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1 | /* linux/drivers/video/s3c-fb.c |
2 | * | |
3 | * Copyright 2008 Openmoko Inc. | |
4 | * Copyright 2008 Simtec Electronics | |
5 | * Ben Dooks <ben@simtec.co.uk> | |
6 | * http://armlinux.simtec.co.uk/ | |
7 | * | |
8 | * Samsung SoC Framebuffer driver | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | */ | |
14 | ||
15 | #include <linux/kernel.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/platform_device.h> | |
18 | #include <linux/dma-mapping.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/gfp.h> | |
21 | #include <linux/clk.h> | |
22 | #include <linux/fb.h> | |
23 | #include <linux/io.h> | |
24 | ||
25 | #include <mach/map.h> | |
26 | #include <mach/regs-fb.h> | |
27 | #include <plat/fb.h> | |
28 | ||
29 | /* This driver will export a number of framebuffer interfaces depending | |
30 | * on the configuration passed in via the platform data. Each fb instance | |
31 | * maps to a hardware window. Currently there is no support for runtime | |
32 | * setting of the alpha-blending functions that each window has, so only | |
33 | * window 0 is actually useful. | |
34 | * | |
35 | * Window 0 is treated specially, it is used for the basis of the LCD | |
36 | * output timings and as the control for the output power-down state. | |
37 | */ | |
38 | ||
39 | /* note, some of the functions that get called are derived from including | |
40 | * <mach/regs-fb.h> as they are specific to the architecture that the code | |
41 | * is being built for. | |
42 | */ | |
43 | ||
44 | #ifdef CONFIG_FB_S3C_DEBUG_REGWRITE | |
45 | #undef writel | |
46 | #define writel(v, r) do { \ | |
47 | printk(KERN_DEBUG "%s: %08x => %p\n", __func__, (unsigned int)v, r); \ | |
48 | __raw_writel(v, r); } while(0) | |
49 | #endif /* FB_S3C_DEBUG_REGWRITE */ | |
50 | ||
51 | struct s3c_fb; | |
52 | ||
53 | /** | |
54 | * struct s3c_fb_win - per window private data for each framebuffer. | |
55 | * @windata: The platform data supplied for the window configuration. | |
56 | * @parent: The hardware that this window is part of. | |
57 | * @fbinfo: Pointer pack to the framebuffer info for this window. | |
58 | * @palette_buffer: Buffer/cache to hold palette entries. | |
59 | * @pseudo_palette: For use in TRUECOLOUR modes for entries 0..15/ | |
60 | * @index: The window number of this window. | |
61 | * @palette: The bitfields for changing r/g/b into a hardware palette entry. | |
62 | */ | |
63 | struct s3c_fb_win { | |
64 | struct s3c_fb_pd_win *windata; | |
65 | struct s3c_fb *parent; | |
66 | struct fb_info *fbinfo; | |
67 | struct s3c_fb_palette palette; | |
68 | ||
69 | u32 *palette_buffer; | |
70 | u32 pseudo_palette[16]; | |
71 | unsigned int index; | |
72 | }; | |
73 | ||
74 | /** | |
75 | * struct s3c_fb - overall hardware state of the hardware | |
76 | * @dev: The device that we bound to, for printing, etc. | |
77 | * @regs_res: The resource we claimed for the IO registers. | |
78 | * @bus_clk: The clk (hclk) feeding our interface and possibly pixclk. | |
79 | * @regs: The mapped hardware registers. | |
80 | * @enabled: A bitmask of enabled hardware windows. | |
81 | * @pdata: The platform configuration data passed with the device. | |
82 | * @windows: The hardware windows that have been claimed. | |
83 | */ | |
84 | struct s3c_fb { | |
85 | struct device *dev; | |
86 | struct resource *regs_res; | |
87 | struct clk *bus_clk; | |
88 | void __iomem *regs; | |
89 | ||
90 | unsigned char enabled; | |
91 | ||
92 | struct s3c_fb_platdata *pdata; | |
93 | struct s3c_fb_win *windows[S3C_FB_MAX_WIN]; | |
94 | }; | |
95 | ||
96 | /** | |
97 | * s3c_fb_win_has_palette() - determine if a mode has a palette | |
98 | * @win: The window number being queried. | |
99 | * @bpp: The number of bits per pixel to test. | |
100 | * | |
101 | * Work out if the given window supports palletised data at the specified bpp. | |
102 | */ | |
103 | static int s3c_fb_win_has_palette(unsigned int win, unsigned int bpp) | |
104 | { | |
105 | return s3c_fb_win_pal_size(win) <= (1 << bpp); | |
106 | } | |
107 | ||
108 | /** | |
109 | * s3c_fb_check_var() - framebuffer layer request to verify a given mode. | |
110 | * @var: The screen information to verify. | |
111 | * @info: The framebuffer device. | |
112 | * | |
113 | * Framebuffer layer call to verify the given information and allow us to | |
