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https://github.com/AsahiLinux/u-boot
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3bfb8cb43b
The regmap_read & regmap_write functions were previously declared in
regmap.h but not implemented anywhere. The regmap implementation &
commit message of 6f98b7504f ("dm: Add support for register maps
(regmap)") indicate that only memory mapped accesses are supported for
now, so providing simple implementations of regmap_read & regmap_write
is trivial. The access size is presumed to be 4 bytes & endianness is
presumed native, which are the defaults for the regmap code in Linux.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
139 lines
2.6 KiB
C
139 lines
2.6 KiB
C
/*
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* Copyright (c) 2015 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <libfdt.h>
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#include <malloc.h>
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#include <mapmem.h>
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#include <regmap.h>
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#include <asm/io.h>
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DECLARE_GLOBAL_DATA_PTR;
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static struct regmap *regmap_alloc_count(int count)
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{
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struct regmap *map;
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map = malloc(sizeof(struct regmap));
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if (!map)
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return NULL;
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if (count <= 1) {
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map->range = &map->base_range;
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} else {
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map->range = malloc(count * sizeof(struct regmap_range));
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if (!map->range) {
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free(map);
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return NULL;
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}
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}
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map->range_count = count;
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return map;
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}
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#if CONFIG_IS_ENABLED(OF_PLATDATA)
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int regmap_init_mem_platdata(struct udevice *dev, u32 *reg, int count,
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struct regmap **mapp)
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{
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struct regmap_range *range;
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struct regmap *map;
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map = regmap_alloc_count(count);
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if (!map)
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return -ENOMEM;
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map->base = *reg;
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for (range = map->range; count > 0; reg += 2, range++, count--) {
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range->start = *reg;
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range->size = reg[1];
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}
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*mapp = map;
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return 0;
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}
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#else
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int regmap_init_mem(struct udevice *dev, struct regmap **mapp)
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{
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const void *blob = gd->fdt_blob;
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struct regmap_range *range;
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const fdt32_t *cell;
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struct regmap *map;
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int count;
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int addr_len, size_len, both_len;
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int parent;
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int len;
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parent = dev->parent->of_offset;
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addr_len = fdt_address_cells(blob, parent);
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size_len = fdt_size_cells(blob, parent);
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both_len = addr_len + size_len;
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cell = fdt_getprop(blob, dev->of_offset, "reg", &len);
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len /= sizeof(*cell);
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count = len / both_len;
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if (!cell || !count)
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return -EINVAL;
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map = regmap_alloc_count(count);
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if (!map)
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return -ENOMEM;
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map->base = fdtdec_get_number(cell, addr_len);
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for (range = map->range; count > 0;
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count--, cell += both_len, range++) {
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range->start = fdtdec_get_number(cell, addr_len);
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range->size = fdtdec_get_number(cell + addr_len, size_len);
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}
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*mapp = map;
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return 0;
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}
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#endif
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void *regmap_get_range(struct regmap *map, unsigned int range_num)
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{
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struct regmap_range *range;
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if (range_num >= map->range_count)
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return NULL;
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range = &map->range[range_num];
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return map_sysmem(range->start, range->size);
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}
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int regmap_uninit(struct regmap *map)
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{
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if (map->range_count > 1)
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free(map->range);
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free(map);
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return 0;
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}
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int regmap_read(struct regmap *map, uint offset, uint *valp)
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{
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uint32_t *ptr = map_physmem(map->base + offset, 4, MAP_NOCACHE);
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*valp = le32_to_cpu(readl(ptr));
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return 0;
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}
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int regmap_write(struct regmap *map, uint offset, uint val)
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{
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uint32_t *ptr = map_physmem(map->base + offset, 4, MAP_NOCACHE);
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writel(cpu_to_le32(val), ptr);
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return 0;
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}
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