1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * RouterBoard 500 specific prom routines
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2003, Peter Sadik <peter.sadik@idt.com>
6*4882a593Smuzhiyun * Copyright (C) 2005-2006, P.Christeas <p_christ@hol.gr>
7*4882a593Smuzhiyun * Copyright (C) 2007, Gabor Juhos <juhosg@openwrt.org>
8*4882a593Smuzhiyun * Felix Fietkau <nbd@openwrt.org>
9*4882a593Smuzhiyun * Florian Fainelli <florian@openwrt.org>
10*4882a593Smuzhiyun */
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #include <linux/init.h>
13*4882a593Smuzhiyun #include <linux/mm.h>
14*4882a593Smuzhiyun #include <linux/export.h>
15*4882a593Smuzhiyun #include <linux/string.h>
16*4882a593Smuzhiyun #include <linux/console.h>
17*4882a593Smuzhiyun #include <linux/memblock.h>
18*4882a593Smuzhiyun #include <linux/ioport.h>
19*4882a593Smuzhiyun #include <linux/blkdev.h>
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun #include <asm/bootinfo.h>
22*4882a593Smuzhiyun #include <asm/mach-rc32434/ddr.h>
23*4882a593Smuzhiyun #include <asm/mach-rc32434/prom.h>
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun unsigned int idt_cpu_freq = 132000000;
26*4882a593Smuzhiyun EXPORT_SYMBOL(idt_cpu_freq);
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun static struct resource ddr_reg[] = {
29*4882a593Smuzhiyun {
30*4882a593Smuzhiyun .name = "ddr-reg",
31*4882a593Smuzhiyun .start = DDR0_PHYS_ADDR,
32*4882a593Smuzhiyun .end = DDR0_PHYS_ADDR + sizeof(struct ddr_ram),
33*4882a593Smuzhiyun .flags = IORESOURCE_MEM,
34*4882a593Smuzhiyun }
35*4882a593Smuzhiyun };
36*4882a593Smuzhiyun
prom_free_prom_memory(void)37*4882a593Smuzhiyun void __init prom_free_prom_memory(void)
38*4882a593Smuzhiyun {
39*4882a593Smuzhiyun /* No prom memory to free */
40*4882a593Smuzhiyun }
41*4882a593Smuzhiyun
match_tag(char * arg,const char * tag)42*4882a593Smuzhiyun static inline int match_tag(char *arg, const char *tag)
43*4882a593Smuzhiyun {
44*4882a593Smuzhiyun return strncmp(arg, tag, strlen(tag)) == 0;
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun
tag2ul(char * arg,const char * tag)47*4882a593Smuzhiyun static inline unsigned long tag2ul(char *arg, const char *tag)
48*4882a593Smuzhiyun {
49*4882a593Smuzhiyun char *num;
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun num = arg + strlen(tag);
52*4882a593Smuzhiyun return simple_strtoul(num, 0, 10);
53*4882a593Smuzhiyun }
54*4882a593Smuzhiyun
prom_setup_cmdline(void)55*4882a593Smuzhiyun void __init prom_setup_cmdline(void)
56*4882a593Smuzhiyun {
57*4882a593Smuzhiyun static char cmd_line[COMMAND_LINE_SIZE] __initdata;
58*4882a593Smuzhiyun char *cp, *board;
59*4882a593Smuzhiyun int prom_argc;
60*4882a593Smuzhiyun char **prom_argv;
61*4882a593Smuzhiyun int i;
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun prom_argc = fw_arg0;
