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authorDaniel Golle <daniel@makrotopia.org>2018-06-05 05:35:47 +0200
committerDaniel Golle <daniel@makrotopia.org>2018-06-05 15:27:36 +0200
commit187da94808a634477b5e5a69109ea0c566dfa64b (patch)
tree44cd192e639cdb11eea33d981addd29cf6f910fb /target/linux/generic
parent2f3b1dddeaef82ed8c69d697570ece5bd903f702 (diff)
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kernel: modules: package module for Exar 8250 UARTs
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Diffstat (limited to 'target/linux/generic')
-rw-r--r--target/linux/generic/pending-4.14/950-tty-serial-exar-generalize-rs485-setup.patch81
1 files changed, 81 insertions, 0 deletions
diff --git a/target/linux/generic/pending-4.14/950-tty-serial-exar-generalize-rs485-setup.patch b/target/linux/generic/pending-4.14/950-tty-serial-exar-generalize-rs485-setup.patch
new file mode 100644
index 0000000000..a2b740fd42
--- /dev/null
+++ b/target/linux/generic/pending-4.14/950-tty-serial-exar-generalize-rs485-setup.patch
@@ -0,0 +1,81 @@
+From 24d5ba8ad40c3ac7903f688580c345aafa764dc7 Mon Sep 17 00:00:00 2001
+From: Daniel Golle <daniel@makrotopia.org>
+Date: Mon, 4 Jun 2018 14:51:29 +0200
+Subject: [PATCH] tty: serial: exar: generalize rs485 setup
+To: linux-serial@vger.kernel.org,
+ Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+Cc: Linus Walleij <linus.walleij@linaro.org>,
+ Jan Kiszka <jan.kiszka@siemens.com>
+
+Move the non-board-specific part of the RS485 initialization
+from iot2040_rs485_config function to a new generic function
+used also for other boards.
+This allows using PCIe boards which are hard-wired to RS485
+or have jumpers for their configurations.
+
+Signed-off-by: Daniel Golle <daniel@makrotopia.org>
+---
+ drivers/tty/serial/8250/8250_exar.c | 38 +++++++++++++++++++----------
+ 1 file changed, 25 insertions(+), 13 deletions(-)
+
+diff --git a/drivers/tty/serial/8250/8250_exar.c b/drivers/tty/serial/8250/8250_exar.c
+index e0aa5f03004c..55b4d6d581f0 100644
+--- a/drivers/tty/serial/8250/8250_exar.c
++++ b/drivers/tty/serial/8250/8250_exar.c
+@@ -275,8 +275,32 @@ static int xr17v35x_register_gpio(struct pci_dev *pcidev,
+ return 0;
+ }
+
++static int generic_rs485_config(struct uart_port *port,
++ struct serial_rs485 *rs485)
++{
++ bool is_rs485 = !!(rs485->flags & SER_RS485_ENABLED);
++ u8 __iomem *p = port->membase;
++ u8 value;
++
++ value = readb(p + UART_EXAR_FCTR);
++ if (is_rs485)
++ value |= UART_FCTR_EXAR_485;
++ else
++ value &= ~UART_FCTR_EXAR_485;
++
++ writeb(value, p + UART_EXAR_FCTR);
++
++ if (is_rs485)
++ writeb(UART_EXAR_RS485_DLY(4), p + UART_MSR);
++
++ port->rs485 = *rs485;
++
++ return 0;
++}
++
+ static const struct exar8250_platform exar8250_default_platform = {
+ .register_gpio = xr17v35x_register_gpio,
++ .rs485_config = generic_rs485_config,
+ };
+
+ static int iot2040_rs485_config(struct uart_port *port,
+@@ -309,19 +333,7 @@ static int iot2040_rs485_config(struct uart_port *port,
+ value |= mode;
+ writeb(value, p + UART_EXAR_MPIOLVL_7_0);
+
+- value = readb(p + UART_EXAR_FCTR);
+- if (is_rs485)
+- value |= UART_FCTR_EXAR_485;
+- else
+- value &= ~UART_FCTR_EXAR_485;
+- writeb(value, p + UART_EXAR_FCTR);
+-
+- if (is_rs485)
+- writeb(UART_EXAR_RS485_DLY(4), p + UART_MSR);
+-
+- port->rs485 = *rs485;
+-
+- return 0;
++ return generic_rs485_config(port, rs485);
+ }
+
+ static const struct property_entry iot2040_gpio_properties[] = {
+--
+2.17.1
+