#include <linux/of.h>
#include <linux/of_net.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/nvmem-consumer.h>
#include <linux/etherdevice.h>
#include "mt76.h"
static int mt76_get_of_eeprom_data(struct mt76_dev *dev, void *eep, int len)
{
struct device_node *np = dev->dev->of_node;
const void *data;
int size;
data = of_get_property(np, "mediatek,eeprom-data", &size);
if (!data)
return -ENOENT;
if (size > len)
return -EINVAL;
memcpy(eep, data, size);
return 0;
}
static int mt76_get_of_epprom_from_mtd(struct mt76_dev *dev, void *eep, int offset, int len)
{
#ifdef CONFIG_MTD
struct device_node *np = dev->dev->of_node;
struct mtd_info *mtd;
const __be32 *list;
const char *part;
phandle phandle;
size_t retlen;
int size;
int ret;
list = of_get_property(np, "mediatek,mtd-eeprom", &size);
if (!list)
return -ENOENT;
phandle = be32_to_cpup(list++);
if (!phandle)
return -ENOENT;
np = of_find_node_by_phandle(phandle);
if (!np)
return -EINVAL;
part = of_get_property(np, "label", NULL);
if (!part)
part = np->name;
mtd = get_mtd_device_nm(part);
if (IS_ERR(mtd)) {
ret = PTR_ERR(mtd);
goto out_put_node;
}
if (size <= sizeof(*list)) {
ret = -EINVAL;
goto out_put_node;
}
offset = be32_to_cpup(list);
ret = mtd_read(mtd, offset, len, &retlen, eep);
put_mtd_device(mtd);
if (mtd_is_bitflip(ret))
ret = 0;
if (ret) {
dev_err(dev->dev, "reading EEPROM from mtd %s failed: %i\n",
part, ret);
goto out_put_node;
}
if (retlen < len) {
ret = -EINVAL;
goto out_put_node;
}
if (of_property_read_bool(dev->dev->of_node, "big-endian")) {
u8 *data = (u8 *)eep;
int i;
for (i = 0; i < round_down(len, 2); i += 2)
put_unaligned_le16(get_unaligned_be16(&data[i]),
&data[i]);
}
#ifdef CONFIG_NL80211_TESTMODE
dev->test_mtd.name = devm_kstrdup(dev->dev, part, GFP_KERNEL);
dev->test_mtd.offset = offset;
#endif
out_put_node:
of_node_put(np);
return ret;
#else
return -ENOENT;
#endif
}
static int mt76_get_of_epprom_from_nvmem(struct mt76_dev *dev, void *eep, int len)
{
struct device_node *np = dev->dev->of_node;
struct nvmem_cell *cell;
const void *data;
size_t retlen;
int ret = 0;
cell = of_nvmem_cell_get(np, "eeprom");
if (IS_ERR(cell))
return PTR_ERR(cell);
data = nvmem_cell_read(cell, &retlen);
nvmem_cell_put(cell);
if (IS_ERR(data))
return PTR_ERR(data);
if (retlen < len) {
ret = -EINVAL;
goto exit;
}
memcpy(eep, data, len);
exit:
kfree(data);
return ret;
}
int mt76_get_of_eeprom(struct mt76_dev *dev, void *eep, int offset, int len)
{
struct device_node *np = dev->dev->of_node;
int ret;
if (!np)
return -ENOENT;
ret = mt76_get_of_eeprom_data(dev, eep, len);
if (!ret)
return 0;
ret = mt76_get_of_epprom_from_mtd(dev, eep, offset, len);
if (!ret)
return 0;
return mt76_get_of_epprom_from_nvmem(dev, eep, len);
}
EXPORT_SYMBOL_GPL(mt76_get_of_eeprom);
void
mt76_eeprom_override(struct mt76_phy *phy)
{
struct mt76_dev *dev = phy->dev;
struct device_node *np = dev->dev->of_node;
of_get_mac_address(np, phy->macaddr);
if (!is_valid_ether_addr(phy->macaddr)) {
eth_random_addr(phy->macaddr);
dev_info(dev->dev,
"Invalid MAC address, using random address %pM\n",
phy->macaddr);
}
}
EXPORT_SYMBOL_GPL(mt76_eeprom_override);
static bool mt76_string_prop_find(struct property *prop, const char *str)
{
const char *cp = NULL;
if (!prop || !str || !str[0])
return false;
while ((cp = of_prop_next_string(prop, cp)) != NULL)
if (!strcasecmp(cp, str))
return true;
return false;
}
static struct device_node *
mt76_find_power_limits_node(struct mt76_dev *dev)
{
struct device_node *np = dev->dev->of_node;
const char *const region_names[] = {
[NL80211_DFS_UNSET] = "ww",
[NL80211_DFS_ETSI] = "etsi",
[NL80211_DFS_FCC] = "fcc",
[NL80211_DFS_JP] = "jp",
};
struct device_node *cur, *fallback = NULL;
const char *region_name = NULL;
if (dev->region < ARRAY_SIZE(region_names))
region_name = region_names[dev->region];
np = of_get_child_by_name(np, "power-limits");
if (!np)
return NULL;
for_each_child_of_node(np, cur) {
struct property *country = of_find_property(cur, "country", NULL);
struct property *regd = of_find_property(cur, "regdomain", NULL);
