From patchwork Fri Nov 18 18:51:15 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Walle X-Patchwork-Id: 626263 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B85EEC4167D for ; Fri, 18 Nov 2022 18:52:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242831AbiKRSwN (ORCPT ); Fri, 18 Nov 2022 13:52:13 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52028 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242874AbiKRSv4 (ORCPT ); Fri, 18 Nov 2022 13:51:56 -0500 Received: from mail.3ffe.de (0001.3ffe.de [159.69.201.130]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D60E48FF87; Fri, 18 Nov 2022 10:51:54 -0800 (PST) Received: from mwalle01.kontron.local. (unknown [213.135.10.150]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mail.3ffe.de (Postfix) with ESMTPSA id C0056277B; Fri, 18 Nov 2022 19:51:31 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=walle.cc; s=mail2022082101; t=1668797491; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=zPyF1mrc47c3+6mXis4/lKngq7xzPMVCmN+GpzzRgwA=; b=MRCu00De+0KsxMt9La5DLDYZrF5QoyFQCMv5ov2I8PaSitbf0IJVvNyQLiezF8UAudmi+p RYqs9rlcrS6iHKC5NWJNIUNwSsXtqwWY4Y7jIhGhtJabdImd7TJLN6I0LiTpSjxsE2FWXK /n2Pl2Rxyty0F/wdAiWsjpz+r/JGWL+Al46oBRTKFOFPoAtZ9oKNnyqmtYh6O98op+BIcH gFLPP/SEz8lw0R72AlArKGUB8F1YcwuAGf5h4BEztVhuIhrZB0pJ1OEcyVQHDsrU/rYaSV 2I3mXVTyb/BMXZna/KBlmFd+yzK7rSoh9HoUba/tfy1pwXhXfNvv88647iwSGw== From: Michael Walle To: Jonathan Corbet , Srinivas Kandagatla , Miquel Raynal , Rob Herring , Frank Rowand Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, Michael Walle Subject: [PATCH v3 15/18] nvmem: layouts: add sl28vpd layout Date: Fri, 18 Nov 2022 19:51:15 +0100 Message-Id: <20221118185118.1190044-16-michael@walle.cc> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20221118185118.1190044-1-michael@walle.cc> References: <20221118185118.1190044-1-michael@walle.cc> MIME-Version: 1.0 X-Spam: Yes Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org This layout applies to the VPD of the Kontron sl28 boards. The VPD only contains a base MAC address. Therefore, we have to add an individual offset to it. This is done by taking the second argument of the nvmem phandle into account. Also this let us checking the VPD version and the checksum. Signed-off-by: Michael Walle --- changes since v2: - use of_nvmem_layout_get_container() changes since v1: - none drivers/nvmem/layouts/Kconfig | 9 ++ drivers/nvmem/layouts/Makefile | 2 + drivers/nvmem/layouts/sl28vpd.c | 153 ++++++++++++++++++++++++++++++++ 3 files changed, 164 insertions(+) create mode 100644 drivers/nvmem/layouts/sl28vpd.c diff --git a/drivers/nvmem/layouts/Kconfig b/drivers/nvmem/layouts/Kconfig index 9ad3911d1605..75082f6b471d 100644 --- a/drivers/nvmem/layouts/Kconfig +++ b/drivers/nvmem/layouts/Kconfig @@ -2,4 +2,13 @@ menu "Layout Types" +config NVMEM_LAYOUT_SL28_VPD + bool "Kontron sl28 VPD layout support" + select CRC8 + help + Say Y here if you want to support the VPD layout of the Kontron + SMARC-sAL28 boards. + + If unsure, say N. + endmenu diff --git a/drivers/nvmem/layouts/Makefile b/drivers/nvmem/layouts/Makefile index 6fdb3c60a4fa..fc617b9e87d0 100644 --- a/drivers/nvmem/layouts/Makefile +++ b/drivers/nvmem/layouts/Makefile @@ -2,3 +2,5 @@ # # Makefile for nvmem layouts. # + +obj-$(CONFIG_NVMEM_LAYOUT_SL28_VPD) += sl28vpd.o diff --git a/drivers/nvmem/layouts/sl28vpd.c b/drivers/nvmem/layouts/sl28vpd.c