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fbdev: fix snprintf() limit in show_bl_curve()
[deliverable/linux.git] / drivers / video / fbdev / da8xx-fb.c
1 /*
2 * Copyright (C) 2008-2009 MontaVista Software Inc.
3 * Copyright (C) 2008-2009 Texas Instruments Inc
4 *
5 * Based on the LCD driver for TI Avalanche processors written by
6 * Ajay Singh and Shalom Hai.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option)any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22 #include <linux/module.h>
23 #include <linux/kernel.h>
24 #include <linux/fb.h>
25 #include <linux/dma-mapping.h>
26 #include <linux/device.h>
27 #include <linux/platform_device.h>
28 #include <linux/uaccess.h>
29 #include <linux/pm_runtime.h>
30 #include <linux/interrupt.h>
31 #include <linux/wait.h>
32 #include <linux/clk.h>
33 #include <linux/cpufreq.h>
34 #include <linux/console.h>
35 #include <linux/spinlock.h>
36 #include <linux/slab.h>
37 #include <linux/delay.h>
38 #include <linux/lcm.h>
39 #include <video/da8xx-fb.h>
40 #include <asm/div64.h>
41
42 #define DRIVER_NAME "da8xx_lcdc"
43
44 #define LCD_VERSION_1 1
45 #define LCD_VERSION_2 2
46
47 /* LCD Status Register */
48 #define LCD_END_OF_FRAME1 BIT(9)
49 #define LCD_END_OF_FRAME0 BIT(8)
50 #define LCD_PL_LOAD_DONE BIT(6)
51 #define LCD_FIFO_UNDERFLOW BIT(5)
52 #define LCD_SYNC_LOST BIT(2)
53 #define LCD_FRAME_DONE BIT(0)
54
55 /* LCD DMA Control Register */
56 #define LCD_DMA_BURST_SIZE(x) ((x) << 4)
57 #define LCD_DMA_BURST_1 0x0
58 #define LCD_DMA_BURST_2 0x1
59 #define LCD_DMA_BURST_4 0x2
60 #define LCD_DMA_BURST_8 0x3
61 #define LCD_DMA_BURST_16 0x4
62 #define LCD_V1_END_OF_FRAME_INT_ENA BIT(2)
63 #define LCD_V2_END_OF_FRAME0_INT_ENA BIT(8)
64 #define LCD_V2_END_OF_FRAME1_INT_ENA BIT(9)
65 #define LCD_DUAL_FRAME_BUFFER_ENABLE BIT(0)
66
67 /* LCD Control Register */
68 #define LCD_CLK_DIVISOR(x) ((x) << 8)
69 #define LCD_RASTER_MODE 0x01
70
71 /* LCD Raster Control Register */
72 #define LCD_PALETTE_LOAD_MODE(x) ((x) << 20)
73 #define PALETTE_AND_DATA 0x00
74 #define PALETTE_ONLY 0x01
75 #define DATA_ONLY 0x02
76
77 #define LCD_MONO_8BIT_MODE BIT(9)
78 #define LCD_RASTER_ORDER BIT(8)
79 #define LCD_TFT_MODE BIT(7)
80 #define LCD_V1_UNDERFLOW_INT_ENA BIT(6)
81 #define LCD_V2_UNDERFLOW_INT_ENA BIT(5)
82 #define LCD_V1_PL_INT_ENA BIT(4)
83 #define LCD_V2_PL_INT_ENA BIT(6)
84 #define LCD_MONOCHROME_MODE BIT(1)
85 #define LCD_RASTER_ENABLE BIT(0)
86 #define LCD_TFT_ALT_ENABLE BIT(23)
87 #define LCD_STN_565_ENABLE BIT(24)
88 #define LCD_V2_DMA_CLK_EN BIT(2)
89 #define LCD_V2_LIDD_CLK_EN BIT(1)
90 #define LCD_V2_CORE_CLK_EN BIT(0)
91 #define LCD_V2_LPP_B10 26
92 #define LCD_V2_TFT_24BPP_MODE BIT(25)
93 #define LCD_V2_TFT_24BPP_UNPACK BIT(26)
94
95 /* LCD Raster Timing 2 Register */
96 #define LCD_AC_BIAS_TRANSITIONS_PER_INT(x) ((x) << 16)
97 #define LCD_AC_BIAS_FREQUENCY(x) ((x) << 8)
98 #define LCD_SYNC_CTRL BIT(25)
99 #define LCD_SYNC_EDGE BIT(24)
100 #define LCD_INVERT_PIXEL_CLOCK BIT(22)
101 #define LCD_INVERT_LINE_CLOCK BIT(21)
102 #define LCD_INVERT_FRAME_CLOCK BIT(20)
103
104 /* LCD Block */
105 #define LCD_PID_REG 0x0
106 #define LCD_CTRL_REG 0x4
107 #define LCD_STAT_REG 0x8
108 #define LCD_RASTER_CTRL_REG 0x28
109 #define LCD_RASTER_TIMING_0_REG 0x2C
110 #define LCD_RASTER_TIMING_1_REG 0x30
111 #define LCD_RASTER_TIMING_2_REG 0x34
112 #define LCD_DMA_CTRL_REG 0x40
113 #define LCD_DMA_FRM_BUF_BASE_ADDR_0_REG 0x44
114 #define LCD_DMA_FRM_BUF_CEILING_ADDR_0_REG 0x48
115 #define LCD_DMA_FRM_BUF_BASE_ADDR_1_REG 0x4C
116 #define LCD_DMA_FRM_BUF_CEILING_ADDR_1_REG 0x50
117
118 /* Interrupt Registers available only in Version 2 */
119 #define LCD_RAW_STAT_REG 0x58
120 #define LCD_MASKED_STAT_REG 0x5c
121 #define LCD_INT_ENABLE_SET_REG 0x60
122 #define LCD_INT_ENABLE_CLR_REG 0x64
123 #define LCD_END_OF_INT_IND_REG 0x68
124
125 /* Clock registers available only on Version 2 */
126 #define LCD_CLK_ENABLE_REG 0x6c
127 #define LCD_CLK_RESET_REG 0x70
128 #define LCD_CLK_MAIN_RESET BIT(3)
129
130 #define LCD_NUM_BUFFERS 2
131
132 #define PALETTE_SIZE 256
133
134 #define CLK_MIN_DIV 2
135 #define CLK_MAX_DIV 255
136
137 static void __iomem *da8xx_fb_reg_base;
138 static unsigned int lcd_revision;
139 static irq_handler_t lcdc_irq_handler;
140 static wait_queue_head_t frame_done_wq;
141 static int frame_done_flag;
142
143 static unsigned int lcdc_read(unsigned int addr)
144 {
145 return (unsigned int)__raw_readl(da8xx_fb_reg_base + (addr));
146 }
147
148 static void lcdc_write(unsigned int val, unsigned int addr)
149 {
150 __raw_writel(val, da8xx_fb_reg_base + (addr));
151 }
152
153 struct da8xx_fb_par {
154 struct device *dev;
155 resource_size_t p_palette_base;
156 unsigned char *v_palette_base;
157 dma_addr_t vram_phys;
158 unsigned long vram_size;
159 void *vram_virt;
160 unsigned int dma_start;
161 unsigned int dma_end;
162 struct clk *lcdc_clk;
163 int irq;
164 unsigned int palette_sz;
165 int blank;
166 wait_queue_head_t vsync_wait;
167 int vsync_flag;
168 int vsync_timeout;
169 spinlock_t lock_for_chan_update;
170
171 /*
172 * LCDC has 2 ping pong DMA channels, channel 0
173 * and channel 1.
