1 /* $NetBSD: i2c.h,v 1.3 2021/12/18 23:45:33 riastradh Exp $ */
2
3 /* SPDX-License-Identifier: MIT */
4 #ifndef __NVKM_I2C_H__
5 #define __NVKM_I2C_H__
6 #include <core/subdev.h>
7 #include <core/event.h>
8
9 #include <subdev/bios.h>
10 #include <subdev/bios/i2c.h>
11
12 struct nvkm_i2c_ntfy_req {
13 #define NVKM_I2C_PLUG 0x01
14 #define NVKM_I2C_UNPLUG 0x02
15 #define NVKM_I2C_IRQ 0x04
16 #define NVKM_I2C_DONE 0x08
17 #define NVKM_I2C_ANY 0x0f
18 u8 mask;
19 u8 port;
20 };
21
22 struct nvkm_i2c_ntfy_rep {
23 u8 mask;
24 };
25
26 struct nvkm_i2c_bus_probe {
27 struct i2c_board_info dev;
28 u8 udelay; /* set to 0 to use the standard delay */
29 };
30
31 struct nvkm_i2c_bus {
32 const struct nvkm_i2c_bus_func *func;
33 struct nvkm_i2c_pad *pad;
34 #define NVKM_I2C_BUS_CCB(n) /* 'n' is ccb index */ (n)
35 #define NVKM_I2C_BUS_EXT(n) /* 'n' is dcb external encoder type */ ((n) + 0x100)
36 #define NVKM_I2C_BUS_PRI /* ccb primary comm. port */ -1
37 #define NVKM_I2C_BUS_SEC /* ccb secondary comm. port */ -2
38 int id;
39
40 struct mutex mutex;
41 struct list_head head;
42 struct i2c_adapter i2c;
43 u8 enabled;
44 };
45
46 int nvkm_i2c_bus_acquire(struct nvkm_i2c_bus *);
47 void nvkm_i2c_bus_release(struct nvkm_i2c_bus *);
48 int nvkm_i2c_bus_probe(struct nvkm_i2c_bus *, const char *,
49 struct nvkm_i2c_bus_probe *,
50 bool (*)(struct nvkm_i2c_bus *,
51 struct i2c_board_info *, void *), void *);
52
53 struct nvkm_i2c_aux {
54 const struct nvkm_i2c_aux_func *func;
55 struct nvkm_i2c_pad *pad;
56 #define NVKM_I2C_AUX_CCB(n) /* 'n' is ccb index */ (n)
57 #define NVKM_I2C_AUX_EXT(n) /* 'n' is dcb external encoder type */ ((n) + 0x100)
58 int id;
59
60 struct mutex mutex;
61 struct list_head head;
62 struct i2c_adapter i2c;
63 u8 enabled;
64
65 u32 intr;
66 };
67
68 void nvkm_i2c_aux_monitor(struct nvkm_i2c_aux *, bool monitor);
69 int nvkm_i2c_aux_acquire(struct nvkm_i2c_aux *);
70 void nvkm_i2c_aux_release(struct nvkm_i2c_aux *);
71 int nvkm_i2c_aux_xfer(struct nvkm_i2c_aux *, bool retry, u8 type,
72 u32 addr, u8 *data, u8 *size);
73 int nvkm_i2c_aux_lnk_ctl(struct nvkm_i2c_aux *, int link_nr, int link_bw,
74 bool enhanced_framing);
75
76 struct nvkm_i2c {
77 const struct nvkm_i2c_func *func;
78 struct nvkm_subdev subdev;
79
80 struct list_head pad;
81 struct list_head bus;
82 struct list_head aux;
83
84 struct nvkm_event event;
85 };
86
87 struct nvkm_i2c_bus *nvkm_i2c_bus_find(struct nvkm_i2c *, int);
88 struct nvkm_i2c_aux *nvkm_i2c_aux_find(struct nvkm_i2c *, int);
89
90 int nv04_i2c_new(struct nvkm_device *, int, struct nvkm_i2c **);
91 int nv4e_i2c_new(struct nvkm_device *, int, struct nvkm_i2c **);
92 int nv50_i2c_new(struct nvkm_device *, int, struct nvkm_i2c **);
93 int g94_i2c_new(struct nvkm_device *, int, struct nvkm_i2c **);
94 int gf117_i2c_new(struct nvkm_device *, int, struct nvkm_i2c **);
