1 /*
2 * Freescale i.MX Frame Buffer device driver
3 *
4 * Copyright (C) 2004 Sascha Hauer, Pengutronix
5 * Based on acornfb.c Copyright (C) Russell King.
6 *
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License. See the file COPYING in the main directory of this archive for
9 * more details.
10 *
11 * Please direct your questions and comments on this driver to the following
12 * email address:
13 *
14 * linux-arm-kernel@lists.arm.linux.org.uk
15 */
16
17 #include <linux/module.h>
18 #include <linux/kernel.h>
19 #include <linux/errno.h>
20 #include <linux/string.h>
21 #include <linux/interrupt.h>
22 #include <linux/slab.h>
23 #include <linux/mm.h>
24 #include <linux/fb.h>
25 #include <linux/delay.h>
26 #include <linux/init.h>
27 #include <linux/ioport.h>
28 #include <linux/cpufreq.h>
29 #include <linux/clk.h>
30 #include <linux/platform_device.h>
31 #include <linux/dma-mapping.h>
32 #include <linux/io.h>
33 #include <linux/math64.h>
34
35 #include <linux/platform_data/video-imxfb.h>
36
37 /*
38 * Complain if VAR is out of range.
39 */
40 #define DEBUG_VAR 1
41
42 #if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || \
43 (defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE) && \
44 defined(CONFIG_FB_IMX_MODULE))
45 #define PWMR_BACKLIGHT_AVAILABLE
46 #endif
47
48 #define DRIVER_NAME "imx-fb"
49
50 #define LCDC_SSA 0x00
51
52 #define LCDC_SIZE 0x04
53 #define SIZE_XMAX(x) ((((x) >> 4) & 0x3f) << 20)
54
55 #define YMAX_MASK_IMX1 0x1ff
56 #define YMAX_MASK_IMX21 0x3ff
57
58 #define LCDC_VPW 0x08
59 #define VPW_VPW(x) ((x) & 0x3ff)
60
61 #define LCDC_CPOS 0x0C
62 #define CPOS_CC1 (1<<31)
63 #define CPOS_CC0 (1<<30)
64 #define CPOS_OP (1<<28)
65 #define CPOS_CXP(x) (((x) & 3ff) << 16)
66
67 #define LCDC_LCWHB 0x10
68 #define LCWHB_BK_EN (1<<31)
69 #define LCWHB_CW(w) (((w) & 0x1f) << 24)
70 #define LCWHB_CH(h) (((h) & 0x1f) << 16)
71 #define LCWHB_BD(x) ((x) & 0xff)
72
73 #define LCDC_LCHCC 0x14
74
75 #define LCDC_PCR 0x18
76
77 #define LCDC_HCR 0x1C
78 #define HCR_H_WIDTH(x) (((x) & 0x3f) << 26)
79 #define HCR_H_WAIT_1(x) (((x) & 0xff) << 8)
80 #define HCR_H_WAIT_2(x) ((x) & 0xff)
81
82 #define LCDC_VCR 0x20
83 #define VCR_V_WIDTH(x) (((x) & 0x3f) << 26)
84 #define VCR_V_WAIT_1(x) (((x) & 0xff) << 8)
85 #define VCR_V_WAIT_2(x) ((x) & 0xff)
86
87 #define LCDC_POS 0x24
88 #define POS_POS(x) ((x) & 1f)
89
90 #define LCDC_LSCR1 0x28
91 /* bit fields in imxfb.h */
92
93 #define LCDC_PWMR 0x2C
94 /* bit fields in imxfb.h */
95
96 #define LCDC_DMACR 0x30
97 /* bit fields in imxfb.h */
98
99 #define LCDC_RMCR 0x34
100
101 #define RMCR_LCDC_EN_MX1 (1<<1)
102
103 #define RMCR_SELF_REF (1<<0)
104
105 #define LCDC_LCDICR 0x38
106 #define LCDICR_INT_SYN (1<<2)
107 #define LCDICR_INT_CON (1)
108
109 #define LCDC_LCDISR 0x40
110 #define LCDISR_UDR_ERR (1<<3)
111 #define LCDISR_ERR_RES (1<<2)
112 #define LCDISR_EOF (1<<1)
113 #define LCDISR_BOF (1<<0)
114
115 /* Used fb-mode. Can be set on kernel command line, therefore file-static. */
116 static const char *fb_mode;
117
118
119 /*
120 * These are the bitfields for each
121 * display depth that we support.
