From 90a2f98b16a1889f6eb21540aba1244f9cf4f4ed Mon Sep 17 00:00:00 2001
From: Russell King <rmk@flint.arm.linux.org.uk>
Date: Tue, 11 Mar 2003 22:24:53 +0000
Subject: [PATCH] [SERIAL] Add PCI serial power management support.

---
 drivers/serial/8250.c     | 28 +++++++++++++++++++++-
 drivers/serial/8250.h     |  2 ++
 drivers/serial/8250_pci.c | 50 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 79 insertions(+), 1 deletion(-)

diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index be094804cf798..3b719f893e558 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -93,13 +93,15 @@ unsigned int share_irqs = SERIAL8250_SHARE_IRQS;
 #ifdef CONFIG_SERIAL_8250_MULTIPORT
 #define CONFIG_SERIAL_MULTIPORT 1
 #endif
+#ifdef CONFIG_SERIAL_8250_MANY_PORTS
+#define CONFIG_SERIAL_MANY_PORTS 1
+#endif
 
 /*
  * HUB6 is always on.  This will be removed once the header
  * files have been cleaned.
  */
 #define CONFIG_HUB6 1
-#define CONFIG_SERIAL_MANY_PORTS 1
 
 #include <asm/serial.h>
 
@@ -2094,6 +2096,28 @@ void serial8250_get_irq_map(unsigned int *map)
 	}
 }
 
+/**
+ *	serial8250_suspend_port - suspend one serial port
+ *	@line: serial line number
+ *
+ *	Suspend one serial port.
+ */
+void serial8250_suspend_port(int line, u32 level)
+{
+	uart_suspend_port(&serial8250_reg, &serial8250_ports[line].port, level);
+}
+
+/**
+ *	serial8250_resume_port - resume one serial port
+ *	@line: serial line number
+ *
+ *	Resume one serial port.
+ */
+void serial8250_resume_port(int line, u32 level)
+{
+	uart_resume_port(&serial8250_reg, &serial8250_ports[line].port, level);
+}
+
 static int __init serial8250_init(void)
 {
 	int ret, i;
@@ -2127,6 +2151,8 @@ module_exit(serial8250_exit);
 EXPORT_SYMBOL(register_serial);
 EXPORT_SYMBOL(unregister_serial);
 EXPORT_SYMBOL(serial8250_get_irq_map);
+EXPORT_SYMBOL(serial8250_suspend_port);
+EXPORT_SYMBOL(serial8250_resume_port);
 
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Generic 8250/16x50 serial driver $Revision: 1.90 $");
diff --git a/drivers/serial/8250.h b/drivers/serial/8250.h
index 030116e6ebf69..cc206f9476acf 100644
--- a/drivers/serial/8250.h
+++ b/drivers/serial/8250.h
@@ -27,6 +27,8 @@ struct serial8250_probe {
 int serial8250_register_probe(struct serial8250_probe *probe);
 void serial8250_unregister_probe(struct serial8250_probe *probe);
 void serial8250_get_irq_map(unsigned int *map);
+void serial8250_suspend_port(int line, u32 level);
+void serial8250_resume_port(int line, u32 level);
 
 struct old_serial_port {
 	unsigned int uart;
diff --git a/drivers/serial/8250_pci.c b/drivers/serial/8250_pci.c
index b0711e53f4719..1123ebd9fe30b 100644
--- a/drivers/serial/8250_pci.c
+++ b/drivers/serial/8250_pci.c
@@ -1592,6 +1592,53 @@ static void __devexit pciserial_remove_one(struct pci_dev *dev)
 	}
 }
 
+static int pciserial_save_state_one(struct pci_dev *dev, u32 state)
+{
+	struct serial_private *priv = pci_get_drvdata(dev);
+
+	if (priv) {
+		int i;
+
+		for (i = 0; i < priv->nr; i++)
+			serial8250_suspend_port(priv->line[i], SUSPEND_SAVE_STATE);
+	}
+	return 0;
+}
+
+static int pciserial_suspend_one(struct pci_dev *dev, u32 state)
+{
+	struct serial_private *priv = pci_get_drvdata(dev);
+
+	if (priv) {
+		int i;
+
+		for (i = 0; i < priv->nr; i++)
+			serial8250_suspend_port(priv->line[i], SUSPEND_POWER_DOWN);
+	}
+	return 0;
+}
+
+static int pciserial_resume_one(struct pci_dev *dev)
+{
+	struct serial_private *priv = pci_get_drvdata(dev);
+
+	if (priv) {
+		int i;
+
+		/*
+		 * Ensure that the board is correctly configured.
+		 */
+		if (priv->quirk->init)
+			priv->quirk->init(dev);
+
+		for (i = 0; i < priv->nr; i++) {
+			serial8250_resume_port(priv->line[i], RESUME_POWER_ON);
+			serial8250_resume_port(priv->line[i], RESUME_RESTORE_STATE);
+		}
+	}
+	return 0;
+}
+
 static struct pci_device_id serial_pci_tbl[] __devinitdata = {
 	{	PCI_VENDOR_ID_V3, PCI_DEVICE_ID_V3_V960,
 		PCI_SUBVENDOR_ID_CONNECT_TECH,
@@ -1986,6 +2033,9 @@ static struct pci_driver serial_pci_driver = {
 	.name		= "serial",
 	.probe		= pciserial_init_one,
 	.remove		= __devexit_p(pciserial_remove_one),
+	.save_state	= pciserial_save_state_one,
+	.suspend	= pciserial_suspend_one,
+	.resume		= pciserial_resume_one,
 	.id_table	= serial_pci_tbl,
 	.driver = {
 		.devclass = &tty_devclass,
-- 
2.53.0