114 | * update various information depending on the hardware capabilities. | |
115 | */ | |
116 | static int s3c_fb_check_var(struct fb_var_screeninfo *var, | |
117 | struct fb_info *info) | |
118 | { | |
119 | struct s3c_fb_win *win = info->par; | |
120 | struct s3c_fb_pd_win *windata = win->windata; | |
121 | struct s3c_fb *sfb = win->parent; | |
122 | ||
123 | dev_dbg(sfb->dev, "checking parameters\n"); | |
124 | ||
125 | var->xres_virtual = max((unsigned int)windata->virtual_x, var->xres); | |
126 | var->yres_virtual = max((unsigned int)windata->virtual_y, var->yres); | |
127 | ||
128 | if (!s3c_fb_validate_win_bpp(win->index, var->bits_per_pixel)) { | |
129 | dev_dbg(sfb->dev, "win %d: unsupported bpp %d\n", | |
130 | win->index, var->bits_per_pixel); | |
131 | return -EINVAL; | |
132 | } | |
133 | ||
134 | /* always ensure these are zero, for drop through cases below */ | |
135 | var->transp.offset = 0; | |
136 | var->transp.length = 0; | |
137 | ||
138 | switch (var->bits_per_pixel) { | |
139 | case 1: | |
140 | case 2: | |
141 | case 4: | |
142 | case 8: | |
143 | if (!s3c_fb_win_has_palette(win->index, var->bits_per_pixel)) { | |
144 | /* non palletised, A:1,R:2,G:3,B:2 mode */ | |
145 | var->red.offset = 4; | |
146 | var->green.offset = 2; | |
147 | var->blue.offset = 0; | |
148 | var->red.length = 5; | |
149 | var->green.length = 3; | |
150 | var->blue.length = 2; | |
151 | var->transp.offset = 7; | |
152 | var->transp.length = 1; | |
153 | } else { | |
154 | var->red.offset = 0; | |
155 | var->red.length = var->bits_per_pixel; | |
156 | var->green = var->red; | |
157 | var->blue = var->red; | |
158 | } | |
159 | break; | |
160 | ||
161 | case 19: | |
162 | /* 666 with one bit alpha/transparency */ | |
163 | var->transp.offset = 18; | |
164 | var->transp.length = 1; | |
165 | case 18: | |
166 | var->bits_per_pixel = 32; | |
167 | ||
168 | /* 666 format */ | |
169 | var->red.offset = 12; | |
170 | var->green.offset = 6; | |
171 | var->blue.offset = 0; | |
172 | var->red.length = 6; | |
173 | var->green.length = 6; | |
174 | var->blue.length = 6; | |
175 | break; | |
176 | ||
177 | case 16: | |
178 | /* 16 bpp, 565 format */ | |
179 | var->red.offset = 11; | |
180 | var->green.offset = 5; | |
181 | var->blue.offset = 0; | |
182 | var->red.length = 5; | |
183 | var->green.length = 6; | |
184 | var->blue.length = 5; | |
185 | break; | |
186 | ||
187 | case 28: | |
188 | case 25: | |
189 | var->transp.length = var->bits_per_pixel - 24; | |
190 | var->transp.offset = 24; | |
191 | /* drop through */ | |
192 | case 24: | |
193 | /* our 24bpp is unpacked, so 32bpp */ | |
194 | var->bits_per_pixel = 32; | |
195 | case 32: | |
196 | var->red.offset = 16; | |
197 | var->red.length = 8; | |
198 | var->green.offset = 8; | |
199 | var->green.length = 8; | |
200 | var->blue.offset = 0; | |
201 | var->blue.length = 8; | |
202 | break; | |
203 | ||
204 | default: | |
205 | dev_err(sfb->dev, "invalid bpp\n"); | |
206 | } | |
207 | ||
208 | dev_dbg(sfb->dev, "%s: verified parameters\n", __func__); | |
209 | return 0; | |
210 | } | |
211 | ||
212 | /** | |
213 | * s3c_fb_calc_pixclk() - calculate the divider to create the pixel clock. | |
214 | * @sfb: The hardware state. | |
215 | * @pixclock: The pixel clock wanted, in picoseconds. | |
216 | * | |
217 | * Given the specified pixel clock, work out the necessary divider to get | |
218 | * close to the output frequency. | |
219 | */ | |
220 | static int s3c_fb_calc_pixclk(struct s3c_fb *sfb, unsigned int pixclk) | |
221 | { | |
222 | unsigned long clk = clk_get_rate(sfb->bus_clk); | |
223 | unsigned long long tmp; | |
224 | unsigned int result; | |
225 | ||
226 | tmp = (unsigned long long)clk; | |
227 | tmp *= pixclk; | |
228 | ||
229 | do_div(tmp, 1000000000UL); | |
230 | result = (unsigned int)tmp / 1000; | |
231 | ||
232 | dev_dbg(sfb->dev, "pixclk=%u, clk=%lu, div=%d (%lu)\n", | |
233 | pixclk, clk, result, clk / result); | |
234 | ||
235 | return result; | |
236 | } | |
237 | ||
238 | /** | |
239 | * s3c_fb_align_word() - align pixel count to word boundary | |
240 | * @bpp: The number of bits per pixel | |
241 | * @pix: The value to be aligned. | |
242 | * | |
243 | * Align the given pixel count so that it will start on an 32bit word | |
244 | * boundary. | |
245 | */ | |
246 | static int s3c_fb_align_word(unsigned int bpp, unsigned int pix) | |
247 | { | |
