u-boot/drivers/core/regmap.c
Jean-Jacques Hiblot 1804044f30 regmap: use fdt address translation
In the DTS, the addresses are defined relative to the parent bus. We need
to translate them to get the address as seen by the CPU core.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
2017-03-22 07:27:19 -06:00

141 lines
2.7 KiB
C

/*
* 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 <libfdt.h>
#include <malloc.h>
#include <mapmem.h>
#include <regmap.h>
#include <asm/io.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, u32 *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)
{
const void *blob = gd->fdt_blob;
struct regmap_range *range;
const fdt32_t *cell;
struct regmap *map;
int count;
int addr_len, size_len, both_len;
int parent;
int len;
int index;
parent = dev_of_offset(dev->parent);
addr_len = fdt_address_cells(blob, parent);
size_len = fdt_size_cells(blob, parent);
both_len = addr_len + size_len;
cell = fdt_getprop(blob, dev_of_offset(dev), "reg", &len);
len /= sizeof(*cell);
count = len / both_len;
if (!cell || !count)
return -EINVAL;
map = regmap_alloc_count(count);
if (!map)
return -ENOMEM;
for (range = map->range, index = 0; count > 0;
count--, cell += both_len, range++, index++) {
fdt_size_t sz;
range->start = fdtdec_get_addr_size_fixed(blob, dev->of_offset,
"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;
}