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 #include <asm/io.h>
  16 #include <dm/of_addr.h>
  17 #include <linux/ioport.h>
  18
  19 DECLARE_GLOBAL_DATA_PTR;
  20
  21 static struct regmap *regmap_alloc_count(int count)
  22 {
  23         struct regmap *map;
  24
  25         map = malloc(sizeof(struct regmap));
  26         if (!map)
  27                 return NULL;
  28         if (count <= 1) {
  29                 map->range = &map->base_range;
  30         } else {
  31                 map->range = malloc(count * sizeof(struct regmap_range));
  32                 if (!map->range) {
  33                         free(map);
  34                         return NULL;
  35                 }
  36         }
  37         map->range_count = count;
  38
  39         return map;
  40 }
  41
  42 #if CONFIG_IS_ENABLED(OF_PLATDATA)
  43 int regmap_init_mem_platdata(struct udevice *dev, fdt_val_t *reg, int count,
  44                              struct regmap **mapp)
  45 {
  46         struct regmap_range *range;
  47         struct regmap *map;
  48
  49         map = regmap_alloc_count(count);
  50         if (!map)
  51                 return -ENOMEM;
  52
  53         map->base = *reg;
  54         for (range = map->range; count > 0; reg += 2, range++, count--) {
  55                 range->start = *reg;
  56                 range->size = reg[1];
  57         }
  58
  59         *mapp = map;
  60
  61         return 0;
  62 }
  63 #else
  64 int regmap_init_mem(struct udevice *dev, struct regmap **mapp)
  65 {
  66         struct regmap_range *range;
  67         struct regmap *map;
  68         int count;
  69         int addr_len, size_len, both_len;
  70         int len;
  71         int index;
  72         ofnode node = dev_ofnode(dev);
  73         struct resource r;
  74
  75         addr_len = dev_read_simple_addr_cells(dev->parent);
  76         size_len = dev_read_simple_size_cells(dev->parent);
  77         both_len = addr_len + size_len;
  78
  79         len = dev_read_size(dev, "reg");
  80         if (len < 0)
  81                 return len;
  82         len /= sizeof(fdt32_t);
  83         count = len / both_len;
  84         if (!count)
  85                 return -EINVAL;
  86
  87         map = regmap_alloc_count(count);
  88         if (!map)
  89                 return -ENOMEM;
  90
  91         for (range = map->range, index = 0; count > 0;
  92              count--, range++, index++) {
  93                 fdt_size_t sz;
  94                 if (of_live_active()) {
  95                         of_address_to_resource(ofnode_to_np(node), index, &r);
  96                         range->start = r.start;
  97                         range->size = r.end - r.start + 1;
  98                 } else {
  99                         range->start = fdtdec_get_addr_size_fixed(gd->fdt_blob,
 100                                         dev_of_offset(dev), "reg", index,
 101                                         addr_len, size_len, &sz, true);
 102                         range->size = sz;
 103                 }
 104         }
 105         map->base = map->range[0].start;
 106
 107         *mapp = map;
 108
 109         return 0;
 110 }
 111 #endif
 112
 113 void *regmap_get_range(struct regmap *map, unsigned int range_num)
 114 {
 115         struct regmap_range *range;
 116
 117         if (range_num >= map->range_count)
 118                 return NULL;
 119         range = &map->range[range_num];
 120
 121         return map_sysmem(range->start, range->size);
 122 }
 123
 124 int regmap_uninit(struct regmap *map)
 125 {
 126         if (map->range_count > 1)
 127                 free(map->range);
 128         free(map);
 129
 130         return 0;
 131 }
 132
 133 int regmap_read(struct regmap *map, uint offset, uint *valp)
 134 {
 135         uint32_t *ptr = map_physmem(map->base + offset, 4, MAP_NOCACHE);
 136
 137         *valp = le32_to_cpu(readl(ptr));
 138
 139         return 0;
 140 }
 141
 142 int regmap_write(struct regmap *map, uint offset, uint val)
 143 {
 144         uint32_t *ptr = map_physmem(map->base + offset, 4, MAP_NOCACHE);
 145
 146         writel(cpu_to_le32(val), ptr);
 147
 148         return 0;
 149 }