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/pm_runtime.h>
  16 #include <linux/coresight.h>
  17 #include <linux/amba/bus.h>
  18 #include <linux/clk.h>
  19
  20 #include "coresight-priv.h"
  21
  22 #define FUNNEL_FUNCTL           0x000
  23 #define FUNNEL_PRICTL           0x004
  24
  25 #define FUNNEL_HOLDTIME_MASK    0xf00
  26 #define FUNNEL_HOLDTIME_SHFT    0x8
  27 #define FUNNEL_HOLDTIME         (0x7 << FUNNEL_HOLDTIME_SHFT)
  28 #define FUNNEL_ENSx_MASK        0xff
  29
  30 /**
  31  * struct funnel_drvdata - specifics associated to a funnel component
  32  * @base:       memory mapped base address for this component.
  33  * @dev:        the device entity associated to this component.
  34  * @atclk:      optional clock for the core parts of the funnel.
  35  * @csdev:      component vitals needed by the framework.
  36  * @priority:   port selection order.
  37  */
  38 struct funnel_drvdata {
  39         void __iomem            *base;
  40         struct device           *dev;
  41         struct clk              *atclk;
  42         struct coresight_device *csdev;
  43         unsigned long           priority;
  44 };
  45
  46 static int funnel_enable_hw(struct funnel_drvdata *drvdata, int port)
  47 {
  48         u32 functl;
  49         int rc = 0;
  50
  51         CS_UNLOCK(drvdata->base);
  52
  53         functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
  54         /* Claim the device only when we enable the first slave */
  55         if (!(functl & FUNNEL_ENSx_MASK)) {
  56                 rc = coresight_claim_device_unlocked(drvdata->base);
  57                 if (rc)
  58                         goto done;
  59         }
  60
  61         functl &= ~FUNNEL_HOLDTIME_MASK;
  62         functl |= FUNNEL_HOLDTIME;
  63         functl |= (1 << port);
  64         writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
  65         writel_relaxed(drvdata->priority, drvdata->base + FUNNEL_PRICTL);
  66 done:
  67         CS_LOCK(drvdata->base);
  68         return rc;
  69 }
  70
  71 static int funnel_enable(struct coresight_device *csdev, int inport,
  72                          int outport)
  73 {
  74         int rc;
  75         struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
  76
  77         rc = funnel_enable_hw(drvdata, inport);
  78
  79         if (!rc)
  80                 dev_dbg(drvdata->dev, "FUNNEL inport %d enabled\n", inport);
  81         return rc;
  82 }
  83
  84 static void funnel_disable_hw(struct funnel_drvdata *drvdata, int inport)
  85 {
  86         u32 functl;
  87
  88         CS_UNLOCK(drvdata->base);
  89
  90         functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
  91         functl &= ~(1 << inport);
  92         writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
  93
  94         /* Disclaim the device if none of the slaves are now active */
  95         if (!(functl & FUNNEL_ENSx_MASK))
  96                 coresight_disclaim_device_unlocked(drvdata->base);
  97
  98         CS_LOCK(drvdata->base);
  99 }
 100
 101 static void funnel_disable(struct coresight_device *csdev, int inport,
 102                            int outport)
 103 {
 104         struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
 105
 106         funnel_disable_hw(drvdata, inport);
 107
 108         dev_dbg(drvdata->dev, "FUNNEL inport %d disabled\n", inport);
 109 }
 110
 111 static const struct coresight_ops_link funnel_link_ops = {
 112         .enable         = funnel_enable,
 113         .disable        = funnel_disable,
 114 };
 115
 116 static const struct coresight_ops funnel_cs_ops = {
 117         .link_ops       = &funnel_link_ops,
 118 };
 119
 120 static ssize_t priority_show(struct device *dev,
 121                              struct device_attribute *attr, char *buf)
 122 {
 123         struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
 124         unsigned long val = drvdata->priority;
 125
 126         return sprintf(buf, "%#lx\n", val);
 127 }
 128
 129 static ssize_t priority_store(struct device *dev,
 130                               struct device_attribute *attr,
 131                               const char *buf, size_t size)
 132 {
 133         int ret;
 134         unsigned long val;
 135         struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
 136
 137         ret = kstrtoul(buf, 16, &val);
 138         if (ret)
 139                 return ret;
 140
 141         drvdata->priority = val;
 142         return size;
