diff options
| author | Stephen Hurd <shurd@broadcom.com> | 2013-01-17 23:14:53 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-01-17 23:02:55 +0100 |
| commit | ebebd49a8eab5e9aa1b1f8f1614ccc3c2120f886 (patch) | |
| tree | d5f471e4bead7804b6db1ce7ab3b7a48ad795289 /drivers/tty/serial/8250/8250.c | |
| parent | pty: return EINVAL for TIOCGPTN for BSD ptys (diff) | |
| download | linux-ebebd49a8eab5e9aa1b1f8f1614ccc3c2120f886.tar.xz linux-ebebd49a8eab5e9aa1b1f8f1614ccc3c2120f886.zip | |
8250/16?50: Add support for Broadcom TruManage redirected serial port
Add support for the UART device present in Broadcom TruManage capable
NetXtreme chips (ie: 5761m 5762, and 5725).
This implementation has a hidden transmit FIFO, so running in single-byte
interrupt mode results in too many interrupts. The UART_CAP_HFIFO
capability was added to track this. It continues to reload the THR as long
as the THRE and TSRE bits are set in the LSR up to a specified limit (1024
is used here).
Signed-off-by: Stephen Hurd <shurd@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/8250/8250.c')
| -rw-r--r-- | drivers/tty/serial/8250/8250.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/tty/serial/8250/8250.c b/drivers/tty/serial/8250/8250.c index d085e3a8ec06..f9320437a649 100644 --- a/drivers/tty/serial/8250/8250.c +++ b/drivers/tty/serial/8250/8250.c @@ -300,6 +300,12 @@ static const struct serial8250_config uart_config[] = { UART_FCR_R_TRIG_00 | UART_FCR_T_TRIG_00, .flags = UART_CAP_FIFO, }, + [PORT_BRCM_TRUMANAGE] = { + .name = "TruManage", + .fifo_size = 1, + .tx_loadsz = 1024, + .flags = UART_CAP_HFIFO, + }, [PORT_8250_CIR] = { .name = "CIR port" } @@ -1490,6 +1496,11 @@ void serial8250_tx_chars(struct uart_8250_port *up) port->icount.tx++; if (uart_circ_empty(xmit)) break; + if (up->capabilities & UART_CAP_HFIFO) { + if ((serial_port_in(port, UART_LSR) & BOTH_EMPTY) != + BOTH_EMPTY) + break; + } } while (--count > 0); if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |