1 /*
2 * Copyright 2015 Red Hat 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 busions 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: Ben Skeggs <bskeggs@redhat.com>
23 */
24 #define gm200_i2c_aux(p) container_of((p), struct gm200_i2c_aux, base)
25 #include "aux.h"
26
27 struct gm200_i2c_aux {
28 struct nvkm_i2c_aux base;
29 int ch;
30 };
31
32 static void
gm200_i2c_aux_fini(struct gm200_i2c_aux * aux)33 gm200_i2c_aux_fini(struct gm200_i2c_aux *aux)
34 {
35 struct nvkm_device *device = aux->base.pad->i2c->subdev.device;
36 nvkm_mask(device, 0x00d954 + (aux->ch * 0x50), 0x00710000, 0x00000000);
37 }
38
39 static int
gm200_i2c_aux_init(struct gm200_i2c_aux * aux)40 gm200_i2c_aux_init(struct gm200_i2c_aux *aux)
41 {
42 struct nvkm_device *device = aux->base.pad->i2c->subdev.device;
43 const u32 unksel = 1; /* nfi which to use, or if it matters.. */
44 const u32 ureq = unksel ? 0x00100000 : 0x00200000;
45 const u32 urep = unksel ? 0x01000000 : 0x02000000;
46 u32 ctrl, timeout;
47
48 /* wait up to 1ms for any previous transaction to be done... */
49 timeout = 1000;
50 do {
51 ctrl = nvkm_rd32(device, 0x00d954 + (aux->ch * 0x50));
52 udelay(1);
53 if (!timeout--) {
54 AUX_ERR(&aux->base, "begin idle timeout %08x", ctrl);
55 return -EBUSY;
56 }
57 } while (ctrl & 0x07010000);
58
59 /* set some magic, and wait up to 1ms for it to appear */
60 nvkm_mask(device, 0x00d954 + (aux->ch * 0x50), 0x00700000, ureq);
61 timeout = 1000;
62 do {
63 ctrl = nvkm_rd32(device, 0x00d954 + (aux->ch * 0x50));
64 udelay(1);
65 if (!timeout--) {
66 AUX_ERR(&aux->base, "magic wait %08x", ctrl);
67 gm200_i2c_aux_fini(aux);
68 return -EBUSY;
69 }
70 } while ((ctrl & 0x07000000) != urep);
71
72 return 0;
73 }
74
75 static int
gm200_i2c_aux_xfer(struct nvkm_i2c_aux * obj,bool retry,u8 type,u32 addr,u8 * data,u8 * size)76 gm200_i2c_aux_xfer(struct nvkm_i2c_aux *obj, bool retry,
77 u8 type, u32 addr, u8 *data, u8 *size)
78 {
79 struct gm200_i2c_aux *aux = gm200_i2c_aux(obj);
80 struct nvkm_i2c *i2c = aux->base.pad->i2c;
81 struct nvkm_device *device = i2c->subdev.device;
82 const u32 base = aux->ch * 0x50;
83 u32 ctrl, stat, timeout, retries = 0;
84 u32 xbuf[4] = {};
85 int ret, i;
86
87 AUX_TRACE(&aux->base, "%d: %08x %d", type, addr, *size);
88
89 ret = gm200_i2c_aux_init(aux);
90 if (ret < 0)
91 goto out;
92
93 stat = nvkm_rd32(device, 0x00d958 + base);
94 if (!(stat & 0x10000000)) {
95 AUX_TRACE(&aux->base, "sink not detected");
96 ret = -ENXIO;
97 goto out;
98 }
99
100 nvkm_i2c_aux_autodpcd(i2c, aux->ch, false);
101
102 if (!(type & 1)) {
103 memcpy(xbuf, data, *size);
104 for (i = 0; i < 16; i += 4) {
105 AUX_TRACE(&aux->base, "wr %08x", xbuf[i / 4]);
106 nvkm_wr32(device, 0x00d930 + base + i, xbuf[i / 4]);
107 }
108 }
109
110 ctrl = nvkm_rd32(device, 0x00d954 + base);
111 ctrl &= ~0x0001f1ff;
112 ctrl |= type << 12;
113 ctrl |= (*size ? (*size - 1) : 0x00000100);
114 nvkm_wr32(device, 0x00d950 + base, addr);
115
116 /* (maybe) retry transaction a number of times on failure... */
117 do {
118 /* reset, and delay a while if this is a retry */
119 nvkm_wr32(device, 0x00d954 + base, 0x80000000 | ctrl);
120 nvkm_wr32(device, 0x00d954 + base, 0x00000000 | ctrl);
121 if (retries)
122 udelay(400);
123
124 /* transaction request, wait up to 2ms for it to complete */
125 nvkm_wr32(device, 0x00d954 + base, 0x00010000 | ctrl);
126
127 timeout = 2000;
128 do {
129 ctrl = nvkm_rd32(device, 0x00d954 + base);
130 udelay(1);
131 if (!timeout--) {
132 AUX_ERR(&aux->base, "timeout %08x", ctrl);
133 ret = -EIO;
134 goto out_err;
135 }
136 } while (ctrl & 0x00010000);
137 ret = 0;
138
139 /* read status, and check if transaction completed ok */
140 stat = nvkm_mask(device, 0x00d958 + base, 0, 0);
141 if ((stat & 0x000f0000) == 0x00080000 ||
142 (stat & 0x000f0000) == 0x00020000)
143 ret = 1;
144 if ((stat & 0x00000100))
145 ret = -ETIMEDOUT;
146 if ((stat & 0x00000e00))
147 ret = -EIO;
148
149 AUX_TRACE(&aux->base, "%02d %08x %08x", retries, ctrl, stat);
150 } while (ret && retry && retries++ < 32);
151
152 if (type & 1) {
153 for (i = 0; i < 16; i += 4) {
154 xbuf[i / 4] = nvkm_rd32(device, 0x00d940 + base + i);
155 AUX_TRACE(&aux->base, "rd %08x", xbuf[i / 4]);
156 }
157 memcpy(data, xbuf, *size);
158 *size = stat & 0x0000001f;
159 }
160
161 out_err:
162 nvkm_i2c_aux_autodpcd(i2c, aux->ch, true);
163 out:
164 gm200_i2c_aux_fini(aux);
165 return ret < 0 ? ret : (stat & 0x000f0000) >> 16;
166 }
167
168 static const struct nvkm_i2c_aux_func
169 gm200_i2c_aux_func = {
170 .address_only = true,
171 .xfer = gm200_i2c_aux_xfer,
172 };
173
174 int
gm200_i2c_aux_new(struct nvkm_i2c_pad * pad,int index,u8 drive,struct nvkm_i2c_aux ** paux)175 gm200_i2c_aux_new(struct nvkm_i2c_pad *pad, int index, u8 drive,
176 struct nvkm_i2c_aux **paux)
177 {
178 struct gm200_i2c_aux *aux;
179
180 if (!(aux = kzalloc(sizeof(*aux), GFP_KERNEL)))
181 return -ENOMEM;
182 *paux = &aux->base;
183
184 nvkm_i2c_aux_ctor(&gm200_i2c_aux_func, pad, index, &aux->base);
185 aux->ch = drive;
186 aux->base.intr = 1 << aux->ch;
187 return 0;
188 }
189