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f0a523b5 SH |
1 | /* |
2 | * Copyright (C) 2010 Juergen Beisert, Pengutronix | |
3 | * | |
4 | * This code is based on: | |
5 | * Author: Vitaly Wool <vital@embeddedalley.com> | |
6 | * | |
7 | * Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved. | |
8 | * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved. | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version 2 | |
13 | * of the License, or (at your option) any later version. | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | */ | |
19 | ||
20 | #define DRIVER_NAME "mxsfb" | |
21 | ||
22 | /** | |
23 | * @file | |
24 | * @brief LCDIF driver for i.MX23 and i.MX28 | |
25 | * | |
26 | * The LCDIF support four modes of operation | |
27 | * - MPU interface (to drive smart displays) -> not supported yet | |
28 | * - VSYNC interface (like MPU interface plus Vsync) -> not supported yet | |
29 | * - Dotclock interface (to drive LC displays with RGB data and sync signals) | |
30 | * - DVI (to drive ITU-R BT656) -> not supported yet | |
31 | * | |
32 | * This driver depends on a correct setup of the pins used for this purpose | |
33 | * (platform specific). | |
34 | * | |
35 | * For the developer: Don't forget to set the data bus width to the display | |
36 | * in the imx_fb_videomode structure. You will else end up with ugly colours. | |
37 | * If you fight against jitter you can vary the clock delay. This is a feature | |
38 | * of the i.MX28 and you can vary it between 2 ns ... 8 ns in 2 ns steps. Give | |
39 | * the required value in the imx_fb_videomode structure. | |
40 | */ | |
41 | ||
36893674 | 42 | #include <linux/module.h> |
f0a523b5 | 43 | #include <linux/kernel.h> |
73fc610f | 44 | #include <linux/of_device.h> |
f0a523b5 SH |
45 | #include <linux/platform_device.h> |
46 | #include <linux/clk.h> | |
47 | #include <linux/dma-mapping.h> | |
48 | #include <linux/io.h> | |
c8b5cfc8 | 49 | #include <linux/fb.h> |
4344429d | 50 | #include <linux/regulator/consumer.h> |
d7321df3 | 51 | #include <video/of_display_timing.h> |
838bdf72 | 52 | #include <video/of_videomode.h> |
66940653 | 53 | #include <video/videomode.h> |
f0a523b5 SH |
54 | |
55 | #define REG_SET 4 | |
56 | #define REG_CLR 8 | |
57 | ||
58 | #define LCDC_CTRL 0x00 | |
59 | #define LCDC_CTRL1 0x10 | |
60 | #define LCDC_V4_CTRL2 0x20 | |
61 | #define LCDC_V3_TRANSFER_COUNT 0x20 | |
62 | #define LCDC_V4_TRANSFER_COUNT 0x30 | |
63 | #define LCDC_V4_CUR_BUF 0x40 | |
64 | #define LCDC_V4_NEXT_BUF 0x50 | |
65 | #define LCDC_V3_CUR_BUF 0x30 | |
66 | #define LCDC_V3_NEXT_BUF 0x40 | |
67 | #define LCDC_TIMING 0x60 | |
68 | #define LCDC_VDCTRL0 0x70 | |
69 | #define LCDC_VDCTRL1 0x80 | |
70 | #define LCDC_VDCTRL2 0x90 | |
71 | #define LCDC_VDCTRL3 0xa0 | |
72 | #define LCDC_VDCTRL4 0xb0 | |
73 | #define LCDC_DVICTRL0 0xc0 | |
74 | #define LCDC_DVICTRL1 0xd0 | |
75 | #define LCDC_DVICTRL2 0xe0 | |
76 | #define LCDC_DVICTRL3 0xf0 | |
77 | #define LCDC_DVICTRL4 0x100 | |
78 | #define LCDC_V4_DATA 0x180 | |
79 | #define LCDC_V3_DATA 0x1b0 | |
80 | #define LCDC_V4_DEBUG0 0x1d0 | |
81 | #define LCDC_V3_DEBUG0 0x1f0 | |
82 | ||
83 | #define CTRL_SFTRST (1 << 31) | |
84 | #define CTRL_CLKGATE (1 << 30) | |
85 | #define CTRL_BYPASS_COUNT (1 << 19) | |
86 | #define CTRL_VSYNC_MODE (1 << 18) | |
87 | #define CTRL_DOTCLK_MODE (1 << 17) | |
88 | #define CTRL_DATA_SELECT (1 << 16) | |
89 | #define CTRL_SET_BUS_WIDTH(x) (((x) & 0x3) << 10) | |
90 | #define CTRL_GET_BUS_WIDTH(x) (((x) >> 10) & 0x3) | |
91 | #define CTRL_SET_WORD_LENGTH(x) (((x) & 0x3) << 8) | |
92 | #define CTRL_GET_WORD_LENGTH(x) (((x) >> 8) & 0x3) | |
93 | #define CTRL_MASTER (1 << 5) | |
94 | #define CTRL_DF16 (1 << 3) | |
95 | #define CTRL_DF18 (1 << 2) | |
96 | #define CTRL_DF24 (1 << 1) | |
97 | #define CTRL_RUN (1 << 0) | |
98 | ||
99 | #define CTRL1_FIFO_CLEAR (1 << 21) | |
100 | #define CTRL1_SET_BYTE_PACKAGING(x) (((x) & 0xf) << 16) | |
101 | #define CTRL1_GET_BYTE_PACKAGING(x) (((x) >> 16) & 0xf) | |
102 | ||
103 | #define TRANSFER_COUNT_SET_VCOUNT(x) (((x) & 0xffff) << 16) | |
104 | #define TRANSFER_COUNT_GET_VCOUNT(x) (((x) >> 16) & 0xffff) | |
105 | #define TRANSFER_COUNT_SET_HCOUNT(x) ((x) & 0xffff) | |
106 | #define TRANSFER_COUNT_GET_HCOUNT(x) ((x) & 0xffff) | |
107 | ||
108 | ||
109 | #define VDCTRL0_ENABLE_PRESENT (1 << 28) | |
