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ae32a5b3 CX |
1 | #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 | ||
11 | static 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 | ||
33 | static 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 | ||
55 | static 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 | ||
fd92f41d | 77 | static const struct reset_control_ops mmp_clk_reset_ops = { |
ae32a5b3 CX |
78 | .assert = mmp_clk_reset_assert, |
79 | .deassert = mmp_clk_reset_deassert, | |
80 | }; | |
81 | ||
82 | void 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 | } |