diff options
Diffstat (limited to 'drivers/gpu/drm/msm/hdmi/hdmi_hdcp.c')
| -rw-r--r-- | drivers/gpu/drm/msm/hdmi/hdmi_hdcp.c | 1437 |
1 files changed, 1437 insertions, 0 deletions
diff --git a/drivers/gpu/drm/msm/hdmi/hdmi_hdcp.c b/drivers/gpu/drm/msm/hdmi/hdmi_hdcp.c new file mode 100644 index 000000000000..1dc9c34eb0df --- /dev/null +++ b/drivers/gpu/drm/msm/hdmi/hdmi_hdcp.c @@ -0,0 +1,1437 @@ +/* Copyright (c) 2010-2015, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include "hdmi.h" +#include <linux/qcom_scm.h> + +#define HDCP_REG_ENABLE 0x01 +#define HDCP_REG_DISABLE 0x00 +#define HDCP_PORT_ADDR 0x74 + +#define HDCP_INT_STATUS_MASK ( \ + HDMI_HDCP_INT_CTRL_AUTH_SUCCESS_INT | \ + HDMI_HDCP_INT_CTRL_AUTH_FAIL_INT | \ + HDMI_HDCP_INT_CTRL_AUTH_XFER_REQ_INT | \ + HDMI_HDCP_INT_CTRL_AUTH_XFER_DONE_INT) + +#define AUTH_WORK_RETRIES_TIME 100 +#define AUTH_RETRIES_TIME 30 + +/* QFPROM Registers for HDMI/HDCP */ +#define QFPROM_RAW_FEAT_CONFIG_ROW0_LSB 0x000000F8 +#define QFPROM_RAW_FEAT_CONFIG_ROW0_MSB 0x000000FC +#define HDCP_KSV_LSB 0x000060D8 +#define HDCP_KSV_MSB 0x000060DC + +enum DS_TYPE { /* type of downstream device */ + DS_UNKNOWN, + DS_RECEIVER, + DS_REPEATER, +}; + +enum hdmi_hdcp_state { + HDCP_STATE_NO_AKSV, + HDCP_STATE_INACTIVE, + HDCP_STATE_AUTHENTICATING, + HDCP_STATE_AUTHENTICATED, + HDCP_STATE_AUTH_FAILED +}; + +struct hdmi_hdcp_reg_data { + u32 reg_id; + u32 off; + char *name; + u32 reg_val; +}; + +struct hdmi_hdcp_ctrl { + struct hdmi *hdmi; + u32 auth_retries; + bool tz_hdcp; + enum hdmi_hdcp_state hdcp_state; + struct work_struct hdcp_auth_work; + struct work_struct hdcp_reauth_work; + +#define AUTH_ABORT_EV 1 +#define AUTH_RESULT_RDY_EV 2 + unsigned long auth_event; + wait_queue_head_t auth_event_queue; + + u32 ksv_fifo_w_index; + /* + * store aksv from qfprom + */ + u32 aksv_lsb; + u32 aksv_msb; + bool aksv_valid; + u32 ds_type; + u32 bksv_lsb; + u32 bksv_msb; + u8 dev_count; + u8 depth; + u8 ksv_list[5 * 127]; + bool max_cascade_exceeded; + bool max_dev_exceeded; +}; + +static int hdmi_ddc_read(struct hdmi *hdmi, u16 addr, u8 offset, + u8 *data, u16 data_len) +{ + int rc; + int retry = 5; + struct i2c_msg msgs[] = { + { + .addr = addr >> 1, + .flags = 0, + .len = 1, + .buf = &offset, + }, { + .addr = addr >> 1, + .flags = I2C_M_RD, + .len = data_len, + .buf = data, + } + }; + + DBG("Start DDC read"); +retry: + rc = i2c_transfer(hdmi->i2c, msgs, 2); + + retry--; + if (rc == 2) + rc = 0; + else if (retry > 0) + goto retry; + else + rc = -EIO; + + DBG("End DDC read %d", rc); + + return rc; +} + +#define HDCP_DDC_WRITE_MAX_BYTE_NUM 32 + +static int hdmi_ddc_write(struct hdmi *hdmi, u16 addr, u8 offset, + u8 *data, u16 data_len) +{ + int rc; + int retry = 10; + u8 buf[HDCP_DDC_WRITE_MAX_BYTE_NUM]; + struct i2c_msg msgs[] = { + { + .addr = addr >> 1, + .flags = 0, + .len = 1, + } + }; + + DBG("Start DDC write"); + if (data_len > (HDCP_DDC_WRITE_MAX_BYTE_NUM - 1)) { + pr_err("%s: write size too big\n", __func__); + return -ERANGE; + } + + buf[0] = offset; + memcpy(&buf[1], data, data_len); + msgs[0].buf = buf; + msgs[0].len = data_len + 1; +retry: + rc = i2c_transfer(hdmi->i2c, msgs, 1); + + retry--; + if (rc == 1) + rc = 0; + else if (retry > 0) + goto retry; + else + rc = -EIO; + + DBG("End DDC write %d", rc); + + return rc; +} + +static int hdmi_hdcp_scm_wr(struct hdmi_hdcp_ctrl *hdcp_ctrl, u32 *preg, + u32 *pdata, u32 count) +{ + struct hdmi *hdmi = hdcp_ctrl->hdmi; + struct qcom_scm_hdcp_req scm_buf[QCOM_SCM_HDCP_MAX_REQ_CNT]; + u32 resp, phy_addr, idx = 0; + int i, ret = 0; + + WARN_ON(!pdata || !preg || (count == 0)); + + if (hdcp_ctrl->tz_hdcp) { + phy_addr = (u32)hdmi->mmio_phy_addr; + + while (count) { + memset(scm_buf, 0, sizeof(scm_buf)); + for (i = 0; i < count && i < QCOM_SCM_HDCP_MAX_REQ_CNT; + i++) { + scm_buf[i].addr = phy_addr + preg[idx]; + scm_buf[i].val = pdata[idx]; + idx++; + } + ret = qcom_scm_hdcp_req(scm_buf, i, &resp); + + if (ret || resp) { + pr_err("%s: error: scm_call ret=%d resp=%u\n", + __func__, ret, resp); + ret = -EINVAL; + break; + } + + count -= i; + } + } else { + for (i = 0; i < count; i++) + hdmi_write(hdmi, preg[i], pdata[i]); + } + + return ret; +} + +void hdmi_hdcp_irq(struct hdmi_hdcp_ctrl *hdcp_ctrl) +{ + struct hdmi *hdmi = hdcp_ctrl->hdmi; + u32 reg_val, hdcp_int_status; + unsigned long flags; + + spin_lock_irqsave(&hdmi->reg_lock, flags); + reg_val = hdmi_read(hdmi, REG_HDMI_HDCP_INT_CTRL); + hdcp_int_status = reg_val & HDCP_INT_STATUS_MASK; + if (!hdcp_int_status) { + spin_unlock_irqrestore(&hdmi->reg_lock, flags); + return; + } + /* Clear Interrupts */ + reg_val |= hdcp_int_status << 1; + /* Clear AUTH_FAIL_INFO as well */ + if (hdcp_int_status & HDMI_HDCP_INT_CTRL_AUTH_FAIL_INT) + reg_val |= HDMI_HDCP_INT_CTRL_AUTH_FAIL_INFO_ACK; + hdmi_write(hdmi, REG_HDMI_HDCP_INT_CTRL, reg_val); + spin_unlock_irqrestore(&hdmi->reg_lock, flags); + + DBG("hdcp irq %x", hdcp_int_status); + + if (hdcp_int_status & HDMI_HDCP_INT_CTRL_AUTH_SUCCESS_INT) { + pr_info("%s:AUTH_SUCCESS_INT received\n", __func__); + if (HDCP_STATE_AUTHENTICATING == hdcp_ctrl->hdcp_state) { + set_bit(AUTH_RESULT_RDY_EV, &hdcp_ctrl->auth_event); + wake_up_all(&hdcp_ctrl->auth_event_queue); + } + } + + if (hdcp_int_status & HDMI_HDCP_INT_CTRL_AUTH_FAIL_INT) { + reg_val = hdmi_read(hdmi, REG_HDMI_HDCP_LINK0_STATUS); + pr_info("%s: AUTH_FAIL_INT rcvd, LINK0_STATUS=0x%08x\n", + __func__, reg_val); + if (HDCP_STATE_AUTHENTICATED == hdcp_ctrl->hdcp_state) + queue_work(hdmi->workq, &hdcp_ctrl->hdcp_reauth_work); + else if (HDCP_STATE_AUTHENTICATING == + hdcp_ctrl->hdcp_state) { + set_bit(AUTH_RESULT_RDY_EV, &hdcp_ctrl->auth_event); + wake_up_all(&hdcp_ctrl->auth_event_queue); + } + } +} + +static int hdmi_hdcp_msleep(struct hdmi_hdcp_ctrl *hdcp_ctrl, u32 ms, u32 ev) +{ + int rc; + + rc = wait_event_timeout(hdcp_ctrl->auth_event_queue, + !!test_bit(ev, &hdcp_ctrl->auth_event), + msecs_to_jiffies(ms)); + if (rc) { + pr_info("%s: msleep is canceled by event %d\n", + __func__, ev); + clear_bit(ev, &hdcp_ctrl->auth_event); + return -ECANCELED; + } + + return 0; +} + +static int hdmi_hdcp_read_validate_aksv(struct hdmi_hdcp_ctrl *hdcp_ctrl) +{ + struct hdmi *hdmi = hdcp_ctrl->hdmi; + + /* Fetch aksv from QFPROM, this info should be public. */ + hdcp_ctrl->aksv_lsb = hdmi_qfprom_read(hdmi, HDCP_KSV_LSB); + hdcp_ctrl->aksv_msb = hdmi_qfprom_read(hdmi, HDCP_KSV_MSB); + + /* check there are 20 ones in AKSV */ + if ((hweight32(hdcp_ctrl->aksv_lsb) + hweight32(hdcp_ctrl->aksv_msb)) + != 20) { + pr_err("%s: AKSV QFPROM doesn't have 20 1's, 20 0's\n", + __func__); + pr_err("%s: QFPROM AKSV chk failed (AKSV=%02x%08x)\n", + __func__, hdcp_ctrl->aksv_msb, + hdcp_ctrl->aksv_lsb); + return -EINVAL; + } + DBG("AKSV=%02x%08x", hdcp_ctrl->aksv_msb, hdcp_ctrl->aksv_lsb); + + return 0; +} + +static int reset_hdcp_ddc_failures(struct hdmi_hdcp_ctrl *hdcp_ctrl) +{ + struct hdmi *hdmi = hdcp_ctrl->hdmi; + u32 reg_val, failure, nack0; + int rc = 0; + + /* Check for any DDC transfer failures */ + reg_val = hdmi_read(hdmi, REG_HDMI_HDCP_DDC_STATUS); + failure = reg_val & HDMI_HDCP_DDC_STATUS_FAILED; + nack0 = reg_val & HDMI_HDCP_DDC_STATUS_NACK0; + DBG("HDCP_DDC_STATUS=0x%x, FAIL=%d, NACK0=%d", + reg_val, failure, nack0); + + if (failure) { + /* + * Indicates that the last HDCP HW DDC transfer failed. + * This occurs when a transfer is attempted with HDCP DDC + * disabled (HDCP_DDC_DISABLE=1) or the number of retries + * matches HDCP_DDC_RETRY_CNT. + * Failure occurred, let's clear it. + */ + DBG("DDC failure detected"); + + /* First, Disable DDC */ + hdmi_write(hdmi, REG_HDMI_HDCP_DDC_CTRL_0, + HDMI_HDCP_DDC_CTRL_0_DISABLE); + + /* ACK the Failure to Clear it */ + reg_val = hdmi_read(hdmi, REG_HDMI_HDCP_DDC_CTRL_1); + reg_val |= HDMI_HDCP_DDC_CTRL_1_FAILED_ACK; + hdmi_write(hdmi, REG_HDMI_HDCP_DDC_CTRL_1, reg_val); + + /* Check if the FAILURE got Cleared */ + reg_val = hdmi_read(hdmi, REG_HDMI_HDCP_DDC_STATUS); + if (reg_val & HDMI_HDCP_DDC_STATUS_FAILED) + pr_info("%s: Unable to clear HDCP DDC Failure\n", + __func__); + + /* Re-Enable HDCP DDC */ + hdmi_write(hdmi, REG_HDMI_HDCP_DDC_CTRL_0, 0); + } + + if (nack0) { + DBG("Before: HDMI_DDC_SW_STATUS=0x%08x", + hdmi_read(hdmi, REG_HDMI_DDC_SW_STATUS)); + /* Reset HDMI DDC software status */ + reg_val = hdmi_read(hdmi, REG_HDMI_DDC_CTRL); + reg_val |= HDMI_DDC_CTRL_SW_STATUS_RESET; + hdmi_write(hdmi, REG_HDMI_DDC_CTRL, reg_val); + + rc = hdmi_hdcp_msleep(hdcp_ctrl, 20, AUTH_ABORT_EV); + + reg_val = hdmi_read(hdmi, REG_HDMI_DDC_CTRL); + reg_val &= ~HDMI_DDC_CTRL_SW_STATUS_RESET; + hdmi_write(hdmi, REG_HDMI_DDC_CTRL, reg_val); + + /* Reset HDMI DDC Controller */ + reg_val = hdmi_read(hdmi, REG_HDMI_DDC_CTRL); + reg_val |= HDMI_DDC_CTRL_SOFT_RESET; + hdmi_write(hdmi, REG_HDMI_DDC_CTRL, reg_val); + + /* If previous msleep is aborted, skip this msleep */ + if (!rc) + rc = hdmi_hdcp_msleep(hdcp_ctrl, 20, AUTH_ABORT_EV); + + reg_val = hdmi_read(hdmi, REG_HDMI_DDC_CTRL); + reg_val &= ~HDMI_DDC_CTRL_SOFT_RESET; + hdmi_write(hdmi, REG_HDMI_DDC_CTRL, reg_val); + DBG("After: HDMI_DDC_SW_STATUS=0x%08x", + hdmi_read(hdmi, REG_HDMI_DDC_SW_STATUS)); + } + + return rc; +} + +static int hdmi_hdcp_hw_ddc_clean(struct hdmi_hdcp_ctrl *hdcp_ctrl) +{ + int rc; + u32 hdcp_ddc_status, ddc_hw_status; + u32 xfer_done, xfer_req, hw_done; + bool hw_not_ready; + u32 