├── COPYING
├── Makefile
└── vdmafb.c
/COPYING:
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586 | author or copyright holder as a result of your choosing to follow a
587 | later version.
588 |
589 | 15. Disclaimer of Warranty.
590 |
591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
599 |
600 | 16. Limitation of Liability.
601 |
602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
610 | SUCH DAMAGES.
611 |
612 | 17. Interpretation of Sections 15 and 16.
613 |
614 | If the disclaimer of warranty and limitation of liability provided
615 | above cannot be given local legal effect according to their terms,
616 | reviewing courts shall apply local law that most closely approximates
617 | an absolute waiver of all civil liability in connection with the
618 | Program, unless a warranty or assumption of liability accompanies a
619 | copy of the Program in return for a fee.
620 |
621 | END OF TERMS AND CONDITIONS
622 |
--------------------------------------------------------------------------------
/Makefile:
--------------------------------------------------------------------------------
1 | KERNEL_SRC ?= "/lib/modules/$(shell uname -r)/build"
2 |
3 | obj-m += vdmafb.o
4 |
5 | all:
6 | $(MAKE) -C $(KERNEL_SRC) M=$(PWD) modules
7 |
8 | clean:
9 | $(MAKE) -C $(KERNEL_SRC) M=$(PWD) clean
10 | rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versions
11 |
12 | modules_install:
13 | $(MAKE) -C $(KERNEL_SRC) M=$(PWD) modules_install
14 |
15 |
--------------------------------------------------------------------------------
/vdmafb.c:
--------------------------------------------------------------------------------
1 | /*
2 | * AXI VDMA frame buffer driver
3 | * Based on: ocfb.c, simplefb.c, axi_hdmi_crtc.c
4 | *
5 | * Copyright (C) 2014 Topic Embedded Products
6 | * Author: Mike Looijmans
7 | *
8 | * Licensed under the GPL-2.
9 | *
10 | * Example devicetree contents:
11 | axi_vdma_vga: axi_vdma_vga@7e000000 {
12 | compatible = "topic,vdma-fb";
13 | reg = <0x7e000000 0x10000>;
14 | dmas = <&axi_vdma_0 0>;
15 | dma-names = "video";
16 | width = <1024>;
17 | height = <600>;
18 | horizontal-front-porch = <160>;
19 | horizontal-back-porch = <160>;
20 | horizontal-sync = <136>;
21 | vertical-front-porch = <17>;
22 | vertical-back-porch = <18>;
23 | };
24 | */
25 |
26 | #include
27 | #include
28 | #include
29 | #include
30 | #include
31 | #include
32 | #include
33 | #include
34 | #include
35 | #include
36 | #include
37 | #include
38 | #include
39 | #include
40 | #include
41 |
42 | /* Register locations */
43 | #define VDMAFB_CONTROL 0x00
44 |
45 | #define VDMAFB_HORIZONTAL_TOTAL 0x04
46 | #define VDMAFB_HORIZONTAL_WIDTH 0x08
47 | #define VDMAFB_HORIZONTAL_SYNC 0x0C
48 | #define VDMAFB_HORIZONTAL_FRONT_PORCH 0x10
49 | #define VDMAFB_HORIZONTAL_BACK_PORCH 0x14
50 | #define VDMAFB_HORIZONTAL_POLARITY 0x18
51 |
52 | #define VDMAFB_VERTICAL_TOTAL 0x1C
