[PATCH 5/8] tty/serial: at91: add dtr control via gpio
Richard Genoud
richard.genoud at gmail.com
Fri Feb 7 09:59:12 EST 2014
On sam9x5, the USART controller doesn't handle DTR/DSR/DCD/RI signals,
so we have to control them via GPIO.
This patch permits to use a GPIO to control the DTR signal.
Signed-off-by: Richard Genoud <richard.genoud at gmail.com>
---
Documentation/devicetree/bindings/serial/atmel-usart.txt | 3 +++
arch/arm/mach-at91/at91rm9200_devices.c | 5 +++++
arch/arm/mach-at91/at91sam9260_devices.c | 7 +++++++
arch/arm/mach-at91/at91sam9261_devices.c | 4 ++++
arch/arm/mach-at91/at91sam9263_devices.c | 4 ++++
arch/arm/mach-at91/at91sam9g45_devices.c | 5 +++++
arch/arm/mach-at91/at91sam9rl_devices.c | 5 +++++
drivers/tty/serial/atmel_serial.c | 13 +++++++++++++
include/linux/platform_data/atmel.h | 1 +
9 files changed, 47 insertions(+)
diff --git a/Documentation/devicetree/bindings/serial/atmel-usart.txt b/Documentation/devicetree/bindings/serial/atmel-usart.txt
index 6c0898e4b58e..77d45c88b494 100644
--- a/Documentation/devicetree/bindings/serial/atmel-usart.txt
+++ b/Documentation/devicetree/bindings/serial/atmel-usart.txt
@@ -17,6 +17,8 @@ Optional properties:
function pin for the USART RTS feature. If unsure, don't specify this property.
- cts-gpios: specify a GPIO for CTS line. It will use specified PIO instead of the peripheral
function pin for the USART CTS feature. If unsure, don't specify this property.
+- dtr-gpios: specify a GPIO for DTR line. It will use specified PIO instead of the peripheral
+ function pin for the USART DTR feature. If unsure, don't specify this property.
- add dma bindings for dma transfer:
- dmas: DMA specifier, consisting of a phandle to DMA controller node,
memory peripheral interface and USART DMA channel ID, FIFO configuration.
@@ -39,6 +41,7 @@ Example:
atmel,use-dma-tx;
rts-gpios = <&pioD 15 0>;
cts-gpios = <&pioD 16 0>;
+ dtr-gpios = <&pioD 17 0>;
};
- use DMA:
diff --git a/arch/arm/mach-at91/at91rm9200_devices.c b/arch/arm/mach-at91/at91rm9200_devices.c
index 4688a85cabc4..d8523cc05157 100644
--- a/arch/arm/mach-at91/at91rm9200_devices.c
+++ b/arch/arm/mach-at91/at91rm9200_devices.c
@@ -924,6 +924,7 @@ static struct atmel_uart_data dbgu_data = {
.use_dma_rx = 0, /* DBGU not capable of receive DMA */
.rts_gpio = -EINVAL,
.cts_gpio = -EINVAL,
+ .dtr_gpio = -EINVAL,
};
static u64 dbgu_dmamask = DMA_BIT_MASK(32);
@@ -964,6 +965,7 @@ static struct atmel_uart_data uart0_data = {
.use_dma_rx = 1,
.rts_gpio = -EINVAL,
.cts_gpio = -EINVAL,
+ .dtr_gpio = -EINVAL,
};
static u64 uart0_dmamask = DMA_BIT_MASK(32);
@@ -1016,6 +1018,7 @@ static struct atmel_uart_data uart1_data = {
.use_dma_rx = 1,
.rts_gpio = -EINVAL,
.cts_gpio = -EINVAL,
+ .dtr_gpio = -EINVAL,
};
static u64 uart1_dmamask = DMA_BIT_MASK(32);
@@ -1069,6 +1072,7 @@ static struct atmel_uart_data uart2_data = {