110 | #define VDCTRL0_VSYNC_ACT_HIGH (1 << 27) | |
111 | #define VDCTRL0_HSYNC_ACT_HIGH (1 << 26) | |
c8b5cfc8 | 112 | #define VDCTRL0_DOTCLK_ACT_FALLING (1 << 25) |
f0a523b5 SH |
113 | #define VDCTRL0_ENABLE_ACT_HIGH (1 << 24) |
114 | #define VDCTRL0_VSYNC_PERIOD_UNIT (1 << 21) | |
115 | #define VDCTRL0_VSYNC_PULSE_WIDTH_UNIT (1 << 20) | |
116 | #define VDCTRL0_HALF_LINE (1 << 19) | |
117 | #define VDCTRL0_HALF_LINE_MODE (1 << 18) | |
118 | #define VDCTRL0_SET_VSYNC_PULSE_WIDTH(x) ((x) & 0x3ffff) | |
119 | #define VDCTRL0_GET_VSYNC_PULSE_WIDTH(x) ((x) & 0x3ffff) | |
120 | ||
121 | #define VDCTRL2_SET_HSYNC_PERIOD(x) ((x) & 0x3ffff) | |
122 | #define VDCTRL2_GET_HSYNC_PERIOD(x) ((x) & 0x3ffff) | |
123 | ||
124 | #define VDCTRL3_MUX_SYNC_SIGNALS (1 << 29) | |
125 | #define VDCTRL3_VSYNC_ONLY (1 << 28) | |
126 | #define SET_HOR_WAIT_CNT(x) (((x) & 0xfff) << 16) | |
127 | #define GET_HOR_WAIT_CNT(x) (((x) >> 16) & 0xfff) | |
128 | #define SET_VERT_WAIT_CNT(x) ((x) & 0xffff) | |
129 | #define GET_VERT_WAIT_CNT(x) ((x) & 0xffff) | |
130 | ||
131 | #define VDCTRL4_SET_DOTCLK_DLY(x) (((x) & 0x7) << 29) /* v4 only */ | |
132 | #define VDCTRL4_GET_DOTCLK_DLY(x) (((x) >> 29) & 0x7) /* v4 only */ | |
133 | #define VDCTRL4_SYNC_SIGNALS_ON (1 << 18) | |
134 | #define SET_DOTCLK_H_VALID_DATA_CNT(x) ((x) & 0x3ffff) | |
135 | ||
136 | #define DEBUG0_HSYNC (1 < 26) | |
137 | #define DEBUG0_VSYNC (1 < 25) | |
138 | ||
139 | #define MIN_XRES 120 | |
140 | #define MIN_YRES 120 | |
141 | ||
142 | #define RED 0 | |
143 | #define GREEN 1 | |
144 | #define BLUE 2 | |
145 | #define TRANSP 3 | |
146 | ||
c8b5cfc8 SG |
147 | #define STMLCDIF_8BIT 1 /** pixel data bus to the display is of 8 bit width */ |
148 | #define STMLCDIF_16BIT 0 /** pixel data bus to the display is of 16 bit width */ | |
149 | #define STMLCDIF_18BIT 2 /** pixel data bus to the display is of 18 bit width */ | |
150 | #define STMLCDIF_24BIT 3 /** pixel data bus to the display is of 24 bit width */ | |
151 | ||
152 | #define MXSFB_SYNC_DATA_ENABLE_HIGH_ACT (1 << 6) | |
153 | #define MXSFB_SYNC_DOTCLK_FALLING_ACT (1 << 7) /* negtive edge sampling */ | |
154 | ||
f0a523b5 SH |
155 | enum mxsfb_devtype { |
156 | MXSFB_V3, | |
157 | MXSFB_V4, | |
158 | }; | |
159 | ||
160 | /* CPU dependent register offsets */ | |
161 | struct mxsfb_devdata { | |
162 | unsigned transfer_count; | |
163 | unsigned cur_buf; | |
164 | unsigned next_buf; | |
165 | unsigned debug0; | |
166 | unsigned hs_wdth_mask; | |
167 | unsigned hs_wdth_shift; | |
168 | unsigned ipversion; | |
169 | }; | |
170 | ||
171 | struct mxsfb_info { | |
172 | struct fb_info fb_info; | |
173 | struct platform_device *pdev; | |
174 | struct clk *clk; | |
175 | void __iomem *base; /* registers */ | |
176 | unsigned allocated_size; | |
177 | int enabled; | |
178 | unsigned ld_intf_width; | |
179 | unsigned dotclk_delay; | |
180 | const struct mxsfb_devdata *devdata; | |
6a15075e | 181 | u32 sync; |
4344429d | 182 | struct regulator *reg_lcd; |
f0a523b5 SH |
183 | }; |
184 | ||
185 | #define mxsfb_is_v3(host) (host->devdata->ipversion == 3) | |
186 | #define mxsfb_is_v4(host) (host->devdata->ipversion == 4) | |
187 | ||
188 | static const struct mxsfb_devdata mxsfb_devdata[] = { | |
189 | [MXSFB_V3] = { | |
190 | .transfer_count = LCDC_V3_TRANSFER_COUNT, | |
191 | .cur_buf = LCDC_V3_CUR_BUF, | |
192 | .next_buf = LCDC_V3_NEXT_BUF, | |
193 | .debug0 = LCDC_V3_DEBUG0, | |
194 | .hs_wdth_mask = 0xff, | |
195 | .hs_wdth_shift = 24, | |
196 | .ipversion = 3, | |
197 | }, | |
198 | [MXSFB_V4] = { | |
199 | .transfer_count = LCDC_V4_TRANSFER_COUNT, | |
200 | .cur_buf = LCDC_V4_CUR_BUF, | |
201 | .next_buf = LCDC_V4_NEXT_BUF, | |
202 | .debug0 = LCDC_V4_DEBUG0, | |
203 | .hs_wdth_mask = 0x3fff, | |
204 | .hs_wdth_shift = 18, | |
205 | .ipversion = 4, | |
206 | }, | |
207 | }; | |
208 | ||
209 | #define to_imxfb_host(x) (container_of(x, struct mxsfb_info, fb_info)) | |
210 | ||
211 | /* mask and shift depends on architecture */ | |
212 | static inline u32 set_hsync_pulse_width(struct mxsfb_info *host, unsigned val) | |
213 | { | |
214 | return (val & host->devdata->hs_wdth_mask) << | |
215 | host->devdata->hs_wdth_shift; | |
216 | } | |
217 | ||
218 | static inline u32 get_hsync_pulse_width(struct mxsfb_info *host, unsigned val) | |
219 | { | |
220 | return (val >> host->devdata->hs_wdth_shift) & | |
221 | host->devdata->hs_wdth_mask; | |
