1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2014 Red Hat 4 * Author: Rob Clark <robdclark@gmail.com> 5 */ 6 7 #include <linux/clk.h> 8 #include <linux/clk-provider.h> 9 10 #include "mdp4_kms.h" 11 12 struct mdp4_lvds_pll { 13 struct clk_hw pll_hw; 14 struct drm_device *dev; 15 unsigned long pixclk; 16 }; 17 #define to_mdp4_lvds_pll(x) container_of(x, struct mdp4_lvds_pll, pll_hw) 18 19 static struct mdp4_kms *get_kms(struct mdp4_lvds_pll *lvds_pll) 20 { 21 struct msm_drm_private *priv = lvds_pll->dev->dev_private; 22 return to_mdp4_kms(to_mdp_kms(priv->kms)); 23 } 24 25 struct pll_rate { 26 unsigned long rate; 27 struct { 28 uint32_t val; 29 uint32_t reg; 30 } conf[32]; 31 }; 32 33 /* NOTE: keep sorted highest freq to lowest: */ 34 static const struct pll_rate freqtbl[] = { 35 { 72000000, { 36 { 0x8f, REG_MDP4_LVDS_PHY_PLL_CTRL_1 }, 37 { 0x30, REG_MDP4_LVDS_PHY_PLL_CTRL_2 }, 38 { 0xc6, REG_MDP4_LVDS_PHY_PLL_CTRL_3 }, 39 { 0x10, REG_MDP4_LVDS_PHY_PLL_CTRL_5 }, 40 { 0x07, REG_MDP4_LVDS_PHY_PLL_CTRL_6 }, 41 { 0x62, REG_MDP4_LVDS_PHY_PLL_CTRL_7 }, 42 { 0x41, REG_MDP4_LVDS_PHY_PLL_CTRL_8 }, 43 { 0x0d, REG_MDP4_LVDS_PHY_PLL_CTRL_9 }, 44 { 0, 0 } } 45 }, 46 }; 47 48 static const struct pll_rate *find_rate(unsigned long rate) 49 { 50 int i; 51 for (i = 1; i < ARRAY_SIZE(freqtbl); i++) 52 if (rate > freqtbl[i].rate) 53 return &freqtbl[i-1]; 54 return &freqtbl[i-1]; 55 } 56 57 static int mpd4_lvds_pll_enable(struct clk_hw *hw) 58 { 59 struct mdp4_lvds_pll *lvds_pll = to_mdp4_lvds_pll(hw); 60 struct mdp4_kms *mdp4_kms = get_kms(lvds_pll); 61 const struct pll_rate *pll_rate = find_rate(lvds_pll->pixclk); 62 int i; 63 64 DBG("pixclk=%lu (%lu)", lvds_pll->pixclk, pll_rate->rate); 65 66 if (WARN_ON(!pll_rate)) 67 return -EINVAL; 68 69 mdp4_write(mdp4_kms, REG_MDP4_LCDC_LVDS_PHY_RESET, 0x33); 70 71 for (i = 0; pll_rate->conf[i].reg; i++) 72 mdp4_write(mdp4_kms, pll_rate->conf[i].reg, pll_rate->conf[i].val); 73 74 mdp4_write(mdp4_kms, REG_MDP4_LVDS_PHY_PLL_CTRL_0, 0x01); 75 76 /* Wait until LVDS PLL is locked and ready */ 77 while (!mdp4_read(mdp4_kms, REG_MDP4_LVDS_PHY_PLL_LOCKED)) 78 cpu_relax(); 79 80 return 0; 81 } 82 83 static void mpd4_lvds_pll_disable(struct clk_hw *hw) 84 { 85 struct mdp4_lvds_pll *lvds_pll = to_mdp4_lvds_pll(hw); 86 struct mdp4_kms *mdp4_kms = get_kms(lvds_pll); 87 88 DBG(""); 89 90 mdp4_write(mdp4_kms, REG_MDP4_LVDS_PHY_CFG0, 0x0); 91 mdp4_write(mdp4_kms, REG_MDP4_LVDS_PHY_PLL_CTRL_0, 0x0); 92 } 93 94 static unsigned long mpd4_lvds_pll_recalc_rate(struct clk_hw *hw, 95 unsigned long parent_rate) 96 { 97 struct mdp4_lvds_pll *lvds_pll = to_mdp4_lvds_pll(hw); 98 return lvds_pll->pixclk; 99 } 100 101 static long mpd4_lvds_pll_round_rate(struct clk_hw *hw, unsigned long rate, 102 unsigned long *parent_rate) 103 { 104 const struct pll_rate *pll_rate = find_rate(rate); 105 return pll_rate->rate; 106 } 107 108 static int mpd4_lvds_pll_set_rate(struct clk_hw *hw, unsigned long rate, 109 unsigned long parent_rate) 110 { 111 struct mdp4_lvds_pll *lvds_pll = to_mdp4_lvds_pll(hw); 112 lvds_pll->pixclk = rate; 113 return 0; 114 } 115 116 117 static const struct clk_ops mpd4_lvds_pll_ops = { 118 .enable = mpd4_lvds_pll_enable, 119 .disable = mpd4_lvds_pll_disable, 120 .recalc_rate = mpd4_lvds_pll_recalc_rate, 121 .round_rate = mpd4_lvds_pll_round_rate, 122 .set_rate = mpd4_lvds_pll_set_rate, 123 }; 124 125 static const char *mpd4_lvds_pll_parents[] = { 126 "pxo", 127 }; 128 129 static struct clk_init_data pll_init = { 130 .name = "mpd4_lvds_pll", 131 .ops = &mpd4_lvds_pll_ops, 132 .parent_names = mpd4_lvds_pll_parents, 133 .num_parents = ARRAY_SIZE(mpd4_lvds_pll_parents), 134 }; 135 136 struct clk *mpd4_lvds_pll_init(struct drm_device *dev) 137 { 138 struct mdp4_lvds_pll *lvds_pll; 139 struct clk *clk; 140 int ret; 141 142 lvds_pll = devm_kzalloc(dev->dev, sizeof(*lvds_pll), GFP_KERNEL); 143 if (!lvds_pll) { 144 ret = -ENOMEM; 145 goto fail; 146 } 147 148 lvds_pll->dev = dev; 149 150 lvds_pll->pll_hw.init = &pll_init; 151 clk = devm_clk_register(dev->dev, &lvds_pll->pll_hw); 152 if (IS_ERR(clk)) { 153 ret = PTR_ERR(clk); 154 goto fail; 155 } 156 157 return clk; 158 159 fail: 160 return ERR_PTR(ret); 161 } 162