// SPDX-License-Identifier: GPL-2.0
/*
* Cadence MHDP8546 DP bridge driver.
*
* Copyright (C) 2020 Cadence Design Systems, Inc.
*
*/
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/unaligned.h>
#include <drm/display/drm_hdcp_helper.h>
#include "cdns-mhdp8546-hdcp.h"
static int cdns_mhdp_secure_mailbox_read(struct cdns_mhdp_device *mhdp)
{
int ret, empty;
WARN_ON(!mutex_is_locked(&mhdp->mbox_mutex));
ret = readx_poll_timeout(readl, mhdp->sapb_regs + CDNS_MAILBOX_EMPTY,
empty, !empty, MAILBOX_RETRY_US,
MAILBOX_TIMEOUT_US);
if (ret < 0)
return ret;
return readl(mhdp->sapb_regs + CDNS_MAILBOX_RX_DATA) & 0xff;
}
static int cdns_mhdp_secure_mailbox_write(struct cdns_mhdp_device *mhdp,
u8 val)
{
int ret, full;
WARN_ON(!mutex_is_locked(&mhdp->mbox_mutex));
ret = readx_poll_timeout(readl, mhdp->sapb_regs + CDNS_MAILBOX_FULL,
full, !full, MAILBOX_RETRY_US,
MAILBOX_TIMEOUT_US);
if (ret < 0)
return ret;
writel(val, mhdp->sapb_regs + CDNS_MAILBOX_TX_DATA);
return 0;
}
static int cdns_mhdp_secure_mailbox_recv_header(struct cdns_mhdp_device *mhdp,
u8 module_id,
u8 opcode,
u16 req_size)
{
u32 mbox_size, i;
u8 header[4];
int ret;
/* read the header of the message */
for (i = 0; i < sizeof(header); i++) {
ret = cdns_mhdp_secure_mailbox_read(mhdp);
if (ret < 0)
return ret;
header[i] = ret;
}
mbox_size = get_unaligned_be16(header + 2);
if (opcode != header[0] || module_id != header[1] ||
(opcode != HDCP_TRAN_IS_REC_ID_VALID && req_size != mbox_size)) {
for (i = 0; i < mbox_size; i++)
if (cdns_mhdp_secure_mailbox_read(mhdp) < 0)
break;
return -EINVAL;
}
return 0;
}
static int cdns_mhdp_secure_mailbox_recv_data(struct cdns_mhdp_device *mhdp,
u8 *buff, u16 buff_size)
{
int ret;
u32 i;
for (i = 0; i < buff_size; i++) {
ret = cdns_mhdp_secure_mailbox_read(mhdp);
if (ret < 0)
return ret;
buff[i] = ret;
}
return 0;
}
static int cdns_mhdp_secure_mailbox_send(struct cdns_mhdp_device *mhdp,
u8 module_id,
u8 opcode,
u16 size,
u8 *message)
{
u8 header[4];
int ret;
u32 i;
header[0] = opcode;
header[1] = module_id;
put_unaligned_be16(size, header + 2);
for (i = 0; i < sizeof(header); i++) {
ret = cdns_mhdp_secure_mailbox_write(mhdp, header[i]);
if (ret)
return ret;
}
for (i = 0; i < size; i++) {
ret = cdns_mhdp_secure_mailbox_write(mhdp, message[i]);
if (ret)
return ret;
}
return 0;
}
static int cdns_mhdp_hdcp_get_status(struct cdns_mhdp_device *mhdp,
u16 *hdcp_port_status)
{
u8 hdcp_status[HDCP_STATUS_SIZE];
int ret;
mutex_lock(&mhdp->mbox_mutex);
