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-rw-r--r--include/drm/display/drm_hdcp.h298
1 files changed, 298 insertions, 0 deletions
diff --git a/include/drm/display/drm_hdcp.h b/include/drm/display/drm_hdcp.h
new file mode 100644
index 000000000000..96a99b1377c0
--- /dev/null
+++ b/include/drm/display/drm_hdcp.h
@@ -0,0 +1,298 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright (C) 2017 Google, Inc.
+ *
+ * Authors:
+ * Sean Paul <seanpaul@chromium.org>
+ */
+
+#ifndef _DRM_HDCP_H_
+#define _DRM_HDCP_H_
+
+#include <linux/types.h>
+
+/* Period of hdcp checks (to ensure we're still authenticated) */
+#define DRM_HDCP_CHECK_PERIOD_MS (128 * 16)
+#define DRM_HDCP2_CHECK_PERIOD_MS 500
+
+/* Shared lengths/masks between HDMI/DVI/DisplayPort */
+#define DRM_HDCP_AN_LEN 8
+#define DRM_HDCP_BSTATUS_LEN 2
+#define DRM_HDCP_KSV_LEN 5
+#define DRM_HDCP_RI_LEN 2
+#define DRM_HDCP_V_PRIME_PART_LEN 4
+#define DRM_HDCP_V_PRIME_NUM_PARTS 5
+#define DRM_HDCP_NUM_DOWNSTREAM(x) (x & 0x7f)
+#define DRM_HDCP_MAX_CASCADE_EXCEEDED(x) (x & BIT(3))
+#define DRM_HDCP_MAX_DEVICE_EXCEEDED(x) (x & BIT(7))
+
+/* Slave address for the HDCP registers in the receiver */
+#define DRM_HDCP_DDC_ADDR 0x3A
+
+/* Value to use at the end of the SHA-1 bytestream used for repeaters */
+#define DRM_HDCP_SHA1_TERMINATOR 0x80
+
+/* HDCP register offsets for HDMI/DVI devices */
+#define DRM_HDCP_DDC_BKSV 0x00
+#define DRM_HDCP_DDC_RI_PRIME 0x08
+#define DRM_HDCP_DDC_AKSV 0x10
+#define DRM_HDCP_DDC_AN 0x18
+#define DRM_HDCP_DDC_V_PRIME(h) (0x20 + h * 4)
+#define DRM_HDCP_DDC_BCAPS 0x40
+#define DRM_HDCP_DDC_BCAPS_REPEATER_PRESENT BIT(6)
+#define DRM_HDCP_DDC_BCAPS_KSV_FIFO_READY BIT(5)
+#define DRM_HDCP_DDC_BSTATUS 0x41
+#define DRM_HDCP_DDC_KSV_FIFO 0x43
+
+#define DRM_HDCP_1_4_SRM_ID 0x8
+#define DRM_HDCP_1_4_VRL_LENGTH_SIZE 3
+#define DRM_HDCP_1_4_DCP_SIG_SIZE 40
+
+/* Protocol message definition for HDCP2.2 specification */
+/*
+ * Protected content streams are classified into 2 types:
+ * - Type0: Can be transmitted with HDCP 1.4+
+ * - Type1: Can be transmitted with HDCP 2.2+
+ */
+#define HDCP_STREAM_TYPE0 0x00
+#define HDCP_STREAM_TYPE1 0x01
+
+/* HDCP2.2 Msg IDs */
+#define HDCP_2_2_NULL_MSG 1
+#define HDCP_2_2_AKE_INIT 2
+#define HDCP_2_2_AKE_SEND_CERT 3
+#define HDCP_2_2_AKE_NO_STORED_KM 4
+#define HDCP_2_2_AKE_STORED_KM 5
+#define HDCP_2_2_AKE_SEND_HPRIME 7
+#define HDCP_2_2_AKE_SEND_PAIRING_INFO 8
+#define HDCP_2_2_LC_INIT 9
