/*
 * Copyright © 2008 Keith Packard
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting documentation, and
 * that the name of the copyright holders not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  The copyright holders make no representations
 * about the suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 * OF THIS SOFTWARE.
 */

#ifndef _DRM_DP_HELPER_H_
#define _DRM_DP_HELPER_H_

/*
 * Unless otherwise noted, all values are from the DP 1.1a spec.  Note that
 * DP and DPCD versions are independent.  Differences from 1.0 are not noted,
 * 1.0 devices basically don't exist in the wild.
 *
 * Abbreviations, in chronological order:
 *
 * eDP: Embedded DisplayPort version 1
 * DPI: DisplayPort Interoperability Guideline v1.1a
 * 1.2: DisplayPort 1.2
 *
 * 1.2 formally includes both eDP and DPI definitions.
 */

#define AUX_NATIVE_WRITE        0x8
#define AUX_NATIVE_READ         0x9
#define AUX_I2C_WRITE           0x0
#define AUX_I2C_READ            0x1
#define AUX_I2C_STATUS          0x2
#define AUX_I2C_MOT             0x4

#define AUX_NATIVE_REPLY_ACK    (0x0 << 4)
#define AUX_NATIVE_REPLY_NACK   (0x1 << 4)
#define AUX_NATIVE_REPLY_DEFER  (0x2 << 4)
#define AUX_NATIVE_REPLY_MASK   (0x3 << 4)

#define AUX_I2C_REPLY_ACK       (0x0 << 6)
#define AUX_I2C_REPLY_NACK      (0x1 << 6)
#define AUX_I2C_REPLY_DEFER     (0x2 << 6)
#define AUX_I2C_REPLY_MASK      (0x3 << 6)

/* AUX CH addresses */
/* DPCD */
#define DP_DPCD_REV                         0x000

#define DP_MAX_LINK_RATE                    0x001

#define DP_MAX_LANE_COUNT                   0x002
# define DP_MAX_LANE_COUNT_MASK             0x1f
# define DP_TPS3_SUPPORTED                  (1 << 6) /* 1.2 */
# define DP_ENHANCED_FRAME_CAP              (1 << 7)

#define DP_MAX_DOWNSPREAD                   0x003
# define DP_NO_AUX_HANDSHAKE_LINK_TRAINING  (1 << 6)

#define DP_NORP                             0x004

#define DP_DOWNSTREAMPORT_PRESENT           0x005
# define DP_DWN_STRM_PORT_PRESENT           (1 << 0)
# define DP_DWN_STRM_PORT_TYPE_MASK         0x06
/* 00b = DisplayPort */
/* 01b = Analog */
/* 10b = TMDS or HDMI */
/* 11b = Other */
# define DP_FORMAT_CONVERSION               (1 << 3)
# define DP_DETAILED_CAP_INFO_AVAILABLE     (1 << 4) /* DPI */

#define DP_MAIN_LINK_CHANNEL_CODING         0x006

#define DP_DOWN_STREAM_PORT_COUNT           0x007
# define DP_PORT_COUNT_MASK                 0x0f
# define DP_MSA_TIMING_PAR_IGNORED          (1 << 6) /* eDP */
# define DP_OUI_SUPPORT                     (1 << 7)

#define DP_I2C_SPEED_CAP                    0x00c    /* DPI */
# define DP_I2C_SPEED_1K                    0x01
# define DP_I2C_SPEED_5K                    0x02
# define DP_I2C_SPEED_10K                   0x04
# define DP_I2C_SPEED_100K                  0x08
# define DP_I2C_SPEED_400K                  0x10
# define DP_I2C_SPEED_1M                    0x20

#define DP_EDP_CONFIGURATION_CAP            0x00d   /* XXX 1.2? */
#define DP_TRAINING_AUX_RD_INTERVAL         0x00e   /* XXX 1.2? */

/* Multiple stream transport */
#define DP_MSTM_CAP                         0x021   /* 1.2 */
# define DP_MST_CAP                         (1 << 0)

