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1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright (c) 2011-2015, The Linux Foundation. All rights reserved.4 *5 * Description: CoreSight Replicator driver6 */7 8#include <linux/acpi.h>9#include <linux/amba/bus.h>10#include <linux/kernel.h>11#include <linux/device.h>12#include <linux/platform_device.h>13#include <linux/io.h>14#include <linux/err.h>15#include <linux/slab.h>16#include <linux/pm_runtime.h>17#include <linux/property.h>18#include <linux/clk.h>19#include <linux/of.h>20#include <linux/coresight.h>21 22#include "coresight-priv.h"23 24#define REPLICATOR_IDFILTER0 0x00025#define REPLICATOR_IDFILTER1 0x00426 27DEFINE_CORESIGHT_DEVLIST(replicator_devs, "replicator");28 29/**30 * struct replicator_drvdata - specifics associated to a replicator component31 * @base: memory mapped base address for this component. Also indicates32 * whether this one is programmable or not.33 * @atclk: optional clock for the core parts of the replicator.34 * @pclk: APB clock if present, otherwise NULL35 * @csdev: component vitals needed by the framework36 * @spinlock: serialize enable/disable operations.37 * @check_idfilter_val: check if the context is lost upon clock removal.38 */39struct replicator_drvdata {40 void __iomem *base;41 struct clk *atclk;42 struct clk *pclk;43 struct coresight_device *csdev;44 spinlock_t spinlock;45 bool check_idfilter_val;46};47 48static void dynamic_replicator_reset(struct replicator_drvdata *drvdata)49{50 struct coresight_device *csdev = drvdata->csdev;51 52 CS_UNLOCK(drvdata->base);53 54 if (!coresight_claim_device_unlocked(csdev)) {55 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);56 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);57 coresight_disclaim_device_unlocked(csdev);58 }59 60 CS_LOCK(drvdata->base);61}62 63/*64 * replicator_reset : Reset the replicator configuration to sane values.65 */66static inline void replicator_reset(struct replicator_drvdata *drvdata)67{68 if (drvdata->base)69 dynamic_replicator_reset(drvdata);70}71 72static int dynamic_replicator_enable(struct replicator_drvdata *drvdata,73 int inport, int outport)74{75 int rc = 0;76 u32 id0val, id1val;77 struct coresight_device *csdev = drvdata->csdev;78 79 CS_UNLOCK(drvdata->base);80 81 id0val = readl_relaxed(drvdata->base + REPLICATOR_IDFILTER0);82 id1val = readl_relaxed(drvdata->base + REPLICATOR_IDFILTER1);83 84 /*85 * Some replicator designs lose context when AMBA clocks are removed,86 * so have a check for this.87 */88 if (drvdata->check_idfilter_val && id0val == 0x0 && id1val == 0x0)89 id0val = id1val = 0xff;90 91 if (id0val == 0xff && id1val == 0xff)92 rc = coresight_claim_device_unlocked(csdev);93 94 if (!rc) {95 switch (outport) {96 case 0:97 id0val = 0x0;98 break;99 case 1:100 id1val = 0x0;101 break;102 default:103 WARN_ON(1);104 rc = -EINVAL;105 }106 }107 108 /* Ensure that the outport is enabled. */109 if (!rc) {110 writel_relaxed(id0val, drvdata->base + REPLICATOR_IDFILTER0);111 writel_relaxed(id1val, drvdata->base + REPLICATOR_IDFILTER1);112 }113 114 CS_LOCK(drvdata->base);115 116 return rc;117}118 119static int replicator_enable(struct coresight_device *csdev,120 struct coresight_connection *in,121 struct coresight_connection *out)122{123 int rc = 0;124 struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);125 unsigned long flags;126 bool first_enable = false;127 128 spin_lock_irqsave(&drvdata->spinlock, flags);129 if (atomic_read(&out->src_refcnt) == 0) {130 if (drvdata->base)131 rc = dynamic_replicator_enable(drvdata, in->dest_port,132 out->src_port);133 if (!rc)134 first_enable = true;135 }136 if (!rc)137 atomic_inc(&out->src_refcnt);138 spin_unlock_irqrestore(&drvdata->spinlock, flags);139 140 if (first_enable)141 dev_dbg(&csdev->dev, "REPLICATOR enabled\n");142 return rc;143}144 145static void dynamic_replicator_disable(struct replicator_drvdata *drvdata,146 int inport, int outport)147{148 u32 reg;149 struct coresight_device *csdev = drvdata->csdev;150 151 switch (outport) {152 case 0:153 reg = REPLICATOR_IDFILTER0;154 