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| author | Rafał Miłecki <rafal@milecki.pl> | 2023-04-04 18:21:43 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-04-05 19:41:13 +0200 |
| commit | c49f1a8af6bcf6d18576bca898f8083ca4b129e1 (patch) | |
| tree | b87ec48147724963f9ce62ebd40feaf41778ed62 /drivers/nvmem | |
| parent | 55d4980ce55b6bb4be66877de4dbec513911b988 (diff) | |
| download | linux-c49f1a8af6bcf6d18576bca898f8083ca4b129e1.tar.gz | |
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: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20230404172148.82422-36-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/nvmem')
| -rw-r--r-- | drivers/nvmem/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/nvmem/u-boot-env.c | 26 |
2 files changed, 27 insertions, 0 deletions
diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig index a2afba11c8901..b291b27048c76 100644 --- a/drivers/nvmem/Kconfig +++ b/drivers/nvmem/Kconfig @@ -340,6 +340,7 @@ config NVMEM_U_BOOT_ENV tristate "U-Boot environment variables support" depends on OF && MTD select CRC32 + select GENERIC_NET_UTILS help U-Boot stores its setup as environment variables. This driver adds support for verifying & exporting such data. It also exposes variables diff --git a/drivers/nvmem/u-boot-env.c b/drivers/nvmem/u-boot-env.c index 29b1d87a3c515..ee9fd9989b6e2 100644 --- a/drivers/nvmem/u-boot-env.c +++ b/drivers/nvmem/u-boot-env.c @@ -4,6 +4,8 @@ */ #include <linux/crc32.h> +#include <linux/etherdevice.h> +#include <linux/if_ether.h> #include <linux/mod_devicetable.h> #include <linux/module.h> #include <linux/mtd/mtd.h> @@ -70,6 +72,25 @@ static int u_boot_env_read(void *context, unsigned int offset, void *val, 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, 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, priv->cells[idx].offset = data_offset + value - data; priv->cells[idx].bytes = strlen(value); 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)) |