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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 SG |
44 | #include <linux/of_device.h> |
45 | #include <linux/of_gpio.h> | |
f0a523b5 SH |
46 | #include <linux/platform_device.h> |
47 | #include <linux/clk.h> | |
48 | #include <linux/dma-mapping.h> | |
49 | #include <linux/io.h> | |
fe233b9d | 50 | #include <linux/pinctrl/consumer.h> |
ce4409b5 | 51 | #include <linux/mxsfb.h> |
f0a523b5 SH |
52 | |
53 | #define REG_SET 4 | |
54 | #define REG_CLR 8 | |
55 | ||
56 | #define LCDC_CTRL 0x00 | |
57 | #define LCDC_CTRL1 0x10 | |
58 | #define LCDC_V4_CTRL2 0x20 | |
59 | #define LCDC_V3_TRANSFER_COUNT 0x20 | |
60 | #define LCDC_V4_TRANSFER_COUNT 0x30 | |
61 | #define LCDC_V4_CUR_BUF 0x40 | |
62 | #define LCDC_V4_NEXT_BUF 0x50 | |
63 | #define LCDC_V3_CUR_BUF 0x30 | |
64 | #define LCDC_V3_NEXT_BUF 0x40 | |
65 | #define LCDC_TIMING 0x60 | |
66 | #define LCDC_VDCTRL0 0x70 | |
67 | #define LCDC_VDCTRL1 0x80 | |
68 | #define LCDC_VDCTRL2 0x90 | |
69 | #define LCDC_VDCTRL3 0xa0 | |
70 | #define LCDC_VDCTRL4 0xb0 | |
71 | #define LCDC_DVICTRL0 0xc0 | |
72 | #define LCDC_DVICTRL1 0xd0 | |
73 | #define LCDC_DVICTRL2 0xe0 | |
74 | #define LCDC_DVICTRL3 0xf0 | |
75 | #define LCDC_DVICTRL4 0x100 | |
76 | #define LCDC_V4_DATA 0x180 | |
77 | #define LCDC_V3_DATA 0x1b0 | |
78 | #define LCDC_V4_DEBUG0 0x1d0 | |
79 | #define LCDC_V3_DEBUG0 0x1f0 | |
80 | ||
81 | #define CTRL_SFTRST (1 << 31) | |
82 | #define CTRL_CLKGATE (1 << 30) | |
83 | #define CTRL_BYPASS_COUNT (1 << 19) | |
84 | #define CTRL_VSYNC_MODE (1 << 18) | |
85 | #define CTRL_DOTCLK_MODE (1 << 17) | |
86 | #define CTRL_DATA_SELECT (1 << 16) | |
87 | #define CTRL_SET_BUS_WIDTH(x) (((x) & 0x3) << 10) | |
88 | #define CTRL_GET_BUS_WIDTH(x) (((x) >> 10) & 0x3) | |
89 | #define CTRL_SET_WORD_LENGTH(x) (((x) & 0x3) << 8) | |
90 | #define CTRL_GET_WORD_LENGTH(x) (((x) >> 8) & 0x3) | |
91 | #define CTRL_MASTER (1 << 5) | |
92 | #define CTRL_DF16 (1 << 3) | |
93 | #define CTRL_DF18 (1 << 2) | |
94 | #define CTRL_DF24 (1 << 1) | |
95 | #define CTRL_RUN (1 << 0) | |
96 | ||
97 | #define CTRL1_FIFO_CLEAR (1 << 21) | |
98 | #define CTRL1_SET_BYTE_PACKAGING(x) (((x) & 0xf) << 16) | |
99 | #define CTRL1_GET_BYTE_PACKAGING(x) (((x) >> 16) & 0xf) | |
100 | ||
101 | #define TRANSFER_COUNT_SET_VCOUNT(x) (((x) & 0xffff) << 16) | |
102 | #define TRANSFER_COUNT_GET_VCOUNT(x) (((x) >> 16) & 0xffff) | |
103 | #define TRANSFER_COUNT_SET_HCOUNT(x) ((x) & 0xffff) | |
104 | #define TRANSFER_COUNT_GET_HCOUNT(x) ((x) & 0xffff) | |
105 | ||
106 | ||
107 | #define VDCTRL0_ENABLE_PRESENT (1 << 28) | |
108 | #define VDCTRL0_VSYNC_ACT_HIGH (1 << 27) | |
109 | #define VDCTRL0_HSYNC_ACT_HIGH (1 << 26) | |
110 | #define VDCTRL0_DOTCLK_ACT_FAILING (1 << 25) | |
111 | #define VDCTRL0_ENABLE_ACT_HIGH (1 << 24) | |
112 | #define VDCTRL0_VSYNC_PERIOD_UNIT (1 << 21) | |
113 | #define VDCTRL0_VSYNC_PULSE_WIDTH_UNIT (1 << 20) | |
114 | #define VDCTRL0_HALF_LINE (1 << 19) | |
115 | #define VDCTRL0_HALF_LINE_MODE (1 << 18) | |
116 | #define VDCTRL0_SET_VSYNC_PULSE_WIDTH(x) ((x) & 0x3ffff) | |
117 | #define VDCTRL0_GET_VSYNC_PULSE_WIDTH(x) ((x) & 0x3ffff) | |
118 | ||
119 | #define VDCTRL2_SET_HSYNC_PERIOD(x) ((x) & 0x3ffff) | |
120 | #define VDCTRL2_GET_HSYNC_PERIOD(x) ((x) & 0x3ffff) | |
121 | ||
122 | #define VDCTRL3_MUX_SYNC_SIGNALS (1 << 29) | |
123 | #define VDCTRL3_VSYNC_ONLY (1 << 28) | |
124 | #define SET_HOR_WAIT_CNT(x) (((x) & 0xfff) << 16) | |
125 | #define GET_HOR_WAIT_CNT(x) (((x) >> 16) & 0xfff) | |
126 | #define SET_VERT_WAIT_CNT(x) ((x) & 0xffff) | |
127 | #define GET_VERT_WAIT_CNT(x) ((x) & 0xffff) | |
128 | ||
129 | #define VDCTRL4_SET_DOTCLK_DLY(x) (((x) & 0x7) << 29) /* v4 only */ | |
130 | #define VDCTRL4_GET_DOTCLK_DLY(x) (((x) >> 29) & 0x7) /* v4 only */ | |
131 | #define VDCTRL4_SYNC_SIGNALS_ON (1 << 18) | |
132 | #define SET_DOTCLK_H_VALID_DATA_CNT(x) ((x) & 0x3ffff) | |
