1 /* $OpenBSD: atombios_i2c.c,v 1.5 2015/04/06 07:38:49 jsg Exp $ */ 2 /* 3 * Copyright 2011 Advanced Micro Devices, Inc. 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining a 6 * copy of this software and associated documentation files (the "Software"), 7 * to deal in the Software without restriction, including without limitation 8 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 9 * and/or sell copies of the Software, and to permit persons to whom the 10 * Software is furnished to do so, subject to the following conditions: 11 * 12 * The above copyright notice and this permission notice shall be included in 13 * all copies or substantial portions of the Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 19 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 20 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 21 * OTHER DEALINGS IN THE SOFTWARE. 22 * 23 * Authors: Alex Deucher 24 * 25 */ 26 #include <dev/pci/drm/drmP.h> 27 #include <dev/pci/drm/radeon_drm.h> 28 #include "radeon.h" 29 #include "atom.h" 30 31 extern void radeon_atom_copy_swap(u8 *dst, u8 *src, u8 num_bytes, bool to_le); 32 33 #define TARGET_HW_I2C_CLOCK 50 34 35 /* these are a limitation of ProcessI2cChannelTransaction not the hw */ 36 #define ATOM_MAX_HW_I2C_WRITE 2 37 #define ATOM_MAX_HW_I2C_READ 255 38 39 #ifdef notyet 40 static int radeon_process_i2c_ch(struct radeon_i2c_chan *chan, 41 u8 slave_addr, u8 flags, 42 u8 *buf, u8 num) 43 { 44 struct drm_device *dev = chan->dev; 45 struct radeon_device *rdev = dev->dev_private; 46 PROCESS_I2C_CHANNEL_TRANSACTION_PS_ALLOCATION args; 47 int index = GetIndexIntoMasterTable(COMMAND, ProcessI2cChannelTransaction); 48 unsigned char *base; 49 u16 out = cpu_to_le16(0); 50 51 memset(&args, 0, sizeof(args)); 52 53 base = (unsigned char *)rdev->mode_info.atom_context->scratch; 54 55 if (flags & HW_I2C_WRITE) { 56 if (num > ATOM_MAX_HW_I2C_WRITE) { 57 DRM_ERROR("hw i2c: tried to write too many bytes (%d vs 2)\n", num); 58 return -EINVAL; 59 } 60 if (buf == NULL) 61 args.ucRegIndex = 0; 62 else 63 args.ucRegIndex = buf[0]; 64 if (num) 65 num--; 66 if (num) 67 memcpy(&out, &buf[1], num); 68 args.lpI2CDataOut = cpu_to_le16(out); 69 #if 0 70 } else { 71 if (num > ATOM_MAX_HW_I2C_READ) { 72 DRM_ERROR("hw i2c: tried to read too many bytes (%d vs 255)\n", num); 73 return -EINVAL; 74 } 75 #endif 76 } 77 78 args.ucI2CSpeed = TARGET_HW_I2C_CLOCK; 79 args.ucRegIndex = 0; 80 args.ucTransBytes = num; 81 args.ucSlaveAddr = slave_addr << 1; 82 args.ucLineNumber = chan->rec.i2c_id; 83 84 atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args); 85 86 /* error */ 87 if (args.ucStatus != HW_ASSISTED_I2C_STATUS_SUCCESS) { 88 DRM_DEBUG_KMS("hw_i2c error\n"); 89 return -EIO; 90 } 91 92 if (!(flags & HW_I2C_WRITE)) 93 radeon_atom_copy_swap(buf, base, num, false); 94 95 return 0; 96 } 97 98 int radeon_atom_hw_i2c_xfer(struct i2c_controller *i2c_adap, 99 struct i2c_msg *msgs, int num) 100 { 101 struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap); 102 struct i2c_msg *p; 103 int i, remaining, current_count, buffer_offset, max_bytes, ret; 104 u8 flags; 105 106 /* check for bus probe */ 107 p = &msgs[0]; 108 if ((num == 1) && (p->len == 0)) { 109 ret = radeon_process_i2c_ch(i2c, 110 p->addr, HW_I2C_WRITE, 111 NULL, 0); 112 if (ret) 113 return ret; 114 else 115 return num; 116 } 117 118 for (i = 0; i < num; i++) { 119 p = &msgs[i]; 120 remaining = p->len; 121 buffer_offset = 0; 122 /* max_bytes are a limitation of ProcessI2cChannelTransaction not the hw */ 123 if (p->flags & I2C_M_RD) { 124 max_bytes = ATOM_MAX_HW_I2C_READ; 125 flags = HW_I2C_READ; 126 } else { 127 max_bytes = ATOM_MAX_HW_I2C_WRITE; 128 flags = HW_I2C_WRITE; 129 } 130 while (remaining) { 131 if (remaining > max_bytes) 132 current_count = max_bytes; 133 else 134 current_count = remaining; 135 ret = radeon_process_i2c_ch(i2c, 136 p->addr, flags, 137 &p->buf[buffer_offset], current_count); 138 if (ret) 139 return ret; 140 remaining -= current_count; 141 buffer_offset += current_count; 142 } 143 } 144 145 return num; 146 } 147 148 u32 radeon_atom_hw_i2c_func(struct i2c_controller *adap) 149 { 150 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; 151 } 152 #endif 153 154