1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * RouterBoard 500 specific prom routines |
4 | * |
5 | * Copyright (C) 2003, Peter Sadik <peter.sadik@idt.com> |
6 | * Copyright (C) 2005-2006, P.Christeas <p_christ@hol.gr> |
7 | * Copyright (C) 2007, Gabor Juhos <juhosg@openwrt.org> |
8 | * Felix Fietkau <nbd@openwrt.org> |
9 | * Florian Fainelli <florian@openwrt.org> |
10 | */ |
11 | |
12 | #include <linux/init.h> |
13 | #include <linux/mm.h> |
14 | #include <linux/export.h> |
15 | #include <linux/string.h> |
16 | #include <linux/console.h> |
17 | #include <linux/memblock.h> |
18 | #include <linux/ioport.h> |
19 | |
20 | #include <asm/bootinfo.h> |
21 | #include <asm/mach-rc32434/ddr.h> |
22 | #include <asm/mach-rc32434/prom.h> |
23 | |
24 | unsigned int idt_cpu_freq = 132000000; |
25 | EXPORT_SYMBOL(idt_cpu_freq); |
26 | |
27 | static struct resource ddr_reg[] = { |
28 | { |
29 | .name = "ddr-reg" , |
30 | .start = DDR0_PHYS_ADDR, |
31 | .end = DDR0_PHYS_ADDR + sizeof(struct ddr_ram), |
32 | .flags = IORESOURCE_MEM, |
33 | } |
34 | }; |
35 | |
36 | static inline int match_tag(char *arg, const char *tag) |
37 | { |
38 | return strncmp(arg, tag, strlen(tag)) == 0; |
39 | } |
40 | |
41 | static inline unsigned long tag2ul(char *arg, const char *tag) |
42 | { |
43 | char *num; |
44 | |
45 | num = arg + strlen(tag); |
46 | return simple_strtoul(num, 0, 10); |
47 | } |
48 | |
49 | void __init prom_setup_cmdline(void) |
50 | { |
51 | static char cmd_line[COMMAND_LINE_SIZE] __initdata; |
52 | char *cp, *board; |
53 | int prom_argc; |
54 | char **prom_argv; |
55 | int i; |
56 | |
57 | prom_argc = fw_arg0; |
58 | prom_argv = (char **) fw_arg1; |
59 | |
60 | cp = cmd_line; |
61 | /* Note: it is common that parameters start |
62 | * at argv[1] and not argv[0], |
63 | * however, our elf loader starts at [0] */ |
64 | for (i = 0; i < prom_argc; i++) { |
65 | if (match_tag(arg: prom_argv[i], tag: FREQ_TAG)) { |
66 | idt_cpu_freq = tag2ul(arg: prom_argv[i], tag: FREQ_TAG); |
67 | continue; |
68 | } |
69 | #ifdef IGNORE_CMDLINE_MEM |
70 | /* parses out the "mem=xx" arg */ |
71 | if (match_tag(prom_argv[i], MEM_TAG)) |
72 | continue; |
73 | #endif |
74 | if (i > 0) |
75 | *(cp++) = ' '; |
76 | if (match_tag(arg: prom_argv[i], tag: BOARD_TAG)) { |
77 | board = prom_argv[i] + strlen(BOARD_TAG); |
78 | |
79 | if (match_tag(board, BOARD_RB532A)) |
80 | mips_machtype = MACH_MIKROTIK_RB532A; |
81 | else |
82 | mips_machtype = MACH_MIKROTIK_RB532; |
83 | } |
84 | |
85 | strcpy(p: cp, q: prom_argv[i]); |
86 | cp += strlen(prom_argv[i]); |
87 | } |
88 | *(cp++) = ' '; |
89 | |
90 | i = strlen(arcs_cmdline); |
91 | if (i > 0) { |
92 | *(cp++) = ' '; |
93 | strcpy(p: cp, q: arcs_cmdline); |
94 | cp += strlen(arcs_cmdline); |
95 | } |
96 | cmd_line[COMMAND_LINE_SIZE - 1] = '\0'; |
97 | |
98 | strcpy(arcs_cmdline, cmd_line); |
99 | } |
100 | |
101 | void __init prom_init(void) |
102 | { |
103 | struct ddr_ram __iomem *ddr; |
104 | phys_addr_t memsize; |
105 | phys_addr_t ddrbase; |
106 | |
107 | ddr = ioremap(offset: ddr_reg[0].start, |
108 | size: ddr_reg[0].end - ddr_reg[0].start); |
109 | |
110 | if (!ddr) { |
111 | printk(KERN_ERR "Unable to remap DDR register\n" ); |
112 | return; |
113 | } |
114 | |
115 | ddrbase = (phys_addr_t)&ddr->ddrbase; |
116 | memsize = (phys_addr_t)&ddr->ddrmask; |
117 | memsize = 0 - memsize; |
118 | |
119 | prom_setup_cmdline(); |
120 | |
121 | /* give all RAM to boot allocator, |
122 | * except for the first 0x400 and the last 0x200 bytes */ |
123 | memblock_add(base: ddrbase + 0x400, size: memsize - 0x600); |
124 | } |
125 | |