100 lines
2.2 KiB
C
100 lines
2.2 KiB
C
#include <linux/slab.h>
|
|
#include <linux/io.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/reset-controller.h>
|
|
|
|
#include "reset.h"
|
|
|
|
#define rcdev_to_unit(rcdev) container_of(rcdev, struct mmp_clk_reset_unit, rcdev)
|
|
|
|
static int mmp_of_reset_xlate(struct reset_controller_dev *rcdev,
|
|
const struct of_phandle_args *reset_spec)
|
|
{
|
|
struct mmp_clk_reset_unit *unit = rcdev_to_unit(rcdev);
|
|
struct mmp_clk_reset_cell *cell;
|
|
int i;
|
|
|
|
if (WARN_ON(reset_spec->args_count != rcdev->of_reset_n_cells))
|
|
return -EINVAL;
|
|
|
|
for (i = 0; i < rcdev->nr_resets; i++) {
|
|
cell = &unit->cells[i];
|
|
if (cell->clk_id == reset_spec->args[0])
|
|
break;
|
|
}
|
|
|
|
if (i == rcdev->nr_resets)
|
|
return -EINVAL;
|
|
|
|
return i;
|
|
}
|
|
|
|
static int mmp_clk_reset_assert(struct reset_controller_dev *rcdev,
|
|
unsigned long id)
|
|
{
|
|
struct mmp_clk_reset_unit *unit = rcdev_to_unit(rcdev);
|
|
struct mmp_clk_reset_cell *cell;
|
|
unsigned long flags = 0;
|
|
u32 val;
|
|
|
|
cell = &unit->cells[id];
|
|
if (cell->lock)
|
|
spin_lock_irqsave(cell->lock, flags);
|
|
|
|
val = readl(cell->reg);
|
|
val |= cell->bits;
|
|
writel(val, cell->reg);
|
|
|
|
if (cell->lock)
|
|
spin_unlock_irqrestore(cell->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mmp_clk_reset_deassert(struct reset_controller_dev *rcdev,
|
|
unsigned long id)
|
|
{
|
|
struct mmp_clk_reset_unit *unit = rcdev_to_unit(rcdev);
|
|
struct mmp_clk_reset_cell *cell;
|
|
unsigned long flags = 0;
|
|
u32 val;
|
|
|
|
cell = &unit->cells[id];
|
|
if (cell->lock)
|
|
spin_lock_irqsave(cell->lock, flags);
|
|
|
|
val = readl(cell->reg);
|
|
val &= ~cell->bits;
|
|
writel(val, cell->reg);
|
|
|
|
if (cell->lock)
|
|
spin_unlock_irqrestore(cell->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct reset_control_ops mmp_clk_reset_ops = {
|
|
.assert = mmp_clk_reset_assert,
|
|
.deassert = mmp_clk_reset_deassert,
|
|
};
|
|
|
|
void mmp_clk_reset_register(struct device_node *np,
|
|
struct mmp_clk_reset_cell *cells, int nr_resets)
|
|
{
|
|
struct mmp_clk_reset_unit *unit;
|
|
|
|
unit = kzalloc(sizeof(*unit), GFP_KERNEL);
|
|
if (!unit)
|
|
return;
|
|
|
|
unit->cells = cells;
|
|
unit->rcdev.of_reset_n_cells = 1;
|
|
unit->rcdev.nr_resets = nr_resets;
|
|
unit->rcdev.ops = &mmp_clk_reset_ops;
|
|
unit->rcdev.of_node = np;
|
|
unit->rcdev.of_xlate = mmp_of_reset_xlate;
|
|
|
|
reset_controller_register(&unit->rcdev);
|
|
}
|