_usecnt, -1);
595 snprintf(clk_name, sizeof(clk_name), "lcdc%d", pdev->id);
596 priv->clk = clk_get(&pdev->dev, clk_name);
597 if (IS_ERR(priv->clk)) {
598 dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
599 return PTR_ERR(priv->clk);
600 }
601
602 if (str) {
603 priv->dot_clk = clk_get(&pdev->dev, str);
604 if (IS_ERR(priv->dot_clk)) {
605 dev_err(&pdev->dev, "cannot get dot clock %s\n", str);
606 clk_put(priv->clk);
607 return PTR_ERR(priv->dot_clk);
608 }
609 }
610 #endif
611
612 return 0;
613 }
614
615 static int sh_mobile_lcdc_setcolreg(u_int regno,
616 u_int red, u_int green, u_int blue,
617 u_int transp, struct fb_info *info)
618 {
619 u32 *palette = info->pseudo_palette;
620
621 if (regno >= PALETTE_NR)
622 return -EINVAL;
623
624 /* only FB_VISUAL_TRUECOLOR supported */
625
626 red >>= 16 - info->var.red.length;
627 green >>= 16 - info->var.green.length;
628 blue >>= 16 - info->var.blue.length;
629 transp >>= 16 - info->var.transp.length;
630
631 palette[regno] = (red << info->var.red.offset) |
632 (green << info->var.green.offset) |
633 (blue << info->var.blue.offset) |
634 (transp << info->var.transp.offset);
635
636 return 0;
637 }
638
639 static struct fb_fix_screeninfo sh_mobile_lcdc_fix = {
640 .id = "SH Mobile LCDC",
641 .type = FB_TYPE_PACKED_PIXELS,
642 .visual = FB_VISUAL_TRUECOLOR,
643 .accel = FB_ACCEL_NONE,
644 };
645
646 static void sh_mobile_lcdc_fillrect(struct fb_info *info,
647 const struct fb_fillrect *rect)
648 {
649 sys_fillrect(info, rect);
650 sh_mobile_lcdc_deferred_io_touch(info);
651 }
652
653 static void sh_mobile_lcdc_copyarea(struct fb_info *info,
654 const struct fb_copyarea *area)
655 {
656 sys_copyarea(info, area);
657 sh_mobile_lcdc_deferred_io_touch(info);
658 }
659
660 static void sh_mobile_lcdc_imageblit(struct fb_info *info,
661 const struct fb_image *image)
662 {
663 sys_imageblit(info, image);
664 sh_mobile_lcdc_deferred_io_touch(info);
665 }
666
667 static struct fb_ops sh_mobile_lcdc_ops = {
668 .fb_setcolreg = sh_mobile_lcdc_setcolreg,
669 .fb_read = fb_sys_read,
670 .fb_write = fb_sys_write,
671 .fb_fillrect = sh_mobile_lcdc_fillrect,
672 .fb_copyarea = sh_mobile_lcdc_copyarea,
673 .fb_imageblit = sh_mobile_lcdc_imageblit,
674 };
675
676 static int sh_mobile_lcdc_set_bpp(struct fb_var_screeninfo *var, int bpp)
677 {
678 switch (bpp) {
679 case 16: /* PKF[4:0] = 00011 - RGB 565 */
680 var->red.offset = 11;
681 var->red.length = 5;
682 var->green.offset = 5;
683 var->green.length = 6;
684 var->blue.offset = 0;
685 var->blue.length = 5;
686 var->transp.offset = 0;
687 var->transp.length = 0;
688 break;
689
690 case 32: /* PKF[4:0] = 00000 - RGB 888
691 * sh7722 pdf says 00RRGGBB but reality is GGBB00RR
692 * this may be because LDDDSR has word swap enabled..
