Remove superfluous JTAG disable code (#6445)

* Remove superfluous JTAG disable code

* 32A has differently named register

* Accidentally some operators

* 32A also has different JTAG pins

* Wrap disable_jtag() in an ifndef

* Document this new define

* Rename the define, it conflicts with a LUFA thing

Also, move the ifndef wrapping to the call in keyboard_setup()

tmk_core/common/keyboard.c

@@ -130,10 +130,15 @@ static inline bool has_ghost_in_row(uint8_t row, matrix_row_t rowdata)
 #endif
 
 void disable_jtag(void) {
-// To use PORTF disable JTAG with writing JTD bit twice within four cycles.
-#if (defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__) || defined(__AVR_ATmega32U4__))
+// To use PF4-7 (PC2-5 on ATmega32A), disable JTAG by writing JTD bit twice within four cycles.
+#if (defined(__AVR_AT90USB646__)  || defined(__AVR_AT90USB647__)  || \
+     defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__) || \
+     defined(__AVR_ATmega16U4__)  || defined(__AVR_ATmega32U4__))
     MCUCR |= _BV(JTD);
     MCUCR |= _BV(JTD);
+#elif defined(__AVR_ATmega32A__)
+    MCUCSR |= _BV(JTD);
+    MCUCSR |= _BV(JTD);
 #endif
 }
 
@@ -184,7 +189,9 @@ void keyboard_post_init_kb(void) {
  * FIXME: needs doc
  */
 void keyboard_setup(void) {
+#ifndef NO_JTAG_DISABLE
     disable_jtag();
+#endif
     matrix_setup();
     keyboard_pre_init_kb();
 }

tmk_core/common/keyboard.h

@@ -57,8 +57,6 @@ static inline bool IS_RELEASED(keyevent_t event) { return (!IS_NOEVENT(event) &&
     .time = (timer_read() | 1)                          \
 }
 
-void disable_jtag(void);
-
 /* it runs once at early stage of startup before keyboard_init. */
 void keyboard_setup(void);
 /* it runs once after initializing host side protocol, debug and MCU peripherals. */