diff options
Diffstat (limited to 'target/linux/ubicom32/files/drivers/video/ubicom32vfb.c')
| -rw-r--r-- | target/linux/ubicom32/files/drivers/video/ubicom32vfb.c | 603 |
1 files changed, 603 insertions, 0 deletions
diff --git a/target/linux/ubicom32/files/drivers/video/ubicom32vfb.c b/target/linux/ubicom32/files/drivers/video/ubicom32vfb.c new file mode 100644 index 0000000..8478273 --- /dev/null +++ b/target/linux/ubicom32/files/drivers/video/ubicom32vfb.c @@ -0,0 +1,603 @@ +/* + * drivers/video/ubicom32vfb.c + * Ubicom32 virtual frame buffer driver + * + * (C) Copyright 2009, Ubicom, Inc. + * + * This file is part of the Ubicom32 Linux Kernel Port. + * + * The Ubicom32 Linux Kernel Port is free software: you can redistribute + * it and/or modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, either version 2 of the + * License, or (at your option) any later version. + * + * The Ubicom32 Linux Kernel Port is distributed in the hope that it + * will be useful, but WITHOUT ANY WARRANTY; without even the implied + * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See + * the GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with the Ubicom32 Linux Kernel Port. If not, + * see <http://www.gnu.org/licenses/>. + */ + +/* + * This driver was based on skeletonfb.c, Skeleton for a frame buffer device by + * Geert Uytterhoeven. + */ + +#include <linux/device.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/version.h> +#include <linux/errno.h> +#include <linux/string.h> +#include <linux/mm.h> +#include <linux/fb.h> +#include <linux/init.h> +#include <linux/dma-mapping.h> +#include <linux/platform_device.h> +#include <linux/device.h> +#include <linux/uaccess.h> + +#define DRIVER_NAME "ubicom32vfb" +#define DRIVER_DESCRIPTION "Ubicom32 virtual frame buffer driver" + +#define PALETTE_ENTRIES_NO 16 + +/* + * Option variables + * + * vram_size: VRAM size in kilobytes, subject to alignment + */ +static int vram_size = 0; +module_param(vram_size, int, 0); +MODULE_PARM_DESC(vram_size, "VRAM size, in kilobytes to allocate, should be at least the size of one screen, subject to alignment"); + +static int xres = 320; +module_param(xres, int, 0); +MODULE_PARM_DESC(xres, "x (horizontal) resolution"); + +static int yres = 240; +module_param(yres, int, 0); +MODULE_PARM_DESC(yres, "y (vertical) resolution"); + +static int bgr = 0; +module_param(bgr, int, 0); +MODULE_PARM_DESC(bgr, "display is BGR (Blue is MSB)"); + +#define BITS_PER_PIXEL 16 + +/* + * Buffer alignment, must not be 0 + */ +#define UBICOM32VFB_ALIGNMENT 4 + +/* + * fb_fix_screeninfo defines the non-changeable properties of the VDC, depending on what mode it is in. + */ +static struct fb_fix_screeninfo ubicom32vfb_fix = { + .id = "Ubicom32", + .type = FB_TYPE_PACKED_PIXELS, + .visual = FB_VISUAL_TRUECOLOR, + .accel = FB_ACCEL_UBICOM32_VFB, +}; + +/* + * Filled in at probe time when we find out what the hardware supports + */ +static struct fb_var_screeninfo ubicom32vfb_var; + +/* + * Private data structure + */ +struct ubicom32vfb_drvdata { + struct fb_info *fbinfo; + bool cmap_alloc; + + /* + * The address of the framebuffer in memory + */ + void *fb; + void *fb_aligned; + + /* + * Total size of vram including alignment allowance + */ + u32 total_vram_size; + + /* + * Fake palette of 16 colors + */ + u32 pseudo_palette[PALETTE_ENTRIES_NO]; +}; + +static struct platform_device *ubicom32vfb_platform_device; + +/* + * ubicom32vfb_pan_display + * Pans the display to a given location. Supports only y direction panning. + */ +static int ubicom32vfb_pan_display(struct fb_var_screeninfo *var, struct fb_info *fbi) +{ + struct ubicom32vfb_drvdata *ud = (struct ubicom32vfb_drvdata *)fbi->par; + void *new_addr; + + /* + * Get the last y line that would be displayed. Since we don't support YWRAP, + * it must be less than our virtual y size. + */ + u32 lasty = var->yoffset + var->yres; + if (lasty > fbi->var.yres_virtual) { + /* + * We would fall off the end of our frame buffer if we panned here. + */ + return -EINVAL; + } + + if (var->xoffset) { + /* + * We don't support panning in the x direction + */ + return -EINVAL; + } + + /* + * Everything looks sane, go ahead and pan + * + * We have to calculate a new address for the VDC to look at + */ + new_addr = ud->fb_aligned + (var->yoffset * fbi->fix.line_length); + + return 0; +} + +/* + * ubicom32vfb_setcolreg + * Sets a color in our virtual palette + */ +static int ubicom32vfb_setcolreg(unsigned regno, unsigned red, unsigned green, unsigned blue, unsigned transp, struct fb_info *fbi) +{ + u32 *palette = fbi->pseudo_palette; + + if (regno >= PALETTE_ENTRIES_NO) { + return -EINVAL; + } + + /* + * We only use 8 bits from each color + */ + red >>= 8; + green >>= 8; + blue >>= 8; + + /* + * Convert any grayscale values + */ + if (fbi->var.grayscale) { + u16 gray = red + green + blue; + gray += (gray >> 2) + (gray >> 3) - (gray >> 7); + gray >>= 2; + if (gray > 255) { + gray = 255; + } + red = gray; + blue = gray; + green = gray; + } + + palette[regno] = (red << fbi->var.red.offset) | (green << fbi->var.green.offset) | + (blue << fbi->var.blue.offset); + + return 0; +} + +/* + * ubicom32vfb_mmap + */ +static int ubicom32vfb_mmap(struct fb_info *info, struct vm_area_struct *vma) +{ + struct ubicom32vfb_drvdata *ud = (struct ubicom32vfb_drvdata *)info->par; + + vma->vm_start = (unsigned long)(ud->fb_aligned); + + vma->vm_end = vma->vm_start + info->fix.smem_len; + + /* For those who don't understand how mmap works, go read + * Documentation/nommu-mmap.txt. + * For those that do, you will know that the VM_MAYSHARE flag + * must be set in the vma->vm_flags structure on noMMU + * Other flags can be set, and are documented in + * include/linux/mm.h + */ + + vma->vm_flags |= VM_MAYSHARE | VM_SHARED; + + return 0; +} + +/* + * ubicom32vfb_check_var + * Check the var, tweak it but don't change operational parameters. + */ +static int ubicom32vfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) +{ + struct ubicom32vfb_drvdata *ud = (struct ubicom32vfb_drvdata *)info->par; + u32 line_size = var->xres * (BITS_PER_PIXEL / 8); + + /* + * See if we can handle this bpp + */ + if (var->bits_per_pixel > BITS_PER_PIXEL) { + return -EINVAL; + } + var->bits_per_pixel = BITS_PER_PIXEL; + + /* + * See if we have enough memory to handle this resolution + */ + if ((line_size * var->yres * BITS_PER_PIXEL / 8) > ud->total_vram_size) { + return -EINVAL; + } + + var->xres_virtual = var->xres; + var->yres_virtual = ud->total_vram_size / line_size; + + var->red.length = 5; + var->green.length = 6; + var->green.offset = 5; + var->blue.length = 5; + var->transp.offset = var->transp.length = 0; + + if (bgr) { + var->red.offset = 0; + var->blue.offset = 11; + } else { + var->red.offset = 11; + var->blue.offset = 0; + } + + var->nonstd = 0; + var->height = -1; + var->width = -1; + var->vmode = FB_VMODE_NONINTERLACED; + var->sync = 0; + + return 0; +} + +/* + * ubicom32vfb_set_par + * Set the video mode according to info->var + */ +static int ubicom32vfb_set_par(struct fb_info *info) +{ + /* + * Anything changed? + */ + if ((xres == info->var.xres) && (yres == info->var.yres)) { + return 0; + } + + /* + * Implement changes + */ + xres = info->var.xres; + yres = info->var.yres; + info->fix.visual = FB_VISUAL_TRUECOLOR; + info->fix.xpanstep = 0; + info->fix.ypanstep = 1; + info->fix.line_length = xres * (BITS_PER_PIXEL / 8); + + return 0; +} + +/* + * ubicom32vfb_ops + * List of supported operations + */ +static struct fb_ops ubicom32vfb_ops = +{ + .owner = THIS_MODULE, + .fb_pan_display = ubicom32vfb_pan_display, + .fb_setcolreg = ubicom32vfb_setcolreg, + .fb_mmap = ubicom32vfb_mmap, + .fb_check_var = ubicom32vfb_check_var, + .fb_set_par = ubicom32vfb_set_par, + .fb_fillrect = cfb_fillrect, + .fb_copyarea = cfb_copyarea, + .fb_imageblit = cfb_imageblit, +}; + +/* + * ubicom32vfb_release + */ +static int ubicom32vfb_release(struct device *dev) +{ + struct ubicom32vfb_drvdata *ud = dev_get_drvdata(dev); + + unregister_framebuffer(ud->fbinfo); + + if (ud->cmap_alloc) { + fb_dealloc_cmap(&ud->fbinfo->cmap); + } + + if (ud->fb) { + kfree(ud->fb); + } + + framebuffer_release(ud->fbinfo); + dev_set_drvdata(dev, NULL); + + return 0; +} + +/* + * ubicom32vfb_platform_probe + */ +static int __init ubicom32vfb_platform_probe(struct platform_device *pdev) +{ + struct ubicom32vfb_drvdata *ud; + struct fb_info *fbinfo; + int rc; + size_t fbsize; + struct device *dev = &pdev->dev; + int offset; + + /* + * This is the minimum VRAM size + */ + fbsize = xres * yres * 2; + if (!vram_size) { + vram_size = (fbsize + 1023) / 1024; + } else { + if (fbsize > (vram_size * 1024)) { + dev_err(dev, "Not enough VRAM for display, need >= %u bytes\n", fbsize); + return -ENOMEM; // should be ebadparam? + } + } + + /* + * Allocate the framebuffer instance + our private data + */ + fbinfo = framebuffer_alloc(sizeof(struct ubicom32vfb_drvdata), &pdev->dev); + if (!fbinfo) { + dev_err(dev, "Not enough memory to allocate instance.\n"); + return -ENOMEM; + } + + /* + * Fill in our private data. + */ + ud = (struct ubicom32vfb_drvdata *)fbinfo->par; + ud->fbinfo = fbinfo; + dev_set_drvdata(dev, ud); + + /* + * Allocate and align the requested amount of VRAM + */ + ud->total_vram_size = (vram_size * 1024) + UBICOM32VFB_ALIGNMENT; + ud->fb = kmalloc(ud->total_vram_size, GFP_KERNEL); + if (ud->fb == NULL) { + dev_err(dev, "Couldn't allocate VRAM\n"); + rc = -ENOMEM; + goto fail; + } + + offset = (u32_t)ud->fb & (UBICOM32VFB_ALIGNMENT - 1); + if (!offset) { + ud->fb_aligned = ud->fb; + } else { + offset = UBICOM32VFB_ALIGNMENT - offset; + ud->fb_aligned = ud->fb + offset; + } + + /* + * Clear the entire frame buffer + */ + memset(ud->fb_aligned, 0, vram_size * 1024); + + /* + * Fill in the fb_var_screeninfo structure + */ + memset(&ubicom32vfb_var, 0, sizeof(ubicom32vfb_var)); + ubicom32vfb_var.bits_per_pixel = BITS_PER_PIXEL; + ubicom32vfb_var.red.length = 5; + ubicom32vfb_var.green.length = 6; + ubicom32vfb_var.green.offset = 5; + ubicom32vfb_var.blue.length = 5; + ubicom32vfb_var.activate = FB_ACTIVATE_NOW; + + if (bgr) { + ubicom32vfb_var.red.offset = 0; + ubicom32vfb_var.blue.offset = 11; + } else { + ubicom32vfb_var.red.offset = 11; + ubicom32vfb_var.blue.offset = 0; + } + + /* + * Fill in the fb_info structure + */ + ud->fbinfo->device = dev; + ud->fbinfo->screen_base = (void *)ud->fb_aligned; + ud->fbinfo->fbops = &ubicom32vfb_ops; + ud->fbinfo->fix = ubicom32vfb_fix; + ud->fbinfo->fix.smem_start = (u32)ud->fb_aligned; + ud->fbinfo->fix.smem_len = vram_size * 1024; + ud->fbinfo->fix.line_length = xres * 2; + ud->fbinfo->fix.mmio_start = (u32)ud; + ud->fbinfo->fix.mmio_len = sizeof(struct ubicom32vfb_drvdata); + + /* + * We support panning in the y direction only + */ + ud->fbinfo->fix.xpanstep = 0; + ud->fbinfo->fix.ypanstep = 1; + + ud->fbinfo->pseudo_palette = ud->pseudo_palette; + ud->fbinfo->flags = FBINFO_DEFAULT; + ud->fbinfo->var = ubicom32vfb_var; + ud->fbinfo->var.xres = xres; + ud->fbinfo->var.yres = yres; + + /* + * We cannot pan in the X direction, so xres_virtual is xres + * We can pan in the Y direction, so yres_virtual is vram_size / ud->fbinfo->fix.line_length + */ + ud->fbinfo->var.xres_virtual = xres; + ud->fbinfo->var.yres_virtual = (vram_size * 1024) / ud->fbinfo->fix.line_length; + + /* + * Allocate a color map + */ + rc = fb_alloc_cmap(&ud->fbinfo->cmap, PALETTE_ENTRIES_NO, 0); + if (rc) { + dev_err(dev, "Fail to allocate colormap (%d entries)\n", + PALETTE_ENTRIES_NO); + goto fail; + } + ud->cmap_alloc = true; + + /* + * Register new frame buffer + */ + rc = register_framebuffer(ud->fbinfo); + if (rc) { + dev_err(dev, "Could not register frame buffer\n"); + goto fail; + } + + /* + * Tell the log we are here + */ + dev_info(dev, "fbaddr=%p align=%p, size=%uKB screen(%ux%u) virt(%ux%u)\n", + ud->fb, ud->fb_aligned, vram_size, ud->fbinfo->var.xres, ud->fbinfo->var.yres, + ud->fbinfo->var.xres_virtual, ud->fbinfo->var.yres_virtual); + + /* + * Success + */ + return 0; + +fail: + ubicom32vfb_release(dev); + return rc; +} + +/* + * ubicom32vfb_platform_remove + */ +static int ubicom32vfb_platform_remove(struct platform_device *pdev) +{ + dev_info(&(pdev->dev), "Ubicom32 FB Driver Remove\n"); + return ubicom32vfb_release(&pdev->dev); +} + +static struct platform_driver ubicom32vfb_platform_driver = { + .probe = ubicom32vfb_platform_probe, + .remove = ubicom32vfb_platform_remove, + .driver = { + .name = DRIVER_NAME, + .owner = THIS_MODULE, + }, +}; + +#ifndef MODULE +/* + * ubicom32vfb_setup + * Process kernel boot options + */ +static int __init ubicom32vfb_setup(char *options) +{ + char *this_opt; + + if (!options || !*options) { + return 0; + } + + while ((this_opt = strsep(&options, ",")) != NULL) { + if (!*this_opt) { + continue; + } + + if (!strncmp(this_opt, "vram_size=", 10)) { + vram_size = simple_strtoul(this_opt + 10, NULL, 0); + continue; + } + + if (!strncmp(this_opt, "bgr=", 4)) { + bgr = simple_strtoul(this_opt + 4, NULL, 0); + continue; + } + + if (!strncmp(this_opt, "xres=", 5)) { + xres = simple_strtoul(this_opt + 5, NULL, 0); + continue; + } + + if (!strncmp(this_opt, "yres=", 5)) { + yres = simple_strtoul(this_opt + 5, NULL, 0); + continue; + } + } + return 0; +} +#endif /* MODULE */ + +/* + * ubicom32vfb_init + */ +static int __devinit ubicom32vfb_init(void) +{ + int ret; + +#ifndef MODULE + /* + * Get kernel boot options (in 'video=ubicom32vfb:<options>') + */ + char *option = NULL; + + if (fb_get_options(DRIVER_NAME, &option)) { + return -ENODEV; + } + ubicom32vfb_setup(option); +#endif /* MODULE */ + + ret = platform_driver_register(&ubicom32vfb_platform_driver); + +#ifdef CONFIG_FB_UBICOM32_VIRTUAL_NOAUTO + return ret; +#else + if (!ret) { + ubicom32vfb_platform_device = platform_device_alloc(DRIVER_NAME, 0); + + if (ubicom32vfb_platform_device) + ret = platform_device_add(ubicom32vfb_platform_device); + else + ret = -ENOMEM; + + if (ret) { + platform_device_put(ubicom32vfb_platform_device); + platform_driver_unregister(&ubicom32vfb_platform_driver); + } + } + + return ret; +#endif +} +module_init(ubicom32vfb_init); + +/* + * ubicom32vfb_exit + */ +static void __exit ubicom32vfb_exit(void) +{ + platform_device_unregister(ubicom32vfb_platform_device); + platform_driver_unregister(&ubicom32vfb_platform_driver); +} +module_exit(ubicom32vfb_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Patrick Tjin <@ubicom.com>"); +MODULE_DESCRIPTION(DRIVER_DESCRIPTION); |