Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * Generic System Framebuffers on x86
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * Copyright (c) 2012-2013 David Herrmann <dh.herrmann@gmail.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  * Simple-Framebuffer support for x86 systems
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  * Create a platform-device for any available boot framebuffer. The
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  * simple-framebuffer platform device is already available on DT systems, so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  * this module parses the global "screen_info" object and creates a suitable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  * platform device compatible with the "simple-framebuffer" DT object. If
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  * the framebuffer is incompatible, we instead create a legacy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)  * "vesa-framebuffer", "efi-framebuffer" or "platform-framebuffer" device and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)  * pass the screen_info as platform_data. This allows legacy drivers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)  * to pick these devices up without messing with simple-framebuffer drivers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)  * The global "screen_info" is still valid at all times.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)  * If CONFIG_X86_SYSFB is not selected, we never register "simple-framebuffer"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)  * platform devices, but only use legacy framebuffer devices for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)  * backwards compatibility.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)  * TODO: We set the dev_id field of all platform-devices to 0. This allows
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)  * other x86 OF/DT parsers to create such devices, too. However, they must
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)  * start at offset 1 for this to work.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <linux/platform_data/simplefb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include <linux/screen_info.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include <asm/sysfb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) static __init int sysfb_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	struct screen_info *si = &screen_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	struct simplefb_platform_data mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	struct platform_device *pd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	const char *name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	bool compatible;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	sysfb_apply_efi_quirks();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	/* try to create a simple-framebuffer device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	compatible = parse_mode(si, &mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	if (compatible) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 		ret = create_simplefb(si, &mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 		if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 			return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	/* if the FB is incompatible, create a legacy framebuffer device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 	if (si->orig_video_isVGA == VIDEO_TYPE_EFI)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 		name = "efi-framebuffer";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	else if (si->orig_video_isVGA == VIDEO_TYPE_VLFB)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 		name = "vesa-framebuffer";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 		name = "platform-framebuffer";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	pd = platform_device_register_resndata(NULL, name, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 					       NULL, 0, si, sizeof(*si));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 	return PTR_ERR_OR_ZERO(pd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) /* must execute after PCI subsystem for EFI quirks */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) device_initcall(sysfb_init);