drivers/core/regmap.c

   1 /*
   2  * Copyright (c) 2015 Google, Inc
   3  * Written by Simon Glass <sjg@chromium.org>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <dm.h>
  10 #include <errno.h>
  11 #include <libfdt.h>
  12 #include <malloc.h>
  13 #include <mapmem.h>
  14 #include <regmap.h>
  15
  16 #include <asm/io.h>
  17
  18 DECLARE_GLOBAL_DATA_PTR;
  19
  20 static struct regmap *regmap_alloc_count(int count)
  21 {
  22         struct regmap *map;
  23
  24         map = malloc(sizeof(struct regmap));
  25         if (!map)
  26                 return NULL;
  27         if (count <= 1) {
  28                 map->range = &map->base_range;
  29         } else {
  30                 map->range = malloc(count * sizeof(struct regmap_range));
  31                 if (!map->range) {
  32                         free(map);
  33                         return NULL;
  34                 }
  35         }
  36         map->range_count = count;
  37
  38         return map;
  39 }
  40
  41 #if CONFIG_IS_ENABLED(OF_PLATDATA)
  42 int regmap_init_mem_platdata(struct udevice *dev, u32 *reg, int count,
  43                              struct regmap **mapp)
  44 {
  45         struct regmap_range *range;
  46         struct regmap *map;
  47
  48         map = regmap_alloc_count(count);
  49         if (!map)
  50                 return -ENOMEM;
  51
  52         map->base = *reg;
  53         for (range = map->range; count > 0; reg += 2, range++, count--) {
  54                 range->start = *reg;
  55                 range->size = reg[1];
  56         }
  57
  58         *mapp = map;
  59
  60         return 0;
  61 }
  62 #else
  63 int regmap_init_mem(struct udevice *dev, struct regmap **mapp)
  64 {
  65         const void *blob = gd->fdt_blob;
  66         struct regmap_range *range;
  67         const fdt32_t *cell;
  68         struct regmap *map;
  69         int count;
  70         int addr_len, size_len, both_len;
  71         int parent;
  72         int len;
  73         int index;
  74
  75         parent = dev_of_offset(dev->parent);
  76         addr_len = fdt_address_cells(blob, parent);
  77         size_len = fdt_size_cells(blob, parent);
  78         both_len = addr_len + size_len;
  79
  80         cell = fdt_getprop(blob, dev_of_offset(dev), "reg", &len);
  81         len /= sizeof(*cell);
  82         count = len / both_len;
  83         if (!cell || !count)
  84                 return -EINVAL;
  85
  86         map = regmap_alloc_count(count);
  87         if (!map)
  88                 return -ENOMEM;
  89
  90         for (range = map->range, index = 0; count > 0;
  91              count--, cell += both_len, range++, index++) {
  92                 fdt_size_t sz;
  93                 range->start = fdtdec_get_addr_size_fixed(blob, dev->of_offset,
  94                                 "reg", index, addr_len, size_len, &sz, true);
  95                 range->size = sz;
  96         }
  97         map->base = map->range[0].start;
  98
  99         *mapp = map;
 100
 101         return 0;
 102 }
 103 #endif
 104
 105 void *regmap_get_range(struct regmap *map, unsigned int range_num)
 106 {
 107         struct regmap_range *range;
 108
 109         if (range_num >= map->range_count)
 110                 return NULL;
 111         range = &map->range[range_num];
 112
 113         return map_sysmem(range->start, range->size);
 114 }
 115
 116 int regmap_uninit(struct regmap *map)
 117 {
 118         if (map->range_count > 1)
 119                 free(map->range);
 120         free(map);
 121
 122         return 0;
 123 }
 124
 125 int regmap_read(struct regmap *map, uint offset, uint *valp)
 126 {
 127         uint32_t *ptr = map_physmem(map->base + offset, 4, MAP_NOCACHE);
 128
 129         *valp = le32_to_cpu(readl(ptr));
 130
 131         return 0;
 132 }
 133
 134 int regmap_write(struct regmap *map, uint offset, uint val)
 135 {
 136         uint32_t *ptr = map_physmem(map->base + offset, 4, MAP_NOCACHE);
 137
 138         writel(cpu_to_le32(val), ptr);
 139
 140         return 0;
 141 }