1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2013 Freescale Semiconductor, Inc. 4 */ 5 6 #include <linux/bits.h> 7 #include <linux/clk-provider.h> 8 #include <linux/err.h> 9 #include <linux/io.h> 10 #include <linux/slab.h> 11 #include "clk.h" 12 13 /** 14 * struct clk_fixup_mux - imx integer fixup multiplexer clock 15 * @mux: the parent class 16 * @ops: pointer to clk_ops of parent class 17 * @fixup: a hook to fixup the write value 18 * 19 * The imx fixup multiplexer clock is a subclass of basic clk_mux 20 * with an addtional fixup hook. 21 */ 22 struct clk_fixup_mux { 23 struct clk_mux mux; 24 const struct clk_ops *ops; 25 void (*fixup)(u32 *val); 26 }; 27 28 static inline struct clk_fixup_mux *to_clk_fixup_mux(struct clk_hw *hw) 29 { 30 struct clk_mux *mux = to_clk_mux(hw); 31 32 return container_of(mux, struct clk_fixup_mux, mux); 33 } 34 35 static u8 clk_fixup_mux_get_parent(struct clk_hw *hw) 36 { 37 struct clk_fixup_mux *fixup_mux = to_clk_fixup_mux(hw); 38 39 return fixup_mux->ops->get_parent(&fixup_mux->mux.hw); 40 } 41 42 static int clk_fixup_mux_set_parent(struct clk_hw *hw, u8 index) 43 { 44 struct clk_fixup_mux *fixup_mux = to_clk_fixup_mux(hw); 45 struct clk_mux *mux = to_clk_mux(hw); 46 unsigned long flags; 47 u32 val; 48 49 spin_lock_irqsave(mux->lock, flags); 50 51 val = readl(mux->reg); 52 val &= ~(mux->mask << mux->shift); 53 val |= index << mux->shift; 54 fixup_mux->fixup(&val); 55 writel(val, mux->reg); 56 57 spin_unlock_irqrestore(mux->lock, flags); 58 59 return 0; 60 } 61 62 static const struct clk_ops clk_fixup_mux_ops = { 63 .determine_rate = clk_hw_determine_rate_no_reparent, 64 .get_parent = clk_fixup_mux_get_parent, 65 .set_parent = clk_fixup_mux_set_parent, 66 }; 67 68 struct clk_hw *imx_clk_hw_fixup_mux(const char *name, void __iomem *reg, 69 u8 shift, u8 width, const char * const *parents, 70 int num_parents, void (*fixup)(u32 *val)) 71 { 72 struct clk_fixup_mux *fixup_mux; 73 struct clk_hw *hw; 74 struct clk_init_data init; 75 int ret; 76 77 if (!fixup) 78 return ERR_PTR(-EINVAL); 79 80 fixup_mux = kzalloc(sizeof(*fixup_mux), GFP_KERNEL); 81 if (!fixup_mux) 82 return ERR_PTR(-ENOMEM); 83 84 init.name = name; 85 init.ops = &clk_fixup_mux_ops; 86 init.parent_names = parents; 87 init.num_parents = num_parents; 88 init.flags = 0; 89 90 fixup_mux->mux.reg = reg; 91 fixup_mux->mux.shift = shift; 92 fixup_mux->mux.mask = BIT(width) - 1; 93 fixup_mux->mux.lock = &imx_ccm_lock; 94 fixup_mux->mux.hw.init = &init; 95 fixup_mux->ops = &clk_mux_ops; 96 fixup_mux->fixup = fixup; 97 98 hw = &fixup_mux->mux.hw; 99 100 ret = clk_hw_register(NULL, hw); 101 if (ret) { 102 kfree(fixup_mux); 103 return ERR_PTR(ret); 104 } 105 106 return hw; 107 } 108