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authorWolfram Sang <w.sang@pengutronix.de>2008-12-21 02:54:32 -0700
committerGrant Likely <grant.likely@secretlab.ca>2008-12-21 02:54:32 -0700
commitaec739e010f8163eac225f4e331ac7fbd59ac5c8 (patch)
tree85b01751d95c1635d0825c02d43654444543fb21 /drivers/serial
parentb65149880d0467287fa4c7b4f19953392323f4ac (diff)
powerpc/mpc5200: add rts/cts handling in PSC UART driver
Add RTS/CTS-support for the PSC of the MPC5200B. Tested with a Phytec MPC5200B-IO. Signed-off-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/serial')
-rw-r--r--drivers/serial/mpc52xx_uart.c41
1 files changed, 37 insertions, 4 deletions
diff --git a/drivers/serial/mpc52xx_uart.c b/drivers/serial/mpc52xx_uart.c
index d82650d5439..d2a1fc29834 100644
--- a/drivers/serial/mpc52xx_uart.c
+++ b/drivers/serial/mpc52xx_uart.c
@@ -429,14 +429,24 @@ mpc52xx_uart_tx_empty(struct uart_port *port)
static void
mpc52xx_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
- /* Not implemented */
+ if (mctrl & TIOCM_RTS)
+ out_8(&PSC(port)->op1, MPC52xx_PSC_OP_RTS);
+ else
+ out_8(&PSC(port)->op0, MPC52xx_PSC_OP_RTS);
}
static unsigned int
mpc52xx_uart_get_mctrl(struct uart_port *port)
{
- /* Not implemented */
- return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
+ unsigned int ret = TIOCM_DSR;
+ u8 status = in_8(&PSC(port)->mpc52xx_psc_ipcr);
+
+ if (!(status & MPC52xx_PSC_CTS))
+ ret |= TIOCM_CTS;
+ if (!(status & MPC52xx_PSC_DCD))
+ ret |= TIOCM_CAR;
+
+ return ret;
}
static void
@@ -479,7 +489,15 @@ mpc52xx_uart_stop_rx(struct uart_port *port)
static void
mpc52xx_uart_enable_ms(struct uart_port *port)
{
- /* Not implemented */
+ struct mpc52xx_psc __iomem *psc = PSC(port);
+
+ /* clear D_*-bits by reading them */
+ in_8(&psc->mpc52xx_psc_ipcr);
+ /* enable CTS and DCD as IPC interrupts */
+ out_8(&psc->mpc52xx_psc_acr, MPC52xx_PSC_IEC_CTS | MPC52xx_PSC_IEC_DCD);
+
+ port->read_status_mask |= MPC52xx_PSC_IMR_IPC;
+ out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
}
static void
@@ -580,6 +598,10 @@ mpc52xx_uart_set_termios(struct uart_port *port, struct ktermios *new,
MPC52xx_PSC_MODE_ONE_STOP_5_BITS :
MPC52xx_PSC_MODE_ONE_STOP;
+ if (new->c_cflag & CRTSCTS) {
+ mr1 |= MPC52xx_PSC_MODE_RXRTS;
+ mr2 |= MPC52xx_PSC_MODE_TXCTS;
+ }
baud = uart_get_baud_rate(port, new, old, 0, port->uartclk/16);
quot = uart_get_divisor(port, baud);
@@ -617,6 +639,9 @@ mpc52xx_uart_set_termios(struct uart_port *port, struct ktermios *new,
out_8(&psc->ctur, ctr >> 8);
out_8(&psc->ctlr, ctr & 0xff);
+ if (UART_ENABLE_MS(port, new->c_cflag))
+ mpc52xx_uart_enable_ms(port);
+
/* Reenable TX & RX */
out_8(&psc->command, MPC52xx_PSC_TX_ENABLE);
out_8(&psc->command, MPC52xx_PSC_RX_ENABLE);
@@ -832,6 +857,7 @@ mpc52xx_uart_int(int irq, void *dev_id)
struct uart_port *port = dev_id;
unsigned long pass = ISR_PASS_LIMIT;
unsigned int keepgoing;
+ u8 status;
spin_lock(&port->lock);
@@ -848,6 +874,13 @@ mpc52xx_uart_int(int irq, void *dev_id)
if (psc_ops->tx_rdy(port))
keepgoing |= mpc52xx_uart_int_tx_chars(port);
+ status = in_8(&PSC(port)->mpc52xx_psc_ipcr);
+ if (status & MPC52xx_PSC_D_DCD)
+ uart_handle_dcd_change(port, !(status & MPC52xx_PSC_DCD));
+
+ if (status & MPC52xx_PSC_D_CTS)
+ uart_handle_cts_change(port, !(status & MPC52xx_PSC_CTS));
+
/* Limit number of iteration */
if (!(--pass))
keepgoing = 0;