133 | ||
134 | #define DEBUG0_HSYNC (1 < 26) | |
135 | #define DEBUG0_VSYNC (1 < 25) | |
136 | ||
137 | #define MIN_XRES 120 | |
138 | #define MIN_YRES 120 | |
139 | ||
140 | #define RED 0 | |
141 | #define GREEN 1 | |
142 | #define BLUE 2 | |
143 | #define TRANSP 3 | |
144 | ||
145 | enum mxsfb_devtype { | |
146 | MXSFB_V3, | |
147 | MXSFB_V4, | |
148 | }; | |
149 | ||
150 | /* CPU dependent register offsets */ | |
151 | struct mxsfb_devdata { | |
152 | unsigned transfer_count; | |
153 | unsigned cur_buf; | |
154 | unsigned next_buf; | |
155 | unsigned debug0; | |
156 | unsigned hs_wdth_mask; | |
157 | unsigned hs_wdth_shift; | |
158 | unsigned ipversion; | |
159 | }; | |
160 | ||
161 | struct mxsfb_info { | |
162 | struct fb_info fb_info; | |
163 | struct platform_device *pdev; | |
164 | struct clk *clk; | |
165 | void __iomem *base; /* registers */ | |
166 | unsigned allocated_size; | |
167 | int enabled; | |
168 | unsigned ld_intf_width; | |
169 | unsigned dotclk_delay; | |
170 | const struct mxsfb_devdata *devdata; | |
171 | int mapped; | |
172 | }; | |
173 | ||
174 | #define mxsfb_is_v3(host) (host->devdata->ipversion == 3) | |
175 | #define mxsfb_is_v4(host) (host->devdata->ipversion == 4) | |
176 | ||
177 | static const struct mxsfb_devdata mxsfb_devdata[] = { | |
178 | [MXSFB_V3] = { | |
179 | .transfer_count = LCDC_V3_TRANSFER_COUNT, | |
180 | .cur_buf = LCDC_V3_CUR_BUF, | |
181 | .next_buf = LCDC_V3_NEXT_BUF, | |
182 | .debug0 = LCDC_V3_DEBUG0, | |
183 | .hs_wdth_mask = 0xff, | |
184 | .hs_wdth_shift = 24, | |
185 | .ipversion = 3, | |
186 | }, | |
187 | [MXSFB_V4] = { | |
188 | .transfer_count = LCDC_V4_TRANSFER_COUNT, | |
189 | .cur_buf = LCDC_V4_CUR_BUF, | |
190 | .next_buf = LCDC_V4_NEXT_BUF, | |
191 | .debug0 = LCDC_V4_DEBUG0, | |
192 | .hs_wdth_mask = 0x3fff, | |
193 | .hs_wdth_shift = 18, | |
194 | .ipversion = 4, | |
195 | }, | |
196 | }; | |
197 | ||
198 | #define to_imxfb_host(x) (container_of(x, struct mxsfb_info, fb_info)) | |
199 | ||
200 | /* mask and shift depends on architecture */ | |
201 | static inline u32 set_hsync_pulse_width(struct mxsfb_info *host, unsigned val) | |
202 | { | |
203 | return (val & host->devdata->hs_wdth_mask) << | |
204 | host->devdata->hs_wdth_shift; | |
205 | } | |
206 | ||
207 | static inline u32 get_hsync_pulse_width(struct mxsfb_info *host, unsigned val) | |
208 | { | |
209 | return (val >> host->devdata->hs_wdth_shift) & | |
210 | host->devdata->hs_wdth_mask; | |
211 | } | |
212 | ||
213 | static const struct fb_bitfield def_rgb565[] = { | |
214 | [RED] = { | |
215 | .offset = 11, | |
216 | .length = 5, | |
217 | }, | |
218 | [GREEN] = { | |
219 | .offset = 5, | |
220 | .length = 6, | |
221 | }, | |
222 | [BLUE] = { | |
223 | .offset = 0, | |
224 | .length = 5, | |
225 | }, | |
226 | [TRANSP] = { /* no support for transparency */ | |
227 | .length = 0, | |
228 | } | |
229 | }; | |
230 | ||
231 | static const struct fb_bitfield def_rgb666[] = { | |
232 | [RED] = { | |
233 | .offset = 16, | |
234 | .length = 6, | |
235 | }, | |
236 | [GREEN] = { | |
237 | .offset = 8, | |
238 | .length = 6, | |
239 | }, | |
240 | [BLUE] = { | |
241 | .offset = 0, | |
242 | .length = 6, | |
243 | }, | |
244 | [TRANSP] = { /* no support for transparency */ | |
245 | .length = 0, | |
246 | } | |
247 | }; | |
248 | ||
249 | static const struct fb_bitfield def_rgb888[] = { | |
250 | [RED] = { | |
251 | .offset = 16, | |
252 | .length = 8, | |
253 | }, | |
254 | [GREEN] = { | |
255 | .offset = 8, | |
256 | .length = 8, | |
257 | }, | |
258 | [BLUE] = { | |
259 | .offset = 0, | |
260 | .length = 8, | |
261 | }, | |
262 | [TRANSP] = { /* no support for transparency */ | |
263 | .length = 0, | |
264 | } | |
265 | }; | |
266 | ||
267 | static inline unsigned chan_to_field(unsigned chan, struct fb_bitfield *bf) | |
268 | { | |
269 | chan &= 0xffff; | |
270 | chan >>= 16 - bf->length; | |
271 | return chan << bf->offset; | |
