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; 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 args.ucRegIndex = buf[0]; 64 if (num > 1) 65 memcpy(&out, &buf[1], num - 1); 66 args.lpI2CDataOut = cpu_to_le16(out); 67 } else { 68 if (num > ATOM_MAX_HW_I2C_READ) { 69 DRM_ERROR("hw i2c: tried to read too many bytes (%d vs 255)\n", num); 70 return -EINVAL; 71 } 72 args.ucRegIndex = 0; 73 args.lpI2CDataOut = 0; 74 } 75 76 args.ucFlag = flags; 77 args.ucI2CSpeed = TARGET_HW_I2C_CLOCK; 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 static int 97 radeon_atom_hw_i2c_xfer(device_t dev, struct iic_msg *msgs, u_int num) 98 { 99 struct radeon_i2c_chan *i2c = device_get_softc(dev); 100 struct iic_msg *p; 101 int i, remaining, current_count, buffer_offset, max_bytes, ret; 102 u8 buf = 0, flags; 103 104 /* check for bus probe */ 105 p = &msgs[0]; 106 if ((num == 1) && (p->len == 0)) { 107 ret = radeon_process_i2c_ch(i2c, 108 p->slave, HW_I2C_WRITE, 109 &buf, 1); 110 if (ret) 111 return ret; 112 else 113 return (0); 114 } 115 116 for (i = 0; i < num; i++) { 117 p = &msgs[i]; 118 remaining = p->len; 119 buffer_offset = 0; 120 /* max_bytes are a limitation of ProcessI2cChannelTransaction not the hw */ 121 if (p->flags & IIC_M_RD) { 122 max_bytes = ATOM_MAX_HW_I2C_READ; 123 flags = HW_I2C_READ; 124 } else { 125 max_bytes = ATOM_MAX_HW_I2C_WRITE; 126 flags = HW_I2C_WRITE; 127 } 128 while (remaining) { 129 if (remaining > max_bytes) 130 current_count = max_bytes; 131 else 132 current_count = remaining; 133 ret = radeon_process_i2c_ch(i2c, 134 p->slave, flags, 135 &p->buf[buffer_offset], current_count); 136 if (ret) 137 return ret; 138 remaining -= current_count; 139 buffer_offset += current_count; 140 } 141 } 142 143 return (0); 144 } 145 146 static int 147 radeon_atom_hw_i2c_probe(device_t dev) 148 { 149 150 return (BUS_PROBE_SPECIFIC); 151 } 152 153 static int 154 radeon_atom_hw_i2c_attach(device_t dev) 155 { 156 struct radeon_i2c_chan *i2c; 157 device_t iic_dev; 158 159 i2c = device_get_softc(dev); 160 device_set_desc(dev, i2c->name); 161 162 /* add generic bit-banging code */ 163 iic_dev = device_add_child(dev, "iicbus", -1); 164 if (iic_dev == NULL) 165 return (ENXIO); 166 device_quiet(iic_dev); 167 168 /* attach and probe added child */ 169 bus_generic_attach(dev); 170 171 return (0); 172 } 173 174 static int 175 radeon_atom_hw_i2c_detach(device_t dev) 176 { 177 /* detach bit-banding code. */ 178 bus_generic_detach(dev); 179 180 /* delete bit-banding code. */ 181 device_delete_children(dev); 182 return (0); 183 } 184 185 static int 186 radeon_atom_hw_i2c_reset(device_t dev, u_char speed, 187 u_char addr, u_char *oldaddr) 188 { 189 190 return (0); 191 } 192 193 static device_method_t radeon_atom_hw_i2c_methods[] = { 194 DEVMETHOD(device_probe, radeon_atom_hw_i2c_probe), 195 DEVMETHOD(device_attach, radeon_atom_hw_i2c_attach), 196 DEVMETHOD(device_detach, radeon_atom_hw_i2c_detach), 197 DEVMETHOD(iicbus_reset, radeon_atom_hw_i2c_reset), 198 DEVMETHOD(iicbus_transfer, radeon_atom_hw_i2c_xfer), 199 DEVMETHOD_END 200 }; 201 202 static driver_t radeon_atom_hw_i2c_driver = { 203 "radeon_atom_hw_i2c", 204 radeon_atom_hw_i2c_methods, 205 0 206 }; 207 208 static devclass_t radeon_atom_hw_i2c_devclass; 209 DRIVER_MODULE_ORDERED(radeon_atom_hw_i2c, drm, radeon_atom_hw_i2c_driver, 210 radeon_atom_hw_i2c_devclass, 0, 0, SI_ORDER_ANY); 211