1 #include <linux/slab.h>
4 #include <linux/of_address.h>
5 #include <linux/reset-controller.h>
9 #define rcdev_to_unit(rcdev) container_of(rcdev, struct mmp_clk_reset_unit, rcdev)
11 static int mmp_of_reset_xlate(struct reset_controller_dev *rcdev,
12 const struct of_phandle_args *reset_spec)
14 struct mmp_clk_reset_unit *unit = rcdev_to_unit(rcdev);
15 struct mmp_clk_reset_cell *cell;
18 if (WARN_ON(reset_spec->args_count != rcdev->of_reset_n_cells))
21 for (i = 0; i < rcdev->nr_resets; i++) {
22 cell = &unit->cells[i];
23 if (cell->clk_id == reset_spec->args[0])
27 if (i == rcdev->nr_resets)
33 static int mmp_clk_reset_assert(struct reset_controller_dev *rcdev,
36 struct mmp_clk_reset_unit *unit = rcdev_to_unit(rcdev);
37 struct mmp_clk_reset_cell *cell;
38 unsigned long flags = 0;
41 cell = &unit->cells[id];
43 spin_lock_irqsave(cell->lock, flags);
45 val = readl(cell->reg);
47 writel(val, cell->reg);
50 spin_unlock_irqrestore(cell->lock, flags);
55 static int mmp_clk_reset_deassert(struct reset_controller_dev *rcdev,
58 struct mmp_clk_reset_unit *unit = rcdev_to_unit(rcdev);
59 struct mmp_clk_reset_cell *cell;
60 unsigned long flags = 0;
63 cell = &unit->cells[id];
65 spin_lock_irqsave(cell->lock, flags);
67 val = readl(cell->reg);
69 writel(val, cell->reg);
72 spin_unlock_irqrestore(cell->lock, flags);
77 static struct reset_control_ops mmp_clk_reset_ops = {
78 .assert = mmp_clk_reset_assert,
79 .deassert = mmp_clk_reset_deassert,
82 void mmp_clk_reset_register(struct device_node *np,
83 struct mmp_clk_reset_cell *cells, int nr_resets)
85 struct mmp_clk_reset_unit *unit;
87 unit = kzalloc(sizeof(*unit), GFP_KERNEL);
92 unit->rcdev.of_reset_n_cells = 1;
93 unit->rcdev.nr_resets = nr_resets;
94 unit->rcdev.ops = &mmp_clk_reset_ops;
95 unit->rcdev.of_node = np;
96 unit->rcdev.of_xlate = mmp_of_reset_xlate;
98 reset_controller_register(&unit->rcdev);