272 | } | |
273 | ||
274 | static int mxsfb_check_var(struct fb_var_screeninfo *var, | |
275 | struct fb_info *fb_info) | |
276 | { | |
277 | struct mxsfb_info *host = to_imxfb_host(fb_info); | |
278 | const struct fb_bitfield *rgb = NULL; | |
279 | ||
280 | if (var->xres < MIN_XRES) | |
281 | var->xres = MIN_XRES; | |
282 | if (var->yres < MIN_YRES) | |
283 | var->yres = MIN_YRES; | |
284 | ||
285 | var->xres_virtual = var->xres; | |
286 | ||
287 | var->yres_virtual = var->yres; | |
288 | ||
289 | switch (var->bits_per_pixel) { | |
290 | case 16: | |
291 | /* always expect RGB 565 */ | |
292 | rgb = def_rgb565; | |
293 | break; | |
294 | case 32: | |
295 | switch (host->ld_intf_width) { | |
296 | case STMLCDIF_8BIT: | |
297 | pr_debug("Unsupported LCD bus width mapping\n"); | |
298 | break; | |
299 | case STMLCDIF_16BIT: | |
300 | case STMLCDIF_18BIT: | |
301 | /* 24 bit to 18 bit mapping */ | |
302 | rgb = def_rgb666; | |
303 | break; | |
304 | case STMLCDIF_24BIT: | |
305 | /* real 24 bit */ | |
306 | rgb = def_rgb888; | |
307 | break; | |
308 | } | |
309 | break; | |
310 | default: | |
311 | pr_debug("Unsupported colour depth: %u\n", var->bits_per_pixel); | |
312 | return -EINVAL; | |
313 | } | |
314 | ||
315 | /* | |
316 | * Copy the RGB parameters for this display | |
317 | * from the machine specific parameters. | |
318 | */ | |
319 | var->red = rgb[RED]; | |
320 | var->green = rgb[GREEN]; | |
321 | var->blue = rgb[BLUE]; | |
322 | var->transp = rgb[TRANSP]; | |
323 | ||
324 | return 0; | |
325 | } | |
326 | ||
327 | static void mxsfb_enable_controller(struct fb_info *fb_info) | |
328 | { | |
329 | struct mxsfb_info *host = to_imxfb_host(fb_info); | |
330 | u32 reg; | |
331 | ||
332 | dev_dbg(&host->pdev->dev, "%s\n", __func__); | |
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; | |
355 | ||
356 | dev_dbg(&host->pdev->dev, "%s\n", __func__); | |
357 | ||
358 | /* | |
359 | * Even if we disable the controller here, it will still continue | |
360 | * until its FIFOs are running out of data | |
361 | */ | |
362 | writel(CTRL_DOTCLK_MODE, host->base + LCDC_CTRL + REG_CLR); | |
363 | ||
364 | loop = 1000; | |
365 | while (loop) { | |
366 | reg = readl(host->base + LCDC_CTRL); | |
367 | if (!(reg & CTRL_RUN)) | |
368 | break; | |
369 | loop--; | |
370 | } | |
371 | ||
372 | writel(VDCTRL4_SYNC_SIGNALS_ON, host->base + LCDC_VDCTRL4 + REG_CLR); | |
373 | ||
ca4c22d3 | 374 | clk_disable_unprepare(host->clk); |
f0a523b5 SH |
375 | |
376 | host->enabled = 0; | |
377 | } | |
378 | ||
379 | static int mxsfb_set_par(struct fb_info *fb_info) | |
380 | { | |
381 | struct mxsfb_info *host = to_imxfb_host(fb_info); | |
382 | u32 ctrl, vdctrl0, vdctrl4; | |
383 | int line_size, fb_size; | |
384 | int reenable = 0; | |
385 | ||
386 | line_size = fb_info->var.xres * (fb_info->var.bits_per_pixel >> 3); | |
387 | fb_size = fb_info->var.yres_virtual * line_size; | |
388 | ||
389 | if (fb_size > fb_info->fix.smem_len) | |
390 | return -ENOMEM; | |
391 | ||
392 | fb_info->fix.line_length = line_size; | |
393 | ||
394 | /* | |
395 | * It seems, you can't re-program the controller if it is still running. | |
396 | * This may lead into shifted pictures (FIFO issue?). | |
397 | * So, first stop the controller and drain its FIFOs | |
398 | */ | |
399 | if (host->enabled) { | |
400 | reenable = 1; | |
401 | mxsfb_disable_controller(fb_info); | |
402 | } | |
403 | ||
404 | /* clear the FIFOs */ | |
405 | writel(CTRL1_FIFO_CLEAR, host->base + LCDC_CTRL1 + REG_SET); | |
406 | ||
407 | ctrl = CTRL_BYPASS_COUNT | CTRL_MASTER | | |
6eab04a8 | 408 | CTRL_SET_BUS_WIDTH(host->ld_intf_width); |
f0a523b5 SH |
409 | |
410 | switch (fb_info->var.bits_per_pixel) { | |
411 | case 16: | |
412 | dev_dbg(&host->pdev->dev, "Setting up RGB565 mode\n"); | |
413 | ctrl |= CTRL_SET_WORD_LENGTH(0); | |
414 | writel(CTRL1_SET_BYTE_PACKAGING(0xf), host->base + LCDC_CTRL1); | |
