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path: root/drivers/base/regmap/regmap-irq.c
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Diffstat (limited to 'drivers/base/regmap/regmap-irq.c')
-rw-r--r--drivers/base/regmap/regmap-irq.c187
1 files changed, 153 insertions, 34 deletions
diff --git a/drivers/base/regmap/regmap-irq.c b/drivers/base/regmap/regmap-irq.c
index 5972ad95854..6299a50a596 100644
--- a/drivers/base/regmap/regmap-irq.c
+++ b/drivers/base/regmap/regmap-irq.c
@@ -10,13 +10,13 @@
* published by the Free Software Foundation.
*/
-#include <linux/export.h>
#include <linux/device.h>
-#include <linux/regmap.h>
-#include <linux/irq.h>
+#include <linux/export.h>
#include <linux/interrupt.h>
+#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
#include <linux/slab.h>
#include "internal.h"
@@ -34,6 +34,7 @@ struct regmap_irq_chip_data {
int irq;
int wake_count;
+ void *status_reg_buf;
unsigned int *status_buf;
unsigned int *mask_buf;
unsigned int *mask_buf_def;
@@ -87,6 +88,39 @@ static void regmap_irq_sync_unlock(struct irq_data *data)
if (ret != 0)
dev_err(d->map->dev, "Failed to sync masks in %x\n",
reg);
+
+ reg = d->chip->wake_base +
+ (i * map->reg_stride * d->irq_reg_stride);
+ if (d->wake_buf) {
+ if (d->chip->wake_invert)
+ ret = regmap_update_bits(d->map, reg,
+ d->mask_buf_def[i],
+ ~d->wake_buf[i]);
+ else
+ ret = regmap_update_bits(d->map, reg,
+ d->mask_buf_def[i],
+ d->wake_buf[i]);
+ if (ret != 0)
+ dev_err(d->map->dev,
+ "Failed to sync wakes in %x: %d\n",
+ reg, ret);
+ }
+
+ if (!d->chip->init_ack_masked)
+ continue;
+ /*
+ * Ack all the masked interrupts uncondictionly,
+ * OR if there is masked interrupt which hasn't been Acked,
+ * it'll be ignored in irq handler, then may introduce irq storm
+ */
+ if (d->mask_buf[i] && (d->chip->ack_base || d->chip->use_ack)) {
+ reg = d->chip->ack_base +
+ (i * map->reg_stride * d->irq_reg_stride);
+ ret = regmap_write(map, reg, d->mask_buf[i]);
+ if (ret != 0)
+ dev_err(d->map->dev, "Failed to ack 0x%x: %d\n",
+ reg, ret);
+ }
}
if (d->chip->runtime_pm)
@@ -129,16 +163,15 @@ static int regmap_irq_set_wake(struct irq_data *data, unsigned int on)
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;
+ if (d->wake_buf)
+ 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;
+ if (d->wake_buf)
+ d->wake_buf[irq_data->reg_offset / map->reg_stride]
+ |= irq_data->mask;
d->wake_count--;
}
@@ -167,33 +200,78 @@ static irqreturn_t regmap_irq_thread(int irq, void *d)
if (ret < 0) {
dev_err(map->dev, "IRQ thread failed to resume: %d\n",
ret);
+ pm_runtime_put(map->dev);
return IRQ_NONE;
}
}
/*
- * Ignore masked IRQs and ack if we need to; we ack early so
- * there is no race between handling and acknowleding the
- * interrupt. We assume that typically few of the interrupts
- * will fire simultaneously so don't worry about overhead from
- * doing a write per register.
+ * Read in the statuses, using a single bulk read if possible
+ * in order to reduce the I/O overheads.
*/
- for (i = 0; i < data->chip->num_regs; i++) {
- ret = regmap_read(map, chip->status_base + (i * map->reg_stride
- * data->irq_reg_stride),
- &data->status_buf[i]);
+ if (!map->use_single_rw && map->reg_stride == 1 &&
+ data->irq_reg_stride == 1) {
+ u8 *buf8 = data->status_reg_buf;
+ u16 *buf16 = data->status_reg_buf;
+ u32 *buf32 = data->status_reg_buf;
+ BUG_ON(!data->status_reg_buf);
+
+ ret = regmap_bulk_read(map, chip->status_base,
+ data->status_reg_buf,
+ chip->num_regs);
if (ret != 0) {
dev_err(map->dev, "Failed to read IRQ status: %d\n",
- ret);
- if (chip->runtime_pm)
- pm_runtime_put(map->dev);
+ ret);
return IRQ_NONE;
}
+ for (i = 0; i < data->chip->num_regs; i++) {
+ switch (map->format.val_bytes) {
+ case 1:
+ data->status_buf[i] = buf8[i];
+ break;
+ case 2:
+ data->status_buf[i] = buf16[i];
+ break;
+ case 4:
+ data->status_buf[i] = buf32[i];
+ break;
+ default:
+ BUG();
+ return IRQ_NONE;
+ }
+ }
+
+ } else {
+ for (i = 0; i < data->chip->num_regs; i++) {
+ ret = regmap_read(map, chip->status_base +
+ (i * map->reg_stride
+ * data->irq_reg_stride),
+ &data->status_buf[i]);
+
+ if (ret != 0) {
+ dev_err(map->dev,
+ "Failed to read IRQ status: %d\n",
+ ret);
+ if (chip->runtime_pm)
+ pm_runtime_put(map->dev);
+ return IRQ_NONE;
+ }
+ }
+ }
+
+ /*
+ * Ignore masked IRQs and ack if we need to; we ack early so
+ * there is no race between handling and acknowleding the
+ * interrupt. We assume that typically few of the interrupts
+ * will fire simultaneously so don't worry about overhead from
+ * doing a write per register.
