From patchwork Thu Jun 5 15:48:38 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Antoine Tenart X-Patchwork-Id: 356519 Return-Path: X-Original-To: incoming-imx@patchwork.ozlabs.org Delivered-To: patchwork-incoming-imx@bilbo.ozlabs.org Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2001:1868:205::9]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id B6D1C14008F for ; Fri, 6 Jun 2014 01:52:11 +1000 (EST) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1WsZv6-0008FT-1T; Thu, 05 Jun 2014 15:49:36 +0000 Received: from top.free-electrons.com ([176.31.233.9] helo=mail.free-electrons.com) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1WsZui-00089N-5e for linux-arm-kernel@lists.infradead.org; Thu, 05 Jun 2014 15:49:14 +0000 Received: by mail.free-electrons.com (Postfix, from userid 106) id 560CF7EC; Thu, 5 Jun 2014 17:48:49 +0200 (CEST) X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on mail.free-electrons.com X-Spam-Level: X-Spam-Status: No, score=-1.0 required=5.0 tests=ALL_TRUSTED,SHORTCIRCUIT shortcircuit=ham autolearn=disabled version=3.3.2 Received: from localhost.localdomain (col31-4-88-188-83-94.fbx.proxad.net [88.188.83.94]) by mail.free-electrons.com (Postfix) with ESMTPSA id BA65F7F6; Thu, 5 Jun 2014 17:48:48 +0200 (CEST) From: =?UTF-8?q?Antoine=20T=C3=A9nart?= To: sebastian.hesselbarth@gmail.com, p.zabel@pengutronix.de Subject: [PATCH 1/9] reset: add the Berlin reset controller driver Date: Thu, 5 Jun 2014 17:48:38 +0200 Message-Id: <1401983326-19205-2-git-send-email-antoine.tenart@free-electrons.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1401983326-19205-1-git-send-email-antoine.tenart@free-electrons.com> References: <1401983326-19205-1-git-send-email-antoine.tenart@free-electrons.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140605_084912_514269_EDAAC8D1 X-CRM114-Status: GOOD ( 18.02 ) X-Spam-Score: 0.3 (/) X-Spam-Report: SpamAssassin version 3.3.2 on bombadil.infradead.org summary: Content analysis details: (0.3 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 1.0 SPF_SOFTFAIL SPF: sender does not match SPF record (softfail) Cc: thomas.petazzoni@free-electrons.com, zmxu@marvell.com, =?UTF-8?q?Antoine=20T=C3=A9nart?= , linux-kernel@vger.kernel.org, alexandre.belloni@free-electrons.com, jszhang@marvell.com, linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+incoming-imx=patchwork.ozlabs.org@lists.infradead.org List-Id: linux-imx-kernel.lists.patchwork.ozlabs.org Add a reset controller for Marvell Berlin SoCs which is used by the USB PHYs drivers (for now). Signed-off-by: Antoine Ténart --- drivers/reset/Makefile | 1 + drivers/reset/reset-berlin.c | 113 +++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 114 insertions(+) create mode 100644 drivers/reset/reset-berlin.c diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile index 4f60caf750ce..fffe2a3dd255 100644 --- a/drivers/reset/Makefile +++ b/drivers/reset/Makefile @@ -1,3 +1,4 @@ obj-$(CONFIG_RESET_CONTROLLER) += core.o +obj-$(CONFIG_ARCH_BERLIN) += reset-berlin.o obj-$(CONFIG_ARCH_SUNXI) += reset-sunxi.o obj-$(CONFIG_ARCH_STI) += sti/ diff --git a/drivers/reset/reset-berlin.c b/drivers/reset/reset-berlin.c new file mode 100644 index 000000000000..78b42c882cb2 --- /dev/null +++ b/drivers/reset/reset-berlin.c @@ -0,0 +1,113 @@ +/* + * Copyright (C) 2014 Marvell Technology Group Ltd. + * + * Antoine Ténart + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define BERLIN_RESET_REGISTER 0x104 + +#define to_berlin_reset_priv(p) \ + container_of((p), struct berlin_reset_priv, rcdev) + +struct berlin_reset_priv { + spinlock_t lock; + void __iomem *base; + struct reset_controller_dev rcdev; +}; + +static int berlin_reset_reset(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct berlin_reset_priv *priv = to_berlin_reset_priv(rcdev); + unsigned long flags; + int bank = id / BITS_PER_LONG; + int offset = id % BITS_PER_LONG; + + spin_lock_irqsave(&priv->lock, flags); + + writel(BIT(offset), priv->base + bank * 4); + + spin_unlock_irqrestore(&priv->lock, flags); + + /* let the reset be effective */ + udelay(10); + + return 0; +} + +static struct reset_control_ops berlin_reset_ops = { + .reset = berlin_reset_reset, +}; + +static int __berlin_reset_init(struct device_node *np) +{ + struct berlin_reset_priv *priv; + struct resource res; + resource_size_t size; + int ret; + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + ret = of_address_to_resource(np, 0, &res); + if (ret) + goto err; + + size = resource_size(&res); + + priv->base = ioremap(res.start, size); + if (!priv->base) { + ret = -ENOMEM; + goto err; + } + priv->base += BERLIN_RESET_REGISTER; + + priv->rcdev.owner = THIS_MODULE; + priv->rcdev.nr_resets = size * 32; + priv->rcdev.ops = &berlin_reset_ops; + priv->rcdev.of_node = np; + + reset_controller_register(&priv->rcdev); + + return 0; + +err: + kfree(priv); + return ret; +} + +static const struct of_device_id berlin_reset_of_match[] __initdata = { + { .compatible = "marvell,berlin2q-chip-ctrl" }, + { }, +}; + +static int __init berlin_reset_init(void) +{ + struct device_node *np; + int ret; + + for_each_matching_node(np, berlin_reset_of_match) { + ret = __berlin_reset_init(np); + if (ret) + return ret; + } + + return 0; +} +arch_initcall(berlin_reset_init);