#define DP_PSR_SUPPORT                      0x070   /* XXX 1.2? */
# define DP_PSR_IS_SUPPORTED                1
#define DP_PSR_CAPS                         0x071   /* XXX 1.2? */
# define DP_PSR_NO_TRAIN_ON_EXIT            1
# define DP_PSR_SETUP_TIME_330              (0 << 1)
# define DP_PSR_SETUP_TIME_275              (1 << 1)
# define DP_PSR_SETUP_TIME_220              (2 << 1)
# define DP_PSR_SETUP_TIME_165              (3 << 1)
# define DP_PSR_SETUP_TIME_110              (4 << 1)
# define DP_PSR_SETUP_TIME_55               (5 << 1)
# define DP_PSR_SETUP_TIME_0                (6 << 1)
# define DP_PSR_SETUP_TIME_MASK             (7 << 1)
# define DP_PSR_SETUP_TIME_SHIFT            1

/*
 * 0x80-0x8f describe downstream port capabilities, but there are two layouts
 * based on whether DP_DETAILED_CAP_INFO_AVAILABLE was set.  If it was not,
 * each port's descriptor is one byte wide.  If it was set, each port's is
 * four bytes wide, starting with the one byte from the base info.  As of
 * DP interop v1.1a only VGA defines additional detail.
 */

/* offset 0 */
#define DP_DOWNSTREAM_PORT_0                0x80
# define DP_DS_PORT_TYPE_MASK               (7 << 0)
# define DP_DS_PORT_TYPE_DP                 0
# define DP_DS_PORT_TYPE_VGA                1
# define DP_DS_PORT_TYPE_DVI                2
# define DP_DS_PORT_TYPE_HDMI               3
# define DP_DS_PORT_TYPE_NON_EDID           4
# define DP_DS_PORT_HPD                     (1 << 3)
/* offset 1 for VGA is maximum megapixels per second / 8 */
/* offset 2 */
# define DP_DS_VGA_MAX_BPC_MASK             (3 << 0)
# define DP_DS_VGA_8BPC                     0
# define DP_DS_VGA_10BPC                    1
# define DP_DS_VGA_12BPC                    2
# define DP_DS_VGA_16BPC                    3

/* link configuration */
#define DP_LINK_BW_SET                      0x100
# define DP_LINK_BW_1_62                    0x06
# define DP_LINK_BW_2_7                     0x0a
# define DP_LINK_BW_5_4                     0x14    /* 1.2 */

#define DP_LANE_COUNT_SET                   0x101
# define DP_LANE_COUNT_MASK                 0x0f
# define DP_LANE_COUNT_ENHANCED_FRAME_EN    (1 << 7)

#define DP_TRAINING_PATTERN_SET             0x102
# define DP_TRAINING_PATTERN_DISABLE        0
# define DP_TRAINING_PATTERN_1              1
# define DP_TRAINING_PATTERN_2              2
# define DP_TRAINING_PATTERN_3              3       /* 1.2 */
# define DP_TRAINING_PATTERN_MASK           0x3

# define DP_LINK_QUAL_PATTERN_DISABLE       (0 << 2)
# define DP_LINK_QUAL_PATTERN_D10_2         (1 << 2)
# define DP_LINK_QUAL_PATTERN_ERROR_RATE    (2 << 2)
# define DP_LINK_QUAL_PATTERN_PRBS7         (3 << 2)
# define DP_LINK_QUAL_PATTERN_MASK          (3 << 2)

# define DP_RECOVERED_CLOCK_OUT_EN          (1 << 4)
# define DP_LINK_SCRAMBLING_DISABLE         (1 << 5)

# define DP_SYMBOL_ERROR_COUNT_BOTH         (0 << 6)
# define DP_SYMBOL_ERROR_COUNT_DISPARITY    (1 << 6)
# define DP_SYMBOL_ERROR_COUNT_SYMBOL       (2 << 6)
# define DP_SYMBOL_ERROR_COUNT_MASK         (3 << 6)

#define DP_TRAINING_LANE0_SET               0x103
#define DP_TRAINING_LANE1_SET               0x104
#define DP_TRAINING_LANE2_SET               0x105
#define DP_TRAINING_LANE3_SET               0x106

# define DP_TRAIN_VOLTAGE_SWING_MASK        0x3
# define DP_TRAIN_VOLTAGE_SWING_SHIFT       0
# define DP_TRAIN_MAX_SWING_REACHED         (1 << 2)
# define DP_TRAIN_VOLTAGE_SWING_400         (0 << 0)
# define DP_TRAIN_VOLTAGE_SWING_600         (1 << 0)
# define DP_TRAIN_VOLTAGE_SWING_800         (2 << 0)
# define DP_TRAIN_VOLTAGE_SWING_1200        (3 << 0)