222 | } | |
223 | ||
224 | static const struct fb_bitfield def_rgb565[] = { | |
225 | [RED] = { | |
226 | .offset = 11, | |
227 | .length = 5, | |
228 | }, | |
229 | [GREEN] = { | |
230 | .offset = 5, | |
231 | .length = 6, | |
232 | }, | |
233 | [BLUE] = { | |
234 | .offset = 0, | |
235 | .length = 5, | |
236 | }, | |
237 | [TRANSP] = { /* no support for transparency */ | |
238 | .length = 0, | |
239 | } | |
240 | }; | |
241 | ||
f0a523b5 SH |
242 | static const struct fb_bitfield def_rgb888[] = { |
243 | [RED] = { | |
244 | .offset = 16, | |
245 | .length = 8, | |
246 | }, | |
247 | [GREEN] = { | |
248 | .offset = 8, | |
249 | .length = 8, | |
250 | }, | |
251 | [BLUE] = { | |
252 | .offset = 0, | |
253 | .length = 8, | |
254 | }, | |
255 | [TRANSP] = { /* no support for transparency */ | |
256 | .length = 0, | |
257 | } | |
258 | }; | |
259 | ||
260 | static inline unsigned chan_to_field(unsigned chan, struct fb_bitfield *bf) | |
261 | { | |
262 | chan &= 0xffff; | |
263 | chan >>= 16 - bf->length; | |
264 | return chan << bf->offset; | |
265 | } | |
266 | ||
267 | static int mxsfb_check_var(struct fb_var_screeninfo *var, | |
268 | struct fb_info *fb_info) | |
269 | { | |
270 | struct mxsfb_info *host = to_imxfb_host(fb_info); | |
271 | const struct fb_bitfield *rgb = NULL; | |
272 | ||
273 | if (var->xres < MIN_XRES) | |
274 | var->xres = MIN_XRES; | |
275 | if (var->yres < MIN_YRES) | |
276 | var->yres = MIN_YRES; | |
277 | ||
278 | var->xres_virtual = var->xres; | |
279 | ||
280 | var->yres_virtual = var->yres; | |
281 | ||
282 | switch (var->bits_per_pixel) { | |
283 | case 16: | |
284 | /* always expect RGB 565 */ | |
285 | rgb = def_rgb565; | |
286 | break; | |
287 | case 32: | |
288 | switch (host->ld_intf_width) { | |
289 | case STMLCDIF_8BIT: | |
290 | pr_debug("Unsupported LCD bus width mapping\n"); | |
291 | break; | |
292 | case STMLCDIF_16BIT: | |
293 | case STMLCDIF_18BIT: | |
f0a523b5 SH |
294 | case STMLCDIF_24BIT: |
295 | /* real 24 bit */ | |
296 | rgb = def_rgb888; | |
297 | break; | |
298 | } | |
299 | break; | |
300 | default: | |
18dd44d8 | 301 | pr_err("Unsupported colour depth: %u\n", var->bits_per_pixel); |
f0a523b5 SH |
302 | return -EINVAL; |
303 | } | |
304 | ||
305 | /* | |
306 | * Copy the RGB parameters for this display | |
307 | * from the machine specific parameters. | |
308 | */ | |
309 | var->red = rgb[RED]; | |
310 | var->green = rgb[GREEN]; | |
311 | var->blue = rgb[BLUE]; | |
312 | var->transp = rgb[TRANSP]; | |
313 | ||
314 | return 0; | |
315 | } | |
316 | ||
317 | static void mxsfb_enable_controller(struct fb_info *fb_info) | |
318 | { | |
319 | struct mxsfb_info *host = to_imxfb_host(fb_info); | |
320 | u32 reg; | |
4344429d | 321 | int ret; |
f0a523b5 SH |
322 | |
323 | dev_dbg(&host->pdev->dev, "%s\n", __func__); | |
324 | ||
4344429d FE |
325 | if (host->reg_lcd) { |
326 | ret = regulator_enable(host->reg_lcd); | |
327 | if (ret) { | |
328 | dev_err(&host->pdev->dev, | |
329 | "lcd regulator enable failed: %d\n", ret); | |
330 | return; | |
331 | } | |
332 | } | |
333 | ||
ca4c22d3 | 334 | clk_prepare_enable(host->clk); |
f0a523b5 SH |
335 | clk_set_rate(host->clk, PICOS2KHZ(fb_info->var.pixclock) * 1000U); |
336 | ||
337 | /* if it was disabled, re-enable the mode again */ | |
338 | writel(CTRL_DOTCLK_MODE, host->base + LCDC_CTRL + REG_SET); | |
339 | ||
340 | /* enable the SYNC signals first, then the DMA engine */ | |
341 | reg = readl(host->base + LCDC_VDCTRL4); | |
342 | reg |= VDCTRL4_SYNC_SIGNALS_ON; | |
343 | writel(reg, host->base + LCDC_VDCTRL4); | |
344 | ||
345 | writel(CTRL_RUN, host->base + LCDC_CTRL + REG_SET); | |
346 | ||
347 | host->enabled = 1; | |
348 | } | |
349 | ||
350 | static void mxsfb_disable_controller(struct fb_info *fb_info) | |
351 | { | |
352 | struct mxsfb_info *host = to_imxfb_host(fb_info); | |
353 | unsigned loop; | |
354 | u32 reg; | |
4344429d | 355 | int ret; |
f0a523b5 SH |
356 | |
357 | dev_dbg(&host->pdev->dev, "%s\n", __func__); | |
358 | ||
359 | /* | |
360 | * Even if we disable the controller here, it will still continue | |
361 | * until its FIFOs are running out of data | |
362 | */ | |
363 | writel(CTRL_DOTCLK_MODE, host->base + LCDC_CTRL + REG_CLR); | |
364 | ||
365 | loop = 1000; | |
366 | while (loop) { | |
367 | reg = readl(host->base + LCDC_CTRL); | |