174 */
175 unsigned int which_dma_channel_done;
176 #ifdef CONFIG_CPU_FREQ
177 struct notifier_block freq_transition;
178 #endif
179 unsigned int lcdc_clk_rate;
180 void (*panel_power_ctrl)(int);
181 u32 pseudo_palette[16];
182 struct fb_videomode mode;
183 struct lcd_ctrl_config cfg;
184 };
185
186 static struct fb_var_screeninfo da8xx_fb_var;
187
188 static struct fb_fix_screeninfo da8xx_fb_fix = {
189 .id = "DA8xx FB Drv",
190 .type = FB_TYPE_PACKED_PIXELS,
191 .type_aux = 0,
192 .visual = FB_VISUAL_PSEUDOCOLOR,
193 .xpanstep = 0,
194 .ypanstep = 1,
195 .ywrapstep = 0,
196 .accel = FB_ACCEL_NONE
197 };
198
199 static struct fb_videomode known_lcd_panels[] = {
200 /* Sharp LCD035Q3DG01 */
201 [0] = {
202 .name = "Sharp_LCD035Q3DG01",
203 .xres = 320,
204 .yres = 240,
205 .pixclock = KHZ2PICOS(4607),
206 .left_margin = 6,
207 .right_margin = 8,
208 .upper_margin = 2,
209 .lower_margin = 2,
210 .hsync_len = 0,
211 .vsync_len = 0,
212 .sync = FB_SYNC_CLK_INVERT |
213 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
214 },
215 /* Sharp LK043T1DG01 */
216 [1] = {
217 .name = "Sharp_LK043T1DG01",
218 .xres = 480,
219 .yres = 272,
220 .pixclock = KHZ2PICOS(7833),
221 .left_margin = 2,
222 .right_margin = 2,
223 .upper_margin = 2,
224 .lower_margin = 2,
225 .hsync_len = 41,
226 .vsync_len = 10,
227 .sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
228 .flag = 0,
229 },
230 [2] = {
231 /* Hitachi SP10Q010 */
232 .name = "SP10Q010",
233 .xres = 320,
234 .yres = 240,
235 .pixclock = KHZ2PICOS(7833),
236 .left_margin = 10,
237 .right_margin = 10,
238 .upper_margin = 10,
239 .lower_margin = 10,
240 .hsync_len = 10,
241 .vsync_len = 10,
242 .sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
243 .flag = 0,
244 },
245 [3] = {
246 /* Densitron 84-0023-001T */
247 .name = "Densitron_84-0023-001T",
248 .xres = 320,
249 .yres = 240,
250 .pixclock = KHZ2PICOS(6400),
251 .left_margin = 0,
252 .right_margin = 0,
253 .upper_margin = 0,
254 .lower_margin = 0,
255 .hsync_len = 30,
256 .vsync_len = 3,
257 .sync = 0,
258 },
259 };
260
261 static bool da8xx_fb_is_raster_enabled(void)
262 {
263 return !!(lcdc_read(LCD_RASTER_CTRL_REG) & LCD_RASTER_ENABLE);
264 }
265
266 /* Enable the Raster Engine of the LCD Controller */
267 static void lcd_enable_raster(void)
268 {
269 u32 reg;
270
271 /* Put LCDC in reset for several cycles */
272 if (lcd_revision == LCD_VERSION_2)
273 /* Write 1 to reset LCDC */
274 lcdc_write(LCD_CLK_MAIN_RESET, LCD_CLK_RESET_REG);
275 mdelay(1);
276
277 /* Bring LCDC out of reset */
278 if (lcd_revision == LCD_VERSION_2)
279 lcdc_write(0, LCD_CLK_RESET_REG);
280 mdelay(1);
281
282 /* Above reset sequence doesnot reset register context */
283 reg = lcdc_read(LCD_RASTER_CTRL_REG);
284 if (!(reg & LCD_RASTER_ENABLE))
285 lcdc_write(reg | LCD_RASTER_ENABLE, LCD_RASTER_CTRL_REG);
286 }
287
288 /* Disable the Raster Engine of the LCD Controller */
289 static void lcd_disable_raster(enum da8xx_frame_complete wait_for_frame_done)
290 {
291 u32 reg;
292 int ret;
293
294 reg = lcdc_read(LCD_RASTER_CTRL_REG);
295 if (reg & LCD_RASTER_ENABLE)
296 lcdc_write(reg & ~LCD_RASTER_ENABLE, LCD_RASTER_CTRL_REG);
297 else
298 /* return if already disabled */
299 return;
300
301 if ((wait_for_frame_done == DA8XX_FRAME_WAIT) &&
302 (lcd_revision == LCD_VERSION_2)) {
303 frame_done_flag = 0;
304 ret = wait_event_interruptible_timeout(frame_done_wq,
305 frame_done_flag != 0,
306 msecs_to_jiffies(50));
307 if (ret == 0)
308 pr_err("LCD Controller timed out\n");
309 }
310 }
311
312 static void lcd_blit(int load_mode, struct da8xx_fb_par *par)
313 {
314 u32 start;
315 u32 end;
316 u32 reg_ras;
317 u32 reg_dma;
318 u32 reg_int;
319
320 /* init reg to clear PLM (loading mode) fields */
321 reg_ras = lcdc_read(LCD_RASTER_CTRL_REG);
322 reg_ras &= ~(3 << 20);
323
324 reg_dma = lcdc_read(LCD_DMA_CTRL_REG);
325
326 if (load_mode == LOAD_DATA) {
327 start = par->dma_start;
328 end = par->dma_end;
329
330 reg_ras |= LCD_PALETTE_LOAD_MODE(DATA_ONLY);
331 if (lcd_revision == LCD_VERSION_1) {
332 reg_dma |= LCD_V1_END_OF_FRAME_INT_ENA;
333 } else {
334 reg_int = lcdc_read(LCD_INT_ENABLE_SET_REG) |
335 LCD_V2_END_OF_FRAME0_INT_ENA |
336 LCD_V2_END_OF_FRAME1_INT_ENA |
337 LCD_FRAME_DONE | LCD_SYNC_LOST;
338 lcdc_write(reg_int, LCD_INT_ENABLE_SET_REG);
339 }
340 reg_dma |= LCD_DUAL_FRAME_BUFFER_ENABLE;
341
342 lcdc_write(start, LCD_DMA_FRM_BUF_BASE_ADDR_0_REG);
343 lcdc_write(end, LCD_DMA_FRM_BUF_CEILING_ADDR_0_REG);
344 lcdc_write(start, LCD_DMA_FRM_BUF_BASE_ADDR_1_REG);
345 lcdc_write(end, LCD_DMA_FRM_BUF_CEILING_ADDR_1_REG);
346 } else if (load_mode == LOAD_PALETTE) {
347 start = par->p_palette_base;
348 end = start + par->palette_sz - 1;
349
350 reg_ras |= LCD_PALETTE_LOAD_MODE(PALETTE_ONLY);
351
352 if (lcd_revision == LCD_VERSION_1) {
353 reg_ras |= LCD_V1_PL_INT_ENA;
354 } else {
355 reg_int = lcdc_read(LCD_INT_ENABLE_SET_REG) |
356 LCD_V2_PL_INT_ENA;
357 lcdc_write(reg_int, LCD_INT_ENABLE_SET_REG);
358 }
359
360 lcdc_write(start, LCD_DMA_FRM_BUF_BASE_ADDR_0_REG);
361 lcdc_write(end, LCD_DMA_FRM_BUF_CEILING_ADDR_0_REG);
362 }
363
364 lcdc_write(reg_dma, LCD_DMA_CTRL_REG);
365 lcdc_write(reg_ras, LCD_RASTER_CTRL_REG);
366
367 /*
368 * The Raster enable bit must be set after all other control fields are
369 * set.
370 */
371 lcd_enable_raster();
372 }
373
374 /* Configure the Burst Size and fifo threhold of DMA */
375 static int lcd_cfg_dma(int burst_size, int fifo_th)
376 {
377 u32 reg;
378
379 reg = lcdc_read(LCD_DMA_CTRL_REG) & 0x00000001;
380 switch (burst_size) {
381 case 1:
382 reg |= LCD_DMA_BURST_SIZE(LCD_DMA_BURST_1);
383 break;
384 case 2:
385 reg |= LCD_DMA_BURST_SIZE(LCD_DMA_BURST_2);
386 break;
387 case 4:
388 reg |= LCD_DMA_BURST_SIZE(LCD_DMA_BURST_4);
389 break;
390 case 8:
391 reg |= LCD_DMA_BURST_SIZE(LCD_DMA_BURST_8);
392 break;
393 case 16:
394 default:
395 reg |= LCD_DMA_BURST_SIZE(LCD_DMA_BURST_16);
396 break;
397 }
398
399 reg |= (fifo_th << 8);
400
401 lcdc_write(reg, LCD_DMA_CTRL_REG);
402
403 return 0;
404 }
405
406 static void lcd_cfg_ac_bias(int period, int transitions_per_int)
407 {
408 u32 reg;
409
410 /* Set the AC Bias Period and Number of Transisitons per Interrupt */
411 reg = lcdc_read(LCD_RASTER_TIMING_2_REG) & 0xFFF00000;
412 reg |= LCD_AC_BIAS_FREQUENCY(period) |
413 LCD_AC_BIAS_TRANSITIONS_PER_INT(transitions_per_int);
414 lcdc_write(reg, LCD_RASTER_TIMING_2_REG);
415 }
416
417 static void lcd_cfg_horizontal_sync(int back_porch, int pulse_width,
418 int front_porch)
419 {
420 u32 reg;
421
422 reg = lcdc_read(LCD_RASTER_TIMING_0_REG) & 0x3ff;
423 reg |= (((back_porch-1) & 0xff) << 24)
424 | (((front_porch-1) & 0xff) << 16)
425 | (((pulse_width-1) & 0x3f) << 10);
426 lcdc_write(reg, LCD_RASTER_TIMING_0_REG);
427
428 /*
429 * LCDC Version 2 adds some extra bits that increase the allowable
430 * size of the horizontal timing registers.
