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x86/amd-iommu: Add per IOMMU reference counting
[linux/fpc-iii.git] / drivers / video / sh_mobile_lcdcfb.c
blob3ad5157f9899f766e2a272668c148d73006cb000
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/pm_runtime.h>
18 #include <linux/platform_device.h>
19 #include <linux/dma-mapping.h>
20 #include <linux/interrupt.h>
21 #include <linux/vmalloc.h>
22 #include <video/sh_mobile_lcdc.h>
23 #include <asm/atomic.h>
24
25 #define PALETTE_NR 16
26 #define SIDE_B_OFFSET 0x1000
27 #define MIRROR_OFFSET 0x2000
28
29 /* shared registers */
30 #define _LDDCKR 0x410
31 #define _LDDCKSTPR 0x414
32 #define _LDINTR 0x468
33 #define _LDSR 0x46c
34 #define _LDCNT1R 0x470
35 #define _LDCNT2R 0x474
36 #define _LDRCNTR 0x478
37 #define _LDDDSR 0x47c
38 #define _LDDWD0R 0x800
39 #define _LDDRDR 0x840
40 #define _LDDWAR 0x900
41 #define _LDDRAR 0x904
42
43 /* shared registers and their order for context save/restore */
44 static int lcdc_shared_regs[] = {
45 _LDDCKR,
46 _LDDCKSTPR,
47 _LDINTR,
48 _LDDDSR,
49 _LDCNT1R,
50 _LDCNT2R,
51 };
52 #define NR_SHARED_REGS ARRAY_SIZE(lcdc_shared_regs)
53
54 /* per-channel registers */
55 enum { LDDCKPAT1R, LDDCKPAT2R, LDMT1R, LDMT2R, LDMT3R, LDDFR, LDSM1R,
56 LDSM2R, LDSA1R, LDMLSR, LDHCNR, LDHSYNR, LDVLNR, LDVSYNR, LDPMR,
57 NR_CH_REGS };
58
59 static unsigned long lcdc_offs_mainlcd[NR_CH_REGS] = {
60 [LDDCKPAT1R] = 0x400,
61 [LDDCKPAT2R] = 0x404,
62 [LDMT1R] = 0x418,
63 [LDMT2R] = 0x41c,
64 [LDMT3R] = 0x420,
65 [LDDFR] = 0x424,
66 [LDSM1R] = 0x428,
67 [LDSM2R] = 0x42c,
68 [LDSA1R] = 0x430,
69 [LDMLSR] = 0x438,
70 [LDHCNR] = 0x448,
71 [LDHSYNR] = 0x44c,
72 [LDVLNR] = 0x450,
73 [LDVSYNR] = 0x454,
74 [LDPMR] = 0x460,
75 };
76
77 static unsigned long lcdc_offs_sublcd[NR_CH_REGS] = {
78 [LDDCKPAT1R] = 0x408,
79 [LDDCKPAT2R] = 0x40c,
80 [LDMT1R] = 0x600,
81 [LDMT2R] = 0x604,
82 [LDMT3R] = 0x608,
83 [LDDFR] = 0x60c,
84 [LDSM1R] = 0x610,
85 [LDSM2R] = 0x614,
86 [LDSA1R] = 0x618,
87 [LDMLSR] = 0x620,
88 [LDHCNR] = 0x624,
89 [LDHSYNR] = 0x628,
90 [LDVLNR] = 0x62c,
91 [LDVSYNR] = 0x630,
92 [LDPMR] = 0x63c,
93 };
94
95 #define START_LCDC 0x00000001
96 #define LCDC_RESET 0x00000100
97 #define DISPLAY_BEU 0x00000008
98 #define LCDC_ENABLE 0x00000001
99 #define LDINTR_FE 0x00000400
100 #define LDINTR_VSE 0x00000200
101 #define LDINTR_VEE 0x00000100
102 #define LDINTR_FS 0x00000004
103 #define LDINTR_VSS 0x00000002
104 #define LDINTR_VES 0x00000001
105 #define LDRCNTR_SRS 0x00020000
106 #define LDRCNTR_SRC 0x00010000
107 #define LDRCNTR_MRS 0x00000002
108 #define LDRCNTR_MRC 0x00000001
109
110 struct sh_mobile_lcdc_priv;
111 struct sh_mobile_lcdc_chan {
112 struct sh_mobile_lcdc_priv *lcdc;
113 unsigned long *reg_offs;
114 unsigned long ldmt1r_value;
115 unsigned long enabled; /* ME and SE in LDCNT2R */
116 struct sh_mobile_lcdc_chan_cfg cfg;
117 u32 pseudo_palette[PALETTE_NR];
118 unsigned long saved_ch_regs[NR_CH_REGS];
119 struct fb_info *info;
120 dma_addr_t dma_handle;
121 struct fb_deferred_io defio;
122 struct scatterlist *sglist;
123 unsigned long frame_end;
124 unsigned long pan_offset;
125 unsigned long new_pan_offset;
126 wait_queue_head_t frame_end_wait;
127 };
128
129 struct sh_mobile_lcdc_priv {
130 void __iomem *base;
131 int irq;
132 atomic_t hw_usecnt;
133 struct device *dev;
134 struct clk *dot_clk;
135 unsigned long lddckr;
136 struct sh_mobile_lcdc_chan ch[2];
137 unsigned long saved_shared_regs[NR_SHARED_REGS];
138 int started;
139 };
140
141 static bool banked(int reg_nr)
142 {
143 switch (reg_nr) {
144 case LDMT1R:
145 case LDMT2R:
146 case LDMT3R:
147 case LDDFR:
148 case LDSM1R:
149 case LDSA1R:
150 case LDMLSR:
151 case LDHCNR:
152 case LDHSYNR:
153 case LDVLNR:
154 case LDVSYNR:
155 return true;
156 }
157 return false;
158 }
159
160 static void lcdc_write_chan(struct sh_mobile_lcdc_chan *chan,
161 int reg_nr, unsigned long data)
162 {
163 iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr]);
164 if (banked(reg_nr))
165 iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr] +
166 SIDE_B_OFFSET);
167 }
168
169 static void lcdc_write_chan_mirror(struct sh_mobile_lcdc_chan *chan,
170 int reg_nr, unsigned long data)
171 {
172 iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr] +
173 MIRROR_OFFSET);
174 }
175
176 static unsigned long lcdc_read_chan(struct sh_mobile_lcdc_chan *chan,
