1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Freescale i.MX Frame Buffer device driver
4 *
5 * Copyright (C) 2004 Sascha Hauer, Pengutronix
6 * Based on acornfb.c Copyright (C) Russell King.
7 *
8 * Please direct your questions and comments on this driver to the following
9 * email address:
10 *
11 * linux-arm-kernel@lists.arm.linux.org.uk
12 */
13
14#include <linux/module.h>
15#include <linux/kernel.h>
16#include <linux/errno.h>
17#include <linux/string.h>
18#include <linux/interrupt.h>
19#include <linux/slab.h>
20#include <linux/mm.h>
21#include <linux/fb.h>
22#include <linux/delay.h>
23#include <linux/init.h>
24#include <linux/ioport.h>
25#include <linux/cpufreq.h>
26#include <linux/clk.h>
27#include <linux/platform_device.h>
28#include <linux/dma-mapping.h>
29#include <linux/io.h>
30#include <linux/lcd.h>
31#include <linux/math64.h>
32#include <linux/of.h>
33#include <linux/of_device.h>
34#include <linux/bitfield.h>
35
36#include <linux/regulator/consumer.h>
37
38#include <video/of_display_timing.h>
39#include <video/of_videomode.h>
40#include <video/videomode.h>
41
42struct imx_fb_videomode {
43 struct fb_videomode mode;
44 u32 pcr;
45 bool aus_mode;
46 unsigned char bpp;
47};
48
49/*
50 * Complain if VAR is out of range.
51 */
52#define DEBUG_VAR 1
53
54#define DRIVER_NAME "imx-fb"
55
56#define LCDC_SSA 0x00
57
58#define LCDC_SIZE 0x04
59#define SIZE_XMAX_MASK GENMASK(25, 20)
60
61#define YMAX_MASK_IMX1 GENMASK(8, 0)
62#define YMAX_MASK_IMX21 GENMASK(9, 0)
63
64#define LCDC_VPW 0x08
65#define VPW_VPW_MASK GENMASK(9, 0)
66
67#define LCDC_CPOS 0x0C
68#define CPOS_CC1 BIT(31)
69#define CPOS_CC0 BIT(30)
70#define CPOS_OP BIT(28)
71#define CPOS_CXP_MASK GENMASK(25, 16)
72
73#define LCDC_LCWHB 0x10
74#define LCWHB_BK_EN BIT(31)
75#define LCWHB_CW_MASK GENMASK(28, 24)
76#define LCWHB_CH_MASK GENMASK(20, 16)
77#define LCWHB_BD_MASK GENMASK(7, 0)
78
79#define LCDC_LCHCC 0x14
80
81#define LCDC_PCR 0x18
82#define PCR_TFT BIT(31)
83#define PCR_COLOR BIT(30)
84#define PCR_BPIX_MASK GENMASK(27, 25)
85#define PCR_BPIX_8 3
86#define PCR_BPIX_12 4
87#define PCR_BPIX_16 5
88#define PCR_BPIX_18 6
89#define PCR_PCD_MASK GENMASK(5, 0)
90
91#define LCDC_HCR 0x1C
92#define HCR_H_WIDTH_MASK GENMASK(31, 26)
93#define HCR_H_WAIT_1_MASK GENMASK(15, 8)
94#define HCR_H_WAIT_2_MASK GENMASK(7, 0)
95
96#define LCDC_VCR 0x20
97#define VCR_V_WIDTH_MASK GENMASK(31, 26)
98#define VCR_V_WAIT_1_MASK GENMASK(15, 8)
99#define VCR_V_WAIT_2_MASK GENMASK(7, 0)
100
101#define LCDC_POS 0x24
102#define POS_POS_MASK GENMASK(4, 0)
103
104#define LCDC_LSCR1 0x28
105/* bit fields in imxfb.h */
106
107#define LCDC_PWMR 0x2C
108/* bit fields in imxfb.h */
109
110#define LCDC_DMACR 0x30
111/* bit fields in imxfb.h */
112
113#define LCDC_RMCR 0x34
114
115#define RMCR_LCDC_EN_MX1 BIT(1)
116
117#define RMCR_SELF_REF BIT(0)
118
119#define LCDC_LCDICR 0x38
120#define LCDICR_INT_SYN BIT(2)
121#define LCDICR_INT_CON BIT(0)
122
123#define LCDC_LCDISR 0x40
124#define LCDISR_UDR_ERR BIT(3)
125#define LCDISR_ERR_RES BIT(2)
126#define LCDISR_EOF BIT(1)
127#define LCDISR_BOF BIT(0)
128
129#define IMXFB_LSCR1_DEFAULT 0x00120300
130
131#define LCDC_LAUSCR 0x80
132#define LAUSCR_AUS_MODE BIT(31)
133
134/* Used fb-mode. Can be set on kernel command line, therefore file-static. */
135static const char *fb_mode;
136
137/*
138 * These are the bitfields for each
139 * display depth that we support.