53 | #define VDMAFB_VERTICAL_HEIGHT 0x20
54 | #define VDMAFB_VERTICAL_SYNC 0x24
55 | #define VDMAFB_VERTICAL_FRONT_PORCH 0x28
56 | #define VDMAFB_VERTICAL_BACK_PORCH 0x2C
57 | #define VDMAFB_VERTICAL_POLARITY 0x30
58 |
59 | #define VDMAFB_BACKLIGHT_CONTROL 0x50
60 | #define VDMAFB_BACKLIGHT_LEVEL_1K 0x54
61 |
62 | /* Register control flags */
63 | #define VDMAFB_CONTROL_ENABLE 1
64 |
65 | struct vdmafb_dev {
66 | struct backlight_device *backlight;
67 | struct fb_info info;
68 | void __iomem *regs;
69 | /* Physical and virtual addresses of framebuffer */
70 | phys_addr_t fb_phys;
71 | void __iomem *fb_virt;
72 | /* VDMA handle */
73 | struct dma_chan *dma;
74 | struct dma_interleaved_template *dma_template;
75 | u32 frames;
76 | /* Palette data */
77 | u32 pseudo_palette[16];
78 | };
79 |
80 | static inline u32 vdmafb_readreg(struct vdmafb_dev *fbdev, loff_t offset)
81 | {
82 | return ioread32(fbdev->regs + offset);
83 | }
84 |
85 | static inline void vdmafb_writereg(struct vdmafb_dev *fbdev, loff_t offset, u32 data)
86 | {
87 | iowrite32(data, fbdev->regs + offset);
88 | }
89 |
90 | static int vdmafb_bl_update_status(struct backlight_device *bl)
91 | {
92 | struct vdmafb_dev *fbdev = bl_get_data(bl);
93 | int brightness = bl->props.brightness;
94 | u32 power = 1;
95 |
96 | pr_debug("%s: b=%d p=%d\n",
97 | __func__, brightness, bl->props.power);
98 |
99 | if (bl->props.power != 0)
100 | power = 0;
101 | vdmafb_writereg(fbdev, VDMAFB_BACKLIGHT_CONTROL, power);
102 | vdmafb_writereg(fbdev, VDMAFB_BACKLIGHT_LEVEL_1K, brightness);
103 | return 0;
104 | }
105 |
106 | static int vdmafb_bl_get_brightness(struct backlight_device *bl)
107 | {
108 | struct vdmafb_dev *fbdev = bl_get_data(bl);
109 |
110 | return vdmafb_readreg(fbdev, VDMAFB_BACKLIGHT_LEVEL_1K);
111 | }
112 |
113 | static const struct backlight_ops vdmafb_bl_ops = {
114 | .update_status = vdmafb_bl_update_status,
115 | .get_brightness = vdmafb_bl_get_brightness,
116 | };
117 |
118 | static int vdmafb_setupfb(struct vdmafb_dev *fbdev)
119 | {
120 | struct fb_var_screeninfo *var = &fbdev->info.var;
121 | struct dma_async_tx_descriptor *desc;
122 | struct dma_interleaved_template *dma_template = fbdev->dma_template;
123 | struct xilinx_vdma_config vdma_config;
124 | int hsize = var->xres * 4;
125 | u32 frame;
126 | int ret;
127 |
128 | /* Disable display */
129 | vdmafb_writereg(fbdev, VDMAFB_CONTROL, 0);
130 |
131 | dmaengine_terminate_all(fbdev->dma);
132 |
133 | /* Setup VDMA address etc */
134 | memset(&vdma_config, 0, sizeof(vdma_config));
135 | vdma_config.park = 1;
136 | vdma_config.coalesc = 255; /* Reduces unused interrupts */
137 | xilinx_vdma_channel_set_config(fbdev->dma, &vdma_config);
138 |
139 | /*
140 | * Interleaved DMA:
141 | * Each interleaved frame is a row (hsize) implemented in ONE
142 | * chunk (sgl has len 1).
143 | * The number of interleaved frames is the number of rows (vsize).
