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/acpi.h>
   9 #include <linux/kernel.h>
  10 #include <linux/init.h>
  11 #include <linux/types.h>
  12 #include <linux/device.h>
  13 #include <linux/err.h>
  14 #include <linux/fs.h>
  15 #include <linux/slab.h>
  16 #include <linux/of.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/pm_runtime.h>
  19 #include <linux/coresight.h>
  20 #include <linux/amba/bus.h>
  21 #include <linux/clk.h>
  22
  23 #include "coresight-priv.h"
  24
  25 #define FUNNEL_FUNCTL           0x000
  26 #define FUNNEL_PRICTL           0x004
  27
  28 #define FUNNEL_HOLDTIME_MASK    0xf00
  29 #define FUNNEL_HOLDTIME_SHFT    0x8
  30 #define FUNNEL_HOLDTIME         (0x7 << FUNNEL_HOLDTIME_SHFT)
  31 #define FUNNEL_ENSx_MASK        0xff
  32
  33 DEFINE_CORESIGHT_DEVLIST(funnel_devs, "funnel");
  34
  35 /**
  36  * struct funnel_drvdata - specifics associated to a funnel component
  37  * @base:       memory mapped base address for this component.
  38  * @atclk:      optional clock for the core parts of the funnel.
  39  * @csdev:      component vitals needed by the framework.
  40  * @priority:   port selection order.
  41  */
  42 struct funnel_drvdata {
  43         void __iomem            *base;
  44         struct clk              *atclk;
  45         struct coresight_device *csdev;
  46         unsigned long           priority;
  47 };
  48
  49 static int dynamic_funnel_enable_hw(struct funnel_drvdata *drvdata, int port)
  50 {
  51         u32 functl;
  52         int rc = 0;
  53
  54         CS_UNLOCK(drvdata->base);
  55
  56         functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
  57         /* Claim the device only when we enable the first slave */
  58         if (!(functl & FUNNEL_ENSx_MASK)) {
  59                 rc = coresight_claim_device_unlocked(drvdata->base);
  60                 if (rc)
  61                         goto done;
  62         }
  63
  64         functl &= ~FUNNEL_HOLDTIME_MASK;
  65         functl |= FUNNEL_HOLDTIME;
  66         functl |= (1 << port);
  67         writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
  68         writel_relaxed(drvdata->priority, drvdata->base + FUNNEL_PRICTL);
  69 done:
  70         CS_LOCK(drvdata->base);
  71         return rc;
  72 }
  73
  74 static int funnel_enable(struct coresight_device *csdev, int inport,
  75                          int outport)
  76 {
  77         int rc = 0;
  78         struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
  79
  80         if (drvdata->base)
  81                 rc = dynamic_funnel_enable_hw(drvdata, inport);
  82
  83         if (!rc)
  84                 dev_dbg(&csdev->dev, "FUNNEL inport %d enabled\n", inport);
  85         return rc;
  86 }
  87
  88 static void dynamic_funnel_disable_hw(struct funnel_drvdata *drvdata,
  89                                       int inport)
  90 {
  91         u32 functl;
  92
  93         CS_UNLOCK(drvdata->base);
  94
  95         functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
  96         functl &= ~(1 << inport);
  97         writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
  98
  99         /* Disclaim the device if none of the slaves are now active */
 100         if (!(functl & FUNNEL_ENSx_MASK))
 101                 coresight_disclaim_device_unlocked(drvdata->base);
 102
 103         CS_LOCK(drvdata->base);
 104 }
 105
 106 static void funnel_disable(struct coresight_device *csdev, int inport,
 107                            int outport)
 108 {