415 | break; | |
416 | case 32: | |
417 | dev_dbg(&host->pdev->dev, "Setting up RGB888/666 mode\n"); | |
418 | ctrl |= CTRL_SET_WORD_LENGTH(3); | |
419 | switch (host->ld_intf_width) { | |
420 | case STMLCDIF_8BIT: | |
421 | dev_dbg(&host->pdev->dev, | |
422 | "Unsupported LCD bus width mapping\n"); | |
423 | return -EINVAL; | |
424 | case STMLCDIF_16BIT: | |
425 | case STMLCDIF_18BIT: | |
426 | /* 24 bit to 18 bit mapping */ | |
427 | ctrl |= CTRL_DF24; /* ignore the upper 2 bits in | |
428 | * each colour component | |
429 | */ | |
430 | break; | |
431 | case STMLCDIF_24BIT: | |
432 | /* real 24 bit */ | |
433 | break; | |
434 | } | |
435 | /* do not use packed pixels = one pixel per word instead */ | |
436 | writel(CTRL1_SET_BYTE_PACKAGING(0x7), host->base + LCDC_CTRL1); | |
437 | break; | |
438 | default: | |
439 | dev_dbg(&host->pdev->dev, "Unhandled color depth of %u\n", | |
440 | fb_info->var.bits_per_pixel); | |
441 | return -EINVAL; | |
442 | } | |
443 | ||
444 | writel(ctrl, host->base + LCDC_CTRL); | |
445 | ||
446 | writel(TRANSFER_COUNT_SET_VCOUNT(fb_info->var.yres) | | |
447 | TRANSFER_COUNT_SET_HCOUNT(fb_info->var.xres), | |
448 | host->base + host->devdata->transfer_count); | |
449 | ||
450 | vdctrl0 = VDCTRL0_ENABLE_PRESENT | /* always in DOTCLOCK mode */ | |
451 | VDCTRL0_VSYNC_PERIOD_UNIT | | |
452 | VDCTRL0_VSYNC_PULSE_WIDTH_UNIT | | |
453 | VDCTRL0_SET_VSYNC_PULSE_WIDTH(fb_info->var.vsync_len); | |
454 | if (fb_info->var.sync & FB_SYNC_HOR_HIGH_ACT) | |
455 | vdctrl0 |= VDCTRL0_HSYNC_ACT_HIGH; | |
456 | if (fb_info->var.sync & FB_SYNC_VERT_HIGH_ACT) | |
457 | vdctrl0 |= VDCTRL0_VSYNC_ACT_HIGH; | |
458 | if (fb_info->var.sync & FB_SYNC_DATA_ENABLE_HIGH_ACT) | |
459 | vdctrl0 |= VDCTRL0_ENABLE_ACT_HIGH; | |
460 | if (fb_info->var.sync & FB_SYNC_DOTCLK_FAILING_ACT) | |
461 | vdctrl0 |= VDCTRL0_DOTCLK_ACT_FAILING; | |
462 | ||
463 | writel(vdctrl0, host->base + LCDC_VDCTRL0); | |
464 | ||
465 | /* frame length in lines */ | |
466 | writel(fb_info->var.upper_margin + fb_info->var.vsync_len + | |
467 | fb_info->var.lower_margin + fb_info->var.yres, | |
468 | host->base + LCDC_VDCTRL1); | |
469 | ||
470 | /* line length in units of clocks or pixels */ | |
471 | writel(set_hsync_pulse_width(host, fb_info->var.hsync_len) | | |
472 | VDCTRL2_SET_HSYNC_PERIOD(fb_info->var.left_margin + | |
473 | fb_info->var.hsync_len + fb_info->var.right_margin + | |
474 | fb_info->var.xres), | |
475 | host->base + LCDC_VDCTRL2); | |
476 | ||
477 | writel(SET_HOR_WAIT_CNT(fb_info->var.left_margin + | |
478 | fb_info->var.hsync_len) | | |
479 | SET_VERT_WAIT_CNT(fb_info->var.upper_margin + | |
480 | fb_info->var.vsync_len), | |
481 | host->base + LCDC_VDCTRL3); | |
482 | ||
483 | vdctrl4 = SET_DOTCLK_H_VALID_DATA_CNT(fb_info->var.xres); | |
484 | if (mxsfb_is_v4(host)) | |
485 | vdctrl4 |= VDCTRL4_SET_DOTCLK_DLY(host->dotclk_delay); | |
486 | writel(vdctrl4, host->base + LCDC_VDCTRL4); | |
487 | ||
488 | writel(fb_info->fix.smem_start + | |
489 | fb_info->fix.line_length * fb_info->var.yoffset, | |
490 | host->base + host->devdata->next_buf); | |
491 | ||
492 | if (reenable) | |
493 | mxsfb_enable_controller(fb_info); | |
494 | ||
495 | return 0; | |
496 | } | |
497 | ||
498 | static int mxsfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, | |
499 | u_int transp, struct fb_info *fb_info) | |
500 | { | |
501 | unsigned int val; | |
502 | int ret = -EINVAL; | |
503 | ||
504 | /* | |
505 | * If greyscale is true, then we convert the RGB value | |
506 | * to greyscale no matter what visual we are using. | |
507 | */ | |
508 | if (fb_info->var.grayscale) | |
509 | red = green = blue = (19595 * red + 38470 * green + | |
510 | 7471 * blue) >> 16; | |
511 | ||
512 | switch (fb_info->fix.visual) { | |
513 | case FB_VISUAL_TRUECOLOR: | |
514 | /* | |
515 | * 12 or 16-bit True Colour. We encode the RGB value | |
516 | * according to the RGB bitfield information. | |
