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
--- a/drivers/tty/serial/8250.c
+++ b/drivers/tty/serial/8250.c
@@ -309,6 +309,13 @@
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)
@@ -1075,6 +1082,14 @@
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 @@
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