static void sbd_receive_chars(struct sbd_port *sport)
{
struct uart_port *uport = &sport->port;
struct uart_icount *icount;
unsigned int status, ch, flag;
int count;
for (count = 16; count; count--) {
status = read_sbdchn(sport, R_DUART_STATUS);
if (!(status & M_DUART_RX_RDY))
break;
ch = read_sbdchn(sport, R_DUART_RX_HOLD);
flag = TTY_NORMAL;
icount = &uport->icount;
icount->rx++;
if (unlikely(status &
(M_DUART_RCVD_BRK | M_DUART_FRM_ERR |
M_DUART_PARITY_ERR | M_DUART_OVRUN_ERR))) {
if (status & M_DUART_RCVD_BRK) {
icount->brk++;
if (uart_handle_break(uport))
continue;
} else if (status & M_DUART_FRM_ERR)
icount->frame++;
else if (status & M_DUART_PARITY_ERR)
icount->parity++;
if (status & M_DUART_OVRUN_ERR)
icount->overrun++;
status &= uport->read_status_mask;
if (status & M_DUART_RCVD_BRK)
flag = TTY_BREAK;
else if (status & M_DUART_FRM_ERR)
flag = TTY_FRAME;
else if (status & M_DUART_PARITY_ERR)
flag = TTY_PARITY;
}
if (uart_handle_sysrq_char(uport, ch))
continue;
uart_insert_char(uport, status, M_DUART_OVRUN_ERR, ch, flag);
}
tty_flip_buffer_push(uport->state->port.tty);
}
static int sbd_startup(struct uart_port *uport)
{
struct sbd_port *sport = to_sport(uport);
unsigned int mode1;
int ret;
ret = request_irq(sport->port.irq, sbd_interrupt,
IRQF_SHARED, "sb1250-duart", sport);
if (ret)
return ret;
/* Clear the receive FIFO. */
sbd_receive_drain(sport);
/* Clear the interrupt registers. */
write_sbdchn(sport, R_DUART_CMD, V_DUART_MISC_CMD_RESET_BREAK_INT);
read_sbdshr(sport, R_DUART_INCHREG((uport->line) % 2));
/* Set rx/tx interrupt to FIFO available. */
mode1 = read_sbdchn(sport, R_DUART_MODE_REG_1);
mode1 &= ~(M_DUART_RX_IRQ_SEL_RXFULL | M_DUART_TX_IRQ_SEL_TXEMPT);
write_sbdchn(sport, R_DUART_MODE_REG_1, mode1);
/* Disable tx, enable rx. */
write_sbdchn(sport, R_DUART_CMD, M_DUART_TX_DIS | M_DUART_RX_EN);
sport->tx_stopped = 1;
/* Enable interrupts. */
write_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2),
M_DUART_IMR_IN | M_DUART_IMR_RX);
return 0;
}
static void sbd_set_mctrl(struct uart_port *uport, unsigned int mctrl)
{
struct sbd_port *sport = to_sport(uport);
unsigned int clr = 0, set = 0, mode2;
if (mctrl & TIOCM_DTR)
set |= M_DUART_SET_OPR2;
else
clr |= M_DUART_CLR_OPR2;
if (mctrl & TIOCM_RTS)
set |= M_DUART_SET_OPR0;
else
clr |= M_DUART_CLR_OPR0;
clr <<= (uport->line) % 2;
set <<= (uport->line) % 2;
mode2 = read_sbdchn(sport, R_DUART_MODE_REG_2);
mode2 &= ~M_DUART_CHAN_MODE;
if (mctrl & TIOCM_LOOP)
mode2 |= V_DUART_CHAN_MODE_LCL_LOOP;
else
mode2 |= V_DUART_CHAN_MODE_NORMAL;
write_sbdshr(sport, R_DUART_CLEAR_OPR, clr);
write_sbdshr(sport, R_DUART_SET_OPR, set);
write_sbdchn(sport, R_DUART_MODE_REG_2, mode2);
}
static int sbd_startup(struct uart_port *uport)
{
struct sbd_port *sport = to_sport(uport);
unsigned int mode1;
int ret;
ret = request_irq(sport->port.irq, sbd_interrupt,
IRQF_SHARED, "sb1250-duart", sport);
if (ret)
return ret;
sbd_receive_drain(sport);
write_sbdchn(sport, R_DUART_CMD, V_DUART_MISC_CMD_RESET_BREAK_INT);
read_sbdshr(sport, R_DUART_INCHREG((uport->line) % 2));
mode1 = read_sbdchn(sport, R_DUART_MODE_REG_1);
mode1 &= ~(M_DUART_RX_IRQ_SEL_RXFULL | M_DUART_TX_IRQ_SEL_TXEMPT);
write_sbdchn(sport, R_DUART_MODE_REG_1, mode1);
write_sbdchn(sport, R_DUART_CMD, M_DUART_TX_DIS | M_DUART_RX_EN);
sport->tx_stopped = 1;
write_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2),
