#define DEBUG_AUTOCONF(fmt...) do { } while (0)
#endif
-#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
-
/*
* Here we define the default xmit fifo size used for each type of UART.
*/
#ifdef CONFIG_SERIAL_8250_RT288X
+#define UART_REG_UNMAPPED -1
+
/* Au1x00/RT288x UART hardware has a weird register layout */
static const s8 au_io_in_map[8] = {
- 0, /* UART_RX */
- 2, /* UART_IER */
- 3, /* UART_IIR */
- 5, /* UART_LCR */
- 6, /* UART_MCR */
- 7, /* UART_LSR */
- 8, /* UART_MSR */
- -1, /* UART_SCR (unmapped) */
+ [UART_RX] = 0,
+ [UART_IER] = 2,
+ [UART_IIR] = 3,
+ [UART_LCR] = 5,
+ [UART_MCR] = 6,
+ [UART_LSR] = 7,
+ [UART_MSR] = 8,
+ [UART_SCR] = UART_REG_UNMAPPED,
};
static const s8 au_io_out_map[8] = {
- 1, /* UART_TX */
- 2, /* UART_IER */
- 4, /* UART_FCR */
- 5, /* UART_LCR */
- 6, /* UART_MCR */
- -1, /* UART_LSR (unmapped) */
- -1, /* UART_MSR (unmapped) */
- -1, /* UART_SCR (unmapped) */
+ [UART_TX] = 1,
+ [UART_IER] = 2,
+ [UART_FCR] = 4,
+ [UART_LCR] = 5,
+ [UART_MCR] = 6,
+ [UART_LSR] = UART_REG_UNMAPPED,
+ [UART_MSR] = UART_REG_UNMAPPED,
+ [UART_SCR] = UART_REG_UNMAPPED,
};
unsigned int au_serial_in(struct uart_port *p, int offset)
if (offset >= ARRAY_SIZE(au_io_in_map))
return UINT_MAX;
offset = au_io_in_map[offset];
- if (offset < 0)
+ if (offset == UART_REG_UNMAPPED)
return UINT_MAX;
return __raw_readl(p->membase + (offset << p->regshift));
}
if (offset >= ARRAY_SIZE(au_io_out_map))
return;
offset = au_io_out_map[offset];
- if (offset < 0)
+ if (offset == UART_REG_UNMAPPED)
return;
__raw_writel(value, p->membase + (offset << p->regshift));
}
}
EXPORT_SYMBOL_GPL(serial8250_em485_destroy);
+struct serial_rs485 serial8250_em485_supported = {
+ .flags = SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND | SER_RS485_RTS_AFTER_SEND |
+ SER_RS485_TERMINATE_BUS | SER_RS485_RX_DURING_TX,
+ .delay_rts_before_send = 1,
+ .delay_rts_after_send = 1,
+};
+EXPORT_SYMBOL_GPL(serial8250_em485_supported);
+
/**
* serial8250_em485_config() - generic ->rs485_config() callback
* @port: uart port
* if the uart is incapable of driving RTS as a Transmit Enable signal in
* hardware, relying on software emulation instead.
*/
-int serial8250_em485_config(struct uart_port *port, struct serial_rs485 *rs485)
+int serial8250_em485_config(struct uart_port *port, struct ktermios *termios,
+ struct serial_rs485 *rs485)
{
struct uart_8250_port *up = up_to_u8250p(port);
rs485->flags &= ~SER_RS485_RTS_AFTER_SEND;
}
- /* clamp the delays to [0, 100ms] */
- rs485->delay_rts_before_send = min(rs485->delay_rts_before_send, 100U);
- rs485->delay_rts_after_send = min(rs485->delay_rts_after_send, 100U);
-
- memset(rs485->padding, 0, sizeof(rs485->padding));
- port->rs485 = *rs485;
-
- gpiod_set_value(port->rs485_term_gpio,
- rs485->flags & SER_RS485_TERMINATE_BUS);
-
/*
* Both serial8250_em485_init() and serial8250_em485_destroy()
* are idempotent.
