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author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-06-05 14:34:03 +0100 |
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committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-06-05 14:38:20 +0100 |
commit | a43fd50dc99a5f65505f174eca5a421707d73b4c (patch) | |
tree | 18292c81dca6e3511c30d148a09bbbed4871b2eb /drivers/base | |
parent | bfd6185ddecc6e6f6bd654c053c307c9e49ca391 (diff) | |
download | linux-stable-a43fd50dc99a5f65505f174eca5a421707d73b4c.tar.gz linux-stable-a43fd50dc99a5f65505f174eca5a421707d73b4c.tar.bz2 linux-stable-a43fd50dc99a5f65505f174eca5a421707d73b4c.zip |
regmap: Implement support for wake IRQs
Allow chips to provide a bank of registers for controlling the wake state
in a similar fashion to the masks and propagate the wake count to the
parent interrupt controller.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'drivers/base')
-rw-r--r-- | drivers/base/regmap/regmap-irq.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/drivers/base/regmap/regmap-irq.c b/drivers/base/regmap/regmap-irq.c index b74e14c4dff4..b480b529f020 100644 --- a/drivers/base/regmap/regmap-irq.c +++ b/drivers/base/regmap/regmap-irq.c @@ -29,9 +29,13 @@ struct regmap_irq_chip_data { int irq_base; struct irq_domain *domain; + int irq; + int wake_count; + unsigned int *status_buf; unsigned int *mask_buf; unsigned int *mask_buf_def; + unsigned int *wake_buf; unsigned int irq_reg_stride; }; @@ -71,6 +75,16 @@ static void regmap_irq_sync_unlock(struct irq_data *data) d->chip->mask_base + (i * map->reg_stride)); } + /* If we've changed our wakeup count propagate it to the parent */ + if (d->wake_count < 0) + for (i = d->wake_count; i < 0; i++) + irq_set_irq_wake(d->irq, 0); + else if (d->wake_count > 0) + for (i = 0; i < d->wake_count; i++) + irq_set_irq_wake(d->irq, 1); + + d->wake_count = 0; + mutex_unlock(&d->lock); } @@ -92,12 +106,35 @@ static void regmap_irq_disable(struct irq_data *data) d->mask_buf[irq_data->reg_offset / map->reg_stride] |= irq_data->mask; } +static int regmap_irq_set_wake(struct irq_data *data, unsigned int on) +{ + struct regmap_irq_chip_data *d = irq_data_get_irq_chip_data(data); + struct regmap *map = d->map; + const struct regmap_irq *irq_data = irq_to_regmap_irq(d, data->hwirq); + + if (!d->chip->wake_base) + return -EINVAL; + + if (on) { + d->wake_buf[irq_data->reg_offset / map->reg_stride] + &= ~irq_data->mask; + d->wake_count++; + } else { + d->wake_buf[irq_data->reg_offset / map->reg_stride] + |= irq_data->mask; + d->wake_count--; + } + + return 0; +} + static struct irq_chip regmap_irq_chip = { .name = "regmap", .irq_bus_lock = regmap_irq_lock, .irq_bus_sync_unlock = regmap_irq_sync_unlock, .irq_disable = regmap_irq_disable, .irq_enable = regmap_irq_enable, + .irq_set_wake = regmap_irq_set_wake, }; static irqreturn_t regmap_irq_thread(int irq, void *d) @@ -240,6 +277,14 @@ int regmap_add_irq_chip(struct regmap *map, int irq, int irq_flags, if (!d->mask_buf_def) goto err_alloc; + if (chip->wake_base) { + d->wake_buf = kzalloc(sizeof(unsigned int) * chip->num_regs, + GFP_KERNEL); + if (!d->wake_buf) + goto err_alloc; + } + + d->irq = irq; d->map = map; d->chip = chip; d->irq_base = irq_base; @@ -294,6 +339,7 @@ int regmap_add_irq_chip(struct regmap *map, int irq, int irq_flags, err_domain: /* Should really dispose of the domain but... */ err_alloc: + kfree(d->wake_buf); kfree(d->mask_buf_def); kfree(d->mask_buf); kfree(d->status_buf); @@ -315,6 +361,7 @@ void regmap_del_irq_chip(int irq, struct regmap_irq_chip_data *d) free_irq(irq, d); /* We should unmap the domain but... */ + kfree(d->wake_buf); kfree(d->mask_buf_def); kfree(d->mask_buf); kfree(d->status_buf); |