144 | * The icg in used to pack data to the HW, so that the buffer len
145 | * is fb->piches[0], but the actual size for the hw is somewhat less
146 | */
147 | dma_template->dir = DMA_MEM_TO_DEV;
148 | dma_template->src_start = fbdev->fb_phys;
149 | /* sgl list have just one entry (each interleaved frame have 1 chunk) */
150 | dma_template->frame_size = 1;
151 | /* the number of interleaved frame, each has the size specified in sgl */
152 | dma_template->numf = var->yres;
153 | dma_template->src_sgl = 1;
154 | dma_template->src_inc = 1;
155 | /* vdma IP does not provide any addr to the hdmi IP */
156 | dma_template->dst_inc = 0;
157 | dma_template->dst_sgl = 0;
158 | /* horizontal size */
159 | dma_template->sgl[0].size = hsize;
160 | /* the vdma driver seems to look at icg, and not src_icg */
161 | dma_template->sgl[0].icg = 0; /* stride - hsize */
162 |
163 | for (frame = 0; frame < fbdev->frames; ++frame) {
164 | desc = dmaengine_prep_interleaved_dma(fbdev->dma, dma_template, 0);
165 | if (!desc) {
166 | pr_err("Failed to prepare DMA descriptor\n");
167 | return -ENOMEM;
168 | }
169 | dmaengine_submit(desc);
170 | }
171 | dma_async_issue_pending(fbdev->dma);
172 |
173 | /* Configure IP via registers */
174 | vdmafb_writereg(fbdev, VDMAFB_HORIZONTAL_TOTAL,
175 | var->hsync_len + var->left_margin + var->xres + var->right_margin);
176 | vdmafb_writereg(fbdev, VDMAFB_HORIZONTAL_SYNC, var->hsync_len);
177 | vdmafb_writereg(fbdev, VDMAFB_HORIZONTAL_FRONT_PORCH, var->left_margin);
178 | vdmafb_writereg(fbdev, VDMAFB_HORIZONTAL_WIDTH, var->xres);
179 | vdmafb_writereg(fbdev, VDMAFB_HORIZONTAL_BACK_PORCH, var->right_margin);
180 | vdmafb_writereg(fbdev, VDMAFB_HORIZONTAL_POLARITY, 0); /* TODO */
181 | vdmafb_writereg(fbdev, VDMAFB_VERTICAL_TOTAL,
182 | var->vsync_len + var->upper_margin + var->yres + var->lower_margin);
183 | vdmafb_writereg(fbdev, VDMAFB_VERTICAL_SYNC, var->vsync_len);
184 | vdmafb_writereg(fbdev, VDMAFB_VERTICAL_FRONT_PORCH, var->upper_margin);
185 | vdmafb_writereg(fbdev, VDMAFB_VERTICAL_HEIGHT, var->yres);
186 | vdmafb_writereg(fbdev, VDMAFB_VERTICAL_BACK_PORCH, var->lower_margin);
187 | vdmafb_writereg(fbdev, VDMAFB_VERTICAL_POLARITY, 0);
188 | /* Enable output */
189 | vdmafb_writereg(fbdev, VDMAFB_CONTROL, VDMAFB_CONTROL_ENABLE);
190 |
191 | /* Set brightness */
192 |
193 | vdmafb_writereg(fbdev, VDMAFB_BACKLIGHT_CONTROL, 1);
194 | vdmafb_writereg(fbdev, VDMAFB_BACKLIGHT_LEVEL_1K, 800);
195 |
196 | return 0;
197 | }
198 |
199 | static void vdmafb_init_fix(struct vdmafb_dev *fbdev)
200 | {
201 | struct fb_var_screeninfo *var = &fbdev->info.var;
202 | struct fb_fix_screeninfo *fix = &fbdev->info.fix;
203 |
204 | strcpy(fix->id, "vdma-fb");
205 | fix->line_length = var->xres * (var->bits_per_pixel/8);
206 | fix->smem_len = fix->line_length * var->yres;
207 | fix->type = FB_TYPE_PACKED_PIXELS;
208 | fix->visual = FB_VISUAL_TRUECOLOR;
209 | }
210 |
211 | static void vdmafb_init_var(struct vdmafb_dev *fbdev, struct platform_device *pdev)
212 | {
213 | struct device_node *np = pdev->dev.of_node;
214 | struct fb_var_screeninfo *var = &fbdev->info.var;
215 | int ret;
216 |
217 | ret = of_property_read_u32(np, "width", &var->xres);
218 | if (ret) {
219 | dev_err(&pdev->dev, "Can't parse width property, assume 1024\n");
220 | var->xres = 1024;
221 | }
222 |
223 | ret = of_property_read_u32(np, "height", &var->yres);
224 | if (ret) {
225 | dev_err(&pdev->dev, "Can't parse height property, assume 768\n");
226 | var->yres = 768;
227 | }
228 |
229 | /*
230 | * Xilinx VDMA requires clients to submit exactly the number of frame
231 | * stores, but doesn't supply a way to retrieve that number. Pass the
232 | * xlnx,num-fstores value of the VDMA node to num-fstores here.