517 | */ | |
518 | if (regno < 16) { | |
519 | u32 *pal = fb_info->pseudo_palette; | |
520 | ||
521 | val = chan_to_field(red, &fb_info->var.red); | |
522 | val |= chan_to_field(green, &fb_info->var.green); | |
523 | val |= chan_to_field(blue, &fb_info->var.blue); | |
524 | ||
525 | pal[regno] = val; | |
526 | ret = 0; | |
527 | } | |
528 | break; | |
529 | ||
530 | case FB_VISUAL_STATIC_PSEUDOCOLOR: | |
531 | case FB_VISUAL_PSEUDOCOLOR: | |
532 | break; | |
533 | } | |
534 | ||
535 | return ret; | |
536 | } | |
537 | ||
538 | static int mxsfb_blank(int blank, struct fb_info *fb_info) | |
539 | { | |
540 | struct mxsfb_info *host = to_imxfb_host(fb_info); | |
541 | ||
542 | switch (blank) { | |
543 | case FB_BLANK_POWERDOWN: | |
544 | case FB_BLANK_VSYNC_SUSPEND: | |
545 | case FB_BLANK_HSYNC_SUSPEND: | |
546 | case FB_BLANK_NORMAL: | |
547 | if (host->enabled) | |
548 | mxsfb_disable_controller(fb_info); | |
549 | break; | |
550 | ||
551 | case FB_BLANK_UNBLANK: | |
552 | if (!host->enabled) | |
553 | mxsfb_enable_controller(fb_info); | |
554 | break; | |
555 | } | |
556 | return 0; | |
557 | } | |
558 | ||
559 | static int mxsfb_pan_display(struct fb_var_screeninfo *var, | |
560 | struct fb_info *fb_info) | |
561 | { | |
562 | struct mxsfb_info *host = to_imxfb_host(fb_info); | |
563 | unsigned offset; | |
564 | ||
565 | if (var->xoffset != 0) | |
566 | return -EINVAL; | |
567 | ||
568 | offset = fb_info->fix.line_length * var->yoffset; | |
569 | ||
570 | /* update on next VSYNC */ | |
571 | writel(fb_info->fix.smem_start + offset, | |
572 | host->base + host->devdata->next_buf); | |
573 | ||
574 | return 0; | |
575 | } | |
576 | ||
577 | static struct fb_ops mxsfb_ops = { | |
578 | .owner = THIS_MODULE, | |
579 | .fb_check_var = mxsfb_check_var, | |
580 | .fb_set_par = mxsfb_set_par, | |
581 | .fb_setcolreg = mxsfb_setcolreg, | |
582 | .fb_blank = mxsfb_blank, | |
583 | .fb_pan_display = mxsfb_pan_display, | |
584 | .fb_fillrect = cfb_fillrect, | |
585 | .fb_copyarea = cfb_copyarea, | |
586 | .fb_imageblit = cfb_imageblit, | |
587 | }; | |
588 | ||
589 | static int __devinit mxsfb_restore_mode(struct mxsfb_info *host) | |
590 | { | |
591 | struct fb_info *fb_info = &host->fb_info; | |
592 | unsigned line_count; | |
593 | unsigned period; | |
594 | unsigned long pa, fbsize; | |
595 | int bits_per_pixel, ofs; | |
596 | u32 transfer_count, vdctrl0, vdctrl2, vdctrl3, vdctrl4, ctrl; | |
597 | struct fb_videomode vmode; | |
598 | ||
599 | /* Only restore the mode when the controller is running */ | |
600 | ctrl = readl(host->base + LCDC_CTRL); | |
601 | if (!(ctrl & CTRL_RUN)) | |
602 | return -EINVAL; | |
603 | ||
604 | vdctrl0 = readl(host->base + LCDC_VDCTRL0); | |
605 | vdctrl2 = readl(host->base + LCDC_VDCTRL2); | |
606 | vdctrl3 = readl(host->base + LCDC_VDCTRL3); | |
607 | vdctrl4 = readl(host->base + LCDC_VDCTRL4); | |
608 | ||
609 | transfer_count = readl(host->base + host->devdata->transfer_count); | |
610 | ||
611 | vmode.xres = TRANSFER_COUNT_GET_HCOUNT(transfer_count); | |
612 | vmode.yres = TRANSFER_COUNT_GET_VCOUNT(transfer_count); | |
613 | ||
614 | switch (CTRL_GET_WORD_LENGTH(ctrl)) { | |
615 | case 0: | |
616 | bits_per_pixel = 16; | |
617 | break; | |
618 | case 3: | |
619 | bits_per_pixel = 32; | |
620 | case 1: | |
621 | default: | |
622 | return -EINVAL; | |
623 | } | |
624 | ||
625 | fb_info->var.bits_per_pixel = bits_per_pixel; | |
626 | ||
627 | vmode.pixclock = KHZ2PICOS(clk_get_rate(host->clk) / 1000U); | |
628 | vmode.hsync_len = get_hsync_pulse_width(host, vdctrl2); | |
629 | vmode.left_margin = GET_HOR_WAIT_CNT(vdctrl3) - vmode.hsync_len; | |
630 | vmode.right_margin = VDCTRL2_GET_HSYNC_PERIOD(vdctrl2) - vmode.hsync_len - | |
631 | vmode.left_margin - vmode.xres; | |
632 | vmode.vsync_len = VDCTRL0_GET_VSYNC_PULSE_WIDTH(vdctrl0); | |
633 | period = readl(host->base + LCDC_VDCTRL1); | |
