1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2014 Texas Instruments Ltd 4 */ 5 6 #include <linux/clk.h> 7 #include <linux/delay.h> 8 #include <linux/err.h> 9 #include <linux/io.h> 10 #include <linux/kernel.h> 11 #include <linux/platform_device.h> 12 #include <linux/sched.h> 13 14 #include <video/omapfb_dss.h> 15 16 #include "dss.h" 17 #include "dss_features.h" 18 19 struct dss_video_pll { 20 struct dss_pll pll; 21 22 struct device *dev; 23 24 void __iomem *clkctrl_base; 25 }; 26 27 #define REG_MOD(reg, val, start, end) \ 28 writel_relaxed(FLD_MOD(readl_relaxed(reg), val, start, end), reg) 29 30 static void dss_dpll_enable_scp_clk(struct dss_video_pll *vpll) 31 { 32 REG_MOD(vpll->clkctrl_base, 1, 14, 14); /* CIO_CLK_ICG */ 33 } 34 35 static void dss_dpll_disable_scp_clk(struct dss_video_pll *vpll) 36 { 37 REG_MOD(vpll->clkctrl_base, 0, 14, 14); /* CIO_CLK_ICG */ 38 } 39 40 static void dss_dpll_power_enable(struct dss_video_pll *vpll) 41 { 42 REG_MOD(vpll->clkctrl_base, 2, 31, 30); /* PLL_POWER_ON_ALL */ 43 44 /* 45 * DRA7x PLL CTRL's PLL_PWR_STATUS seems to always return 0, 46 * so we have to use fixed delay here. 47 */ 48 msleep(1); 49 } 50 51 static void dss_dpll_power_disable(struct dss_video_pll *vpll) 52 { 53 REG_MOD(vpll->clkctrl_base, 0, 31, 30); /* PLL_POWER_OFF */ 54 } 55 56 static int dss_video_pll_enable(struct dss_pll *pll) 57 { 58 struct dss_video_pll *vpll = container_of(pll, struct dss_video_pll, pll); 59 int r; 60 61 r = dss_runtime_get(); 62 if (r) 63 return r; 64 65 dss_ctrl_pll_enable(pll->id, true); 66 67 dss_dpll_enable_scp_clk(vpll); 68 69 r = dss_pll_wait_reset_done(pll); 70 if (r) 71 goto err_reset; 72 73 dss_dpll_power_enable(vpll); 74 75 return 0; 76 77 err_reset: 78 dss_dpll_disable_scp_clk(vpll); 79 dss_ctrl_pll_enable(pll->id, false); 80 dss_runtime_put(); 81 82 return r; 83 } 84 85 static void dss_video_pll_disable(struct dss_pll *pll) 86 { 87 struct dss_video_pll *vpll = container_of(pll, struct dss_video_pll, pll); 88 89 dss_dpll_power_disable(vpll); 90 91 dss_dpll_disable_scp_clk(vpll); 92 93 dss_ctrl_pll_enable(pll->id, false); 94 95 dss_runtime_put(); 96 } 97 98 static const struct dss_pll_ops dss_pll_ops = { 99 .enable = dss_video_pll_enable, 100 .disable = dss_video_pll_disable, 101 .set_config = dss_pll_write_config_type_a, 102 }; 103 104 static const struct dss_pll_hw dss_dra7_video_pll_hw = { 105 .n_max = (1 << 8) - 1, 106 .m_max = (1 << 12) - 1, 107 .mX_max = (1 << 5) - 1, 108 .fint_min = 500000, 109 .fint_max = 2500000, 110 .clkdco_max = 1800000000, 111 112 .n_msb = 8, 113 .n_lsb = 1, 114 .m_msb = 20, 115 .m_lsb = 9, 116 117 .mX_msb[0] = 25, 118 .mX_lsb[0] = 21, 119 .mX_msb[1] = 30, 120 .mX_lsb[1] = 26, 121 122 .has_refsel = true, 123 }; 124 125 struct dss_pll *dss_video_pll_init(struct platform_device *pdev, int id, 126 struct regulator *regulator) 127 { 128 const char * const reg_name[] = { "pll1", "pll2" }; 129 const char * const clkctrl_name[] = { "pll1_clkctrl", "pll2_clkctrl" }; 130 const char * const clkin_name[] = { "video1_clk", "video2_clk" }; 131 132 struct dss_video_pll *vpll; 133 void __iomem *pll_base, *clkctrl_base; 134 struct clk *clk; 135 struct dss_pll *pll; 136 int r; 137 138 /* PLL CONTROL */ 139 140 pll_base = devm_platform_ioremap_resource_byname(pdev, reg_name[id]); 141 if (IS_ERR(pll_base)) { 142 dev_err(&pdev->dev, "failed to ioremap pll%d reg_name\n", id); 143 return ERR_CAST(pll_base); 144 } 145 146 /* CLOCK CONTROL */ 147 148 clkctrl_base = devm_platform_ioremap_resource_byname(pdev, clkctrl_name[id]); 149 if (IS_ERR(clkctrl_base)) { 150 dev_err(&pdev->dev, "failed to ioremap pll%d clkctrl\n", id); 151 return ERR_CAST(clkctrl_base); 152 } 153 154 /* CLKIN */ 155 156 clk = devm_clk_get(&pdev->dev, clkin_name[id]); 157 if (IS_ERR(clk)) { 158 DSSERR("can't get video pll clkin\n"); 159 return ERR_CAST(clk); 160 } 161 162 vpll = devm_kzalloc(&pdev->dev, sizeof(*vpll), GFP_KERNEL); 163 if (!vpll) 164 return ERR_PTR(-ENOMEM); 165 166 vpll->dev = &pdev->dev; 167 vpll->clkctrl_base = clkctrl_base; 168 169 pll = &vpll->pll; 170 171 pll->name = id == 0 ? "video0" : "video1"; 172 pll->id = id == 0 ? DSS_PLL_VIDEO1 : DSS_PLL_VIDEO2; 173 pll->clkin = clk; 174 pll->regulator = regulator; 175 pll->base = pll_base; 176 pll->hw = &dss_dra7_video_pll_hw; 177 pll->ops = &dss_pll_ops; 178 179 r = dss_pll_register(pll); 180 if (r) 181 return ERR_PTR(r); 182 183 return pll; 184 } 185 186 void dss_video_pll_uninit(struct dss_pll *pll) 187 { 188 dss_pll_unregister(pll); 189 } 190