368 | if (!(reg & CTRL_RUN)) | |
369 | break; | |
370 | loop--; | |
371 | } | |
372 | ||
6c1ecba8 LW |
373 | reg = readl(host->base + LCDC_VDCTRL4); |
374 | writel(reg & ~VDCTRL4_SYNC_SIGNALS_ON, host->base + LCDC_VDCTRL4); | |
f0a523b5 | 375 | |
ca4c22d3 | 376 | clk_disable_unprepare(host->clk); |
f0a523b5 SH |
377 | |
378 | host->enabled = 0; | |
4344429d FE |
379 | |
380 | if (host->reg_lcd) { | |
381 | ret = regulator_disable(host->reg_lcd); | |
382 | if (ret) | |
383 | dev_err(&host->pdev->dev, | |
384 | "lcd regulator disable failed: %d\n", ret); | |
385 | } | |
f0a523b5 SH |
386 | } |
387 | ||
388 | static int mxsfb_set_par(struct fb_info *fb_info) | |
389 | { | |
390 | struct mxsfb_info *host = to_imxfb_host(fb_info); | |
391 | u32 ctrl, vdctrl0, vdctrl4; | |
392 | int line_size, fb_size; | |
393 | int reenable = 0; | |
394 | ||
395 | line_size = fb_info->var.xres * (fb_info->var.bits_per_pixel >> 3); | |
396 | fb_size = fb_info->var.yres_virtual * line_size; | |
397 | ||
398 | if (fb_size > fb_info->fix.smem_len) | |
399 | return -ENOMEM; | |
400 | ||
401 | fb_info->fix.line_length = line_size; | |
402 | ||
403 | /* | |
404 | * It seems, you can't re-program the controller if it is still running. | |
405 | * This may lead into shifted pictures (FIFO issue?). | |
406 | * So, first stop the controller and drain its FIFOs | |
407 | */ | |
408 | if (host->enabled) { | |
409 | reenable = 1; | |
410 | mxsfb_disable_controller(fb_info); | |
411 | } | |
412 | ||
413 | /* clear the FIFOs */ | |
414 | writel(CTRL1_FIFO_CLEAR, host->base + LCDC_CTRL1 + REG_SET); | |
415 | ||
416 | ctrl = CTRL_BYPASS_COUNT | CTRL_MASTER | | |
6eab04a8 | 417 | CTRL_SET_BUS_WIDTH(host->ld_intf_width); |
f0a523b5 SH |
418 | |
419 | switch (fb_info->var.bits_per_pixel) { | |
420 | case 16: | |
421 | dev_dbg(&host->pdev->dev, "Setting up RGB565 mode\n"); | |
422 | ctrl |= CTRL_SET_WORD_LENGTH(0); | |
423 | writel(CTRL1_SET_BYTE_PACKAGING(0xf), host->base + LCDC_CTRL1); | |
424 | break; | |
425 | case 32: | |
426 | dev_dbg(&host->pdev->dev, "Setting up RGB888/666 mode\n"); | |
427 | ctrl |= CTRL_SET_WORD_LENGTH(3); | |
428 | switch (host->ld_intf_width) { | |
429 | case STMLCDIF_8BIT: | |
18dd44d8 | 430 | dev_err(&host->pdev->dev, |
f0a523b5 SH |
431 | "Unsupported LCD bus width mapping\n"); |
432 | return -EINVAL; | |
433 | case STMLCDIF_16BIT: | |
434 | case STMLCDIF_18BIT: | |
f0a523b5 SH |
435 | case STMLCDIF_24BIT: |
436 | /* real 24 bit */ | |
437 | break; | |
438 | } | |
439 | /* do not use packed pixels = one pixel per word instead */ | |
440 | writel(CTRL1_SET_BYTE_PACKAGING(0x7), host->base + LCDC_CTRL1); | |
441 | break; | |
442 | default: | |
18dd44d8 | 443 | dev_err(&host->pdev->dev, "Unhandled color depth of %u\n", |
f0a523b5 SH |
444 | fb_info->var.bits_per_pixel); |
445 | return -EINVAL; | |
446 | } | |
447 | ||
448 | writel(ctrl, host->base + LCDC_CTRL); | |
449 | ||
450 | writel(TRANSFER_COUNT_SET_VCOUNT(fb_info->var.yres) | | |
451 | TRANSFER_COUNT_SET_HCOUNT(fb_info->var.xres), | |
452 | host->base + host->devdata->transfer_count); | |
453 | ||
454 | vdctrl0 = VDCTRL0_ENABLE_PRESENT | /* always in DOTCLOCK mode */ | |
455 | VDCTRL0_VSYNC_PERIOD_UNIT | | |
456 | VDCTRL0_VSYNC_PULSE_WIDTH_UNIT | | |
457 | VDCTRL0_SET_VSYNC_PULSE_WIDTH(fb_info->var.vsync_len); | |
458 | if (fb_info->var.sync & FB_SYNC_HOR_HIGH_ACT) | |
459 | vdctrl0 |= VDCTRL0_HSYNC_ACT_HIGH; | |
460 | if (fb_info->var.sync & FB_SYNC_VERT_HIGH_ACT) | |
461 | vdctrl0 |= VDCTRL0_VSYNC_ACT_HIGH; | |
6a15075e | 462 | if (host->sync & MXSFB_SYNC_DATA_ENABLE_HIGH_ACT) |
f0a523b5 | 463 | vdctrl0 |= VDCTRL0_ENABLE_ACT_HIGH; |
c8b5cfc8 SG |
464 | if (host->sync & MXSFB_SYNC_DOTCLK_FALLING_ACT) |
465 | vdctrl0 |= VDCTRL0_DOTCLK_ACT_FALLING; | |
f0a523b5 SH |
466 | |
467 | writel(vdctrl0, host->base + LCDC_VDCTRL0); | |
468 | ||
469 | /* frame length in lines */ | |
470 | writel(fb_info->var.upper_margin + fb_info->var.vsync_len + | |
471 | fb_info->var.lower_margin + fb_info->var.yres, | |
472 | host->base + LCDC_VDCTRL1); | |
473 | ||
474 | /* line length in units of clocks or pixels */ | |
475 | writel(set_hsync_pulse_width(host, fb_info->var.hsync_len) | | |
476 | VDCTRL2_SET_HSYNC_PERIOD(fb_info->var.left_margin + | |
477 | fb_info->var.hsync_len + fb_info->var.right_margin + | |
478 | fb_info->var.xres), | |
479 | host->base + LCDC_VDCTRL2); | |
480 | ||
481 | writel(SET_HOR_WAIT_CNT(fb_info->var.left_margin + | |
482 | fb_info->var.hsync_len) | | |
483 | SET_VERT_WAIT_CNT(fb_info->var.upper_margin + | |
484 | fb_info->var.vsync_len), | |
485 | host->base + LCDC_VDCTRL3); | |
486 | ||
487 | vdctrl4 = SET_DOTCLK_H_VALID_DATA_CNT(fb_info->var.xres); | |
488 | if (mxsfb_is_v4(host)) | |
489 | vdctrl4 |= VDCTRL4_SET_DOTCLK_DLY(host->dotclk_delay); | |
490 | writel(vdctrl4, host->base + LCDC_VDCTRL4); | |
491 | ||
492 | writel(fb_info->fix.smem_start + | |
493 | fb_info->fix.line_length * fb_info->var.yoffset, | |
494 | host->base + host->devdata->next_buf); | |
495 | ||
496 | if (reenable) | |
497 | mxsfb_enable_controller(fb_info); | |
498 | ||
499 | return 0; | |
500 | } | |
501 | ||
502 | static int mxsfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, | |
503 | u_int transp, struct fb_info *fb_info) | |
504 | { | |
505 | unsigned int val; | |
506 | int ret = -EINVAL; | |
507 | ||
508 | /* | |
509 | * If greyscale is true, then we convert the RGB value | |
510 | * to greyscale no matter what visual we are using. | |
511 | */ | |
512 | if (fb_info->var.grayscale) | |
513 | red = green = blue = (19595 * red + 38470 * green + | |
514 | 7471 * blue) >> 16; | |
515 | ||
516 | switch (fb_info->fix.visual) { | |
517 | case FB_VISUAL_TRUECOLOR: | |
518 | /* | |
519 | * 12 or 16-bit True Colour. We encode the RGB value | |
520 | * according to the RGB bitfield information. | |
521 | */ | |
522 | if (regno < 16) { | |
523 | u32 *pal = fb_info->pseudo_palette; | |
524 | ||
525 | val = chan_to_field(red, &fb_info->var.red); | |
526 | val |= chan_to_field(green, &fb_info->var.green); | |
527 | val |= chan_to_field(blue, &fb_info->var.blue); | |
528 | ||
529 | pal[regno] = val; | |
530 | ret = 0; | |
531 | } | |
532 | break; | |
533 | ||
534 | case FB_VISUAL_STATIC_PSEUDOCOLOR: | |
535 | case FB_VISUAL_PSEUDOCOLOR: | |
536 | break; | |
537 | } | |
538 | ||
539 | return ret; | |
540 | } | |
541 | ||
542 | static int mxsfb_blank(int blank, struct fb_info *fb_info) | |
543 | { | |
544 | struct mxsfb_info *host = to_imxfb_host(fb_info); | |
545 | ||
546 | switch (blank) { | |
547 | case FB_BLANK_POWERDOWN: | |
548 | case FB_BLANK_VSYNC_SUSPEND: | |
549 | case FB_BLANK_HSYNC_SUSPEND: | |
550 | case FB_BLANK_NORMAL: | |
551 | if (host->enabled) | |
552 | mxsfb_disable_controller(fb_info); | |
553 | break; | |
554 | ||
555 | case FB_BLANK_UNBLANK: | |
556 | if (!host->enabled) | |
557 | mxsfb_enable_controller(fb_info); | |
558 | break; | |
559 | } | |
560 | return 0; | |
561 | } | |
562 | ||
563 | static int mxsfb_pan_display(struct fb_var_screeninfo *var, | |
564 | struct fb_info *fb_info) | |
565 | { | |
566 | struct mxsfb_info *host = to_imxfb_host(fb_info); | |
567 | unsigned offset; | |
568 | ||
569 | if (var->xoffset != 0) | |
570 | return -EINVAL; | |
571 | ||
572 | offset = fb_info->fix.line_length * var->yoffset; | |
573 | ||
574 | /* update on next VSYNC */ | |
575 | writel(fb_info->fix.smem_start + offset, | |
576 | host->base + host->devdata->next_buf); | |
577 | ||
578 | return 0; | |
579 | } | |
580 | ||
581 | static struct fb_ops mxsfb_ops = { | |
582 | .owner = THIS_MODULE, | |
583 | .fb_check_var = mxsfb_check_var, | |
584 | .fb_set_par = mxsfb_set_par, | |
585 | .fb_setcolreg = mxsfb_setcolreg, | |
586 | .fb_blank = mxsfb_blank, | |
587 | .fb_pan_display = mxsfb_pan_display, | |
588 | .fb_fillrect = cfb_fillrect, | |
589 | .fb_copyarea = cfb_copyarea, | |
590 | .fb_imageblit = cfb_imageblit, | |
591 | }; | |
592 | ||
838bdf72 LW |
593 | static int mxsfb_restore_mode(struct mxsfb_info *host, |
594 | struct fb_videomode *vmode) | |
f0a523b5 SH |
595 | { |
596 | struct fb_info *fb_info = &host->fb_info; | |
597 | unsigned line_count; | |
598 | unsigned period; | |
599 | unsigned long pa, fbsize; | |
600 | int bits_per_pixel, ofs; | |
601 | u32 transfer_count, vdctrl0, vdctrl2, vdctrl3, vdctrl4, ctrl; | |
f0a523b5 SH |
602 | |
603 | /* Only restore the mode when the controller is running */ | |
604 | ctrl = readl(host->base + LCDC_CTRL); | |
605 | if (!(ctrl & CTRL_RUN)) | |
606 | return -EINVAL; | |
607 | ||
608 | vdctrl0 = readl(host->base + LCDC_VDCTRL0); | |
609 | vdctrl2 = readl(host->base + LCDC_VDCTRL2); | |
610 | vdctrl3 = readl(host->base + LCDC_VDCTRL3); | |
611 | vdctrl4 = readl(host->base + LCDC_VDCTRL4); | |
612 | ||
