atombios_i2c.c revision 1.3
1/* $OpenBSD: atombios_i2c.c,v 1.3 2014/02/10 01:14:42 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 31extern 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 39int radeon_process_i2c_ch(struct radeon_i2c_chan *, u8, u8, u8 *, u8); 40 41int 42radeon_process_i2c_ch(struct radeon_i2c_chan *chan, 43 u8 slave_addr, u8 flags, 44 u8 *buf, u8 num) 45{ 46 struct drm_device *dev = chan->dev; 47 struct radeon_device *rdev = dev->dev_private; 48 PROCESS_I2C_CHANNEL_TRANSACTION_PS_ALLOCATION args; 49 int index = GetIndexIntoMasterTable(COMMAND, ProcessI2cChannelTransaction); 50 unsigned char *base; 51 u16 out; 52 53 memset(&args, 0, sizeof(args)); 54 55 base = (unsigned char *)rdev->mode_info.atom_context->scratch; 56 57 if (flags & HW_I2C_WRITE) { 58 if (num > ATOM_MAX_HW_I2C_WRITE) { 59 DRM_ERROR("hw i2c: tried to write too many bytes (%d vs 2)\n", num); 60 return -EINVAL; 61 } 62 if (num > 1) { 63 num--; 64 memcpy(&out, &buf[1], num); 65 } 66 args.lpI2CDataOut = cpu_to_le16(out); 67#if 0 68 } else { 69 if (num > ATOM_MAX_HW_I2C_READ) { 70 DRM_ERROR("hw i2c: tried to read too many bytes (%d vs 255)\n", num); 71 return -EINVAL; 72 } 73#endif 74 } 75 76 args.ucI2CSpeed = TARGET_HW_I2C_CLOCK; 77 args.ucRegIndex = 0; 78 args.ucTransBytes = num; 79 args.ucSlaveAddr = slave_addr << 1; 80 args.ucLineNumber = chan->rec.i2c_id; 81 82 atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args); 83 84 /* error */ 85 if (args.ucStatus != HW_ASSISTED_I2C_STATUS_SUCCESS) { 86 DRM_DEBUG_KMS("hw_i2c error\n"); 87 return -EIO; 88 } 89 90 if (!(flags & HW_I2C_WRITE)) 91 radeon_atom_copy_swap(buf, base, num, false); 92 93 return 0; 94} 95 96#ifdef notyet 97int radeon_atom_hw_i2c_xfer(struct i2c_controller *i2c_adap, 98 struct i2c_msg *msgs, int num) 99{ 100 struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap); 101 struct i2c_msg *p; 102 int i, remaining, current_count, buffer_offset, max_bytes, ret; 103 u8 buf = 0, flags; 104 105 /* check for bus probe */ 106 p = &msgs[0]; 107 if ((num == 1) && (p->len == 0)) { 108 ret = radeon_process_i2c_ch(i2c, 109 p->addr, HW_I2C_WRITE, 110 &buf, 1); 111 if (ret) 112 return ret; 113 else 114 return num; 115 } 116 117 for (i = 0; i < num; i++) { 118 p = &msgs[i]; 119 remaining = p->len; 120 buffer_offset = 0; 121 /* max_bytes are a limitation of ProcessI2cChannelTransaction not the hw */ 122 if (p->flags & I2C_M_RD) { 123 max_bytes = ATOM_MAX_HW_I2C_READ; 124 flags = HW_I2C_READ; 125 } else { 126 max_bytes = ATOM_MAX_HW_I2C_WRITE; 127 flags = HW_I2C_WRITE; 128 } 129 while (remaining) { 130 if (remaining > max_bytes) 131 current_count = max_bytes; 132 else 133 current_count = remaining; 134 ret = radeon_process_i2c_ch(i2c, 135 p->addr, flags, 136 &p->buf[buffer_offset], current_count); 137 if (ret) 138 return ret; 139 remaining -= current_count; 140 buffer_offset += current_count; 141 } 142 } 143 144 return num; 145} 146 147u32 radeon_atom_hw_i2c_func(struct i2c_controller *adap) 148{ 149 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; 150} 151#endif 152 153