693 */
694 var->red.offset = 0;
695 var->red.length = 8;
696 var->green.offset = 24;
697 var->green.length = 8;
698 var->blue.offset = 16;
699 var->blue.length = 8;
700 var->transp.offset = 0;
701 var->transp.length = 0;
702 break;
703 default:
704 return -EINVAL;
705 }
706 var->bits_per_pixel = bpp;
707 var->red.msb_right = 0;
708 var->green.msb_right = 0;
709 var->blue.msb_right = 0;
710 var->transp.msb_right = 0;
711 return 0;
712 }
713
714 static int sh_mobile_lcdc_suspend(struct device *dev)
715 {
716 struct platform_device *pdev = to_platform_device(dev);
717
718 sh_mobile_lcdc_stop(platform_get_drvdata(pdev));
719 return 0;
720 }
721
722 static int sh_mobile_lcdc_resume(struct device *dev)
723 {
724 struct platform_device *pdev = to_platform_device(dev);
725
726 return sh_mobile_lcdc_start(platform_get_drvdata(pdev));
727 }
728
729 static struct dev_pm_ops sh_mobile_lcdc_dev_pm_ops = {
730 .suspend = sh_mobile_lcdc_suspend,
731 .resume = sh_mobile_lcdc_resume,
732 };
733
734 static int sh_mobile_lcdc_remove(struct platform_device *pdev);
735
736 static int __init sh_mobile_lcdc_probe(struct platform_device *pdev)
737 {
738 struct fb_info *info;
739 struct sh_mobile_lcdc_priv *priv;
740 struct sh_mobile_lcdc_info *pdata;
741 struct sh_mobile_lcdc_chan_cfg *cfg;
742 struct resource *res;
743 int error;
744 void *buf;
745 int i, j;
746
747 if (!pdev->dev.platform_data) {
748 dev_err(&pdev->dev, "no platform data defined\n");
749 error = -EINVAL;
750 goto err0;
751 }
752
753 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
754 i = platform_get_irq(pdev, 0);
755 if (!res || i < 0) {
756 dev_err(&pdev->dev, "cannot get platform resources\n");
757 error = -ENOENT;
758 goto err0;
759 }
760
761 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
762 if (!priv) {
763 dev_err(&pdev->dev, "cannot allocate device data\n");
764 error = -ENOMEM;
765 goto err0;
766 }
767
768 error = request_irq(i, sh_mobile_lcdc_irq, IRQF_DISABLED,
769 dev_name(&pdev->dev), priv);
770 if (error) {
771 dev_err(&pdev->dev, "unable to request irq\n");
772 goto err1;
773 }
774
775 priv->irq = i;
776 platform_set_drvdata(pdev, priv);
777 pdata = pdev->dev.platform_data;
778
779 j = 0;
780 for (i = 0; i < ARRAY_SIZE(pdata->ch); i++) {
781 priv->ch[j].lcdc = priv;
782 memcpy(&priv->ch[j].cfg, &pdata->ch[i], sizeof(pdata->ch[i]));
783
784 error = sh_mobile_lcdc_check_interface(&priv->ch[i]);
785 if (error) {
786 dev_err(&pdev->dev, "unsupported interface type\n");
787 goto err1;
788 }
789 init_waitqueue_head(&priv->ch[i].frame_end_wait);
790
791 switch (pdata->ch[i].chan) {
792 case LCDC_CHAN_MAINLCD:
793 priv->ch[j].enabled = 1 << 1;
794 priv->ch[j].reg_offs = lcdc_offs_mainlcd;
795 j++;
796 break;
797 case LCDC_CHAN_SUBLCD:
798 priv->ch[j].enabled = 1 << 2;
799 priv->ch[j].reg_offs = lcdc_offs_sublcd;
800 j++;
801 break;
802 }
803 }
804
805 if (!j) {
806 dev_err(&pdev->dev, "no channels defined\n");
807 error = -EINVAL;
808 goto err1;
809 }
810
811 error = sh_mobile_lcdc_setup_clocks(pdev, pdata->clock_source, priv);
812 if (error) {
813 dev_err(&pdev->dev, "unable to setup clocks\n");
814 goto err1;
815 }
816
817 priv->base = ioremap_nocache(res->start, (res->end - res->start) + 1);
818
819 for (i = 0; i < j; i++) {
820 cfg = &priv->ch[i].cfg;
821
822 priv->ch[i].info = framebuffer_alloc(0, &pdev->dev);
823 if (!priv->ch[i].info) {
824 dev_err(&pdev->dev, "unable to allocate fb_info\n");
825 error = -ENOMEM;
826 break;
827 }
828
829 info = priv->ch[i].info;
830 info->fbops = &sh_mobile_lcdc_ops;
831 info->var.xres = info->var.xres_virtual = cfg->lcd_cfg.xres;
832 info->var.yres = info->var.yres_virtual = cfg->lcd_cfg.yres;
833 info->var.width = cfg->lcd_size_cfg.width;
834 info->var.height = cfg->lcd_size_cfg.height;
835 info->var.activate = FB_ACTIVATE_NOW;
