303 lines
8.5 KiB
C
303 lines
8.5 KiB
C
/* SPDX-License-Identifier: MIT */
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/*
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* Copyright (C) 2017 Google, Inc.
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*
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* Authors:
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* Sean Paul <seanpaul@chromium.org>
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*/
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#ifndef _DRM_HDCP_H_INCLUDED_
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#define _DRM_HDCP_H_INCLUDED_
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#include <linux/types.h>
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/* Period of hdcp checks (to ensure we're still authenticated) */
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#define DRM_HDCP_CHECK_PERIOD_MS (128 * 16)
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#define DRM_HDCP2_CHECK_PERIOD_MS 500
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/* Shared lengths/masks between HDMI/DVI/DisplayPort */
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#define DRM_HDCP_AN_LEN 8
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#define DRM_HDCP_BSTATUS_LEN 2
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#define DRM_HDCP_KSV_LEN 5
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#define DRM_HDCP_RI_LEN 2
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#define DRM_HDCP_V_PRIME_PART_LEN 4
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#define DRM_HDCP_V_PRIME_NUM_PARTS 5
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#define DRM_HDCP_NUM_DOWNSTREAM(x) (x & 0x7f)
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#define DRM_HDCP_MAX_CASCADE_EXCEEDED(x) (x & BIT(3))
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#define DRM_HDCP_MAX_DEVICE_EXCEEDED(x) (x & BIT(7))
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/* Slave address for the HDCP registers in the receiver */
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#define DRM_HDCP_DDC_ADDR 0x3A
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/* HDCP register offsets for HDMI/DVI devices */
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#define DRM_HDCP_DDC_BKSV 0x00
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#define DRM_HDCP_DDC_RI_PRIME 0x08
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#define DRM_HDCP_DDC_AKSV 0x10
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#define DRM_HDCP_DDC_AN 0x18
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#define DRM_HDCP_DDC_V_PRIME(h) (0x20 + h * 4)
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#define DRM_HDCP_DDC_BCAPS 0x40
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#define DRM_HDCP_DDC_BCAPS_REPEATER_PRESENT BIT(6)
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#define DRM_HDCP_DDC_BCAPS_KSV_FIFO_READY BIT(5)
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#define DRM_HDCP_DDC_BSTATUS 0x41
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#define DRM_HDCP_DDC_KSV_FIFO 0x43
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#define DRM_HDCP_1_4_SRM_ID 0x8
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#define DRM_HDCP_1_4_VRL_LENGTH_SIZE 3
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#define DRM_HDCP_1_4_DCP_SIG_SIZE 40
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/* Protocol message definition for HDCP2.2 specification */
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/*
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* Protected content streams are classified into 2 types:
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* - Type0: Can be transmitted with HDCP 1.4+
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* - Type1: Can be transmitted with HDCP 2.2+
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*/
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#define HDCP_STREAM_TYPE0 0x00
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#define HDCP_STREAM_TYPE1 0x01
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/* HDCP2.2 Msg IDs */
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#define HDCP_2_2_NULL_MSG 1
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#define HDCP_2_2_AKE_INIT 2
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#define HDCP_2_2_AKE_SEND_CERT 3
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#define HDCP_2_2_AKE_NO_STORED_KM 4
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#define HDCP_2_2_AKE_STORED_KM 5
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#define HDCP_2_2_AKE_SEND_HPRIME 7
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#define HDCP_2_2_AKE_SEND_PAIRING_INFO 8
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#define HDCP_2_2_LC_INIT 9
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#define HDCP_2_2_LC_SEND_LPRIME 10
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#define HDCP_2_2_SKE_SEND_EKS 11
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#define HDCP_2_2_REP_SEND_RECVID_LIST 12
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#define HDCP_2_2_REP_SEND_ACK 15