timeout_count; + struct hdmi *hdmi = hdcp_ctrl->hdmi; + + if (hdmi_read(hdmi, REG_HDMI_DDC_HW_STATUS) == 0) + return 0; + + /* Wait to be clean on DDC HW engine */ + timeout_count = 100; + do { + hdcp_ddc_status = hdmi_read(hdmi, REG_HDMI_HDCP_DDC_STATUS); + ddc_hw_status = hdmi_read(hdmi, REG_HDMI_DDC_HW_STATUS); + + xfer_done = hdcp_ddc_status & HDMI_HDCP_DDC_STATUS_XFER_DONE; + xfer_req = hdcp_ddc_status & HDMI_HDCP_DDC_STATUS_XFER_REQ; + hw_done = ddc_hw_status & HDMI_DDC_HW_STATUS_DONE; + hw_not_ready = !xfer_done || xfer_req || !hw_done; + + if (hw_not_ready) + break; + + timeout_count--; + if (!timeout_count) { + pr_warn("%s: hw_ddc_clean failed\n", __func__); + return -ETIMEDOUT; + } + + rc = hdmi_hdcp_msleep(hdcp_ctrl, 20, AUTH_ABORT_EV); + if (rc) + return rc; + } while (1); + + return 0; +} + +static void hdmi_hdcp_reauth_work(struct work_struct *work) +{ + struct hdmi_hdcp_ctrl *hdcp_ctrl = container_of(work, + struct hdmi_hdcp_ctrl, hdcp_reauth_work); + struct hdmi *hdmi = hdcp_ctrl->hdmi; + unsigned long flags; + u32 reg_val; + + DBG("HDCP REAUTH WORK"); + /* + * Disable HPD circuitry. + * This is needed to reset the HDCP cipher engine so that when we + * attempt a re-authentication, HW would clear the AN0_READY and + * AN1_READY bits in HDMI_HDCP_LINK0_STATUS register + */ + spin_lock_irqsave(&hdmi->reg_lock, flags); + reg_val = hdmi_read(hdmi, REG_HDMI_HPD_CTRL); + reg_val &= ~HDMI_HPD_CTRL_ENABLE; + hdmi_write(hdmi, REG_HDMI_HPD_CTRL, reg_val); + + /* Disable HDCP interrupts */ + hdmi_write(hdmi, REG_HDMI_HDCP_INT_CTRL, 0); + spin_unlock_irqrestore(&hdmi->reg_lock, flags); + + hdmi_write(hdmi, REG_HDMI_HDCP_RESET, + HDMI_HDCP_RESET_LINK0_DEAUTHENTICATE); + + /* Wait to be clean on DDC HW engine */ + if (hdmi_hdcp_hw_ddc_clean(hdcp_ctrl)) { + pr_info("%s: reauth work aborted\n", __func__); + return; + } + + /* Disable encryption and disable the HDCP block */ + hdmi_write(hdmi, REG_HDMI_HDCP_CTRL, 0); + + /* Enable HPD circuitry */ + spin_lock_irqsave(&hdmi->reg_lock, flags); + reg_val = hdmi_read(hdmi, REG_HDMI_HPD_CTRL); + reg_val |= HDMI_HPD_CTRL_ENABLE; + hdmi_write(hdmi, REG_HDMI_HPD_CTRL, reg_val); + spin_unlock_irqrestore(&hdmi->reg_lock, flags); + + /* + * Only retry defined times then abort current authenticating process + */ + if (++hdcp_ctrl->auth_retries == AUTH_RETRIES_TIME) { + hdcp_ctrl->hdcp_state = HDCP_STATE_INACTIVE; + hdcp_ctrl->auth_retries = 0; + pr_info("%s: abort reauthentication!\n", __func__); + + return; + } + + DBG("Queue AUTH WORK"); + hdcp_ctrl->hdcp_state = HDCP_STATE_AUTHENTICATING; + queue_work(hdmi->workq, &hdcp_ctrl->hdcp_auth_work); +} + +static int hdmi_hdcp_auth_prepare(struct hdmi_hdcp_ctrl *hdcp_ctrl) +{ + struct hdmi *hdmi = hdcp_ctrl->hdmi; + u32 link0_status; + u32 reg_val; + unsigned long flags; + int rc; + + if (!hdcp_ctrl->aksv_valid) { + rc = hdmi_hdcp_read_validate_aksv(hdcp_ctrl); + if (rc) { + pr_err("%s: ASKV validation failed\n", __func__); + hdcp_ctrl->hdcp_state = HDCP_STATE_NO_AKSV; + return -ENOTSUPP; + } + hdcp_ctrl->aksv_valid = true; + } + + spin_lock_irqsave(&hdmi->reg_lock, flags); + /* disable HDMI Encrypt */ + reg_val = hdmi_read(hdmi, REG_HDMI_CTRL); + reg_val &= ~HDMI_CTRL_ENCRYPTED; + hdmi_write(hdmi, REG_HDMI_CTRL, reg_val); + + /* Enabling Software DDC */ + reg_val = hdmi_read(hdmi, REG_HDMI_DDC_ARBITRATION); + reg_val &= ~HDMI_DDC_ARBITRATION_HW_ARBITRATION; + hdmi_write(hdmi, REG_HDMI_DDC_ARBITRATION, reg_val); + spin_unlock_irqrestore(&hdmi->reg_lock, flags); + + /* + * Write AKSV read from QFPROM to the HDCP registers. + * This step is needed for HDCP authentication and must be + * written before enabling HDCP. + */ + hdmi_write(hdmi, REG_HDMI_HDCP_SW_LOWER_AKSV, hdcp_ctrl->aksv_lsb); + hdmi_write(hdmi, REG_HDMI_HDCP_SW_UPPER_AKSV, hdcp_ctrl->aksv_msb); + + /* + * HDCP setup prior to enabling HDCP_CTRL. + * Setup seed values for random number An. + */ + hdmi_write(hdmi, REG_HDMI_HDCP_ENTROPY_CTRL0, 0xB1FFB0FF); + hdmi_write(hdmi, REG_HDMI_HDCP_ENTROPY_CTRL1, 0xF00DFACE); + + /* Disable the RngCipher state */ + reg_val = hdmi_read(hdmi, REG_HDMI_HDCP_DEBUG_CTRL); + reg_val &= ~HDMI_HDCP_DEBUG_CTRL_RNG_CIPHER; + hdmi_write(hdmi, REG_HDMI_HDCP_DEBUG_CTRL, reg_val); + DBG("HDCP_DEBUG_CTRL=0x%08x", + hdmi_read(hdmi, REG_HDMI_HDCP_DEBUG_CTRL)); + + /* + * Ensure that all register writes are completed before + * enabling HDCP cipher + */ + wmb(); + + /* + * Enable HDCP + * This needs to be done as early as possible in order for the + * hardware to make An available to read + */ + hdmi_write(hdmi, REG_HDMI_HDCP_CTRL, HDMI_HDCP_CTRL_ENABLE); + + /* + * If we had stale values for the An ready bit, it should most + * likely be cleared now after enabling HDCP cipher + */ + link0_status = hdmi_read(hdmi, REG_HDMI_HDCP_LINK0_STATUS); + DBG("After enabling HDCP Link0_Status=0x%08x", link0_status); + if (!