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nvmem: u-boot-env: add Broadcom format support 

Broadcom uses U-Boot for a lot of their bcmbca familiy chipsets. They
decided to store U-Boot environment data inside U-Boot partition and to
use a custom header (with "uEnv" magic and env data length).

Add support for Broadcom's specific binding and their custom format.

Ref: 6b0584c19d ("dt-bindings: nvmem: u-boot,env: add Broadcom's variant binding")
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20221118063932.6418-9-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rafał Miłecki 2022-11-18 06:39:27 +00:00 committed by Greg Kroah-Hartman
parent fb817c4ef6
commit ada84d07af
1 changed files with 14 additions and 0 deletions
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14
drivers/nvmem/u-boot-env.c
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@ -16,6 +16,7 @@
enum u_boot_env_format {
U_BOOT_FORMAT_SINGLE,
U_BOOT_FORMAT_REDUNDANT,
U_BOOT_FORMAT_BROADCOM,
};
struct u_boot_env {
@ -40,6 +41,13 @@ struct u_boot_env_image_redundant {
uint8_t data[];
} __packed;
struct u_boot_env_image_broadcom {
__le32 magic;
__le32 len;
__le32 crc32;
uint8_t data[0];
} __packed;
static int u_boot_env_read(void *context, unsigned int offset, void *val,
size_t bytes)
{
@ -138,6 +146,11 @@ static int u_boot_env_parse(struct u_boot_env *priv)
crc32_data_offset = offsetof(struct u_boot_env_image_redundant, data);
data_offset = offsetof(struct u_boot_env_image_redundant, data);
break;
case U_BOOT_FORMAT_BROADCOM:
crc32_offset = offsetof(struct u_boot_env_image_broadcom, crc32);
crc32_data_offset = offsetof(struct u_boot_env_image_broadcom, data);
data_offset = offsetof(struct u_boot_env_image_broadcom, data);
break;
}
crc32 = le32_to_cpu(*(__le32 *)(buf + crc32_offset));
crc32_data_len = priv->mtd->size - crc32_data_offset;
@ -202,6 +215,7 @@ static const struct of_device_id u_boot_env_of_match_table[] = {
{ .compatible = "u-boot,env", .data = (void *)U_BOOT_FORMAT_SINGLE, },
{ .compatible = "u-boot,env-redundant-bool", .data = (void *)U_BOOT_FORMAT_REDUNDANT, },
{ .compatible = "u-boot,env-redundant-count", .data = (void *)U_BOOT_FORMAT_REDUNDANT, },
{ .compatible = "brcm,env", .data = (void *)U_BOOT_FORMAT_BROADCOM, },
{},
};