kernel/drivers/hwtracing/coresight/coresight-replicator-qcom.c

   1 /*
   2  * Copyright (c) 2011-2015, The Linux Foundation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 and
   6  * only version 2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include <linux/amba/bus.h>
  15 #include <linux/clk.h>
  16 #include <linux/coresight.h>
  17 #include <linux/device.h>
  18 #include <linux/module.h>
  19 #include <linux/err.h>
  20 #include <linux/init.h>
  21 #include <linux/io.h>
  22 #include <linux/kernel.h>
  23 #include <linux/of.h>
  24 #include <linux/pm_runtime.h>
  25 #include <linux/slab.h>
  26
  27 #include "coresight-priv.h"
  28
  29 #define REPLICATOR_IDFILTER0            0x000
  30 #define REPLICATOR_IDFILTER1            0x004
  31
  32 /**
  33  * struct replicator_state - specifics associated to a replicator component
  34  * @base:       memory mapped base address for this component.
  35  * @dev:        the device entity associated with this component
  36  * @atclk:      optional clock for the core parts of the replicator.
  37  * @csdev:      component vitals needed by the framework
  38  */
  39 struct replicator_state {
  40         void __iomem            *base;
  41         struct device           *dev;
  42         struct clk              *atclk;
  43         struct coresight_device *csdev;
  44 };
  45
  46 static int replicator_enable(struct coresight_device *csdev, int inport,
  47                               int outport)
  48 {
  49         struct replicator_state *drvdata = dev_get_drvdata(csdev->dev.parent);
  50
  51         pm_runtime_get_sync(drvdata->dev);
  52
  53         CS_UNLOCK(drvdata->base);
  54
  55         /*
  56          * Ensure that the other port is disabled
  57          * 0x00 - passing through the replicator unimpeded
  58          * 0xff - disable (or impede) the flow of ATB data
  59          */
  60         if (outport == 0) {
  61                 writel_relaxed(0x00, drvdata->base + REPLICATOR_IDFILTER0);
  62                 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
  63         } else {
  64                 writel_relaxed(0x00, drvdata->base + REPLICATOR_IDFILTER1);
  65                 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
  66         }
  67
  68         CS_LOCK(drvdata->base);
  69
  70         dev_info(drvdata->dev, "REPLICATOR enabled\n");
  71         return 0;
  72 }
  73
  74 static void replicator_disable(struct coresight_device *csdev, int inport,
  75                                 int outport)
  76 {
  77         struct replicator_state *drvdata = dev_get_drvdata(csdev->dev.parent);
  78
  79         CS_UNLOCK(drvdata->base);
  80
  81         /* disable the flow of ATB data through port */
  82         if (outport == 0)
  83                 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
  84         else
  85                 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
  86
  87         CS_LOCK(drvdata->base);
  88
  89         pm_runtime_put(drvdata->dev);
  90
  91         dev_info(drvdata->dev, "REPLICATOR disabled\n");
  92 }
  93
  94 static const struct coresight_ops_link replicator_link_ops = {
  95         .enable         = replicator_enable,
  96         .disable        = replicator_disable,
  97 };
  98
  99 static const struct coresight_ops replicator_cs_ops = {
 100         .link_ops       = &replicator_link_ops,
 101 };
 102
 103 static int replicator_probe(struct amba_device *adev, const struct amba_id *id)
 104 {
 105         int ret;
 106         struct device *dev = &adev->dev;
 107         struct resource *res = &adev->res;
 108         struct coresight_platform_data *pdata = NULL;
 109         struct replicator_state *drvdata;
 110         struct coresight_desc *desc;
 111         struct device_node *np = adev->dev.of_node;
 112         void __iomem *base;
 113
 114         if (np) {
 115                 pdata = of_get_coresight_platform_data(dev, np);
 116                 if (IS_ERR(pdata))
 117                         return PTR_ERR(pdata);
 118                 adev->dev.platform_data = pdata;
 119         }
 120
 121         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 122         if (!drvdata)
 123                 return -ENOMEM;
 124
 125         drvdata->dev = &adev->dev;
 126         drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
 127         if (!IS_ERR(drvdata->atclk)) {
 128                 ret = clk_prepare_enable(drvdata->atclk);
 129                 if (ret)
 130                         return ret;
 131         }
 132
 133         /* Validity for the resource is already checked by the AMBA core */
 134         base = devm_ioremap_resource(dev, res);
 135         if (IS_ERR(base))
 136                 return PTR_ERR(base);
 137
 138         drvdata->base = base;
 139         dev_set_drvdata(dev, drvdata);
 140         pm_runtime_put(&adev->dev);
 141
 142         desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
 143         if (!desc)
 144                 return -ENOMEM;
 145
 146         desc->type = CORESIGHT_DEV_TYPE_LINK;
 147         desc->subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT;
 148         desc->ops = &replicator_cs_ops;
 149         desc->pdata = adev->dev.platform_data;
 150         desc->dev = &adev->dev;
 151         drvdata->csdev = coresight_register(desc);
 152         if (IS_ERR(drvdata->csdev))
 153                 return PTR_ERR(drvdata->csdev);
 154
 155         dev_info(dev, "%s initialized\n", (char *)id->data);
 156         return 0;
 157 }
 158
 159 static int replicator_remove(struct amba_device *adev)
 160 {
 161         struct replicator_state *drvdata = amba_get_drvdata(adev);
 162
 163         pm_runtime_disable(&adev->dev);
 164         coresight_unregister(drvdata->csdev);
 165         return 0;
 166 }
 167
 168 #ifdef CONFIG_PM
 169 static int replicator_runtime_suspend(struct device *dev)
 170 {
 171         struct replicator_state *drvdata = dev_get_drvdata(dev);
 172
 173         if (drvdata && !IS_ERR(drvdata->atclk))
 174                 clk_disable_unprepare(drvdata->atclk);
 175
 176         return 0;
 177 }
 178
 179 static int replicator_runtime_resume(struct device *dev)
 180 {
 181         struct replicator_state *drvdata = dev_get_drvdata(dev);
 182
 183         if (drvdata && !IS_ERR(drvdata->atclk))
 184                 clk_prepare_enable(drvdata->atclk);
 185
 186         return 0;
 187 }
 188 #endif
 189
 190 static const struct dev_pm_ops replicator_dev_pm_ops = {
 191         SET_RUNTIME_PM_OPS(replicator_runtime_suspend,
 192                            replicator_runtime_resume,
 193                            NULL)
 194 };
 195
 196 static struct amba_id replicator_ids[] = {
 197         {
 198                 .id     = 0x0003b909,
 199                 .mask   = 0x0003ffff,
 200                 .data   = "REPLICATOR 1.0",
 201         },
 202         { 0, 0 },
 203 };
 204
 205 static struct amba_driver replicator_driver = {
 206         .drv = {
 207                 .name   = "coresight-replicator-qcom",
 208                 .pm     = &replicator_dev_pm_ops,
 209         },
 210         .probe          = replicator_probe,
 211         .remove         = replicator_remove,
 212         .id_table       = replicator_ids,
 213 };
 214
 215 module_amba_driver(replicator_driver);