122 */
123 struct imxfb_rgb {
124 struct fb_bitfield red;
125 struct fb_bitfield green;
126 struct fb_bitfield blue;
127 struct fb_bitfield transp;
128 };
129
130 enum imxfb_type {
131 IMX1_FB,
132 IMX21_FB,
133 };
134
135 struct imxfb_info {
136 struct platform_device *pdev;
137 void __iomem *regs;
138 struct clk *clk_ipg;
139 struct clk *clk_ahb;
140 struct clk *clk_per;
141 enum imxfb_type devtype;
142 bool enabled;
143
144 /*
145 * These are the addresses we mapped
146 * the framebuffer memory region to.
147 */
148 dma_addr_t map_dma;
149 u_char *map_cpu;
150 u_int map_size;
151
152 u_char *screen_cpu;
153 dma_addr_t screen_dma;
154 u_int palette_size;
155
156 dma_addr_t dbar1;
157 dma_addr_t dbar2;
158
159 u_int pcr;
160 u_int pwmr;
161 u_int lscr1;
162 u_int dmacr;
163 u_int cmap_inverse:1,
164 cmap_static:1,
165 unused:30;
166
167 struct imx_fb_videomode *mode;
168 int num_modes;
169 #ifdef PWMR_BACKLIGHT_AVAILABLE
170 struct backlight_device *bl;
171 #endif
172
173 void (*lcd_power)(int);
174 void (*backlight_power)(int);
175 };
176
177 static struct platform_device_id imxfb_devtype[] = {
178 {
179 .name = "imx1-fb",
180 .driver_data = IMX1_FB,
181 }, {
182 .name = "imx21-fb",
183 .driver_data = IMX21_FB,
184 }, {
185 /* sentinel */
186 }
187 };
188 MODULE_DEVICE_TABLE(platform, imxfb_devtype);
189
is_imx1_fb(struct imxfb_info * fbi)190 static inline int is_imx1_fb(struct imxfb_info *fbi)
191 {
192 return fbi->devtype == IMX1_FB;
193 }
194
195 #define IMX_NAME "IMX"
196
197 /*
198 * Minimum X and Y resolutions
199 */
200 #define MIN_XRES 64
201 #define MIN_YRES 64
202
203 /* Actually this really is 18bit support, the lowest 2 bits of each colour
204 * are unused in hardware. We claim to have 24bit support to make software
205 * like X work, which does not support 18bit.
206 */
207 static struct imxfb_rgb def_rgb_18 = {
208 .red = {.offset = 16, .length = 8,},
209 .green = {.offset = 8, .length = 8,},
210 .blue = {.offset = 0, .length = 8,},
211 .transp = {.offset = 0, .length = 0,},
212 };
213
214 static struct imxfb_rgb def_rgb_16_tft = {
215 .red = {.offset = 11, .length = 5,},
216 .green = {.offset = 5, .length = 6,},
217 .blue = {.offset = 0, .length = 5,},
218 .transp = {.offset = 0, .length = 0,},
219 };
220
221 static struct imxfb_rgb def_rgb_16_stn = {
222 .red = {.offset = 8, .length = 4,},
223 .green = {.offset = 4, .length = 4,},
224 .blue = {.offset = 0, .length = 4,},
225 .transp = {.offset = 0, .length = 0,},
226 };
227
228 static struct imxfb_rgb def_rgb_8 = {
229 .red = {.offset = 0, .length = 8,},
230 .green = {.offset = 0, .length = 8,},
231 .blue = {.offset = 0, .length = 8,},
232 .transp = {.offset = 0, .length = 0,},
233 };
234
235 static int imxfb_activate_var(struct fb_var_screeninfo *var,
236 struct fb_info *info);
237
chan_to_field(u_int chan,struct fb_bitfield * bf)238 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
239 {
240 chan &= 0xffff;
241 chan >>= 16 - bf->length;
242 return chan << bf->offset;
243 }
244
imxfb_setpalettereg(u_int regno,u_int red,u_int green,u_int blue,u_int trans,struct fb_info * info)245 static int imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
246 u_int trans, struct fb_info *info)
247 {
248 struct imxfb_info *fbi = info->par;
249 u_int val, ret = 1;
250
251 #define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
252 if (regno < fbi->palette_size) {
253 val = (CNVT_TOHW(red, 4) << 8) |
254 (CNVT_TOHW(green,4) << 4) |
255 CNVT_TOHW(blue, 4);
256
257 writel(val, fbi->regs + 0x800 + (regno << 2));
258 ret = 0;
259 }
260 return ret;
261 }
262
imxfb_setcolreg(u_int regno,u_int red,u_int green,u_int blue,u_int trans,struct fb_info * info)263 static int imxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
264 u_int trans, struct fb_info *info)
265 {
266 struct imxfb_info *fbi = info->par;
267 unsigned int val;
268 int ret = 1;
269
270 /*
271 * If inverse mode was selected, invert all the colours
272 * rather than the register number. The register number
273 * is what you poke into the framebuffer to produce the
274 * colour you requested.