+#define HDCP_2_2_LC_SEND_LPRIME 10
+#define HDCP_2_2_SKE_SEND_EKS 11
+#define HDCP_2_2_REP_SEND_RECVID_LIST 12
+#define HDCP_2_2_REP_SEND_ACK 15
+#define HDCP_2_2_REP_STREAM_MANAGE 16
+#define HDCP_2_2_REP_STREAM_READY 17
+
+#define HDCP_2_2_RTX_LEN 8
+#define HDCP_2_2_RRX_LEN 8
+
+#define HDCP_2_2_K_PUB_RX_MOD_N_LEN 128
+#define HDCP_2_2_K_PUB_RX_EXP_E_LEN 3
+#define HDCP_2_2_K_PUB_RX_LEN (HDCP_2_2_K_PUB_RX_MOD_N_LEN + \
+ HDCP_2_2_K_PUB_RX_EXP_E_LEN)
+
+#define HDCP_2_2_DCP_LLC_SIG_LEN 384
+
+#define HDCP_2_2_E_KPUB_KM_LEN 128
+#define HDCP_2_2_E_KH_KM_M_LEN (16 + 16)
+#define HDCP_2_2_H_PRIME_LEN 32
+#define HDCP_2_2_E_KH_KM_LEN 16
+#define HDCP_2_2_RN_LEN 8
+#define HDCP_2_2_L_PRIME_LEN 32
+#define HDCP_2_2_E_DKEY_KS_LEN 16
+#define HDCP_2_2_RIV_LEN 8
+#define HDCP_2_2_SEQ_NUM_LEN 3
+#define HDCP_2_2_V_PRIME_HALF_LEN (HDCP_2_2_L_PRIME_LEN / 2)
+#define HDCP_2_2_RECEIVER_ID_LEN DRM_HDCP_KSV_LEN
+#define HDCP_2_2_MAX_DEVICE_COUNT 31
+#define HDCP_2_2_RECEIVER_IDS_MAX_LEN (HDCP_2_2_RECEIVER_ID_LEN * \
+ HDCP_2_2_MAX_DEVICE_COUNT)
+#define HDCP_2_2_MPRIME_LEN 32
+
+/* Following Macros take a byte at a time for bit(s) masking */
+/*
+ * TODO: HDCP_2_2_MAX_CONTENT_STREAMS_CNT is based upon actual
+ * H/W MST streams capacity.
+ * This required to be moved out to platform specific header.
+ */
+#define HDCP_2_2_MAX_CONTENT_STREAMS_CNT 4
+#define HDCP_2_2_TXCAP_MASK_LEN 2
+#define HDCP_2_2_RXCAPS_LEN 3
+#define HDCP_2_2_RX_REPEATER(x) ((x) & BIT(0))
+#define HDCP_2_2_DP_HDCP_CAPABLE(x) ((x) & BIT(1))
+#define HDCP_2_2_RXINFO_LEN 2
+
+/* HDCP1.x compliant device in downstream */
+#define HDCP_2_2_HDCP1_DEVICE_CONNECTED(x) ((x) & BIT(0))
+
+/* HDCP2.0 Compliant repeater in downstream */
+#define HDCP_2_2_HDCP_2_0_REP_CONNECTED(x) ((x) & BIT(1))
+#define HDCP_2_2_MAX_CASCADE_EXCEEDED(x) ((x) & BIT(2))
+#define HDCP_2_2_MAX_DEVS_EXCEEDED(x) ((x) & BIT(3))
+#define HDCP_2_2_DEV_COUNT_LO(x) (((x) & (0xF << 4)) >> 4)
+#define HDCP_2_2_DEV_COUNT_HI(x) ((x) & BIT(0))
+#define HDCP_2_2_DEPTH(x) (((x) & (0x7 << 1)) >> 1)
+
+struct hdcp2_cert_rx {
+ u8 receiver_id[HDCP_2_2_RECEIVER_ID_LEN];
+ u8 kpub_rx[HDCP_2_2_K_PUB_RX_LEN];
+ u8 reserved[2];
+ u8 dcp_signature[HDCP_2_2_DCP_LLC_SIG_LEN];
+} __packed;
+
+struct hdcp2_streamid_type {
+ u8 stream_id;
+ u8 stream_type;
+} __packed;
+
+/*
+ * The TxCaps field specified in the HDCP HDMI, DP specs
+ * This field is big endian as specified in the errata.
