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/bits.h> 8 #include <linux/clk.h> 9 #include <linux/clk-provider.h> 10 #include <linux/io.h> 11 #include <linux/slab.h> 12 #include <linux/jiffies.h> 13 #include <linux/err.h> 14 #include "clk.h" 15 16 static int clk_busy_wait(void __iomem *reg, u8 shift) 17 { 18 unsigned long timeout = jiffies + msecs_to_jiffies(10); 19 20 while (readl_relaxed(reg) & (1 << shift)) 21 if (time_after(jiffies, timeout)) 22 return -ETIMEDOUT; 23 24 return 0; 25 } 26 27 struct clk_busy_divider { 28 struct clk_divider div; 29 const struct clk_ops *div_ops; 30 void __iomem *reg; 31 u8 shift; 32 }; 33 34 static inline struct clk_busy_divider *to_clk_busy_divider(struct clk_hw *hw) 35 { 36 struct clk_divider *div = to_clk_divider(hw); 37 38 return container_of(div, struct clk_busy_divider, div); 39 } 40 41 static unsigned long clk_busy_divider_recalc_rate(struct clk_hw *hw, 42 unsigned long parent_rate) 43 { 44 struct clk_busy_divider *busy = to_clk_busy_divider(hw); 45 46 return busy->div_ops->recalc_rate(&busy->div.hw, parent_rate); 47 } 48 49 static long clk_busy_divider_round_rate(struct clk_hw *hw, unsigned long rate, 50 unsigned long *prate) 51 { 52 struct clk_busy_divider *busy = to_clk_busy_divider(hw); 53 54 return busy->div_ops->round_rate(&busy->div.hw, rate, prate); 55 } 56 57 static int clk_busy_divider_set_rate(struct clk_hw *hw, unsigned long rate, 58 unsigned long parent_rate) 59 { 60 struct clk_busy_divider *busy = to_clk_busy_divider(hw); 61 int ret; 62 63 ret = busy->div_ops->set_rate(&busy->div.hw, rate, parent_rate); 64 if (!ret) 65 ret = clk_busy_wait(busy->reg, busy->shift); 66 67 return ret; 68 } 69 70 static const struct clk_ops clk_busy_divider_ops = { 71 .recalc_rate = clk_busy_divider_recalc_rate, 72 .round_rate = clk_busy_divider_round_rate, 73 .set_rate = clk_busy_divider_set_rate, 74 }; 75 76 struct clk_hw *imx_clk_hw_busy_divider(const char *name, const char *parent_name, 77 void __iomem *reg, u8 shift, u8 width, 78 void __iomem *busy_reg, u8 busy_shift) 79 { 80 struct clk_busy_divider *busy; 81 struct clk_hw *hw; 82 struct clk_init_data init; 83 int ret; 84 85 busy = kzalloc(sizeof(*busy), GFP_KERNEL); 86 if (!busy) 87 return ERR_PTR(-ENOMEM); 88 89 busy->reg = busy_reg; 90 busy->shift = busy_shift; 91 92 busy->div.reg = reg; 93 busy->div.shift = shift; 94 busy->div.width = width; 95 busy->div.lock = &imx_ccm_lock; 96 busy->div_ops = &clk_divider_ops; 97 98 init.name = name; 99 init.ops = &clk_busy_divider_ops; 100 init.flags = CLK_SET_RATE_PARENT | CLK_IS_CRITICAL; 101 init.parent_names = &parent_name; 102 init.num_parents = 1; 103 104 busy->div.hw.init = &init; 105 106 hw = &busy->div.hw; 107 108 ret = clk_hw_register(NULL, hw); 109 if (ret) { 110 kfree(busy); 111 return ERR_PTR(ret); 112 } 113 114 return hw; 115 } 116 117 struct clk_busy_mux { 118 struct clk_mux mux; 119 const struct clk_ops *mux_ops; 120 void __iomem *reg; 121 u8 shift; 122 }; 123 124 static inline struct clk_busy_mux *to_clk_busy_mux(struct clk_hw *hw) 125 { 126 struct clk_mux *mux = to_clk_mux(hw); 127 128 return container_of(mux, struct clk_busy_mux, mux); 129 } 130 131 static u8 clk_busy_mux_get_parent(struct clk_hw *hw) 132 { 133 struct clk_busy_mux *busy = to_clk_busy_mux(hw); 134 135 return busy->mux_ops->get_parent(&busy->mux.hw); 136 } 137 138 static int clk_busy_mux_set_parent(struct clk_hw *hw, u8 index) 139 { 140 struct clk_busy_mux *busy = to_clk_busy_mux(hw); 141 int ret; 142 143 ret = busy->mux_ops->set_parent(&busy->mux.hw, index); 144 if (!ret) 145 ret = clk_busy_wait(busy->reg, busy->shift); 146 147 return ret; 148 } 149 150 static const struct clk_ops clk_busy_mux_ops = { 151 .determine_rate = clk_hw_determine_rate_no_reparent, 152 .get_parent = clk_busy_mux_get_parent, 153 .set_parent = clk_busy_mux_set_parent, 154 }; 155 156 struct clk_hw *imx_clk_hw_busy_mux(const char *name, void __iomem *reg, u8 shift, 157 u8 width, void __iomem *busy_reg, u8 busy_shift, 158 const char * const *parent_names, int num_parents) 159 { 160 struct clk_busy_mux *busy; 161 struct clk_hw *hw; 162 struct clk_init_data init; 163 int ret; 164 165 busy = kzalloc(sizeof(*busy), GFP_KERNEL); 166 if (!busy) 167 return ERR_PTR(-ENOMEM); 168 169 busy->reg = busy_reg; 170 busy->shift = busy_shift; 171 172 busy->mux.reg = reg; 173 busy->mux.shift = shift; 174 busy->mux.mask = BIT(width) - 1; 175 busy->mux.lock = &imx_ccm_lock; 176 busy->mux_ops = &clk_mux_ops; 177 178 init.name = name; 179 init.ops = &clk_busy_mux_ops; 180 init.flags = CLK_IS_CRITICAL; 181 init.parent_names = parent_names; 182 init.num_parents = num_parents; 183 184 busy->mux.hw.init = &init; 185 186 hw = &busy->mux.hw; 187 188 ret = clk_hw_register(NULL, hw); 189 if (ret) { 190 kfree(busy); 191 return ERR_PTR(ret); 192 } 193 194 return hw; 195 } 196