1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright 2012 Freescale Semiconductor, Inc. 4 * Copyright 2012 Linaro Ltd. 5 */ 6 7 #include <linux/clk.h> 8 #include <linux/clk-provider.h> 9 #include <linux/io.h> 10 #include <linux/slab.h> 11 #include <linux/jiffies.h> 12 #include <linux/err.h> 13 #include "clk.h" 14 15 static int clk_busy_wait(void __iomem *reg, u8 shift) 16 { 17 unsigned long timeout = jiffies + msecs_to_jiffies(10); 18 19 while (readl_relaxed(reg) & (1 << shift)) 20 if (time_after(jiffies, timeout)) 21 return -ETIMEDOUT; 22 23 return 0; 24 } 25 26 struct clk_busy_divider { 27 struct clk_divider div; 28 const struct clk_ops *div_ops; 29 void __iomem *reg; 30 u8 shift; 31 }; 32 33 static inline struct clk_busy_divider *to_clk_busy_divider(struct clk_hw *hw) 34 { 35 struct clk_divider *div = to_clk_divider(hw); 36 37 return container_of(div, struct clk_busy_divider, div); 38 } 39 40 static unsigned long clk_busy_divider_recalc_rate(struct clk_hw *hw, 41 unsigned long parent_rate) 42 { 43 struct clk_busy_divider *busy = to_clk_busy_divider(hw); 44 45 return busy->div_ops->recalc_rate(&busy->div.hw, parent_rate); 46 } 47 48 static long clk_busy_divider_round_rate(struct clk_hw *hw, unsigned long rate, 49 unsigned long *prate) 50 { 51 struct clk_busy_divider *busy = to_clk_busy_divider(hw); 52 53 return busy->div_ops->round_rate(&busy->div.hw, rate, prate); 54 } 55 56 static int clk_busy_divider_set_rate(struct clk_hw *hw, unsigned long rate, 57 unsigned long parent_rate) 58 { 59 struct clk_busy_divider *busy = to_clk_busy_divider(hw); 60 int ret; 61 62 ret = busy->div_ops->set_rate(&busy->div.hw, rate, parent_rate); 63 if (!ret) 64 ret = clk_busy_wait(busy->reg, busy->shift); 65 66 return ret; 67 } 68 69 static const struct clk_ops clk_busy_divider_ops = { 70 .recalc_rate = clk_busy_divider_recalc_rate, 71 .round_rate = clk_busy_divider_round_rate, 72 .set_rate = clk_busy_divider_set_rate, 73 }; 74 75 struct clk_hw *imx_clk_hw_busy_divider(const char *name, const char *parent_name, 76 void __iomem *reg, u8 shift, u8 width, 77 void __iomem *busy_reg, u8 busy_shift) 78 { 79 struct clk_busy_divider *busy; 80 struct clk_hw *hw; 81 struct clk_init_data init; 82 int ret; 83 84 busy = kzalloc(sizeof(*busy), GFP_KERNEL); 85 if (!busy) 86 return ERR_PTR(-ENOMEM); 87 88 busy->reg = busy_reg; 89 busy->shift = busy_shift; 90 91 busy->div.reg = reg; 92 busy->div.shift = shift; 93 busy->div.width = width; 94 busy->div.lock = &imx_ccm_lock; 95 busy->div_ops = &clk_divider_ops; 96 97 init.name = name; 98 init.ops = &clk_busy_divider_ops; 99 init.flags = CLK_SET_RATE_PARENT | CLK_IS_CRITICAL; 100 init.parent_names = &parent_name; 101 init.num_parents = 1; 102 103 busy->div.hw.init = &init; 104 105 hw = &busy->div.hw; 106 107 ret = clk_hw_register(NULL, hw); 108 if (ret) { 109 kfree(busy); 110 return ERR_PTR(ret); 111 } 112 113 return hw; 114 } 115 116 struct clk_busy_mux { 117 struct clk_mux mux; 118 const struct clk_ops *mux_ops; 119 void __iomem *reg; 120 u8 shift; 121 }; 122 123 static inline struct clk_busy_mux *to_clk_busy_mux(struct clk_hw *hw) 124 { 125 struct clk_mux *mux = to_clk_mux(hw); 126 127 return container_of(mux, struct clk_busy_mux, mux); 128 } 129 130 static u8 clk_busy_mux_get_parent(struct clk_hw *hw) 131 { 132 struct clk_busy_mux *busy = to_clk_busy_mux(hw); 133 134 return busy->mux_ops->get_parent(&busy->mux.hw); 135 } 136 137 static int clk_busy_mux_set_parent(struct clk_hw *hw, u8 index) 138 { 139 struct clk_busy_mux *busy = to_clk_busy_mux(hw); 140 int ret; 141 142 ret = busy->mux_ops->set_parent(&busy->mux.hw, index); 143 if (!ret) 144 ret = clk_busy_wait(busy->reg, busy->shift); 145 146 return ret; 147 } 148 149 static const struct clk_ops clk_busy_mux_ops = { 150 .get_parent = clk_busy_mux_get_parent, 151 .set_parent = clk_busy_mux_set_parent, 152 }; 153 154 struct clk_hw *imx_clk_hw_busy_mux(const char *name, void __iomem *reg, u8 shift, 155 u8 width, void __iomem *busy_reg, u8 busy_shift, 156 const char * const *parent_names, int num_parents) 157 { 158 struct clk_busy_mux *busy; 159 struct clk_hw *hw; 160 struct clk_init_data init; 161 int ret; 162 163 busy = kzalloc(sizeof(*busy), GFP_KERNEL); 164 if (!busy) 165 return ERR_PTR(-ENOMEM); 166 167 busy->reg = busy_reg; 168 busy->shift = busy_shift; 169 170 busy->mux.reg = reg; 171 busy->mux.shift = shift; 172 busy->mux.mask = BIT(width) - 1; 173 busy->mux.lock = &imx_ccm_lock; 174 busy->mux_ops = &clk_mux_ops; 175 176 init.name = name; 177 init.ops = &clk_busy_mux_ops; 178 init.flags = CLK_IS_CRITICAL; 179 init.parent_names = parent_names; 180 init.num_parents = num_parents; 181 182 busy->mux.hw.init = &init; 183 184 hw = &busy->mux.hw; 185 186 ret = clk_hw_register(NULL, hw); 187 if (ret) { 188 kfree(busy); 189 return ERR_PTR(ret); 190 } 191 192 return hw; 193 } 194