275 */
276 if (fbi->cmap_inverse) {
277 red = 0xffff - red;
278 green = 0xffff - green;
279 blue = 0xffff - blue;
280 }
281
282 /*
283 * If greyscale is true, then we convert the RGB value
284 * to greyscale no mater what visual we are using.
285 */
286 if (info->var.grayscale)
287 red = green = blue = (19595 * red + 38470 * green +
288 7471 * blue) >> 16;
289
290 switch (info->fix.visual) {
291 case FB_VISUAL_TRUECOLOR:
292 /*
293 * 12 or 16-bit True Colour. We encode the RGB value
294 * according to the RGB bitfield information.
295 */
296 if (regno < 16) {
297 u32 *pal = info->pseudo_palette;
298
299 val = chan_to_field(red, &info->var.red);
300 val |= chan_to_field(green, &info->var.green);
301 val |= chan_to_field(blue, &info->var.blue);
302
303 pal[regno] = val;
304 ret = 0;
305 }
306 break;
307
308 case FB_VISUAL_STATIC_PSEUDOCOLOR:
309 case FB_VISUAL_PSEUDOCOLOR:
310 ret = imxfb_setpalettereg(regno, red, green, blue, trans, info);
311 break;
312 }
313
314 return ret;
315 }
316
imxfb_find_mode(struct imxfb_info * fbi)317 static const struct imx_fb_videomode *imxfb_find_mode(struct imxfb_info *fbi)
318 {
319 struct imx_fb_videomode *m;
320 int i;
321
322 for (i = 0, m = &fbi->mode[0]; i < fbi->num_modes; i++, m++) {
323 if (!strcmp(m->mode.name, fb_mode))
324 return m;
325 }
326 return NULL;
327 }
328
329 /*
330 * imxfb_check_var():
331 * Round up in the following order: bits_per_pixel, xres,
332 * yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
333 * bitfields, horizontal timing, vertical timing.
334 */
imxfb_check_var(struct fb_var_screeninfo * var,struct fb_info * info)335 static int imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
336 {
337 struct imxfb_info *fbi = info->par;
338 struct imxfb_rgb *rgb;
339 const struct imx_fb_videomode *imxfb_mode;
340 unsigned long lcd_clk;
341 unsigned long long tmp;
342 u32 pcr = 0;
343
344 if (var->xres < MIN_XRES)
345 var->xres = MIN_XRES;
346 if (var->yres < MIN_YRES)
347 var->yres = MIN_YRES;
348
349 imxfb_mode = imxfb_find_mode(fbi);
350 if (!imxfb_mode)
351 return -EINVAL;
352
353 var->xres = imxfb_mode->mode.xres;
354 var->yres = imxfb_mode->mode.yres;
355 var->bits_per_pixel = imxfb_mode->bpp;
356 var->pixclock = imxfb_mode->mode.pixclock;
357 var->hsync_len = imxfb_mode->mode.hsync_len;
358 var->left_margin = imxfb_mode->mode.left_margin;
359 var->right_margin = imxfb_mode->mode.right_margin;
360 var->vsync_len = imxfb_mode->mode.vsync_len;
361 var->upper_margin = imxfb_mode->mode.upper_margin;
362 var->lower_margin = imxfb_mode->mode.lower_margin;
363 var->sync = imxfb_mode->mode.sync;
364 var->xres_virtual = max(var->xres_virtual, var->xres);
365 var->yres_virtual = max(var->yres_virtual, var->yres);
366
367 pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel);
368
369 lcd_clk = clk_get_rate(fbi->clk_per);
370
371 tmp = var->pixclock * (unsigned long long)lcd_clk;
372
373 do_div(tmp, 1000000);
374
375 if (do_div(tmp, 1000000) > 500000)
376 tmp++;
377
378 pcr = (unsigned int)tmp;
379
380 if (--pcr > 0x3F) {
381 pcr = 0x3F;
382 printk(KERN_WARNING "Must limit pixel clock to %luHz\n",
383 lcd_clk / pcr);
384 }
385
386 switch (var->bits_per_pixel) {
387 case 32:
388 pcr |= PCR_BPIX_18;
389 rgb = &def_rgb_18;
390 break;
391 case 16:
392 default:
393 if (is_imx1_fb(fbi))
394 pcr |= PCR_BPIX_12;
395 else
396 pcr |= PCR_BPIX_16;
397
398 if (imxfb_mode->pcr & PCR_TFT)
399 rgb = &def_rgb_16_tft;
400 else
401 rgb = &def_rgb_16_stn;
402 break;
403 case 8:
404 pcr |= PCR_BPIX_8;
405 rgb = &def_rgb_8;
406 break;
407 }
408
409 /* add sync polarities */
410 pcr |= imxfb_mode->pcr & ~(0x3f | (7 << 25));
411
412 fbi->pcr = pcr;
413
414 /*
415 * Copy the RGB parameters for this display
416 * from the machine specific parameters.
