Merge branch 'master' into next
[platform/kernel/u-boot.git] / lib_avr32 / bootm.c
1 /*
2  * Copyright (C) 2004-2006 Atmel Corporation
3  *
4  * See file CREDITS for list of people who contributed to this
5  * project.
6  *
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.
11  *
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.
16  *
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,
20  * MA 02111-1307 USA
21  */
22 #include <common.h>
23 #include <command.h>
24 #include <image.h>
25 #include <zlib.h>
26 #include <asm/byteorder.h>
27 #include <asm/addrspace.h>
28 #include <asm/io.h>
29 #include <asm/setup.h>
30 #include <asm/arch/clk.h>
31
32 DECLARE_GLOBAL_DATA_PTR;
33
34 /* CPU-specific hook to allow flushing of caches, etc. */
35 extern void prepare_to_boot(void);
36
37 static struct tag *setup_start_tag(struct tag *params)
38 {
39         params->hdr.tag = ATAG_CORE;
40         params->hdr.size = tag_size(tag_core);
41
42         params->u.core.flags = 0;
43         params->u.core.pagesize = 4096;
44         params->u.core.rootdev = 0;
45
46         return tag_next(params);
47 }
48
49 static struct tag *setup_memory_tags(struct tag *params)
50 {
51         bd_t *bd = gd->bd;
52         int i;
53
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);
57
58                 params->u.mem_range.addr = bd->bi_dram[i].start;
59                 params->u.mem_range.size = bd->bi_dram[i].size;
60
61                 params = tag_next(params);
62         }
63
64         return params;
65 }
66
67 static struct tag *setup_commandline_tag(struct tag *params, char *cmdline)
68 {
69         if (!cmdline)
70                 return params;
71
72         /* eat leading white space */
73         while (*cmdline == ' ') cmdline++;
74
75         /*
76          * Don't include tags for empty command lines; let the kernel
77          * use its default command line.
78          */
79         if (*cmdline == '\0')
80                 return params;
81
82         params->hdr.tag = ATAG_CMDLINE;
83         params->hdr.size =
84                 (sizeof (struct tag_header) + strlen(cmdline) + 1 + 3) >> 2;
85         strcpy(params->u.cmdline.cmdline, cmdline);
86
87         return tag_next(params);
88 }
89
90 static struct tag *setup_ramdisk_tag(struct tag *params,
91                                      unsigned long rd_start,
92                                      unsigned long rd_end)
93 {
94         if (rd_start == rd_end)
95                 return params;
96
97         params->hdr.tag = ATAG_RDIMG;
98         params->hdr.size = tag_size(tag_mem_range);
99
100         params->u.mem_range.addr = rd_start;
101         params->u.mem_range.size = rd_end - rd_start;
102
103         return tag_next(params);
104 }
105
106 static struct tag *setup_clock_tags(struct tag *params)
107 {
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;
113
114 #ifdef CONFIG_AT32AP7000
115         /*
116          * New kernels don't need this, but we should be backwards
117          * compatible for a while...
118          */
119         params = tag_next(params);
120
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();
126 #endif
127
128         return tag_next(params);
129 }
130
131 static struct tag *setup_ethernet_tag(struct tag *params,
132                                       char *addr, int index)
133 {
134         char *s, *e;
135         int i;
136
137         params->hdr.tag = ATAG_ETHERNET;
138         params->hdr.size = tag_size(tag_ethernet);
139
140         params->u.ethernet.mac_index = index;
141         params->u.ethernet.mii_phy_addr = gd->bd->bi_phy_id[index];
142
143         s = addr;
144         for (i = 0; i < 6; i++) {
145                 params->u.ethernet.hw_address[i] = simple_strtoul(s, &e, 16);
146                 s = e + 1;
147         }
148
149         return tag_next(params);
150 }
151
152 static struct tag *setup_ethernet_tags(struct tag *params)
153 {
154         char name[16] = "ethaddr";
155         char *addr;
156         int i = 0;
157
158         do {
159                 addr = getenv(name);
160                 if (addr)
161                         params = setup_ethernet_tag(params, addr, i);
162                 sprintf(name, "eth%daddr", ++i);
163         } while (i < 4);
164
165         return params;
166 }
167
168 static void setup_end_tag(struct tag *params)
169 {
170         params->hdr.tag = ATAG_NONE;
171         params->hdr.size = 0;
172 }
173
174 int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
175 {
176         void    (*theKernel)(int magic, void *tagtable);
177         struct  tag *params, *params_start;
178         char    *commandline = getenv("bootargs");
179
180         if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
181                 return 1;
182
183         theKernel = (void *)images->ep;
184
185         show_boot_progress (15);
186
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));
194         }
195         params = setup_commandline_tag(params, commandline);
196         params = setup_clock_tags(params);
197         params = setup_ethernet_tags(params);
198         setup_end_tag(params);
199
200         printf("\nStarting kernel at %p (params at %p)...\n\n",
201                theKernel, params_start);
202
203         prepare_to_boot();
204
205         theKernel(ATAG_MAGIC, params_start);
206         /* does not return */
207
208         return 1;
209 }