drivers/hwtracing/coresight/coresight-tpiu.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
   4  *
   5  * Description: CoreSight Trace Port Interface Unit driver
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/init.h>
  10 #include <linux/device.h>
  11 #include <linux/io.h>
  12 #include <linux/err.h>
  13 #include <linux/slab.h>
  14 #include <linux/pm_runtime.h>
  15 #include <linux/coresight.h>
  16 #include <linux/amba/bus.h>
  17 #include <linux/clk.h>
  18
  19 #include "coresight-priv.h"
  20
  21 #define TPIU_SUPP_PORTSZ        0x000
  22 #define TPIU_CURR_PORTSZ        0x004
  23 #define TPIU_SUPP_TRIGMODES     0x100
  24 #define TPIU_TRIG_CNTRVAL       0x104
  25 #define TPIU_TRIG_MULT          0x108
  26 #define TPIU_SUPP_TESTPATM      0x200
  27 #define TPIU_CURR_TESTPATM      0x204
  28 #define TPIU_TEST_PATREPCNTR    0x208
  29 #define TPIU_FFSR               0x300
  30 #define TPIU_FFCR               0x304
  31 #define TPIU_FSYNC_CNTR         0x308
  32 #define TPIU_EXTCTL_INPORT      0x400
  33 #define TPIU_EXTCTL_OUTPORT     0x404
  34 #define TPIU_ITTRFLINACK        0xee4
  35 #define TPIU_ITTRFLIN           0xee8
  36 #define TPIU_ITATBDATA0         0xeec
  37 #define TPIU_ITATBCTR2          0xef0
  38 #define TPIU_ITATBCTR1          0xef4
  39 #define TPIU_ITATBCTR0          0xef8
  40
  41 /** register definition **/
  42 /* FFSR - 0x300 */
  43 #define FFSR_FT_STOPPED_BIT     1
  44 /* FFCR - 0x304 */
  45 #define FFCR_FON_MAN_BIT        6
  46 #define FFCR_FON_MAN            BIT(6)
  47 #define FFCR_STOP_FI            BIT(12)
  48
  49 /**
  50  * @base:       memory mapped base address for this component.
  51  * @dev:        the device entity associated to this component.
  52  * @atclk:      optional clock for the core parts of the TPIU.
  53  * @csdev:      component vitals needed by the framework.
  54  */
  55 struct tpiu_drvdata {
  56         void __iomem            *base;
  57         struct device           *dev;
  58         struct clk              *atclk;
  59         struct coresight_device *csdev;
  60 };
  61
  62 static void tpiu_enable_hw(struct tpiu_drvdata *drvdata)
  63 {
  64         CS_UNLOCK(drvdata->base);
  65
  66         /* TODO: fill this up */
  67
  68         CS_LOCK(drvdata->base);
  69 }
  70
  71 static int tpiu_enable(struct coresight_device *csdev, u32 mode)
  72 {
  73         struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
  74
  75         tpiu_enable_hw(drvdata);
  76
  77         dev_info(drvdata->dev, "TPIU enabled\n");
  78         return 0;
  79 }
  80
  81 static void tpiu_disable_hw(struct tpiu_drvdata *drvdata)
  82 {
  83         CS_UNLOCK(drvdata->base);
  84
  85         /* Clear formatter and stop on flush */
  86         writel_relaxed(FFCR_STOP_FI, drvdata->base + TPIU_FFCR);
  87         /* Generate manual flush */
  88         writel_relaxed(FFCR_STOP_FI | FFCR_FON_MAN, drvdata->base + TPIU_FFCR);
  89         /* Wait for flush to complete */
  90         coresight_timeout(drvdata->base, TPIU_FFCR, FFCR_FON_MAN_BIT, 0);
  91         /* Wait for formatter to stop */
  92         coresight_timeout(drvdata->base, TPIU_FFSR, FFSR_FT_STOPPED_BIT, 1);
  93
  94         CS_LOCK(drvdata->base);
  95 }
  96
  97 static void tpiu_disable(struct coresight_device *csdev)
  98 {
  99         struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
 100
 101         tpiu_disable_hw(drvdata);
 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 = { 0 };
 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.type = CORESIGHT_DEV_TYPE_SINK;
 159         desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_PORT;
 160         desc.ops = &tpiu_cs_ops;
 161         desc.pdata = pdata;
 162         desc.dev = dev;
 163         drvdata->csdev = coresight_register(&desc);
 164
 165         return PTR_ERR_OR_ZERO(drvdata->csdev);
 166 }
 167
 168 #ifdef CONFIG_PM
 169 static int tpiu_runtime_suspend(struct device *dev)
 170 {
 171         struct tpiu_drvdata *drvdata = dev_get_drvdata(dev);
 172
 173         if (drvdata && !IS_ERR(drvdata->atclk))
 174                 clk_disable_unprepare(drvdata->atclk);
 175
 176         return 0;
 177 }
 178
 179 static int tpiu_runtime_resume(struct device *dev)
 180 {
 181         struct tpiu_drvdata *drvdata = dev_get_drvdata(dev);
 182
 183         if (drvdata && !IS_ERR(drvdata->atclk))
 184                 clk_prepare_enable(drvdata->atclk);
 185
 186         return 0;
 187 }
 188 #endif
 189
 190 static const struct dev_pm_ops tpiu_dev_pm_ops = {
 191         SET_RUNTIME_PM_OPS(tpiu_runtime_suspend, tpiu_runtime_resume, NULL)
 192 };
 193
 194 static const struct amba_id tpiu_ids[] = {
 195         {
 196                 .id     = 0x000bb912,
 197                 .mask   = 0x000fffff,
 198         },
 199         {
 200                 .id     = 0x0004b912,
 201                 .mask   = 0x0007ffff,
 202         },
 203         {
 204                 /* Coresight SoC-600 */
 205                 .id     = 0x000bb9e7,
 206                 .mask   = 0x000fffff,
 207         },
 208         { 0, 0},
 209 };
 210
 211 static struct amba_driver tpiu_driver = {
 212         .drv = {
 213                 .name   = "coresight-tpiu",
 214                 .owner  = THIS_MODULE,
 215                 .pm     = &tpiu_dev_pm_ops,
 216                 .suppress_bind_attrs = true,
 217         },
 218         .probe          = tpiu_probe,
 219         .id_table       = tpiu_ids,
 220 };
 221 builtin_amba_driver(tpiu_driver);