Commit | Line | Data |
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d6ff7d0f AC |
1 | /* |
2 | * linux/drivers/video/vt8500lcdfb.c | |
3 | * | |
4 | * Copyright (C) 2010 Alexey Charkov <alchark@gmail.com> | |
5 | * | |
6 | * Based on skeletonfb.c and pxafb.c | |
7 | * | |
8 | * This software is licensed under the terms of the GNU General Public | |
9 | * License version 2, as published by the Free Software Foundation, and | |
10 | * may be copied, distributed, and modified under those terms. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | */ | |
17 | ||
d6ff7d0f | 18 | #include <linux/delay.h> |
7ab0a484 TP |
19 | #include <linux/dma-mapping.h> |
20 | #include <linux/errno.h> | |
d6ff7d0f AC |
21 | #include <linux/fb.h> |
22 | #include <linux/init.h> | |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/io.h> | |
7ab0a484 TP |
25 | #include <linux/kernel.h> |
26 | #include <linux/mm.h> | |
27 | #include <linux/module.h> | |
d6ff7d0f | 28 | #include <linux/platform_device.h> |
7ab0a484 TP |
29 | #include <linux/slab.h> |
30 | #include <linux/string.h> | |
d6ff7d0f | 31 | #include <linux/wait.h> |
7ab0a484 | 32 | #include <video/of_display_timing.h> |
d6ff7d0f | 33 | |
d6ff7d0f AC |
34 | #include "vt8500lcdfb.h" |
35 | #include "wmt_ge_rops.h" | |
36 | ||
e7b99537 TP |
37 | #ifdef CONFIG_OF |
38 | #include <linux/of.h> | |
39 | #include <linux/of_fdt.h> | |
40 | #include <linux/memblock.h> | |
41 | #endif | |
42 | ||
43 | ||
d6ff7d0f AC |
44 | #define to_vt8500lcd_info(__info) container_of(__info, \ |
45 | struct vt8500lcd_info, fb) | |
46 | ||
47 | static int vt8500lcd_set_par(struct fb_info *info) | |
48 | { | |
49 | struct vt8500lcd_info *fbi = to_vt8500lcd_info(info); | |
50 | int reg_bpp = 5; /* 16bpp */ | |
51 | int i; | |
52 | unsigned long control0; | |
53 | ||
54 | if (!fbi) | |
55 | return -EINVAL; | |
56 | ||
57 | if (info->var.bits_per_pixel <= 8) { | |
58 | /* palettized */ | |
59 | info->var.red.offset = 0; | |
60 | info->var.red.length = info->var.bits_per_pixel; | |
61 | info->var.red.msb_right = 0; | |
62 | ||
63 | info->var.green.offset = 0; | |
64 | info->var.green.length = info->var.bits_per_pixel; | |
65 | info->var.green.msb_right = 0; | |
66 | ||
67 | info->var.blue.offset = 0; | |
68 | info->var.blue.length = info->var.bits_per_pixel; | |
69 | info->var.blue.msb_right = 0; | |
70 | ||
71 | info->var.transp.offset = 0; | |
72 | info->var.transp.length = 0; | |
73 | info->var.transp.msb_right = 0; | |
74 | ||
75 | info->fix.visual = FB_VISUAL_PSEUDOCOLOR; | |
76 | info->fix.line_length = info->var.xres_virtual / | |
77 | (8/info->var.bits_per_pixel); | |
78 | } else { | |
79 | /* non-palettized */ | |
80 | info->var.transp.offset = 0; | |
81 | info->var.transp.length = 0; | |
82 | info->var.transp.msb_right = 0; | |
83 | ||
84 | if (info->var.bits_per_pixel == 16) { | |
85 | /* RGB565 */ | |
86 | info->var.red.offset = 11; | |