(link0_status & + (HDMI_HDCP_LINK0_STATUS_AN_0_READY | + HDMI_HDCP_LINK0_STATUS_AN_1_READY))) + DBG("An not ready after enabling HDCP"); + + /* Clear any DDC failures from previous tries before enable HDCP*/ + rc = reset_hdcp_ddc_failures(hdcp_ctrl); + + return rc; +} + +static void hdmi_hdcp_auth_fail(struct hdmi_hdcp_ctrl *hdcp_ctrl) +{ + struct hdmi *hdmi = hdcp_ctrl->hdmi; + u32 reg_val; + unsigned long flags; + + DBG("hdcp auth failed, queue reauth work"); + /* clear HDMI Encrypt */ + spin_lock_irqsave(&hdmi->reg_lock, flags); + reg_val = hdmi_read(hdmi, REG_HDMI_CTRL); + reg_val &= ~HDMI_CTRL_ENCRYPTED; + hdmi_write(hdmi, REG_HDMI_CTRL, reg_val); + spin_unlock_irqrestore(&hdmi->reg_lock, flags); + + hdcp_ctrl->hdcp_state = HDCP_STATE_AUTH_FAILED; + queue_work(hdmi->workq, &hdcp_ctrl->hdcp_reauth_work); +} + +static void hdmi_hdcp_auth_done(struct hdmi_hdcp_ctrl *hdcp_ctrl) +{ + struct hdmi *hdmi = hdcp_ctrl->hdmi; + u32 reg_val; + unsigned long flags; + + /* + * Disable software DDC before going into part3 to make sure + * there is no Arbitration between software and hardware for DDC + */ + spin_lock_irqsave(&hdmi->reg_lock, flags); + reg_val = hdmi_read(hdmi, REG_HDMI_DDC_ARBITRATION); + reg_val |= HDMI_DDC_ARBITRATION_HW_ARBITRATION; + hdmi_write(hdmi, REG_HDMI_DDC_ARBITRATION, reg_val); + spin_unlock_irqrestore(&hdmi->reg_lock, flags); + + /* enable HDMI Encrypt */ + spin_lock_irqsave(&hdmi->reg_lock, flags); + reg_val = hdmi_read(hdmi, REG_HDMI_CTRL); + reg_val |= HDMI_CTRL_ENCRYPTED; + hdmi_write(hdmi, REG_HDMI_CTRL, reg_val); + spin_unlock_irqrestore(&hdmi->reg_lock, flags); + + hdcp_ctrl->hdcp_state = HDCP_STATE_AUTHENTICATED; + hdcp_ctrl->auth_retries = 0; +} + +/* + * hdcp authenticating part 1 + * Wait Key/An ready + * Read BCAPS from sink + * Write BCAPS and AKSV into HDCP engine + * Write An and AKSV to sink + * Read BKSV from sink and write into HDCP engine + */ +static int hdmi_hdcp_wait_key_an_ready(struct hdmi_hdcp_ctrl *hdcp_ctrl) +{ + int rc; + struct hdmi *hdmi = hdcp_ctrl->hdmi; + u32 link0_status, keys_state; + u32 timeout_count; + bool an_ready; + + /* Wait for HDCP keys to be checked and validated */ + timeout_count = 100; + do { + link0_status = hdmi_read(hdmi, REG_HDMI_HDCP_LINK0_STATUS); + keys_state = (link0_status >> 28) & 0x7; + if (keys_state == HDCP_KEYS_STATE_VALID) + break; + + DBG("Keys not ready(%d). s=%d, l0=%0x08x", + timeout_count, keys_state, link0_status); + + timeout_count--; + if (!timeout_count) { + pr_err("%s: Wait key state timedout", __func__); + return -ETIMEDOUT; + } + + rc = hdmi_hdcp_msleep(hdcp_ctrl, 20, AUTH_ABORT_EV); + if (rc) + return rc; + } while (1); + + timeout_count = 100; + do { + link0_status = hdmi_read(hdmi, REG_HDMI_HDCP_LINK0_STATUS); + an_ready = (link0_status & HDMI_HDCP_LINK0_STATUS_AN_0_READY) + && (link0_status & HDMI_HDCP_LINK0_STATUS_AN_1_READY); + if (an_ready) + break; + + DBG("An not ready(%d). l0_status=0x%08x", + timeout_count, link0_status); + + timeout_count--; + if (!timeout_count) { + pr_err("%s: Wait An timedout", __func__); + return -ETIMEDOUT; + } + + rc = hdmi_hdcp_msleep(hdcp_ctrl, 20, AUTH_ABORT_EV); + if (rc) + return rc; + } while (1); + + return 0; +} + +static int hdmi_hdcp_send_aksv_an(struct hdmi_hdcp_ctrl *hdcp_ctrl) +{ + int rc = 0; + struct hdmi *hdmi = hdcp_ctrl->hdmi; + u32 link0_aksv_0, link0_aksv_1; + u32 link0_an[2]; + u8 aksv[5]; + + /* Read An0 and An1 */ + link0_an[0] = hdmi_read(hdmi, REG_HDMI_HDCP_RCVPORT_DATA5); + link0_an[1] = hdmi_read(hdmi, REG_HDMI_HDCP_RCVPORT_DATA6); + + /* Read AKSV */ + link0_aksv_0 = hdmi_read(hdmi, REG_HDMI_HDCP_RCVPORT_DATA3); + link0_aksv_1 = hdmi_read(hdmi, REG_HDMI_HDCP_RCVPORT_DATA4); + + DBG("Link ASKV=%08x%08x", link0_aksv_0, link0_aksv_1); + /* Copy An and AKSV to byte arrays for transmission */ + aksv[0] = link0_aksv_0 & 0xFF; + aksv[1] = (link0_aksv_0 >> 8) & 0xFF; + aksv[2] = (link0_aksv_0 >> 16) & 0xFF; + aksv[3] = (link0_aksv_0 >> 24) & 0xFF; + aksv[4] = link0_aksv_1 & 0xFF; + + /* Write An to offset 0x18 */ + rc = hdmi_ddc_write(hdmi, HDCP_PORT_ADDR, 0x18, (u8 *)link0_an, + (u16)sizeof(link0_an)); + if (rc) { + pr_err("%s:An write failed\n", __func__); + return rc; + } + DBG("Link0-An=%08x%08x", link0_an[0], link0_an[1]); + + /* Write AKSV to offset 0x10 */ + rc = hdmi_ddc_write(hdmi, HDCP_PORT_ADDR, 0x10, aksv, 5); + if (rc) { + pr_err("%s:AKSV write failed\n", __func__); + return rc; + } + DBG("Link0-AKSV=%02x%08x", link0_aksv_1 & 0xFF, link0_aksv_0); + + return 