drivers/crypto/ccree/cc_debugfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (C) 2012-2018 ARM Limited or its affiliates. */
   3
   4 #include <linux/kernel.h>
   5 #include <linux/debugfs.h>
   6 #include <linux/stringify.h>
   7 #include "cc_driver.h"
   8 #include "cc_crypto_ctx.h"
   9 #include "cc_debugfs.h"
  10
  11 struct cc_debugfs_ctx {
  12         struct dentry *dir;
  13 };
  14
  15 #define CC_DEBUG_REG(_X) {      \
  16         .name = __stringify(_X),\
  17         .offset = CC_REG(_X)    \
  18         }
  19
  20 /*
  21  * This is a global var for the dentry of the
  22  * debugfs ccree/ dir. It is not tied down to
  23  * a specific instance of ccree, hence it is
  24  * global.
  25  */
  26 static struct dentry *cc_debugfs_dir;
  27
  28 static struct debugfs_reg32 debug_regs[] = {
  29         CC_DEBUG_REG(HOST_SIGNATURE),
  30         CC_DEBUG_REG(HOST_IRR),
  31         CC_DEBUG_REG(HOST_POWER_DOWN_EN),
  32         CC_DEBUG_REG(AXIM_MON_ERR),
  33         CC_DEBUG_REG(DSCRPTR_QUEUE_CONTENT),
  34         CC_DEBUG_REG(HOST_IMR),
  35         CC_DEBUG_REG(AXIM_CFG),
  36         CC_DEBUG_REG(AXIM_CACHE_PARAMS),
  37         CC_DEBUG_REG(HOST_VERSION),
  38         CC_DEBUG_REG(GPR_HOST),
  39         CC_DEBUG_REG(AXIM_MON_COMP),
  40 };
  41
  42 int __init cc_debugfs_global_init(void)
  43 {
  44         cc_debugfs_dir = debugfs_create_dir("ccree", NULL);
  45
  46         return !cc_debugfs_dir;
  47 }
  48
  49 void __exit cc_debugfs_global_fini(void)
  50 {
  51         debugfs_remove(cc_debugfs_dir);
  52 }
  53
  54 int cc_debugfs_init(struct cc_drvdata *drvdata)
  55 {
  56         struct device *dev = drvdata_to_dev(drvdata);
  57         struct cc_debugfs_ctx *ctx;
  58         struct debugfs_regset32 *regset;
  59         struct dentry *file;
  60
  61         ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
  62         if (!ctx)
  63                 return -ENOMEM;
  64
  65         regset = devm_kzalloc(dev, sizeof(*regset), GFP_KERNEL);
  66         if (!regset)
  67                 return -ENOMEM;
  68
  69         regset->regs = debug_regs;
  70         regset->nregs = ARRAY_SIZE(debug_regs);
  71         regset->base = drvdata->cc_base;
  72
  73         ctx->dir = debugfs_create_dir(drvdata->plat_dev->name, cc_debugfs_dir);
  74         if (!ctx->dir)
  75                 return -ENFILE;
  76
  77         file = debugfs_create_regset32("regs", 0400, ctx->dir, regset);
  78         if (!file) {
  79                 debugfs_remove(ctx->dir);
  80                 return -ENFILE;
  81         }
  82
  83         file = debugfs_create_bool("coherent", 0400, ctx->dir,
  84                                    &drvdata->coherent);
  85
  86         if (!file) {
  87                 debugfs_remove_recursive(ctx->dir);
  88                 return -ENFILE;
  89         }
  90
  91         drvdata->debugfs = ctx;
  92
  93         return 0;
  94 }
  95
  96 void cc_debugfs_fini(struct cc_drvdata *drvdata)
  97 {
  98         struct cc_debugfs_ctx *ctx = (struct cc_debugfs_ctx *)drvdata->debugfs;
  99
 100         debugfs_remove_recursive(ctx->dir);
 101 }