87 | info->var.red.length = 5; | |
88 | info->var.red.msb_right = 0; | |
89 | info->var.green.offset = 5; | |
90 | info->var.green.length = 6; | |
91 | info->var.green.msb_right = 0; | |
92 | info->var.blue.offset = 0; | |
93 | info->var.blue.length = 5; | |
94 | info->var.blue.msb_right = 0; | |
95 | } else { | |
96 | /* Equal depths per channel */ | |
97 | info->var.red.offset = info->var.bits_per_pixel | |
98 | * 2 / 3; | |
99 | info->var.red.length = info->var.bits_per_pixel / 3; | |
100 | info->var.red.msb_right = 0; | |
101 | info->var.green.offset = info->var.bits_per_pixel / 3; | |
102 | info->var.green.length = info->var.bits_per_pixel / 3; | |
103 | info->var.green.msb_right = 0; | |
104 | info->var.blue.offset = 0; | |
105 | info->var.blue.length = info->var.bits_per_pixel / 3; | |
106 | info->var.blue.msb_right = 0; | |
107 | } | |
108 | ||
109 | info->fix.visual = FB_VISUAL_TRUECOLOR; | |
110 | info->fix.line_length = info->var.bits_per_pixel > 16 ? | |
111 | info->var.xres_virtual << 2 : | |
112 | info->var.xres_virtual << 1; | |
113 | } | |
114 | ||
115 | for (i = 0; i < 8; i++) { | |
116 | if (bpp_values[i] == info->var.bits_per_pixel) { | |
117 | reg_bpp = i; | |
118 | continue; | |
119 | } | |
120 | } | |
121 | ||
122 | control0 = readl(fbi->regbase) & ~0xf; | |
123 | writel(0, fbi->regbase); | |
124 | while (readl(fbi->regbase + 0x38) & 0x10) | |
125 | /* wait */; | |
126 | writel((((info->var.hsync_len - 1) & 0x3f) << 26) | |
127 | | ((info->var.left_margin & 0xff) << 18) | |
128 | | (((info->var.xres - 1) & 0x3ff) << 8) | |
129 | | (info->var.right_margin & 0xff), fbi->regbase + 0x4); | |
130 | writel((((info->var.vsync_len - 1) & 0x3f) << 26) | |
131 | | ((info->var.upper_margin & 0xff) << 18) | |
132 | | (((info->var.yres - 1) & 0x3ff) << 8) | |
133 | | (info->var.lower_margin & 0xff), fbi->regbase + 0x8); | |
134 | writel((((info->var.yres - 1) & 0x400) << 2) | |
135 | | ((info->var.xres - 1) & 0x400), fbi->regbase + 0x10); | |
136 | writel(0x80000000, fbi->regbase + 0x20); | |
137 | writel(control0 | (reg_bpp << 1) | 0x100, fbi->regbase); | |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
142 | static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf) | |
143 | { | |
144 | chan &= 0xffff; | |
145 | chan >>= 16 - bf->length; | |
146 | return chan << bf->offset; | |
147 | } | |
148 | ||
149 | static int vt8500lcd_setcolreg(unsigned regno, unsigned red, unsigned green, | |
150 | unsigned blue, unsigned transp, | |
151 | struct fb_info *info) { | |
152 | struct vt8500lcd_info *fbi = to_vt8500lcd_info(info); | |
153 | int ret = 1; | |
154 | unsigned int val; | |
155 | if (regno >= 256) | |
156 | return -EINVAL; | |
157 | ||
158 | if (info->var.grayscale) | |
159 | red = green = blue = | |
160 | (19595 * red + 38470 * green + 7471 * blue) >> 16; | |
161 | ||
162 | switch (fbi->fb.fix.visual) { | |
163 | case FB_VISUAL_TRUECOLOR: | |
164 | if (regno < 16) { | |