177 int reg_nr)
178 {
179 return ioread32(chan->lcdc->base + chan->reg_offs[reg_nr]);
180 }
181
182 static void lcdc_write(struct sh_mobile_lcdc_priv *priv,
183 unsigned long reg_offs, unsigned long data)
184 {
185 iowrite32(data, priv->base + reg_offs);
186 }
187
188 static unsigned long lcdc_read(struct sh_mobile_lcdc_priv *priv,
189 unsigned long reg_offs)
190 {
191 return ioread32(priv->base + reg_offs);
192 }
193
194 static void lcdc_wait_bit(struct sh_mobile_lcdc_priv *priv,
195 unsigned long reg_offs,
196 unsigned long mask, unsigned long until)
197 {
198 while ((lcdc_read(priv, reg_offs) & mask) != until)
199 cpu_relax();
200 }
201
202 static int lcdc_chan_is_sublcd(struct sh_mobile_lcdc_chan *chan)
203 {
204 return chan->cfg.chan == LCDC_CHAN_SUBLCD;
205 }
206
207 static void lcdc_sys_write_index(void *handle, unsigned long data)
208 {
209 struct sh_mobile_lcdc_chan *ch = handle;
210
211 lcdc_write(ch->lcdc, _LDDWD0R, data | 0x10000000);
212 lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
213 lcdc_write(ch->lcdc, _LDDWAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0));
214 lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
215 }
216
217 static void lcdc_sys_write_data(void *handle, unsigned long data)
218 {
219 struct sh_mobile_lcdc_chan *ch = handle;
220
221 lcdc_write(ch->lcdc, _LDDWD0R, data | 0x11000000);
222 lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
223 lcdc_write(ch->lcdc, _LDDWAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0));
224 lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
225 }
226
227 static unsigned long lcdc_sys_read_data(void *handle)
228 {
229 struct sh_mobile_lcdc_chan *ch = handle;
230
231 lcdc_write(ch->lcdc, _LDDRDR, 0x01000000);
232 lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
233 lcdc_write(ch->lcdc, _LDDRAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0));
234 udelay(1);
235 lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
236
237 return lcdc_read(ch->lcdc, _LDDRDR) & 0x3ffff;
238 }
239
240 struct sh_mobile_lcdc_sys_bus_ops sh_mobile_lcdc_sys_bus_ops = {
241 lcdc_sys_write_index,
242 lcdc_sys_write_data,
243 lcdc_sys_read_data,
244 };
245
246 static void sh_mobile_lcdc_clk_on(struct sh_mobile_lcdc_priv *priv)
247 {
248 if (atomic_inc_and_test(&priv->hw_usecnt)) {
249 pm_runtime_get_sync(priv->dev);
250 if (priv->dot_clk)
251 clk_enable(priv->dot_clk);
252 }
253 }
254
255 static void sh_mobile_lcdc_clk_off(struct sh_mobile_lcdc_priv *priv)
256 {
257 if (atomic_sub_return(1, &priv->hw_usecnt) == -1) {
258 if (priv->dot_clk)
259 clk_disable(priv->dot_clk);
260 pm_runtime_put(priv->dev);
261 }
262 }
263
264 static int sh_mobile_lcdc_sginit(struct fb_info *info,
265 struct list_head *pagelist)
266 {
267 struct sh_mobile_lcdc_chan *ch = info->par;
268 unsigned int nr_pages_max = info->fix.smem_len >> PAGE_SHIFT;
269 struct page *page;
270 int nr_pages = 0;
271
272 sg_init_table(ch->sglist, nr_pages_max);
273
274 list_for_each_entry(page, pagelist, lru)
275 sg_set_page(&ch->sglist[nr_pages++], page, PAGE_SIZE, 0);
276
277 return nr_pages;
278 }
279
280 static void sh_mobile_lcdc_deferred_io(struct fb_info *info,
281 struct list_head *pagelist)
282 {
283 struct sh_mobile_lcdc_chan *ch = info->par;
284 unsigned int nr_pages;
285
286 /* enable clocks before accessing hardware */
287 sh_mobile_lcdc_clk_on(ch->lcdc);
288
289 nr_pages = sh_mobile_lcdc_sginit(info, pagelist);
290 dma_map_sg(info->dev, ch->sglist, nr_pages, DMA_TO_DEVICE);
291
292 /* trigger panel update */
293 lcdc_write_chan(ch, LDSM2R, 1);
294
295 dma_unmap_sg(info->dev, ch->sglist, nr_pages, DMA_TO_DEVICE);
296 }
297
298 static void sh_mobile_lcdc_deferred_io_touch(struct fb_info *info)
299 {
300 struct fb_deferred_io *fbdefio = info->fbdefio;
301
302 if (fbdefio)
303 schedule_delayed_work(&info->deferred_work, fbdefio->delay);
304 }
305
306 static irqreturn_t sh_mobile_lcdc_irq(int irq, void *data)
307 {
308 struct sh_mobile_lcdc_priv *priv = data;
309 struct sh_mobile_lcdc_chan *ch;
310 unsigned long tmp;
311 unsigned long ldintr;
312 int is_sub;
313 int k;
314
315 /* acknowledge interrupt */
316 ldintr = tmp = lcdc_read(priv, _LDINTR);
317 /*
318 * disable further VSYNC End IRQs, preserve all other enabled IRQs,
319 * write 0 to bits 0-6 to ack all triggered IRQs.
