1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (C) Copyright 2008 - 2013 Tensilica Inc.
4 * (C) Copyright 2014 Cadence Design Systems Inc.
5 */
6
7 #include <common.h>
8 #include <bootstage.h>
9 #include <command.h>
10 #include <cpu_func.h>
11 #include <env.h>
12 #include <asm/global_data.h>
13 #include <u-boot/zlib.h>
14 #include <asm/byteorder.h>
15 #include <asm/addrspace.h>
16 #include <asm/bootparam.h>
17 #include <asm/cache.h>
18 #include <image.h>
19
20 DECLARE_GLOBAL_DATA_PTR;
21
22 /*
23 * Setup boot-parameters.
24 */
25
setup_first_tag(struct bp_tag * params)26 static struct bp_tag *setup_first_tag(struct bp_tag *params)
27 {
28 params->id = BP_TAG_FIRST;
29 params->size = sizeof(long);
30 *(unsigned long *)¶ms->data = BP_VERSION;
31
32 return bp_tag_next(params);
33 }
34
setup_last_tag(struct bp_tag * params)35 static struct bp_tag *setup_last_tag(struct bp_tag *params)
36 {
37 params->id = BP_TAG_LAST;
38 params->size = 0;
39
40 return bp_tag_next(params);
41 }
42
setup_memory_tag(struct bp_tag * params)43 static struct bp_tag *setup_memory_tag(struct bp_tag *params)
44 {
45 struct meminfo *mem;
46
47 params->id = BP_TAG_MEMORY;
48 params->size = sizeof(struct meminfo);
49 mem = (struct meminfo *)params->data;
50 mem->type = MEMORY_TYPE_CONVENTIONAL;
51 mem->start = PHYSADDR(gd->ram_base);
52 mem->end = PHYSADDR(gd->ram_base + gd->ram_size);
53
54 printf(" MEMORY: tag:0x%04x, type:0X%lx, start:0X%lx, end:0X%lx\n",
55 BP_TAG_MEMORY, mem->type, mem->start, mem->end);
56
57 return bp_tag_next(params);
58 }
59
setup_commandline_tag(struct bp_tag * params,char * cmdline)60 static struct bp_tag *setup_commandline_tag(struct bp_tag *params,
61 char *cmdline)
62 {
63 int len;
64
65 if (!cmdline)
66 return params;
67
68 len = strlen(cmdline);
69
70 params->id = BP_TAG_COMMAND_LINE;
71 params->size = (len + 3) & -4;
72 strcpy((char *)params->data, cmdline);
73
74 printf(" COMMAND_LINE: tag:0x%04x, size:%u, data:'%s'\n",
75 BP_TAG_COMMAND_LINE, params->size, cmdline);
76
77 return bp_tag_next(params);
78 }
79
setup_ramdisk_tag(struct bp_tag * params,unsigned long rd_start,unsigned long rd_end)80 static struct bp_tag *setup_ramdisk_tag(struct bp_tag *params,
81 unsigned long rd_start,
82 unsigned long rd_end)
83 {
84 struct meminfo *mem;
85
86 if (rd_start == rd_end)
87 return params;
88
89 /* Add a single banked memory */
90
91 params->id = BP_TAG_INITRD;
92 params->size = sizeof(struct meminfo);
93
94 mem = (struct meminfo *)params->data;
95 mem->type = MEMORY_TYPE_CONVENTIONAL;
96 mem->start = PHYSADDR(rd_start);
97 mem->end = PHYSADDR(rd_end);
98
99 printf(" INITRD: tag:0x%x, type:0X%04lx, start:0X%lx, end:0X%lx\n",
100 BP_TAG_INITRD, mem->type, mem->start, mem->end);
101
102 return bp_tag_next(params);
103 }
104
setup_serial_tag(struct bp_tag * params)105 static struct bp_tag *setup_serial_tag(struct bp_tag *params)
106 {
107 params->id = BP_TAG_SERIAL_BAUDRATE;
108 params->size = sizeof(unsigned long);
109 params->data[0] = gd->baudrate;
110
111 printf(" SERIAL_BAUDRATE: tag:0x%04x, size:%u, baudrate:%lu\n",
112 BP_TAG_SERIAL_BAUDRATE, params->size, params->data[0]);
113
114 return bp_tag_next(params);
115 }
116
117 #ifdef CONFIG_OF_LIBFDT
118
setup_fdt_tag(struct bp_tag * params,void * fdt_start)119 static struct bp_tag *setup_fdt_tag(struct bp_tag *params, void *fdt_start)
120 {
121 params->id = BP_TAG_FDT;
122 params->size = sizeof(unsigned long);
123 params->data[0] = (unsigned long)fdt_start;
124
125 printf(" FDT: tag:0x%04x, size:%u, start:0x%lx\n",
126 BP_TAG_FDT, params->size, params->data[0]);
127
128 return bp_tag_next(params);
129 }
130
131 #endif
132
133 /*
134 * Boot Linux.
135 */
136
do_bootm_linux(int flag,int argc,char * argv[],bootm_headers_t * images)137 int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
138 {
139 struct bp_tag *params, *params_start;
140 ulong initrd_start, initrd_end;
141 char *commandline = env_get("bootargs");
142
143 if (!(flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)))
144 return 0;
145
146 show_boot_progress(15);
147
148 if (images->rd_start) {
149 initrd_start = images->rd_start;
150 initrd_end = images->rd_end;
151 } else {
152 initrd_start = 0;
153 initrd_end = 0;
154 }
155
156 params_start = (struct bp_tag *)gd->bd->bi_boot_params;
157 params = params_start;
158 params = setup_first_tag(params);
159 params = setup_memory_tag(params);
160 params = setup_commandline_tag(params, commandline);
161 params = setup_serial_tag(params);
162
163 if (initrd_start)
164 params = setup_ramdisk_tag(params, initrd_start, initrd_end);
165
166 #ifdef CONFIG_OF_LIBFDT
167 if (images->ft_addr)
168 params = setup_fdt_tag(params, images->ft_addr);
169 #endif
170
171 printf("\n");
172
173 params = setup_last_tag(params);
174
175 show_boot_progress(15);
176
177 printf("Transferring Control to Linux @0x%08lx ...\n\n",
178 (ulong)images->ep);
179
180 flush_dcache_range((unsigned long)params_start, (unsigned long)params);
181
182 if (flag & BOOTM_STATE_OS_FAKE_GO)
183 return 0;
184
185 /*
186 * _start() in vmlinux expects boot params in register a2.
187 * NOTE:
188 * Disable/delete your u-boot breakpoints before stepping into linux.
189 */
190 asm volatile ("mov a2, %0\n\t"
191 "jx %1\n\t"
192 : : "a" (params_start), "a" (images->ep)
193 : "a2");
194
195 /* Does not return */
196
197 return 1;
198 }
199
200