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125 lines
2.8 KiB
125 lines
2.8 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* RouterBoard 500 specific prom routines |
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* |
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* Copyright (C) 2003, Peter Sadik <[email protected]> |
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* Copyright (C) 2005-2006, P.Christeas <[email protected]> |
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* Copyright (C) 2007, Gabor Juhos <[email protected]> |
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* Felix Fietkau <[email protected]> |
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* Florian Fainelli <[email protected]> |
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*/ |
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#include <linux/init.h> |
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#include <linux/mm.h> |
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#include <linux/export.h> |
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#include <linux/string.h> |
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#include <linux/console.h> |
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#include <linux/memblock.h> |
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#include <linux/ioport.h> |
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#include <linux/blkdev.h> |
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#include <asm/bootinfo.h> |
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#include <asm/mach-rc32434/ddr.h> |
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#include <asm/mach-rc32434/prom.h> |
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unsigned int idt_cpu_freq = 132000000; |
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EXPORT_SYMBOL(idt_cpu_freq); |
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static struct resource ddr_reg[] = { |
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{ |
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.name = "ddr-reg", |
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.start = DDR0_PHYS_ADDR, |
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.end = DDR0_PHYS_ADDR + sizeof(struct ddr_ram), |
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.flags = IORESOURCE_MEM, |
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} |
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}; |
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static inline int match_tag(char *arg, const char *tag) |
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{ |
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return strncmp(arg, tag, strlen(tag)) == 0; |
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} |
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static inline unsigned long tag2ul(char *arg, const char *tag) |
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{ |
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char *num; |
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num = arg + strlen(tag); |
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return simple_strtoul(num, 0, 10); |
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} |
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void __init prom_setup_cmdline(void) |
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{ |
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static char cmd_line[COMMAND_LINE_SIZE] __initdata; |
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char *cp, *board; |
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int prom_argc; |
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char **prom_argv; |
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int i; |
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prom_argc = fw_arg0; |
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prom_argv = (char **) fw_arg1; |
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cp = cmd_line; |
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/* Note: it is common that parameters start |
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* at argv[1] and not argv[0], |
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* however, our elf loader starts at [0] */ |
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for (i = 0; i < prom_argc; i++) { |
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if (match_tag(prom_argv[i], FREQ_TAG)) { |
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idt_cpu_freq = tag2ul(prom_argv[i], FREQ_TAG); |
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continue; |
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} |
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#ifdef IGNORE_CMDLINE_MEM |
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/* parses out the "mem=xx" arg */ |
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if (match_tag(prom_argv[i], MEM_TAG)) |
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continue; |
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#endif |
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if (i > 0) |
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*(cp++) = ' '; |
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if (match_tag(prom_argv[i], BOARD_TAG)) { |
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board = prom_argv[i] + strlen(BOARD_TAG); |
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if (match_tag(board, BOARD_RB532A)) |
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mips_machtype = MACH_MIKROTIK_RB532A; |
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else |
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mips_machtype = MACH_MIKROTIK_RB532; |
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} |
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strcpy(cp, prom_argv[i]); |
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cp += strlen(prom_argv[i]); |
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} |
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*(cp++) = ' '; |
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i = strlen(arcs_cmdline); |
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if (i > 0) { |
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*(cp++) = ' '; |
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strcpy(cp, arcs_cmdline); |
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cp += strlen(arcs_cmdline); |
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} |
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cmd_line[COMMAND_LINE_SIZE - 1] = '\0'; |
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strcpy(arcs_cmdline, cmd_line); |
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} |
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void __init prom_init(void) |
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{ |
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struct ddr_ram __iomem *ddr; |
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phys_addr_t memsize; |
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phys_addr_t ddrbase; |
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ddr = ioremap(ddr_reg[0].start, |
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ddr_reg[0].end - ddr_reg[0].start); |
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if (!ddr) { |
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printk(KERN_ERR "Unable to remap DDR register\n"); |
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return; |
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} |
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ddrbase = (phys_addr_t)&ddr->ddrbase; |
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memsize = (phys_addr_t)&ddr->ddrmask; |
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memsize = 0 - memsize; |
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prom_setup_cmdline(); |
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/* give all RAM to boot allocator, |
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* except for the first 0x400 and the last 0x200 bytes */ |
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memblock_add(ddrbase + 0x400, memsize - 0x600); |
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}
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