prom.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:2k
- /*
- * linux/arch/mips/philips/nino/prom.c
- *
- * Copyright (C) 2001 Steven J. Hill (sjhill@realitydiluted.com)
- *
- * 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.
- *
- * Early initialization code for the Philips Nino.
- */
- #include <linux/config.h>
- #include <linux/init.h>
- #include <linux/kernel.h>
- #include <linux/string.h>
- #include <asm/bootinfo.h>
- #include <asm/addrspace.h>
- #include <asm/page.h>
- char arcs_cmdline[COMMAND_LINE_SIZE];
- #ifdef CONFIG_FB_TX3912
- extern u_long tx3912fb_paddr;
- extern u_long tx3912fb_vaddr;
- extern u_long tx3912fb_size;
- #endif
- /* Do basic initialization */
- void __init prom_init(int argc, char **argv,
- unsigned long magic, int *prom_vec)
- {
- u_long free_end, mem_size;
- u_int i;
- /*
- * collect args and prepare cmd_line
- */
- for (i = 1; i < argc; i++) {
- strcat(arcs_cmdline, argv[i]);
- if (i < (argc - 1))
- strcat(arcs_cmdline, " ");
- }
- mips_machgroup = MACH_GROUP_PHILIPS;
- mips_machtype = MACH_PHILIPS_NINO;
- #ifdef CONFIG_NINO_4MB
- mem_size = 4 << 20;
- #elif CONFIG_NINO_8MB
- mem_size = 8 << 20;
- #elif CONFIG_NINO_16MB
- mem_size = 16 << 20;
- #endif
- #ifdef CONFIG_FB_TX3912
- /*
- * The LCD controller requires that the framebuffer
- * start address fall within a 1MB segment and is
- * aligned on a 16 byte boundary. The way to assure
- * this is to place the framebuffer at the end of
- * memory and mark it as reserved.
- */
- free_end = (mem_size - tx3912fb_size) & PAGE_MASK;
- add_memory_region(0, free_end, BOOT_MEM_RAM);
- add_memory_region(free_end, (mem_size - free_end), BOOT_MEM_RESERVED);
- /*
- * Calculate physical and virtual addresses for
- * the beginning of the framebuffer.
- */
- tx3912fb_paddr = PHYSADDR(free_end);
- tx3912fb_vaddr = KSEG1ADDR(free_end);
- #else
- add_memory_region(0, mem_size, BOOT_MEM_RAM);
- #endif
- }
- void __init prom_free_prom_memory (void)
- {
- }