diff options
Diffstat (limited to 'target/linux/ramips/files/arch/mips/ralink/common/prom.c')
| -rw-r--r-- | target/linux/ramips/files/arch/mips/ralink/common/prom.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/target/linux/ramips/files/arch/mips/ralink/common/prom.c b/target/linux/ramips/files/arch/mips/ralink/common/prom.c new file mode 100644 index 000000000..26169d366 --- /dev/null +++ b/target/linux/ramips/files/arch/mips/ralink/common/prom.c @@ -0,0 +1,168 @@ +/* + * 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> + +unsigned long ramips_mem_base; +unsigned long ramips_mem_size_min; +unsigned long ramips_mem_size_max; + +static inline void *to_ram_addr(void *addr) +{ + u32 base; + + base = KSEG0ADDR(ramips_mem_base); + if (((u32) addr > base) && + ((u32) addr < (base + ramips_mem_size_max))) + return addr; + + base = KSEG1ADDR(ramips_mem_base); + if (((u32) addr > base) && + ((u32) addr < (base + ramips_mem_size_max))) + return addr; + + /* some U-Boot variants uses physical addresses */ + base = ramips_mem_base; + if (((u32) addr > base) && + ((u32) addr < (base + ramips_mem_size_max))) + return (void *)KSEG0ADDR(addr); + + return NULL; +} + +static char ramips_cmdline_buf[COMMAND_LINE_SIZE] __initdata; +static void __init prom_append_cmdline(const char *name, + const char *value) +{ + snprintf(ramips_cmdline_buf, sizeof(ramips_cmdline_buf), + " %s=%s", name, value); + strlcat(arcs_cmdline, ramips_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; + + ramips_soc_prom_init(); + + 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 */ +} |