 143 }
 144 static DEVICE_ATTR_RW(priority);
 145
 146 static u32 get_funnel_ctrl_hw(struct funnel_drvdata *drvdata)
 147 {
 148         u32 functl;
 149
 150         CS_UNLOCK(drvdata->base);
 151         functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
 152         CS_LOCK(drvdata->base);
 153
 154         return functl;
 155 }
 156
 157 static ssize_t funnel_ctrl_show(struct device *dev,
 158                              struct device_attribute *attr, char *buf)
 159 {
 160         u32 val;
 161         struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
 162
 163         pm_runtime_get_sync(drvdata->dev);
 164
 165         val = get_funnel_ctrl_hw(drvdata);
 166
 167         pm_runtime_put(drvdata->dev);
 168
 169         return sprintf(buf, "%#x\n", val);
 170 }
 171 static DEVICE_ATTR_RO(funnel_ctrl);
 172
 173 static struct attribute *coresight_funnel_attrs[] = {
 174         &dev_attr_funnel_ctrl.attr,
 175         &dev_attr_priority.attr,
 176         NULL,
 177 };
 178 ATTRIBUTE_GROUPS(coresight_funnel);
 179
 180 static int funnel_probe(struct amba_device *adev, const struct amba_id *id)
 181 {
 182         int ret;
 183         void __iomem *base;
 184         struct device *dev = &adev->dev;
 185         struct coresight_platform_data *pdata = NULL;
 186         struct funnel_drvdata *drvdata;
 187         struct resource *res = &adev->res;
 188         struct coresight_desc desc = { 0 };
 189         struct device_node *np = adev->dev.of_node;
 190
 191         if (np) {
 192                 pdata = of_get_coresight_platform_data(dev, np);
 193                 if (IS_ERR(pdata))
 194                         return PTR_ERR(pdata);
 195                 adev->dev.platform_data = pdata;
 196         }
 197
 198         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 199         if (!drvdata)
 200                 return -ENOMEM;
 201
 202         drvdata->dev = &adev->dev;
 203         drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
 204         if (!IS_ERR(drvdata->atclk)) {
 205                 ret = clk_prepare_enable(drvdata->atclk);
 206                 if (ret)
 207                         return ret;
 208         }
 209         dev_set_drvdata(dev, drvdata);
 210
 211         /* Validity for the resource is already checked by the AMBA core */
 212         base = devm_ioremap_resource(dev, res);
 213         if (IS_ERR(base))
 214                 return PTR_ERR(base);
 215
 216         drvdata->base = base;
 217         pm_runtime_put(&adev->dev);
 218
 219         desc.type = CORESIGHT_DEV_TYPE_LINK;
 220         desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG;
 221         desc.ops = &funnel_cs_ops;
 222         desc.pdata = pdata;
 223         desc.dev = dev;
 224         desc.groups = coresight_funnel_groups;
 225         drvdata->csdev = coresight_register(&desc);
 226
 227         return PTR_ERR_OR_ZERO(drvdata->csdev);
 228 }
 229
 230 #ifdef CONFIG_PM
 231 static int funnel_runtime_suspend(struct device *dev)
 232 {
 233         struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
 234
 235         if (drvdata && !IS_ERR(drvdata->atclk))
 236                 clk_disable_unprepare(drvdata->atclk);
 237
 238         return 0;
 239 }
 240
 241 static int funnel_runtime_resume(struct device *dev)
 242 {
 243         struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
 244
 245         if (drvdata && !IS_ERR(drvdata->atclk))
 246                 clk_prepare_enable(drvdata->atclk);
 247
 248         return 0;
 249 }
 250 #endif
 251
 252 static const struct dev_pm_ops funnel_dev_pm_ops = {
 253         SET_RUNTIME_PM_OPS(funnel_runtime_suspend, funnel_runtime_resume, NULL)
 254 };
 255
 256 static const struct amba_id funnel_ids[] = {
 257         {
 258                 .id     = 0x000bb908,
 259                 .mask   = 0x000fffff,
 260         },
 261         {
 262                 /* Coresight SoC-600 */
 263                 .id     = 0x000bb9eb,
 264                 .mask   = 0x000fffff,
 265         },
 266         { 0, 0},
 267 };
 268
 269 static struct amba_driver funnel_driver = {
 270         .drv = {
 271                 .name   = "coresight-funnel",
 272                 .owner  = THIS_MODULE,
 273                 .pm     = &funnel_dev_pm_ops,
 274                 .suppress_bind_attrs = true,
 275         },
 276         .probe          = funnel_probe,
 277         .id_table       = funnel_ids,
 278 };
 279 builtin_amba_driver(funnel_driver);