mirror of https://gitee.com/openkylin/linux.git
113 lines
2.9 KiB
C
113 lines
2.9 KiB
C
/*
|
|
* Tegra host1x Syncpoints
|
|
*
|
|
* Copyright (c) 2010-2013, NVIDIA Corporation.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <linux/io.h>
|
|
|
|
#include "dev.h"
|
|
#include "syncpt.h"
|
|
|
|
/*
|
|
* Write the current syncpoint value back to hw.
|
|
*/
|
|
static void syncpt_restore(struct host1x_syncpt *sp)
|
|
{
|
|
struct host1x *host = sp->host;
|
|
int min = host1x_syncpt_read_min(sp);
|
|
host1x_sync_writel(host, min, HOST1X_SYNC_SYNCPT(sp->id));
|
|
}
|
|
|
|
/*
|
|
* Write the current waitbase value back to hw.
|
|
*/
|
|
static void syncpt_restore_wait_base(struct host1x_syncpt *sp)
|
|
{
|
|
struct host1x *host = sp->host;
|
|
host1x_sync_writel(host, sp->base_val,
|
|
HOST1X_SYNC_SYNCPT_BASE(sp->id));
|
|
}
|
|
|
|
/*
|
|
* Read waitbase value from hw.
|
|
*/
|
|
static void syncpt_read_wait_base(struct host1x_syncpt *sp)
|
|
{
|
|
struct host1x *host = sp->host;
|
|
sp->base_val =
|
|
host1x_sync_readl(host, HOST1X_SYNC_SYNCPT_BASE(sp->id));
|
|
}
|
|
|
|
/*
|
|
* Updates the last value read from hardware.
|
|
*/
|
|
static u32 syncpt_load(struct host1x_syncpt *sp)
|
|
{
|
|
struct host1x *host = sp->host;
|
|
u32 old, live;
|
|
|
|
/* Loop in case there's a race writing to min_val */
|
|
do {
|
|
old = host1x_syncpt_read_min(sp);
|
|
live = host1x_sync_readl(host, HOST1X_SYNC_SYNCPT(sp->id));
|
|
} while ((u32)atomic_cmpxchg(&sp->min_val, old, live) != old);
|
|
|
|
if (!host1x_syncpt_check_max(sp, live))
|
|
dev_err(host->dev, "%s failed: id=%u, min=%d, max=%d\n",
|
|
__func__, sp->id, host1x_syncpt_read_min(sp),
|
|
host1x_syncpt_read_max(sp));
|
|
|
|
return live;
|
|
}
|
|
|
|
/*
|
|
* Write a cpu syncpoint increment to the hardware, without touching
|
|
* the cache.
|
|
*/
|
|
static int syncpt_cpu_incr(struct host1x_syncpt *sp)
|
|
{
|
|
struct host1x *host = sp->host;
|
|
u32 reg_offset = sp->id / 32;
|
|
|
|
if (!host1x_syncpt_client_managed(sp) &&
|
|
host1x_syncpt_idle(sp))
|
|
return -EINVAL;
|
|
host1x_sync_writel(host, BIT_MASK(sp->id),
|
|
HOST1X_SYNC_SYNCPT_CPU_INCR(reg_offset));
|
|
wmb();
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* remove a wait pointed to by patch_addr */
|
|
static int syncpt_patch_wait(struct host1x_syncpt *sp, void *patch_addr)
|
|
{
|
|
u32 override = host1x_class_host_wait_syncpt(
|
|
HOST1X_SYNCPT_RESERVED, 0);
|
|
|
|
*((u32 *)patch_addr) = override;
|
|
return 0;
|
|
}
|
|
|
|
static const struct host1x_syncpt_ops host1x_syncpt_ops = {
|
|
.restore = syncpt_restore,
|
|
.restore_wait_base = syncpt_restore_wait_base,
|
|
.load_wait_base = syncpt_read_wait_base,
|
|
.load = syncpt_load,
|
|
.cpu_incr = syncpt_cpu_incr,
|
|
.patch_wait = syncpt_patch_wait,
|
|
};
|