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Diffstat (limited to 'arch/mips/powertv/init.c')
| -rw-r--r-- | arch/mips/powertv/init.c | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/arch/mips/powertv/init.c b/arch/mips/powertv/init.c new file mode 100644 index 000000000000..5f4e4c304e48 --- /dev/null +++ b/arch/mips/powertv/init.c @@ -0,0 +1,128 @@ +/* + * Copyright (C) 1999, 2000, 2004, 2005 MIPS Technologies, Inc. + * All rights reserved. + * Authors: Carsten Langgaard <carstenl@mips.com> + * Maciej W. Rozycki <macro@mips.com> + * Portions copyright (C) 2009 Cisco Systems, Inc. + * + * This program is free software; you can distribute it and/or modify it + * under the terms of the GNU General Public License (Version 2) as + * published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. + * + * PROM library initialisation code. + */ +#include <linux/init.h> +#include <linux/string.h> +#include <linux/kernel.h> + +#include <asm/bootinfo.h> +#include <linux/io.h> +#include <asm/system.h> +#include <asm/cacheflush.h> +#include <asm/traps.h> + +#include <asm/mips-boards/prom.h> +#include <asm/mips-boards/generic.h> +#include <asm/mach-powertv/asic.h> + +#include "init.h" + +int prom_argc; +int *_prom_argv, *_prom_envp; +unsigned long _prom_memsize; + +/* + * YAMON (32-bit PROM) pass arguments and environment as 32-bit pointer. + * This macro take care of sign extension, if running in 64-bit mode. + */ +#define prom_envp(index) ((char *)(long)_prom_envp[(index)]) + +char *prom_getenv(char *envname) +{ + char *result = NULL; + + if (_prom_envp != NULL) { + /* + * Return a pointer to the given environment variable. + * In 64-bit mode: we're using 64-bit pointers, but all pointers + * in the PROM structures are only 32-bit, so we need some + * workarounds, if we are running in 64-bit mode. + */ + int i, index = 0; + + i = strlen(envname); + + while (prom_envp(index)) { + if (strncmp(envname, prom_envp(index), i) == 0) { + result = prom_envp(index + 1); + break; + } + index += 2; + } + } + + return result; +} + +/* TODO: Verify on linux-mips mailing list that the following two */ +/* functions are correct */ +/* TODO: Copy NMI and EJTAG exception vectors to memory from the */ +/* BootROM exception vectors. Flush their cache entries. test it. */ + +static void __init mips_nmi_setup(void) +{ + void *base; +#if defined(CONFIG_CPU_MIPS32_R1) + base = cpu_has_veic ? + (void *)(CAC_BASE + 0xa80) : + (void *)(CAC_BASE + 0x380); +#elif defined(CONFIG_CPU_MIPS32_R2) + base = (void *)0xbfc00000; +#else +#error NMI exception handler address not defined +#endif +} + +static void __init mips_ejtag_setup(void) +{ + void *base; + +#if defined(CONFIG_CPU_MIPS32_R1) + base = cpu_has_veic ? + (void *)(CAC_BASE + 0xa00) : + (void *)(CAC_BASE + 0x300); +#elif defined(CONFIG_CPU_MIPS32_R2) + base = (void *)0xbfc00480; +#else +#error EJTAG exception handler address not defined +#endif +} + +void __init prom_init(void) +{ + prom_argc = fw_arg0; + _prom_argv = (int *) fw_arg1; + _prom_envp = (int *) fw_arg2; + _prom_memsize = (unsigned long) fw_arg3; + + board_nmi_handler_setup = mips_nmi_setup; + board_ejtag_handler_setup = mips_ejtag_setup; + + pr_info("\nLINUX started...\n"); + prom_init_cmdline(); + configure_platform(); + prom_meminit(); + +#ifndef CONFIG_BOOTLOADER_DRIVER + pr_info("\nBootloader driver isn't loaded...\n"); +#endif +} |