1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2008
4 * Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
5 *
6 * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
7 */
8
9 #include <linux/module.h>
10 #include <linux/kernel.h>
11 #include <linux/platform_device.h>
12 #include <linux/sched.h>
13 #include <linux/errno.h>
14 #include <linux/string.h>
15 #include <linux/interrupt.h>
16 #include <linux/slab.h>
17 #include <linux/fb.h>
18 #include <linux/delay.h>
19 #include <linux/init.h>
20 #include <linux/ioport.h>
21 #include <linux/dma-mapping.h>
22 #include <linux/dmaengine.h>
23 #include <linux/console.h>
24 #include <linux/clk.h>
25 #include <linux/mutex.h>
26 #include <linux/dma/ipu-dma.h>
27 #include <linux/backlight.h>
28
29 #include <linux/platform_data/dma-imx.h>
30 #include <linux/platform_data/video-mx3fb.h>
31
32 #include <asm/io.h>
33 #include <linux/uaccess.h>
34
35 #define MX3FB_NAME "mx3_sdc_fb"
36
37 #define MX3FB_REG_OFFSET 0xB4
38
39 /* SDC Registers */
40 #define SDC_COM_CONF (0xB4 - MX3FB_REG_OFFSET)
41 #define SDC_GW_CTRL (0xB8 - MX3FB_REG_OFFSET)
42 #define SDC_FG_POS (0xBC - MX3FB_REG_OFFSET)
43 #define SDC_BG_POS (0xC0 - MX3FB_REG_OFFSET)
44 #define SDC_CUR_POS (0xC4 - MX3FB_REG_OFFSET)
45 #define SDC_PWM_CTRL (0xC8 - MX3FB_REG_OFFSET)
46 #define SDC_CUR_MAP (0xCC - MX3FB_REG_OFFSET)
47 #define SDC_HOR_CONF (0xD0 - MX3FB_REG_OFFSET)
48 #define SDC_VER_CONF (0xD4 - MX3FB_REG_OFFSET)
49 #define SDC_SHARP_CONF_1 (0xD8 - MX3FB_REG_OFFSET)
50 #define SDC_SHARP_CONF_2 (0xDC - MX3FB_REG_OFFSET)
51
52 /* Register bits */
53 #define SDC_COM_TFT_COLOR 0x00000001UL
54 #define SDC_COM_FG_EN 0x00000010UL
55 #define SDC_COM_GWSEL 0x00000020UL
56 #define SDC_COM_GLB_A 0x00000040UL
57 #define SDC_COM_KEY_COLOR_G 0x00000080UL
58 #define SDC_COM_BG_EN 0x00000200UL
59 #define SDC_COM_SHARP 0x00001000UL
60
61 #define SDC_V_SYNC_WIDTH_L 0x00000001UL
62
63 /* Display Interface registers */
64 #define DI_DISP_IF_CONF (0x0124 - MX3FB_REG_OFFSET)
65 #define DI_DISP_SIG_POL (0x0128 - MX3FB_REG_OFFSET)
66 #define DI_SER_DISP1_CONF (0x012C - MX3FB_REG_OFFSET)
67 #define DI_SER_DISP2_CONF (0x0130 - MX3FB_REG_OFFSET)
68 #define DI_HSP_CLK_PER (0x0134 - MX3FB_REG_OFFSET)
69 #define DI_DISP0_TIME_CONF_1 (0x0138 - MX3FB_REG_OFFSET)
70 #define DI_DISP0_TIME_CONF_2 (0x013C - MX3FB_REG_OFFSET)
71 #define DI_DISP0_TIME_CONF_3 (0x0140 - MX3FB_REG_OFFSET)
72 #define DI_DISP1_TIME_CONF_1 (0x0144 - MX3FB_REG_OFFSET)
73 #define DI_DISP1_TIME_CONF_2 (0x0148 - MX3FB_REG_OFFSET)
74 #define DI_DISP1_TIME_CONF_3 (0x014C - MX3FB_REG_OFFSET)
75 #define DI_DISP2_TIME_CONF_1 (0x0150 - MX3FB_REG_OFFSET)
76 #define DI_DISP2_TIME_CONF_2 (0x0154 - MX3FB_REG_OFFSET)
77 #define DI_DISP2_TIME_CONF_3 (0x0158 - MX3FB_REG_OFFSET)
78 #define DI_DISP3_TIME_CONF (0x015C - MX3FB_REG_OFFSET)
79 #define DI_DISP0_DB0_MAP (0x0160 - MX3FB_REG_OFFSET)
80 #define DI_DISP0_DB1_MAP (0x0164 - MX3FB_REG_OFFSET)
81 #define DI_DISP0_DB2_MAP (0x0168 - MX3FB_REG_OFFSET)
82 #define DI_DISP0_CB0_MAP (0x016C - MX3FB_REG_OFFSET)
83 #define DI_DISP0_CB1_MAP (0x0170 - MX3FB_REG_OFFSET)
84 #define DI_DISP0_CB2_MAP (0x0174 - MX3FB_REG_OFFSET)
85 #define DI_DISP1_DB0_MAP (0x0178 - MX3FB_REG_OFFSET)
86 #define DI_DISP1_DB1_MAP (0x017C - MX3FB_REG_OFFSET)
87 #define DI_DISP1_DB2_MAP (0x0180 - MX3FB_REG_OFFSET)
88 #define DI_DISP1_CB0_MAP (0x0184 - MX3FB_REG_OFFSET)
89 #define DI_DISP1_CB1_MAP (0x0188 - MX3FB_REG_OFFSET)
90 #define DI_DISP1_CB2_MAP (0x018C - MX3FB_REG_OFFSET)
91 #define DI_DISP2_DB0_MAP (0x0190 - MX3FB_REG_OFFSET)
92 #define DI_DISP2_DB1_MAP (0x0194 - MX3FB_REG_OFFSET)
93 #define DI_DISP2_DB2_MAP (0x0198 - MX3FB_REG_OFFSET)
94 #define DI_DISP2_CB0_MAP (0x019C - MX3FB_REG_OFFSET)
95 #define DI_DISP2_CB1_MAP (0x01A0 - MX3FB_REG_OFFSET)
96 #define DI_DISP2_CB2_MAP (0x01A4 - MX3FB_REG_OFFSET)
97 #define DI_DISP3_B0_MAP (0x01A8 - MX3FB_REG_OFFSET)
98 #define DI_DISP3_B1_MAP (0x01AC - MX3FB_REG_OFFSET)
99 #define DI_DISP3_B2_MAP (0x01B0 - MX3FB_REG_OFFSET)
100 #define DI_DISP_ACC_CC (0x01B4 - MX3FB_REG_OFFSET)
101 #define DI_DISP_LLA_CONF (0x01B8 - MX3FB_REG_OFFSET)
102 #define DI_DISP_LLA_DATA (0x01BC - MX3FB_REG_OFFSET)
103
104 /* DI_DISP_SIG_POL bits */
105 #define DI_D3_VSYNC_POL_SHIFT 28
106 #define DI_D3_HSYNC_POL_SHIFT 27
107 #define DI_D3_DRDY_SHARP_POL_SHIFT 26
108 #define DI_D3_CLK_POL_SHIFT 25
109 #define DI_D3_DATA_POL_SHIFT 24
110
111 /* DI_DISP_IF_CONF bits */
112 #define DI_D3_CLK_IDLE_SHIFT 26
113 #define DI_D3_CLK_SEL_SHIFT 25
114 #define DI_D3_DATAMSK_SHIFT 24
115
116 enum ipu_panel {
117 IPU_PANEL_SHARP_TFT,
118 IPU_PANEL_TFT,
119 };
120
121 struct ipu_di_signal_cfg {
122 unsigned datamask_en:1;
123 unsigned clksel_en:1;
124 unsigned clkidle_en:1;
125 unsigned data_pol:1; /* true = inverted */
126 unsigned clk_pol:1; /* true = rising edge */
127 unsigned enable_pol:1;
128 unsigned Hsync_pol:1; /* true = active high */
129 unsigned Vsync_pol:1;
130 };
131
132 static const struct fb_videomode mx3fb_modedb[] = {
133 {
134 /* 240x320 @ 60 Hz */
135 .name = "Sharp-QVGA",
136 .refresh = 60,
137 .xres = 240,
138 .yres = 320,
139 .pixclock = 185925,
140 .left_margin = 9,
141 .right_margin = 16,
142 .upper_margin = 7,
143 .lower_margin = 9,
144 .hsync_len = 1,
145 .vsync_len = 1,
146 .sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_SHARP_MODE |
147 FB_SYNC_CLK_INVERT | FB_SYNC_DATA_INVERT |
148 FB_SYNC_CLK_IDLE_EN,
149 .vmode = FB_VMODE_NONINTERLACED,
150 .flag = 0,
151 }, {
152 /* 240x33 @ 60 Hz */
153 .name = "Sharp-CLI",
154 .refresh = 60,
155 .xres = 240,
156 .yres = 33,
157 .pixclock = 185925,
158 .left_margin = 9,
159 .right_margin = 16,
160 .upper_margin = 7,
161 .lower_margin = 9 + 287,
162 .hsync_len = 1,
163 .vsync_len = 1,
164 .sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_SHARP_MODE |
165 FB_SYNC_CLK_INVERT | FB_SYNC_DATA_INVERT |
166 FB_SYNC_CLK_IDLE_EN,
167 .vmode = FB_VMODE_NONINTERLACED,
168 .flag = 0,
169 }, {
170 /* 640x480 @ 60 Hz */
171 .name = "NEC-VGA",
172 .refresh = 60,
173 .xres = 640,
174 .yres = 480,
175 .pixclock = 38255,
176 .left_margin = 144,
177 .right_margin = 0,
178 .upper_margin = 34,
179 .lower_margin = 40,
180 .hsync_len = 1,
181 .vsync_len = 1,
182 .sync = FB_SYNC_VERT_HIGH_ACT | FB_SYNC_OE_ACT_HIGH,
183 .vmode = FB_VMODE_NONINTERLACED,
184 .flag = 0,
185 }, {
186 /* NTSC TV output */
187 .name = "TV-NTSC",
188 .refresh = 60,
189 .xres = 640,
190 .yres = 480,
191 .pixclock = 37538,
192 .left_margin = 38,
193 .right_margin = 858 - 640 - 38 - 3,
194 .upper_margin = 36,
195 .lower_margin = 518 - 480 - 36 - 1,
196 .hsync_len = 3,
197 .vsync_len = 1,
198 .sync = 0,
199 .vmode = FB_VMODE_NONINTERLACED,
200 .flag = 0,
201 }, {
202 /* PAL TV output */
203 .name = "TV-PAL",
204 .refresh = 50,
205 .xres = 640,
206 .yres = 480,
207 .pixclock = 37538,
208 .left_margin = 38,
209 .right_margin = 960 - 640 - 38 - 32,
210 .upper_margin = 32,
211 .lower_margin = 555 - 480 - 32 - 3,
