101 lines
2.2 KiB
C
101 lines
2.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/reset-controller.h>
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#include "reset.h"
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#define rcdev_to_unit(rcdev) container_of(rcdev, struct mmp_clk_reset_unit, rcdev)
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static int mmp_of_reset_xlate(struct reset_controller_dev *rcdev,
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const struct of_phandle_args *reset_spec)
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{
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struct mmp_clk_reset_unit *unit = rcdev_to_unit(rcdev);
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struct mmp_clk_reset_cell *cell;
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int i;
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if (WARN_ON(reset_spec->args_count != rcdev->of_reset_n_cells))
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return -EINVAL;
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for (i = 0; i < rcdev->nr_resets; i++) {
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cell = &unit->cells[i];
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if (cell->clk_id == reset_spec->args[0])
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break;
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}
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if (i == rcdev->nr_resets)
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return -EINVAL;
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return i;
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}
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static int mmp_clk_reset_assert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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struct mmp_clk_reset_unit *unit = rcdev_to_unit(rcdev);
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struct mmp_clk_reset_cell *cell;
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unsigned long flags = 0;
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u32 val;
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cell = &unit->cells[id];
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if (cell->lock)
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spin_lock_irqsave(cell->lock, flags);
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val = readl(cell->reg);
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val |= cell->bits;
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writel(val, cell->reg);
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if (cell->lock)
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spin_unlock_irqrestore(cell->lock, flags);
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return 0;
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}
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static int mmp_clk_reset_deassert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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struct mmp_clk_reset_unit *unit = rcdev_to_unit(rcdev);
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struct mmp_clk_reset_cell *cell;
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unsigned long flags = 0;
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u32 val;
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cell = &unit->cells[id];
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if (cell->lock)
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spin_lock_irqsave(cell->lock, flags);
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val = readl(cell->reg);
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val &= ~cell->bits;
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writel(val, cell->reg);
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if (cell->lock)
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spin_unlock_irqrestore(cell->lock, flags);
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return 0;
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}
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static const struct reset_control_ops mmp_clk_reset_ops = {
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.assert = mmp_clk_reset_assert,
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.deassert = mmp_clk_reset_deassert,
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};
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void mmp_clk_reset_register(struct device_node *np,
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struct mmp_clk_reset_cell *cells, int nr_resets)
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{
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struct mmp_clk_reset_unit *unit;
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unit = kzalloc(sizeof(*unit), GFP_KERNEL);
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if (!unit)
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return;
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unit->cells = cells;
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unit->rcdev.of_reset_n_cells = 1;
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unit->rcdev.nr_resets = nr_resets;
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unit->rcdev.ops = &mmp_clk_reset_ops;
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unit->rcdev.of_node = np;
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unit->rcdev.of_xlate = mmp_of_reset_xlate;
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reset_controller_register(&unit->rcdev);
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}
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