├── COPYING ├── Makefile └── vdmafb.c /COPYING: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. By contrast, 15 | the GNU General Public License is intended to guarantee your freedom to 16 | share and change all versions of a program--to make sure it remains free 17 | software for all its users. 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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 | --------------------------------------------------------------------------------