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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2997 | Serge | 1 | /* |
| 2 | * Copyright 2011 Advanced Micro Devices, Inc. |
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| 3 | * |
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| 4 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 5 | * copy of this software and associated documentation files (the "Software"), |
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| 6 | * to deal in the Software without restriction, including without limitation |
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| 7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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| 8 | * and/or sell copies of the Software, and to permit persons to whom the |
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| 9 | * Software is furnished to do so, subject to the following conditions: |
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| 10 | * |
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| 11 | * The above copyright notice and this permission notice shall be included in |
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| 12 | * all copies or substantial portions of the Software. |
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| 13 | * |
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| 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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| 15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 17 | * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR |
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| 18 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
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| 19 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
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| 20 | * OTHER DEALINGS IN THE SOFTWARE. |
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| 21 | * |
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| 22 | * Authors: Alex Deucher |
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| 23 | * |
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| 24 | */ |
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| 25 | #include |
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| 26 | #include |
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| 27 | #include "radeon.h" |
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| 28 | #include "atom.h" |
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| 29 | |||
| 30 | #define TARGET_HW_I2C_CLOCK 50 |
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| 31 | |||
| 32 | /* these are a limitation of ProcessI2cChannelTransaction not the hw */ |
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| 5078 | serge | 33 | #define ATOM_MAX_HW_I2C_WRITE 3 |
| 2997 | Serge | 34 | #define ATOM_MAX_HW_I2C_READ 255 |
| 35 | |||
| 36 | static int radeon_process_i2c_ch(struct radeon_i2c_chan *chan, |
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| 37 | u8 slave_addr, u8 flags, |
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| 38 | u8 *buf, u8 num) |
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| 39 | { |
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| 40 | struct drm_device *dev = chan->dev; |
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| 41 | struct radeon_device *rdev = dev->dev_private; |
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| 42 | PROCESS_I2C_CHANNEL_TRANSACTION_PS_ALLOCATION args; |
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| 43 | int index = GetIndexIntoMasterTable(COMMAND, ProcessI2cChannelTransaction); |
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| 44 | unsigned char *base; |
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| 5078 | serge | 45 | u16 out = cpu_to_le16(0); |
| 46 | int r = 0; |
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| 2997 | Serge | 47 | |
| 48 | memset(&args, 0, sizeof(args)); |
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| 49 | |||
| 5078 | serge | 50 | mutex_lock(&chan->mutex); |
| 51 | |||
| 2997 | Serge | 52 | base = (unsigned char *)rdev->mode_info.atom_context->scratch; |
| 53 | |||
| 54 | if (flags & HW_I2C_WRITE) { |
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| 55 | if (num > ATOM_MAX_HW_I2C_WRITE) { |
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| 5078 | serge | 56 | DRM_ERROR("hw i2c: tried to write too many bytes (%d vs 3)\n", num); |
| 57 | r = -EINVAL; |
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| 58 | goto done; |
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| 2997 | Serge | 59 | } |
| 5078 | serge | 60 | if (buf == NULL) |
| 61 | args.ucRegIndex = 0; |
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| 62 | else |
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| 63 | args.ucRegIndex = buf[0]; |
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| 64 | if (num) |
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| 65 | num--; |
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| 66 | if (num) |
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| 67 | memcpy(&out, &buf[1], num); |
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| 2997 | Serge | 68 | args.lpI2CDataOut = cpu_to_le16(out); |
| 69 | } else { |
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| 70 | if (num > ATOM_MAX_HW_I2C_READ) { |
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| 71 | DRM_ERROR("hw i2c: tried to read too many bytes (%d vs 255)\n", num); |
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| 5078 | serge | 72 | r = -EINVAL; |
| 73 | goto done; |
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| 2997 | Serge | 74 | } |
| 5078 | serge | 75 | args.ucRegIndex = 0; |
| 76 | args.lpI2CDataOut = 0; |
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| 2997 | Serge | 77 | } |
| 78 | |||
| 5078 | serge | 79 | args.ucFlag = flags; |
| 2997 | Serge | 80 | args.ucI2CSpeed = TARGET_HW_I2C_CLOCK; |
| 81 | args.ucTransBytes = num; |
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| 82 | args.ucSlaveAddr = slave_addr << 1; |
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| 83 | args.ucLineNumber = chan->rec.i2c_id; |
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| 84 | |||
| 85 | atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args); |
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| 86 | |||
| 87 | /* error */ |
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| 88 | if (args.ucStatus != HW_ASSISTED_I2C_STATUS_SUCCESS) { |
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| 89 | DRM_DEBUG_KMS("hw_i2c error\n"); |
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| 5078 | serge | 90 | r = -EIO; |
| 91 | goto done; |
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| 2997 | Serge | 92 | } |
| 93 | |||
| 94 | if (!(flags & HW_I2C_WRITE)) |
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| 5078 | serge | 95 | radeon_atom_copy_swap(buf, base, num, false); |
| 2997 | Serge | 96 | |
| 5078 | serge | 97 | done: |
| 98 | mutex_unlock(&chan->mutex); |
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| 99 | |||
| 100 | return r; |
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| 2997 | Serge | 101 | } |
| 102 | |||
| 103 | int radeon_atom_hw_i2c_xfer(struct i2c_adapter *i2c_adap, |
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| 104 | struct i2c_msg *msgs, int num) |
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| 105 | { |
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| 106 | struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap); |
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| 107 | struct i2c_msg *p; |
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| 108 | int i, remaining, current_count, buffer_offset, max_bytes, ret; |
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| 5078 | serge | 109 | u8 flags; |
| 2997 | Serge | 110 | |
| 111 | /* check for bus probe */ |
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| 112 | p = &msgs[0]; |
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| 113 | if ((num == 1) && (p->len == 0)) { |
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| 114 | ret = radeon_process_i2c_ch(i2c, |
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| 115 | p->addr, HW_I2C_WRITE, |
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| 5078 | serge | 116 | NULL, 0); |
| 2997 | Serge | 117 | if (ret) |
| 118 | return ret; |
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| 119 | else |
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| 120 | return num; |
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| 121 | } |
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| 122 | |||
| 123 | for (i = 0; i < num; i++) { |
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| 124 | p = &msgs[i]; |
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| 125 | remaining = p->len; |
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| 126 | buffer_offset = 0; |
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| 127 | /* max_bytes are a limitation of ProcessI2cChannelTransaction not the hw */ |
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| 128 | if (p->flags & I2C_M_RD) { |
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| 129 | max_bytes = ATOM_MAX_HW_I2C_READ; |
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| 130 | flags = HW_I2C_READ; |
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| 131 | } else { |
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| 132 | max_bytes = ATOM_MAX_HW_I2C_WRITE; |
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| 133 | flags = HW_I2C_WRITE; |
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| 134 | } |
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| 135 | while (remaining) { |
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| 136 | if (remaining > max_bytes) |
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| 137 | current_count = max_bytes; |
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| 138 | else |
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| 139 | current_count = remaining; |
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| 140 | ret = radeon_process_i2c_ch(i2c, |
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| 141 | p->addr, flags, |
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| 142 | &p->buf[buffer_offset], current_count); |
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| 143 | if (ret) |
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| 144 | return ret; |
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| 145 | remaining -= current_count; |
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| 146 | buffer_offset += current_count; |
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| 147 | } |
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| 148 | } |
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| 149 | |||
| 150 | return num; |
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| 151 | } |
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| 152 | |||
| 153 | u32 radeon_atom_hw_i2c_func(struct i2c_adapter *adap) |
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| 154 | { |
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| 155 | return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; |
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| 156 | } |
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| 157 |