140 */
141struct imxfb_rgb {
142 struct fb_bitfield red;
143 struct fb_bitfield green;
144 struct fb_bitfield blue;
145 struct fb_bitfield transp;
146};
147
148enum imxfb_type {
149 IMX1_FB,
150 IMX21_FB,
151};
152
153enum imxfb_panel_type {
154 PANEL_TYPE_MONOCHROME,
155 PANEL_TYPE_CSTN,
156 PANEL_TYPE_TFT,
157};
158
159struct imxfb_info {
160 struct platform_device *pdev;
161 void __iomem *regs;
162 struct clk *clk_ipg;
163 struct clk *clk_ahb;
164 struct clk *clk_per;
165 enum imxfb_type devtype;
166 enum imxfb_panel_type panel_type;
167 bool enabled;
168
169 /*
170 * These are the addresses we mapped
171 * the framebuffer memory region to.
172 */
173 dma_addr_t map_dma;
174 u_int map_size;
175
176 u_int palette_size;
177
178 dma_addr_t dbar1;
179 dma_addr_t dbar2;
180
181 u_int pcr;
182 u_int lauscr;
183 u_int pwmr;
184 u_int lscr1;
185 u_int dmacr;
186 bool cmap_inverse;
187 bool cmap_static;
188
189 struct imx_fb_videomode *mode;
190 int num_modes;
191
192 struct regulator *lcd_pwr;
193 int lcd_pwr_enabled;
194};
195
196static const struct platform_device_id imxfb_devtype[] = {
197 {
198 .name = "imx1-fb",
199 .driver_data = IMX1_FB,
200 }, {
201 .name = "imx21-fb",
202 .driver_data = IMX21_FB,
203 }, {
204 /* sentinel */
205 }
206};
207MODULE_DEVICE_TABLE(platform, imxfb_devtype);
208
209static const struct of_device_id imxfb_of_dev_id[] = {
210 {
211 .compatible = "fsl,imx1-fb",
212 .data = &imxfb_devtype[IMX1_FB],
213 }, {
214 .compatible = "fsl,imx21-fb",
215 .data = &imxfb_devtype[IMX21_FB],
216 }, {
217 /* sentinel */
218 }
219};
220MODULE_DEVICE_TABLE(of, imxfb_of_dev_id);
221
222static inline int is_imx1_fb(struct imxfb_info *fbi)
223{
224 return fbi->devtype == IMX1_FB;
225}
226
227#define IMX_NAME "IMX"
228
229/*
230 * Minimum X and Y resolutions
231 */
232#define MIN_XRES 64
233#define MIN_YRES 64
234
235/* Actually this really is 18bit support, the lowest 2 bits of each colour
236 * are unused in hardware. We claim to have 24bit support to make software
237 * like X work, which does not support 18bit.
238 */
239static struct imxfb_rgb def_rgb_18 = {
240 .red = {.offset = 16, .length = 8,},
241 .green = {.offset = 8, .length = 8,},
242 .blue = {.offset = 0, .length = 8,},
243 .transp = {.offset = 0, .length = 0,},
244};
245
246static struct imxfb_rgb def_rgb_16_tft = {
247 .red = {.offset = 11, .length = 5,},
248 .green = {.offset = 5, .length = 6,},
249 .blue = {.offset = 0, .length = 5,},
250 .transp = {.offset = 0, .length = 0,},
251};
252
253static struct imxfb_rgb def_rgb_16_stn = {
254 .red = {.offset = 8, .length = 4,},
255 .green = {.offset = 4, .length = 4,},
256 .blue = {.offset = 0, .length = 4,},
257 .transp = {.offset = 0, .length = 0,},
258};
259
260static struct imxfb_rgb def_rgb_8 = {
261 .red = {.offset = 0, .length = 8,},
262 .green = {.offset = 0, .length = 8,},
263 .blue = {.offset = 0, .length = 8,},
264 .transp = {.offset = 0, .length = 0,},
265};
266
267static int imxfb_activate_var(struct fb_var_screeninfo *var,
268 struct fb_info *info);
269
270static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
271{
272 chan &= 0xffff;
273 chan >>= 16 - bf->length;
274 return chan << bf->offset;
275}
276
277static int imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
278 u_int trans, struct fb_info *info)
279{
280 struct imxfb_info *fbi = info->par;
281 u_int val, ret = 1;
282
283#define CNVT_TOHW(val, width) ((((val)<<(width))+0x7FFF-(val))>>16)
284 if (regno < fbi->palette_size) {
285 val = (CNVT_TOHW(red, 4) << 8) |
286 (CNVT_TOHW(green, 4) << 4) |
287 CNVT_TOHW(blue, 4);
288
289 writel(val, addr: fbi->regs + 0x800 + (regno << 2));
290 ret = 0;
291 }
292 return ret;
293}
294
295static int imxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
296 u_int trans, struct fb_info *info)
297{
298 struct imxfb_info *fbi = info->par;
299 unsigned int val;
300 int ret = 1;
301
302 /*
303 * If inverse mode was selected, invert all the colours
304 * rather than the register number. The register number
305 * is what you poke into the framebuffer to produce the
306 * colour you requested.
