include/drm/drm_hdcp.h

   1 /* SPDX-License-Identifier: MIT */
   2 /*
   3  * Copyright (C) 2017 Google, Inc.
   4  *
   5  * Authors:
   6  * Sean Paul <seanpaul@chromium.org>
   7  */
   8
   9 #ifndef _DRM_HDCP_H_INCLUDED_
  10 #define _DRM_HDCP_H_INCLUDED_
  11
  12 #include <linux/types.h>
  13
  14 /* Period of hdcp checks (to ensure we're still authenticated) */
  15 #define DRM_HDCP_CHECK_PERIOD_MS                (128 * 16)
  16 #define DRM_HDCP2_CHECK_PERIOD_MS               500
  17
  18 /* Shared lengths/masks between HDMI/DVI/DisplayPort */
  19 #define DRM_HDCP_AN_LEN                         8
  20 #define DRM_HDCP_BSTATUS_LEN                    2
  21 #define DRM_HDCP_KSV_LEN                        5
  22 #define DRM_HDCP_RI_LEN                         2
  23 #define DRM_HDCP_V_PRIME_PART_LEN               4
  24 #define DRM_HDCP_V_PRIME_NUM_PARTS              5
  25 #define DRM_HDCP_NUM_DOWNSTREAM(x)              (x & 0x7f)
  26 #define DRM_HDCP_MAX_CASCADE_EXCEEDED(x)        (x & BIT(3))
  27 #define DRM_HDCP_MAX_DEVICE_EXCEEDED(x)         (x & BIT(7))
  28
  29 /* Slave address for the HDCP registers in the receiver */
  30 #define DRM_HDCP_DDC_ADDR                       0x3A
  31
  32 /* Value to use at the end of the SHA-1 bytestream used for repeaters */
  33 #define DRM_HDCP_SHA1_TERMINATOR                0x80
  34
  35 /* HDCP register offsets for HDMI/DVI devices */
  36 #define DRM_HDCP_DDC_BKSV                       0x00
  37 #define DRM_HDCP_DDC_RI_PRIME                   0x08
  38 #define DRM_HDCP_DDC_AKSV                       0x10
  39 #define DRM_HDCP_DDC_AN                         0x18
  40 #define DRM_HDCP_DDC_V_PRIME(h)                 (0x20 + h * 4)
  41 #define DRM_HDCP_DDC_BCAPS                      0x40
  42 #define  DRM_HDCP_DDC_BCAPS_REPEATER_PRESENT    BIT(6)
  43 #define  DRM_HDCP_DDC_BCAPS_KSV_FIFO_READY      BIT(5)
  44 #define DRM_HDCP_DDC_BSTATUS                    0x41
  45 #define DRM_HDCP_DDC_KSV_FIFO                   0x43
  46
  47 #define DRM_HDCP_1_4_SRM_ID                     0x8
  48 #define DRM_HDCP_1_4_VRL_LENGTH_SIZE            3
  49 #define DRM_HDCP_1_4_DCP_SIG_SIZE               40
  50
  51 /* Protocol message definition for HDCP2.2 specification */
  52 /*
  53  * Protected content streams are classified into 2 types:
  54  * - Type0: Can be transmitted with HDCP 1.4+
  55  * - Type1: Can be transmitted with HDCP 2.2+
  56  */
  57 #define HDCP_STREAM_TYPE0                       0x00
  58 #define HDCP_STREAM_TYPE1                       0x01
  59
  60 /* HDCP2.2 Msg IDs */
  61 #define HDCP_2_2_NULL_MSG                       1
  62 #define HDCP_2_2_AKE_INIT                       2
  63 #define HDCP_2_2_AKE_SEND_CERT                  3
  64 #define HDCP_2_2_AKE_NO_STORED_KM               4
  65 #define HDCP_2_2_AKE_STORED_KM                  5
  66 #define HDCP_2_2_AKE_SEND_HPRIME                7
  67 #define HDCP_2_2_AKE_SEND_PAIRING_INFO          8
  68 #define HDCP_2_2_LC_INIT                        9
  69 #define HDCP_2_2_LC_SEND_LPRIME                 10
  70 #define HDCP_2_2_SKE_SEND_EKS                   11
  71 #define HDCP_2_2_REP_SEND_RECVID_LIST           12
  72 #define HDCP_2_2_REP_SEND_ACK                   15