320 */
321 tmp &= 0xffffff00 & ~LDINTR_VEE;
322 lcdc_write(priv, _LDINTR, tmp);
323
324 /* figure out if this interrupt is for main or sub lcd */
325 is_sub = (lcdc_read(priv, _LDSR) & (1 << 10)) ? 1 : 0;
326
327 /* wake up channel and disable clocks */
328 for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
329 ch = &priv->ch[k];
330
331 if (!ch->enabled)
332 continue;
333
334 /* Frame Start */
335 if (ldintr & LDINTR_FS) {
336 if (is_sub == lcdc_chan_is_sublcd(ch)) {
337 ch->frame_end = 1;
338 wake_up(&ch->frame_end_wait);
339
340 sh_mobile_lcdc_clk_off(priv);
341 }
342 }
343
344 /* VSYNC End */
345 if (ldintr & LDINTR_VES) {
346 unsigned long ldrcntr = lcdc_read(priv, _LDRCNTR);
347 /* Set the source address for the next refresh */
348 lcdc_write_chan_mirror(ch, LDSA1R, ch->dma_handle +
349 ch->new_pan_offset);
350 if (lcdc_chan_is_sublcd(ch))
351 lcdc_write(ch->lcdc, _LDRCNTR,
352 ldrcntr ^ LDRCNTR_SRS);
353 else
354 lcdc_write(ch->lcdc, _LDRCNTR,
355 ldrcntr ^ LDRCNTR_MRS);
356 ch->pan_offset = ch->new_pan_offset;
357 }
358 }
359
360 return IRQ_HANDLED;
361 }
362
363 static void sh_mobile_lcdc_start_stop(struct sh_mobile_lcdc_priv *priv,
364 int start)
365 {
366 unsigned long tmp = lcdc_read(priv, _LDCNT2R);
367 int k;
368
369 /* start or stop the lcdc */
370 if (start)
371 lcdc_write(priv, _LDCNT2R, tmp | START_LCDC);
372 else
373 lcdc_write(priv, _LDCNT2R, tmp & ~START_LCDC);
374
375 /* wait until power is applied/stopped on all channels */
376 for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
377 if (lcdc_read(priv, _LDCNT2R) & priv->ch[k].enabled)
378 while (1) {
379 tmp = lcdc_read_chan(&priv->ch[k], LDPMR) & 3;
380 if (start && tmp == 3)
381 break;
382 if (!start && tmp == 0)
383 break;
384 cpu_relax();
385 }
386
387 if (!start)
388 lcdc_write(priv, _LDDCKSTPR, 1); /* stop dotclock */
389 }
390
391 static int sh_mobile_lcdc_start(struct sh_mobile_lcdc_priv *priv)
392 {
393 struct sh_mobile_lcdc_chan *ch;
394 struct fb_videomode *lcd_cfg;
395 struct sh_mobile_lcdc_board_cfg *board_cfg;
396 unsigned long tmp;
397 int k, m;
398 int ret = 0;
399
400 /* enable clocks before accessing the hardware */
401 for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
402 if (priv->ch[k].enabled)
403 sh_mobile_lcdc_clk_on(priv);
404
405 /* reset */
406 lcdc_write(priv, _LDCNT2R, lcdc_read(priv, _LDCNT2R) | LCDC_RESET);
407 lcdc_wait_bit(priv, _LDCNT2R, LCDC_RESET, 0);
408
409 /* enable LCDC channels */
410 tmp = lcdc_read(priv, _LDCNT2R);
411 tmp |= priv->ch[0].enabled;
412 tmp |= priv->ch[1].enabled;
413 lcdc_write(priv, _LDCNT2R, tmp);
414
415 /* read data from external memory, avoid using the BEU for now */
416 lcdc_write(priv, _LDCNT2R, lcdc_read(priv, _LDCNT2R) & ~DISPLAY_BEU);
417
418 /* stop the lcdc first */
419 sh_mobile_lcdc_start_stop(priv, 0);
420
421 /* configure clocks */
422 tmp = priv->lddckr;
423 for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
424 ch = &priv->ch[k];
425
426 if (!priv->ch[k].enabled)
427 continue;
428
429 m = ch->cfg.clock_divider;
430 if (!m)
431 continue;
432
433 if (m == 1)
434 m = 1 << 6;
435 tmp |= m << (lcdc_chan_is_sublcd(ch) ? 8 : 0);
436
437 lcdc_write_chan(ch, LDDCKPAT1R, 0x00000000);
438 lcdc_write_chan(ch, LDDCKPAT2R, (1 << (m/2)) - 1);
439 }
440
441 lcdc_write(priv, _LDDCKR, tmp);
442
443 /* start dotclock again */
444 lcdc_write(priv, _LDDCKSTPR, 0);
445 lcdc_wait_bit(priv, _LDDCKSTPR, ~0, 0);
446
447 /* interrupts are disabled to begin with */
448 lcdc_write(priv, _LDINTR, 0);
449
450 for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
451 ch = &priv->ch[k];
452 lcd_cfg = &ch->cfg.lcd_cfg;
453
454 if (!ch->enabled)
455 continue;
456
457 tmp = ch->ldmt1r_value;
458 tmp |= (lcd_cfg->sync & FB_SYNC_VERT_HIGH_ACT) ? 0 : 1 << 28;
459 tmp |= (lcd_cfg->sync & FB_SYNC_HOR_HIGH_ACT) ? 0 : 1 << 27;
