*
* Based on 8250_lpc18xx.c:
* Copyright (C) 2015 Joachim Eastwood <manabian@gmail.com>
+ *
+ * The bcm2835aux is capable of RTS auto flow-control, but this driver doesn't
+ * take advantage of it yet. When adding support, be sure not to enable it
+ * simultaneously to rs485.
*/
#include <linux/clk.h>
#include "8250.h"
+#define BCM2835_AUX_UART_CNTL 8
+#define BCM2835_AUX_UART_CNTL_RXEN 0x01 /* Receiver enable */
+#define BCM2835_AUX_UART_CNTL_TXEN 0x02 /* Transmitter enable */
+#define BCM2835_AUX_UART_CNTL_AUTORTS 0x04 /* RTS set by RX fill level */
+#define BCM2835_AUX_UART_CNTL_AUTOCTS 0x08 /* CTS stops transmitter */
+#define BCM2835_AUX_UART_CNTL_RTS3 0x00 /* RTS set until 3 chars left */
+#define BCM2835_AUX_UART_CNTL_RTS2 0x10 /* RTS set until 2 chars left */
+#define BCM2835_AUX_UART_CNTL_RTS1 0x20 /* RTS set until 1 chars left */
+#define BCM2835_AUX_UART_CNTL_RTS4 0x30 /* RTS set until 4 chars left */
+#define BCM2835_AUX_UART_CNTL_RTSINV 0x40 /* Invert auto RTS polarity */
+#define BCM2835_AUX_UART_CNTL_CTSINV 0x80 /* Invert auto CTS polarity */
+
/**
* struct bcm2835aux_data - driver private data of BCM2835 auxiliary UART
* @clk: clock producer of the port's uartclk
* @line: index of the port's serial8250_ports[] entry
+ * @cntl: cached copy of CNTL register
*/
struct bcm2835aux_data {
struct clk *clk;
int line;
+ u32 cntl;
};
+static void bcm2835aux_rs485_start_tx(struct uart_8250_port *up)
+{
+ if (!(up->port.rs485.flags & SER_RS485_RX_DURING_TX)) {
+ struct bcm2835aux_data *data = dev_get_drvdata(up->port.dev);
+
+ data->cntl &= ~BCM2835_AUX_UART_CNTL_RXEN;
+ serial_out(up, BCM2835_AUX_UART_CNTL, data->cntl);
+ }
+
+ /*
+ * On the bcm2835aux, the MCR register contains no other
+ * flags besides RTS. So no need for a read-modify-write.
+ */
+ if (up->port.rs485.flags & SER_RS485_RTS_ON_SEND)
+ serial8250_out_MCR(up, 0);
+ else
+ serial8250_out_MCR(up, UART_MCR_RTS);
+}
+
+static void bcm2835aux_rs485_stop_tx(struct uart_8250_port *up)
+{
+ if (up->port.rs485.flags & SER_RS485_RTS_AFTER_SEND)
+ serial8250_out_MCR(up, 0);
+ else
+ serial8250_out_MCR(up, UART_MCR_RTS);
+
+ if (!(up->port.rs485.flags & SER_RS485_RX_DURING_TX)) {
+ struct bcm2835aux_data *data = dev_get_drvdata(up->port.dev);
+
+ data->cntl |= BCM2835_AUX_UART_CNTL_RXEN;
+ serial_out(up, BCM2835_AUX_UART_CNTL, data->cntl);
+ }
+}
+
static int bcm2835aux_serial_probe(struct platform_device *pdev)
{
struct uart_8250_port up = { };
up.port.fifosize = 8;
up.port.flags = UPF_SHARE_IRQ | UPF_FIXED_PORT | UPF_FIXED_TYPE |
UPF_SKIP_TEST | UPF_IOREMAP;
+ up.port.rs485_config = serial8250_em485_config;
+ up.rs485_start_tx = bcm2835aux_rs485_start_tx;
+ up.rs485_stop_tx = bcm2835aux_rs485_stop_tx;
+
+ /* initialize cached copy with power-on reset value */
+ data->cntl = BCM2835_AUX_UART_CNTL_RXEN | BCM2835_AUX_UART_CNTL_TXEN;
+
+ platform_set_drvdata(pdev, data);
/* get the clock - this also enables the HW */
data->clk = devm_clk_get(&pdev->dev, NULL);
}
data->line = ret;
- platform_set_drvdata(pdev, data);
-
return 0;
dis_clk: