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path: root/drivers/tty/serial/mcf.c
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Diffstat (limited to 'drivers/tty/serial/mcf.c')
-rw-r--r--drivers/tty/serial/mcf.c96
1 files changed, 89 insertions, 7 deletions
diff --git a/drivers/tty/serial/mcf.c b/drivers/tty/serial/mcf.c
index 3394b7cc172..a6f085717f9 100644
--- a/drivers/tty/serial/mcf.c
+++ b/drivers/tty/serial/mcf.c
@@ -23,6 +23,8 @@
#include <linux/serial.h>
#include <linux/serial_core.h>
#include <linux/io.h>
+#include <linux/uaccess.h>
+#include <linux/platform_device.h>
#include <asm/coldfire.h>
#include <asm/mcfsim.h>
#include <asm/mcfuart.h>
@@ -55,6 +57,7 @@ struct mcf_uart {
struct uart_port port;
unsigned int sigs; /* Local copy of line sigs */
unsigned char imr; /* Local IMR mirror */
+ struct serial_rs485 rs485; /* RS485 settings */
};
/****************************************************************************/
@@ -101,6 +104,12 @@ static void mcf_start_tx(struct uart_port *port)
{
struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
+ if (pp->rs485.flags & SER_RS485_ENABLED) {
+ /* Enable Transmitter */
+ writeb(MCFUART_UCR_TXENABLE, port->membase + MCFUART_UCR);
+ /* Manually assert RTS */
+ writeb(MCFUART_UOP_RTS, port->membase + MCFUART_UOP1);
+ }
pp->imr |= MCFUART_UIR_TXREADY;
writeb(pp->imr, port->membase + MCFUART_UIMR);
}
@@ -196,6 +205,7 @@ static void mcf_shutdown(struct uart_port *port)
static void mcf_set_termios(struct uart_port *port, struct ktermios *termios,
struct ktermios *old)
{
+ struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
unsigned long flags;
unsigned int baud, baudclk;
#if defined(CONFIG_M5272)
@@ -238,6 +248,12 @@ static void mcf_set_termios(struct uart_port *port, struct ktermios *termios,
mr1 |= MCFUART_MR1_PARITYNONE;
}
+ /*
+ * FIXME: port->read_status_mask and port->ignore_status_mask
+ * need to be initialized based on termios settings for
+ * INPCK, IGNBRK, IGNPAR, PARMRK, BRKINT
+ */
+
if (termios->c_cflag & CSTOPB)
mr2 |= MCFUART_MR2_STOP2;
else
@@ -248,6 +264,11 @@ static void mcf_set_termios(struct uart_port *port, struct ktermios *termios,
mr2 |= MCFUART_MR2_TXCTS;
}
+ if (pp->rs485.flags & SER_RS485_ENABLED) {
+ dev_dbg(port->dev, "Setting UART to RS485\n");
+ mr2 |= MCFUART_MR2_TXRTS;
+ }
+
spin_lock_irqsave(&port->lock, flags);
uart_update_timeout(port, termios->c_cflag, baud);
writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR);
@@ -310,7 +331,9 @@ static void mcf_rx_chars(struct mcf_uart *pp)
uart_insert_char(port, status, MCFUART_USR_RXOVERRUN, ch, flag);
}
- tty_flip_buffer_push(port->state->port.tty);
+ spin_unlock(&port->lock);
+ tty_flip_buffer_push(&port->state->port);
+ spin_lock(&port->lock);
}
/****************************************************************************/
@@ -342,6 +365,10 @@ static void mcf_tx_chars(struct mcf_uart *pp)
if (xmit->head == xmit->tail) {
pp->imr &= ~MCFUART_UIR_TXREADY;
writeb(pp->imr, port->membase + MCFUART_UIMR);
+ /* Disable TX to negate RTS automatically */
+ if (pp->rs485.flags & SER_RS485_ENABLED)
+ writeb(MCFUART_UCR_TXDISABLE,
+ port->membase + MCFUART_UCR);
}
}
@@ -380,7 +407,7 @@ static void mcf_config_port(struct uart_port *port, int flags)
/* Clear mask, so no surprise interrupts. */
writeb(0, port->membase + MCFUART_UIMR);
- if (request_irq(port->irq, mcf_interrupt, IRQF_DISABLED, "UART", port))
