From patchwork Tue Sep 18 07:35:27 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eugen Hristev X-Patchwork-Id: 146877 Delivered-To: patch@linaro.org Received: by 2002:a2e:1648:0:0:0:0:0 with SMTP id 8-v6csp4705642ljw; Tue, 18 Sep 2018 00:42:09 -0700 (PDT) X-Google-Smtp-Source: ANB0VdaFMNpUxm75dZLjN/wHYxcH4/aQ6XHu1uzdOBv5TCwr5jzbuXWoXcY0GAu5E2xJib/rxwOC X-Received: by 2002:a50:de8e:: with SMTP id c14-v6mr47434167edl.196.1537256528984; Tue, 18 Sep 2018 00:42:08 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1537256528; cv=none; d=google.com; s=arc-20160816; b=SAoLfPLGVn1wU5JDpVQsdRQqqWPYubBBYBZ1JL3QA794U9Z3KtFCiwbjBg9wbtvMDZ qPB2ePB3TPMzCCbD9Gj5gftoF7b7VeyO0KcPiuqs4/cvmrCdDpcU4O0q7bJFQ9W6Eeql U3RWr4xj3v0x7aRD22eANf5GW73TPovwUhWxngrhQz2+b41WiZwj9o7clZxEsDHw9ov6 nD/zExi+K7Njwl/eI2/JhE32zuBlckYQgfhPu3G3R6vaa74wyHnADyrHw3nw/YUU7ZZ8 GvPg2YMlAUQfvJUuEhZT0rzk9NBzI+K6aocD78W60ZRJVKkNf7W45itsQRVoD2u3fJnb jAYQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=sender:errors-to:content-transfer-encoding:list-subscribe:list-help :list-post:list-archive:list-unsubscribe:list-id:precedence:subject :cc:mime-version:references:in-reply-to:message-id:date:to:from; bh=SzfaFSHL70Rua5npyqHSQFpHRjgz0+Jyrbtir1TlyDo=; b=wDKRpFSYsCLMtYPsg7lm1zjET/0HLIB6dpoTQ2uOEY+sah6C1M8z8zrMMJ8bflt1vw ikjUCNJQ/NcDOIyJrPXKP1jVqMFH5ZuM9+jvuoVu3IM3L9OTkfqo34aUd4L8/x/FFkt+ /mMX35k7uT2vgAQ7yNOrhdNAc8fVbokP7hfhPnYp0VqNoirvQLJNWtTEWwQBNZ3oVy2v 1MImEXM1O6j+d/px+xlmES+O+w/ARyvc9Eafw/Qq4pgfgVsb/zS4ZNF4oxFWzK5/kdc3 eZPFhzpFDgWBxF0lVtne4wwugdM9W695GIvXB3r9gvmhUTA3kPiBL0zg5yRQ04+Dbaqv AHMg== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of u-boot-bounces@lists.denx.de designates 81.169.180.215 as permitted sender) smtp.mailfrom=u-boot-bounces@lists.denx.de Return-Path: Received: from lists.denx.de (dione.denx.de. [81.169.180.215]) by mx.google.com with ESMTP id c51-v6si9752251eda.178.2018.09.18.00.42.08; Tue, 18 Sep 2018 00:42:08 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of u-boot-bounces@lists.denx.de designates 81.169.180.215 as permitted sender) client-ip=81.169.180.215; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of u-boot-bounces@lists.denx.de designates 81.169.180.215 as permitted sender) smtp.mailfrom=u-boot-bounces@lists.denx.de Received: by lists.denx.de (Postfix, from userid 105) id 832CDC21EE7; Tue, 18 Sep 2018 07:41:30 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lists.denx.de X-Spam-Level: X-Spam-Status: No, score=0.0 required=5.0 tests=none autolearn=unavailable autolearn_force=no version=3.4.0 Received: from lists.denx.de (localhost [IPv6:::1]) by lists.denx.de (Postfix) with ESMTP id 20A70C21E4F; Tue, 18 Sep 2018 07:40:34 +0000 (UTC) Received: by lists.denx.de (Postfix, from userid 105) id C0AB9C21E0D; Tue, 18 Sep 2018 07:40:31 +0000 (UTC) Received: from esa2.microchip.iphmx.com (esa2.microchip.iphmx.com [68.232.149.84]) by lists.denx.de (Postfix) with ESMTPS id DD081C21D74 for ; Tue, 18 Sep 2018 07:40:29 +0000 (UTC) X-IronPort-AV: E=Sophos;i="5.53,389,1531810800"; d="scan'208";a="20067714" Received: from smtpout.microchip.com (HELO email.microchip.com) ([198.175.253.82]) by esa2.microchip.iphmx.