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nvmem: resolve cells from DT at registration time

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Currently we're creating a new cell structure everytime a DT user
calls nvmem_cell_get().

Change this behavior by resolving the cells during nvmem provider
registration and adding all cells to the provider's list. Make
of_nvmem_cell_get() just parse the phandle and look the cell up
in the relevant provider's list.

Don't drop the cell in nvmem_cell_put().

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bartosz Golaszewski 2018-09-21 06:40:16 -07:00 committed by Greg Kroah-Hartman
parent b985f4cba6
commit e888d445ac
1 changed files with 75 additions and 48 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

123
drivers/nvmem/core.c
View File

@ -456,6 +456,73 @@ out:
return rval;
}
static struct nvmem_cell *
nvmem_find_cell_by_index(struct nvmem_device *nvmem, int index)
{
struct nvmem_cell *cell = NULL;
int i = 0;
mutex_lock(&nvmem_mutex);
list_for_each_entry(cell, &nvmem->cells, node) {
if (index == i++)
break;
}
mutex_unlock(&nvmem_mutex);
return cell;
}
static int nvmem_add_cells_from_of(struct nvmem_device *nvmem)
{
struct device_node *parent, *child;
struct device *dev = &nvmem->dev;
struct nvmem_cell *cell;
const __be32 *addr;
int len;
parent = dev->of_node;
for_each_child_of_node(parent, child) {
addr = of_get_property(child, "reg", &len);
if (!addr || (len < 2 * sizeof(u32))) {
dev_err(dev, "nvmem: invalid reg on %pOF\n", child);
return -EINVAL;
}
cell = kzalloc(sizeof(*cell), GFP_KERNEL);
if (!cell)
return -ENOMEM;
cell->nvmem = nvmem;
cell->offset = be32_to_cpup(addr++);
cell->bytes = be32_to_cpup(addr);
cell->name = child->name;
addr = of_get_property(child, "bits", &len);
if (addr && len == (2 * sizeof(u32))) {
cell->bit_offset = be32_to_cpup(addr++);
cell->nbits = be32_to_cpup(addr);
}
if (cell->nbits)
cell->bytes = DIV_ROUND_UP(
cell->nbits + cell->bit_offset,
BITS_PER_BYTE);
if (!IS_ALIGNED(cell->offset, nvmem->stride)) {
dev_err(dev, "cell %s unaligned to nvmem stride %d\n",
cell->name, nvmem->stride);
/* Cells already added will be freed later. */
kfree(cell);
return -EINVAL;
}
nvmem_cell_add(cell);
}
return 0;
}
/**
* nvmem_register() - Register a nvmem device for given nvmem_config.
* Also creates an binary entry in /sys/bus/nvmem/devices/dev-name/nvmem
@ -546,6 +613,10 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
if (rval)
goto err_remove_cells;
rval = nvmem_add_cells_from_of(nvmem);
if (rval)
goto err_remove_cells;
return nvmem;
err_remove_cells:
@ -848,10 +919,8 @@ struct nvmem_cell *of_nvmem_cell_get(struct device_node *np,
const char *name)
{
struct device_node *cell_np, *nvmem_np;
struct nvmem_cell *cell;
struct nvmem_device *nvmem;
const __be32 *addr;
int rval, len;
struct nvmem_cell *cell;
int index = 0;
/* if cell name exists, find index to the name */
@ -871,54 +940,13 @@ struct nvmem_cell *of_nvmem_cell_get(struct device_node *np,
if (IS_ERR(nvmem))
return ERR_CAST(nvmem);
addr = of_get_property(cell_np, "reg", &len);
if (!addr || (len < 2 * sizeof(u32))) {
dev_err(&nvmem->dev, "nvmem: invalid reg on %pOF\n",
cell_np);
rval = -EINVAL;
goto err_mem;
}
cell = kzalloc(sizeof(*cell), GFP_KERNEL);
cell = nvmem_find_cell_by_index(nvmem, index);
if (!cell) {
rval = -ENOMEM;
goto err_mem;
__nvmem_device_put(nvmem);
return ERR_PTR(-ENOENT);
}
cell->nvmem = nvmem;
cell->offset = be32_to_cpup(addr++);
cell->bytes = be32_to_cpup(addr);
cell->name = cell_np->name;
addr = of_get_property(cell_np, "bits", &len);
if (addr && len == (2 * sizeof(u32))) {
cell->bit_offset = be32_to_cpup(addr++);
cell->nbits = be32_to_cpup(addr);
}
if (cell->nbits)
cell->bytes = DIV_ROUND_UP(cell->nbits + cell->bit_offset,
BITS_PER_BYTE);
if (!IS_ALIGNED(cell->offset, nvmem->stride)) {
dev_err(&nvmem->dev,
"cell %s unaligned to nvmem stride %d\n",
cell->name, nvmem->stride);
rval = -EINVAL;
goto err_sanity;
}
nvmem_cell_add(cell);
return cell;
err_sanity:
kfree(cell);
err_mem:
__nvmem_device_put(nvmem);
return ERR_PTR(rval);
}
EXPORT_SYMBOL_GPL(of_nvmem_cell_get);
#endif
@ -1024,7 +1052,6 @@ void nvmem_cell_put(struct nvmem_cell *cell)
struct nvmem_device *nvmem = cell->nvmem;
__nvmem_device_put(nvmem);
nvmem_cell_drop(cell);
}
EXPORT_SYMBOL_GPL(nvmem_cell_put);