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/*
* 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/>.
*/
#ifndef __HOST1X_SYNCPT_H
#define __HOST1X_SYNCPT_H
#include <linux/atomic.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include "intr.h"
struct host1x;
/* Reserved for replacing an expired wait with a NOP */
#define HOST1X_SYNCPT_RESERVED 0
struct host1x_syncpt {
int id;
atomic_t min_val;
atomic_t max_val;
u32 base_val;
const char *name;
bool client_managed;
struct host1x *host;
struct device *dev;
/* interrupt data */
struct host1x_syncpt_intr intr;
};
/* Initialize sync point array */
int host1x_syncpt_init(struct host1x *host);
/* Free sync point array */
void host1x_syncpt_deinit(struct host1x *host);
/*
* Read max. It indicates how many operations there are in queue, either in
* channel or in a software thread.
* */
static inline u32 host1x_syncpt_read_max(struct host1x_syncpt *sp)
{
smp_rmb();
return (u32)atomic_read(&sp->max_val);
}
/*
* Read min, which is a shadow of the current sync point value in hardware.
*/
static inline u32 host1x_syncpt_read_min(struct host1x_syncpt *sp)
{
smp_rmb();
return (u32)atomic_read(&sp->min_val);
}
/* Return number of sync point supported. */
int host1x_syncpt_nb_pts(struct host1x *host);
/* Return number of wait bases supported. */
int host1x_syncpt_nb_bases(struct host1x *host);
/* Return number of mlocks supported. */
int host1x_syncpt_nb_mlocks(struct host1x *host);
/*
* Check sync point sanity. If max is larger than min, there have too many
* sync point increments.
*
* Client managed sync point are not tracked.
* */
static inline bool host1x_syncpt_check_max(struct host1x_syncpt *sp, u32 real)
{
u32 max;
if (sp->client_managed)
return true;
max = host1x_syncpt_read_max(sp);
return (s32)(max - real) >= 0;
}
/* Return true if sync point is client managed. */
static inline bool host1x_syncpt_client_managed(struct host1x_syncpt *sp)
{
return sp->client_managed;
}
/*
* Returns true if syncpoint min == max, which means that there are no
* outstanding operations.
*/
static inline bool host1x_syncpt_idle(struct host1x_syncpt *sp)
{
int min, max;
smp_rmb();
min = atomic_read(&sp->min_val);
max = atomic_read(&sp->max_val);
return (min == max);
}
/* Return pointer to struct denoting sync point id. */
struct host1x_syncpt *host1x_syncpt_get(struct host1x *host, u32 id);
/* Load current value from hardware to the shadow register. */
u32 host1x_syncpt_load(struct host1x_syncpt *sp);
/* Check if the given syncpoint value has already passed */
bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh);
/* Save host1x sync point state into shadow registers. */
void host1x_syncpt_save(struct host1x *host);
/* Reset host1x sync point state from shadow registers. */
void host1x_syncpt_restore(struct host1x *host);
/* Read current wait base value into shadow register and return it. */
u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp);
/* Request incrementing a sync point. */
int host1x_syncpt_incr(struct host1x_syncpt *sp);
/* Indicate future operations by incrementing the sync point max. */
u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs);
/* Wait until sync point reaches a threshold value, or a timeout. */
int host1x_syncpt_wait(struct host1x_syncpt *sp, u32 thresh,
long timeout, u32 *value);
/* Check if sync point id is valid. */
static inline int host1x_syncpt_is_valid(struct host1x_syncpt *sp)
{
return sp->id < host1x_syncpt_nb_pts(sp->host);
}
/* Patch a wait by replacing it with a wait for syncpt 0 value 0 */
int host1x_syncpt_patch_wait(struct host1x_syncpt *sp, void *patch_addr);
/* Return id of the sync point */
u32 host1x_syncpt_id(struct host1x_syncpt *sp);
/* Allocate a sync point for a device. */
struct host1x_syncpt *host1x_syncpt_request(struct device *dev,
bool client_managed);
/* Free a sync point. */
void host1x_syncpt_free(struct host1x_syncpt *sp);
#endif
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