248 | int pix_per_word; | |
249 | ||
250 | if (bpp > 16) | |
251 | return pix; | |
252 | ||
253 | pix_per_word = (8 * 32) / bpp; | |
254 | return ALIGN(pix, pix_per_word); | |
255 | } | |
256 | ||
257 | /** | |
258 | * s3c_fb_set_par() - framebuffer request to set new framebuffer state. | |
259 | * @info: The framebuffer to change. | |
260 | * | |
261 | * Framebuffer layer request to set a new mode for the specified framebuffer | |
262 | */ | |
263 | static int s3c_fb_set_par(struct fb_info *info) | |
264 | { | |
265 | struct fb_var_screeninfo *var = &info->var; | |
266 | struct s3c_fb_win *win = info->par; | |
267 | struct s3c_fb *sfb = win->parent; | |
268 | void __iomem *regs = sfb->regs; | |
269 | int win_no = win->index; | |
270 | u32 data; | |
271 | u32 pagewidth; | |
272 | int clkdiv; | |
273 | ||
274 | dev_dbg(sfb->dev, "setting framebuffer parameters\n"); | |
275 | ||
276 | switch (var->bits_per_pixel) { | |
277 | case 32: | |
278 | case 24: | |
279 | case 16: | |
280 | case 12: | |
281 | info->fix.visual = FB_VISUAL_TRUECOLOR; | |
282 | break; | |
283 | case 8: | |
284 | if (s3c_fb_win_has_palette(win_no, 8)) | |
285 | info->fix.visual = FB_VISUAL_PSEUDOCOLOR; | |
286 | else | |
287 | info->fix.visual = FB_VISUAL_TRUECOLOR; | |
288 | break; | |
289 | case 1: | |
290 | info->fix.visual = FB_VISUAL_MONO01; | |
291 | break; | |
292 | default: | |
293 | info->fix.visual = FB_VISUAL_PSEUDOCOLOR; | |
294 | break; | |
295 | } | |
296 | ||
297 | info->fix.line_length = (var->xres_virtual * var->bits_per_pixel) / 8; | |
298 | ||
299 | /* disable the window whilst we update it */ | |
300 | writel(0, regs + WINCON(win_no)); | |
301 | ||
302 | /* use window 0 as the basis for the lcd output timings */ | |
303 | ||
304 | if (win_no == 0) { | |
305 | clkdiv = s3c_fb_calc_pixclk(sfb, var->pixclock); | |
306 | ||
307 | data = sfb->pdata->vidcon0; | |
308 | data &= ~(VIDCON0_CLKVAL_F_MASK | VIDCON0_CLKDIR); | |
309 | ||
310 | if (clkdiv > 1) | |
311 | data |= VIDCON0_CLKVAL_F(clkdiv-1) | VIDCON0_CLKDIR; | |
312 | else | |
313 | data &= ~VIDCON0_CLKDIR; /* 1:1 clock */ | |
314 | ||
315 | /* write the timing data to the panel */ | |
316 | ||
317 | data |= VIDCON0_ENVID | VIDCON0_ENVID_F; | |
318 | writel(data, regs + VIDCON0); | |
319 | ||
320 | data = VIDTCON0_VBPD(var->upper_margin - 1) | | |
321 | VIDTCON0_VFPD(var->lower_margin - 1) | | |
322 | VIDTCON0_VSPW(var->vsync_len - 1); | |
323 | ||
324 | writel(data, regs + VIDTCON0); | |
325 | ||
326 | data = VIDTCON1_HBPD(var->left_margin - 1) | | |
327 | VIDTCON1_HFPD(var->right_margin - 1) | | |
328 | VIDTCON1_HSPW(var->hsync_len - 1); | |
329 | ||
330 | writel(data, regs + VIDTCON1); | |
331 | ||
332 | data = VIDTCON2_LINEVAL(var->yres - 1) | | |
333 | VIDTCON2_HOZVAL(var->xres - 1); | |
334 | writel(data, regs + VIDTCON2); | |
335 | } | |
336 | ||
337 | /* write the buffer address */ | |
338 | ||
339 | writel(info->fix.smem_start, regs + VIDW_BUF_START(win_no)); | |
340 | ||
341 | data = info->fix.smem_start + info->fix.line_length * var->yres; | |
342 | writel(data, regs + VIDW_BUF_END(win_no)); | |
343 | ||
344 | pagewidth = (var->xres * var->bits_per_pixel) >> 3; | |
345 | data = VIDW_BUF_SIZE_OFFSET(info->fix.line_length - pagewidth) | | |
346 | VIDW_BUF_SIZE_PAGEWIDTH(pagewidth); | |
347 | writel(data, regs + VIDW_BUF_SIZE(win_no)); | |
348 | ||
349 | /* write 'OSD' registers to control position of framebuffer */ | |
350 | ||
351 | data = VIDOSDxA_TOPLEFT_X(0) | VIDOSDxA_TOPLEFT_Y(0); | |
352 | writel(data, regs + VIDOSD_A(win_no)); | |
353 | ||
354 | data = VIDOSDxB_BOTRIGHT_X(s3c_fb_align_word(var->bits_per_pixel, | |
355 | var->xres - 1)) | | |
356 | VIDOSDxB_BOTRIGHT_Y(var->yres - 1); | |
357 | ||
358 | writel(data, regs + VIDOSD_B(win_no)); | |
359 | ||
360 | data = var->xres * var->yres; | |
361 | if (s3c_fb_has_osd_d(win_no)) { | |
362 | writel(data, regs + VIDOSD_D(win_no)); | |
363 | writel(0, regs + VIDOSD_C(win_no)); | |
364 | } else | |
365 | writel(data, regs + VIDOSD_C(win_no)); | |
366 | ||
367 | data = WINCONx_ENWIN; | |
368 | ||
369 | /* note, since we have to round up the bits-per-pixel, we end up | |
370 | * relying on the bitfield information for r/g/b/a to work out | |
371 | * exactly which mode of operation is intended. */ | |
372 | ||
373 | switch (var->bits_per_pixel) { | |
374 | case 1: | |
375 | data |= WINCON0_BPPMODE_1BPP; | |