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 18 Sep 2018 00:40:29 -0700 Received: from eh-station.mchp-main.com (10.10.76.4) by chn-sv-exch06.mchp-main.com (10.10.76.107) with Microsoft SMTP Server id 14.3.352.0; Tue, 18 Sep 2018 00:40:28 -0700 From: Eugen Hristev To: , Date: Tue, 18 Sep 2018 10:35:27 +0300 Message-ID: <1537256157-18001-5-git-send-email-eugen.hristev@microchip.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1537256157-18001-1-git-send-email-eugen.hristev@microchip.com> References: <1537256157-18001-1-git-send-email-eugen.hristev@microchip.com> MIME-Version: 1.0 Cc: maxime.ripard@bootlin.com, Maxime Ripard , nicolas.ferre@microchip.com Subject: [U-Boot] [PATCH v4 04/34] W1-EEPROM: Add an W1-EEPROM uclass for 1 wire EEPROMs X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.18 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" From: Maxime Ripard We might want to access data stored onto one wire EEPROMs. Create a framework to provide a consistent API. Signed-off-by: Maxime Ripard [eugen.hristev@microchip.com: reworked patch] Signed-off-by: Eugen Hristev --- drivers/Kconfig | 2 + drivers/Makefile | 1 + drivers/w1-eeprom/Kconfig | 17 +++++ drivers/w1-eeprom/Makefile | 2 + drivers/w1-eeprom/w1-eeprom-uclass.c | 116 +++++++++++++++++++++++++++++++++++ include/dm/uclass-id.h | 1 + include/w1-eeprom.h | 33 ++++++++++ 7 files changed, 172 insertions(+) create mode 100644 drivers/w1-eeprom/Kconfig create mode 100644 drivers/w1-eeprom/Makefile create mode 100644 drivers/w1-eeprom/w1-eeprom-uclass.c create mode 100644 include/w1-eeprom.h diff --git a/drivers/Kconfig b/drivers/Kconfig index 6f91eac..e4396b4 100644 --- a/drivers/Kconfig +++ b/drivers/Kconfig @@ -108,6 +108,8 @@ source "drivers/video/Kconfig" source "drivers/w1/Kconfig" +source "drivers/w1-eeprom/Kconfig" + source "drivers/watchdog/Kconfig" config PHYS_TO_BUS diff --git a/drivers/Makefile b/drivers/Makefile index 4ca07c3..1d5905f 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -106,6 +106,7 @@ obj-y += soc/ obj-y += thermal/ obj-y += axi/ obj-$(CONFIG_W1) += w1/ +obj-$(CONFIG_W1_EEPROM) += w1-eeprom/ obj-$(CONFIG_MACH_PIC32) += ddr/microchip/ endif diff --git a/drivers/w1-eeprom/Kconfig b/drivers/w1-eeprom/Kconfig new file mode 100644 index 0000000..d5ddc80 --- /dev/null +++ b/drivers/w1-eeprom/Kconfig @@ -0,0 +1,17 @@ +# +# EEPROM subsystem configuration +# + +menu "1-wire EEPROM support" + +config W1_EEPROM + bool "Enable support for EEPROMs on 1wire interface" + depends on DM + help + Support for the EEPROMs connected on 1-wire Dallas protocol interface + +if W1_EEPROM + +endif + +endmenu diff --git a/drivers/w1-eeprom/Makefile b/drivers/w1-eeprom/Makefile new file mode 100644 index 0000000..b72950e --- /dev/null +++ b/drivers/w1-eeprom/Makefile @@ -0,0 +1,2 @@ +obj-$(CONFIG_W1_EEPROM) += w1-eeprom-uclass.o + diff --git a/drivers/w1-eeprom/w1-eeprom-uclass.c b/drivers/w1-eeprom/w1-eeprom-uclass.c new file mode 100644 index 0000000..7b05793 --- /dev/null +++ b/drivers/w1-eeprom/w1-eeprom-uclass.c @@ -0,0 +1,116 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * + * Copyright (c) 2015 Free Electrons + * Copyright (c) 2015 NextThing Co. + * Copyright (c) 2018 Microchip Technology, Inc. + * + * Maxime Ripard + * Eugen Hristev + * + */ + +#include +#include +#include +#include + +#include + +int w1_eeprom_read_buf(struct udevice *dev, unsigned int offset, + u8 *buf, unsigned int count) +{ + const struct w1_eeprom_ops *ops = device_get_ops(dev); + u64 id = 0; + int ret; + + if (!ops->read_buf) + return -ENOSYS; + + ret = w1_eeprom_get_id(dev, &id); + if (ret) + return ret; + if (!id) + return -ENODEV; + + return ops->read_buf(dev, offset, buf, count); +} + +int w1_eeprom_register_new_device(u64 id) +{ + u8 family = id & 0xff; + int ret; + struct udevice *dev; + + for (ret = uclass_first_device(UCLASS_W1_EEPROM, &dev); + !ret && dev; + uclass_next_device(&dev)) { + if (ret || !dev) { + debug("cannot find w1 eeprom dev\n"); + return ret; + } + if (dev_get_driver_data(dev) == family) { + struct w1_device *w1; + + w1 = dev_get_parent_platdata(dev); + if (w1->id) /* device already in use */ + continue; + w1->id = id; + debug("%s: Match found: %s:%s %llx\n", __func__, + dev->name, dev->driver->name, id); + return 0; + } + } + + debug("%s: No matches found: error %d\n", __func__, ret); + + return ret; +} + +int w1_eeprom_get_id(struct udevice *dev, u64 *id) +{ + struct w1_device *w1 = dev_get_parent_platdata(dev); + + if (!w1) + return -ENODEV; + *id = w1->id; + + return 0; +} + +UCLASS_DRIVER(w1_eeprom) = { + .name = "w1_eeprom", + .id = UCLASS_W1_EEPROM, + .flags = DM_UC_FLAG_SEQ_ALIAS, +#if CONFIG_IS_ENABLED(OF_CONTROL) + .post_bind = dm_scan_fdt_dev, +#endif +}; + +int w1_eeprom_dm_init(void) +{ + struct udevice *dev; + struct uclass *uc; + int ret; + + ret = uclass_get(UCLASS_W1_EEPROM, &uc); + if (ret) { + debug("W1_EEPROM uclass not available\n"); + return ret; + } + + uclass_foreach_dev(dev, uc) { + ret = device_probe(dev); + if (ret == -ENODEV) { /* No such device. */ + debug("W1_EEPROM not available.\n"); + continue; + } + + if (ret) { /* Other error. */ + printf("W1_EEPROM probe failed, error %d\n", ret); + continue; + } + } + + return 0; +} diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h index fa72afb..71adf7e 100644 --- a/include/dm/uclass-id.h +++ b/include/dm/uclass-id.h @@ -93,6 +93,7 @@ enum uclass_id { UCLASS_VIDEO_BRIDGE, /* Video bridge, e.g. DisplayPort to LVDS */ UCLASS_VIDEO_CONSOLE, /* Text console driver for video device */ UCLASS_W1, /* Dallas 1-Wire bus */ + UCLASS_W1_EEPROM, /* one-wire EEPROMs */ UCLASS_WDT, /* Watchdot Timer driver */ UCLASS_COUNT, diff --git a/include/w1-eeprom.h b/include/w1-eeprom.h new file mode 100644 index 0000000..2233736 --- /dev/null +++ b/include/w1-eeprom.h @@ -0,0 +1,33 @@ +/* SPDX-License-Identifier: GPL-2.0+ + * + * Copyright (c) 2015 Free Electrons + * Copyright (c) 2015 NextThing Co + * Copyright (c) 2018 Microchip Technology, Inc. + * + */ + +#ifndef __W1_EEPROM_H +#define __W1_EEPROM_H + +struct udevice; + +struct w1_eeprom_ops { + /* + * Reads a buff from the given EEPROM memory, starting at + * given offset and place the results into the given buffer. + * Should read given count of bytes. + * Should return 0 on success, and normal error.h on error + */ + int (*read_buf)(struct udevice *dev, unsigned int offset, + u8 *buf, unsigned int count); +}; + +int w1_eeprom_read_buf(struct udevice *dev, unsigned int offset, + u8 *buf, unsigned int count); + +int w1_eeprom_dm_init(void); + +int w1_eeprom_register_new_device(u64 id); + +int w1_eeprom_get_id(struct udevice *dev, u64 *id); +#endif