kernel/drivers/hwtracing/coresight/coresight-tpiu.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/device.h>
  17 #include <linux/io.h>
  18 #include <linux/err.h>
  19 #include <linux/slab.h>
  20 #include <linux/pm_runtime.h>
  21 #include <linux/coresight.h>
  22 #include <linux/amba/bus.h>
  23 #include <linux/clk.h>
  24
  25 #include "coresight-priv.h"
  26
  27 #define TPIU_SUPP_PORTSZ        0x000
  28 #define TPIU_CURR_PORTSZ        0x004
  29 #define TPIU_SUPP_TRIGMODES     0x100
  30 #define TPIU_TRIG_CNTRVAL       0x104
  31 #define TPIU_TRIG_MULT          0x108
  32 #define TPIU_SUPP_TESTPATM      0x200
  33 #define TPIU_CURR_TESTPATM      0x204
  34 #define TPIU_TEST_PATREPCNTR    0x208
  35 #define TPIU_FFSR               0x300
  36 #define TPIU_FFCR               0x304
  37 #define TPIU_FSYNC_CNTR         0x308
  38 #define TPIU_EXTCTL_INPORT      0x400
  39 #define TPIU_EXTCTL_OUTPORT     0x404
  40 #define TPIU_ITTRFLINACK        0xee4
  41 #define TPIU_ITTRFLIN           0xee8
  42 #define TPIU_ITATBDATA0         0xeec
  43 #define TPIU_ITATBCTR2          0xef0
  44 #define TPIU_ITATBCTR1          0xef4
  45 #define TPIU_ITATBCTR0          0xef8
  46
  47 /** register definition **/
  48 /* FFCR - 0x304 */
  49 #define FFCR_FON_MAN            BIT(6)
  50
  51 /**
  52  * @base:       memory mapped base address for this component.
  53  * @dev:        the device entity associated to this component.
  54  * @atclk:      optional clock for the core parts of the TPIU.
  55  * @csdev:      component vitals needed by the framework.
  56  */
  57 struct tpiu_drvdata {
  58         void __iomem            *base;
  59         struct device           *dev;
  60         struct clk              *atclk;
  61         struct coresight_device *csdev;
  62 };
  63
  64 static void tpiu_enable_hw(struct tpiu_drvdata *drvdata)
  65 {
  66         CS_UNLOCK(drvdata->base);
  67
  68         /* TODO: fill this up */
  69
  70         CS_LOCK(drvdata->base);
  71 }
  72
  73 static int tpiu_enable(struct coresight_device *csdev)
  74 {
  75         struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
  76
  77         pm_runtime_get_sync(csdev->dev.parent);
  78         tpiu_enable_hw(drvdata);
  79
  80         dev_info(drvdata->dev, "TPIU enabled\n");
  81         return 0;
  82 }
  83
  84 static void tpiu_disable_hw(struct tpiu_drvdata *drvdata)
  85 {
  86         CS_UNLOCK(drvdata->base);
  87
  88         /* Clear formatter controle reg. */
  89         writel_relaxed(0x0, drvdata->base + TPIU_FFCR);
  90         /* Generate manual flush */
  91         writel_relaxed(FFCR_FON_MAN, drvdata->base + TPIU_FFCR);
  92
  93         CS_LOCK(drvdata->base);
  94 }
  95
  96 static void tpiu_disable(struct coresight_device *csdev)
  97 {
  98         struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
  99
 100         tpiu_disable_hw(drvdata);
 101         pm_runtime_put(csdev->dev.parent);
 102
 103         dev_info(drvdata->dev, "TPIU disabled\n");
 104 }
 105
 106 static const struct coresight_ops_sink tpiu_sink_ops = {
 107         .enable         = tpiu_enable,
 108         .disable        = tpiu_disable,
 109 };
 110
 111 static const struct coresight_ops tpiu_cs_ops = {
 112         .sink_ops       = &tpiu_sink_ops,
 113 };
 114
 115 static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
 116 {
 117         int ret;
 118         void __iomem *base;
 119         struct device *dev = &adev->dev;
 120         struct coresight_platform_data *pdata = NULL;
 121         struct tpiu_drvdata *drvdata;
 122         struct resource *res = &adev->res;