*/
- if (rs485->flags & SER_RS485_ENABLED) {
- int ret = serial8250_em485_init(up);
-
- if (ret) {
- rs485->flags &= ~SER_RS485_ENABLED;
- port->rs485.flags &= ~SER_RS485_ENABLED;
- }
- return ret;
- }
+ if (rs485->flags & SER_RS485_ENABLED)
+ return serial8250_em485_init(up);
serial8250_em485_destroy(up);
return 0;
serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
old_dl = serial_dl_read(up);
serial_dl_write(up, 0x0001);
- serial_out(up, UART_LCR, 0x03);
+ serial_out(up, UART_LCR, UART_LCR_WLEN8);
for (count = 0; count < 256; count++)
serial_out(up, UART_TX, count);
mdelay(20);/* FIXME - schedule_timeout */
}
}
-static inline void __do_stop_tx(struct uart_8250_port *p)
-{
- if (serial8250_clear_THRI(p))
- serial8250_rpm_put_tx(p);
-}
-
static inline void __stop_tx(struct uart_8250_port *p)
{
struct uart_8250_em485 *em485 = p->em485;
if (em485) {
- unsigned char lsr = serial_in(p, UART_LSR);
+ u16 lsr = serial_lsr_in(p);
u64 stop_delay = 0;
p->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS;
if (!(lsr & UART_LSR_THRE))
return;
/*
- * To provide required timeing and allow FIFO transfer,
+ * To provide required timing and allow FIFO transfer,
* __stop_tx_rs485() must be called only when both FIFO and
* shift register are empty. The device driver should either
* enable interrupt on TEMT or set UART_CAP_NOTEMT that will
__stop_tx_rs485(p, stop_delay);
}
- __do_stop_tx(p);
+
+ if (serial8250_clear_THRI(p))
+ serial8250_rpm_put_tx(p);
}
static void serial8250_stop_tx(struct uart_port *port)
if (serial8250_set_THRI(up)) {
if (up->bugs & UART_BUG_TXEN) {
- unsigned char lsr;
+ u16 lsr = serial_lsr_in(up);
- lsr = serial_in(up, UART_LSR);
- up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS;
if (lsr & UART_LSR_THRE)
serial8250_tx_chars(up);
}
}
EXPORT_SYMBOL_GPL(serial8250_em485_start_tx);
-static inline void start_tx_rs485(struct uart_port *port)
+/* Returns false, if start_tx_timer was setup to defer TX start */
+static bool start_tx_rs485(struct uart_port *port)
{
struct uart_8250_port *up = up_to_u8250p(port);
struct uart_8250_em485 *em485 = up->em485;
em485->active_timer = &em485->start_tx_timer;
start_hrtimer_ms(&em485->start_tx_timer,
up->port.rs485.delay_rts_before_send);
- return;
+ return false;
}
}
- __start_tx(port);
+ return true;
}
static enum hrtimer_restart serial8250_em485_handle_start_tx(struct hrtimer *t)
serial8250_rpm_get_tx(up);
- if (em485 &&
- em485->active_timer == &em485->start_tx_timer)
- return;
-
- if (em485)
- start_tx_rs485(port);
- else
- __start_tx(port);
+ if (em485) {
+ if ((em485->active_timer == &em485->start_tx_timer) ||
+ !start_tx_rs485(port))
+ return;
+ }
+ __start_tx(port);
}
static void serial8250_throttle(struct uart_port *port)
serial8250_rpm_put(up);
}
-void serial8250_read_char(struct uart_8250_port *up, unsigned char lsr)
+void serial8250_read_char(struct uart_8250_port *up, u16 lsr)
{
struct uart_port *port = &up->port;
unsigned char ch;
EXPORT_SYMBOL_GPL(serial8250_read_char);
/*
- * serial8250_rx_chars: processes according to the passed in LSR
- * value, and returns the remaining LSR bits not handled
- * by this Rx routine.
+ * serial8250_rx_chars - Read characters. The first LSR value must be passed in.
+ *
+ * Returns LSR bits. The caller should rely only on non-Rx related LSR bits
+ * (such as THRE) because the LSR value might come from an already consumed
+ * character.
