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127 lines
3.0 KiB
127 lines
3.0 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/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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#define div_mask(d) ((1 << (d->width)) - 1) |
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/** |
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* struct clk_fixup_div - imx integer fixup divider clock |
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* @divider: 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 divider clock is a subclass of basic clk_divider |
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* with an addtional fixup hook. |
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*/ |
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struct clk_fixup_div { |
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struct clk_divider divider; |
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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_div *to_clk_fixup_div(struct clk_hw *hw) |
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{ |
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struct clk_divider *divider = to_clk_divider(hw); |
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return container_of(divider, struct clk_fixup_div, divider); |
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} |
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static unsigned long clk_fixup_div_recalc_rate(struct clk_hw *hw, |
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unsigned long parent_rate) |
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{ |
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struct clk_fixup_div *fixup_div = to_clk_fixup_div(hw); |
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return fixup_div->ops->recalc_rate(&fixup_div->divider.hw, parent_rate); |
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} |
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static long clk_fixup_div_round_rate(struct clk_hw *hw, unsigned long rate, |
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unsigned long *prate) |
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{ |
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struct clk_fixup_div *fixup_div = to_clk_fixup_div(hw); |
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return fixup_div->ops->round_rate(&fixup_div->divider.hw, rate, prate); |
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} |
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static int clk_fixup_div_set_rate(struct clk_hw *hw, unsigned long rate, |
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unsigned long parent_rate) |
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{ |
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struct clk_fixup_div *fixup_div = to_clk_fixup_div(hw); |
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struct clk_divider *div = to_clk_divider(hw); |
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unsigned int divider, value; |
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unsigned long flags; |
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u32 val; |
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divider = parent_rate / rate; |
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/* Zero based divider */ |
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value = divider - 1; |
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if (value > div_mask(div)) |
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value = div_mask(div); |
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spin_lock_irqsave(div->lock, flags); |
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val = readl(div->reg); |
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val &= ~(div_mask(div) << div->shift); |
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val |= value << div->shift; |
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fixup_div->fixup(&val); |
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writel(val, div->reg); |
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spin_unlock_irqrestore(div->lock, flags); |
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return 0; |
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} |
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static const struct clk_ops clk_fixup_div_ops = { |
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.recalc_rate = clk_fixup_div_recalc_rate, |
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.round_rate = clk_fixup_div_round_rate, |
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.set_rate = clk_fixup_div_set_rate, |
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}; |
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struct clk_hw *imx_clk_hw_fixup_divider(const char *name, const char *parent, |
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void __iomem *reg, u8 shift, u8 width, |
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void (*fixup)(u32 *val)) |
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{ |
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struct clk_fixup_div *fixup_div; |
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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_div = kzalloc(sizeof(*fixup_div), GFP_KERNEL); |
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if (!fixup_div) |
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return ERR_PTR(-ENOMEM); |
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init.name = name; |
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init.ops = &clk_fixup_div_ops; |
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init.flags = CLK_SET_RATE_PARENT; |
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init.parent_names = parent ? &parent : NULL; |
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init.num_parents = parent ? 1 : 0; |
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fixup_div->divider.reg = reg; |
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fixup_div->divider.shift = shift; |
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fixup_div->divider.width = width; |
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fixup_div->divider.lock = &imx_ccm_lock; |
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fixup_div->divider.hw.init = &init; |
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fixup_div->ops = &clk_divider_ops; |
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fixup_div->fixup = fixup; |
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hw = &fixup_div->divider.hw; |
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ret = clk_hw_register(NULL, hw); |
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if (ret) { |
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kfree(fixup_div); |
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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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