460 tmp |= (ch->cfg.flags & LCDC_FLAGS_DWPOL) ? 1 << 26 : 0;
461 tmp |= (ch->cfg.flags & LCDC_FLAGS_DIPOL) ? 1 << 25 : 0;
462 tmp |= (ch->cfg.flags & LCDC_FLAGS_DAPOL) ? 1 << 24 : 0;
463 tmp |= (ch->cfg.flags & LCDC_FLAGS_HSCNT) ? 1 << 17 : 0;
464 tmp |= (ch->cfg.flags & LCDC_FLAGS_DWCNT) ? 1 << 16 : 0;
465 lcdc_write_chan(ch, LDMT1R, tmp);
466
467 /* setup SYS bus */
468 lcdc_write_chan(ch, LDMT2R, ch->cfg.sys_bus_cfg.ldmt2r);
469 lcdc_write_chan(ch, LDMT3R, ch->cfg.sys_bus_cfg.ldmt3r);
470
471 /* horizontal configuration */
472 tmp = lcd_cfg->xres + lcd_cfg->hsync_len;
473 tmp += lcd_cfg->left_margin;
474 tmp += lcd_cfg->right_margin;
475 tmp /= 8; /* HTCN */
476 tmp |= (lcd_cfg->xres / 8) << 16; /* HDCN */
477 lcdc_write_chan(ch, LDHCNR, tmp);
478
479 tmp = lcd_cfg->xres;
480 tmp += lcd_cfg->right_margin;
481 tmp /= 8; /* HSYNP */
482 tmp |= (lcd_cfg->hsync_len / 8) << 16; /* HSYNW */
483 lcdc_write_chan(ch, LDHSYNR, tmp);
484
485 /* power supply */
486 lcdc_write_chan(ch, LDPMR, 0);
487
488 /* vertical configuration */
489 tmp = lcd_cfg->yres + lcd_cfg->vsync_len;
490 tmp += lcd_cfg->upper_margin;
491 tmp += lcd_cfg->lower_margin; /* VTLN */
492 tmp |= lcd_cfg->yres << 16; /* VDLN */
493 lcdc_write_chan(ch, LDVLNR, tmp);
494
495 tmp = lcd_cfg->yres;
496 tmp += lcd_cfg->lower_margin; /* VSYNP */
497 tmp |= lcd_cfg->vsync_len << 16; /* VSYNW */
498 lcdc_write_chan(ch, LDVSYNR, tmp);
499
500 board_cfg = &ch->cfg.board_cfg;
501 if (board_cfg->setup_sys)
502 ret = board_cfg->setup_sys(board_cfg->board_data, ch,
503 &sh_mobile_lcdc_sys_bus_ops);
504 if (ret)
505 return ret;
506 }
507
508 /* word and long word swap */
509 lcdc_write(priv, _LDDDSR, lcdc_read(priv, _LDDDSR) | 6);
510
511 for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
512 ch = &priv->ch[k];
513
514 if (!priv->ch[k].enabled)
515 continue;
516
517 /* set bpp format in PKF[4:0] */
518 tmp = lcdc_read_chan(ch, LDDFR);
519 tmp &= ~(0x0001001f);
520 tmp |= (ch->info->var.bits_per_pixel == 16) ? 3 : 0;
521 lcdc_write_chan(ch, LDDFR, tmp);
522
523 /* point out our frame buffer */
524 lcdc_write_chan(ch, LDSA1R, ch->info->fix.smem_start);
525
526 /* set line size */
527 lcdc_write_chan(ch, LDMLSR, ch->info->fix.line_length);
528
529 /* setup deferred io if SYS bus */
530 tmp = ch->cfg.sys_bus_cfg.deferred_io_msec;
531 if (ch->ldmt1r_value & (1 << 12) && tmp) {
532 ch->defio.deferred_io = sh_mobile_lcdc_deferred_io;
533 ch->defio.delay = msecs_to_jiffies(tmp);
534 ch->info->fbdefio = &ch->defio;
535 fb_deferred_io_init(ch->info);
536
537 /* one-shot mode */
538 lcdc_write_chan(ch, LDSM1R, 1);
539
540 /* enable "Frame End Interrupt Enable" bit */
541 lcdc_write(priv, _LDINTR, LDINTR_FE);
542
543 } else {
544 /* continuous read mode */
545 lcdc_write_chan(ch, LDSM1R, 0);
546 }
547 }
548
549 /* display output */
550 lcdc_write(priv, _LDCNT1R, LCDC_ENABLE);
551
552 /* start the lcdc */
553 sh_mobile_lcdc_start_stop(priv, 1);
554 priv->started = 1;
555
556 /* tell the board code to enable the panel */
557 for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
558 ch = &priv->ch[k];
559 if (!ch->enabled)
560 continue;
561
562 board_cfg = &ch->cfg.board_cfg;
563 if (board_cfg->display_on)
564 board_cfg->display_on(board_cfg->board_data);
565 }
566
567 return 0;
568 }
569
570 static void sh_mobile_lcdc_stop(struct sh_mobile_lcdc_priv *priv)
571 {
572 struct sh_mobile_lcdc_chan *ch;
573 struct sh_mobile_lcdc_board_cfg *board_cfg;
574 int k;
575
576 /* clean up deferred io and ask board code to disable panel */
577 for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
578 ch = &priv->ch[k];
579 if (!ch->enabled)
580 continue;
581
582 /* deferred io mode:
583 * flush frame, and wait for frame end interrupt
584 * clean up deferred io and enable clock
585 */
586 if (ch->info->fbdefio) {