  73 #define HDCP_2_2_REP_STREAM_MANAGE              16
  74 #define HDCP_2_2_REP_STREAM_READY               17
  75
  76 #define HDCP_2_2_RTX_LEN                        8
  77 #define HDCP_2_2_RRX_LEN                        8
  78
  79 #define HDCP_2_2_K_PUB_RX_MOD_N_LEN             128
  80 #define HDCP_2_2_K_PUB_RX_EXP_E_LEN             3
  81 #define HDCP_2_2_K_PUB_RX_LEN                   (HDCP_2_2_K_PUB_RX_MOD_N_LEN + \
  82                                                  HDCP_2_2_K_PUB_RX_EXP_E_LEN)
  83
  84 #define HDCP_2_2_DCP_LLC_SIG_LEN                384
  85
  86 #define HDCP_2_2_E_KPUB_KM_LEN                  128
  87 #define HDCP_2_2_E_KH_KM_M_LEN                  (16 + 16)
  88 #define HDCP_2_2_H_PRIME_LEN                    32
  89 #define HDCP_2_2_E_KH_KM_LEN                    16
  90 #define HDCP_2_2_RN_LEN                         8
  91 #define HDCP_2_2_L_PRIME_LEN                    32
  92 #define HDCP_2_2_E_DKEY_KS_LEN                  16
  93 #define HDCP_2_2_RIV_LEN                        8
  94 #define HDCP_2_2_SEQ_NUM_LEN                    3
  95 #define HDCP_2_2_V_PRIME_HALF_LEN               (HDCP_2_2_L_PRIME_LEN / 2)
  96 #define HDCP_2_2_RECEIVER_ID_LEN                DRM_HDCP_KSV_LEN
  97 #define HDCP_2_2_MAX_DEVICE_COUNT               31
  98 #define HDCP_2_2_RECEIVER_IDS_MAX_LEN           (HDCP_2_2_RECEIVER_ID_LEN * \
  99                                                  HDCP_2_2_MAX_DEVICE_COUNT)
 100 #define HDCP_2_2_MPRIME_LEN                     32
 101
 102 /* Following Macros take a byte at a time for bit(s) masking */
 103 /*
 104  * TODO: This has to be changed for DP MST, as multiple stream on
 105  * same port is possible.
 106  * For HDCP2.2 on HDMI and DP SST this value is always 1.
 107  */
 108 #define HDCP_2_2_MAX_CONTENT_STREAMS_CNT        1
 109 #define HDCP_2_2_TXCAP_MASK_LEN                 2
 110 #define HDCP_2_2_RXCAPS_LEN                     3
 111 #define HDCP_2_2_RX_REPEATER(x)                 ((x) & BIT(0))
 112 #define HDCP_2_2_DP_HDCP_CAPABLE(x)             ((x) & BIT(1))
 113 #define HDCP_2_2_RXINFO_LEN                     2
 114
 115 /* HDCP1.x compliant device in downstream */
 116 #define HDCP_2_2_HDCP1_DEVICE_CONNECTED(x)      ((x) & BIT(0))
 117
 118 /* HDCP2.0 Compliant repeater in downstream */
 119 #define HDCP_2_2_HDCP_2_0_REP_CONNECTED(x)      ((x) & BIT(1))
 120 #define HDCP_2_2_MAX_CASCADE_EXCEEDED(x)        ((x) & BIT(2))
 121 #define HDCP_2_2_MAX_DEVS_EXCEEDED(x)           ((x) & BIT(3))
 122 #define HDCP_2_2_DEV_COUNT_LO(x)                (((x) & (0xF << 4)) >> 4)
 123 #define HDCP_2_2_DEV_COUNT_HI(x)                ((x) & BIT(0))
 124 #define HDCP_2_2_DEPTH(x)                       (((x) & (0x7 << 1)) >> 1)
 125
 126 struct hdcp2_cert_rx {
 127         u8      receiver_id[HDCP_2_2_RECEIVER_ID_LEN];
 128         u8      kpub_rx[HDCP_2_2_K_PUB_RX_LEN];
 129         u8      reserved[2];
 130         u8      dcp_signature[HDCP_2_2_DCP_LLC_SIG_LEN];
 131 } __packed;
 132
 133 struct hdcp2_streamid_type {
 134         u8      stream_id;
 135         u8      stream_type;
 136 } __packed;
 137
 138 /*
 139  * The TxCaps field specified in the HDCP HDMI, DP specs
 140  * This field is big endian as specified in the errata.
