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u-boot/drivers/core/regmap.c
Simon Glass e21ec17d42 dm: regmap: Disable range checks in SPL 
A recent change to regmap breaks building of phycore-rk3288 for me. The
difference is only a few bytes. Somehow CI seems to pass, even though it
fails when I run docker locally. But it prevents me from sending any more
pull requests.

In any case this board is clearly near the limit. We could revert the
offending change, but it is needed for sandbox tests.

Instead, add a way to drop the range checks in SPL, since they end up
doing nothing if everything is working as expected.

This makes phycore-rk3288 build again for me and reduces the size of SPL
slightly for a number of boards.

Signed-off-by: Simon Glass <sjg@chromium.org>
Fixes: 947d4f132b ("regmap: fix range checks")
2022-10-17 21:17:12 -06:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2015 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*/
#define LOG_CATEGORY LOGC_DM
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <log.h>
#include <asm/global_data.h>
#include <linux/libfdt.h>
#include <malloc.h>
#include <mapmem.h>
#include <regmap.h>
#include <asm/io.h>
#include <dm/of_addr.h>
#include <dm/devres.h>
#include <linux/ioport.h>
#include <linux/compat.h>
#include <linux/err.h>
#include <linux/bitops.h>
/*
* Internal representation of a regmap field. Instead of storing the MSB and
* LSB, store the shift and mask. This makes the code a bit cleaner and faster
* because the shift and mask don't have to be calculated every time.
*/
struct regmap_field {
struct regmap *regmap;
unsigned int mask;
/* lsb */
unsigned int shift;
unsigned int reg;
};
DECLARE_GLOBAL_DATA_PTR;
/**
* do_range_check() - Control whether range checks are done
*
* Returns: true to do range checks, false to skip
*
* This is used to reduce code size on SPL where range checks are known not to
* be needed
*
* Add this to the top of the file to enable them: #define LOG_DEBUG
*/
static inline bool do_range_check(void)
{
return _LOG_DEBUG || !IS_ENABLED(CONFIG_SPL);
}
/**
* regmap_alloc() - Allocate a regmap with a given number of ranges.
*
* @count: Number of ranges to be allocated for the regmap.
*
* The default regmap width is set to REGMAP_SIZE_32. Callers can override it
* if they need.
*
* Return: A pointer to the newly allocated regmap, or NULL on error.
*/
static struct regmap *regmap_alloc(int count)
{
struct regmap *map;
size_t size = sizeof(*map) + sizeof(map->ranges[0]) * count;
map = calloc(1, size);
if (!map)
return NULL;
map->range_count = count;
map->width = REGMAP_SIZE_32;
return map;
}
#if CONFIG_IS_ENABLED(OF_PLATDATA)
int regmap_init_mem_plat(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_index(ofnode node, struct regmap **mapp, int index)
{
struct regmap *map;
int addr_len, size_len;
int ret;
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;
}
map = regmap_alloc(1);
if (!map)
return -ENOMEM;
ret = init_range(node, map->ranges, addr_len, size_len, index);
if (ret)
goto err;
if (ofnode_read_bool(node, "little-endian"))
map->endianness = REGMAP_LITTLE_ENDIAN;
else if (ofnode_read_bool(node, "big-endian"))
map->endianness = REGMAP_BIG_ENDIAN;
else if (ofnode_read_bool(node, "native-endian"))
map->endianness = REGMAP_NATIVE_ENDIAN;
else /* Default: native endianness */
map->endianness = REGMAP_NATIVE_ENDIAN;
*mapp = map;
return 0;
err:
regmap_uninit(map);
return ret;
}
int regmap_init_mem_range(ofnode node, ulong r_start, ulong r_size,
struct regmap **mapp)
{
struct regmap *map;
struct regmap_range *range;
map = regmap_alloc(1);
if (!map)
return -ENOMEM;
range = &map->ranges[0];
range->start = r_start;
range->size = r_size;
if (ofnode_read_bool(node, "little-endian"))
map->endianness = REGMAP_LITTLE_ENDIAN;
else if (ofnode_read_bool(node, "big-endian"))
map->endianness = REGMAP_BIG_ENDIAN;
else if (ofnode_read_bool(node, "native-endian"))
map->endianness = REGMAP_NATIVE_ENDIAN;
else /* Default: native endianness */
map->endianness = REGMAP_NATIVE_ENDIAN;
*mapp = map;
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;
int ret;
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) {
debug("%s: Error while reading reg size (ret = %d)\n",
ofnode_get_name(node), len);
return len;
}
len /= sizeof(fdt32_t);