307 */
308 if (fbi->cmap_inverse) {
309 red = 0xffff - red;
310 green = 0xffff - green;
311 blue = 0xffff - blue;
312 }
313
314 /*
315 * If greyscale is true, then we convert the RGB value
316 * to greyscale no mater what visual we are using.
317 */
318 if (info->var.grayscale)
319 red = green = blue = (19595 * red + 38470 * green +
320 7471 * blue) >> 16;
321
322 switch (info->fix.visual) {
323 case FB_VISUAL_TRUECOLOR:
324 /*
325 * 12 or 16-bit True Colour. We encode the RGB value
326 * according to the RGB bitfield information.
327 */
328 if (regno < 16) {
329 u32 *pal = info->pseudo_palette;
330
331 val = chan_to_field(chan: red, bf: &info->var.red);
332 val |= chan_to_field(chan: green, bf: &info->var.green);
333 val |= chan_to_field(chan: blue, bf: &info->var.blue);
334
335 pal[regno] = val;
336 ret = 0;
337 }
338 break;
339
340 case FB_VISUAL_STATIC_PSEUDOCOLOR:
341 case FB_VISUAL_PSEUDOCOLOR:
342 ret = imxfb_setpalettereg(regno, red, green, blue, trans, info);
343 break;
344 }
345
346 return ret;
347}
348
349static const struct imx_fb_videomode *imxfb_find_mode(struct imxfb_info *fbi)
350{
351 struct imx_fb_videomode *m;
352 int i;
353
354 if (!fb_mode)
355 return &fbi->mode[0];
356
357 for (i = 0, m = &fbi->mode[0]; i < fbi->num_modes; i++, m++) {
358 if (!strcmp(m->mode.name, fb_mode))
359 return m;
360 }
361 return NULL;
362}
363
364/*
365 * imxfb_check_var():
366 * Round up in the following order: bits_per_pixel, xres,
367 * yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
368 * bitfields, horizontal timing, vertical timing.
369 */
370static int imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
371{
372 struct imxfb_info *fbi = info->par;
373 struct imxfb_rgb *rgb;
374 const struct imx_fb_videomode *imxfb_mode;
375 unsigned long lcd_clk;
376 unsigned long long tmp;
377 u32 pcr = 0;
378
379 if (var->xres < MIN_XRES)
380 var->xres = MIN_XRES;
381 if (var->yres < MIN_YRES)
382 var->yres = MIN_YRES;
383
384 imxfb_mode = imxfb_find_mode(fbi);
385 if (!imxfb_mode)
386 return -EINVAL;
387
388 var->xres = imxfb_mode->mode.xres;
389 var->yres = imxfb_mode->mode.yres;
390 var->bits_per_pixel = imxfb_mode->bpp;
391 var->pixclock = imxfb_mode->mode.pixclock;
392 var->hsync_len = imxfb_mode->mode.hsync_len;
393 var->left_margin = imxfb_mode->mode.left_margin;
394 var->right_margin = imxfb_mode->mode.right_margin;
395 var->vsync_len = imxfb_mode->mode.vsync_len;
396 var->upper_margin = imxfb_mode->mode.upper_margin;
397 var->lower_margin = imxfb_mode->mode.lower_margin;
398 var->sync = imxfb_mode->mode.sync;
399 var->xres_virtual = max(var->xres_virtual, var->xres);
400 var->yres_virtual = max(var->yres_virtual, var->yres);
401
402 pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel);
403
404 lcd_clk = clk_get_rate(clk: fbi->clk_per);
405
406 tmp = var->pixclock * (unsigned long long)lcd_clk;
407
408 do_div(tmp, 1000000);
409
410 if (do_div(tmp, 1000000) > 500000)
411 tmp++;
412
413 pcr = (unsigned int)tmp;
414
415 if (--pcr > PCR_PCD_MASK) {
416 pcr = PCR_PCD_MASK;
417 dev_warn(&fbi->pdev->dev, "Must limit pixel clock to %luHz\n",
418 lcd_clk / pcr);
419 }
420
421 switch (var->bits_per_pixel) {
422 case 32:
423 pcr |= FIELD_PREP(PCR_BPIX_MASK, PCR_BPIX_18);
424 rgb = &def_rgb_18;
425 break;
426 case 16:
427 default:
428 if (is_imx1_fb(fbi))
429 pcr |= FIELD_PREP(PCR_BPIX_MASK, PCR_BPIX_12);
430 else
431 pcr |= FIELD_PREP(PCR_BPIX_MASK, PCR_BPIX_16);
432
433 if (imxfb_mode->pcr & PCR_TFT)
434 rgb = &def_rgb_16_tft;
435 else
436 rgb = &def_rgb_16_stn;
437 break;
438 case 8:
439 pcr |= FIELD_PREP(PCR_BPIX_MASK, PCR_BPIX_8);
440 rgb = &def_rgb_8;
441 break;
442 }
443
444 /* add sync polarities */
445 pcr |= imxfb_mode->pcr & ~(PCR_PCD_MASK | PCR_BPIX_MASK);
446
447 fbi->pcr = pcr;
448 /*
449 * The LCDC AUS Mode Control Register does not exist on imx1.