 123         struct coresight_desc *desc;
 124         struct device_node *np = adev->dev.of_node;
 125
 126         if (np) {
 127                 pdata = of_get_coresight_platform_data(dev, np);
 128                 if (IS_ERR(pdata))
 129                         return PTR_ERR(pdata);
 130                 adev->dev.platform_data = pdata;
 131         }
 132
 133         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 134         if (!drvdata)
 135                 return -ENOMEM;
 136
 137         drvdata->dev = &adev->dev;
 138         drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
 139         if (!IS_ERR(drvdata->atclk)) {
 140                 ret = clk_prepare_enable(drvdata->atclk);
 141                 if (ret)
 142                         return ret;
 143         }
 144         dev_set_drvdata(dev, drvdata);
 145
 146         /* Validity for the resource is already checked by the AMBA core */
 147         base = devm_ioremap_resource(dev, res);
 148         if (IS_ERR(base))
 149                 return PTR_ERR(base);
 150
 151         drvdata->base = base;
 152
 153         /* Disable tpiu to support older devices */
 154         tpiu_disable_hw(drvdata);
 155
 156         pm_runtime_put(&adev->dev);
 157
 158         desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
 159         if (!desc)
 160                 return -ENOMEM;
 161
 162         desc->type = CORESIGHT_DEV_TYPE_SINK;
 163         desc->subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_PORT;
 164         desc->ops = &tpiu_cs_ops;
 165         desc->pdata = pdata;
 166         desc->dev = dev;
 167         drvdata->csdev = coresight_register(desc);
 168         if (IS_ERR(drvdata->csdev))
 169                 return PTR_ERR(drvdata->csdev);
 170
 171         dev_info(dev, "TPIU initialized\n");
 172         return 0;
 173 }
 174
 175 static int tpiu_remove(struct amba_device *adev)
 176 {
 177         struct tpiu_drvdata *drvdata = amba_get_drvdata(adev);
 178
 179         coresight_unregister(drvdata->csdev);
 180         return 0;
 181 }
 182
 183 #ifdef CONFIG_PM
 184 static int tpiu_runtime_suspend(struct device *dev)
 185 {
 186         struct tpiu_drvdata *drvdata = dev_get_drvdata(dev);
 187
 188         if (drvdata && !IS_ERR(drvdata->atclk))
 189                 clk_disable_unprepare(drvdata->atclk);
 190
 191         return 0;
 192 }
 193
 194 static int tpiu_runtime_resume(struct device *dev)
 195 {
 196         struct tpiu_drvdata *drvdata = dev_get_drvdata(dev);
 197
 198         if (drvdata && !IS_ERR(drvdata->atclk))
 199                 clk_prepare_enable(drvdata->atclk);
 200
 201         return 0;
 202 }
 203 #endif
 204
 205 static const struct dev_pm_ops tpiu_dev_pm_ops = {
 206         SET_RUNTIME_PM_OPS(tpiu_runtime_suspend, tpiu_runtime_resume, NULL)
 207 };
 208
 209 static struct amba_id tpiu_ids[] = {
 210         {
 211                 .id     = 0x0003b912,
 212                 .mask   = 0x0003ffff,
 213         },
 214         {
 215                 .id     = 0x0004b912,
 216                 .mask   = 0x0007ffff,
 217         },
 218         { 0, 0},
 219 };
 220
 221 static struct amba_driver tpiu_driver = {
 222         .drv = {
 223                 .name   = "coresight-tpiu",
 224                 .owner  = THIS_MODULE,
 225                 .pm     = &tpiu_dev_pm_ops,
 226         },
 227         .probe          = tpiu_probe,
 228         .remove         = tpiu_remove,
 229         .id_table       = tpiu_ids,
 230 };
 231
 232 module_amba_driver(tpiu_driver);
 233
 234 MODULE_LICENSE("GPL v2");
 235 MODULE_DESCRIPTION("CoreSight Trace Port Interface Unit driver");