drivers/hwtracing/coresight/coresight-tpiu.c

   1 /* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
   2  *
   3  * Description: CoreSight Trace Port Interface Unit driver
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 and
   7  * only version 2 as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/device.h>
  18 #include <linux/io.h>
  19 #include <linux/err.h>
  20 #include <linux/slab.h>
  21 #include <linux/pm_runtime.h>
  22 #include <linux/coresight.h>
  23 #include <linux/amba/bus.h>
  24 #include <linux/clk.h>
  25
  26 #include "coresight-priv.h"
  27
  28 #define TPIU_SUPP_PORTSZ        0x000
  29 #define TPIU_CURR_PORTSZ        0x004
  30 #define TPIU_SUPP_TRIGMODES     0x100
  31 #define TPIU_TRIG_CNTRVAL       0x104
  32 #define TPIU_TRIG_MULT          0x108
  33 #define TPIU_SUPP_TESTPATM      0x200
  34 #define TPIU_CURR_TESTPATM      0x204
  35 #define TPIU_TEST_PATREPCNTR    0x208
  36 #define TPIU_FFSR               0x300
  37 #define TPIU_FFCR               0x304
  38 #define TPIU_FSYNC_CNTR         0x308
  39 #define TPIU_EXTCTL_INPORT      0x400
  40 #define TPIU_EXTCTL_OUTPORT     0x404
  41 #define TPIU_ITTRFLINACK        0xee4
  42 #define TPIU_ITTRFLIN           0xee8
  43 #define TPIU_ITATBDATA0         0xeec
  44 #define TPIU_ITATBCTR2          0xef0
  45 #define TPIU_ITATBCTR1          0xef4
  46 #define TPIU_ITATBCTR0          0xef8
  47
  48 /** register definition **/
  49 /* FFSR - 0x300 */
  50 #define FFSR_FT_STOPPED_BIT     1
  51 /* FFCR - 0x304 */
  52 #define FFCR_FON_MAN_BIT        6
  53 #define FFCR_FON_MAN            BIT(6)
  54 #define FFCR_STOP_FI            BIT(12)
  55
  56 /**
  57  * @base:       memory mapped base address for this component.
  58  * @dev:        the device entity associated to this component.
  59  * @atclk:      optional clock for the core parts of the TPIU.
  60  * @csdev:      component vitals needed by the framework.
  61  */
  62 struct tpiu_drvdata {
  63         void __iomem            *base;
  64         struct device           *dev;
  65         struct clk              *atclk;
  66         struct coresight_device *csdev;
  67 };
  68
  69 static void tpiu_enable_hw(struct tpiu_drvdata *drvdata)
  70 {
  71         CS_UNLOCK(drvdata->base);
  72
  73         /* TODO: fill this up */
  74
  75         CS_LOCK(drvdata->base);
  76 }
  77
  78 static int tpiu_enable(struct coresight_device *csdev, u32 mode)
  79 {
  80         struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
  81
  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
 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 = { 0 };
 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.type = CORESIGHT_DEV_TYPE_SINK;
 166         desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_PORT;
 167         desc.ops = &tpiu_cs_ops;
 168         desc.pdata = pdata;
 169         desc.dev = dev;
 170         drvdata->csdev = coresight_register(&desc);
 171         if (IS_ERR(drvdata->csdev))
 172                 return PTR_ERR(drvdata->csdev);
 173
 174         return 0;
 175 }
 176
 177 #ifdef CONFIG_PM
 178 static int tpiu_runtime_suspend(struct device *dev)
 179 {
 180         struct tpiu_drvdata *drvdata = dev_get_drvdata(dev);
 181
 182         if (drvdata && !IS_ERR(drvdata->atclk))
 183                 clk_disable_unprepare(drvdata->atclk);
 184
 185         return 0;
 186 }
 187
 188 static int tpiu_runtime_resume(struct device *dev)
 189 {
 190         struct tpiu_drvdata *drvdata = dev_get_drvdata(dev);
 191
 192         if (drvdata && !IS_ERR(drvdata->atclk))
 193                 clk_prepare_enable(drvdata->atclk);
 194
 195         return 0;
 196 }
 197 #endif
 198
 199 static const struct dev_pm_ops tpiu_dev_pm_ops = {
 200         SET_RUNTIME_PM_OPS(tpiu_runtime_suspend, tpiu_runtime_resume, NULL)
 201 };
 202
 203 static struct amba_id tpiu_ids[] = {
 204         {
 205                 .id     = 0x0003b912,
 206                 .mask   = 0x0003ffff,
 207         },
 208         {
 209                 .id     = 0x0004b912,
 210                 .mask   = 0x0007ffff,
 211         },
 212         { 0, 0},
 213 };
 214
 215 static struct amba_driver tpiu_driver = {
 216         .drv = {
 217                 .name   = "coresight-tpiu",
 218                 .owner  = THIS_MODULE,
 219                 .pm     = &tpiu_dev_pm_ops,
 220                 .suppress_bind_attrs = true,
 221         },
 222         .probe          = tpiu_probe,
 223         .id_table       = tpiu_ids,
 224 };
 225 builtin_amba_driver(tpiu_driver);