From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758126Ab2IEDTw (ORCPT ); Tue, 4 Sep 2012 23:19:52 -0400 Received: from db3ehsobe001.messaging.microsoft.com ([213.199.154.139]:26048 "EHLO db3outboundpool.messaging.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752763Ab2IEDTt (ORCPT ); Tue, 4 Sep 2012 23:19:49 -0400 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(zz154dMc8kzz1202h1082kzz8275bh8275dhz2dh2a8h668h839hd24he5bhf0ah107ah1155h) From: Dong Aisheng To: CC: , , , , , , , , , , , , Subject: [PATCH v6 1/4] mfd: add syscon driver based on regmap Date: Wed, 5 Sep 2012 10:57:13 +0800 Message-ID: <1346813836-28736-2-git-send-email-b29396@freescale.com> X-Mailer: git-send-email 1.7.0.4 In-Reply-To: <1346813836-28736-1-git-send-email-b29396@freescale.com> References: <1346813836-28736-1-git-send-email-b29396@freescale.com> MIME-Version: 1.0 Content-Type: text/plain X-OriginatorOrg: freescale.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.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 Acked-by: Stephen Warren Signed-off-by: Dong Aisheng --- ChangeLog: v5->v6: * using dev instead of &pdev->dev in probe v4->v5: * depends on OF * do not call of_node_put in syscon_node_to_regmap v3->v4: * add more description about syscon(provided by Stephen Warren) in binding doc. * fix a minor code indent error and remove set cache type code since the cache is disabled by default. 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 | 20 +++ drivers/mfd/Kconfig | 8 + drivers/mfd/Makefile | 1 + drivers/mfd/syscon.c | 176 ++++++++++++++++++++++ include/linux/mfd/syscon.h | 23 +++ 5 files changed, 228 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..fe8150b --- /dev/null +++ b/Documentation/devicetree/bindings/mfd/syscon.txt @@ -0,0 +1,20 @@ +* System Controller Registers R/W driver + +System controller node represents a register region containing a set +of miscellaneous registers. The registers are not cohesive enough to +represent as any specific type of device. The typical use-case is for +some other node's driver, or platform-specific code, to acquire a +reference to the syscon node (e.g. by phandle, node path, or search +using a specific compatible value), interrogate the node (or associated +OS driver) to determine the location of the registers, and access the +registers directly. + +Required properties: +- compatible: Should contain "syscon". +- reg: the register region can be accessed 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..82247b7 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_SYSCON + bool "System Controller Register R/W Based on Regmap" + depends on OF + 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..65fe609 --- /dev/null +++ b/drivers/mfd/syscon.c @@ -0,0 +1,176 @@ +/* + * 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); + 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; + struct regmap *regmap; + + syscon_np = of_find_compatible_node(NULL, NULL, s); + if (!syscon_np) + return ERR_PTR(-ENODEV); + + regmap = syscon_node_to_regmap(syscon_np); + of_node_put(syscon_np); + + return regmap; +} +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; + struct regmap *regmap; + + syscon_np = of_parse_phandle(np, property, 0); + if (!syscon_np) + return ERR_PTR(-ENODEV); + + regmap = syscon_node_to_regmap(syscon_np); + of_node_put(syscon_np); + + return regmap; +} +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(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(dev, syscon->base, + &syscon_regmap_config); + if (IS_ERR(syscon->regmap)) { + dev_err(dev, "regmap init failed\n"); + return PTR_ERR(syscon->regmap); + } + + syscon->dev = 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__ */ -- 1.7.0.4