431 * remember that the registers use 0 to represent 1 so all values
432 * that get set into register need to be decremented by 1
433 */
434 if (lcd_revision == LCD_VERSION_2) {
435 /* Mask off the bits we want to change */
436 reg = lcdc_read(LCD_RASTER_TIMING_2_REG) & ~0x780000ff;
437 reg |= ((front_porch-1) & 0x300) >> 8;
438 reg |= ((back_porch-1) & 0x300) >> 4;
439 reg |= ((pulse_width-1) & 0x3c0) << 21;
440 lcdc_write(reg, LCD_RASTER_TIMING_2_REG);
441 }
442 }
443
444 static void lcd_cfg_vertical_sync(int back_porch, int pulse_width,
445 int front_porch)
446 {
447 u32 reg;
448
449 reg = lcdc_read(LCD_RASTER_TIMING_1_REG) & 0x3ff;
450 reg |= ((back_porch & 0xff) << 24)
451 | ((front_porch & 0xff) << 16)
452 | (((pulse_width-1) & 0x3f) << 10);
453 lcdc_write(reg, LCD_RASTER_TIMING_1_REG);
454 }
455
456 static int lcd_cfg_display(const struct lcd_ctrl_config *cfg,
457 struct fb_videomode *panel)
458 {
459 u32 reg;
460 u32 reg_int;
461
462 reg = lcdc_read(LCD_RASTER_CTRL_REG) & ~(LCD_TFT_MODE |
463 LCD_MONO_8BIT_MODE |
464 LCD_MONOCHROME_MODE);
465
466 switch (cfg->panel_shade) {
467 case MONOCHROME:
468 reg |= LCD_MONOCHROME_MODE;
469 if (cfg->mono_8bit_mode)
470 reg |= LCD_MONO_8BIT_MODE;
471 break;
472 case COLOR_ACTIVE:
473 reg |= LCD_TFT_MODE;
474 if (cfg->tft_alt_mode)
475 reg |= LCD_TFT_ALT_ENABLE;
476 break;
477
478 case COLOR_PASSIVE:
479 /* AC bias applicable only for Pasive panels */
480 lcd_cfg_ac_bias(cfg->ac_bias, cfg->ac_bias_intrpt);
481 if (cfg->bpp == 12 && cfg->stn_565_mode)
482 reg |= LCD_STN_565_ENABLE;
483 break;
484
485 default:
486 return -EINVAL;
487 }
488
489 /* enable additional interrupts here */
490 if (lcd_revision == LCD_VERSION_1) {
491 reg |= LCD_V1_UNDERFLOW_INT_ENA;
492 } else {
493 reg_int = lcdc_read(LCD_INT_ENABLE_SET_REG) |
494 LCD_V2_UNDERFLOW_INT_ENA;
495 lcdc_write(reg_int, LCD_INT_ENABLE_SET_REG);
496 }
497
498 lcdc_write(reg, LCD_RASTER_CTRL_REG);
499
500 reg = lcdc_read(LCD_RASTER_TIMING_2_REG);
501
502 reg |= LCD_SYNC_CTRL;
503
504 if (cfg->sync_edge)
505 reg |= LCD_SYNC_EDGE;
506 else
507 reg &= ~LCD_SYNC_EDGE;
508
509 if ((panel->sync & FB_SYNC_HOR_HIGH_ACT) == 0)
510 reg |= LCD_INVERT_LINE_CLOCK;
511 else
512 reg &= ~LCD_INVERT_LINE_CLOCK;
513
514 if ((panel->sync & FB_SYNC_VERT_HIGH_ACT) == 0)
515 reg |= LCD_INVERT_FRAME_CLOCK;
516 else
517 reg &= ~LCD_INVERT_FRAME_CLOCK;
518
519 lcdc_write(reg, LCD_RASTER_TIMING_2_REG);
520
521 return 0;
522 }
523
524 static int lcd_cfg_frame_buffer(struct da8xx_fb_par *par, u32 width, u32 height,
525 u32 bpp, u32 raster_order)
526 {
527 u32 reg;
528
529 if (bpp > 16 && lcd_revision == LCD_VERSION_1)
530 return -EINVAL;
531
532 /* Set the Panel Width */
533 /* Pixels per line = (PPL + 1)*16 */
534 if (lcd_revision == LCD_VERSION_1) {
535 /*
536 * 0x3F in bits 4..9 gives max horizontal resolution = 1024
537 * pixels.
538 */
539 width &= 0x3f0;
540 } else {
541 /*
542 * 0x7F in bits 4..10 gives max horizontal resolution = 2048
543 * pixels.
544 */
545 width &= 0x7f0;
546 }
547
548 reg = lcdc_read(LCD_RASTER_TIMING_0_REG);
549 reg &= 0xfffffc00;
550 if (lcd_revision == LCD_VERSION_1) {
551 reg |= ((width >> 4) - 1) << 4;
552 } else {
553 width = (width >> 4) - 1;
554 reg |= ((width & 0x3f) << 4) | ((width & 0x40) >> 3);
555 }
556 lcdc_write(reg, LCD_RASTER_TIMING_0_REG);
557
558 /* Set the Panel Height */
559 /* Set bits 9:0 of Lines Per Pixel */
560 reg = lcdc_read(LCD_RASTER_TIMING_1_REG);
561 reg = ((height - 1) & 0x3ff) | (reg & 0xfffffc00);
562 lcdc_write(reg, LCD_RASTER_TIMING_1_REG);
563
564 /* Set bit 10 of Lines Per Pixel */
565 if (lcd_revision == LCD_VERSION_2) {
566 reg = lcdc_read(LCD_RASTER_TIMING_2_REG);
567 reg |= ((height - 1) & 0x400) << 16;
568 lcdc_write(reg, LCD_RASTER_TIMING_2_REG);
569 }
570
571 /* Set the Raster Order of the Frame Buffer */
572 reg = lcdc_read(LCD_RASTER_CTRL_REG) & ~(1 << 8);
573 if (raster_order)
574 reg |= LCD_RASTER_ORDER;
575
576 par->palette_sz = 16 * 2;
577
578 switch (bpp) {
579 case 1:
580 case 2:
581 case 4:
582 case 16:
583 break;
584 case 24:
585 reg |= LCD_V2_TFT_24BPP_MODE;
586 break;
587 case 32:
588 reg |= LCD_V2_TFT_24BPP_MODE;
589 reg |= LCD_V2_TFT_24BPP_UNPACK;
590 break;
591 case 8:
592 par->palette_sz = 256 * 2;
593 break;
594
595 default:
596 return -EINVAL;
597 }
598
599 lcdc_write(reg, LCD_RASTER_CTRL_REG);
600
601 return 0;
602 }
603
604 #define CNVT_TOHW(val, width) ((((val) << (width)) + 0x7FFF - (val)) >> 16)
605 static int fb_setcolreg(unsigned regno, unsigned red, unsigned green,
606 unsigned blue, unsigned transp,
607 struct fb_info *info)
608 {
609 struct da8xx_fb_par *par = info->par;
610 unsigned short *palette = (unsigned short *) par->v_palette_base;
611 u_short pal;
612 int update_hw = 0;
613
614 if (regno > 255)
615 return 1;
616
617 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR)
618 return 1;
619
620 if (info->var.bits_per_pixel > 16 && lcd_revision == LCD_VERSION_1)
621 return -EINVAL;
622
623 switch (info->fix.visual) {
624 case FB_VISUAL_TRUECOLOR:
625 red = CNVT_TOHW(red, info->var.red.length);
626 green = CNVT_TOHW(green, info->var.green.length);
627 blue = CNVT_TOHW(blue, info->var.blue.length);
628 break;
629 case FB_VISUAL_PSEUDOCOLOR:
630 switch (info->var.bits_per_pixel) {
631 case 4:
632 if (regno > 15)
633 return -EINVAL;
634
635 if (info->var.grayscale) {
636 pal = regno;
637 } else {
638 red >>= 4;
639 green >>= 8;
640 blue >>= 12;
641
642 pal = red & 0x0f00;
643 pal |= green & 0x00f0;
644 pal |= blue & 0x000f;
645 }
646 if (regno == 0)