450 */
451 if (!is_imx1_fb(fbi) && imxfb_mode->aus_mode)
452 fbi->lauscr = LAUSCR_AUS_MODE;
453
454 if (imxfb_mode->pcr & PCR_TFT)
455 fbi->panel_type = PANEL_TYPE_TFT;
456 else if (imxfb_mode->pcr & PCR_COLOR)
457 fbi->panel_type = PANEL_TYPE_CSTN;
458 else
459 fbi->panel_type = PANEL_TYPE_MONOCHROME;
460
461 /*
462 * Copy the RGB parameters for this display
463 * from the machine specific parameters.
464 */
465 var->red = rgb->red;
466 var->green = rgb->green;
467 var->blue = rgb->blue;
468 var->transp = rgb->transp;
469
470 pr_debug("RGBT length = %d:%d:%d:%d\n",
471 var->red.length, var->green.length, var->blue.length,
472 var->transp.length);
473
474 pr_debug("RGBT offset = %d:%d:%d:%d\n",
475 var->red.offset, var->green.offset, var->blue.offset,
476 var->transp.offset);
477
478 return 0;
479}
480
481/*
482 * imxfb_set_par():
483 * Set the user defined part of the display for the specified console
484 */
485static int imxfb_set_par(struct fb_info *info)
486{
487 struct imxfb_info *fbi = info->par;
488 struct fb_var_screeninfo *var = &info->var;
489
490 if (var->bits_per_pixel == 16 || var->bits_per_pixel == 32)
491 info->fix.visual = FB_VISUAL_TRUECOLOR;
492 else if (!fbi->cmap_static)
493 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
494 else {
495 /*
496 * Some people have weird ideas about wanting static
497 * pseudocolor maps. I suspect their user space
498 * applications are broken.
499 */
500 info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
501 }
502
503 info->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8;
504 fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16;
505
506 imxfb_activate_var(var, info);
507
508 return 0;
509}
510
511static int imxfb_enable_controller(struct imxfb_info *fbi)
512{
513 int ret;
514
515 if (fbi->enabled)
516 return 0;
517
518 pr_debug("Enabling LCD controller\n");
519
520 writel(val: fbi->map_dma, addr: fbi->regs + LCDC_SSA);
521
522 /* panning offset 0 (0 pixel offset) */
523 writel(FIELD_PREP(POS_POS_MASK, 0), addr: fbi->regs + LCDC_POS);
524
525 /* disable hardware cursor */
526 writel(readl(addr: fbi->regs + LCDC_CPOS) & ~(CPOS_CC0 | CPOS_CC1),
527 addr: fbi->regs + LCDC_CPOS);
528
529 /*
530 * RMCR_LCDC_EN_MX1 is present on i.MX1 only, but doesn't hurt
531 * on other SoCs
532 */
533 writel(RMCR_LCDC_EN_MX1, addr: fbi->regs + LCDC_RMCR);
534
535 ret = clk_prepare_enable(clk: fbi->clk_ipg);
536 if (ret)
537 goto err_enable_ipg;
538
539 ret = clk_prepare_enable(clk: fbi->clk_ahb);
540 if (ret)
541 goto err_enable_ahb;
542
543 ret = clk_prepare_enable(clk: fbi->clk_per);
544 if (ret)
545 goto err_enable_per;
546
547 fbi->enabled = true;
548 return 0;
549
550err_enable_per:
551 clk_disable_unprepare(clk: fbi->clk_ahb);
552err_enable_ahb:
553 clk_disable_unprepare(clk: fbi->clk_ipg);
554err_enable_ipg:
555 writel(val: 0, addr: fbi->regs + LCDC_RMCR);
556
557 return ret;
558}
559
560static void imxfb_disable_controller(struct imxfb_info *fbi)
561{
562 if (!fbi->enabled)
563 return;
564
565 pr_debug("Disabling LCD controller\n");
566
567 clk_disable_unprepare(clk: fbi->clk_per);
568 clk_disable_unprepare(clk: fbi->clk_ahb);
569 clk_disable_unprepare(clk: fbi->clk_ipg);
570 fbi->enabled = false;
571
572 writel(val: 0, addr: fbi->regs + LCDC_RMCR);
573}
574
575static int imxfb_blank(int blank, struct fb_info *info)
576{
577 struct imxfb_info *fbi = info->par;
578
579 pr_debug("%s: blank=%d\n", __func__, blank);
580
581 switch (blank) {
582 case FB_BLANK_POWERDOWN:
583 case FB_BLANK_VSYNC_SUSPEND:
584 case FB_BLANK_HSYNC_SUSPEND:
585 case FB_BLANK_NORMAL:
586 imxfb_disable_controller(fbi);
587 break;
588
589 case FB_BLANK_UNBLANK:
590 return imxfb_enable_controller(fbi);
591 }
592 return 0;
593}
594
595static const struct fb_ops imxfb_ops = {
596 .owner = THIS_MODULE,
597 FB_DEFAULT_IOMEM_OPS,
598 .fb_check_var = imxfb_check_var,
599 .fb_set_par = imxfb_set_par,
600 .fb_setcolreg = imxfb_setcolreg,
601 .fb_blank = imxfb_blank,
602};
603
604/*
605 * imxfb_activate_var():
606 * Configures LCD Controller based on entries in var parameter. Settings are
607 * only written to the controller if changes were made.
