1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2017, Intel Corporation 4 */ 5 #include <linux/slab.h> 6 #include <linux/clk-provider.h> 7 #include <linux/io.h> 8 9 #include "stratix10-clk.h" 10 #include "clk.h" 11 12 #define CLK_MGR_FREE_SHIFT 16 13 #define CLK_MGR_FREE_MASK 0x7 14 #define SWCTRLBTCLKSEN_SHIFT 8 15 16 #define to_periph_clk(p) container_of(p, struct socfpga_periph_clk, hw.hw) 17 18 static unsigned long clk_peri_c_clk_recalc_rate(struct clk_hw *hwclk, 19 unsigned long parent_rate) 20 { 21 struct socfpga_periph_clk *socfpgaclk = to_periph_clk(hwclk); 22 unsigned long div = 1; 23 u32 val; 24 25 val = readl(socfpgaclk->hw.reg); 26 val &= GENMASK(SWCTRLBTCLKSEN_SHIFT - 1, 0); 27 parent_rate /= val; 28 29 return parent_rate / div; 30 } 31 32 static unsigned long clk_peri_cnt_clk_recalc_rate(struct clk_hw *hwclk, 33 unsigned long parent_rate) 34 { 35 struct socfpga_periph_clk *socfpgaclk = to_periph_clk(hwclk); 36 unsigned long div = 1; 37 38 if (socfpgaclk->fixed_div) { 39 div = socfpgaclk->fixed_div; 40 } else { 41 if (socfpgaclk->hw.reg) 42 div = ((readl(socfpgaclk->hw.reg) & 0x7ff) + 1); 43 } 44 45 return parent_rate / div; 46 } 47 48 static u8 clk_periclk_get_parent(struct clk_hw *hwclk) 49 { 50 struct socfpga_periph_clk *socfpgaclk = to_periph_clk(hwclk); 51 u32 clk_src, mask; 52 u8 parent; 53 54 if (socfpgaclk->bypass_reg) { 55 mask = (0x1 << socfpgaclk->bypass_shift); 56 parent = ((readl(socfpgaclk->bypass_reg) & mask) >> 57 socfpgaclk->bypass_shift); 58 } else { 59 clk_src = readl(socfpgaclk->hw.reg); 60 parent = (clk_src >> CLK_MGR_FREE_SHIFT) & 61 CLK_MGR_FREE_MASK; 62 } 63 return parent; 64 } 65 66 static const struct clk_ops peri_c_clk_ops = { 67 .recalc_rate = clk_peri_c_clk_recalc_rate, 68 .get_parent = clk_periclk_get_parent, 69 }; 70 71 static const struct clk_ops peri_cnt_clk_ops = { 72 .recalc_rate = clk_peri_cnt_clk_recalc_rate, 73 .get_parent = clk_periclk_get_parent, 74 }; 75 76 struct clk *s10_register_periph(const char *name, const char *parent_name, 77 const char * const *parent_names, 78 u8 num_parents, unsigned long flags, 79 void __iomem *reg, unsigned long offset) 80 { 81 struct clk *clk; 82 struct socfpga_periph_clk *periph_clk; 83 struct clk_init_data init; 84 85 periph_clk = kzalloc(sizeof(*periph_clk), GFP_KERNEL); 86 if (WARN_ON(!periph_clk)) 87 return NULL; 88 89 periph_clk->hw.reg = reg + offset; 90 91 init.name = name; 92 init.ops = &peri_c_clk_ops; 93 init.flags = flags; 94 95 init.num_parents = num_parents; 96 init.parent_names = parent_names ? parent_names : &parent_name; 97 98 periph_clk->hw.hw.init = &init; 99 100 clk = clk_register(NULL, &periph_clk->hw.hw); 101 if (WARN_ON(IS_ERR(clk))) { 102 kfree(periph_clk); 103 return NULL; 104 } 105 return clk; 106 } 107 108 struct clk *s10_register_cnt_periph(const char *name, const char *parent_name, 109 const char * const *parent_names, 110 u8 num_parents, unsigned long flags, 111 void __iomem *regbase, unsigned long offset, 112 u8 fixed_divider, unsigned long bypass_reg, 113 unsigned long bypass_shift) 114 { 115 struct clk *clk; 116 struct socfpga_periph_clk *periph_clk; 117 struct clk_init_data init; 118 119 periph_clk = kzalloc(sizeof(*periph_clk), GFP_KERNEL); 120 if (WARN_ON(!periph_clk)) 121 return NULL; 122 123 if (offset) 124 periph_clk->hw.reg = regbase + offset; 125 else 126 periph_clk->hw.reg = NULL; 127 128 if (bypass_reg) 129 periph_clk->bypass_reg = regbase + bypass_reg; 130 else 131 periph_clk->bypass_reg = NULL; 132 periph_clk->bypass_shift = bypass_shift; 133 periph_clk->fixed_div = fixed_divider; 134 135 init.name = name; 136 init.ops = &peri_cnt_clk_ops; 137 init.flags = flags; 138 139 init.num_parents = num_parents; 140 init.parent_names = parent_names ? parent_names : &parent_name; 141 142 periph_clk->hw.hw.init = &init; 143 144 clk = clk_register(NULL, &periph_clk->hw.hw); 145 if (WARN_ON(IS_ERR(clk))) { 146 kfree(periph_clk); 147 return NULL; 148 } 149 return clk; 150 } 151