212 .hsync_len = 32,
213 .vsync_len = 3,
214 .sync = 0,
215 .vmode = FB_VMODE_NONINTERLACED,
216 .flag = 0,
217 }, {
218 /* TV output VGA mode, 640x480 @ 65 Hz */
219 .name = "TV-VGA",
220 .refresh = 60,
221 .xres = 640,
222 .yres = 480,
223 .pixclock = 40574,
224 .left_margin = 35,
225 .right_margin = 45,
226 .upper_margin = 9,
227 .lower_margin = 1,
228 .hsync_len = 46,
229 .vsync_len = 5,
230 .sync = 0,
231 .vmode = FB_VMODE_NONINTERLACED,
232 .flag = 0,
233 },
234 };
235
236 struct mx3fb_data {
237 struct fb_info *fbi;
238 int backlight_level;
239 void __iomem *reg_base;
240 spinlock_t lock;
241 struct device *dev;
242 struct backlight_device *bl;
243
244 uint32_t h_start_width;
245 uint32_t v_start_width;
246 enum disp_data_mapping disp_data_fmt;
247 };
248
249 struct dma_chan_request {
250 struct mx3fb_data *mx3fb;
251 enum ipu_channel id;
252 };
253
254 /* MX3 specific framebuffer information. */
255 struct mx3fb_info {
256 int blank;
257 enum ipu_channel ipu_ch;
258 uint32_t cur_ipu_buf;
259
260 u32 pseudo_palette[16];
261
262 struct completion flip_cmpl;
263 struct mutex mutex; /* Protects fb-ops */
264 struct mx3fb_data *mx3fb;
265 struct idmac_channel *idmac_channel;
266 struct dma_async_tx_descriptor *txd;
267 dma_cookie_t cookie;
268 struct scatterlist sg[2];
269
270 struct fb_var_screeninfo cur_var; /* current var info */
271 };
272
273 static void sdc_set_brightness(struct mx3fb_data *mx3fb, uint8_t value);
274 static u32 sdc_get_brightness(struct mx3fb_data *mx3fb);
275
mx3fb_bl_get_brightness(struct backlight_device * bl)276 static int mx3fb_bl_get_brightness(struct backlight_device *bl)
277 {
278 struct mx3fb_data *fbd = bl_get_data(bl);
279
280 return sdc_get_brightness(fbd);
281 }
282
mx3fb_bl_update_status(struct backlight_device * bl)283 static int mx3fb_bl_update_status(struct backlight_device *bl)
284 {
285 struct mx3fb_data *fbd = bl_get_data(bl);
286 int brightness = bl->props.brightness;
287
288 if (bl->props.power != FB_BLANK_UNBLANK)
289 brightness = 0;
290 if (bl->props.fb_blank != FB_BLANK_UNBLANK)
291 brightness = 0;
292
293 fbd->backlight_level = (fbd->backlight_level & ~0xFF) | brightness;
294
295 sdc_set_brightness(fbd, fbd->backlight_level);
296
297 return 0;
298 }
299
300 static const struct backlight_ops mx3fb_lcdc_bl_ops = {
301 .update_status = mx3fb_bl_update_status,
302 .get_brightness = mx3fb_bl_get_brightness,
303 };
304
mx3fb_init_backlight(struct mx3fb_data * fbd)305 static void mx3fb_init_backlight(struct mx3fb_data *fbd)
306 {
307 struct backlight_properties props;
308 struct backlight_device *bl;
309
310 if (fbd->bl)
311 return;
312
313 memset(&props, 0, sizeof(struct backlight_properties));
314 props.max_brightness = 0xff;
315 props.type = BACKLIGHT_RAW;
316 sdc_set_brightness(fbd, fbd->backlight_level);
317
318 bl = backlight_device_register("mx3fb-bl", fbd->dev, fbd,
319 &mx3fb_lcdc_bl_ops, &props);
320 if (IS_ERR(bl)) {
321 dev_err(fbd->dev, "error %ld on backlight register\n",
322 PTR_ERR(bl));
323 return;
324 }
325
326 fbd->bl = bl;
327 bl->props.power = FB_BLANK_UNBLANK;
328 bl->props.fb_blank = FB_BLANK_UNBLANK;
329 bl->props.brightness = mx3fb_bl_get_brightness(bl);
330 }
331
mx3fb_exit_backlight(struct mx3fb_data * fbd)332 static void mx3fb_exit_backlight(struct mx3fb_data *fbd)
333 {
334 backlight_device_unregister(fbd->bl);
335 }
336
337 static void mx3fb_dma_done(void *);
338
339 /* Used fb-mode and bpp. Can be set on kernel command line, therefore file-static. */
340 static const char *fb_mode;
341 static unsigned long default_bpp = 16;
342
mx3fb_read_reg(struct mx3fb_data * mx3fb,unsigned long reg)343 static u32 mx3fb_read_reg(struct mx3fb_data *mx3fb, unsigned long reg)
344 {
345 return __raw_readl(mx3fb->reg_base + reg);
346 }
347
mx3fb_write_reg(struct mx3fb_data * mx3fb,u32 value,unsigned long reg)348 static void mx3fb_write_reg(struct mx3fb_data *mx3fb, u32 value, unsigned long reg)
349 {
350 __raw_writel(value, mx3fb->reg_base + reg);
351 }
352
353 struct di_mapping {
354 uint32_t b0, b1, b2;
355 };
356
357 static const struct di_mapping di_mappings[] = {
358 [IPU_DISP_DATA_MAPPING_RGB666] = { 0x0005000f, 0x000b000f, 0x0011000f },
359 [IPU_DISP_DATA_MAPPING_RGB565] = { 0x0004003f, 0x000a000f, 0x000f003f },
360 [IPU_DISP_DATA_MAPPING_RGB888] = { 0x00070000, 0x000f0000, 0x00170000 },
361 };
362
sdc_fb_init(struct mx3fb_info * fbi)363 static void sdc_fb_init(struct mx3fb_info *fbi)
364 {
365 struct mx3fb_data *mx3fb = fbi->mx3fb;
366 uint32_t reg;
367
368 reg = mx3fb_read_reg(mx3fb, SDC_COM_CONF);
369
370 mx3fb_write_reg(mx3fb, reg | SDC_COM_BG_EN, SDC_COM_CONF);
371 }
372
373 /* Returns enabled flag before uninit */
sdc_fb_uninit(struct mx3fb_info * fbi)374 static uint32_t sdc_fb_uninit(struct mx3fb_info *fbi)
375 {
376 struct mx3fb_data *mx3fb = fbi->mx3fb;
377 uint32_t reg;
378
379 reg = mx3fb_read_reg(mx3fb, SDC_COM_CONF);
380
381 mx3fb_write_reg(mx3fb, reg & ~SDC_COM_BG_EN, SDC_COM_CONF);
382
383 return reg & SDC_COM_BG_EN;
384 }
385
sdc_enable_channel(struct mx3fb_info * mx3_fbi)386 static void sdc_enable_channel(struct mx3fb_info *mx3_fbi)
387 {
388 struct mx3fb_data *mx3fb = mx3_fbi->mx3fb;
389 struct idmac_channel *ichan = mx3_fbi->idmac_channel;
390 struct dma_chan *dma_chan = &ichan->dma_chan;
391 unsigned long flags;
392 dma_cookie_t cookie;
393
394 if (mx3_fbi->txd)
395 dev_dbg(mx3fb->dev, "mx3fbi %p, desc %p, sg %p\n", mx3_fbi,
396 to_tx_desc(mx3_fbi->txd), to_tx_desc(mx3_fbi->txd)->sg);
397 else
398 dev_dbg(mx3fb->dev, "mx3fbi %p, txd = NULL\n", mx3_fbi);
399
400 /* This enables the channel */
401 if (mx3_fbi->cookie < 0) {
402 mx3_fbi->txd = dmaengine_prep_slave_sg(dma_chan,
403 &mx3_fbi->sg[0], 1, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
404 if (!mx3_fbi->txd) {
405 dev_err(mx3fb->dev, "Cannot allocate descriptor on %d\n",
406 dma_chan->chan_id);
407 return;
408 }
409
410 mx3_fbi->txd->callback_param = mx3_fbi->txd;
411 mx3_fbi->txd->callback = mx3fb_dma_done;
412
413 cookie = mx3_fbi->txd->tx_submit(mx3_fbi->txd);
414 dev_dbg(mx3fb->dev, "%d: Submit %p #%d [%c]\n", __LINE__,
415 mx3_fbi->txd, cookie, list_empty(&ichan->queue) ? '-' : '+');
416 } else {
417 if (!mx3_fbi->txd || !mx3_fbi->txd->tx_submit) {
418 dev_err(mx3fb->dev, "Cannot enable channel %d\n",
419 dma_chan->chan_id);
420 return;
421 }
422
423 /* Just re-activate the same buffer */
424 dma_async_issue_pending(dma_chan);
425 cookie = mx3_fbi->cookie;
426 dev_dbg(mx3fb->dev, "%d: Re-submit %p #%d [%c]\n", __LINE__,
427 mx3_fbi->txd, cookie, list_empty(&ichan->queue) ? '-' : '+');
428 }
429
430 if (cookie >= 0) {
431 spin_lock_irqsave(&mx3fb->lock, flags);
432 sdc_fb_init(mx3_fbi);
433 mx3_fbi->cookie = cookie;
434 spin_unlock_irqrestore(&mx3fb->lock, flags);
435 }
436
437 /*
438 * Attention! Without this msleep the channel keeps generating
439 * interrupts. Next sdc_set_brightness() is going to be called
440 * from mx3fb_blank().