64*4882a593Smuzhiyun prom_argv = (char **) fw_arg1;
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun cp = cmd_line;
67*4882a593Smuzhiyun /* Note: it is common that parameters start
68*4882a593Smuzhiyun * at argv[1] and not argv[0],
69*4882a593Smuzhiyun * however, our elf loader starts at [0] */
70*4882a593Smuzhiyun for (i = 0; i < prom_argc; i++) {
71*4882a593Smuzhiyun if (match_tag(prom_argv[i], FREQ_TAG)) {
72*4882a593Smuzhiyun idt_cpu_freq = tag2ul(prom_argv[i], FREQ_TAG);
73*4882a593Smuzhiyun continue;
74*4882a593Smuzhiyun }
75*4882a593Smuzhiyun #ifdef IGNORE_CMDLINE_MEM
76*4882a593Smuzhiyun /* parses out the "mem=xx" arg */
77*4882a593Smuzhiyun if (match_tag(prom_argv[i], MEM_TAG))
78*4882a593Smuzhiyun continue;
79*4882a593Smuzhiyun #endif
80*4882a593Smuzhiyun if (i > 0)
81*4882a593Smuzhiyun *(cp++) = ' ';
82*4882a593Smuzhiyun if (match_tag(prom_argv[i], BOARD_TAG)) {
83*4882a593Smuzhiyun board = prom_argv[i] + strlen(BOARD_TAG);
84*4882a593Smuzhiyun
85*4882a593Smuzhiyun if (match_tag(board, BOARD_RB532A))
86*4882a593Smuzhiyun mips_machtype = MACH_MIKROTIK_RB532A;
87*4882a593Smuzhiyun else
88*4882a593Smuzhiyun mips_machtype = MACH_MIKROTIK_RB532;
89*4882a593Smuzhiyun }
90*4882a593Smuzhiyun
91*4882a593Smuzhiyun strcpy(cp, prom_argv[i]);
92*4882a593Smuzhiyun cp += strlen(prom_argv[i]);
93*4882a593Smuzhiyun }
94*4882a593Smuzhiyun *(cp++) = ' ';
95*4882a593Smuzhiyun
96*4882a593Smuzhiyun i = strlen(arcs_cmdline);
97*4882a593Smuzhiyun if (i > 0) {
98*4882a593Smuzhiyun *(cp++) = ' ';
99*4882a593Smuzhiyun strcpy(cp, arcs_cmdline);
100*4882a593Smuzhiyun cp += strlen(arcs_cmdline);
101*4882a593Smuzhiyun }
102*4882a593Smuzhiyun cmd_line[COMMAND_LINE_SIZE - 1] = '\0';
103*4882a593Smuzhiyun
104*4882a593Smuzhiyun strcpy(arcs_cmdline, cmd_line);
105*4882a593Smuzhiyun }
106*4882a593Smuzhiyun
prom_init(void)107*4882a593Smuzhiyun void __init prom_init(void)
108*4882a593Smuzhiyun {
109*4882a593Smuzhiyun struct ddr_ram __iomem *ddr;
110*4882a593Smuzhiyun phys_addr_t memsize;
111*4882a593Smuzhiyun phys_addr_t ddrbase;
112*4882a593Smuzhiyun
113*4882a593Smuzhiyun ddr = ioremap(ddr_reg[0].start,
114*4882a593Smuzhiyun ddr_reg[0].end - ddr_reg[0].start);
115*4882a593Smuzhiyun
116*4882a593Smuzhiyun if (!ddr) {
117*4882a593Smuzhiyun printk(KERN_ERR "Unable to remap DDR register\n");
118*4882a593Smuzhiyun return;
119*4882a593Smuzhiyun }
120*4882a593Smuzhiyun
121*4882a593Smuzhiyun ddrbase = (phys_addr_t)&ddr->ddrbase;
122*4882a593Smuzhiyun memsize = (phys_addr_t)&ddr->ddrmask;
123*4882a593Smuzhiyun memsize = 0 - memsize;
124*4882a593Smuzhiyun
125*4882a593Smuzhiyun prom_setup_cmdline();
126*4882a593Smuzhiyun
127*4882a593Smuzhiyun /* give all RAM to boot allocator,
128*4882a593Smuzhiyun * except for the first 0x400 and the last 0x200 bytes */
129*4882a593Smuzhiyun memblock_add(ddrbase + 0x400, memsize - 0x600);
130*4882a593Smuzhiyun }
131