| /* |
| * Copyright (c) 2011-2015, 2017, 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); |
| |
| pm_runtime_get_sync(drvdata->dev); |
| |
| 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); |
| |
| pm_runtime_put(drvdata->dev); |
| 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, |
| }; |
| |
| 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; |
| drvdata->csdev = coresight_register(&desc); |
| if (IS_ERR(drvdata->csdev)) |
| return PTR_ERR(drvdata->csdev); |
| |
| dev_info(dev, "%s initialized\n", (char *)id->data); |
| 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 struct amba_id replicator_ids[] = { |
| { |
| .id = 0x0003b909, |
| .mask = 0x0003ffff, |
| .data = "REPLICATOR 1.0", |
| }, |
| { 0, 0 }, |
| }; |
| |
| static struct amba_driver replicator_driver = { |
| .drv = { |
| .name = "coresight-replicator-qcom", |
| .pm = &replicator_dev_pm_ops, |
| .suppress_bind_attrs = true, |
| }, |
| .probe = replicator_probe, |
| .id_table = replicator_ids, |
| }; |
| builtin_amba_driver(replicator_driver); |