Dave Airlie | 875711f | 2015-02-20 09:21:36 +1000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2015 Red Hat Inc. |
| 3 | * |
| 4 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 5 | * copy of this software and associated documentation files (the "Software"), |
| 6 | * to deal in the Software without restriction, including without limitation |
| 7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| 8 | * and/or sell copies of the Software, and to permit persons to whom the |
| 9 | * Software is furnished to do so, subject to the following conditions: |
| 10 | * |
| 11 | * The above copyright notice and this permission notice shall be included in |
| 12 | * all copies or substantial portions of the Software. |
| 13 | * |
| 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 17 | * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| 18 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| 19 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
| 20 | * OTHER DEALINGS IN THE SOFTWARE. |
| 21 | * |
| 22 | * Authors: Dave Airlie |
| 23 | */ |
| 24 | #include <drm/drmP.h> |
| 25 | #include <drm/radeon_drm.h> |
| 26 | #include "radeon.h" |
| 27 | #include "nid.h" |
| 28 | |
| 29 | #define AUX_RX_ERROR_FLAGS (AUX_SW_RX_OVERFLOW | \ |
| 30 | AUX_SW_RX_HPD_DISCON | \ |
| 31 | AUX_SW_RX_PARTIAL_BYTE | \ |
| 32 | AUX_SW_NON_AUX_MODE | \ |
Dave Airlie | 875711f | 2015-02-20 09:21:36 +1000 | [diff] [blame] | 33 | AUX_SW_RX_SYNC_INVALID_L | \ |
| 34 | AUX_SW_RX_SYNC_INVALID_H | \ |
| 35 | AUX_SW_RX_INVALID_START | \ |
| 36 | AUX_SW_RX_RECV_NO_DET | \ |
| 37 | AUX_SW_RX_RECV_INVALID_H | \ |
| 38 | AUX_SW_RX_RECV_INVALID_V) |
| 39 | |
| 40 | #define AUX_SW_REPLY_GET_BYTE_COUNT(x) (((x) >> 24) & 0x1f) |
| 41 | |
| 42 | #define BARE_ADDRESS_SIZE 3 |
| 43 | |
| 44 | static const u32 aux_offset[] = |
| 45 | { |
| 46 | 0x6200 - 0x6200, |
| 47 | 0x6250 - 0x6200, |
| 48 | 0x62a0 - 0x6200, |
| 49 | 0x6300 - 0x6200, |
| 50 | 0x6350 - 0x6200, |
| 51 | 0x63a0 - 0x6200, |
| 52 | }; |
| 53 | |
| 54 | ssize_t |
| 55 | radeon_dp_aux_transfer_native(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg) |
| 56 | { |
| 57 | struct radeon_i2c_chan *chan = |
| 58 | container_of(aux, struct radeon_i2c_chan, aux); |
| 59 | struct drm_device *dev = chan->dev; |
| 60 | struct radeon_device *rdev = dev->dev_private; |
| 61 | int ret = 0, i; |
| 62 | uint32_t tmp, ack = 0; |
| 63 | int instance = chan->rec.i2c_id & 0xf; |
| 64 | u8 byte; |
| 65 | u8 *buf = msg->buffer; |
| 66 | int retry_count = 0; |
| 67 | int bytes; |
| 68 | int msize; |
| 69 | bool is_write = false; |
| 70 | |
| 71 | if (WARN_ON(msg->size > 16)) |
| 72 | return -E2BIG; |
| 73 | |
| 74 | switch (msg->request & ~DP_AUX_I2C_MOT) { |
| 75 | case DP_AUX_NATIVE_WRITE: |
| 76 | case DP_AUX_I2C_WRITE: |
| 77 | is_write = true; |
| 78 | break; |
| 79 | case DP_AUX_NATIVE_READ: |
| 80 | case DP_AUX_I2C_READ: |
| 81 | break; |
| 82 | default: |
| 83 | return -EINVAL; |
| 84 | } |
| 85 | |
| 86 | /* work out two sizes required */ |
| 87 | msize = 0; |
| 88 | bytes = BARE_ADDRESS_SIZE; |
| 89 | if (msg->size) { |
| 90 | msize = msg->size - 1; |
| 91 | bytes++; |
| 92 | if (is_write) |
| 93 | bytes += msg->size; |
| 94 | } |
| 95 | |
| 96 | mutex_lock(&chan->mutex); |
| 97 | |
| 98 | /* switch the pad to aux mode */ |
| 99 | tmp = RREG32(chan->rec.mask_clk_reg); |
| 100 | tmp |= (1 << 16); |
| 101 | WREG32(chan->rec.mask_clk_reg, tmp); |
| 102 | |
| 103 | /* setup AUX control register with correct HPD pin */ |
| 104 | tmp = RREG32(AUX_CONTROL + aux_offset[instance]); |
| 105 | |
| 106 | tmp &= AUX_HPD_SEL(0x7); |
