Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752543AbaFEPsw (ORCPT ); Thu, 5 Jun 2014 11:48:52 -0400 Received: from top.free-electrons.com ([176.31.233.9]:58868 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751866AbaFEPsu (ORCPT ); Thu, 5 Jun 2014 11:48:50 -0400 From: =?UTF-8?q?Antoine=20T=C3=A9nart?= To: sebastian.hesselbarth@gmail.com, p.zabel@pengutronix.de Cc: =?UTF-8?q?Antoine=20T=C3=A9nart?= , alexandre.belloni@free-electrons.com, thomas.petazzoni@free-electrons.com, zmxu@marvell.com, jszhang@marvell.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org 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 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.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); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/