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237 lines
5.5 KiB
237 lines
5.5 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Framebuffer driver for mdpy (mediated virtual pci display device). |
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* |
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* See mdpy-defs.h for device specs |
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* |
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* (c) Gerd Hoffmann <[email protected]> |
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* |
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* Using some code snippets from simplefb and cirrusfb. |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms and conditions of the GNU General Public License, |
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* version 2, as published by the Free Software Foundation. |
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* |
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* This program is distributed in the hope it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
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* more details. |
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*/ |
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#include <linux/errno.h> |
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#include <linux/fb.h> |
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#include <linux/io.h> |
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#include <linux/pci.h> |
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#include <linux/module.h> |
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#include <drm/drm_fourcc.h> |
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#include "mdpy-defs.h" |
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static const struct fb_fix_screeninfo mdpy_fb_fix = { |
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.id = "mdpy-fb", |
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.type = FB_TYPE_PACKED_PIXELS, |
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.visual = FB_VISUAL_TRUECOLOR, |
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.accel = FB_ACCEL_NONE, |
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}; |
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static const struct fb_var_screeninfo mdpy_fb_var = { |
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.height = -1, |
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.width = -1, |
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.activate = FB_ACTIVATE_NOW, |
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.vmode = FB_VMODE_NONINTERLACED, |
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.bits_per_pixel = 32, |
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.transp.offset = 24, |
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.red.offset = 16, |
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.green.offset = 8, |
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.blue.offset = 0, |
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.transp.length = 8, |
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.red.length = 8, |
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.green.length = 8, |
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.blue.length = 8, |
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}; |
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#define PSEUDO_PALETTE_SIZE 16 |
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struct mdpy_fb_par { |
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u32 palette[PSEUDO_PALETTE_SIZE]; |
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}; |
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static int mdpy_fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, |
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u_int transp, struct fb_info *info) |
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{ |
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u32 *pal = info->pseudo_palette; |
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u32 cr = red >> (16 - info->var.red.length); |
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u32 cg = green >> (16 - info->var.green.length); |
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u32 cb = blue >> (16 - info->var.blue.length); |
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u32 value, mask; |
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if (regno >= PSEUDO_PALETTE_SIZE) |
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return -EINVAL; |
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value = (cr << info->var.red.offset) | |
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(cg << info->var.green.offset) | |
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(cb << info->var.blue.offset); |
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if (info->var.transp.length > 0) { |
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mask = (1 << info->var.transp.length) - 1; |
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mask <<= info->var.transp.offset; |
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value |= mask; |
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} |
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pal[regno] = value; |
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return 0; |
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} |
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static void mdpy_fb_destroy(struct fb_info *info) |
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{ |
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if (info->screen_base) |
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iounmap(info->screen_base); |
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} |
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static const struct fb_ops mdpy_fb_ops = { |
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.owner = THIS_MODULE, |
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.fb_destroy = mdpy_fb_destroy, |
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.fb_setcolreg = mdpy_fb_setcolreg, |
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.fb_fillrect = cfb_fillrect, |
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.fb_copyarea = cfb_copyarea, |
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.fb_imageblit = cfb_imageblit, |
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}; |
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static int mdpy_fb_probe(struct pci_dev *pdev, |
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const struct pci_device_id *ent) |
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{ |
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struct fb_info *info; |
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struct mdpy_fb_par *par; |
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u32 format, width, height; |
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int ret; |
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ret = pci_enable_device(pdev); |
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if (ret < 0) |
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return ret; |
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ret = pci_request_regions(pdev, "mdpy-fb"); |
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if (ret < 0) |
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return ret; |
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pci_read_config_dword(pdev, MDPY_FORMAT_OFFSET, &format); |
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pci_read_config_dword(pdev, MDPY_WIDTH_OFFSET, &width); |
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pci_read_config_dword(pdev, MDPY_HEIGHT_OFFSET, &height); |
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if (format != DRM_FORMAT_XRGB8888) { |
