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regmap: Support for acknowledging masked IRQs 

Some devices need interrupts to be clear when they are masked otherwise
 the interrupt is not deasserted by the mask being set - add support for
 this to regmap-irq from Philipp Zabel.
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Merge tag 'regmap-irq-ack-mask' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap

regmap: Support for acknowledging masked IRQs

Some devices need interrupts to be clear when they are masked otherwise
the interrupt is not deasserted by the mask being set - add support for
this to regmap-irq from Philipp Zabel.
This commit is contained in:
Samuel Ortiz 2013-08-20 03:07:25 +02:00
parent 38c4faaea4 68622bdfef
commit a849212f6e
2 changed files with 32 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
drivers/base/regmap/regmap-irq.c
View File

@ -418,6 +418,31 @@ int regmap_add_irq_chip(struct regmap *map, int irq, int irq_flags,
reg, ret);
goto err_alloc;
}
if (!chip->init_ack_masked)
continue;
/* Ack masked but set interrupts */
reg = chip->status_base +
(i * map->reg_stride * d->irq_reg_stride);
ret = regmap_read(map, reg, &d->status_buf[i]);
if (ret != 0) {
dev_err(map->dev, "Failed to read IRQ status: %d\n",
ret);
goto err_alloc;
}
if (d->status_buf[i] && chip->ack_base) {
reg = chip->ack_base +
(i * map->reg_stride * d->irq_reg_stride);
ret = regmap_write(map, reg,
d->status_buf[i] & d->mask_buf[i]);
if (ret != 0) {
dev_err(map->dev, "Failed to ack 0x%x: %d\n",
reg, ret);
goto err_alloc;
}
}
}
/* Wake is disabled by default */

10
include/linux/regmap.h
View File

@ -470,6 +470,9 @@ struct regmap_irq {
* @ack_base: Base ack address. If zero then the chip is clear on read.
* @wake_base: Base address for wake enables. If zero unsupported.
* @irq_reg_stride: Stride to use for chips where registers are not contiguous.
* @init_ack_masked: Ack all masked interrupts once during initalization.
* @mask_invert: Inverted mask register: cleared bits are masked out.
* @wake_invert: Inverted wake register: cleared bits are wake enabled.
* @runtime_pm: Hold a runtime PM lock on the device when accessing it.
*
* @num_regs: Number of registers in each control bank.
@ -485,9 +488,10 @@ struct regmap_irq_chip {
unsigned int ack_base;
unsigned int wake_base;
unsigned int irq_reg_stride;
unsigned int mask_invert;
unsigned int wake_invert;
bool runtime_pm;
bool init_ack_masked:1;
bool mask_invert:1;
bool wake_invert:1;
bool runtime_pm:1;
int num_regs;