.use_dma_rx = 1,
.rts_gpio = -EINVAL,
.cts_gpio = -EINVAL,
+ .dtr_gpio = -EINVAL,
};
static u64 uart2_dmamask = DMA_BIT_MASK(32);
@@ -1114,6 +1118,7 @@ static struct atmel_uart_data uart3_data = {
.use_dma_rx = 1,
.rts_gpio = -EINVAL,
.cts_gpio = -EINVAL,
+ .dtr_gpio = -EINVAL,
};
static u64 uart3_dmamask = DMA_BIT_MASK(32);
diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c
index 5e8f0d1add1d..b8e325b00e1a 100644
--- a/arch/arm/mach-at91/at91sam9260_devices.c
+++ b/arch/arm/mach-at91/at91sam9260_devices.c
@@ -821,6 +821,7 @@ static struct atmel_uart_data dbgu_data = {
.use_dma_rx = 0, /* DBGU not capable of receive DMA */
.rts_gpio = -EINVAL,
.cts_gpio = -EINVAL,
+ .dtr_gpio = -EINVAL,
};
static u64 dbgu_dmamask = DMA_BIT_MASK(32);
@@ -861,6 +862,7 @@ static struct atmel_uart_data uart0_data = {
.use_dma_rx = 1,
.rts_gpio = -EINVAL,
.cts_gpio = -EINVAL,
+ .dtr_gpio = -EINVAL,
};
static u64 uart0_dmamask = DMA_BIT_MASK(32);
@@ -914,6 +916,7 @@ static struct atmel_uart_data uart1_data = {
.use_dma_rx = 1,
.rts_gpio = -EINVAL,
.cts_gpio = -EINVAL,
+ .dtr_gpio = -EINVAL,
};
static u64 uart1_dmamask = DMA_BIT_MASK(32);
@@ -959,6 +962,7 @@ static struct atmel_uart_data uart2_data = {
.use_dma_rx = 1,
.rts_gpio = -EINVAL,
.cts_gpio = -EINVAL,
+ .dtr_gpio = -EINVAL,
};
static u64 uart2_dmamask = DMA_BIT_MASK(32);
@@ -1004,6 +1008,7 @@ static struct atmel_uart_data uart3_data = {
.use_dma_rx = 1,
.rts_gpio = -EINVAL,
.cts_gpio = -EINVAL,
+ .dtr_gpio = -EINVAL,
};
static u64 uart3_dmamask = DMA_BIT_MASK(32);
@@ -1049,6 +1054,7 @@ static struct atmel_uart_data uart4_data = {
.use_dma_rx = 1,
.rts_gpio = -EINVAL,
.cts_gpio = -EINVAL,
+ .dtr_gpio = -EINVAL,
};
static u64 uart4_dmamask = DMA_BIT_MASK(32);
@@ -1089,6 +1095,7 @@ static struct atmel_uart_data uart5_data = {
.use_dma_rx = 1,
.rts_gpio = -EINVAL,
.cts_gpio = -EINVAL,
+ .dtr_gpio = -EINVAL,
};
static u64 uart5_dmamask = DMA_BIT_MASK(32);
diff --git a/arch/arm/mach-at91/at91sam9261_devices.c b/arch/arm/mach-at91/at91sam9261_devices.c
index f0ccc835e331..3a05d9f09b0d 100644
--- a/arch/arm/mach-at91/at91sam9261_devices.c
+++ b/arch/arm/mach-at91/at91sam9261_devices.c
@@ -882,6 +882,7 @@ static struct atmel_uart_data dbgu_data = {
.use_dma_rx = 0, /* DBGU not capable of receive DMA */
.rts_gpio = -EINVAL,
.cts_gpio = -EINVAL,
+ .dtr_gpio = -EINVAL,
};
static u64 dbgu_dmamask = DMA_BIT_MASK(32);
@@ -922,6 +923,7 @@ static struct atmel_uart_data uart0_data = {
.use_dma_rx = 1,
.rts_gpio = -EINVAL,
.cts_gpio = -EINVAL,
+ .dtr_gpio = -EINVAL,
};
static u64 uart0_dmamask = DMA_BIT_MASK(32);
@@ -967,6 +969,7 @@ static struct atmel_uart_data uart1_data = {
.use_dma_rx = 1,
.rts_gpio = -EINVAL,
.cts_gpio = -EINVAL,
+ .dtr_gpio = -EINVAL,
};
static u64 uart1_dmamask = DMA_BIT_MASK(32);
@@ -1012,6 +1015,7 @@ static struct atmel_uart_data uart2_data = {
