Merge branch 'kvm-arm/vgic-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git...

[firefly-linux-kernel-4.4.55.git] / drivers / base / regmap / regmap-irq.c

diff --git a/drivers/base/regmap/regmap-irq.c b/drivers/base/regmap/regmap-irq.c
index 5972ad958544e3c875a2196294d83c74d7e44cc9..020ea2b9fd2f347a0ac71119a9213bb1c655ae33 100644 (file)
--- a/drivers/base/regmap/regmap-irq.c
+++ b/drivers/base/regmap/regmap-irq.c
@@ -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 +88,23 @@ 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->runtime_pm)
@@ -129,16 +147,15 @@ 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--;
        }
 
@@ -167,30 +184,75 @@ 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) {
@@ -316,11 +378,6 @@ 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 +388,14 @@ 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++)
@@ -361,8 +426,15 @@ 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);
@@ -401,6 +473,7 @@ err_alloc:
        kfree(d->mask_buf_def);
        kfree(d->mask_buf);
        kfree(d->status_buf);
+       kfree(d->status_reg_buf);
        kfree(d);
        return ret;
 }
@@ -422,6 +495,7 @@ void regmap_del_irq_chip(int irq, struct regmap_irq_chip_data *d)
        kfree(d->wake_buf);
        kfree(d->mask_buf_def);
        kfree(d->mask_buf);
+       kfree(d->status_reg_buf);
        kfree(d->status_buf);
        kfree(d);
 }