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>
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Date: Thu, 13 Jul 2023 18:29:19 +0200
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Subject: [PATCH] nvmem: core: support "mac-base" fixed layout cells
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Fixed layout binding allows specifying "mac-base" NVMEM cells. It's used
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for base MAC address (that can be used for calculating relative
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addresses). It can be stored in a raw binary format or as an ASCII
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string.
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---
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--- a/drivers/nvmem/Kconfig
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+++ b/drivers/nvmem/Kconfig
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@@ -2,6 +2,7 @@
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menuconfig NVMEM
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bool "NVMEM Support"
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imply NVMEM_LAYOUTS
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+ select GENERIC_NET_UTILS
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help
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Support for NVMEM(Non Volatile Memory) devices like EEPROM, EFUSES...
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--- a/drivers/nvmem/core.c
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+++ b/drivers/nvmem/core.c
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@@ -7,9 +7,12 @@
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*/
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#include <linux/device.h>
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+#include <linux/ctype.h>
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+#include <linux/etherdevice.h>
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#include <linux/export.h>
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#include <linux/fs.h>
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#include <linux/idr.h>
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+#include <linux/if_ether.h>
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#include <linux/init.h>
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#include <linux/kref.h>
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#include <linux/module.h>
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@@ -796,6 +799,62 @@ static int nvmem_validate_keepouts(struc
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return 0;
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}
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+static int nvmem_mac_base_raw_read(void *context, const char *id, int index, unsigned int offset,
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+ void *buf, size_t bytes)
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+{
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+ if (WARN_ON(bytes != ETH_ALEN))
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+ return -EINVAL;
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+
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+ if (index)
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+ eth_addr_add(buf, index);
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+
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+ return 0;
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+}
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+
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+static int nvmem_mac_base_ascii_read(void *context, const char *id, int index, unsigned int offset,
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+ 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 (WARN_ON(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 nvmem_mac_base_hex_read(void *context, const char *id, int index, unsigned int offset,
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+ void *buf, size_t bytes)
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+{
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+ u8 mac[ETH_ALEN], *hexstr;
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+ int i;
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+
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+ if (WARN_ON(bytes != 2 * ETH_ALEN))
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+ return -EINVAL;
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+
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+ hexstr = (u8 *)buf;
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+ for (i = 0; i < ETH_ALEN; i++) {
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+ if (!isxdigit(hexstr[i * 2]) || !isxdigit(hexstr[i * 2 + 1]))
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+ return -EINVAL;
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+
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+ mac[i] = (hex_to_bin(hexstr[i * 2]) << 4) | hex_to_bin(hexstr[i * 2 + 1]);
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+ }
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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 nvmem_add_cells_from_dt(struct nvmem_device *nvmem, struct device_node *np)
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{
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struct device *dev = &nvmem->dev;
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@@ -835,6 +894,25 @@ static int nvmem_add_cells_from_dt(struc
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if (nvmem->fixup_dt_cell_info)
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nvmem->fixup_dt_cell_info(nvmem, &info);
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+ if (of_device_is_compatible(np, "fixed-layout")) {
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+ if (of_device_is_compatible(child, "mac-base")) {
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+ if (info.bytes == ETH_ALEN) {
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+ info.raw_len = info.bytes;
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+ info.bytes = ETH_ALEN;
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+ info.read_post_process = nvmem_mac_base_raw_read;
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+ } else if (info.bytes == 2 * ETH_ALEN) {
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+ info.raw_len = info.bytes;
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+ info.bytes = ETH_ALEN;
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+ info.read_post_process = nvmem_mac_base_hex_read;
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+ } else if (info.bytes == 3 * ETH_ALEN - 1) {
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+ info.raw_len = info.bytes;
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+ info.bytes = ETH_ALEN;
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+ info.read_post_process = nvmem_mac_base_ascii_read;
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+ }
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+
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+ }
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+ }
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+
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ret = nvmem_add_one_cell(nvmem, &info);
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kfree(info.name);
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if (ret) {
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