 109         struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
 110
 111         if (drvdata->base)
 112                 dynamic_funnel_disable_hw(drvdata, inport);
 113
 114         dev_dbg(&csdev->dev, "FUNNEL inport %d disabled\n", inport);
 115 }
 116
 117 static const struct coresight_ops_link funnel_link_ops = {
 118         .enable         = funnel_enable,
 119         .disable        = funnel_disable,
 120 };
 121
 122 static const struct coresight_ops funnel_cs_ops = {
 123         .link_ops       = &funnel_link_ops,
 124 };
 125
 126 static ssize_t priority_show(struct device *dev,
 127                              struct device_attribute *attr, char *buf)
 128 {
 129         struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
 130         unsigned long val = drvdata->priority;
 131
 132         return sprintf(buf, "%#lx\n", val);
 133 }
 134
 135 static ssize_t priority_store(struct device *dev,
 136                               struct device_attribute *attr,
 137                               const char *buf, size_t size)
 138 {
 139         int ret;
 140         unsigned long val;
 141         struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
 142
 143         ret = kstrtoul(buf, 16, &val);
 144         if (ret)
 145                 return ret;
 146
 147         drvdata->priority = val;
 148         return size;
 149 }
 150 static DEVICE_ATTR_RW(priority);
 151
 152 static u32 get_funnel_ctrl_hw(struct funnel_drvdata *drvdata)
 153 {
 154         u32 functl;
 155
 156         CS_UNLOCK(drvdata->base);
 157         functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
 158         CS_LOCK(drvdata->base);
 159
 160         return functl;
 161 }
 162
 163 static ssize_t funnel_ctrl_show(struct device *dev,
 164                              struct device_attribute *attr, char *buf)
 165 {
 166         u32 val;
 167         struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
 168
 169         pm_runtime_get_sync(dev->parent);
 170
 171         val = get_funnel_ctrl_hw(drvdata);
 172
 173         pm_runtime_put(dev->parent);
 174
 175         return sprintf(buf, "%#x\n", val);
 176 }
 177 static DEVICE_ATTR_RO(funnel_ctrl);
 178
 179 static struct attribute *coresight_funnel_attrs[] = {
 180         &dev_attr_funnel_ctrl.attr,
 181         &dev_attr_priority.attr,
 182         NULL,
 183 };
 184 ATTRIBUTE_GROUPS(coresight_funnel);
 185
 186 static int funnel_probe(struct device *dev, struct resource *res)
 187 {
 188         int ret;
 189         void __iomem *base;
 190         struct coresight_platform_data *pdata = NULL;
 191         struct funnel_drvdata *drvdata;
 192         struct coresight_desc desc = { 0 };
 193
 194         if (is_of_node(dev_fwnode(dev)) &&
 195             of_device_is_compatible(dev->of_node, "arm,coresight-funnel"))
 196                 dev_warn_once(dev, "Uses OBSOLETE CoreSight funnel binding\n");
 197
 198         desc.name = coresight_alloc_device_name(&funnel_devs, dev);
 199         if (!desc.name)
 200                 return -ENOMEM;
 201
 202         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 203         if (!drvdata)
 204                 return -ENOMEM;
 205
 206         drvdata->atclk = devm_clk_get(dev, "atclk"); /* optional */
 207         if (!IS_ERR(drvdata->atclk)) {
 208                 ret = clk_prepare_enable(drvdata->atclk);
 209                 if (ret)
 210                         return ret;
 211         }
 212
 213         /*
 214          * Map the device base for dynamic-funnel, which has been
 215          * validated by AMBA core.
