1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2020 Intel Corporation. 4 * Zhu YiXin <yixin.zhu@intel.com> 5 * Rahul Tanwar <rahul.tanwar@intel.com> 6 */ 7 8 #include <linux/clk-provider.h> 9 #include <linux/delay.h> 10 #include <linux/device.h> 11 #include <linux/iopoll.h> 12 #include <linux/of.h> 13 14 #include "clk-cgu.h" 15 16 #define to_lgm_clk_pll(_hw) container_of(_hw, struct lgm_clk_pll, hw) 17 #define PLL_REF_DIV(x) ((x) + 0x08) 18 19 /* 20 * Calculate formula: 21 * rate = (prate * mult + (prate * frac) / frac_div) / div 22 */ 23 static unsigned long 24 lgm_pll_calc_rate(unsigned long prate, unsigned int mult, 25 unsigned int div, unsigned int frac, unsigned int frac_div) 26 { 27 u64 crate, frate, rate64; 28 29 rate64 = prate; 30 crate = rate64 * mult; 31 frate = rate64 * frac; 32 do_div(frate, frac_div); 33 crate += frate; 34 do_div(crate, div); 35 36 return crate; 37 } 38 39 static unsigned long lgm_pll_recalc_rate(struct clk_hw *hw, unsigned long prate) 40 { 41 struct lgm_clk_pll *pll = to_lgm_clk_pll(hw); 42 unsigned int div, mult, frac; 43 unsigned long flags; 44 45 spin_lock_irqsave(&pll->lock, flags); 46 mult = lgm_get_clk_val(pll->membase, PLL_REF_DIV(pll->reg), 0, 12); 47 div = lgm_get_clk_val(pll->membase, PLL_REF_DIV(pll->reg), 18, 6); 48 frac = lgm_get_clk_val(pll->membase, pll->reg, 2, 24); 49 spin_unlock_irqrestore(&pll->lock, flags); 50 51 if (pll->type == TYPE_LJPLL) 52 div *= 4; 53 54 return lgm_pll_calc_rate(prate, mult, div, frac, BIT(24)); 55 } 56 57 static int lgm_pll_is_enabled(struct clk_hw *hw) 58 { 59 struct lgm_clk_pll *pll = to_lgm_clk_pll(hw); 60 unsigned long flags; 61 unsigned int ret; 62 63 spin_lock_irqsave(&pll->lock, flags); 64 ret = lgm_get_clk_val(pll->membase, pll->reg, 0, 1); 65 spin_unlock_irqrestore(&pll->lock, flags); 66 67 return ret; 68 } 69 70 static int lgm_pll_enable(struct clk_hw *hw) 71 { 72 struct lgm_clk_pll *pll = to_lgm_clk_pll(hw); 73 unsigned long flags; 74 u32 val; 75 int ret; 76 77 spin_lock_irqsave(&pll->lock, flags); 78 lgm_set_clk_val(pll->membase, pll->reg, 0, 1, 1); 79 ret = readl_poll_timeout_atomic(pll->membase + pll->reg, 80 val, (val & 0x1), 1, 100); 81 spin_unlock_irqrestore(&pll->lock, flags); 82 83 return ret; 84 } 85 86 static void lgm_pll_disable(struct clk_hw *hw) 87 { 88 struct lgm_clk_pll *pll = to_lgm_clk_pll(hw); 89 unsigned long flags; 90 91 spin_lock_irqsave(&pll->lock, flags); 92 lgm_set_clk_val(pll->membase, pll->reg, 0, 1, 0); 93 spin_unlock_irqrestore(&pll->lock, flags); 94 } 95 96 static const struct clk_ops lgm_pll_ops = { 97 .recalc_rate = lgm_pll_recalc_rate, 98 .is_enabled = lgm_pll_is_enabled, 99 .enable = lgm_pll_enable, 100 .disable = lgm_pll_disable, 101 }; 102 103 static struct clk_hw * 104 lgm_clk_register_pll(struct lgm_clk_provider *ctx, 105 const struct lgm_pll_clk_data *list) 106 { 107 struct clk_init_data init = {}; 108 struct lgm_clk_pll *pll; 109 struct device *dev = ctx->dev; 110 struct clk_hw *hw; 111 int ret; 112 113 init.ops = &lgm_pll_ops; 114 init.name = list->name; 115 init.flags = list->flags; 116 init.parent_data = list->parent_data; 117 init.num_parents = list->num_parents; 118 119 pll = devm_kzalloc(dev, sizeof(*pll), GFP_KERNEL); 120 if (!pll) 121 return ERR_PTR(-ENOMEM); 122 123 pll->membase = ctx->membase; 124 pll->lock = ctx->lock; 125 pll->reg = list->reg; 126 pll->flags = list->flags; 127 pll->type = list->type; 128 pll->hw.init = &init; 129 130 hw = &pll->hw; 131 ret = clk_hw_register(dev, hw); 132 if (ret) 133 return ERR_PTR(ret); 134 135 return hw; 136 } 137 138 int lgm_clk_register_plls(struct lgm_clk_provider *ctx, 139 const struct lgm_pll_clk_data *list, 140 unsigned int nr_clk) 141 { 142 struct clk_hw *hw; 143 int i; 144 145 for (i = 0; i < nr_clk; i++, list++) { 146 hw = lgm_clk_register_pll(ctx, list); 147 if (IS_ERR(hw)) { 148 dev_err(ctx->dev, "failed to register pll: %s\n", 149 list->name); 150 return PTR_ERR(hw); 151 } 152 ctx->clk_data.hws[list->id] = hw; 153 } 154 155 return 0; 156 } 157