634 | vmode.upper_margin = GET_VERT_WAIT_CNT(vdctrl3) - vmode.vsync_len; | |
635 | vmode.lower_margin = period - vmode.vsync_len - vmode.upper_margin - vmode.yres; | |
636 | ||
637 | vmode.vmode = FB_VMODE_NONINTERLACED; | |
638 | ||
639 | vmode.sync = 0; | |
640 | if (vdctrl0 & VDCTRL0_HSYNC_ACT_HIGH) | |
641 | vmode.sync |= FB_SYNC_HOR_HIGH_ACT; | |
642 | if (vdctrl0 & VDCTRL0_VSYNC_ACT_HIGH) | |
643 | vmode.sync |= FB_SYNC_VERT_HIGH_ACT; | |
644 | ||
645 | pr_debug("Reconstructed video mode:\n"); | |
646 | pr_debug("%dx%d, hsync: %u left: %u, right: %u, vsync: %u, upper: %u, lower: %u\n", | |
647 | vmode.xres, vmode.yres, | |
648 | vmode.hsync_len, vmode.left_margin, vmode.right_margin, | |
649 | vmode.vsync_len, vmode.upper_margin, vmode.lower_margin); | |
650 | pr_debug("pixclk: %ldkHz\n", PICOS2KHZ(vmode.pixclock)); | |
651 | ||
652 | fb_add_videomode(&vmode, &fb_info->modelist); | |
653 | ||
654 | host->ld_intf_width = CTRL_GET_BUS_WIDTH(ctrl); | |
655 | host->dotclk_delay = VDCTRL4_GET_DOTCLK_DLY(vdctrl4); | |
656 | ||
657 | fb_info->fix.line_length = vmode.xres * (bits_per_pixel >> 3); | |
658 | ||
659 | pa = readl(host->base + host->devdata->cur_buf); | |
660 | fbsize = fb_info->fix.line_length * vmode.yres; | |
661 | if (pa < fb_info->fix.smem_start) | |
662 | return -EINVAL; | |
663 | if (pa + fbsize > fb_info->fix.smem_start + fb_info->fix.smem_len) | |
664 | return -EINVAL; | |
665 | ofs = pa - fb_info->fix.smem_start; | |
666 | if (ofs) { | |
667 | memmove(fb_info->screen_base, fb_info->screen_base + ofs, fbsize); | |
668 | writel(fb_info->fix.smem_start, host->base + host->devdata->next_buf); | |
669 | } | |
670 | ||
671 | line_count = fb_info->fix.smem_len / fb_info->fix.line_length; | |
672 | fb_info->fix.ypanstep = 1; | |
673 | ||
ca4c22d3 | 674 | clk_prepare_enable(host->clk); |
f0a523b5 SH |
675 | host->enabled = 1; |
676 | ||
677 | return 0; | |
678 | } | |
679 | ||
680 | static int __devinit mxsfb_init_fbinfo(struct mxsfb_info *host) | |
681 | { | |
682 | struct fb_info *fb_info = &host->fb_info; | |
683 | struct fb_var_screeninfo *var = &fb_info->var; | |
684 | struct mxsfb_platform_data *pdata = host->pdev->dev.platform_data; | |
685 | dma_addr_t fb_phys; | |
686 | void *fb_virt; | |
687 | unsigned fb_size = pdata->fb_size; | |
688 | ||
689 | fb_info->fbops = &mxsfb_ops; | |
690 | fb_info->flags = FBINFO_FLAG_DEFAULT | FBINFO_READS_FAST; | |
691 | strlcpy(fb_info->fix.id, "mxs", sizeof(fb_info->fix.id)); | |
692 | fb_info->fix.type = FB_TYPE_PACKED_PIXELS; | |
693 | fb_info->fix.ypanstep = 1; | |
694 | fb_info->fix.visual = FB_VISUAL_TRUECOLOR, | |
695 | fb_info->fix.accel = FB_ACCEL_NONE; | |
696 | ||
697 | var->bits_per_pixel = pdata->default_bpp ? pdata->default_bpp : 16; | |
698 | var->nonstd = 0; | |
699 | var->activate = FB_ACTIVATE_NOW; | |
700 | var->accel_flags = 0; | |
701 | var->vmode = FB_VMODE_NONINTERLACED; | |
702 | ||
703 | host->dotclk_delay = pdata->dotclk_delay; | |
704 | host->ld_intf_width = pdata->ld_intf_width; | |
705 | ||
706 | /* Memory allocation for framebuffer */ | |
707 | if (pdata->fb_phys) { | |
708 | if (!fb_size) | |
709 | return -EINVAL; | |
710 | ||
711 | fb_phys = pdata->fb_phys; | |
712 | ||
713 | if (!request_mem_region(fb_phys, fb_size, host->pdev->name)) | |
714 | return -ENOMEM; | |
715 | ||
716 | fb_virt = ioremap(fb_phys, fb_size); | |
717 | if (!fb_virt) { | |
718 | release_mem_region(fb_phys, fb_size); | |
719 | return -ENOMEM; | |
720 | } | |
721 | host->mapped = 1; | |
722 | } else { | |
723 | if (!fb_size) | |
724 | fb_size = SZ_2M; /* default */ | |
725 | fb_virt = alloc_pages_exact(fb_size, GFP_DMA); | |
726 | if (!fb_virt) | |
727 | return -ENOMEM; | |
728 | ||
729 | fb_phys = virt_to_phys(fb_virt); | |
730 | } | |
731 | ||
732 | fb_info->fix.smem_start = fb_phys; | |
733 | fb_info->screen_base = fb_virt; | |
734 | fb_info->screen_size = fb_info->fix.smem_len = fb_size; | |
735 | ||