+ if (request_irq(port->irq, mcf_interrupt, 0, "UART", port))
printk(KERN_ERR "MCF: unable to attach ColdFire UART %d "
"interrupt vector=%d\n", port->line, port->irq);
}
@@ -418,6 +445,58 @@ static int mcf_verify_port(struct uart_port *port, struct serial_struct *ser)
/****************************************************************************/
+/* Enable or disable the RS485 support */
+static void mcf_config_rs485(struct uart_port *port, struct serial_rs485 *rs485)
+{
+ struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
+ unsigned long flags;
+ unsigned char mr1, mr2;
+
+ spin_lock_irqsave(&port->lock, flags);
+ /* Get mode registers */
+ mr1 = readb(port->membase + MCFUART_UMR);
+ mr2 = readb(port->membase + MCFUART_UMR);
+ if (rs485->flags & SER_RS485_ENABLED) {
+ dev_dbg(port->dev, "Setting UART to RS485\n");
+ /* Automatically negate RTS after TX completes */
+ mr2 |= MCFUART_MR2_TXRTS;
+ } else {
+ dev_dbg(port->dev, "Setting UART to RS232\n");
+ mr2 &= ~MCFUART_MR2_TXRTS;
+ }
+ writeb(mr1, port->membase + MCFUART_UMR);
+ writeb(mr2, port->membase + MCFUART_UMR);
+ pp->rs485 = *rs485;
+ spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static int mcf_ioctl(struct uart_port *port, unsigned int cmd,
+ unsigned long arg)
+{
+ switch (cmd) {
+ case TIOCSRS485: {
+ struct serial_rs485 rs485;
+ if (copy_from_user(&rs485, (struct serial_rs485 *)arg,
+ sizeof(struct serial_rs485)))
+ return -EFAULT;
+ mcf_config_rs485(port, &rs485);
+ break;
+ }
+ case TIOCGRS485: {
+ struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
+ if (copy_to_user((struct serial_rs485 *)arg, &pp->rs485,
+ sizeof(struct serial_rs485)))
+ return -EFAULT;
+ break;
+ }
+ default:
+ return -ENOIOCTLCMD;
+ }
+ return 0;
+}
+
+/****************************************************************************/
+
/*
* Define the basic serial functions we support.
*/
@@ -438,6 +517,7 @@ static const struct uart_ops mcf_uart_ops = {
.release_port = mcf_release_port,
.config_port = mcf_config_port,
.verify_port = mcf_verify_port,
+ .ioctl = mcf_ioctl,
};
static struct mcf_uart mcf_ports[4];
@@ -571,9 +651,9 @@ static struct uart_driver mcf_driver = {
/****************************************************************************/
-static int __devinit mcf_probe(struct platform_device *pdev)
+static int mcf_probe(struct platform_device *pdev)
{
- struct mcf_platform_uart *platp = pdev->dev.platform_data;
+ struct mcf_platform_uart *platp = dev_get_platdata(&pdev->dev);
struct uart_port *port;
int i;
@@ -599,7 +679,7 @@ static int __devinit mcf_probe(struct platform_device *pdev)
/****************************************************************************/
-static int __devexit mcf_remove(struct platform_device *pdev)
+static int mcf_remove(struct platform_device *pdev)
{
struct uart_port *port;
int i;
@@ -617,7 +697,7 @@ static int __devexit mcf_remove(struct platform_device *pdev)
static struct platform_driver mcf_platform_driver = {
.probe = mcf_probe,
- .remove = __devexit_p(mcf_remove),
+ .remove = mcf_remove,
.driver = {
.name = "mcfuart",
.owner = THIS_MODULE,
@@ -636,8 +716,10 @@ static int __init mcf_init(void)
if (rc)
return rc;
rc = platform_driver_register(&mcf_platform_driver);
- if (rc)
+ if (rc) {
+ uart_unregister_driver(&mcf_driver);
return rc;
+ }
return 0;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 20:34:49 +0000