^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 probing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Try to convert "screen_info" into a "simple-framebuffer" compatible mode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * If the mode is incompatible, we return "false" and let the caller create
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * legacy nodes instead.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/platform_data/simplefb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/screen_info.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <asm/sysfb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) static const char simplefb_resname[] = "BOOTFB";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) static const struct simplefb_format formats[] = SIMPLEFB_FORMATS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) /* try parsing x86 screen_info into a simple-framebuffer mode struct */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) __init bool parse_mode(const struct screen_info *si,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) struct simplefb_platform_data *mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) const struct simplefb_format *f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) __u8 type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) type = si->orig_video_isVGA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) if (type != VIDEO_TYPE_VLFB && type != VIDEO_TYPE_EFI)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) for (i = 0; i < ARRAY_SIZE(formats); ++i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) f = &formats[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) if (si->lfb_depth == f->bits_per_pixel &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) si->red_size == f->red.length &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) si->red_pos == f->red.offset &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) si->green_size == f->green.length &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) si->green_pos == f->green.offset &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) si->blue_size == f->blue.length &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) si->blue_pos == f->blue.offset &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) si->rsvd_size == f->transp.length &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) si->rsvd_pos == f->transp.offset) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) mode->format = f->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) mode->width = si->lfb_width;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) mode->height = si->lfb_height;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) mode->stride = si->lfb_linelength;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) return true;
^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)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) __init int create_simplefb(const struct screen_info *si,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) const struct simplefb_platform_data *mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) struct platform_device *pd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) struct resource res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) u64 base, size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) u32 length;
^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) * If the 64BIT_BASE capability is set, ext_lfb_base will contain the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * upper half of the base address. Assemble the address, then make sure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * it is valid and we can actually access it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) base = si->lfb_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) if (si->capabilities & VIDEO_CAPABILITY_64BIT_BASE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) base |= (u64)si->ext_lfb_base << 32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) if (!base || (u64)(resource_size_t)base != base) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) printk(KERN_DEBUG "sysfb: inaccessible VRAM base\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) * Don't use lfb_size as IORESOURCE size, since it may contain the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) * entire VMEM, and thus require huge mappings. Use just the part we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) * need, that is, the part where the framebuffer is located. But verify
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) * that it does not exceed the advertised VMEM.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) * Note that in case of VBE, the lfb_size is shifted by 16 bits for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) * historical reasons.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) size = si->lfb_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) if (si->orig_video_isVGA == VIDEO_TYPE_VLFB)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) size <<= 16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) length = mode->height * mode->stride;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) if (length > size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) printk(KERN_WARNING "sysfb: VRAM smaller than advertised\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) length = PAGE_ALIGN(length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) /* setup IORESOURCE_MEM as framebuffer memory */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) memset(&res, 0, sizeof(res));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) res.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) res.name = simplefb_resname;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) res.start = base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) res.end = res.start + length - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (res.end <= res.start)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) pd = platform_device_register_resndata(NULL, "simple-framebuffer", 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) &res, 1, mode, sizeof(*mode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) return PTR_ERR_OR_ZERO(pd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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