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 /* FFSR - 0x300 */
  49 #define FFSR_FT_STOPPED_BIT     1
  50 /* FFCR - 0x304 */
  51 #define FFCR_FON_MAN_BIT        6
  52 #define FFCR_FON_MAN            BIT(6)
  53 #define FFCR_STOP_FI            BIT(12)
  54
  55 /**
  56  * @base:       memory mapped base address for this component.
  57  * @dev:        the device entity associated to this component.
  58  * @atclk:      optional clock for the core parts of the TPIU.
  59  * @csdev:      component vitals needed by the framework.
  60  */
  61 struct tpiu_drvdata {
  62         void __iomem            *base;
  63         struct device           *dev;
  64         struct clk              *atclk;
  65         struct coresight_device *csdev;
  66 };
  67
  68 static void tpiu_enable_hw(struct tpiu_drvdata *drvdata)
  69 {
  70         CS_UNLOCK(drvdata->base);
  71
  72         /* TODO: fill this up */
  73
  74         CS_LOCK(drvdata->base);
  75 }
  76
  77 static int tpiu_enable(struct coresight_device *csdev)
  78 {
  79         struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
  80
  81         pm_runtime_get_sync(csdev->dev.parent);
  82         tpiu_enable_hw(drvdata);
  83
  84         dev_info(drvdata->dev, "TPIU enabled\n");
  85         return 0;
  86 }
  87
  88 static void tpiu_disable_hw(struct tpiu_drvdata *drvdata)
  89 {
  90         CS_UNLOCK(drvdata->base);
  91
  92         /* Clear formatter and stop on flush */
  93         writel_relaxed(FFCR_STOP_FI, drvdata->base + TPIU_FFCR);
  94         /* Generate manual flush */
  95         writel_relaxed(FFCR_STOP_FI | FFCR_FON_MAN, drvdata->base + TPIU_FFCR);
  96         /* Wait for flush to complete */
  97         coresight_timeout(drvdata->base, TPIU_FFCR, FFCR_FON_MAN_BIT, 0);
  98         /* Wait for formatter to stop */
  99         coresight_timeout(drvdata->base, TPIU_FFSR, FFSR_FT_STOPPED_BIT, 1);
 100
 101         CS_LOCK(drvdata->base);
 102 }
 103
 104 static void tpiu_disable(struct coresight_device *csdev)
 105 {
 106         struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
 107
 108         tpiu_disable_hw(drvdata);
 109         pm_runtime_put(csdev->dev.parent);
 110
 111         dev_info(drvdata->dev, "TPIU disabled\n");
 112 }
 113
 114 static const struct coresight_ops_sink tpiu_sink_ops = {
 115         .enable         = tpiu_enable,
 116         .disable        = tpiu_disable,
 117 };
 118
 119 static const struct coresight_ops tpiu_cs_ops = {
 120         .sink_ops       = &tpiu_sink_ops,
 121 };
 122
 123 static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
 124 {
 125         int ret;
 126         void __iomem *base;
 127         struct device *dev = &adev->dev;
 128         struct coresight_platform_data *pdata = NULL;
 129         struct tpiu_drvdata *drvdata;
 130         struct resource *res = &adev->res;
 131         struct coresight_desc *desc;
 132         struct device_node *np = adev->dev.of_node;
 133
 134         if (np) {
 135                 pdata = of_get_coresight_platform_data(dev, np);
 136                 if (IS_ERR(pdata))
 137                         return PTR_ERR(pdata);
 138                 adev->dev.platform_data = pdata;
 139         }
 140
 141         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 142         if (!drvdata)
 143                 return -ENOMEM;
 144
 145         drvdata->dev = &adev->dev;
 146         drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
 147         if (!IS_ERR(drvdata->atclk)) {
 148                 ret = clk_prepare_enable(drvdata->atclk);
 149                 if (ret)
 150                         return ret;
 151         }
 152         dev_set_drvdata(dev, drvdata);
 153
 154         /* Validity for the resource is already checked by the AMBA core */
 155         base = devm_ioremap_resource(dev, res);
 156         if (IS_ERR(base))
 157                 return PTR_ERR(base);
 158
 159         drvdata->base = base;
 160
 161         /* Disable tpiu to support older devices */
 162         tpiu_disable_hw(drvdata);
 163
 164         pm_runtime_put(&adev->dev);
 165
 166         desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
 167         if (!desc)
 168                 return -ENOMEM;
 169
 170         desc->type = CORESIGHT_DEV_TYPE_SINK;
 171         desc->subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_PORT;
 172         desc->ops = &tpiu_cs_ops;
 173         desc->pdata = pdata;
 174         desc->dev = dev;
 175         drvdata->csdev = coresight_register(desc);
 176         if (IS_ERR(drvdata->csdev))
 177                 return PTR_ERR(drvdata->csdev);
 178
 179         dev_info(dev, "TPIU initialized\n");
 180         return 0;
 181 }
 182
 183 static int tpiu_remove(struct amba_device *adev)
 184 {
 185         struct tpiu_drvdata *drvdata = amba_get_drvdata(adev);
 186
 187         coresight_unregister(drvdata->csdev);
 188         return 0;
 189 }
 190
 191 #ifdef CONFIG_PM
 192 static int tpiu_runtime_suspend(struct device *dev)
 193 {
 194         struct tpiu_drvdata *drvdata = dev_get_drvdata(dev);
 195
 196         if (drvdata && !IS_ERR(drvdata->atclk))
 197                 clk_disable_unprepare(drvdata->atclk);
 198
 199         return 0;
 200 }
 201
 202 static int tpiu_runtime_resume(struct device *dev)
 203 {
 204         struct tpiu_drvdata *drvdata = dev_get_drvdata(dev);
 205
 206         if (drvdata && !IS_ERR(drvdata->atclk))
 207                 clk_prepare_enable(drvdata->atclk);
 208
 209         return 0;
 210 }
 211 #endif
 212
 213 static const struct dev_pm_ops tpiu_dev_pm_ops = {
 214         SET_RUNTIME_PM_OPS(tpiu_runtime_suspend, tpiu_runtime_resume, NULL)
 215 };
 216
 217 static struct amba_id tpiu_ids[] = {
 218         {
 219                 .id     = 0x0003b912,
 220                 .mask   = 0x0003ffff,
 221         },
 222         {
 223                 .id     = 0x0004b912,
 224                 .mask   = 0x0007ffff,
 225         },
 226         { 0, 0},
 227 };
 228
 229 static struct amba_driver tpiu_driver = {
 230         .drv = {
 231                 .name   = "coresight-tpiu",
 232                 .owner  = THIS_MODULE,
 233                 .pm     = &tpiu_dev_pm_ops,
 234         },
 235         .probe          = tpiu_probe,
 236         .remove         = tpiu_remove,
 237         .id_table       = tpiu_ids,
 238 };
 239
 240 module_amba_driver(tpiu_driver);
 241
 242 MODULE_LICENSE("GPL v2");
 243 MODULE_DESCRIPTION("CoreSight Trace Port Interface Unit driver");