.use_dma_rx = 1,
.rts_gpio = -EINVAL,
.cts_gpio = -EINVAL,
+ .dtr_gpio = -EINVAL,
};
static u64 uart2_dmamask = DMA_BIT_MASK(32);
diff --git a/arch/arm/mach-at91/at91sam9263_devices.c b/arch/arm/mach-at91/at91sam9263_devices.c
index 1e696ceacfaf..d26255ba3907 100644
--- a/arch/arm/mach-at91/at91sam9263_devices.c
+++ b/arch/arm/mach-at91/at91sam9263_devices.c
@@ -1326,6 +1326,7 @@ static struct atmel_uart_data dbgu_data = {
.use_dma_rx = 0, /* DBGU not capable of receive DMA */
.rts_gpio = -EINVAL,
.cts_gpio = -EINVAL,
+ .dtr_gpio = -EINVAL,
};
static u64 dbgu_dmamask = DMA_BIT_MASK(32);
@@ -1366,6 +1367,7 @@ static struct atmel_uart_data uart0_data = {
.use_dma_rx = 1,
.rts_gpio = -EINVAL,
.cts_gpio = -EINVAL,
+ .dtr_gpio = -EINVAL,
};
static u64 uart0_dmamask = DMA_BIT_MASK(32);
@@ -1411,6 +1413,7 @@ static struct atmel_uart_data uart1_data = {
.use_dma_rx = 1,
.rts_gpio = -EINVAL,
.cts_gpio = -EINVAL,
+ .dtr_gpio = -EINVAL,
};
static u64 uart1_dmamask = DMA_BIT_MASK(32);
@@ -1456,6 +1459,7 @@ static struct atmel_uart_data uart2_data = {
.use_dma_rx = 1,
.rts_gpio = -EINVAL,
.cts_gpio = -EINVAL,
+ .dtr_gpio = -EINVAL,
};
static u64 uart2_dmamask = DMA_BIT_MASK(32);
diff --git a/arch/arm/mach-at91/at91sam9g45_devices.c b/arch/arm/mach-at91/at91sam9g45_devices.c
index b75eb826b803..67e9f7f259e1 100644
--- a/arch/arm/mach-at91/at91sam9g45_devices.c
+++ b/arch/arm/mach-at91/at91sam9g45_devices.c
@@ -1589,6 +1589,7 @@ static struct atmel_uart_data dbgu_data = {
.use_dma_rx = 0,
.rts_gpio = -EINVAL,
.cts_gpio = -EINVAL,
+ .dtr_gpio = -EINVAL,
};
static u64 dbgu_dmamask = DMA_BIT_MASK(32);
@@ -1629,6 +1630,7 @@ static struct atmel_uart_data uart0_data = {
.use_dma_rx = 1,
.rts_gpio = -EINVAL,
.cts_gpio = -EINVAL,
+ .dtr_gpio = -EINVAL,
};
static u64 uart0_dmamask = DMA_BIT_MASK(32);
@@ -1674,6 +1676,7 @@ static struct atmel_uart_data uart1_data = {
.use_dma_rx = 1,
.rts_gpio = -EINVAL,
.cts_gpio = -EINVAL,
+ .dtr_gpio = -EINVAL,
};
static u64 uart1_dmamask = DMA_BIT_MASK(32);
@@ -1719,6 +1722,7 @@ static struct atmel_uart_data uart2_data = {
.use_dma_rx = 1,
.rts_gpio = -EINVAL,
.cts_gpio = -EINVAL,
+ .dtr_gpio = -EINVAL,
};
static u64 uart2_dmamask = DMA_BIT_MASK(32);
@@ -1764,6 +1768,7 @@ static struct atmel_uart_data uart3_data = {
.use_dma_rx = 1,
.rts_gpio = -EINVAL,
.cts_gpio = -EINVAL,
+ .dtr_gpio = -EINVAL,
};
static u64 uart3_dmamask = DMA_BIT_MASK(32);
diff --git a/arch/arm/mach-at91/at91sam9rl_devices.c b/arch/arm/mach-at91/at91sam9rl_devices.c
index 67bf5811b38f..94fecc40dbba 100644
--- a/arch/arm/mach-at91/at91sam9rl_devices.c
+++ b/arch/arm/mach-at91/at91sam9rl_devices.c
@@ -958,6 +958,7 @@ static struct atmel_uart_data dbgu_data = {
.use_dma_rx = 0, /* DBGU not capable of receive DMA */
.rts_gpio = -EINVAL,
.cts_gpio = -EINVAL,
+ .dtr_gpio = -EINVAL,
};
