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Merge tag 'regmap-v5.1' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap

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Pull regmap updates from Mark Brown:
 "There are only two changes here:

   - fix for conflicting attributes on the rbtree node structure

   - implementation of main status register support in the interrupt
     code which supports chips that have a register to cut down on the
     number of per-interrupt status registers that need to be checked
     when handling interrupts"

* tag 'regmap-v5.1' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap:
  regmap: Remove attribute packed from struct 'regcache_rbtree_node'
  regmap: regmap-irq: Add main status register support
This commit is contained in:
Linus Torvalds
2019-03-04 19:16:09 -08:00
parent 42eaf1851e 66fb181d6f
commit e48b044e4f
3 changed files with 127 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/base/regmap/regcache-rbtree.c
View File

@@ -33,7 +33,7 @@ struct regcache_rbtree_node {
unsigned int blklen;
/* the actual rbtree node holding this block */
struct rb_node node;
} __attribute__ ((packed));
};
struct regcache_rbtree_ctx {
struct rb_root root;

99
drivers/base/regmap/regmap-irq.c
View File

@@ -35,6 +35,7 @@ struct regmap_irq_chip_data {
int wake_count;
void *status_reg_buf;
unsigned int *main_status_buf;
unsigned int *status_buf;
unsigned int *mask_buf;
unsigned int *mask_buf_def;
@@ -329,6 +330,33 @@ static const struct irq_chip regmap_irq_chip = {
.irq_set_wake = regmap_irq_set_wake,
};
static inline int read_sub_irq_data(struct regmap_irq_chip_data *data,
unsigned int b)
{
const struct regmap_irq_chip *chip = data->chip;
struct regmap *map = data->map;
struct regmap_irq_sub_irq_map *subreg;
int i, ret = 0;
if (!chip->sub_reg_offsets) {
/* Assume linear mapping */
ret = regmap_read(map, chip->status_base +
(b * map->reg_stride * data->irq_reg_stride),
&data->status_buf[b]);
} else {
subreg = &chip->sub_reg_offsets[b];
for (i = 0; i < subreg->num_regs; i++) {
unsigned int offset = subreg->offset[i];
ret = regmap_read(map, chip->status_base + offset,
&data->status_buf[offset]);
if (ret)
break;
}
}
return ret;
}
static irqreturn_t regmap_irq_thread(int irq, void *d)
{
struct regmap_irq_chip_data *data = d;
@@ -352,11 +380,65 @@ static irqreturn_t regmap_irq_thread(int irq, void *d)
}
/*
* Read in the statuses, using a single bulk read if possible
* in order to reduce the I/O overheads.
* Read only registers with active IRQs if the chip has 'main status
* register'. Else read in the statuses, using a single bulk read if
* possible in order to reduce the I/O overheads.
*/
if (!map->use_single_read && map->reg_stride == 1 &&
data->irq_reg_stride == 1) {
if (chip->num_main_regs) {
unsigned int max_main_bits;
unsigned long size;
size = chip->num_regs * sizeof(unsigned int);
max_main_bits = (chip->num_main_status_bits) ?
chip->num_main_status_bits : chip->num_regs;
/* Clear the status buf as we don't read all status regs */
memset(data->status_buf, 0, size);
/* We could support bulk read for main status registers
* but I don't expect to see devices with really many main
* status registers so let's only support single reads for the
* sake of simplicity. and add bulk reads only if needed
*/
for (i = 0; i < chip->num_main_regs; i++) {
ret = regmap_read(map, chip->main_status +
(i * map->reg_stride
* data->irq_reg_stride),
&data->main_status_buf[i]);
if (ret) {
dev_err(map->dev,
"Failed to read IRQ status %d\n",
ret);
goto exit;
}
}
/* Read sub registers with active IRQs */
for (i = 0; i < chip->num_main_regs; i++) {
unsigned int b;
const unsigned long mreg = data->main_status_buf[i];
for_each_set_bit(b, &mreg, map->format.val_bytes * 8) {
if (i * map->format.val_bytes * 8 + b >
max_main_bits)
break;
ret = read_sub_irq_data(data, b);
if (ret != 0) {
dev_err(map->dev,
"Failed to read IRQ status %d\n",
ret);
if (chip->runtime_pm)
pm_runtime_put(map->dev);
goto exit;
}
}
}
} else if (!map->use_single_read && 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;
@@ -521,6 +603,15 @@ int regmap_add_irq_chip(struct regmap *map, int irq, int irq_flags,
if (!d)
return -ENOMEM;
if (chip->num_main_regs) {
d->main_status_buf = kcalloc(chip->num_main_regs,
sizeof(unsigned int),
GFP_KERNEL);
if (!d->main_status_buf)
goto err_alloc;
}
d->status_buf = kcalloc(chip->num_regs, sizeof(unsigned int),
GFP_KERNEL);
if (!d->status_buf)