From patchwork Wed Aug 22 07:18:42 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aisheng Dong X-Patchwork-Id: 1360041 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by patchwork2.kernel.org (Postfix) with ESMTP id 7C5B0DF280 for ; Wed, 22 Aug 2012 07:41:34 +0000 (UTC) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1T45W1-0002dI-KY; Wed, 22 Aug 2012 07:38:13 +0000 Received: from db3ehsobe003.messaging.microsoft.com ([213.199.154.141] helo=db3outboundpool.messaging.microsoft.com) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1T45Vt-0002ci-KY for linux-arm-kernel@lists.infradead.org; Wed, 22 Aug 2012 07:38:11 +0000 Received: from mail97-db3-R.bigfish.com (10.3.81.245) by DB3EHSOBE007.bigfish.com (10.3.84.27) with Microsoft SMTP Server id 14.1.225.23; Wed, 22 Aug 2012 07:38:00 +0000 Received: from mail97-db3 (localhost [127.0.0.1]) by mail97-db3-R.bigfish.com (Postfix) with ESMTP id 46EA41600F1; Wed, 22 Aug 2012 07:38:00 +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: 6 X-BigFish: VS6(zzc8kzz1202h1082kzz8275dhz2dh2a8h668h839hd24he5bhf0ah107ah1155h) Received: from mail97-db3 (localhost.localdomain [127.0.0.1]) by mail97-db3 (MessageSwitch) id 1345621078265998_31093; Wed, 22 Aug 2012 07:37:58 +0000 (UTC) Received: from DB3EHSMHS005.bigfish.com (unknown [10.3.81.250]) by mail97-db3.bigfish.com (Postfix) with ESMTP id 3287C6004B; Wed, 22 Aug 2012 07:37:58 +0000 (UTC) Received: from mail.freescale.net (70.37.183.190) by DB3EHSMHS005.bigfish.com (10.3.87.105) with Microsoft SMTP Server (TLS) id 14.1.225.23; Wed, 22 Aug 2012 07:37:57 +0000 Received: from tx30smr01.am.freescale.net (10.81.153.31) by 039-SN1MMR1-004.039d.mgd.msft.net (10.84.1.14) with Microsoft SMTP Server (TLS) id 14.2.309.3; Wed, 22 Aug 2012 02:37:56 -0500 Received: from localhost.localdomain (shlinux2.ap.freescale.net [10.192.224.44]) by tx30smr01.am.freescale.net (8.14.3/8.14.0) with ESMTP id q7M7bcgp031199; Wed, 22 Aug 2012 00:37:51 -0700 From: Dong Aisheng To: Subject: [PATCH 1/7] mfd: add imx syscon driver based on regmap Date: Wed, 22 Aug 2012 15:18:42 +0800 Message-ID: <1345619928-15446-2-git-send-email-b29396@freescale.com> X-Mailer: git-send-email 1.7.0.4 In-Reply-To: <1345619928-15446-1-git-send-email-b29396@freescale.com> References: <1345619928-15446-1-git-send-email-b29396@freescale.com> MIME-Version: 1.0 X-OriginatorOrg: freescale.com X-Spam-Note: CRM114 invocation failed X-Spam-Score: -2.6 (--) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-2.6 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [213.199.154.141 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, paul.liu@linaro.org, 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 imx syscon driver. This is usually used for access misc bits in registers which does not belong to a specific module, for example, IOMUXC GPR and ANATOP. With this driver, we provide a standard API for client driver to call to access registers which are registered into syscon. Signed-off-by: Dong Aisheng --- Currently it's just simply for IMX, however the driver really is not too much imx specific. If people want, we probably could extend it to support other platforms too. --- .../devicetree/bindings/mfd/imx-syscon.txt | 11 + drivers/mfd/Kconfig | 8 + drivers/mfd/Makefile | 1 + drivers/mfd/imx-syscon.c | 193 ++++++++++++++++++++ include/linux/mfd/imx-syscon.h | 22 +++ 5 files changed, 235 insertions(+), 0 deletions(-) diff --git a/Documentation/devicetree/bindings/mfd/imx-syscon.txt b/Documentation/devicetree/bindings/mfd/imx-syscon.txt new file mode 100644 index 0000000..4a72994 --- /dev/null +++ b/Documentation/devicetree/bindings/mfd/imx-syscon.txt @@ -0,0 +1,11 @@ +* Freescale IMX System Controller Registers R/W driver + +Required properties: +- compatible: Should contain "fsl,imx-syscon". +- reg: the register range can be access from imx-syscon + +Examples: +gpr: iomuxc-gpr@020e0000 { + compatible = "fsl,imx6q-iomuxc", "fsl,imx-syscon"; + reg = <0x020e0000 0x38>; +}; diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index b1a1462..20a050e 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -993,6 +993,14 @@ config MFD_ANATOP MFD controller. This controller embeds regulator and thermal devices for Freescale i.MX platforms. +config MFD_IMX_SYSCON + bool "Freescale i.MX System Controller Register R/W Based on Regmap" + depends on ARCH_MXC + select REGMAP_MMIO + help + Select this option to enable access Freescale i.MX system control + registers like iomuxc gpr and anatop 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..82c7ee1 