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https://github.com/AsahiLinux/u-boot
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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+
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/*
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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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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <linux/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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#include <dm/of_addr.h>
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#include <linux/ioport.h>
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DECLARE_GLOBAL_DATA_PTR;
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static struct regmap *regmap_alloc(int count)
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{
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struct regmap *map;
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map = malloc(sizeof(*map) + sizeof(map->ranges[0]) * count);
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if (!map)
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return NULL;
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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, fdt_val_t *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);
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if (!map)
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return -ENOMEM;
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for (range = map->ranges; 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(ofnode node, 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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int count;
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int addr_len, size_len, both_len;
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int len;
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int index;
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struct resource r;
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addr_len = ofnode_read_simple_addr_cells(ofnode_get_parent(node));
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size_len = ofnode_read_simple_size_cells(ofnode_get_parent(node));
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both_len = addr_len + size_len;
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len = ofnode_read_size(node, "reg");
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if (len < 0)
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return len;
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len /= sizeof(fdt32_t);
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count = len / both_len;
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if (!count)
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return -EINVAL;
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map = regmap_alloc(count);
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if (!map)
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return -ENOMEM;
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for (range = map->ranges, index = 0; count > 0;
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count--, range++, index++) {
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fdt_size_t sz;
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if (of_live_active()) {
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of_address_to_resource(ofnode_to_np(node), index, &r);
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range->start = r.start;
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range->size = r.end - r.start + 1;
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} else {
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range->start = fdtdec_get_addr_size_fixed(gd->fdt_blob,
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ofnode_to_offset(node), "reg", index,
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addr_len, size_len, &sz, true);
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range->size = sz;
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}
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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->ranges[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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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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u32 *ptr = map_physmem(map->ranges[0].start + 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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u32 *ptr = map_physmem(map->ranges[0].start + 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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int regmap_update_bits(struct regmap *map, uint offset, uint mask, uint val)
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{
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uint reg;
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int ret;
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ret = regmap_read(map, offset, ®);
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if (ret)
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return ret;
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reg &= ~mask;
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return regmap_write(map, offset, reg | val);
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}
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