Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752924AbaF0SGK (ORCPT ); Fri, 27 Jun 2014 14:06:10 -0400 Received: from mail-pa0-f50.google.com ([209.85.220.50]:47634 "EHLO mail-pa0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752210AbaF0SEp (ORCPT ); Fri, 27 Jun 2014 14:04:45 -0400 From: mathieu.poirier@linaro.org To: linus.walleij@linaro.org, will.deacon@arm.com, linux@arm.linux.org.uk, daniel.thompson@linaro.org, robherring2@gmail.com Cc: mathieu.poirier@linaro.org, arve@android.com, john.stultz@linaro.org, pratikp@codeaurora.org, varshney@ti.com, Al.Grant@arm.com, jonas.svennebring@avagotech.com, james.king@linaro.org, panchaxari.prasannamurthy@linaro.org, arnd@linaro.org, marcin.jabrzyk@gmail.com, r.sengupta@samsung.com, robbelibobban@gmail.com, Tony.Armitstead@arm.com, patches@linaro.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH 5/9 v2] coresight-funnel: add CoreSight Funnel driver Date: Fri, 27 Jun 2014 12:04:17 -0600 Message-Id: <1403892261-25026-6-git-send-email-mathieu.poirier@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1403892261-25026-1-git-send-email-mathieu.poirier@linaro.org> References: <1403892261-25026-1-git-send-email-mathieu.poirier@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Pratik Patel This driver manages CoreSight Funnel which acts as a link. Funnels have multiple input ports (typically 8) each of which represents an input trace data stream. These multiple input trace data streams are interleaved into a single output stream coming out of the Funnel. Signed-off-by: Pratik Patel Signed-off-by: Panchaxari Prasannamurthy Signed-off-by: Mathieu Poirier --- drivers/coresight/Makefile | 2 +- drivers/coresight/coresight-funnel.c | 252 +++++++++++++++++++++++++++++++++++ 2 files changed, 253 insertions(+), 1 deletion(-) create mode 100644 drivers/coresight/coresight-funnel.c diff --git a/drivers/coresight/Makefile b/drivers/coresight/Makefile index 8d4443b..1f66804 100644 --- a/drivers/coresight/Makefile +++ b/drivers/coresight/Makefile @@ -4,4 +4,4 @@ obj-$(CONFIG_CORESIGHT) += coresight.o obj-$(CONFIG_OF) += of_coresight.o obj-$(CONFIG_CORESIGHT_LINKS_AND_SINKS) += coresight-tmc.o coresight-tpiu.o \ - coresight-etb.o + coresight-etb.o coresight-funnel.o diff --git a/drivers/coresight/coresight-funnel.c b/drivers/coresight/coresight-funnel.c new file mode 100644 index 0000000..62c5fec --- /dev/null +++ b/drivers/coresight/coresight-funnel.c @@ -0,0 +1,252 @@ +/* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "coresight-priv.h" + +#define FUNNEL_FUNCTL (0x000) +#define FUNNEL_PRICTL (0x004) + +#define FUNNEL_HOLDTIME_MASK (0xF00) +#define FUNNEL_HOLDTIME_SHFT (0x8) +#define FUNNEL_HOLDTIME (0x7 << FUNNEL_HOLDTIME_SHFT) + +struct funnel_drvdata { + void __iomem *base; + struct device *dev; + struct coresight_device *csdev; + struct clk *clk; + u32 priority; +}; + +static void funnel_enable_hw(struct funnel_drvdata *drvdata, int port) +{ + u32 functl; + + CS_UNLOCK(drvdata->base); + + functl = cs_readl(drvdata->base, FUNNEL_FUNCTL); + functl &= ~FUNNEL_HOLDTIME_MASK; + functl |= FUNNEL_HOLDTIME; + functl |= (1 << port); + cs_writel(drvdata->base, functl, FUNNEL_FUNCTL); + cs_writel(drvdata->base, drvdata->priority, FUNNEL_PRICTL); + + CS_LOCK(drvdata->base); +} + +static int funnel_enable(struct coresight_device *csdev, int inport, + int outport) +{ + struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + int ret; + + ret = clk_prepare_enable(drvdata->clk); + if (ret) + return ret; + + funnel_enable_hw(drvdata, inport); + + dev_info(drvdata->dev, "FUNNEL inport %d enabled\n", inport); + return 0; +} + +static void funnel_disable_hw(struct funnel_drvdata *drvdata, int inport) +{ + u32 functl; + + CS_UNLOCK(drvdata->base); + + functl = cs_readl(drvdata->base, FUNNEL_FUNCTL); + functl &= ~(1 << inport); + cs_writel(drvdata->base, functl, FUNNEL_FUNCTL); + + CS_LOCK(drvdata->base); +} + +static