new file mode 100644 index 000000000000..a36800f201a3 --- /dev/null +++ b/drivers/nvmem/layouts/sl28vpd.c @@ -0,0 +1,153 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include +#include +#include +#include +#include + +#define SL28VPD_MAGIC 'V' + +struct sl28vpd_header { + u8 magic; + u8 version; +} __packed; + +struct sl28vpd_v1 { + struct sl28vpd_header header; + char serial_number[15]; + u8 base_mac_address[ETH_ALEN]; + u8 crc8; +} __packed; + +static int sl28vpd_mac_address_pp(void *priv, const char *id, int index, + unsigned int offset, void *buf, + size_t bytes) +{ + if (bytes != ETH_ALEN) + return -EINVAL; + + if (index < 0) + return -EINVAL; + + if (!is_valid_ether_addr(buf)) + return -EINVAL; + + eth_addr_add(buf, index); + + return 0; +} + +static const struct nvmem_cell_info sl28vpd_v1_entries[] = { + { + .name = "serial-number", + .offset = offsetof(struct sl28vpd_v1, serial_number), + .bytes = sizeof_field(struct sl28vpd_v1, serial_number), + }, + { + .name = "base-mac-address", + .offset = offsetof(struct sl28vpd_v1, base_mac_address), + .bytes = sizeof_field(struct sl28vpd_v1, base_mac_address), + .read_post_process = sl28vpd_mac_address_pp, + }, +}; + +static int sl28vpd_v1_check_crc(struct device *dev, struct nvmem_device *nvmem) +{ + struct sl28vpd_v1 data_v1; + u8 table[CRC8_TABLE_SIZE]; + int ret; + u8 crc; + + crc8_populate_msb(table, 0x07); + + ret = nvmem_device_read(nvmem, 0, sizeof(data_v1), &data_v1); + if (ret < 0) + return ret; + else if (ret != sizeof(data_v1)) + return -EIO; + + crc = crc8(table, (void *)&data_v1, sizeof(data_v1) - 1, 0); + + if (crc != data_v1.crc8) { + dev_err(dev, + "Checksum is invalid (got %02x, expected %02x).\n", + crc, data_v1.crc8); + return -EINVAL; + } + + return 0; +} + +static int sl28vpd_add_cells(struct device *dev, struct nvmem_device *nvmem, + struct nvmem_layout *layout) +{ + const struct nvmem_cell_info *pinfo; + struct nvmem_cell_info info = {0}; + struct device_node *layout_np; + struct sl28vpd_header hdr; + int ret, i; + + /* check header */ + ret = nvmem_device_read(nvmem, 0, sizeof(hdr), &hdr); + if (ret < 0) + return ret; + else if (ret != sizeof(hdr)) + return -EIO; + + if (hdr.magic != SL28VPD_MAGIC) { + dev_err(dev, "Invalid magic value (%02x)\n", hdr.magic); + return -EINVAL; + } + + if (hdr.version != 1) { + dev_err(dev, "Version %d is unsupported.\n", hdr.version); + return -EINVAL; + } + + ret = sl28vpd_v1_check_crc(dev, nvmem); + if (ret) + return ret; + + layout_np = of_nvmem_layout_get_container(nvmem); + if (!layout_np) + return -ENOENT; + + for (i = 0; i < ARRAY_SIZE(sl28vpd_v1_entries); i++) { + pinfo = &sl28vpd_v1_entries[i]; + + info.name = pinfo->name; + info.offset = pinfo->offset; + info.bytes = pinfo->bytes; + info.read_post_process = pinfo->read_post_process; + info.np = of_get_child_by_name(layout_np, pinfo->name); + + ret = nvmem_add_one_cell(nvmem, &info); + if (ret) { + of_node_put(layout_np); + return ret; + } + } + + of_node_put(layout_np); + + return 0; +} + +static const struct of_device_id sl28vpd_of_match_table[] = { + { .compatible = "kontron,sl28-vpd" }, + {}, +}; + +struct nvmem_layout sl28vpd_layout = { + .name = "sl28-vpd", + .of_match_table = sl28vpd_of_match_table, + .add_cells = sl28vpd_add_cells, +}; + +static int __init sl28vpd_init(void) +{ + return nvmem_layout_register(&sl28vpd_layout); +} +subsys_initcall(sl28vpd_init);