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         { .name = "SIGNATURE" }, /* Must be 0th */
  30         { .name = "VERSION" }, /* Must be 1st */
  31         CC_DEBUG_REG(HOST_IRR),
  32         CC_DEBUG_REG(HOST_POWER_DOWN_EN),
  33         CC_DEBUG_REG(AXIM_MON_ERR),
  34         CC_DEBUG_REG(DSCRPTR_QUEUE_CONTENT),
  35         CC_DEBUG_REG(HOST_IMR),
  36         CC_DEBUG_REG(AXIM_CFG),
  37         CC_DEBUG_REG(AXIM_CACHE_PARAMS),
  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         debug_regs[0].offset = drvdata->sig_offset;
  62         debug_regs[1].offset = drvdata->ver_offset;
  63
  64         ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
  65         if (!ctx)
  66                 return -ENOMEM;
  67
  68         regset = devm_kzalloc(dev, sizeof(*regset), GFP_KERNEL);
  69         if (!regset)
  70                 return -ENOMEM;
  71
  72         regset->regs = debug_regs;
  73         regset->nregs = ARRAY_SIZE(debug_regs);
  74         regset->base = drvdata->cc_base;
  75
  76         ctx->dir = debugfs_create_dir(drvdata->plat_dev->name, cc_debugfs_dir);
  77         if (!ctx->dir)
  78                 return -ENFILE;
  79
  80         file = debugfs_create_regset32("regs", 0400, ctx->dir, regset);
  81         if (!file) {
  82                 debugfs_remove(ctx->dir);
  83                 return -ENFILE;
  84         }
  85
  86         file = debugfs_create_bool("coherent", 0400, ctx->dir,
  87                                    &drvdata->coherent);
  88
  89         if (!file) {
  90                 debugfs_remove_recursive(ctx->dir);
  91                 return -ENFILE;
  92         }
  93
  94         drvdata->debugfs = ctx;
  95
  96         return 0;
  97 }
  98
  99 void cc_debugfs_fini(struct cc_drvdata *drvdata)
 100 {
 101         struct cc_debugfs_ctx *ctx = (struct cc_debugfs_ctx *)drvdata->debugfs;
 102
 103         debugfs_remove_recursive(ctx->dir);
 104 }