From patchwork Mon Feb 3 14:28:43 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Srinivas KANDAGATLA X-Patchwork-Id: 3569631 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 1AE4F9F2F5 for ; Mon, 3 Feb 2014 14:36:07 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 0F1682016C for ; Mon, 3 Feb 2014 14:36:06 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id AD00820149 for ; Mon, 3 Feb 2014 14:36:04 +0000 (UTC) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1WAKct-0007G0-O8; Mon, 03 Feb 2014 14:35:55 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1WAKcr-0002Kd-BH; Mon, 03 Feb 2014 14:35:53 +0000 Received: from eu1sys200aog117.obsmtp.com ([207.126.144.143]) by merlin.infradead.org with smtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1WAKcn-0002J5-8i for linux-arm-kernel@lists.infradead.org; Mon, 03 Feb 2014 14:35:50 +0000 Received: from beta.dmz-eu.st.com ([164.129.1.35]) (using TLSv1) by eu1sys200aob117.postini.com ([207.126.147.11]) with SMTP ID DSNKUu+pH5ZsqDPgOXKz8YNap0IWFOlt4Ewh@postini.com; Mon, 03 Feb 2014 14:35:49 UTC Received: from zeta.dmz-eu.st.com (zeta.dmz-eu.st.com [164.129.230.9]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id D42B7EE; Mon, 3 Feb 2014 14:34:20 +0000 (GMT) Received: from Webmail-eu.st.com (Safex1hubcas23.st.com [10.75.90.46]) by zeta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 9E61F163C0; Mon, 3 Feb 2014 14:35:07 +0000 (GMT) Received: from localhost (10.65.51.147) by webmail-ga.st.com (10.75.90.48) with Microsoft SMTP Server (TLS) id 14.3.123.3; Mon, 3 Feb 2014 15:35:09 +0100 From: To: Subject: [PATCH v2 3/6] drivers: reset: Reset controller driver for STiH416 Date: Mon, 3 Feb 2014 14:28:43 +0000 Message-ID: <1391437723-12055-1-git-send-email-srinivas.kandagatla@st.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1391437665-11913-1-git-send-email-srinivas.kandagatla@st.com> References: <1391437665-11913-1-git-send-email-srinivas.kandagatla@st.com> MIME-Version: 1.0 X-Originating-IP: [10.65.51.147] X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140203_093549_643454_C2D5D9F7 X-CRM114-Status: GOOD ( 23.86 ) X-Spam-Score: -4.2 (----) Cc: Mark Rutland , devicetree@vger.kernel.org, Russell King , Rob Landley , Pawel Moll , Ian Campbell , Olof Johansson , Srinivas Kandagatla , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, stephen.gallimore@st.com, Stuart Menefy , Rob Herring , Arnd Bergmann , Philipp Zabel , Kumar Gala , Grant Likely , kernel@stlinux.com X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.7 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Stephen Gallimore This patch adds a reset controller platform driver for the STiH416 SoC. This initial version provides a compatible driver for the "st,stih416-powerdown" device, which registers a system configuration register based reset controller that controls the powerdown state of hardware such as the on-chip USB host controllers. Signed-off-by: Stephen Gallimore --- arch/arm/boot/dts/stih416.dtsi | 6 ++ drivers/reset/sti/Kconfig | 4 + drivers/reset/sti/Makefile | 2 +- drivers/reset/sti/reset-stih416.c | 79 ++++++++++++++++++++ .../dt-bindings/reset-controller/stih416-resets.h | 21 ++++++ 5 files changed, 111 insertions(+), 1 deletion(-) create mode 100644 drivers/reset/sti/reset-stih416.c create mode 100644 include/dt-bindings/reset-controller/stih416-resets.h diff --git a/arch/arm/boot/dts/stih416.dtsi b/arch/arm/boot/dts/stih416.dtsi index b7ab47b..e5bec66 100644 --- a/arch/arm/boot/dts/stih416.dtsi +++ b/arch/arm/boot/dts/stih416.dtsi @@ -10,6 +10,7 @@ #include "stih416-clock.dtsi" #include "stih416-pinctrl.dtsi" #include +#include / { L2: cache-controller { compatible = "arm,pl310-cache"; @@ -27,6 +28,11 @@ ranges; compatible = "simple-bus"; + powerdown: powerdown-controller { + #reset-cells = <1>; + compatible = "st,stih416-powerdown"; + }; + syscfg_sbc:sbc-syscfg@fe600000{ compatible = "st,stih416-sbc-syscfg", "syscon"; reg = <0xfe600000 0x1000>; diff --git a/drivers/reset/sti/Kconfig b/drivers/reset/sti/Kconfig index