417 */
418 var->red = rgb->red;
419 var->green = rgb->green;
420 var->blue = rgb->blue;
421 var->transp = rgb->transp;
422
423 pr_debug("RGBT length = %d:%d:%d:%d\n",
424 var->red.length, var->green.length, var->blue.length,
425 var->transp.length);
426
427 pr_debug("RGBT offset = %d:%d:%d:%d\n",
428 var->red.offset, var->green.offset, var->blue.offset,
429 var->transp.offset);
430
431 return 0;
432 }
433
434 /*
435 * imxfb_set_par():
436 * Set the user defined part of the display for the specified console
437 */
imxfb_set_par(struct fb_info * info)438 static int imxfb_set_par(struct fb_info *info)
439 {
440 struct imxfb_info *fbi = info->par;
441 struct fb_var_screeninfo *var = &info->var;
442
443 if (var->bits_per_pixel == 16 || var->bits_per_pixel == 32)
444 info->fix.visual = FB_VISUAL_TRUECOLOR;
445 else if (!fbi->cmap_static)
446 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
447 else {
448 /*
449 * Some people have weird ideas about wanting static
450 * pseudocolor maps. I suspect their user space
451 * applications are broken.
452 */
453 info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
454 }
455
456 info->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8;
457 fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16;
458
459 imxfb_activate_var(var, info);
460
461 return 0;
462 }
463
464 #ifdef PWMR_BACKLIGHT_AVAILABLE
imxfb_bl_get_brightness(struct backlight_device * bl)465 static int imxfb_bl_get_brightness(struct backlight_device *bl)
466 {
467 struct imxfb_info *fbi = bl_get_data(bl);
468
469 return readl(fbi->regs + LCDC_PWMR) & 0xFF;
470 }
471
imxfb_bl_update_status(struct backlight_device * bl)472 static int imxfb_bl_update_status(struct backlight_device *bl)
473 {
474 struct imxfb_info *fbi = bl_get_data(bl);
475 int brightness = bl->props.brightness;
476
477 if (bl->props.power != FB_BLANK_UNBLANK)
478 brightness = 0;
479 if (bl->props.fb_blank != FB_BLANK_UNBLANK)
480 brightness = 0;
481
482 fbi->pwmr = (fbi->pwmr & ~0xFF) | brightness;
483
484 if (bl->props.fb_blank != FB_BLANK_UNBLANK) {
485 clk_prepare_enable(fbi->clk_ipg);
486 clk_prepare_enable(fbi->clk_ahb);
487 clk_prepare_enable(fbi->clk_per);
488 }
489 writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
490 if (bl->props.fb_blank != FB_BLANK_UNBLANK) {
491 clk_disable_unprepare(fbi->clk_per);
492 clk_disable_unprepare(fbi->clk_ahb);
493 clk_disable_unprepare(fbi->clk_ipg);
494 }
495
496 return 0;
497 }
498
499 static const struct backlight_ops imxfb_lcdc_bl_ops = {
500 .update_status = imxfb_bl_update_status,
501 .get_brightness = imxfb_bl_get_brightness,
502 };
503
imxfb_init_backlight(struct imxfb_info * fbi)504 static void imxfb_init_backlight(struct imxfb_info *fbi)
505 {
506 struct backlight_properties props;
507 struct backlight_device *bl;
508
509 if (fbi->bl)
510 return;
511
512 memset(&props, 0, sizeof(struct backlight_properties));
513 props.max_brightness = 0xff;
514 props.type = BACKLIGHT_RAW;
515 writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