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pci_err(pdev, "format mismatch (0x%x != 0x%x)\n", |
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format, DRM_FORMAT_XRGB8888); |
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ret = -EINVAL; |
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goto err_release_regions; |
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} |
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if (width < 100 || width > 10000) { |
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pci_err(pdev, "width (%d) out of range\n", width); |
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ret = -EINVAL; |
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goto err_release_regions; |
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} |
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if (height < 100 || height > 10000) { |
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pci_err(pdev, "height (%d) out of range\n", height); |
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ret = -EINVAL; |
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goto err_release_regions; |
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} |
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pci_info(pdev, "mdpy found: %dx%d framebuffer\n", |
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width, height); |
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info = framebuffer_alloc(sizeof(struct mdpy_fb_par), &pdev->dev); |
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if (!info) { |
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ret = -ENOMEM; |
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goto err_release_regions; |
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} |
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pci_set_drvdata(pdev, info); |
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par = info->par; |
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info->fix = mdpy_fb_fix; |
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info->fix.smem_start = pci_resource_start(pdev, 0); |
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info->fix.smem_len = pci_resource_len(pdev, 0); |
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info->fix.line_length = width * 4; |
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info->var = mdpy_fb_var; |
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info->var.xres = width; |
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info->var.yres = height; |
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info->var.xres_virtual = width; |
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info->var.yres_virtual = height; |
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info->screen_size = info->fix.smem_len; |
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info->screen_base = ioremap(info->fix.smem_start, |
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info->screen_size); |
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if (!info->screen_base) { |
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pci_err(pdev, "ioremap(pcibar) failed\n"); |
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ret = -EIO; |
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goto err_release_fb; |
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} |
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info->apertures = alloc_apertures(1); |
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if (!info->apertures) { |
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ret = -ENOMEM; |
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goto err_unmap; |
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} |
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info->apertures->ranges[0].base = info->fix.smem_start; |
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info->apertures->ranges[0].size = info->fix.smem_len; |
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info->fbops = &mdpy_fb_ops; |
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info->flags = FBINFO_DEFAULT; |
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info->pseudo_palette = par->palette; |
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ret = register_framebuffer(info); |
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if (ret < 0) { |
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pci_err(pdev, "mdpy-fb device register failed: %d\n", ret); |
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goto err_unmap; |
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} |
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pci_info(pdev, "fb%d registered\n", info->node); |
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return 0; |
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err_unmap: |
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iounmap(info->screen_base); |
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err_release_fb: |
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framebuffer_release(info); |
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err_release_regions: |
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pci_release_regions(pdev); |
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return ret; |
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} |
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static void mdpy_fb_remove(struct pci_dev *pdev) |
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{ |
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struct fb_info *info = pci_get_drvdata(pdev); |
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unregister_framebuffer(info); |
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framebuffer_release(info); |
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} |
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static struct pci_device_id mdpy_fb_pci_table[] = { |
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{ |
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.vendor = MDPY_PCI_VENDOR_ID, |
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.device = MDPY_PCI_DEVICE_ID, |
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.subvendor = MDPY_PCI_SUBVENDOR_ID, |
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.subdevice = MDPY_PCI_SUBDEVICE_ID, |
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}, { |
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/* end of list */ |
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} |
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}; |
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static struct pci_driver mdpy_fb_pci_driver = { |
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.name = "mdpy-fb", |
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.id_table = mdpy_fb_pci_table, |
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.probe = mdpy_fb_probe, |
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.remove = mdpy_fb_remove, |
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}; |
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static int __init mdpy_fb_init(void) |
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{ |
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int ret; |
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ret = pci_register_driver(&mdpy_fb_pci_driver); |
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if (ret) |
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return ret; |
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return 0; |
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} |
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module_init(mdpy_fb_init); |
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MODULE_DEVICE_TABLE(pci, mdpy_fb_pci_table); |
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MODULE_LICENSE("GPL v2");
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