1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2024 Allied Telesis
4 */
5
6 #include <linux/errno.h>
7 #include <linux/libfdt.h>
8 #include <linux/printk.h>
9 #include <linux/types.h>
10
11 #include <asm/fw/fw.h>
12 #include <asm/machine.h>
13
14 static __init int realtek_add_initrd(void *fdt)
15 {
16 int node, err;
17 u32 start, size;
18
19 node = fdt_path_offset(fdt, "/chosen");
20 if (node < 0) {
21 pr_err("/chosen node not found\n");
22 return -ENOENT;
23 }
24
25 start = fw_getenvl("initrd_start");
26 size = fw_getenvl("initrd_size");
27
28 if (start == 0 && size == 0)
29 return 0;
30
31 pr_info("Adding initrd info from environment\n");
32
33 err = fdt_setprop_u32(fdt, node, "linux,initrd-start", start);
34 if (err) {
35 pr_err("unable to set initrd-start: %d\n", err);
36 return err;
37 }
38
39 err = fdt_setprop_u32(fdt, node, "linux,initrd-end", start + size);
40 if (err) {
41 pr_err("unable to set initrd-end: %d\n", err);
42 return err;
43 }
44
45 return 0;
46 }
47
48 static const struct mips_fdt_fixup realtek_fdt_fixups[] __initconst = {
49 { realtek_add_initrd, "add initrd" },
50 {},
51 };
52
53 static __init const void *realtek_fixup_fdt(const void *fdt, const void *match_data)
54 {
55 static unsigned char fdt_buf[16 << 10] __initdata;
56 int err;
57
58 if (fdt_check_header(fdt))
59 panic("Corrupt DT");
60
61 fw_init_cmdline();
62
63 err = apply_mips_fdt_fixups(fdt_buf, sizeof(fdt_buf), fdt, realtek_fdt_fixups);
64 if (err)
65 panic("Unable to fixup FDT: %d", err);
66
67 return fdt_buf;
68
69 }
70
71 static const struct of_device_id realtek_of_match[] __initconst = {
72 { .compatible = "realtek,rtl9302-soc" },
73 {}
74 };
75
76 MIPS_MACHINE(realtek) = {
77 .matches = realtek_of_match,
78 .fixup_fdt = realtek_fixup_fdt,
79 };
80
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