![Alex Deucher](/assets/img/avatar_default.png)
This adds the non-asic specific core driver code. v2: remove extra kconfig option v3: implement minor fixes from Fengguang Wu v4: fix cast in amdgpu_ucode.c Acked-by: Christian König <christian.koenig@amd.com> Acked-by: Jammy Zhou <Jammy.Zhou@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
159 lines
4.3 KiB
C
159 lines
4.3 KiB
C
/*
|
|
* Copyright 2011 Advanced Micro Devices, Inc.
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a
|
|
* copy of this software and associated documentation files (the "Software"),
|
|
* to deal in the Software without restriction, including without limitation
|
|
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
|
* and/or sell copies of the Software, and to permit persons to whom the
|
|
* Software is furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
|
|
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
|
|
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
|
|
* OTHER DEALINGS IN THE SOFTWARE.
|
|
*
|
|
* Authors: Alex Deucher
|
|
*
|
|
*/
|
|
#include <drm/drmP.h>
|
|
#include <drm/amdgpu_drm.h>
|
|
#include "amdgpu.h"
|
|
#include "atom.h"
|
|
#include "amdgpu_atombios.h"
|
|
|
|
#define TARGET_HW_I2C_CLOCK 50
|
|
|
|
/* these are a limitation of ProcessI2cChannelTransaction not the hw */
|
|
#define ATOM_MAX_HW_I2C_WRITE 3
|
|
#define ATOM_MAX_HW_I2C_READ 255
|
|
|
|
static int amdgpu_atombios_i2c_process_i2c_ch(struct amdgpu_i2c_chan *chan,
|
|
u8 slave_addr, u8 flags,
|
|
u8 *buf, u8 num)
|
|
{
|
|
struct drm_device *dev = chan->dev;
|
|
struct amdgpu_device *adev = dev->dev_private;
|
|
PROCESS_I2C_CHANNEL_TRANSACTION_PS_ALLOCATION args;
|
|
int index = GetIndexIntoMasterTable(COMMAND, ProcessI2cChannelTransaction);
|
|
unsigned char *base;
|
|
u16 out = cpu_to_le16(0);
|
|
int r = 0;
|
|
|
|
memset(&args, 0, sizeof(args));
|
|
|
|
mutex_lock(&chan->mutex);
|
|
|
|
base = (unsigned char *)adev->mode_info.atom_context->scratch;
|
|
|
|
if (flags & HW_I2C_WRITE) {
|
|
if (num > ATOM_MAX_HW_I2C_WRITE) {
|
|
DRM_ERROR("hw i2c: tried to write too many bytes (%d vs 3)\n", num);
|
|
r = -EINVAL;
|
|
goto done;
|
|
}
|
|
if (buf == NULL)
|
|
args.ucRegIndex = 0;
|
|
else
|
|
args.ucRegIndex = buf[0];
|
|
if (num)
|
|
num--;
|
|
if (num)
|
|
memcpy(&out, &buf[1], num);
|
|
args.lpI2CDataOut = cpu_to_le16(out);
|
|
} else {
|
|
if (num > ATOM_MAX_HW_I2C_READ) {
|
|
DRM_ERROR("hw i2c: tried to read too many bytes (%d vs 255)\n", num);
|
|
r = -EINVAL;
|
|
goto done;
|
|
}
|
|
args.ucRegIndex = 0;
|
|
args.lpI2CDataOut = 0;
|
|
}
|
|
|
|
args.ucFlag = flags;
|
|
args.ucI2CSpeed = TARGET_HW_I2C_CLOCK;
|
|
args.ucTransBytes = num;
|
|
args.ucSlaveAddr = slave_addr << 1;
|
|
args.ucLineNumber = chan->rec.i2c_id;
|
|
|
|
amdgpu_atom_execute_table(adev->mode_info.atom_context, index, (uint32_t *)&args);
|
|
|
|
/* error */
|
|
if (args.ucStatus != HW_ASSISTED_I2C_STATUS_SUCCESS) {
|
|
DRM_DEBUG_KMS("hw_i2c error\n");
|
|
r = -EIO;
|
|
goto done;
|
|
}
|
|
|
|
if (!(flags & HW_I2C_WRITE))
|
|
amdgpu_atombios_copy_swap(buf, base, num, false);
|
|
|
|
done:
|
|
mutex_unlock(&chan->mutex);
|
|
|
|
return r;
|
|
}
|
|
|
|
int amdgpu_atombios_i2c_xfer(struct i2c_adapter *i2c_adap,
|
|
struct i2c_msg *msgs, int num)
|
|
{
|
|
struct amdgpu_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
|
|
struct i2c_msg *p;
|
|
int i, remaining, current_count, buffer_offset, max_bytes, ret;
|
|
u8 flags;
|
|
|
|
/* check for bus probe */
|
|
p = &msgs[0];
|
|
if ((num == 1) && (p->len == 0)) {
|
|
ret = amdgpu_atombios_i2c_process_i2c_ch(i2c,
|
|
p->addr, HW_I2C_WRITE,
|
|
NULL, 0);
|
|
if (ret)
|
|
return ret;
|
|
else
|
|
return num;
|
|
}
|
|
|
|
for (i = 0; i < num; i++) {
|
|
p = &msgs[i];
|
|
remaining = p->len;
|
|
buffer_offset = 0;
|
|
/* max_bytes are a limitation of ProcessI2cChannelTransaction not the hw */
|
|
if (p->flags & I2C_M_RD) {
|
|
max_bytes = ATOM_MAX_HW_I2C_READ;
|
|
flags = HW_I2C_READ;
|
|
} else {
|
|
max_bytes = ATOM_MAX_HW_I2C_WRITE;
|
|
flags = HW_I2C_WRITE;
|
|
}
|
|
while (remaining) {
|
|
if (remaining > max_bytes)
|
|
current_count = max_bytes;
|
|
else
|
|
current_count = remaining;
|
|
ret = amdgpu_atombios_i2c_process_i2c_ch(i2c,
|
|
p->addr, flags,
|
|
&p->buf[buffer_offset], current_count);
|
|
if (ret)
|
|
return ret;
|
|
remaining -= current_count;
|
|
buffer_offset += current_count;
|
|
}
|
|
}
|
|
|
|
return num;
|
|
}
|
|
|
|
u32 amdgpu_atombios_i2c_func(struct i2c_adapter *adap)
|
|
{
|
|
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
|
|
}
|
|
|