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         DEFINE_RES_MEM(0x0, 4)
  24 };
  25
  26 static const struct resource sun6i_a31_apb0_clk_res[] = {
  27         DEFINE_RES_MEM(0xc, 4)
  28 };
  29
  30 static const struct resource sun6i_a31_apb0_gates_clk_res[] = {
  31         DEFINE_RES_MEM(0x28, 4)
  32 };
  33
  34 static const struct resource sun6i_a31_ir_clk_res[] = {
  35         DEFINE_RES_MEM(0x54, 4)
  36 };
  37
  38 static const struct resource sun6i_a31_apb0_rstc_res[] = {
  39         DEFINE_RES_MEM(0xb0, 4)
  40 };
  41
  42 static const struct resource sun8i_codec_analog_res[] = {
  43         DEFINE_RES_MEM(SUN8I_CODEC_ANALOG_BASE, SUN8I_CODEC_ANALOG_SIZE),
  44 };
  45
  46 static const struct mfd_cell sun6i_a31_prcm_subdevs[] = {
  47         {
  48                 .name = "sun6i-a31-ar100-clk",
  49                 .of_compatible = "allwinner,sun6i-a31-ar100-clk",
  50                 .num_resources = ARRAY_SIZE(sun6i_a31_ar100_clk_res),
  51                 .resources = sun6i_a31_ar100_clk_res,
  52         },
  53         {
  54                 .name = "sun6i-a31-apb0-clk",
  55                 .of_compatible = "allwinner,sun6i-a31-apb0-clk",
  56                 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_clk_res),
  57                 .resources = sun6i_a31_apb0_clk_res,
  58         },
  59         {
  60                 .name = "sun6i-a31-apb0-gates-clk",
  61                 .of_compatible = "allwinner,sun6i-a31-apb0-gates-clk",
  62                 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_gates_clk_res),
  63                 .resources = sun6i_a31_apb0_gates_clk_res,
  64         },
  65         {
  66                 .name = "sun6i-a31-ir-clk",
  67                 .of_compatible = "allwinner,sun4i-a10-mod0-clk",
  68                 .num_resources = ARRAY_SIZE(sun6i_a31_ir_clk_res),
  69                 .resources = sun6i_a31_ir_clk_res,
  70         },
  71         {
  72                 .name = "sun6i-a31-apb0-clock-reset",
  73                 .of_compatible = "allwinner,sun6i-a31-clock-reset",
  74                 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_rstc_res),
  75                 .resources = sun6i_a31_apb0_rstc_res,
  76         },
  77 };
  78
  79 static const struct mfd_cell sun8i_a23_prcm_subdevs[] = {
  80         {
  81                 .name = "sun8i-a23-apb0-clk",
  82                 .of_compatible = "allwinner,sun8i-a23-apb0-clk",
  83                 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_clk_res),
  84                 .resources = sun6i_a31_apb0_clk_res,
  85         },
  86         {
  87                 .name = "sun6i-a31-apb0-gates-clk",
  88                 .of_compatible = "allwinner,sun8i-a23-apb0-gates-clk",
  89                 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_gates_clk_res),
  90                 .resources = sun6i_a31_apb0_gates_clk_res,
  91         },
  92         {
  93                 .name = "sun6i-a31-apb0-clock-reset",
  94                 .of_compatible = "allwinner,sun6i-a31-clock-reset",
  95                 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_rstc_res),
  96                 .resources = sun6i_a31_apb0_rstc_res,
  97         },
  98         {
  99                 .name           = "sun8i-codec-analog",
 100                 .of_compatible  = "allwinner,sun8i-a23-codec-analog",
 101                 .num_resources  = ARRAY_SIZE(sun8i_codec_analog_res),
 102                 .resources      = sun8i_codec_analog_res,
 103         },
 104 };
 105
 106 static const struct prcm_data sun6i_a31_prcm_data = {
 107         .nsubdevs = ARRAY_SIZE(sun6i_a31_prcm_subdevs),
 108         .subdevs = sun6i_a31_prcm_subdevs,
 109 };
 110
 111 static const struct prcm_data sun8i_a23_prcm_data = {
 112         .nsubdevs = ARRAY_SIZE(sun8i_a23_prcm_subdevs),
 113         .subdevs = sun8i_a23_prcm_subdevs,
 114 };
 115
 116 static const struct of_device_id sun6i_prcm_dt_ids[] = {
 117         {
 118                 .compatible = "allwinner,sun6i-a31-prcm",
 119                 .data = &sun6i_a31_prcm_data,
 120         },
 121         {
 122                 .compatible = "allwinner,sun8i-a23-prcm",
 123                 .data = &sun8i_a23_prcm_data,
 124         },
 125         { /* sentinel */ },
 126 };
 127
 128 static int sun6i_prcm_probe(struct platform_device *pdev)
 129 {
 130         const struct of_device_id *match;
 131         const struct prcm_data *data;
 132         struct resource *res;
 133         int ret;
 134
 135         match = of_match_node(sun6i_prcm_dt_ids, pdev->dev.of_node);
 136         if (!match)
 137                 return -EINVAL;
 138
 139         data = match->data;
 140
 141         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 142         if (!res) {
 143                 dev_err(&pdev->dev, "no prcm memory region provided\n");
 144                 return -ENOENT;
 145         }
 146
 147         ret = mfd_add_devices(&pdev->dev, 0, data->subdevs, data->nsubdevs,
 148                               res, -1, NULL);
 149         if (ret) {
 150                 dev_err(&pdev->dev, "failed to add subdevices\n");
 151                 return ret;
 152         }
 153
 154         return 0;
 155 }
 156
 157 static struct platform_driver sun6i_prcm_driver = {
 158         .driver = {
 159                 .name = "sun6i-prcm",
 160                 .of_match_table = sun6i_prcm_dt_ids,
 161         },
 162         .probe = sun6i_prcm_probe,
 163 };
 164 builtin_platform_driver(sun6i_prcm_driver);