share prom code

SVN-Revision: 17466

2 files changed, 157 insertions, 1 deletions

diff --git a/target/linux/ramips/files/arch/mips/ralink/common/Makefile b/target/linux/ramips/files/arch/mips/ralink/common/Makefile
index 96f348a..c2cf48b 100644
--- a/target/linux/ramips/files/arch/mips/ralink/common/Makefile
+++ b/target/linux/ramips/files/arch/mips/ralink/common/Makefile
@@ -7,6 +7,6 @@
 # under the terms of the GNU General Public License version 2 as published
 # by the Free Software Foundation.
 
-obj-y	:= setup.o intc.o gpio.o
+obj-y	:= prom.o setup.o intc.o gpio.o
 
 obj-$(CONFIG_RALINK_DEV_GPIO_LEDS)	+= dev-gpio-leds.o
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 0000000..edc3c5e
--- /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 */
+}