376 | data |= WINCONx_BITSWP; | |
377 | data |= WINCONx_BURSTLEN_4WORD; | |
378 | break; | |
379 | case 2: | |
380 | data |= WINCON0_BPPMODE_2BPP; | |
381 | data |= WINCONx_BITSWP; | |
382 | data |= WINCONx_BURSTLEN_8WORD; | |
383 | break; | |
384 | case 4: | |
385 | data |= WINCON0_BPPMODE_4BPP; | |
386 | data |= WINCONx_BITSWP; | |
387 | data |= WINCONx_BURSTLEN_8WORD; | |
388 | break; | |
389 | case 8: | |
390 | if (var->transp.length != 0) | |
391 | data |= WINCON1_BPPMODE_8BPP_1232; | |
392 | else | |
393 | data |= WINCON0_BPPMODE_8BPP_PALETTE; | |
394 | data |= WINCONx_BURSTLEN_8WORD; | |
395 | data |= WINCONx_BYTSWP; | |
396 | break; | |
397 | case 16: | |
398 | if (var->transp.length != 0) | |
399 | data |= WINCON1_BPPMODE_16BPP_A1555; | |
400 | else | |
401 | data |= WINCON0_BPPMODE_16BPP_565; | |
402 | data |= WINCONx_HAWSWP; | |
403 | data |= WINCONx_BURSTLEN_16WORD; | |
404 | break; | |
405 | case 24: | |
406 | case 32: | |
407 | if (var->red.length == 6) { | |
408 | if (var->transp.length != 0) | |
409 | data |= WINCON1_BPPMODE_19BPP_A1666; | |
410 | else | |
411 | data |= WINCON1_BPPMODE_18BPP_666; | |
412 | } else if (var->transp.length != 0) | |
413 | data |= WINCON1_BPPMODE_25BPP_A1888; | |
414 | else | |
415 | data |= WINCON0_BPPMODE_24BPP_888; | |
416 | ||
417 | data |= WINCONx_BURSTLEN_16WORD; | |
418 | break; | |
419 | } | |
420 | ||
421 | writel(data, regs + WINCON(win_no)); | |
422 | writel(0x0, regs + WINxMAP(win_no)); | |
423 | ||
424 | return 0; | |
425 | } | |
426 | ||
427 | /** | |
428 | * s3c_fb_update_palette() - set or schedule a palette update. | |
429 | * @sfb: The hardware information. | |
430 | * @win: The window being updated. | |
431 | * @reg: The palette index being changed. | |
432 | * @value: The computed palette value. | |
433 | * | |
434 | * Change the value of a palette register, either by directly writing to | |
435 | * the palette (this requires the palette RAM to be disconnected from the | |
436 | * hardware whilst this is in progress) or schedule the update for later. | |
437 | * | |
438 | * At the moment, since we have no VSYNC interrupt support, we simply set | |
439 | * the palette entry directly. | |
440 | */ | |
441 | static void s3c_fb_update_palette(struct s3c_fb *sfb, | |
442 | struct s3c_fb_win *win, | |
443 | unsigned int reg, | |
444 | u32 value) | |
445 | { | |
446 | void __iomem *palreg; | |
447 | u32 palcon; | |
448 | ||
449 | palreg = sfb->regs + s3c_fb_pal_reg(win->index, reg); | |
450 | ||
451 | dev_dbg(sfb->dev, "%s: win %d, reg %d (%p): %08x\n", | |
452 | __func__, win->index, reg, palreg, value); | |
453 | ||
454 | win->palette_buffer[reg] = value; | |
455 | ||
456 | palcon = readl(sfb->regs + WPALCON); | |
457 | writel(palcon | WPALCON_PAL_UPDATE, sfb->regs + WPALCON); | |
458 | ||
459 | if (s3c_fb_pal_is16(win->index)) | |
460 | writew(value, palreg); | |
461 | else | |
462 | writel(value, palreg); | |
463 | ||
464 | writel(palcon, sfb->regs + WPALCON); | |
465 | } | |
466 | ||
467 | static inline unsigned int chan_to_field(unsigned int chan, | |
468 | struct fb_bitfield *bf) | |
469 | { | |
470 | chan &= 0xffff; | |
471 | chan >>= 16 - bf->length; | |
472 | return chan << bf->offset; | |
473 | } | |
474 | ||
475 | /** | |
476 | * s3c_fb_setcolreg() - framebuffer layer request to change palette. | |
477 | * @regno: The palette index to change. | |
478 | * @red: The red field for the palette data. | |
479 | * @green: The green field for the palette data. | |
480 | * @blue: The blue field for the palette data. | |
481 | * @trans: The transparency (alpha) field for the palette data. | |
482 | * @info: The framebuffer being changed. | |
483 | */ | |
484 | static int s3c_fb_setcolreg(unsigned regno, | |
485 | unsigned red, unsigned green, unsigned blue, | |
486 | unsigned transp, struct fb_info *info) | |
487 | { | |
488 | struct s3c_fb_win *win = info->par; | |
489 | struct s3c_fb *sfb = win->parent; | |
490 | unsigned int val; | |
491 | ||
492 | dev_dbg(sfb->dev, "%s: win %d: %d => rgb=%d/%d/%d\n", | |
493 | __func__, win->index, regno, red, green, blue); | |
494 | ||
495 | switch (info->fix.visual) { | |
496 | case FB_VISUAL_TRUECOLOR: | |
497 | /* true-colour, use pseudo-palette */ | |
498 | ||
499 | if (regno < 16) { | |
500 | u32 *pal = info->pseudo_palette; | |
501 | ||
502 | val = chan_to_field(red, &info->var.red); | |
