/*
* Check if transmitter is empty
* The port lock is not held.
*/
static unsigned int pmz_tx_empty(struct uart_port *port)
{
struct uart_pmac_port *uap = to_pmz(port);
unsigned char status;
if (ZS_IS_ASLEEP(uap) || uap->node == NULL)
return TIOCSER_TEMT;
status = pmz_peek_status(to_pmz(port));
if (status & Tx_BUF_EMP)
return TIOCSER_TEMT;
return 0;
}
/*
* Control break state emission
* The port lock is not held.
*/
static void pmz_break_ctl(struct uart_port *port, int break_state)
{
struct uart_pmac_port *uap = to_pmz(port);
unsigned char set_bits, clear_bits, new_reg;
unsigned long flags;
if (uap->node == NULL)
return;
set_bits = clear_bits = 0;
if (break_state)
set_bits |= SND_BRK;
else
clear_bits |= SND_BRK;
spin_lock_irqsave(&port->lock, flags);
new_reg = (uap->curregs[R5] | set_bits) & ~clear_bits;
if (new_reg != uap->curregs[R5]) {
uap->curregs[R5] = new_reg;
/* NOTE: Not subject to 'transmitter active' rule. */
if (ZS_IS_ASLEEP(uap))
return;
write_zsreg(uap, R5, uap->curregs[R5]);
}
spin_unlock_irqrestore(&port->lock, flags);
}
static const char *pmz_type(struct uart_port *port)
{
struct uart_pmac_port *uap = to_pmz(port);
if (ZS_IS_IRDA(uap))
return "Z85c30 ESCC - Infrared port";
else if (ZS_IS_INTMODEM(uap))
return "Z85c30 ESCC - Internal modem";
return "Z85c30 ESCC - Serial port";
}
/*
* Get Modem Control bits (only the input ones, the core will
* or that with a cached value of the control ones)
* The port lock is not held.
*/
static unsigned int pmz_get_mctrl(struct uart_port *port)
{
struct uart_pmac_port *uap = to_pmz(port);
unsigned char status;
unsigned int ret;
if (ZS_IS_ASLEEP(uap) || uap->node == NULL)
return 0;
status = pmz_peek_status(to_pmz(port));
ret = 0;
if (status & DCD)
ret |= TIOCM_CAR;
if (status & SYNC_HUNT)
ret |= TIOCM_DSR;
if (!(status & CTS))
ret |= TIOCM_CTS;
return ret;
}
static void pmz_shutdown(struct uart_port *port)
{
struct uart_pmac_port *uap = to_pmz(port);
unsigned long flags;
pmz_debug("pmz: shutdown()\n");
if (uap->node == NULL)
return;
mutex_lock(&pmz_irq_mutex);
/* Release interrupt handler */
free_irq(uap->port.irq, uap);
spin_lock_irqsave(&port->lock, flags);
uap->flags &= ~PMACZILOG_FLAG_IS_OPEN;
if (!ZS_IS_OPEN(uap->mate))
pmz_get_port_A(uap)->flags &= ~PMACZILOG_FLAG_IS_IRQ_ON;
/* Disable interrupts */
if (!ZS_IS_ASLEEP(uap)) {
uap->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
write_zsreg(uap, R1, uap->curregs[R1]);
zssync(uap);
}
if (ZS_IS_CONS(uap) || ZS_IS_ASLEEP(uap)) {
spin_unlock_irqrestore(&port->lock, flags);
mutex_unlock(&pmz_irq_mutex);
return;
}
/* Disable receiver and transmitter. */
uap->curregs[R3] &= ~RxENABLE;
uap->curregs[R5] &= ~TxENABLE;
/* Disable all interrupts and BRK assertion. */
uap->curregs[R5] &= ~SND_BRK;
pmz_maybe_update_regs(uap);
/* Shut the chip down */
pmz_set_scc_power(uap, 0);
spin_unlock_irqrestore(&port->lock, flags);
mutex_unlock(&pmz_irq_mutex);
pmz_debug("pmz: shutdown() done.\n");
}
static void __pmz_set_termios(struct uart_port *port, struct ktermios *termios,
struct ktermios *old)
{
struct uart_pmac_port *uap = to_pmz(port);
unsigned long baud;
pmz_debug("pmz: set_termios()\n");
if (ZS_IS_ASLEEP(uap))
return;
memcpy(&uap->termios_cache, termios, sizeof(struct ktermios));
/* XXX Check which revs of machines actually allow 1 and 4Mb speeds
* on the IR dongle. Note that the IRTTY driver currently doesn't know
* about the FIR mode and high speed modes. So these are unused. For
* implementing proper support for these, we should probably add some
* DMA as well, at least on the Rx side, which isn't a simple thing
* at this point.
