serial: 8250: move RSA functions to 8250_rsa.c

They are RSA-specific, so should live in a preexisting 8250_rsa.c. Move
them there.

Signed-off-by: "Jiri Slaby (SUSE)" <[e-mail]>
Reviewed-by: Ilpo Järvinen <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/tty/serial/8250/8250.h

···
 
 #ifdef CONFIG_SERIAL_8250_RSA
 void univ8250_rsa_support(struct uart_ops *ops);
+void rsa_enable(struct uart_8250_port *up);
+void rsa_disable(struct uart_8250_port *up);
+void rsa_autoconfig(struct uart_8250_port *up);
+void rsa_reset(struct uart_8250_port *up);
 #else
 static inline void univ8250_rsa_support(struct uart_ops *ops) { }
+static inline void rsa_enable(struct uart_8250_port *up) {}
+static inline void rsa_disable(struct uart_8250_port *up) {}
+static inline void rsa_autoconfig(struct uart_8250_port *up) {}
+static inline void rsa_reset(struct uart_8250_port *up) {}
 #endif
 
 #ifdef CONFIG_SERIAL_8250_FINTEK

drivers/tty/serial/8250/8250_port.c

···
 		serial_out(up, UART_IER, 0);
 }
 
-#ifdef CONFIG_SERIAL_8250_RSA
-/*
- * Attempts to turn on the RSA FIFO.  Returns zero on failure.
- * We set the port uart clock rate if we succeed.
- */
-static int __rsa_enable(struct uart_8250_port *up)
-{
-	unsigned char mode;
-	int result;
-
-	mode = serial_in(up, UART_RSA_MSR);
-	result = mode & UART_RSA_MSR_FIFO;
-
-	if (!result) {
-		serial_out(up, UART_RSA_MSR, mode | UART_RSA_MSR_FIFO);
-		mode = serial_in(up, UART_RSA_MSR);
-		result = mode & UART_RSA_MSR_FIFO;
-	}
-
-	if (result)
-		up->port.uartclk = SERIAL_RSA_BAUD_BASE * 16;
-
-	return result;
-}
-
-/*
- * If this is an RSA port, see if we can kick it up to the higher speed clock.
- */
-static void rsa_enable(struct uart_8250_port *up)
-{
-	if (up->port.type != PORT_RSA)
-		return;
-
-	if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16) {
-		uart_port_lock_irq(&up->port);
-		__rsa_enable(up);
-		uart_port_unlock_irq(&up->port);
-	}
-	if (up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16)
-		serial_out(up, UART_RSA_FRR, 0);
-}
-
-/*
- * Attempts to turn off the RSA FIFO and resets the RSA board back to 115kbps compat mode. It is
- * unknown why interrupts were disabled in here. However, the caller is expected to preserve this
- * behaviour by grabbing the spinlock before calling this function.
- */
-static void rsa_disable(struct uart_8250_port *up)
-{
-	unsigned char mode;
-	int result;
-
-	if (up->port.type != PORT_RSA)
-		return;
-
-	if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16)
-		return;
-
-	uart_port_lock_irq(&up->port);
-	mode = serial_in(up, UART_RSA_MSR);
-	result = !(mode & UART_RSA_MSR_FIFO);
-
-	if (!result) {
-		serial_out(up, UART_RSA_MSR, mode & ~UART_RSA_MSR_FIFO);
-		mode = serial_in(up, UART_RSA_MSR);
-		result = !(mode & UART_RSA_MSR_FIFO);
-	}
-
-	if (result)
-		up->port.uartclk = SERIAL_RSA_BAUD_BASE_LO * 16;
-	uart_port_unlock_irq(&up->port);
-}
-
-static void rsa_autoconfig(struct uart_8250_port *up)
-{
-	/* Only probe for RSA ports if we got the region. */
-	if (up->port.type != PORT_16550A)
-		return;
-	if (!(up->probe & UART_PROBE_RSA))
-		return;
-
-	if (__rsa_enable(up))
-		up->port.type = PORT_RSA;
-}
-
-static void rsa_reset(struct uart_8250_port *up)
-{
-	if (up->port.type != PORT_RSA)
-		return;
-
-	serial_out(up, UART_RSA_FRR, 0);
-}
-#else
-static inline void rsa_enable(struct uart_8250_port *up) {}
-static inline void rsa_disable(struct uart_8250_port *up) {}
-static inline void rsa_autoconfig(struct uart_8250_port *up) {}
-static inline void rsa_reset(struct uart_8250_port *up) {}
-#endif /* CONFIG_SERIAL_8250_RSA */
-
 /*
  * This is a quickie test to see how big the FIFO is.
  * It doesn't work at all the time, more's the pity.