95 int gf119_i2c_new(struct nvkm_device *, int, struct nvkm_i2c **);
96 int gk104_i2c_new(struct nvkm_device *, int, struct nvkm_i2c **);
97 int gm200_i2c_new(struct nvkm_device *, int, struct nvkm_i2c **);
98
99 static inline int
nvkm_rdi2cr(struct i2c_adapter * adap,u8 addr,u8 reg)100 nvkm_rdi2cr(struct i2c_adapter *adap, u8 addr, u8 reg)
101 {
102 u8 val;
103 struct i2c_msg msgs[] = {
104 { .addr = addr, .flags = 0, .len = 1, .buf = ® },
105 { .addr = addr, .flags = I2C_M_RD, .len = 1, .buf = &val },
106 };
107
108 int ret = i2c_transfer(adap, msgs, ARRAY_SIZE(msgs));
109 if (ret != 2)
110 return -EIO;
111
112 return val;
113 }
114
115 static inline int
nv_rd16i2cr(struct i2c_adapter * adap,u8 addr,u8 reg)116 nv_rd16i2cr(struct i2c_adapter *adap, u8 addr, u8 reg)
117 {
118 u8 val[2];
119 struct i2c_msg msgs[] = {
120 { .addr = addr, .flags = 0, .len = 1, .buf = ® },
121 { .addr = addr, .flags = I2C_M_RD, .len = 2, .buf = val },
122 };
123
124 int ret = i2c_transfer(adap, msgs, ARRAY_SIZE(msgs));
125 if (ret != 2)
126 return -EIO;
127
128 return val[0] << 8 | val[1];
129 }
130
131 static inline int
nvkm_wri2cr(struct i2c_adapter * adap,u8 addr,u8 reg,u8 val)132 nvkm_wri2cr(struct i2c_adapter *adap, u8 addr, u8 reg, u8 val)
133 {
134 u8 buf[2] = { reg, val };
135 struct i2c_msg msgs[] = {
136 { .addr = addr, .flags = 0, .len = 2, .buf = buf },
137 };
138
139 int ret = i2c_transfer(adap, msgs, ARRAY_SIZE(msgs));
140 if (ret != 1)
141 return -EIO;
142
143 return 0;
144 }
145
146 static inline int
nv_wr16i2cr(struct i2c_adapter * adap,u8 addr,u8 reg,u16 val)147 nv_wr16i2cr(struct i2c_adapter *adap, u8 addr, u8 reg, u16 val)
148 {
149 u8 buf[3] = { reg, val >> 8, val & 0xff};
150 struct i2c_msg msgs[] = {
151 { .addr = addr, .flags = 0, .len = 3, .buf = buf },
152 };
153
154 int ret = i2c_transfer(adap, msgs, ARRAY_SIZE(msgs));
155 if (ret != 1)
156 return -EIO;
157
158 return 0;
159 }
160
161 static inline bool
nvkm_probe_i2c(struct i2c_adapter * adap,u8 addr)162 nvkm_probe_i2c(struct i2c_adapter *adap, u8 addr)
163 {
164 return nvkm_rdi2cr(adap, addr, 0) >= 0;
165 }
166
167 static inline int
nvkm_rdaux(struct nvkm_i2c_aux * aux,u32 addr,u8 * data,u8 size)168 nvkm_rdaux(struct nvkm_i2c_aux *aux, u32 addr, u8 *data, u8 size)
169 {
170 const u8 xfer = size;
171 int ret = nvkm_i2c_aux_acquire(aux);
172 if (ret == 0) {
173 ret = nvkm_i2c_aux_xfer(aux, true, 9, addr, data, &size);
174 WARN_ON(!ret && size != xfer);
175 nvkm_i2c_aux_release(aux);
176 }
177 return ret;
178 }
179
180 static inline int
nvkm_wraux(struct nvkm_i2c_aux * aux,u32 addr,u8 * data,u8 size)181 nvkm_wraux(struct nvkm_i2c_aux *aux, u32 addr, u8 *data, u8 size)
182 {
183 int ret = nvkm_i2c_aux_acquire(aux);
184 if (ret == 0) {
185 ret = nvkm_i2c_aux_xfer(aux, true, 8, addr, data, &size);
186 nvkm_i2c_aux_release(aux);
187 }
188 return ret;
189 }
190 #endif
191