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MIPS: Alchemy: Threaded carddetect irqs for devboards

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This introduces threaded carddetect irqs for the db1200/db1300 boards.
Main benefit is that the broken insertion/ejection interrupt pairs
can now be better supported and debounced in software.

Signed-off-by: Manuel Lauss <[email protected]>
Cc: James Hogan <[email protected]>
Cc: [email protected]
Patchwork: https://patchwork.linux-mips.org/patch/15287/
Signed-off-by: Ralf Baechle <[email protected]>
This commit is contained in:
Manuel Lauss 2017-02-14 13:03:28 +01:00 • committed by Ralf Baechle
commit cc10815e2f
3 changed files with 72 additions and 56 deletions
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33
drivers/pcmcia/db1xxx_ss.c
View file

@ -131,22 +131,27 @@ static irqreturn_t db1000_pcmcia_stschgirq(int irq, void *data)
return IRQ_HANDLED;
}
/* Db/Pb1200 have separate per-socket insertion and ejection
* interrupts which stay asserted as long as the card is
* inserted/missing. The one which caused us to be called
* needs to be disabled and the other one enabled.
*/
static irqreturn_t db1200_pcmcia_cdirq(int irq, void *data)
{
disable_irq_nosync(irq);
return IRQ_WAKE_THREAD;
}
static irqreturn_t db1200_pcmcia_cdirq_fn(int irq, void *data)
{
struct db1x_pcmcia_sock *sock = data;
/* Db/Pb1200 have separate per-socket insertion and ejection
* interrupts which stay asserted as long as the card is
* inserted/missing. The one which caused us to be called
* needs to be disabled and the other one enabled.
*/
if (irq == sock->insert_irq) {
disable_irq_nosync(sock->insert_irq);
/* Wait a bit for the signals to stop bouncing. */
msleep(100);
if (irq == sock->insert_irq)
enable_irq(sock->eject_irq);
} else {
disable_irq_nosync(sock->eject_irq);
else
enable_irq(sock->insert_irq);
}
pcmcia_parse_events(&sock->socket, SS_DETECT);
@ -172,13 +177,13 @@ static int db1x_pcmcia_setup_irqs(struct db1x_pcmcia_sock *sock)
*/
if ((sock->board_type == BOARD_TYPE_DB1200) ||
(sock->board_type == BOARD_TYPE_DB1300)) {
ret = request_irq(sock->insert_irq, db1200_pcmcia_cdirq,
0, "pcmcia_insert", sock);
ret = request_threaded_irq(sock->insert_irq, db1200_pcmcia_cdirq,
db1200_pcmcia_cdirq_fn, 0, "pcmcia_insert", sock);
if (ret)
goto out1;
ret = request_irq(sock->eject_irq, db1200_pcmcia_cdirq,
0, "pcmcia_eject", sock);
ret = request_threaded_irq(sock->eject_irq, db1200_pcmcia_cdirq,
db1200_pcmcia_cdirq_fn, 0, "pcmcia_eject", sock);
if (ret) {
free_irq(sock->insert_irq, sock);
goto out1;