587 ch->frame_end = 0;
588 schedule_delayed_work(&ch->info->deferred_work, 0);
589 wait_event(ch->frame_end_wait, ch->frame_end);
590 fb_deferred_io_cleanup(ch->info);
591 ch->info->fbdefio = NULL;
592 sh_mobile_lcdc_clk_on(priv);
593 }
594
595 board_cfg = &ch->cfg.board_cfg;
596 if (board_cfg->display_off)
597 board_cfg->display_off(board_cfg->board_data);
598 }
599
600 /* stop the lcdc */
601 if (priv->started) {
602 sh_mobile_lcdc_start_stop(priv, 0);
603 priv->started = 0;
604 }
605
606 /* stop clocks */
607 for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
608 if (priv->ch[k].enabled)
609 sh_mobile_lcdc_clk_off(priv);
610 }
611
612 static int sh_mobile_lcdc_check_interface(struct sh_mobile_lcdc_chan *ch)
613 {
614 int ifm, miftyp;
615
616 switch (ch->cfg.interface_type) {
617 case RGB8: ifm = 0; miftyp = 0; break;
618 case RGB9: ifm = 0; miftyp = 4; break;
619 case RGB12A: ifm = 0; miftyp = 5; break;
620 case RGB12B: ifm = 0; miftyp = 6; break;
621 case RGB16: ifm = 0; miftyp = 7; break;
622 case RGB18: ifm = 0; miftyp = 10; break;
623 case RGB24: ifm = 0; miftyp = 11; break;
624 case SYS8A: ifm = 1; miftyp = 0; break;
625 case SYS8B: ifm = 1; miftyp = 1; break;
626 case SYS8C: ifm = 1; miftyp = 2; break;
627 case SYS8D: ifm = 1; miftyp = 3; break;
628 case SYS9: ifm = 1; miftyp = 4; break;
629 case SYS12: ifm = 1; miftyp = 5; break;
630 case SYS16A: ifm = 1; miftyp = 7; break;
631 case SYS16B: ifm = 1; miftyp = 8; break;
632 case SYS16C: ifm = 1; miftyp = 9; break;
633 case SYS18: ifm = 1; miftyp = 10; break;
634 case SYS24: ifm = 1; miftyp = 11; break;
635 default: goto bad;
636 }
637
638 /* SUBLCD only supports SYS interface */
639 if (lcdc_chan_is_sublcd(ch)) {
640 if (ifm == 0)
641 goto bad;
642 else
643 ifm = 0;
644 }
645
646 ch->ldmt1r_value = (ifm << 12) | miftyp;
647 return 0;
648 bad:
649 return -EINVAL;
650 }
651
652 static int sh_mobile_lcdc_setup_clocks(struct platform_device *pdev,
653 int clock_source,
654 struct sh_mobile_lcdc_priv *priv)
655 {
656 char *str;
657 int icksel;
658
659 switch (clock_source) {
660 case LCDC_CLK_BUS: str = "bus_clk"; icksel = 0; break;
661 case LCDC_CLK_PERIPHERAL: str = "peripheral_clk"; icksel = 1; break;
662 case LCDC_CLK_EXTERNAL: str = NULL; icksel = 2; break;
663 default:
664 return -EINVAL;
665 }
666
667 priv->lddckr = icksel << 16;
668
669 if (str) {
670 priv->dot_clk = clk_get(&pdev->dev, str);
671 if (IS_ERR(priv->dot_clk)) {
672 dev_err(&pdev->dev, "cannot get dot clock %s\n", str);
673 return PTR_ERR(priv->dot_clk);
674 }
675 }
676 atomic_set(&priv->hw_usecnt, -1);
677
678 /* Runtime PM support involves two step for this driver:
679 * 1) Enable Runtime PM
680 * 2) Force Runtime PM Resume since hardware is accessed from probe()
681 */
682 pm_runtime_enable(priv->dev);
683 pm_runtime_resume(priv->dev);
684 return 0;
685 }
686
687 static int sh_mobile_lcdc_setcolreg(u_int regno,
688 u_int red, u_int green, u_int blue,
689 u_int transp, struct fb_info *info)
690 {
691 u32 *palette = info->pseudo_palette;
692
693 if (regno >= PALETTE_NR)
694 return -EINVAL;
695
696 /* only FB_VISUAL_TRUECOLOR supported */
697
698 red >>= 16 - info->var.red.length;
699 green >>= 16 - info->var.green.length;
700 blue >>= 16 - info->var.blue.length;
701 transp >>= 16 - info->var.transp.length;
702
703 palette[regno] = (red << info->var.red.offset) |
704 (green << info->var.green.offset) |
705 (blue << info->var.blue.offset) |
706 (transp << info->var.transp.offset);
707
708 return 0;
709 }
710
711 static struct fb_fix_screeninfo sh_mobile_lcdc_fix = {
712 .id = "SH Mobile LCDC",
713 .type = FB_TYPE_PACKED_PIXELS,
714 .visual = FB_VISUAL_TRUECOLOR,
715 .accel = FB_ACCEL_NONE,
716 .xpanstep = 0,
717 .ypanstep = 1,
718 .ywrapstep = 0,
719 };
720
721 static void sh_mobile_lcdc_fillrect(struct fb_info *info,