441 */
442 msleep(2);
443 }
444
sdc_disable_channel(struct mx3fb_info * mx3_fbi)445 static void sdc_disable_channel(struct mx3fb_info *mx3_fbi)
446 {
447 struct mx3fb_data *mx3fb = mx3_fbi->mx3fb;
448 unsigned long flags;
449
450 if (mx3_fbi->txd == NULL)
451 return;
452
453 spin_lock_irqsave(&mx3fb->lock, flags);
454
455 sdc_fb_uninit(mx3_fbi);
456
457 spin_unlock_irqrestore(&mx3fb->lock, flags);
458
459 dmaengine_terminate_all(mx3_fbi->txd->chan);
460 mx3_fbi->txd = NULL;
461 mx3_fbi->cookie = -EINVAL;
462 }
463
464 /**
465 * sdc_set_window_pos() - set window position of the respective plane.
466 * @mx3fb: mx3fb context.
467 * @channel: IPU DMAC channel ID.
468 * @x_pos: X coordinate relative to the top left corner to place window at.
469 * @y_pos: Y coordinate relative to the top left corner to place window at.
470 * @return: 0 on success or negative error code on failure.
471 */
sdc_set_window_pos(struct mx3fb_data * mx3fb,enum ipu_channel channel,int16_t x_pos,int16_t y_pos)472 static int sdc_set_window_pos(struct mx3fb_data *mx3fb, enum ipu_channel channel,
473 int16_t x_pos, int16_t y_pos)
474 {
475 if (channel != IDMAC_SDC_0)
476 return -EINVAL;
477
478 x_pos += mx3fb->h_start_width;
479 y_pos += mx3fb->v_start_width;
480
481 mx3fb_write_reg(mx3fb, (x_pos << 16) | y_pos, SDC_BG_POS);
482 return 0;
483 }
484
485 /**
486 * sdc_init_panel() - initialize a synchronous LCD panel.
487 * @mx3fb: mx3fb context.
488 * @panel: panel type.
489 * @pixel_clk: desired pixel clock frequency in Hz.
490 * @width: width of panel in pixels.
491 * @height: height of panel in pixels.
492 * @h_start_width: number of pixel clocks between the HSYNC signal pulse
493 * and the start of valid data.
494 * @h_sync_width: width of the HSYNC signal in units of pixel clocks.
495 * @h_end_width: number of pixel clocks between the end of valid data
496 * and the HSYNC signal for next line.
497 * @v_start_width: number of lines between the VSYNC signal pulse and the
498 * start of valid data.
499 * @v_sync_width: width of the VSYNC signal in units of lines
500 * @v_end_width: number of lines between the end of valid data and the
501 * VSYNC signal for next frame.
502 * @sig: bitfield of signal polarities for LCD interface.
503 * @return: 0 on success or negative error code on failure.
504 */
sdc_init_panel(struct mx3fb_data * mx3fb,enum ipu_panel panel,uint32_t pixel_clk,uint16_t width,uint16_t height,uint16_t h_start_width,uint16_t h_sync_width,uint16_t h_end_width,uint16_t v_start_width,uint16_t v_sync_width,uint16_t v_end_width,const struct ipu_di_signal_cfg * sig)505 static int sdc_init_panel(struct mx3fb_data *mx3fb, enum ipu_panel panel,
506 uint32_t pixel_clk,
507 uint16_t width, uint16_t height,
508 uint16_t h_start_width, uint16_t h_sync_width,
509 uint16_t h_end_width, uint16_t v_start_width,
510 uint16_t v_sync_width, uint16_t v_end_width,
511 const struct ipu_di_signal_cfg *sig)
512 {
513 unsigned long lock_flags;
514 uint32_t reg;
515 uint32_t old_conf;
516 uint32_t div;
517 struct clk *ipu_clk;
518 const struct di_mapping *map;
519
520 dev_dbg(mx3fb->dev, "panel size = %d x %d", width, height);
521
522 if (v_sync_width == 0 || h_sync_width == 0)
523 return -EINVAL;
524
525 /* Init panel size and blanking periods */
526 reg = ((uint32_t) (h_sync_width - 1) << 26) |
527 ((uint32_t) (width + h_start_width + h_end_width - 1) << 16);
528 mx3fb_write_reg(mx3fb, reg, SDC_HOR_CONF);
529
530 #ifdef DEBUG
531 printk(KERN_CONT " hor_conf %x,", reg);
532 #endif
533
534 reg = ((uint32_t) (v_sync_width - 1) << 26) | SDC_V_SYNC_WIDTH_L |
535 ((uint32_t) (height + v_start_width + v_end_width - 1) << 16);
536 mx3fb_write_reg(mx3fb, reg, SDC_VER_CONF);
537
538 #ifdef DEBUG
539 printk(KERN_CONT " ver_conf %x\n", reg);
540 #endif
541
542 mx3fb->h_start_width = h_start_width;
543 mx3fb->v_start_width = v_start_width;
544
545 switch (panel) {
546 case IPU_PANEL_SHARP_TFT:
547 mx3fb_write_reg(mx3fb, 0x00FD0102L, SDC_SHARP_CONF_1);
548 mx3fb_write_reg(mx3fb, 0x00F500F4L, SDC_SHARP_CONF_2);
549 mx3fb_write_reg(mx3fb, SDC_COM_SHARP | SDC_COM_TFT_COLOR, SDC_COM_CONF);
550 break;
551 case IPU_PANEL_TFT:
552 mx3fb_write_reg(mx3fb, SDC_COM_TFT_COLOR, SDC_COM_CONF);
553 break;
554 default:
555 return -EINVAL;
556 }
557
558 /* Init clocking */
559
560 /*
561 * Calculate divider: fractional part is 4 bits so simply multiple by
562 * 2^4 to get fractional part, as long as we stay under ~250MHz and on
563 * i.MX31 it (HSP_CLK) is <= 178MHz. Currently 128.267MHz
564 */
565 ipu_clk = clk_get(mx3fb->dev, NULL);
566 if (!IS_ERR(ipu_clk)) {
567 div = clk_get_rate(ipu_clk) * 16 / pixel_clk;
568 clk_put(ipu_clk);
569 } else {
570 div = 0;
571 }
572
573 if (div < 0x40) { /* Divider less than 4 */
574 dev_dbg(mx3fb->dev,
575 "InitPanel() - Pixel clock divider less than 4\n");
576 div = 0x40;
577 }
578
579 dev_dbg(mx3fb->dev, "pixel clk = %u, divider %u.%u\n",
580 pixel_clk, div >> 4, (div & 7) * 125);
581
582 spin_lock_irqsave(&mx3fb->lock, lock_flags);
583
584 /*
585 * DISP3_IF_CLK_DOWN_WR is half the divider value and 2 fraction bits
586 * fewer. Subtract 1 extra from DISP3_IF_CLK_DOWN_WR based on timing
587 * debug. DISP3_IF_CLK_UP_WR is 0
588 */
589 mx3fb_write_reg(mx3fb, (((div / 8) - 1) << 22) | div, DI_DISP3_TIME_CONF);
590
591 /* DI settings */
592 old_conf = mx3fb_read_reg(mx3fb, DI_DISP_IF_CONF) & 0x78FFFFFF;
593 old_conf |= sig->datamask_en << DI_D3_DATAMSK_SHIFT |
594 sig->clksel_en << DI_D3_CLK_SEL_SHIFT |
595 sig->clkidle_en << DI_D3_CLK_IDLE_SHIFT;
596 mx3fb_write_reg(mx3fb, old_conf, DI_DISP_IF_CONF);
597
598 old_conf = mx3fb_read_reg(mx3fb, DI_DISP_SIG_POL) & 0xE0FFFFFF;
599 old_conf |= sig->data_pol << DI_D3_DATA_POL_SHIFT |
600 sig->clk_pol << DI_D3_CLK_POL_SHIFT |
601 sig->enable_pol << DI_D3_DRDY_SHARP_POL_SHIFT |
602 sig->Hsync_pol << DI_D3_HSYNC_POL_SHIFT |
603 sig->Vsync_pol << DI_D3_VSYNC_POL_SHIFT;
604 mx3fb_write_reg(mx3fb, old_conf, DI_DISP_SIG_POL);
605
606 map = &di_mappings[mx3fb->disp_data_fmt];
607 mx3fb_write_reg(mx3fb, map->b0, DI_DISP3_B0_MAP);
608 mx3fb_write_reg(mx3fb, map->b1, DI_DISP3_B1_MAP);
609 mx3fb_write_reg(mx3fb, map->b2, DI_DISP3_B2_MAP);
610
611 spin_unlock_irqrestore(&mx3fb->lock, lock_flags);
612
613 dev_dbg(mx3fb->dev, "DI_DISP_IF_CONF = 0x%08X\n",
614 mx3fb_read_reg(mx3fb, DI_DISP_IF_CONF));
615 dev_dbg(mx3fb->dev, "DI_DISP_SIG_POL = 0x%08X\n",
616 mx3fb_read_reg(mx3fb, DI_DISP_SIG_POL));
617 dev_dbg(mx3fb->dev, "DI_DISP3_TIME_CONF = 0x%08X\n",
618 mx3fb_read_reg(mx3fb, DI_DISP3_TIME_CONF));
619
620 return 0;
621 }
622
623 /**
624 * sdc_set_color_key() - set the transparent color key for SDC graphic plane.
