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 #define CC_DEBUG_REG(_X) {	\
12 	.name = __stringify(_X),\
13 	.offset = CC_REG(_X)	\
14 	}
15 
16 /*
17  * This is a global var for the dentry of the
18  * debugfs ccree/ dir. It is not tied down to
19  * a specific instance of ccree, hence it is
20  * global.
21  */
22 static struct dentry *cc_debugfs_dir;
23 
24 static struct debugfs_reg32 ver_sig_regs[] = {
25 	{ .name = "SIGNATURE" }, /* Must be 0th */
26 	{ .name = "VERSION" }, /* Must be 1st */
27 };
28 
29 static const struct debugfs_reg32 pid_cid_regs[] = {
30 	CC_DEBUG_REG(PERIPHERAL_ID_0),
31 	CC_DEBUG_REG(PERIPHERAL_ID_1),
32 	CC_DEBUG_REG(PERIPHERAL_ID_2),
33 	CC_DEBUG_REG(PERIPHERAL_ID_3),
34 	CC_DEBUG_REG(PERIPHERAL_ID_4),
35 	CC_DEBUG_REG(COMPONENT_ID_0),
36 	CC_DEBUG_REG(COMPONENT_ID_1),
37 	CC_DEBUG_REG(COMPONENT_ID_2),
38 	CC_DEBUG_REG(COMPONENT_ID_3),
39 };
40 
41 static const struct debugfs_reg32 debug_regs[] = {
42 	CC_DEBUG_REG(HOST_IRR),
43 	CC_DEBUG_REG(HOST_POWER_DOWN_EN),
44 	CC_DEBUG_REG(AXIM_MON_ERR),
45 	CC_DEBUG_REG(DSCRPTR_QUEUE_CONTENT),
46 	CC_DEBUG_REG(HOST_IMR),
47 	CC_DEBUG_REG(AXIM_CFG),
48 	CC_DEBUG_REG(AXIM_CACHE_PARAMS),
49 	CC_DEBUG_REG(GPR_HOST),
50 	CC_DEBUG_REG(AXIM_MON_COMP),
51 };
52 
cc_debugfs_global_init(void)53 void __init cc_debugfs_global_init(void)
54 {
55 	cc_debugfs_dir = debugfs_create_dir("ccree", NULL);
56 }
57 
cc_debugfs_global_fini(void)58 void cc_debugfs_global_fini(void)
59 {
60 	debugfs_remove(cc_debugfs_dir);
61 }
62 
cc_debugfs_init(struct cc_drvdata * drvdata)63 int cc_debugfs_init(struct cc_drvdata *drvdata)
64 {
65 	struct device *dev = drvdata_to_dev(drvdata);
66 	struct debugfs_regset32 *regset, *verset;
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 	regset->dev = dev;
76 
77 	drvdata->dir = debugfs_create_dir(drvdata->plat_dev->name,
78 					  cc_debugfs_dir);
79 
80 	debugfs_create_regset32("regs", 0400, drvdata->dir, regset);
81 	debugfs_create_bool("coherent", 0400, drvdata->dir, &drvdata->coherent);
82 
83 	verset = devm_kzalloc(dev, sizeof(*verset), GFP_KERNEL);
84 	/* Failing here is not important enough to fail the module load */
85 	if (!verset)
86 		return 0;
87 
88 	if (drvdata->hw_rev <= CC_HW_REV_712) {
89 		ver_sig_regs[0].offset = drvdata->sig_offset;
90 		ver_sig_regs[1].offset = drvdata->ver_offset;
91 		verset->regs = ver_sig_regs;
92 		verset->nregs = ARRAY_SIZE(ver_sig_regs);
93 	} else {
94 		verset->regs = pid_cid_regs;
95 		verset->nregs = ARRAY_SIZE(pid_cid_regs);
96 	}
97 	verset->base = drvdata->cc_base;
98 	verset->dev = dev;
99 
100 	debugfs_create_regset32("version", 0400, drvdata->dir, verset);
101 	return 0;
102 }
103 
cc_debugfs_fini(struct cc_drvdata * drvdata)104 void cc_debugfs_fini(struct cc_drvdata *drvdata)
105 {
106 	debugfs_remove_recursive(drvdata->dir);
107 }
108