void funnel_disable(struct coresight_device *csdev, int inport, + int outport) +{ + struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + + funnel_disable_hw(drvdata, inport); + + clk_disable_unprepare(drvdata->clk); + + dev_info(drvdata->dev, "FUNNEL inport %d disabled\n", inport); +} + +static const struct coresight_ops_link funnel_link_ops = { + .enable = funnel_enable, + .disable = funnel_disable, +}; + +static const struct coresight_ops funnel_cs_ops = { + .link_ops = &funnel_link_ops, +}; + +static ssize_t debugfs_funnel_priority_get(void *data, u64 *val) +{ + struct funnel_drvdata *drvdata = data; + + *val = drvdata->priority; + return 0; +} + +static ssize_t debugfs_funnel_priority_set(void *data, u64 val) +{ + struct funnel_drvdata *drvdata = data; + + drvdata->priority = val; + return 0; +} +CORESIGHT_DEBUGFS_ENTRY(debugfs_funnel_priority, "priority", + S_IRUGO | S_IWUSR, debugfs_funnel_priority_get, + debugfs_funnel_priority_set, "%llu\n"); + +static u32 get_funnel_ctrl_hw(struct funnel_drvdata *drvdata) +{ + u32 functl; + + CS_UNLOCK(drvdata->base); + functl = cs_readl(drvdata->base, FUNNEL_FUNCTL); + CS_LOCK(drvdata->base); + + return functl; +} + +static ssize_t debugfs_funnel_ctrl_get(void *data, u64 *val) +{ + struct funnel_drvdata *drvdata = data; + + if (clk_prepare_enable(drvdata->clk)) + goto out; + + *val = get_funnel_ctrl_hw(drvdata); + clk_disable_unprepare(drvdata->clk); +out: + return 0; +} +CORESIGHT_DEBUGFS_ENTRY(debugfs_funnel_ctrl, "funnel_ctrl", + S_IRUGO, debugfs_funnel_ctrl_get, + NULL, "%llu\n"); + +static const struct coresight_ops_entry *funnel_attr_grps[] = { + &debugfs_funnel_priority_entry, + &debugfs_funnel_ctrl_entry, + NULL, +}; + +static int funnel_probe(struct amba_device *adev, const struct amba_id *id) +{ + void __iomem *base; + struct device *dev = &adev->dev; + struct coresight_platform_data *pdata = NULL; + struct funnel_drvdata *drvdata; + struct resource *res = &adev->res; + struct coresight_desc *desc; + struct device_node *np = adev->dev.of_node; + + if (np) { + pdata = of_get_coresight_platform_data(dev, np); + if (IS_ERR(pdata)) + return PTR_ERR(pdata); + adev->dev.platform_data = pdata; + } + + drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); + if (!drvdata) + return -ENOMEM; + + drvdata->dev = &adev->dev; + dev_set_drvdata(dev, drvdata); + + /* validity for the resource is already checked by the AMBA core */ + base = devm_ioremap_resource(dev, res); + if (IS_ERR(base)) + return PTR_ERR(base); + + drvdata->base = base; + + drvdata->clk = adev->pclk; + + desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL); + if (!desc) + return -ENOMEM; + + desc->type = CORESIGHT_DEV_TYPE_LINK; + desc->subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG; + desc->ops = &funnel_cs_ops; + desc->pdata = pdata; + desc->dev = dev; + desc->debugfs_ops = funnel_attr_grps; + desc->owner = THIS_MODULE; + drvdata->csdev = coresight_register(desc); + if (IS_ERR(drvdata->csdev)) + return PTR_ERR(drvdata->csdev); + + dev_info(dev, "FUNNEL initialized\n"); + return 0; +} + +static int funnel_remove(struct amba_device *adev) +{ + struct funnel_drvdata *drvdata = amba_get_drvdata(adev); + + coresight_unregister(drvdata->csdev); + return 0; +} + +static struct amba_id funnel_ids[] = { + { + .id = 0x0003b908, + .mask = 0x0003ffff, + }, + { 0, 0}, +}; + +static struct amba_driver funnel_driver = { + .drv = { + .name = "coresight-funnel", + .owner = THIS_MODULE, + }, + .probe = funnel_probe, + .remove = funnel_remove, + .id_table = funnel_ids, +}; + +static int __init funnel_init(void) +{ + return amba_driver_register(&funnel_driver); +} +module_init(funnel_init); + +static void __exit funnel_exit(void) +{ + amba_driver_unregister(&funnel_driver); +} +module_exit(funnel_exit); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("CoreSight Funnel driver"); -- 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/