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mediatek: add driver for Adtran MFGINFO NVMEM layout
This driver allows retrieving MAC addresses and other factory information via the NVMEM framework on Adtran devices. Signed-off-by: Daniel Golle <daniel@makrotopia.org>
This commit is contained in:
Daniel Golle
parent
330321421a
commit
175bd80349
@ -313,6 +313,7 @@ CONFIG_NR_CPUS=4
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CONFIG_NVMEM=y
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CONFIG_NVMEM_BLOCK=y
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CONFIG_NVMEM_LAYOUTS=y
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CONFIG_NVMEM_LAYOUT_ADTRAN=y
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CONFIG_NVMEM_MTK_EFUSE=y
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CONFIG_NVMEM_SYSFS=y
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CONFIG_OF=y
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@ -314,7 +314,9 @@ CONFIG_NO_HZ_COMMON=y
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CONFIG_NO_HZ_IDLE=y
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CONFIG_NR_CPUS=2
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CONFIG_NVMEM=y
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CONFIG_NVMEM_BLOCK=y
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CONFIG_NVMEM_LAYOUTS=y
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CONFIG_NVMEM_LAYOUT_ADTRAN=y
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CONFIG_NVMEM_MTK_EFUSE=y
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CONFIG_NVMEM_SYSFS=y
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CONFIG_OF=y
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@ -436,6 +436,7 @@ CONFIG_NO_HZ_IDLE=y
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CONFIG_NR_CPUS=4
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CONFIG_NVMEM=y
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CONFIG_NVMEM_LAYOUTS=y
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# CONFIG_NVMEM_LAYOUT_ADTRAN is not set
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CONFIG_NVMEM_MTK_EFUSE=y
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# CONFIG_NVMEM_SPMI_SDAM is not set
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CONFIG_NVMEM_SYSFS=y
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@ -239,6 +239,7 @@ CONFIG_NO_HZ_IDLE=y
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CONFIG_NR_CPUS=2
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CONFIG_NVMEM=y
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CONFIG_NVMEM_LAYOUTS=y
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# CONFIG_NVMEM_LAYOUT_ADTRAN is not set
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# CONFIG_NVMEM_MTK_EFUSE is not set
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CONFIG_NVMEM_SYSFS=y
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CONFIG_OF=y
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@ -0,0 +1,191 @@
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From c22bc82183c2dea64919f975473ec518738baa3e Mon Sep 17 00:00:00 2001
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From: Daniel Golle <daniel@makrotopia.org>
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Date: Wed, 12 Jul 2023 13:38:35 +0100
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Subject: [PATCH] nvmem: add layout for Adtran devices
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Adtran stores unique factory data on GPT partitions on the eMMC.
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Using blk-nvmem the 'mfginfo' partition gets exposes as NVMEM provider.
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Add layout driver to parse mfginfo, mainly to provide MAC addresses to
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Ethernet and wireless interfaces.
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Variable names are converted to lower-case and '_' is replaced with '-'
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in order to comply with the device tree node naming convention.
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The main MAC address always ends on a 0 and up to 16 addresses are
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alocated for each device to use for various interfaces.
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Implement post-processing function for 'MFG_MAC' variable ('mfg-mac'
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node name in device tree) adding the nvmem cell index to the least
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significant digit of the MAC address.
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Signed-off-by: Daniel Golle <daniel@makrotopia.org>
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---
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drivers/nvmem/layouts/Kconfig | 9 +++
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drivers/nvmem/layouts/Makefile | 1 +
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drivers/nvmem/layouts/adtran.c | 135 +++++++++++++++++++++++++++++++++
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3 files changed, 145 insertions(+)
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create mode 100644 drivers/nvmem/layouts/adtran.c
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--- a/drivers/nvmem/layouts/Kconfig
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+++ b/drivers/nvmem/layouts/Kconfig
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@@ -8,6 +8,15 @@ if NVMEM_LAYOUTS
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menu "Layout Types"
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+config NVMEM_LAYOUT_ADTRAN
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+ tristate "Adtran mfginfo layout support"
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+ select GENERIC_NET_UTILS
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+ help
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+ Say Y here if you want to support the layout used by Adtran for
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+ mfginfo.
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+
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+ If unsure, say N.