# define DP_TRAIN_PRE_EMPHASIS_MASK         (3 << 3)
# define DP_TRAIN_PRE_EMPHASIS_0            (0 << 3)
# define DP_TRAIN_PRE_EMPHASIS_3_5          (1 << 3)
# define DP_TRAIN_PRE_EMPHASIS_6            (2 << 3)
# define DP_TRAIN_PRE_EMPHASIS_9_5          (3 << 3)

# define DP_TRAIN_PRE_EMPHASIS_SHIFT        3
# define DP_TRAIN_MAX_PRE_EMPHASIS_REACHED  (1 << 5)

#define DP_DOWNSPREAD_CTRL                  0x107
# define DP_SPREAD_AMP_0_5                  (1 << 4)
# define DP_MSA_TIMING_PAR_IGNORE_EN        (1 << 7) /* eDP */

#define DP_MAIN_LINK_CHANNEL_CODING_SET     0x108
# define DP_SET_ANSI_8B10B                  (1 << 0)

#define DP_I2C_SPEED_CONTROL_STATUS         0x109   /* DPI */
/* bitmask as for DP_I2C_SPEED_CAP */

#define DP_EDP_CONFIGURATION_SET            0x10a   /* XXX 1.2? */

#define DP_MSTM_CTRL                        0x111   /* 1.2 */
# define DP_MST_EN                          (1 << 0)
# define DP_UP_REQ_EN                       (1 << 1)
# define DP_UPSTREAM_IS_SRC                 (1 << 2)

#define DP_PSR_EN_CFG                       0x170   /* XXX 1.2? */
# define DP_PSR_ENABLE                      (1 << 0)
# define DP_PSR_MAIN_LINK_ACTIVE            (1 << 1)
# define DP_PSR_CRC_VERIFICATION            (1 << 2)
# define DP_PSR_FRAME_CAPTURE               (1 << 3)

#define DP_SINK_COUNT                       0x200
/* prior to 1.2 bit 7 was reserved mbz */
# define DP_GET_SINK_COUNT(x)               ((((x) & 0x80) >> 1) | ((x) & 0x3f))
# define DP_SINK_CP_READY                   (1 << 6)

#define DP_DEVICE_SERVICE_IRQ_VECTOR        0x201
# define DP_REMOTE_CONTROL_COMMAND_PENDING  (1 << 0)
# define DP_AUTOMATED_TEST_REQUEST          (1 << 1)
# define DP_CP_IRQ                          (1 << 2)
# define DP_SINK_SPECIFIC_IRQ               (1 << 6)

#define DP_LANE0_1_STATUS                   0x202
#define DP_LANE2_3_STATUS                   0x203
# define DP_LANE_CR_DONE                    (1 << 0)
# define DP_LANE_CHANNEL_EQ_DONE            (1 << 1)
# define DP_LANE_SYMBOL_LOCKED              (1 << 2)

#define DP_CHANNEL_EQ_BITS (DP_LANE_CR_DONE |           \
                            DP_LANE_CHANNEL_EQ_DONE |   \
                            DP_LANE_SYMBOL_LOCKED)

#define DP_LANE_ALIGN_STATUS_UPDATED        0x204

#define DP_INTERLANE_ALIGN_DONE             (1 << 0)
#define DP_DOWNSTREAM_PORT_STATUS_CHANGED   (1 << 6)
#define DP_LINK_STATUS_UPDATED              (1 << 7)

#define DP_SINK_STATUS                      0x205

#define DP_RECEIVE_PORT_0_STATUS            (1 << 0)
#define DP_RECEIVE_PORT_1_STATUS            (1 << 1)

#define DP_ADJUST_REQUEST_LANE0_1           0x206
#define DP_ADJUST_REQUEST_LANE2_3           0x207
# define DP_ADJUST_VOLTAGE_SWING_LANE0_MASK  0x03
# define DP_ADJUST_VOLTAGE_SWING_LANE0_SHIFT 0
# define DP_ADJUST_PRE_EMPHASIS_LANE0_MASK   0x0c
# define DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT  2
# define DP_ADJUST_VOLTAGE_SWING_LANE1_MASK  0x30
# define DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT 4
# define DP_ADJUST_PRE_EMPHASIS_LANE1_MASK   0xc0
# define DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT  6