647 pal |= 0x2000;
648 palette[regno] = pal;
649 break;
650
651 case 8:
652 red >>= 4;
653 green >>= 8;
654 blue >>= 12;
655
656 pal = (red & 0x0f00);
657 pal |= (green & 0x00f0);
658 pal |= (blue & 0x000f);
659
660 if (palette[regno] != pal) {
661 update_hw = 1;
662 palette[regno] = pal;
663 }
664 break;
665 }
666 break;
667 }
668
669 /* Truecolor has hardware independent palette */
670 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
671 u32 v;
672
673 if (regno > 15)
674 return -EINVAL;
675
676 v = (red << info->var.red.offset) |
677 (green << info->var.green.offset) |
678 (blue << info->var.blue.offset);
679
680 ((u32 *) (info->pseudo_palette))[regno] = v;
681 if (palette[0] != 0x4000) {
682 update_hw = 1;
683 palette[0] = 0x4000;
684 }
685 }
686
687 /* Update the palette in the h/w as needed. */
688 if (update_hw)
689 lcd_blit(LOAD_PALETTE, par);
690
691 return 0;
692 }
693 #undef CNVT_TOHW
694
695 static void da8xx_fb_lcd_reset(void)
696 {
697 /* DMA has to be disabled */
698 lcdc_write(0, LCD_DMA_CTRL_REG);
699 lcdc_write(0, LCD_RASTER_CTRL_REG);
700
701 if (lcd_revision == LCD_VERSION_2) {
702 lcdc_write(0, LCD_INT_ENABLE_SET_REG);
703 /* Write 1 to reset */
704 lcdc_write(LCD_CLK_MAIN_RESET, LCD_CLK_RESET_REG);
705 lcdc_write(0, LCD_CLK_RESET_REG);
706 }
707 }
708
709 static int da8xx_fb_config_clk_divider(struct da8xx_fb_par *par,
710 unsigned lcdc_clk_div,
711 unsigned lcdc_clk_rate)
712 {
713 int ret;
714
715 if (par->lcdc_clk_rate != lcdc_clk_rate) {
716 ret = clk_set_rate(par->lcdc_clk, lcdc_clk_rate);
717 if (IS_ERR_VALUE(ret)) {
718 dev_err(par->dev,
719 "unable to set clock rate at %u\n",
720 lcdc_clk_rate);
721 return ret;
722 }
723 par->lcdc_clk_rate = clk_get_rate(par->lcdc_clk);
724 }
725
726 /* Configure the LCD clock divisor. */
727 lcdc_write(LCD_CLK_DIVISOR(lcdc_clk_div) |
728 (LCD_RASTER_MODE & 0x1), LCD_CTRL_REG);
729
730 if (lcd_revision == LCD_VERSION_2)
731 lcdc_write(LCD_V2_DMA_CLK_EN | LCD_V2_LIDD_CLK_EN |
732 LCD_V2_CORE_CLK_EN, LCD_CLK_ENABLE_REG);
733
734 return 0;
735 }
736
737 static unsigned int da8xx_fb_calc_clk_divider(struct da8xx_fb_par *par,
738 unsigned pixclock,
739 unsigned *lcdc_clk_rate)
740 {
741 unsigned lcdc_clk_div;
742
743 pixclock = PICOS2KHZ(pixclock) * 1000;
744
745 *lcdc_clk_rate = par->lcdc_clk_rate;
746
747 if (pixclock < (*lcdc_clk_rate / CLK_MAX_DIV)) {
748 *lcdc_clk_rate = clk_round_rate(par->lcdc_clk,
749 pixclock * CLK_MAX_DIV);
750 lcdc_clk_div = CLK_MAX_DIV;
751 } else if (pixclock > (*lcdc_clk_rate / CLK_MIN_DIV)) {
752 *lcdc_clk_rate = clk_round_rate(par->lcdc_clk,
753 pixclock * CLK_MIN_DIV);
754 lcdc_clk_div = CLK_MIN_DIV;
755 } else {
756 lcdc_clk_div = *lcdc_clk_rate / pixclock;
757 }
758
759 return lcdc_clk_div;
760 }
761
762 static int da8xx_fb_calc_config_clk_divider(struct da8xx_fb_par *par,
763 struct fb_videomode *mode)
764 {
765 unsigned lcdc_clk_rate;
766 unsigned lcdc_clk_div = da8xx_fb_calc_clk_divider(par, mode->pixclock,
767 &lcdc_clk_rate);
768
769 return da8xx_fb_config_clk_divider(par, lcdc_clk_div, lcdc_clk_rate);
770 }
771
772 static unsigned da8xx_fb_round_clk(struct da8xx_fb_par *par,
773 unsigned pixclock)
774 {
775 unsigned lcdc_clk_div, lcdc_clk_rate;
776
777 lcdc_clk_div = da8xx_fb_calc_clk_divider(par, pixclock, &lcdc_clk_rate);
778 return KHZ2PICOS(lcdc_clk_rate / (1000 * lcdc_clk_div));
779 }
780
781 static int lcd_init(struct da8xx_fb_par *par, const struct lcd_ctrl_config *cfg,
782 struct fb_videomode *panel)
783 {
784 u32 bpp;
785 int ret = 0;
786
787 ret = da8xx_fb_calc_config_clk_divider(par, panel);
788 if (IS_ERR_VALUE(ret)) {
789 dev_err(par->dev, "unable to configure clock\n");
790 return ret;
791 }
792
793 if (panel->sync & FB_SYNC_CLK_INVERT)
794 lcdc_write((lcdc_read(LCD_RASTER_TIMING_2_REG) |
795 LCD_INVERT_PIXEL_CLOCK), LCD_RASTER_TIMING_2_REG);
796 else
797 lcdc_write((lcdc_read(LCD_RASTER_TIMING_2_REG) &
798 ~LCD_INVERT_PIXEL_CLOCK), LCD_RASTER_TIMING_2_REG);
799
800 /* Configure the DMA burst size and fifo threshold. */
801 ret = lcd_cfg_dma(cfg->dma_burst_sz, cfg->fifo_th);
802 if (ret < 0)
803 return ret;
804
805 /* Configure the vertical and horizontal sync properties. */
806 lcd_cfg_vertical_sync(panel->upper_margin, panel->vsync_len,
807 panel->lower_margin);
808 lcd_cfg_horizontal_sync(panel->left_margin, panel->hsync_len,
809 panel->right_margin);
810
811 /* Configure for disply */
812 ret = lcd_cfg_display(cfg, panel);
813 if (ret < 0)
814 return ret;
815
816 bpp = cfg->bpp;
817
818 if (bpp == 12)
819 bpp = 16;
820 ret = lcd_cfg_frame_buffer(par, (unsigned int)panel->xres,
821 (unsigned int)panel->yres, bpp,
822 cfg->raster_order);
823 if (ret < 0)
824 return ret;
825
826 /* Configure FDD */
827 lcdc_write((lcdc_read(LCD_RASTER_CTRL_REG) & 0xfff00fff) |
828 (cfg->fdd << 12), LCD_RASTER_CTRL_REG);
829
830 return 0;
831 }
832
833 /* IRQ handler for version 2 of LCDC */
834 static irqreturn_t lcdc_irq_handler_rev02(int irq, void *arg)
835 {
836 struct da8xx_fb_par *par = arg;
837 u32 stat = lcdc_read(LCD_MASKED_STAT_REG);
838
839 if ((stat & LCD_SYNC_LOST) && (stat & LCD_FIFO_UNDERFLOW)) {
840 lcd_disable_raster(DA8XX_FRAME_NOWAIT);
841 lcdc_write(stat, LCD_MASKED_STAT_REG);
842 lcd_enable_raster();
843 } else if (stat & LCD_PL_LOAD_DONE) {
844 /*
845 * Must disable raster before changing state of any control bit.
846 * And also must be disabled before clearing the PL loading
847 * interrupt via the following write to the status register. If
848 * this is done after then one gets multiple PL done interrupts.
