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         CS_UNLOCK(drvdata->base);
  51
  52         /*
  53          * Ensure that the other port is disabled
  54          * 0x00 - passing through the replicator unimpeded
  55          * 0xff - disable (or impede) the flow of ATB data
  56          */
  57         if (outport == 0) {
  58                 writel_relaxed(0x00, drvdata->base + REPLICATOR_IDFILTER0);
  59                 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
  60         } else {
  61                 writel_relaxed(0x00, drvdata->base + REPLICATOR_IDFILTER1);
  62                 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
  63         }
  64
  65         CS_LOCK(drvdata->base);
  66
  67         dev_info(drvdata->dev, "REPLICATOR enabled\n");
  68         return 0;
  69 }
  70
  71 static void replicator_disable(struct coresight_device *csdev, int inport,
  72                                 int outport)
  73 {
  74         struct replicator_state *drvdata = dev_get_drvdata(csdev->dev.parent);
  75
  76         CS_UNLOCK(drvdata->base);
  77
  78         /* disable the flow of ATB data through port */
  79         if (outport == 0)
  80                 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
  81         else
  82                 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
  83
  84         CS_LOCK(drvdata->base);
  85
  86         dev_info(drvdata->dev, "REPLICATOR disabled\n");
  87 }
  88
  89 static const struct coresight_ops_link replicator_link_ops = {
  90         .enable         = replicator_enable,
  91         .disable        = replicator_disable,
  92 };
  93
  94 static const struct coresight_ops replicator_cs_ops = {
  95         .link_ops       = &replicator_link_ops,
  96 };
  97
  98 static int replicator_probe(struct amba_device *adev, const struct amba_id *id)
  99 {
 100         int ret;
 101         struct device *dev = &adev->dev;
 102         struct resource *res = &adev->res;
 103         struct coresight_platform_data *pdata = NULL;
 104         struct replicator_state *drvdata;
 105         struct coresight_desc desc = { 0 };
 106         struct device_node *np = adev->dev.of_node;
 107         void __iomem *base;
 108
 109         if (np) {
 110                 pdata = of_get_coresight_platform_data(dev, np);
 111                 if (IS_ERR(pdata))
 112                         return PTR_ERR(pdata);
 113                 adev->dev.platform_data = pdata;
 114         }
 115
 116         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 117         if (!drvdata)
 118                 return -ENOMEM;
 119
 120         drvdata->dev = &adev->dev;
 121         drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
 122         if (!IS_ERR(drvdata->atclk)) {
 123                 ret = clk_prepare_enable(drvdata->atclk);
 124                 if (ret)
 125                         return ret;
 126         }
 127
 128         /* Validity for the resource is already checked by the AMBA core */
 129         base = devm_ioremap_resource(dev, res);
 130         if (IS_ERR(base))
 131                 return PTR_ERR(base);
 132
 133         drvdata->base = base;
 134         dev_set_drvdata(dev, drvdata);
 135         pm_runtime_put(&adev->dev);
 136
 137         desc.type = CORESIGHT_DEV_TYPE_LINK;
 138         desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT;
 139         desc.ops = &replicator_cs_ops;
 140         desc.pdata = adev->dev.platform_data;
 141         desc.dev = &adev->dev;
 142         drvdata->csdev = coresight_register(&desc);
 143         if (IS_ERR(drvdata->csdev))
 144                 return PTR_ERR(drvdata->csdev);
 145
 146         dev_info(dev, "%s initialized\n", (char *)id->data);
 147         return 0;
 148 }
 149
 150 #ifdef CONFIG_PM
 151 static int replicator_runtime_suspend(struct device *dev)
 152 {
 153         struct replicator_state *drvdata = dev_get_drvdata(dev);
 154
 155         if (drvdata && !IS_ERR(drvdata->atclk))
 156                 clk_disable_unprepare(drvdata->atclk);
 157
 158         return 0;
 159 }
 160
 161 static int replicator_runtime_resume(struct device *dev)
 162 {
 163         struct replicator_state *drvdata = dev_get_drvdata(dev);
 164
 165         if (drvdata && !IS_ERR(drvdata->atclk))
 166                 clk_prepare_enable(drvdata->atclk);
 167
 168         return 0;
 169 }
 170 #endif
 171
 172 static const struct dev_pm_ops replicator_dev_pm_ops = {
 173         SET_RUNTIME_PM_OPS(replicator_runtime_suspend,
 174                            replicator_runtime_resume,
 175                            NULL)
 176 };
 177
 178 static struct amba_id replicator_ids[] = {
 179         {
 180                 .id     = 0x0003b909,
 181                 .mask   = 0x0003ffff,
 182                 .data   = "REPLICATOR 1.0",
 183         },
 184         { 0, 0 },
 185 };
 186
 187 static struct amba_driver replicator_driver = {
 188         .drv = {
 189                 .name   = "coresight-replicator-qcom",
 190                 .pm     = &replicator_dev_pm_ops,
 191                 .suppress_bind_attrs = true,
 192         },
 193         .probe          = replicator_probe,
 194         .id_table       = replicator_ids,
 195 };
 196 builtin_amba_driver(replicator_driver);