516
517 bl = backlight_device_register("imxfb-bl", &fbi->pdev->dev, fbi,
518 &imxfb_lcdc_bl_ops, &props);
519 if (IS_ERR(bl)) {
520 dev_err(&fbi->pdev->dev, "error %ld on backlight register\n",
521 PTR_ERR(bl));
522 return;
523 }
524
525 fbi->bl = bl;
526 bl->props.power = FB_BLANK_UNBLANK;
527 bl->props.fb_blank = FB_BLANK_UNBLANK;
528 bl->props.brightness = imxfb_bl_get_brightness(bl);
529 }
530
imxfb_exit_backlight(struct imxfb_info * fbi)531 static void imxfb_exit_backlight(struct imxfb_info *fbi)
532 {
533 if (fbi->bl)
534 backlight_device_unregister(fbi->bl);
535 }
536 #endif
537
imxfb_enable_controller(struct imxfb_info * fbi)538 static void imxfb_enable_controller(struct imxfb_info *fbi)
539 {
540
541 if (fbi->enabled)
542 return;
543
544 pr_debug("Enabling LCD controller\n");
545
546 writel(fbi->screen_dma, fbi->regs + LCDC_SSA);
547
548 /* panning offset 0 (0 pixel offset) */
549 writel(0x00000000, fbi->regs + LCDC_POS);
550
551 /* disable hardware cursor */
552 writel(readl(fbi->regs + LCDC_CPOS) & ~(CPOS_CC0 | CPOS_CC1),
553 fbi->regs + LCDC_CPOS);
554
555 /*
556 * RMCR_LCDC_EN_MX1 is present on i.MX1 only, but doesn't hurt
557 * on other SoCs
558 */
559 writel(RMCR_LCDC_EN_MX1, fbi->regs + LCDC_RMCR);
560
561 clk_prepare_enable(fbi->clk_ipg);
562 clk_prepare_enable(fbi->clk_ahb);
563 clk_prepare_enable(fbi->clk_per);
564 fbi->enabled = true;
565
566 if (fbi->backlight_power)
567 fbi->backlight_power(1);
568 if (fbi->lcd_power)
569 fbi->lcd_power(1);
570 }
571
imxfb_disable_controller(struct imxfb_info * fbi)572 static void imxfb_disable_controller(struct imxfb_info *fbi)
573 {
574 if (!fbi->enabled)
575 return;
576
577 pr_debug("Disabling LCD controller\n");
578
579 if (fbi->backlight_power)
580 fbi->backlight_power(0);
581 if (fbi->lcd_power)
582 fbi->lcd_power(0);
583
584 clk_disable_unprepare(fbi->clk_per);
585 clk_disable_unprepare(fbi->clk_ipg);
586 clk_disable_unprepare(fbi->clk_ahb);
587 fbi->enabled = false;
588
589 writel(0, fbi->regs + LCDC_RMCR);
590 }
591
imxfb_blank(int blank,struct fb_info * info)592 static int imxfb_blank(int blank, struct fb_info *info)
593 {
594 struct imxfb_info *fbi = info->par;
595
596 pr_debug("imxfb_blank: blank=%d\n", blank);
597
598 switch (blank) {
599 case FB_BLANK_POWERDOWN:
600 case FB_BLANK_VSYNC_SUSPEND:
601 case FB_BLANK_HSYNC_SUSPEND:
602 case FB_BLANK_NORMAL:
603 imxfb_disable_controller(fbi);
604 break;
605
606 case FB_BLANK_UNBLANK:
607 imxfb_enable_controller(fbi);
608 break;
609 }
610 return 0;
611 }
612
613 static struct fb_ops imxfb_ops = {
614 .owner = THIS_MODULE,
615 .fb_check_var = imxfb_check_var,
616 .fb_set_par = imxfb_set_par,
617 .fb_setcolreg = imxfb_setcolreg,
618 .fb_fillrect = cfb_fillrect,
619 .fb_copyarea = cfb_copyarea,
620 .fb_imageblit = cfb_imageblit,
621 .fb_blank = imxfb_blank,
622 };
623
624 /*
625 * imxfb_activate_var():
626 * Configures LCD Controller based on entries in var parameter. Settings are
627 * only written to the controller if changes were made.