608 */
609static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info)
610{
611 struct imxfb_info *fbi = info->par;
612 u32 ymax_mask = is_imx1_fb(fbi) ? YMAX_MASK_IMX1 : YMAX_MASK_IMX21;
613 u8 left_margin_low;
614
615 pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",
616 var->xres, var->hsync_len,
617 var->left_margin, var->right_margin);
618 pr_debug("var: yres=%d vslen=%d um=%d bm=%d\n",
619 var->yres, var->vsync_len,
620 var->upper_margin, var->lower_margin);
621
622 if (fbi->panel_type == PANEL_TYPE_TFT)
623 left_margin_low = 3;
624 else if (fbi->panel_type == PANEL_TYPE_CSTN)
625 left_margin_low = 2;
626 else
627 left_margin_low = 0;
628
629#if DEBUG_VAR
630 if (var->xres < 16 || var->xres > 1024)
631 dev_err(&fbi->pdev->dev, "%s: invalid xres %d\n",
632 info->fix.id, var->xres);
633 if (var->hsync_len < 1 || var->hsync_len > 64)
634 dev_err(&fbi->pdev->dev, "%s: invalid hsync_len %d\n",
635 info->fix.id, var->hsync_len);
636 if (var->left_margin < left_margin_low || var->left_margin > 255)
637 dev_err(&fbi->pdev->dev, "%s: invalid left_margin %d\n",
638 info->fix.id, var->left_margin);
639 if (var->right_margin < 1 || var->right_margin > 255)
640 dev_err(&fbi->pdev->dev, "%s: invalid right_margin %d\n",
641 info->fix.id, var->right_margin);
642 if (var->yres < 1 || var->yres > ymax_mask)
643 dev_err(&fbi->pdev->dev, "%s: invalid yres %d\n",
644 info->fix.id, var->yres);
645 if (var->vsync_len > 100)
646 dev_err(&fbi->pdev->dev, "%s: invalid vsync_len %d\n",
647 info->fix.id, var->vsync_len);
648 if (var->upper_margin > 63)
649 dev_err(&fbi->pdev->dev, "%s: invalid upper_margin %d\n",
650 info->fix.id, var->upper_margin);
651 if (var->lower_margin > 255)
652 dev_err(&fbi->pdev->dev, "%s: invalid lower_margin %d\n",
653 info->fix.id, var->lower_margin);
654#endif
655
656 /* physical screen start address */
657 writel(FIELD_PREP(VPW_VPW_MASK,
658 var->xres * var->bits_per_pixel / 8 / 4),
659 addr: fbi->regs + LCDC_VPW);
660
661 writel(FIELD_PREP(HCR_H_WIDTH_MASK, var->hsync_len - 1) |
662 FIELD_PREP(HCR_H_WAIT_1_MASK, var->right_margin - 1) |
663 FIELD_PREP(HCR_H_WAIT_2_MASK,
664 var->left_margin - left_margin_low),
665 addr: fbi->regs + LCDC_HCR);
666
667 writel(FIELD_PREP(VCR_V_WIDTH_MASK, var->vsync_len) |
668 FIELD_PREP(VCR_V_WAIT_1_MASK, var->lower_margin) |
669 FIELD_PREP(VCR_V_WAIT_2_MASK, var->upper_margin),
670 addr: fbi->regs + LCDC_VCR);
671
672 writel(FIELD_PREP(SIZE_XMAX_MASK, var->xres >> 4) |
673 (var->yres & ymax_mask),
674 addr: fbi->regs + LCDC_SIZE);
675
676 writel(val: fbi->pcr, addr: fbi->regs + LCDC_PCR);
677 if (fbi->pwmr)
678 writel(val: fbi->pwmr, addr: fbi->regs + LCDC_PWMR);
679 writel(val: fbi->lscr1, addr: fbi->regs + LCDC_LSCR1);
680
681 /* dmacr = 0 is no valid value, as we need DMA control marks. */
682 if (fbi->dmacr)
683 writel(val: fbi->dmacr, addr: fbi->regs + LCDC_DMACR);
684
685 if (fbi->lauscr)
686 writel(val: fbi->lauscr, addr: fbi->regs + LCDC_LAUSCR);
687
688 return 0;
689}
690
691static int imxfb_init_fbinfo(struct platform_device *pdev)
692{
693 struct fb_info *info = platform_get_drvdata(pdev);
694 struct imxfb_info *fbi = info->par;
695 struct device_node *np;
696
697 info->pseudo_palette = devm_kmalloc_array(dev: &pdev->dev, n: 16,
698 size: sizeof(u32), GFP_KERNEL);
699 if (!info->pseudo_palette)
700 return -ENOMEM;
701
702 memset(fbi, 0, sizeof(struct imxfb_info));
703
704 fbi->pdev = pdev;
705 fbi->devtype = pdev->id_entry->driver_data;