drivers/tty/serial/8250/8250_rsa.c

···
 module_param_hw_array(probe_rsa, ulong, ioport, &probe_rsa_count, 0444);
 MODULE_PARM_DESC(probe_rsa, "Probe I/O ports for RSA");
 
+/*
+ * Attempts to turn on the RSA FIFO.  Returns zero on failure.
+ * We set the port uart clock rate if we succeed.
+ */
+static int __rsa_enable(struct uart_8250_port *up)
+{
+	unsigned char mode;
+	int result;
+
+	mode = serial_in(up, UART_RSA_MSR);
+	result = mode & UART_RSA_MSR_FIFO;
+
+	if (!result) {
+		serial_out(up, UART_RSA_MSR, mode | UART_RSA_MSR_FIFO);
+		mode = serial_in(up, UART_RSA_MSR);
+		result = mode & UART_RSA_MSR_FIFO;
+	}
+
+	if (result)
+		up->port.uartclk = SERIAL_RSA_BAUD_BASE * 16;
+
+	return result;
+}
+
+/*
+ * If this is an RSA port, see if we can kick it up to the higher speed clock.
+ */
+void rsa_enable(struct uart_8250_port *up)
+{
+	if (up->port.type != PORT_RSA)
+		return;
+
+	if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16) {
+		uart_port_lock_irq(&up->port);
+		__rsa_enable(up);
+		uart_port_unlock_irq(&up->port);
+	}
+	if (up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16)
+		serial_out(up, UART_RSA_FRR, 0);
+}
+
+/*
+ * Attempts to turn off the RSA FIFO and resets the RSA board back to 115kbps compat mode. It is
+ * unknown why interrupts were disabled in here. However, the caller is expected to preserve this
+ * behaviour by grabbing the spinlock before calling this function.
+ */
+void rsa_disable(struct uart_8250_port *up)
+{
+	unsigned char mode;
+	int result;
+
+	if (up->port.type != PORT_RSA)
+		return;
+
+	if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16)
+		return;
+
+	uart_port_lock_irq(&up->port);
+	mode = serial_in(up, UART_RSA_MSR);
+	result = !(mode & UART_RSA_MSR_FIFO);
+
+	if (!result) {
+		serial_out(up, UART_RSA_MSR, mode & ~UART_RSA_MSR_FIFO);
+		mode = serial_in(up, UART_RSA_MSR);
+		result = !(mode & UART_RSA_MSR_FIFO);
+	}
+
+	if (result)
+		up->port.uartclk = SERIAL_RSA_BAUD_BASE_LO * 16;
+	uart_port_unlock_irq(&up->port);
+}
+
+void rsa_autoconfig(struct uart_8250_port *up)
+{
+	/* Only probe for RSA ports if we got the region. */
+	if (up->port.type != PORT_16550A)
+		return;
+	if (!(up->probe & UART_PROBE_RSA))
+		return;
+
+	if (__rsa_enable(up))
+		up->port.type = PORT_RSA;
+}
+
+void rsa_reset(struct uart_8250_port *up)
+{
+	if (up->port.type != PORT_RSA)
+		return;
+
+	serial_out(up, UART_RSA_FRR, 0);
+}
+
 #ifdef CONFIG_SERIAL_8250_DEPRECATED_OPTIONS
 #ifndef MODULE
 /*