static u64 dbgu_dmamask = DMA_BIT_MASK(32);
@@ -998,6 +999,7 @@ static struct atmel_uart_data uart0_data = {
.use_dma_rx = 1,
.rts_gpio = -EINVAL,
.cts_gpio = -EINVAL,
+ .dtr_gpio = -EINVAL,
};
static u64 uart0_dmamask = DMA_BIT_MASK(32);
@@ -1051,6 +1053,7 @@ static struct atmel_uart_data uart1_data = {
.use_dma_rx = 1,
.rts_gpio = -EINVAL,
.cts_gpio = -EINVAL,
+ .dtr_gpio = -EINVAL,
};
static u64 uart1_dmamask = DMA_BIT_MASK(32);
@@ -1096,6 +1099,7 @@ static struct atmel_uart_data uart2_data = {
.use_dma_rx = 1,
.rts_gpio = -EINVAL,
.cts_gpio = -EINVAL,
+ .dtr_gpio = -EINVAL,
};
static u64 uart2_dmamask = DMA_BIT_MASK(32);
@@ -1141,6 +1145,7 @@ static struct atmel_uart_data uart3_data = {
.use_dma_rx = 1,
.rts_gpio = -EINVAL,
.cts_gpio = -EINVAL,
+ .dtr_gpio = -EINVAL,
};
static u64 uart3_dmamask = DMA_BIT_MASK(32);
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 7a6b0506c050..f5bdb84aed53 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -133,6 +133,7 @@ struct gpio_lines {
int rts; /* optional RTS GPIO */
int cts; /* optional CTS GPIO */
int cts_irq;
+ int dtr; /* optional DTR GPIO */
};
/*
@@ -339,6 +340,13 @@ static void atmel_set_mctrl(struct uart_port *port, u_int mctrl)
else
control |= ATMEL_US_RTSDIS;
+ if (gpio_is_valid(atmel_port->gpio.dtr)) {
+ if (mctrl & TIOCM_DTR)
+ gpio_set_value(atmel_port->gpio.dtr, 0);
+ else
+ gpio_set_value(atmel_port->gpio.dtr, 1);
+ }
+
if (mctrl & TIOCM_DTR)
control |= ATMEL_US_DTREN;
else
@@ -2454,6 +2462,8 @@ static int atmel_init_gpios(struct atmel_uart_port *atmel_port,
"RTS", NULL);
ret += atmel_request_gpio(&pdev->dev, atmel_port->gpio.cts,
"CTS", &atmel_port->gpio.cts_irq);
+ ret += atmel_request_gpio(&pdev->dev, atmel_port->gpio.dtr,
+ "DTR", NULL);
return ret;
}
@@ -2494,13 +2504,16 @@ static int atmel_serial_probe(struct platform_device *pdev)
port->uart.line = ret;
port->gpio.rts = -EINVAL; /* Invalid, zero could be valid */
port->gpio.cts = -EINVAL;
+ port->gpio.dtr = -EINVAL;
port->gpio.cts_irq = INVALID_IRQ;
if (pdata) {
port->gpio.rts = pdata->rts_gpio;
port->gpio.cts = pdata->cts_gpio;
+ port->gpio.dtr = pdata->dtr_gpio;
} else if (np) {
port->gpio.rts = of_get_named_gpio(np, "rts-gpios", 0);
port->gpio.cts = of_get_named_gpio(np, "cts-gpios", 0);
+ port->gpio.dtr = of_get_named_gpio(np, "dtr-gpios", 0);
}
ret = atmel_init_gpios(port, pdev);
diff --git a/include/linux/platform_data/atmel.h b/include/linux/platform_data/atmel.h
index 166a99ca911f..8472b6f3c618 100644
--- a/include/linux/platform_data/atmel.h
+++ b/include/linux/platform_data/atmel.h
@@ -86,6 +86,7 @@ struct atmel_uart_data {
struct serial_rs485 rs485; /* rs485 settings */
int rts_gpio; /* optional RTS GPIO */
int cts_gpio; /* optional CTS GPIO */
+ int dtr_gpio; /* optional DTR GPIO */
};
/* Touchscreen Controller */
--
1.8.5
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