 141  */
 142 struct hdcp2_tx_caps {
 143         /* Transmitter must set this to 0x2 */
 144         u8      version;
 145
 146         /* Reserved for HDCP and DP Spec. Read as Zero */
 147         u8      tx_cap_mask[HDCP_2_2_TXCAP_MASK_LEN];
 148 } __packed;
 149
 150 /* Main structures for HDCP2.2 protocol communication */
 151 struct hdcp2_ake_init {
 152         u8                      msg_id;
 153         u8                      r_tx[HDCP_2_2_RTX_LEN];
 154         struct hdcp2_tx_caps    tx_caps;
 155 } __packed;
 156
 157 struct hdcp2_ake_send_cert {
 158         u8                      msg_id;
 159         struct hdcp2_cert_rx    cert_rx;
 160         u8                      r_rx[HDCP_2_2_RRX_LEN];
 161         u8                      rx_caps[HDCP_2_2_RXCAPS_LEN];
 162 } __packed;
 163
 164 struct hdcp2_ake_no_stored_km {
 165         u8      msg_id;
 166         u8      e_kpub_km[HDCP_2_2_E_KPUB_KM_LEN];
 167 } __packed;
 168
 169 struct hdcp2_ake_stored_km {
 170         u8      msg_id;
 171         u8      e_kh_km_m[HDCP_2_2_E_KH_KM_M_LEN];
 172 } __packed;
 173
 174 struct hdcp2_ake_send_hprime {
 175         u8      msg_id;
 176         u8      h_prime[HDCP_2_2_H_PRIME_LEN];
 177 } __packed;
 178
 179 struct hdcp2_ake_send_pairing_info {
 180         u8      msg_id;
 181         u8      e_kh_km[HDCP_2_2_E_KH_KM_LEN];
 182 } __packed;
 183
 184 struct hdcp2_lc_init {
 185         u8      msg_id;
 186         u8      r_n[HDCP_2_2_RN_LEN];
 187 } __packed;
 188
 189 struct hdcp2_lc_send_lprime {
 190         u8      msg_id;
 191         u8      l_prime[HDCP_2_2_L_PRIME_LEN];
 192 } __packed;
 193
 194 struct hdcp2_ske_send_eks {
 195         u8      msg_id;
 196         u8      e_dkey_ks[HDCP_2_2_E_DKEY_KS_LEN];
 197         u8      riv[HDCP_2_2_RIV_LEN];
 198 } __packed;
 199
 200 struct hdcp2_rep_send_receiverid_list {
 201         u8      msg_id;
 202         u8      rx_info[HDCP_2_2_RXINFO_LEN];
 203         u8      seq_num_v[HDCP_2_2_SEQ_NUM_LEN];
 204         u8      v_prime[HDCP_2_2_V_PRIME_HALF_LEN];
 205         u8      receiver_ids[HDCP_2_2_RECEIVER_IDS_MAX_LEN];
 206 } __packed;
 207
 208 struct hdcp2_rep_send_ack {
 209         u8      msg_id;
 210         u8      v[HDCP_2_2_V_PRIME_HALF_LEN];
 211 } __packed;
 212
 213 struct hdcp2_rep_stream_manage {
 214         u8                      msg_id;
 215         u8                      seq_num_m[HDCP_2_2_SEQ_NUM_LEN];
 216         __be16                  k;
 217         struct hdcp2_streamid_type streams[HDCP_2_2_MAX_CONTENT_STREAMS_CNT];
 218 } __packed;
 219
 220 struct hdcp2_rep_stream_ready {
 221         u8      msg_id;
 222         u8      m_prime[HDCP_2_2_MPRIME_LEN];
 223 } __packed;
 224
 225 /* HDCP2.2 TIMEOUTs in mSec */
 226 #define HDCP_2_2_CERT_TIMEOUT_MS                100
 227 #define HDCP_2_2_HPRIME_NO_PAIRED_TIMEOUT_MS    1000
 228 #define HDCP_2_2_HPRIME_PAIRED_TIMEOUT_MS       200
 229 #define HDCP_2_2_PAIRING_TIMEOUT_MS             200
 230 #define HDCP_2_2_HDMI_LPRIME_TIMEOUT_MS         20
 231 #define HDCP_2_2_DP_LPRIME_TIMEOUT_MS           7
