I have a domain.com and i can redirecto to other subdomains but not domain.com in https, my configuration is the following :

server {
listen 80;
server_name www.domain.com;
rewrite ^/(.*) https://www.domain.com/$1 permanent;
}

server {
listen 80;
server_name m.domain.com;

## redirect http to https ##
rewrite ^/(.*) https://m.domain.com/$1 permanent;
}

server {
listen 443 ssl spdy;

server_name www.domain.com;

...
}

server {
listen 443 ssl spdy;

server_name domain.com;

...
}

server {
listen 443 ssl spdy;

server_name www.domain.com;

...
}

server {
listen 443 ssl spdy;

server_name m.domain.com;

...
}