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#define HDCP_2_2_REP_STREAM_MANAGE 16
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#define HDCP_2_2_REP_STREAM_READY 17
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#define HDCP_2_2_RTX_LEN 8
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#define HDCP_2_2_RRX_LEN 8
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#define HDCP_2_2_K_PUB_RX_MOD_N_LEN 128
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#define HDCP_2_2_K_PUB_RX_EXP_E_LEN 3
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#define HDCP_2_2_K_PUB_RX_LEN (HDCP_2_2_K_PUB_RX_MOD_N_LEN + \
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HDCP_2_2_K_PUB_RX_EXP_E_LEN)
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#define HDCP_2_2_DCP_LLC_SIG_LEN 384
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#define HDCP_2_2_E_KPUB_KM_LEN 128
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#define HDCP_2_2_E_KH_KM_M_LEN (16 + 16)
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#define HDCP_2_2_H_PRIME_LEN 32
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#define HDCP_2_2_E_KH_KM_LEN 16
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#define HDCP_2_2_RN_LEN 8
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#define HDCP_2_2_L_PRIME_LEN 32
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#define HDCP_2_2_E_DKEY_KS_LEN 16
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#define HDCP_2_2_RIV_LEN 8
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#define HDCP_2_2_SEQ_NUM_LEN 3
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#define HDCP_2_2_V_PRIME_HALF_LEN (HDCP_2_2_L_PRIME_LEN / 2)
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#define HDCP_2_2_RECEIVER_ID_LEN DRM_HDCP_KSV_LEN
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#define HDCP_2_2_MAX_DEVICE_COUNT 31
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#define HDCP_2_2_RECEIVER_IDS_MAX_LEN (HDCP_2_2_RECEIVER_ID_LEN * \
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HDCP_2_2_MAX_DEVICE_COUNT)
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#define HDCP_2_2_MPRIME_LEN 32
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/* Following Macros take a byte at a time for bit(s) masking */
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/*
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* TODO: This has to be changed for DP MST, as multiple stream on
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* same port is possible.
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* For HDCP2.2 on HDMI and DP SST this value is always 1.
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*/
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#define HDCP_2_2_MAX_CONTENT_STREAMS_CNT 1
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#define HDCP_2_2_TXCAP_MASK_LEN 2
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#define HDCP_2_2_RXCAPS_LEN 3
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#define HDCP_2_2_RX_REPEATER(x) ((x) & BIT(0))
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#define HDCP_2_2_DP_HDCP_CAPABLE(x) ((x) & BIT(1))
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#define HDCP_2_2_RXINFO_LEN 2
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/* HDCP1.x compliant device in downstream */
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#define HDCP_2_2_HDCP1_DEVICE_CONNECTED(x) ((x) & BIT(0))
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/* HDCP2.0 Compliant repeater in downstream */
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#define HDCP_2_2_HDCP_2_0_REP_CONNECTED(x) ((x) & BIT(1))
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#define HDCP_2_2_MAX_CASCADE_EXCEEDED(x) ((x) & BIT(2))
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#define HDCP_2_2_MAX_DEVS_EXCEEDED(x) ((x) & BIT(3))
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#define HDCP_2_2_DEV_COUNT_LO(x) (((x) & (0xF << 4)) >> 4)
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#define HDCP_2_2_DEV_COUNT_HI(x) ((x) & BIT(0))
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#define HDCP_2_2_DEPTH(x) (((x) & (0x7 << 1)) >> 1)
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struct hdcp2_cert_rx {
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u8 receiver_id[HDCP_2_2_RECEIVER_ID_LEN];
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u8 kpub_rx[HDCP_2_2_K_PUB_RX_LEN];
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u8 reserved[2];
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u8 dcp_signature[HDCP_2_2_DCP_LLC_SIG_LEN];
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} __packed;
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struct hdcp2_streamid_type {
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u8 stream_id;
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u8 stream_type;
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} __packed;
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/*
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* The TxCaps field specified in the HDCP HDMI, DP specs
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* This field is big endian as specified in the errata.
