regmap.c
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/*
* Copyright (c) 2015 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <linux/libfdt.h>
#include <malloc.h>
#include <mapmem.h>
#include <regmap.h>
#include <asm/io.h>
#include <dm/of_addr.h>
#include <linux/ioport.h>
DECLARE_GLOBAL_DATA_PTR;
static struct regmap *regmap_alloc_count(int count)
{
struct regmap *map;
map = malloc(sizeof(struct regmap));
if (!map)
return NULL;
if (count <= 1) {
map->range = &map->base_range;
} else {
map->range = malloc(count * sizeof(struct regmap_range));
if (!map->range) {
free(map);
return NULL;
}
}
map->range_count = count;
return map;
}
#if CONFIG_IS_ENABLED(OF_PLATDATA)
int regmap_init_mem_platdata(struct udevice *dev, fdt_val_t *reg, int count,
struct regmap **mapp)
{
struct regmap_range *range;
struct regmap *map;
map = regmap_alloc_count(count);
if (!map)
return -ENOMEM;
map->base = *reg;
for (range = map->range; count > 0; reg += 2, range++, count--) {
range->start = *reg;
range->size = reg[1];
}
*mapp = map;
return 0;
}
#else
int regmap_init_mem(struct udevice *dev, struct regmap **mapp)
{
struct regmap_range *range;
struct regmap *map;
int count;
int addr_len, size_len, both_len;
int len;
int index;
ofnode node = dev_ofnode(dev);
struct resource r;
addr_len = dev_read_simple_addr_cells(dev->parent);
size_len = dev_read_simple_size_cells(dev->parent);
both_len = addr_len + size_len;
len = dev_read_size(dev, "reg");
if (len < 0)
return len;
len /= sizeof(fdt32_t);
count = len / both_len;
if (!count)
return -EINVAL;
map = regmap_alloc_count(count);
if (!map)
return -ENOMEM;
for (range = map->range, index = 0; count > 0;
count--, range++, index++) {
fdt_size_t sz;
if (of_live_active()) {
of_address_to_resource(ofnode_to_np(node), index, &r);
range->start = r.start;
range->size = r.end - r.start + 1;
} else {
range->start = fdtdec_get_addr_size_fixed(gd->fdt_blob,
dev_of_offset(dev), "reg", index,
addr_len, size_len, &sz, true);
range->size = sz;
}
}
map->base = map->range[0].start;
*mapp = map;
return 0;
}
#endif
void *regmap_get_range(struct regmap *map, unsigned int range_num)
{
struct regmap_range *range;
if (range_num >= map->range_count)
return NULL;
range = &map->range[range_num];
return map_sysmem(range->start, range->size);
}
int regmap_uninit(struct regmap *map)
{
if (map->range_count > 1)
free(map->range);
free(map);
return 0;
}
int regmap_read(struct regmap *map, uint offset, uint *valp)
{
uint32_t *ptr = map_physmem(map->base + offset, 4, MAP_NOCACHE);
*valp = le32_to_cpu(readl(ptr));
return 0;
}
int regmap_write(struct regmap *map, uint offset, uint val)
{
uint32_t *ptr = map_physmem(map->base + offset, 4, MAP_NOCACHE);
writel(cpu_to_le32(val), ptr);
return 0;
}