1254885Sdumbbell/* 2254885Sdumbbell * Copyright 2011 Advanced Micro Devices, Inc. 3254885Sdumbbell * 4254885Sdumbbell * Permission is hereby granted, free of charge, to any person obtaining a 5254885Sdumbbell * copy of this software and associated documentation files (the "Software"), 6254885Sdumbbell * to deal in the Software without restriction, including without limitation 7254885Sdumbbell * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8254885Sdumbbell * and/or sell copies of the Software, and to permit persons to whom the 9254885Sdumbbell * Software is furnished to do so, subject to the following conditions: 10254885Sdumbbell * 11254885Sdumbbell * The above copyright notice and this permission notice shall be included in 12254885Sdumbbell * all copies or substantial portions of the Software. 13254885Sdumbbell * 14254885Sdumbbell * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15254885Sdumbbell * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16254885Sdumbbell * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17254885Sdumbbell * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18254885Sdumbbell * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19254885Sdumbbell * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20254885Sdumbbell * OTHER DEALINGS IN THE SOFTWARE. 21254885Sdumbbell * 22254885Sdumbbell * Authors: Alex Deucher 23254885Sdumbbell * 24254885Sdumbbell */ 25254885Sdumbbell 26254885Sdumbbell#include <sys/cdefs.h> 27254885Sdumbbell__FBSDID("$FreeBSD$"); 28254885Sdumbbell 29254885Sdumbbell#include <dev/drm2/drmP.h> 30254885Sdumbbell#include <dev/drm2/radeon/radeon_drm.h> 31254885Sdumbbell#include <dev/iicbus/iic.h> 32254885Sdumbbell#include <dev/iicbus/iiconf.h> 33254885Sdumbbell#include <dev/iicbus/iicbus.h> 34254885Sdumbbell#include "radeon.h" 35254885Sdumbbell#include "atom.h" 36254885Sdumbbell#include "iicbus_if.h" 37254885Sdumbbell#include "iicbb_if.h" 38254885Sdumbbell 39254885Sdumbbell#define TARGET_HW_I2C_CLOCK 50 40254885Sdumbbell 41254885Sdumbbell/* these are a limitation of ProcessI2cChannelTransaction not the hw */ 42254885Sdumbbell#define ATOM_MAX_HW_I2C_WRITE 2 43254885Sdumbbell#define ATOM_MAX_HW_I2C_READ 255 44254885Sdumbbell 45254885Sdumbbellstatic int radeon_process_i2c_ch(struct radeon_i2c_chan *chan, 46254885Sdumbbell u8 slave_addr, u8 flags, 47254885Sdumbbell u8 *buf, u8 num) 48254885Sdumbbell{ 49254885Sdumbbell struct drm_device *dev = chan->dev; 50254885Sdumbbell struct radeon_device *rdev = dev->dev_private; 51254885Sdumbbell PROCESS_I2C_CHANNEL_TRANSACTION_PS_ALLOCATION args; 52254885Sdumbbell int index = GetIndexIntoMasterTable(COMMAND, ProcessI2cChannelTransaction); 53254885Sdumbbell unsigned char *base; 54254885Sdumbbell u16 out; 55254885Sdumbbell 56254885Sdumbbell memset(&args, 0, sizeof(args)); 57254885Sdumbbell 58254885Sdumbbell base = (unsigned char *)rdev->mode_info.atom_context->scratch; 59254885Sdumbbell 60254885Sdumbbell if (flags & HW_I2C_WRITE) { 61254885Sdumbbell if (num > ATOM_MAX_HW_I2C_WRITE) { 62254885Sdumbbell DRM_ERROR("hw i2c: tried to write too many bytes (%d vs 2)\n", num); 63254885Sdumbbell return EINVAL; 64254885Sdumbbell } 65254885Sdumbbell memcpy(&out, buf, num); 66254885Sdumbbell args.lpI2CDataOut = cpu_to_le16(out); 67254885Sdumbbell } 68254885Sdumbbell 69254885Sdumbbell args.ucI2CSpeed = TARGET_HW_I2C_CLOCK; 70254885Sdumbbell args.ucRegIndex = 0; 71254885Sdumbbell args.ucTransBytes = num; 72254885Sdumbbell args.ucSlaveAddr = slave_addr << 1; 73254885Sdumbbell args.ucLineNumber = chan->rec.i2c_id; 74254885Sdumbbell 75254885Sdumbbell atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args); 76254885Sdumbbell 77254885Sdumbbell /* error */ 78254885Sdumbbell if (args.ucStatus != HW_ASSISTED_I2C_STATUS_SUCCESS) { 79254885Sdumbbell DRM_DEBUG_KMS("hw_i2c error\n"); 80254885Sdumbbell return EIO; 81254885Sdumbbell } 82254885Sdumbbell 83254885Sdumbbell if (!