625 * @mx3fb: mx3fb context.
626 * @channel: IPU DMAC channel ID.
627 * @enable: boolean to enable or disable color keyl.
628 * @color_key: 24-bit RGB color to use as transparent color key.
629 * @return: 0 on success or negative error code on failure.
630 */
sdc_set_color_key(struct mx3fb_data * mx3fb,enum ipu_channel channel,bool enable,uint32_t color_key)631 static int sdc_set_color_key(struct mx3fb_data *mx3fb, enum ipu_channel channel,
632 bool enable, uint32_t color_key)
633 {
634 uint32_t reg, sdc_conf;
635 unsigned long lock_flags;
636
637 spin_lock_irqsave(&mx3fb->lock, lock_flags);
638
639 sdc_conf = mx3fb_read_reg(mx3fb, SDC_COM_CONF);
640 if (channel == IDMAC_SDC_0)
641 sdc_conf &= ~SDC_COM_GWSEL;
642 else
643 sdc_conf |= SDC_COM_GWSEL;
644
645 if (enable) {
646 reg = mx3fb_read_reg(mx3fb, SDC_GW_CTRL) & 0xFF000000L;
647 mx3fb_write_reg(mx3fb, reg | (color_key & 0x00FFFFFFL),
648 SDC_GW_CTRL);
649
650 sdc_conf |= SDC_COM_KEY_COLOR_G;
651 } else {
652 sdc_conf &= ~SDC_COM_KEY_COLOR_G;
653 }
654 mx3fb_write_reg(mx3fb, sdc_conf, SDC_COM_CONF);
655
656 spin_unlock_irqrestore(&mx3fb->lock, lock_flags);
657
658 return 0;
659 }
660
661 /**
662 * sdc_set_global_alpha() - set global alpha blending modes.
663 * @mx3fb: mx3fb context.
664 * @enable: boolean to enable or disable global alpha blending. If disabled,
665 * per pixel blending is used.
666 * @alpha: global alpha value.
667 * @return: 0 on success or negative error code on failure.
668 */
sdc_set_global_alpha(struct mx3fb_data * mx3fb,bool enable,uint8_t alpha)669 static int sdc_set_global_alpha(struct mx3fb_data *mx3fb, bool enable, uint8_t alpha)
670 {
671 uint32_t reg;
672 unsigned long lock_flags;
673
674 spin_lock_irqsave(&mx3fb->lock, lock_flags);
675
676 if (enable) {
677 reg = mx3fb_read_reg(mx3fb, SDC_GW_CTRL) & 0x00FFFFFFL;
678 mx3fb_write_reg(mx3fb, reg | ((uint32_t) alpha << 24), SDC_GW_CTRL);
679
680 reg = mx3fb_read_reg(mx3fb, SDC_COM_CONF);
681 mx3fb_write_reg(mx3fb, reg | SDC_COM_GLB_A, SDC_COM_CONF);
682 } else {
683 reg = mx3fb_read_reg(mx3fb, SDC_COM_CONF);
684 mx3fb_write_reg(mx3fb, reg & ~SDC_COM_GLB_A, SDC_COM_CONF);
685 }
686
687 spin_unlock_irqrestore(&mx3fb->lock, lock_flags);
688
689 return 0;
690 }
691
sdc_get_brightness(struct mx3fb_data * mx3fb)692 static u32 sdc_get_brightness(struct mx3fb_data *mx3fb)
693 {
694 u32 brightness;
695
696 brightness = mx3fb_read_reg(mx3fb, SDC_PWM_CTRL);
697 brightness = (brightness >> 16) & 0xFF;
698
699 return brightness;
700 }
701
sdc_set_brightness(struct mx3fb_data * mx3fb,uint8_t value)702 static void sdc_set_brightness(struct mx3fb_data *mx3fb, uint8_t value)
703 {
704 dev_dbg(mx3fb->dev, "%s: value = %d\n", __func__, value);
705 /* This might be board-specific */
706 mx3fb_write_reg(mx3fb, 0x03000000UL | value << 16, SDC_PWM_CTRL);
707 return;
708 }
709
bpp_to_pixfmt(int bpp)710 static uint32_t bpp_to_pixfmt(int bpp)
711 {
712 uint32_t pixfmt = 0;
713 switch (bpp) {
714 case 24:
715 pixfmt = IPU_PIX_FMT_BGR24;
716 break;
717 case 32:
718 pixfmt = IPU_PIX_FMT_BGR32;
719 break;
720 case 16:
721 pixfmt = IPU_PIX_FMT_RGB565;
722 break;
723 }
724 return pixfmt;
725 }
726
727 static int mx3fb_blank(int blank, struct fb_info *fbi);
728 static int mx3fb_map_video_memory(struct fb_info *fbi, unsigned int mem_len,
729 bool lock);
730 static int mx3fb_unmap_video_memory(struct fb_info *fbi);
731
732 /**
733 * mx3fb_set_fix() - set fixed framebuffer parameters from variable settings.
734 * @fbi: framebuffer information pointer
735 * @return: 0 on success or negative error code on failure.
736 */
mx3fb_set_fix(struct fb_info * fbi)737 static int mx3fb_set_fix(struct fb_info *fbi)
738 {
739 struct fb_fix_screeninfo *fix = &fbi->fix;
740 struct fb_var_screeninfo *var = &fbi->var;
741
742 memcpy(fix->id, "DISP3 BG", 8);
743
744 fix->line_length = var->xres_virtual * var->bits_per_pixel / 8;
745
746 fix->type = FB_TYPE_PACKED_PIXELS;
747 fix->accel = FB_ACCEL_NONE;
748 fix->visual = FB_VISUAL_TRUECOLOR;
749 fix->xpanstep = 1;
750 fix->ypanstep = 1;
751
752 return 0;
753 }
754
mx3fb_dma_done(void * arg)755 static void mx3fb_dma_done(void *arg)
756 {
757 struct idmac_tx_desc *tx_desc = to_tx_desc(arg);
758 struct dma_chan *chan = tx_desc->txd.chan;
759 struct idmac_channel *ichannel = to_idmac_chan(chan);
760 struct mx3fb_data *mx3fb = ichannel->client;
761 struct mx3fb_info *mx3_fbi = mx3fb->fbi->par;
762
763 dev_dbg(mx3fb->dev, "irq %d callback\n", ichannel->eof_irq);
764
765 /* We only need one interrupt, it will be re-enabled as needed */
766 disable_irq_nosync(ichannel->eof_irq);
767
768 complete(&mx3_fbi->flip_cmpl);
769 }
770
mx3fb_must_set_par(struct fb_info * fbi)771 static bool mx3fb_must_set_par(struct fb_info *fbi)
772 {
773 struct mx3fb_info *mx3_fbi = fbi->par;
774 struct fb_var_screeninfo old_var = mx3_fbi->cur_var;
775 struct fb_var_screeninfo new_var = fbi->var;
776
777 if ((fbi->var.activate & FB_ACTIVATE_FORCE) &&
778 (fbi->var.activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW)
779 return true;
780
781 /*
782 * Ignore xoffset and yoffset update,
783 * because pan display handles this case.
