blob: b54da1fe73f07ea5f36a82ac33da211b9cc375a1 [file] [log] [blame]
Chao Xieae32a5b2014-10-31 10:13:48 +08001#include <linux/slab.h>
2#include <linux/io.h>
3#include <linux/of.h>
4#include <linux/of_address.h>
5#include <linux/reset-controller.h>
6
7#include "reset.h"
8
9#define rcdev_to_unit(rcdev) container_of(rcdev, struct mmp_clk_reset_unit, rcdev)
10
11static int mmp_of_reset_xlate(struct reset_controller_dev *rcdev,
12 const struct of_phandle_args *reset_spec)
13{
14 struct mmp_clk_reset_unit *unit = rcdev_to_unit(rcdev);
15 struct mmp_clk_reset_cell *cell;
16 int i;
17
18 if (WARN_ON(reset_spec->args_count != rcdev->of_reset_n_cells))
19 return -EINVAL;
20
21 for (i = 0; i < rcdev->nr_resets; i++) {
22 cell = &unit->cells[i];
23 if (cell->clk_id == reset_spec->args[0])
24 break;
25 }
26
27 if (i == rcdev->nr_resets)
28 return -EINVAL;
29
30 return i;
31}
32
33static int mmp_clk_reset_assert(struct reset_controller_dev *rcdev,
34 unsigned long id)
35{
36 struct mmp_clk_reset_unit *unit = rcdev_to_unit(rcdev);
37 struct mmp_clk_reset_cell *cell;
38 unsigned long flags = 0;
39 u32 val;
40
41 cell = &unit->cells[id];
42 if (cell->lock)
43 spin_lock_irqsave(cell->lock, flags);
44
45 val = readl(cell->reg);
46 val |= cell->bits;
47 writel(val, cell->reg);
48
49 if (cell->lock)
50 spin_unlock_irqrestore(cell->lock, flags);
51
52 return 0;
53}
54
55static int mmp_clk_reset_deassert(struct reset_controller_dev *rcdev,
56 unsigned long id)
57{
58 struct mmp_clk_reset_unit *unit = rcdev_to_unit(rcdev);
59 struct mmp_clk_reset_cell *cell;
60 unsigned long flags = 0;
61 u32 val;
62
63 cell = &unit->cells[id];
64 if (cell->lock)
65 spin_lock_irqsave(cell->lock, flags);
66
67 val = readl(cell->reg);
68 val &= ~cell->bits;
69 writel(val, cell->reg);
70
71 if (cell->lock)
72 spin_unlock_irqrestore(cell->lock, flags);
73
74 return 0;
75}
76
77static struct reset_control_ops mmp_clk_reset_ops = {
78 .assert = mmp_clk_reset_assert,
79 .deassert = mmp_clk_reset_deassert,
80};
81
82void mmp_clk_reset_register(struct device_node *np,
83 struct mmp_clk_reset_cell *cells, int nr_resets)
84{
85 struct mmp_clk_reset_unit *unit;
86
87 unit = kzalloc(sizeof(*unit), GFP_KERNEL);
88 if (!unit)
89 return;
90
91 unit->cells = cells;
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;
97
98 reset_controller_register(&unit->rcdev);
99}