Terje Bergstrom | 7547168 | 2013-03-22 16:34:01 +0200 | [diff] [blame] | 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/io.h> |
| 20 | |
Thierry Reding | fc3be3e | 2013-10-09 10:32:54 +0200 | [diff] [blame] | 21 | #include "../dev.h" |
| 22 | #include "../syncpt.h" |
Terje Bergstrom | 7547168 | 2013-03-22 16:34:01 +0200 | [diff] [blame] | 23 | |
| 24 | /* |
| 25 | * Write the current syncpoint value back to hw. |
| 26 | */ |
| 27 | static void syncpt_restore(struct host1x_syncpt *sp) |
| 28 | { |
| 29 | struct host1x *host = sp->host; |
| 30 | int min = host1x_syncpt_read_min(sp); |
| 31 | host1x_sync_writel(host, min, HOST1X_SYNC_SYNCPT(sp->id)); |
| 32 | } |
| 33 | |
| 34 | /* |
| 35 | * Write the current waitbase value back to hw. |
| 36 | */ |
| 37 | static void syncpt_restore_wait_base(struct host1x_syncpt *sp) |
| 38 | { |
| 39 | struct host1x *host = sp->host; |
| 40 | host1x_sync_writel(host, sp->base_val, |
| 41 | HOST1X_SYNC_SYNCPT_BASE(sp->id)); |
| 42 | } |
| 43 | |
| 44 | /* |
| 45 | * Read waitbase value from hw. |
| 46 | */ |
| 47 | static void syncpt_read_wait_base(struct host1x_syncpt *sp) |
| 48 | { |
| 49 | struct host1x *host = sp->host; |
| 50 | sp->base_val = |
| 51 | host1x_sync_readl(host, HOST1X_SYNC_SYNCPT_BASE(sp->id)); |
| 52 | } |
| 53 | |
| 54 | /* |
| 55 | * Updates the last value read from hardware. |
| 56 | */ |
| 57 | static u32 syncpt_load(struct host1x_syncpt *sp) |
| 58 | { |
| 59 | struct host1x *host = sp->host; |
| 60 | u32 old, live; |
| 61 | |
| 62 | /* Loop in case there's a race writing to min_val */ |
| 63 | do { |
| 64 | old = host1x_syncpt_read_min(sp); |
| 65 | live = host1x_sync_readl(host, HOST1X_SYNC_SYNCPT(sp->id)); |
| 66 | } while ((u32)atomic_cmpxchg(&sp->min_val, old, live) != old); |
| 67 | |
| 68 | if (!host1x_syncpt_check_max(sp, live)) |
| 69 | dev_err(host->dev, "%s failed: id=%u, min=%d, max=%d\n", |
| 70 | __func__, sp->id, host1x_syncpt_read_min(sp), |
| 71 | host1x_syncpt_read_max(sp)); |
| 72 | |
| 73 | return live; |
| 74 | } |
| 75 | |
| 76 | /* |
| 77 | * Write a cpu syncpoint increment to the hardware, without touching |
| 78 | * the cache. |
| 79 | */ |
Arto Merilainen | ebae30b | 2013-05-29 13:26:08 +0300 | [diff] [blame] | 80 | static int syncpt_cpu_incr(struct host1x_syncpt *sp) |
Terje Bergstrom | 7547168 | 2013-03-22 16:34:01 +0200 | [diff] [blame] | 81 | { |
| 82 | struct host1x *host = sp->host; |
| 83 | u32 reg_offset = sp->id / 32; |
| 84 | |
| 85 | if (!host1x_syncpt_client_managed(sp) && |
Arto Merilainen | ebae30b | 2013-05-29 13:26:08 +0300 | [diff] [blame] | 86 | host1x_syncpt_idle(sp)) |
| 87 | return -EINVAL; |
Terje Bergstrom | 7547168 | 2013-03-22 16:34:01 +0200 | [diff] [blame] | 88 | host1x_sync_writel(host, BIT_MASK(sp->id), |
| 89 | HOST1X_SYNC_SYNCPT_CPU_INCR(reg_offset)); |
| 90 | wmb(); |
Arto Merilainen | ebae30b | 2013-05-29 13:26:08 +0300 | [diff] [blame] | 91 | |
| 92 | return 0; |
Terje Bergstrom | 7547168 | 2013-03-22 16:34:01 +0200 | [diff] [blame] | 93 | } |
| 94 | |
Terje Bergstrom | 6579324 | 2013-03-22 16:34:03 +0200 | [diff] [blame] | 95 | /* remove a wait pointed to by patch_addr */ |
| 96 | static int syncpt_patch_wait(struct host1x_syncpt *sp, void *patch_addr) |
| 97 | { |
| 98 | u32 override = host1x_class_host_wait_syncpt( |
| 99 | HOST1X_SYNCPT_RESERVED, 0); |
| 100 | |
| 101 | *((u32 *)patch_addr) = override; |
| 102 | return 0; |
| 103 | } |
| 104 | |
Terje Bergstrom | 7547168 | 2013-03-22 16:34:01 +0200 | [diff] [blame] | 105 | static const struct host1x_syncpt_ops host1x_syncpt_ops = { |
| 106 | .restore = syncpt_restore, |
| 107 | .restore_wait_base = syncpt_restore_wait_base, |
| 108 | .load_wait_base = syncpt_read_wait_base, |
| 109 | .load = syncpt_load, |
| 110 | .cpu_incr = syncpt_cpu_incr, |
Terje Bergstrom | 6579324 | 2013-03-22 16:34:03 +0200 | [diff] [blame] | 111 | .patch_wait = syncpt_patch_wait, |
Terje Bergstrom | 7547168 | 2013-03-22 16:34:01 +0200 | [diff] [blame] | 112 | }; |