849 */
850 lcd_disable_raster(DA8XX_FRAME_NOWAIT);
851
852 lcdc_write(stat, LCD_MASKED_STAT_REG);
853
854 /* Disable PL completion interrupt */
855 lcdc_write(LCD_V2_PL_INT_ENA, LCD_INT_ENABLE_CLR_REG);
856
857 /* Setup and start data loading mode */
858 lcd_blit(LOAD_DATA, par);
859 } else {
860 lcdc_write(stat, LCD_MASKED_STAT_REG);
861
862 if (stat & LCD_END_OF_FRAME0) {
863 par->which_dma_channel_done = 0;
864 lcdc_write(par->dma_start,
865 LCD_DMA_FRM_BUF_BASE_ADDR_0_REG);
866 lcdc_write(par->dma_end,
867 LCD_DMA_FRM_BUF_CEILING_ADDR_0_REG);
868 par->vsync_flag = 1;
869 wake_up_interruptible(&par->vsync_wait);
870 }
871
872 if (stat & LCD_END_OF_FRAME1) {
873 par->which_dma_channel_done = 1;
874 lcdc_write(par->dma_start,
875 LCD_DMA_FRM_BUF_BASE_ADDR_1_REG);
876 lcdc_write(par->dma_end,
877 LCD_DMA_FRM_BUF_CEILING_ADDR_1_REG);
878 par->vsync_flag = 1;
879 wake_up_interruptible(&par->vsync_wait);
880 }
881
882 /* Set only when controller is disabled and at the end of
883 * active frame
884 */
885 if (stat & BIT(0)) {
886 frame_done_flag = 1;
887 wake_up_interruptible(&frame_done_wq);
888 }
889 }
890
891 lcdc_write(0, LCD_END_OF_INT_IND_REG);
892 return IRQ_HANDLED;
893 }
894
895 /* IRQ handler for version 1 LCDC */
896 static irqreturn_t lcdc_irq_handler_rev01(int irq, void *arg)
897 {
898 struct da8xx_fb_par *par = arg;
899 u32 stat = lcdc_read(LCD_STAT_REG);
900 u32 reg_ras;
901
902 if ((stat & LCD_SYNC_LOST) && (stat & LCD_FIFO_UNDERFLOW)) {
903 lcd_disable_raster(DA8XX_FRAME_NOWAIT);
904 lcdc_write(stat, LCD_STAT_REG);
905 lcd_enable_raster();
906 } else if (stat & LCD_PL_LOAD_DONE) {
907 /*
908 * Must disable raster before changing state of any control bit.
909 * And also must be disabled before clearing the PL loading
910 * interrupt via the following write to the status register. If
911 * this is done after then one gets multiple PL done interrupts.
912 */
913 lcd_disable_raster(DA8XX_FRAME_NOWAIT);
914
915 lcdc_write(stat, LCD_STAT_REG);
916
917 /* Disable PL completion inerrupt */
918 reg_ras = lcdc_read(LCD_RASTER_CTRL_REG);
919 reg_ras &= ~LCD_V1_PL_INT_ENA;
920 lcdc_write(reg_ras, LCD_RASTER_CTRL_REG);
921
922 /* Setup and start data loading mode */
923 lcd_blit(LOAD_DATA, par);
924 } else {
925 lcdc_write(stat, LCD_STAT_REG);
926
927 if (stat & LCD_END_OF_FRAME0) {
928 par->which_dma_channel_done = 0;
929 lcdc_write(par->dma_start,
930 LCD_DMA_FRM_BUF_BASE_ADDR_0_REG);
931 lcdc_write(par->dma_end,
932 LCD_DMA_FRM_BUF_CEILING_ADDR_0_REG);
933 par->vsync_flag = 1;
934 wake_up_interruptible(&par->vsync_wait);
935 }
936
937 if (stat & LCD_END_OF_FRAME1) {
938 par->which_dma_channel_done = 1;
939 lcdc_write(par->dma_start,
940 LCD_DMA_FRM_BUF_BASE_ADDR_1_REG);
941 lcdc_write(par->dma_end,
942 LCD_DMA_FRM_BUF_CEILING_ADDR_1_REG);
943 par->vsync_flag = 1;
944 wake_up_interruptible(&par->vsync_wait);
945 }
946 }
947
948 return IRQ_HANDLED;
949 }
950
951 static int fb_check_var(struct fb_var_screeninfo *var,
952 struct fb_info *info)
953 {
954 int err = 0;
955 struct da8xx_fb_par *par = info->par;
956 int bpp = var->bits_per_pixel >> 3;
957 unsigned long line_size = var->xres_virtual * bpp;
958
959 if (var->bits_per_pixel > 16 && lcd_revision == LCD_VERSION_1)
960 return -EINVAL;
961
962 switch (var->bits_per_pixel) {
963 case 1:
964 case 8:
965 var->red.offset = 0;
966 var->red.length = 8;
967 var->green.offset = 0;
968 var->green.length = 8;
969 var->blue.offset = 0;
970 var->blue.length = 8;
971 var->transp.offset = 0;
972 var->transp.length = 0;
973 var->nonstd = 0;
974 break;
975 case 4:
976 var->red.offset = 0;
977 var->red.length = 4;
978 var->green.offset = 0;
979 var->green.length = 4;
980 var->blue.offset = 0;
981 var->blue.length = 4;
982 var->transp.offset = 0;
983 var->transp.length = 0;
984 var->nonstd = FB_NONSTD_REV_PIX_IN_B;
985 break;
986 case 16: /* RGB 565 */
987 var->red.offset = 11;
988 var->red.length = 5;
989 var->green.offset = 5;
990 var->green.length = 6;
991 var->blue.offset = 0;
992 var->blue.length = 5;
993 var->transp.offset = 0;
994 var->transp.length = 0;
995 var->nonstd = 0;
996 break;
997 case 24:
998 var->red.offset = 16;
999 var->red.length = 8;
1000 var->green.offset = 8;
1001 var->green.length = 8;
1002 var->blue.offset = 0;
1003 var->blue.length = 8;
1004 var->nonstd = 0;
1005 break;
1006 case 32:
1007 var->transp.offset = 24;
1008 var->transp.length = 8;
1009 var->red.offset = 16;
1010 var->red.length = 8;
1011 var->green.offset = 8;
1012 var->green.length = 8;
1013 var->blue.offset = 0;
1014 var->blue.length = 8;
1015 var->nonstd = 0;
1016 break;
1017 default:
1018 err = -EINVAL;
1019 }
1020
1021 var->red.msb_right = 0;
1022 var->green.msb_right = 0;
1023 var->blue.msb_right = 0;
1024 var->transp.msb_right = 0;
1025
1026 if (line_size * var->yres_virtual > par->vram_size)
1027 var->yres_virtual = par->vram_size / line_size;
1028
1029 if (var->yres > var->yres_virtual)
1030 var->yres = var->yres_virtual;
1031
1032 if (var->xres > var->xres_virtual)
1033 var->xres = var->xres_virtual;
1034
1035 if (var->xres + var->xoffset > var->xres_virtual)
1036 var->xoffset = var->xres_virtual - var->xres;
1037 if (var->yres + var->yoffset > var->yres_virtual)
1038 var->yoffset = var->yres_virtual - var->yres;
1039
1040 var->pixclock = da8xx_fb_round_clk(par, var->pixclock);
1041
1042 return err;
1043 }
1044
1045 #ifdef CONFIG_CPU_FREQ
1046 static int lcd_da8xx_cpufreq_transition(struct notifier_block *nb,
1047 unsigned long val, void *data)
1048 {
1049 struct da8xx_fb_par *par;
1050
1051 par = container_of(nb, struct da8xx_fb_par, freq_transition);
1052 if (val == CPUFREQ_POSTCHANGE) {
1053 if (par->lcdc_clk_rate != clk_get_rate(par->lcdc_clk)) {
1054 par->lcdc_clk_rate = clk_get_rate(par->lcdc_clk);
1055 lcd_disable_raster(DA8XX_FRAME_WAIT);
1056 da8xx_fb_calc_config_clk_divider(par, &par->mode);
1057 if (par->blank == FB_BLANK_UNBLANK)
1058 lcd_enable_raster();
1059 }
1060 }
1061
1062 return 0;
1063 }
1064
1065 static int lcd_da8xx_cpufreq_register(struct da8xx_fb_par *par)
1066 {
1067 par->freq_transition.notifier_call = lcd_da8xx_cpufreq_transition;
1068
1069 return cpufreq_register_notifier(&par->freq_transition,
1070 CPUFREQ_TRANSITION_NOTIFIER);
1071 }
1072
1073 static void lcd_da8xx_cpufreq_deregister(struct da8xx_fb_par *par)
1074 {
1075 cpufreq_unregister_notifier(&par->freq_transition,
1076 CPUFREQ_TRANSITION_NOTIFIER);
1077 }
1078 #endif
1079
1080 static int fb_remove(struct platform_device *dev)
1081 {
1082 struct fb_info *info = dev_get_drvdata(&dev->dev);
1083
1084 if (info) {
1085 struct da8xx_fb_par *par = info->par;
1086
1087 #ifdef CONFIG_CPU_FREQ
1088 lcd_da8xx_cpufreq_deregister(par);
1089 #endif
1090 if (par->panel_power_ctrl)
1091 par->panel_power_ctrl(0);
1092
1093 lcd_disable_raster(DA8XX_FRAME_WAIT);
1094 lcdc_write(0, LCD_RASTER_CTRL_REG);
1095
1096 /* disable DMA */
1097 lcdc_write(0, LCD_DMA_CTRL_REG);
1098
1099 unregister_framebuffer(info);
1100 fb_dealloc_cmap(&info->cmap);
1101 dma_free_coherent(NULL, PALETTE_SIZE, par->v_palette_base,
1102 par->p_palette_base);
1103 dma_free_coherent(NULL, par->vram_size, par->vram_virt,
1104 par->vram_phys);
1105 pm_runtime_put_sync(&dev->dev);
1106 pm_runtime_disable(&dev->dev);
1107 framebuffer_release(info);
1108
1109 }
1110 return 0;
1111 }
1112
1113 /*
1114 * Function to wait for vertical sync which for this LCD peripheral
1115 * translates into waiting for the current raster frame to complete.