ret = cdns_mhdp_secure_mailbox_send(mhdp, MB_MODULE_ID_HDCP_TX,
HDCP_TRAN_STATUS_CHANGE, 0, NULL);
if (ret)
goto err_get_hdcp_status;
ret = cdns_mhdp_secure_mailbox_recv_header(mhdp, MB_MODULE_ID_HDCP_TX,
HDCP_TRAN_STATUS_CHANGE,
sizeof(hdcp_status));
if (ret)
goto err_get_hdcp_status;
ret = cdns_mhdp_secure_mailbox_recv_data(mhdp, hdcp_status,
sizeof(hdcp_status));
if (ret)
goto err_get_hdcp_status;
*hdcp_port_status = ((u16)(hdcp_status[0] << 8) | hdcp_status[1]);
err_get_hdcp_status:
mutex_unlock(&mhdp->mbox_mutex);
return ret;
}
static u8 cdns_mhdp_hdcp_handle_status(struct cdns_mhdp_device *mhdp,
u16 status)
{
u8 err = GET_HDCP_PORT_STS_LAST_ERR(status);
if (err)
dev_dbg(mhdp->dev, "HDCP Error = %d", err);
return err;
}
static int cdns_mhdp_hdcp_rx_id_valid_response(struct cdns_mhdp_device *mhdp,
u8 valid)
{
int ret;
mutex_lock(&mhdp->mbox_mutex);
ret = cdns_mhdp_secure_mailbox_send(mhdp, MB_MODULE_ID_HDCP_TX,
HDCP_TRAN_RESPOND_RECEIVER_ID_VALID,
1, &valid);
mutex_unlock(&mhdp->mbox_mutex);
return ret;
}
static int cdns_mhdp_hdcp_rx_id_valid(struct cdns_mhdp_device *mhdp,
u8 *recv_num, u8 *hdcp_rx_id)
{
u8 rec_id_hdr[2];
u8 status;
int ret;
mutex_lock(&mhdp->mbox_mutex);
ret = cdns_mhdp_secure_mailbox_send(mhdp, MB_MODULE_ID_HDCP_TX,
HDCP_TRAN_IS_REC_ID_VALID, 0, NULL);
if (ret)
goto err_rx_id_valid;
ret = cdns_mhdp_secure_mailbox_recv_header(mhdp, MB_MODULE_ID_HDCP_TX,
HDCP_TRAN_IS_REC_ID_VALID,
sizeof(status));
if (ret)
goto err_rx_id_valid;
ret = cdns_mhdp_secure_mailbox_recv_data(mhdp, rec_id_hdr, 2);
if (ret)
goto err_rx_id_valid;
*recv_num = rec_id_hdr[0];
ret = cdns_mhdp_secure_mailbox_recv_data(mhdp, hdcp_rx_id, 5 * *recv_num);
err_rx_id_valid:
mutex_unlock(&mhdp->mbox_mutex);
return ret;
}
static int cdns_mhdp_hdcp_km_stored_resp(struct cdns_mhdp_device *mhdp,
u32 size, u8 *km)
{
int ret;
mutex_lock(&mhdp->mbox_mutex);
ret = cdns_mhdp_secure_mailbox_send(mhdp, MB_MODULE_ID_HDCP_TX,
HDCP2X_TX_RESPOND_KM, size, km);
mutex_unlock(&mhdp->mbox_mutex);
return ret;
}
static int cdns_mhdp_hdcp_tx_is_km_stored(struct cdns_mhdp_device *mhdp,
u8 *resp, u32 size)
{
int ret;
mutex_lock(&mhdp->mbox_mutex);
ret = cdns_mhdp_secure_mailbox_send(mhdp, MB_MODULE_ID_HDCP_TX,
HDCP2X_TX_IS_KM_STORED, 0, NULL);
if (ret)
goto err_is_km_stored;
ret = cdns_mhdp_secure_mailbox_recv_header(mhdp, MB_MODULE_ID_HDCP_TX,
HDCP2X_TX_IS_KM_STORED,
size);
if (ret)
goto err_is_km_stored;
ret = cdns_mhdp_secure_mailbox_recv_data(mhdp, resp, size);
err_is_km_stored:
