From patchwork Tue Aug 28 09:09:59 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aisheng Dong X-Patchwork-Id: 1379781 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by patchwork1.kernel.org (Postfix) with ESMTP id B04EE3FC71 for ; Tue, 28 Aug 2012 09:34:25 +0000 (UTC) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1T6I8T-0003Q4-Qp; Tue, 28 Aug 2012 09:31:02 +0000 Received: from tx2ehsobe002.messaging.microsoft.com ([65.55.88.12] helo=tx2outboundpool.messaging.microsoft.com) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1T6I89-0003Ml-Iw for linux-arm-kernel@lists.infradead.org; Tue, 28 Aug 2012 09:30:42 +0000 Received: from mail205-tx2-R.bigfish.com (10.9.14.247) by TX2EHSOBE014.bigfish.com (10.9.40.34) with Microsoft SMTP Server id 14.1.225.23; Tue, 28 Aug 2012 09:30:40 +0000 Received: from mail205-tx2 (localhost [127.0.0.1]) by mail205-tx2-R.bigfish.com (Postfix) with ESMTP id 067F5D40204; Tue, 28 Aug 2012 09:30:40 +0000 (UTC) X-Forefront-Antispam-Report: CIP:70.37.183.190; KIP:(null); UIP:(null); IPV:NLI; H:mail.freescale.net; RD:none; EFVD:NLI X-SpamScore: 1 X-BigFish: VS1(zz154dMc8kzz1202h1082kzz8275bh8275dhz2dh2a8h668h839hd24he5bhf0ah107ah) Received: from mail205-tx2 (localhost.localdomain [127.0.0.1]) by mail205-tx2 (MessageSwitch) id 1346146238752048_5179; Tue, 28 Aug 2012 09:30:38 +0000 (UTC) Received: from TX2EHSMHS039.bigfish.com (unknown [10.9.14.235]) by mail205-tx2.bigfish.com (Postfix) with ESMTP id A9590100044; Tue, 28 Aug 2012 09:30:38 +0000 (UTC) Received: from mail.freescale.net (70.37.183.190) by TX2EHSMHS039.bigfish.com (10.9.99.139) with Microsoft SMTP Server (TLS) id 14.1.225.23; Tue, 28 Aug 2012 09:30:37 +0000 Received: from az84smr01.freescale.net (10.64.34.197) by 039-SN1MMR1-003.039d.mgd.msft.net (10.84.1.16) with Microsoft SMTP Server (TLS) id 14.2.309.3; Tue, 28 Aug 2012 04:30:37 -0500 Received: from localhost.localdomain (shlinux2.ap.freescale.net [10.192.224.44]) by az84smr01.freescale.net (8.14.3/8.14.0) with ESMTP id q7S9UPiC009841; Tue, 28 Aug 2012 02:30:33 -0700 From: Dong Aisheng To: Subject: [PATCH v3 1/7] mfd: add syscon driver based on regmap Date: Tue, 28 Aug 2012 17:09:59 +0800 Message-ID: <1346145005-17961-2-git-send-email-b29396@freescale.com> X-Mailer: git-send-email 1.7.0.4 In-Reply-To: <1346145005-17961-1-git-send-email-b29396@freescale.com> References: <1346145005-17961-1-git-send-email-b29396@freescale.com> MIME-Version: 1.0 X-OriginatorOrg: freescale.com X-Spam-Note: CRM114 invocation failed X-Spam-Score: -4.2 (----) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-4.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 KHOP_BIG_TO_CC Sent to 10+ recipients instaed of Bcc or a list -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at http://www.dnswl.org/, medium trust [65.55.88.12 listed in list.dnswl.org] -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: linus.walleij@stericsson.com, swarren@wwwdotorg.org, devicetree-discuss@lists.ozlabs.org, s.hauer@pengutronix.de, broonie@opensource.wolfsonmicro.com, rob.herring@calxeda.com, grant.likely@secretlab.ca, richard.zhao@freescale.com, kernel@pengutronix.de, shawn.guo@linaro.org, lrg@ti.com, linux-arm-kernel@lists.infradead.org, sameo@linux.intel.com X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-arm-kernel-bounces@lists.infradead.org Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org From: Dong