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 /* FFCR - 0x304 */
  50 #define FFCR_FON_MAN            BIT(6)
  51
  52 /**
  53  * @base:       memory mapped base address for this component.
  54  * @dev:        the device entity associated to this component.
  55  * @atclk:      optional clock for the core parts of the TPIU.
  56  * @csdev:      component vitals needed by the framework.
  57  */
  58 struct tpiu_drvdata {
  59         void __iomem            *base;
  60         struct device           *dev;
  61         struct clk              *atclk;
  62         struct coresight_device *csdev;
  63 };
  64
  65 static void tpiu_enable_hw(struct tpiu_drvdata *drvdata)
  66 {
  67         CS_UNLOCK(drvdata->base);
  68
  69         /* TODO: fill this up */
  70
  71         CS_LOCK(drvdata->base);
  72 }
  73
  74 static int tpiu_enable(struct coresight_device *csdev, u32 mode)
  75 {
  76         struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
  77
  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
 102         dev_info(drvdata->dev, "TPIU disabled\n");
 103 }
 104
 105 static const struct coresight_ops_sink tpiu_sink_ops = {
 106         .enable         = tpiu_enable,
 107         .disable        = tpiu_disable,
 108 };
 109
 110 static const struct coresight_ops tpiu_cs_ops = {
 111         .sink_ops       = &tpiu_sink_ops,
 112 };
 113
 114 static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
 115 {
 116         int ret;
 117         void __iomem *base;
 118         struct device *dev = &adev->dev;
 119         struct coresight_platform_data *pdata = NULL;
 120         struct tpiu_drvdata *drvdata;
 121         struct resource *res = &adev->res;
 122         struct coresight_desc desc = { 0 };
 123         struct device_node *np = adev->dev.of_node;
 124
 125         if (np) {
 126                 pdata = of_get_coresight_platform_data(dev, np);
 127                 if (IS_ERR(pdata))
 128                         return PTR_ERR(pdata);
 129                 adev->dev.platform_data = pdata;
 130         }
 131
 132         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 133         if (!drvdata)
 134                 return -ENOMEM;
 135
 136         drvdata->dev = &adev->dev;
 137         drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
 138         if (!IS_ERR(drvdata->atclk)) {
 139                 ret = clk_prepare_enable(drvdata->atclk);
 140                 if (ret)
 141                         return ret;
 142         }
 143         dev_set_drvdata(dev, drvdata);
 144
 145         /* Validity for the resource is already checked by the AMBA core */
 146         base = devm_ioremap_resource(dev, res);
 147         if (IS_ERR(base))
 148                 return PTR_ERR(base);
 149
 150         drvdata->base = base;
 151
 152         /* Disable tpiu to support older devices */
 153         tpiu_disable_hw(drvdata);
 154
 155         pm_runtime_put(&adev->dev);
 156
 157         desc.type = CORESIGHT_DEV_TYPE_SINK;
 158         desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_PORT;
 159         desc.ops = &tpiu_cs_ops;
 160         desc.pdata = pdata;
 161         desc.dev = dev;
 162         drvdata->csdev = coresight_register(&desc);
 163         if (IS_ERR(drvdata->csdev))
 164                 return PTR_ERR(drvdata->csdev);
 165
 166         return 0;
 167 }
 168
 169 #ifdef CONFIG_PM
 170 static int tpiu_runtime_suspend(struct device *dev)
 171 {
 172         struct tpiu_drvdata *drvdata = dev_get_drvdata(dev);
 173
 174         if (drvdata && !IS_ERR(drvdata->atclk))
 175                 clk_disable_unprepare(drvdata->atclk);
 176
 177         return 0;
 178 }
 179
 180 static int tpiu_runtime_resume(struct device *dev)
 181 {
 182         struct tpiu_drvdata *drvdata = dev_get_drvdata(dev);
 183
 184         if (drvdata && !IS_ERR(drvdata->atclk))
 185                 clk_prepare_enable(drvdata->atclk);
 186
 187         return 0;
 188 }
 189 #endif
 190
 191 static const struct dev_pm_ops tpiu_dev_pm_ops = {
 192         SET_RUNTIME_PM_OPS(tpiu_runtime_suspend, tpiu_runtime_resume, NULL)
 193 };
 194
 195 static struct amba_id tpiu_ids[] = {
 196         {
 197                 .id     = 0x0003b912,
 198                 .mask   = 0x0003ffff,
 199         },
 200         {
 201                 .id     = 0x0004b912,
 202                 .mask   = 0x0007ffff,
 203         },
 204         { 0, 0},
 205 };
 206
 207 static struct amba_driver tpiu_driver = {
 208         .drv = {
 209                 .name   = "coresight-tpiu",
 210                 .owner  = THIS_MODULE,
 211                 .pm     = &tpiu_dev_pm_ops,
 212                 .suppress_bind_attrs = true,
 213         },
 214         .probe          = tpiu_probe,
 215         .id_table       = tpiu_ids,
 216 };
 217 builtin_amba_driver(tpiu_driver);