1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Qualcomm ICE (Inline Crypto Engine) support.
4 *
5 * Copyright (c) 2014-2019, The Linux Foundation. All rights reserved.
6 * Copyright 2019 Google LLC
7 */
8
9 #include <linux/delay.h>
10 #include <linux/platform_device.h>
11 #include <linux/qcom_scm.h>
12
13 #include "ufs-qcom.h"
14
15 #define AES_256_XTS_KEY_SIZE 64
16
17 /* QCOM ICE registers */
18
19 #define QCOM_ICE_REG_CONTROL 0x0000
20 #define QCOM_ICE_REG_RESET 0x0004
21 #define QCOM_ICE_REG_VERSION 0x0008
22 #define QCOM_ICE_REG_FUSE_SETTING 0x0010
23 #define QCOM_ICE_REG_PARAMETERS_1 0x0014
24 #define QCOM_ICE_REG_PARAMETERS_2 0x0018
25 #define QCOM_ICE_REG_PARAMETERS_3 0x001C
26 #define QCOM_ICE_REG_PARAMETERS_4 0x0020
27 #define QCOM_ICE_REG_PARAMETERS_5 0x0024
28
29 /* QCOM ICE v3.X only */
30 #define QCOM_ICE_GENERAL_ERR_STTS 0x0040
31 #define QCOM_ICE_INVALID_CCFG_ERR_STTS 0x0030
32 #define QCOM_ICE_GENERAL_ERR_MASK 0x0044
33
34 /* QCOM ICE v2.X only */
35 #define QCOM_ICE_REG_NON_SEC_IRQ_STTS 0x0040
36 #define QCOM_ICE_REG_NON_SEC_IRQ_MASK 0x0044
37
38 #define QCOM_ICE_REG_NON_SEC_IRQ_CLR 0x0048
39 #define QCOM_ICE_REG_STREAM1_ERROR_SYNDROME1 0x0050
40 #define QCOM_ICE_REG_STREAM1_ERROR_SYNDROME2 0x0054
41 #define QCOM_ICE_REG_STREAM2_ERROR_SYNDROME1 0x0058
42 #define QCOM_ICE_REG_STREAM2_ERROR_SYNDROME2 0x005C
43 #define QCOM_ICE_REG_STREAM1_BIST_ERROR_VEC 0x0060
44 #define QCOM_ICE_REG_STREAM2_BIST_ERROR_VEC 0x0064
45 #define QCOM_ICE_REG_STREAM1_BIST_FINISH_VEC 0x0068
46 #define QCOM_ICE_REG_STREAM2_BIST_FINISH_VEC 0x006C
47 #define QCOM_ICE_REG_BIST_STATUS 0x0070
48 #define QCOM_ICE_REG_BYPASS_STATUS 0x0074
49 #define QCOM_ICE_REG_ADVANCED_CONTROL 0x1000
50 #define QCOM_ICE_REG_ENDIAN_SWAP 0x1004
51 #define QCOM_ICE_REG_TEST_BUS_CONTROL 0x1010
52 #define QCOM_ICE_REG_TEST_BUS_REG 0x1014
53
54 /* BIST ("built-in self-test"?) status flags */
55 #define QCOM_ICE_BIST_STATUS_MASK 0xF0000000
56
57 #define QCOM_ICE_FUSE_SETTING_MASK 0x1
58 #define QCOM_ICE_FORCE_HW_KEY0_SETTING_MASK 0x2
59 #define QCOM_ICE_FORCE_HW_KEY1_SETTING_MASK 0x4
60
61 #define qcom_ice_writel(host, val, reg) \
62 writel((val), (host)->ice_mmio + (reg))
63 #define qcom_ice_readl(host, reg) \
64 readl((host)->ice_mmio + (reg))
65
qcom_ice_supported(struct ufs_qcom_host * host)66 static bool qcom_ice_supported(struct ufs_qcom_host *host)
67 {
68 struct device *dev = host->hba->dev;
69 u32 regval = qcom_ice_readl(host, QCOM_ICE_REG_VERSION);
70 int major = regval >> 24;
71 int minor = (regval >> 16) & 0xFF;
72 int step = regval & 0xFFFF;
73
74 /* For now this driver only supports ICE version 3. */
75 if (major != 3) {
76 dev_warn(dev, "Unsupported ICE version: v%d.%d.%d\n",
77 major, minor, step);
78 return false;
79 }
80
81 dev_info(dev, "Found QC Inline Crypto Engine (ICE) v%d.%d.%d\n",
82 major, minor, step);
83
84 /* If fuses are blown, ICE might not work in the standard way. */
85 regval = qcom_ice_readl(host, QCOM_ICE_REG_FUSE_SETTING);
86 if (regval & (QCOM_ICE_FUSE_SETTING_MASK |
87 QCOM_ICE_FORCE_HW_KEY0_SETTING_MASK |
88 QCOM_ICE_FORCE_HW_KEY1_SETTING_MASK)) {
89 dev_warn(dev, "Fuses are blown; ICE is unusable!\n");
90 return false;
91 }
92 return true;
93 }
94
ufs_qcom_ice_init(struct ufs_qcom_host * host)95 int ufs_qcom_ice_init(struct ufs_qcom_host *host)
96 {
97 struct ufs_hba *hba = host->hba;
98 struct device *dev = hba->dev;
99 struct platform_device *pdev = to_platform_device(dev);
100 struct resource *res;
101 int err;
102
103 if (!(ufshcd_readl(hba, REG_CONTROLLER_CAPABILITIES) &
104 MASK_CRYPTO_SUPPORT))
105 return 0;
106
107 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ice");
108 if (!res) {
109 dev_warn(dev, "ICE registers not found\n");
110 goto disable;
111 }
112
113 if (!qcom_scm_ice_available()) {
114 dev_warn(dev, "ICE SCM interface not found\n");
115 goto disable;
116 }
117