165 | u32 *pal = fbi->fb.pseudo_palette; | |
166 | ||
167 | val = chan_to_field(red, &fbi->fb.var.red); | |
168 | val |= chan_to_field(green, &fbi->fb.var.green); | |
169 | val |= chan_to_field(blue, &fbi->fb.var.blue); | |
170 | ||
171 | pal[regno] = val; | |
172 | ret = 0; | |
173 | } | |
174 | break; | |
175 | ||
176 | case FB_VISUAL_STATIC_PSEUDOCOLOR: | |
177 | case FB_VISUAL_PSEUDOCOLOR: | |
178 | writew((red & 0xf800) | |
179 | | ((green >> 5) & 0x7e0) | |
180 | | ((blue >> 11) & 0x1f), | |
181 | fbi->palette_cpu + sizeof(u16) * regno); | |
182 | break; | |
183 | } | |
184 | ||
185 | return ret; | |
186 | } | |
187 | ||
188 | static int vt8500lcd_ioctl(struct fb_info *info, unsigned int cmd, | |
189 | unsigned long arg) | |
190 | { | |
191 | int ret = 0; | |
192 | struct vt8500lcd_info *fbi = to_vt8500lcd_info(info); | |
193 | ||
194 | if (cmd == FBIO_WAITFORVSYNC) { | |
195 | /* Unmask End of Frame interrupt */ | |
196 | writel(0xffffffff ^ (1 << 3), fbi->regbase + 0x3c); | |
197 | ret = wait_event_interruptible_timeout(fbi->wait, | |
198 | readl(fbi->regbase + 0x38) & (1 << 3), HZ / 10); | |
199 | /* Mask back to reduce unwanted interrupt traffic */ | |
200 | writel(0xffffffff, fbi->regbase + 0x3c); | |
201 | if (ret < 0) | |
202 | return ret; | |
203 | if (ret == 0) | |
204 | return -ETIMEDOUT; | |
205 | } | |
206 | ||
207 | return ret; | |
208 | } | |
209 | ||
210 | static int vt8500lcd_pan_display(struct fb_var_screeninfo *var, | |
211 | struct fb_info *info) | |
212 | { | |
213 | unsigned pixlen = info->fix.line_length / info->var.xres_virtual; | |
214 | unsigned off = pixlen * var->xoffset | |
215 | + info->fix.line_length * var->yoffset; | |
216 | struct vt8500lcd_info *fbi = to_vt8500lcd_info(info); | |
217 | ||
218 | writel((1 << 31) | |
8f0246d6 LP |
219 | | (((info->var.xres_virtual - info->var.xres) * pixlen / 4) << 20) |
220 | | (off >> 2), fbi->regbase + 0x20); | |
d6ff7d0f AC |
221 | return 0; |
222 | } | |
223 | ||
e41f1a98 AC |
224 | /* |
225 | * vt8500lcd_blank(): | |
226 | * Blank the display by setting all palette values to zero. Note, | |
227 | * True Color modes do not really use the palette, so this will not | |
228 | * blank the display in all modes. | |
229 | */ | |
230 | static int vt8500lcd_blank(int blank, struct fb_info *info) | |
231 | { | |
232 | int i; | |
233 | ||
234 | switch (blank) { | |
235 | case FB_BLANK_POWERDOWN: | |
236 | case FB_BLANK_VSYNC_SUSPEND: | |
237 | case FB_BLANK_HSYNC_SUSPEND: | |
238 | case FB_BLANK_NORMAL: | |
239 | if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR || | |
240 | info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR) | |
241 | for (i = 0; i < 256; i++) | |
242 | vt8500lcd_setcolreg(i, 0, 0, 0, 0, info); | |
243 | case FB_BLANK_UNBLANK: | |
244 | if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR || | |
245 | info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR) | |
