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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 <manuel.lauss@gmail.com>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/15287/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Manuel Lauss
2017-02-14 13:03:28 +01:00
committed by Ralf Baechle
parent 60d5973c3c
commit cc10815e2f
3 changed files with 72 additions and 56 deletions
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64
arch/mips/alchemy/devboards/db1200.c
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@@ -344,28 +344,32 @@ static struct platform_device db1200_ide_dev = {
/* SD carddetects: they're supposed to be edge-triggered, but ack
* doesn't seem to work (CPLD Rev 2). Instead, the screaming one
* is disabled and its counterpart enabled. The 500ms timeout is
* because the carddetect isn't debounced in hardware.
* is disabled and its counterpart enabled. The 200ms timeout is
* because the carddetect usually triggers twice, after debounce.
*/
static irqreturn_t db1200_mmc_cd(int irq, void *ptr)
{
void(*mmc_cd)(struct mmc_host *, unsigned long);
disable_irq_nosync(irq);
return IRQ_WAKE_THREAD;
}
if (irq == DB1200_SD0_INSERT_INT) {
disable_irq_nosync(DB1200_SD0_INSERT_INT);
enable_irq(DB1200_SD0_EJECT_INT);
} else {
disable_irq_nosync(DB1200_SD0_EJECT_INT);
enable_irq(DB1200_SD0_INSERT_INT);
}
static irqreturn_t db1200_mmc_cdfn(int irq, void *ptr)
{
void (*mmc_cd)(struct mmc_host *, unsigned long);
/* link against CONFIG_MMC=m */
mmc_cd = symbol_get(mmc_detect_change);
if (mmc_cd) {
mmc_cd(ptr, msecs_to_jiffies(500));
mmc_cd(ptr, msecs_to_jiffies(200));
symbol_put(mmc_detect_change);
}
msleep(100); /* debounce */
if (irq == DB1200_SD0_INSERT_INT)
enable_irq(DB1200_SD0_EJECT_INT);
else
enable_irq(DB1200_SD0_INSERT_INT);
return IRQ_HANDLED;
}
@@ -374,13 +378,13 @@ static int db1200_mmc_cd_setup(void *mmc_host, int en)
int ret;
if (en) {
ret = request_irq(DB1200_SD0_INSERT_INT, db1200_mmc_cd,
0, "sd_insert", mmc_host);
ret = request_threaded_irq(DB1200_SD0_INSERT_INT, db1200_mmc_cd,
db1200_mmc_cdfn, 0, "sd_insert", mmc_host);
if (ret)
goto out;
ret = request_irq(DB1200_SD0_EJECT_INT, db1200_mmc_cd,
0, "sd_eject", mmc_host);
ret = request_threaded_irq(DB1200_SD0_EJECT_INT, db1200_mmc_cd,
db1200_mmc_cdfn, 0, "sd_eject", mmc_host);
if (ret) {
free_irq(DB1200_SD0_INSERT_INT, mmc_host);
goto out;
@@ -436,23 +440,27 @@ static struct led_classdev db1200_mmc_led = {
static irqreturn_t pb1200_mmc1_cd(int irq, void *ptr)
{
void(*mmc_cd)(struct mmc_host *, unsigned long);
disable_irq_nosync(irq);
return IRQ_WAKE_THREAD;
}
if (irq == PB1200_SD1_INSERT_INT) {
disable_irq_nosync(PB1200_SD1_INSERT_INT);
enable_irq(PB1200_SD1_EJECT_INT);
} else {
disable_irq_nosync(PB1200_SD1_EJECT_INT);
enable_irq(PB1200_SD1_INSERT_INT);
}
static irqreturn_t pb1200_mmc1_cdfn(int irq, void *ptr)
{
void (*mmc_cd)(struct mmc_host *, unsigned long);
/* link against CONFIG_MMC=m */
mmc_cd = symbol_get(mmc_detect_change);
if (mmc_cd) {
mmc_cd(ptr, msecs_to_jiffies(500));
mmc_cd(ptr, msecs_to_jiffies(200));
symbol_put(mmc_detect_change);
}
msleep(100); /* debounce */
if (irq == PB1200_SD1_INSERT_INT)
enable_irq(PB1200_SD1_EJECT_INT);
else
enable_irq(PB1200_SD1_INSERT_INT);
return IRQ_HANDLED;
}
@@ -461,13 +469,13 @@ static int pb1200_mmc1_cd_setup(void *mmc_host, int en)
int ret;
if (en) {
ret = request_irq(PB1200_SD1_INSERT_INT, pb1200_mmc1_cd, 0,
"sd1_insert", mmc_host);
ret = request_threaded_irq(PB1200_SD1_INSERT_INT, pb1200_mmc1_cd,
pb1200_mmc1_cdfn, 0, "sd1_insert", mmc_host);
if (ret)
goto out;
ret = request_irq(PB1200_SD1_EJECT_INT, pb1200_mmc1_cd, 0,
"sd1_eject", mmc_host);
ret = request_threaded_irq(PB1200_SD1_EJECT_INT, pb1200_mmc1_cd,
pb1200_mmc1_cdfn, 0, "sd1_eject", mmc_host);
if (ret) {
free_irq(PB1200_SD1_INSERT_INT, mmc_host);
goto out;