233 | */
234 | ret = of_property_read_u32(np, "num-fstores", &fbdev->frames);
235 | if (ret) {
236 | dev_err(&pdev->dev, "Can't parse num-fstores property, assume 3\n");
237 | fbdev->frames = 3;
238 | }
239 |
240 | var->accel_flags = FB_ACCEL_NONE;
241 | var->activate = FB_ACTIVATE_NOW;
242 | var->xres_virtual = var->xres;
243 | var->yres_virtual = var->yres;
244 | var->bits_per_pixel = 32;
245 | /* Clock settings */
246 | var->pixclock = KHZ2PICOS(51200);
247 | var->vmode = FB_VMODE_NONINTERLACED;
248 | of_property_read_u32(np, "horizontal-sync", &var->hsync_len);
249 | of_property_read_u32(np, "horizontal-front-porch", &var->left_margin);
250 | of_property_read_u32(np, "horizontal-back-porch", &var->right_margin);
251 | of_property_read_u32(np, "vertical-sync", &var->vsync_len);
252 | of_property_read_u32(np, "vertical-front-porch", &var->upper_margin);
253 | of_property_read_u32(np, "vertical-back-porch", &var->lower_margin);
254 | /* TODO: sync */
255 | /* 32 BPP */
256 | var->transp.offset = 24;
257 | var->transp.length = 8;
258 | var->red.offset = 16;
259 | var->red.length = 8;
260 | var->green.offset = 8;
261 | var->green.length = 8;
262 | var->blue.offset = 0;
263 | var->blue.length = 8;
264 | }
265 |
266 | static int vdmafb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
267 | u_int transp, struct fb_info *info)
268 | {
269 | u32 *pal = info->pseudo_palette;
270 | u32 cr = red >> (16 - info->var.red.length);
271 | u32 cg = green >> (16 - info->var.green.length);
272 | u32 cb = blue >> (16 - info->var.blue.length);
273 | u32 value;
274 |
275 | if (regno >= 16)
276 | return -EINVAL;
277 |
278 | value = (cr << info->var.red.offset) |
279 | (cg << info->var.green.offset) |
280 | (cb << info->var.blue.offset);
281 | if (info->var.transp.length > 0) {
282 | u32 mask = (1 << info->var.transp.length) - 1;
283 | mask <<= info->var.transp.offset;
284 | value |= mask;
285 | }
286 | pal[regno] = value;
287 |
288 | return 0;
289 | }
290 |
291 | static struct fb_ops vdmafb_ops = {
292 | .owner = THIS_MODULE,
293 | .fb_setcolreg = vdmafb_setcolreg,
294 | .fb_fillrect = sys_fillrect,
295 | .fb_copyarea = sys_copyarea,
296 | .fb_imageblit = sys_imageblit,
297 | };
298 |
299 | static int vdmafb_probe(struct platform_device *pdev)
300 | {
301 | int ret = 0;
302 | struct vdmafb_dev *fbdev;
303 | struct resource *res;
304 | int fbsize;
305 | struct backlight_properties props;
306 | struct backlight_device *bl;
307 |
308 | fbdev = devm_kzalloc(&pdev->dev, sizeof(*fbdev), GFP_KERNEL);
309 | if (!fbdev)
310 | return -ENOMEM;
311 |
312 | platform_set_drvdata(pdev, fbdev);
313 |
314 | fbdev->info.fbops = &vdmafb_ops;
315 | fbdev->info.device = &pdev->dev;
316 | fbdev->info.par = fbdev;
317 |
318 | fbdev->dma_template = devm_kzalloc(&pdev->dev,
319 | sizeof(struct dma_interleaved_template) +
320 | sizeof(struct data_chunk), GFP_KERNEL);
321 | if (!fbdev->dma_template)
322 | return -ENOMEM;
323 |
324 | vdmafb_init_var(fbdev, pdev);
325 | vdmafb_init_fix(fbdev);
326 |
327 | /* Request I/O resource */
328 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
329 | if (!res) {
330 | dev_err(&pdev->dev, "I/O resource request failed\n");
331 | return -ENXIO;
332 | }
333 | res->flags &= ~IORESOURCE_CACHEABLE;
334 | fbdev->regs = devm_ioremap_resource(&pdev->dev, res);
335 | if (IS_ERR(fbdev->regs))
336 | return PTR_ERR(fbdev->regs);
337 |
338 | /* Allocate framebuffer memory */
