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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
ae32a5b3 CX |
2 | #include <linux/slab.h> |
3 | #include <linux/io.h> | |
4 | #include <linux/of.h> | |
5 | #include <linux/of_address.h> | |
6 | #include <linux/reset-controller.h> | |
7 | ||
8 | #include "reset.h" | |
9 | ||
10 | #define rcdev_to_unit(rcdev) container_of(rcdev, struct mmp_clk_reset_unit, rcdev) | |
11 | ||
12 | static int mmp_of_reset_xlate(struct reset_controller_dev *rcdev, | |
13 | const struct of_phandle_args *reset_spec) | |
14 | { | |
15 | struct mmp_clk_reset_unit *unit = rcdev_to_unit(rcdev); | |
16 | struct mmp_clk_reset_cell *cell; | |
17 | int i; | |
18 | ||
19 | if (WARN_ON(reset_spec->args_count != rcdev->of_reset_n_cells)) | |
20 | return -EINVAL; | |
21 | ||
22 | for (i = 0; i < rcdev->nr_resets; i++) { | |
23 | cell = &unit->cells[i]; | |
24 | if (cell->clk_id == reset_spec->args[0]) | |
25 | break; | |
26 | } | |
27 | ||
28 | if (i == rcdev->nr_resets) | |
29 | return -EINVAL; | |
30 | ||
31 | return i; | |
32 | } | |
33 | ||
34 | static int mmp_clk_reset_assert(struct reset_controller_dev *rcdev, | |
35 | unsigned long id) | |
36 | { | |
37 | struct mmp_clk_reset_unit *unit = rcdev_to_unit(rcdev); | |
38 | struct mmp_clk_reset_cell *cell; | |
39 | unsigned long flags = 0; | |
40 | u32 val; | |
41 | ||
42 | cell = &unit->cells[id]; | |
43 | if (cell->lock) | |
44 | spin_lock_irqsave(cell->lock, flags); | |
45 | ||
46 | val = readl(cell->reg); | |
47 | val |= cell->bits; | |
48 | writel(val, cell->reg); | |
49 | ||
50 | if (cell->lock) | |
51 | spin_unlock_irqrestore(cell->lock, flags); | |
52 | ||
53 | return 0; | |
54 | } | |
55 | ||
56 | static int mmp_clk_reset_deassert(struct reset_controller_dev *rcdev, | |
57 | unsigned long id) | |
58 | { | |
59 | struct mmp_clk_reset_unit *unit = rcdev_to_unit(rcdev); | |
60 | struct mmp_clk_reset_cell *cell; | |
61 | unsigned long flags = 0; | |
62 | u32 val; | |
63 | ||
64 | cell = &unit->cells[id]; | |
65 | if (cell->lock) | |
66 | spin_lock_irqsave(cell->lock, flags); | |
67 | ||
68 | val = readl(cell->reg); | |
69 | val &= ~cell->bits; | |
70 | writel(val, cell->reg); | |
71 | ||
72 | if (cell->lock) | |
73 | spin_unlock_irqrestore(cell->lock, flags); | |
74 | ||
75 | return 0; | |
76 | } | |
77 | ||
fd92f41d | 78 | static const struct reset_control_ops mmp_clk_reset_ops = { |
ae32a5b3 CX |
79 | .assert = mmp_clk_reset_assert, |
80 | .deassert = mmp_clk_reset_deassert, | |
81 | }; | |
82 | ||
83 | void mmp_clk_reset_register(struct device_node *np, | |
84 | struct mmp_clk_reset_cell *cells, int nr_resets) | |
85 | { | |
86 | struct mmp_clk_reset_unit *unit; | |
87 | ||
88 | unit = kzalloc(sizeof(*unit), GFP_KERNEL); | |
89 | if (!unit) | |
90 | return; | |
91 | ||
92 | unit->cells = cells; | |
93 | unit->rcdev.of_reset_n_cells = 1; | |
94 | unit->rcdev.nr_resets = nr_resets; | |
95 | unit->rcdev.ops = &mmp_clk_reset_ops; | |
96 | unit->rcdev.of_node = np; | |
97 | unit->rcdev.of_xlate = mmp_of_reset_xlate; | |
98 | ||
99 | reset_controller_register(&unit->rcdev); | |
100 | } |