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+
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config NVMEM_LAYOUT_SL28_VPD
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tristate "Kontron sl28 VPD layout support"
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select CRC8
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--- a/drivers/nvmem/layouts/Makefile
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+++ b/drivers/nvmem/layouts/Makefile
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@@ -6,3 +6,4 @@
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obj-$(CONFIG_NVMEM_LAYOUT_SL28_VPD) += sl28vpd.o
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obj-$(CONFIG_NVMEM_LAYOUT_ONIE_TLV) += onie-tlv.o
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obj-$(CONFIG_NVMEM_LAYOUT_U_BOOT_ENV) += u-boot-env.o
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+obj-$(CONFIG_NVMEM_LAYOUT_ADTRAN) += adtran.o
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--- /dev/null
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+++ b/drivers/nvmem/layouts/adtran.c
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@@ -0,0 +1,135 @@
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+// SPDX-License-Identifier: GPL-2.0
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+#include <linux/ctype.h>
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+#include <linux/etherdevice.h>
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+#include <linux/nvmem-consumer.h>
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+#include <linux/nvmem-provider.h>
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+#include <linux/of.h>
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+#include <linux/platform_device.h>
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+
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+/*
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+ * Adtran devices usually come with a main MAC address ending on 0 and
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+ * hence may have up to 16 MAC addresses per device.
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+ * The main MAC address is stored as variable MFG_MAC in ASCII format.
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+ */
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+static int adtran_mac_address_pp(void *priv, const char *id, int index,
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+ unsigned int offset, void *buf,
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+ 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 adtran_add_cells(struct nvmem_layout *layout)
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+{
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+ struct nvmem_device *nvmem = layout->nvmem;
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+ struct nvmem_cell_info info;
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+ struct device_node *layout_np;
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+ char mfginfo[1024], *c, *t, *p;
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+ int ret = -EINVAL;
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+
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+ ret = nvmem_device_read(nvmem, 0, sizeof(mfginfo), mfginfo);
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+ if (ret < 0)
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+ return ret;
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+ else if (ret != sizeof(mfginfo))
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+ return -EIO;
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+
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+ layout_np = of_nvmem_layout_get_container(nvmem);
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+ if (!layout_np)
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+ return -ENOENT;
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+
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+ c = mfginfo;
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+ while (*c != 0xff) {
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+ memset(&info, 0, sizeof(info));
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+ if (*c == '#')
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+ goto nextline;
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+
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+ t = strchr(c, '=');
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+ if (!t)
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+ goto nextline;
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+
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+ *t = '\0';
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+ ++t;
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+ info.offset = t - mfginfo;
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+ /* process variable name: convert to lower-case, '_' -> '-' */
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+ p = c;
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+ do {
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+ *p = tolower(*p);
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+ if (*p == '_')
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+ *p = '-';
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+ } while (*++p);
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+ info.name = c;
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+ c = strchr(t, 0xa); /* find newline */
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+ if (!c)
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+ break;
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+
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+ info.bytes = c - t;
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+ if (!strcmp(info.name, "mfg-mac")) {
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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 = adtran_mac_address_pp;
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+ }
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+
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+ info.np = of_get_child_by_name(layout_np, info.name);
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+ ret = nvmem_add_one_cell(nvmem, &info);
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+ if (ret)
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+ break;
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+
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+ ++c;
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+ continue;
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+
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+nextline:
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+ c = strchr(c, 0xa); /* find newline */
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+ if (!c)
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+ break;
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+ ++c;
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+ }
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+
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+ of_node_put(layout_np);
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+
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+ return ret;
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+}
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+
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+static int adtran_probe(struct nvmem_layout *layout)
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+{
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+ layout->add_cells = adtran_add_cells;
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+
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+ return nvmem_layout_register(layout);
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+}
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+
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+static void adtran_remove(struct nvmem_layout *layout)
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+{
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+ nvmem_layout_unregister(layout);
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+}
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+
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+static const struct of_device_id adtran_of_match_table[] = {
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+ { .compatible = "adtran,mfginfo" },
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+ {},
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+};
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+MODULE_DEVICE_TABLE(of, adtran_of_match_table);
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+
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+static struct nvmem_layout_driver adtran_layout = {
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+ .driver = {
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+ .owner = THIS_MODULE,
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+ .name = "adtran-layout",
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+ .of_match_table = adtran_of_match_table,
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+ },
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+ .probe = adtran_probe,
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+ .remove = adtran_remove,
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+};
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+module_nvmem_layout_driver(adtran_layout);
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+
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+MODULE_LICENSE("GPL");
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+MODULE_AUTHOR("Daniel Golle <daniel@makrotopia.org>");
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+MODULE_DESCRIPTION("NVMEM layout driver for Adtran mfginfo");
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