706
707 strscpy(info->fix.id, IMX_NAME, sizeof(info->fix.id));
708
709 info->fix.type = FB_TYPE_PACKED_PIXELS;
710 info->fix.type_aux = 0;
711 info->fix.xpanstep = 0;
712 info->fix.ypanstep = 0;
713 info->fix.ywrapstep = 0;
714 info->fix.accel = FB_ACCEL_NONE;
715
716 info->var.nonstd = 0;
717 info->var.activate = FB_ACTIVATE_NOW;
718 info->var.height = -1;
719 info->var.width = -1;
720 info->var.accel_flags = 0;
721 info->var.vmode = FB_VMODE_NONINTERLACED;
722
723 info->fbops = &imxfb_ops;
724 info->flags = FBINFO_READS_FAST;
725
726 np = pdev->dev.of_node;
727 info->var.grayscale = of_property_read_bool(np,
728 propname: "cmap-greyscale");
729 fbi->cmap_inverse = of_property_read_bool(np, propname: "cmap-inverse");
730 fbi->cmap_static = of_property_read_bool(np, propname: "cmap-static");
731
732 fbi->lscr1 = IMXFB_LSCR1_DEFAULT;
733
734 of_property_read_u32(np, propname: "fsl,lpccr", out_value: &fbi->pwmr);
735
736 of_property_read_u32(np, propname: "fsl,lscr1", out_value: &fbi->lscr1);
737
738 of_property_read_u32(np, propname: "fsl,dmacr", out_value: &fbi->dmacr);
739
740 return 0;
741}
742
743static int imxfb_of_read_mode(struct device *dev, struct device_node *np,
744 struct imx_fb_videomode *imxfb_mode)
745{
746 int ret;
747 struct fb_videomode *of_mode = &imxfb_mode->mode;
748 u32 bpp;
749 u32 pcr;
750
751 ret = of_property_read_string(np, propname: "model", out_string: &of_mode->name);
752 if (ret)
753 of_mode->name = NULL;
754
755 ret = of_get_fb_videomode(np, fb: of_mode, OF_USE_NATIVE_MODE);
756 if (ret) {
757 dev_err(dev, "Failed to get videomode from DT\n");
758 return ret;
759 }
760
761 ret = of_property_read_u32(np, propname: "bits-per-pixel", out_value: &bpp);
762 ret |= of_property_read_u32(np, propname: "fsl,pcr", out_value: &pcr);
763
764 if (ret) {
765 dev_err(dev, "Failed to read bpp and pcr from DT\n");
766 return -EINVAL;
767 }
768
769 if (bpp < 1 || bpp > 255) {
770 dev_err(dev, "Bits per pixel have to be between 1 and 255\n");
771 return -EINVAL;
772 }
773
774 imxfb_mode->bpp = bpp;
775 imxfb_mode->pcr = pcr;
776
777 /*
778 * fsl,aus-mode is optional
779 */
780 imxfb_mode->aus_mode = of_property_read_bool(np, propname: "fsl,aus-mode");
781
782 return 0;
783}
784
785static int imxfb_lcd_get_contrast(struct lcd_device *lcddev)
786{
787 struct imxfb_info *fbi = dev_get_drvdata(dev: &lcddev->dev);
788
789 return fbi->pwmr & 0xff;
790}
791
792static int imxfb_lcd_set_contrast(struct lcd_device *lcddev, int contrast)
793{
794 struct imxfb_info *fbi = dev_get_drvdata(dev: &lcddev->dev);
795
796 if (fbi->pwmr && fbi->enabled) {
797 if (contrast > 255)
798 contrast = 255;
799 else if (contrast < 0)
800 contrast = 0;
801
802 fbi->pwmr &= ~0xff;
803 fbi->pwmr |= contrast;
804
805 writel(val: fbi->pwmr, addr: fbi->regs + LCDC_PWMR);
806 }
807
808 return 0;
809}
810
811static int imxfb_lcd_get_power(struct lcd_device *lcddev)
812{
813 struct imxfb_info *fbi = dev_get_drvdata(dev: &lcddev->dev);
814
815 if (!IS_ERR(ptr: fbi->lcd_pwr) &&
816 !regulator_is_enabled(regulator: fbi->lcd_pwr))
817 return LCD_POWER_OFF;
818
819 return LCD_POWER_ON;
820}
821
822static int imxfb_regulator_set(struct imxfb_info *fbi, int enable)
823{
824 int ret;
825
826 if (enable == fbi->lcd_pwr_enabled)
827 return 0;
828
829 if (enable)
830 ret = regulator_enable(regulator: fbi->lcd_pwr);
831 else
832 ret = regulator_disable(regulator: fbi->lcd_pwr);
833
834 if (ret == 0)