*/
if (ZS_IS_IRDA(uap)) {
/* Calc baud rate */
baud = uart_get_baud_rate(port, termios, old, 1200, 4000000);
pmz_debug("pmz: switch IRDA to %ld bauds\n", baud);
/* Cet the irda codec to the right rate */
pmz_irda_setup(uap, &baud);
/* Set final baud rate */
pmz_convert_to_zs(uap, termios->c_cflag, termios->c_iflag, baud);
pmz_load_zsregs(uap, uap->curregs);
zssync(uap);
} else {
baud = uart_get_baud_rate(port, termios, old, 1200, 230400);
pmz_convert_to_zs(uap, termios->c_cflag, termios->c_iflag, baud);
/* Make sure modem status interrupts are correctly configured */
if (UART_ENABLE_MS(&uap->port, termios->c_cflag)) {
uap->curregs[R15] |= DCDIE | SYNCIE | CTSIE;
uap->flags |= PMACZILOG_FLAG_MODEM_STATUS;
} else {
uap->curregs[R15] &= ~(DCDIE | SYNCIE | CTSIE);
uap->flags &= ~PMACZILOG_FLAG_MODEM_STATUS;
}
/* Load registers to the chip */
pmz_maybe_update_regs(uap);
}
uart_update_timeout(port, termios->c_cflag, baud);
pmz_debug("pmz: set_termios() done.\n");
}
/*
* Stop Rx side, basically disable emitting of
* Rx interrupts on the port. We don't disable the rx
* side of the chip proper though
* The port lock is held.
*/
static void pmz_stop_rx(struct uart_port *port)
{
struct uart_pmac_port *uap = to_pmz(port);
if (ZS_IS_ASLEEP(uap) || uap->node == NULL)
return;
pmz_debug("pmz: stop_rx()()\n");
/* Disable all RX interrupts. */
uap->curregs[R1] &= ~RxINT_MASK;
pmz_maybe_update_regs(uap);
pmz_debug("pmz: stop_rx() done.\n");
}
/*
* Enable modem status change interrupts
* The port lock is held.
*/
static void pmz_enable_ms(struct uart_port *port)
{
struct uart_pmac_port *uap = to_pmz(port);
unsigned char new_reg;
if (ZS_IS_IRDA(uap) || uap->node == NULL)
return;
new_reg = uap->curregs[R15] | (DCDIE | SYNCIE | CTSIE);
if (new_reg != uap->curregs[R15]) {
uap->curregs[R15] = new_reg;
if (ZS_IS_ASLEEP(uap))
return;
/* NOTE: Not subject to 'transmitter active' rule. */
write_zsreg(uap, R15, uap->curregs[R15]);
}
}
/*
* Kick the Tx side.
* The port lock is held and interrupts are disabled.
*/
static void pmz_start_tx(struct uart_port *port)
{
struct uart_pmac_port *uap = to_pmz(port);
unsigned char status;
pmz_debug("pmz: start_tx()\n");
uap->flags |= PMACZILOG_FLAG_TX_ACTIVE;
uap->flags &= ~PMACZILOG_FLAG_TX_STOPPED;
if (ZS_IS_ASLEEP(uap) || uap->node == NULL)
return;
status = read_zsreg(uap, R0);
/* TX busy? Just wait for the TX done interrupt. */
if (!(status & Tx_BUF_EMP))
return;
/* Send the first character to jump-start the TX done
* IRQ sending engine.
*/
if (port->x_char) {
write_zsdata(uap, port->x_char);
zssync(uap);
port->icount.tx++;
port->x_char = 0;
} else {
struct circ_buf *xmit = &port->info->xmit;
write_zsdata(uap, xmit->buf[xmit->tail]);
zssync(uap);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
port->icount.tx++;
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(&uap->port);
}
pmz_debug("pmz: start_tx() done.\n");
}
/*
* Set Modem Control (RTS & DTR) bits
* The port lock is held and interrupts are disabled.
* Note: Shall we really filter out RTS on external ports or
* should that be dealt at higher level only ?