503 | val |= chan_to_field(green, &info->var.green); | |
504 | val |= chan_to_field(blue, &info->var.blue); | |
505 | ||
506 | pal[regno] = val; | |
507 | } | |
508 | break; | |
509 | ||
510 | case FB_VISUAL_PSEUDOCOLOR: | |
511 | if (regno < s3c_fb_win_pal_size(win->index)) { | |
512 | val = chan_to_field(red, &win->palette.r); | |
513 | val |= chan_to_field(green, &win->palette.g); | |
514 | val |= chan_to_field(blue, &win->palette.b); | |
515 | ||
516 | s3c_fb_update_palette(sfb, win, regno, val); | |
517 | } | |
518 | ||
519 | break; | |
520 | ||
521 | default: | |
522 | return 1; /* unknown type */ | |
523 | } | |
524 | ||
525 | return 0; | |
526 | } | |
527 | ||
528 | /** | |
529 | * s3c_fb_enable() - Set the state of the main LCD output | |
530 | * @sfb: The main framebuffer state. | |
531 | * @enable: The state to set. | |
532 | */ | |
533 | static void s3c_fb_enable(struct s3c_fb *sfb, int enable) | |
534 | { | |
535 | u32 vidcon0 = readl(sfb->regs + VIDCON0); | |
536 | ||
537 | if (enable) | |
538 | vidcon0 |= VIDCON0_ENVID | VIDCON0_ENVID_F; | |
539 | else { | |
540 | /* see the note in the framebuffer datasheet about | |
541 | * why you cannot take both of these bits down at the | |
542 | * same time. */ | |
543 | ||
544 | if (!(vidcon0 & VIDCON0_ENVID)) | |
545 | return; | |
546 | ||
547 | vidcon0 |= VIDCON0_ENVID; | |
548 | vidcon0 &= ~VIDCON0_ENVID_F; | |
549 | } | |
550 | ||
551 | writel(vidcon0, sfb->regs + VIDCON0); | |
552 | } | |
553 | ||
554 | /** | |
555 | * s3c_fb_blank() - blank or unblank the given window | |
556 | * @blank_mode: The blank state from FB_BLANK_* | |
557 | * @info: The framebuffer to blank. | |
558 | * | |
559 | * Framebuffer layer request to change the power state. | |
560 | */ | |
561 | static int s3c_fb_blank(int blank_mode, struct fb_info *info) | |
562 | { | |
563 | struct s3c_fb_win *win = info->par; | |
564 | struct s3c_fb *sfb = win->parent; | |
565 | unsigned int index = win->index; | |
566 | u32 wincon; | |
567 | ||
568 | dev_dbg(sfb->dev, "blank mode %d\n", blank_mode); | |
569 | ||
570 | wincon = readl(sfb->regs + WINCON(index)); | |
571 | ||
572 | switch (blank_mode) { | |
573 | case FB_BLANK_POWERDOWN: | |
574 | wincon &= ~WINCONx_ENWIN; | |
575 | sfb->enabled &= ~(1 << index); | |
576 | /* fall through to FB_BLANK_NORMAL */ | |
577 | ||
578 | case FB_BLANK_NORMAL: | |
579 | /* disable the DMA and display 0x0 (black) */ | |
580 | writel(WINxMAP_MAP | WINxMAP_MAP_COLOUR(0x0), | |
581 | sfb->regs + WINxMAP(index)); | |
582 | break; | |
583 | ||
584 | case FB_BLANK_UNBLANK: | |
585 | writel(0x0, sfb->regs + WINxMAP(index)); | |
586 | wincon |= WINCONx_ENWIN; | |
587 | sfb->enabled |= (1 << index); | |
588 | break; | |
589 | ||
590 | case FB_BLANK_VSYNC_SUSPEND: | |
591 | case FB_BLANK_HSYNC_SUSPEND: | |
592 | default: | |
593 | return 1; | |
594 | } | |
595 | ||
596 | writel(wincon, sfb->regs + WINCON(index)); | |
597 | ||
598 | /* Check the enabled state to see if we need to be running the | |
599 | * main LCD interface, as if there are no active windows then | |
600 | * it is highly likely that we also do not need to output | |
601 | * anything. | |
602 | */ | |
603 | ||
604 | /* We could do something like the following code, but the current | |
605 | * system of using framebuffer events means that we cannot make | |
606 | * the distinction between just window 0 being inactive and all | |
607 | * the windows being down. | |
608 | * | |
609 | * s3c_fb_enable(sfb, sfb->enabled ? 1 : 0); | |
610 | */ | |
611 | ||
612 | /* we're stuck with this until we can do something about overriding | |
613 | * the power control using the blanking event for a single fb. | |
614 | */ | |
615 | if (index == 0) | |
616 | s3c_fb_enable(sfb, blank_mode != FB_BLANK_POWERDOWN ? 1 : 0); | |
617 | ||
618 | return 0; | |
619 | } | |
620 | ||
621 | static struct fb_ops s3c_fb_ops = { | |
622 | .owner = THIS_MODULE, | |
623 | .fb_check_var = s3c_fb_check_var, | |
624 | .fb_set_par = s3c_fb_set_par, | |
625 | .fb_blank = s3c_fb_blank, | |
626 | .fb_setcolreg = s3c_fb_setcolreg, | |
627 | .fb_fillrect = cfb_fillrect, | |
628 | .fb_copyarea = cfb_copyarea, | |
629 | .fb_imageblit = cfb_imageblit, | |
630 | }; | |
631 | ||
632 | /** | |
633 | * s3c_fb_alloc_memory() - allocate display memory for framebuffer window | |
634 | * @sfb: The base resources for the hardware. | |
635 | * @win: The window to initialise memory for. | |
