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         funnel_enable_hw(drvdata, inport);
  73
  74         dev_info(drvdata->dev, "FUNNEL inport %d enabled\n", inport);
  75         return 0;
  76 }
  77
  78 static void funnel_disable_hw(struct funnel_drvdata *drvdata, int inport)
  79 {
  80         u32 functl;
  81
  82         CS_UNLOCK(drvdata->base);
  83
  84         functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
  85         functl &= ~(1 << inport);
  86         writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
  87
  88         CS_LOCK(drvdata->base);
  89 }
  90
  91 static void funnel_disable(struct coresight_device *csdev, int inport,
  92                            int outport)
  93 {
  94         struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
  95
  96         funnel_disable_hw(drvdata, inport);
  97
  98         dev_info(drvdata->dev, "FUNNEL inport %d disabled\n", inport);
  99 }
 100
 101 static const struct coresight_ops_link funnel_link_ops = {
 102         .enable         = funnel_enable,
 103         .disable        = funnel_disable,
 104 };
 105
 106 static const struct coresight_ops funnel_cs_ops = {
 107         .link_ops       = &funnel_link_ops,
 108 };
 109
 110 static ssize_t priority_show(struct device *dev,
 111                              struct device_attribute *attr, char *buf)
 112 {
 113         struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
 114         unsigned long val = drvdata->priority;
 115
 116         return sprintf(buf, "%#lx\n", val);
 117 }
 118
 119 static ssize_t priority_store(struct device *dev,
 120                               struct device_attribute *attr,
 121                               const char *buf, size_t size)
 122 {
 123         int ret;
 124         unsigned long val;
 125         struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
 126
 127         ret = kstrtoul(buf, 16, &val);
 128         if (ret)
 129                 return ret;
 130
 131         drvdata->priority = val;
 132         return size;
 133 }
 134 static DEVICE_ATTR_RW(priority);
 135
 136 static u32 get_funnel_ctrl_hw(struct funnel_drvdata *drvdata)
 137 {
 138         u32 functl;
 139
 140         CS_UNLOCK(drvdata->base);
 141         functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
 142         CS_LOCK(drvdata->base);
 143
 144         return functl;
 145 }
 146
 147 static ssize_t funnel_ctrl_show(struct device *dev,
 148                              struct device_attribute *attr, char *buf)
 149 {
 150         u32 val;
 151         struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
 152
 153         pm_runtime_get_sync(drvdata->dev);
 154
 155         val = get_funnel_ctrl_hw(drvdata);
 156
 157         pm_runtime_put(drvdata->dev);
 158
 159         return sprintf(buf, "%#x\n", val);
 160 }
 161 static DEVICE_ATTR_RO(funnel_ctrl);
 162
 163 static struct attribute *coresight_funnel_attrs[] = {
 164         &dev_attr_funnel_ctrl.attr,
 165         &dev_attr_priority.attr,
 166         NULL,
 167 };
 168 ATTRIBUTE_GROUPS(coresight_funnel);
 169
 170 static int funnel_probe(struct amba_device *adev, const struct amba_id *id)
 171 {
 172         int ret;
 173         void __iomem *base;
 174         struct device *dev = &adev->dev;
 175         struct coresight_platform_data *pdata = NULL;
 176         struct funnel_drvdata *drvdata;
 177         struct resource *res = &adev->res;
 178         struct coresight_desc *desc;
 179         struct device_node *np = adev->dev.of_node;
 180
 181         if (np) {
 182                 pdata = of_get_coresight_platform_data(dev, np);
 183                 if (IS_ERR(pdata))
 184                         return PTR_ERR(pdata);
 185                 adev->dev.platform_data = pdata;
 186         }
 187
 188         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 189         if (!drvdata)
 190                 return -ENOMEM;
 191
 192         drvdata->dev = &adev->dev;
 193         drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
 194         if (!IS_ERR(drvdata->atclk)) {
 195                 ret = clk_prepare_enable(drvdata->atclk);
 196                 if (ret)
 197                         return ret;
 198         }
 199         dev_set_drvdata(dev, drvdata);
 200
 201         /* Validity for the resource is already checked by the AMBA core */
 202         base = devm_ioremap_resource(dev, res);
 203         if (IS_ERR(base))
 204                 return PTR_ERR(base);
 205
 206         drvdata->base = base;
 207         pm_runtime_put(&adev->dev);
 208
 209         desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
 210         if (!desc)
 211                 return -ENOMEM;
 212
 213         desc->type = CORESIGHT_DEV_TYPE_LINK;
 214         desc->subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG;
 215         desc->ops = &funnel_cs_ops;
 216         desc->pdata = pdata;
 217         desc->dev = dev;
 218         desc->groups = coresight_funnel_groups;
 219         drvdata->csdev = coresight_register(desc);
 220         if (IS_ERR(drvdata->csdev))
 221                 return PTR_ERR(drvdata->csdev);
 222
 223         dev_info(dev, "FUNNEL initialized\n");
 224         return 0;
 225 }
 226
 227 #ifdef CONFIG_PM
 228 static int funnel_runtime_suspend(struct device *dev)
 229 {
 230         struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
 231
 232         if (drvdata && !IS_ERR(drvdata->atclk))
 233                 clk_disable_unprepare(drvdata->atclk);
 234
 235         return 0;
 236 }
 237
 238 static int funnel_runtime_resume(struct device *dev)
 239 {
 240         struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
 241
 242         if (drvdata && !IS_ERR(drvdata->atclk))
 243                 clk_prepare_enable(drvdata->atclk);
 244
 245         return 0;
 246 }
 247 #endif
 248
 249 static const struct dev_pm_ops funnel_dev_pm_ops = {
 250         SET_RUNTIME_PM_OPS(funnel_runtime_suspend, funnel_runtime_resume, NULL)
 251 };
 252
 253 static struct amba_id funnel_ids[] = {
 254         {
 255                 .id     = 0x0003b908,
 256                 .mask   = 0x0003ffff,
 257         },
 258         { 0, 0},
 259 };
 260
 261 static struct amba_driver funnel_driver = {
 262         .drv = {
 263                 .name   = "coresight-funnel",
 264                 .owner  = THIS_MODULE,
 265                 .pm     = &funnel_dev_pm_ops,
 266                 .suppress_bind_attrs = true,
 267         },
 268         .probe          = funnel_probe,
 269         .id_table       = funnel_ids,
 270 };
 271
 272 module_amba_driver(funnel_driver);
 273
 274 MODULE_LICENSE("GPL v2");
 275 MODULE_DESCRIPTION("CoreSight Funnel driver");