Commit c49f1a8a authored by Rafał Miłecki's avatar Rafał Miłecki Committed by Greg Kroah-Hartman

nvmem: u-boot-env: post-process "ethaddr" env variable

U-Boot environment variables are stored in ASCII format so "ethaddr"
requires parsing into binary to make it work with Ethernet interfaces.

This includes support for indexes to support #nvmem-cell-cells = <1>.
Signed-off-by: default avatarRafał Miłecki <rafal@milecki.pl>
Signed-off-by: default avatarSrinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20230404172148.82422-36-srinivas.kandagatla@linaro.orgSigned-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 55d4980c
...@@ -340,6 +340,7 @@ config NVMEM_U_BOOT_ENV ...@@ -340,6 +340,7 @@ config NVMEM_U_BOOT_ENV
tristate "U-Boot environment variables support" tristate "U-Boot environment variables support"
depends on OF && MTD depends on OF && MTD
select CRC32 select CRC32
select GENERIC_NET_UTILS
help help
U-Boot stores its setup as environment variables. This driver adds U-Boot stores its setup as environment variables. This driver adds
support for verifying & exporting such data. It also exposes variables support for verifying & exporting such data. It also exposes variables
......
...@@ -4,6 +4,8 @@ ...@@ -4,6 +4,8 @@
*/ */
#include <linux/crc32.h> #include <linux/crc32.h>
#include <linux/etherdevice.h>
#include <linux/if_ether.h>
#include <linux/mod_devicetable.h> #include <linux/mod_devicetable.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/mtd/mtd.h> #include <linux/mtd/mtd.h>
...@@ -70,6 +72,25 @@ static int u_boot_env_read(void *context, unsigned int offset, void *val, ...@@ -70,6 +72,25 @@ static int u_boot_env_read(void *context, unsigned int offset, void *val,
return 0; return 0;
} }
static int u_boot_env_read_post_process_ethaddr(void *context, const char *id, int index,
unsigned int offset, void *buf, size_t bytes)
{
u8 mac[ETH_ALEN];
if (bytes != 3 * ETH_ALEN - 1)
return -EINVAL;
if (!mac_pton(buf, mac))
return -EINVAL;
if (index)
eth_addr_add(mac, index);
ether_addr_copy(buf, mac);
return 0;
}
static int u_boot_env_add_cells(struct u_boot_env *priv, uint8_t *buf, static int u_boot_env_add_cells(struct u_boot_env *priv, uint8_t *buf,
size_t data_offset, size_t data_len) size_t data_offset, size_t data_len)
{ {
...@@ -101,6 +122,11 @@ static int u_boot_env_add_cells(struct u_boot_env *priv, uint8_t *buf, ...@@ -101,6 +122,11 @@ static int u_boot_env_add_cells(struct u_boot_env *priv, uint8_t *buf,
priv->cells[idx].offset = data_offset + value - data; priv->cells[idx].offset = data_offset + value - data;
priv->cells[idx].bytes = strlen(value); priv->cells[idx].bytes = strlen(value);
priv->cells[idx].np = of_get_child_by_name(dev->of_node, priv->cells[idx].name); priv->cells[idx].np = of_get_child_by_name(dev->of_node, priv->cells[idx].name);
if (!strcmp(var, "ethaddr")) {
priv->cells[idx].raw_len = strlen(value);
priv->cells[idx].bytes = ETH_ALEN;
priv->cells[idx].read_post_process = u_boot_env_read_post_process_ethaddr;
}
} }
if (WARN_ON(idx != priv->ncells)) if (WARN_ON(idx != priv->ncells))
......
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