1116 */
1117 static int fb_wait_for_vsync(struct fb_info *info)
1118 {
1119 struct da8xx_fb_par *par = info->par;
1120 int ret;
1121
1122 /*
1123 * Set flag to 0 and wait for isr to set to 1. It would seem there is a
1124 * race condition here where the ISR could have occurred just before or
1125 * just after this set. But since we are just coarsely waiting for
1126 * a frame to complete then that's OK. i.e. if the frame completed
1127 * just before this code executed then we have to wait another full
1128 * frame time but there is no way to avoid such a situation. On the
1129 * other hand if the frame completed just after then we don't need
1130 * to wait long at all. Either way we are guaranteed to return to the
1131 * user immediately after a frame completion which is all that is
1132 * required.
1133 */
1134 par->vsync_flag = 0;
1135 ret = wait_event_interruptible_timeout(par->vsync_wait,
1136 par->vsync_flag != 0,
1137 par->vsync_timeout);
1138 if (ret < 0)
1139 return ret;
1140 if (ret == 0)
1141 return -ETIMEDOUT;
1142
1143 return 0;
1144 }
1145
1146 static int fb_ioctl(struct fb_info *info, unsigned int cmd,
1147 unsigned long arg)
1148 {
1149 struct lcd_sync_arg sync_arg;
1150
1151 switch (cmd) {
1152 case FBIOGET_CONTRAST:
1153 case FBIOPUT_CONTRAST:
1154 case FBIGET_BRIGHTNESS:
1155 case FBIPUT_BRIGHTNESS:
1156 case FBIGET_COLOR:
1157 case FBIPUT_COLOR:
1158 return -ENOTTY;
1159 case FBIPUT_HSYNC:
1160 if (copy_from_user(&sync_arg, (char *)arg,
1161 sizeof(struct lcd_sync_arg)))
1162 return -EFAULT;
1163 lcd_cfg_horizontal_sync(sync_arg.back_porch,
1164 sync_arg.pulse_width,
1165 sync_arg.front_porch);
1166 break;
1167 case FBIPUT_VSYNC:
1168 if (copy_from_user(&sync_arg, (char *)arg,
1169 sizeof(struct lcd_sync_arg)))
1170 return -EFAULT;
1171 lcd_cfg_vertical_sync(sync_arg.back_porch,
1172 sync_arg.pulse_width,
1173 sync_arg.front_porch);
1174 break;
1175 case FBIO_WAITFORVSYNC:
1176 return fb_wait_for_vsync(info);
1177 default:
1178 return -EINVAL;
1179 }
1180 return 0;
1181 }
1182
1183 static int cfb_blank(int blank, struct fb_info *info)
1184 {
1185 struct da8xx_fb_par *par = info->par;
1186 int ret = 0;
1187
1188 if (par->blank == blank)
1189 return 0;
1190
1191 par->blank = blank;
1192 switch (blank) {
1193 case FB_BLANK_UNBLANK:
1194 lcd_enable_raster();
1195
1196 if (par->panel_power_ctrl)
1197 par->panel_power_ctrl(1);
1198 break;
1199 case FB_BLANK_NORMAL:
1200 case FB_BLANK_VSYNC_SUSPEND:
1201 case FB_BLANK_HSYNC_SUSPEND:
1202 case FB_BLANK_POWERDOWN:
1203 if (par->panel_power_ctrl)
1204 par->panel_power_ctrl(0);
1205
1206 lcd_disable_raster(DA8XX_FRAME_WAIT);
1207 break;
1208 default:
1209 ret = -EINVAL;
1210 }
1211
1212 return ret;
1213 }
1214
1215 /*
1216 * Set new x,y offsets in the virtual display for the visible area and switch
1217 * to the new mode.
1218 */
1219 static int da8xx_pan_display(struct fb_var_screeninfo *var,
1220 struct fb_info *fbi)
1221 {
1222 int ret = 0;
1223 struct fb_var_screeninfo new_var;
1224 struct da8xx_fb_par *par = fbi->par;
1225 struct fb_fix_screeninfo *fix = &fbi->fix;
1226 unsigned int end;
1227 unsigned int start;
1228 unsigned long irq_flags;
1229
1230 if (var->xoffset != fbi->var.xoffset ||
1231 var->yoffset != fbi->var.yoffset) {
1232 memcpy(&new_var, &fbi->var, sizeof(new_var));
1233 new_var.xoffset = var->xoffset;
1234 new_var.yoffset = var->yoffset;
1235 if (fb_check_var(&new_var, fbi))
1236 ret = -EINVAL;
1237 else {
1238 memcpy(&fbi->var, &new_var, sizeof(new_var));
1239
1240 start = fix->smem_start +
1241 new_var.yoffset * fix->line_length +
1242 new_var.xoffset * fbi->var.bits_per_pixel / 8;
1243 end = start + fbi->var.yres * fix->line_length - 1;
1244 par->dma_start = start;
1245 par->dma_end = end;
1246 spin_lock_irqsave(&par->lock_for_chan_update,
1247 irq_flags);
1248 if (par->which_dma_channel_done == 0) {
1249 lcdc_write(par->dma_start,
1250 LCD_DMA_FRM_BUF_BASE_ADDR_0_REG);
1251 lcdc_write(par->dma_end,
1252 LCD_DMA_FRM_BUF_CEILING_ADDR_0_REG);
1253 } else if (par->which_dma_channel_done == 1) {
1254 lcdc_write(par->dma_start,
1255 LCD_DMA_FRM_BUF_BASE_ADDR_1_REG);
1256 lcdc_write(par->dma_end,
1257 LCD_DMA_FRM_BUF_CEILING_ADDR_1_REG);
1258 }
1259 spin_unlock_irqrestore(&par->lock_for_chan_update,
1260 irq_flags);
1261 }
1262 }
1263
1264 return ret;
1265 }
1266
1267 static int da8xxfb_set_par(struct fb_info *info)
1268 {
1269 struct da8xx_fb_par *par = info->par;
1270 int ret;
1271 bool raster = da8xx_fb_is_raster_enabled();
1272
1273 if (raster)
1274 lcd_disable_raster(DA8XX_FRAME_WAIT);
1275
1276 fb_var_to_videomode(&par->mode, &info->var);
1277
1278 par->cfg.bpp = info->var.bits_per_pixel;
1279
1280 info->fix.visual = (par->cfg.bpp <= 8) ?
