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 struct prcm_data {
  16         int nsubdevs;
  17         const struct mfd_cell *subdevs;
  18 };
  19
  20 static const struct resource sun6i_a31_ar100_clk_res[] = {
  21         {
  22                 .start = 0x0,
  23                 .end = 0x3,
  24                 .flags = IORESOURCE_MEM,
  25         },
  26 };
  27
  28 static const struct resource sun6i_a31_apb0_clk_res[] = {
  29         {
  30                 .start = 0xc,
  31                 .end = 0xf,
  32                 .flags = IORESOURCE_MEM,
  33         },
  34 };
  35
  36 static const struct resource sun6i_a31_apb0_gates_clk_res[] = {
  37         {
  38                 .start = 0x28,
  39                 .end = 0x2b,
  40                 .flags = IORESOURCE_MEM,
  41         },
  42 };
  43
  44 static const struct resource sun6i_a31_ir_clk_res[] = {
  45         {
  46                 .start = 0x54,
  47                 .end = 0x57,
  48                 .flags = IORESOURCE_MEM,
  49         },
  50 };
  51
  52 static const struct resource sun6i_a31_apb0_rstc_res[] = {
  53         {
  54                 .start = 0xb0,
  55                 .end = 0xb3,
  56                 .flags = IORESOURCE_MEM,
  57         },
  58 };
  59
  60 static const struct mfd_cell sun6i_a31_prcm_subdevs[] = {
  61         {
  62                 .name = "sun6i-a31-ar100-clk",
  63                 .of_compatible = "allwinner,sun6i-a31-ar100-clk",
  64                 .num_resources = ARRAY_SIZE(sun6i_a31_ar100_clk_res),
  65                 .resources = sun6i_a31_ar100_clk_res,
  66         },
  67         {
  68                 .name = "sun6i-a31-apb0-clk",
  69                 .of_compatible = "allwinner,sun6i-a31-apb0-clk",
  70                 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_clk_res),
  71                 .resources = sun6i_a31_apb0_clk_res,
  72         },
  73         {
  74                 .name = "sun6i-a31-apb0-gates-clk",
  75                 .of_compatible = "allwinner,sun6i-a31-apb0-gates-clk",
  76                 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_gates_clk_res),
  77                 .resources = sun6i_a31_apb0_gates_clk_res,
  78         },
  79         {
  80                 .name = "sun6i-a31-ir-clk",
  81                 .of_compatible = "allwinner,sun4i-a10-mod0-clk",
  82                 .num_resources = ARRAY_SIZE(sun6i_a31_ir_clk_res),
  83                 .resources = sun6i_a31_ir_clk_res,
  84         },
  85         {
  86                 .name = "sun6i-a31-apb0-clock-reset",
  87                 .of_compatible = "allwinner,sun6i-a31-clock-reset",
  88                 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_rstc_res),
  89                 .resources = sun6i_a31_apb0_rstc_res,
  90         },
  91 };
  92
  93 static const struct mfd_cell sun8i_a23_prcm_subdevs[] = {
  94         {
  95                 .name = "sun8i-a23-apb0-clk",
  96                 .of_compatible = "allwinner,sun8i-a23-apb0-clk",
  97                 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_clk_res),
  98                 .resources = sun6i_a31_apb0_clk_res,
  99         },
 100         {
 101                 .name = "sun6i-a31-apb0-gates-clk",
 102                 .of_compatible = "allwinner,sun8i-a23-apb0-gates-clk",
 103                 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_gates_clk_res),
 104                 .resources = sun6i_a31_apb0_gates_clk_res,
 105         },
 106         {
 107                 .name = "sun6i-a31-apb0-clock-reset",
 108                 .of_compatible = "allwinner,sun6i-a31-clock-reset",
 109                 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_rstc_res),
 110                 .resources = sun6i_a31_apb0_rstc_res,
 111         },
 112 };
 113
 114 static const struct prcm_data sun6i_a31_prcm_data = {
 115         .nsubdevs = ARRAY_SIZE(sun6i_a31_prcm_subdevs),
 116         .subdevs = sun6i_a31_prcm_subdevs,
 117 };
 118
 119 static const struct prcm_data sun8i_a23_prcm_data = {
 120         .nsubdevs = ARRAY_SIZE(sun8i_a23_prcm_subdevs),
 121         .subdevs = sun8i_a23_prcm_subdevs,
 122 };
 123
 124 static const struct of_device_id sun6i_prcm_dt_ids[] = {
 125         {
 126                 .compatible = "allwinner,sun6i-a31-prcm",
 127                 .data = &sun6i_a31_prcm_data,
 128         },
 129         {
 130                 .compatible = "allwinner,sun8i-a23-prcm",
 131                 .data = &sun8i_a23_prcm_data,
 132         },
 133         { /* sentinel */ },
 134 };
 135
 136 static int sun6i_prcm_probe(struct platform_device *pdev)
 137 {
 138         struct device_node *np = pdev->dev.of_node;
 139         const struct of_device_id *match;
 140         const struct prcm_data *data;
 141         struct resource *res;
 142         int ret;
 143
 144         match = of_match_node(sun6i_prcm_dt_ids, np);
 145         if (!match)
 146                 return -EINVAL;
 147
 148         data = match->data;
 149
 150         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 151         if (!res) {
 152                 dev_err(&pdev->dev, "no prcm memory region provided\n");
 153                 return -ENOENT;
 154         }
 155
 156         ret = mfd_add_devices(&pdev->dev, 0, data->subdevs, data->nsubdevs,
 157                               res, -1, NULL);
 158         if (ret) {
 159                 dev_err(&pdev->dev, "failed to add subdevices\n");
 160                 return ret;
 161         }
 162
 163         return 0;
 164 }
 165
 166 static struct platform_driver sun6i_prcm_driver = {
 167         .driver = {
 168                 .name = "sun6i-prcm",
 169                 .of_match_table = sun6i_prcm_dt_ids,
 170         },
 171         .probe = sun6i_prcm_probe,
 172 };
 173 builtin_platform_driver(sun6i_prcm_driver);