+ */
+struct hdcp2_tx_caps {
+ /* Transmitter must set this to 0x2 */
+ u8 version;
+
+ /* Reserved for HDCP and DP Spec. Read as Zero */
+ u8 tx_cap_mask[HDCP_2_2_TXCAP_MASK_LEN];
+} __packed;
+
+/* Main structures for HDCP2.2 protocol communication */
+struct hdcp2_ake_init {
+ u8 msg_id;
+ u8 r_tx[HDCP_2_2_RTX_LEN];
+ struct hdcp2_tx_caps tx_caps;
+} __packed;
+
+struct hdcp2_ake_send_cert {
+ u8 msg_id;
+ struct hdcp2_cert_rx cert_rx;
+ u8 r_rx[HDCP_2_2_RRX_LEN];
+ u8 rx_caps[HDCP_2_2_RXCAPS_LEN];
+} __packed;
+
+struct hdcp2_ake_no_stored_km {
+ u8 msg_id;
+ u8 e_kpub_km[HDCP_2_2_E_KPUB_KM_LEN];
+} __packed;
+
+struct hdcp2_ake_stored_km {
+ u8 msg_id;
+ u8 e_kh_km_m[HDCP_2_2_E_KH_KM_M_LEN];
+} __packed;
+
+struct hdcp2_ake_send_hprime {
+ u8 msg_id;
+ u8 h_prime[HDCP_2_2_H_PRIME_LEN];
+} __packed;
+
+struct hdcp2_ake_send_pairing_info {
+ u8 msg_id;
+ u8 e_kh_km[HDCP_2_2_E_KH_KM_LEN];
+} __packed;
+
+struct hdcp2_lc_init {
+ u8 msg_id;
+ u8 r_n[HDCP_2_2_RN_LEN];
+} __packed;
+
+struct hdcp2_lc_send_lprime {
+ u8 msg_id;
+ u8 l_prime[HDCP_2_2_L_PRIME_LEN];
+} __packed;
+
+struct hdcp2_ske_send_eks {
+ u8 msg_id;
+ u8 e_dkey_ks[HDCP_2_2_E_DKEY_KS_LEN];
+ u8 riv[HDCP_2_2_RIV_LEN];
+} __packed;
+
+struct hdcp2_rep_send_receiverid_list {
+ u8 msg_id;
+ u8 rx_info[HDCP_2_2_RXINFO_LEN];
+ u8 seq_num_v[HDCP_2_2_SEQ_NUM_LEN];
+ u8 v_prime[HDCP_2_2_V_PRIME_HALF_LEN];
+ u8 receiver_ids[HDCP_2_2_RECEIVER_IDS_MAX_LEN];
+} __packed;
+
+struct hdcp2_rep_send_ack {
+ u8 msg_id;
+ u8 v[HDCP_2_2_V_PRIME_HALF_LEN];
+} __packed;
+
+struct hdcp2_rep_stream_manage {
+ u8 msg_id;
+ u8 seq_num_m[HDCP_2_2_SEQ_NUM_LEN];
+ __be16 k;
+ struct hdcp2_streamid_type streams[HDCP_2_2_MAX_CONTENT_STREAMS_CNT];
+} __packed;
+
+struct hdcp2_rep_stream_ready {
+ u8 msg_id;
+ u8 m_prime[HDCP_2_2_MPRIME_LEN];
+} __packed;
+
+/* HDCP2.2 TIMEOUTs in mSec */
+#define HDCP_2_2_CERT_TIMEOUT_MS 100
+#define HDCP_2_2_DP_CERT_READ_TIMEOUT_MS 110
+#define HDCP_2_2_HPRIME_NO_PAIRED_TIMEOUT_MS 1000
+#define HDCP_2_2_HPRIME_PAIRED_TIMEOUT_MS 200
+#define HDCP_2_2_DP_HPRIME_READ_TIMEOUT_MS 7
+#define HDCP_2_2_PAIRING_TIMEOUT_MS 200
