diff options
Diffstat (limited to 'drivers/tty/serial/8250.c')
| -rw-r--r-- | drivers/tty/serial/8250.c | 46 |
1 files changed, 41 insertions, 5 deletions
diff --git a/drivers/tty/serial/8250.c b/drivers/tty/serial/8250.c index b3b881bc471..b40f7b90c81 100644 --- a/drivers/tty/serial/8250.c +++ b/drivers/tty/serial/8250.c @@ -1,6 +1,4 @@ /* - * linux/drivers/char/8250.c - * * Driver for 8250/16550-type serial ports * * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. @@ -273,7 +271,7 @@ static const struct serial8250_config uart_config[] = { .fifo_size = 32, .tx_loadsz = 32, .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, - .flags = UART_CAP_FIFO | UART_CAP_UUE, + .flags = UART_CAP_FIFO | UART_CAP_UUE | UART_CAP_RTOIE, }, [PORT_RM9000] = { .name = "RM9000", @@ -303,6 +301,14 @@ static const struct serial8250_config uart_config[] = { .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10, .flags = UART_CAP_FIFO | UART_CAP_AFE, }, + [PORT_TEGRA] = { + .name = "Tegra", + .fifo_size = 32, + .tx_loadsz = 8, + .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_01 | + UART_FCR_T_TRIG_01, + .flags = UART_CAP_FIFO | UART_CAP_RTOIE, + }, }; #if defined(CONFIG_MIPS_ALCHEMY) @@ -1427,6 +1433,27 @@ static void serial8250_enable_ms(struct uart_port *port) serial_out(up, UART_IER, up->ier); } +/* + * Clear the Tegra rx fifo after a break + * + * FIXME: This needs to become a port specific callback once we have a + * framework for this + */ +static void clear_rx_fifo(struct uart_8250_port *up) +{ + unsigned int status, tmout = 10000; + do { + status = serial_in(up, UART_LSR); + if (status & (UART_LSR_FIFOE | UART_LSR_BRK_ERROR_BITS)) + status = serial_in(up, UART_RX); + else + break; + if (--tmout == 0) + break; + udelay(1); + } while (1); +} + static void receive_chars(struct uart_8250_port *up, unsigned int *status) { @@ -1462,6 +1489,13 @@ receive_chars(struct uart_8250_port *up, unsigned int *status) lsr &= ~(UART_LSR_FE | UART_LSR_PE); up->port.icount.brk++; /* + * If tegra port then clear the rx fifo to + * accept another break/character. + */ + if (up->port.type == PORT_TEGRA) + clear_rx_fifo(up); + + /* * We do the SysRQ and SAK checking * here because otherwise the break * may get masked by ignore_status_mask @@ -1629,7 +1663,7 @@ static irqreturn_t serial8250_interrupt(int irq, void *dev_id) up->port.iotype == UPIO_DWAPB32) && (iir & UART_IIR_BUSY) == UART_IIR_BUSY) { /* The DesignWare APB UART has an Busy Detect (0x07) - * interrupt meaning an LCR write attempt occured while the + * interrupt meaning an LCR write attempt occurred while the * UART was busy. The interrupt must be cleared by reading * the UART status register (USR) and the LCR re-written. */ unsigned int status; @@ -2405,7 +2439,9 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios, UART_ENABLE_MS(&up->port, termios->c_cflag)) up->ier |= UART_IER_MSI; if (up->capabilities & UART_CAP_UUE) - up->ier |= UART_IER_UUE | UART_IER_RTOIE; + up->ier |= UART_IER_UUE; + if (up->capabilities & UART_CAP_RTOIE) + up->ier |= UART_IER_RTOIE; serial_out(up, UART_IER, up->ier); |