125 lines
3.1 KiB
Diff
125 lines
3.1 KiB
Diff
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
|
|
Date: Thu, 13 Jul 2023 18:29:19 +0200
|
|
Subject: [PATCH] nvmem: core: support "mac-base" fixed layout cells
|
|
|
|
Fixed layout binding allows specifying "mac-base" NVMEM cells. It's used
|
|
for base MAC address (that can be used for calculating relative
|
|
addresses). It can be stored in a raw binary format or as an ASCII
|
|
string.
|
|
---
|
|
|
|
--- a/drivers/nvmem/Kconfig
|
|
+++ b/drivers/nvmem/Kconfig
|
|
@@ -2,6 +2,7 @@
|
|
menuconfig NVMEM
|
|
bool "NVMEM Support"
|
|
imply NVMEM_LAYOUTS
|
|
+ select GENERIC_NET_UTILS
|
|
help
|
|
Support for NVMEM(Non Volatile Memory) devices like EEPROM, EFUSES...
|
|
|
|
--- a/drivers/nvmem/core.c
|
|
+++ b/drivers/nvmem/core.c
|
|
@@ -7,9 +7,12 @@
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
+#include <linux/ctype.h>
|
|
+#include <linux/etherdevice.h>
|
|
#include <linux/export.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/idr.h>
|
|
+#include <linux/if_ether.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kref.h>
|
|
#include <linux/module.h>
|
|
@@ -780,6 +783,62 @@ static int nvmem_validate_keepouts(struc
|
|
return 0;
|
|
}
|
|
|
|
+static int nvmem_mac_base_raw_read(void *context, const char *id, int index, unsigned int offset,
|
|
+ void *buf, size_t bytes)
|
|
+{
|
|
+ if (WARN_ON(bytes != ETH_ALEN))
|
|
+ return -EINVAL;
|
|
+
|
|
+ if (index)
|
|
+ eth_addr_add(buf, index);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static int nvmem_mac_base_ascii_read(void *context, const char *id, int index, unsigned int offset,
|
|
+ void *buf, size_t bytes)
|
|
+{
|
|
+ u8 mac[ETH_ALEN];
|
|
+
|
|
+ if (WARN_ON(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 nvmem_mac_base_hex_read(void *context, const char *id, int index, unsigned int offset,
|
|
+ void *buf, size_t bytes)
|
|
+{
|
|
+ u8 mac[ETH_ALEN], *hexstr;
|
|
+ int i;
|
|
+
|
|
+ if (WARN_ON(bytes != 2 * ETH_ALEN))
|
|
+ return -EINVAL;
|
|
+
|
|
+ hexstr = (u8 *)buf;
|
|
+ for (i = 0; i < ETH_ALEN; i++) {
|
|
+ if (!isxdigit(hexstr[i * 2]) || !isxdigit(hexstr[i * 2 + 1]))
|
|
+ return -EINVAL;
|
|
+
|
|
+ mac[i] = (hex_to_bin(hexstr[i * 2]) << 4) | hex_to_bin(hexstr[i * 2 + 1]);
|
|
+ }
|
|
+
|
|
+ if (index)
|
|
+ eth_addr_add(mac, index);
|
|
+
|
|
+ ether_addr_copy(buf, mac);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
static int nvmem_add_cells_from_dt(struct nvmem_device *nvmem, struct device_node *np)
|
|
{
|
|
struct device *dev = &nvmem->dev;
|
|
@@ -814,6 +873,25 @@ static int nvmem_add_cells_from_dt(struc
|
|
if (nvmem->fixup_dt_cell_info)
|
|
nvmem->fixup_dt_cell_info(nvmem, &info);
|
|
|
|
+ if (of_device_is_compatible(np, "fixed-layout")) {
|
|
+ if (of_device_is_compatible(child, "mac-base")) {
|
|
+ if (info.bytes == ETH_ALEN) {
|
|
+ info.raw_len = info.bytes;
|
|
+ info.bytes = ETH_ALEN;
|
|
+ info.read_post_process = nvmem_mac_base_raw_read;
|
|
+ } else if (info.bytes == 2 * ETH_ALEN) {
|
|
+ info.raw_len = info.bytes;
|
|
+ info.bytes = ETH_ALEN;
|
|
+ info.read_post_process = nvmem_mac_base_hex_read;
|
|
+ } else if (info.bytes == 3 * ETH_ALEN - 1) {
|
|
+ info.raw_len = info.bytes;
|
|
+ info.bytes = ETH_ALEN;
|
|
+ info.read_post_process = nvmem_mac_base_ascii_read;
|
|
+ }
|
|
+
|
|
+ }
|
|
+ }
|
|
+
|
|
ret = nvmem_add_one_cell(nvmem, &info);
|
|
kfree(info.name);
|
|
if (ret) {
|