#define DP_TEST_REQUEST                     0x218
# define DP_TEST_LINK_TRAINING              (1 << 0)
# define DP_TEST_LINK_PATTERN               (1 << 1)
# define DP_TEST_LINK_EDID_READ             (1 << 2)
# define DP_TEST_LINK_PHY_TEST_PATTERN      (1 << 3) /* DPCD >= 1.1 */

#define DP_TEST_LINK_RATE                   0x219
# define DP_LINK_RATE_162                   (0x6)
# define DP_LINK_RATE_27                    (0xa)

#define DP_TEST_LANE_COUNT                  0x220

#define DP_TEST_PATTERN                     0x221

#define DP_TEST_RESPONSE                    0x260
# define DP_TEST_ACK                        (1 << 0)
# define DP_TEST_NAK                        (1 << 1)
# define DP_TEST_EDID_CHECKSUM_WRITE        (1 << 2)

#define DP_SOURCE_OUI                       0x300
#define DP_SINK_OUI                         0x400
#define DP_BRANCH_OUI                       0x500

#define DP_SET_POWER                        0x600
# define DP_SET_POWER_D0                    0x1
# define DP_SET_POWER_D3                    0x2

#define DP_PSR_ERROR_STATUS                 0x2006  /* XXX 1.2? */
# define DP_PSR_LINK_CRC_ERROR              (1 << 0)
# define DP_PSR_RFB_STORAGE_ERROR           (1 << 1)

#define DP_PSR_ESI                          0x2007  /* XXX 1.2? */
# define DP_PSR_CAPS_CHANGE                 (1 << 0)

#define DP_PSR_STATUS                       0x2008  /* XXX 1.2? */
# define DP_PSR_SINK_INACTIVE               0
# define DP_PSR_SINK_ACTIVE_SRC_SYNCED      1
# define DP_PSR_SINK_ACTIVE_RFB             2
# define DP_PSR_SINK_ACTIVE_SINK_SYNCED     3
# define DP_PSR_SINK_ACTIVE_RESYNC          4
# define DP_PSR_SINK_INTERNAL_ERROR         7
# define DP_PSR_SINK_STATE_MASK             0x07

#define MODE_I2C_START  1
#define MODE_I2C_WRITE  2
#define MODE_I2C_READ   4
#define MODE_I2C_STOP   8

struct iic_dp_aux_data {
        bool running;
        u16 address;
        void *priv;
        int (*aux_ch)(device_t adapter, int mode, uint8_t write_byte,
            uint8_t *read_byte);
        device_t port;
};

int iic_dp_aux_add_bus(device_t dev, const char *name,
    int (*ch)(device_t idev, int mode, uint8_t write_byte, uint8_t *read_byte),
    void *priv, device_t *bus, device_t *adapter);


#define DP_LINK_STATUS_SIZE        6
bool drm_dp_channel_eq_ok(u8 link_status[DP_LINK_STATUS_SIZE],
                          int lane_count);
bool drm_dp_clock_recovery_ok(u8 link_status[DP_LINK_STATUS_SIZE],
                              int lane_count);
u8 drm_dp_get_adjust_request_voltage(u8 link_status[DP_LINK_STATUS_SIZE],
                                     int lane);
u8 drm_dp_get_adjust_request_pre_emphasis(u8 link_status[DP_LINK_STATUS_SIZE],
                                          int lane);

#define DP_RECEIVER_CAP_SIZE    0xf
void drm_dp_link_train_clock_recovery_delay(u8 dpcd[DP_RECEIVER_CAP_SIZE]);
void drm_dp_link_train_channel_eq_delay(u8 dpcd[DP_RECEIVER_CAP_SIZE]);

u8 drm_dp_link_rate_to_bw_code(int link_rate);
int drm_dp_bw_code_to_link_rate(u8 link_bw);

static inline int
drm_dp_max_link_rate(u8 dpcd[DP_RECEIVER_CAP_SIZE])
{
        return drm_dp_bw_code_to_link_rate(dpcd[DP_MAX_LINK_RATE]);
}

static inline u8
drm_dp_max_lane_count(u8 dpcd[DP_RECEIVER_CAP_SIZE])
{
        return dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK;
}

#endif /* _DRM_DP_HELPER_H_ */