2 * Copyright 2011 Advanced Micro Devices, Inc.
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:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
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.
22 * Authors: Alex Deucher
26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD$");
29 #include <dev/drm2/drmP.h>
30 #include <dev/drm2/radeon/radeon_drm.h>
31 #include <dev/iicbus/iic.h>
32 #include <dev/iicbus/iiconf.h>
33 #include <dev/iicbus/iicbus.h>
36 #include "iicbus_if.h"
39 #define TARGET_HW_I2C_CLOCK 50
41 /* these are a limitation of ProcessI2cChannelTransaction not the hw */
42 #define ATOM_MAX_HW_I2C_WRITE 2
43 #define ATOM_MAX_HW_I2C_READ 255
45 static int radeon_process_i2c_ch(struct radeon_i2c_chan *chan,
46 u8 slave_addr, u8 flags,
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);
56 memset(&args, 0, sizeof(args));
58 base = (unsigned char *)rdev->mode_info.atom_context->scratch;
60 if (flags & HW_I2C_WRITE) {
61 if (num > ATOM_MAX_HW_I2C_WRITE) {
62 DRM_ERROR("hw i2c: tried to write too many bytes (%d vs 2)\n", num);
65 memcpy(&out, buf, num);
66 args.lpI2CDataOut = cpu_to_le16(out);
68 #ifdef FREEBSD_WIP /* FreeBSD: to please GCC 4.2. */
69 if (num > ATOM_MAX_HW_I2C_READ) {
70 DRM_ERROR("hw i2c: tried to read too many bytes (%d vs 255)\n", num);
76 args.ucI2CSpeed = TARGET_HW_I2C_CLOCK;
78 args.ucTransBytes = num;
79 args.ucSlaveAddr = slave_addr << 1;
80 args.ucLineNumber = chan->rec.i2c_id;
82 atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
85 if (args.ucStatus != HW_ASSISTED_I2C_STATUS_SUCCESS) {
86 DRM_DEBUG_KMS("hw_i2c error\n");
90 if (!(flags & HW_I2C_WRITE))
91 memcpy(buf, base, num);
97 radeon_atom_hw_i2c_xfer(device_t dev, struct iic_msg *msgs, u_int num)
99 struct radeon_i2c_chan *i2c = device_get_softc(dev);
101 int i, remaining, current_count, buffer_offset, max_bytes, ret;
104 /* check for bus probe */
106 if ((num == 1) && (p->len == 0)) {
107 ret = radeon_process_i2c_ch(i2c,
108 p->slave, HW_I2C_WRITE,
111 return -ret; /* "ret" is returned on Linux. */
113 return (0); /* "num" is returned on Linux. */
116 for (i = 0; i < num; i++) {
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;
125 max_bytes = ATOM_MAX_HW_I2C_WRITE;
126 flags = HW_I2C_WRITE;
129 if (remaining > max_bytes)
130 current_count = max_bytes;
132 current_count = remaining;
133 ret = radeon_process_i2c_ch(i2c,
135 &p->buf[buffer_offset], current_count);
137 return -ret; /* "ret" is returned on Linux. */
138 remaining -= current_count;
139 buffer_offset += current_count;
143 return (0); /* "num" is returned on Linux. */
147 radeon_atom_hw_i2c_probe(device_t dev)
150 return (BUS_PROBE_SPECIFIC);
154 radeon_atom_hw_i2c_attach(device_t dev)
156 struct radeon_i2c_chan *i2c;
159 i2c = device_get_softc(dev);
160 device_set_desc(dev, i2c->name);
162 /* add generic bit-banging code */
163 iic_dev = device_add_child(dev, "iicbus", -1);
166 device_quiet(iic_dev);
168 /* attach and probe added child */
169 bus_generic_attach(dev);
175 radeon_atom_hw_i2c_detach(device_t dev)
177 /* detach bit-banding code. */
178 bus_generic_detach(dev);
180 /* delete bit-banding code. */
181 device_delete_children(dev);
186 radeon_atom_hw_i2c_reset(device_t dev, u_char speed,
187 u_char addr, u_char *oldaddr)
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),
202 static driver_t radeon_atom_hw_i2c_driver = {
203 "radeon_atom_hw_i2c",
204 radeon_atom_hw_i2c_methods,
208 static devclass_t radeon_atom_hw_i2c_devclass;
209 DRIVER_MODULE_ORDERED(radeon_atom_hw_i2c, drmn, radeon_atom_hw_i2c_driver,
210 radeon_atom_hw_i2c_devclass, 0, 0, SI_ORDER_ANY);