drivers/hwtracing/coresight/coresight-funnel.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
   4  *
   5  * Description: CoreSight Funnel driver
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/init.h>
  10 #include <linux/types.h>
  11 #include <linux/device.h>
  12 #include <linux/err.h>
  13 #include <linux/fs.h>
  14 #include <linux/slab.h>
  15 #include <linux/of.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/pm_runtime.h>
  18 #include <linux/coresight.h>
  19 #include <linux/amba/bus.h>
  20 #include <linux/clk.h>
  21
  22 #include "coresight-priv.h"
  23
  24 #define FUNNEL_FUNCTL           0x000
  25 #define FUNNEL_PRICTL           0x004
  26
  27 #define FUNNEL_HOLDTIME_MASK    0xf00
  28 #define FUNNEL_HOLDTIME_SHFT    0x8
  29 #define FUNNEL_HOLDTIME         (0x7 << FUNNEL_HOLDTIME_SHFT)
  30 #define FUNNEL_ENSx_MASK        0xff
  31
  32 /**
  33  * struct funnel_drvdata - specifics associated to a funnel component
  34  * @base:       memory mapped base address for this component.
  35  * @dev:        the device entity associated to this component.
  36  * @atclk:      optional clock for the core parts of the funnel.
  37  * @csdev:      component vitals needed by the framework.
  38  * @priority:   port selection order.
  39  */
  40 struct funnel_drvdata {
  41         void __iomem            *base;
  42         struct device           *dev;
  43         struct clk              *atclk;
  44         struct coresight_device *csdev;
  45         unsigned long           priority;
  46 };
  47
  48 static int dynamic_funnel_enable_hw(struct funnel_drvdata *drvdata, int port)
  49 {
  50         u32 functl;
  51         int rc = 0;
  52
  53         CS_UNLOCK(drvdata->base);
  54
  55         functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
  56         /* Claim the device only when we enable the first slave */
  57         if (!(functl & FUNNEL_ENSx_MASK)) {
  58                 rc = coresight_claim_device_unlocked(drvdata->base);
  59                 if (rc)
  60                         goto done;
  61         }
  62
  63         functl &= ~FUNNEL_HOLDTIME_MASK;
  64         functl |= FUNNEL_HOLDTIME;
  65         functl |= (1 << port);
  66         writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
  67         writel_relaxed(drvdata->priority, drvdata->base + FUNNEL_PRICTL);
  68 done:
  69         CS_LOCK(drvdata->base);
  70         return rc;
  71 }
  72
  73 static int funnel_enable(struct coresight_device *csdev, int inport,
  74                          int outport)
  75 {
  76         int rc = 0;
  77         struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
  78
  79         if (drvdata->base)
  80                 rc = dynamic_funnel_enable_hw(drvdata, inport);
  81
  82         if (!rc)
  83                 dev_dbg(drvdata->dev, "FUNNEL inport %d enabled\n", inport);
  84         return rc;
  85 }
  86
  87 static void dynamic_funnel_disable_hw(struct funnel_drvdata *drvdata,
  88                                       int inport)
  89 {
  90         u32 functl;
  91
  92         CS_UNLOCK(drvdata->base);
  93
  94         functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
  95         functl &= ~(1 << inport);
  96         writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
  97
  98         /* Disclaim the device if none of the slaves are now active */
  99         if (!(functl & FUNNEL_ENSx_MASK))
 100                 coresight_disclaim_device_unlocked(drvdata->base);
 101
 102         CS_LOCK(drvdata->base);
 103 }
 104
 105 static void funnel_disable(struct coresight_device *csdev, int inport,
 106                            int outport)
 107 {
 108         struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
 109
 110         if (drvdata->base)
 111                 dynamic_funnel_disable_hw(drvdata, inport);
 112
 113         dev_dbg(drvdata->dev, "FUNNEL inport %d disabled\n", inport);
 114 }
 115
 116 static const struct coresight_ops_link funnel_link_ops = {
 117         .enable         = funnel_enable,
 118         .disable        = funnel_disable,
 119 };
 120
 121 static const struct coresight_ops funnel_cs_ops = {
 122         .link_ops       = &funnel_link_ops,
 123 };
 124
 125 static ssize_t priority_show(struct device *dev,
 126                              struct device_attribute *attr, char *buf)
 127 {
 128         struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
 129         unsigned long val = drvdata->priority;
 130
 131         return sprintf(buf, "%#lx\n", val);
 132 }
 133
 134 static ssize_t priority_store(struct device *dev,
 135                               struct device_attribute *attr,
 136                               const char *buf, size_t size)
 137 {
 138         int ret;
 139         unsigned long val;
 140         struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
 141
 142         ret = kstrtoul(buf, 16, &val);
 143         if (ret)
 144                 return ret;
 145
 146         drvdata->priority = val;
 147         return size;
 148 }
 149 static DEVICE_ATTR_RW(priority);
 150
 151 static u32 get_funnel_ctrl_hw(struct funnel_drvdata *drvdata)
 152 {
 153         u32 functl;
 154
 155         CS_UNLOCK(drvdata->base);
 156         functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
 157         CS_LOCK(drvdata->base);
 158
 159         return functl;
 160 }
 161
 162 static ssize_t funnel_ctrl_show(struct device *dev,
 163                              struct device_attribute *attr, char *buf)
 164 {
 165         u32 val;
 166         struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
 167
 168         pm_runtime_get_sync(drvdata->dev);
 169
 170         val = get_funnel_ctrl_hw(drvdata);
 171
 172         pm_runtime_put(drvdata->dev);
 173
 174         return sprintf(buf, "%#x\n", val);
 175 }
 176 static DEVICE_ATTR_RO(funnel_ctrl);
 177
 178 static struct attribute *coresight_funnel_attrs[] = {
 179         &dev_attr_funnel_ctrl.attr,
 180         &dev_attr_priority.attr,
 181         NULL,
 182 };
 183 ATTRIBUTE_GROUPS(coresight_funnel);
 184
 185 static int funnel_probe(struct device *dev, struct resource *res)
 186 {
 187         int ret;
 188         void __iomem *base;
 189         struct coresight_platform_data *pdata = NULL;
 190         struct funnel_drvdata *drvdata;
 191         struct coresight_desc desc = { 0 };
 192         struct device_node *np = dev->of_node;
 193
 194         if (np) {
 195                 pdata = of_get_coresight_platform_data(dev, np);
 196                 if (IS_ERR(pdata))
 197                         return PTR_ERR(pdata);
 198                 dev->platform_data = pdata;
 199         }
 200
 201         if (of_device_is_compatible(np, "arm,coresight-funnel"))
 202                 pr_warn_once("Uses OBSOLETE CoreSight funnel binding\n");
 203
 204         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 205         if (!drvdata)
 206                 return -ENOMEM;
 207
 208         drvdata->dev = dev;
 209         drvdata->atclk = devm_clk_get(dev, "atclk"); /* optional */
 210         if (!IS_ERR(drvdata->atclk)) {
 211                 ret = clk_prepare_enable(drvdata->atclk);
 212                 if (ret)
 213                         return ret;
 214         }
 215
 216         /*
 217          * Map the device base for dynamic-funnel, which has been
 218          * validated by AMBA core.