+#define HDCP_2_2_DP_PAIRING_READ_TIMEOUT_MS 5
+#define HDCP_2_2_HDMI_LPRIME_TIMEOUT_MS 20
+#define HDCP_2_2_DP_LPRIME_TIMEOUT_MS 16
+#define HDCP_2_2_RECVID_LIST_TIMEOUT_MS 3000
+#define HDCP_2_2_STREAM_READY_TIMEOUT_MS 100
+
+/* HDMI HDCP2.2 Register Offsets */
+#define HDCP_2_2_HDMI_REG_VER_OFFSET 0x50
+#define HDCP_2_2_HDMI_REG_WR_MSG_OFFSET 0x60
+#define HDCP_2_2_HDMI_REG_RXSTATUS_OFFSET 0x70
+#define HDCP_2_2_HDMI_REG_RD_MSG_OFFSET 0x80
+#define HDCP_2_2_HDMI_REG_DBG_OFFSET 0xC0
+
+#define HDCP_2_2_HDMI_SUPPORT_MASK BIT(2)
+#define HDCP_2_2_RX_CAPS_VERSION_VAL 0x02
+#define HDCP_2_2_SEQ_NUM_MAX 0xFFFFFF
+#define HDCP_2_2_DELAY_BEFORE_ENCRYPTION_EN 200
+
+/* Below macros take a byte at a time and mask the bit(s) */
+#define HDCP_2_2_HDMI_RXSTATUS_LEN 2
+#define HDCP_2_2_HDMI_RXSTATUS_MSG_SZ_HI(x) ((x) & 0x3)
+#define HDCP_2_2_HDMI_RXSTATUS_READY(x) ((x) & BIT(2))
+#define HDCP_2_2_HDMI_RXSTATUS_REAUTH_REQ(x) ((x) & BIT(3))
+
+/*
+ * Helper functions to convert 24bit big endian hdcp sequence number to
+ * host format and back
+ */
+static inline
+u32 drm_hdcp_be24_to_cpu(const u8 seq_num[HDCP_2_2_SEQ_NUM_LEN])
+{
+ return (u32)(seq_num[2] | seq_num[1] << 8 | seq_num[0] << 16);
+}
+
+static inline
+void drm_hdcp_cpu_to_be24(u8 seq_num[HDCP_2_2_SEQ_NUM_LEN], u32 val)
+{
+ seq_num[0] = val >> 16;
+ seq_num[1] = val >> 8;
+ seq_num[2] = val;
+}
+
+#define DRM_HDCP_SRM_GEN1_MAX_BYTES (5 * 1024)
+#define DRM_HDCP_1_4_SRM_ID 0x8
+#define DRM_HDCP_SRM_ID_MASK (0xF << 4)
+#define DRM_HDCP_1_4_VRL_LENGTH_SIZE 3
+#define DRM_HDCP_1_4_DCP_SIG_SIZE 40
+#define DRM_HDCP_2_SRM_ID 0x9
+#define DRM_HDCP_2_INDICATOR 0x1
+#define DRM_HDCP_2_INDICATOR_MASK 0xF
+#define DRM_HDCP_2_VRL_LENGTH_SIZE 3
+#define DRM_HDCP_2_DCP_SIG_SIZE 384
+#define DRM_HDCP_2_NO_OF_DEV_PLUS_RESERVED_SZ 4
+#define DRM_HDCP_2_KSV_COUNT_2_LSBITS(byte) (((byte) & 0xC0) >> 6)
+
+struct hdcp_srm_header {
+ u8 srm_id;
+ u8 reserved;
+ __be16 srm_version;
+ u8 srm_gen_no;
+} __packed;
+
+/* Content Type classification for HDCP2.2 vs others */
+#define DRM_MODE_HDCP_CONTENT_TYPE0 0
+#define DRM_MODE_HDCP_CONTENT_TYPE1 1
+
+#endif