0; +} + +static int hdmi_hdcp_recv_bksv(struct hdmi_hdcp_ctrl *hdcp_ctrl) +{ + int rc = 0; + struct hdmi *hdmi = hdcp_ctrl->hdmi; + u8 bksv[5]; + u32 reg[2], data[2]; + + /* Read BKSV at offset 0x00 */ + rc = hdmi_ddc_read(hdmi, HDCP_PORT_ADDR, 0x00, bksv, 5); + if (rc) { + pr_err("%s:BKSV read failed\n", __func__); + return rc; + } + + hdcp_ctrl->bksv_lsb = bksv[0] | (bksv[1] << 8) | + (bksv[2] << 16) | (bksv[3] << 24); + hdcp_ctrl->bksv_msb = bksv[4]; + DBG(":BKSV=%02x%08x", hdcp_ctrl->bksv_msb, hdcp_ctrl->bksv_lsb); + + /* check there are 20 ones in BKSV */ + if ((hweight32(hdcp_ctrl->bksv_lsb) + hweight32(hdcp_ctrl->bksv_msb)) + != 20) { + pr_err(": BKSV doesn't have 20 1's and 20 0's\n"); + pr_err(": BKSV chk fail. BKSV=%02x%02x%02x%02x%02x\n", + bksv[4], bksv[3], bksv[2], bksv[1], bksv[0]); + return -EINVAL; + } + + /* Write BKSV read from sink to HDCP registers */ + reg[0] = REG_HDMI_HDCP_RCVPORT_DATA0; + data[0] = hdcp_ctrl->bksv_lsb; + reg[1] = REG_HDMI_HDCP_RCVPORT_DATA1; + data[1] = hdcp_ctrl->bksv_msb; + rc = hdmi_hdcp_scm_wr(hdcp_ctrl, reg, data, 2); + + return rc; +} + +static int hdmi_hdcp_recv_bcaps(struct hdmi_hdcp_ctrl *hdcp_ctrl) +{ + int rc = 0; + struct hdmi *hdmi = hdcp_ctrl->hdmi; + u32 reg, data; + u8 bcaps; + + rc = hdmi_ddc_read(hdmi, HDCP_PORT_ADDR, 0x40, &bcaps, 1); + if (rc) { + pr_err("%s:BCAPS read failed\n", __func__); + return rc; + } + DBG("BCAPS=%02x", bcaps); + + /* receiver (0), repeater (1) */ + hdcp_ctrl->ds_type = (bcaps & BIT(6)) ? DS_REPEATER : DS_RECEIVER; + + /* Write BCAPS to the hardware */ + reg = REG_HDMI_HDCP_RCVPORT_DATA12; + data = (u32)bcaps; + rc = hdmi_hdcp_scm_wr(hdcp_ctrl, ®, &data, 1); + + return rc; +} + +static int hdmi_hdcp_auth_part1_key_exchange(struct hdmi_hdcp_ctrl *hdcp_ctrl) +{ + struct hdmi *hdmi = hdcp_ctrl->hdmi; + unsigned long flags; + int rc; + + /* Wait for AKSV key and An ready */ + rc = hdmi_hdcp_wait_key_an_ready(hdcp_ctrl); + if (rc) { + pr_err("%s: wait key and an ready failed\n", __func__); + return rc; + }; + + /* Read BCAPS and send to HDCP engine */ + rc = hdmi_hdcp_recv_bcaps(hdcp_ctrl); + if (rc) { + pr_err("%s: read bcaps error, abort\n", __func__); + return rc; + } + + /* + * 1.1_Features turned off by default. + * No need to write AInfo since 1.1_Features is disabled. + */ + hdmi_write(hdmi, REG_HDMI_HDCP_RCVPORT_DATA4, 0); + + /* Send AKSV and An to sink */ + rc = hdmi_hdcp_send_aksv_an(hdcp_ctrl); + if (rc) { + pr_err("%s:An/Aksv write failed\n", __func__); + return rc; + } + + /* Read BKSV and send to HDCP engine*/ + rc = hdmi_hdcp_recv_bksv(hdcp_ctrl); + if (rc) { + pr_err("%s:BKSV Process failed\n", __func__); + return rc; + } + + /* Enable HDCP interrupts and ack/clear any stale interrupts */ + spin_lock_irqsave(&hdmi->reg_lock, flags); + hdmi_write(hdmi, REG_HDMI_HDCP_INT_CTRL, + HDMI_HDCP_INT_CTRL_AUTH_SUCCESS_ACK | + HDMI_HDCP_INT_CTRL_AUTH_SUCCESS_MASK | + HDMI_HDCP_INT_CTRL_AUTH_FAIL_ACK | + HDMI_HDCP_INT_CTRL_AUTH_FAIL_MASK | + HDMI_HDCP_INT_CTRL_AUTH_FAIL_INFO_ACK); + spin_unlock_irqrestore(&hdmi->reg_lock, flags); + + return 0; +} + +/* read R0' from sink and pass it to HDCP engine */ +static int hdmi_hdcp_auth_part1_recv_r0(struct hdmi_hdcp_ctrl *hdcp_ctrl) +{ + struct hdmi *hdmi = hdcp_ctrl->hdmi; + int rc = 0; + u8 buf[2]; + + /* + * HDCP Compliance Test case 1A-01: + * Wait here at least 100ms before reading R0' + */ + rc = hdmi_hdcp_msleep(hdcp_ctrl, 125, AUTH_ABORT_EV); + if (rc) + return rc; + + /* Read R0' at offset 0x08 */ + rc = hdmi_ddc_read(hdmi, HDCP_PORT_ADDR, 0x08, buf, 2); + if (rc) { + pr_err("%s:R0' read failed\n", __func__); + return rc; + } + DBG("R0'=%02x%02x", buf[1], buf[0]); + + /* Write R0' to HDCP registers and check to see if it is a match */ + hdmi_write(hdmi, REG_HDMI_HDCP_RCVPORT_DATA2_0, + (((u32)buf[1]) << 8) | buf[0]); + + return 0; +} + +/* Wait for authenticating result: R0/R0' are matched or not */ +static int hdmi_hdcp_auth_part1_verify_r0(struct hdmi_hdcp_ctrl *hdcp_ctrl) +{ + struct hdmi *hdmi = hdcp_ctrl->hdmi; + u32 link0_status; + int rc; + + /* wait for hdcp irq, 10 sec should be long enough */ + rc = hdmi_hdcp_msleep(hdcp_ctrl, 10000, AUTH_RESULT_RDY_EV); + if (!rc) { + pr_err("%s: Wait Auth IRQ timeout\n", __func__); + return -ETIMEDOUT; + } + + link0_status = hdmi_read(hdmi, REG_HDMI_HDCP_LINK0_STATUS); + if (!