2 * Copyright (C) 2004-2006 Atmel Corporation
4 * See file CREDITS for list of people who contributed to this
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of
10 * the License, or (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
26 #include <asm/byteorder.h>
27 #include <asm/addrspace.h>
29 #include <asm/setup.h>
30 #include <asm/arch/clk.h>
32 DECLARE_GLOBAL_DATA_PTR;
34 /* CPU-specific hook to allow flushing of caches, etc. */
35 extern void prepare_to_boot(void);
37 static struct tag *setup_start_tag(struct tag *params)
39 params->hdr.tag = ATAG_CORE;
40 params->hdr.size = tag_size(tag_core);
42 params->u.core.flags = 0;
43 params->u.core.pagesize = 4096;
44 params->u.core.rootdev = 0;
46 return tag_next(params);
49 static struct tag *setup_memory_tags(struct tag *params)
54 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
55 params->hdr.tag = ATAG_MEM;
56 params->hdr.size = tag_size(tag_mem_range);
58 params->u.mem_range.addr = bd->bi_dram[i].start;
59 params->u.mem_range.size = bd->bi_dram[i].size;
61 params = tag_next(params);
67 static struct tag *setup_commandline_tag(struct tag *params, char *cmdline)
72 /* eat leading white space */
73 while (*cmdline == ' ') cmdline++;
76 * Don't include tags for empty command lines; let the kernel
77 * use its default command line.
82 params->hdr.tag = ATAG_CMDLINE;
84 (sizeof (struct tag_header) + strlen(cmdline) + 1 + 3) >> 2;
85 strcpy(params->u.cmdline.cmdline, cmdline);
87 return tag_next(params);
90 static struct tag *setup_ramdisk_tag(struct tag *params,
91 unsigned long rd_start,
94 if (rd_start == rd_end)
97 params->hdr.tag = ATAG_RDIMG;
98 params->hdr.size = tag_size(tag_mem_range);
100 params->u.mem_range.addr = rd_start;
101 params->u.mem_range.size = rd_end - rd_start;
103 return tag_next(params);
106 static struct tag *setup_clock_tags(struct tag *params)
108 params->hdr.tag = ATAG_CLOCK;
109 params->hdr.size = tag_size(tag_clock);
110 params->u.clock.clock_id = ACLOCK_BOOTCPU;
111 params->u.clock.clock_flags = 0;
112 params->u.clock.clock_hz = gd->cpu_hz;
114 #ifdef CONFIG_AT32AP7000
116 * New kernels don't need this, but we should be backwards
117 * compatible for a while...
119 params = tag_next(params);
121 params->hdr.tag = ATAG_CLOCK;
122 params->hdr.size = tag_size(tag_clock);
123 params->u.clock.clock_id = ACLOCK_HSB;
124 params->u.clock.clock_flags = 0;
125 params->u.clock.clock_hz = get_hsb_clk_rate();
128 return tag_next(params);
131 static struct tag *setup_ethernet_tag(struct tag *params,
132 char *addr, int index)
137 params->hdr.tag = ATAG_ETHERNET;
138 params->hdr.size = tag_size(tag_ethernet);
140 params->u.ethernet.mac_index = index;
141 params->u.ethernet.mii_phy_addr = gd->bd->bi_phy_id[index];
144 for (i = 0; i < 6; i++) {
145 params->u.ethernet.hw_address[i] = simple_strtoul(s, &e, 16);
149 return tag_next(params);
152 static struct tag *setup_ethernet_tags(struct tag *params)
154 char name[16] = "ethaddr";
161 params = setup_ethernet_tag(params, addr, i);
162 sprintf(name, "eth%daddr", ++i);
168 static void setup_end_tag(struct tag *params)
170 params->hdr.tag = ATAG_NONE;
171 params->hdr.size = 0;
174 int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
176 void (*theKernel)(int magic, void *tagtable);
177 struct tag *params, *params_start;
178 char *commandline = getenv("bootargs");
180 if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
183 theKernel = (void *)images->ep;
185 show_boot_progress (15);
187 params = params_start = (struct tag *)gd->bd->bi_boot_params;
188 params = setup_start_tag(params);
189 params = setup_memory_tags(params);
190 if (images->rd_start) {
191 params = setup_ramdisk_tag(params,
192 PHYSADDR(images->rd_start),
193 PHYSADDR(images->rd_end));
195 params = setup_commandline_tag(params, commandline);
196 params = setup_clock_tags(params);
197 params = setup_ethernet_tags(params);
198 setup_end_tag(params);
200 printf("\nStarting kernel at %p (params at %p)...\n\n",
201 theKernel, params_start);
205 theKernel(ATAG_MAGIC, params_start);
206 /* does not return */