serial: 8250_exar: Extract PM routine from 8250_port

There are Exar quirks in 8250_port which belong to 8250_exar module.
Extract PM routine to the correct module and do not contaminate generic code
with it.

Cc: Aaron Sierra <asierra@xes-inc.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Sudip Mukherjee <sudip.mukherjee@codethink.co.uk>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20190731170558.52897-2-andriy.shevchenko@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/8250/8250_exar.c

@@ -36,6 +36,7 @@
 
 #define UART_EXAR_INT0		0x80
 #define UART_EXAR_8XMODE	0x88	/* 8X sampling rate select */
+#define UART_EXAR_SLEEP		0x8b	/* Sleep mode */
 #define UART_EXAR_DVID		0x8d	/* Device identification */
 
 #define UART_EXAR_FCTR		0x08	/* Feature Control Register */
@@ -128,6 +129,17 @@ struct exar8250 {
 	int			line[0];
 };
 
+static void exar_pm(struct uart_port *port, unsigned int state, unsigned int old)
+{
+	/*
+	 * Exar UARTs have a SLEEP register that enables or disables each UART
+	 * to enter sleep mode separately. On the XR17V35x the register
+	 * is accessible to each UART at the UART_EXAR_SLEEP offset, but
+	 * the UART channel may only write to the corresponding bit.
+	 */
+	serial_port_out(port, UART_EXAR_SLEEP, state ? 0xff : 0);
+}
+
 static int default_setup(struct exar8250 *priv, struct pci_dev *pcidev,
 			 int idx, unsigned int offset,
 			 struct uart_8250_port *port)
@@ -155,6 +167,8 @@ static int default_setup(struct exar8250 *priv, struct pci_dev *pcidev,
 		port->port.type = PORT_XR17D15X;
 	}
 
+	port->port.pm = exar_pm;
+
 	return 0;
 }
 

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

@@ -44,7 +44,6 @@
  * These are definitions for the Exar XR17V35X and XR17(C|D)15X
  */
 #define UART_EXAR_INT0		0x80
-#define UART_EXAR_SLEEP		0x8b	/* Sleep mode */
 
 /* Nuvoton NPCM timeout register */
 #define UART_NPCM_TOR          7
@@ -708,19 +707,8 @@ EXPORT_SYMBOL_GPL(serial8250_rpm_put_tx);
 static void serial8250_set_sleep(struct uart_8250_port *p, int sleep)
 {
 	unsigned char lcr = 0, efr = 0;
-	/*
-	 * Exar UARTs have a SLEEP register that enables or disables
-	 * each UART to enter sleep mode separately.  On the XR17V35x the
-	 * register is accessible to each UART at the UART_EXAR_SLEEP
-	 * offset but the UART channel may only write to the corresponding
-	 * bit.
-	 */
+
 	serial8250_rpm_get(p);
-	if ((p->port.type == PORT_XR17V35X) ||
-	   (p->port.type == PORT_XR17D15X)) {
-		serial_out(p, UART_EXAR_SLEEP, sleep ? 0xff : 0);
-		goto out;
-	}
 
 	if (p->capabilities & UART_CAP_SLEEP) {
 		if (p->capabilities & UART_CAP_EFR) {
@@ -737,7 +725,7 @@ static void serial8250_set_sleep(struct uart_8250_port *p, int sleep)
 			serial_out(p, UART_LCR, lcr);
 		}
 	}
-out:
+
 	serial8250_rpm_put(p);
 }