linux-kernel - [PATCH v4 3/5] serial/8250_fintek: Support for chip

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Date:	Tue, 16 Jun 2015 10:59:38 +0200
From:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>, Alan Cox <alan@...ux.intel.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Peter Huewe <PeterHuewe@....de>, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org, peter_hong@...tek.com.tw
Cc:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Subject: [PATCH v4 3/5] serial/8250_fintek: Support for chip_ip 0x0501

There are some chips with the same interface but different chip ip.

Reported-by: Peter Hong <peter_hong@...tek.com.tw>
Reviewed-by: Alan Cox <alan@...ux.intel.com>
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
---
 drivers/tty/serial/8250/8250_fintek.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_fintek.c b/drivers/tty/serial/8250/8250_fintek.c
index 82b055b5a26d..2c3228e84a2e 100644
--- a/drivers/tty/serial/8250/8250_fintek.c
+++ b/drivers/tty/serial/8250/8250_fintek.c
@@ -22,9 +22,9 @@
 #define ENTRY_KEY 0x77
 #define EXIT_KEY 0xAA
 #define CHIP_ID1  0x20
-#define CHIP_ID1_VAL 0x02
 #define CHIP_ID2  0x21
-#define CHIP_ID2_VAL 0x16
+#define CHIP_ID_0 0x1602
+#define CHIP_ID_1 0x0501
 #define VENDOR_ID1 0x23
 #define VENDOR_ID1_VAL 0x19
 #define VENDOR_ID2 0x24
@@ -77,14 +77,7 @@ static int fintek_8250_get_index(resource_size_t base_addr)
 
 static int fintek_8250_check_id(u16 base_port)
 {
-
-	outb(CHIP_ID1, base_port + ADDR_PORT);
-	if (inb(base_port + DATA_PORT) != CHIP_ID1_VAL)
-		return -ENODEV;
-
-	outb(CHIP_ID2, base_port + ADDR_PORT);
-	if (inb(base_port + DATA_PORT) != CHIP_ID2_VAL)
-		return -ENODEV;
+	u16 chip;
 
 	outb(VENDOR_ID1, base_port + ADDR_PORT);
 	if (inb(base_port + DATA_PORT) != VENDOR_ID1_VAL)
@@ -94,6 +87,14 @@ static int fintek_8250_check_id(u16 base_port)
 	if (inb(base_port + DATA_PORT) != VENDOR_ID2_VAL)
 		return -ENODEV;
 
+	outb(CHIP_ID1, base_port + ADDR_PORT);
+	chip = inb(base_port + DATA_PORT);
+	outb(CHIP_ID2, base_port + ADDR_PORT);
+	chip |= inb(base_port + DATA_PORT) << 8;
+
+	if (chip != CHIP_ID_0 && chip != CHIP_ID_1)
+		return -ENODEV;
+
 	return 0;
 }
 
-- 
2.1.4

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