| 107 | tmp |= AUX_HPD_SEL(chan->rec.hpd); |
Michel Dänzer | 9dc7996 | 2016-10-24 16:52:20 +0900 | [diff] [blame] | 108 | tmp |= AUX_EN | AUX_LS_READ_EN; |
Dave Airlie | 875711f | 2015-02-20 09:21:36 +1000 | [diff] [blame] | 109 | |
| 110 | WREG32(AUX_CONTROL + aux_offset[instance], tmp); |
| 111 | |
| 112 | /* atombios appears to write this twice lets copy it */ |
| 113 | WREG32(AUX_SW_CONTROL + aux_offset[instance], |
| 114 | AUX_SW_WR_BYTES(bytes)); |
| 115 | WREG32(AUX_SW_CONTROL + aux_offset[instance], |
| 116 | AUX_SW_WR_BYTES(bytes)); |
| 117 | |
| 118 | /* write the data header into the registers */ |
Alex Deucher | 7040c39 | 2015-08-31 11:15:05 -0400 | [diff] [blame] | 119 | /* request, address, msg size */ |
| 120 | byte = (msg->request << 4) | ((msg->address >> 16) & 0xf); |
Dave Airlie | 875711f | 2015-02-20 09:21:36 +1000 | [diff] [blame] | 121 | WREG32(AUX_SW_DATA + aux_offset[instance], |
| 122 | AUX_SW_DATA_MASK(byte) | AUX_SW_AUTOINCREMENT_DISABLE); |
| 123 | |
| 124 | byte = (msg->address >> 8) & 0xff; |
| 125 | WREG32(AUX_SW_DATA + aux_offset[instance], |
| 126 | AUX_SW_DATA_MASK(byte)); |
| 127 | |
| 128 | byte = msg->address & 0xff; |
| 129 | WREG32(AUX_SW_DATA + aux_offset[instance], |
| 130 | AUX_SW_DATA_MASK(byte)); |
| 131 | |
| 132 | byte = msize; |
| 133 | WREG32(AUX_SW_DATA + aux_offset[instance], |
| 134 | AUX_SW_DATA_MASK(byte)); |
| 135 | |
| 136 | /* if we are writing - write the msg buffer */ |
| 137 | if (is_write) { |
| 138 | for (i = 0; i < msg->size; i++) { |
| 139 | WREG32(AUX_SW_DATA + aux_offset[instance], |
| 140 | AUX_SW_DATA_MASK(buf[i])); |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | /* clear the ACK */ |
| 145 | WREG32(AUX_SW_INTERRUPT_CONTROL + aux_offset[instance], AUX_SW_DONE_ACK); |
| 146 | |
| 147 | /* write the size and GO bits */ |
| 148 | WREG32(AUX_SW_CONTROL + aux_offset[instance], |
| 149 | AUX_SW_WR_BYTES(bytes) | AUX_SW_GO); |
| 150 | |
| 151 | /* poll the status registers - TODO irq support */ |
| 152 | do { |
| 153 | tmp = RREG32(AUX_SW_STATUS + aux_offset[instance]); |
| 154 | if (tmp & AUX_SW_DONE) { |
| 155 | break; |
| 156 | } |
| 157 | usleep_range(100, 200); |
| 158 | } while (retry_count++ < 1000); |
| 159 | |
| 160 | if (retry_count >= 1000) { |
| 161 | DRM_ERROR("auxch hw never signalled completion, error %08x\n", tmp); |
| 162 | ret = -EIO; |
| 163 | goto done; |
| 164 | } |
| 165 | |
| 166 | if (tmp & AUX_SW_RX_TIMEOUT) { |
Dave Airlie | 875711f | 2015-02-20 09:21:36 +1000 | [diff] [blame] | 167 | ret = -ETIMEDOUT; |
| 168 | goto done; |
| 169 | } |
| 170 | if (tmp & AUX_RX_ERROR_FLAGS) { |
| 171 | DRM_DEBUG_KMS("dp_aux_ch flags not zero: %08x\n", tmp); |
| 172 | ret = -EIO; |
| 173 | goto done; |
| 174 | } |
| 175 | |
| 176 | bytes = AUX_SW_REPLY_GET_BYTE_COUNT(tmp); |
| 177 | if (bytes) { |
| 178 | WREG32(AUX_SW_DATA + aux_offset[instance], |
| 179 | AUX_SW_DATA_RW | AUX_SW_AUTOINCREMENT_DISABLE); |
| 180 | |
| 181 | tmp = RREG32(AUX_SW_DATA + aux_offset[instance]); |
| 182 | ack = (tmp >> 8) & 0xff; |
| 183 | |
| 184 | for (i = 0; i < bytes - 1; i++) { |
| 185 | tmp = RREG32(AUX_SW_DATA + aux_offset[instance]); |
| 186 | if (buf) |
| 187 | buf[i] = (tmp >> 8) & 0xff; |
| 188 | } |
| 189 | if (buf) |
| 190 | ret = bytes - 1; |
| 191 | } |
| 192 | |
| 193 | WREG32(AUX_SW_INTERRUPT_CONTROL + aux_offset[instance], AUX_SW_DONE_ACK); |
| 194 | |
| 195 | if (is_write) |
| 196 | ret = msg->size; |
| 197 | done: |
| 198 | mutex_unlock(&chan->mutex); |
| 199 | |
| 200 | if (ret >= 0) |
| 201 | msg->reply = ack >> 4; |
| 202 | return ret; |
| 203 | } |