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