mutex_unlock(&mhdp->mbox_mutex);
return ret;
}
static int cdns_mhdp_hdcp_tx_config(struct cdns_mhdp_device *mhdp,
u8 hdcp_cfg)
{
int ret;
mutex_lock(&mhdp->mbox_mutex);
ret = cdns_mhdp_secure_mailbox_send(mhdp, MB_MODULE_ID_HDCP_TX,
HDCP_TRAN_CONFIGURATION, 1, &hdcp_cfg);
mutex_unlock(&mhdp->mbox_mutex);
return ret;
}
static int cdns_mhdp_hdcp_set_config(struct cdns_mhdp_device *mhdp,
u8 hdcp_config, bool enable)
{
u16 hdcp_port_status;
u32 ret_event;
u8 hdcp_cfg;
int ret;
hdcp_cfg = hdcp_config | (enable ? 0x04 : 0) |
(HDCP_CONTENT_TYPE_0 << 3);
cdns_mhdp_hdcp_tx_config(mhdp, hdcp_cfg);
ret_event = cdns_mhdp_wait_for_sw_event(mhdp, CDNS_HDCP_TX_STATUS);
if (!ret_event)
return -1;
ret = cdns_mhdp_hdcp_get_status(mhdp, &hdcp_port_status);
if (ret || cdns_mhdp_hdcp_handle_status(mhdp, hdcp_port_status))
return -1;
return 0;
}
static int cdns_mhdp_hdcp_auth_check(struct cdns_mhdp_device *mhdp)
{
u16 hdcp_port_status;
u32 ret_event;
int ret;
ret_event = cdns_mhdp_wait_for_sw_event(mhdp, CDNS_HDCP_TX_STATUS);
if (!ret_event)
return -1;
ret = cdns_mhdp_hdcp_get_status(mhdp, &hdcp_port_status);
if (ret || cdns_mhdp_hdcp_handle_status(mhdp, hdcp_port_status))
return -1;
if (hdcp_port_status & 1) {
dev_dbg(mhdp->dev, "Authentication completed successfully!\n");
return 0;
}
dev_dbg(mhdp->dev, "Authentication failed\n");
return -1;
}
static int cdns_mhdp_hdcp_check_receviers(struct cdns_mhdp_device *mhdp)
{
u8 hdcp_rec_id[HDCP_MAX_RECEIVERS][HDCP_RECEIVER_ID_SIZE_BYTES];
u8 hdcp_num_rec;
u32 ret_event;
ret_event = cdns_mhdp_wait_for_sw_event(mhdp,
CDNS_HDCP_TX_IS_RCVR_ID_VALID);
if (!ret_event)
return -1;
hdcp_num_rec = 0;
memset(&hdcp_rec_id, 0, sizeof(hdcp_rec_id));
cdns_mhdp_hdcp_rx_id_valid(mhdp, &hdcp_num_rec, (u8 *)hdcp_rec_id);
cdns_mhdp_hdcp_rx_id_valid_response(mhdp, 1);
return 0;
}
static int cdns_mhdp_hdcp_auth_22(struct cdns_mhdp_device *mhdp)
{
u8 resp[HDCP_STATUS_SIZE];
u16 hdcp_port_status;
u32 ret_event;
int ret;
dev_dbg(mhdp->dev, "HDCP: Start 2.2 Authentication\n");
ret_event = cdns_mhdp_wait_for_sw_event(mhdp,
CDNS_HDCP2_TX_IS_KM_STORED);
if (!ret_event)
return -1;
if (ret_event & CDNS_HDCP_TX_STATUS) {
mhdp->sw_events &= ~CDNS_HDCP_TX_STATUS;
ret = cdns_mhdp_hdcp_get_status(mhdp, &hdcp_port_status);
if (ret || cdns_mhdp_hdcp_handle_status(mhdp, hdcp_port_status))
return -1;
}
cdns_mhdp_hdcp_tx_is_km_stored(mhdp, resp, sizeof(resp));
cdns_mhdp_hdcp_km_stored_resp(mhdp, 0, NULL);
if (cdns_mhdp_hdcp_check_receviers(mhdp))
return -1;
return 0;