246 | fb_set_cmap(&info->cmap, info); | |
247 | } | |
248 | return 0; | |
249 | } | |
250 | ||
d6ff7d0f AC |
251 | static struct fb_ops vt8500lcd_ops = { |
252 | .owner = THIS_MODULE, | |
253 | .fb_set_par = vt8500lcd_set_par, | |
254 | .fb_setcolreg = vt8500lcd_setcolreg, | |
255 | .fb_fillrect = wmt_ge_fillrect, | |
256 | .fb_copyarea = wmt_ge_copyarea, | |
257 | .fb_imageblit = sys_imageblit, | |
258 | .fb_sync = wmt_ge_sync, | |
259 | .fb_ioctl = vt8500lcd_ioctl, | |
260 | .fb_pan_display = vt8500lcd_pan_display, | |
e41f1a98 | 261 | .fb_blank = vt8500lcd_blank, |
d6ff7d0f AC |
262 | }; |
263 | ||
264 | static irqreturn_t vt8500lcd_handle_irq(int irq, void *dev_id) | |
265 | { | |
266 | struct vt8500lcd_info *fbi = dev_id; | |
267 | ||
268 | if (readl(fbi->regbase + 0x38) & (1 << 3)) | |
269 | wake_up_interruptible(&fbi->wait); | |
270 | ||
271 | writel(0xffffffff, fbi->regbase + 0x38); | |
272 | return IRQ_HANDLED; | |
273 | } | |
274 | ||
48c68c4f | 275 | static int vt8500lcd_probe(struct platform_device *pdev) |
d6ff7d0f AC |
276 | { |
277 | struct vt8500lcd_info *fbi; | |
278 | struct resource *res; | |
7ab0a484 | 279 | struct display_timings *disp_timing; |
d6ff7d0f AC |
280 | void *addr; |
281 | int irq, ret; | |
282 | ||
e7b99537 | 283 | struct fb_videomode of_mode; |
e7b99537 TP |
284 | u32 bpp; |
285 | dma_addr_t fb_mem_phys; | |
286 | unsigned long fb_mem_len; | |
287 | void *fb_mem_virt; | |
288 | ||
d6ff7d0f AC |
289 | ret = -ENOMEM; |
290 | fbi = NULL; | |
291 | ||
e7b99537 TP |
292 | fbi = devm_kzalloc(&pdev->dev, sizeof(struct vt8500lcd_info) |
293 | + sizeof(u32) * 16, GFP_KERNEL); | |
d6ff7d0f AC |
294 | if (!fbi) { |
295 | dev_err(&pdev->dev, "Failed to initialize framebuffer device\n"); | |
296 | ret = -ENOMEM; | |
297 | goto failed; | |
298 | } | |
299 | ||
300 | strcpy(fbi->fb.fix.id, "VT8500 LCD"); | |
301 | ||
302 | fbi->fb.fix.type = FB_TYPE_PACKED_PIXELS; | |
303 | fbi->fb.fix.xpanstep = 0; | |
304 | fbi->fb.fix.ypanstep = 1; | |
305 | fbi->fb.fix.ywrapstep = 0; | |
306 | fbi->fb.fix.accel = FB_ACCEL_NONE; | |
307 | ||
308 | fbi->fb.var.nonstd = 0; | |
309 | fbi->fb.var.activate = FB_ACTIVATE_NOW; | |
310 | fbi->fb.var.height = -1; | |
311 | fbi->fb.var.width = -1; | |
312 | fbi->fb.var.vmode = FB_VMODE_NONINTERLACED; | |
313 | ||
314 | fbi->fb.fbops = &vt8500lcd_ops; | |
315 | fbi->fb.flags = FBINFO_DEFAULT | |
316 | | FBINFO_HWACCEL_COPYAREA | |
317 | | FBINFO_HWACCEL_FILLRECT | |
318 | | FBINFO_HWACCEL_YPAN | |
319 | | FBINFO_VIRTFB | |
320 | | FBINFO_PARTIAL_PAN_OK; | |
321 | fbi->fb.node = -1; | |
322 | ||
323 | addr = fbi; | |
324 | addr = addr + sizeof(struct vt8500lcd_info); | |
325 | fbi->fb.pseudo_palette = addr; | |
326 | ||
327 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
328 | if (res == NULL) { | |
329 | dev_err(&pdev->dev, "no I/O memory resource defined\n"); | |
330 | ret = -ENODEV; | |
331 | goto failed_fbi; | |
