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