1 /* 2 * Copyright (C) 2013 Freescale Semiconductor, Inc. 3 * 4 * The code contained herein is licensed under the GNU General Public 5 * License. You may obtain a copy of the GNU General Public License 6 * Version 2 or later at the following locations: 7 * 8 * http://www.opensource.org/licenses/gpl-license.html 9 * http://www.gnu.org/copyleft/gpl.html 10 */ 11 12 #include <linux/clk-provider.h> 13 #include <linux/err.h> 14 #include <linux/io.h> 15 #include <linux/slab.h> 16 #include "clk.h" 17 18 #define to_clk_mux(_hw) container_of(_hw, struct clk_mux, hw) 19 20 /** 21 * struct clk_fixup_mux - imx integer fixup multiplexer clock 22 * @mux: the parent class 23 * @ops: pointer to clk_ops of parent class 24 * @fixup: a hook to fixup the write value 25 * 26 * The imx fixup multiplexer clock is a subclass of basic clk_mux 27 * with an addtional fixup hook. 28 */ 29 struct clk_fixup_mux { 30 struct clk_mux mux; 31 const struct clk_ops *ops; 32 void (*fixup)(u32 *val); 33 }; 34 35 static inline struct clk_fixup_mux *to_clk_fixup_mux(struct clk_hw *hw) 36 { 37 struct clk_mux *mux = to_clk_mux(hw); 38 39 return container_of(mux, struct clk_fixup_mux, mux); 40 } 41 42 static u8 clk_fixup_mux_get_parent(struct clk_hw *hw) 43 { 44 struct clk_fixup_mux *fixup_mux = to_clk_fixup_mux(hw); 45 46 return fixup_mux->ops->get_parent(&fixup_mux->mux.hw); 47 } 48 49 static int clk_fixup_mux_set_parent(struct clk_hw *hw, u8 index) 50 { 51 struct clk_fixup_mux *fixup_mux = to_clk_fixup_mux(hw); 52 struct clk_mux *mux = to_clk_mux(hw); 53 unsigned long flags = 0; 54 u32 val; 55 56 spin_lock_irqsave(mux->lock, flags); 57 58 val = readl(mux->reg); 59 val &= ~(mux->mask << mux->shift); 60 val |= index << mux->shift; 61 fixup_mux->fixup(&val); 62 writel(val, mux->reg); 63 64 spin_unlock_irqrestore(mux->lock, flags); 65 66 return 0; 67 } 68 69 static const struct clk_ops clk_fixup_mux_ops = { 70 .get_parent = clk_fixup_mux_get_parent, 71 .set_parent = clk_fixup_mux_set_parent, 72 }; 73 74 struct clk *imx_clk_fixup_mux(const char *name, void __iomem *reg, 75 u8 shift, u8 width, const char **parents, 76 int num_parents, void (*fixup)(u32 *val)) 77 { 78 struct clk_fixup_mux *fixup_mux; 79 struct clk *clk; 80 struct clk_init_data init; 81 82 if (!fixup) 83 return ERR_PTR(-EINVAL); 84 85 fixup_mux = kzalloc(sizeof(*fixup_mux), GFP_KERNEL); 86 if (!fixup_mux) 87 return ERR_PTR(-ENOMEM); 88 89 init.name = name; 90 init.ops = &clk_fixup_mux_ops; 91 init.parent_names = parents; 92 init.num_parents = num_parents; 93 init.flags = 0; 94 95 fixup_mux->mux.reg = reg; 96 fixup_mux->mux.shift = shift; 97 fixup_mux->mux.mask = BIT(width) - 1; 98 fixup_mux->mux.lock = &imx_ccm_lock; 99 fixup_mux->mux.hw.init = &init; 100 fixup_mux->ops = &clk_mux_ops; 101 fixup_mux->fixup = fixup; 102 103 clk = clk_register(NULL, &fixup_mux->mux.hw); 104 if (IS_ERR(clk)) 105 kfree(fixup_mux); 106 107 return clk; 108 } 109