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*/
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struct hdcp2_tx_caps {
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/* Transmitter must set this to 0x2 */
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u8 version;
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/* Reserved for HDCP and DP Spec. Read as Zero */
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u8 tx_cap_mask[HDCP_2_2_TXCAP_MASK_LEN];
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} __packed;
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/* Main structures for HDCP2.2 protocol communication */
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struct hdcp2_ake_init {
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u8 msg_id;
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u8 r_tx[HDCP_2_2_RTX_LEN];
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struct hdcp2_tx_caps tx_caps;
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} __packed;
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struct hdcp2_ake_send_cert {
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u8 msg_id;
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struct hdcp2_cert_rx cert_rx;
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u8 r_rx[HDCP_2_2_RRX_LEN];
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u8 rx_caps[HDCP_2_2_RXCAPS_LEN];
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} __packed;
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struct hdcp2_ake_no_stored_km {
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u8 msg_id;
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u8 e_kpub_km[HDCP_2_2_E_KPUB_KM_LEN];
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} __packed;
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struct hdcp2_ake_stored_km {
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u8 msg_id;
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u8 e_kh_km_m[HDCP_2_2_E_KH_KM_M_LEN];
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} __packed;
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struct hdcp2_ake_send_hprime {
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u8 msg_id;
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u8 h_prime[HDCP_2_2_H_PRIME_LEN];
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} __packed;
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struct hdcp2_ake_send_pairing_info {
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u8 msg_id;
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u8 e_kh_km[HDCP_2_2_E_KH_KM_LEN];
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} __packed;
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struct hdcp2_lc_init {
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u8 msg_id;
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u8 r_n[HDCP_2_2_RN_LEN];
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} __packed;
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struct hdcp2_lc_send_lprime {
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u8 msg_id;
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u8 l_prime[HDCP_2_2_L_PRIME_LEN];
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} __packed;
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struct hdcp2_ske_send_eks {
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u8 msg_id;
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u8 e_dkey_ks[HDCP_2_2_E_DKEY_KS_LEN];
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u8 riv[HDCP_2_2_RIV_LEN];
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} __packed;
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struct hdcp2_rep_send_receiverid_list {
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u8 msg_id;
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u8 rx_info[HDCP_2_2_RXINFO_LEN];
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u8 seq_num_v[HDCP_2_2_SEQ_NUM_LEN];
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u8 v_prime[HDCP_2_2_V_PRIME_HALF_LEN];
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u8 receiver_ids[HDCP_2_2_RECEIVER_IDS_MAX_LEN];
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} __packed;
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struct hdcp2_rep_send_ack {
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u8 msg_id;
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u8 v[HDCP_2_2_V_PRIME_HALF_LEN];
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} __packed;
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struct hdcp2_rep_stream_manage {
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u8 msg_id;
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u8 seq_num_m[HDCP_2_2_SEQ_NUM_LEN];
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__be16 k;
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struct hdcp2_streamid_type streams[HDCP_2_2_MAX_CONTENT_STREAMS_CNT];
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} __packed;
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struct hdcp2_rep_stream_ready {
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u8 msg_id;
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u8 m_prime[HDCP_2_2_MPRIME_LEN];
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} __packed;
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/* HDCP2.2 TIMEOUTs in mSec */
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#define HDCP_2_2_CERT_TIMEOUT_MS 100
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#define HDCP_2_2_HPRIME_NO_PAIRED_TIMEOUT_MS 1000
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#define HDCP_2_2_HPRIME_PAIRED_TIMEOUT_MS 200
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#define HDCP_2_2_PAIRING_TIMEOUT_MS 200
