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// 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;
/**
* regmap_alloc() - Allocate a regmap with a given number of ranges.
*
* @count: Number of ranges to be allocated for the regmap.
* Return: A pointer to the newly allocated regmap, or NULL on error.
*/
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
/**
* init_range() - Initialize a single range of a regmap
* @node: Device node that will use the map in question
* @range: Pointer to a regmap_range structure that will be initialized
* @addr_len: The length of the addr parts of the reg property
* @size_len: The length of the size parts of the reg property
* @index: The index of the range to initialize
*
* This function will read the necessary 'reg' information from the device tree
* (the 'addr' part, and the 'length' part), and initialize the range in
* quesion.
*
* Return: 0 if OK, -ve on error
*/
static int init_range(ofnode node, struct regmap_range *range, int addr_len,
int size_len, int index)
{
fdt_size_t sz;
struct resource r;
if (of_live_active()) {
int ret;
ret = of_address_to_resource(ofnode_to_np(node),
index, &r);
if (ret) {
debug("%s: Could not read resource of range %d (ret = %d)\n",
ofnode_get_name(node), index, ret);
return ret;
}
range->start = r.start;
range->size = r.end - r.start + 1;
} else {
int offset = ofnode_to_offset(node);
range->start = fdtdec_get_addr_size_fixed(gd->fdt_blob, offset,
"reg", index,
addr_len, size_len,
&sz, true);
if (range->start == FDT_ADDR_T_NONE) {
debug("%s: Could not read start of range %d\n",
ofnode_get_name(node), index);
return -EINVAL;
}
range->size = sz;
}
return 0;
}
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;
addr_len = ofnode_read_simple_addr_cells(ofnode_get_parent(node));
if (addr_len < 0) {
debug("%s: Error while reading the addr length (ret = %d)\n",
ofnode_get_name(node), addr_len);
return addr_len;
}
size_len = ofnode_read_simple_size_cells(ofnode_get_parent(node));
if (size_len < 0) {
debug("%s: Error while reading the size length: (ret = %d)\n",
ofnode_get_name(node), size_len);
return size_len;
}
both_len = addr_len + size_len;
if (!both_len) {
debug("%s: Both addr and size length are zero\n",
ofnode_get_name(node));
return -EINVAL;
}
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++) {
int ret = init_range(node, range, addr_len, size_len, index);
if (ret)
return ret;
}
*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);
}
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