/* * Copyright (C) 2004-2006 Atmel Corporation * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that 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 */ #include <common.h> #include <command.h> #include <image.h> #include <zlib.h> #include <asm/byteorder.h> #include <asm/addrspace.h> #include <asm/io.h> #include <asm/setup.h> #include <asm/arch/clk.h> DECLARE_GLOBAL_DATA_PTR; /* CPU-specific hook to allow flushing of caches, etc. */ extern void prepare_to_boot(void); static struct tag *setup_start_tag(struct tag *params) { params->hdr.tag = ATAG_CORE; params->hdr.size = tag_size(tag_core); params->u.core.flags = 0; params->u.core.pagesize = 4096; params->u.core.rootdev = 0; return tag_next(params); } static struct tag *setup_memory_tags(struct tag *params) { bd_t *bd = gd->bd; int i; for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) { params->hdr.tag = ATAG_MEM; params->hdr.size = tag_size(tag_mem_range); params->u.mem_range.addr = bd->bi_dram[i].start; params->u.mem_range.size = bd->bi_dram[i].size; params = tag_next(params); } return params; } static struct tag *setup_commandline_tag(struct tag *params, char *cmdline) { if (!cmdline) return params; /* eat leading white space */ while (*cmdline == ' ') cmdline++; /* * Don't include tags for empty command lines; let the kernel * use its default command line. */ if (*cmdline == '\0') return params; params->hdr.tag = ATAG_CMDLINE; params->hdr.size = (sizeof (struct tag_header) + strlen(cmdline) + 1 + 3) >> 2; strcpy(params->u.cmdline.cmdline, cmdline); return tag_next(params); } static struct tag *setup_ramdisk_tag(struct tag *params, unsigned long rd_start, unsigned long rd_end) { if (rd_start == rd_end) return params; params->hdr.tag = ATAG_RDIMG; params->hdr.size = tag_size(tag_mem_range); params->u.mem_range.addr = rd_start; params->u.mem_range.size = rd_end - rd_start; return tag_next(params); } static struct tag *setup_clock_tags(struct tag *params) { params->hdr.tag = ATAG_CLOCK; params->hdr.size = tag_size(tag_clock); params->u.clock.clock_id = ACLOCK_BOOTCPU; params->u.clock.clock_flags = 0; params->u.clock.clock_hz = gd->cpu_hz; #ifdef CONFIG_AT32AP7000 /* * New kernels don't need this, but we should be backwards * compatible for a while... */ params = tag_next(params); params->hdr.tag = ATAG_CLOCK; params->hdr.size = tag_size(tag_clock); params->u.clock.clock_id = ACLOCK_HSB; params->u.clock.clock_flags = 0; params->u.clock.clock_hz = get_hsb_clk_rate(); #endif return tag_next(params); } static struct tag *setup_ethernet_tag(struct tag *params, char *addr, int index) { char *s, *e; int i; params->hdr.tag = ATAG_ETHERNET; params->hdr.size = tag_size(tag_ethernet); params->u.ethernet.mac_index = index; params->u.ethernet.mii_phy_addr = gd->bd->bi_phy_id[index]; s = addr; for (i = 0; i < 6; i++) { params->u.ethernet.hw_address[i] = simple_strtoul(s, &e, 16); s = e + 1; } return tag_next(params); } static struct tag *setup_ethernet_tags(struct tag *params) { char name[16] = "ethaddr"; char *addr; int i = 0; do { addr = getenv(name); if (addr) params = setup_ethernet_tag(params, addr, i); sprintf(name, "eth%daddr", ++i); } while (i < 4); return params; } static void setup_end_tag(struct tag *params) { params->hdr.tag = ATAG_NONE; params->hdr.size = 0; } int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images) { void (*theKernel)(int magic, void *tagtable); struct tag *params, *params_start; char *commandline = getenv("bootargs"); if ((flag != 0) && (flag != BOOTM_STATE_OS_GO)) return 1; theKernel = (void *)images->ep; show_boot_progress (15); params = params_start = (struct tag *)gd->bd->bi_boot_params; params = setup_start_tag(params); params = setup_memory_tags(params); if (images->rd_start) { params = setup_ramdisk_tag(params, PHYSADDR(images->rd_start), PHYSADDR(images->rd_end)); } params = setup_commandline_tag(params, commandline); params = setup_clock_tags(params); params = setup_ethernet_tags(params); setup_end_tag(params); printf("\nStarting kernel at %p (params at %p)...\n\n", theKernel, params_start); prepare_to_boot(); theKernel(ATAG_MAGIC, params_start); /* does not return */ return 1; }