+ */
+ for (i = 0; i < data->chip->num_regs; i++) {
data->status_buf[i] &= ~data->mask_buf[i];
- if (data->status_buf[i] && chip->ack_base) {
+ if (data->status_buf[i] && (chip->ack_base || chip->use_ack)) {
reg = chip->ack_base +
(i * map->reg_stride * data->irq_reg_stride);
ret = regmap_write(map, reg, data->status_buf[i]);
@@ -269,6 +347,9 @@ int regmap_add_irq_chip(struct regmap *map, int irq, int irq_flags,
int ret = -ENOMEM;
u32 reg;
+ if (chip->num_regs <= 0)
+ return -EINVAL;
+
for (i = 0; i < chip->num_irqs; i++) {
if (chip->irqs[i].reg_offset % map->reg_stride)
return -EINVAL;
@@ -290,8 +371,6 @@ int regmap_add_irq_chip(struct regmap *map, int irq, int irq_flags,
if (!d)
return -ENOMEM;
- *data = d;
-
d->status_buf = kzalloc(sizeof(unsigned int) * chip->num_regs,
GFP_KERNEL);
if (!d->status_buf)
@@ -316,11 +395,6 @@ int regmap_add_irq_chip(struct regmap *map, int irq, int irq_flags,
d->irq_chip = regmap_irq_chip;
d->irq_chip.name = chip->name;
- if (!chip->wake_base) {
- d->irq_chip.irq_set_wake = NULL;
- d->irq_chip.flags |= IRQCHIP_MASK_ON_SUSPEND |
- IRQCHIP_SKIP_SET_WAKE;
- }
d->irq = irq;
d->map = map;
d->chip = chip;
@@ -331,6 +405,14 @@ int regmap_add_irq_chip(struct regmap *map, int irq, int irq_flags,
else
d->irq_reg_stride = 1;
+ if (!map->use_single_rw && map->reg_stride == 1 &&
+ d->irq_reg_stride == 1) {
+ d->status_reg_buf = kmalloc(map->format.val_bytes *
+ chip->num_regs, GFP_KERNEL);
+ if (!d->status_reg_buf)
+ goto err_alloc;
+ }
+
mutex_init(&d->lock);
for (i = 0; i < chip->num_irqs; i++)
@@ -353,6 +435,31 @@ 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 || chip->use_ack)) {
+ 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 */
@@ -361,8 +468,15 @@ int regmap_add_irq_chip(struct regmap *map, int irq, int irq_flags,
d->wake_buf[i] = d->mask_buf_def[i];
reg = chip->wake_base +
(i * map->reg_stride * d->irq_reg_stride);
- ret = regmap_update_bits(map, reg, d->wake_buf[i],
- d->wake_buf[i]);
+
+ if (chip->wake_invert)
+ ret = regmap_update_bits(map, reg,
+ d->mask_buf_def[i],
+ 0);
+ else
+ ret = regmap_update_bits(map, reg,
+ d->mask_buf_def[i],
+ d->wake_buf[i]);
if (ret != 0) {
dev_err(map->dev, "Failed to set masks in 0x%x: %d\n",
reg, ret);
@@ -388,10 +502,13 @@ int regmap_add_irq_chip(struct regmap *map, int irq, int irq_flags,
ret = request_threaded_irq(irq, NULL, regmap_irq_thread, irq_flags,
chip->name, d);
if (ret != 0) {
- dev_err(map->dev, "Failed to request IRQ %d: %d\n", irq, ret);
+ dev_err(map->dev, "Failed to request IRQ %d for %s: %d\n",
+ irq, chip->name, ret);
goto err_domain;
}
+ *data = d;
+
return 0;
err_domain:
@@ -401,6 +518,7 @@ err_alloc:
kfree(d->mask_buf_def);
kfree(d->mask_buf);
kfree(d->status_buf);
+ kfree(d->status_reg_buf);
kfree(d);
return ret;
}
@@ -418,10 +536,11 @@ void regmap_del_irq_chip(int irq, struct regmap_irq_chip_data *d)
return;
free_irq(irq, d);
- /* We should unmap the domain but... */
+ irq_domain_remove(d->domain);
kfree(d->wake_buf);
kfree(d->mask_buf_def);
kfree(d->mask_buf);
+ kfree(d->status_reg_buf);
kfree(d->status_buf);
kfree(d);
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 12:20:01 +0000