613 | transfer_count = readl(host->base + host->devdata->transfer_count); | |
614 | ||
838bdf72 LW |
615 | vmode->xres = TRANSFER_COUNT_GET_HCOUNT(transfer_count); |
616 | vmode->yres = TRANSFER_COUNT_GET_VCOUNT(transfer_count); | |
f0a523b5 SH |
617 | |
618 | switch (CTRL_GET_WORD_LENGTH(ctrl)) { | |
619 | case 0: | |
620 | bits_per_pixel = 16; | |
621 | break; | |
622 | case 3: | |
623 | bits_per_pixel = 32; | |
6d0bb818 | 624 | break; |
f0a523b5 SH |
625 | case 1: |
626 | default: | |
627 | return -EINVAL; | |
628 | } | |
629 | ||
630 | fb_info->var.bits_per_pixel = bits_per_pixel; | |
631 | ||
838bdf72 LW |
632 | vmode->pixclock = KHZ2PICOS(clk_get_rate(host->clk) / 1000U); |
633 | vmode->hsync_len = get_hsync_pulse_width(host, vdctrl2); | |
634 | vmode->left_margin = GET_HOR_WAIT_CNT(vdctrl3) - vmode->hsync_len; | |
635 | vmode->right_margin = VDCTRL2_GET_HSYNC_PERIOD(vdctrl2) - | |
636 | vmode->hsync_len - vmode->left_margin - vmode->xres; | |
637 | vmode->vsync_len = VDCTRL0_GET_VSYNC_PULSE_WIDTH(vdctrl0); | |
f0a523b5 | 638 | period = readl(host->base + LCDC_VDCTRL1); |
838bdf72 LW |
639 | vmode->upper_margin = GET_VERT_WAIT_CNT(vdctrl3) - vmode->vsync_len; |
640 | vmode->lower_margin = period - vmode->vsync_len - | |
641 | vmode->upper_margin - vmode->yres; | |
f0a523b5 | 642 | |
838bdf72 | 643 | vmode->vmode = FB_VMODE_NONINTERLACED; |
f0a523b5 | 644 | |
838bdf72 | 645 | vmode->sync = 0; |
f0a523b5 | 646 | if (vdctrl0 & VDCTRL0_HSYNC_ACT_HIGH) |
838bdf72 | 647 | vmode->sync |= FB_SYNC_HOR_HIGH_ACT; |
f0a523b5 | 648 | if (vdctrl0 & VDCTRL0_VSYNC_ACT_HIGH) |
838bdf72 | 649 | vmode->sync |= FB_SYNC_VERT_HIGH_ACT; |
f0a523b5 SH |
650 | |
651 | pr_debug("Reconstructed video mode:\n"); | |
652 | pr_debug("%dx%d, hsync: %u left: %u, right: %u, vsync: %u, upper: %u, lower: %u\n", | |
838bdf72 LW |
653 | vmode->xres, vmode->yres, vmode->hsync_len, vmode->left_margin, |
654 | vmode->right_margin, vmode->vsync_len, vmode->upper_margin, | |
655 | vmode->lower_margin); | |
656 | pr_debug("pixclk: %ldkHz\n", PICOS2KHZ(vmode->pixclock)); | |
f0a523b5 SH |
657 | |
658 | host->ld_intf_width = CTRL_GET_BUS_WIDTH(ctrl); | |
659 | host->dotclk_delay = VDCTRL4_GET_DOTCLK_DLY(vdctrl4); | |
660 | ||
838bdf72 | 661 | fb_info->fix.line_length = vmode->xres * (bits_per_pixel >> 3); |
f0a523b5 SH |
662 | |
663 | pa = readl(host->base + host->devdata->cur_buf); | |
838bdf72 | 664 | fbsize = fb_info->fix.line_length * vmode->yres; |
f0a523b5 SH |
665 | if (pa < fb_info->fix.smem_start) |
666 | return -EINVAL; | |
667 | if (pa + fbsize > fb_info->fix.smem_start + fb_info->fix.smem_len) | |
668 | return -EINVAL; | |
669 | ofs = pa - fb_info->fix.smem_start; | |
670 | if (ofs) { | |
671 | memmove(fb_info->screen_base, fb_info->screen_base + ofs, fbsize); | |
672 | writel(fb_info->fix.smem_start, host->base + host->devdata->next_buf); | |
673 | } | |
674 | ||
675 | line_count = fb_info->fix.smem_len / fb_info->fix.line_length; | |
676 | fb_info->fix.ypanstep = 1; | |
677 | ||
ca4c22d3 | 678 | clk_prepare_enable(host->clk); |
f0a523b5 SH |
679 | host->enabled = 1; |
680 | ||
681 | return 0; | |
682 | } | |
683 | ||
838bdf72 LW |
684 | static int mxsfb_init_fbinfo_dt(struct mxsfb_info *host, |
685 | struct fb_videomode *vmode) | |
66940653 SG |
686 | { |
687 | struct fb_info *fb_info = &host->fb_info; | |
688 | struct fb_var_screeninfo *var = &fb_info->var; | |
689 | struct device *dev = &host->pdev->dev; | |
690 | struct device_node *np = host->pdev->dev.of_node; | |
691 | struct device_node *display_np; | |
838bdf72 | 692 | struct videomode vm; |
66940653 | 693 | u32 width; |
838bdf72 | 694 | int ret; |
66940653 SG |
695 | |
696 | display_np = of_parse_phandle(np, "display", 0); | |
697 | if (!display_np) { | |
698 | dev_err(dev, "failed to find display phandle\n"); | |
699 | return -ENOENT; | |
700 | } | |
701 | ||
702 | ret = of_property_read_u32(display_np, "bus-width", &width); | |
703 | if (ret < 0) { | |
704 | dev_err(dev, "failed to get property bus-width\n"); | |
705 | goto put_display_node; | |
706 | } | |
707 | ||
708 | switch (width) { | |
709 | case 8: | |
710 | host->ld_intf_width = STMLCDIF_8BIT; | |
711 | break; | |
712 | case 16: | |
713 | host->ld_intf_width = STMLCDIF_16BIT; | |
714 | break; | |
715 | case 18: | |
716 | host->ld_intf_width = STMLCDIF_18BIT; | |
717 | break; | |
718 | case 24: | |
