drivers/gpu/drm/omapdrm/dss/video-pll.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2014 Texas Instruments Incorporated - https://www.ti.com/
   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 "omapdss.h"
  15 #include "dss.h"
  16
  17 struct dss_video_pll {
  18         struct dss_pll pll;
  19
  20         struct device *dev;
  21
  22         void __iomem *clkctrl_base;
  23 };
  24
  25 #define REG_MOD(reg, val, start, end) \
  26         writel_relaxed(FLD_MOD(readl_relaxed(reg), val, start, end), reg)
  27
  28 static void dss_dpll_enable_scp_clk(struct dss_video_pll *vpll)
  29 {
  30         REG_MOD(vpll->clkctrl_base, 1, 14, 14); /* CIO_CLK_ICG */
  31 }
  32
  33 static void dss_dpll_disable_scp_clk(struct dss_video_pll *vpll)
  34 {
  35         REG_MOD(vpll->clkctrl_base, 0, 14, 14); /* CIO_CLK_ICG */
  36 }
  37
  38 static void dss_dpll_power_enable(struct dss_video_pll *vpll)
  39 {
  40         REG_MOD(vpll->clkctrl_base, 2, 31, 30); /* PLL_POWER_ON_ALL */
  41
  42         /*
  43          * DRA7x PLL CTRL's PLL_PWR_STATUS seems to always return 0,
  44          * so we have to use fixed delay here.
  45          */
  46         msleep(1);
  47 }
  48
  49 static void dss_dpll_power_disable(struct dss_video_pll *vpll)
  50 {
  51         REG_MOD(vpll->clkctrl_base, 0, 31, 30); /* PLL_POWER_OFF */
  52 }
  53
  54 static int dss_video_pll_enable(struct dss_pll *pll)
  55 {
  56         struct dss_video_pll *vpll = container_of(pll, struct dss_video_pll, pll);
  57         int r;
  58
  59         r = dss_runtime_get(pll->dss);
  60         if (r)
  61                 return r;
  62
  63         dss_ctrl_pll_enable(pll, true);
  64
  65         dss_dpll_enable_scp_clk(vpll);
  66
  67         r = dss_pll_wait_reset_done(pll);
  68         if (r)
  69                 goto err_reset;
  70
  71         dss_dpll_power_enable(vpll);
  72
  73         return 0;
  74
  75 err_reset:
  76         dss_dpll_disable_scp_clk(vpll);
  77         dss_ctrl_pll_enable(pll, false);
  78         dss_runtime_put(pll->dss);
  79
  80         return r;
  81 }
  82
  83 static void dss_video_pll_disable(struct dss_pll *pll)
  84 {
  85         struct dss_video_pll *vpll = container_of(pll, struct dss_video_pll, pll);
  86
  87         dss_dpll_power_disable(vpll);
  88
  89         dss_dpll_disable_scp_clk(vpll);
  90
  91         dss_ctrl_pll_enable(pll, false);
  92
  93         dss_runtime_put(pll->dss);
  94 }
  95
  96 static const struct dss_pll_ops dss_pll_ops = {
  97         .enable = dss_video_pll_enable,
  98         .disable = dss_video_pll_disable,
  99         .set_config = dss_pll_write_config_type_a,
 100 };
 101
 102 static const struct dss_pll_hw dss_dra7_video_pll_hw = {
 103         .type = DSS_PLL_TYPE_A,
 104
 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         .mX_msb[2] = 4,
 122         .mX_lsb[2] = 0,
 123         .mX_msb[3] = 9,
 124         .mX_lsb[3] = 5,
 125
 126         .has_refsel = true,
 127
 128         .errata_i886 = true,
 129         .errata_i932 = true,
 130 };
 131
 132 struct dss_pll *dss_video_pll_init(struct dss_device *dss,
 133                                    struct platform_device *pdev, int id,
 134                                    struct regulator *regulator)
 135 {
 136         const char * const reg_name[] = { "pll1", "pll2" };
 137         const char * const clkctrl_name[] = { "pll1_clkctrl", "pll2_clkctrl" };
 138         const char * const clkin_name[] = { "video1_clk", "video2_clk" };
 139
 140         struct dss_video_pll *vpll;
 141         void __iomem *pll_base, *clkctrl_base;
 142         struct clk *clk;
 143         struct dss_pll *pll;
 144         int r;
 145
 146         /* PLL CONTROL */
 147
 148         pll_base = devm_platform_ioremap_resource_byname(pdev, reg_name[id]);
 149         if (IS_ERR(pll_base))
 150                 return ERR_CAST(pll_base);
 151
 152         /* CLOCK CONTROL */
 153
 154         clkctrl_base = devm_platform_ioremap_resource_byname(pdev, clkctrl_name[id]);
 155         if (IS_ERR(clkctrl_base))
 156                 return ERR_CAST(clkctrl_base);
 157
 158         /* CLKIN */
 159
 160         clk = devm_clk_get(&pdev->dev, clkin_name[id]);
 161         if (IS_ERR(clk)) {
 162                 DSSERR("can't get video pll clkin\n");
 163                 return ERR_CAST(clk);
 164         }
 165
 166         vpll = devm_kzalloc(&pdev->dev, sizeof(*vpll), GFP_KERNEL);
 167         if (!vpll)
 168                 return ERR_PTR(-ENOMEM);
 169
 170         vpll->dev = &pdev->dev;
 171         vpll->clkctrl_base = clkctrl_base;
 172
 173         pll = &vpll->pll;
 174
 175         pll->name = id == 0 ? "video0" : "video1";
 176         pll->id = id == 0 ? DSS_PLL_VIDEO1 : DSS_PLL_VIDEO2;
 177         pll->clkin = clk;
 178         pll->regulator = regulator;
 179         pll->base = pll_base;
 180         pll->hw = &dss_dra7_video_pll_hw;
 181         pll->ops = &dss_pll_ops;
 182
 183         r = dss_pll_register(dss, pll);
 184         if (r)
 185                 return ERR_PTR(r);
 186
 187         return pll;
 188 }
 189
 190 void dss_video_pll_uninit(struct dss_pll *pll)
 191 {
 192         dss_pll_unregister(pll);
 193 }