1 /* 2 * Copyright 2011 Advanced Micro Devices, 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: Alex Deucher 23 * 24 * $FreeBSD: head/sys/dev/drm2/radeon/atombios_i2c.c 254885 2013-08-25 19:37:15Z dumbbell $ 25 */ 26 27 #include <drm/drmP.h> 28 #include <uapi_drm/radeon_drm.h> 29 #include <bus/iicbus/iic.h> 30 #include <bus/iicbus/iiconf.h> 31 #include <bus/iicbus/iicbus.h> 32 #include "radeon.h" 33 #include "atom.h" 34 #include "iicbus_if.h" 35 #include "iicbb_if.h" 36 37 #define TARGET_HW_I2C_CLOCK 50 38 39 /* these are a limitation of ProcessI2cChannelTransaction not the hw */ 40 #define ATOM_MAX_HW_I2C_WRITE 3 41 #define ATOM_MAX_HW_I2C_READ 255 42 43 static int radeon_process_i2c_ch(struct radeon_i2c_chan *chan, 44 u8 slave_addr, u8 flags, 45 u8 *buf, u8 num) 46 { 47 struct drm_device *dev = chan->dev; 48 struct radeon_device *rdev = dev->dev_private; 49 PROCESS_I2C_CHANNEL_TRANSACTION_PS_ALLOCATION args; 50 int index = GetIndexIntoMasterTable(COMMAND, ProcessI2cChannelTransaction); 51 unsigned char *base; 52 u16 out = cpu_to_le16(0); 53 54 memset(&args, 0, sizeof(args)); 55 56 base = (unsigned char *)rdev->mode_info.atom_context->scratch; 57 58 if (flags & HW_I2C_WRITE) { 59 if (num > ATOM_MAX_HW_I2C_WRITE) { 60 DRM_ERROR("hw i2c: tried to write too many bytes (%d vs 3)\n", num); 61 return EINVAL; 62 } 63 if (buf == NULL) 64 args.ucRegIndex = 0; 65 else 66 args.ucRegIndex = buf[0]; 67 if (num) 68 num--; 69 if (num) 70 memcpy(&out, &buf[1], num); 71 args.lpI2CDataOut = cpu_to_le16(out); 72 } else { 73 if (num > ATOM_MAX_HW_I2C_READ) { 74 DRM_ERROR("hw i2c: tried to read too many bytes (%d vs 255)\n", num); 75 return -EINVAL; 76 } 77 args.ucRegIndex = 0; 78 args.lpI2CDataOut = 0; 79 } 80 81 args.ucFlag = flags; 82 args.ucI2CSpeed = TARGET_HW_I2C_CLOCK; 83 args.ucTransBytes = num; 84 args.ucSlaveAddr = slave_addr << 1; 85 args.ucLineNumber = chan->rec.i2c_id; 86 87 atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args); 88 89 /* error */ 90 if (args.ucStatus != HW_ASSISTED_I2C_STATUS_SUCCESS) { 91 DRM_DEBUG_KMS("hw_i2c error\n"); 92 return EIO; 93 } 94 95 if (!(flags & HW_I2C_WRITE)) 96 radeon_atom_copy_swap(buf, base, num, false); 97 98 return 0; 99 } 100 101 static int 102 radeon_atom_hw_i2c_xfer(device_t dev, struct iic_msg *msgs, u_int num) 103 { 104 struct radeon_i2c_chan *i2c = device_get_softc(dev); 105 struct iic_msg *p; 106 int i, remaining, current_count, buffer_offset, max_bytes, ret; 107 u8 flags; 108 109 /* check for bus probe */ 110 p = &msgs[0]; 111 if ((num == 1) && (p->len == 0)) { 112 ret = radeon_process_i2c_ch(i2c, 113 p->slave, HW_I2C_WRITE, 114 NULL, 0); 115 if (ret) 116 return ret; 117 else 118 return (0); 119 } 120 121 for (i = 0; i < num; i++) { 122 p = &msgs[i]; 123 remaining = p->len; 124 buffer_offset = 0; 125 /* max_bytes are a limitation of ProcessI2cChannelTransaction not the hw */ 126 if (p->flags & IIC_M_RD) { 127 max_bytes = ATOM_MAX_HW_I2C_READ; 128 flags = HW_I2C_READ; 129 } else { 130 max_bytes = ATOM_MAX_HW_I2C_WRITE; 131 flags = HW_I2C_WRITE; 132 } 133 while (remaining) { 134 if (remaining > max_bytes) 135 current_count = max_bytes; 136 else 137 current_count = remaining; 138 ret = radeon_process_i2c_ch(i2c, 139 p->slave, flags, 140 &p->buf[buffer_offset], current_count); 141 if (ret) 142 return ret; 143 remaining -= current_count; 144 buffer_offset += current_count; 145 } 146 } 147 148 return (0); 149 } 150 151 static int 152 radeon_atom_hw_i2c_probe(device_t dev) 153 { 154 155 return (BUS_PROBE_SPECIFIC); 156 } 157 158 static int 159 radeon_atom_hw_i2c_attach(device_t dev) 160 { 161 struct radeon_i2c_chan *i2c; 162 device_t iic_dev; 163 164 i2c = device_get_softc(dev); 165 device_set_desc(dev, i2c->name); 166 167 /* add generic bit-banging code */ 168 iic_dev = device_add_child(dev, "iicbus", -1); 169 if (iic_dev == NULL) 170 return (ENXIO); 171 device_quiet(iic_dev); 172 173 /* attach and probe added child */ 174 bus_generic_attach(dev); 175 176 return (0); 177 } 178 179 static int 180 radeon_atom_hw_i2c_detach(device_t dev) 181 { 182 /* detach bit-banding code. */ 183 bus_generic_detach(dev); 184 185 /* delete bit-banding code. */ 186 device_delete_children(dev); 187 return (0); 188 } 189 190 static int 191 radeon_atom_hw_i2c_reset(device_t dev, u_char speed, 192 u_char addr, u_char *oldaddr) 193 { 194 195 return (0); 196 } 197 198 static device_method_t radeon_atom_hw_i2c_methods[] = { 199 DEVMETHOD(device_probe, radeon_atom_hw_i2c_probe), 200 DEVMETHOD(device_attach, radeon_atom_hw_i2c_attach), 201 DEVMETHOD(device_detach, radeon_atom_hw_i2c_detach), 202 DEVMETHOD(iicbus_reset, radeon_atom_hw_i2c_reset), 203 DEVMETHOD(iicbus_transfer, radeon_atom_hw_i2c_xfer), 204 DEVMETHOD_END 205 }; 206 207 static driver_t radeon_atom_hw_i2c_driver = { 208 "radeon_atom_hw_i2c", 209 radeon_atom_hw_i2c_methods, 210 0 211 }; 212 213 static devclass_t radeon_atom_hw_i2c_devclass; 214 DRIVER_MODULE_ORDERED(radeon_atom_hw_i2c, drm, radeon_atom_hw_i2c_driver, 215 radeon_atom_hw_i2c_devclass, NULL, NULL, SI_ORDER_ANY); 216