736 | if (mxsfb_restore_mode(host)) | |
737 | memset(fb_virt, 0, fb_size); | |
738 | ||
739 | return 0; | |
740 | } | |
741 | ||
742 | static void __devexit mxsfb_free_videomem(struct mxsfb_info *host) | |
743 | { | |
744 | struct fb_info *fb_info = &host->fb_info; | |
745 | ||
746 | if (host->mapped) { | |
747 | iounmap(fb_info->screen_base); | |
748 | release_mem_region(fb_info->fix.smem_start, | |
749 | fb_info->screen_size); | |
750 | } else { | |
751 | free_pages_exact(fb_info->screen_base, fb_info->fix.smem_len); | |
752 | } | |
753 | } | |
754 | ||
73fc610f SG |
755 | static struct platform_device_id mxsfb_devtype[] = { |
756 | { | |
757 | .name = "imx23-fb", | |
758 | .driver_data = MXSFB_V3, | |
759 | }, { | |
760 | .name = "imx28-fb", | |
761 | .driver_data = MXSFB_V4, | |
762 | }, { | |
763 | /* sentinel */ | |
764 | } | |
765 | }; | |
766 | MODULE_DEVICE_TABLE(platform, mxsfb_devtype); | |
767 | ||
768 | static const struct of_device_id mxsfb_dt_ids[] = { | |
769 | { .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devtype[0], }, | |
770 | { .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devtype[1], }, | |
771 | { /* sentinel */ } | |
772 | }; | |
773 | MODULE_DEVICE_TABLE(of, mxsfb_dt_ids); | |
774 | ||
f0a523b5 SH |
775 | static int __devinit mxsfb_probe(struct platform_device *pdev) |
776 | { | |
73fc610f SG |
777 | const struct of_device_id *of_id = |
778 | of_match_device(mxsfb_dt_ids, &pdev->dev); | |
f0a523b5 SH |
779 | struct mxsfb_platform_data *pdata = pdev->dev.platform_data; |
780 | struct resource *res; | |
781 | struct mxsfb_info *host; | |
782 | struct fb_info *fb_info; | |
783 | struct fb_modelist *modelist; | |
fe233b9d | 784 | struct pinctrl *pinctrl; |
73fc610f SG |
785 | int panel_enable; |
786 | enum of_gpio_flags flags; | |
f0a523b5 SH |
787 | int i, ret; |
788 | ||
73fc610f SG |
789 | if (of_id) |
790 | pdev->id_entry = of_id->data; | |
791 | ||
f0a523b5 SH |
792 | if (!pdata) { |
793 | dev_err(&pdev->dev, "No platformdata. Giving up\n"); | |
794 | return -ENODEV; | |
795 | } | |
796 | ||
797 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
798 | if (!res) { | |
799 | dev_err(&pdev->dev, "Cannot get memory IO resource\n"); | |
800 | return -ENODEV; | |
801 | } | |
802 | ||
803 | if (!request_mem_region(res->start, resource_size(res), pdev->name)) | |
804 | return -EBUSY; | |
805 | ||
806 | fb_info = framebuffer_alloc(sizeof(struct mxsfb_info), &pdev->dev); | |
807 | if (!fb_info) { | |
808 | dev_err(&pdev->dev, "Failed to allocate fbdev\n"); | |
809 | ret = -ENOMEM; | |
810 | goto error_alloc_info; | |
811 | } | |
812 | ||
813 | host = to_imxfb_host(fb_info); | |
814 | ||
815 | host->base = ioremap(res->start, resource_size(res)); | |
816 | if (!host->base) { | |
817 | dev_err(&pdev->dev, "ioremap failed\n"); | |
818 | ret = -ENOMEM; | |
819 | goto error_ioremap; | |
820 | } | |
821 | ||
822 | host->pdev = pdev; | |
823 | platform_set_drvdata(pdev, host); | |
824 | ||
825 | host->devdata = &mxsfb_devdata[pdev->id_entry->driver_data]; | |
826 | ||
fe233b9d SG |
827 | pinctrl = devm_pinctrl_get_select_default(&pdev->dev); |
828 | if (IS_ERR(pinctrl)) { | |
829 | ret = PTR_ERR(pinctrl); | |
830 | goto error_getpin; | |
831 | } | |
832 | ||
f0a523b5 SH |
833 | host->clk = clk_get(&host->pdev->dev, NULL); |
834 | if (IS_ERR(host->clk)) { | |
835 | ret = PTR_ERR(host->clk); | |
836 | goto error_getclock; | |
837 | } | |
838 | ||
73fc610f SG |
839 | panel_enable = of_get_named_gpio_flags(pdev->dev.of_node, |
840 | "panel-enable-gpios", 0, &flags); | |
841 | if (gpio_is_valid(panel_enable)) { | |
842 | unsigned long f = GPIOF_OUT_INIT_HIGH; | |
843 | if (flags == OF_GPIO_ACTIVE_LOW) | |
844 | f = GPIOF_OUT_INIT_LOW; | |
845 | ret = devm_gpio_request_one(&pdev->dev, panel_enable, | |
846 | f, "panel-enable"); | |
847 | if (ret) { | |
848 | dev_err(&pdev->dev, | |
849 | "failed to request gpio %d: %d\n", | |