break;155 case 1:156 reg = REPLICATOR_IDFILTER1;157 break;158 default:159 WARN_ON(1);160 return;161 }162 163 CS_UNLOCK(drvdata->base);164 165 /* disable the flow of ATB data through port */166 writel_relaxed(0xff, drvdata->base + reg);167 168 if ((readl_relaxed(drvdata->base + REPLICATOR_IDFILTER0) == 0xff) &&169 (readl_relaxed(drvdata->base + REPLICATOR_IDFILTER1) == 0xff))170 coresight_disclaim_device_unlocked(csdev);171 CS_LOCK(drvdata->base);172}173 174static void replicator_disable(struct coresight_device *csdev,175 struct coresight_connection *in,176 struct coresight_connection *out)177{178 struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);179 unsigned long flags;180 bool last_disable = false;181 182 spin_lock_irqsave(&drvdata->spinlock, flags);183 if (atomic_dec_return(&out->src_refcnt) == 0) {184 if (drvdata->base)185 dynamic_replicator_disable(drvdata, in->dest_port,186 out->src_port);187 last_disable = true;188 }189 spin_unlock_irqrestore(&drvdata->spinlock, flags);190 191 if (last_disable)192 dev_dbg(&csdev->dev, "REPLICATOR disabled\n");193}194 195static const struct coresight_ops_link replicator_link_ops = {196 .enable = replicator_enable,197 .disable = replicator_disable,198};199 200static const struct coresight_ops replicator_cs_ops = {201 .link_ops = &replicator_link_ops,202};203 204static struct attribute *replicator_mgmt_attrs[] = {205 coresight_simple_reg32(idfilter0, REPLICATOR_IDFILTER0),206 coresight_simple_reg32(idfilter1, REPLICATOR_IDFILTER1),207 NULL,208};209 210static const struct attribute_group replicator_mgmt_group = {211 .attrs = replicator_mgmt_attrs,212 .name = "mgmt",213};214 215static const struct attribute_group *replicator_groups[] = {216 &replicator_mgmt_group,217 NULL,218};219 220static int replicator_probe(struct device *dev, struct resource *res)221{222 int ret = 0;223 struct coresight_platform_data *pdata = NULL;224 struct replicator_drvdata *drvdata;225 struct coresight_desc desc = { 0 };226 void __iomem *base;227 228 if (is_of_node(dev_fwnode(dev)) &&229 of_device_is_compatible(dev->of_node, "arm,coresight-replicator"))230 dev_warn_once(dev,231 "Uses OBSOLETE CoreSight replicator binding\n");232 233 desc.name = coresight_alloc_device_name(&replicator_devs, dev);234 if (!desc.name)235 return -ENOMEM;236 237 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);238 if (!drvdata)239 return -ENOMEM;240 241 drvdata->atclk = devm_clk_get(dev, "atclk"); /* optional */242 if (!IS_ERR(drvdata->atclk)) {243 ret = clk_prepare_enable(drvdata->atclk);244 if (ret)245 return ret;246 }247 248 drvdata->pclk = coresight_get_enable_apb_pclk(dev);249 if (IS_ERR(drvdata->pclk))250 return -ENODEV;251 252 /*253 * Map the device base for dynamic-replicator, which has been254 * validated by AMBA core255 */256 if (res) {257 base = devm_ioremap_resource(dev, res);258 if (IS_ERR(base)) {259 ret = PTR_ERR(base);260 goto out_disable_clk;261 }262 drvdata->base = base;263 desc.groups = replicator_groups;264 desc.access = CSDEV_ACCESS_IOMEM(base);265 }266 267 if (fwnode_property_present(dev_fwnode(dev),268 "qcom,replicator-loses-context"))269 drvdata->check_idfilter_val = true;270 271 dev_set_drvdata(dev, drvdata);272 273 pdata = coresight_get_platform_data(dev);274 if (IS_ERR(pdata)) {275 ret = PTR_ERR(pdata);276 goto out_disable_clk;277 }278 dev->platform_data = pdata;279 280 spin_lock_init(&drvdata->spinlock);281 desc.type = CORESIGHT_DEV_TYPE_LINK;282 desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT;283 desc.ops = &replicator_cs_ops;284 desc.pdata = dev->platform_data;285 desc.dev = dev;286 287 drvdata->csdev = coresight_register(&desc);288 if (IS_ERR(drvdata->csdev)) {289 ret = PTR_ERR(drvdata->csdev);290 goto out_disable_clk;291 }292 293 replicator_reset(drvdata);294 295out_disable_clk:296 if (ret && !IS_ERR_OR_NULL(drvdata->atclk))297 clk_disable_unprepare(drvdata->atclk);298 if (ret && !IS_ERR_OR_NULL(drvdata->pclk))299 clk_disable_unprepare(drvdata->pclk);300 return ret;301}302 303static int replicator_remove(struct device *dev)304{305 struct replicator_drvdata *drvdata = dev_get_drvdata(dev);306 307 coresight_unregister(drvdata->csdev);308 return 0;309}310 311static int replicator_platform_probe(struct platform_device *pdev)312{313 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);314 int ret;315 316 pm_runtime_get_noresume(&pdev->dev);317 pm_runtime_set_active(&pdev->dev);318 pm_runtime_enable(&pdev->dev);319 320 ret = replicator_probe(&pdev->dev, res);321 pm_runtime_put(&pdev->dev);322 if (ret)323 pm_runtime_disable(&pdev->dev);324 325 return ret;326}327 328static void replicator_platform_remove(struct platform_device *pdev)329{330 struct replicator_drvdata *drvdata = dev_get_drvdata(&pdev->dev);331 332 if (WARN_ON(!drvdata))333 return;334 335 replicator_remove(&pdev->dev);336 pm_runtime_disable(&pdev->dev);337 if (!IS_ERR_OR_NULL(drvdata->pclk))338 clk_put(drvdata->pclk);339}340 341#ifdef CONFIG_PM342static int replicator_runtime_suspend(struct device *dev)343{344 struct replicator_drvdata *drvdata = dev_get_drvdata(dev);345 346 if (drvdata && !IS_ERR(drvdata->atclk))347 clk_disable_unprepare(drvdata->atclk);348 349 if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk))350 clk_disable_unprepare(drvdata->pclk);351 return 0;352}353 354static int replicator_runtime_resume(struct device *dev)355{356 struct replicator_drvdata *drvdata = dev_get_drvdata(dev);357 358 if (drvdata && !IS_ERR(drvdata->atclk))359 clk_prepare_enable(drvdata->atclk);360 361 if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk))362 clk_prepare_enable(drvdata->pclk);363 return 0;364}365#endif366 367static const struct dev_pm_ops replicator_dev_pm_ops = {368 SET_RUNTIME_PM_OPS(replicator_runtime_suspend,369 replicator_runtime_resume, NULL)370};371 372static const struct of_device_id replicator_match[] = {373 {.compatible = "arm,coresight-replicator"},374 {.compatible = "arm,coresight-static-replicator"},375 {}376};377 378MODULE_DEVICE_TABLE(of, replicator_match);379 380#ifdef CONFIG_ACPI381static const struct acpi_device_id replicator_acpi_ids[] = {382 {"ARMHC985", 0, 0, 0}, /* ARM CoreSight Static Replicator */383 {"ARMHC98D", 0, 0, 0}, /* ARM CoreSight Dynamic Replicator */384 {}385};386 387MODULE_DEVICE_TABLE(acpi, replicator_acpi_ids);388#endif389 390static struct platform_driver replicator_driver = {391 .probe = replicator_platform_probe,392 .remove_new = replicator_platform_remove,393 .driver = {394 .name = "coresight-replicator",395 /* THIS_MODULE is taken care of by platform_driver_register() */396 .of_match_table = of_match_ptr(replicator_match),397 .acpi_match_table = ACPI_PTR(replicator_acpi_ids),398 .pm = &replicator_dev_pm_ops,399 .suppress_bind_attrs = true,400 },401};402 403static int dynamic_replicator_probe(struct amba_device *adev,404 const struct amba_id *id)405{406 int ret;407 408 ret = replicator_probe(&adev->dev, &adev->res);409 if (!ret)410 pm_runtime_put(&adev->dev);411 412 return ret;413}414 415static void dynamic_replicator_remove(struct amba_device *adev)416{417 replicator_remove(&adev->dev);418}419 420static const struct amba_id dynamic_replicator_ids[] = {421 CS_AMBA_ID(0x000bb909),422 CS_AMBA_ID(0x000bb9ec), /* Coresight SoC-600 */423 {},424};425 426MODULE_DEVICE_TABLE(amba, dynamic_replicator_ids);427 428static struct amba_driver dynamic_replicator_driver = {429 .drv = {430 .name = "coresight-dynamic-replicator",431 .pm = &replicator_dev_pm_ops,432 .suppress_bind_attrs = true,433 },434 .probe = dynamic_replicator_probe,435 .remove = dynamic_replicator_remove,436 .id_table = dynamic_replicator_ids,437};438 439static int __init replicator_init(void)440{441 return coresight_init_driver("replicator", &dynamic_replicator_driver, &replicator_driver);442}443 444static void __exit replicator_exit(void)445{446 coresight_remove_driver(&dynamic_replicator_driver, &replicator_driver);447}448 449module_init(replicator_init);450module_exit(replicator_exit);451 452MODULE_AUTHOR("Pratik Patel <pratikp@codeaurora.org>");453MODULE_AUTHOR("Mathieu Poirier <mathieu.poirier@linaro.org>");454MODULE_DESCRIPTION("Arm CoreSight Replicator Driver");455MODULE_LICENSE("GPL v2");456