*/
static void pmz_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
struct uart_pmac_port *uap = to_pmz(port);
unsigned char set_bits, clear_bits;
/* Do nothing for irda for now... */
if (ZS_IS_IRDA(uap))
return;
/* We get called during boot with a port not up yet */
if (ZS_IS_ASLEEP(uap) ||
!(ZS_IS_OPEN(uap) || ZS_IS_CONS(uap)))
return;
set_bits = clear_bits = 0;
if (ZS_IS_INTMODEM(uap)) {
if (mctrl & TIOCM_RTS)
set_bits |= RTS;
else
clear_bits |= RTS;
}
if (mctrl & TIOCM_DTR)
set_bits |= DTR;
else
clear_bits |= DTR;
/* NOTE: Not subject to 'transmitter active' rule. */
uap->curregs[R5] |= set_bits;
uap->curregs[R5] &= ~clear_bits;
if (ZS_IS_ASLEEP(uap))
return;
write_zsreg(uap, R5, uap->curregs[R5]);
pmz_debug("pmz_set_mctrl: set bits: %x, clear bits: %x -> %x\n",
set_bits, clear_bits, uap->curregs[R5]);
zssync(uap);
}
/* The port lock is not held. */
static void pmz_set_termios(struct uart_port *port, struct ktermios *termios,
struct ktermios *old)
{
struct uart_pmac_port *uap = to_pmz(port);
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
/* Disable IRQs on the port */
uap->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
write_zsreg(uap, R1, uap->curregs[R1]);
/* Setup new port configuration */
__pmz_set_termios(port, termios, old);
/* Re-enable IRQs on the port */
if (ZS_IS_OPEN(uap)) {
uap->curregs[R1] |= INT_ALL_Rx | TxINT_ENAB;
if (!ZS_IS_EXTCLK(uap))
uap->curregs[R1] |= EXT_INT_ENAB;
write_zsreg(uap, R1, uap->curregs[R1]);
}
spin_unlock_irqrestore(&port->lock, flags);
}
/*
* This is the "normal" startup routine, using the above one
* wrapped with the lock and doing a schedule delay
*/
static int pmz_startup(struct uart_port *port)
{
struct uart_pmac_port *uap = to_pmz(port);
unsigned long flags;
int pwr_delay = 0;
pmz_debug("pmz: startup()\n");
if (ZS_IS_ASLEEP(uap))
return -EAGAIN;
if (uap->node == NULL)
return -ENODEV;
mutex_lock(&pmz_irq_mutex);
uap->flags |= PMACZILOG_FLAG_IS_OPEN;
/* A console is never powered down. Else, power up and
* initialize the chip
*/
if (!ZS_IS_CONS(uap)) {
spin_lock_irqsave(&port->lock, flags);
pwr_delay = __pmz_startup(uap);
spin_unlock_irqrestore(&port->lock, flags);
}
pmz_get_port_A(uap)->flags |= PMACZILOG_FLAG_IS_IRQ_ON;
if (request_irq(uap->port.irq, pmz_interrupt, IRQF_SHARED, "PowerMac Zilog", uap)) {
dev_err(&uap->dev->ofdev.dev,
"Unable to register zs interrupt handler.\n");
pmz_set_scc_power(uap, 0);
mutex_unlock(&pmz_irq_mutex);
return -ENXIO;
}
mutex_unlock(&pmz_irq_mutex);
/* Right now, we deal with delay by blocking here, I'll be
* smarter later on
*/
if (pwr_delay != 0) {
pmz_debug("pmz: delaying %d ms\n", pwr_delay);
msleep(pwr_delay);
}
/* IrDA reset is done now */
if (ZS_IS_IRDA(uap))
pmz_irda_reset(uap);
/* Enable interrupts emission from the chip */
spin_lock_irqsave(&port->lock, flags);
uap->curregs[R1] |= INT_ALL_Rx | TxINT_ENAB;
if (!ZS_IS_EXTCLK(uap))
uap->curregs[R1] |= EXT_INT_ENAB;
write_zsreg(uap, R1, uap->curregs[R1]);
spin_unlock_irqrestore(&port->lock, flags);
pmz_debug("pmz: startup() done.\n");
return 0;
}
/*
* Stop TX side. Dealt like sunzilog at next Tx interrupt,
* though for DMA, we will have to do a bit more.
* The port lock is held and interrupts are disabled.
*/
static void pmz_stop_tx(struct uart_port *port)
{
to_pmz(port)->flags |= PMACZILOG_FLAG_TX_STOPPED;
}
