#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);

	serial8250_modem_status(up);

	if (lsr & UART_LSR_THRE)
		serial8250_tx_chars(up);

	up->lsr_saved_flags = orig_lsr;
	spin_unlock_irqrestore(&up->port.lock, flags);
	return 1;
}
EXPORT_SYMBOL_GPL(fsl8250_handle_irq);
</a><a href='/cgit.cgi/linux/net-next.git/tree/sound/soc/sunxi/Kconfig?h=nds-private-remove&amp;id=3efa70d78f218e4c9276b0bac0545e5184c1c47b'>tree</a><a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/sunxi/Kconfig?h=nds-private-remove&amp;id=3efa70d78f218e4c9276b0bac0545e5184c1c47b'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/sound/soc/sunxi/Kconfig?h=nds-private-remove&amp;id=3efa70d78f218e4c9276b0bac0545e5184c1c47b'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/sound/soc/sunxi/Kconfig'>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?h=nds-private-remove&amp;id=3efa70d78f218e4c9276b0bac0545e5184c1c47b'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/sound?h=nds-private-remove&amp;id=3efa70d78f218e4c9276b0bac0545e5184c1c47b'>sound</a>/<a href='/cgit.cgi/linux/net-next.git/log/sound/soc?h=nds-private-remove&amp;id=3efa70d78f218e4c9276b0bac0545e5184c1c47b'>soc</a>/<a href='/cgit.cgi/linux/net-next.git/log/sound/soc/sunxi?h=nds-private-remove&amp;id=3efa70d78f218e4c9276b0bac0545e5184c1c47b'>sunxi</a>/<a href='/cgit.cgi/linux/net-next.git/log/sound/soc/sunxi/Kconfig?h=nds-private-remove&amp;id=3efa70d78f218e4c9276b0bac0545e5184c1c47b'>Kconfig</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/sound/soc/sunxi/Kconfig?h=nds-private-remove&amp;id=3efa70d78f218e4c9276b0bac0545e5184c1c47b&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
/td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>David S. Miller &lt;davem@davemloft.net&gt;</td><td class='right'>2017-01-30 22:05:52 -0500</td></tr>
<tr><th>committer</th><td>David S. Miller &lt;davem@davemloft.net&gt;</td><td class='right'>2017-01-30 22:05:52 -0500</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/rds/ib_recv.c?id=1bae6c99decf9137069646b593d3439171a8a8e2'>1bae6c99decf9137069646b593d3439171a8a8e2</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/rds/ib_recv.c?id=1bae6c99decf9137069646b593d3439171a8a8e2'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=1bae6c99decf9137069646b593d3439171a8a8e2'>431604a568cd2303973470de326bd9731370a025</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/rds/ib_recv.c?id=1bae6c99decf9137069646b593d3439171a8a8e2'>net/rds/ib_recv.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/rds/ib_recv.c?id=63c190429020a9701b42887ac22c28f287f1762f'>63c190429020a9701b42887ac22c28f287f1762f</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/rds/ib_recv.c?id=1bae6c99decf9137069646b593d3439171a8a8e2&amp;id2=63c190429020a9701b42887ac22c28f287f1762f'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/rds/ib_recv.c?id=2b2d3eb41c920b47df2fcedd1489cf748bd09466'>2b2d3eb41c920b47df2fcedd1489cf748bd09466</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/rds/ib_recv.c?id=1bae6c99decf9137069646b593d3439171a8a8e2&amp;id2=2b2d3eb41c920b47df2fcedd1489cf748bd09466'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge branch 'sh_eth-E-DMAC-interrupt-mask-cleanups'</div><div class='commit-msg'>Sergei Shtylyov says:

====================
sh_eth: E-DMAC interrupt mask cleanups

   Here's a set of 3 patches against DaveM's 'net-next.git' repo. The main goal
of this set is to stop using the bare numbers for the E-DMAC interrupt masks.

[1/3] sh_eth: rename EESIPR bits
[2/3] sh_eth: add missing EESIPR bits
[3/3] sh_eth: stop using bare numbers for EESIPR values
====================

Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=1bae6c99decf9137069646b593d3439171a8a8e2'>Diffstat</a> (limited to 'net/rds/ib_recv.c')</div><table summary='diffstat' class='diffstat'>