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 struct stratix10_perip_c_clock *clks, 77 void __iomem *reg) 78 { 79 struct clk *clk; 80 struct socfpga_periph_clk *periph_clk; 81 struct clk_init_data init; 82 const char *name = clks->name; 83 const char *parent_name = clks->parent_name; 84 const char * const *parent_names = clks->parent_names; 85 86 periph_clk = kzalloc(sizeof(*periph_clk), GFP_KERNEL); 87 if (WARN_ON(!periph_clk)) 88 return NULL; 89 90 periph_clk->hw.reg = reg + clks->offset; 91 92 init.name = name; 93 init.ops = &peri_c_clk_ops; 94 init.flags = clks->flags; 95 96 init.num_parents = clks->num_parents; 97 init.parent_names = parent_names ? parent_names : &parent_name; 98 99 periph_clk->hw.hw.init = &init; 100 101 clk = clk_register(NULL, &periph_clk->hw.hw); 102 if (WARN_ON(IS_ERR(clk))) { 103 kfree(periph_clk); 104 return NULL; 105 } 106 return clk; 107 } 108 109 struct clk *s10_register_cnt_periph(const struct stratix10_perip_cnt_clock *clks, 110 void __iomem *regbase) 111 { 112 struct clk *clk; 113 struct socfpga_periph_clk *periph_clk; 114 struct clk_init_data init; 115 const char *name = clks->name; 116 const char *parent_name = clks->parent_name; 117 const char * const *parent_names = clks->parent_names; 118 119 periph_clk = kzalloc(sizeof(*periph_clk), GFP_KERNEL); 120 if (WARN_ON(!periph_clk)) 121 return NULL; 122 123 if (clks->offset) 124 periph_clk->hw.reg = regbase + clks->offset; 125 else 126 periph_clk->hw.reg = NULL; 127 128 if (clks->bypass_reg) 129 periph_clk->bypass_reg = regbase + clks->bypass_reg; 130 else 131 periph_clk->bypass_reg = NULL; 132 periph_clk->bypass_shift = clks->bypass_shift; 133 periph_clk->fixed_div = clks->fixed_divider; 134 135 init.name = name; 136 init.ops = &peri_cnt_clk_ops; 137 init.flags = clks->flags; 138 139 init.num_parents = clks->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