/* * Ralink SoC specific prom routines * * Copyright (C) 2010 Joonas Lahtinen <joonas.lahtinen@gmail.com> * Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published * by the Free Software Foundation. */ #include <linux/kernel.h> #include <linux/init.h> #include <linux/string.h> #include <asm/bootinfo.h> #include <asm/addrspace.h> #include <asm/mach-ralink/common.h> #include <asm/mach-ralink/machine.h> #include <ralink_soc.h> static inline void *to_ram_addr(void *addr) { u32 base; base = KSEG0ADDR(RALINK_SOC_SDRAM_BASE); if (((u32) addr > base) && ((u32) addr < (base + RALINK_SOC_MEM_SIZE_MAX))) return addr; base = KSEG1ADDR(RALINK_SOC_SDRAM_BASE); if (((u32) addr > base) && ((u32) addr < (base + RALINK_SOC_MEM_SIZE_MAX))) return addr; /* some U-Boot variants uses physical addresses */ base = RALINK_SOC_SDRAM_BASE; if (((u32) addr > base) && ((u32) addr < (base + RALINK_SOC_MEM_SIZE_MAX))) return (void *)KSEG0ADDR(addr); return NULL; } static void __init prom_append_cmdline(const char *name, const char *value) { char buf[COMMAND_LINE_SIZE]; snprintf(buf, sizeof(buf), " %s=%s", name, value); strlcat(arcs_cmdline, buf, sizeof(arcs_cmdline)); } #ifdef CONFIG_IMAGE_CMDLINE_HACK extern char __image_cmdline[]; static int __init use_image_cmdline(void) { char *p = __image_cmdline; int replace = 0; if (*p == '-') { replace = 1; p++; } if (*p == '\0') return 0; if (replace) { strlcpy(arcs_cmdline, p, sizeof(arcs_cmdline)); } else { strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline)); strlcat(arcs_cmdline, p, sizeof(arcs_cmdline)); } return 1; } #else static int inline use_image_cmdline(void) { return 0; } #endif static __init void prom_init_cmdline(int argc, char **argv) { int i; if (use_image_cmdline()) return; if (!argv) { printk(KERN_DEBUG "argv=%p is invalid, skipping\n", argv); return; } for (i = 0; i < argc; i++) { char *p = to_ram_addr(argv[i]); if (!p) { printk(KERN_DEBUG "argv[%d]=%p is invalid, skipping\n", i, argv[i]); continue; } printk(KERN_DEBUG "argv[%d]: %s\n", i, p); strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline)); strlcat(arcs_cmdline, p, sizeof(arcs_cmdline)); } } static __init char *prom_append_env(char **env, const char *envname) { #define PROM_MAX_ENVS 256 int len = strlen(envname); int i; if (!env) { printk(KERN_DEBUG "env=%p is not in RAM, skipping\n", env); return NULL; } for (i = 0; i < PROM_MAX_ENVS; i++) { char *p = to_ram_addr(env[i]); if (!p) break; printk(KERN_DEBUG "env[%d]: %s\n", i, p); if (strncmp(envname, p, len) == 0 && p[len] == '=') prom_append_cmdline(envname, p + len + 1); } return NULL; #undef PROM_MAX_ENVS } void __init prom_init(void) { int argc; char **envp; char **argv; printk(KERN_DEBUG "prom: fw_arg0=%08x, fw_arg1=%08x, fw_arg2=%08x, fw_arg3=%08x\n", (unsigned int)fw_arg0, (unsigned int)fw_arg1, (unsigned int)fw_arg2, (unsigned int)fw_arg3); argc = fw_arg0; argv = to_ram_addr((void *)fw_arg1); prom_init_cmdline(argc, argv); envp = to_ram_addr((void *)fw_arg2); prom_append_env(envp, "board"); prom_append_env(envp, "ethaddr"); } void __init prom_free_prom_memory(void) { /* We do not have to prom memory to free */ }