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/err.h>
  19 #include <linux/init.h>
  20 #include <linux/io.h>
  21 #include <linux/kernel.h>
  22 #include <linux/of.h>
  23 #include <linux/pm_runtime.h>
  24 #include <linux/slab.h>
  25
  26 #include "coresight-priv.h"
  27
  28 #define REPLICATOR_IDFILTER0            0x000
  29 #define REPLICATOR_IDFILTER1            0x004
  30
  31 /**
  32  * struct replicator_state - specifics associated to a replicator component
  33  * @base:       memory mapped base address for this component.
  34  * @dev:        the device entity associated with this component
  35  * @atclk:      optional clock for the core parts of the replicator.
  36  * @csdev:      component vitals needed by the framework
  37  */
  38 struct replicator_state {
  39         void __iomem            *base;
  40         struct device           *dev;
  41         struct clk              *atclk;
  42         struct coresight_device *csdev;
  43 };
  44
  45 static int replicator_enable(struct coresight_device *csdev, int inport,
  46                               int outport)
  47 {
  48         struct replicator_state *drvdata = dev_get_drvdata(csdev->dev.parent);
  49
  50         pm_runtime_get_sync(drvdata->dev);
  51
  52         CS_UNLOCK(drvdata->base);
  53
  54         /*
  55          * Ensure that the other port is disabled
  56          * 0x00 - passing through the replicator unimpeded
  57          * 0xff - disable (or impede) the flow of ATB data
  58          */
  59         if (outport == 0) {
  60                 writel_relaxed(0x00, drvdata->base + REPLICATOR_IDFILTER0);
  61                 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
  62         } else {
  63                 writel_relaxed(0x00, drvdata->base + REPLICATOR_IDFILTER1);
  64                 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
  65         }
  66
  67         CS_LOCK(drvdata->base);
  68
  69         dev_info(drvdata->dev, "REPLICATOR enabled\n");
  70         return 0;
  71 }
  72
  73 static void replicator_disable(struct coresight_device *csdev, int inport,
  74                                 int outport)
  75 {
  76         struct replicator_state *drvdata = dev_get_drvdata(csdev->dev.parent);
  77
  78         CS_UNLOCK(drvdata->base);
  79
  80         /* disable the flow of ATB data through port */
  81         if (outport == 0)
  82                 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
  83         else
  84                 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
  85
  86         CS_LOCK(drvdata->base);
  87
  88         pm_runtime_put(drvdata->dev);
  89
  90         dev_info(drvdata->dev, "REPLICATOR disabled\n");
  91 }
  92
  93 static const struct coresight_ops_link replicator_link_ops = {
  94         .enable         = replicator_enable,
  95         .disable        = replicator_disable,
  96 };
  97
  98 static const struct coresight_ops replicator_cs_ops = {
  99         .link_ops       = &replicator_link_ops,
 100 };
 101
 102 static int replicator_probe(struct amba_device *adev, const struct amba_id *id)
 103 {
 104         int ret;
 105         struct device *dev = &adev->dev;
 106         struct resource *res = &adev->res;
 107         struct coresight_platform_data *pdata = NULL;
 108         struct replicator_state *drvdata;
 109         struct coresight_desc *desc;
 110         struct device_node *np = adev->dev.of_node;
 111         void __iomem *base;
 112
 113         if (np) {
 114                 pdata = of_get_coresight_platform_data(dev, np);
 115                 if (IS_ERR(pdata))
 116                         return PTR_ERR(pdata);
 117                 adev->dev.platform_data = pdata;
 118         }
 119
 120         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 121         if (!drvdata)
 122                 return -ENOMEM;
 123
 124         drvdata->dev = &adev->dev;
 125         drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
 126         if (!IS_ERR(drvdata->atclk)) {
 127                 ret = clk_prepare_enable(drvdata->atclk);
 128                 if (ret)
 129                         return ret;
 130         }
 131
 132         /* Validity for the resource is already checked by the AMBA core */
 133         base = devm_ioremap_resource(dev, res);
 134         if (IS_ERR(base))
 135                 return PTR_ERR(base);
 136
 137         drvdata->base = base;
 138         dev_set_drvdata(dev, drvdata);
 139         pm_runtime_put(&adev->dev);
 140
 141         desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
 142         if (!desc)
 143                 return -ENOMEM;
 144
 145         desc->type = CORESIGHT_DEV_TYPE_LINK;
 146         desc->subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT;
 147         desc->ops = &replicator_cs_ops;
 148         desc->pdata = adev->dev.platform_data;
 149         desc->dev = &adev->dev;
 150         drvdata->csdev = coresight_register(desc);
 151         if (IS_ERR(drvdata->csdev))
 152                 return PTR_ERR(drvdata->csdev);
 153
 154         dev_info(dev, "%s initialized\n", (char *)id->data);
 155         return 0;
 156 }
 157
 158 static int replicator_remove(struct amba_device *adev)
 159 {
 160         struct replicator_state *drvdata = amba_get_drvdata(adev);
 161
 162         pm_runtime_disable(&adev->dev);
 163         coresight_unregister(drvdata->csdev);
 164         return 0;
 165 }
 166
 167 #ifdef CONFIG_PM
 168 static int replicator_runtime_suspend(struct device *dev)
 169 {
 170         struct replicator_state *drvdata = dev_get_drvdata(dev);
 171
 172         if (drvdata && !IS_ERR(drvdata->atclk))
 173                 clk_disable_unprepare(drvdata->atclk);
 174
 175         return 0;
 176 }
 177
 178 static int replicator_runtime_resume(struct device *dev)
 179 {
 180         struct replicator_state *drvdata = dev_get_drvdata(dev);
 181
 182         if (drvdata && !IS_ERR(drvdata->atclk))
 183                 clk_prepare_enable(drvdata->atclk);
 184
 185         return 0;
 186 }
 187 #endif
 188
 189 static const struct dev_pm_ops replicator_dev_pm_ops = {
 190         SET_RUNTIME_PM_OPS(replicator_runtime_suspend,
 191                            replicator_runtime_resume,
 192                            NULL)
 193 };
 194
 195 static struct amba_id replicator_ids[] = {
 196         {
 197                 .id     = 0x0003b909,
 198                 .mask   = 0x0003ffff,
 199                 .data   = "REPLICATOR 1.0",
 200         },
 201         { 0, 0 },
 202 };
 203
 204 static struct amba_driver replicator_driver = {
 205         .drv = {
 206                 .name   = "coresight-replicator-qcom",
 207                 .pm     = &replicator_dev_pm_ops,
 208         },
 209         .probe          = replicator_probe,
 210         .remove         = replicator_remove,
 211         .id_table       = replicator_ids,
 212 };
 213
 214 module_amba_driver(replicator_driver);