[PATCH] Perle multimodem card (PCI-RAS) detection

Get the Perle quad-modem PCI card (PCI-RAS4) detected by serial driver. It
may also get the PCI-RAS8 running, but can't guarantee as I didn't had one for
testing.

Signed-off-by: Thomas Hoehn <[e-mail]>
Cc: Russell King <[e-mail]>
Cc: Alan Cox <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/serial/8250.c

···
 #ifdef __i386__
 		outb(0xff, 0x080);
 #endif
-		scratch2 = serial_inp(up, UART_IER);
+		/*
+		 * Mask out IER[7:4] bits for test as some UARTs (e.g. TL
+		 * 16C754B) allow only to modify them if an EFR bit is set.
+		 */
+		scratch2 = serial_inp(up, UART_IER) & 0x0f;
 		serial_outp(up, UART_IER, 0x0F);
 #ifdef __i386__
 		outb(0, 0x080);
 #endif
-		scratch3 = serial_inp(up, UART_IER);
+		scratch3 = serial_inp(up, UART_IER) & 0x0f;
 		serial_outp(up, UART_IER, scratch);
 		if (scratch2 != 0 || scratch3 != 0x0F) {
 			/*

drivers/serial/8250_pci.c

···
 	 */
 	{
 		.vendor		= PCI_VENDOR_ID_PLX,
+		.device		= PCI_DEVICE_ID_PLX_9030,
+		.subvendor	= PCI_SUBVENDOR_ID_PERLE,
+		.subdevice	= PCI_ANY_ID,
+		.setup		= pci_default_setup,
+	},
+	{
+		.vendor		= PCI_VENDOR_ID_PLX,
 		.device		= PCI_DEVICE_ID_PLX_9050,
 		.subvendor	= PCI_SUBVENDOR_ID_EXSYS,
 		.subdevice	= PCI_SUBDEVICE_ID_EXSYS_4055,
···
 		PCI_ANY_ID, PCI_ANY_ID, 0, 0,	/* 135a.0811 */
 		pbn_b2_2_115200 },
 
+	/*
+	 * Perle PCI-RAS cards
+	 */
+	{       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9030,
+		PCI_SUBVENDOR_ID_PERLE, PCI_SUBDEVICE_ID_PCI_RAS4,
+		0, 0, pbn_b2_4_921600 },
+	{       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9030,
+		PCI_SUBVENDOR_ID_PERLE, PCI_SUBDEVICE_ID_PCI_RAS8,
+		0, 0, pbn_b2_8_921600 },
 	/*
 	 * These entries match devices with class COMMUNICATION_SERIAL,
 	 * COMMUNICATION_MODEM or COMMUNICATION_MULTISERIAL

include/linux/pci_ids.h

···
 #define PCI_DEVICE_ID_PLX_R753		0x1152
 #define PCI_DEVICE_ID_PLX_OLITEC	0x1187
 #define PCI_DEVICE_ID_PLX_PCI200SYN	0x3196
+#define PCI_DEVICE_ID_PLX_9030          0x9030
 #define PCI_DEVICE_ID_PLX_9050		0x9050
 #define PCI_DEVICE_ID_PLX_9080		0x9080
 #define PCI_DEVICE_ID_PLX_GTEK_SERIAL2	0xa001
···
 #define PCI_DEVICE_ID_ENE_722		0x1422
 
 #define PCI_VENDOR_ID_CHELSIO		0x1425
+
+#define PCI_SUBVENDOR_ID_PERLE          0x155f
+#define PCI_SUBDEVICE_ID_PCI_RAS4       0xf001
+#define PCI_SUBDEVICE_ID_PCI_RAS8       0xf010
 
 
 #define PCI_VENDOR_ID_SYBA		0x1592