835 fbi->lcd_pwr_enabled = enable;
836
837 return ret;
838}
839
840static int imxfb_lcd_set_power(struct lcd_device *lcddev, int power)
841{
842 struct imxfb_info *fbi = dev_get_drvdata(dev: &lcddev->dev);
843
844 if (!IS_ERR(ptr: fbi->lcd_pwr))
845 return imxfb_regulator_set(fbi, enable: power == LCD_POWER_ON);
846
847 return 0;
848}
849
850static const struct lcd_ops imxfb_lcd_ops = {
851 .get_contrast = imxfb_lcd_get_contrast,
852 .set_contrast = imxfb_lcd_set_contrast,
853 .get_power = imxfb_lcd_get_power,
854 .set_power = imxfb_lcd_set_power,
855};
856
857static int imxfb_setup(void)
858{
859 char *opt, *options = NULL;
860
861 if (fb_get_options(name: "imxfb", option: &options))
862 return -ENODEV;
863
864 if (!options || !*options)
865 return 0;
866
867 while ((opt = strsep(&options, ",")) != NULL) {
868 if (!*opt)
869 continue;
870 else
871 fb_mode = opt;
872 }
873
874 return 0;
875}
876
877static int imxfb_probe(struct platform_device *pdev)
878{
879 struct imxfb_info *fbi;
880 struct lcd_device *lcd;
881 struct fb_info *info;
882 struct imx_fb_videomode *m;
883 const struct of_device_id *of_id;
884 struct device_node *display_np;
885 int ret, i;
886 int bytes_per_pixel;
887
888 dev_info(&pdev->dev, "i.MX Framebuffer driver\n");
889
890 ret = imxfb_setup();
891 if (ret < 0)
892 return ret;
893
894 of_id = of_match_device(matches: imxfb_of_dev_id, dev: &pdev->dev);
895 if (of_id)
896 pdev->id_entry = of_id->data;
897
898 info = framebuffer_alloc(size: sizeof(struct imxfb_info), dev: &pdev->dev);
899 if (!info)
900 return -ENOMEM;
901
902 fbi = info->par;
903
904 platform_set_drvdata(pdev, data: info);
905
906 ret = imxfb_init_fbinfo(pdev);
907 if (ret < 0)
908 goto failed_init;
909
910 fb_mode = NULL;
911
912 display_np = of_parse_phandle(np: pdev->dev.of_node, phandle_name: "display", index: 0);
913 if (!display_np) {
914 dev_err(&pdev->dev, "No display defined in devicetree\n");
915 ret = -EINVAL;
916 goto failed_init;
917 }
918
919 /*
920 * imxfb does not support more modes, we choose only the native
921 * mode.
922 */
923 fbi->num_modes = 1;
924
925 fbi->mode = devm_kzalloc(dev: &pdev->dev,
926 size: sizeof(struct imx_fb_videomode), GFP_KERNEL);
927 if (!fbi->mode) {
928 ret = -ENOMEM;
929 of_node_put(node: display_np);
930 goto failed_init;
931 }
932
933 ret = imxfb_of_read_mode(dev: &pdev->dev, np: display_np, imxfb_mode: fbi->mode);
934 of_node_put(node: display_np);
935 if (ret)
936 goto failed_init;
937
938 /*
939 * Calculate maximum bytes used per pixel. In most cases this should
940 * be the same as m->bpp/8
941 */
942 m = &fbi->mode[0];
943 bytes_per_pixel = (m->bpp + 7) / 8;
944 for (i = 0; i < fbi->num_modes; i++, m++)
945 info->fix.smem_len = max_t(size_t, info->fix.smem_len,
946 m->mode.xres * m->mode.yres * bytes_per_pixel);
947
948 fbi->clk_ipg = devm_clk_get(dev: &pdev->dev, id: "ipg");
949 if (IS_ERR(ptr: fbi->clk_ipg)) {
950 ret = PTR_ERR(ptr: fbi->clk_ipg);
951 goto failed_init;
952 }
953
954 /*
955 * The LCDC controller does not have an enable bit. The
956 * controller starts directly when the clocks are enabled.
957 * If the clocks are enabled when the controller is not yet
958 * programmed with proper register values (enabled at the
959 * bootloader, for example) then it just goes into some undefined
960 * state.
961 * To avoid this issue, let's enable and disable LCDC IPG clock
962 * so that we force some kind of 'reset' to the LCDC block.
