drivers/mfd/sun6i-prcm.c

   1 /*
   2  * Copyright (C) 2014 Free Electrons
   3  *
   4  * License Terms: GNU General Public License v2
   5  * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
   6  *
   7  * Allwinner PRCM (Power/Reset/Clock Management) driver
   8  *
   9  */
  10
  11 #include <linux/mfd/core.h>
  12 #include <linux/init.h>
  13 #include <linux/of.h>
  14
  15 #define SUN8I_CODEC_ANALOG_BASE 0x1c0
  16 #define SUN8I_CODEC_ANALOG_SIZE 0x4
  17
  18 struct prcm_data {
  19         int nsubdevs;
  20         const struct mfd_cell *subdevs;
  21 };
  22
  23 static const struct resource sun6i_a31_ar100_clk_res[] = {
  24         {
  25                 .start = 0x0,
  26                 .end = 0x3,
  27                 .flags = IORESOURCE_MEM,
  28         },
  29 };
  30
  31 static const struct resource sun6i_a31_apb0_clk_res[] = {
  32         {
  33                 .start = 0xc,
  34                 .end = 0xf,
  35                 .flags = IORESOURCE_MEM,
  36         },
  37 };
  38
  39 static const struct resource sun6i_a31_apb0_gates_clk_res[] = {
  40         {
  41                 .start = 0x28,
  42                 .end = 0x2b,
  43                 .flags = IORESOURCE_MEM,
  44         },
  45 };
  46
  47 static const struct resource sun6i_a31_ir_clk_res[] = {
  48         {
  49                 .start = 0x54,
  50                 .end = 0x57,
  51                 .flags = IORESOURCE_MEM,
  52         },
  53 };
  54
  55 static const struct resource sun6i_a31_apb0_rstc_res[] = {
  56         {
  57                 .start = 0xb0,
  58                 .end = 0xb3,
  59                 .flags = IORESOURCE_MEM,
  60         },
  61 };
  62
  63 static const struct resource sun8i_codec_analog_res[] = {
  64         DEFINE_RES_MEM(SUN8I_CODEC_ANALOG_BASE, SUN8I_CODEC_ANALOG_SIZE),
  65 };
  66
  67 static const struct mfd_cell sun6i_a31_prcm_subdevs[] = {
  68         {
  69                 .name = "sun6i-a31-ar100-clk",
  70                 .of_compatible = "allwinner,sun6i-a31-ar100-clk",
  71                 .num_resources = ARRAY_SIZE(sun6i_a31_ar100_clk_res),
  72                 .resources = sun6i_a31_ar100_clk_res,
  73         },
  74         {
  75                 .name = "sun6i-a31-apb0-clk",
  76                 .of_compatible = "allwinner,sun6i-a31-apb0-clk",
  77                 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_clk_res),
  78                 .resources = sun6i_a31_apb0_clk_res,
  79         },
  80         {
  81                 .name = "sun6i-a31-apb0-gates-clk",
  82                 .of_compatible = "allwinner,sun6i-a31-apb0-gates-clk",
  83                 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_gates_clk_res),
  84                 .resources = sun6i_a31_apb0_gates_clk_res,
  85         },
  86         {
  87                 .name = "sun6i-a31-ir-clk",
  88                 .of_compatible = "allwinner,sun4i-a10-mod0-clk",
  89                 .num_resources = ARRAY_SIZE(sun6i_a31_ir_clk_res),
  90                 .resources = sun6i_a31_ir_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
 100 static const struct mfd_cell sun8i_a23_prcm_subdevs[] = {
 101         {
 102                 .name = "sun8i-a23-apb0-clk",
 103                 .of_compatible = "allwinner,sun8i-a23-apb0-clk",
 104                 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_clk_res),
 105                 .resources = sun6i_a31_apb0_clk_res,
 106         },
 107         {
 108                 .name = "sun6i-a31-apb0-gates-clk",
 109                 .of_compatible = "allwinner,sun8i-a23-apb0-gates-clk",
 110                 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_gates_clk_res),
 111                 .resources = sun6i_a31_apb0_gates_clk_res,
 112         },
 113         {
 114                 .name = "sun6i-a31-apb0-clock-reset",
 115                 .of_compatible = "allwinner,sun6i-a31-clock-reset",
 116                 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_rstc_res),
 117                 .resources = sun6i_a31_apb0_rstc_res,
 118         },
 119         {
 120                 .name           = "sun8i-codec-analog",
 121                 .of_compatible  = "allwinner,sun8i-a23-codec-analog",
 122                 .num_resources  = ARRAY_SIZE(sun8i_codec_analog_res),
 123                 .resources      = sun8i_codec_analog_res,
 124         },
 125 };
 126
 127 static const struct prcm_data sun6i_a31_prcm_data = {
 128         .nsubdevs = ARRAY_SIZE(sun6i_a31_prcm_subdevs),
 129         .subdevs = sun6i_a31_prcm_subdevs,
 130 };
 131
 132 static const struct prcm_data sun8i_a23_prcm_data = {
 133         .nsubdevs = ARRAY_SIZE(sun8i_a23_prcm_subdevs),
 134         .subdevs = sun8i_a23_prcm_subdevs,
 135 };
 136
 137 static const struct of_device_id sun6i_prcm_dt_ids[] = {
 138         {
 139                 .compatible = "allwinner,sun6i-a31-prcm",
 140                 .data = &sun6i_a31_prcm_data,
 141         },
 142         {
 143                 .compatible = "allwinner,sun8i-a23-prcm",
 144                 .data = &sun8i_a23_prcm_data,
 145         },
 146         { /* sentinel */ },
 147 };
 148
 149 static int sun6i_prcm_probe(struct platform_device *pdev)
 150 {
 151         const struct of_device_id *match;
 152         const struct prcm_data *data;
 153         struct resource *res;
 154         int ret;
 155
 156         match = of_match_node(sun6i_prcm_dt_ids, pdev->dev.of_node);
 157         if (!match)
 158                 return -EINVAL;
 159
 160         data = match->data;
 161
 162         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 163         if (!res) {
 164                 dev_err(&pdev->dev, "no prcm memory region provided\n");
 165                 return -ENOENT;
 166         }
 167
 168         ret = mfd_add_devices(&pdev->dev, 0, data->subdevs, data->nsubdevs,
 169                               res, -1, NULL);
 170         if (ret) {
 171                 dev_err(&pdev->dev, "failed to add subdevices\n");
 172                 return ret;
 173         }
 174
 175         return 0;
 176 }
 177
 178 static struct platform_driver sun6i_prcm_driver = {
 179         .driver = {
 180                 .name = "sun6i-prcm",
 181                 .of_match_table = sun6i_prcm_dt_ids,
 182         },
 183         .probe = sun6i_prcm_probe,
 184 };
 185 builtin_platform_driver(sun6i_prcm_driver);