*/
-unsigned char serial8250_rx_chars(struct uart_8250_port *up, unsigned char lsr)
+u16 serial8250_rx_chars(struct uart_8250_port *up, u16 lsr)
{
struct uart_port *port = &up->port;
int max_count = 256;
if (uart_circ_empty(xmit))
break;
if ((up->capabilities & UART_CAP_HFIFO) &&
- (serial_in(up, UART_LSR) & BOTH_EMPTY) != BOTH_EMPTY)
+ !uart_lsr_tx_empty(serial_in(up, UART_LSR)))
break;
/* The BCM2835 MINI UART THRE bit is really a not-full bit. */
if ((up->capabilities & UART_CAP_MINI) &&
*/
int serial8250_handle_irq(struct uart_port *port, unsigned int iir)
{
- unsigned char status;
struct uart_8250_port *up = up_to_u8250p(port);
bool skip_rx = false;
unsigned long flags;
+ u16 status;
if (iir & UART_IIR_NO_INT)
return 0;
spin_lock_irqsave(&port->lock, flags);
- status = serial_port_in(port, UART_LSR);
+ status = serial_lsr_in(up);
/*
* If port is stopped and there are no error conditions in the
{
struct uart_8250_port *up = up_to_u8250p(port);
unsigned long flags;
- unsigned int lsr;
+ u16 lsr;
serial8250_rpm_get(up);
spin_lock_irqsave(&port->lock, flags);
- lsr = serial_port_in(port, UART_LSR);
- up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS;
+ lsr = serial_lsr_in(up);
spin_unlock_irqrestore(&port->lock, flags);
serial8250_rpm_put(up);
- return (lsr & BOTH_EMPTY) == BOTH_EMPTY ? TIOCSER_TEMT : 0;
+ return uart_lsr_tx_empty(lsr) ? TIOCSER_TEMT : 0;
}
unsigned int serial8250_do_get_mctrl(struct uart_port *port)
/* Wait up to 10ms for the character(s) to be sent. */
for (;;) {
- status = serial_in(up, UART_LSR);
-
- up->lsr_saved_flags |= status & LSR_SAVE_FLAGS;
+ status = serial_lsr_in(up);
if ((status & bits) == bits)
break;
static int serial8250_get_poll_char(struct uart_port *port)
{
struct uart_8250_port *up = up_to_u8250p(port);
- unsigned char lsr;
int status;
+ u16 lsr;
serial8250_rpm_get(up);
else
serial_port_out(port, UART_IER, 0);
- wait_for_xmitr(up, BOTH_EMPTY);
+ wait_for_xmitr(up, UART_LSR_BOTH_EMPTY);
/*
* Send the character out.
*/
* Finally, wait for transmitter to become empty
* and restore the IER
*/
- wait_for_xmitr(up, BOTH_EMPTY);
+ wait_for_xmitr(up, UART_LSR_BOTH_EMPTY);
serial_port_out(port, UART_IER, ier);
serial8250_rpm_put(up);
}
{
struct uart_8250_port *up = up_to_u8250p(port);
unsigned long flags;
- unsigned char lsr, iir;
+ unsigned char iir;
int retval;
+ u16 lsr;
if (!port->fifosize)
port->fifosize = uart_config[port->type].fifo_size;
port->read_status_mask |= UART_LSR_BI;
/*
- * Characteres to ignore
+ * Characters to ignore
*/
port->ignore_status_mask = 0;
if (termios->c_iflag & IGNPAR)
autoconfig(up);
if (port->rs485.flags & SER_RS485_ENABLED)
- port->rs485_config(port, &port->rs485);
+ uart_rs485_config(port);
/* if access method is AU, it is a 16550 with a quirk */
if (port->type == PORT_16550A && port->iotype == UPIO_AU)
* Finally, wait for transmitter to become empty
* and restore the IER
*/
- wait_for_xmitr(up, BOTH_EMPTY);
+ wait_for_xmitr(up, UART_LSR_BOTH_EMPTY);
if (em485) {
mdelay(port->rs485.delay_rts_after_send);
projects / linux-2.6-microblaze.git / blobdiff