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

   1 /*
   2  * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 as published by
   6  * the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  */
  13
  14 #include <linux/clk.h>
  15 #include <linux/delay.h>
  16 #include <linux/err.h>
  17 #include <linux/io.h>
  18 #include <linux/kernel.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/sched.h>
  21
  22 #include "omapdss.h"
  23 #include "dss.h"
  24
  25 struct dss_video_pll {
  26         struct dss_pll pll;
  27
  28         struct device *dev;
  29
  30         void __iomem *clkctrl_base;
  31 };
  32
  33 #define REG_MOD(reg, val, start, end) \
  34         writel_relaxed(FLD_MOD(readl_relaxed(reg), val, start, end), reg)
  35
  36 static void dss_dpll_enable_scp_clk(struct dss_video_pll *vpll)
  37 {
  38         REG_MOD(vpll->clkctrl_base, 1, 14, 14); /* CIO_CLK_ICG */
  39 }
  40
  41 static void dss_dpll_disable_scp_clk(struct dss_video_pll *vpll)
  42 {
  43         REG_MOD(vpll->clkctrl_base, 0, 14, 14); /* CIO_CLK_ICG */
  44 }
  45
  46 static void dss_dpll_power_enable(struct dss_video_pll *vpll)
  47 {
  48         REG_MOD(vpll->clkctrl_base, 2, 31, 30); /* PLL_POWER_ON_ALL */
  49
  50         /*
  51          * DRA7x PLL CTRL's PLL_PWR_STATUS seems to always return 0,
  52          * so we have to use fixed delay here.
  53          */
  54         msleep(1);
  55 }
  56
  57 static void dss_dpll_power_disable(struct dss_video_pll *vpll)
  58 {
  59         REG_MOD(vpll->clkctrl_base, 0, 31, 30); /* PLL_POWER_OFF */
  60 }
  61
  62 static int dss_video_pll_enable(struct dss_pll *pll)
  63 {
  64         struct dss_video_pll *vpll = container_of(pll, struct dss_video_pll, pll);
  65         int r;
  66
  67         r = dss_runtime_get();
  68         if (r)
  69                 return r;
  70
  71         dss_ctrl_pll_enable(pll->id, true);
  72
  73         dss_dpll_enable_scp_clk(vpll);
  74
  75         r = dss_pll_wait_reset_done(pll);
  76         if (r)
  77                 goto err_reset;
  78
  79         dss_dpll_power_enable(vpll);
  80
  81         return 0;
  82
  83 err_reset:
  84         dss_dpll_disable_scp_clk(vpll);
  85         dss_ctrl_pll_enable(pll->id, false);
  86         dss_runtime_put();
  87
  88         return r;
  89 }
  90
  91 static void dss_video_pll_disable(struct dss_pll *pll)
  92 {
  93         struct dss_video_pll *vpll = container_of(pll, struct dss_video_pll, pll);
  94
  95         dss_dpll_power_disable(vpll);
  96
  97         dss_dpll_disable_scp_clk(vpll);
  98
  99         dss_ctrl_pll_enable(pll->id, false);
 100
 101         dss_runtime_put();
 102 }
 103
 104 static const struct dss_pll_ops dss_pll_ops = {
 105         .enable = dss_video_pll_enable,
 106         .disable = dss_video_pll_disable,
 107         .set_config = dss_pll_write_config_type_a,
 108 };
 109
 110 static const struct dss_pll_hw dss_dra7_video_pll_hw = {
 111         .type = DSS_PLL_TYPE_A,
 112
 113         .n_max = (1 << 8) - 1,
 114         .m_max = (1 << 12) - 1,
 115         .mX_max = (1 << 5) - 1,
 116         .fint_min = 500000,
 117         .fint_max = 2500000,
 118         .clkdco_max = 1800000000,
 119
 120         .n_msb = 8,
 121         .n_lsb = 1,
 122         .m_msb = 20,
 123         .m_lsb = 9,
 124
 125         .mX_msb[0] = 25,
 126         .mX_lsb[0] = 21,
 127         .mX_msb[1] = 30,
 128         .mX_lsb[1] = 26,
 129         .mX_msb[2] = 4,
 130         .mX_lsb[2] = 0,
 131         .mX_msb[3] = 9,
 132         .mX_lsb[3] = 5,
 133
 134         .has_refsel = true,
 135
 136         .errata_i886 = true,
 137 };
 138
 139 struct dss_pll *dss_video_pll_init(struct platform_device *pdev, int id,
 140         struct regulator *regulator)
 141 {
 142         const char * const reg_name[] = { "pll1", "pll2" };
 143         const char * const clkctrl_name[] = { "pll1_clkctrl", "pll2_clkctrl" };
 144         const char * const clkin_name[] = { "video1_clk", "video2_clk" };
 145
 146         struct resource *res;
 147         struct dss_video_pll *vpll;
 148         void __iomem *pll_base, *clkctrl_base;
 149         struct clk *clk;
 150         struct dss_pll *pll;
 151         int r;
 152
 153         /* PLL CONTROL */
 154
 155         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, reg_name[id]);
 156         pll_base = devm_ioremap_resource(&pdev->dev, res);
 157         if (IS_ERR(pll_base))
 158                 return ERR_CAST(pll_base);
 159
 160         /* CLOCK CONTROL */
 161
 162         res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 163                 clkctrl_name[id]);
 164         clkctrl_base = devm_ioremap_resource(&pdev->dev, res);
 165         if (IS_ERR(clkctrl_base))
 166                 return ERR_CAST(clkctrl_base);
 167
 168         /* CLKIN */
 169
 170         clk = devm_clk_get(&pdev->dev, clkin_name[id]);
 171         if (IS_ERR(clk)) {
 172                 DSSERR("can't get video pll clkin\n");
 173                 return ERR_CAST(clk);
 174         }
 175
 176         vpll = devm_kzalloc(&pdev->dev, sizeof(*vpll), GFP_KERNEL);
 177         if (!vpll)
 178                 return ERR_PTR(-ENOMEM);
 179
 180         vpll->dev = &pdev->dev;
 181         vpll->clkctrl_base = clkctrl_base;
 182
 183         pll = &vpll->pll;
 184
 185         pll->name = id == 0 ? "video0" : "video1";
 186         pll->id = id == 0 ? DSS_PLL_VIDEO1 : DSS_PLL_VIDEO2;
 187         pll->clkin = clk;
 188         pll->regulator = regulator;
 189         pll->base = pll_base;
 190         pll->hw = &dss_dra7_video_pll_hw;
 191         pll->ops = &dss_pll_ops;
 192
 193         r = dss_pll_register(pll);
 194         if (r)
 195                 return ERR_PTR(r);
 196
 197         return pll;
 198 }
 199
 200 void dss_video_pll_uninit(struct dss_pll *pll)
 201 {
 202         dss_pll_unregister(pll);
 203 }