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[70.73.24.112]) by mx.google.com with ESMTPSA id cw5sm9961925pbc.9.2014.10.20.14.09.06 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 20 Oct 2014 14:09:07 -0700 (PDT) From: mathieu.poirier@linaro.org To: gregkh@linuxfoundation.org Cc: linux@arm.linux.org.uk, pratikp@codeaurora.org, varshney@ti.com, Al.Grant@arm.com, jonas.svennebring@avagotech.com, james.king@linaro.org, kaixu.xia@linaro.org, marcin.jabrzyk@gmail.com, r.sengupta@samsung.com, robbelibobban@gmail.com, patches@linaro.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, mathieu.poirier@linaro.org Subject: [PATCH v8 05/11] coresight-funnel: add CoreSight Funnel driver Date: Mon, 20 Oct 2014 15:08:06 -0600 Message-Id: <1413839292-19135-6-git-send-email-mathieu.poirier@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1413839292-19135-1-git-send-email-mathieu.poirier@linaro.org> References: <1413839292-19135-1-git-send-email-mathieu.poirier@linaro.org> X-Removed-Original-Auth: Dkim didn't pass. X-Original-Sender: mathieu.poirier@linaro.org X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of patch+caf_=patchwork-forward=linaro.org@linaro.org designates 209.85.215.43 as permitted sender) smtp.mail=patch+caf_=patchwork-forward=linaro.org@linaro.org Precedence: list Mailing-list: list patchwork-forward@linaro.org; contact patchwork-forward+owners@linaro.org List-ID: X-Google-Group-Id: 836684582541 List-Post: , List-Help: , List-Archive: List-Unsubscribe: , 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: Mathieu Poirier --- drivers/coresight/Makefile | 1 + drivers/coresight/coresight-funnel.c | 268 +++++++++++++++++++++++++++++++++++ 2 files changed, 269 insertions(+) create mode 100644 drivers/coresight/coresight-funnel.c diff --git a/drivers/coresight/Makefile b/drivers/coresight/Makefile index 4c43dad..05b8a1c 100644 --- a/drivers/coresight/Makefile +++ b/drivers/coresight/Makefile @@ -6,3 +6,4 @@ obj-$(CONFIG_OF) += of_coresight.o obj-$(CONFIG_CORESIGHT_LINK_AND_SINK_TMC) += coresight-tmc.o obj-$(CONFIG_CORESIGHT_SINK_TPIU) += coresight-tpiu.o obj-$(CONFIG_CORESIGHT_SINK_ETBV10) += coresight-etb10.o +obj-$(CONFIG_CORESIGHT_LINKS_AND_SINKS) += coresight-funnel.o diff --git a/drivers/coresight/coresight-funnel.c b/drivers/coresight/coresight-funnel.c new file mode 100644 index 0000000..2108edf --- /dev/null +++ b/drivers/coresight/coresight-funnel.c @@ -0,0 +1,268 @@ +/* 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 "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 - specifics associated to a funnel component + * @base: memory mapped base address for this component. + * @dev: the device entity associated to this component. + * @csdev: component vitals needed by the framework. + * @clk: the clock this component is associated to. + * @priority: port selection order. + */ +struct funnel_drvdata { + void __iomem *base; + struct device *dev; + struct coresight_device *csdev; + struct clk *clk; + unsigned long priority; +}; + +static void funnel_enable_hw(struct funnel_drvdata *drvdata, int port) +{ + u32 functl; + + CS_UNLOCK(drvdata->base); + + functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL); + functl &= ~FUNNEL_HOLDTIME_MASK; + functl |= FUNNEL_HOLDTIME; + functl |= (1 << port); + writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL); + writel_relaxed(drvdata->priority, drvdata->base + 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 = readl_relaxed(drvdata->base + FUNNEL_FUNCTL); + functl &= ~(1 << inport); + writel_relaxed(functl, drvdata->base + 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 priority_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent); + unsigned long val = drvdata->priority; + + return sprintf(buf, "%#lx\n", val); +} + +static ssize_t priority_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t size) +{ + int ret; + unsigned long val; + struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent); + + ret = kstrtoul(buf, 16, &val); + if (ret) + return ret; + + drvdata->priority = val; + return size; +} +static DEVICE_ATTR_RW(priority); + +static u32 get_funnel_ctrl_hw(struct funnel_drvdata *drvdata) +{ + u32 functl; + + CS_UNLOCK(drvdata->base); + functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL); + CS_LOCK(drvdata->base); + + return functl; +} + +static ssize_t funnel_ctrl_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int ret; + u32 val; + struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent); + + ret = clk_prepare_enable(drvdata->clk); + if (ret) + return ret; + + val = get_funnel_ctrl_hw(drvdata); + clk_disable_unprepare(drvdata->clk); + + return sprintf(buf, "%#x\n", val); +} +static DEVICE_ATTR_RO(funnel_ctrl); + +static struct attribute *coresight_funnel_attrs[] = { + &dev_attr_funnel_ctrl.attr, + &dev_attr_priority.attr, + NULL, +}; +ATTRIBUTE_GROUPS(coresight_funnel); + +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->groups = coresight_funnel_groups; + 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");