How do I set up Nginx conf file to force SSL on only one of the page in my site and non-SSL on all the rest?

For example, I want all of the URLs under /login to be https but all the rest of the URLs to be http.

from another place i found that i need to write these following codes.

for non ssl server block

server {
    root /var/www/
    location / {
    }
    location /login {
        rewrite ^ https://$http_host$request_uri? permanent;
    }
}

and for ssl block the opposite

server {
    listen 443;
    root /var/www/
    location / {
        rewrite ^ http://$http_host$request_uri? permanent;
    }
    location /login {
    }
}

but i tried to implement above codes in my server block but no luck. either it gives syntax error or redirect loop. i just dont understand where exactly i must put those codes.

here is my server block configuration

server {
    listen 80 default_server;
    listen [::]:80 default_server;

    root /var/www/;
    index index.php index.html index.htm;

    server_name mysite.com www.mysite.com;

    location / {
        # try_files $uri $uri/ =404;
        try_files $uri $uri/ /index.php?q=$uri&$args;
    }

    error_page 404 /404.html;
    error_page 500 502 503 504 /50x.html;
    location = /50x.html {
        root /usr/share/nginx/html;
    }

    location ~ \.php$ {
        try_files $uri =404;
        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        fastcgi_pass unix:/var/run/php5-fpm.sock;
        fastcgi_index index.php;
        include fastcgi.conf;
    }

    location ~* .(jpg|jpeg|png|gif|woff|ico|css|js)$ {
    expires 365d;
    }
}

server {
    listen 443 default_server spdy;
    listen [::]:443 default_server spdy;    

    root /var/www/;
    index index.php index.html index.htm;

    server_name mysite.com www.mysite.com;

    ssl on;
    ssl_certificate /my-ssl.crt;
    ssl_certificate_key /mysite.com.key;

    location / {
        # try_files $uri $uri/ =404;
        try_files $uri $uri/ /index.php?q=$uri&$args;
    }

    error_page 404 /404.html;
    error_page 500 502 503 504 /50x.html;
    location = /50x.html {
        root /usr/share/nginx/html;
    }

    location ~ \.php$ {
        try_files $uri =404;
        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        fastcgi_pass unix:/var/run/php5-fpm.sock;
        fastcgi_index index.php;
        include fastcgi.conf;
    }

    location ~* .(jpg|jpeg|png|gif|woff|ico|css|js)$ {
    expires 365d;
    }
}