Aisheng Add regmap based syscon driver. This is usually used for access misc bits in registers which does not belong to a specific module, for example, IMX IOMUXC GPR and ANATOP. With this driver, client can use generic regmap API to access registers which are registered into syscon. Reviewed-by: Mark Brown Signed-off-by: Dong Aisheng Acked-by: Stephen Warren --- ChangeLog: v2->v3: * export regmap lookup APIs including syscon_node_to_regmap * fix a few typo v1->v2: * provide a way of retrieving the regmap, suggested by Mark Brown. * delete imx-syscon io accessors and using generic regmap API for client drivers. * change to a more generic name for other SoCs to use. --- Documentation/devicetree/bindings/mfd/syscon.txt | 11 ++ drivers/mfd/Kconfig | 7 + drivers/mfd/Makefile | 1 + drivers/mfd/syscon.c | 172 ++++++++++++++++++++++ include/linux/mfd/syscon.h | 23 +++ 5 files changed, 214 insertions(+), 0 deletions(-) diff --git a/Documentation/devicetree/bindings/mfd/syscon.txt b/Documentation/devicetree/bindings/mfd/syscon.txt new file mode 100644 index 0000000..0f0d26d --- /dev/null +++ b/Documentation/devicetree/bindings/mfd/syscon.txt @@ -0,0 +1,11 @@ +* System Controller Registers R/W driver + +Required properties: +- compatible: Should contain "syscon". +- reg: the register range can be access from syscon + +Examples: +gpr: iomuxc-gpr@020e0000 { + compatible = "fsl,imx6q-iomuxc-gpr", "syscon"; + reg = <0x020e0000 0x38>; +}; diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index b1a1462..4a6c48e 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -993,6 +993,13 @@ config MFD_ANATOP MFD controller. This controller embeds regulator and thermal devices for Freescale i.MX platforms. +config MFD_SYSCON + bool "System Controller Register R/W Based on Regmap" + select REGMAP_MMIO + help + Select this option to enable accessing system control registers + via regmap. + config MFD_PALMAS bool "Support for the TI Palmas series chips" select MFD_CORE diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 79dd22d..8384bc9 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -131,4 +131,5 @@ obj-$(CONFIG_MFD_PALMAS) += palmas.o obj-$(CONFIG_MFD_RC5T583) += rc5t583.o rc5t583-irq.o obj-$(CONFIG_MFD_SEC_CORE) += sec-core.o sec-irq.o obj-$(CONFIG_MFD_ANATOP) += anatop-mfd.o +obj-$(CONFIG_MFD_SYSCON) += syscon.o obj-$(CONFIG_MFD_LM3533) += lm3533-core.o lm3533-ctrlbank.o diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c new file mode 100644 index 0000000..e6e5b7a --- /dev/null +++ b/drivers/mfd/syscon.c @@ -0,0 +1,172 @@ +/* + * System Control Driver + * + * Copyright (C) 2012 Freescale Semiconductor, Inc. + * Copyright (C) 2012 Linaro Ltd. + * + * Author: Dong Aisheng + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +static struct platform_driver syscon_driver; + +struct syscon { + struct device *dev; + void __iomem *base; + struct regmap *regmap; +}; + +static int syscon_match(struct device *dev, void *data) +{ + struct syscon *syscon = dev_get_drvdata(dev); + struct device_node *dn = data; + + return (syscon->dev->of_node == dn) ? 