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kernel: backport NVMEM patch for Broadcom's NVRAM MAC cells

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It has just been queued for the v6.5. It allows Ethernet drivers to read
MACs from NVRAM using NVMEM interface.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
This commit is contained in:
Rafał Miłecki 2023-05-14 12:14:14 +02:00
parent ecd9abc8c0
commit 4ab27bc6ef
1 changed files with 77 additions and 0 deletions
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77
target/linux/generic/backport-5.15/813-v6.5-nvmem-brcm_nvram-add-.read_post_process-for-MACs.patch Normal file
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@ -0,0 +1,77 @@
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
Date: Thu, 6 Apr 2023 12:46:16 +0200
Subject: [PATCH] nvmem: brcm_nvram: add .read_post_process() for MACs
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
1. Parse ASCII MAC format into byte based
2. Calculate relative addresses based on index argument
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
---
drivers/nvmem/Kconfig | 1 +
drivers/nvmem/brcm_nvram.c | 28 ++++++++++++++++++++++++++++
2 files changed, 29 insertions(+)
--- a/drivers/nvmem/Kconfig
+++ b/drivers/nvmem/Kconfig
@@ -55,6 +55,7 @@ config NVMEM_BRCM_NVRAM
tristate "Broadcom's NVRAM support"
depends on ARCH_BCM_5301X || COMPILE_TEST
depends on HAS_IOMEM
+ select GENERIC_NET_UTILS
help
This driver provides support for Broadcom's NVRAM that can be accessed
using I/O mapping.
--- a/drivers/nvmem/brcm_nvram.c
+++ b/drivers/nvmem/brcm_nvram.c
@@ -4,6 +4,8 @@
*/
#include <linux/bcm47xx_nvram.h>
+#include <linux/etherdevice.h>
+#include <linux/if_ether.h>
#include <linux/io.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
@@ -42,6 +44,25 @@ static int brcm_nvram_read(void *context
return 0;
}
+static int brcm_nvram_read_post_process_macaddr(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 brcm_nvram_add_cells(struct brcm_nvram *priv, uint8_t *data,
size_t len)
{
@@ -75,6 +96,13 @@ static int brcm_nvram_add_cells(struct b
priv->cells[idx].offset = value - (char *)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, "et0macaddr") ||
+ !strcmp(var, "et1macaddr") ||
+ !strcmp(var, "et2macaddr")) {
+ priv->cells[idx].raw_len = strlen(value);
+ priv->cells[idx].bytes = ETH_ALEN;
+ priv->cells[idx].read_post_process = brcm_nvram_read_post_process_macaddr;
+ }
}
return 0;