kernel/drivers/hwtracing/coresight/coresight-funnel.c

   1 /* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License version 2 and
   5  * only version 2 as published by the Free Software Foundation.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/types.h>
  17 #include <linux/device.h>
  18 #include <linux/err.h>
  19 #include <linux/fs.h>
  20 #include <linux/slab.h>
  21 #include <linux/pm_runtime.h>
  22 #include <linux/coresight.h>
  23 #include <linux/amba/bus.h>
  24 #include <linux/clk.h>
  25
  26 #include "coresight-priv.h"
  27
  28 #define FUNNEL_FUNCTL           0x000
  29 #define FUNNEL_PRICTL           0x004
  30
  31 #define FUNNEL_HOLDTIME_MASK    0xf00
  32 #define FUNNEL_HOLDTIME_SHFT    0x8
  33 #define FUNNEL_HOLDTIME         (0x7 << FUNNEL_HOLDTIME_SHFT)
  34
  35 /**
  36  * struct funnel_drvdata - specifics associated to a funnel component
  37  * @base:       memory mapped base address for this component.
  38  * @dev:        the device entity associated to this component.
  39  * @atclk:      optional clock for the core parts of the funnel.
  40  * @csdev:      component vitals needed by the framework.
  41  * @priority:   port selection order.
  42  */
  43 struct funnel_drvdata {
  44         void __iomem            *base;
  45         struct device           *dev;
  46         struct clk              *atclk;
  47         struct coresight_device *csdev;
  48         unsigned long           priority;
  49 };
  50
  51 static void funnel_enable_hw(struct funnel_drvdata *drvdata, int port)
  52 {
  53         u32 functl;
  54
  55         CS_UNLOCK(drvdata->base);
  56
  57         functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
  58         functl &= ~FUNNEL_HOLDTIME_MASK;
  59         functl |= FUNNEL_HOLDTIME;
  60         functl |= (1 << port);
  61         writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
  62         writel_relaxed(drvdata->priority, drvdata->base + FUNNEL_PRICTL);
  63
  64         CS_LOCK(drvdata->base);
  65 }
  66
  67 static int funnel_enable(struct coresight_device *csdev, int inport,
  68                          int outport)
  69 {
  70         struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
  71
  72         pm_runtime_get_sync(drvdata->dev);
  73         funnel_enable_hw(drvdata, inport);
  74
  75         dev_info(drvdata->dev, "FUNNEL inport %d enabled\n", inport);
  76         return 0;
  77 }
  78
  79 static void funnel_disable_hw(struct funnel_drvdata *drvdata, int inport)
  80 {
  81         u32 functl;
  82
  83         CS_UNLOCK(drvdata->base);
  84
  85         functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
  86         functl &= ~(1 << inport);
  87         writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
  88
  89         CS_LOCK(drvdata->base);
  90 }
  91
  92 static void funnel_disable(struct coresight_device *csdev, int inport,
  93                            int outport)
  94 {
  95         struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
  96
  97         funnel_disable_hw(drvdata, inport);
  98         pm_runtime_put(drvdata->dev);
  99
 100         dev_info(drvdata->dev, "FUNNEL inport %d disabled\n", inport);
 101 }
 102
 103 static const struct coresight_ops_link funnel_link_ops = {
 104         .enable         = funnel_enable,
 105         .disable        = funnel_disable,
 106 };
 107
 108 static const struct coresight_ops funnel_cs_ops = {
 109         .link_ops       = &funnel_link_ops,
 110 };
 111
 112 static ssize_t priority_show(struct device *dev,
 113                              struct device_attribute *attr, char *buf)
 114 {
 115         struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
 116         unsigned long val = drvdata->priority;
 117
 118         return sprintf(buf, "%#lx\n", val);
 119 }
 120
 121 static ssize_t priority_store(struct device *dev,
 122                               struct device_attribute *attr,
 123                               const char *buf, size_t size)
 124 {
 125         int ret;
 126         unsigned long val;
 127         struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
 128
 129         ret = kstrtoul(buf, 16, &val);
 130         if (ret)
 131                 return ret;
 132
 133         drvdata->priority = val;
 134         return size;
 135 }
 136 static DEVICE_ATTR_RW(priority);
 137
 138 static u32 get_funnel_ctrl_hw(struct funnel_drvdata *drvdata)
 139 {
 140         u32 functl;
 141
 142         CS_UNLOCK(drvdata->base);
 143         functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
 144         CS_LOCK(drvdata->base);