719 | host->ld_intf_width = STMLCDIF_24BIT; | |
720 | break; | |
721 | default: | |
722 | dev_err(dev, "invalid bus-width value\n"); | |
723 | ret = -EINVAL; | |
724 | goto put_display_node; | |
725 | } | |
726 | ||
727 | ret = of_property_read_u32(display_np, "bits-per-pixel", | |
728 | &var->bits_per_pixel); | |
729 | if (ret < 0) { | |
730 | dev_err(dev, "failed to get property bits-per-pixel\n"); | |
731 | goto put_display_node; | |
732 | } | |
733 | ||
838bdf72 LW |
734 | ret = of_get_videomode(display_np, &vm, OF_USE_NATIVE_MODE); |
735 | if (ret) { | |
736 | dev_err(dev, "failed to get videomode from DT\n"); | |
66940653 SG |
737 | goto put_display_node; |
738 | } | |
739 | ||
838bdf72 LW |
740 | ret = fb_videomode_from_videomode(&vm, vmode); |
741 | if (ret < 0) | |
66940653 | 742 | goto put_display_node; |
66940653 | 743 | |
838bdf72 LW |
744 | if (vm.flags & DISPLAY_FLAGS_DE_HIGH) |
745 | host->sync |= MXSFB_SYNC_DATA_ENABLE_HIGH_ACT; | |
746 | if (vm.flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE) | |
747 | host->sync |= MXSFB_SYNC_DOTCLK_FALLING_ACT; | |
66940653 | 748 | |
66940653 SG |
749 | put_display_node: |
750 | of_node_put(display_np); | |
751 | return ret; | |
752 | } | |
753 | ||
838bdf72 LW |
754 | static int mxsfb_init_fbinfo(struct mxsfb_info *host, |
755 | struct fb_videomode *vmode) | |
f0a523b5 | 756 | { |
838bdf72 | 757 | int ret; |
f0a523b5 SH |
758 | struct fb_info *fb_info = &host->fb_info; |
759 | struct fb_var_screeninfo *var = &fb_info->var; | |
f0a523b5 SH |
760 | dma_addr_t fb_phys; |
761 | void *fb_virt; | |
4aa02c7c | 762 | unsigned fb_size; |
f0a523b5 SH |
763 | |
764 | fb_info->fbops = &mxsfb_ops; | |
765 | fb_info->flags = FBINFO_FLAG_DEFAULT | FBINFO_READS_FAST; | |
766 | strlcpy(fb_info->fix.id, "mxs", sizeof(fb_info->fix.id)); | |
767 | fb_info->fix.type = FB_TYPE_PACKED_PIXELS; | |
768 | fb_info->fix.ypanstep = 1; | |
769 | fb_info->fix.visual = FB_VISUAL_TRUECOLOR, | |
770 | fb_info->fix.accel = FB_ACCEL_NONE; | |
771 | ||
838bdf72 | 772 | ret = mxsfb_init_fbinfo_dt(host, vmode); |
c8b5cfc8 SG |
773 | if (ret) |
774 | return ret; | |
66940653 | 775 | |
f0a523b5 SH |
776 | var->nonstd = 0; |
777 | var->activate = FB_ACTIVATE_NOW; | |
778 | var->accel_flags = 0; | |
779 | var->vmode = FB_VMODE_NONINTERLACED; | |
780 | ||
f0a523b5 | 781 | /* Memory allocation for framebuffer */ |
4aa02c7c SG |
782 | fb_size = SZ_2M; |
783 | fb_virt = alloc_pages_exact(fb_size, GFP_DMA); | |
784 | if (!fb_virt) | |
785 | return -ENOMEM; | |
f0a523b5 | 786 | |
4aa02c7c | 787 | fb_phys = virt_to_phys(fb_virt); |
f0a523b5 SH |
788 | |
789 | fb_info->fix.smem_start = fb_phys; | |
790 | fb_info->screen_base = fb_virt; | |
791 | fb_info->screen_size = fb_info->fix.smem_len = fb_size; | |
792 | ||
838bdf72 | 793 | if (mxsfb_restore_mode(host, vmode)) |
f0a523b5 SH |
794 | memset(fb_virt, 0, fb_size); |
795 | ||
796 | return 0; | |
797 | } | |
798 | ||
48c68c4f | 799 | static void mxsfb_free_videomem(struct mxsfb_info *host) |
f0a523b5 SH |
800 | { |
801 | struct fb_info *fb_info = &host->fb_info; | |
802 | ||
4aa02c7c | 803 | free_pages_exact(fb_info->screen_base, fb_info->fix.smem_len); |
f0a523b5 SH |
804 | } |
805 | ||
73fc610f SG |
806 | static struct platform_device_id mxsfb_devtype[] = { |
807 | { | |
808 | .name = "imx23-fb", | |
809 | .driver_data = MXSFB_V3, | |
810 | }, { | |
811 | .name = "imx28-fb", | |
812 | .driver_data = MXSFB_V4, | |
813 | }, { | |
814 | /* sentinel */ | |
815 | } | |
816 | }; | |
817 | MODULE_DEVICE_TABLE(platform, mxsfb_devtype); | |
818 | ||
819 | static const struct of_device_id mxsfb_dt_ids[] = { | |
820 | { .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devtype[0], }, | |
821 | { .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devtype[1], }, | |
822 | { /* sentinel */ } | |
823 | }; | |
824 | MODULE_DEVICE_TABLE(of, mxsfb_dt_ids); | |
825 | ||
48c68c4f | 826 | static int mxsfb_probe(struct platform_device *pdev) |
f0a523b5 | 827 | { |
73fc610f SG |
828 | const struct of_device_id *of_id = |
829 | of_match_device(mxsfb_dt_ids, &pdev->dev); | |
f0a523b5 SH |
830 | struct resource *res; |
831 | struct mxsfb_info *host; | |
832 | struct fb_info *fb_info; | |
838bdf72 | 833 | struct fb_videomode *mode; |
c8b5cfc8 | 834 | int ret; |
f0a523b5 | 835 | |
73fc610f SG |
836 | if (of_id) |
837 | pdev->id_entry = of_id->data; | |