722 const struct fb_fillrect *rect)
723 {
724 sys_fillrect(info, rect);
725 sh_mobile_lcdc_deferred_io_touch(info);
726 }
727
728 static void sh_mobile_lcdc_copyarea(struct fb_info *info,
729 const struct fb_copyarea *area)
730 {
731 sys_copyarea(info, area);
732 sh_mobile_lcdc_deferred_io_touch(info);
733 }
734
735 static void sh_mobile_lcdc_imageblit(struct fb_info *info,
736 const struct fb_image *image)
737 {
738 sys_imageblit(info, image);
739 sh_mobile_lcdc_deferred_io_touch(info);
740 }
741
742 static int sh_mobile_fb_pan_display(struct fb_var_screeninfo *var,
743 struct fb_info *info)
744 {
745 struct sh_mobile_lcdc_chan *ch = info->par;
746
747 if (info->var.xoffset == var->xoffset &&
748 info->var.yoffset == var->yoffset)
749 return 0; /* No change, do nothing */
750
751 ch->new_pan_offset = (var->yoffset * info->fix.line_length) +
752 (var->xoffset * (info->var.bits_per_pixel / 8));
753
754 if (ch->new_pan_offset != ch->pan_offset) {
755 unsigned long ldintr;
756 ldintr = lcdc_read(ch->lcdc, _LDINTR);
757 ldintr |= LDINTR_VEE;
758 lcdc_write(ch->lcdc, _LDINTR, ldintr);
759 sh_mobile_lcdc_deferred_io_touch(info);
760 }
761
762 return 0;
763 }
764
765 static struct fb_ops sh_mobile_lcdc_ops = {
766 .owner = THIS_MODULE,
767 .fb_setcolreg = sh_mobile_lcdc_setcolreg,
768 .fb_read = fb_sys_read,
769 .fb_write = fb_sys_write,
770 .fb_fillrect = sh_mobile_lcdc_fillrect,
771 .fb_copyarea = sh_mobile_lcdc_copyarea,
772 .fb_imageblit = sh_mobile_lcdc_imageblit,
773 .fb_pan_display = sh_mobile_fb_pan_display,
774 };
775
776 static int sh_mobile_lcdc_set_bpp(struct fb_var_screeninfo *var, int bpp)
777 {
778 switch (bpp) {
779 case 16: /* PKF[4:0] = 00011 - RGB 565 */
780 var->red.offset = 11;
781 var->red.length = 5;
782 var->green.offset = 5;
783 var->green.length = 6;
784 var->blue.offset = 0;
785 var->blue.length = 5;
786 var->transp.offset = 0;
787 var->transp.length = 0;
788 break;
789
790 case 32: /* PKF[4:0] = 00000 - RGB 888
791 * sh7722 pdf says 00RRGGBB but reality is GGBB00RR
792 * this may be because LDDDSR has word swap enabled..
793 */
794 var->red.offset = 0;
795 var->red.length = 8;
796 var->green.offset = 24;
797 var->green.length = 8;
798 var->blue.offset = 16;
799 var->blue.length = 8;
800 var->transp.offset = 0;
801 var->transp.length = 0;
802 break;
803 default:
804 return -EINVAL;
805 }
806 var->bits_per_pixel = bpp;
807 var->red.msb_right = 0;
808 var->green.msb_right = 0;
809 var->blue.msb_right = 0;
810 var->transp.msb_right = 0;
811 return 0;
812 }
813
814 static int sh_mobile_lcdc_suspend(struct device *dev)
815 {
816 struct platform_device *pdev = to_platform_device(dev);
817
818 sh_mobile_lcdc_stop(platform_get_drvdata(pdev));
819 return 0;
820 }
821
822 static int sh_mobile_lcdc_resume(struct device *dev)
823 {
824 struct platform_device *pdev = to_platform_device(dev);
825
826 return sh_mobile_lcdc_start(platform_get_drvdata(pdev));
827 }
828
829 static int sh_mobile_lcdc_runtime_suspend(struct device *dev)
830 {
831 struct platform_device *pdev = to_platform_device(dev);
832 struct sh_mobile_lcdc_priv *p = platform_get_drvdata(pdev);
833 struct sh_mobile_lcdc_chan *ch;
834 int k, n;
835
836 /* save per-channel registers */
837 for (k = 0; k < ARRAY_SIZE(p->ch); k++) {
838 ch = &p->ch[k];
839 if (!ch->enabled)
840 continue;
841 for (n = 0; n < NR_CH_REGS; n++)
842 ch->saved_ch_regs[n] = lcdc_read_chan(ch, n);
843 }
844
845 /* save shared registers */
846 for (n = 0; n < NR_SHARED_REGS; n++)
847 p->saved_shared_regs[n] = lcdc_read(p, lcdc_shared_regs[n]);
848
849 /* turn off LCDC hardware */
850 lcdc_write(p, _LDCNT1R, 0);
851 return 0;
852 }
853
854 static int sh_mobile_lcdc_runtime_resume(struct device *dev)
855 {
856 struct platform_device *pdev = to_platform_device(dev);
857 struct sh_mobile_lcdc_priv *p = platform_get_drvdata(pdev);
