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82 lines
2.6 KiB
Diff
82 lines
2.6 KiB
Diff
From c49f1a8af6bcf6d18576bca898f8083ca4b129e1 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
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Date: Tue, 4 Apr 2023 18:21:43 +0100
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Subject: [PATCH] nvmem: u-boot-env: post-process "ethaddr" env variable
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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U-Boot environment variables are stored in ASCII format so "ethaddr"
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requires parsing into binary to make it work with Ethernet interfaces.
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This includes support for indexes to support #nvmem-cell-cells = <1>.
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Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
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Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
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Link: https://lore.kernel.org/r/20230404172148.82422-36-srinivas.kandagatla@linaro.org
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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drivers/nvmem/Kconfig | 1 +
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drivers/nvmem/u-boot-env.c | 26 ++++++++++++++++++++++++++
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2 files changed, 27 insertions(+)
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--- a/drivers/nvmem/Kconfig
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+++ b/drivers/nvmem/Kconfig
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@@ -340,6 +340,7 @@ config NVMEM_U_BOOT_ENV
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tristate "U-Boot environment variables support"
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depends on OF && MTD
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select CRC32
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+ select GENERIC_NET_UTILS
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help
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U-Boot stores its setup as environment variables. This driver adds
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support for verifying & exporting such data. It also exposes variables
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--- a/drivers/nvmem/u-boot-env.c
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+++ b/drivers/nvmem/u-boot-env.c
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@@ -4,6 +4,8 @@
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*/
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#include <linux/crc32.h>
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+#include <linux/etherdevice.h>
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+#include <linux/if_ether.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/mtd/mtd.h>
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@@ -70,6 +72,25 @@ static int u_boot_env_read(void *context
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return 0;
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}
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+static int u_boot_env_read_post_process_ethaddr(void *context, const char *id, int index,
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+ unsigned int offset, void *buf, size_t bytes)
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+{
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+ u8 mac[ETH_ALEN];
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+
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+ if (bytes != 3 * ETH_ALEN - 1)
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+ return -EINVAL;
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+
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+ if (!mac_pton(buf, mac))
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+ return -EINVAL;
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+
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+ if (index)
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+ eth_addr_add(mac, index);
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+
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+ ether_addr_copy(buf, mac);
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+
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+ return 0;
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+}
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+
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static int u_boot_env_add_cells(struct u_boot_env *priv, uint8_t *buf,
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size_t data_offset, size_t data_len)
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{
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@@ -101,6 +122,11 @@ static int u_boot_env_add_cells(struct u
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priv->cells[idx].offset = data_offset + value - data;
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priv->cells[idx].bytes = strlen(value);
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priv->cells[idx].np = of_get_child_by_name(dev->of_node, priv->cells[idx].name);
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+ if (!strcmp(var, "ethaddr")) {
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+ priv->cells[idx].raw_len = strlen(value);
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+ priv->cells[idx].bytes = ETH_ALEN;
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+ priv->cells[idx].read_post_process = u_boot_env_read_post_process_ethaddr;
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+ }
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}
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if (WARN_ON(idx != priv->ncells))
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