serial: pch_uart: support new device ML7213

Support ML7213 device of OKI SEMICONDUCTOR.
ML7213 is companion chip of Intel Atom E6xx series for IVI(In-Vehicle Infotainment).
ML7213 is completely compatible for Intel EG20T PCH.

Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 24 insertions, 8 deletions

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 2b8334601c8b..86e2c994d440 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -1596,4 +1596,9 @@ config SERIAL_PCH_UART
           This driver is for PCH(Platform controller Hub) UART of Intel EG20T
           which is an IOH(Input/Output Hub) for x86 embedded processor.
           Enabling PCH_DMA, this PCH UART works as DMA mode.
+
+          This driver also can be used for OKI SEMICONDUCTOR ML7213 IOH(Input/
+          Output Hub) which is for IVI(In-Vehicle Infotainment) use.
+          ML7213 is companion chip for Intel Atom E6xx series.
+          ML7213 is completely compatible for Intel EG20T PCH.
 endmenu
diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
index 70a61458ec42..3b2fb93e1fa1 100644
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -40,10 +40,11 @@ enum {
 
 #define PCH_UART_DRIVER_DEVICE "ttyPCH"
 
-#define PCH_UART_NR_GE_256FIFO          1
-#define PCH_UART_NR_GE_64FIFO           3
-#define PCH_UART_NR_GE  (PCH_UART_NR_GE_256FIFO+PCH_UART_NR_GE_64FIFO)
-#define PCH_UART_NR     PCH_UART_NR_GE
+/* Set the max number of UART port
+ * Intel EG20T PCH: 4 port
+ * OKI SEMICONDUCTOR ML7213 IOH: 3 port
+*/
+#define PCH_UART_NR     4
 
 #define PCH_UART_HANDLED_RX_INT (1<<((PCH_UART_HANDLED_RX_INT_SHIFT)<<1))
 #define PCH_UART_HANDLED_TX_INT (1<<((PCH_UART_HANDLED_TX_INT_SHIFT)<<1))
@@ -192,6 +193,8 @@ enum {
 #define PCH_UART_HAL_LOOP               (PCH_UART_MCR_LOOP)
 #define PCH_UART_HAL_AFE                (PCH_UART_MCR_AFE)
 
+#define PCI_VENDOR_ID_ROHM              0x10DB
+
 struct pch_uart_buffer {
         unsigned char *buf;
         int size;
@@ -1249,7 +1252,7 @@ static struct uart_driver pch_uart_driver = {
 };
 
 static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
-                                                int port_type)
+                                             const struct pci_device_id *id)
 {
         struct eg20t_port *priv;
         int ret;
@@ -1258,6 +1261,7 @@ static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
         unsigned char *rxbuf;
         int fifosize, base_baud;
         static int num;
+        int port_type = id->driver_data;
 
         priv = kzalloc(sizeof(struct eg20t_port), GFP_KERNEL);
         if (priv == NULL)
@@ -1269,11 +1273,11 @@ static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
 
         switch (port_type) {
         case PORT_UNKNOWN:
-                fifosize = 256; /* UART0 */
+                fifosize = 256; /* EG20T/ML7213: UART0 */
                 base_baud = 1843200; /* 1.8432MHz */
                 break;
         case PORT_8250:
-                fifosize = 64; /* UART1~3 */
+                fifosize = 64; /* EG20T:UART1~3  ML7213: UART1~2*/
                 base_baud = 1843200; /* 1.8432MHz */
                 break;
         default:
@@ -1307,6 +1311,7 @@ static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
 
         pci_set_drvdata(pdev, priv);
         pch_uart_hal_request(pdev, fifosize, base_baud);
+
         ret = uart_add_one_port(&pch_uart_driver, &priv->port);
         if (ret < 0)
                 goto init_port_hal_free;
@@ -1384,6 +1389,12 @@ static DEFINE_PCI_DEVICE_TABLE(pch_uart_pci_id) = {
          .driver_data = PCH_UART_2LINE},
         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8814),
          .driver_data = PCH_UART_2LINE},
+        {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8027),
+         .driver_data = PCH_UART_8LINE},
+        {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8028),
+         .driver_data = PCH_UART_2LINE},
+        {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8029),
+         .driver_data = PCH_UART_2LINE},
         {0,},
 };
 
@@ -1397,7 +1408,7 @@ static int __devinit pch_uart_pci_probe(struct pci_dev *pdev,
         if (ret < 0)
                 goto probe_error;
 
-        priv = pch_uart_init_port(pdev, id->driver_data);
+        priv = pch_uart_init_port(pdev, id);
         if (!priv) {
                 ret = -EBUSY;
                 goto probe_disable_device;