1 : 0; +} + +struct regmap *syscon_node_to_regmap(struct device_node *np) +{ + struct syscon *syscon; + struct device *dev; + + dev = driver_find_device(&syscon_driver.driver, NULL, np, + syscon_match); + of_node_put(np); + + if (!dev) + return ERR_PTR(-EPROBE_DEFER); + + syscon = dev_get_drvdata(dev); + + return syscon->regmap; +} +EXPORT_SYMBOL_GPL(syscon_node_to_regmap); + +struct regmap *syscon_regmap_lookup_by_compatible(const char *s) +{ + struct device_node *syscon_np; + + syscon_np = of_find_compatible_node(NULL, NULL, s); + if (!syscon_np) + return ERR_PTR(-ENODEV); + + return syscon_node_to_regmap(syscon_np); +} +EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_compatible); + +struct regmap *syscon_regmap_lookup_by_phandle(struct device_node *np, + const char *property) +{ + struct device_node *syscon_np; + + syscon_np = of_parse_phandle(np, property, 0); + if (!syscon_np) + return ERR_PTR(-ENODEV); + + return syscon_node_to_regmap(syscon_np); +} +EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_phandle); + +static const struct of_device_id of_syscon_match[] = { + { .compatible = "syscon", }, + { }, +}; + +static struct regmap_config syscon_regmap_config = { + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, +}; + +static int __devinit syscon_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + struct syscon *syscon; + struct resource res; + int ret; + + if (!np) + return -ENOENT; + + syscon = devm_kzalloc(&pdev->dev, sizeof(struct syscon), + GFP_KERNEL); + if (!syscon) + return -ENOMEM; + + syscon->base = of_iomap(np, 0); + if (!syscon->base) + return -EADDRNOTAVAIL; + + ret = of_address_to_resource(np, 0, &res); + if (ret) + return ret; + + syscon_regmap_config.max_register = res.end - res.start - 3; + syscon->regmap = devm_regmap_init_mmio(&pdev->dev, syscon->base, + &syscon_regmap_config); + if (IS_ERR(syscon->regmap)) { + dev_err(&pdev->dev, "regmap init failed\n"); + return PTR_ERR(syscon->regmap); + } + + regcache_cache_only(syscon->regmap, false); + + syscon->dev = &pdev->dev; + platform_set_drvdata(pdev, syscon); + + dev_info(dev, "syscon regmap start 0x%x end 0x%x registered\n", + res.start, res.end); + + return 0; +} + +static int __devexit syscon_remove(struct platform_device *pdev) +{ + struct syscon *syscon; + + syscon = platform_get_drvdata(pdev); + iounmap(syscon->base); + platform_set_drvdata(pdev, NULL); + + return 0; +} + +static struct platform_driver syscon_driver = { + .driver = { + .name = "syscon", + .owner = THIS_MODULE, + .of_match_table = of_syscon_match, + }, + .probe = syscon_probe, + .remove = __devexit_p(syscon_remove), +}; + +static int __init syscon_init(void) +{ + return platform_driver_register(&syscon_driver); +} +postcore_initcall(syscon_init); + +static void __exit syscon_exit(void) +{ + platform_driver_unregister(&syscon_driver); +} +module_exit(syscon_exit); + +MODULE_AUTHOR("Dong Aisheng "); +MODULE_DESCRIPTION("System Control driver"); +MODULE_LICENSE("GPL v2"); diff --git a/include/linux/mfd/syscon.h b/include/linux/mfd/syscon.h new file mode 100644 index 0000000..6aeb6b8 --- /dev/null +++ b/include/linux/mfd/syscon.h @@ -0,0 +1,23 @@ +/* + * System Control Driver + * + * Copyright (C) 2012 Freescale Semiconductor, Inc. + * Copyright (C) 2012 Linaro Ltd. + * + * Author: Dong Aisheng + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#ifndef __LINUX_MFD_SYSCON_H__ +#define __LINUX_MFD_SYSCON_H__ + +extern struct regmap *syscon_node_to_regmap(struct device_node *np); +extern struct regmap *syscon_regmap_lookup_by_compatible(const char *s); +extern struct regmap *syscon_regmap_lookup_by_phandle( + struct device_node *np, + const char *property); +#endif /* __LINUX_MFD_SYSCON_H__ */