850 | panel_enable, ret); | |
851 | goto error_panel_enable; | |
852 | } | |
853 | } | |
854 | ||
f0a523b5 SH |
855 | fb_info->pseudo_palette = kmalloc(sizeof(u32) * 16, GFP_KERNEL); |
856 | if (!fb_info->pseudo_palette) { | |
857 | ret = -ENOMEM; | |
858 | goto error_pseudo_pallette; | |
859 | } | |
860 | ||
861 | INIT_LIST_HEAD(&fb_info->modelist); | |
862 | ||
863 | ret = mxsfb_init_fbinfo(host); | |
864 | if (ret != 0) | |
865 | goto error_init_fb; | |
866 | ||
867 | for (i = 0; i < pdata->mode_count; i++) | |
868 | fb_add_videomode(&pdata->mode_list[i], &fb_info->modelist); | |
869 | ||
870 | modelist = list_first_entry(&fb_info->modelist, | |
871 | struct fb_modelist, list); | |
872 | fb_videomode_to_var(&fb_info->var, &modelist->mode); | |
873 | ||
874 | /* init the color fields */ | |
875 | mxsfb_check_var(&fb_info->var, fb_info); | |
876 | ||
877 | platform_set_drvdata(pdev, fb_info); | |
878 | ||
879 | ret = register_framebuffer(fb_info); | |
880 | if (ret != 0) { | |
881 | dev_err(&pdev->dev,"Failed to register framebuffer\n"); | |
882 | goto error_register; | |
883 | } | |
884 | ||
885 | if (!host->enabled) { | |
886 | writel(0, host->base + LCDC_CTRL); | |
887 | mxsfb_set_par(fb_info); | |
888 | mxsfb_enable_controller(fb_info); | |
889 | } | |
890 | ||
891 | dev_info(&pdev->dev, "initialized\n"); | |
892 | ||
893 | return 0; | |
894 | ||
895 | error_register: | |
896 | if (host->enabled) | |
ca4c22d3 | 897 | clk_disable_unprepare(host->clk); |
f0a523b5 SH |
898 | fb_destroy_modelist(&fb_info->modelist); |
899 | error_init_fb: | |
900 | kfree(fb_info->pseudo_palette); | |
901 | error_pseudo_pallette: | |
73fc610f | 902 | error_panel_enable: |
f0a523b5 SH |
903 | clk_put(host->clk); |
904 | error_getclock: | |
fe233b9d | 905 | error_getpin: |
f0a523b5 SH |
906 | iounmap(host->base); |
907 | error_ioremap: | |
908 | framebuffer_release(fb_info); | |
909 | error_alloc_info: | |
910 | release_mem_region(res->start, resource_size(res)); | |
911 | ||
912 | return ret; | |
913 | } | |
914 | ||
915 | static int __devexit mxsfb_remove(struct platform_device *pdev) | |
916 | { | |
917 | struct fb_info *fb_info = platform_get_drvdata(pdev); | |
918 | struct mxsfb_info *host = to_imxfb_host(fb_info); | |
919 | struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
920 | ||
921 | if (host->enabled) | |
922 | mxsfb_disable_controller(fb_info); | |
923 | ||
924 | unregister_framebuffer(fb_info); | |
925 | kfree(fb_info->pseudo_palette); | |
926 | mxsfb_free_videomem(host); | |
927 | iounmap(host->base); | |
928 | clk_put(host->clk); | |
929 | ||
930 | framebuffer_release(fb_info); | |
931 | release_mem_region(res->start, resource_size(res)); | |
932 | ||
933 | platform_set_drvdata(pdev, NULL); | |
934 | ||
935 | return 0; | |
936 | } | |
937 | ||
d313a86d MV |
938 | static void mxsfb_shutdown(struct platform_device *pdev) |
939 | { | |
940 | struct fb_info *fb_info = platform_get_drvdata(pdev); | |
941 | struct mxsfb_info *host = to_imxfb_host(fb_info); | |
942 | ||
943 | /* | |
944 | * Force stop the LCD controller as keeping it running during reboot | |
945 | * might interfere with the BootROM's boot mode pads sampling. | |
946 | */ | |
947 | writel(CTRL_RUN, host->base + LCDC_CTRL + REG_CLR); | |
948 | } | |
949 | ||
f0a523b5 SH |
950 | static struct platform_driver mxsfb_driver = { |
951 | .probe = mxsfb_probe, | |
952 | .remove = __devexit_p(mxsfb_remove), | |
d313a86d | 953 | .shutdown = mxsfb_shutdown, |
f0a523b5 SH |
954 | .id_table = mxsfb_devtype, |
955 | .driver = { | |
956 | .name = DRIVER_NAME, | |
73fc610f | 957 | .of_match_table = mxsfb_dt_ids, |
f0a523b5 SH |
958 | }, |
959 | }; | |
960 | ||
396fa99e | 961 | module_platform_driver(mxsfb_driver); |
f0a523b5 SH |
962 | |
963 | MODULE_DESCRIPTION("Freescale mxs framebuffer driver"); | |
964 | MODULE_AUTHOR("Sascha Hauer, Pengutronix"); | |
965 | MODULE_LICENSE("GPL"); |