M_DUART_IMR_IN | M_DUART_IMR_RX);
return 0;
}
static int sbd_receive_drain(struct sbd_port *sport)
{
int loops = 10000;
while (sbd_receive_ready(sport) && --loops)
read_sbdchn(sport, R_DUART_RX_HOLD);
return loops;
}
static void sbd_set_termios(struct uart_port *uport, struct ktermios *termios,
struct ktermios *old_termios)
{
struct sbd_port *sport = to_sport(uport);
unsigned int mode1 = 0, mode2 = 0, aux = 0;
unsigned int mode1mask = 0, mode2mask = 0, auxmask = 0;
unsigned int oldmode1, oldmode2, oldaux;
unsigned int baud, brg;
unsigned int command;
mode1mask |= ~(M_DUART_PARITY_MODE | M_DUART_PARITY_TYPE_ODD |
M_DUART_BITS_PER_CHAR);
mode2mask |= ~M_DUART_STOP_BIT_LEN_2;
auxmask |= ~M_DUART_CTS_CHNG_ENA;
/* Byte size. */
switch (termios->c_cflag & CSIZE) {
case CS5:
case CS6:
/* Unsupported, leave unchanged. */
mode1mask |= M_DUART_PARITY_MODE;
break;
case CS7:
mode1 |= V_DUART_BITS_PER_CHAR_7;
break;
case CS8:
default:
mode1 |= V_DUART_BITS_PER_CHAR_8;
break;
}
/* Parity and stop bits. */
if (termios->c_cflag & CSTOPB)
mode2 |= M_DUART_STOP_BIT_LEN_2;
else
mode2 |= M_DUART_STOP_BIT_LEN_1;
if (termios->c_cflag & PARENB)
mode1 |= V_DUART_PARITY_MODE_ADD;
else
mode1 |= V_DUART_PARITY_MODE_NONE;
if (termios->c_cflag & PARODD)
mode1 |= M_DUART_PARITY_TYPE_ODD;
else
mode1 |= M_DUART_PARITY_TYPE_EVEN;
baud = uart_get_baud_rate(uport, termios, old_termios, 1200, 5000000);
brg = V_DUART_BAUD_RATE(baud);
/* The actual lower bound is 1221bps, so compensate. */
if (brg > M_DUART_CLK_COUNTER)
brg = M_DUART_CLK_COUNTER;
uart_update_timeout(uport, termios->c_cflag, baud);
uport->read_status_mask = M_DUART_OVRUN_ERR;
if (termios->c_iflag & INPCK)
uport->read_status_mask |= M_DUART_FRM_ERR |
M_DUART_PARITY_ERR;
if (termios->c_iflag & (BRKINT | PARMRK))
uport->read_status_mask |= M_DUART_RCVD_BRK;
uport->ignore_status_mask = 0;
if (termios->c_iflag & IGNPAR)
uport->ignore_status_mask |= M_DUART_FRM_ERR |
M_DUART_PARITY_ERR;
if (termios->c_iflag & IGNBRK) {
uport->ignore_status_mask |= M_DUART_RCVD_BRK;
if (termios->c_iflag & IGNPAR)
uport->ignore_status_mask |= M_DUART_OVRUN_ERR;
}
if (termios->c_cflag & CREAD)
command = M_DUART_RX_EN;
else
command = M_DUART_RX_DIS;
if (termios->c_cflag & CRTSCTS)
aux |= M_DUART_CTS_CHNG_ENA;
else
aux &= ~M_DUART_CTS_CHNG_ENA;
spin_lock(&uport->lock);
if (sport->tx_stopped)
command |= M_DUART_TX_DIS;
else
command |= M_DUART_TX_EN;
oldmode1 = read_sbdchn(sport, R_DUART_MODE_REG_1) & mode1mask;
oldmode2 = read_sbdchn(sport, R_DUART_MODE_REG_2) & mode2mask;
oldaux = read_sbdchn(sport, R_DUART_AUXCTL_X) & auxmask;
if (!sport->tx_stopped)
sbd_line_drain(sport);
write_sbdchn(sport, R_DUART_CMD, M_DUART_TX_DIS | M_DUART_RX_DIS);
write_sbdchn(sport, R_DUART_MODE_REG_1, mode1 | oldmode1);
write_sbdchn(sport, R_DUART_MODE_REG_2, mode2 | oldmode2);
write_sbdchn(sport, R_DUART_CLK_SEL, brg);
write_sbdchn(sport, R_DUART_AUXCTL_X, aux | oldaux);
write_sbdchn(sport, R_DUART_CMD, command);
spin_unlock(&uport->lock);
}
static int sbd_transmit_empty(struct sbd_port *sport)
{
return read_sbdchn(sport, R_DUART_STATUS) & M_DUART_TX_EMT;
}
static int __maybe_unused sbd_transmit_ready(struct sbd_port *sport)
{
return read_sbdchn(sport, R_DUART_STATUS) & M_DUART_TX_RDY;
}
static int sbd_receive_ready(struct sbd_port *sport)
{
return read_sbdchn(sport, R_DUART_STATUS) & M_DUART_RX_RDY;
}