858 struct sh_mobile_lcdc_chan *ch;
859 int k, n;
860
861 /* restore per-channel registers */
862 for (k = 0; k < ARRAY_SIZE(p->ch); k++) {
863 ch = &p->ch[k];
864 if (!ch->enabled)
865 continue;
866 for (n = 0; n < NR_CH_REGS; n++)
867 lcdc_write_chan(ch, n, ch->saved_ch_regs[n]);
868 }
869
870 /* restore shared registers */
871 for (n = 0; n < NR_SHARED_REGS; n++)
872 lcdc_write(p, lcdc_shared_regs[n], p->saved_shared_regs[n]);
873
874 return 0;
875 }
876
877 static struct dev_pm_ops sh_mobile_lcdc_dev_pm_ops = {
878 .suspend = sh_mobile_lcdc_suspend,
879 .resume = sh_mobile_lcdc_resume,
880 .runtime_suspend = sh_mobile_lcdc_runtime_suspend,
881 .runtime_resume = sh_mobile_lcdc_runtime_resume,
882 };
883
884 static int sh_mobile_lcdc_remove(struct platform_device *pdev);
885
886 static int __init sh_mobile_lcdc_probe(struct platform_device *pdev)
887 {
888 struct fb_info *info;
889 struct sh_mobile_lcdc_priv *priv;
890 struct sh_mobile_lcdc_info *pdata;
891 struct sh_mobile_lcdc_chan_cfg *cfg;
892 struct resource *res;
893 int error;
894 void *buf;
895 int i, j;
896
897 if (!pdev->dev.platform_data) {
898 dev_err(&pdev->dev, "no platform data defined\n");
899 error = -EINVAL;
900 goto err0;
901 }
902
903 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
904 i = platform_get_irq(pdev, 0);
905 if (!res || i < 0) {
906 dev_err(&pdev->dev, "cannot get platform resources\n");
907 error = -ENOENT;
908 goto err0;
909 }
910
911 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
912 if (!priv) {
913 dev_err(&pdev->dev, "cannot allocate device data\n");
914 error = -ENOMEM;
915 goto err0;
916 }
917
918 error = request_irq(i, sh_mobile_lcdc_irq, IRQF_DISABLED,
919 dev_name(&pdev->dev), priv);
920 if (error) {
921 dev_err(&pdev->dev, "unable to request irq\n");
922 goto err1;
923 }
924
925 priv->irq = i;
926 priv->dev = &pdev->dev;
927 platform_set_drvdata(pdev, priv);
928 pdata = pdev->dev.platform_data;
929
930 j = 0;
931 for (i = 0; i < ARRAY_SIZE(pdata->ch); i++) {
932 priv->ch[j].lcdc = priv;
933 memcpy(&priv->ch[j].cfg, &pdata->ch[i], sizeof(pdata->ch[i]));
934
935 error = sh_mobile_lcdc_check_interface(&priv->ch[i]);
936 if (error) {
937 dev_err(&pdev->dev, "unsupported interface type\n");
938 goto err1;
939 }
940 init_waitqueue_head(&priv->ch[i].frame_end_wait);
941 priv->ch[j].pan_offset = 0;
942 priv->ch[j].new_pan_offset = 0;
943
944 switch (pdata->ch[i].chan) {
945 case LCDC_CHAN_MAINLCD:
946 priv->ch[j].enabled = 1 << 1;
947 priv->ch[j].reg_offs = lcdc_offs_mainlcd;
948 j++;
949 break;
950 case LCDC_CHAN_SUBLCD:
951 priv->ch[j].enabled = 1 << 2;
952 priv->ch[j].reg_offs = lcdc_offs_sublcd;
953 j++;
954 break;
955 }
956 }
957
958 if (!j) {
959 dev_err(&pdev->dev, "no channels defined\n");
960 error = -EINVAL;
961 goto err1;
962 }
963
964 error = sh_mobile_lcdc_setup_clocks(pdev, pdata->clock_source, priv);
965 if (error) {
966 dev_err(&pdev->dev, "unable to setup clocks\n");
967 goto err1;
968 }
969
970 priv->base = ioremap_nocache(res->start, (res->end - res->start) + 1);
971
972 for (i = 0; i < j; i++) {
973 cfg = &priv->ch[i].cfg;
974
975 priv->ch[i].info = framebuffer_alloc(0, &pdev->dev);
976 if (!priv->ch[i].info) {
977 dev_err(&pdev->dev, "unable to allocate fb_info\n");
978 error = -ENOMEM;
979 break;
980 }
981
982 info = priv->ch[i].info;
983 info->fbops = &sh_mobile_lcdc_ops;
984 info->var.xres = info->var.xres_virtual = cfg->lcd_cfg.xres;
985 info->var.yres = cfg->lcd_cfg.yres;
986 /* Default Y virtual resolution is 2x panel size */
987 info->var.yres_virtual = info->var.yres * 2;
988 info->var.width = cfg->lcd_size_cfg.width;
989 info->var.height = cfg->lcd_size_cfg.height;
990 info->var.activate = FB_ACTIVATE_NOW;
991 error = sh_mobile_lcdc_set_bpp(&info->var, cfg->bpp);
992 if (error)
993 break;
994
995 info->fix = sh_mobile_lcdc_fix;
