[mirror_ubuntu-kernels.git] / drivers / gpu / drm / amd / amdgpu / atombios_i2c.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/amdgpu_drm.h>
#include "amdgpu.h"
#include "atom.h"
#include "amdgpu_atombios.h"
#include "atombios_i2c.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) {
			if (buf) {
				memcpy(&out, &buf[1], num);
			} else {
				DRM_ERROR("hw i2c: missing buf with num > 1\n");
				r = -EINVAL;
				goto done;
			}
		}
		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;
}

void amdgpu_atombios_i2c_channel_trans(struct amdgpu_device* adev, u8 slave_addr, u8 line_number, u8 offset, u8 data)
{
	PROCESS_I2C_CHANNEL_TRANSACTION_PS_ALLOCATION args;
	int index = GetIndexIntoMasterTable(COMMAND, ProcessI2cChannelTransaction);

	args.ucRegIndex = offset;
	args.lpI2CDataOut = data;
	args.ucFlag = 1;
	args.ucI2CSpeed = TARGET_HW_I2C_CLOCK;
	args.ucTransBytes = 1;
	args.ucSlaveAddr = slave_addr;
	args.ucLineNumber = line_number;

	amdgpu_atom_execute_table(adev->mode_info.atom_context, index, (uint32_t *)&args);
}
Commit	Line	Data
d38ceaf9 AD	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	*/
47b757fb	25
d38ceaf9 AD	26	#include <drm/amdgpu_drm.h>
	27	#include "amdgpu.h"
	28	#include "atom.h"
	29	#include "amdgpu_atombios.h"
9ca91fdd	30	#include "atombios_i2c.h"
d38ceaf9 AD	31
	32	#define TARGET_HW_I2C_CLOCK 50
	33
	34	/* these are a limitation of ProcessI2cChannelTransaction not the hw */
	35	#define ATOM_MAX_HW_I2C_WRITE 3
	36	#define ATOM_MAX_HW_I2C_READ 255
	37
	38	static int amdgpu_atombios_i2c_process_i2c_ch(struct amdgpu_i2c_chan *chan,
	39	u8 slave_addr, u8 flags,
	40	u8 *buf, u8 num)
	41	{
	42	struct drm_device *dev = chan->dev;
	43	struct amdgpu_device *adev = dev->dev_private;
	44	PROCESS_I2C_CHANNEL_TRANSACTION_PS_ALLOCATION args;
	45	int index = GetIndexIntoMasterTable(COMMAND, ProcessI2cChannelTransaction);
	46	unsigned char *base;
	47	u16 out = cpu_to_le16(0);
	48	int r = 0;
	49
	50	memset(&args, 0, sizeof(args));
	51
	52	mutex_lock(&chan->mutex);
	53
	54	base = (unsigned char *)adev->mode_info.atom_context->scratch;
	55
	56	if (flags & HW_I2C_WRITE) {
	57	if (num > ATOM_MAX_HW_I2C_WRITE) {
	58	DRM_ERROR("hw i2c: tried to write too many bytes (%d vs 3)\n", num);
	59	r = -EINVAL;
	60	goto done;
	61	}
	62	if (buf == NULL)
	63	args.ucRegIndex = 0;
	64	else
	65	args.ucRegIndex = buf[0];
	66	if (num)
	67	num--;
7d033100 ES	68	if (num) {
	69	if (buf) {
	70	memcpy(&out, &buf[1], num);
	71	} else {
	72	DRM_ERROR("hw i2c: missing buf with num > 1\n");
	73	r = -EINVAL;
	74	goto done;
	75	}
	76	}
d38ceaf9 AD	77	args.lpI2CDataOut = cpu_to_le16(out);
	78	} else {
	79	if (num > ATOM_MAX_HW_I2C_READ) {
	80	DRM_ERROR("hw i2c: tried to read too many bytes (%d vs 255)\n", num);
	81	r = -EINVAL;
	82	goto done;
	83	}
	84	args.ucRegIndex = 0;
	85	args.lpI2CDataOut = 0;
	86	}
	87
	88	args.ucFlag = flags;
	89	args.ucI2CSpeed = TARGET_HW_I2C_CLOCK;
	90	args.ucTransBytes = num;
	91	args.ucSlaveAddr = slave_addr << 1;
	92	args.ucLineNumber = chan->rec.i2c_id;
	93
	94	amdgpu_atom_execute_table(adev->mode_info.atom_context, index, (uint32_t *)&args);
	95
	96	/* error */
	97	if (args.ucStatus != HW_ASSISTED_I2C_STATUS_SUCCESS) {
	98	DRM_DEBUG_KMS("hw_i2c error\n");
	99	r = -EIO;
	100	goto done;
	101	}
	102
	103	if (!(flags & HW_I2C_WRITE))
	104	amdgpu_atombios_copy_swap(buf, base, num, false);
	105
	106	done:
	107	mutex_unlock(&chan->mutex);
	108
	109	return r;
	110	}
	111
	112	int amdgpu_atombios_i2c_xfer(struct i2c_adapter *i2c_adap,
	113	struct i2c_msg *msgs, int num)
	114	{
	115	struct amdgpu_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
	116	struct i2c_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 = amdgpu_atombios_i2c_process_i2c_ch(i2c,
	124	p->addr, HW_I2C_WRITE,
	125	NULL, 0);
	126	if (ret)
	127	return ret;
	128	else
	129	return num;
	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 & I2C_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 = amdgpu_atombios_i2c_process_i2c_ch(i2c,
150	p->addr, 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 num;
160	}
161
162	u32 amdgpu_atombios_i2c_func(struct i2c_adapter *adap)
163	{
164	return I2C_FUNC_I2C \| I2C_FUNC_SMBUS_EMUL;
165	}
166
eeade25a KW	167	void amdgpu_atombios_i2c_channel_trans(struct amdgpu_device* adev, u8 slave_addr, u8 line_number, u8 offset, u8 data)
	168	{
	169	PROCESS_I2C_CHANNEL_TRANSACTION_PS_ALLOCATION args;
	170	int index = GetIndexIntoMasterTable(COMMAND, ProcessI2cChannelTransaction);
	171
	172	args.ucRegIndex = offset;
	173	args.lpI2CDataOut = data;
	174	args.ucFlag = 1;
	175	args.ucI2CSpeed = TARGET_HW_I2C_CLOCK;
	176	args.ucTransBytes = 1;
	177	args.ucSlaveAddr = slave_addr;
	178	args.ucLineNumber = line_number;
	179
	180	amdgpu_atom_execute_table(adev->mode_info.atom_context, index, (uint32_t *)&args);
	181	}