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 g94_i2c_aux(p) container_of((p), struct g94_i2c_aux, base)
25 #include "aux.h"
26
27 struct g94_i2c_aux {
28 struct nvkm_i2c_aux base;
29 int ch;
30 };
31
32 static void
g94_i2c_aux_fini(struct g94_i2c_aux * aux)33 g94_i2c_aux_fini(struct g94_i2c_aux *aux)
34 {
35 struct nvkm_device *device = aux->base.pad->i2c->subdev.device;
36 nvkm_mask(device, 0x00e4e4 + (aux->ch * 0x50), 0x00310000, 0x00000000);
37 }
38
39 static int
g94_i2c_aux_init(struct g94_i2c_aux * aux)40 g94_i2c_aux_init(struct g94_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, 0x00e4e4 + (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 & 0x03010000);
58
59 /* set some magic, and wait up to 1ms for it to appear */
60 nvkm_mask(device, 0x00e4e4 + (aux->ch * 0x50), 0x00300000, ureq);
61 timeout = 1000;
62 do {
63 ctrl = nvkm_rd32(device, 0x00e4e4 + (aux->ch * 0x50));
64 udelay(1);
65 if (!timeout--) {
66 AUX_ERR(&aux->base, "magic wait %08x", ctrl);
67 g94_i2c_aux_fini(aux);
68 return -EBUSY;
69 }
70 } while ((ctrl & 0x03000000) != urep);
71
72 return 0;
73 }
74
75 static int
g94_i2c_aux_xfer(struct nvkm_i2c_aux * obj,bool retry,u8 type,u32 addr,u8 * data,u8 size)76 g94_i2c_aux_xfer(struct nvkm_i2c_aux *obj, bool retry,
77 u8 type, u32 addr, u8 *data, u8 size)
78 {
79 struct g94_i2c_aux *aux = g94_i2c_aux(obj);
80 struct nvkm_device *device = aux->base.pad->i2c->subdev.device;
81 const u32 base = aux->ch * 0x50;
82 u32 ctrl, stat, timeout, retries;
83 u32 xbuf[4] = {};
84 int ret, i;
85
86 AUX_TRACE(&aux->base, "%d: %08x %d", type, addr, size);
87
88 ret = g94_i2c_aux_init(aux);
89 if (ret < 0)
90 goto out;
91
92 stat = nvkm_rd32(device, 0x00e4e8 + base);
93 if (!(stat & 0x10000000)) {
94 AUX_TRACE(&aux->base, "sink not detected");
95 ret = -ENXIO;
96 goto out;
97 }
98
99 if (!(type & 1)) {
100 memcpy(xbuf, data, size);
101 for (i = 0; i < 16; i += 4) {
102 AUX_TRACE(&aux->base, "wr %08x", xbuf[i / 4]);
103 nvkm_wr32(device, 0x00e4c0 + base + i, xbuf[i / 4]);
104 }
105 }
106
107 ctrl = nvkm_rd32(device, 0x00e4e4 + base);
108 ctrl &= ~0x0001f0ff;
109 ctrl |= type << 12;
110 ctrl |= size - 1;
111 nvkm_wr32(device, 0x00e4e0 + base, addr);
112
113 /* (maybe) retry transaction a number of times on failure... */
114 for (retries = 0; !ret && retries < 32; retries++) {
115 /* reset, and delay a while if this is a retry */
116 nvkm_wr32(device, 0x00e4e4 + base, 0x80000000 | ctrl);
117 nvkm_wr32(device, 0x00e4e4 + base, 0x00000000 | ctrl);
118 if (retries)
119 udelay(400);
120
121 /* transaction request, wait up to 1ms for it to complete */
122 nvkm_wr32(device, 0x00e4e4 + base, 0x00010000 | ctrl);
123
124 timeout = 1000;
125 do {
126 ctrl = nvkm_rd32(device, 0x00e4e4 + base);
127 udelay(1);
128 if (!timeout--) {
129 AUX_ERR(&aux->base, "timeout %08x", ctrl);
130 ret = -EIO;
131 goto out;
132 }
133 } while (ctrl & 0x00010000);
134 ret = 1;
135
136 /* read status, and check if transaction completed ok */
137 stat = nvkm_mask(device, 0x00e4e8 + base, 0, 0);
138 if ((stat & 0x000f0000) == 0x00080000 ||
139 (stat & 0x000f0000) == 0x00020000)
140 ret = retry ? 0 : 1;
141 if ((stat & 0x00000100))
142 ret = -ETIMEDOUT;
143 if ((stat & 0x00000e00))
144 ret = -EIO;
145
146 AUX_TRACE(&aux->base, "%02d %08x %08x", retries, ctrl, stat);
147 }
148
149 if (type & 1) {
150 for (i = 0; i < 16; i += 4) {
151 xbuf[i / 4] = nvkm_rd32(device, 0x00e4d0 + base + i);
152 AUX_TRACE(&aux->base, "rd %08x", xbuf[i / 4]);
153 }
154 memcpy(data, xbuf, size);
155 }
156
157 out:
158 g94_i2c_aux_fini(aux);
159 return ret < 0 ? ret : (stat & 0x000f0000) >> 16;
160 }
161
162 static const struct nvkm_i2c_aux_func
163 g94_i2c_aux_func = {
164 .xfer = g94_i2c_aux_xfer,
165 };
166
167 int
g94_i2c_aux_new(struct nvkm_i2c_pad * pad,int index,u8 drive,struct nvkm_i2c_aux ** paux)168 g94_i2c_aux_new(struct nvkm_i2c_pad *pad, int index, u8 drive,
169 struct nvkm_i2c_aux **paux)
170 {
171 struct g94_i2c_aux *aux;
172
173 if (!(aux = kzalloc(sizeof(*aux), GFP_KERNEL)))
174 return -ENOMEM;
175 *paux = &aux->base;
176
177 nvkm_i2c_aux_ctor(&g94_i2c_aux_func, pad, index, &aux->base);
178 aux->ch = drive;
179 aux->base.intr = 1 << aux->ch;
180 return 0;
181 }
182