836 error = sh_mobile_lcdc_set_bpp(&info->var, cfg->bpp);
837 if (error)
838 break;
839
840 info->fix = sh_mobile_lcdc_fix;
841 info->fix.line_length = cfg->lcd_cfg.xres * (cfg->bpp / 8);
842 info->fix.smem_len = info->fix.line_length * cfg->lcd_cfg.yres;
843
844 buf = dma_alloc_coherent(&pdev->dev, info->fix.smem_len,
845 &priv->ch[i].dma_handle, GFP_KERNEL);
846 if (!buf) {
847 dev_err(&pdev->dev, "unable to allocate buffer\n");
848 error = -ENOMEM;
849 break;
850 }
851
852 info->pseudo_palette = &priv->ch[i].pseudo_palette;
853 info->flags = FBINFO_FLAG_DEFAULT;
854
855 error = fb_alloc_cmap(&info->cmap, PALETTE_NR, 0);
856 if (error < 0) {
857 dev_err(&pdev->dev, "unable to allocate cmap\n");
858 dma_free_coherent(&pdev->dev, info->fix.smem_len,
859 buf, priv->ch[i].dma_handle);
860 break;
861 }
862
863 memset(buf, 0, info->fix.smem_len);
864 info->fix.smem_start = priv->ch[i].dma_handle;
865 info->screen_base = buf;
866 info->device = &pdev->dev;
867 info->par = &priv->ch[i];
868 }
869
870 if (error)
871 goto err1;
872
873 error = sh_mobile_lcdc_start(priv);
874 if (error) {
875 dev_err(&pdev->dev, "unable to start hardware\n");
876 goto err1;
877 }
878
879 for (i = 0; i < j; i++) {
880 struct sh_mobile_lcdc_chan *ch = priv->ch + i;
881
882 info = ch->info;
883
884 if (info->fbdefio) {
885 priv->ch->sglist = vmalloc(sizeof(struct scatterlist) *
886 info->fix.smem_len >> PAGE_SHIFT);
887 if (!priv->ch->sglist) {
888 dev_err(&pdev->dev, "cannot allocate sglist\n");
889 goto err1;
890 }
891 }
892
893 error = register_framebuffer(info);
894 if (error < 0)
895 goto err1;
896
897 dev_info(info->dev,
898 "registered %s/%s as %dx%d %dbpp.\n",
899 pdev->name,
900 (ch->cfg.chan == LCDC_CHAN_MAINLCD) ?
901 "mainlcd" : "sublcd",
902 (int) ch->cfg.lcd_cfg.xres,
903 (int) ch->cfg.lcd_cfg.yres,
904 ch->cfg.bpp);
905
906 /* deferred io mode: disable clock to save power */
907 if (info->fbdefio)
908 sh_mobile_lcdc_clk_off(priv);
909 }
910
911 return 0;
912 err1:
913 sh_mobile_lcdc_remove(pdev);
914 err0:
915 return error;
916 }
917
918 static int sh_mobile_lcdc_remove(struct platform_device *pdev)
919 {
920 struct sh_mobile_lcdc_priv *priv = platform_get_drvdata(pdev);
921 struct fb_info *info;
922 int i;
923
924 for (i = 0; i < ARRAY_SIZE(priv->ch); i++)
925 if (priv->ch[i].info->dev)
926 unregister_framebuffer(priv->ch[i].info);
927
928 sh_mobile_lcdc_stop(priv);
929
930 for (i = 0; i < ARRAY_SIZE(priv->ch); i++) {
931 info = priv->ch[i].info;
932
933 if (!info || !info->device)
934 continue;
935
936 if (priv->ch[i].sglist)
937 vfree(priv->ch[i].sglist);
938
939 dma_free_coherent(&pdev->dev, info->fix.smem_len,
940 info->screen_base, priv->ch[i].dma_handle);
941 fb_dealloc_cmap(&info->cmap);
942 framebuffer_release(info);
943 }
944
945 #ifdef CONFIG_HAVE_CLK
946 if (priv->dot_clk)
947 clk_put(priv->dot_clk);
948 clk_put(priv->clk);
949 #endif
950
951 if (priv->base)
952 iounmap(priv->base);
953
954 if (priv->irq)
955 free_irq(priv->irq, priv);
956 kfree(priv);
957 return 0;
958 }
959
960 static struct platform_driver sh_mobile_lcdc_driver = {
961 .driver = {
962 .name = "sh_mobile_lcdc_fb",
963 .owner = THIS_MODULE,
964 .pm = &sh_mobile_lcdc_dev_pm_ops,
965 },
966 .probe = sh_mobile_lcdc_probe,
967 .remove = sh_mobile_lcdc_remove,
968 };
969
970 static int __init sh_mobile_lcdc_init(void)
971 {
972 return platform_driver_register(&sh_mobile_lcdc_driver);
973 }
974
975 static void __exit sh_mobile_lcdc_exit(void)
976 {
977 platform_driver_unregister(&sh_mobile_lcdc_driver);
978 }
979
980 module_init(sh_mobile_lcdc_init);
981 module_exit(sh_mobile_lcdc_exit);
982
983 MODULE_DESCRIPTION("SuperH Mobile LCDC Framebuffer driver");
984 MODULE_AUTHOR("Magnus Damm <damm@opensource.se>");
985 MODULE_LICENSE("GPL v2");
Support for the Chinese Samsung S3C2440 based development boards