count = len / both_len;
if (!count) {
debug("%s: Not enough data in reg property\n",
ofnode_get_name(node));
return -EINVAL;
}
map = regmap_alloc(count);
if (!map)
return -ENOMEM;
for (range = map->ranges, index = 0; count > 0;
count--, range++, index++) {
ret = init_range(node, range, addr_len, size_len, index);
if (ret)
goto err;
}
if (ofnode_read_bool(node, "little-endian"))
map->endianness = REGMAP_LITTLE_ENDIAN;
else if (ofnode_read_bool(node, "big-endian"))
map->endianness = REGMAP_BIG_ENDIAN;
else if (ofnode_read_bool(node, "native-endian"))
map->endianness = REGMAP_NATIVE_ENDIAN;
else /* Default: native endianness */
map->endianness = REGMAP_NATIVE_ENDIAN;
*mapp = map;
return 0;
err:
regmap_uninit(map);
return ret;
}
static void devm_regmap_release(struct udevice *dev, void *res)
{
regmap_uninit(*(struct regmap **)res);
}
struct regmap *devm_regmap_init(struct udevice *dev,
const struct regmap_bus *bus,
void *bus_context,
const struct regmap_config *config)
{
int rc;
struct regmap **mapp, *map;
/* this looks like a leak, but devres takes care of it */
mapp = devres_alloc(devm_regmap_release, sizeof(struct regmap *),
__GFP_ZERO);
if (unlikely(!mapp))
return ERR_PTR(-ENOMEM);
if (config && config->r_size != 0)
rc = regmap_init_mem_range(dev_ofnode(dev), config->r_start,
config->r_size, mapp);
else
rc = regmap_init_mem(dev_ofnode(dev), mapp);
if (rc)
return ERR_PTR(rc);
map = *mapp;
if (config) {
map->width = config->width;
map->reg_offset_shift = config->reg_offset_shift;
}
devres_add(dev, mapp);
return *mapp;
}
#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;
}
static inline u8 __read_8(u8 *addr, enum regmap_endianness_t endianness)
{
return readb(addr);
}
static inline u16 __read_16(u16 *addr, enum regmap_endianness_t endianness)
{
switch (endianness) {
case REGMAP_LITTLE_ENDIAN:
return in_le16(addr);
case REGMAP_BIG_ENDIAN:
return in_be16(addr);
case REGMAP_NATIVE_ENDIAN:
return readw(addr);
}
return readw(addr);
}
static inline u32 __read_32(u32 *addr, enum regmap_endianness_t endianness)
{
switch (endianness) {
case REGMAP_LITTLE_ENDIAN:
return in_le32(addr);
case REGMAP_BIG_ENDIAN:
return in_be32(addr);
case REGMAP_NATIVE_ENDIAN:
return readl(addr);
}
return readl(addr);
}
#if defined(in_le64) && defined(in_be64) && defined(readq)
static inline u64 __read_64(u64 *addr, enum regmap_endianness_t endianness)
{
switch (endianness) {
case REGMAP_LITTLE_ENDIAN:
return in_le64(addr);
case REGMAP_BIG_ENDIAN:
return in_be64(addr);
case REGMAP_NATIVE_ENDIAN:
return readq(addr);
}
return readq(addr);
}
#endif
int regmap_raw_read_range(struct regmap *map, uint range_num, uint offset,
void *valp, size_t val_len)
{
struct regmap_range *range;
void *ptr;
if (do_range_check() && range_num >= map->range_count) {
debug("%s: range index %d larger than range count\n",
__func__, range_num);
return -ERANGE;
}
range = &map->ranges[range_num];
offset <<= map->reg_offset_shift;
if (do_range_check() &&
(offset + val_len > range->size || offset + val_len < offset)) {
debug("%s: offset/size combination invalid\n", __func__);
return -ERANGE;
}
ptr = map_physmem(range->start + offset, val_len, MAP_NOCACHE);
switch (val_len) {
case REGMAP_SIZE_8:
*((u8 *)valp) = __read_8(ptr, map->endianness);
break;
case REGMAP_SIZE_16:
*((u16 *)valp) = __read_16(ptr, map->endianness);
break;
case REGMAP_SIZE_32:
*((u32 *)valp) = __read_32(ptr, map->endianness);
break;
#if defined(in_le64) && defined(in_be64) && defined(readq)
case REGMAP_SIZE_64:
*((u64 *)valp) = __read_64(ptr, map->endianness);
break;
#endif
default:
debug("%s: regmap size %zu unknown\n", __func__, val_len);
return -EINVAL;
}
return 0;
}
int regmap_raw_read(struct regmap *map, uint offset, void *valp, size_t val_len)
{
return regmap_raw_read_range(map, 0, offset, valp, val_len);
}
int regmap_read(struct regmap *map, uint offset, uint *valp)
{
union {
u8 v8;
u16 v16;
u32 v32;
u64 v64;
} u;
int res;
res = regmap_raw_read(map, offset, &u, map->width);
if (res)
return res;
switch (map->width) {
case REGMAP_SIZE_8:
*valp = u.v8;
break;
case REGMAP_SIZE_16:
*valp = u.v16;
break;
case REGMAP_SIZE_32:
*valp = u.v32;
break;
case REGMAP_SIZE_64:
*valp = u.v64;
break;
default:
unreachable();
}
return 0;
}
static inline void __write_8(u8 *addr, const u8 *val,
enum regmap_endianness_t endianness)
