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106 lines
2.4 KiB
106 lines
2.4 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2013 Freescale Semiconductor, Inc. |
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*/ |
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#include <linux/bits.h> |
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#include <linux/clk-provider.h> |
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#include <linux/err.h> |
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#include <linux/io.h> |
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#include <linux/slab.h> |
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#include "clk.h" |
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/** |
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* struct clk_fixup_mux - imx integer fixup multiplexer clock |
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* @mux: the parent class |
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* @ops: pointer to clk_ops of parent class |
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* @fixup: a hook to fixup the write value |
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* |
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* The imx fixup multiplexer clock is a subclass of basic clk_mux |
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* with an addtional fixup hook. |
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*/ |
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struct clk_fixup_mux { |
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struct clk_mux mux; |
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const struct clk_ops *ops; |
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void (*fixup)(u32 *val); |
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}; |
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static inline struct clk_fixup_mux *to_clk_fixup_mux(struct clk_hw *hw) |
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{ |
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struct clk_mux *mux = to_clk_mux(hw); |
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return container_of(mux, struct clk_fixup_mux, mux); |
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} |
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static u8 clk_fixup_mux_get_parent(struct clk_hw *hw) |
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{ |
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struct clk_fixup_mux *fixup_mux = to_clk_fixup_mux(hw); |
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return fixup_mux->ops->get_parent(&fixup_mux->mux.hw); |
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} |
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static int clk_fixup_mux_set_parent(struct clk_hw *hw, u8 index) |
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{ |
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struct clk_fixup_mux *fixup_mux = to_clk_fixup_mux(hw); |
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struct clk_mux *mux = to_clk_mux(hw); |
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unsigned long flags; |
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u32 val; |
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spin_lock_irqsave(mux->lock, flags); |
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val = readl(mux->reg); |
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val &= ~(mux->mask << mux->shift); |
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val |= index << mux->shift; |
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fixup_mux->fixup(&val); |
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writel(val, mux->reg); |
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spin_unlock_irqrestore(mux->lock, flags); |
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return 0; |
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} |
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static const struct clk_ops clk_fixup_mux_ops = { |
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.get_parent = clk_fixup_mux_get_parent, |
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.set_parent = clk_fixup_mux_set_parent, |
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}; |
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struct clk_hw *imx_clk_hw_fixup_mux(const char *name, void __iomem *reg, |
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u8 shift, u8 width, const char * const *parents, |
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int num_parents, void (*fixup)(u32 *val)) |
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{ |
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struct clk_fixup_mux *fixup_mux; |
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struct clk_hw *hw; |
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struct clk_init_data init; |
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int ret; |
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if (!fixup) |
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return ERR_PTR(-EINVAL); |
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fixup_mux = kzalloc(sizeof(*fixup_mux), GFP_KERNEL); |
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if (!fixup_mux) |
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return ERR_PTR(-ENOMEM); |
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init.name = name; |
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init.ops = &clk_fixup_mux_ops; |
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init.parent_names = parents; |
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init.num_parents = num_parents; |
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init.flags = 0; |
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fixup_mux->mux.reg = reg; |
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fixup_mux->mux.shift = shift; |
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fixup_mux->mux.mask = BIT(width) - 1; |
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fixup_mux->mux.lock = &imx_ccm_lock; |
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fixup_mux->mux.hw.init = &init; |
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fixup_mux->ops = &clk_mux_ops; |
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fixup_mux->fixup = fixup; |
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hw = &fixup_mux->mux.hw; |
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ret = clk_hw_register(NULL, hw); |
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if (ret) { |
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kfree(fixup_mux); |
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return ERR_PTR(ret); |
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} |
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return hw; |
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}
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