kernel/drivers/video/fbdev/omap2/dss/video-pll.c

   1 /*
   2 * Copyright (C) 2014 Texas Instruments Ltd
   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 * You should have received a copy of the GNU General Public License along with
   9 * this program.  If not, see <http://www.gnu.org/licenses/>.
  10 */
  11
  12 #include <linux/clk.h>
  13 #include <linux/delay.h>
  14 #include <linux/err.h>
  15 #include <linux/io.h>
  16 #include <linux/kernel.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/sched.h>
  19
  20 #include <video/omapdss.h>
  21
  22 #include "dss.h"
  23 #include "dss_features.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         .n_max = (1 << 8) - 1,
 112         .m_max = (1 << 12) - 1,
 113         .mX_max = (1 << 5) - 1,
 114         .fint_min = 500000,
 115         .fint_max = 2500000,
 116         .clkdco_max = 1800000000,
 117
 118         .n_msb = 8,
 119         .n_lsb = 1,
 120         .m_msb = 20,
 121         .m_lsb = 9,
 122
 123         .mX_msb[0] = 25,
 124         .mX_lsb[0] = 21,
 125         .mX_msb[1] = 30,
 126         .mX_lsb[1] = 26,
 127
 128         .has_refsel = true,
 129 };
 130
 131 struct dss_pll *dss_video_pll_init(struct platform_device *pdev, int id,
 132         struct regulator *regulator)
 133 {
 134         const char * const reg_name[] = { "pll1", "pll2" };
 135         const char * const clkctrl_name[] = { "pll1_clkctrl", "pll2_clkctrl" };
 136         const char * const clkin_name[] = { "video1_clk", "video2_clk" };
 137
 138         struct resource *res;
 139         struct dss_video_pll *vpll;
 140         void __iomem *pll_base, *clkctrl_base;
 141         struct clk *clk;
 142         struct dss_pll *pll;
 143         int r;
 144
 145         /* PLL CONTROL */
 146
 147         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, reg_name[id]);
 148         if (!res) {
 149                 dev_err(&pdev->dev,
 150                         "missing platform resource data for pll%d\n", id);
 151                 return ERR_PTR(-ENODEV);
 152         }
 153
 154         pll_base = devm_ioremap_resource(&pdev->dev, res);
 155         if (IS_ERR(pll_base)) {
 156                 dev_err(&pdev->dev, "failed to ioremap pll%d reg_name\n", id);
 157                 return ERR_CAST(pll_base);
 158         }
 159
 160         /* CLOCK CONTROL */
 161
 162         res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 163                 clkctrl_name[id]);
 164         if (!res) {
 165                 dev_err(&pdev->dev,
 166                         "missing platform resource data for pll%d\n", id);
 167                 return ERR_PTR(-ENODEV);
 168         }
 169
 170         clkctrl_base = devm_ioremap_resource(&pdev->dev, res);
 171         if (IS_ERR(clkctrl_base)) {
 172                 dev_err(&pdev->dev, "failed to ioremap pll%d clkctrl\n", id);
 173                 return ERR_CAST(clkctrl_base);
 174         }
 175
 176         /* CLKIN */
 177
 178         clk = devm_clk_get(&pdev->dev, clkin_name[id]);
 179         if (IS_ERR(clk)) {
 180                 DSSERR("can't get video pll clkin\n");
 181                 return ERR_CAST(clk);
 182         }
 183
 184         vpll = devm_kzalloc(&pdev->dev, sizeof(*vpll), GFP_KERNEL);
 185         if (!vpll)
 186                 return ERR_PTR(-ENOMEM);
 187
 188         vpll->dev = &pdev->dev;
 189         vpll->clkctrl_base = clkctrl_base;
 190
 191         pll = &vpll->pll;
 192
 193         pll->name = id == 0 ? "video0" : "video1";
 194         pll->id = id == 0 ? DSS_PLL_VIDEO1 : DSS_PLL_VIDEO2;
 195         pll->clkin = clk;
 196         pll->regulator = regulator;
 197         pll->base = pll_base;
 198         pll->hw = &dss_dra7_video_pll_hw;
 199         pll->ops = &dss_pll_ops;
 200
 201         r = dss_pll_register(pll);
 202         if (r)
 203                 return ERR_PTR(r);
 204
 205         return pll;
 206 }
 207
 208 void dss_video_pll_uninit(struct dss_pll *pll)
 209 {
 210         dss_pll_unregister(pll);
 211 }