ef6654a..88d2d03 100644 --- a/drivers/reset/sti/Kconfig +++ b/drivers/reset/sti/Kconfig @@ -8,4 +8,8 @@ config STIH415_RESET bool select STI_RESET_SYSCFG +config STIH416_RESET + bool + select STI_RESET_SYSCFG + endif diff --git a/drivers/reset/sti/Makefile b/drivers/reset/sti/Makefile index fce4433..be1c976 100644 --- a/drivers/reset/sti/Makefile +++ b/drivers/reset/sti/Makefile @@ -1,4 +1,4 @@ obj-$(CONFIG_STI_RESET_SYSCFG) += reset-syscfg.o -# SoC specific reset devices obj-$(CONFIG_STIH415_RESET) += reset-stih415.o +obj-$(CONFIG_STIH416_RESET) += reset-stih416.o diff --git a/drivers/reset/sti/reset-stih416.c b/drivers/reset/sti/reset-stih416.c new file mode 100644 index 0000000..0becfc5 --- /dev/null +++ b/drivers/reset/sti/reset-stih416.c @@ -0,0 +1,79 @@ +/* + * Copyright (C) 2013 STMicroelectronics (R&D) Limited + * Author: Stephen Gallimore + * Author: Srinivas Kandagatla + * + * 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 "reset-syscfg.h" + +/* + * STiH416 Peripheral powerdown definitions. + */ +static const char stih416_front[] = "st,stih416-front-syscfg"; +static const char stih416_rear[] = "st,stih416-rear-syscfg"; +static const char stih416_sbc[] = "st,stih416-sbc-syscfg"; +static const char stih416_lpm[] = "st,stih416-lpm-syscfg"; + +#define STIH416_PDN_FRONT(_bit) \ + _SYSCFG_RST_CH(stih416_front, SYSCFG_1500, _bit, SYSSTAT_1578, _bit) + +#define STIH416_PDN_REAR(_cntl, _stat) \ + _SYSCFG_RST_CH(stih416_rear, SYSCFG_2525, _cntl, SYSSTAT_2583, _stat) + +#define SYSCFG_1500 0x7d0 /* Powerdown request EMI/NAND/Keyscan */ +#define SYSSTAT_1578 0x908 /* Powerdown status EMI/NAND/Keyscan */ + +#define SYSCFG_2525 0x834 /* Powerdown request USB/SATA/PCIe */ +#define SYSSTAT_2583 0x91c /* Powerdown status USB/SATA/PCIe */ + +static const struct syscfg_reset_channel_data stih416_powerdowns[] = { + [STIH416_EMISS_POWERDOWN] = STIH416_PDN_FRONT(0), + [STIH416_NAND_POWERDOWN] = STIH416_PDN_FRONT(1), + [STIH416_KEYSCAN_POWERDOWN] = STIH416_PDN_FRONT(2), + [STIH416_USB0_POWERDOWN] = STIH416_PDN_REAR(0, 0), + [STIH416_USB1_POWERDOWN] = STIH416_PDN_REAR(1, 1), + [STIH416_USB2_POWERDOWN] = STIH416_PDN_REAR(2, 2), + [STIH416_USB3_POWERDOWN] = STIH416_PDN_REAR(6, 5), + [STIH416_SATA0_POWERDOWN] = STIH416_PDN_REAR(3, 3), + [STIH416_SATA1_POWERDOWN] = STIH416_PDN_REAR(4, 4), + [STIH416_PCIE0_POWERDOWN] = STIH416_PDN_REAR(7, 9), + [STIH416_PCIE1_POWERDOWN] = STIH416_PDN_REAR(5, 8), +}; + +static struct syscfg_reset_controller_data stih416_powerdown_controller = { + .wait_for_ack = true, + .nr_channels = ARRAY_SIZE(stih416_powerdowns), + .channels = stih416_powerdowns, +}; + +static struct of_device_id stih416_reset_match[] = { + { .compatible = "st,stih416-powerdown", + .data = &stih416_powerdown_controller, }, + {}, +}; + +static struct platform_driver stih416_reset_driver = { + .probe = syscfg_reset_probe, + .driver = { + .name = "reset-stih416", + .owner = THIS_MODULE, + .of_match_table = stih416_reset_match, + }, +}; + +static int __init stih416_reset_init(void) +{ + return platform_driver_register(&stih416_reset_driver); +} +arch_initcall(stih416_reset_init); diff --git a/include/dt-bindings/reset-controller/stih416-resets.h b/include/dt-bindings/reset-controller/stih416-resets.h new file mode 100644 index 0000000..d7da55f --- /dev/null +++ b/include/dt-bindings/reset-controller/stih416-resets.h @@ -0,0 +1,21 @@ +/* + * This header provides constants for the reset controller + * based peripheral powerdown requests on the STMicroelectronics + * STiH416 SoC. + */ +#ifndef _DT_BINDINGS_RESET_CONTROLLER_STIH416 +#define _DT_BINDINGS_RESET_CONTROLLER_STIH416 + +#define STIH416_EMISS_POWERDOWN 0 +#define STIH416_NAND_POWERDOWN 1 +#define STIH416_KEYSCAN_POWERDOWN 2 +#define STIH416_USB0_POWERDOWN 3 +#define STIH416_USB1_POWERDOWN 4 +#define STIH416_USB2_POWERDOWN 5 +#define STIH416_USB3_POWERDOWN 6 +#define STIH416_SATA0_POWERDOWN 7 +#define STIH416_SATA1_POWERDOWN 8 +#define STIH416_PCIE0_POWERDOWN 9 +#define STIH416_PCIE1_POWERDOWN 10 + +#endif /* _DT_BINDINGS_RESET_CONTROLLER_STIH416 */