1281 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
1282 info->fix.line_length = (par->mode.xres * par->cfg.bpp) / 8;
1283
1284 ret = lcd_init(par, &par->cfg, &par->mode);
1285 if (ret < 0) {
1286 dev_err(par->dev, "lcd init failed\n");
1287 return ret;
1288 }
1289
1290 par->dma_start = info->fix.smem_start +
1291 info->var.yoffset * info->fix.line_length +
1292 info->var.xoffset * info->var.bits_per_pixel / 8;
1293 par->dma_end = par->dma_start +
1294 info->var.yres * info->fix.line_length - 1;
1295
1296 lcdc_write(par->dma_start, LCD_DMA_FRM_BUF_BASE_ADDR_0_REG);
1297 lcdc_write(par->dma_end, LCD_DMA_FRM_BUF_CEILING_ADDR_0_REG);
1298 lcdc_write(par->dma_start, LCD_DMA_FRM_BUF_BASE_ADDR_1_REG);
1299 lcdc_write(par->dma_end, LCD_DMA_FRM_BUF_CEILING_ADDR_1_REG);
1300
1301 if (raster)
1302 lcd_enable_raster();
1303
1304 return 0;
1305 }
1306
1307 static struct fb_ops da8xx_fb_ops = {
1308 .owner = THIS_MODULE,
1309 .fb_check_var = fb_check_var,
1310 .fb_set_par = da8xxfb_set_par,
1311 .fb_setcolreg = fb_setcolreg,
1312 .fb_pan_display = da8xx_pan_display,
1313 .fb_ioctl = fb_ioctl,
1314 .fb_fillrect = cfb_fillrect,
1315 .fb_copyarea = cfb_copyarea,
1316 .fb_imageblit = cfb_imageblit,
1317 .fb_blank = cfb_blank,
1318 };
1319
1320 static struct fb_videomode *da8xx_fb_get_videomode(struct platform_device *dev)
1321 {
1322 struct da8xx_lcdc_platform_data *fb_pdata = dev_get_platdata(&dev->dev);
1323 struct fb_videomode *lcdc_info;
1324 int i;
1325
1326 for (i = 0, lcdc_info = known_lcd_panels;
1327 i < ARRAY_SIZE(known_lcd_panels); i++, lcdc_info++) {
1328 if (strcmp(fb_pdata->type, lcdc_info->name) == 0)
1329 break;
1330 }
1331
1332 if (i == ARRAY_SIZE(known_lcd_panels)) {
1333 dev_err(&dev->dev, "no panel found\n");
1334 return NULL;
1335 }
1336 dev_info(&dev->dev, "found %s panel\n", lcdc_info->name);
1337
1338 return lcdc_info;
1339 }
1340
1341 static int fb_probe(struct platform_device *device)
1342 {
1343 struct da8xx_lcdc_platform_data *fb_pdata =
1344 dev_get_platdata(&device->dev);
1345 static struct resource *lcdc_regs;
1346 struct lcd_ctrl_config *lcd_cfg;
1347 struct fb_videomode *lcdc_info;
1348 struct fb_info *da8xx_fb_info;
1349 struct da8xx_fb_par *par;
1350 struct clk *tmp_lcdc_clk;
1351 int ret;
1352 unsigned long ulcm;
1353
1354 if (fb_pdata == NULL) {
1355 dev_err(&device->dev, "Can not get platform data\n");
1356 return -ENOENT;
1357 }
1358
1359 lcdc_info = da8xx_fb_get_videomode(device);
1360 if (lcdc_info == NULL)
1361 return -ENODEV;
1362
1363 lcdc_regs = platform_get_resource(device, IORESOURCE_MEM, 0);
1364 da8xx_fb_reg_base = devm_ioremap_resource(&device->dev, lcdc_regs);
1365 if (IS_ERR(da8xx_fb_reg_base))
1366 return PTR_ERR(da8xx_fb_reg_base);
1367
1368 tmp_lcdc_clk = devm_clk_get(&device->dev, "fck");
1369 if (IS_ERR(tmp_lcdc_clk)) {
1370 dev_err(&device->dev, "Can not get device clock\n");
1371 return PTR_ERR(tmp_lcdc_clk);
1372 }
1373
1374 pm_runtime_enable(&device->dev);
1375 pm_runtime_get_sync(&device->dev);
1376
1377 /* Determine LCD IP Version */
1378 switch (lcdc_read(LCD_PID_REG)) {
1379 case 0x4C100102:
1380 lcd_revision = LCD_VERSION_1;
1381 break;
1382 case 0x4F200800:
1383 case 0x4F201000:
1384 lcd_revision = LCD_VERSION_2;
1385 break;
1386 default:
1387 dev_warn(&device->dev, "Unknown PID Reg value 0x%x, "
1388 "defaulting to LCD revision 1\n",
1389 lcdc_read(LCD_PID_REG));
1390 lcd_revision = LCD_VERSION_1;
1391 break;
1392 }
1393
1394 lcd_cfg = (struct lcd_ctrl_config *)fb_pdata->controller_data;
1395
1396 if (!lcd_cfg) {
1397 ret = -EINVAL;
1398 goto err_pm_runtime_disable;
1399 }
1400
1401 da8xx_fb_info = framebuffer_alloc(sizeof(struct da8xx_fb_par),
1402 &device->dev);
1403 if (!da8xx_fb_info) {
1404 dev_dbg(&device->dev, "Memory allocation failed for fb_info\n");
1405 ret = -ENOMEM;
1406 goto err_pm_runtime_disable;
1407 }
1408
1409 par = da8xx_fb_info->par;
1410 par->dev = &device->dev;
1411 par->lcdc_clk = tmp_lcdc_clk;
1412 par->lcdc_clk_rate = clk_get_rate(par->lcdc_clk);
1413 if (fb_pdata->panel_power_ctrl) {
1414 par->panel_power_ctrl = fb_pdata->panel_power_ctrl;
1415 par->panel_power_ctrl(1);
1416 }
1417
1418 fb_videomode_to_var(&da8xx_fb_var, lcdc_info);
1419 par->cfg = *lcd_cfg;
1420
1421 da8xx_fb_lcd_reset();
1422
1423 /* allocate frame buffer */
1424 par->vram_size = lcdc_info->xres * lcdc_info->yres * lcd_cfg->bpp;
1425 ulcm = lcm((lcdc_info->xres * lcd_cfg->bpp)/8, PAGE_SIZE);
1426 par->vram_size = roundup(par->vram_size/8, ulcm);
1427 par->vram_size = par->vram_size * LCD_NUM_BUFFERS;
1428
1429 par->vram_virt = dma_alloc_coherent(NULL,
1430 par->vram_size,
1431 (resource_size_t *) &par->vram_phys,
1432 GFP_KERNEL | GFP_DMA);
1433 if (!par->vram_virt) {
1434 dev_err(&device->dev,
1435 "GLCD: kmalloc for frame buffer failed\n");
1436 ret = -EINVAL;
1437 goto err_release_fb;
1438 }
1439
1440 da8xx_fb_info->screen_base = (char __iomem *) par->vram_virt;
1441 da8xx_fb_fix.smem_start = par->vram_phys;
1442 da8xx_fb_fix.smem_len = par->vram_size;
1443 da8xx_fb_fix.line_length = (lcdc_info->xres * lcd_cfg->bpp) / 8;
1444
1445 par->dma_start = par->vram_phys;
1446 par->dma_end = par->dma_start + lcdc_info->yres *
1447 da8xx_fb_fix.line_length - 1;
1448
1449 /* allocate palette buffer */
1450 par->v_palette_base = dma_zalloc_coherent(NULL, PALETTE_SIZE,
1451 (resource_size_t *)&par->p_palette_base,
1452 GFP_KERNEL | GFP_DMA);
1453 if (!par->v_palette_base) {
1454 dev_err(&device->dev,
1455 "GLCD: kmalloc for palette buffer failed\n");
1456 ret = -EINVAL;
1457 goto err_release_fb_mem;
1458 }
1459
1460 par->irq = platform_get_irq(device, 0);
1461 if (par->irq < 0) {
1462 ret = -ENOENT;
1463 goto err_release_pl_mem;
1464 }
1465
1466 da8xx_fb_var.grayscale =
1467 lcd_cfg->panel_shade == MONOCHROME ? 1 : 0;
1468 da8xx_fb_var.bits_per_pixel = lcd_cfg->bpp;
1469
1470 /* Initialize fbinfo */
1471 da8xx_fb_info->flags = FBINFO_FLAG_DEFAULT;
1472 da8xx_fb_info->fix = da8xx_fb_fix;
1473 da8xx_fb_info->var = da8xx_fb_var;
1474 da8xx_fb_info->fbops = &da8xx_fb_ops;
1475 da8xx_fb_info->pseudo_palette = par->pseudo_palette;
1476 da8xx_fb_info->fix.visual = (da8xx_fb_info->var.bits_per_pixel <= 8) ?
