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75471687 TB |
1 | /* |
2 | * Tegra host1x Syncpoints | |
3 | * | |
4 | * Copyright (c) 2010-2013, NVIDIA Corporation. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms and conditions of the GNU General Public License, | |
8 | * version 2, as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
17 | */ | |
18 | ||
19 | #include <linux/module.h> | |
20 | #include <linux/device.h> | |
21 | #include <linux/slab.h> | |
22 | ||
23 | #include <trace/events/host1x.h> | |
24 | ||
25 | #include "syncpt.h" | |
26 | #include "dev.h" | |
27 | ||
28 | static struct host1x_syncpt *_host1x_syncpt_alloc(struct host1x *host, | |
29 | struct device *dev, | |
30 | int client_managed) | |
31 | { | |
32 | int i; | |
33 | struct host1x_syncpt *sp = host->syncpt; | |
34 | char *name; | |
35 | ||
36 | for (i = 0; i < host->info->nb_pts && sp->name; i++, sp++) | |
37 | ; | |
38 | if (sp->dev) | |
39 | return NULL; | |
40 | ||
41 | name = kasprintf(GFP_KERNEL, "%02d-%s", sp->id, | |
42 | dev ? dev_name(dev) : NULL); | |
43 | if (!name) | |
44 | return NULL; | |
45 | ||
46 | sp->dev = dev; | |
47 | sp->name = name; | |
48 | sp->client_managed = client_managed; | |
49 | ||
50 | return sp; | |
51 | } | |
52 | ||
53 | u32 host1x_syncpt_id(struct host1x_syncpt *sp) | |
54 | { | |
55 | return sp->id; | |
56 | } | |
57 | ||
58 | /* | |
59 | * Updates the value sent to hardware. | |
60 | */ | |
61 | u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs) | |
62 | { | |
63 | return (u32)atomic_add_return(incrs, &sp->max_val); | |
64 | } | |
65 | ||
66 | /* | |
67 | * Write cached syncpoint and waitbase values to hardware. | |
68 | */ | |
69 | void host1x_syncpt_restore(struct host1x *host) | |
70 | { | |
71 | struct host1x_syncpt *sp_base = host->syncpt; | |
72 | u32 i; | |
73 | ||
74 | for (i = 0; i < host1x_syncpt_nb_pts(host); i++) | |
75 | host1x_hw_syncpt_restore(host, sp_base + i); | |
76 | for (i = 0; i < host1x_syncpt_nb_bases(host); i++) | |
77 | host1x_hw_syncpt_restore_wait_base(host, sp_base + i); | |
78 | wmb(); | |
79 | } | |
80 | ||
81 | /* | |
82 | * Update the cached syncpoint and waitbase values by reading them | |
83 | * from the registers. | |
84 | */ | |
85 | void host1x_syncpt_save(struct host1x *host) | |
86 | { | |
87 | struct host1x_syncpt *sp_base = host->syncpt; | |
88 | u32 i; | |
89 | ||
90 | for (i = 0; i < host1x_syncpt_nb_pts(host); i++) { | |
91 | if (host1x_syncpt_client_managed(sp_base + i)) | |
92 | host1x_hw_syncpt_load(host, sp_base + i); | |
93 | else | |
94 | WARN_ON(!host1x_syncpt_idle(sp_base + i)); | |
95 | } | |
96 | ||
97 | for (i = 0; i < host1x_syncpt_nb_bases(host); i++) | |
98 | host1x_hw_syncpt_load_wait_base(host, sp_base + i); | |
99 | } | |
100 | ||
101 | /* | |
102 | * Updates the cached syncpoint value by reading a new value from the hardware | |
103 | * register | |
104 | */ | |
105 | u32 host1x_syncpt_load(struct host1x_syncpt *sp) | |
106 | { | |
107 | u32 val; | |
108 | val = host1x_hw_syncpt_load(sp->host, sp); | |
109 | trace_host1x_syncpt_load_min(sp->id, val); | |
110 | ||
111 | return val; | |
112 | } | |
113 | ||
114 | /* | |
115 | * Get the current syncpoint base | |
116 | */ | |
117 | u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp) | |
118 | { | |
119 | u32 val; | |
120 | host1x_hw_syncpt_load_wait_base(sp->host, sp); | |
121 | val = sp->base_val; | |
122 | return val; | |
123 | } | |
124 | ||
125 | /* | |
126 | * Write a cpu syncpoint increment to the hardware, without touching | |
127 | * the cache. Caller is responsible for host being powered. | |
128 | */ | |
129 | void host1x_syncpt_cpu_incr(struct host1x_syncpt *sp) | |
130 | { | |
131 | host1x_hw_syncpt_cpu_incr(sp->host, sp); | |
132 | } | |
133 | ||
134 | /* | |
135 | * Increment syncpoint value from cpu, updating cache | |
136 | */ | |
137 | void host1x_syncpt_incr(struct host1x_syncpt *sp) | |
138 | { | |
139 | if (host1x_syncpt_client_managed(sp)) | |
140 | host1x_syncpt_incr_max(sp, 1); | |
141 | host1x_syncpt_cpu_incr(sp); | |
142 | } | |
143 | ||
144 | int host1x_syncpt_init(struct host1x *host) | |
145 | { | |
146 | struct host1x_syncpt *syncpt; | |
147 | int i; | |
148 | ||
149 | syncpt = devm_kzalloc(host->dev, sizeof(*syncpt) * host->info->nb_pts, | |
150 | GFP_KERNEL); | |
151 | if (!syncpt) | |
152 | return -ENOMEM; | |
153 | ||
154 | for (i = 0; i < host->info->nb_pts; ++i) { | |
155 | syncpt[i].id = i; | |
156 | syncpt[i].host = host; | |
157 | } | |
158 | ||
159 | host->syncpt = syncpt; | |
160 | ||
161 | host1x_syncpt_restore(host); | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
166 | struct host1x_syncpt *host1x_syncpt_request(struct device *dev, | |
167 | int client_managed) | |
168 | { | |
169 | struct host1x *host = dev_get_drvdata(dev->parent); | |
170 | return _host1x_syncpt_alloc(host, dev, client_managed); | |
171 | } | |
172 | ||
173 | void host1x_syncpt_free(struct host1x_syncpt *sp) | |
174 | { | |
175 | if (!sp) | |
176 | return; | |
177 | ||
178 | kfree(sp->name); | |
179 | sp->dev = NULL; | |
180 | sp->name = NULL; | |
181 | sp->client_managed = 0; | |
182 | } | |
183 | ||
184 | void host1x_syncpt_deinit(struct host1x *host) | |
185 | { | |
186 | int i; | |
187 | struct host1x_syncpt *sp = host->syncpt; | |
188 | for (i = 0; i < host->info->nb_pts; i++, sp++) | |
189 | kfree(sp->name); | |
190 | } | |
191 | ||
192 | int host1x_syncpt_nb_pts(struct host1x *host) | |
193 | { | |
194 | return host->info->nb_pts; | |
195 | } | |
196 | ||
197 | int host1x_syncpt_nb_bases(struct host1x *host) | |
198 | { | |
199 | return host->info->nb_bases; | |
200 | } | |
201 | ||
202 | int host1x_syncpt_nb_mlocks(struct host1x *host) | |
203 | { | |
204 | return host->info->nb_mlocks; | |
205 | } | |
206 | ||
207 | struct host1x_syncpt *host1x_syncpt_get(struct host1x *host, u32 id) | |
208 | { | |
209 | if (host->info->nb_pts < id) | |
210 | return NULL; | |
211 | return host->syncpt + id; | |
212 | } |