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
  29 /**
  30  * struct funnel_drvdata - specifics associated to a funnel component
  31  * @base:       memory mapped base address for this component.
  32  * @dev:        the device entity associated to this component.
  33  * @atclk:      optional clock for the core parts of the funnel.
  34  * @csdev:      component vitals needed by the framework.
  35  * @priority:   port selection order.
  36  */
  37 struct funnel_drvdata {
  38         void __iomem            *base;
  39         struct device           *dev;
  40         struct clk              *atclk;
  41         struct coresight_device *csdev;
  42         unsigned long           priority;
  43 };
  44
  45 static void funnel_enable_hw(struct funnel_drvdata *drvdata, int port)
  46 {
  47         u32 functl;
  48
  49         CS_UNLOCK(drvdata->base);
  50
  51         functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
  52         functl &= ~FUNNEL_HOLDTIME_MASK;
  53         functl |= FUNNEL_HOLDTIME;
  54         functl |= (1 << port);
  55         writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
  56         writel_relaxed(drvdata->priority, drvdata->base + FUNNEL_PRICTL);
  57
  58         CS_LOCK(drvdata->base);
  59 }
  60
  61 static int funnel_enable(struct coresight_device *csdev, int inport,
  62                          int outport)
  63 {
  64         struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
  65
  66         funnel_enable_hw(drvdata, inport);
  67
  68         dev_info(drvdata->dev, "FUNNEL inport %d enabled\n", inport);
  69         return 0;
  70 }
  71
  72 static void funnel_disable_hw(struct funnel_drvdata *drvdata, int inport)
  73 {
  74         u32 functl;
  75
  76         CS_UNLOCK(drvdata->base);
  77
  78         functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
  79         functl &= ~(1 << inport);
  80         writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
  81
  82         CS_LOCK(drvdata->base);
  83 }
  84
  85 static void funnel_disable(struct coresight_device *csdev, int inport,
  86                            int outport)
  87 {
  88         struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
  89
  90         funnel_disable_hw(drvdata, inport);
  91
  92         dev_info(drvdata->dev, "FUNNEL inport %d disabled\n", inport);
  93 }
  94
  95 static const struct coresight_ops_link funnel_link_ops = {
  96         .enable         = funnel_enable,
  97         .disable        = funnel_disable,
  98 };
  99
 100 static const struct coresight_ops funnel_cs_ops = {
 101         .link_ops       = &funnel_link_ops,
 102 };
 103
 104 static ssize_t priority_show(struct device *dev,
 105                              struct device_attribute *attr, char *buf)
 106 {
 107         struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
 108         unsigned long val = drvdata->priority;
 109
 110         return sprintf(buf, "%#lx\n", val);
 111 }
 112
 113 static ssize_t priority_store(struct device *dev,
 114                               struct device_attribute *attr,
 115                               const char *buf, size_t size)
 116 {
 117         int ret;
 118         unsigned long val;
 119         struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
 120
 121         ret = kstrtoul(buf, 16, &val);
 122         if (ret)
 123                 return ret;
 124
 125         drvdata->priority = val;
 126         return size;
 127 }
 128 static DEVICE_ATTR_RW(priority);
 129
 130 static u32 get_funnel_ctrl_hw(struct funnel_drvdata *drvdata)
 131 {
 132         u32 functl;
 133
 134         CS_UNLOCK(drvdata->base);
 135         functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
 136         CS_LOCK(drvdata->base);
 137
 138         return functl;
 139 }
 140
 141 static ssize_t funnel_ctrl_show(struct device *dev,
 142                              struct device_attribute *attr, char *buf)
 143 {
 144         u32 val;