784 */
785 old_var.xoffset = new_var.xoffset;
786 old_var.yoffset = new_var.yoffset;
787
788 return !!memcmp(&old_var, &new_var, sizeof(struct fb_var_screeninfo));
789 }
790
__set_par(struct fb_info * fbi,bool lock)791 static int __set_par(struct fb_info *fbi, bool lock)
792 {
793 u32 mem_len, cur_xoffset, cur_yoffset;
794 struct ipu_di_signal_cfg sig_cfg;
795 enum ipu_panel mode = IPU_PANEL_TFT;
796 struct mx3fb_info *mx3_fbi = fbi->par;
797 struct mx3fb_data *mx3fb = mx3_fbi->mx3fb;
798 struct idmac_channel *ichan = mx3_fbi->idmac_channel;
799 struct idmac_video_param *video = &ichan->params.video;
800 struct scatterlist *sg = mx3_fbi->sg;
801
802 /* Total cleanup */
803 if (mx3_fbi->txd)
804 sdc_disable_channel(mx3_fbi);
805
806 mx3fb_set_fix(fbi);
807
808 mem_len = fbi->var.yres_virtual * fbi->fix.line_length;
809 if (mem_len > fbi->fix.smem_len) {
810 if (fbi->fix.smem_start)
811 mx3fb_unmap_video_memory(fbi);
812
813 if (mx3fb_map_video_memory(fbi, mem_len, lock) < 0)
814 return -ENOMEM;
815 }
816
817 sg_init_table(&sg[0], 1);
818 sg_init_table(&sg[1], 1);
819
820 sg_dma_address(&sg[0]) = fbi->fix.smem_start;
821 sg_set_page(&sg[0], virt_to_page(fbi->screen_base),
822 fbi->fix.smem_len,
823 offset_in_page(fbi->screen_base));
824
825 if (mx3_fbi->ipu_ch == IDMAC_SDC_0) {
826 memset(&sig_cfg, 0, sizeof(sig_cfg));
827 if (fbi->var.sync & FB_SYNC_HOR_HIGH_ACT)
828 sig_cfg.Hsync_pol = true;
829 if (fbi->var.sync & FB_SYNC_VERT_HIGH_ACT)
830 sig_cfg.Vsync_pol = true;
831 if (fbi->var.sync & FB_SYNC_CLK_INVERT)
832 sig_cfg.clk_pol = true;
833 if (fbi->var.sync & FB_SYNC_DATA_INVERT)
834 sig_cfg.data_pol = true;
835 if (fbi->var.sync & FB_SYNC_OE_ACT_HIGH)
836 sig_cfg.enable_pol = true;
837 if (fbi->var.sync & FB_SYNC_CLK_IDLE_EN)
838 sig_cfg.clkidle_en = true;
839 if (fbi->var.sync & FB_SYNC_CLK_SEL_EN)
840 sig_cfg.clksel_en = true;
841 if (fbi->var.sync & FB_SYNC_SHARP_MODE)
842 mode = IPU_PANEL_SHARP_TFT;
843
844 dev_dbg(fbi->device, "pixclock = %u Hz\n",
845 (u32) (PICOS2KHZ(fbi->var.pixclock) * 1000UL));
846
847 if (sdc_init_panel(mx3fb, mode,
848 (PICOS2KHZ(fbi->var.pixclock)) * 1000UL,
849 fbi->var.xres, fbi->var.yres,
850 fbi->var.left_margin,
851 fbi->var.hsync_len,
852 fbi->var.right_margin +
853 fbi->var.hsync_len,
854 fbi->var.upper_margin,
855 fbi->var.vsync_len,
856 fbi->var.lower_margin +
857 fbi->var.vsync_len, &sig_cfg) != 0) {
858 dev_err(fbi->device,
859 "mx3fb: Error initializing panel.\n");
860 return -EINVAL;
861 }
862 }
863
864 sdc_set_window_pos(mx3fb, mx3_fbi->ipu_ch, 0, 0);
865
866 mx3_fbi->cur_ipu_buf = 0;
867
868 video->out_pixel_fmt = bpp_to_pixfmt(fbi->var.bits_per_pixel);
869 video->out_width = fbi->var.xres;
870 video->out_height = fbi->var.yres;
871 video->out_stride = fbi->var.xres_virtual;
872
873 if (mx3_fbi->blank == FB_BLANK_UNBLANK) {
874 sdc_enable_channel(mx3_fbi);
875 /*
876 * sg[0] points to fb smem_start address
877 * and is actually active in controller.
878 */
879 mx3_fbi->cur_var.xoffset = 0;
880 mx3_fbi->cur_var.yoffset = 0;
881 }
882
883 /*
884 * Preserve xoffset and yoffest in case they are
885 * inactive in controller as fb is blanked.
886 */
887 cur_xoffset = mx3_fbi->cur_var.xoffset;
888 cur_yoffset = mx3_fbi->cur_var.yoffset;
889 mx3_fbi->cur_var = fbi->var;
890 mx3_fbi->cur_var.xoffset = cur_xoffset;
891 mx3_fbi->cur_var.yoffset = cur_yoffset;
892
893 return 0;
894 }
895
896 /**
897 * mx3fb_set_par() - set framebuffer parameters and change the operating mode.
898 * @fbi: framebuffer information pointer.
899 * @return: 0 on success or negative error code on failure.
900 */
mx3fb_set_par(struct fb_info * fbi)901 static int mx3fb_set_par(struct fb_info *fbi)
902 {
903 struct mx3fb_info *mx3_fbi = fbi->par;
904 struct mx3fb_data *mx3fb = mx3_fbi->mx3fb;
905 struct idmac_channel *ichan = mx3_fbi->idmac_channel;
906 int ret;
907
908 dev_dbg(mx3fb->dev, "%s [%c]\n", __func__, list_empty(&ichan->queue) ? '-' : '+');
909
910 mutex_lock(&mx3_fbi->mutex);
911
912 ret = mx3fb_must_set_par(fbi) ? __set_par(fbi, true) : 0;
913
914 mutex_unlock(&mx3_fbi->mutex);
915
916 return ret;
917 }
918
919 /**
920 * mx3fb_check_var() - check and adjust framebuffer variable parameters.
921 * @var: framebuffer variable parameters
922 * @fbi: framebuffer information pointer
923 */
mx3fb_check_var(struct fb_var_screeninfo * var,struct fb_info * fbi)924 static int mx3fb_check_var(struct fb_var_screeninfo *var, struct fb_info *fbi)
925 {
926 struct mx3fb_info *mx3_fbi = fbi->par;
927 u32 vtotal;
928 u32 htotal;
929
930 dev_dbg(fbi->device, "%s\n", __func__);
931
932 if (var->xres_virtual < var->xres)
933 var->xres_virtual = var->xres;
934 if (var->yres_virtual < var->yres)
935 var->yres_virtual = var->yres;
936
937 if ((var->bits_per_pixel != 32) && (var->bits_per_pixel != 24) &&
938 (var->bits_per_pixel != 16))
939 var->bits_per_pixel = default_bpp;
940
941 switch (var->bits_per_pixel) {
942 case 16:
943 var->red.length = 5;
944 var->red.offset = 11;
945 var->red.msb_right = 0;
946
947 var->green.length = 6;
948 var->green.offset = 5;
949 var->green.msb_right = 0;
950
951 var->blue.length = 5;
952 var->blue.offset = 0;
953 var->blue.msb_right = 0;
954
955 var->transp.length = 0;
956 var->transp.offset = 0;
957 var->transp.msb_right = 0;
958 break;
959 case 24:
960 var->red.length = 8;
961 var->red.offset = 16;
962 var->red.msb_right = 0;
963
964 var->green.length = 8;
965 var->green.offset = 8;
966 var->green.msb_right = 0;
967
968 var->blue.length = 8;
969 var->blue.offset = 0;
970 var->blue.msb_right = 0;
971
972 var->transp.length = 0;
973 var->transp.offset = 0;
974 var->transp.msb_right = 0;
975 break;
976 case 32:
977 var->red.length = 8;
978 var->red.offset = 16;
979 var->red.msb_right = 0;
980
981 var->green.length = 8;
982 var->green.offset = 8;
983 var->green.msb_right = 0;
984
985 var->blue.length = 8;
986 var->blue.offset = 0;
987 var->blue.msb_right = 0;
988
989 var->transp.length = 8;
990 var->transp.offset = 24;
991 var->transp.msb_right = 0;
992 break;
993 }
994
995 if (var->pixclock < 1000) {
996 htotal = var->xres + var->right_margin + var->hsync_len +
997 var->left_margin;
998 vtotal = var->yres + var->lower_margin + var->vsync_len +
999 var->upper_margin;
1000 var->pixclock = (vtotal * htotal * 6UL) / 100UL;
1001 var->pixclock = KHZ2PICOS(var->pixclock);
1002 dev_dbg(fbi->device, "pixclock set for 60Hz refresh = %u ps\n",
1003 var->pixclock);
1004 }
1005
1006 var->height = -1;
1007 var->width = -1;
1008 var->grayscale = 0;
1009
1010 /* Preserve sync flags */
1011 var->sync |= mx3_fbi->cur_var.sync;
1012 mx3_fbi->cur_var.sync |= var->sync;
1013
1014 return 0;
1015 }
1016
chan_to_field(unsigned int chan,struct fb_bitfield * bf)1017 static u32 chan_to_field(unsigned int chan, struct fb_bitfield *bf)
1018 {
1019 chan &= 0xffff;
1020 chan >>= 16 - bf->length;
1021 return chan << bf->offset;
1022 }
1023
mx3fb_setcolreg(unsigned int regno,unsigned int red,unsigned int green,unsigned int blue,unsigned int trans,struct fb_info * fbi)1024 static int mx3fb_setcolreg(unsigned int regno, unsigned int red,
1025 unsigned int green, unsigned int blue,
1026 unsigned int trans, struct fb_info *fbi)
1027 {
1028 struct mx3fb_info *mx3_fbi = fbi->par;
1029 u32 val;
1030 int ret = 1;
1031
1032 dev_dbg(fbi->device, "%s, regno = %u\n", __func__, regno);
1033
1034 mutex_lock(&mx3_fbi->mutex);
1035 /*
1036 * If greyscale is true, then we convert the RGB value
1037 * to greyscale no matter what visual we are using.
