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