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aml_dt.c
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aml_dt.c
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#define AML_DT_IND_LENGTH_V1 4 /*fixed*/
#define AML_DT_IND_LENGTH_V2 16 /*fixed*/
#define AML_DT_IND_LENGTH 16
#define AML_DT_ID_VARI_TOTAL 3 //Total 3 strings
#define AML_DT_EACH_ID_INT (AML_DT_IND_LENGTH / 4)
/*Latest version: v2*/
#define AML_DT_VERSION_OFFSET 4
#define AML_DT_TOTAL_DTB_OFFSET 8
#define AML_DT_FIRST_DTB_OFFSET 12
//#define AML_DT_DTB_HEADER_SIZE (8+(AML_DT_IND_LENGTH * AML_DT_ID_VARI_TOTAL))
#define AML_DT_DTB_DT_INFO_OFFSET 0
//#define AML_DT_DTB_OFFSET_OFFSET (AML_DT_IND_LENGTH * AML_DT_ID_VARI_TOTAL)
//#define AML_DT_DTB_SIZE_OFFSET 16
#define AML_DT_UBOOT_ENV "aml_dt"
#define DT_HEADER_MAGIC 0xedfe0dd0 /*header of dtb file*/
#define AML_DT_HEADER_MAGIC 0x5f4c4d41 /*"AML_", multi dtbs supported*/
#define readl(addr) (*(volatile unsigned int*)(addr))
unsigned int get_multi_dt_entry(unsigned int fdt_addr){
unsigned int dt_magic = readl(fdt_addr);
unsigned int dt_total = 0;
unsigned int dt_tool_version = 0;
/*printf(" Process device tree. dt magic: %x\n", dt_magic);*/
if(dt_magic == DT_HEADER_MAGIC){/*normal dtb*/
/*printf(" One dtb detected\n");*/
return fdt_addr;
}
if(dt_magic == AML_DT_HEADER_MAGIC){/*multi dtb*/
/*check and set aml_dt*/
char *s;
if ((s = getenv ("get_dt")) != NULL) {
run_command(s, 0);
}
/*version control, compatible with v1*/
dt_tool_version = readl(fdt_addr + AML_DT_VERSION_OFFSET);
unsigned int aml_each_id_length;
unsigned int aml_dtb_offset_offset;
unsigned int aml_dtb_header_size;
if(dt_tool_version == 1)
aml_each_id_length = 4;
else if(dt_tool_version == 2)
aml_each_id_length = 16;
aml_dtb_offset_offset = aml_each_id_length * AML_DT_ID_VARI_TOTAL;
aml_dtb_header_size = 8+(aml_each_id_length * AML_DT_ID_VARI_TOTAL);
printf(" Multi dtb tool version: v%d .\n", dt_tool_version);
/*fdt_addr + 0x8: num of dtbs*/
dt_total = readl(fdt_addr + AML_DT_TOTAL_DTB_OFFSET);
printf(" Multi dtb detected, support %d dtbs.\n", dt_total);
/*Get aml_dt and split to 3 strings*/
int i = 0;
unsigned char *aml_dt_buf;
aml_dt_buf = (unsigned char *)malloc(sizeof(unsigned char)*64);
memset(aml_dt_buf, 0, sizeof(aml_dt_buf));
unsigned char *aml_dt = getenv(AML_DT_UBOOT_ENV);
memcpy(aml_dt_buf, aml_dt, (strlen(aml_dt)>64?64:(strlen(aml_dt)+1)));
unsigned int aml_dt_len = aml_dt_buf ? strlen(aml_dt_buf) : 0;
if(aml_dt_len <= 0){
printf(" Get env aml_dt failed!\n");
return fdt_addr;
}
unsigned char *tokens[3] = {NULL, NULL, NULL};
for(i = 0; i < AML_DT_ID_VARI_TOTAL; i++){
tokens[i] = strsep(&aml_dt_buf, "_");
}
if(aml_dt_buf)
free(aml_dt_buf);
printf(" aml_dt soc: %s platform: %s variant: %s\n", tokens[0], tokens[1], tokens[2]);
/*match and print result*/
unsigned char **dt_info;
dt_info = (unsigned char **)malloc(sizeof(unsigned char *)*AML_DT_ID_VARI_TOTAL);
for(i = 0; i < AML_DT_ID_VARI_TOTAL; i++)
dt_info[i] = (unsigned char *)malloc(sizeof(unsigned char)*aml_each_id_length);
unsigned int dtb_match_num = 0xffff;
unsigned int x = 0, y = 0; //loop counter
unsigned int read_data;
for(i = 0; i < dt_total; i++){
for(x = 0; x < AML_DT_ID_VARI_TOTAL; x++){
for(y = 0; y < aml_each_id_length; y+=4){
read_data = (unsigned char *)readl(fdt_addr + AML_DT_FIRST_DTB_OFFSET + \
i * aml_dtb_header_size + AML_DT_DTB_DT_INFO_OFFSET + \
(x * aml_each_id_length) + y);
dt_info[x][y+0] = (read_data >> 24) & 0xff;
dt_info[x][y+1] = (read_data >> 16) & 0xff;
dt_info[x][y+2] = (read_data >> 8) & 0xff;
dt_info[x][y+3] = (read_data >> 0) & 0xff;
}
}
if(dt_tool_version == 1)
printf(" dtb %d soc: %0.4s plat: %0.4s vari: %0.4s\n", i, (char *)(dt_info[0]), (char *)(dt_info[1]), (char *)(dt_info[2]));
else if(dt_tool_version == 2)
printf(" dtb %d soc: %0.16s plat: %0.16s vari: %0.16s\n", i, (char *)(dt_info[0]), (char *)(dt_info[1]), (char *)(dt_info[2]));
if(!strncmp(tokens[0], (char *)(dt_info[0]), strlen(tokens[0])) && \
!strncmp(tokens[1], (char *)(dt_info[1]), strlen(tokens[1])) && \
!strncmp(tokens[2], (char *)(dt_info[2]), strlen(tokens[2]))){
//printf("Find match dtb\n");
dtb_match_num = i;
}
}
/*clean malloc memory*/
for(i = 0; i < AML_DT_ID_VARI_TOTAL; i++){
if(dt_info[i])
free(dt_info[i]);
}
if(dt_info)
free(dt_info);
/*if find match dtb, return address, or else return main entrance address*/
if(0xffff != dtb_match_num){
printf(" Find match dtb: %d\n", dtb_match_num);
/*this offset is based on dtb image package, so should add on base address*/
return (fdt_addr + readl(fdt_addr + AML_DT_FIRST_DTB_OFFSET + \
dtb_match_num * aml_dtb_header_size + aml_dtb_offset_offset));
}
else{
printf(" Not match any dtb.\n");
return fdt_addr;
}
}
}