serial: Support the EFR-register of XR1715x uarts.

The EFR (Enhenced-Features-Register) is located at a different offset
than the other devices supporting UART_CAP_EFR. This change add a special
setup quick to set UPF_EXAR_EFR on the port. UPF_EXAR_EFR is then used to
the port type to PORT_XR17D15X since it is for sure a XR17D15X uart.

Signed-off-by: Søren Holm <sgh@sgh.dk>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/tty/serial/8250.c b/drivers/tty/serial/8250.c
index 435ce14..82ca71a 100644 (file)
--- a/drivers/tty/serial/8250.c
+++ b/drivers/tty/serial/8250.c
@@ -309,6 +309,13 @@ static const struct serial8250_config uart_config[] = {
                                  UART_FCR_T_TRIG_01,
                .flags          = UART_CAP_FIFO | UART_CAP_RTOIE,
        },
+       [PORT_XR17D15X] = {
+               .name           = "XR17D15X",
+               .fifo_size      = 64,
+               .tx_loadsz      = 64,
+               .fcr            = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
+               .flags          = UART_CAP_FIFO | UART_CAP_AFE | UART_CAP_EFR,
+       },
 };
 
 #if defined(CONFIG_MIPS_ALCHEMY)
@@ -1074,6 +1081,14 @@ static void autoconfig_16550a(struct uart_8250_port *up)
        }
        serial_outp(up, UART_IER, iersave);
 
+       /*
+        * Exar uarts have EFR in a weird location
+        */
+       if (up->port.flags & UPF_EXAR_EFR) {
+               up->port.type = PORT_XR17D15X;
+               up->capabilities |= UART_CAP_AFE | UART_CAP_EFR;
+       }
+
        /*
         * We distinguish between 16550A and U6 16550A by counting
         * how many bytes are in the FIFO.
@@ -2417,7 +2432,10 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
                        efr |= UART_EFR_CTS;
 
                serial_outp(up, UART_LCR, UART_LCR_CONF_MODE_B);
-               serial_outp(up, UART_EFR, efr);
+               if (up->port.flags & UPF_EXAR_EFR)
+                       serial_outp(up, UART_XR_EFR, efr);
+               else
+                       serial_outp(up, UART_EFR, efr);
        }
 
 #ifdef CONFIG_ARCH_OMAP

diff --git a/drivers/tty/serial/8250_pci.c b/drivers/tty/serial/8250_pci.c
index 6b887d9..a79caba 100644 (file)
--- a/drivers/tty/serial/8250_pci.c
+++ b/drivers/tty/serial/8250_pci.c
@@ -1101,6 +1101,15 @@ static int pci_eg20t_init(struct pci_dev *dev)
 #endif
 }
 
+static int
+pci_xr17c154_setup(struct serial_private *priv,
+                 const struct pciserial_board *board,
+                 struct uart_port *port, int idx)
+{
+       port->flags |= UPF_EXAR_EFR;
+       return pci_default_setup(priv, board, port, idx);
+}
+
 /* This should be in linux/pci_ids.h */
 #define PCI_VENDOR_ID_SBSMODULARIO     0x124B
 #define PCI_SUBVENDOR_ID_SBSMODULARIO  0x124B
@@ -1505,6 +1514,30 @@ static struct pci_serial_quirk pci_serial_quirks[] __refdata = {
                .subdevice      = PCI_ANY_ID,
                .setup          = pci_timedia_setup,
        },
+       /*
+        * Exar cards
+        */
+       {
+               .vendor = PCI_VENDOR_ID_EXAR,
+               .device = PCI_DEVICE_ID_EXAR_XR17C152,
+               .subvendor      = PCI_ANY_ID,
+               .subdevice      = PCI_ANY_ID,
+               .setup          = pci_xr17c154_setup,
+       },
+       {
+               .vendor = PCI_VENDOR_ID_EXAR,
+               .device = PCI_DEVICE_ID_EXAR_XR17C154,
+               .subvendor      = PCI_ANY_ID,
+               .subdevice      = PCI_ANY_ID,
+               .setup          = pci_xr17c154_setup,
+       },
+       {
+               .vendor = PCI_VENDOR_ID_EXAR,
+               .device = PCI_DEVICE_ID_EXAR_XR17C158,
+               .subvendor      = PCI_ANY_ID,
+               .subdevice      = PCI_ANY_ID,
+               .setup          = pci_xr17c154_setup,
+       },
        /*
         * Xircom cards
         */

diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 493773e..eadf33d 100644 (file)
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -46,7 +46,8 @@
 #define PORT_AR7       18      /* Texas Instruments AR7 internal UART */
 #define PORT_U6_16550A 19      /* ST-Ericsson U6xxx internal UART */
 #define PORT_TEGRA     20      /* NVIDIA Tegra internal UART */
-#define PORT_MAX_8250  20      /* max port ID */
+#define PORT_XR17D15X  21      /* Exar XR17D15x UART */
+#define PORT_MAX_8250  21      /* max port ID */
 
 /*
  * ARM specific type numbers.  These are not currently guaranteed
@@ -349,6 +350,7 @@ struct uart_port {
 #define UPF_MAGIC_MULTIPLIER   ((__force upf_t) (1 << 16))
 #define UPF_CONS_FLOW          ((__force upf_t) (1 << 23))
 #define UPF_SHARE_IRQ          ((__force upf_t) (1 << 24))
+#define UPF_EXAR_EFR           ((__force upf_t) (1 << 25))
 /* The exact UART type is known and should not be probed.  */
 #define UPF_FIXED_TYPE         ((__force upf_t) (1 << 27))
 #define UPF_BOOT_AUTOCONF      ((__force upf_t) (1 << 28))

diff --git a/include/linux/serial_reg.h b/include/linux/serial_reg.h
index c75bda3..8ce70d7 100644 (file)
--- a/include/linux/serial_reg.h
+++ b/include/linux/serial_reg.h
@@ -152,6 +152,7 @@
  * LCR=0xBF (or DLAB=1 for 16C660)
  */
 #define UART_EFR       2       /* I/O: Extended Features Register */
+#define UART_XR_EFR    9       /* I/O: Extended Features Register (XR17D15x) */
 #define UART_EFR_CTS           0x80 /* CTS flow control */
 #define UART_EFR_RTS           0x40 /* RTS flow control */
 #define UART_EFR_SCD           0x20 /* Special character detect */