From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933402AbaE3NqM (ORCPT ); Fri, 30 May 2014 09:46:12 -0400 Received: from mail-pd0-f170.google.com ([209.85.192.170]:63585 "EHLO mail-pd0-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933235AbaE3Nnx (ORCPT ); Fri, 30 May 2014 09:43:53 -0400 From: mathieu.poirier@linaro.org To: linus.walleij@linaro.org, will.deacon@arm.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, patches@linaro.org, linux@arm.linux.org.uk, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, daniel.thompson@linaro.org Subject: [RFC PATCH 05/11] coresight: add CoreSight Funnel driver Date: Fri, 30 May 2014 07:43:05 -0600 Message-Id: <1401457391-12242-6-git-send-email-mathieu.poirier@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1401457391-12242-1-git-send-email-mathieu.poirier@linaro.org> References: <1401457391-12242-1-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 | 310 +++++++++++++++++++++++++++++++++++ 2 files changed, 311 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..c1024df --- /dev/null +++ b/drivers/coresight/coresight-funnel.c @@ -0,0 +1,310 @@ +/* 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 + +#include "coresight-priv.h" + +#define funnel_writel(drvdata, val, off) \ + __raw_writel((val), drvdata->base + off) +#define funnel_readl(drvdata, off) \ + __raw_readl(drvdata->base + off) + +#define FUNNEL_LOCK(drvdata) \ +do { \ + /* wait for things to settle */ \ + mb(); \ + funnel_writel(drvdata, 0x0, CORESIGHT_LAR); \ +} while (0) +#define FUNNEL_UNLOCK(drvdata) \ +do { \ + funnel_writel(drvdata, CORESIGHT_UNLOCK, CORESIGHT_LAR); \ + /* make sure everyone has seen this */ \ + mb(); \ +} while (0) + +#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; + uint32_t priority; +}; + +static void __funnel_enable(struct funnel_drvdata *drvdata, int port) +{ + uint32_t functl; + + FUNNEL_UNLOCK(drvdata); + + functl = funnel_readl(drvdata, FUNNEL_FUNCTL); + functl &= ~FUNNEL_HOLDTIME_MASK; + functl |= FUNNEL_HOLDTIME; + functl |= (1 << port); + funnel_writel(drvdata, functl, FUNNEL_FUNCTL); + funnel_writel(drvdata, drvdata->priority, FUNNEL_PRICTL); + + FUNNEL_LOCK(drvdata); +} + +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(drvdata, inport); + + dev_info(drvdata->dev, "FUNNEL inport %d enabled\n", inport); + return 0; +} + +static void __funnel_disable(struct funnel_drvdata *drvdata, int inport) +{ + uint32_t functl; + + FUNNEL_UNLOCK(drvdata); + + functl = funnel_readl(drvdata, FUNNEL_FUNCTL); + functl &= ~(1 << inport); + funnel_writel(drvdata, functl, FUNNEL_FUNCTL); + + FUNNEL_LOCK(drvdata); +} + +static void funnel_disable(struct coresight_device *csdev, int inport, + int outport) +{ + struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + + __funnel_disable(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_show_funnel_priority(struct file *file, + char __user *user_buf, + size_t count, loff_t *ppos) +{ + int ret; + unsigned long val; + char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); + struct funnel_drvdata *drvdata = file->private_data; + + val = drvdata->priority; + ret = scnprintf(buf, PAGE_SIZE, "%#lx\n", val); + ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); + + kfree(buf); + return ret; +} + +static ssize_t debugfs_store_funnel_priority(struct file *file, + const char __user *user_buf, + size_t count, loff_t *ppos) +{ + unsigned long val; + struct funnel_drvdata *drvdata = file->private_data; + + if (sscanf(user_buf, "%lx", &val) != 1) + return -EINVAL; + + drvdata->priority = val; + return count; +} + +static const struct file_operations debugfs_funnel_priority_ops = { + .open = simple_open, + .read = debugfs_show_funnel_priority, + .write = debugfs_store_funnel_priority, +}; + +static const struct coresight_ops_entry debugfs_funnel_priority_entry = { + .name = "priority", + .mode = S_IRUGO | S_IWUSR, + .ops = &debugfs_funnel_priority_ops, +}; + +static uint32_t __get_funnel_ctrl(struct funnel_drvdata *drvdata) +{ + uint32_t functl; + + FUNNEL_UNLOCK(drvdata); + functl = funnel_readl(drvdata, FUNNEL_FUNCTL); + FUNNEL_LOCK(drvdata); + + return functl; +} + +static ssize_t debugfs_show_funnel_ctrl(struct file *file, + char __user *user_buf, + size_t count, loff_t *ppos) +{ + int ret; + unsigned long val; + struct funnel_drvdata *drvdata = file->private_data; + char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); + + ret = clk_prepare_enable(drvdata->clk); + if (ret) + goto out; + + val = __get_funnel_ctrl(drvdata); + + clk_disable_unprepare(drvdata->clk); + + ret = scnprintf(buf, PAGE_SIZE, "%#lx\n", val); + ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); + +out: + kfree(buf); + return ret; +} + +static const struct file_operations debugfs_funnel_ctrl_ops = { + .open = simple_open, + .read = debugfs_show_funnel_ctrl, +}; + +static const struct coresight_ops_entry debugfs_funnel_ctrl_entry = { + .name = "funnel_ctrl", + .mode = S_IRUGO, + .ops = &debugfs_funnel_ctrl_ops, +}; + +static const struct coresight_ops_entry *funnel_attr_grps[] = { + &debugfs_funnel_priority_entry, + &debugfs_funnel_ctrl_entry, + NULL, +}; + +static int funnel_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct coresight_platform_data *pdata = NULL; + struct funnel_drvdata *drvdata; + struct resource *res; + struct coresight_desc *desc; + + if (pdev->dev.of_node) { + pdata = of_get_coresight_platform_data(dev, pdev->dev.of_node); + if (IS_ERR(pdata)) + return PTR_ERR(pdata); + pdev->dev.platform_data = pdata; + } + + drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); + if (!drvdata) + return -ENOMEM; + drvdata->dev = &pdev->dev; + platform_set_drvdata(pdev, drvdata); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -ENODEV; + + drvdata->base = devm_ioremap(dev, res->start, resource_size(res)); + if (!drvdata->base) + return -ENOMEM; + + if (pdata && pdata->clk) + drvdata->clk = pdata->clk; + + 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 = pdev->dev.platform_data; + desc->dev = &pdev->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 platform_device *pdev) +{ + struct funnel_drvdata *drvdata = platform_get_drvdata(pdev); + + coresight_unregister(drvdata->csdev); + return 0; +} + +static struct of_device_id funnel_match[] = { + {.compatible = "arm,coresight-funnel"}, + {} +}; + +static struct platform_driver funnel_driver = { + .probe = funnel_probe, + .remove = funnel_remove, + .driver = { + .name = "coresight-funnel", + .owner = THIS_MODULE, + .of_match_table = funnel_match, + }, +}; + +static int __init funnel_init(void) +{ + return platform_driver_register(&funnel_driver); +} +module_init(funnel_init); + +static void __exit funnel_exit(void) +{ + platform_driver_unregister(&funnel_driver); +} +module_exit(funnel_exit); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("CoreSight Funnel driver"); -- 1.9.1