628 */
imxfb_activate_var(struct fb_var_screeninfo * var,struct fb_info * info)629 static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info)
630 {
631 struct imxfb_info *fbi = info->par;
632 u32 ymax_mask = is_imx1_fb(fbi) ? YMAX_MASK_IMX1 : YMAX_MASK_IMX21;
633
634 pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",
635 var->xres, var->hsync_len,
636 var->left_margin, var->right_margin);
637 pr_debug("var: yres=%d vslen=%d um=%d bm=%d\n",
638 var->yres, var->vsync_len,
639 var->upper_margin, var->lower_margin);
640
641 #if DEBUG_VAR
642 if (var->xres < 16 || var->xres > 1024)
643 printk(KERN_ERR "%s: invalid xres %d\n",
644 info->fix.id, var->xres);
645 if (var->hsync_len < 1 || var->hsync_len > 64)
646 printk(KERN_ERR "%s: invalid hsync_len %d\n",
647 info->fix.id, var->hsync_len);
648 if (var->left_margin > 255)
649 printk(KERN_ERR "%s: invalid left_margin %d\n",
650 info->fix.id, var->left_margin);
651 if (var->right_margin > 255)
652 printk(KERN_ERR "%s: invalid right_margin %d\n",
653 info->fix.id, var->right_margin);
654 if (var->yres < 1 || var->yres > ymax_mask)
655 printk(KERN_ERR "%s: invalid yres %d\n",
656 info->fix.id, var->yres);
657 if (var->vsync_len > 100)
658 printk(KERN_ERR "%s: invalid vsync_len %d\n",
659 info->fix.id, var->vsync_len);
660 if (var->upper_margin > 63)
661 printk(KERN_ERR "%s: invalid upper_margin %d\n",
662 info->fix.id, var->upper_margin);
663 if (var->lower_margin > 255)
664 printk(KERN_ERR "%s: invalid lower_margin %d\n",
665 info->fix.id, var->lower_margin);
666 #endif
667
668 /* physical screen start address */
669 writel(VPW_VPW(var->xres * var->bits_per_pixel / 8 / 4),
670 fbi->regs + LCDC_VPW);
671
672 writel(HCR_H_WIDTH(var->hsync_len - 1) |
673 HCR_H_WAIT_1(var->right_margin - 1) |
674 HCR_H_WAIT_2(var->left_margin - 3),
675 fbi->regs + LCDC_HCR);
676
677 writel(VCR_V_WIDTH(var->vsync_len) |
678 VCR_V_WAIT_1(var->lower_margin) |
679 VCR_V_WAIT_2(var->upper_margin),
680 fbi->regs + LCDC_VCR);
681
682 writel(SIZE_XMAX(var->xres) | (var->yres & ymax_mask),
683 fbi->regs + LCDC_SIZE);
684
685 writel(fbi->pcr, fbi->regs + LCDC_PCR);
686 #ifndef PWMR_BACKLIGHT_AVAILABLE
687 writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
688 #endif
689 writel(fbi->lscr1, fbi->regs + LCDC_LSCR1);
690 writel(fbi->dmacr, fbi->regs + LCDC_DMACR);
691
692 return 0;
693 }
694
695 #ifdef CONFIG_PM
696 /*
697 * Power management hooks. Note that we won't be called from IRQ context,
698 * unlike the blank functions above, so we may sleep.
699 */
imxfb_suspend(struct platform_device * dev,pm_message_t state)700 static int imxfb_suspend(struct platform_device *dev, pm_message_t state)
701 {
702 struct fb_info *info = platform_get_drvdata(dev);
703 struct imxfb_info *fbi = info->par;
704
705 pr_debug("%s\n", __func__);
706
707 imxfb_disable_controller(fbi);
708 return 0;
709 }
710
imxfb_resume(struct platform_device * dev)711 static int imxfb_resume(struct platform_device *dev)
712 {
713 struct fb_info *info = platform_get_drvdata(dev);
714 struct imxfb_info *fbi = info->par;
715
716 pr_debug("%s\n", __func__);
717
718 imxfb_enable_controller(fbi);
719 return 0;
720 }
721 #else
722 #define imxfb_suspend NULL
723 #define imxfb_resume NULL
724 #endif
725
imxfb_init_fbinfo(struct platform_device * pdev)726 static int __init imxfb_init_fbinfo(struct platform_device *pdev)
727 {
728 struct imx_fb_platform_data *pdata = pdev->dev.platform_data;
729 struct fb_info *info = dev_get_drvdata(&pdev->dev);
730 struct imxfb_info *fbi = info->par;
731 struct imx_fb_videomode *m;
732 int i;
733
734 pr_debug("%s\n",__func__);
735
736 info->pseudo_palette = kmalloc(sizeof(u32) * 16, GFP_KERNEL);
737 if (!info->pseudo_palette)
738 return -ENOMEM;
739
740 memset(fbi, 0, sizeof(struct imxfb_info));
741
742 fbi->devtype = pdev->id_entry->driver_data;
743
744 strlcpy(info->fix.id, IMX_NAME, sizeof(info->fix.id));
745
746 info->fix.type = FB_TYPE_PACKED_PIXELS;
