^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) * RouterBoard 500 specific prom routines
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2003, Peter Sadik <peter.sadik@idt.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (C) 2005-2006, P.Christeas <p_christ@hol.gr>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright (C) 2007, Gabor Juhos <juhosg@openwrt.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Felix Fietkau <nbd@openwrt.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Florian Fainelli <florian@openwrt.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/console.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/memblock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/ioport.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/blkdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <asm/bootinfo.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <asm/mach-rc32434/ddr.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <asm/mach-rc32434/prom.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) unsigned int idt_cpu_freq = 132000000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) EXPORT_SYMBOL(idt_cpu_freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) static struct resource ddr_reg[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) .name = "ddr-reg",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) .start = DDR0_PHYS_ADDR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) .end = DDR0_PHYS_ADDR + sizeof(struct ddr_ram),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) .flags = IORESOURCE_MEM,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) void __init prom_free_prom_memory(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) /* No prom memory to free */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) static inline int match_tag(char *arg, const char *tag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) return strncmp(arg, tag, strlen(tag)) == 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) static inline unsigned long tag2ul(char *arg, const char *tag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) char *num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) num = arg + strlen(tag);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) return simple_strtoul(num, 0, 10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) void __init prom_setup_cmdline(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) static char cmd_line[COMMAND_LINE_SIZE] __initdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) char *cp, *board;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) int prom_argc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) char **prom_argv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) prom_argc = fw_arg0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) prom_argv = (char **) fw_arg1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) cp = cmd_line;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) /* Note: it is common that parameters start
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) * at argv[1] and not argv[0],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) * however, our elf loader starts at [0] */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) for (i = 0; i < prom_argc; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) if (match_tag(prom_argv[i], FREQ_TAG)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) idt_cpu_freq = tag2ul(prom_argv[i], FREQ_TAG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) #ifdef IGNORE_CMDLINE_MEM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) /* parses out the "mem=xx" arg */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if (match_tag(prom_argv[i], MEM_TAG))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) if (i > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) *(cp++) = ' ';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) if (match_tag(prom_argv[i], BOARD_TAG)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) board = prom_argv[i] + strlen(BOARD_TAG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) if (match_tag(board, BOARD_RB532A))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) mips_machtype = MACH_MIKROTIK_RB532A;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) mips_machtype = MACH_MIKROTIK_RB532;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) strcpy(cp, prom_argv[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) cp += strlen(prom_argv[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) *(cp++) = ' ';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) i = strlen(arcs_cmdline);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) if (i > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) *(cp++) = ' ';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) strcpy(cp, arcs_cmdline);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) cp += strlen(arcs_cmdline);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) cmd_line[COMMAND_LINE_SIZE - 1] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) strcpy(arcs_cmdline, cmd_line);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) void __init prom_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) struct ddr_ram __iomem *ddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) phys_addr_t memsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) phys_addr_t ddrbase;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) ddr = ioremap(ddr_reg[0].start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) ddr_reg[0].end - ddr_reg[0].start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) if (!ddr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) printk(KERN_ERR "Unable to remap DDR register\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) ddrbase = (phys_addr_t)&ddr->ddrbase;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) memsize = (phys_addr_t)&ddr->ddrmask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) memsize = 0 - memsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) prom_setup_cmdline();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) /* give all RAM to boot allocator,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) * except for the first 0x400 and the last 0x200 bytes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) memblock_add(ddrbase + 0x400, memsize - 0x600);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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