636 | * | |
637 | * Allocate memory for the given framebuffer. | |
638 | */ | |
639 | static int __devinit s3c_fb_alloc_memory(struct s3c_fb *sfb, | |
640 | struct s3c_fb_win *win) | |
641 | { | |
642 | struct s3c_fb_pd_win *windata = win->windata; | |
643 | unsigned int real_size, virt_size, size; | |
644 | struct fb_info *fbi = win->fbinfo; | |
645 | dma_addr_t map_dma; | |
646 | ||
647 | dev_dbg(sfb->dev, "allocating memory for display\n"); | |
648 | ||
649 | real_size = windata->win_mode.xres * windata->win_mode.yres; | |
650 | virt_size = windata->virtual_x * windata->virtual_y; | |
651 | ||
652 | dev_dbg(sfb->dev, "real_size=%u (%u.%u), virt_size=%u (%u.%u)\n", | |
653 | real_size, windata->win_mode.xres, windata->win_mode.yres, | |
654 | virt_size, windata->virtual_x, windata->virtual_y); | |
655 | ||
656 | size = (real_size > virt_size) ? real_size : virt_size; | |
657 | size *= (windata->max_bpp > 16) ? 32 : windata->max_bpp; | |
658 | size /= 8; | |
659 | ||
660 | fbi->fix.smem_len = size; | |
661 | size = PAGE_ALIGN(size); | |
662 | ||
663 | dev_dbg(sfb->dev, "want %u bytes for window\n", size); | |
664 | ||
665 | fbi->screen_base = dma_alloc_writecombine(sfb->dev, size, | |
666 | &map_dma, GFP_KERNEL); | |
667 | if (!fbi->screen_base) | |
668 | return -ENOMEM; | |
669 | ||
670 | dev_dbg(sfb->dev, "mapped %x to %p\n", | |
671 | (unsigned int)map_dma, fbi->screen_base); | |
672 | ||
673 | memset(fbi->screen_base, 0x0, size); | |
674 | fbi->fix.smem_start = map_dma; | |
675 | ||
676 | return 0; | |
677 | } | |
678 | ||
679 | /** | |
680 | * s3c_fb_free_memory() - free the display memory for the given window | |
681 | * @sfb: The base resources for the hardware. | |
682 | * @win: The window to free the display memory for. | |
683 | * | |
684 | * Free the display memory allocated by s3c_fb_alloc_memory(). | |
685 | */ | |
686 | static void s3c_fb_free_memory(struct s3c_fb *sfb, struct s3c_fb_win *win) | |
687 | { | |
688 | struct fb_info *fbi = win->fbinfo; | |
689 | ||
690 | dma_free_writecombine(sfb->dev, PAGE_ALIGN(fbi->fix.smem_len), | |
691 | fbi->screen_base, fbi->fix.smem_start); | |
692 | } | |
693 | ||
694 | /** | |
695 | * s3c_fb_release_win() - release resources for a framebuffer window. | |
696 | * @win: The window to cleanup the resources for. | |
697 | * | |
698 | * Release the resources that where claimed for the hardware window, | |
699 | * such as the framebuffer instance and any memory claimed for it. | |
700 | */ | |
701 | static void s3c_fb_release_win(struct s3c_fb *sfb, struct s3c_fb_win *win) | |
702 | { | |
703 | fb_dealloc_cmap(&win->fbinfo->cmap); | |
704 | unregister_framebuffer(win->fbinfo); | |
705 | s3c_fb_free_memory(sfb, win); | |
706 | } | |
707 | ||
708 | /** | |
709 | * s3c_fb_probe_win() - register an hardware window | |
710 | * @sfb: The base resources for the hardware | |
711 | * @res: Pointer to where to place the resultant window. | |
712 | * | |
713 | * Allocate and do the basic initialisation for one of the hardware's graphics | |
714 | * windows. | |
715 | */ | |
716 | static int __devinit s3c_fb_probe_win(struct s3c_fb *sfb, unsigned int win_no, | |
717 | struct s3c_fb_win **res) | |
718 | { | |
719 | struct fb_var_screeninfo *var; | |
720 | struct fb_videomode *initmode; | |
721 | struct s3c_fb_pd_win *windata; | |
722 | struct s3c_fb_win *win; | |
723 | struct fb_info *fbinfo; | |
724 | int palette_size; | |
725 | int ret; | |
726 | ||
727 | dev_dbg(sfb->dev, "probing window %d\n", win_no); | |
728 | ||
729 | palette_size = s3c_fb_win_pal_size(win_no); | |
730 | ||
731 | fbinfo = framebuffer_alloc(sizeof(struct s3c_fb_win) + | |
732 | palette_size * sizeof(u32), sfb->dev); | |
733 | if (!fbinfo) { | |
734 | dev_err(sfb->dev, "failed to allocate framebuffer\n"); | |
735 | return -ENOENT; | |
736 | } | |
737 | ||
738 | windata = sfb->pdata->win[win_no]; | |
739 | initmode = &windata->win_mode; | |
740 | ||
741 | WARN_ON(windata->max_bpp == 0); | |
742 | WARN_ON(windata->win_mode.xres == 0); | |
743 | WARN_ON(windata->win_mode.yres == 0); | |
744 | ||
745 | win = fbinfo->par; | |
746 | var = &fbinfo->var; | |
747 | win->fbinfo = fbinfo; | |
748 | win->parent = sfb; | |
749 | win->windata = windata; | |
750 | win->index = win_no; | |
751 | win->palette_buffer = (u32 *)(win + 1); | |
752 | ||
753 | ret = s3c_fb_alloc_memory(sfb, win); | |