{
writeb(*val, addr);
}
static inline void __write_16(u16 *addr, const u16 *val,
enum regmap_endianness_t endianness)
{
switch (endianness) {
case REGMAP_NATIVE_ENDIAN:
writew(*val, addr);
break;
case REGMAP_LITTLE_ENDIAN:
out_le16(addr, *val);
break;
case REGMAP_BIG_ENDIAN:
out_be16(addr, *val);
break;
}
}
static inline void __write_32(u32 *addr, const u32 *val,
enum regmap_endianness_t endianness)
{
switch (endianness) {
case REGMAP_NATIVE_ENDIAN:
writel(*val, addr);
break;
case REGMAP_LITTLE_ENDIAN:
out_le32(addr, *val);
break;
case REGMAP_BIG_ENDIAN:
out_be32(addr, *val);
break;
}
}
#if defined(out_le64) && defined(out_be64) && defined(writeq)
static inline void __write_64(u64 *addr, const u64 *val,
enum regmap_endianness_t endianness)
{
switch (endianness) {
case REGMAP_NATIVE_ENDIAN:
writeq(*val, addr);
break;
case REGMAP_LITTLE_ENDIAN:
out_le64(addr, *val);
break;
case REGMAP_BIG_ENDIAN:
out_be64(addr, *val);
break;
}
}
#endif
int regmap_raw_write_range(struct regmap *map, uint range_num, uint offset,
const void *val, size_t val_len)
{
struct regmap_range *range;
void *ptr;
if (range_num >= map->range_count) {
debug("%s: range index %d larger than range count\n",
__func__, range_num);
return -ERANGE;
}
range = &map->ranges[range_num];
offset <<= map->reg_offset_shift;
if (offset + val_len > range->size || offset + val_len < offset) {
debug("%s: offset/size combination invalid\n", __func__);
return -ERANGE;
}
ptr = map_physmem(range->start + offset, val_len, MAP_NOCACHE);
switch (val_len) {
case REGMAP_SIZE_8:
__write_8(ptr, val, map->endianness);
break;
case REGMAP_SIZE_16:
__write_16(ptr, val, map->endianness);
break;
case REGMAP_SIZE_32:
__write_32(ptr, val, map->endianness);
break;
#if defined(out_le64) && defined(out_be64) && defined(writeq)
case REGMAP_SIZE_64:
__write_64(ptr, val, map->endianness);
break;
#endif
default:
debug("%s: regmap size %zu unknown\n", __func__, val_len);
return -EINVAL;
}
return 0;
}
int regmap_raw_write(struct regmap *map, uint offset, const void *val,
size_t val_len)
{
return regmap_raw_write_range(map, 0, offset, val, val_len);
}
int regmap_write(struct regmap *map, uint offset, uint val)
{
union {
u8 v8;
u16 v16;
u32 v32;
u64 v64;
} u;
switch (map->width) {
case REGMAP_SIZE_8:
u.v8 = val;
break;
case REGMAP_SIZE_16:
u.v16 = val;
break;
case REGMAP_SIZE_32:
u.v32 = val;
break;
case REGMAP_SIZE_64:
u.v64 = val;
break;
default:
debug("%s: regmap size %zu unknown\n", __func__,
(size_t)map->width);
return -EINVAL;
}
return regmap_raw_write(map, offset, &u, map->width);
}
int regmap_update_bits(struct regmap *map, uint offset, uint mask, uint val)
{
uint reg;
int ret;
ret = regmap_read(map, offset, &reg);
if (ret)
return ret;
reg &= ~mask;
return regmap_write(map, offset, reg | (val & mask));
}
int regmap_field_read(struct regmap_field *field, unsigned int *val)
{
int ret;
unsigned int reg_val;
ret = regmap_read(field->regmap, field->reg, &reg_val);
if (ret != 0)
return ret;
reg_val &= field->mask;
reg_val >>= field->shift;
*val = reg_val;
return ret;
}
int regmap_field_write(struct regmap_field *field, unsigned int val)
{
return regmap_update_bits(field->regmap, field->reg, field->mask,
val << field->shift);
}
static void regmap_field_init(struct regmap_field *rm_field,
struct regmap *regmap,
struct reg_field reg_field)
{
rm_field->regmap = regmap;
rm_field->reg = reg_field.reg;
rm_field->shift = reg_field.lsb;
rm_field->mask = GENMASK(reg_field.msb, reg_field.lsb);
}
struct regmap_field *devm_regmap_field_alloc(struct udevice *dev,
struct regmap *regmap,
struct reg_field reg_field)
{
struct regmap_field *rm_field = devm_kzalloc(dev, sizeof(*rm_field),
GFP_KERNEL);
if (!rm_field)
return ERR_PTR(-ENOMEM);
regmap_field_init(rm_field, regmap, reg_field);
return rm_field;
}
void devm_regmap_field_free(struct udevice *dev, struct regmap_field *field)
{
devm_kfree(dev, field);
}
struct regmap_field *regmap_field_alloc(struct regmap *regmap,
struct reg_field reg_field)
{
struct regmap_field *rm_field = kzalloc(sizeof(*rm_field), GFP_KERNEL);
if (!rm_field)
return ERR_PTR(-ENOMEM);
regmap_field_init(rm_field, regmap, reg_field);
return rm_field;
}
void regmap_field_free(struct regmap_field *field)
{
kfree(field);
}
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