}
static inline int cdns_mhdp_hdcp_auth_14(struct cdns_mhdp_device *mhdp)
{
dev_dbg(mhdp->dev, "HDCP: Starting 1.4 Authentication\n");
return cdns_mhdp_hdcp_check_receviers(mhdp);
}
static int cdns_mhdp_hdcp_auth(struct cdns_mhdp_device *mhdp,
u8 hdcp_config)
{
int ret;
ret = cdns_mhdp_hdcp_set_config(mhdp, hdcp_config, true);
if (ret)
goto auth_failed;
if (hdcp_config == HDCP_TX_1)
ret = cdns_mhdp_hdcp_auth_14(mhdp);
else
ret = cdns_mhdp_hdcp_auth_22(mhdp);
if (ret)
goto auth_failed;
ret = cdns_mhdp_hdcp_auth_check(mhdp);
if (ret)
ret = cdns_mhdp_hdcp_auth_check(mhdp);
auth_failed:
return ret;
}
static int _cdns_mhdp_hdcp_disable(struct cdns_mhdp_device *mhdp)
{
int ret;
dev_dbg(mhdp->dev, "[%s:%d] HDCP is being disabled...\n",
mhdp->connector.name, mhdp->connector.base.id);
ret = cdns_mhdp_hdcp_set_config(mhdp, 0, false);
return ret;
}
static int _cdns_mhdp_hdcp_enable(struct cdns_mhdp_device *mhdp, u8 content_type)
{
int ret = -EINVAL;
int tries = 3;
u32 i;
for (i = 0; i < tries; i++) {
if (content_type == DRM_MODE_HDCP_CONTENT_TYPE0 ||
content_type == DRM_MODE_HDCP_CONTENT_TYPE1) {
ret = cdns_mhdp_hdcp_auth(mhdp, HDCP_TX_2);
if (!ret)
return 0;
_cdns_mhdp_hdcp_disable(mhdp);
}
if (content_type == DRM_MODE_HDCP_CONTENT_TYPE0) {
ret = cdns_mhdp_hdcp_auth(mhdp, HDCP_TX_1);
if (!ret)
return 0;
_cdns_mhdp_hdcp_disable(mhdp);
}
}
dev_err(mhdp->dev, "HDCP authentication failed (%d tries/%d)\n",
tries, ret);
return ret;
}
static int cdns_mhdp_hdcp_check_link(struct cdns_mhdp_device *mhdp)
{
u16 hdcp_port_status;
int ret = 0;
mutex_lock(&mhdp->hdcp.mutex);
if (mhdp->hdcp.value == DRM_MODE_CONTENT_PROTECTION_UNDESIRED)
goto out;
ret = cdns_mhdp_hdcp_get_status(mhdp, &hdcp_port_status);
if (!ret && hdcp_port_status & HDCP_PORT_STS_AUTH)
goto out;
dev_err(mhdp->dev,
"[%s:%d] HDCP link failed, retrying authentication\n",
mhdp->connector.name, mhdp->connector.base.id);
ret = _cdns_mhdp_hdcp_disable(mhdp);
if (ret) {
mhdp->hdcp.value = DRM_MODE_CONTENT_PROTECTION_DESIRED;
schedule_work(&mhdp->hdcp.prop_work);
goto out;
}
ret = _cdns_mhdp_hdcp_enable(mhdp, mhdp->hdcp.hdcp_content_type);
if (ret) {
mhdp->hdcp.value = DRM_MODE_CONTENT_PROTECTION_DESIRED;
schedule_work(&mhdp->hdcp.prop_work);
}
out:
mutex_unlock(&mhdp->hdcp.mutex);
return ret;
}
static void cdns_mhdp_hdcp_check_work(struct work_struct *work)
{
struct delayed_work *d_work = to_delayed_work(work);
struct cdns_mhdp_hdcp *hdcp = container_of(d_work,
struct cdns_mhdp_hdcp,
check_work);
