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