drivers/mfd/sun6i-prcm.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2014 Free Electrons
   4  *
   5  * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
   6  *
   7  * Allwinner PRCM (Power/Reset/Clock Management) driver
   8  */
   9
  10 #include <linux/mfd/core.h>
  11 #include <linux/init.h>
  12 #include <linux/of.h>
  13
  14 #define SUN8I_CODEC_ANALOG_BASE 0x1c0
  15 #define SUN8I_CODEC_ANALOG_SIZE 0x4
  16
  17 struct prcm_data {
  18         int nsubdevs;
  19         const struct mfd_cell *subdevs;
  20 };
  21
  22 static const struct resource sun6i_a31_ar100_clk_res[] = {
  23         {
  24                 .start = 0x0,
  25                 .end = 0x3,
  26                 .flags = IORESOURCE_MEM,
  27         },
  28 };
  29
  30 static const struct resource sun6i_a31_apb0_clk_res[] = {
  31         {
  32                 .start = 0xc,
  33                 .end = 0xf,
  34                 .flags = IORESOURCE_MEM,
  35         },
  36 };
  37
  38 static const struct resource sun6i_a31_apb0_gates_clk_res[] = {
  39         {
  40                 .start = 0x28,
  41                 .end = 0x2b,
  42                 .flags = IORESOURCE_MEM,
  43         },
  44 };
  45
  46 static const struct resource sun6i_a31_ir_clk_res[] = {
  47         {
  48                 .start = 0x54,
  49                 .end = 0x57,
  50                 .flags = IORESOURCE_MEM,
  51         },
  52 };
  53
  54 static const struct resource sun6i_a31_apb0_rstc_res[] = {
  55         {
  56                 .start = 0xb0,
  57                 .end = 0xb3,
  58                 .flags = IORESOURCE_MEM,
  59         },
  60 };
  61
  62 static const struct resource sun8i_codec_analog_res[] = {
  63         DEFINE_RES_MEM(SUN8I_CODEC_ANALOG_BASE, SUN8I_CODEC_ANALOG_SIZE),
  64 };
  65
  66 static const struct mfd_cell sun6i_a31_prcm_subdevs[] = {
  67         {
  68                 .name = "sun6i-a31-ar100-clk",
  69                 .of_compatible = "allwinner,sun6i-a31-ar100-clk",
  70                 .num_resources = ARRAY_SIZE(sun6i_a31_ar100_clk_res),
  71                 .resources = sun6i_a31_ar100_clk_res,
  72         },
  73         {
  74                 .name = "sun6i-a31-apb0-clk",
  75                 .of_compatible = "allwinner,sun6i-a31-apb0-clk",
  76                 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_clk_res),
  77                 .resources = sun6i_a31_apb0_clk_res,
  78         },
  79         {
  80                 .name = "sun6i-a31-apb0-gates-clk",
  81                 .of_compatible = "allwinner,sun6i-a31-apb0-gates-clk",
  82                 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_gates_clk_res),
  83                 .resources = sun6i_a31_apb0_gates_clk_res,
  84         },
  85         {
  86                 .name = "sun6i-a31-ir-clk",
  87                 .of_compatible = "allwinner,sun4i-a10-mod0-clk",
  88                 .num_resources = ARRAY_SIZE(sun6i_a31_ir_clk_res),
  89                 .resources = sun6i_a31_ir_clk_res,
  90         },
  91         {
  92                 .name = "sun6i-a31-apb0-clock-reset",
  93                 .of_compatible = "allwinner,sun6i-a31-clock-reset",
  94                 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_rstc_res),
  95                 .resources = sun6i_a31_apb0_rstc_res,
  96         },
  97 };
  98
  99 static const struct mfd_cell sun8i_a23_prcm_subdevs[] = {
 100         {
 101                 .name = "sun8i-a23-apb0-clk",
 102                 .of_compatible = "allwinner,sun8i-a23-apb0-clk",
 103                 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_clk_res),
 104                 .resources = sun6i_a31_apb0_clk_res,
 105         },
 106         {
 107                 .name = "sun6i-a31-apb0-gates-clk",
 108                 .of_compatible = "allwinner,sun8i-a23-apb0-gates-clk",
 109                 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_gates_clk_res),
 110                 .resources = sun6i_a31_apb0_gates_clk_res,
 111         },
 112         {
 113                 .name = "sun6i-a31-apb0-clock-reset",
 114                 .of_compatible = "allwinner,sun6i-a31-clock-reset",
 115                 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_rstc_res),
 116                 .resources = sun6i_a31_apb0_rstc_res,
 117         },
 118         {
 119                 .name           = "sun8i-codec-analog",
 120                 .of_compatible  = "allwinner,sun8i-a23-codec-analog",
 121                 .num_resources  = ARRAY_SIZE(sun8i_codec_analog_res),
 122                 .resources      = sun8i_codec_analog_res,
 123         },
 124 };
 125
 126 static const struct prcm_data sun6i_a31_prcm_data = {
 127         .nsubdevs = ARRAY_SIZE(sun6i_a31_prcm_subdevs),
 128         .subdevs = sun6i_a31_prcm_subdevs,
 129 };
 130
 131 static const struct prcm_data sun8i_a23_prcm_data = {
 132         .nsubdevs = ARRAY_SIZE(sun8i_a23_prcm_subdevs),
 133         .subdevs = sun8i_a23_prcm_subdevs,
 134 };
 135
 136 static const struct of_device_id sun6i_prcm_dt_ids[] = {
 137         {
 138                 .compatible = "allwinner,sun6i-a31-prcm",
 139                 .data = &sun6i_a31_prcm_data,
 140         },
 141         {
 142                 .compatible = "allwinner,sun8i-a23-prcm",
 143                 .data = &sun8i_a23_prcm_data,
 144         },
 145         { /* sentinel */ },
 146 };
 147
 148 static int sun6i_prcm_probe(struct platform_device *pdev)
 149 {
 150         const struct of_device_id *match;
 151         const struct prcm_data *data;
 152         struct resource *res;
 153         int ret;
 154
 155         match = of_match_node(sun6i_prcm_dt_ids, pdev->dev.of_node);
 156         if (!match)
 157                 return -EINVAL;
 158
 159         data = match->data;
 160
 161         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 162         if (!res) {
 163                 dev_err(&pdev->dev, "no prcm memory region provided\n");
 164                 return -ENOENT;
 165         }
 166
 167         ret = mfd_add_devices(&pdev->dev, 0, data->subdevs, data->nsubdevs,
 168                               res, -1, NULL);
 169         if (ret) {
 170                 dev_err(&pdev->dev, "failed to add subdevices\n");
 171                 return ret;
 172         }
 173
 174         return 0;
 175 }
 176
 177 static struct platform_driver sun6i_prcm_driver = {
 178         .driver = {
 179                 .name = "sun6i-prcm",
 180                 .of_match_table = sun6i_prcm_dt_ids,
 181         },
 182         .probe = sun6i_prcm_probe,
 183 };
 184 builtin_platform_driver(sun6i_prcm_driver);