(link0_status & HDMI_HDCP_LINK0_STATUS_RI_MATCHES)) { + pr_err("%s: Authentication Part I failed\n", __func__); + return -EINVAL; + } + + /* Enable HDCP Encryption */ + hdmi_write(hdmi, REG_HDMI_HDCP_CTRL, + HDMI_HDCP_CTRL_ENABLE | + HDMI_HDCP_CTRL_ENCRYPTION_ENABLE); + + return 0; +} + +static int hdmi_hdcp_recv_check_bstatus(struct hdmi_hdcp_ctrl *hdcp_ctrl, + u16 *pbstatus) +{ + int rc; + struct hdmi *hdmi = hdcp_ctrl->hdmi; + bool max_devs_exceeded = false, max_cascade_exceeded = false; + u32 repeater_cascade_depth = 0, down_stream_devices = 0; + u16 bstatus; + u8 buf[2]; + + /* Read BSTATUS at offset 0x41 */ + rc = hdmi_ddc_read(hdmi, HDCP_PORT_ADDR, 0x41, buf, 2); + if (rc) { + pr_err("%s: BSTATUS read failed\n", __func__); + goto error; + } + *pbstatus = bstatus = (buf[1] << 8) | buf[0]; + + + down_stream_devices = bstatus & 0x7F; + repeater_cascade_depth = (bstatus >> 8) & 0x7; + max_devs_exceeded = (bstatus & BIT(7)) ? true : false; + max_cascade_exceeded = (bstatus & BIT(11)) ? true : false; + + if (down_stream_devices == 0) { + /* + * If no downstream devices are attached to the repeater + * then part II fails. + * todo: The other approach would be to continue PART II. + */ + pr_err("%s: No downstream devices\n", __func__); + rc = -EINVAL; + goto error; + } + + /* + * HDCP Compliance 1B-05: + * Check if no. of devices connected to repeater + * exceed max_devices_connected from bit 7 of Bstatus. + */ + if (max_devs_exceeded) { + pr_err("%s: no. of devs connected exceeds max allowed", + __func__); + rc = -EINVAL; + goto error; + } + + /* + * HDCP Compliance 1B-06: + * Check if no. of cascade connected to repeater + * exceed max_cascade_connected from bit 11 of Bstatus. + */ + if (max_cascade_exceeded) { + pr_err("%s: no. of cascade conn exceeds max allowed", + __func__); + rc = -EINVAL; + goto error; + } + +error: + hdcp_ctrl->dev_count = down_stream_devices; + hdcp_ctrl->max_cascade_exceeded = max_cascade_exceeded; + hdcp_ctrl->max_dev_exceeded = max_devs_exceeded; + hdcp_ctrl->depth = repeater_cascade_depth; + return rc; +} + +static int hdmi_hdcp_auth_part2_wait_ksv_fifo_ready( + struct hdmi_hdcp_ctrl *hdcp_ctrl) +{ + int rc; + struct hdmi *hdmi = hdcp_ctrl->hdmi; + u32 reg, data; + u32 timeout_count; + u16 bstatus; + u8 bcaps; + + /* + * Wait until READY bit is set in BCAPS, as per HDCP specifications + * maximum permitted time to check for READY bit is five seconds. + */ + timeout_count = 100; + do { + /* Read BCAPS at offset 0x40 */ + rc = hdmi_ddc_read(hdmi, HDCP_PORT_ADDR, 0x40, &bcaps, 1); + if (rc) { + pr_err("%s: BCAPS read failed\n", __func__); + return rc; + } + + if (bcaps & BIT(5)) + break; + + timeout_count--; + if (!timeout_count) { + pr_err("%s: Wait KSV fifo ready timedout", __func__); + return -ETIMEDOUT; + } + + rc = hdmi_hdcp_msleep(hdcp_ctrl, 20, AUTH_ABORT_EV); + if (rc) + return rc; + } while (1); + + rc = hdmi_hdcp_recv_check_bstatus(hdcp_ctrl, &bstatus); + if (rc) { + pr_err("%s: bstatus error\n", __func__); + return rc; + } + + /* Write BSTATUS and BCAPS to HDCP registers */ + reg = REG_HDMI_HDCP_RCVPORT_DATA12; + data = bcaps | (bstatus << 8); + rc = hdmi_hdcp_scm_wr(hdcp_ctrl, ®, &data, 1); + if (rc) { + pr_err("%s: BSTATUS write failed\n", __func__); + return rc; + } + + return 0; +} + +/* + * hdcp authenticating part 2: 2nd + * read ksv fifo from sink + * transfer V' from sink to HDCP engine + * reset SHA engine + */ +static int hdmi_hdcp_transfer_v_h(struct hdmi_hdcp_ctrl *hdcp_ctrl) +{ + struct hdmi *hdmi = hdcp_ctrl->hdmi; + int rc = 0; + struct hdmi_hdcp_reg_data reg_data[] = { + {REG_HDMI_HDCP_RCVPORT_DATA7, 0x20, "V' H0"}, + {REG_HDMI_HDCP_RCVPORT_DATA8, 0x24, "V' H1"}, + {REG_HDMI_HDCP_RCVPORT_DATA9, 0x28, "V' H2"}, + {REG_HDMI_HDCP_RCVPORT_DATA10, 0x2C, "V' H3"}, + {REG_HDMI_HDCP_RCVPORT_DATA11, 0x30, "V' H4"}, + }; + struct hdmi_hdcp_reg_data *rd; + u32 size = ARRAY_SIZE(reg_data); + u32 reg[ARRAY_SIZE(reg_data)]; + u32 data[ARRAY_SIZE(reg_data)]; + int i; + + for (i = 0; i < size; i++) { + rd = ®_data[i]; + rc = hdmi_ddc_read(hdmi, HDCP_PORT_ADDR, + rd->off, (u8 *)&data[i], (u16)sizeof(data[i])); + if (rc) { + pr_err("%s: Read %s failed\n", __func__, rd->name); + goto error; + } + + DBG("%s =%x", rd->name, data[i]); + reg[i] = reg_data[i].reg_id; + } + + rc = hdmi_hdcp_scm_wr(hdcp_ctrl, reg, data, size); + +error: + return rc; +} + +static int hdmi_hdcp_recv_ksv_fifo(struct hdmi_hdcp_ctrl *hdcp_ctrl) +{ + int rc; + struct hdmi *hdmi = hdcp_ctrl->hdmi; + u32 ksv_bytes; + + ksv_bytes = 5 * hdcp_ctrl->dev_count; + + rc = hdmi_ddc_read(hdmi, HDCP_PORT_ADDR, 0x43, + hdcp_ctrl->ksv_list, ksv_bytes); + if (rc) + pr_err("%s: KSV FIFO read failed\n", __func__); + + return rc; +} + +static int hdmi_hdcp_reset_sha_engine(struct hdmi_hdcp_ctrl *hdcp_ctrl) +{ + u32 reg[2], data[2]; + u32 rc = 0; + + reg[0] = REG_HDMI_HDCP_SHA_CTRL; + data[0] = HDCP_REG_ENABLE; + reg[1] = REG_HDMI_HDCP_SHA_CTRL; + data[1] = HDCP_REG_DISABLE; + + rc = hdmi_hdcp_scm_wr(hdcp_ctrl, reg, data, 2); + + return rc; +} + +static