drivers/crypto/ccree/cc_debugfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (C) 2012-2019 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 ver_sig_regs[] = {
  29         { .name = "SIGNATURE" }, /* Must be 0th */
  30         { .name = "VERSION" }, /* Must be 1st */
  31 };
  32
  33 static struct debugfs_reg32 pid_cid_regs[] = {
  34         CC_DEBUG_REG(PERIPHERAL_ID_0),
  35         CC_DEBUG_REG(PERIPHERAL_ID_1),
  36         CC_DEBUG_REG(PERIPHERAL_ID_2),
  37         CC_DEBUG_REG(PERIPHERAL_ID_3),
  38         CC_DEBUG_REG(PERIPHERAL_ID_4),
  39         CC_DEBUG_REG(COMPONENT_ID_0),
  40         CC_DEBUG_REG(COMPONENT_ID_1),
  41         CC_DEBUG_REG(COMPONENT_ID_2),
  42         CC_DEBUG_REG(COMPONENT_ID_3),
  43 };
  44
  45 static struct debugfs_reg32 debug_regs[] = {
  46         CC_DEBUG_REG(HOST_IRR),
  47         CC_DEBUG_REG(HOST_POWER_DOWN_EN),
  48         CC_DEBUG_REG(AXIM_MON_ERR),
  49         CC_DEBUG_REG(DSCRPTR_QUEUE_CONTENT),
  50         CC_DEBUG_REG(HOST_IMR),
  51         CC_DEBUG_REG(AXIM_CFG),
  52         CC_DEBUG_REG(AXIM_CACHE_PARAMS),
  53         CC_DEBUG_REG(GPR_HOST),
  54         CC_DEBUG_REG(AXIM_MON_COMP),
  55 };
  56
  57 void __init cc_debugfs_global_init(void)
  58 {
  59         cc_debugfs_dir = debugfs_create_dir("ccree", NULL);
  60 }
  61
  62 void __exit cc_debugfs_global_fini(void)
  63 {
  64         debugfs_remove(cc_debugfs_dir);
  65 }
  66
  67 int cc_debugfs_init(struct cc_drvdata *drvdata)
  68 {
  69         struct device *dev = drvdata_to_dev(drvdata);
  70         struct cc_debugfs_ctx *ctx;
  71         struct debugfs_regset32 *regset, *verset;
  72
  73         ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
  74         if (!ctx)
  75                 return -ENOMEM;
  76
  77         regset = devm_kzalloc(dev, sizeof(*regset), GFP_KERNEL);
  78         if (!regset)
  79                 return -ENOMEM;
  80
  81         regset->regs = debug_regs;
  82         regset->nregs = ARRAY_SIZE(debug_regs);
  83         regset->base = drvdata->cc_base;
  84
  85         ctx->dir = debugfs_create_dir(drvdata->plat_dev->name, cc_debugfs_dir);
  86
  87         debugfs_create_regset32("regs", 0400, ctx->dir, regset);
  88         debugfs_create_bool("coherent", 0400, ctx->dir, &drvdata->coherent);
  89
  90         verset = devm_kzalloc(dev, sizeof(*verset), GFP_KERNEL);
  91         /* Failing here is not important enough to fail the module load */
  92         if (!verset)
  93                 goto out;
  94
  95         if (drvdata->hw_rev <= CC_HW_REV_712) {
  96                 ver_sig_regs[0].offset = drvdata->sig_offset;
  97                 ver_sig_regs[1].offset = drvdata->ver_offset;
  98                 verset->regs = ver_sig_regs;
  99                 verset->nregs = ARRAY_SIZE(ver_sig_regs);
 100         } else {
 101                 verset->regs = pid_cid_regs;
 102                 verset->nregs = ARRAY_SIZE(pid_cid_regs);
 103         }
 104         verset->base = drvdata->cc_base;
 105
 106         debugfs_create_regset32("version", 0400, ctx->dir, verset);
 107
 108 out:
 109         drvdata->debugfs = ctx;
 110         return 0;
 111 }
 112
 113 void cc_debugfs_fini(struct cc_drvdata *drvdata)
 114 {
 115         struct cc_debugfs_ctx *ctx = (struct cc_debugfs_ctx *)drvdata->debugfs;
 116
 117         debugfs_remove_recursive(ctx->dir);
 118 }