From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C7C3FC33C9E for ; Tue, 28 Jan 2020 11:18:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A028921739 for ; Tue, 28 Jan 2020 11:18:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725959AbgA1LSO (ORCPT ); Tue, 28 Jan 2020 06:18:14 -0500 Received: from szxga07-in.huawei.com ([45.249.212.35]:37672 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725937AbgA1LSO (ORCPT ); Tue, 28 Jan 2020 06:18:14 -0500 Received: from DGGEMS406-HUB.china.huawei.com (unknown [172.30.72.58]) by Forcepoint Email with ESMTP id 4F0272D8AA78D8510173; Tue, 28 Jan 2020 19:18:10 +0800 (CST) Received: from localhost.localdomain (10.69.192.58) by DGGEMS406-HUB.china.huawei.com (10.3.19.206) with Microsoft SMTP Server id 14.3.439.0; Tue, 28 Jan 2020 19:18:02 +0800 From: John Garry To: , CC: , , , , , , , John Garry Subject: [PATCH RFC 2/2] soc: Add a basic ACPI generic driver Date: Tue, 28 Jan 2020 19:14:19 +0800 Message-ID: <1580210059-199540-3-git-send-email-john.garry@huawei.com> X-Mailer: git-send-email 2.8.1 In-Reply-To: <1580210059-199540-1-git-send-email-john.garry@huawei.com> References: <1580210059-199540-1-git-send-email-john.garry@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.69.192.58] X-CFilter-Loop: Reflected Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Add a generic driver for platforms which populate their ACPI PPTT processor package ID Type Structure according to suggestion in the ACPI spec - see ACPI 6.2, section 5.2.29.3 ID structure Type 2. The soc_id is from member LEVEL_2_ID. For this, we need to use a whitelist of platforms which are known to populate the structure as suggested. For now, only the vendor and soc_id fields are exposed. Signed-off-by: John Garry --- drivers/soc/Makefile | 1 + drivers/soc/acpi_generic.c | 102 +++++++++++++++++++++++++++++++++++++ 2 files changed, 103 insertions(+) create mode 100644 drivers/soc/acpi_generic.c diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile index 8b49d782a1ab..2a59a30a22cd 100644 --- a/drivers/soc/Makefile +++ b/drivers/soc/Makefile @@ -3,6 +3,7 @@ # Makefile for the Linux Kernel SOC specific device drivers. # +obj-$(CONFIG_ACPI_PPTT) += acpi_generic.o obj-$(CONFIG_ARCH_ACTIONS) += actions/ obj-$(CONFIG_SOC_ASPEED) += aspeed/ obj-$(CONFIG_ARCH_AT91) += atmel/ diff --git a/drivers/soc/acpi_generic.c b/drivers/soc/acpi_generic.c new file mode 100644 index 000000000000..34a1f5f8e063 --- /dev/null +++ b/drivers/soc/acpi_generic.c @@ -0,0 +1,102 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) John Garry, john.garry@huawei.com + */ + +#define pr_fmt(fmt) "SOC ACPI GENERIC: " fmt + +#include +#include + +/* + * Known platforms that fill in PPTT package ID structures according to + * ACPI spec examples, that being: + * - Custom driver attribute is in ID Type Structure VENDOR_ID member + * - SoC id is in ID Type Structure LEVEL_2_ID member + * See ACPI SPEC 6.2 Table 5-154 for PPTT ID Type Structure + */ +static struct acpi_platform_list plat_list[] = { + {"HISI ", "HIP08 ", 0, ACPI_SIG_PPTT, all_versions}, + { } /* End */ +}; + +struct acpi_generic_soc_struct { + struct soc_device_attribute dev_attr; + u32 vendor; +}; + +static ssize_t vendor_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct acpi_generic_soc_struct *soc = dev_get_drvdata(dev); + u8 vendor_id[5] = {}; + + *(u32 *)vendor_id = soc->vendor; + + return sprintf(buf, "%s\n", vendor_id); +} + +static DEVICE_ATTR_RO(vendor); + +static __init int soc_acpi_generic_init(void) +{ + int index; + + index = acpi_match_platform_list(plat_list); + if (index < 0) + return -ENOENT; + + index = 0; + while (true) { + struct acpi_pptt_package_info info; + + if (!acpi_pptt_get_package_info(index, &info)) { + struct soc_device_attribute *soc_dev_attr; + struct acpi_generic_soc_struct *soc; + struct soc_device *soc_dev; + u8 soc_id[9] = {}; + + *(u64 *)soc_id = info.LEVEL_2_ID; + + soc = kzalloc(sizeof(*soc), GFP_KERNEL); + if (!soc) + return -ENOMEM; + + soc_dev_attr = &soc->dev_attr; + soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "%s", + soc_id); + if (!soc_dev_attr->soc_id) { + kfree(soc); + return -ENOMEM; + } + soc->vendor = info.vendor_id; + + soc_dev = soc_device_register(soc_dev_attr); + if (IS_ERR(soc_dev)) { + int ret = PTR_ERR(soc_dev); + + pr_info("could not register soc (%d) index=%d\n", + ret, index); + kfree(soc_dev_attr->soc_id); + kfree(soc); + return ret; + } + dev_set_drvdata(soc_device_to_device(soc_dev), soc); + device_create_file(soc_device_to_device(soc_dev), + &dev_attr_vendor); + } else { + break; + } + + index++; + } + + return 0; +} + +module_init(soc_acpi_generic_init); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("John Garry "); +MODULE_DESCRIPTION("Generic ACPI soc driver"); -- 2.17.1