332 | } | |
333 | ||
334 | res = request_mem_region(res->start, resource_size(res), "vt8500lcd"); | |
335 | if (res == NULL) { | |
336 | dev_err(&pdev->dev, "failed to request I/O memory\n"); | |
337 | ret = -EBUSY; | |
338 | goto failed_fbi; | |
339 | } | |
340 | ||
341 | fbi->regbase = ioremap(res->start, resource_size(res)); | |
342 | if (fbi->regbase == NULL) { | |
343 | dev_err(&pdev->dev, "failed to map I/O memory\n"); | |
344 | ret = -EBUSY; | |
345 | goto failed_free_res; | |
346 | } | |
347 | ||
7ab0a484 TP |
348 | disp_timing = of_get_display_timings(pdev->dev.of_node); |
349 | if (!disp_timing) | |
350 | return -EINVAL; | |
e7b99537 | 351 | |
7ab0a484 TP |
352 | ret = of_get_fb_videomode(pdev->dev.of_node, &of_mode, |
353 | OF_USE_NATIVE_MODE); | |
354 | if (ret) | |
355 | return ret; | |
356 | ||
357 | ret = of_property_read_u32(pdev->dev.of_node, "bits-per-pixel", &bpp); | |
358 | if (ret) | |
359 | return ret; | |
e7b99537 TP |
360 | |
361 | /* try allocating the framebuffer */ | |
362 | fb_mem_len = of_mode.xres * of_mode.yres * 2 * (bpp / 8); | |
363 | fb_mem_virt = dma_alloc_coherent(&pdev->dev, fb_mem_len, &fb_mem_phys, | |
364 | GFP_KERNEL); | |
365 | if (!fb_mem_virt) { | |
366 | pr_err("%s: Failed to allocate framebuffer\n", __func__); | |
367 | return -ENOMEM; | |
368 | }; | |
369 | ||
370 | fbi->fb.fix.smem_start = fb_mem_phys; | |
371 | fbi->fb.fix.smem_len = fb_mem_len; | |
372 | fbi->fb.screen_base = fb_mem_virt; | |
d6ff7d0f AC |
373 | |
374 | fbi->palette_size = PAGE_ALIGN(512); | |
375 | fbi->palette_cpu = dma_alloc_coherent(&pdev->dev, | |
376 | fbi->palette_size, | |
377 | &fbi->palette_phys, | |
378 | GFP_KERNEL); | |
379 | if (fbi->palette_cpu == NULL) { | |
380 | dev_err(&pdev->dev, "Failed to allocate palette buffer\n"); | |
381 | ret = -ENOMEM; | |
382 | goto failed_free_io; | |
383 | } | |
384 | ||
385 | irq = platform_get_irq(pdev, 0); | |
386 | if (irq < 0) { | |
387 | dev_err(&pdev->dev, "no IRQ defined\n"); | |
388 | ret = -ENODEV; | |
389 | goto failed_free_palette; | |
390 | } | |
391 | ||
f8798ccb | 392 | ret = request_irq(irq, vt8500lcd_handle_irq, 0, "LCD", fbi); |
d6ff7d0f AC |
393 | if (ret) { |
394 | dev_err(&pdev->dev, "request_irq failed: %d\n", ret); | |
395 | ret = -EBUSY; | |
396 | goto failed_free_palette; | |
397 | } | |
398 | ||
399 | init_waitqueue_head(&fbi->wait); | |
400 | ||
401 | if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) { | |
402 | dev_err(&pdev->dev, "Failed to allocate color map\n"); | |
403 | ret = -ENOMEM; | |
404 | goto failed_free_irq; | |
405 | } | |
406 | ||
e7b99537 TP |
407 | fb_videomode_to_var(&fbi->fb.var, &of_mode); |
408 | ||
409 | fbi->fb.var.xres_virtual = of_mode.xres; | |
410 | fbi->fb.var.yres_virtual = of_mode.yres * 2; | |
411 | fbi->fb.var.bits_per_pixel = bpp; | |
d6ff7d0f AC |
412 | |
413 | ret = vt8500lcd_set_par(&fbi->fb); | |
414 | if (ret) { | |
