From: Pratik Patel <prat...@codeaurora.org> This driver manages CoreSight TPIU (Trace Port Interface Unit) which acts as a sink. TPIU is typically connected to some offchip hardware hosting a storage buffer.
Signed-off-by: Pratik Patel <prat...@codeaurora.org> Signed-off-by: Panchaxari Prasannamurthy <panchaxari.prasannamur...@linaro.org> Signed-off-by: Mathieu Poirier <mathieu.poir...@linaro.org> --- drivers/coresight/Makefile | 2 +- drivers/coresight/coresight-tpiu.c | 229 +++++++++++++++++++++++++++++++++++++ 2 files changed, 230 insertions(+), 1 deletion(-) create mode 100644 drivers/coresight/coresight-tpiu.c diff --git a/drivers/coresight/Makefile b/drivers/coresight/Makefile index 16e26c5..540df99 100644 --- a/drivers/coresight/Makefile +++ b/drivers/coresight/Makefile @@ -3,4 +3,4 @@ # obj-$(CONFIG_CORESIGHT) += coresight.o obj-$(CONFIG_OF) += of_coresight.o -obj-$(CONFIG_CORESIGHT_LINKS_AND_SINKS) += coresight-tmc.o +obj-$(CONFIG_CORESIGHT_LINKS_AND_SINKS) += coresight-tmc.o coresight-tpiu.o diff --git a/drivers/coresight/coresight-tpiu.c b/drivers/coresight/coresight-tpiu.c new file mode 100644 index 0000000..b552d1e --- /dev/null +++ b/drivers/coresight/coresight-tpiu.c @@ -0,0 +1,229 @@ +/* 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 <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/device.h> +#include <linux/platform_device.h> +#include <linux/io.h> +#include <linux/err.h> +#include <linux/slab.h> +#include <linux/clk.h> +#include <linux/of_coresight.h> +#include <linux/coresight.h> + +#include "coresight-priv.h" + +#define tpiu_writel(drvdata, val, off) __raw_writel((val), drvdata->base + off) +#define tpiu_readl(drvdata, off) __raw_readl(drvdata->base + off) + +#define TPIU_LOCK(drvdata) \ +do { \ + /* wait for things to settle */ \ + mb(); \ + tpiu_writel(drvdata, 0x0, CORESIGHT_LAR); \ +} while (0) +#define TPIU_UNLOCK(drvdata) \ +do { \ + tpiu_writel(drvdata, CORESIGHT_UNLOCK, CORESIGHT_LAR); \ + /* make sure everyone has seen this */ \ + mb(); \ +} while (0) + +#define TPIU_SUPP_PORTSZ (0x000) +#define TPIU_CURR_PORTSZ (0x004) +#define TPIU_SUPP_TRIGMODES (0x100) +#define TPIU_TRIG_CNTRVAL (0x104) +#define TPIU_TRIG_MULT (0x108) +#define TPIU_SUPP_TESTPATM (0x200) +#define TPIU_CURR_TESTPATM (0x204) +#define TPIU_TEST_PATREPCNTR (0x208) +#define TPIU_FFSR (0x300) +#define TPIU_FFCR (0x304) +#define TPIU_FSYNC_CNTR (0x308) +#define TPIU_EXTCTL_INPORT (0x400) +#define TPIU_EXTCTL_OUTPORT (0x404) +#define TPIU_ITTRFLINACK (0xEE4) +#define TPIU_ITTRFLIN (0xEE8) +#define TPIU_ITATBDATA0 (0xEEC) +#define TPIU_ITATBCTR2 (0xEF0) +#define TPIU_ITATBCTR1 (0xEF4) +#define TPIU_ITATBCTR0 (0xEF8) + +struct tpiu_drvdata { + void __iomem *base; + struct device *dev; + struct coresight_device *csdev; + struct clk *clk; +}; + +static void __tpiu_enable(struct tpiu_drvdata *drvdata) +{ + TPIU_UNLOCK(drvdata); + + /* TODO: fill this up */ + + TPIU_LOCK(drvdata); +} + +static int tpiu_enable(struct coresight_device *csdev) +{ + struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + int ret; + + ret = clk_prepare_enable(drvdata->clk); + if (ret) + return ret; + + __tpiu_enable(drvdata); + + dev_info(drvdata->dev, "TPIU enabled\n"); + return 0; +} + +static void __tpiu_disable(struct tpiu_drvdata *drvdata) +{ + TPIU_UNLOCK(drvdata); + + tpiu_writel(drvdata, 0x3000, TPIU_FFCR); + tpiu_writel(drvdata, 0x3040, TPIU_FFCR); + + TPIU_LOCK(drvdata); +} + +static void tpiu_disable(struct coresight_device *csdev) +{ + struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + + __tpiu_disable(drvdata); + + clk_disable_unprepare(drvdata->clk); + + dev_info(drvdata->dev, "TPIU disabled\n"); +} + +static void tpiu_abort(struct coresight_device *csdev) +{ + struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + + __tpiu_disable(drvdata); + + dev_info(drvdata->dev, "TPIU aborted\n"); +} + +static const struct coresight_ops_sink tpiu_sink_ops = { + .enable = tpiu_enable, + .disable = tpiu_disable, + .abort = tpiu_abort, +}; + +static const struct coresight_ops tpiu_cs_ops = { + .sink_ops = &tpiu_sink_ops, +}; + +static int tpiu_probe(struct platform_device *pdev) +{ + int ret; + struct device *dev = &pdev->dev; + struct coresight_platform_data *pdata = NULL; + struct tpiu_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; + ret = clk_prepare_enable(drvdata->clk); + if (ret) + return ret; + } + + /* Disable tpiu to support older devices */ + __tpiu_disable(drvdata); + + clk_disable_unprepare(drvdata->clk); + + desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL); + if (!desc) + return -ENOMEM; + desc->type = CORESIGHT_DEV_TYPE_SINK; + desc->subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_PORT; + desc->ops = &tpiu_cs_ops; + desc->pdata = pdev->dev.platform_data; + desc->dev = &pdev->dev; + desc->owner = THIS_MODULE; + drvdata->csdev = coresight_register(desc); + if (IS_ERR(drvdata->csdev)) + return PTR_ERR(drvdata->csdev); + + dev_info(dev, "TPIU initialized\n"); + return 0; +} + +static int tpiu_remove(struct platform_device *pdev) +{ + struct tpiu_drvdata *drvdata = platform_get_drvdata(pdev); + + coresight_unregister(drvdata->csdev); + return 0; +} + +static struct of_device_id tpiu_match[] = { + {.compatible = "arm,coresight-tpiu"}, + {} +}; + +static struct platform_driver tpiu_driver = { + .probe = tpiu_probe, + .remove = tpiu_remove, + .driver = { + .name = "coresight-tpiu", + .owner = THIS_MODULE, + .of_match_table = tpiu_match, + }, +}; + +static int __init tpiu_init(void) +{ + return platform_driver_register(&tpiu_driver); +} +module_init(tpiu_init); + +static void __exit tpiu_exit(void) +{ + platform_driver_unregister(&tpiu_driver); +} +module_exit(tpiu_exit); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("CoreSight Trace Port Interface Unit driver"); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/