 216          */
 217         if (res) {
 218                 base = devm_ioremap_resource(dev, res);
 219                 if (IS_ERR(base)) {
 220                         ret = PTR_ERR(base);
 221                         goto out_disable_clk;
 222                 }
 223                 drvdata->base = base;
 224                 desc.groups = coresight_funnel_groups;
 225         }
 226
 227         dev_set_drvdata(dev, drvdata);
 228
 229         pdata = coresight_get_platform_data(dev);
 230         if (IS_ERR(pdata)) {
 231                 ret = PTR_ERR(pdata);
 232                 goto out_disable_clk;
 233         }
 234         dev->platform_data = pdata;
 235
 236         desc.type = CORESIGHT_DEV_TYPE_LINK;
 237         desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG;
 238         desc.ops = &funnel_cs_ops;
 239         desc.pdata = pdata;
 240         desc.dev = dev;
 241         drvdata->csdev = coresight_register(&desc);
 242         if (IS_ERR(drvdata->csdev)) {
 243                 ret = PTR_ERR(drvdata->csdev);
 244                 goto out_disable_clk;
 245         }
 246
 247         pm_runtime_put(dev);
 248         ret = 0;
 249
 250 out_disable_clk:
 251         if (ret && !IS_ERR_OR_NULL(drvdata->atclk))
 252                 clk_disable_unprepare(drvdata->atclk);
 253         return ret;
 254 }
 255
 256 #ifdef CONFIG_PM
 257 static int funnel_runtime_suspend(struct device *dev)
 258 {
 259         struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
 260
 261         if (drvdata && !IS_ERR(drvdata->atclk))
 262                 clk_disable_unprepare(drvdata->atclk);
 263
 264         return 0;
 265 }
 266
 267 static int funnel_runtime_resume(struct device *dev)
 268 {
 269         struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
 270
 271         if (drvdata && !IS_ERR(drvdata->atclk))
 272                 clk_prepare_enable(drvdata->atclk);
 273
 274         return 0;
 275 }
 276 #endif
 277
 278 static const struct dev_pm_ops funnel_dev_pm_ops = {
 279         SET_RUNTIME_PM_OPS(funnel_runtime_suspend, funnel_runtime_resume, NULL)
 280 };
 281
 282 static int static_funnel_probe(struct platform_device *pdev)
 283 {
 284         int ret;
 285
 286         pm_runtime_get_noresume(&pdev->dev);
 287         pm_runtime_set_active(&pdev->dev);
 288         pm_runtime_enable(&pdev->dev);
 289
 290         /* Static funnel do not have programming base */
 291         ret = funnel_probe(&pdev->dev, NULL);
 292
 293         if (ret) {
 294                 pm_runtime_put_noidle(&pdev->dev);
 295                 pm_runtime_disable(&pdev->dev);
 296         }
 297
 298         return ret;
 299 }
 300
 301 static const struct of_device_id static_funnel_match[] = {
 302         {.compatible = "arm,coresight-static-funnel"},
 303         {}
 304 };
 305
 306 #ifdef CONFIG_ACPI
 307 static const struct acpi_device_id static_funnel_ids[] = {
 308         {"ARMHC9FE", 0},
 309         {},
 310 };
 311 #endif
 312
 313 static struct platform_driver static_funnel_driver = {
 314         .probe          = static_funnel_probe,
 315         .driver         = {
 316                 .name   = "coresight-static-funnel",
 317                 .of_match_table = static_funnel_match,
 318                 .acpi_match_table = ACPI_PTR(static_funnel_ids),
 319                 .pm     = &funnel_dev_pm_ops,
 320                 .suppress_bind_attrs = true,
 321         },
 322 };
 323 builtin_platform_driver(static_funnel_driver);
 324
 325 static int dynamic_funnel_probe(struct amba_device *adev,
 326                                 const struct amba_id *id)
 327 {
 328         return funnel_probe(&adev->dev, &adev->res);
 329 }
 330
 331 static const struct amba_id dynamic_funnel_ids[] = {
 332         {
 333                 .id     = 0x000bb908,
 334                 .mask   = 0x000fffff,
 335         },
 336         {
 337                 /* Coresight SoC-600 */
 338                 .id     = 0x000bb9eb,
 339                 .mask   = 0x000fffff,
 340         },
 341         { 0, 0},
 342 };
 343
 344 static struct amba_driver dynamic_funnel_driver = {
 345         .drv = {
 346                 .name   = "coresight-dynamic-funnel",
 347                 .owner  = THIS_MODULE,
 348                 .pm     = &funnel_dev_pm_ops,
 349                 .suppress_bind_attrs = true,
 350         },
 351         .probe          = dynamic_funnel_probe,
 352         .id_table       = dynamic_funnel_ids,
 353 };
 354 builtin_amba_driver(dynamic_funnel_driver);