if (!country && !regd) {
fallback = cur;
continue;
}
if (mt76_string_prop_find(country, dev->alpha2) ||
mt76_string_prop_find(regd, region_name)) {
of_node_put(np);
return cur;
}
}
of_node_put(np);
return fallback;
}
static const __be32 *
mt76_get_of_array(struct device_node *np, char *name, size_t *len, int min)
{
struct property *prop = of_find_property(np, name, NULL);
if (!prop || !prop->value || prop->length < min * 4)
return NULL;
*len = prop->length;
return prop->value;
}
static struct device_node *
mt76_find_channel_node(struct device_node *np, struct ieee80211_channel *chan)
{
struct device_node *cur;
const __be32 *val;
size_t len;
for_each_child_of_node(np, cur) {
val = mt76_get_of_array(cur, "channels", &len, 2);
if (!val)
continue;
while (len >= 2 * sizeof(*val)) {
if (chan->hw_value >= be32_to_cpu(val[0]) &&
chan->hw_value <= be32_to_cpu(val[1]))
return cur;
val += 2;
len -= 2 * sizeof(*val);
}
}
return NULL;
}
static s8
mt76_get_txs_delta(struct device_node *np, u8 nss)
{
const __be32 *val;
size_t len;
val = mt76_get_of_array(np, "txs-delta", &len, nss);
if (!val)
return 0;
return be32_to_cpu(val[nss - 1]);
}
static void
mt76_apply_array_limit(s8 *pwr, size_t pwr_len, const __be32 *data,
s8 target_power, s8 nss_delta, s8 *max_power)
{
int i;
if (!data)
return;
for (i = 0; i < pwr_len; i++) {
pwr[i] = min_t(s8, target_power,
be32_to_cpu(data[i]) + nss_delta);
*max_power = max(*max_power, pwr[i]);
}
}
static void
mt76_apply_multi_array_limit(s8 *pwr, size_t pwr_len, s8 pwr_num,
const __be32 *data, size_t len, s8 target_power,
s8 nss_delta, s8 *max_power)
{
int i, cur;
if (!data)
return;
len /= 4;
cur = be32_to_cpu(data[0]);
for (i = 0; i < pwr_num; i++) {
if (len < pwr_len + 1)
break;
mt76_apply_array_limit(pwr + pwr_len * i, pwr_len, data + 1,
target_power, nss_delta, max_power);
if (--cur > 0)
continue;
data += pwr_len + 1;
len -= pwr_len + 1;
if (!len)
break;
cur = be32_to_cpu(data[0]);
}
}
s8 mt76_get_rate_power_limits(struct mt76_phy *phy,
struct ieee80211_channel *chan,
struct mt76_power_limits *dest,
s8 target_power)
{
struct mt76_dev *dev = phy->dev;
struct device_node *np;
const __be32 *val;
char name[16];
u32 mcs_rates = dev->drv->mcs_rates;
u32 ru_rates = ARRAY_SIZE(dest->ru[0]);
char band;
size_t len;
s8 max_power = 0;
s8 txs_delta;
if (!mcs_rates)
mcs_rates = 10;
memset(dest, target_power, sizeof(*dest));
if (!IS_ENABLED(CONFIG_OF))
return target_power;
np = mt76_find_power_limits_node(dev);
if (!np)
return target_power;
switch (chan->band) {
case NL80211_BAND_2GHZ:
band = '2';
break;
case NL80211_BAND_5GHZ:
band = '5';
break;
case NL80211_BAND_6GHZ:
band = '6';
break;
default:
return target_power;
}
snprintf(name, sizeof(name), "txpower-%cg", band);
np = of_get_child_by_name(np, name);
if (!np)
return target_power;
np = mt76_find_channel_node(np, chan);
if (!np)
return target_power;
txs_delta = mt76_get_txs_delta(np, hweight8(phy->antenna_mask));
val = mt76_get_of_array(np, "rates-cck", &len, ARRAY_SIZE(dest->cck));
mt76_apply_array_limit(dest->cck, ARRAY_SIZE(dest->cck), val,
target_power, txs_delta, &max_power);
val = mt76_get_of_array(np, "rates-ofdm",
&len, ARRAY_SIZE(dest->ofdm));
mt76_apply_array_limit(dest->ofdm, ARRAY_SIZE(dest->ofdm), val,
target_power, txs_delta, &max_power);
val = mt76_get_of_array(np, "rates-mcs", &len, mcs_rates + 1);
mt76_apply_multi_array_limit(dest->mcs[0], ARRAY_SIZE(dest->mcs[0]),
ARRAY_SIZE(dest->mcs), val, len,
target_power, txs_delta, &max_power);
val = mt76_get_of_array(np, "rates-ru", &len, ru_rates + 1);
mt76_apply_multi_array_limit(dest->ru[0], ARRAY_SIZE(dest->ru[0]),
ARRAY_SIZE(dest->ru), val, len,
target_power, txs_delta, &max_power);
return max_power;
}
EXPORT_SYMBOL_GPL(mt76_get_rate_power_limits);
int
mt76_eeprom_init(struct mt76_dev *dev, int len)
{
dev->eeprom.size = len;
dev->eeprom.data = devm_kzalloc(dev->dev, len, GFP_KERNEL);
if (!dev->eeprom.data)
return -ENOMEM;
return !mt76_get_of_eeprom(dev, dev->eeprom.data, 0, len);
}
EXPORT_SYMBOL_GPL