drivers/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/clk.h>
  21 #include <linux/coresight.h>
  22 #include <linux/amba/bus.h>
  23
  24 #include "coresight-priv.h"
  25
  26 #define TPIU_SUPP_PORTSZ        0x000
  27 #define TPIU_CURR_PORTSZ        0x004
  28 #define TPIU_SUPP_TRIGMODES     0x100
  29 #define TPIU_TRIG_CNTRVAL       0x104
  30 #define TPIU_TRIG_MULT          0x108
  31 #define TPIU_SUPP_TESTPATM      0x200
  32 #define TPIU_CURR_TESTPATM      0x204
  33 #define TPIU_TEST_PATREPCNTR    0x208
  34 #define TPIU_FFSR               0x300
  35 #define TPIU_FFCR               0x304
  36 #define TPIU_FSYNC_CNTR         0x308
  37 #define TPIU_EXTCTL_INPORT      0x400
  38 #define TPIU_EXTCTL_OUTPORT     0x404
  39 #define TPIU_ITTRFLINACK        0xee4
  40 #define TPIU_ITTRFLIN           0xee8
  41 #define TPIU_ITATBDATA0         0xeec
  42 #define TPIU_ITATBCTR2          0xef0
  43 #define TPIU_ITATBCTR1          0xef4
  44 #define TPIU_ITATBCTR0          0xef8
  45
  46 /** register definition **/
  47 /* FFCR - 0x304 */
  48 #define FFCR_FON_MAN            BIT(6)
  49
  50 /**
  51  * @base:       memory mapped base address for this component.
  52  * @dev:        the device entity associated to this component.
  53  * @csdev:      component vitals needed by the framework.
  54  * @clk:        the clock this component is associated to.
  55  */
  56 struct tpiu_drvdata {
  57         void __iomem            *base;
  58         struct device           *dev;
  59         struct coresight_device *csdev;
  60         struct clk              *clk;
  61 };
  62
  63 static void tpiu_enable_hw(struct tpiu_drvdata *drvdata)
  64 {
  65         CS_UNLOCK(drvdata->base);
  66
  67         /* TODO: fill this up */
  68
  69         CS_LOCK(drvdata->base);
  70 }
  71
  72 static int tpiu_enable(struct coresight_device *csdev)
  73 {
  74         struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
  75         int ret;
  76
  77         ret = clk_prepare_enable(drvdata->clk);
  78         if (ret)
  79                 return ret;
  80
  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 controle reg. */
  92         writel_relaxed(0x0, drvdata->base + TPIU_FFCR);
  93         /* Generate manual flush */
  94         writel_relaxed(FFCR_FON_MAN, drvdata->base + TPIU_FFCR);
  95
  96         CS_LOCK(drvdata->base);
  97 }
  98
  99 static void tpiu_disable(struct coresight_device *csdev)
 100 {
 101         struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
 102
 103         tpiu_disable_hw(drvdata);
 104
 105         clk_disable_unprepare(drvdata->clk);
 106
 107         dev_info(drvdata->dev, "TPIU disabled\n");
 108 }
 109
 110 static const struct coresight_ops_sink tpiu_sink_ops = {
 111         .enable         = tpiu_enable,
 112         .disable        = tpiu_disable,
 113 };
 114
 115 static const struct coresight_ops tpiu_cs_ops = {
 116         .sink_ops       = &tpiu_sink_ops,
 117 };
 118
 119 static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
 120 {
 121         int ret;
 122         void __iomem *base;
 123         struct device *dev = &adev->dev;
 124         struct coresight_platform_data *pdata = NULL;
 125         struct tpiu_drvdata *drvdata;
 126         struct resource *res = &adev->res;
 127         struct coresight_desc *desc;
 128         struct device_node *np = adev->dev.of_node;
 129
 130         if (np) {
 131                 pdata = of_get_coresight_platform_data(dev, np);
 132                 if (IS_ERR(pdata))
 133                         return PTR_ERR(pdata);
 134                 adev->dev.platform_data = pdata;
 135         }
 136
 137         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 138         if (!drvdata)
 139                 return -ENOMEM;
 140
 141         drvdata->dev = &adev->dev;
 142         dev_set_drvdata(dev, drvdata);
 143
 144         /* Validity for the resource is already checked by the AMBA core */
 145         base = devm_ioremap_resource(dev, res);
 146         if (IS_ERR(base))
 147                 return PTR_ERR(base);
 148
 149         drvdata->base = base;
 150
 151         drvdata->clk = adev->pclk;
 152         ret = clk_prepare_enable(drvdata->clk);
 153         if (ret)
 154                 return ret;
 155
 156         /* Disable tpiu to support older devices */
 157         tpiu_disable_hw(drvdata);
 158
 159         clk_disable_unprepare(drvdata->clk);
 160
 161         desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
 162         if (!desc)
 163                 return -ENOMEM;
 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         dev_info(dev, "TPIU initialized\n");
 175         return 0;
 176 }
 177
 178 static int tpiu_remove(struct amba_device *adev)
 179 {
 180         struct tpiu_drvdata *drvdata = amba_get_drvdata(adev);
 181
 182         coresight_unregister(drvdata->csdev);
 183         return 0;
 184 }
 185
 186 static struct amba_id tpiu_ids[] = {
 187         {
 188                 .id     = 0x0003b912,
 189                 .mask   = 0x0003ffff,
 190         },
 191         { 0, 0},
 192 };
 193
 194 static struct amba_driver tpiu_driver = {
 195         .drv = {
 196                 .name   = "coresight-tpiu",
 197                 .owner  = THIS_MODULE,
 198         },
 199         .probe          = tpiu_probe,
 200         .remove         = tpiu_remove,
 201         .id_table       = tpiu_ids,
 202 };
 203
 204 static int __init tpiu_init(void)
 205 {
 206         return amba_driver_register(&tpiu_driver);
 207 }
 208 module_init(tpiu_init);
 209
 210 static void __exit tpiu_exit(void)
 211 {
 212         amba_driver_unregister(&tpiu_driver);
 213 }
 214 module_exit(tpiu_exit);
 215
 216 MODULE_LICENSE("GPL v2");
 217 MODULE_DESCRIPTION("CoreSight Trace Port Interface Unit driver");