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-$(CONFIG_MFD_IMX_SYSCON) += imx-syscon.o obj-$(CONFIG_MFD_LM3533) += lm3533-core.o lm3533-ctrlbank.o diff --git a/drivers/mfd/imx-syscon.c b/drivers/mfd/imx-syscon.c new file mode 100644 index 0000000..141b456 --- /dev/null +++ b/drivers/mfd/imx-syscon.c @@ -0,0 +1,193 @@ +/* + * Freescale IMX 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 imx_syscon_driver; + +struct imx_syscon { + struct device *dev; + void __iomem *base; + struct regmap *regmap; +}; + +static int imx_syscon_match(struct device *dev, void *data) +{ + struct imx_syscon *syscon = dev_get_drvdata(dev); + struct device_node *dn = data; + + return (syscon->dev->of_node == dn) ? 1 : 0; +} + +int imx_syscon_write(struct device_node *np, u32 reg, u32 val) +{ + struct device *dev; + struct imx_syscon *syscon; + int ret = 0; + + dev = driver_find_device(&imx_syscon_driver.driver, NULL, np, + imx_syscon_match); + if (!dev) + return -EPROBE_DEFER; + + syscon = dev_get_drvdata(dev); + ret = regmap_write(syscon->regmap, reg, val); + if (ret) + dev_err(dev, "failed to write regmap(%s) reg 0x%x (%d)\n", + np->name, reg, ret); + + return ret; +} +EXPORT_SYMBOL_GPL(imx_syscon_write); + +int imx_syscon_read(struct device_node *np, u32 reg, u32 *val) +{ + struct device *dev; + struct imx_syscon *syscon; + int ret = 0; + + dev = driver_find_device(&imx_syscon_driver.driver, NULL, np, + imx_syscon_match); + if (!dev) + return -EPROBE_DEFER; + + syscon = dev_get_drvdata(dev); + ret = regmap_read(syscon->regmap, reg, val); + if (ret) + dev_err(dev, "failed to read regmap(%s) reg 0x%x (%d)\n", + np->name, reg, ret); + + return ret; +} +EXPORT_SYMBOL_GPL(imx_syscon_read); + +int imx_syscon_update_bits(struct device_node *np, u32 reg, + u32 mask, u32 val) +{ + struct device *dev; + struct imx_syscon *syscon; + int ret = 0; + + dev = driver_find_device(&imx_syscon_driver.driver, NULL, np, + imx_syscon_match); + if (!dev) + return -EPROBE_DEFER; + + syscon = dev_get_drvdata(dev); + ret = regmap_update_bits(syscon->regmap, reg, mask, val); + if (ret) + dev_err(dev, "failed to update regmap(%s) reg 0x%x (%d)\n", + np->name, reg, ret); + + return ret; +} +EXPORT_SYMBOL_GPL(imx_syscon_update_bits); + +static const struct of_device_id of_imx_syscon_match[] = { + { .compatible = "fsl,imx-syscon", }, + { }, +}; + +static struct regmap_config imx_syscon_regmap_config = { + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, +}; + +static int __devinit imx_syscon_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + struct imx_syscon *syscon; + struct resource res; + int ret; + + if (!np) + return -ENOENT; + + syscon = devm_kzalloc(&pdev->dev, sizeof(struct imx_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; + + imx_syscon_regmap_config.max_register = res.end - res.start - 3; + syscon->regmap = devm_regmap_init_mmio(&pdev->dev, syscon->base, + &imx_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); + + dev_info(dev, "syscon regmap start 0x%x end 0x%x registered\n", + res.start, res.end); + + syscon->dev = &pdev->dev; + platform_set_drvdata(pdev, syscon); + + return 0; +} + +static int __devexit imx_syscon_remove(struct platform_device *pdev) +{ + struct imx_syscon *syscon; + + syscon = platform_get_drvdata(pdev); + iounmap(syscon->base); + platform_set_drvdata(pdev, NULL); + + return 0; +} + +static struct platform_driver imx_syscon_driver = { + .driver = { + .name = "imx-syscon", + .owner = THIS_MODULE, + .of_match_table = of_imx_syscon_match, + }, + .probe = imx_syscon_probe, + .remove = imx_syscon_remove, +}; + +static int __init imx_syscon_init(void) +{ + return platform_driver_register(&imx_syscon_driver); +} +postcore_initcall(imx_syscon_init); + +static void __exit anatop_exit(void) +{ + platform_driver_unregister(&imx_syscon_driver); +} +module_exit(anatop_exit); + +MODULE_AUTHOR("Dong Aisheng "); +MODULE_DESCRIPTION("Freescale IMX System Control driver"); +MODULE_LICENSE("GPL v2"); diff --git a/include/linux/mfd/imx-syscon.h b/include/linux/mfd/imx-syscon.h new file mode 100644 index 0000000..be8b6db --- /dev/null +++ b/include/linux/mfd/imx-syscon.h @@ -0,0 +1,22 @@ +/* + * Freescale IMX 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_IMX_SYSCON_H__ +#define __LINUX_MFD_IMX_SYSCON_H__ + +extern int imx_syscon_write(struct device_node *np, u32 reg, u32 val); +extern int imx_syscon_read(struct device_node *np, u32 reg, u32 *val); +extern int imx_syscon_update_bits(struct device_node *np, u32 reg, + u32 mask, u32 val); +#endif /* __LINUX_MFD_IMX_SYSCON_H__ */