struct cdns_mhdp_device *mhdp = container_of(hdcp,
struct cdns_mhdp_device,
hdcp);
if (!cdns_mhdp_hdcp_check_link(mhdp))
schedule_delayed_work(&hdcp->check_work,
DRM_HDCP_CHECK_PERIOD_MS);
}
static void cdns_mhdp_hdcp_prop_work(struct work_struct *work)
{
struct cdns_mhdp_hdcp *hdcp = container_of(work,
struct cdns_mhdp_hdcp,
prop_work);
struct cdns_mhdp_device *mhdp = container_of(hdcp,
struct cdns_mhdp_device,
hdcp);
struct drm_device *dev = mhdp->connector.dev;
struct drm_connector_state *state;
drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
mutex_lock(&mhdp->hdcp.mutex);
if (mhdp->hdcp.value != DRM_MODE_CONTENT_PROTECTION_UNDESIRED) {
state = mhdp->connector.state;
state->content_protection = mhdp->hdcp.value;
}
mutex_unlock(&mhdp->hdcp.mutex);
drm_modeset_unlock(&dev->mode_config.connection_mutex);
}
int cdns_mhdp_hdcp_set_lc(struct cdns_mhdp_device *mhdp, u8 *val)
{
int ret;
mutex_lock(&mhdp->mbox_mutex);
ret = cdns_mhdp_secure_mailbox_send(mhdp, MB_MODULE_ID_HDCP_GENERAL,
HDCP_GENERAL_SET_LC_128,
16, val);
mutex_unlock(&mhdp->mbox_mutex);
return ret;
}
int
cdns_mhdp_hdcp_set_public_key_param(struct cdns_mhdp_device *mhdp,
struct cdns_hdcp_tx_public_key_param *val)
{
int ret;
mutex_lock(&mhdp->mbox_mutex);
ret = cdns_mhdp_secure_mailbox_send(mhdp, MB_MODULE_ID_HDCP_TX,
HDCP2X_TX_SET_PUBLIC_KEY_PARAMS,
sizeof(*val), (u8 *)val);
mutex_unlock(&mhdp->mbox_mutex);
return ret;
}
int cdns_mhdp_hdcp_enable(struct cdns_mhdp_device *mhdp, u8 content_type)
{
int ret;
mutex_lock(&mhdp->hdcp.mutex);
ret = _cdns_mhdp_hdcp_enable(mhdp, content_type);
if (ret)
goto out;
mhdp->hdcp.hdcp_content_type = content_type;
mhdp->hdcp.value = DRM_MODE_CONTENT_PROTECTION_ENABLED;
schedule_work(&mhdp->hdcp.prop_work);
schedule_delayed_work(&mhdp->hdcp.check_work,
DRM_HDCP_CHECK_PERIOD_MS);
out:
mutex_unlock(&mhdp->hdcp.mutex);
return ret;
}
int cdns_mhdp_hdcp_disable(struct cdns_mhdp_device *mhdp)
{
int ret = 0;
mutex_lock(&mhdp->hdcp.mutex);
if (mhdp->hdcp.value != DRM_MODE_CONTENT_PROTECTION_UNDESIRED) {
mhdp->hdcp.value = DRM_MODE_CONTENT_PROTECTION_UNDESIRED;
schedule_work(&mhdp->hdcp.prop_work);
ret = _cdns_mhdp_hdcp_disable(mhdp);
}
mutex_unlock(&mhdp->hdcp.mutex);
cancel_delayed_work_sync(&mhdp->hdcp.check_work);
return ret;
}
void cdns_mhdp_hdcp_init(struct cdns_mhdp_device *mhdp)
{
INIT_DELAYED_WORK(&mhdp->hdcp.check_work, cdns_mhdp_hdcp_check_work);
INIT_WORK(&mhdp->hdcp.prop_work, cdns_mhdp_hdcp_prop_work);
mutex_init(&mhdp->hdcp.mutex);
}