GNU Linux-libre 6.7.9-gnu
[releases.git] / drivers / gpu / host1x / hw / syncpt_hw.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Tegra host1x Syncpoints
4  *
5  * Copyright (c) 2010-2013, NVIDIA Corporation.
6  */
7
8 #include <linux/io.h>
9
10 #include "../dev.h"
11 #include "../syncpt.h"
12
13 /*
14  * Write the current syncpoint value back to hw.
15  */
16 static void syncpt_restore(struct host1x_syncpt *sp)
17 {
18         u32 min = host1x_syncpt_read_min(sp);
19         struct host1x *host = sp->host;
20
21         host1x_sync_writel(host, min, HOST1X_SYNC_SYNCPT(sp->id));
22 }
23
24 /*
25  * Write the current waitbase value back to hw.
26  */
27 static void syncpt_restore_wait_base(struct host1x_syncpt *sp)
28 {
29 #if HOST1X_HW < 7
30         struct host1x *host = sp->host;
31
32         host1x_sync_writel(host, sp->base_val,
33                            HOST1X_SYNC_SYNCPT_BASE(sp->id));
34 #endif
35 }
36
37 /*
38  * Read waitbase value from hw.
39  */
40 static void syncpt_read_wait_base(struct host1x_syncpt *sp)
41 {
42 #if HOST1X_HW < 7
43         struct host1x *host = sp->host;
44
45         sp->base_val =
46                 host1x_sync_readl(host, HOST1X_SYNC_SYNCPT_BASE(sp->id));
47 #endif
48 }
49
50 /*
51  * Updates the last value read from hardware.
52  */
53 static u32 syncpt_load(struct host1x_syncpt *sp)
54 {
55         struct host1x *host = sp->host;
56         u32 old, live;
57
58         /* Loop in case there's a race writing to min_val */
59         do {
60                 old = host1x_syncpt_read_min(sp);
61                 live = host1x_sync_readl(host, HOST1X_SYNC_SYNCPT(sp->id));
62         } while ((u32)atomic_cmpxchg(&sp->min_val, old, live) != old);
63
64         if (!host1x_syncpt_check_max(sp, live))
65                 dev_err(host->dev, "%s failed: id=%u, min=%d, max=%d\n",
66                         __func__, sp->id, host1x_syncpt_read_min(sp),
67                         host1x_syncpt_read_max(sp));
68
69         return live;
70 }
71
72 /*
73  * Write a cpu syncpoint increment to the hardware, without touching
74  * the cache.
75  */
76 static int syncpt_cpu_incr(struct host1x_syncpt *sp)
77 {
78         struct host1x *host = sp->host;
79         u32 reg_offset = sp->id / 32;
80
81         if (!host1x_syncpt_client_managed(sp) &&
82             host1x_syncpt_idle(sp))
83                 return -EINVAL;
84
85         host1x_sync_writel(host, BIT(sp->id % 32),
86                            HOST1X_SYNC_SYNCPT_CPU_INCR(reg_offset));
87         wmb();
88
89         return 0;
90 }
91
92 /**
93  * syncpt_assign_to_channel() - Assign syncpoint to channel
94  * @sp: syncpoint
95  * @ch: channel
96  *
97  * On chips with the syncpoint protection feature (Tegra186+), assign @sp to
98  * @ch, preventing other channels from incrementing the syncpoints. If @ch is
99  * NULL, unassigns the syncpoint.
100  *
101  * On older chips, do nothing.
102  */
103 static void syncpt_assign_to_channel(struct host1x_syncpt *sp,
104                                   struct host1x_channel *ch)
105 {
106 #if HOST1X_HW >= 6
107         struct host1x *host = sp->host;
108
109         host1x_sync_writel(host,
110                            HOST1X_SYNC_SYNCPT_CH_APP_CH(ch ? ch->id : 0xff),
111                            HOST1X_SYNC_SYNCPT_CH_APP(sp->id));
112 #endif
113 }
114
115 /**
116  * syncpt_enable_protection() - Enable syncpoint protection
117  * @host: host1x instance
118  *
119  * On chips with the syncpoint protection feature (Tegra186+), enable this
120  * feature. On older chips, do nothing.
121  */
122 static void syncpt_enable_protection(struct host1x *host)
123 {
124 #if HOST1X_HW >= 6
125         if (!host->hv_regs)
126                 return;
127
128         host1x_hypervisor_writel(host, HOST1X_HV_SYNCPT_PROT_EN_CH_EN,
129                                  HOST1X_HV_SYNCPT_PROT_EN);
130 #endif
131 }
132
133 static const struct host1x_syncpt_ops host1x_syncpt_ops = {
134         .restore = syncpt_restore,
135         .restore_wait_base = syncpt_restore_wait_base,
136         .load_wait_base = syncpt_read_wait_base,
137         .load = syncpt_load,
138         .cpu_incr = syncpt_cpu_incr,
139         .assign_to_channel = syncpt_assign_to_channel,
140         .enable_protection = syncpt_enable_protection,
141 };