1038 */
1039 if (fbi->var.grayscale)
1040 red = green = blue = (19595 * red + 38470 * green +
1041 7471 * blue) >> 16;
1042 switch (fbi->fix.visual) {
1043 case FB_VISUAL_TRUECOLOR:
1044 /*
1045 * 16-bit True Colour. We encode the RGB value
1046 * according to the RGB bitfield information.
1047 */
1048 if (regno < 16) {
1049 u32 *pal = fbi->pseudo_palette;
1050
1051 val = chan_to_field(red, &fbi->var.red);
1052 val |= chan_to_field(green, &fbi->var.green);
1053 val |= chan_to_field(blue, &fbi->var.blue);
1054
1055 pal[regno] = val;
1056
1057 ret = 0;
1058 }
1059 break;
1060
1061 case FB_VISUAL_STATIC_PSEUDOCOLOR:
1062 case FB_VISUAL_PSEUDOCOLOR:
1063 break;
1064 }
1065 mutex_unlock(&mx3_fbi->mutex);
1066
1067 return ret;
1068 }
1069
__blank(int blank,struct fb_info * fbi)1070 static void __blank(int blank, struct fb_info *fbi)
1071 {
1072 struct mx3fb_info *mx3_fbi = fbi->par;
1073 struct mx3fb_data *mx3fb = mx3_fbi->mx3fb;
1074 int was_blank = mx3_fbi->blank;
1075
1076 mx3_fbi->blank = blank;
1077
1078 /* Attention!
1079 * Do not call sdc_disable_channel() for a channel that is disabled
1080 * already! This will result in a kernel NULL pointer dereference
1081 * (mx3_fbi->txd is NULL). Hide the fact, that all blank modes are
1082 * handled equally by this driver.
1083 */
1084 if (blank > FB_BLANK_UNBLANK && was_blank > FB_BLANK_UNBLANK)
1085 return;
1086
1087 switch (blank) {
1088 case FB_BLANK_POWERDOWN:
1089 case FB_BLANK_VSYNC_SUSPEND:
1090 case FB_BLANK_HSYNC_SUSPEND:
1091 case FB_BLANK_NORMAL:
1092 sdc_set_brightness(mx3fb, 0);
1093 memset((char *)fbi->screen_base, 0, fbi->fix.smem_len);
1094 /* Give LCD time to update - enough for 50 and 60 Hz */
1095 msleep(25);
1096 sdc_disable_channel(mx3_fbi);
1097 break;
1098 case FB_BLANK_UNBLANK:
1099 sdc_enable_channel(mx3_fbi);
1100 sdc_set_brightness(mx3fb, mx3fb->backlight_level);
1101 break;
1102 }
1103 }
1104
1105 /**
1106 * mx3fb_blank() - blank the display.
1107 * @blank: blank value for the panel
1108 * @fbi: framebuffer information pointer
1109 */
mx3fb_blank(int blank,struct fb_info * fbi)1110 static int mx3fb_blank(int blank, struct fb_info *fbi)
1111 {
1112 struct mx3fb_info *mx3_fbi = fbi->par;
1113
1114 dev_dbg(fbi->device, "%s, blank = %d, base %p, len %u\n", __func__,
1115 blank, fbi->screen_base, fbi->fix.smem_len);
1116
1117 if (mx3_fbi->blank == blank)
1118 return 0;
1119
1120 mutex_lock(&mx3_fbi->mutex);
1121 __blank(blank, fbi);
1122 mutex_unlock(&mx3_fbi->mutex);
1123
1124 return 0;
1125 }
1126
1127 /**
1128 * mx3fb_pan_display() - pan or wrap the display
1129 * @var: variable screen buffer information.
1130 * @fbi: framebuffer information pointer.
1131 *
1132 * We look only at xoffset, yoffset and the FB_VMODE_YWRAP flag
1133 */
mx3fb_pan_display(struct fb_var_screeninfo * var,struct fb_info * fbi)1134 static int mx3fb_pan_display(struct fb_var_screeninfo *var,
1135 struct fb_info *fbi)
1136 {
1137 struct mx3fb_info *mx3_fbi = fbi->par;
1138 u32 y_bottom;
1139 unsigned long base;
1140 off_t offset;
1141 dma_cookie_t cookie;
1142 struct scatterlist *sg = mx3_fbi->sg;
1143 struct dma_chan *dma_chan = &mx3_fbi->idmac_channel->dma_chan;
1144 struct dma_async_tx_descriptor *txd;
1145 int ret;
1146
1147 dev_dbg(fbi->device, "%s [%c]\n", __func__,
1148 list_empty(&mx3_fbi->idmac_channel->queue) ? '-' : '+');
1149
1150 if (var->xoffset > 0) {
1151 dev_dbg(fbi->device, "x panning not supported\n");
1152 return -EINVAL;
1153 }
1154
1155 if (mx3_fbi->cur_var.xoffset == var->xoffset &&
1156 mx3_fbi->cur_var.yoffset == var->yoffset)
1157 return 0; /* No change, do nothing */
1158
1159 y_bottom = var->yoffset;
1160
1161 if (!(var->vmode & FB_VMODE_YWRAP))
1162 y_bottom += fbi->var.yres;
1163
1164 if (y_bottom > fbi->var.yres_virtual)
1165 return -EINVAL;
1166
1167 mutex_lock(&mx3_fbi->mutex);
1168
1169 offset = var->yoffset * fbi->fix.line_length
1170 + var->xoffset * (fbi->var.bits_per_pixel / 8);
1171 base = fbi->fix.smem_start + offset;
1172
1173 dev_dbg(fbi->device, "Updating SDC BG buf %d address=0x%08lX\n",
1174 mx3_fbi->cur_ipu_buf, base);
1175
1176 /*
1177 * We enable the End of Frame interrupt, which will free a tx-descriptor,
1178 * which we will need for the next dmaengine_prep_slave_sg(). The
1179 * IRQ-handler will disable the IRQ again.
1180 */
1181 init_completion(&mx3_fbi->flip_cmpl);
1182 enable_irq(mx3_fbi->idmac_channel->eof_irq);
1183
1184 ret = wait_for_completion_timeout(&mx3_fbi->flip_cmpl, HZ / 10);
1185 if (ret <= 0) {
1186 mutex_unlock(&mx3_fbi->mutex);
1187 dev_info(fbi->device, "Panning failed due to %s\n", ret < 0 ?
1188 "user interrupt" : "timeout");
1189 disable_irq(mx3_fbi->idmac_channel->eof_irq);
1190 return ret ? : -ETIMEDOUT;
1191 }
1192
1193 mx3_fbi->cur_ipu_buf = !mx3_fbi->cur_ipu_buf;
1194
1195 sg_dma_address(&sg[mx3_fbi->cur_ipu_buf]) = base;
1196 sg_set_page(&sg[mx3_fbi->cur_ipu_buf],
1197 virt_to_page(fbi->screen_base + offset), fbi->fix.smem_len,
1198 offset_in_page(fbi->screen_base + offset));
1199
1200 if (mx3_fbi->txd)
1201 async_tx_ack(mx3_fbi->txd);
1202
1203 txd = dmaengine_prep_slave_sg(dma_chan, sg +
1204 mx3_fbi->cur_ipu_buf, 1, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
1205 if (!txd) {
1206 dev_err(fbi->device,
1207 "Error preparing a DMA transaction descriptor.\n");
1208 mutex_unlock(&mx3_fbi->mutex);
1209 return -EIO;
1210 }
1211
1212 txd->callback_param = txd;
1213 txd->callback = mx3fb_dma_done;
1214
1215 /*
1216 * Emulate original mx3fb behaviour: each new call to idmac_tx_submit()
1217 * should switch to another buffer
1218 */
1219 cookie = txd->tx_submit(txd);
1220 dev_dbg(fbi->device, "%d: Submit %p #%d\n", __LINE__, txd, cookie);
1221 if (cookie < 0) {
1222 dev_err(fbi->device,
1223 "Error updating SDC buf %d to address=0x%08lX\n",
1224 mx3_fbi->cur_ipu_buf, base);
1225 mutex_unlock(&mx3_fbi->mutex);
1226 return -EIO;
1227 }
1228
1229 mx3_fbi->txd = txd;
1230
1231 fbi->var.xoffset = var->xoffset;
1232 fbi->var.yoffset = var->yoffset;
1233
1234 if (var->vmode & FB_VMODE_YWRAP)
1235 fbi->var.vmode |= FB_VMODE_YWRAP;
1236 else
1237 fbi->var.vmode &= ~FB_VMODE_YWRAP;
1238
1239 mx3_fbi->cur_var = fbi->var;
1240
1241 mutex_unlock(&mx3_fbi->mutex);
1242
1243 dev_dbg(fbi->device, "Update complete\n");
1244
1245 return 0;
1246 }
1247
1248 /*
1249 * This structure contains the pointers to the control functions that are
1250 * invoked by the core framebuffer driver to perform operations like
1251 * blitting, rectangle filling, copy regions and cursor definition.