838 | ||
f0a523b5 SH |
839 | fb_info = framebuffer_alloc(sizeof(struct mxsfb_info), &pdev->dev); |
840 | if (!fb_info) { | |
841 | dev_err(&pdev->dev, "Failed to allocate fbdev\n"); | |
9e548579 | 842 | return -ENOMEM; |
f0a523b5 SH |
843 | } |
844 | ||
838bdf72 LW |
845 | mode = devm_kzalloc(&pdev->dev, sizeof(struct fb_videomode), |
846 | GFP_KERNEL); | |
847 | if (mode == NULL) | |
848 | return -ENOMEM; | |
849 | ||
f0a523b5 SH |
850 | host = to_imxfb_host(fb_info); |
851 | ||
51617d1b | 852 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
9e548579 SG |
853 | host->base = devm_ioremap_resource(&pdev->dev, res); |
854 | if (IS_ERR(host->base)) { | |
9e548579 SG |
855 | ret = PTR_ERR(host->base); |
856 | goto fb_release; | |
f0a523b5 SH |
857 | } |
858 | ||
859 | host->pdev = pdev; | |
860 | platform_set_drvdata(pdev, host); | |
861 | ||
862 | host->devdata = &mxsfb_devdata[pdev->id_entry->driver_data]; | |
863 | ||
9e548579 | 864 | host->clk = devm_clk_get(&host->pdev->dev, NULL); |
f0a523b5 SH |
865 | if (IS_ERR(host->clk)) { |
866 | ret = PTR_ERR(host->clk); | |
9e548579 | 867 | goto fb_release; |
f0a523b5 SH |
868 | } |
869 | ||
4344429d FE |
870 | host->reg_lcd = devm_regulator_get(&pdev->dev, "lcd"); |
871 | if (IS_ERR(host->reg_lcd)) | |
872 | host->reg_lcd = NULL; | |
73fc610f | 873 | |
9e548579 SG |
874 | fb_info->pseudo_palette = devm_kzalloc(&pdev->dev, sizeof(u32) * 16, |
875 | GFP_KERNEL); | |
f0a523b5 SH |
876 | if (!fb_info->pseudo_palette) { |
877 | ret = -ENOMEM; | |
9e548579 | 878 | goto fb_release; |
f0a523b5 SH |
879 | } |
880 | ||
838bdf72 | 881 | ret = mxsfb_init_fbinfo(host, mode); |
f0a523b5 | 882 | if (ret != 0) |
9e548579 | 883 | goto fb_release; |
f0a523b5 | 884 | |
838bdf72 | 885 | fb_videomode_to_var(&fb_info->var, mode); |
f0a523b5 SH |
886 | |
887 | /* init the color fields */ | |
888 | mxsfb_check_var(&fb_info->var, fb_info); | |
889 | ||
890 | platform_set_drvdata(pdev, fb_info); | |
891 | ||
892 | ret = register_framebuffer(fb_info); | |
893 | if (ret != 0) { | |
894 | dev_err(&pdev->dev,"Failed to register framebuffer\n"); | |
9e548579 | 895 | goto fb_destroy; |
f0a523b5 SH |
896 | } |
897 | ||
898 | if (!host->enabled) { | |
899 | writel(0, host->base + LCDC_CTRL); | |
900 | mxsfb_set_par(fb_info); | |
901 | mxsfb_enable_controller(fb_info); | |
902 | } | |
903 | ||
904 | dev_info(&pdev->dev, "initialized\n"); | |
905 | ||
906 | return 0; | |
907 | ||
9e548579 | 908 | fb_destroy: |
f0a523b5 | 909 | if (host->enabled) |
ca4c22d3 | 910 | clk_disable_unprepare(host->clk); |
9e548579 | 911 | fb_release: |
f0a523b5 | 912 | framebuffer_release(fb_info); |
f0a523b5 SH |
913 | |
914 | return ret; | |
915 | } | |
916 | ||
48c68c4f | 917 | static int mxsfb_remove(struct platform_device *pdev) |
f0a523b5 SH |
918 | { |
919 | struct fb_info *fb_info = platform_get_drvdata(pdev); | |
920 | struct mxsfb_info *host = to_imxfb_host(fb_info); | |
f0a523b5 SH |
921 | |
922 | if (host->enabled) | |
923 | mxsfb_disable_controller(fb_info); | |
924 | ||
925 | unregister_framebuffer(fb_info); | |
f0a523b5 | 926 | mxsfb_free_videomem(host); |
f0a523b5 SH |
927 | |
928 | framebuffer_release(fb_info); | |
f0a523b5 | 929 | |
f0a523b5 SH |
930 | return 0; |
931 | } | |
932 | ||
d313a86d MV |
933 | static void mxsfb_shutdown(struct platform_device *pdev) |
934 | { | |
935 | struct fb_info *fb_info = platform_get_drvdata(pdev); | |
936 | struct mxsfb_info *host = to_imxfb_host(fb_info); | |
937 | ||
938 | /* | |
939 | * Force stop the LCD controller as keeping it running during reboot | |
940 | * might interfere with the BootROM's boot mode pads sampling. | |
941 | */ | |
942 | writel(CTRL_RUN, host->base + LCDC_CTRL + REG_CLR); | |
943 | } | |
944 | ||
f0a523b5 SH |
945 | static struct platform_driver mxsfb_driver = { |
946 | .probe = mxsfb_probe, | |
48c68c4f | 947 | .remove = mxsfb_remove, |
d313a86d | 948 | .shutdown = mxsfb_shutdown, |
f0a523b5 SH |
949 | .id_table = mxsfb_devtype, |
950 | .driver = { | |
951 | .name = DRIVER_NAME, | |
73fc610f | 952 | .of_match_table = mxsfb_dt_ids, |
f0a523b5 SH |
953 | }, |
954 | }; | |
955 | ||
396fa99e | 956 | module_platform_driver(mxsfb_driver); |
f0a523b5 SH |
957 | |
958 | MODULE_DESCRIPTION("Freescale mxs framebuffer driver"); | |
959 | MODULE_AUTHOR("Sascha Hauer, Pengutronix"); | |
960 | MODULE_LICENSE("GPL"); |