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