blob: 910bfee5a88b7f07f5a4c00aad47a45361a1d19b [file] [log] [blame]
#include <linux/serial_reg.h>
#include <linux/serial_8250.h>
#include "8250.h"
* Freescale 16550 UART "driver", Copyright (C) 2011 Paul Gortmaker.
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
* This isn't a full driver; it just provides an alternate IRQ
* handler to deal with an errata. Everything else is just
* using the bog standard 8250 support.
* We follow code flow of serial8250_default_handle_irq() but add
* a check for a break and insert a dummy read on the Rx for the
* immediately following IRQ event.
* We re-use the already existing "bug handling" lsr_saved_flags
* field to carry the "what we just did" information from the one
* IRQ event to the next one.
int fsl8250_handle_irq(struct uart_port *port)
unsigned char lsr, orig_lsr;
unsigned long flags;
unsigned int iir;
struct uart_8250_port *up = up_to_u8250p(port);
spin_lock_irqsave(&up->port.lock, flags);
iir = port->serial_in(port, UART_IIR);
if (iir & UART_IIR_NO_INT) {
spin_unlock_irqrestore(&up->port.lock, flags);
return 0;
/* This is the WAR; if last event was BRK, then read and return */
if (unlikely(up->lsr_saved_flags & UART_LSR_BI)) {
up->lsr_saved_flags &= ~UART_LSR_BI;
port->serial_in(port, UART_RX);
spin_unlock_irqrestore(&up->port.lock, flags);
return 1;
lsr = orig_lsr = up->port.serial_in(&up->port, UART_LSR);
if (lsr & (UART_LSR_DR | UART_LSR_BI))
lsr = serial8250_rx_chars(up, lsr);
if (lsr & UART_LSR_THRE)
up->lsr_saved_flags = orig_lsr;
spin_unlock_irqrestore(&up->port.lock, flags);
return 1;