(flags & HW_I2C_WRITE)) 84254885Sdumbbell memcpy(buf, base, num); 85254885Sdumbbell 86254885Sdumbbell return 0; 87254885Sdumbbell} 88254885Sdumbbell 89254885Sdumbbellstatic int 90254885Sdumbbellradeon_atom_hw_i2c_xfer(device_t dev, struct iic_msg *msgs, u_int num) 91254885Sdumbbell{ 92254885Sdumbbell struct radeon_i2c_chan *i2c = device_get_softc(dev); 93254885Sdumbbell struct iic_msg *p; 94254885Sdumbbell int i, remaining, current_count, buffer_offset, max_bytes, ret; 95254885Sdumbbell u8 buf = 0, flags; 96254885Sdumbbell 97254885Sdumbbell /* check for bus probe */ 98254885Sdumbbell p = &msgs[0]; 99254885Sdumbbell if ((num == 1) && (p->len == 0)) { 100254885Sdumbbell ret = radeon_process_i2c_ch(i2c, 101254885Sdumbbell p->slave, HW_I2C_WRITE, 102254885Sdumbbell &buf, 1); 103254885Sdumbbell if (ret) 104254885Sdumbbell return ret; 105254885Sdumbbell else 106254885Sdumbbell return (0); 107254885Sdumbbell } 108254885Sdumbbell 109254885Sdumbbell for (i = 0; i < num; i++) { 110254885Sdumbbell p = &msgs[i]; 111254885Sdumbbell remaining = p->len; 112254885Sdumbbell buffer_offset = 0; 113254885Sdumbbell /* max_bytes are a limitation of ProcessI2cChannelTransaction not the hw */ 114254885Sdumbbell if (p->flags & IIC_M_RD) { 115254885Sdumbbell max_bytes = ATOM_MAX_HW_I2C_READ; 116254885Sdumbbell flags = HW_I2C_READ; 117254885Sdumbbell } else { 118254885Sdumbbell max_bytes = ATOM_MAX_HW_I2C_WRITE; 119254885Sdumbbell flags = HW_I2C_WRITE; 120254885Sdumbbell } 121254885Sdumbbell while (remaining) { 122254885Sdumbbell if (remaining > max_bytes) 123254885Sdumbbell current_count = max_bytes; 124254885Sdumbbell else 125254885Sdumbbell current_count = remaining; 126254885Sdumbbell ret = radeon_process_i2c_ch(i2c, 127254885Sdumbbell p->slave, flags, 128254885Sdumbbell &p->buf[buffer_offset], current_count); 129254885Sdumbbell if (ret) 130254885Sdumbbell return ret; 131254885Sdumbbell remaining -= current_count; 132254885Sdumbbell buffer_offset += current_count; 133254885Sdumbbell } 134254885Sdumbbell } 135254885Sdumbbell 136254885Sdumbbell return (0); 137254885Sdumbbell} 138254885Sdumbbell 139254885Sdumbbellstatic int 140254885Sdumbbellradeon_atom_hw_i2c_probe(device_t dev) 141254885Sdumbbell{ 142254885Sdumbbell 143254885Sdumbbell return (BUS_PROBE_SPECIFIC); 144254885Sdumbbell} 145254885Sdumbbell 146254885Sdumbbellstatic int 147254885Sdumbbellradeon_atom_hw_i2c_attach(device_t dev) 148254885Sdumbbell{ 149254885Sdumbbell struct radeon_i2c_chan *i2c; 150254885Sdumbbell device_t iic_dev; 151254885Sdumbbell 152254885Sdumbbell i2c = device_get_softc(dev); 153254885Sdumbbell device_set_desc(dev, i2c->name); 154254885Sdumbbell 155254885Sdumbbell /* add generic bit-banging code */ 156254885Sdumbbell iic_dev = device_add_child(dev, "iicbus", -1); 157254885Sdumbbell if (iic_dev == NULL) 158254885Sdumbbell return (ENXIO); 159254885Sdumbbell device_quiet(iic_dev); 160254885Sdumbbell 161254885Sdumbbell /* attach and probe added child */ 162254885Sdumbbell bus_generic_attach(dev); 163254885Sdumbbell 164254885Sdumbbell return (0); 165254885Sdumbbell} 166254885Sdumbbell 167254885Sdumbbellstatic int 168254885Sdumbbellradeon_atom_hw_i2c_detach(device_t dev) 169254885Sdumbbell{ 170254885Sdumbbell /* detach bit-banding code. */ 171254885Sdumbbell bus_generic_detach(dev); 172254885Sdumbbell 173254885Sdumbbell /* delete bit-banding code. */ 174254885Sdumbbell device_delete_children(dev); 175254885Sdumbbell return (0); 176254885Sdumbbell} 177254885Sdumbbell 178254885Sdumbbellstatic int 179254885Sdumbbellradeon_atom_hw_i2c_reset(device_t dev, u_char speed, 180254885Sdumbbell u_char addr, u_char *oldaddr) 181254885Sdumbbell{ 182254885Sdumbbell 183254885Sdumbbell return (0); 184254885Sdumbbell} 185254885Sdumbbell 186254885Sdumbbellstatic device_method_t radeon_atom_hw_i2c_methods[] = { 187254885Sdumbbell DEVMETHOD(device_probe, radeon_atom_hw_i2c_probe), 188254885Sdumbbell DEVMETHOD(device_attach, radeon_atom_hw_i2c_attach), 189254885Sdumbbell DEVMETHOD(device_detach, radeon_atom_hw_i2c_detach), 190254885Sdumbbell DEVMETHOD(iicbus_reset, radeon_atom_hw_i2c_reset), 191254885Sdumbbell DEVMETHOD(iicbus_transfer, radeon_atom_hw_i2c_xfer), 192254885Sdumbbell DEVMETHOD_END 193254885Sdumbbell}; 194254885Sdumbbell 195254885Sdumbbellstatic driver_t radeon_atom_hw_i2c_driver = { 196254885Sdumbbell "radeon_atom_hw_i2c", 197254885Sdumbbell radeon_atom_hw_i2c_methods, 198254885Sdumbbell 0 199254885Sdumbbell}; 200254885Sdumbbell 201254885Sdumbbellstatic devclass_t radeon_atom_hw_i2c_devclass; 202254885SdumbbellDRIVER_MODULE_ORDERED(radeon_atom_hw_i2c, drmn, radeon_atom_hw_i2c_driver, 203254885Sdumbbell radeon_atom_hw_i2c_devclass, 0, 0, SI_ORDER_ANY); 204