#include <linux/dma-mapping.h>
#include <linux/atmel_pdc.h>
#include <linux/atmel_serial.h>
+#include <linux/uaccess.h>
#include <asm/io.h>
+#include <asm/ioctls.h>
#include <asm/mach/serial_at91.h>
#include <mach/board.h>
#include <linux/serial_core.h>
+static void atmel_start_rx(struct uart_port *port);
+static void atmel_stop_rx(struct uart_port *port);
+
#ifdef CONFIG_SERIAL_ATMEL_TTYAT
/* Use device name ttyAT, major 204 and minor 154-169. This is necessary if we
#define UART_GET_BRGR(port) __raw_readl((port)->membase + ATMEL_US_BRGR)
#define UART_PUT_BRGR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_BRGR)
#define UART_PUT_RTOR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_RTOR)
+#define UART_PUT_TTGR(port, v) __raw_writel(v, (port)->membase + ATMEL_US_TTGR)
/* PDC registers */
#define UART_PUT_PTCR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_PTCR)
unsigned int irq_status_prev;
struct circ_buf rx_ring;
+
+ struct serial_rs485 rs485; /* rs485 settings */
+ unsigned int tx_done_mask;
};
static struct atmel_uart_port atmel_ports[ATMEL_MAX_UART];
}
#endif
+/* Enable or disable the rs485 support */
+void atmel_config_rs485(struct uart_port *port, struct serial_rs485 *rs485conf)
+{
+ struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+ unsigned int mode;
+
+ spin_lock(&port->lock);
+
+ /* Disable interrupts */
+ UART_PUT_IDR(port, atmel_port->tx_done_mask);
+
+ mode = UART_GET_MR(port);
+
+ /* Resetting serial mode to RS232 (0x0) */
+ mode &= ~ATMEL_US_USMODE;
+
+ atmel_port->rs485 = *rs485conf;
+
+ if (rs485conf->flags & SER_RS485_ENABLED) {
+ dev_dbg(port->dev, "Setting UART to RS485\n");
+ atmel_port->tx_done_mask = ATMEL_US_TXEMPTY;
+ UART_PUT_TTGR(port, rs485conf->delay_rts_before_send);
+ mode |= ATMEL_US_USMODE_RS485;
+ } else {
+ dev_dbg(port->dev, "Setting UART to RS232\n");
+ if (atmel_use_dma_tx(port))
+ atmel_port->tx_done_mask = ATMEL_US_ENDTX |
+ ATMEL_US_TXBUFE;
+ else
+ atmel_port->tx_done_mask = ATMEL_US_TXRDY;
+ }
+ UART_PUT_MR(port, mode);
+
+ /* Enable interrupts */
+ UART_PUT_IER(port, atmel_port->tx_done_mask);
+
+ spin_unlock(&port->lock);
+
+}
+
/*
* Return TIOCSER_TEMT when transmitter FIFO and Shift register is empty.
*/
{
unsigned int control = 0;
unsigned int mode;
+ struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
#ifdef CONFIG_ARCH_AT91RM9200
if (cpu_is_at91rm9200()) {
mode |= ATMEL_US_CHMODE_LOC_LOOP;
else
mode |= ATMEL_US_CHMODE_NORMAL;
+
+ /* Resetting serial mode to RS232 (0x0) */
+ mode &= ~ATMEL_US_USMODE;
+
+ if (atmel_port->rs485.flags & SER_RS485_ENABLED) {
+ dev_dbg(port->dev, "Setting UART to RS485\n");
+ UART_PUT_TTGR(port, atmel_port->rs485.delay_rts_before_send);
+ mode |= ATMEL_US_USMODE_RS485;
+ } else {
+ dev_dbg(port->dev, "Setting UART to RS232\n");
+ }
UART_PUT_MR(port, mode);
}
*/
static void atmel_stop_tx(struct uart_port *port)
{
+ struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+
if (atmel_use_dma_tx(port)) {
/* disable PDC transmit */
UART_PUT_PTCR(port, ATMEL_PDC_TXTDIS);
- UART_PUT_IDR(port, ATMEL_US_ENDTX | ATMEL_US_TXBUFE);
- } else
- UART_PUT_IDR(port, ATMEL_US_TXRDY);
+ }
+ /* Disable interrupts */
+ UART_PUT_IDR(port, atmel_port->tx_done_mask);
+
+ if (atmel_port->rs485.flags & SER_RS485_ENABLED)
+ atmel_start_rx(port);
}
/*
*/
static void atmel_start_tx(struct uart_port *port)
{
+ struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+
if (atmel_use_dma_tx(port)) {
if (UART_GET_PTSR(port) & ATMEL_PDC_TXTEN)
/* The transmitter is already running. Yes, we
really need this.*/
return;
- UART_PUT_IER(port, ATMEL_US_ENDTX | ATMEL_US_TXBUFE);
+ if (atmel_port->rs485.flags & SER_RS485_ENABLED)
+ atmel_stop_rx(port);
+
/* re-enable PDC transmit */
UART_PUT_PTCR(port, ATMEL_PDC_TXTEN);
- } else
- UART_PUT_IER(port, ATMEL_US_TXRDY);
+ }
+ /* Enable interrupts */
+ UART_PUT_IER(port, atmel_port->tx_done_mask);
+}
+
+/*
+ * start receiving - port is in process of being opened.
