diff options
Diffstat (limited to 'drivers/hwtracing/coresight/coresight-dynamic-replicator.c')
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-dynamic-replicator.c | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/drivers/hwtracing/coresight/coresight-dynamic-replicator.c b/drivers/hwtracing/coresight/coresight-dynamic-replicator.c new file mode 100644 index 000000000000..accc2056f7c6 --- /dev/null +++ b/drivers/hwtracing/coresight/coresight-dynamic-replicator.c @@ -0,0 +1,222 @@ +/* + * Copyright (c) 2011-2015, 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/amba/bus.h> +#include <linux/clk.h> +#include <linux/coresight.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/init.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/of.h> +#include <linux/pm_runtime.h> +#include <linux/slab.h> + +#include "coresight-priv.h" + +#define REPLICATOR_IDFILTER0 0x000 +#define REPLICATOR_IDFILTER1 0x004 + +/** + * struct replicator_state - specifics associated to a replicator component + * @base: memory mapped base address for this component. + * @dev: the device entity associated with this component + * @atclk: optional clock for the core parts of the replicator. + * @csdev: component vitals needed by the framework + */ +struct replicator_state { + void __iomem *base; + struct device *dev; + struct clk *atclk; + struct coresight_device *csdev; +}; + +static int replicator_enable(struct coresight_device *csdev, int inport, + int outport) +{ + struct replicator_state *drvdata = dev_get_drvdata(csdev->dev.parent); + + CS_UNLOCK(drvdata->base); + + /* + * Ensure that the other port is disabled + * 0x00 - passing through the replicator unimpeded + * 0xff - disable (or impede) the flow of ATB data + */ + if (outport == 0) { + writel_relaxed(0x00, drvdata->base + REPLICATOR_IDFILTER0); + writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1); + } else { + writel_relaxed(0x00, drvdata->base + REPLICATOR_IDFILTER1); + writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0); + } + + CS_LOCK(drvdata->base); + + dev_info(drvdata->dev, "REPLICATOR enabled\n"); + return 0; +} + +static void replicator_disable(struct coresight_device *csdev, int inport, + int outport) +{ + struct replicator_state *drvdata = dev_get_drvdata(csdev->dev.parent); + + CS_UNLOCK(drvdata->base); + + /* disable the flow of ATB data through port */ + if (outport == 0) + writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0); + else + writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1); + + CS_LOCK(drvdata->base); + + dev_info(drvdata->dev, "REPLICATOR disabled\n"); +} + +static const struct coresight_ops_link replicator_link_ops = { + .enable = replicator_enable, + .disable = replicator_disable, +}; + +static const struct coresight_ops replicator_cs_ops = { + .link_ops = &replicator_link_ops, +}; + +#define coresight_replicator_reg(name, offset) \ + coresight_simple_reg32(struct replicator_state, name, offset) + +coresight_replicator_reg(idfilter0, REPLICATOR_IDFILTER0); +coresight_replicator_reg(idfilter1, REPLICATOR_IDFILTER1); + +static struct attribute *replicator_mgmt_attrs[] = { + &dev_attr_idfilter0.attr, + &dev_attr_idfilter1.attr, + NULL, +}; + +static const struct attribute_group replicator_mgmt_group = { + .attrs = replicator_mgmt_attrs, + .name = "mgmt", +}; + +static const struct attribute_group *replicator_groups[] = { + &replicator_mgmt_group, + NULL, +}; + +static int replicator_probe(struct amba_device *adev, const struct amba_id *id) +{ + int ret; + struct device *dev = &adev->dev; + struct resource *res = &adev->res; + struct coresight_platform_data *pdata = NULL; + struct replicator_state *drvdata; + struct coresight_desc desc = { 0 }; + struct device_node *np = adev->dev.of_node; + void __iomem *base; + + 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; + drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */ + if (!IS_ERR(drvdata->atclk)) { + ret = clk_prepare_enable(drvdata->atclk); + if (ret) + return ret; + } + + /* 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; + dev_set_drvdata(dev, drvdata); + pm_runtime_put(&adev->dev); + + desc.type = CORESIGHT_DEV_TYPE_LINK; + desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT; + desc.ops = &replicator_cs_ops; + desc.pdata = adev->dev.platform_data; + desc.dev = &adev->dev; + desc.groups = replicator_groups; + drvdata->csdev = coresight_register(&desc); + if (IS_ERR(drvdata->csdev)) + return PTR_ERR(drvdata->csdev); + + return 0; +} + +#ifdef CONFIG_PM +static int replicator_runtime_suspend(struct device *dev) +{ + struct replicator_state *drvdata = dev_get_drvdata(dev); + + if (drvdata && !IS_ERR(drvdata->atclk)) + clk_disable_unprepare(drvdata->atclk); + + return 0; +} + +static int replicator_runtime_resume(struct device *dev) +{ + struct replicator_state *drvdata = dev_get_drvdata(dev); + + if (drvdata && !IS_ERR(drvdata->atclk)) + clk_prepare_enable(drvdata->atclk); + + return 0; +} +#endif + +static const struct dev_pm_ops replicator_dev_pm_ops = { + SET_RUNTIME_PM_OPS(replicator_runtime_suspend, + replicator_runtime_resume, + NULL) +}; + +static const struct amba_id replicator_ids[] = { + { + .id = 0x0003b909, + .mask = 0x0003ffff, + }, + { + /* Coresight SoC-600 */ + .id = 0x000bb9ec, + .mask = 0x000fffff, + }, + { 0, 0 }, +}; + +static struct amba_driver replicator_driver = { + .drv = { + .name = "coresight-dynamic-replicator", + .pm = &replicator_dev_pm_ops, + .suppress_bind_attrs = true, + }, + .probe = replicator_probe, + .id_table = replicator_ids, +}; +builtin_amba_driver(replicator_driver); |