drivers/gpu/drm/omapdrm/dss/hdmi_pll.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * HDMI PLL
   4  *
   5  * Copyright (C) 2013 Texas Instruments Incorporated - https://www.ti.com/
   6  */
   7
   8 #define DSS_SUBSYS_NAME "HDMIPLL"
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/err.h>
  13 #include <linux/io.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/clk.h>
  16 #include <linux/seq_file.h>
  17 #include <linux/pm_runtime.h>
  18
  19 #include "omapdss.h"
  20 #include "dss.h"
  21 #include "hdmi.h"
  22
  23 void hdmi_pll_dump(struct hdmi_pll_data *pll, struct seq_file *s)
  24 {
  25 #define DUMPPLL(r) seq_printf(s, "%-35s %08x\n", #r,\
  26                 hdmi_read_reg(pll->base, r))
  27
  28         DUMPPLL(PLLCTRL_PLL_CONTROL);
  29         DUMPPLL(PLLCTRL_PLL_STATUS);
  30         DUMPPLL(PLLCTRL_PLL_GO);
  31         DUMPPLL(PLLCTRL_CFG1);
  32         DUMPPLL(PLLCTRL_CFG2);
  33         DUMPPLL(PLLCTRL_CFG3);
  34         DUMPPLL(PLLCTRL_SSC_CFG1);
  35         DUMPPLL(PLLCTRL_SSC_CFG2);
  36         DUMPPLL(PLLCTRL_CFG4);
  37 }
  38
  39 static int hdmi_pll_enable(struct dss_pll *dsspll)
  40 {
  41         struct hdmi_pll_data *pll = container_of(dsspll, struct hdmi_pll_data, pll);
  42         struct hdmi_wp_data *wp = pll->wp;
  43         int r;
  44
  45         r = pm_runtime_get_sync(&pll->pdev->dev);
  46         WARN_ON(r < 0);
  47
  48         dss_ctrl_pll_enable(dsspll, true);
  49
  50         r = hdmi_wp_set_pll_pwr(wp, HDMI_PLLPWRCMD_BOTHON_ALLCLKS);
  51         if (r)
  52                 return r;
  53
  54         return 0;
  55 }
  56
  57 static void hdmi_pll_disable(struct dss_pll *dsspll)
  58 {
  59         struct hdmi_pll_data *pll = container_of(dsspll, struct hdmi_pll_data, pll);
  60         struct hdmi_wp_data *wp = pll->wp;
  61         int r;
  62
  63         hdmi_wp_set_pll_pwr(wp, HDMI_PLLPWRCMD_ALLOFF);
  64
  65         dss_ctrl_pll_enable(dsspll, false);
  66
  67         r = pm_runtime_put_sync(&pll->pdev->dev);
  68         WARN_ON(r < 0 && r != -ENOSYS);
  69 }
  70
  71 static const struct dss_pll_ops hdmi_pll_ops = {
  72         .enable = hdmi_pll_enable,
  73         .disable = hdmi_pll_disable,
  74         .set_config = dss_pll_write_config_type_b,
  75 };
  76
  77 static const struct dss_pll_hw dss_omap4_hdmi_pll_hw = {
  78         .type = DSS_PLL_TYPE_B,
  79
  80         .n_max = 255,
  81         .m_min = 20,
  82         .m_max = 4095,
  83         .mX_max = 127,
  84         .fint_min = 500000,
  85         .fint_max = 2500000,
  86
  87         .clkdco_min = 500000000,
  88         .clkdco_low = 1000000000,
  89         .clkdco_max = 2000000000,
  90
  91         .n_msb = 8,
  92         .n_lsb = 1,
  93         .m_msb = 20,
  94         .m_lsb = 9,
  95
  96         .mX_msb[0] = 24,
  97         .mX_lsb[0] = 18,
  98
  99         .has_selfreqdco = true,
 100 };
 101
 102 static const struct dss_pll_hw dss_omap5_hdmi_pll_hw = {
 103         .type = DSS_PLL_TYPE_B,
 104
 105         .n_max = 255,
 106         .m_min = 20,
 107         .m_max = 2045,
 108         .mX_max = 127,
 109         .fint_min = 620000,
 110         .fint_max = 2500000,
 111
 112         .clkdco_min = 750000000,
 113         .clkdco_low = 1500000000,
 114         .clkdco_max = 2500000000UL,
 115
 116         .n_msb = 8,
 117         .n_lsb = 1,
 118         .m_msb = 20,
 119         .m_lsb = 9,
 120
 121         .mX_msb[0] = 24,
 122         .mX_lsb[0] = 18,
 123
 124         .has_selfreqdco = true,
 125         .has_refsel = true,
 126 };
 127
 128 static int hdmi_init_pll_data(struct dss_device *dss,
 129                               struct platform_device *pdev,
 130                               struct hdmi_pll_data *hpll)
 131 {
 132         struct dss_pll *pll = &hpll->pll;
 133         struct clk *clk;
 134         int r;
 135
 136         clk = devm_clk_get(&pdev->dev, "sys_clk");
 137         if (IS_ERR(clk)) {
 138                 DSSERR("can't get sys_clk\n");
 139                 return PTR_ERR(clk);
 140         }
 141
 142         pll->name = "hdmi";
 143         pll->id = DSS_PLL_HDMI;
 144         pll->base = hpll->base;
 145         pll->clkin = clk;
 146
 147         if (hpll->wp->version == 4)
 148                 pll->hw = &dss_omap4_hdmi_pll_hw;
 149         else
 150                 pll->hw = &dss_omap5_hdmi_pll_hw;
 151
 152         pll->ops = &hdmi_pll_ops;
 153
 154         r = dss_pll_register(dss, pll);
 155         if (r)
 156                 return r;
 157
 158         return 0;
 159 }
 160
 161 int hdmi_pll_init(struct dss_device *dss, struct platform_device *pdev,
 162                   struct hdmi_pll_data *pll, struct hdmi_wp_data *wp)
 163 {
 164         int r;
 165
 166         pll->pdev = pdev;
 167         pll->wp = wp;
 168
 169         pll->base = devm_platform_ioremap_resource_byname(pdev, "pll");
 170         if (IS_ERR(pll->base))
 171                 return PTR_ERR(pll->base);
 172
 173         r = hdmi_init_pll_data(dss, pdev, pll);
 174         if (r) {
 175                 DSSERR("failed to init HDMI PLL\n");
 176                 return r;
 177         }
 178
 179         return 0;
 180 }
 181
 182 void hdmi_pll_uninit(struct hdmi_pll_data *hpll)
 183 {
 184         struct dss_pll *pll = &hpll->pll;
 185
 186         dss_pll_unregister(pll);
 187 }