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authorPaul Gortmaker <paul.gortmaker@windriver.com>2011-12-04 18:42:23 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2011-12-09 19:14:13 -0800
commit9deaa53ac7fa373623123aa4f18828dd62292b1a (patch)
tree938b41e9c534582f9152386ce1ee6893c3274c6b /include/linux/serial_8250.h
parent86b21199fc45e0052e181fefc07c747e9dc903b3 (diff)
serial: add irq handler for Freescale 16550 errata.
Sending a break on the SOC UARTs found in some MPC83xx/85xx/86xx chips seems to cause a short lived IRQ storm (/proc/interrupts typically shows somewhere between 300 and 1500 events). Unfortunately this renders SysRQ over the serial console completely inoperable. The suggested workaround in the errata is to read the Rx register, wait one character period, and then read the Rx register again. We achieve this by tracking the old LSR value, and on the subsequent interrupt event after a break, we don't read LSR, instead we just read the RBR again and return immediately. The "fsl,ns16550" is used in the compatible field of the serial device to mark UARTs known to have this issue. Thanks to Scott Wood for providing the errata data which led to a much cleaner fix. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Acked-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include/linux/serial_8250.h')
-rw-r--r--include/linux/serial_8250.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h
index b44034eca123..8f012f8ac8e9 100644
--- a/include/linux/serial_8250.h
+++ b/include/linux/serial_8250.h
@@ -82,6 +82,7 @@ extern void serial8250_do_set_termios(struct uart_port *port,
struct ktermios *termios, struct ktermios *old);
extern void serial8250_do_pm(struct uart_port *port, unsigned int state,
unsigned int oldstate);
+extern int fsl8250_handle_irq(struct uart_port *port);
int serial8250_handle_irq(struct uart_port *port, unsigned int iir);
unsigned char serial8250_rx_chars(struct uart_8250_port *up, unsigned char lsr);
void serial8250_tx_chars(struct uart_8250_port *up);