996 info->fix.line_length = cfg->lcd_cfg.xres * (cfg->bpp / 8);
997 info->fix.smem_len = info->fix.line_length *
998 info->var.yres_virtual;
999
1000 buf = dma_alloc_coherent(&pdev->dev, info->fix.smem_len,
1001 &priv->ch[i].dma_handle, GFP_KERNEL);
1002 if (!buf) {
1003 dev_err(&pdev->dev, "unable to allocate buffer\n");
1004 error = -ENOMEM;
1005 break;
1006 }
1007
1008 info->pseudo_palette = &priv->ch[i].pseudo_palette;
1009 info->flags = FBINFO_FLAG_DEFAULT;
1010
1011 error = fb_alloc_cmap(&info->cmap, PALETTE_NR, 0);
1012 if (error < 0) {
1013 dev_err(&pdev->dev, "unable to allocate cmap\n");
1014 dma_free_coherent(&pdev->dev, info->fix.smem_len,
1015 buf, priv->ch[i].dma_handle);
1016 break;
1017 }
1018
1019 memset(buf, 0, info->fix.smem_len);
1020 info->fix.smem_start = priv->ch[i].dma_handle;
1021 info->screen_base = buf;
1022 info->device = &pdev->dev;
1023 info->par = &priv->ch[i];
1024 }
1025
1026 if (error)
1027 goto err1;
1028
1029 error = sh_mobile_lcdc_start(priv);
1030 if (error) {
1031 dev_err(&pdev->dev, "unable to start hardware\n");
1032 goto err1;
1033 }
1034
1035 for (i = 0; i < j; i++) {
1036 struct sh_mobile_lcdc_chan *ch = priv->ch + i;
1037
1038 info = ch->info;
1039
1040 if (info->fbdefio) {
1041 priv->ch->sglist = vmalloc(sizeof(struct scatterlist) *
1042 info->fix.smem_len >> PAGE_SHIFT);
1043 if (!priv->ch->sglist) {
1044 dev_err(&pdev->dev, "cannot allocate sglist\n");
1045 goto err1;
1046 }
1047 }
1048
1049 error = register_framebuffer(info);
1050 if (error < 0)
1051 goto err1;
1052
1053 dev_info(info->dev,
1054 "registered %s/%s as %dx%d %dbpp.\n",
1055 pdev->name,
1056 (ch->cfg.chan == LCDC_CHAN_MAINLCD) ?
1057 "mainlcd" : "sublcd",
1058 (int) ch->cfg.lcd_cfg.xres,
1059 (int) ch->cfg.lcd_cfg.yres,
1060 ch->cfg.bpp);
1061
1062 /* deferred io mode: disable clock to save power */
1063 if (info->fbdefio)
1064 sh_mobile_lcdc_clk_off(priv);
1065 }
1066
1067 return 0;
1068 err1:
1069 sh_mobile_lcdc_remove(pdev);
1070 err0:
1071 return error;
1072 }
1073
1074 static int sh_mobile_lcdc_remove(struct platform_device *pdev)
1075 {
1076 struct sh_mobile_lcdc_priv *priv = platform_get_drvdata(pdev);
1077 struct fb_info *info;
1078 int i;
1079
1080 for (i = 0; i < ARRAY_SIZE(priv->ch); i++)
1081 if (priv->ch[i].info->dev)
1082 unregister_framebuffer(priv->ch[i].info);
1083
1084 sh_mobile_lcdc_stop(priv);
1085
1086 for (i = 0; i < ARRAY_SIZE(priv->ch); i++) {
1087 info = priv->ch[i].info;
1088
1089 if (!info || !info->device)
1090 continue;
1091
1092 if (priv->ch[i].sglist)
1093 vfree(priv->ch[i].sglist);
1094
1095 dma_free_coherent(&pdev->dev, info->fix.smem_len,
1096 info->screen_base, priv->ch[i].dma_handle);
1097 fb_dealloc_cmap(&info->cmap);
1098 framebuffer_release(info);
1099 }
1100
1101 if (priv->dot_clk)
1102 clk_put(priv->dot_clk);
1103
1104 pm_runtime_disable(priv->dev);
1105
1106 if (priv->base)
1107 iounmap(priv->base);
1108
1109 if (priv->irq)
1110 free_irq(priv->irq, priv);
1111 kfree(priv);
1112 return 0;
1113 }
1114
1115 static struct platform_driver sh_mobile_lcdc_driver = {
1116 .driver = {
1117 .name = "sh_mobile_lcdc_fb",
1118 .owner = THIS_MODULE,
1119 .pm = &sh_mobile_lcdc_dev_pm_ops,
1120 },
1121 .probe = sh_mobile_lcdc_probe,
1122 .remove = sh_mobile_lcdc_remove,
1123 };
1124
1125 static int __init sh_mobile_lcdc_init(void)
1126 {
1127 return platform_driver_register(&sh_mobile_lcdc_driver);
1128 }
1129
1130 static void __exit sh_mobile_lcdc_exit(void)
1131 {
1132 platform_driver_unregister(&sh_mobile_lcdc_driver);
1133 }
1134
1135 module_init(sh_mobile_lcdc_init);
1136 module_exit(sh_mobile_lcdc_exit);
1137
1138 MODULE_DESCRIPTION("SuperH Mobile LCDC Framebuffer driver");
1139 MODULE_AUTHOR("Magnus Damm <damm@opensource.se>");
1140 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support