diff options
Diffstat (limited to 'target/linux/ar71xx/files/arch/mips/ar71xx/prom.c')
-rw-r--r-- | target/linux/ar71xx/files/arch/mips/ar71xx/prom.c | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/target/linux/ar71xx/files/arch/mips/ar71xx/prom.c b/target/linux/ar71xx/files/arch/mips/ar71xx/prom.c new file mode 100644 index 0000000000..e21464fc18 --- /dev/null +++ b/target/linux/ar71xx/files/arch/mips/ar71xx/prom.c @@ -0,0 +1,126 @@ +/* + * Atheros AR71xx SoC specific prom routines + * + * Copyright (C) 2008 Gabor Juhos <juhosg@openwrt.org> + * Copyright (C) 2008 Imre Kaloz <kaloz@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/io.h> +#include <linux/serial_reg.h> + +#include <asm/bootinfo.h> +#include <asm/addrspace.h> + +#include <asm/mach-ar71xx/ar71xx.h> + +struct board_rec { + char *name; + unsigned long mach_type; +}; + +static int prom_argc __initdata; +static char **prom_argv __initdata; +static char **prom_envp __initdata; + +static struct board_rec boards[] __initdata = { + { + .name = "411", + .mach_type = MACH_AR71XX_RB_411, + }, { + .name = "433", + .mach_type = MACH_AR71XX_RB_433, + }, { + .name = "450", + .mach_type = MACH_AR71XX_RB_450, + } +}; + +char *(*prom_getenv)(const char *envname) __initdata; + +static __init char *dummy_getenv(const char *envname) +{ + return NULL; +} + +static void __init routerboot_printargs(void) +{ + int i; + + for (i = 0; i < prom_argc; i++) + printk(KERN_DEBUG "prom: routerboot envp[%d]: %s\n", + i, prom_envp[i]); +} + +static __init char *routerboot_getenv(const char *envname) +{ + char **env; + int i = strlen(envname); + + for (env = prom_envp; *env != NULL; env++) + if (strncmp(envname, *env, i) == 0 && (*env)[i] == '=') + return *env + i + 1; + + return NULL; +} + +static __init unsigned long find_board_byname(char *name) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(boards); i++) + if (strcmp(name, boards[i].name) == 0) + return boards[i].mach_type; + + return MACH_AR71XX_GENERIC; +} + +void __init prom_init(void) +{ + char *board; + + 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); + + prom_getenv = dummy_getenv; + + if ((fw_arg0 == 7) && (fw_arg2 == 0)) { + prom_argc = fw_arg0; + prom_envp = (char **)fw_arg1; + prom_getenv = routerboot_getenv; + routerboot_printargs(); + } + + board = prom_getenv("board"); + if (board) + mips_machtype = find_board_byname(board); + else + mips_machtype = MACH_AR71XX_GENERIC; + + ar71xx_print_cmdline(); +} + +void __init prom_free_prom_memory(void) +{ + /* We do not have to prom memory to free */ +} + +#define UART_READ(r) \ + __raw_readl((void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4 * (r))) + +#define UART_WRITE(r, v) \ + __raw_writel((v), (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4*(r))) + +void prom_putchar(unsigned char ch) +{ + while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0); + UART_WRITE(UART_TX, ch); + while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0); +} |