1252 */
1253 static const struct fb_ops mx3fb_ops = {
1254 .owner = THIS_MODULE,
1255 .fb_set_par = mx3fb_set_par,
1256 .fb_check_var = mx3fb_check_var,
1257 .fb_setcolreg = mx3fb_setcolreg,
1258 .fb_pan_display = mx3fb_pan_display,
1259 .fb_fillrect = cfb_fillrect,
1260 .fb_copyarea = cfb_copyarea,
1261 .fb_imageblit = cfb_imageblit,
1262 .fb_blank = mx3fb_blank,
1263 };
1264
1265 #ifdef CONFIG_PM
1266 /*
1267 * Power management hooks. Note that we won't be called from IRQ context,
1268 * unlike the blank functions above, so we may sleep.
1269 */
1270
1271 /*
1272 * Suspends the framebuffer and blanks the screen. Power management support
1273 */
mx3fb_suspend(struct platform_device * pdev,pm_message_t state)1274 static int mx3fb_suspend(struct platform_device *pdev, pm_message_t state)
1275 {
1276 struct mx3fb_data *mx3fb = platform_get_drvdata(pdev);
1277 struct mx3fb_info *mx3_fbi = mx3fb->fbi->par;
1278
1279 console_lock();
1280 fb_set_suspend(mx3fb->fbi, 1);
1281 console_unlock();
1282
1283 if (mx3_fbi->blank == FB_BLANK_UNBLANK) {
1284 sdc_disable_channel(mx3_fbi);
1285 sdc_set_brightness(mx3fb, 0);
1286
1287 }
1288 return 0;
1289 }
1290
1291 /*
1292 * Resumes the framebuffer and unblanks the screen. Power management support
1293 */
mx3fb_resume(struct platform_device * pdev)1294 static int mx3fb_resume(struct platform_device *pdev)
1295 {
1296 struct mx3fb_data *mx3fb = platform_get_drvdata(pdev);
1297 struct mx3fb_info *mx3_fbi = mx3fb->fbi->par;
1298
1299 if (mx3_fbi->blank == FB_BLANK_UNBLANK) {
1300 sdc_enable_channel(mx3_fbi);
1301 sdc_set_brightness(mx3fb, mx3fb->backlight_level);
1302 }
1303
1304 console_lock();
1305 fb_set_suspend(mx3fb->fbi, 0);
1306 console_unlock();
1307
1308 return 0;
1309 }
1310 #else
1311 #define mx3fb_suspend NULL
1312 #define mx3fb_resume NULL
1313 #endif
1314
1315 /*
1316 * Main framebuffer functions
1317 */
1318
1319 /**
1320 * mx3fb_map_video_memory() - allocates the DRAM memory for the frame buffer.
1321 * @fbi: framebuffer information pointer
1322 * @mem_len: length of mapped memory
1323 * @lock: do not lock during initialisation
1324 * @return: Error code indicating success or failure
1325 *
1326 * This buffer is remapped into a non-cached, non-buffered, memory region to
1327 * allow palette and pixel writes to occur without flushing the cache. Once this
1328 * area is remapped, all virtual memory access to the video memory should occur
1329 * at the new region.
1330 */
mx3fb_map_video_memory(struct fb_info * fbi,unsigned int mem_len,bool lock)1331 static int mx3fb_map_video_memory(struct fb_info *fbi, unsigned int mem_len,
1332 bool lock)
1333 {
1334 int retval = 0;
1335 dma_addr_t addr;
1336
1337 fbi->screen_base = dma_alloc_wc(fbi->device, mem_len, &addr,
1338 GFP_DMA | GFP_KERNEL);
1339
1340 if (!fbi->screen_base) {
1341 dev_err(fbi->device, "Cannot allocate %u bytes framebuffer memory\n",
1342 mem_len);
1343 retval = -EBUSY;
1344 goto err0;
1345 }
1346
1347 if (lock)
1348 mutex_lock(&fbi->mm_lock);
1349 fbi->fix.smem_start = addr;
1350 fbi->fix.smem_len = mem_len;
1351 if (lock)
1352 mutex_unlock(&fbi->mm_lock);
1353
1354 dev_dbg(fbi->device, "allocated fb @ p=0x%08x, v=0x%p, size=%d.\n",
1355 (uint32_t) fbi->fix.smem_start, fbi->screen_base, fbi->fix.smem_len);
1356
1357 fbi->screen_size = fbi->fix.smem_len;
1358
1359 /* Clear the screen */
1360 memset((char *)fbi->screen_base, 0, fbi->fix.smem_len);
1361
1362 return 0;
1363
1364 err0:
1365 fbi->fix.smem_len = 0;
1366 fbi->fix.smem_start = 0;
1367 fbi->screen_base = NULL;
1368 return retval;
1369 }
1370
1371 /**
1372 * mx3fb_unmap_video_memory() - de-allocate frame buffer memory.
1373 * @fbi: framebuffer information pointer
1374 * @return: error code indicating success or failure
1375 */
mx3fb_unmap_video_memory(struct fb_info * fbi)1376 static int mx3fb_unmap_video_memory(struct fb_info *fbi)
1377 {
1378 dma_free_wc(fbi->device, fbi->fix.smem_len, fbi->screen_base,
1379 fbi->fix.smem_start);
1380
1381 fbi->screen_base = NULL;
1382 mutex_lock(&fbi->mm_lock);
1383 fbi->fix.smem_start = 0;
1384 fbi->fix.smem_len = 0;
1385 mutex_unlock(&fbi->mm_lock);
1386 return 0;
1387 }
1388
1389 /**
1390 * mx3fb_init_fbinfo() - initialize framebuffer information object.
1391 * @dev: the device
1392 * @ops: framebuffer device operations
1393 * @return: initialized framebuffer structure.