963 */
964 ret = clk_prepare_enable(clk: fbi->clk_ipg);
965 if (ret)
966 goto failed_init;
967 clk_disable_unprepare(clk: fbi->clk_ipg);
968
969 fbi->clk_ahb = devm_clk_get(dev: &pdev->dev, id: "ahb");
970 if (IS_ERR(ptr: fbi->clk_ahb)) {
971 ret = PTR_ERR(ptr: fbi->clk_ahb);
972 goto failed_init;
973 }
974
975 fbi->clk_per = devm_clk_get(dev: &pdev->dev, id: "per");
976 if (IS_ERR(ptr: fbi->clk_per)) {
977 ret = PTR_ERR(ptr: fbi->clk_per);
978 goto failed_init;
979 }
980
981 fbi->regs = devm_platform_ioremap_resource(pdev, index: 0);
982 if (IS_ERR(ptr: fbi->regs)) {
983 ret = PTR_ERR(ptr: fbi->regs);
984 goto failed_init;
985 }
986
987 fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
988 info->screen_buffer = dma_alloc_wc(dev: &pdev->dev, size: fbi->map_size,
989 dma_addr: &fbi->map_dma, GFP_KERNEL);
990 if (!info->screen_buffer) {
991 dev_err(&pdev->dev, "Failed to allocate video RAM\n");
992 ret = -ENOMEM;
993 goto failed_init;
994 }
995
996 info->fix.smem_start = fbi->map_dma;
997
998 INIT_LIST_HEAD(list: &info->modelist);
999 for (i = 0; i < fbi->num_modes; i++) {
1000 ret = fb_add_videomode(mode: &fbi->mode[i].mode, head: &info->modelist);
1001 if (ret) {
1002 dev_err(&pdev->dev, "Failed to add videomode\n");
1003 goto failed_cmap;
1004 }
1005 }
1006
1007 /*
1008 * This makes sure that our colour bitfield
1009 * descriptors are correctly initialised.
1010 */
1011 imxfb_check_var(var: &info->var, info);
1012
1013 /*
1014 * For modes > 8bpp, the color map is bypassed.
1015 * Therefore, 256 entries are enough.
1016 */
1017 ret = fb_alloc_cmap(cmap: &info->cmap, len: 256, transp: 0);
1018 if (ret < 0)
1019 goto failed_cmap;
1020
1021 imxfb_set_par(info);
1022
1023 fbi->lcd_pwr = devm_regulator_get(dev: &pdev->dev, id: "lcd");
1024 if (PTR_ERR(ptr: fbi->lcd_pwr) == -EPROBE_DEFER) {
1025 ret = -EPROBE_DEFER;
1026 goto failed_lcd;
1027 }
1028
1029 lcd = devm_lcd_device_register(dev: &pdev->dev, name: "imxfb-lcd", parent: &pdev->dev, devdata: fbi,
1030 ops: &imxfb_lcd_ops);
1031 if (IS_ERR(ptr: lcd)) {
1032 ret = PTR_ERR(ptr: lcd);
1033 goto failed_lcd;
1034 }
1035
1036 lcd->props.max_contrast = 0xff;
1037
1038 info->lcd_dev = lcd;
1039
1040 ret = register_framebuffer(fb_info: info);
1041 if (ret < 0) {
1042 dev_err(&pdev->dev, "failed to register framebuffer\n");
1043 goto failed_lcd;
1044 }
1045
1046 imxfb_enable_controller(fbi);
1047
1048 return 0;
1049
1050failed_lcd:
1051 fb_dealloc_cmap(cmap: &info->cmap);
1052failed_cmap:
1053 dma_free_wc(dev: &pdev->dev, size: fbi->map_size, cpu_addr: info->screen_buffer,
1054 dma_addr: fbi->map_dma);
1055failed_init:
1056 framebuffer_release(info);
1057 return ret;
1058}
1059
1060static void imxfb_remove(struct platform_device *pdev)
1061{
1062 struct fb_info *info = platform_get_drvdata(pdev);
1063 struct imxfb_info *fbi = info->par;
1064
1065 imxfb_disable_controller(fbi);
1066
1067 unregister_framebuffer(fb_info: info);
1068 fb_dealloc_cmap(cmap: &info->cmap);
1069 dma_free_wc(dev: &pdev->dev, size: fbi->map_size, cpu_addr: info->screen_buffer,
1070 dma_addr: fbi->map_dma);
1071 framebuffer_release(info);
1072}
1073
1074static int imxfb_suspend(struct device *dev)
1075{
1076 struct fb_info *info = dev_get_drvdata(dev);
1077 struct imxfb_info *fbi = info->par;
1078
1079 imxfb_disable_controller(fbi);
1080
1081 return 0;
1082}
1083
1084static int imxfb_resume(struct device *dev)
1085{
1086 struct fb_info *info = dev_get_drvdata(dev);
1087 struct imxfb_info *fbi = info->par;
1088
1089 imxfb_enable_controller(fbi);
1090
1091 return 0;
1092}
1093
1094static DEFINE_SIMPLE_DEV_PM_OPS(imxfb_pm_ops, imxfb_suspend, imxfb_resume);
1095
1096static struct platform_driver imxfb_driver = {
1097 .driver = {
1098 .name = DRIVER_NAME,
1099 .of_match_table = imxfb_of_dev_id,
1100 .pm = pm_sleep_ptr(&imxfb_pm_ops),
1101 },
1102 .probe = imxfb_probe,
1103 .remove = imxfb_remove,
1104 .id_table = imxfb_devtype,
1105};
1106module_platform_driver(imxfb_driver);
1107
1108MODULE_DESCRIPTION("Freescale i.MX framebuffer driver");
1109MODULE_AUTHOR("Sascha Hauer, Pengutronix");
1110MODULE_LICENSE("GPL");
1111

source code of linux/drivers/video/fbdev/imxfb.c