mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-05 02:51:00 +00:00
285cbcf97f
Add the regmap_update_bits() to simply the read/modify/write of registers in a single command. The function is taken from Linux regmap implementation. Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Reviewed-by: Simon Glass <sjg@chromium.org>
148 lines
2.8 KiB
C
148 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (c) 2015 Google, Inc
|
|
* Written by Simon Glass <sjg@chromium.org>
|
|
*/
|
|
|
|
#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(int count)
|
|
{
|
|
struct regmap *map;
|
|
|
|
map = malloc(sizeof(*map) + sizeof(map->ranges[0]) * count);
|
|
if (!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);
|
|
if (!map)
|
|
return -ENOMEM;
|
|
|
|
for (range = map->ranges; count > 0; reg += 2, range++, count--) {
|
|
range->start = *reg;
|
|
range->size = reg[1];
|
|
}
|
|
|
|
*mapp = map;
|
|
|
|
return 0;
|
|
}
|
|
#else
|
|
int regmap_init_mem(ofnode node, struct regmap **mapp)
|
|
{
|
|
struct regmap_range *range;
|
|
struct regmap *map;
|
|
int count;
|
|
int addr_len, size_len, both_len;
|
|
int len;
|
|
int index;
|
|
struct resource r;
|
|
|
|
addr_len = ofnode_read_simple_addr_cells(ofnode_get_parent(node));
|
|
size_len = ofnode_read_simple_size_cells(ofnode_get_parent(node));
|
|
both_len = addr_len + size_len;
|
|
|
|
len = ofnode_read_size(node, "reg");
|
|
if (len < 0)
|
|
return len;
|
|
len /= sizeof(fdt32_t);
|
|
count = len / both_len;
|
|
if (!count)
|
|
return -EINVAL;
|
|
|
|
map = regmap_alloc(count);
|
|
if (!map)
|
|
return -ENOMEM;
|
|
|
|
for (range = map->ranges, 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,
|
|
ofnode_to_offset(node), "reg", index,
|
|
addr_len, size_len, &sz, true);
|
|
range->size = sz;
|
|
}
|
|
}
|
|
|
|
*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->ranges[range_num];
|
|
|
|
return map_sysmem(range->start, range->size);
|
|
}
|
|
|
|
int regmap_uninit(struct regmap *map)
|
|
{
|
|
free(map);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int regmap_read(struct regmap *map, uint offset, uint *valp)
|
|
{
|
|
u32 *ptr = map_physmem(map->ranges[0].start + offset, 4, MAP_NOCACHE);
|
|
|
|
*valp = le32_to_cpu(readl(ptr));
|
|
|
|
return 0;
|
|
}
|
|
|
|
int regmap_write(struct regmap *map, uint offset, uint val)
|
|
{
|
|
u32 *ptr = map_physmem(map->ranges[0].start + offset, 4, MAP_NOCACHE);
|
|
|
|
writel(cpu_to_le32(val), ptr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int regmap_update_bits(struct regmap *map, uint offset, uint mask, uint val)
|
|
{
|
|
uint reg;
|
|
int ret;
|
|
|
|
ret = regmap_read(map, offset, ®);
|
|
if (ret)
|
|
return ret;
|
|
|
|
reg &= ~mask;
|
|
|
|
return regmap_write(map, offset, reg | val);
|
|
}
|