1394 */
mx3fb_init_fbinfo(struct device * dev,const struct fb_ops * ops)1395 static struct fb_info *mx3fb_init_fbinfo(struct device *dev,
1396 const struct fb_ops *ops)
1397 {
1398 struct fb_info *fbi;
1399 struct mx3fb_info *mx3fbi;
1400 int ret;
1401
1402 /* Allocate sufficient memory for the fb structure */
1403 fbi = framebuffer_alloc(sizeof(struct mx3fb_info), dev);
1404 if (!fbi)
1405 return NULL;
1406
1407 mx3fbi = fbi->par;
1408 mx3fbi->cookie = -EINVAL;
1409 mx3fbi->cur_ipu_buf = 0;
1410
1411 fbi->var.activate = FB_ACTIVATE_NOW;
1412
1413 fbi->fbops = ops;
1414 fbi->flags = FBINFO_FLAG_DEFAULT;
1415 fbi->pseudo_palette = mx3fbi->pseudo_palette;
1416
1417 mutex_init(&mx3fbi->mutex);
1418
1419 /* Allocate colormap */
1420 ret = fb_alloc_cmap(&fbi->cmap, 16, 0);
1421 if (ret < 0) {
1422 framebuffer_release(fbi);
1423 return NULL;
1424 }
1425
1426 return fbi;
1427 }
1428
init_fb_chan(struct mx3fb_data * mx3fb,struct idmac_channel * ichan)1429 static int init_fb_chan(struct mx3fb_data *mx3fb, struct idmac_channel *ichan)
1430 {
1431 struct device *dev = mx3fb->dev;
1432 struct mx3fb_platform_data *mx3fb_pdata = dev_get_platdata(dev);
1433 const char *name = mx3fb_pdata->name;
1434 struct fb_info *fbi;
1435 struct mx3fb_info *mx3fbi;
1436 const struct fb_videomode *mode;
1437 int ret, num_modes;
1438
1439 if (mx3fb_pdata->disp_data_fmt >= ARRAY_SIZE(di_mappings)) {
1440 dev_err(dev, "Illegal display data format %d\n",
1441 mx3fb_pdata->disp_data_fmt);
1442 return -EINVAL;
1443 }
1444
1445 ichan->client = mx3fb;
1446
1447 if (ichan->dma_chan.chan_id != IDMAC_SDC_0)
1448 return -EINVAL;
1449
1450 fbi = mx3fb_init_fbinfo(dev, &mx3fb_ops);
1451 if (!fbi)
1452 return -ENOMEM;
1453
1454 if (!fb_mode)
1455 fb_mode = name;
1456
1457 if (!fb_mode) {
1458 ret = -EINVAL;
1459 goto emode;
1460 }
1461
1462 if (mx3fb_pdata->mode && mx3fb_pdata->num_modes) {
1463 mode = mx3fb_pdata->mode;
1464 num_modes = mx3fb_pdata->num_modes;
1465 } else {
1466 mode = mx3fb_modedb;
1467 num_modes = ARRAY_SIZE(mx3fb_modedb);
1468 }
1469
1470 if (!fb_find_mode(&fbi->var, fbi, fb_mode, mode,
1471 num_modes, NULL, default_bpp)) {
1472 ret = -EBUSY;
1473 goto emode;
1474 }
1475
1476 fb_videomode_to_modelist(mode, num_modes, &fbi->modelist);
1477
1478 /* Default Y virtual size is 2x panel size */
1479 fbi->var.yres_virtual = fbi->var.yres * 2;
1480
1481 mx3fb->fbi = fbi;
1482
1483 /* set Display Interface clock period */
1484 mx3fb_write_reg(mx3fb, 0x00100010L, DI_HSP_CLK_PER);
1485 /* Might need to trigger HSP clock change - see 44.3.3.8.5 */
1486
1487 sdc_set_brightness(mx3fb, 255);
1488 sdc_set_global_alpha(mx3fb, true, 0xFF);
1489 sdc_set_color_key(mx3fb, IDMAC_SDC_0, false, 0);
1490
1491 mx3fbi = fbi->par;
1492 mx3fbi->idmac_channel = ichan;
1493 mx3fbi->ipu_ch = ichan->dma_chan.chan_id;
1494 mx3fbi->mx3fb = mx3fb;
1495 mx3fbi->blank = FB_BLANK_NORMAL;
1496
1497 mx3fb->disp_data_fmt = mx3fb_pdata->disp_data_fmt;
1498
1499 init_completion(&mx3fbi->flip_cmpl);
1500 disable_irq(ichan->eof_irq);
1501 dev_dbg(mx3fb->dev, "disabling irq %d\n", ichan->eof_irq);
1502 ret = __set_par(fbi, false);
1503 if (ret < 0)
1504 goto esetpar;
1505
1506 __blank(FB_BLANK_UNBLANK, fbi);
1507
1508 dev_info(dev, "registered, using mode %s\n", fb_mode);
1509
1510 ret = register_framebuffer(fbi);
1511 if (ret < 0)
1512 goto erfb;
1513
1514 return 0;
1515
1516 erfb:
1517 esetpar:
1518 emode:
1519 fb_dealloc_cmap(&fbi->cmap);
1520 framebuffer_release(fbi);
1521
1522 return ret;
1523 }
1524
chan_filter(struct dma_chan * chan,void * arg)1525 static bool chan_filter(struct dma_chan *chan, void *arg)
1526 {
1527 struct dma_chan_request *rq = arg;
1528 struct device *dev;
1529 struct mx3fb_platform_data *mx3fb_pdata;
1530
1531 if (!imx_dma_is_ipu(chan))
1532 return false;
1533
1534 if (!rq)
1535 return false;
1536
1537 dev = rq->mx3fb->dev;
1538 mx3fb_pdata = dev_get_platdata(dev);
1539
1540 return rq->id == chan->chan_id &&
1541 mx3fb_pdata->dma_dev == chan->device->dev;
1542 }
1543
release_fbi(struct fb_info * fbi)1544 static void release_fbi(struct fb_info *fbi)
1545 {
1546 mx3fb_unmap_video_memory(fbi);
1547
1548 fb_dealloc_cmap(&fbi->cmap);
1549
1550 unregister_framebuffer(fbi);
1551 framebuffer_release(fbi);
1552 }
1553
mx3fb_probe(struct platform_device * pdev)1554 static int mx3fb_probe(struct platform_device *pdev)
1555 {
1556 struct device *dev = &pdev->dev;
1557 int ret;
1558 struct resource *sdc_reg;
1559 struct mx3fb_data *mx3fb;
1560 dma_cap_mask_t mask;
1561 struct dma_chan *chan;
1562 struct dma_chan_request rq;
1563
1564 /*
1565 * Display Interface (DI) and Synchronous Display Controller (SDC)
1566 * registers
1567 */
1568 sdc_reg = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1569 if (!sdc_reg)
1570 return -EINVAL;
1571
1572 mx3fb = devm_kzalloc(&pdev->dev, sizeof(*mx3fb), GFP_KERNEL);
1573 if (!mx3fb)
1574 return -ENOMEM;
1575
1576 spin_lock_init(&mx3fb->lock);
1577
1578 mx3fb->reg_base = ioremap(sdc_reg->start, resource_size(sdc_reg));
1579 if (!mx3fb->reg_base) {
1580 ret = -ENOMEM;
1581 goto eremap;
1582 }
1583
1584 pr_debug("Remapped %pR at %p\n", sdc_reg, mx3fb->reg_base);
1585
1586 /* IDMAC interface */
1587 dmaengine_get();
1588
1589 mx3fb->dev = dev;
1590 platform_set_drvdata(pdev, mx3fb);
1591
1592 rq.mx3fb = mx3fb;
1593
1594 dma_cap_zero(mask);
1595 dma_cap_set(DMA_SLAVE, mask);
1596 dma_cap_set(DMA_PRIVATE, mask);
1597 rq.id = IDMAC_SDC_0;
1598 chan = dma_request_channel(mask, chan_filter, &rq);
1599 if (!chan) {
1600 ret = -EBUSY;
1601 goto ersdc0;
1602 }
1603
1604 mx3fb->backlight_level = 255;
1605
1606 ret = init_fb_chan(mx3fb, to_idmac_chan(chan));
1607 if (ret < 0)
1608 goto eisdc0;
1609
1610 mx3fb_init_backlight(mx3fb);
1611
1612 return 0;
1613
1614 eisdc0:
1615 dma_release_channel(chan);
1616 ersdc0:
1617 dmaengine_put();
1618 iounmap(mx3fb->reg_base);
1619 eremap:
1620 dev_err(dev, "mx3fb: failed to register fb\n");
1621 return ret;
1622 }
1623
mx3fb_remove(struct platform_device * dev)1624 static int mx3fb_remove(struct platform_device *dev)
1625 {
1626 struct mx3fb_data *mx3fb = platform_get_drvdata(dev);
1627 struct fb_info *fbi = mx3fb->fbi;
1628 struct mx3fb_info *mx3_fbi = fbi->par;
1629 struct dma_chan *chan;
1630
1631 chan = &mx3_fbi->idmac_channel->dma_chan;
1632 release_fbi(fbi);
1633
1634 mx3fb_exit_backlight(mx3fb);
1635
1636 dma_release_channel(chan);
1637 dmaengine_put();
1638
1639 iounmap(mx3fb->reg_base);
1640 return 0;
1641 }
1642
1643 static struct platform_driver mx3fb_driver = {
1644 .driver = {
1645 .name = MX3FB_NAME,
1646 },
1647 .probe = mx3fb_probe,
1648 .remove = mx3fb_remove,
1649 .suspend = mx3fb_suspend,
1650 .resume = mx3fb_resume,
1651 };
1652
1653 /*
1654 * Parse user specified options (`video=mx3fb:')
1655 * example:
1656 * video=mx3fb:bpp=16
1657 */
mx3fb_setup(void)1658 static int __init mx3fb_setup(void)
1659 {
1660 #ifndef MODULE
1661 char *opt, *options = NULL;
1662
1663 if (fb_get_options("mx3fb", &options))
1664 return -ENODEV;
1665
1666 if (!options || !*options)
1667 return 0;
1668
1669 while ((opt = strsep(&options, ",")) != NULL) {
1670 if (!*opt)
1671 continue;
1672 if (!strncmp(opt, "bpp=", 4))
1673 default_bpp = simple_strtoul(opt + 4, NULL, 0);
1674 else
1675 fb_mode = opt;
1676 }
1677 #endif
1678
1679 return 0;
1680 }
1681
mx3fb_init(void)1682 static int __init mx3fb_init(void)
1683 {
1684 int ret = mx3fb_setup();
1685
1686 if (ret < 0)
1687 return ret;
1688
1689 ret = platform_driver_register(&mx3fb_driver);
1690 return ret;
1691 }
1692
mx3fb_exit(void)1693 static void __exit mx3fb_exit(void)
1694 {
1695 platform_driver_unregister(&mx3fb_driver);
1696 }
1697
1698 module_init(mx3fb_init);
1699 module_exit(mx3fb_exit);
1700
1701 MODULE_AUTHOR("Freescale Semiconductor, Inc.");
1702 MODULE_DESCRIPTION("MX3 framebuffer driver");
1703 MODULE_ALIAS("platform:" MX3FB_NAME);
1704 MODULE_LICENSE("GPL v2");
1705