747 info->fix.type_aux = 0;
748 info->fix.xpanstep = 0;
749 info->fix.ypanstep = 0;
750 info->fix.ywrapstep = 0;
751 info->fix.accel = FB_ACCEL_NONE;
752
753 info->var.nonstd = 0;
754 info->var.activate = FB_ACTIVATE_NOW;
755 info->var.height = -1;
756 info->var.width = -1;
757 info->var.accel_flags = 0;
758 info->var.vmode = FB_VMODE_NONINTERLACED;
759
760 info->fbops = &imxfb_ops;
761 info->flags = FBINFO_FLAG_DEFAULT |
762 FBINFO_READS_FAST;
763 info->var.grayscale = pdata->cmap_greyscale;
764 fbi->cmap_inverse = pdata->cmap_inverse;
765 fbi->cmap_static = pdata->cmap_static;
766 fbi->lscr1 = pdata->lscr1;
767 fbi->dmacr = pdata->dmacr;
768 fbi->pwmr = pdata->pwmr;
769 fbi->lcd_power = pdata->lcd_power;
770 fbi->backlight_power = pdata->backlight_power;
771
772 for (i = 0, m = &pdata->mode[0]; i < pdata->num_modes; i++, m++)
773 info->fix.smem_len = max_t(size_t, info->fix.smem_len,
774 m->mode.xres * m->mode.yres * m->bpp / 8);
775
776 return 0;
777 }
778
imxfb_probe(struct platform_device * pdev)779 static int __init imxfb_probe(struct platform_device *pdev)
780 {
781 struct imxfb_info *fbi;
782 struct fb_info *info;
783 struct imx_fb_platform_data *pdata;
784 struct resource *res;
785 int ret, i;
786
787 dev_info(&pdev->dev, "i.MX Framebuffer driver\n");
788
789 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
790 if (!res)
791 return -ENODEV;
792
793 pdata = pdev->dev.platform_data;
794 if (!pdata) {
795 dev_err(&pdev->dev,"No platform_data available\n");
796 return -ENOMEM;
797 }
798
799 info = framebuffer_alloc(sizeof(struct imxfb_info), &pdev->dev);
800 if (!info)
801 return -ENOMEM;
802
803 fbi = info->par;
804
805 if (!fb_mode)
806 fb_mode = pdata->mode[0].mode.name;
807
808 platform_set_drvdata(pdev, info);
809
810 ret = imxfb_init_fbinfo(pdev);
811 if (ret < 0)
812 goto failed_init;
813
814 res = request_mem_region(res->start, resource_size(res),
815 DRIVER_NAME);
816 if (!res) {
817 ret = -EBUSY;
818 goto failed_req;
819 }
820
821 fbi->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
822 if (IS_ERR(fbi->clk_ipg)) {
823 ret = PTR_ERR(fbi->clk_ipg);
824 goto failed_getclock;
825 }
826
827 fbi->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
828 if (IS_ERR(fbi->clk_ahb)) {
829 ret = PTR_ERR(fbi->clk_ahb);
830 goto failed_getclock;
831 }
832
833 fbi->clk_per = devm_clk_get(&pdev->dev, "per");
834 if (IS_ERR(fbi->clk_per)) {
835 ret = PTR_ERR(fbi->clk_per);
836 goto failed_getclock;
837 }
838
839 fbi->regs = ioremap(res->start, resource_size(res));
840 if (fbi->regs == NULL) {
841 dev_err(&pdev->dev, "Cannot map frame buffer registers\n");
842 ret = -ENOMEM;
843 goto failed_ioremap;
844 }
845
846 if (!pdata->fixed_screen_cpu) {
847 fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
848 fbi->map_cpu = dma_alloc_writecombine(&pdev->dev,
849 fbi->map_size, &fbi->map_dma, GFP_KERNEL);
850
851 if (!fbi->map_cpu) {
852 dev_err(&pdev->dev, "Failed to allocate video RAM: %d\n", ret);
853 ret = -ENOMEM;
854 goto failed_map;
855 }
856
857 info->screen_base = fbi->map_cpu;
858 fbi->screen_cpu = fbi->map_cpu;
859 fbi->screen_dma = fbi->map_dma;
860 info->fix.smem_start = fbi->screen_dma;
861 } else {
862 /* Fixed framebuffer mapping enables location of the screen in eSRAM */
863 fbi->map_cpu = pdata->fixed_screen_cpu;
864 fbi->map_dma = pdata->fixed_screen_dma;
865 info->screen_base = fbi->map_cpu;
866 fbi->screen_cpu = fbi->map_cpu;
867 fbi->screen_dma = fbi->map_dma;
868 info->fix.smem_start = fbi->screen_dma;
869 }
870
871 if (pdata->init) {
872 ret = pdata->init(fbi->pdev);
873 if (ret)
874 goto failed_platform_init;
875 }
876
877 fbi->mode = pdata->mode;
878 fbi->num_modes = pdata->num_modes;
879
880 INIT_LIST_HEAD(&info->modelist);
881 for (i = 0; i < pdata->num_modes; i++)
882 fb_add_videomode(&pdata->mode[i].mode, &info->modelist);
883
884 /*
885 * This makes sure that our colour bitfield
886 * descriptors are correctly initialised.
