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 int radeon_atom_hw_i2c_xfer(device_t dev, struct iic_msg *msgs, u_int num); 44 45 static int radeon_process_i2c_ch(struct radeon_i2c_chan *chan, 46 u8 slave_addr, u8 flags, 47 u8 *buf, u8 num) 48 { 49 struct drm_device *dev = chan->dev; 50 struct radeon_device *rdev = dev->dev_private; 51 PROCESS_I2C_CHANNEL_TRANSACTION_PS_ALLOCATION args; 52 int index = GetIndexIntoMasterTable(COMMAND, ProcessI2cChannelTransaction); 53 unsigned char *base; 54 u16 out = cpu_to_le16(0); 55 int r = 0; 56 57 memset(&args, 0, sizeof(args)); 58 59 mutex_lock(&chan->mutex); 60 mutex_lock(&rdev->mode_info.atom_context->scratch_mutex); 61 62 base = (unsigned char *)rdev->mode_info.atom_context->scratch; 63 64 if (flags & HW_I2C_WRITE) { 65 if (num > ATOM_MAX_HW_I2C_WRITE) { 66 DRM_ERROR("hw i2c: tried to write too many bytes (%d vs 3)\n", num); 67 r = -EINVAL; 68 goto done; 69 } 70 if (buf == NULL) 71 args.ucRegIndex = 0; 72 else 73 args.ucRegIndex = buf[0]; 74 if (num) 75 num--; 76 if (num) 77 memcpy(&out, &buf[1], num); 78 args.lpI2CDataOut = cpu_to_le16(out); 79 } else { 80 if (num > ATOM_MAX_HW_I2C_READ) { 81 DRM_ERROR("hw i2c: tried to read too many bytes (%d vs 255)\n", num); 82 r = -EINVAL; 83 goto done; 84 } 85 args.ucRegIndex = 0; 86 args.lpI2CDataOut = 0; 87 } 88 89 args.ucFlag = flags; 90 args.ucI2CSpeed = TARGET_HW_I2C_CLOCK; 91 args.ucTransBytes = num; 92 args.ucSlaveAddr = slave_addr << 1; 93 args.ucLineNumber = chan->rec.i2c_id; 94 95 atom_execute_table_scratch_unlocked(rdev->mode_info.atom_context, index, (uint32_t *)&args); 96 97 /* error */ 98 if (args.ucStatus != HW_ASSISTED_I2C_STATUS_SUCCESS) { 99 DRM_DEBUG_KMS("hw_i2c error\n"); 100 r = -EIO; 101 goto done; 102 } 103 104 if (!(flags & HW_I2C_WRITE)) 105 radeon_atom_copy_swap(buf, base, num, false); 106 107 done: 108 mutex_unlock(&rdev->mode_info.atom_context->scratch_mutex); 109 mutex_unlock(&chan->mutex); 110 111 return r; 112 } 113 114 int radeon_atom_hw_i2c_xfer(device_t dev, struct iic_msg *msgs, u_int num) 115 { 116 struct radeon_i2c_chan *i2c = device_get_softc(dev); 117 struct iic_msg *p; 118 int i, remaining, current_count, buffer_offset, max_bytes, ret; 119 u8 flags; 120 121 /* check for bus probe */ 122 p = &msgs[0]; 123 if ((num == 1) && (p->len == 0)) { 124 ret = radeon_process_i2c_ch(i2c, 125 p->slave, HW_I2C_WRITE, 126 NULL, 0); 127 if (ret) 128 return ret; 129 else 130 return (0); 131 } 132 133 for (i = 0; i < num; i++) { 134 p = &msgs[i]; 135 remaining = p->len; 136 buffer_offset = 0; 137 /* max_bytes are a limitation of ProcessI2cChannelTransaction not the hw */ 138 if (p->flags & IIC_M_RD) { 139 max_bytes = ATOM_MAX_HW_I2C_READ; 140 flags = HW_I2C_READ; 141 } else { 142 max_bytes = ATOM_MAX_HW_I2C_WRITE; 143 flags = HW_I2C_WRITE; 144 } 145 while (remaining) { 146 if (remaining > max_bytes) 147 current_count = max_bytes; 148 else 149 current_count = remaining; 150 ret = radeon_process_i2c_ch(i2c, 151 p->slave, flags, 152 &p->buf[buffer_offset], current_count); 153 if (ret) 154 return ret; 155 remaining -= current_count; 156 buffer_offset += current_count; 157 } 158 } 159 160 return (0); 161 } 162 163 static int 164 radeon_atom_hw_i2c_probe(device_t dev) 165 { 166 167 return (BUS_PROBE_SPECIFIC); 168 } 169 170 static int 171 radeon_atom_hw_i2c_attach(device_t dev) 172 { 173 struct radeon_i2c_chan *i2c; 174 device_t iic_dev; 175 176 i2c = device_get_softc(dev); 177 device_set_desc(dev, i2c->name); 178 179 /* add generic bit-banging code */ 180 iic_dev = device_add_child(dev, "iicbus", -1); 181 if (iic_dev == NULL) 182 return (ENXIO); 183 device_quiet(iic_dev); 184 185 /* attach and probe added child */ 186 bus_generic_attach(dev); 187 188 return (0); 189 } 190 191 static int 192 radeon_atom_hw_i2c_detach(device_t dev) 193 { 194 /* detach bit-banding code. */ 195 bus_generic_detach(dev); 196 197 /* delete bit-banding code. */ 198 device_delete_children(dev); 199 return (0); 200 } 201 202 static int 203 radeon_atom_hw_i2c_reset(device_t dev, u_char speed, 204 u_char addr, u_char *oldaddr) 205 { 206 207 return (0); 208 } 209 210 static device_method_t radeon_atom_hw_i2c_methods[] = { 211 DEVMETHOD(device_probe, radeon_atom_hw_i2c_probe), 212 DEVMETHOD(device_attach, radeon_atom_hw_i2c_attach), 213 DEVMETHOD(device_detach, radeon_atom_hw_i2c_detach), 214 DEVMETHOD(iicbus_reset, radeon_atom_hw_i2c_reset), 215 DEVMETHOD(iicbus_transfer, radeon_atom_hw_i2c_xfer), 216 DEVMETHOD_END 217 }; 218 219 static driver_t radeon_atom_hw_i2c_driver = { 220 "radeon_atom_hw_i2c", 221 radeon_atom_hw_i2c_methods, 222 0 223 }; 224 225 static devclass_t radeon_atom_hw_i2c_devclass; 226 DRIVER_MODULE_ORDERED(radeon_atom_hw_i2c, drm, radeon_atom_hw_i2c_driver, 227 radeon_atom_hw_i2c_devclass, NULL, NULL, SI_ORDER_ANY); 228