415 | dev_err(&pdev->dev, "Failed to set parameters\n"); | |
416 | goto failed_free_cmap; | |
417 | } | |
418 | ||
419 | writel(fbi->fb.fix.smem_start >> 22, fbi->regbase + 0x1c); | |
420 | writel((fbi->palette_phys & 0xfffffe00) | 1, fbi->regbase + 0x18); | |
421 | ||
422 | platform_set_drvdata(pdev, fbi); | |
423 | ||
424 | ret = register_framebuffer(&fbi->fb); | |
425 | if (ret < 0) { | |
426 | dev_err(&pdev->dev, | |
427 | "Failed to register framebuffer device: %d\n", ret); | |
428 | goto failed_free_cmap; | |
429 | } | |
430 | ||
431 | /* | |
432 | * Ok, now enable the LCD controller | |
433 | */ | |
434 | writel(readl(fbi->regbase) | 1, fbi->regbase); | |
435 | ||
436 | return 0; | |
437 | ||
438 | failed_free_cmap: | |
439 | if (fbi->fb.cmap.len) | |
440 | fb_dealloc_cmap(&fbi->fb.cmap); | |
441 | failed_free_irq: | |
442 | free_irq(irq, fbi); | |
443 | failed_free_palette: | |
444 | dma_free_coherent(&pdev->dev, fbi->palette_size, | |
445 | fbi->palette_cpu, fbi->palette_phys); | |
446 | failed_free_io: | |
447 | iounmap(fbi->regbase); | |
448 | failed_free_res: | |
449 | release_mem_region(res->start, resource_size(res)); | |
450 | failed_fbi: | |
d6ff7d0f AC |
451 | kfree(fbi); |
452 | failed: | |
453 | return ret; | |
454 | } | |
455 | ||
48c68c4f | 456 | static int vt8500lcd_remove(struct platform_device *pdev) |
d6ff7d0f AC |
457 | { |
458 | struct vt8500lcd_info *fbi = platform_get_drvdata(pdev); | |
459 | struct resource *res; | |
460 | int irq; | |
461 | ||
462 | unregister_framebuffer(&fbi->fb); | |
463 | ||
464 | writel(0, fbi->regbase); | |
465 | ||
466 | if (fbi->fb.cmap.len) | |
467 | fb_dealloc_cmap(&fbi->fb.cmap); | |
468 | ||
469 | irq = platform_get_irq(pdev, 0); | |
470 | free_irq(irq, fbi); | |
471 | ||
472 | dma_free_coherent(&pdev->dev, fbi->palette_size, | |
473 | fbi->palette_cpu, fbi->palette_phys); | |
474 | ||
475 | iounmap(fbi->regbase); | |
476 | ||
477 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
478 | release_mem_region(res->start, resource_size(res)); | |
479 | ||
480 | kfree(fbi); | |
481 | ||
482 | return 0; | |
483 | } | |
484 | ||
e7b99537 TP |
485 | static const struct of_device_id via_dt_ids[] = { |
486 | { .compatible = "via,vt8500-fb", }, | |
487 | {} | |
488 | }; | |
489 | ||
d6ff7d0f AC |
490 | static struct platform_driver vt8500lcd_driver = { |
491 | .probe = vt8500lcd_probe, | |
48c68c4f | 492 | .remove = vt8500lcd_remove, |
d6ff7d0f AC |
493 | .driver = { |
494 | .owner = THIS_MODULE, | |
495 | .name = "vt8500-lcd", | |
e7b99537 | 496 | .of_match_table = of_match_ptr(via_dt_ids), |
d6ff7d0f AC |
497 | }, |
498 | }; | |
499 | ||
4277f2c4 | 500 | module_platform_driver(vt8500lcd_driver); |
d6ff7d0f AC |
501 | |
502 | MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>"); | |
503 | MODULE_DESCRIPTION("LCD controller driver for VIA VT8500"); | |
e7b99537 TP |
504 | MODULE_LICENSE("GPL v2"); |
505 | MODULE_DEVICE_TABLE(of, via_dt_ids); |