 219          */
 220         if (res) {
 221                 base = devm_ioremap_resource(dev, res);
 222                 if (IS_ERR(base)) {
 223                         ret = PTR_ERR(base);
 224                         goto out_disable_clk;
 225                 }
 226                 drvdata->base = base;
 227                 desc.groups = coresight_funnel_groups;
 228         }
 229
 230         dev_set_drvdata(dev, drvdata);
 231
 232         desc.type = CORESIGHT_DEV_TYPE_LINK;
 233         desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG;
 234         desc.ops = &funnel_cs_ops;
 235         desc.pdata = pdata;
 236         desc.dev = dev;
 237         drvdata->csdev = coresight_register(&desc);
 238         if (IS_ERR(drvdata->csdev)) {
 239                 ret = PTR_ERR(drvdata->csdev);
 240                 goto out_disable_clk;
 241         }
 242
 243         pm_runtime_put(dev);
 244
 245 out_disable_clk:
 246         if (ret && !IS_ERR_OR_NULL(drvdata->atclk))
 247                 clk_disable_unprepare(drvdata->atclk);
 248         return ret;
 249 }
 250
 251 #ifdef CONFIG_PM
 252 static int funnel_runtime_suspend(struct device *dev)
 253 {
 254         struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
 255
 256         if (drvdata && !IS_ERR(drvdata->atclk))
 257                 clk_disable_unprepare(drvdata->atclk);
 258
 259         return 0;
 260 }
 261
 262 static int funnel_runtime_resume(struct device *dev)
 263 {
 264         struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
 265
 266         if (drvdata && !IS_ERR(drvdata->atclk))
 267                 clk_prepare_enable(drvdata->atclk);
 268
 269         return 0;
 270 }
 271 #endif
 272
 273 static const struct dev_pm_ops funnel_dev_pm_ops = {
 274         SET_RUNTIME_PM_OPS(funnel_runtime_suspend, funnel_runtime_resume, NULL)
 275 };
 276
 277 static int static_funnel_probe(struct platform_device *pdev)
 278 {
 279         int ret;
 280
 281         pm_runtime_get_noresume(&pdev->dev);
 282         pm_runtime_set_active(&pdev->dev);
 283         pm_runtime_enable(&pdev->dev);
 284
 285         /* Static funnel do not have programming base */
 286         ret = funnel_probe(&pdev->dev, NULL);
 287
 288         if (ret) {
 289                 pm_runtime_put_noidle(&pdev->dev);
 290                 pm_runtime_disable(&pdev->dev);
 291         }
 292
 293         return ret;
 294 }
 295
 296 static const struct of_device_id static_funnel_match[] = {
 297         {.compatible = "arm,coresight-static-funnel"},
 298         {}
 299 };
 300
 301 static struct platform_driver static_funnel_driver = {
 302         .probe          = static_funnel_probe,
 303         .driver         = {
 304                 .name   = "coresight-static-funnel",
 305                 .of_match_table = static_funnel_match,
 306                 .pm     = &funnel_dev_pm_ops,
 307                 .suppress_bind_attrs = true,
 308         },
 309 };
 310 builtin_platform_driver(static_funnel_driver);
 311
 312 static int dynamic_funnel_probe(struct amba_device *adev,
 313                                 const struct amba_id *id)
 314 {
 315         return funnel_probe(&adev->dev, &adev->res);
 316 }
 317
 318 static const struct amba_id dynamic_funnel_ids[] = {
 319         {
 320                 .id     = 0x000bb908,
 321                 .mask   = 0x000fffff,
 322         },
 323         {
 324                 /* Coresight SoC-600 */
 325                 .id     = 0x000bb9eb,
 326                 .mask   = 0x000fffff,
 327         },
 328         { 0, 0},
 329 };
 330
 331 static struct amba_driver dynamic_funnel_driver = {
 332         .drv = {
 333                 .name   = "coresight-dynamic-funnel",
 334                 .owner  = THIS_MODULE,
 335                 .pm     = &funnel_dev_pm_ops,
 336                 .suppress_bind_attrs = true,
 337         },
 338         .probe          = dynamic_funnel_probe,
 339         .id_table       = dynamic_funnel_ids,
 340 };
 341 builtin_amba_driver(dynamic_funnel_driver);