int hdmi_hdcp_auth_part2_recv_ksv_fifo( + struct hdmi_hdcp_ctrl *hdcp_ctrl) +{ + int rc; + u32 timeout_count; + + /* + * Read KSV FIFO over DDC + * Key Selection vector FIFO Used to pull downstream KSVs + * from HDCP Repeaters. + * All bytes (DEVICE_COUNT * 5) must be read in a single, + * auto incrementing access. + * All bytes read as 0x00 for HDCP Receivers that are not + * HDCP Repeaters (REPEATER == 0). + */ + timeout_count = 100; + do { + rc = hdmi_hdcp_recv_ksv_fifo(hdcp_ctrl); + if (!rc) + break; + + timeout_count--; + if (!timeout_count) { + pr_err("%s: Recv ksv fifo timedout", __func__); + return -ETIMEDOUT; + } + + rc = hdmi_hdcp_msleep(hdcp_ctrl, 25, AUTH_ABORT_EV); + if (rc) + return rc; + } while (1); + + rc = hdmi_hdcp_transfer_v_h(hdcp_ctrl); + if (rc) { + pr_err("%s: transfer V failed\n", __func__); + return rc; + } + + /* reset SHA engine before write ksv fifo */ + rc = hdmi_hdcp_reset_sha_engine(hdcp_ctrl); + if (rc) { + pr_err("%s: fail to reset sha engine\n", __func__); + return rc; + } + + return 0; +} + +/* + * Write KSV FIFO to HDCP_SHA_DATA. + * This is done 1 byte at time starting with the LSB. + * Once 64 bytes have been written, we need to poll for + * HDCP_SHA_BLOCK_DONE before writing any further + * If the last byte is written, we need to poll for + * HDCP_SHA_COMP_DONE to wait until HW finish + */ +static int hdmi_hdcp_write_ksv_fifo(struct hdmi_hdcp_ctrl *hdcp_ctrl) +{ + int i; + struct hdmi *hdmi = hdcp_ctrl->hdmi; + u32 ksv_bytes, last_byte = 0; + u8 *ksv_fifo = NULL; + u32 reg_val, data, reg; + u32 rc = 0; + + ksv_bytes = 5 * hdcp_ctrl->dev_count; + + /* Check if need to wait for HW completion */ + if (hdcp_ctrl->ksv_fifo_w_index) { + reg_val = hdmi_read(hdmi, REG_HDMI_HDCP_SHA_STATUS); + DBG("HDCP_SHA_STATUS=%08x", reg_val); + if (hdcp_ctrl->ksv_fifo_w_index == ksv_bytes) { + /* check COMP_DONE if last write */ + if (reg_val & HDMI_HDCP_SHA_STATUS_COMP_DONE) { + DBG("COMP_DONE"); + return 0; + } else { + return -EAGAIN; + } + } else { + /* check BLOCK_DONE if not last write */ + if (!(reg_val & HDMI_HDCP_SHA_STATUS_BLOCK_DONE)) + return -EAGAIN; + + DBG("BLOCK_DONE"); + } + } + + ksv_bytes -= hdcp_ctrl->ksv_fifo_w_index; + if (ksv_bytes <= 64) + last_byte = 1; + else + ksv_bytes = 64; + + ksv_fifo = hdcp_ctrl->ksv_list; + ksv_fifo += hdcp_ctrl->ksv_fifo_w_index; + + for (i = 0; i < ksv_bytes; i++) { + /* Write KSV byte and set DONE bit[0] for last byte*/ + reg_val = ksv_fifo[i] << 16; + if ((i == (ksv_bytes - 1)) && last_byte) + reg_val |= HDMI_HDCP_SHA_DATA_DONE; + + reg = REG_HDMI_HDCP_SHA_DATA; + data = reg_val; + rc = hdmi_hdcp_scm_wr(hdcp_ctrl, ®, &data, 1); + + if (rc) + return rc; + } + + hdcp_ctrl->ksv_fifo_w_index += ksv_bytes; + + /* + *return -EAGAIN to notify caller to wait for COMP_DONE or BLOCK_DONE + */ + return -EAGAIN; +} + +/* write ksv fifo into HDCP engine */ +static int hdmi_hdcp_auth_part2_write_ksv_fifo( + struct hdmi_hdcp_ctrl *hdcp_ctrl) +{ + int rc; + u32 timeout_count; + + hdcp_ctrl->ksv_fifo_w_index = 0; + timeout_count = 100; + do { + rc = hdmi_hdcp_write_ksv_fifo(hdcp_ctrl); + if (!rc) + break; + + if (rc != -EAGAIN) + return rc; + + timeout_count--; + if (!timeout_count) { + pr_err("%s: Write KSV fifo timedout", __func__); + return -ETIMEDOUT; + } + + rc = hdmi_hdcp_msleep(hdcp_ctrl, 20, AUTH_ABORT_EV); + if (rc) + return rc; + } while (1); + + return 0; +} + +static int hdmi_hdcp_auth_part2_check_v_match(struct hdmi_hdcp_ctrl *hdcp_ctrl) +{ + int rc = 0; + struct hdmi *hdmi = hdcp_ctrl->hdmi; + u32 link0_status; + u32 timeout_count = 100; + + do { + link0_status = hdmi_read(hdmi, REG_HDMI_HDCP_LINK0_STATUS); + if (link0_status & HDMI_HDCP_LINK0_STATUS_V_MATCHES) + break; + + timeout_count--; + if (!timeout_count) { + pr_err("%s: HDCP V Match timedout", __func__); + return -ETIMEDOUT; + } + + rc = hdmi_hdcp_msleep(hdcp_ctrl, 20, AUTH_ABORT_EV); + if (rc) + return rc; + } while (1); + + return 0; +} + +static void hdmi_hdcp_auth_work(struct work_struct *work) +{ + struct hdmi_hdcp_ctrl *hdcp_ctrl = container_of(work, + struct hdmi_hdcp_ctrl, hdcp_auth_work); + int rc; + + rc = hdmi_hdcp_auth_prepare(hdcp_ctrl); + if (rc) { + pr_err("%s: auth prepare failed %d\n", __func__, rc); + goto end; + } + + /* HDCP PartI */ + rc = hdmi_hdcp_auth_part1_key_exchange(hdcp_ctrl); + if (rc) { + pr_err("%s: key exchange failed %d\n", __func__, rc); + goto end; + } + + rc = hdmi_hdcp_auth_part1_recv_r0(hdcp_ctrl); + if (rc) { + pr_err("%s: receive r0 failed %d\n", __func__, rc); + goto end; + } + + rc = hdmi_hdcp_auth_part1_verify_r0(hdcp_ctrl); + if (rc) { + pr_err("%s: verify r0 failed %d\n", __func__, rc); + goto end; + } + pr_info("%s: Authentication Part I successful\n", __func__); + if (hdcp_ctrl->ds_type == DS_RECEIVER) + goto end; + + /* HDCP PartII */ + rc = hdmi_hdcp_auth_part2_wait_ksv_fifo_ready(hdcp_ctrl); + if (rc) { + pr_err("%s: wait ksv fifo ready failed %d\n", __func__, rc); + goto end; + } + + rc = hdmi_hdcp_auth_part2_recv_ksv_fifo(hdcp_ctrl); + if (rc) { + pr_err("%s: recv ksv fifo failed %d\n", __func__, rc); + goto end; + } + + rc = hdmi_hdcp_auth_part2_write_ksv_fifo(hdcp_ctrl); + if (rc) { + pr_err("%s: write ksv fifo failed %d\n", __func__, rc); + goto end; + } + + rc = hdmi_hdcp_auth_part2_check_v_match(hdcp_ctrl); + if (rc) + pr_err("%s: check v match failed %d\n", __func__, rc); + +end: + if (rc == -ECANCELED) { + pr_info("%s: hdcp authentication canceled\n", __func__); + } else if (rc == -ENOTSUPP) { + pr_info("%s: hdcp is not supported\n", __func__); + } else if (rc) { + pr_err("%s: hdcp authentication failed\n", __func__); + hdmi_hdcp_auth_fail(hdcp_ctrl); + } else { + hdmi_hdcp_auth_done(hdcp_ctrl); + } +} + +void hdmi_hdcp_on(struct hdmi_hdcp_ctrl *hdcp_ctrl) +{ + struct hdmi *hdmi = hdcp_ctrl->hdmi; + u32 reg_val; + unsigned long flags; + + if ((HDCP_STATE_INACTIVE != hdcp_ctrl->hdcp_state) || + (HDCP_STATE_NO_AKSV == hdcp_ctrl->hdcp_state)) { + DBG("still active or activating or no askv. returning"); + return; + } + + /* clear HDMI Encrypt */ + spin_lock_irqsave(&hdmi->reg_lock, flags); + reg_val = hdmi_read(hdmi, REG_HDMI_CTRL); + reg_val &= ~HDMI_CTRL_ENCRYPTED; + hdmi_write(hdmi, REG_HDMI_CTRL, reg_val); + spin_unlock_irqrestore(&hdmi->reg_lock, flags); + + hdcp_ctrl->auth_event = 0; + hdcp_ctrl->hdcp_state = HDCP_STATE_AUTHENTICATING; + hdcp_ctrl->auth_retries = 0; + queue_work(hdmi->workq, &hdcp_ctrl->hdcp_auth_work); +} + +void hdmi_hdcp_off(struct hdmi_hdcp_ctrl *hdcp_ctrl) +{ + struct hdmi *hdmi = hdcp_ctrl->hdmi; + unsigned long flags; + u32 reg_val; + + if ((HDCP_STATE_INACTIVE == hdcp_ctrl->hdcp_state) || + (HDCP_STATE_NO_AKSV == hdcp_ctrl->hdcp_state)) { + DBG("hdcp inactive or no aksv. returning"); + return; + } + + /* + * Disable HPD circuitry. + * This is needed to reset the HDCP cipher engine so that when we + * attempt a re-authentication, HW would clear the AN0_READY and + * AN1_READY bits in HDMI_HDCP_LINK0_STATUS register + */ + spin_lock_irqsave(&hdmi->reg_lock, flags); + reg_val = hdmi_read(hdmi, REG_HDMI_HPD_CTRL); + reg_val &= ~HDMI_HPD_CTRL_ENABLE; + hdmi_write(hdmi, REG_HDMI_HPD_CTRL, reg_val); + + /* + * Disable HDCP interrupts. + * Also, need to set the state to inactive here so that any ongoing + * reauth works will know that the HDCP session has been turned off. + */ + hdmi_write(hdmi, REG_HDMI_HDCP_INT_CTRL, 0); + spin_unlock_irqrestore(&hdmi->reg_lock, flags); + + /* + * Cancel any pending auth/reauth attempts. + * If one is ongoing, this will wait for it to finish. + * No more reauthentication attempts will be scheduled since we + * set the current state to inactive. + */ + set_bit(AUTH_ABORT_EV, &hdcp_ctrl->auth_event); + wake_up_all(&hdcp_ctrl->auth_event_queue); + cancel_work_sync(&hdcp_ctrl->hdcp_auth_work); + cancel_work_sync(&hdcp_ctrl->hdcp_reauth_work); + + hdmi_write(hdmi, REG_HDMI_HDCP_RESET, + HDMI_HDCP_RESET_LINK0_DEAUTHENTICATE); + + /* Disable encryption and disable the HDCP block */ + hdmi_write(hdmi, REG_HDMI_HDCP_CTRL, 0); + + spin_lock_irqsave(&hdmi->reg_lock, flags); + reg_val = hdmi_read(hdmi, REG_HDMI_CTRL); + reg_val &= ~HDMI_CTRL_ENCRYPTED; + hdmi_write(hdmi, REG_HDMI_CTRL, reg_val); + + /* Enable HPD circuitry */ + reg_val = hdmi_read(hdmi, REG_HDMI_HPD_CTRL); + reg_val |= HDMI_HPD_CTRL_ENABLE; + hdmi_write(hdmi, REG_HDMI_HPD_CTRL, reg_val); + spin_unlock_irqrestore(&hdmi->reg_lock, flags); + + hdcp_ctrl->hdcp_state = HDCP_STATE_INACTIVE; + + DBG("HDCP: Off"); +} + +struct hdmi_hdcp_ctrl *hdmi_hdcp_init(struct hdmi *hdmi) +{ + struct hdmi_hdcp_ctrl *hdcp_ctrl = NULL; + + if (!hdmi->qfprom_mmio) { + pr_err("%s: HDCP is not supported without qfprom\n", + __func__); + return ERR_PTR(-EINVAL); + } + + hdcp_ctrl = kzalloc(sizeof(*hdcp_ctrl), GFP_KERNEL); + if (!hdcp_ctrl) + return ERR_PTR(-ENOMEM); + + INIT_WORK(&hdcp_ctrl->hdcp_auth_work, hdmi_hdcp_auth_work); + INIT_WORK(&hdcp_ctrl->hdcp_reauth_work, hdmi_hdcp_reauth_work); + init_waitqueue_head(&hdcp_ctrl->auth_event_queue); + hdcp_ctrl->hdmi = hdmi; + hdcp_ctrl->hdcp_state = HDCP_STATE_INACTIVE; + hdcp_ctrl->aksv_valid = false; + + if (qcom_scm_hdcp_available()) + hdcp_ctrl->tz_hdcp = true; + else + hdcp_ctrl->tz_hdcp = false; + + return hdcp_ctrl; +} + +void hdmi_hdcp_destroy(struct hdmi *hdmi) +{ + if (hdmi && hdmi->hdcp_ctrl) { + kfree(hdmi->hdcp_ctrl); + hdmi->hdcp_ctrl = NULL; + } +} |