 145         struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
 146
 147         pm_runtime_get_sync(drvdata->dev);
 148
 149         val = get_funnel_ctrl_hw(drvdata);
 150
 151         pm_runtime_put(drvdata->dev);
 152
 153         return sprintf(buf, "%#x\n", val);
 154 }
 155 static DEVICE_ATTR_RO(funnel_ctrl);
 156
 157 static struct attribute *coresight_funnel_attrs[] = {
 158         &dev_attr_funnel_ctrl.attr,
 159         &dev_attr_priority.attr,
 160         NULL,
 161 };
 162 ATTRIBUTE_GROUPS(coresight_funnel);
 163
 164 static int funnel_probe(struct amba_device *adev, const struct amba_id *id)
 165 {
 166         int ret;
 167         void __iomem *base;
 168         struct device *dev = &adev->dev;
 169         struct coresight_platform_data *pdata = NULL;
 170         struct funnel_drvdata *drvdata;
 171         struct resource *res = &adev->res;
 172         struct coresight_desc desc = { 0 };
 173         struct device_node *np = adev->dev.of_node;
 174
 175         if (np) {
 176                 pdata = of_get_coresight_platform_data(dev, np);
 177                 if (IS_ERR(pdata))
 178                         return PTR_ERR(pdata);
 179                 adev->dev.platform_data = pdata;
 180         }
 181
 182         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 183         if (!drvdata)
 184                 return -ENOMEM;
 185
 186         drvdata->dev = &adev->dev;
 187         drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
 188         if (!IS_ERR(drvdata->atclk)) {
 189                 ret = clk_prepare_enable(drvdata->atclk);
 190                 if (ret)
 191                         return ret;
 192         }
 193         dev_set_drvdata(dev, drvdata);
 194
 195         /* Validity for the resource is already checked by the AMBA core */
 196         base = devm_ioremap_resource(dev, res);
 197         if (IS_ERR(base))
 198                 return PTR_ERR(base);
 199
 200         drvdata->base = base;
 201         pm_runtime_put(&adev->dev);
 202
 203         desc.type = CORESIGHT_DEV_TYPE_LINK;
 204         desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG;
 205         desc.ops = &funnel_cs_ops;
 206         desc.pdata = pdata;
 207         desc.dev = dev;
 208         desc.groups = coresight_funnel_groups;
 209         drvdata->csdev = coresight_register(&desc);
 210
 211         return PTR_ERR_OR_ZERO(drvdata->csdev);
 212 }
 213
 214 #ifdef CONFIG_PM
 215 static int funnel_runtime_suspend(struct device *dev)
 216 {
 217         struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
 218
 219         if (drvdata && !IS_ERR(drvdata->atclk))
 220                 clk_disable_unprepare(drvdata->atclk);
 221
 222         return 0;
 223 }
 224
 225 static int funnel_runtime_resume(struct device *dev)
 226 {
 227         struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
 228
 229         if (drvdata && !IS_ERR(drvdata->atclk))
 230                 clk_prepare_enable(drvdata->atclk);
 231
 232         return 0;
 233 }
 234 #endif
 235
 236 static const struct dev_pm_ops funnel_dev_pm_ops = {
 237         SET_RUNTIME_PM_OPS(funnel_runtime_suspend, funnel_runtime_resume, NULL)
 238 };
 239
 240 static const struct amba_id funnel_ids[] = {
 241         {
 242                 .id     = 0x000bb908,
 243                 .mask   = 0x000fffff,
 244         },
 245         {
 246                 /* Coresight SoC-600 */
 247                 .id     = 0x000bb9eb,
 248                 .mask   = 0x000fffff,
 249         },
 250         { 0, 0},
 251 };
 252
 253 static struct amba_driver funnel_driver = {
 254         .drv = {
 255                 .name   = "coresight-funnel",
 256                 .owner  = THIS_MODULE,
 257                 .pm     = &funnel_dev_pm_ops,
 258                 .suppress_bind_attrs = true,
 259         },
 260         .probe          = funnel_probe,
 261         .id_table       = funnel_ids,
 262 };
 263 builtin_amba_driver(funnel_driver);