+ */
+static void atmel_start_rx(struct uart_port *port)
+{
+ UART_PUT_CR(port, ATMEL_US_RSTSTA); /* reset status and receiver */
+
+ if (atmel_use_dma_rx(port)) {
+ /* enable PDC controller */
+ UART_PUT_IER(port, ATMEL_US_ENDRX | ATMEL_US_TIMEOUT |
+ port->read_status_mask);
+ UART_PUT_PTCR(port, ATMEL_PDC_RXTEN);
+ } else {
+ UART_PUT_IER(port, ATMEL_US_RXRDY);
+ }
}
/*
if (atmel_use_dma_rx(port)) {
/* disable PDC receive */
UART_PUT_PTCR(port, ATMEL_PDC_RXTDIS);
- UART_PUT_IDR(port, ATMEL_US_ENDRX | ATMEL_US_TIMEOUT);
- } else
+ UART_PUT_IDR(port, ATMEL_US_ENDRX | ATMEL_US_TIMEOUT |
+ port->read_status_mask);
+ } else {
UART_PUT_IDR(port, ATMEL_US_RXRDY);
+ }
}
/*
static void atmel_tx_chars(struct uart_port *port)
{
struct circ_buf *xmit = &port->state->xmit;
+ struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
- if (port->x_char && UART_GET_CSR(port) & ATMEL_US_TXRDY) {
+ if (port->x_char && UART_GET_CSR(port) & atmel_port->tx_done_mask) {
UART_PUT_CHAR(port, port->x_char);
port->icount.tx++;
port->x_char = 0;
if (uart_circ_empty(xmit) || uart_tx_stopped(port))
return;
- while (UART_GET_CSR(port) & ATMEL_US_TXRDY) {
+ while (UART_GET_CSR(port) & atmel_port->tx_done_mask) {
UART_PUT_CHAR(port, xmit->buf[xmit->tail]);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
port->icount.tx++;
uart_write_wakeup(port);
if (!uart_circ_empty(xmit))
- UART_PUT_IER(port, ATMEL_US_TXRDY);
+ /* Enable interrupts */
+ UART_PUT_IER(port, atmel_port->tx_done_mask);
}
/*
{
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
- if (atmel_use_dma_tx(port)) {
- /* PDC transmit */
- if (pending & (ATMEL_US_ENDTX | ATMEL_US_TXBUFE)) {
- UART_PUT_IDR(port, ATMEL_US_ENDTX | ATMEL_US_TXBUFE);
- tasklet_schedule(&atmel_port->tasklet);
- }
- } else {
- /* Interrupt transmit */
- if (pending & ATMEL_US_TXRDY) {
- UART_PUT_IDR(port, ATMEL_US_TXRDY);
- tasklet_schedule(&atmel_port->tasklet);
- }
+ if (pending & atmel_port->tx_done_mask) {
+ /* Either PDC or interrupt transmission */
+ UART_PUT_IDR(port, atmel_port->tx_done_mask);
+ tasklet_schedule(&atmel_port->tasklet);
}
}
UART_PUT_TPR(port, pdc->dma_addr + xmit->tail);
UART_PUT_TCR(port, count);
- /* re-enable PDC transmit and interrupts */
+ /* re-enable PDC transmit */
UART_PUT_PTCR(port, ATMEL_PDC_TXTEN);
- UART_PUT_IER(port, ATMEL_US_ENDTX | ATMEL_US_TXBUFE);
+ /* Enable interrupts */
+ UART_PUT_IER(port, atmel_port->tx_done_mask);
+ } else {
+ if (atmel_port->rs485.flags & SER_RS485_ENABLED) {
+ /* DMA done, stop TX, start RX for RS485 */
+ atmel_start_rx(port);
+ }
}
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
if (status_change & ATMEL_US_CTS)
uart_handle_cts_change(port, !(status & ATMEL_US_CTS));
- wake_up_interruptible(&port->state->delta_msr_wait);
+ wake_up_interruptible(&port->state->port.delta_msr_wait);
atmel_port->irq_status_prev = status;
}
{
unsigned long flags;
unsigned int mode, imr, quot, baud;
+ struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
/* Get current mode register */
mode = UART_GET_MR(port) & ~(ATMEL_US_USCLKS | ATMEL_US_CHRL
/* disable receiver and transmitter */
UART_PUT_CR(port, ATMEL_US_TXDIS | ATMEL_US_RXDIS);
+ /* Resetting serial mode to RS232 (0x0) */
+ mode &= ~ATMEL_US_USMODE;
+
+ if (atmel_port->rs485.flags & SER_RS485_ENABLED) {
