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 | 156 |
1 files changed, 156 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..edc3c5e46 --- /dev/null +++ b/target/linux/ramips/files/arch/mips/ralink/common/prom.c @@ -0,0 +1,156 @@ +/* + * Ralink SoC specific prom routines + * + * 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> + +struct board_rec { + char *name; + enum ramips_mach_type mach_type; +}; + +static int ramips_prom_argc __initdata; +static char **ramips_prom_argv __initdata; +static char **ramips_prom_envp __initdata; + +static struct board_rec boards[] __initdata = { + { + .name = "RT-N15", + .mach_type = RAMIPS_MACH_RT_N15, + }, { + .name = "WHR-G300N", + .mach_type = RAMIPS_MACH_WHR_G300N, + } +}; + +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 __init char *ramips_prom_getargv(const char *name) +{ + int len = strlen(name); + int i; + + if (!ramips_prom_argv) { + printk(KERN_DEBUG "argv=%p is invalid, skipping\n", + ramips_prom_argv); + return NULL; + } + + for (i = 0; i < ramips_prom_argc; i++) { + char *argv = to_ram_addr(ramips_prom_argv[i]); + + if (!argv) { + printk(KERN_DEBUG + "argv[%d]=%p is invalid, skipping\n", + i, ramips_prom_argv[i]); + continue; + } + + printk(KERN_DEBUG "argv[%d]: %s\n", i, argv); + if (strncmp(name, argv, len) == 0 && (argv)[len] == '=') + return argv + len + 1; + } + + return NULL; +} + +static __init char *ramips_prom_getenv(const char *envname) +{ +#define PROM_MAX_ENVS 256 + int len = strlen(envname); + char **env; + int i; + + env = ramips_prom_envp; + if (!env) { + printk(KERN_DEBUG "envp=%p is not in RAM, skipping\n", + ramips_prom_envp); + 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] == '=') + return p + len + 1; + } + + return NULL; +#undef PROM_MAX_ENVS +} + +static __init void find_board_byname(char *name) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(boards); i++) + if (strcmp(name, boards[i].name) == 0) { + ramips_mach = boards[i].mach_type; + break; + } +} + +void __init prom_init(void) +{ + char *p; + + 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); + + ramips_prom_argc = fw_arg0; + ramips_prom_argv = to_ram_addr((void *)fw_arg1); + ramips_prom_envp = to_ram_addr((void *)fw_arg2); + + p = ramips_prom_getargv("board"); + if (!p) + p = ramips_prom_getenv("board"); + if (p) + find_board_byname(p); +} + +void __init prom_free_prom_memory(void) +{ + /* We do not have to prom memory to free */ +} |