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#define HDCP_2_2_HDMI_LPRIME_TIMEOUT_MS 20
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#define HDCP_2_2_DP_LPRIME_TIMEOUT_MS 7
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#define HDCP_2_2_RECVID_LIST_TIMEOUT_MS 3000
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#define HDCP_2_2_STREAM_READY_TIMEOUT_MS 100
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/* HDMI HDCP2.2 Register Offsets */
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#define HDCP_2_2_HDMI_REG_VER_OFFSET 0x50
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#define HDCP_2_2_HDMI_REG_WR_MSG_OFFSET 0x60
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#define HDCP_2_2_HDMI_REG_RXSTATUS_OFFSET 0x70
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#define HDCP_2_2_HDMI_REG_RD_MSG_OFFSET 0x80
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#define HDCP_2_2_HDMI_REG_DBG_OFFSET 0xC0
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#define HDCP_2_2_HDMI_SUPPORT_MASK BIT(2)
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#define HDCP_2_2_RX_CAPS_VERSION_VAL 0x02
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#define HDCP_2_2_SEQ_NUM_MAX 0xFFFFFF
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#define HDCP_2_2_DELAY_BEFORE_ENCRYPTION_EN 200
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/* Below macros take a byte at a time and mask the bit(s) */
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#define HDCP_2_2_HDMI_RXSTATUS_LEN 2
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#define HDCP_2_2_HDMI_RXSTATUS_MSG_SZ_HI(x) ((x) & 0x3)
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#define HDCP_2_2_HDMI_RXSTATUS_READY(x) ((x) & BIT(2))
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#define HDCP_2_2_HDMI_RXSTATUS_REAUTH_REQ(x) ((x) & BIT(3))
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/*
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* Helper functions to convert 24bit big endian hdcp sequence number to
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* host format and back
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*/
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static inline
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u32 drm_hdcp_be24_to_cpu(const u8 seq_num[HDCP_2_2_SEQ_NUM_LEN])
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{
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return (u32)(seq_num[2] | seq_num[1] << 8 | seq_num[0] << 16);
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}
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static inline
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void drm_hdcp_cpu_to_be24(u8 seq_num[HDCP_2_2_SEQ_NUM_LEN], u32 val)
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{
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seq_num[0] = val >> 16;
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seq_num[1] = val >> 8;
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seq_num[2] = val;
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}
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#define DRM_HDCP_SRM_GEN1_MAX_BYTES (5 * 1024)
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#define DRM_HDCP_1_4_SRM_ID 0x8
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#define DRM_HDCP_SRM_ID_MASK (0xF << 4)
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#define DRM_HDCP_1_4_VRL_LENGTH_SIZE 3
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#define DRM_HDCP_1_4_DCP_SIG_SIZE 40
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#define DRM_HDCP_2_SRM_ID 0x9
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#define DRM_HDCP_2_INDICATOR 0x1
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#define DRM_HDCP_2_INDICATOR_MASK 0xF
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#define DRM_HDCP_2_VRL_LENGTH_SIZE 3
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#define DRM_HDCP_2_DCP_SIG_SIZE 384
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#define DRM_HDCP_2_NO_OF_DEV_PLUS_RESERVED_SZ 4
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#define DRM_HDCP_2_KSV_COUNT_2_LSBITS(byte) (((byte) & 0xC) >> 6)
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struct hdcp_srm_header {
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u8 srm_id;
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u8 reserved;
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__be16 srm_version;
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u8 srm_gen_no;
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} __packed;
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struct drm_device;
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struct drm_connector;
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bool drm_hdcp_check_ksvs_revoked(struct drm_device *dev,
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u8 *ksvs, u32 ksv_count);
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int drm_connector_attach_content_protection_property(
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struct drm_connector *connector, bool hdcp_content_type);
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void drm_hdcp_update_content_protection(struct drm_connector *connector,
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u64 val);
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/* Content Type classification for HDCP2.2 vs others */
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#define DRM_MODE_HDCP_CONTENT_TYPE0 0
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#define DRM_MODE_HDCP_CONTENT_TYPE1 1
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#endif
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