1477 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
1478
1479 ret = fb_alloc_cmap(&da8xx_fb_info->cmap, PALETTE_SIZE, 0);
1480 if (ret)
1481 goto err_release_pl_mem;
1482 da8xx_fb_info->cmap.len = par->palette_sz;
1483
1484 /* initialize var_screeninfo */
1485 da8xx_fb_var.activate = FB_ACTIVATE_FORCE;
1486 fb_set_var(da8xx_fb_info, &da8xx_fb_var);
1487
1488 dev_set_drvdata(&device->dev, da8xx_fb_info);
1489
1490 /* initialize the vsync wait queue */
1491 init_waitqueue_head(&par->vsync_wait);
1492 par->vsync_timeout = HZ / 5;
1493 par->which_dma_channel_done = -1;
1494 spin_lock_init(&par->lock_for_chan_update);
1495
1496 /* Register the Frame Buffer */
1497 if (register_framebuffer(da8xx_fb_info) < 0) {
1498 dev_err(&device->dev,
1499 "GLCD: Frame Buffer Registration Failed!\n");
1500 ret = -EINVAL;
1501 goto err_dealloc_cmap;
1502 }
1503
1504 #ifdef CONFIG_CPU_FREQ
1505 ret = lcd_da8xx_cpufreq_register(par);
1506 if (ret) {
1507 dev_err(&device->dev, "failed to register cpufreq\n");
1508 goto err_cpu_freq;
1509 }
1510 #endif
1511
1512 if (lcd_revision == LCD_VERSION_1)
1513 lcdc_irq_handler = lcdc_irq_handler_rev01;
1514 else {
1515 init_waitqueue_head(&frame_done_wq);
1516 lcdc_irq_handler = lcdc_irq_handler_rev02;
1517 }
1518
1519 ret = devm_request_irq(&device->dev, par->irq, lcdc_irq_handler, 0,
1520 DRIVER_NAME, par);
1521 if (ret)
1522 goto irq_freq;
1523 return 0;
1524
1525 irq_freq:
1526 #ifdef CONFIG_CPU_FREQ
1527 lcd_da8xx_cpufreq_deregister(par);
1528 err_cpu_freq:
1529 #endif
1530 unregister_framebuffer(da8xx_fb_info);
1531
1532 err_dealloc_cmap:
1533 fb_dealloc_cmap(&da8xx_fb_info->cmap);
1534
1535 err_release_pl_mem:
1536 dma_free_coherent(NULL, PALETTE_SIZE, par->v_palette_base,
1537 par->p_palette_base);
1538
1539 err_release_fb_mem:
1540 dma_free_coherent(NULL, par->vram_size, par->vram_virt, par->vram_phys);
1541
1542 err_release_fb:
1543 framebuffer_release(da8xx_fb_info);
1544
1545 err_pm_runtime_disable:
1546 pm_runtime_put_sync(&device->dev);
1547 pm_runtime_disable(&device->dev);
1548
1549 return ret;
1550 }
1551
1552 #ifdef CONFIG_PM_SLEEP
1553 static struct lcdc_context {
1554 u32 clk_enable;
1555 u32 ctrl;
1556 u32 dma_ctrl;
1557 u32 raster_timing_0;
1558 u32 raster_timing_1;
1559 u32 raster_timing_2;
1560 u32 int_enable_set;
1561 u32 dma_frm_buf_base_addr_0;
1562 u32 dma_frm_buf_ceiling_addr_0;
1563 u32 dma_frm_buf_base_addr_1;
1564 u32 dma_frm_buf_ceiling_addr_1;
1565 u32 raster_ctrl;
1566 } reg_context;
1567
1568 static void lcd_context_save(void)
1569 {
1570 if (lcd_revision == LCD_VERSION_2) {
1571 reg_context.clk_enable = lcdc_read(LCD_CLK_ENABLE_REG);
1572 reg_context.int_enable_set = lcdc_read(LCD_INT_ENABLE_SET_REG);
1573 }
1574
1575 reg_context.ctrl = lcdc_read(LCD_CTRL_REG);
1576 reg_context.dma_ctrl = lcdc_read(LCD_DMA_CTRL_REG);
1577 reg_context.raster_timing_0 = lcdc_read(LCD_RASTER_TIMING_0_REG);
1578 reg_context.raster_timing_1 = lcdc_read(LCD_RASTER_TIMING_1_REG);
1579 reg_context.raster_timing_2 = lcdc_read(LCD_RASTER_TIMING_2_REG);
1580 reg_context.dma_frm_buf_base_addr_0 =
1581 lcdc_read(LCD_DMA_FRM_BUF_BASE_ADDR_0_REG);
1582 reg_context.dma_frm_buf_ceiling_addr_0 =
1583 lcdc_read(LCD_DMA_FRM_BUF_CEILING_ADDR_0_REG);
1584 reg_context.dma_frm_buf_base_addr_1 =
1585 lcdc_read(LCD_DMA_FRM_BUF_BASE_ADDR_1_REG);
1586 reg_context.dma_frm_buf_ceiling_addr_1 =
1587 lcdc_read(LCD_DMA_FRM_BUF_CEILING_ADDR_1_REG);
1588 reg_context.raster_ctrl = lcdc_read(LCD_RASTER_CTRL_REG);
1589 return;
1590 }
1591
1592 static void lcd_context_restore(void)
1593 {
1594 if (lcd_revision == LCD_VERSION_2) {
1595 lcdc_write(reg_context.clk_enable, LCD_CLK_ENABLE_REG);
1596 lcdc_write(reg_context.int_enable_set, LCD_INT_ENABLE_SET_REG);
1597 }
1598
1599 lcdc_write(reg_context.ctrl, LCD_CTRL_REG);
1600 lcdc_write(reg_context.dma_ctrl, LCD_DMA_CTRL_REG);
1601 lcdc_write(reg_context.raster_timing_0, LCD_RASTER_TIMING_0_REG);
1602 lcdc_write(reg_context.raster_timing_1, LCD_RASTER_TIMING_1_REG);
1603 lcdc_write(reg_context.raster_timing_2, LCD_RASTER_TIMING_2_REG);
1604 lcdc_write(reg_context.dma_frm_buf_base_addr_0,
1605 LCD_DMA_FRM_BUF_BASE_ADDR_0_REG);
1606 lcdc_write(reg_context.dma_frm_buf_ceiling_addr_0,
1607 LCD_DMA_FRM_BUF_CEILING_ADDR_0_REG);
1608 lcdc_write(reg_context.dma_frm_buf_base_addr_1,
1609 LCD_DMA_FRM_BUF_BASE_ADDR_1_REG);
1610 lcdc_write(reg_context.dma_frm_buf_ceiling_addr_1,
1611 LCD_DMA_FRM_BUF_CEILING_ADDR_1_REG);
1612 lcdc_write(reg_context.raster_ctrl, LCD_RASTER_CTRL_REG);
1613 return;
1614 }
1615
1616 static int fb_suspend(struct device *dev)
1617 {
1618 struct fb_info *info = dev_get_drvdata(dev);
1619 struct da8xx_fb_par *par = info->par;
1620
1621 console_lock();
1622 if (par->panel_power_ctrl)
1623 par->panel_power_ctrl(0);
1624
1625 fb_set_suspend(info, 1);
1626 lcd_disable_raster(DA8XX_FRAME_WAIT);
1627 lcd_context_save();
1628 pm_runtime_put_sync(dev);
1629 console_unlock();
1630
1631 return 0;
1632 }
1633 static int fb_resume(struct device *dev)
1634 {
1635 struct fb_info *info = dev_get_drvdata(dev);
1636 struct da8xx_fb_par *par = info->par;
1637
1638 console_lock();
1639 pm_runtime_get_sync(dev);
1640 lcd_context_restore();
1641 if (par->blank == FB_BLANK_UNBLANK) {
1642 lcd_enable_raster();
1643
1644 if (par->panel_power_ctrl)
1645 par->panel_power_ctrl(1);
1646 }
1647
1648 fb_set_suspend(info, 0);
1649 console_unlock();
1650
1651 return 0;
1652 }
1653 #endif
1654
1655 static SIMPLE_DEV_PM_OPS(fb_pm_ops, fb_suspend, fb_resume);
1656
1657 static struct platform_driver da8xx_fb_driver = {
1658 .probe = fb_probe,
1659 .remove = fb_remove,
1660 .driver = {
1661 .name = DRIVER_NAME,
1662 .pm = &fb_pm_ops,
1663 },
1664 };
1665 module_platform_driver(da8xx_fb_driver);
1666
1667 MODULE_DESCRIPTION("Framebuffer driver for TI da8xx/omap-l1xx");
1668 MODULE_AUTHOR("Texas Instruments");
1669 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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