754 | if (ret) { | |
755 | dev_err(sfb->dev, "failed to allocate display memory\n"); | |
756 | goto err_framebuffer; | |
757 | } | |
758 | ||
759 | /* setup the r/b/g positions for the window's palette */ | |
760 | s3c_fb_init_palette(win_no, &win->palette); | |
761 | ||
762 | /* setup the initial video mode from the window */ | |
763 | fb_videomode_to_var(&fbinfo->var, initmode); | |
764 | ||
765 | fbinfo->fix.type = FB_TYPE_PACKED_PIXELS; | |
766 | fbinfo->fix.accel = FB_ACCEL_NONE; | |
767 | fbinfo->var.activate = FB_ACTIVATE_NOW; | |
768 | fbinfo->var.vmode = FB_VMODE_NONINTERLACED; | |
769 | fbinfo->var.bits_per_pixel = windata->default_bpp; | |
770 | fbinfo->fbops = &s3c_fb_ops; | |
771 | fbinfo->flags = FBINFO_FLAG_DEFAULT; | |
772 | fbinfo->pseudo_palette = &win->pseudo_palette; | |
773 | ||
774 | /* prepare to actually start the framebuffer */ | |
775 | ||
776 | ret = s3c_fb_check_var(&fbinfo->var, fbinfo); | |
777 | if (ret < 0) { | |
778 | dev_err(sfb->dev, "check_var failed on initial video params\n"); | |
779 | goto err_alloc_mem; | |
780 | } | |
781 | ||
782 | /* create initial colour map */ | |
783 | ||
784 | ret = fb_alloc_cmap(&fbinfo->cmap, s3c_fb_win_pal_size(win_no), 1); | |
785 | if (ret == 0) | |
786 | fb_set_cmap(&fbinfo->cmap, fbinfo); | |
787 | else | |
788 | dev_err(sfb->dev, "failed to allocate fb cmap\n"); | |
789 | ||
790 | s3c_fb_set_par(fbinfo); | |
791 | ||
792 | dev_dbg(sfb->dev, "about to register framebuffer\n"); | |
793 | ||
794 | /* run the check_var and set_par on our configuration. */ | |
795 | ||
796 | ret = register_framebuffer(fbinfo); | |
797 | if (ret < 0) { | |
798 | dev_err(sfb->dev, "failed to register framebuffer\n"); | |
799 | goto err_alloc_mem; | |
800 | } | |
801 | ||
802 | *res = win; | |
803 | dev_info(sfb->dev, "window %d: fb %s\n", win_no, fbinfo->fix.id); | |
804 | ||
805 | return 0; | |
806 | ||
807 | err_alloc_mem: | |
808 | s3c_fb_free_memory(sfb, win); | |
809 | ||
810 | err_framebuffer: | |
811 | unregister_framebuffer(fbinfo); | |
812 | return ret; | |
813 | } | |
814 | ||
815 | /** | |
816 | * s3c_fb_clear_win() - clear hardware window registers. | |
817 | * @sfb: The base resources for the hardware. | |
818 | * @win: The window to process. | |
819 | * | |
820 | * Reset the specific window registers to a known state. | |
821 | */ | |
822 | static void s3c_fb_clear_win(struct s3c_fb *sfb, int win) | |
823 | { | |
824 | void __iomem *regs = sfb->regs; | |
825 | ||
826 | writel(0, regs + WINCON(win)); | |
827 | writel(0xffffff, regs + WxKEYCONy(win, 0)); | |
828 | writel(0xffffff, regs + WxKEYCONy(win, 1)); | |
829 | ||
830 | writel(0, regs + VIDOSD_A(win)); | |
831 | writel(0, regs + VIDOSD_B(win)); | |
832 | writel(0, regs + VIDOSD_C(win)); | |
833 | } | |
834 | ||
835 | static int __devinit s3c_fb_probe(struct platform_device *pdev) | |
836 | { | |
837 | struct device *dev = &pdev->dev; | |
838 | struct s3c_fb_platdata *pd; | |
839 | struct s3c_fb *sfb; | |
840 | struct resource *res; | |
841 | int win; | |
842 | int ret = 0; | |
843 | ||
844 | pd = pdev->dev.platform_data; | |
845 | if (!pd) { | |
846 | dev_err(dev, "no platform data specified\n"); | |
847 | return -EINVAL; | |
848 | } | |
849 | ||
850 | sfb = kzalloc(sizeof(struct s3c_fb), GFP_KERNEL); | |
851 | if (!sfb) { | |
852 | dev_err(dev, "no memory for framebuffers\n"); | |
853 | return -ENOMEM; | |
854 | } | |
855 | ||
856 | sfb->dev = dev; | |
857 | sfb->pdata = pd; | |
858 | ||
859 | sfb->bus_clk = clk_get(dev, "lcd"); | |
860 | if (IS_ERR(sfb->bus_clk)) { | |
861 | dev_err(dev, "failed to get bus clock\n"); | |
862 | goto err_sfb; | |
863 | } | |
864 | ||
865 | clk_enable(sfb->bus_clk); | |
866 | ||
867 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
868 | if (!res) { | |
869 | dev_err(dev, "failed to find registers\n"); | |
870 | ret = -ENOENT; | |
871 | goto err_clk; | |
872 | } | |
873 | ||
874 | sfb->regs_res = request_mem_region(res->start, resource_size(res), | |
875 | dev_name(dev)); | |
876 | if (!sfb->regs_res) { | |
877 | dev_err(dev, "failed to claim register region\n"); | |
878 | ret = -ENOENT; | |
879 | goto err_clk; | |
880 | } | |
881 | ||
882 | sfb->regs = ioremap(res->start, resource_size(res)); | |
883 | if (!sfb->regs) { | |
884 | dev_err(dev, "failed to map registers\n"); | |
885 | ret = -ENXIO; | |
886 | goto err_req_region; | |
887 | } | |
888 | ||
