Enabling and disabling abbrev globally and by major-mode

Question

Have noticed that abbrev-mode only works for the current buffer. Thus using the following configuration does not enable abbrev-mode when I load an org-mode file.

(require 'toro)
(toro-abbrev)

Here is the file that provides the toro-abbrev feature.

(defconst tablet2 
   '( ("is" "s")      ("it" "t")       ("know" "no")
      ("like" "lk")   ("little" "ll")  ("more" "mo")

(defun toro-abbrev ()
  "Enables words to be expanded as one types."
  (interactive)
  (abbrev-mode 1)
  (kill-all-abbrevs)
  (define-abbrev-table 'global-abbrev-table tablet2))

(provide 'toro)

How could I turn on abbrev-mode globally or for buffers with a specific major mode?