+ dev_dbg(port->dev, "Setting UART to RS485\n");
+ UART_PUT_TTGR(port, atmel_port->rs485.delay_rts_before_send);
+ mode |= ATMEL_US_USMODE_RS485;
+ } else {
+ dev_dbg(port->dev, "Setting UART to RS232\n");
+ }
+
/* set the parity, stop bits and data size */
UART_PUT_MR(port, mode);
return ret;
}
+#ifdef CONFIG_CONSOLE_POLL
+static int atmel_poll_get_char(struct uart_port *port)
+{
+ while (!(UART_GET_CSR(port) & ATMEL_US_RXRDY))
+ cpu_relax();
+
+ return UART_GET_CHAR(port);
+}
+
+static void atmel_poll_put_char(struct uart_port *port, unsigned char ch)
+{
+ while (!(UART_GET_CSR(port) & ATMEL_US_TXRDY))
+ cpu_relax();
+
+ UART_PUT_CHAR(port, ch);
+}
+#endif
+
+static int
+atmel_ioctl(struct uart_port *port, unsigned int cmd, unsigned long arg)
+{
+ struct serial_rs485 rs485conf;
+
+ switch (cmd) {
+ case TIOCSRS485:
+ if (copy_from_user(&rs485conf, (struct serial_rs485 *) arg,
+ sizeof(rs485conf)))
+ return -EFAULT;
+
+ atmel_config_rs485(port, &rs485conf);
+ break;
+
+ case TIOCGRS485:
+ if (copy_to_user((struct serial_rs485 *) arg,
+ &(to_atmel_uart_port(port)->rs485),
+ sizeof(rs485conf)))
+ return -EFAULT;
+ break;
+
+ default:
+ return -ENOIOCTLCMD;
+ }
+ return 0;
+}
+
+
+
static struct uart_ops atmel_pops = {
.tx_empty = atmel_tx_empty,
.set_mctrl = atmel_set_mctrl,
.config_port = atmel_config_port,
.verify_port = atmel_verify_port,
.pm = atmel_serial_pm,
+ .ioctl = atmel_ioctl,
+#ifdef CONFIG_CONSOLE_POLL
+ .poll_get_char = atmel_poll_get_char,
+ .poll_put_char = atmel_poll_put_char,
+#endif
};
/*
struct uart_port *port = &atmel_port->uart;
struct atmel_uart_data *data = pdev->dev.platform_data;
- port->iotype = UPIO_MEM;
- port->flags = UPF_BOOT_AUTOCONF;
- port->ops = &atmel_pops;
- port->fifosize = 1;
- port->line = pdev->id;
- port->dev = &pdev->dev;
-
+ port->iotype = UPIO_MEM;
+ port->flags = UPF_BOOT_AUTOCONF;
+ port->ops = &atmel_pops;
+ port->fifosize = 1;
+ port->line = pdev->id;
+ port->dev = &pdev->dev;
port->mapbase = pdev->resource[0].start;
port->irq = pdev->resource[1].start;
atmel_port->use_dma_rx = data->use_dma_rx;
atmel_port->use_dma_tx = data->use_dma_tx;
- if (atmel_use_dma_tx(port))
+ atmel_port->rs485 = data->rs485;
+ /* Use TXEMPTY for interrupt when rs485 else TXRDY or ENDTX|TXBUFE */
+ if (atmel_port->rs485.flags & SER_RS485_ENABLED)
+ atmel_port->tx_done_mask = ATMEL_US_TXEMPTY;
+ else if (atmel_use_dma_tx(port)) {
port->fifosize = PDC_BUFFER_SIZE;
+ atmel_port->tx_done_mask = ATMEL_US_ENDTX | ATMEL_US_TXBUFE;
+ } else {
+ atmel_port->tx_done_mask = ATMEL_US_TXRDY;
+ }
}
/*
static void atmel_console_write(struct console *co, const char *s, u_int count)
{
struct uart_port *port = &atmel_ports[co->index].uart;
+ struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
unsigned int status, imr;
unsigned int pdc_tx;
* First, save IMR and then disable interrupts
*/
imr = UART_GET_IMR(port);
- UART_PUT_IDR(port, ATMEL_US_RXRDY | ATMEL_US_TXRDY);
+ UART_PUT_IDR(port, ATMEL_US_RXRDY | atmel_port->tx_done_mask);
/* Store PDC transmit status and disable it */
pdc_tx = UART_GET_PTSR(port) & ATMEL_PDC_TXTEN;
void *data;
int ret;
- BUILD_BUG_ON(!is_power_of_2(ATMEL_SERIAL_RINGSIZE));
+ BUILD_BUG_ON(ATMEL_SERIAL_RINGSIZE & (ATMEL_SERIAL_RINGSIZE - 1));
port = &atmel_ports[pdev->id];
port->backup_imr = 0;
Code Review / linux-2.6.git / blobdiff