Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Chao Xie | ae32a5b | 2014-10-31 10:13:48 +0800 | [diff] [blame] | 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 | |
Philipp Zabel | fd92f41 | 2016-02-25 10:45:07 +0100 | [diff] [blame] | 78 | static const struct reset_control_ops mmp_clk_reset_ops = { |
Chao Xie | ae32a5b | 2014-10-31 10:13:48 +0800 | [diff] [blame] | 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 | } |