mirror of
https://github.com/FUjr/gl-infra-builder.git
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103 lines
3.4 KiB
Diff
103 lines
3.4 KiB
Diff
From d5bdb37fd02b420cc6a682bf9e51e7e50658c85b Mon Sep 17 00:00:00 2001
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From: "GL.iNet-Hongjian.Zhang" <hongjian.zhang@gl-inet.com>
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Date: Sat, 18 Sep 2021 14:44:13 +0800
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Subject: [PATCH 4/8] add RS485 support
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---
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.../821-fix-glinet-rs485-auto-txrx.patch | 83 +++++++++++++++++++
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1 file changed, 83 insertions(+)
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create mode 100644 target/linux/ath79/patches-5.4/821-fix-glinet-rs485-auto-txrx.patch
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diff --git a/target/linux/ath79/patches-5.4/821-fix-glinet-rs485-auto-txrx.patch b/target/linux/ath79/patches-5.4/821-fix-glinet-rs485-auto-txrx.patch
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new file mode 100644
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index 0000000000..2030cad53d
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--- /dev/null
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+++ b/target/linux/ath79/patches-5.4/821-fix-glinet-rs485-auto-txrx.patch
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@@ -0,0 +1,83 @@
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+Index: b/drivers/tty/serial/8250/8250.h
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+===================================================================
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+--- a/drivers/tty/serial/8250/8250.h 2021-08-26 20:55:22.000000000 +0800
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++++ b/drivers/tty/serial/8250/8250.h 2021-09-18 14:30:46.200708724 +0800
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+@@ -13,6 +13,8 @@
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+
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+ #include "../serial_mctrl_gpio.h"
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+
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++extern unsigned int rs485txen_gpio;
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++
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+ struct uart_8250_dma {
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+ int (*tx_dma)(struct uart_8250_port *p);
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+ int (*rx_dma)(struct uart_8250_port *p);
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+Index: b/drivers/tty/serial/8250/8250_of.c
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+===================================================================
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+--- a/drivers/tty/serial/8250/8250_of.c 2021-08-26 20:55:22.000000000 +0800
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++++ b/drivers/tty/serial/8250/8250_of.c 2021-09-18 14:41:02.964067786 +0800
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+@@ -205,6 +205,7 @@ err_pmruntime:
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+ /*
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+ * Try to register a serial port
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+ */
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++unsigned int rs485txen_gpio = 0xff;
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+ static int of_platform_serial_probe(struct platform_device *ofdev)
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+ {
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+ struct of_serial_info *info;
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+@@ -246,6 +247,10 @@ static int of_platform_serial_probe(stru
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+ &port8250.overrun_backoff_time_ms) != 0)
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+ port8250.overrun_backoff_time_ms = 0;
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+
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++ if(!of_property_read_u32(ofdev->dev.of_node,"rs485_pin",&rs485txen_gpio)){
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++ pr_info("Serial port to 485 enable,rs485txen_gpio = gpio%d \n",rs485txen_gpio);
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++ }
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++
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+ ret = serial8250_register_8250_port(&port8250);
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+ if (ret < 0)
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+ goto err_dispose;
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+Index: b/drivers/tty/serial/8250/8250_port.c
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+===================================================================
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+--- a/drivers/tty/serial/8250/8250_port.c 2021-08-26 20:55:22.000000000 +0800
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++++ b/drivers/tty/serial/8250/8250_port.c 2021-09-18 14:36:49.548608917 +0800
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+@@ -34,6 +34,7 @@
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+ #include <linux/uaccess.h>
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+ #include <linux/pm_runtime.h>
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+ #include <linux/ktime.h>
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++#include <linux/gpio/consumer.h>
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+
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+ #include <asm/io.h>
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+ #include <asm/irq.h>
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+@@ -1463,10 +1464,22 @@ static void __stop_tx_rs485(struct uart_
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+ }
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+ }
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+
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++static unsigned int serial8250_tx_empty(struct uart_port *port);
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+ static inline void __do_stop_tx(struct uart_8250_port *p)
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+ {
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+- if (serial8250_clear_THRI(p))
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++ if (serial8250_clear_THRI(p)){
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++
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+ serial8250_rpm_put_tx(p);
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++
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++ if(0xff != rs485txen_gpio){
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++
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++ while(!serial8250_tx_empty(&(p->port))){
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++
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++ ;
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++ }
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++ gpiod_set_value(gpio_to_desc(rs485txen_gpio),0);
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++ }
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++ }
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+ }
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+
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+ static inline void __stop_tx(struct uart_8250_port *p)
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+@@ -1510,6 +1523,10 @@ static void serial8250_stop_tx(struct ua
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+
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+ static inline void __start_tx(struct uart_port *port)
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+ {
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++ if(0xff != rs485txen_gpio){
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++ gpiod_set_value(gpio_to_desc(rs485txen_gpio),1);
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++ }
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++
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+ struct uart_8250_port *up = up_to_u8250p(port);
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+
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+ if (up->dma && !up->dma->tx_dma(up))
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--
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2.17.1
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