118 host->ice_mmio = devm_ioremap_resource(dev, res);
119 if (IS_ERR(host->ice_mmio)) {
120 err = PTR_ERR(host->ice_mmio);
121 return err;
122 }
123
124 if (!qcom_ice_supported(host))
125 goto disable;
126
127 return 0;
128
129 disable:
130 dev_warn(dev, "Disabling inline encryption support\n");
131 hba->caps &= ~UFSHCD_CAP_CRYPTO;
132 return 0;
133 }
134
qcom_ice_low_power_mode_enable(struct ufs_qcom_host * host)135 static void qcom_ice_low_power_mode_enable(struct ufs_qcom_host *host)
136 {
137 u32 regval;
138
139 regval = qcom_ice_readl(host, QCOM_ICE_REG_ADVANCED_CONTROL);
140 /*
141 * Enable low power mode sequence
142 * [0]-0, [1]-0, [2]-0, [3]-E, [4]-0, [5]-0, [6]-0, [7]-0
143 */
144 regval |= 0x7000;
145 qcom_ice_writel(host, regval, QCOM_ICE_REG_ADVANCED_CONTROL);
146 }
147
qcom_ice_optimization_enable(struct ufs_qcom_host * host)148 static void qcom_ice_optimization_enable(struct ufs_qcom_host *host)
149 {
150 u32 regval;
151
152 /* ICE Optimizations Enable Sequence */
153 regval = qcom_ice_readl(host, QCOM_ICE_REG_ADVANCED_CONTROL);
154 regval |= 0xD807100;
155 /* ICE HPG requires delay before writing */
156 udelay(5);
157 qcom_ice_writel(host, regval, QCOM_ICE_REG_ADVANCED_CONTROL);
158 udelay(5);
159 }
160
ufs_qcom_ice_enable(struct ufs_qcom_host * host)161 int ufs_qcom_ice_enable(struct ufs_qcom_host *host)
162 {
163 if (!(host->hba->caps & UFSHCD_CAP_CRYPTO))
164 return 0;
165 qcom_ice_low_power_mode_enable(host);
166 qcom_ice_optimization_enable(host);
167 return ufs_qcom_ice_resume(host);
168 }
169
170 /* Poll until all BIST bits are reset */
qcom_ice_wait_bist_status(struct ufs_qcom_host * host)171 static int qcom_ice_wait_bist_status(struct ufs_qcom_host *host)
172 {
173 int count;
174 u32 reg;
175
176 for (count = 0; count < 100; count++) {
177 reg = qcom_ice_readl(host, QCOM_ICE_REG_BIST_STATUS);
178 if (!(reg & QCOM_ICE_BIST_STATUS_MASK))
179 break;
180 udelay(50);
181 }
182 if (reg)
183 return -ETIMEDOUT;
184 return 0;
185 }
186
ufs_qcom_ice_resume(struct ufs_qcom_host * host)187 int ufs_qcom_ice_resume(struct ufs_qcom_host *host)
188 {
189 int err;
190
191 if (!(host->hba->caps & UFSHCD_CAP_CRYPTO))
192 return 0;
193
194 err = qcom_ice_wait_bist_status(host);
195 if (err) {
196 dev_err(host->hba->dev, "BIST status error (%d)\n", err);
197 return err;
198 }
199 return 0;
200 }
201
202 /*
203 * Program a key into a QC ICE keyslot, or evict a keyslot. QC ICE requires
204 * vendor-specific SCM calls for this; it doesn't support the standard way.
205 */
ufs_qcom_ice_program_key(struct ufs_hba * hba,const union ufs_crypto_cfg_entry * cfg,int slot)206 int ufs_qcom_ice_program_key(struct ufs_hba *hba,
207 const union ufs_crypto_cfg_entry *cfg, int slot)
208 {
209 union ufs_crypto_cap_entry cap;
210 union {
211 u8 bytes[AES_256_XTS_KEY_SIZE];
212 u32 words[AES_256_XTS_KEY_SIZE / sizeof(u32)];
213 } key;
214 int i;
215 int err;
216
217 if (!(cfg->config_enable & UFS_CRYPTO_CONFIGURATION_ENABLE))
218 return qcom_scm_ice_invalidate_key(slot);
219
220 /* Only AES-256-XTS has been tested so far. */
221 cap = hba->crypto_cap_array[cfg->crypto_cap_idx];
222 if (cap.algorithm_id != UFS_CRYPTO_ALG_AES_XTS ||
223 cap.key_size != UFS_CRYPTO_KEY_SIZE_256) {
224 dev_err_ratelimited(hba->dev,
225 "Unhandled crypto capability; algorithm_id=%d, key_size=%d\n",
226 cap.algorithm_id, cap.key_size);
227 return -EINVAL;
228 }
229
230 memcpy(key.bytes, cfg->crypto_key, AES_256_XTS_KEY_SIZE);
231
232 /*
233 * The SCM call byte-swaps the 32-bit words of the key. So we have to
234 * do the same, in order for the final key be correct.
235 */
236 for (i = 0; i < ARRAY_SIZE(key.words); i++)
237 __cpu_to_be32s(&key.words[i]);
238
239 err = qcom_scm_ice_set_key(slot, key.bytes, AES_256_XTS_KEY_SIZE,
240 QCOM_SCM_ICE_CIPHER_AES_256_XTS,
241 cfg->data_unit_size);
242 memzero_explicit(&key, sizeof(key));
243 return err;
244 }
245