887 */
888 imxfb_check_var(&info->var, info);
889
890 ret = fb_alloc_cmap(&info->cmap, 1 << info->var.bits_per_pixel, 0);
891 if (ret < 0)
892 goto failed_cmap;
893
894 imxfb_set_par(info);
895 ret = register_framebuffer(info);
896 if (ret < 0) {
897 dev_err(&pdev->dev, "failed to register framebuffer\n");
898 goto failed_register;
899 }
900
901 imxfb_enable_controller(fbi);
902 fbi->pdev = pdev;
903 #ifdef PWMR_BACKLIGHT_AVAILABLE
904 imxfb_init_backlight(fbi);
905 #endif
906
907 return 0;
908
909 failed_register:
910 fb_dealloc_cmap(&info->cmap);
911 failed_cmap:
912 if (pdata->exit)
913 pdata->exit(fbi->pdev);
914 failed_platform_init:
915 if (!pdata->fixed_screen_cpu)
916 dma_free_writecombine(&pdev->dev,fbi->map_size,fbi->map_cpu,
917 fbi->map_dma);
918 failed_map:
919 iounmap(fbi->regs);
920 failed_ioremap:
921 failed_getclock:
922 release_mem_region(res->start, resource_size(res));
923 failed_req:
924 kfree(info->pseudo_palette);
925 failed_init:
926 platform_set_drvdata(pdev, NULL);
927 framebuffer_release(info);
928 return ret;
929 }
930
imxfb_remove(struct platform_device * pdev)931 static int imxfb_remove(struct platform_device *pdev)
932 {
933 struct imx_fb_platform_data *pdata;
934 struct fb_info *info = platform_get_drvdata(pdev);
935 struct imxfb_info *fbi = info->par;
936 struct resource *res;
937
938 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
939
940 imxfb_disable_controller(fbi);
941
942 #ifdef PWMR_BACKLIGHT_AVAILABLE
943 imxfb_exit_backlight(fbi);
944 #endif
945 unregister_framebuffer(info);
946
947 pdata = pdev->dev.platform_data;
948 if (pdata->exit)
949 pdata->exit(fbi->pdev);
950
951 fb_dealloc_cmap(&info->cmap);
952 kfree(info->pseudo_palette);
953 framebuffer_release(info);
954
955 iounmap(fbi->regs);
956 release_mem_region(res->start, resource_size(res));
957
958 platform_set_drvdata(pdev, NULL);
959
960 return 0;
961 }
962
imxfb_shutdown(struct platform_device * dev)963 void imxfb_shutdown(struct platform_device * dev)
964 {
965 struct fb_info *info = platform_get_drvdata(dev);
966 struct imxfb_info *fbi = info->par;
967 imxfb_disable_controller(fbi);
968 }
969
970 static struct platform_driver imxfb_driver = {
971 .suspend = imxfb_suspend,
972 .resume = imxfb_resume,
973 .remove = imxfb_remove,
974 .shutdown = imxfb_shutdown,
975 .driver = {
976 .name = DRIVER_NAME,
977 },
978 .id_table = imxfb_devtype,
979 };
980
imxfb_setup(void)981 static int imxfb_setup(void)
982 {
983 #ifndef MODULE
984 char *opt, *options = NULL;
985
986 if (fb_get_options("imxfb", &options))
987 return -ENODEV;
988
989 if (!options || !*options)
990 return 0;
991
992 while ((opt = strsep(&options, ",")) != NULL) {
993 if (!*opt)
994 continue;
995 else
996 fb_mode = opt;
997 }
998 #endif
999 return 0;
1000 }
1001
imxfb_init(void)1002 int __init imxfb_init(void)
1003 {
1004 int ret = imxfb_setup();
1005
1006 if (ret < 0)
1007 return ret;
1008
1009 return platform_driver_probe(&imxfb_driver, imxfb_probe);
1010 }
1011
imxfb_cleanup(void)1012 static void __exit imxfb_cleanup(void)
1013 {
1014 platform_driver_unregister(&imxfb_driver);
1015 }
1016
1017 module_init(imxfb_init);
1018 module_exit(imxfb_cleanup);
1019
1020 MODULE_DESCRIPTION("Freescale i.MX framebuffer driver");
1021 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
1022 MODULE_LICENSE("GPL");
1023