Line data Source code
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 : */
25 : #include <dev/pci/drm/drmP.h>
26 : #include <dev/pci/drm/radeon_drm.h>
27 : #include "radeon.h"
28 : #include "atom.h"
29 :
30 : #define TARGET_HW_I2C_CLOCK 50
31 :
32 : /* these are a limitation of ProcessI2cChannelTransaction not the hw */
33 : #define ATOM_MAX_HW_I2C_WRITE 3
34 : #define ATOM_MAX_HW_I2C_READ 255
35 :
36 0 : static int radeon_process_i2c_ch(struct radeon_i2c_chan *chan,
37 : u8 slave_addr, u8 flags,
38 : u8 *buf, u8 num)
39 : {
40 0 : struct drm_device *dev = chan->dev;
41 0 : struct radeon_device *rdev = dev->dev_private;
42 0 : PROCESS_I2C_CHANNEL_TRANSACTION_PS_ALLOCATION args;
43 : int index = GetIndexIntoMasterTable(COMMAND, ProcessI2cChannelTransaction);
44 : unsigned char *base;
45 0 : u16 out = cpu_to_le16(0);
46 : int r = 0;
47 :
48 0 : memset(&args, 0, sizeof(args));
49 :
50 0 : mutex_lock(&chan->mutex);
51 0 : mutex_lock(&rdev->mode_info.atom_context->scratch_mutex);
52 :
53 0 : base = (unsigned char *)rdev->mode_info.atom_context->scratch;
54 :
55 0 : if (flags & HW_I2C_WRITE) {
56 0 : if (num > ATOM_MAX_HW_I2C_WRITE) {
57 0 : DRM_ERROR("hw i2c: tried to write too many bytes (%d vs 3)\n", num);
58 : r = -EINVAL;
59 0 : goto done;
60 : }
61 0 : if (buf == NULL)
62 0 : args.ucRegIndex = 0;
63 : else
64 0 : args.ucRegIndex = buf[0];
65 0 : if (num)
66 0 : num--;
67 0 : if (num)
68 0 : memcpy(&out, &buf[1], num);
69 0 : args.lpI2CDataOut = cpu_to_le16(out);
70 0 : } else {
71 : #if 0
72 : /*
73 : * gcc 4.2 gives 'warning: comparison is always false
74 : * due to limited range of data type'
75 : */
76 : if (num > ATOM_MAX_HW_I2C_READ) {
77 : DRM_ERROR("hw i2c: tried to read too many bytes (%d vs 255)\n", num);
78 : r = -EINVAL;
79 : goto done;
80 : }
81 : #endif
82 0 : args.ucRegIndex = 0;
83 0 : args.lpI2CDataOut = 0;
84 : }
85 :
86 0 : args.ucFlag = flags;
87 0 : args.ucI2CSpeed = TARGET_HW_I2C_CLOCK;
88 0 : args.ucTransBytes = num;
89 0 : args.ucSlaveAddr = slave_addr << 1;
90 0 : args.ucLineNumber = chan->rec.i2c_id;
91 :
92 0 : atom_execute_table_scratch_unlocked(rdev->mode_info.atom_context, index, (uint32_t *)&args);
93 :
94 : /* error */
95 0 : if (args.ucStatus != HW_ASSISTED_I2C_STATUS_SUCCESS) {
96 : DRM_DEBUG_KMS("hw_i2c error\n");
97 : r = -EIO;
98 0 : goto done;
99 : }
100 :
101 0 : if (!(flags & HW_I2C_WRITE))
102 0 : radeon_atom_copy_swap(buf, base, num, false);
103 :
104 : done:
105 0 : mutex_unlock(&rdev->mode_info.atom_context->scratch_mutex);
106 0 : mutex_unlock(&chan->mutex);
107 :
108 0 : return r;
109 0 : }
110 :
111 0 : int radeon_atom_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
112 : struct i2c_msg *msgs, int num)
113 : {
114 0 : struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
115 : struct i2c_msg *p;
116 : int i, remaining, current_count, buffer_offset, max_bytes, ret;
117 : u8 flags;
118 :
119 : /* check for bus probe */
120 : p = &msgs[0];
121 0 : if ((num == 1) && (p->len == 0)) {
122 0 : ret = radeon_process_i2c_ch(i2c,
123 0 : p->addr, HW_I2C_WRITE,
124 : NULL, 0);
125 0 : if (ret)
126 0 : return ret;
127 : else
128 0 : return num;
129 : }
130 :
131 0 : for (i = 0; i < num; i++) {
132 0 : p = &msgs[i];
133 0 : remaining = p->len;
134 : buffer_offset = 0;
135 : /* max_bytes are a limitation of ProcessI2cChannelTransaction not the hw */
136 0 : if (p->flags & I2C_M_RD) {
137 : max_bytes = ATOM_MAX_HW_I2C_READ;
138 : flags = HW_I2C_READ;
139 0 : } else {
140 : max_bytes = ATOM_MAX_HW_I2C_WRITE;
141 : flags = HW_I2C_WRITE;
142 : }
143 0 : while (remaining) {
144 0 : if (remaining > max_bytes)
145 0 : current_count = max_bytes;
146 : else
147 : current_count = remaining;
148 0 : ret = radeon_process_i2c_ch(i2c,
149 0 : p->addr, flags,
150 0 : &p->buf[buffer_offset], current_count);
151 0 : if (ret)
152 0 : return ret;
153 0 : remaining -= current_count;
154 0 : buffer_offset += current_count;
155 : }
156 : }
157 :
158 0 : return num;
159 0 : }
160 :
161 0 : u32 radeon_atom_hw_i2c_func(struct i2c_adapter *adap)
162 : {
163 0 : return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
164 : }
165 :
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