 232 #define HDCP_2_2_RECVID_LIST_TIMEOUT_MS         3000
 233 #define HDCP_2_2_STREAM_READY_TIMEOUT_MS        100
 234
 235 /* HDMI HDCP2.2 Register Offsets */
 236 #define HDCP_2_2_HDMI_REG_VER_OFFSET            0x50
 237 #define HDCP_2_2_HDMI_REG_WR_MSG_OFFSET         0x60
 238 #define HDCP_2_2_HDMI_REG_RXSTATUS_OFFSET       0x70
 239 #define HDCP_2_2_HDMI_REG_RD_MSG_OFFSET         0x80
 240 #define HDCP_2_2_HDMI_REG_DBG_OFFSET            0xC0
 241
 242 #define HDCP_2_2_HDMI_SUPPORT_MASK              BIT(2)
 243 #define HDCP_2_2_RX_CAPS_VERSION_VAL            0x02
 244 #define HDCP_2_2_SEQ_NUM_MAX                    0xFFFFFF
 245 #define HDCP_2_2_DELAY_BEFORE_ENCRYPTION_EN     200
 246
 247 /* Below macros take a byte at a time and mask the bit(s) */
 248 #define HDCP_2_2_HDMI_RXSTATUS_LEN              2
 249 #define HDCP_2_2_HDMI_RXSTATUS_MSG_SZ_HI(x)     ((x) & 0x3)
 250 #define HDCP_2_2_HDMI_RXSTATUS_READY(x)         ((x) & BIT(2))
 251 #define HDCP_2_2_HDMI_RXSTATUS_REAUTH_REQ(x)    ((x) & BIT(3))
 252
 253 /*
 254  * Helper functions to convert 24bit big endian hdcp sequence number to
 255  * host format and back
 256  */
 257 static inline
 258 u32 drm_hdcp_be24_to_cpu(const u8 seq_num[HDCP_2_2_SEQ_NUM_LEN])
 259 {
 260         return (u32)(seq_num[2] | seq_num[1] << 8 | seq_num[0] << 16);
 261 }
 262
 263 static inline
 264 void drm_hdcp_cpu_to_be24(u8 seq_num[HDCP_2_2_SEQ_NUM_LEN], u32 val)
 265 {
 266         seq_num[0] = val >> 16;
 267         seq_num[1] = val >> 8;
 268         seq_num[2] = val;
 269 }
 270
 271 #define DRM_HDCP_SRM_GEN1_MAX_BYTES             (5 * 1024)
 272 #define DRM_HDCP_1_4_SRM_ID                     0x8
 273 #define DRM_HDCP_SRM_ID_MASK                    (0xF << 4)
 274 #define DRM_HDCP_1_4_VRL_LENGTH_SIZE            3
 275 #define DRM_HDCP_1_4_DCP_SIG_SIZE               40
 276 #define DRM_HDCP_2_SRM_ID                       0x9
 277 #define DRM_HDCP_2_INDICATOR                    0x1
 278 #define DRM_HDCP_2_INDICATOR_MASK               0xF
 279 #define DRM_HDCP_2_VRL_LENGTH_SIZE              3
 280 #define DRM_HDCP_2_DCP_SIG_SIZE                 384
 281 #define DRM_HDCP_2_NO_OF_DEV_PLUS_RESERVED_SZ   4
 282 #define DRM_HDCP_2_KSV_COUNT_2_LSBITS(byte)     (((byte) & 0xC0) >> 6)
 283
 284 struct hdcp_srm_header {
 285         u8 srm_id;
 286         u8 reserved;
 287         __be16 srm_version;
 288         u8 srm_gen_no;
 289 } __packed;
 290
 291 struct drm_device;
 292 struct drm_connector;
 293
 294 int drm_hdcp_check_ksvs_revoked(struct drm_device *dev,
 295                                 u8 *ksvs, u32 ksv_count);
 296 int drm_connector_attach_content_protection_property(
 297                 struct drm_connector *connector, bool hdcp_content_type);
 298 void drm_hdcp_update_content_protection(struct drm_connector *connector,
 299                                         u64 val);
 300
 301 /* Content Type classification for HDCP2.2 vs others */
 302 #define DRM_MODE_HDCP_CONTENT_TYPE0             0
 303 #define DRM_MODE_HDCP_CONTENT_TYPE1             1
 304
 305 #endif