339 | fbsize = fbdev->info.fix.smem_len;
340 | fbdev->fb_virt = dma_alloc_coherent(&pdev->dev, PAGE_ALIGN(fbsize),
341 | &fbdev->fb_phys, GFP_KERNEL);
342 | if (!fbdev->fb_virt) {
343 | dev_err(&pdev->dev,
344 | "Frame buffer memory allocation failed\n");
345 | return -ENOMEM;
346 | }
347 | fbdev->info.fix.smem_start = fbdev->fb_phys;
348 | fbdev->info.screen_base = fbdev->fb_virt;
349 | fbdev->info.pseudo_palette = fbdev->pseudo_palette;
350 |
351 | pr_debug("%s virt=%p phys=%x size=%d\n", __func__,
352 | fbdev->fb_virt, fbdev->fb_phys, fbsize);
353 |
354 | /* Clear framebuffer */
355 | memset_io(fbdev->fb_virt, 0, fbsize);
356 |
357 | fbdev->dma = dma_request_slave_channel(&pdev->dev, "video");
358 | if (IS_ERR_OR_NULL(fbdev->dma)) {
359 | dev_err(&pdev->dev, "Failed to allocate DMA channel (%d).\n", ret);
360 | if (fbdev->dma)
361 | ret = PTR_ERR(fbdev->dma);
362 | else
363 | ret = -EPROBE_DEFER;
364 | goto err_dma_free;
365 | }
366 |
367 | /* Setup and enable the framebuffer */
368 | vdmafb_setupfb(fbdev);
369 |
370 | ret = fb_alloc_cmap(&fbdev->info.cmap, 256, 0);
371 | if (ret) {
372 | dev_err(&pdev->dev, "fb_alloc_cmap failed\n");
373 | }
374 |
375 | /* Register framebuffer */
376 | ret = register_framebuffer(&fbdev->info);
377 | if (ret) {
378 | dev_err(&pdev->dev, "Framebuffer registration failed\n");
379 | goto err_channel_free;
380 | }
381 |
382 | /* Register backlight */
383 | memset(&props, 0, sizeof(struct backlight_properties));
384 | props.type = BACKLIGHT_RAW;
385 | props.max_brightness = 1023;
386 | bl = backlight_device_register("backlight", &pdev->dev, fbdev,
387 | &vdmafb_bl_ops, &props);
388 | if (IS_ERR(bl)) {
389 | dev_err(&pdev->dev, "error %ld on backlight register\n",
390 | PTR_ERR(bl));
391 | } else {
392 | fbdev->backlight = bl;
393 | bl->props.power = FB_BLANK_UNBLANK;
394 | bl->props.fb_blank = FB_BLANK_UNBLANK;
395 | bl->props.brightness = vdmafb_bl_get_brightness(bl);
396 | }
397 |
398 | return 0;
399 |
400 | err_channel_free:
401 | dma_release_channel(fbdev->dma);
402 | err_dma_free:
403 | dma_free_coherent(&pdev->dev, PAGE_ALIGN(fbsize), fbdev->fb_virt,
404 | fbdev->fb_phys);
405 |
406 | return ret;
407 | }
408 |
409 | static int vdmafb_remove(struct platform_device *pdev)
410 | {
411 | struct vdmafb_dev *fbdev = platform_get_drvdata(pdev);
412 |
413 | if (fbdev->backlight)
414 | backlight_device_unregister(fbdev->backlight);
415 | unregister_framebuffer(&fbdev->info);
416 | /* Disable display */
417 | vdmafb_writereg(fbdev, VDMAFB_BACKLIGHT_CONTROL, 0);
418 | vdmafb_writereg(fbdev, VDMAFB_CONTROL, 0);
419 | dma_release_channel(fbdev->dma);
420 | dma_free_coherent(&pdev->dev, PAGE_ALIGN(fbdev->info.fix.smem_len),
421 | fbdev->fb_virt, fbdev->fb_phys);
422 | fb_dealloc_cmap(&fbdev->info.cmap);
423 | return 0;
424 | }
425 |
426 | static struct of_device_id vdmafb_match[] = {
427 | { .compatible = "topic,vdma-fb", },
428 | {},
429 | };
430 | MODULE_DEVICE_TABLE(of, vdmafb_match);
431 |
432 | static struct platform_driver vdmafb_driver = {
433 | .probe = vdmafb_probe,
434 | .remove = vdmafb_remove,
435 | .driver = {
436 | .name = "vdmafb_fb",
437 | .of_match_table = vdmafb_match,
438 | }
439 | };
440 | module_platform_driver(vdmafb_driver);
441 |
442 | MODULE_AUTHOR("Mike Looijmans ");
443 | MODULE_DESCRIPTION("Driver for VDMA controlled framebuffer");
444 | MODULE_LICENSE("GPL v2");
445 |
--------------------------------------------------------------------------------