889 | dev_dbg(dev, "got resources (regs %p), probing windows\n", sfb->regs); | |
890 | ||
891 | /* setup gpio and output polarity controls */ | |
892 | ||
893 | pd->setup_gpio(); | |
894 | ||
895 | writel(pd->vidcon1, sfb->regs + VIDCON1); | |
896 | ||
897 | /* zero all windows before we do anything */ | |
898 | ||
899 | for (win = 0; win < S3C_FB_MAX_WIN; win++) | |
900 | s3c_fb_clear_win(sfb, win); | |
901 | ||
902 | /* we have the register setup, start allocating framebuffers */ | |
903 | ||
904 | for (win = 0; win < S3C_FB_MAX_WIN; win++) { | |
905 | if (!pd->win[win]) | |
906 | continue; | |
907 | ||
908 | ret = s3c_fb_probe_win(sfb, win, &sfb->windows[win]); | |
909 | if (ret < 0) { | |
910 | dev_err(dev, "failed to create window %d\n", win); | |
911 | for (; win >= 0; win--) | |
912 | s3c_fb_release_win(sfb, sfb->windows[win]); | |
913 | goto err_ioremap; | |
914 | } | |
915 | } | |
916 | ||
917 | platform_set_drvdata(pdev, sfb); | |
918 | ||
919 | return 0; | |
920 | ||
921 | err_ioremap: | |
922 | iounmap(sfb->regs); | |
923 | ||
924 | err_req_region: | |
925 | release_resource(sfb->regs_res); | |
926 | kfree(sfb->regs_res); | |
927 | ||
928 | err_clk: | |
929 | clk_disable(sfb->bus_clk); | |
930 | clk_put(sfb->bus_clk); | |
931 | ||
932 | err_sfb: | |
933 | kfree(sfb); | |
934 | return ret; | |
935 | } | |
936 | ||
937 | /** | |
938 | * s3c_fb_remove() - Cleanup on module finalisation | |
939 | * @pdev: The platform device we are bound to. | |
940 | * | |
941 | * Shutdown and then release all the resources that the driver allocated | |
942 | * on initialisation. | |
943 | */ | |
944 | static int __devexit s3c_fb_remove(struct platform_device *pdev) | |
945 | { | |
946 | struct s3c_fb *sfb = platform_get_drvdata(pdev); | |
947 | int win; | |
948 | ||
949 | for (win = 0; win <= S3C_FB_MAX_WIN; win++) | |
950 | s3c_fb_release_win(sfb, sfb->windows[win]); | |
951 | ||
952 | iounmap(sfb->regs); | |
953 | ||
954 | clk_disable(sfb->bus_clk); | |
955 | clk_put(sfb->bus_clk); | |
956 | ||
957 | release_resource(sfb->regs_res); | |
958 | kfree(sfb->regs_res); | |
959 | ||
960 | kfree(sfb); | |
961 | ||
962 | return 0; | |
963 | } | |
964 | ||
965 | #ifdef CONFIG_PM | |
966 | static int s3c_fb_suspend(struct platform_device *pdev, pm_message_t state) | |
967 | { | |
968 | struct s3c_fb *sfb = platform_get_drvdata(pdev); | |
969 | struct s3c_fb_win *win; | |
970 | int win_no; | |
971 | ||
972 | for (win_no = S3C_FB_MAX_WIN; win_no >= 0; win_no--) { | |
973 | win = sfb->windows[win_no]; | |
974 | if (!win) | |
975 | continue; | |
976 | ||
977 | /* use the blank function to push into power-down */ | |
978 | s3c_fb_blank(FB_BLANK_POWERDOWN, win->fbinfo); | |
979 | } | |
980 | ||
981 | clk_disable(sfb->bus_clk); | |
982 | return 0; | |
983 | } | |
984 | ||
985 | static int s3c_fb_resume(struct platform_device *pdev) | |
986 | { | |
987 | struct s3c_fb *sfb = platform_get_drvdata(pdev); | |
988 | struct s3c_fb_win *win; | |
989 | int win_no; | |
990 | ||
991 | clk_enable(sfb->bus_clk); | |
992 | ||
993 | for (win_no = 0; win_no < S3C_FB_MAX_WIN; win_no++) { | |
994 | win = sfb->windows[win_no]; | |
995 | if (!win) | |
996 | continue; | |
997 | ||
998 | dev_dbg(&pdev->dev, "resuming window %d\n", win_no); | |
999 | s3c_fb_set_par(win->fbinfo); | |
1000 | } | |
1001 | ||
1002 | return 0; | |
1003 | } | |
1004 | #else | |
1005 | #define s3c_fb_suspend NULL | |
1006 | #define s3c_fb_resume NULL | |
1007 | #endif | |
1008 | ||
1009 | static struct platform_driver s3c_fb_driver = { | |
1010 | .probe = s3c_fb_probe, | |
1011 | .remove = s3c_fb_remove, | |
1012 | .suspend = s3c_fb_suspend, | |
1013 | .resume = s3c_fb_resume, | |
1014 | .driver = { | |
1015 | .name = "s3c-fb", | |
1016 | .owner = THIS_MODULE, | |
1017 | }, | |
1018 | }; | |
1019 | ||
1020 | static int __init s3c_fb_init(void) | |
1021 | { | |
1022 | return platform_driver_register(&s3c_fb_driver); | |
1023 | } | |
1024 | ||
1025 | static void __exit s3c_fb_cleanup(void) | |
1026 | { | |
1027 | platform_driver_unregister(&s3c_fb_driver); | |
1028 | } | |
1029 | ||
1030 | module_init(s3c_fb_init); | |
1031 | module_exit(s3c_fb_cleanup); | |
1032 | ||
1033 | MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); | |
1034 | MODULE_DESCRIPTION("Samsung S3C SoC Framebuffer driver"); | |
1035 | MODULE_LICENSE("GPL"); | |
1036 | MODULE_ALIAS("platform:s3c-fb"); |