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1/*
2 * Copyright(c) 2011-2016 Intel Corporation. All rights reserved.
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 (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 * SOFTWARE.
22 *
23 * Authors:
24 * Ke Yu
25 * Zhiyuan Lv <zhiyuan.lv@intel.com>
26 *
27 * Contributors:
28 * Terrence Xu <terrence.xu@intel.com>
29 * Changbin Du <changbin.du@intel.com>
30 * Bing Niu <bing.niu@intel.com>
31 * Zhi Wang <zhi.a.wang@intel.com>
32 *
33 */
34
35#ifndef _GVT_EDID_H_
36#define _GVT_EDID_H_
37
38#define EDID_SIZE 128
39#define EDID_ADDR 0x50 /* Linux hvm EDID addr */
40
41#define GVT_AUX_NATIVE_WRITE 0x8
42#define GVT_AUX_NATIVE_READ 0x9
43#define GVT_AUX_I2C_WRITE 0x0
44#define GVT_AUX_I2C_READ 0x1
45#define GVT_AUX_I2C_STATUS 0x2
46#define GVT_AUX_I2C_MOT 0x4
47#define GVT_AUX_I2C_REPLY_ACK 0x0
48
49struct intel_vgpu_edid_data {
50 bool data_valid;
51 unsigned char edid_block[EDID_SIZE];
52};
53
54enum gmbus_cycle_type {
55 GMBUS_NOCYCLE = 0x0,
56 NIDX_NS_W = 0x1,
57 IDX_NS_W = 0x3,
58 GMBUS_STOP = 0x4,
59 NIDX_STOP = 0x5,
60 IDX_STOP = 0x7
61};
62
63/*
64 * States of GMBUS
65 *
66 * GMBUS0-3 could be related to the EDID virtualization. Another two GMBUS
67 * registers, GMBUS4 (interrupt mask) and GMBUS5 (2 byte indes register), are
68 * not considered here. Below describes the usage of GMBUS registers that are
69 * cared by the EDID virtualization
70 *
71 * GMBUS0:
72 * R/W
73 * port selection. value of bit0 - bit2 corresponds to the GPIO registers.
74 *
75 * GMBUS1:
76 * R/W Protect
77 * Command and Status.
78 * bit0 is the direction bit: 1 is read; 0 is write.
79 * bit1 - bit7 is slave 7-bit address.
80 * bit16 - bit24 total byte count (ignore?)
81 *
82 * GMBUS2:
83 * Most of bits are read only except bit 15 (IN_USE)
84 * Status register
85 * bit0 - bit8 current byte count
86 * bit 11: hardware ready;
87 *
88 * GMBUS3:
89 * Read/Write
90 * Data for transfer
91 */
92
93/* From hw specs, Other phases like START, ADDRESS, INDEX
94 * are invisible to GMBUS MMIO interface. So no definitions
95 * in below enum types
96 */
97enum gvt_gmbus_phase {
98 GMBUS_IDLE_PHASE = 0,
99 GMBUS_DATA_PHASE,
100 GMBUS_WAIT_PHASE,
101 //GMBUS_STOP_PHASE,
102 GMBUS_MAX_PHASE
103};
104
105struct intel_vgpu_i2c_gmbus {
106 unsigned int total_byte_count; /* from GMBUS1 */
107 enum gmbus_cycle_type cycle_type;
108 enum gvt_gmbus_phase phase;
109};
110
111struct intel_vgpu_i2c_aux_ch {
112 bool i2c_over_aux_ch;
113 bool aux_ch_mot;
114};
115
116enum i2c_state {
117 I2C_NOT_SPECIFIED = 0,
118 I2C_GMBUS = 1,
119 I2C_AUX_CH = 2
120};
121
122/* I2C sequences cannot interleave.
123 * GMBUS and AUX_CH sequences cannot interleave.
124 */
125struct intel_vgpu_i2c_edid {
126 enum i2c_state state;
127
128 unsigned int port;
129 bool slave_selected;
130 bool edid_available;
131 unsigned int current_edid_read;
132
133 struct intel_vgpu_i2c_gmbus gmbus;
134 struct intel_vgpu_i2c_aux_ch aux_ch;
135};
136
137void intel_vgpu_init_i2c_edid(struct intel_vgpu *vgpu);
138
139int intel_gvt_i2c_handle_gmbus_read(struct intel_vgpu *vgpu,
140 unsigned int offset, void *p_data, unsigned int bytes);
141
142int intel_gvt_i2c_handle_gmbus_write(struct intel_vgpu *vgpu,
143 unsigned int offset, void *p_data, unsigned int bytes);
144
145void intel_gvt_i2c_handle_aux_ch_write(struct intel_vgpu *vgpu,
146 int port_idx,
147 unsigned int offset,
148 void *p_data);
149
150#endif /*_GVT_EDID_H_*/