projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| d9523678 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 851b4c14 SH |
2 | /* |
| 3 | * framebuffer-coreboot.c | |
| 4 | * | |
| 5 | * Memory based framebuffer accessed through coreboot table. | |
| 6 | * | |
| 7 | * Copyright 2012-2013 David Herrmann <dh.herrmann@gmail.com> | |
| 8 | * Copyright 2017 Google Inc. | |
| 9 | * Copyright 2017 Samuel Holland <samuel@sholland.org> | |
| 851b4c14 SH |
10 | */ |
| 11 | ||
| 12 | #include <linux/device.h> | |
| 13 | #include <linux/kernel.h> | |
| 14 | #include <linux/mm.h> | |
| 15 | #include <linux/module.h> | |
| 16 | #include <linux/platform_data/simplefb.h> | |
| 17 | #include <linux/platform_device.h> | |
| 18 | ||
| 19 | #include "coreboot_table.h" | |
| 20 | ||
| 21 | #define CB_TAG_FRAMEBUFFER 0x12 | |
| 22 | ||
| 23 | static const struct simplefb_format formats[] = SIMPLEFB_FORMATS; | |
| 24 | ||
| 25 | static int framebuffer_probe(struct coreboot_device *dev) | |
| 26 | { | |
| 27 | int i; | |
| 28 | u32 length; | |
| 29 | struct lb_framebuffer *fb = &dev->framebuffer; | |
| 30 | struct platform_device *pdev; | |
| 31 | struct resource res; | |
| 32 | struct simplefb_platform_data pdata = { | |
| 33 | .width = fb->x_resolution, | |
| 34 | .height = fb->y_resolution, | |
| 35 | .stride = fb->bytes_per_line, | |
| 36 | .format = NULL, | |
| 37 | }; | |
| 38 | ||
| 39 | for (i = 0; i < ARRAY_SIZE(formats); ++i) { | |
| 40 | if (fb->bits_per_pixel == formats[i].bits_per_pixel && | |
| 41 | fb->red_mask_pos == formats[i].red.offset && | |
| 42 | fb->red_mask_size == formats[i].red.length && | |
| 43 | fb->green_mask_pos == formats[i].green.offset && | |
| 44 | fb->green_mask_size == formats[i].green.length && | |
| 45 | fb->blue_mask_pos == formats[i].blue.offset && | |
| 46 | fb->blue_mask_size == formats[i].blue.length && | |
| 47 | fb->reserved_mask_pos == formats[i].transp.offset && | |
| 48 | fb->reserved_mask_size == formats[i].transp.length) | |
| 49 | pdata.format = formats[i].name; | |
| 50 | } | |
| 51 | if (!pdata.format) | |
| 52 | return -ENODEV; | |
| 53 | ||
| 54 | memset(&res, 0, sizeof(res)); | |
| 55 | res.flags = IORESOURCE_MEM | IORESOURCE_BUSY; | |
| 56 | res.name = "Coreboot Framebuffer"; | |
| 57 | res.start = fb->physical_address; | |
| 58 | length = PAGE_ALIGN(fb->y_resolution * fb->bytes_per_line); | |
| 59 | res.end = res.start + length - 1; | |
| 60 | if (res.end <= res.start) | |
| 61 | return -EINVAL; | |
| 62 | ||
| 63 | pdev = platform_device_register_resndata(&dev->dev, | |
| 64 | "simple-framebuffer", 0, | |
| 65 | &res, 1, &pdata, | |
| 66 | sizeof(pdata)); | |
| 67 | if (IS_ERR(pdev)) | |
| 68 | pr_warn("coreboot: could not register framebuffer\n"); | |
| 69 | else | |
| 70 | dev_set_drvdata(&dev->dev, pdev); | |
| 71 | ||
| 72 | return PTR_ERR_OR_ZERO(pdev); | |
| 73 | } | |
| 74 | ||
| 75 | static int framebuffer_remove(struct coreboot_device *dev) | |
| 76 | { | |
| 77 | struct platform_device *pdev = dev_get_drvdata(&dev->dev); | |
| 78 | ||
| 79 | platform_device_unregister(pdev); | |
| 80 | ||
| 81 | return 0; | |
| 82 | } | |
| 83 | ||
| 84 | static struct coreboot_driver framebuffer_driver = { | |
| 85 | .probe = framebuffer_probe, | |
| 86 | .remove = framebuffer_remove, | |
| 87 | .drv = { | |
| 88 | .name = "framebuffer", | |
| 89 | }, | |
| 90 | .tag = CB_TAG_FRAMEBUFFER, | |
| 91 | }; | |
| 92 | ||
| 93 | static int __init coreboot_framebuffer_init(void) | |
| 94 | { | |
| 95 | return coreboot_driver_register(&framebuffer_driver); | |
| 96 | } | |
| 97 | ||
| 98 | static void coreboot_framebuffer_exit(void) | |
| 99 | { | |
| 100 | coreboot_driver_unregister(&framebuffer_driver); | |
| 101 | } | |
| 102 | ||
| 103 | module_init(coreboot_framebuffer_init); | |
| 104 | module_exit(coreboot_framebuffer_exit); | |
| 105 | ||
| 106 | MODULE_AUTHOR("Samuel Holland <samuel@sholland.org>"); | |
| 107 | MODULE_LICENSE("GPL"); |