drivers/clk/meson/meson8-ddr.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Amlogic Meson8 DDR clock controller
   4  *
   5  * Copyright (C) 2019 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
   6  */
   7
   8 #include <dt-bindings/clock/meson8-ddr-clkc.h>
   9
  10 #include <linux/clk-provider.h>
  11 #include <linux/platform_device.h>
  12
  13 #include "clk-regmap.h"
  14 #include "clk-pll.h"
  15
  16 #define AM_DDR_PLL_CNTL                 0x00
  17 #define AM_DDR_PLL_CNTL1                0x04
  18 #define AM_DDR_PLL_CNTL2                0x08
  19 #define AM_DDR_PLL_CNTL3                0x0c
  20 #define AM_DDR_PLL_CNTL4                0x10
  21 #define AM_DDR_PLL_STS                  0x14
  22 #define DDR_CLK_CNTL                    0x18
  23 #define DDR_CLK_STS                     0x1c
  24
  25 static struct clk_regmap meson8_ddr_pll_dco = {
  26         .data = &(struct meson_clk_pll_data){
  27                 .en = {
  28                         .reg_off = AM_DDR_PLL_CNTL,
  29                         .shift   = 30,
  30                         .width   = 1,
  31                 },
  32                 .m = {
  33                         .reg_off = AM_DDR_PLL_CNTL,
  34                         .shift   = 0,
  35                         .width   = 9,
  36                 },
  37                 .n = {
  38                         .reg_off = AM_DDR_PLL_CNTL,
  39                         .shift   = 9,
  40                         .width   = 5,
  41                 },
  42                 .l = {
  43                         .reg_off = AM_DDR_PLL_CNTL,
  44                         .shift   = 31,
  45                         .width   = 1,
  46                 },
  47                 .rst = {
  48                         .reg_off = AM_DDR_PLL_CNTL,
  49                         .shift   = 29,
  50                         .width   = 1,
  51                 },
  52         },
  53         .hw.init = &(struct clk_init_data){
  54                 .name = "ddr_pll_dco",
  55                 .ops = &meson_clk_pll_ro_ops,
  56                 .parent_data = &(const struct clk_parent_data) {
  57                         .fw_name = "xtal",
  58                 },
  59                 .num_parents = 1,
  60         },
  61 };
  62
  63 static struct clk_regmap meson8_ddr_pll = {
  64         .data = &(struct clk_regmap_div_data){
  65                 .offset = AM_DDR_PLL_CNTL,
  66                 .shift = 16,
  67                 .width = 2,
  68                 .flags = CLK_DIVIDER_POWER_OF_TWO,
  69         },
  70         .hw.init = &(struct clk_init_data){
  71                 .name = "ddr_pll",
  72                 .ops = &clk_regmap_divider_ro_ops,
  73                 .parent_hws = (const struct clk_hw *[]) {
  74                         &meson8_ddr_pll_dco.hw
  75                 },
  76                 .num_parents = 1,
  77         },
  78 };
  79
  80 static struct clk_hw_onecell_data meson8_ddr_clk_hw_onecell_data = {
  81         .hws = {
  82                 [DDR_CLKID_DDR_PLL_DCO]         = &meson8_ddr_pll_dco.hw,
  83                 [DDR_CLKID_DDR_PLL]             = &meson8_ddr_pll.hw,
  84         },
  85         .num = 2,
  86 };
  87
  88 static struct clk_regmap *const meson8_ddr_clk_regmaps[] = {
  89         &meson8_ddr_pll_dco,
  90         &meson8_ddr_pll,
  91 };
  92
  93 static const struct regmap_config meson8_ddr_clkc_regmap_config = {
  94         .reg_bits = 8,
  95         .val_bits = 32,
  96         .reg_stride = 4,
  97         .max_register = DDR_CLK_STS,
  98 };
  99
 100 static int meson8_ddr_clkc_probe(struct platform_device *pdev)
 101 {
 102         struct regmap *regmap;
 103         void __iomem *base;
 104         struct clk_hw *hw;
 105         int ret, i;
 106
 107         base = devm_platform_ioremap_resource(pdev, 0);
 108         if (IS_ERR(base))
 109                 return PTR_ERR(base);
 110
 111         regmap = devm_regmap_init_mmio(&pdev->dev, base,
 112                                        &meson8_ddr_clkc_regmap_config);
 113         if (IS_ERR(regmap))
 114                 return PTR_ERR(regmap);
 115
 116         /* Populate regmap */
 117         for (i = 0; i < ARRAY_SIZE(meson8_ddr_clk_regmaps); i++)
 118                 meson8_ddr_clk_regmaps[i]->map = regmap;
 119
 120         /* Register all clks */
 121         for (i = 0; i < meson8_ddr_clk_hw_onecell_data.num; i++) {
 122                 hw = meson8_ddr_clk_hw_onecell_data.hws[i];
 123
 124                 ret = devm_clk_hw_register(&pdev->dev, hw);
 125                 if (ret) {
 126                         dev_err(&pdev->dev, "Clock registration failed\n");
 127                         return ret;
 128                 }
 129         }
 130
 131         return devm_of_clk_add_hw_provider(&pdev->dev, of_clk_hw_onecell_get,
 132                                            &meson8_ddr_clk_hw_onecell_data);
 133 }
 134
 135 static const struct of_device_id meson8_ddr_clkc_match_table[] = {
 136         { .compatible = "amlogic,meson8-ddr-clkc" },
 137         { .compatible = "amlogic,meson8b-ddr-clkc" },
 138         { /* sentinel */ }
 139 };
 140
 141 static struct platform_driver meson8_ddr_clkc_driver = {
 142         .probe          = meson8_ddr_clkc_probe,
 143         .driver         = {
 144                 .name   = "meson8-ddr-clkc",
 145                 .of_match_table = meson8_ddr_clkc_match_table,
 146         },
 147 };
 148
 149 builtin_platform_driver(meson8_ddr_clkc_driver);