drivers/clk/at91/pmc.c

   1 /*
   2  * Copyright (C) 2016 Atmel Corporation
   3  *               Wenyou.Yang <wenyou.yang@atmel.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <clk-uclass.h>
  10 #include <dm/device.h>
  11 #include <dm/lists.h>
  12 #include <dm/root.h>
  13 #include <dm/util.h>
  14 #include "pmc.h"
  15
  16 DECLARE_GLOBAL_DATA_PTR;
  17
  18 static const struct udevice_id at91_pmc_match[] = {
  19         { .compatible = "atmel,at91rm9200-pmc" },
  20         { .compatible = "atmel,at91sam9260-pmc" },
  21         { .compatible = "atmel,at91sam9g45-pmc" },
  22         { .compatible = "atmel,at91sam9n12-pmc" },
  23         { .compatible = "atmel,at91sam9x5-pmc" },
  24         { .compatible = "atmel,sama5d3-pmc" },
  25         { .compatible = "atmel,sama5d2-pmc" },
  26         {}
  27 };
  28
  29 U_BOOT_DRIVER(at91_pmc) = {
  30         .name = "at91-pmc",
  31         .id = UCLASS_SIMPLE_BUS,
  32         .of_match = at91_pmc_match,
  33 };
  34
  35 /*---------------------------------------------------------*/
  36
  37 int at91_pmc_core_probe(struct udevice *dev)
  38 {
  39         struct pmc_platdata *plat = dev_get_platdata(dev);
  40
  41         dev = dev_get_parent(dev);
  42
  43         plat->reg_base = (struct at91_pmc *)dev_get_addr_ptr(dev);
  44
  45         return 0;
  46 }
  47
  48 /**
  49  * at91_clk_sub_device_bind() - for the at91 clock driver
  50  * Recursively bind its children as clk devices.
  51  *
  52  * @return: 0 on success, or negative error code on failure
  53  */
  54 int at91_clk_sub_device_bind(struct udevice *dev, const char *drv_name)
  55 {
  56         const void *fdt = gd->fdt_blob;
  57         int offset = dev_of_offset(dev);
  58         bool pre_reloc_only = !(gd->flags & GD_FLG_RELOC);
  59         const char *name;
  60         int ret;
  61
  62         for (offset = fdt_first_subnode(fdt, offset);
  63              offset > 0;
  64              offset = fdt_next_subnode(fdt, offset)) {
  65                 if (pre_reloc_only &&
  66                     !dm_fdt_pre_reloc(fdt, offset))
  67                         continue;
  68                 /*
  69                  * If this node has "compatible" property, this is not
  70                  * a clock sub-node, but a normal device. skip.
  71                  */
  72                 fdt_get_property(fdt, offset, "compatible", &ret);
  73                 if (ret >= 0)
  74                         continue;
  75
  76                 if (ret != -FDT_ERR_NOTFOUND)
  77                         return ret;
  78
  79                 name = fdt_get_name(fdt, offset, NULL);
  80                 if (!name)
  81                         return -EINVAL;
  82                 ret = device_bind_driver_to_node(dev, drv_name, name,
  83                                                  offset, NULL);
  84                 if (ret)
  85                         return ret;
  86         }
  87
  88         return 0;
  89 }
  90
  91 int at91_clk_of_xlate(struct clk *clk, struct fdtdec_phandle_args *args)
  92 {
  93         int periph;
  94
  95         if (args->args_count) {
  96                 debug("Invalid args_count: %d\n", args->args_count);
  97                 return -EINVAL;
  98         }
  99
 100         periph = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(clk->dev), "reg",
 101                                  -1);
 102         if (periph < 0)
 103                 return -EINVAL;
 104
 105         clk->id = periph;
 106
 107         return 0;
 108 }
 109
 110 int at91_clk_probe(struct udevice *dev)
 111 {
 112         struct udevice *dev_periph_container, *dev_pmc;
 113         struct pmc_platdata *plat = dev_get_platdata(dev);
 114
 115         dev_periph_container = dev_get_parent(dev);
 116         dev_pmc = dev_get_parent(dev_periph_container);
 117
 118         plat->reg_base = (struct at91_pmc *)dev_get_addr_ptr(dev_pmc);
 119
 120         return 0;
 121 }