 145
 146         return functl;
 147 }
 148
 149 static ssize_t funnel_ctrl_show(struct device *dev,
 150                              struct device_attribute *attr, char *buf)
 151 {
 152         u32 val;
 153         struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
 154
 155         pm_runtime_get_sync(drvdata->dev);
 156
 157         val = get_funnel_ctrl_hw(drvdata);
 158
 159         pm_runtime_put(drvdata->dev);
 160
 161         return sprintf(buf, "%#x\n", val);
 162 }
 163 static DEVICE_ATTR_RO(funnel_ctrl);
 164
 165 static struct attribute *coresight_funnel_attrs[] = {
 166         &dev_attr_funnel_ctrl.attr,
 167         &dev_attr_priority.attr,
 168         NULL,
 169 };
 170 ATTRIBUTE_GROUPS(coresight_funnel);
 171
 172 static int funnel_probe(struct amba_device *adev, const struct amba_id *id)
 173 {
 174         int ret;
 175         void __iomem *base;
 176         struct device *dev = &adev->dev;
 177         struct coresight_platform_data *pdata = NULL;
 178         struct funnel_drvdata *drvdata;
 179         struct resource *res = &adev->res;
 180         struct coresight_desc *desc;
 181         struct device_node *np = adev->dev.of_node;
 182
 183         if (np) {
 184                 pdata = of_get_coresight_platform_data(dev, np);
 185                 if (IS_ERR(pdata))
 186                         return PTR_ERR(pdata);
 187                 adev->dev.platform_data = pdata;
 188         }
 189
 190         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 191         if (!drvdata)
 192                 return -ENOMEM;
 193
 194         drvdata->dev = &adev->dev;
 195         drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
 196         if (!IS_ERR(drvdata->atclk)) {
 197                 ret = clk_prepare_enable(drvdata->atclk);
 198                 if (ret)
 199                         return ret;
 200         }
 201         dev_set_drvdata(dev, drvdata);
 202
 203         /* Validity for the resource is already checked by the AMBA core */
 204         base = devm_ioremap_resource(dev, res);
 205         if (IS_ERR(base))
 206                 return PTR_ERR(base);
 207
 208         drvdata->base = base;
 209         pm_runtime_put(&adev->dev);
 210
 211         desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
 212         if (!desc)
 213                 return -ENOMEM;
 214
 215         desc->type = CORESIGHT_DEV_TYPE_LINK;
 216         desc->subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG;
 217         desc->ops = &funnel_cs_ops;
 218         desc->pdata = pdata;
 219         desc->dev = dev;
 220         desc->groups = coresight_funnel_groups;
 221         drvdata->csdev = coresight_register(desc);
 222         if (IS_ERR(drvdata->csdev))
 223                 return PTR_ERR(drvdata->csdev);
 224
 225         dev_info(dev, "FUNNEL initialized\n");
 226         return 0;
 227 }
 228
 229 static int funnel_remove(struct amba_device *adev)
 230 {
 231         struct funnel_drvdata *drvdata = amba_get_drvdata(adev);
 232
 233         coresight_unregister(drvdata->csdev);
 234         return 0;
 235 }
 236
 237 #ifdef CONFIG_PM
 238 static int funnel_runtime_suspend(struct device *dev)
 239 {
 240         struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
 241
 242         if (drvdata && !IS_ERR(drvdata->atclk))
 243                 clk_disable_unprepare(drvdata->atclk);
 244
 245         return 0;
 246 }
 247
 248 static int funnel_runtime_resume(struct device *dev)
 249 {
 250         struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
 251
 252         if (drvdata && !IS_ERR(drvdata->atclk))
 253                 clk_prepare_enable(drvdata->atclk);
 254
 255         return 0;
 256 }
 257 #endif
 258
 259 static const struct dev_pm_ops funnel_dev_pm_ops = {
 260         SET_RUNTIME_PM_OPS(funnel_runtime_suspend, funnel_runtime_resume, NULL)
 261 };
 262
 263 static struct amba_id funnel_ids[] = {
 264         {
 265                 .id     = 0x0003b908,
 266                 .mask   = 0x0003ffff,
 267         },
 268         { 0, 0},
 269 };
 270
 271 static struct amba_driver funnel_driver = {
 272         .drv = {
 273                 .name   = "coresight-funnel",
 274                 .owner  = THIS_MODULE,
 275                 .pm     = &funnel_dev_pm_ops,
 276         },
 277         .probe          = funnel_probe,
 278         .remove         = funnel_remove,
 279         .id_table       = funnel_ids,
 280 };
 281
 282 module_amba_driver(funnel_driver);
 283
 284 MODULE_LICENSE("GPL v2");
 285 MODULE_DESCRIPTION("CoreSight Funnel driver");