163 lines
4.5 KiB
C
163 lines
4.5 KiB
C
/*
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* Tegra host1x Syncpoints
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*
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* Copyright (c) 2010-2013, NVIDIA Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __HOST1X_SYNCPT_H
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#define __HOST1X_SYNCPT_H
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#include <linux/atomic.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include "intr.h"
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struct host1x;
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/* Reserved for replacing an expired wait with a NOP */
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#define HOST1X_SYNCPT_RESERVED 0
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struct host1x_syncpt {
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int id;
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atomic_t min_val;
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atomic_t max_val;
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u32 base_val;
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const char *name;
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bool client_managed;
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struct host1x *host;
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struct device *dev;
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/* interrupt data */
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struct host1x_syncpt_intr intr;
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};
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/* Initialize sync point array */
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int host1x_syncpt_init(struct host1x *host);
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/* Free sync point array */
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void host1x_syncpt_deinit(struct host1x *host);
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/*
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* Read max. It indicates how many operations there are in queue, either in
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* channel or in a software thread.
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* */
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static inline u32 host1x_syncpt_read_max(struct host1x_syncpt *sp)
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{
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smp_rmb();
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return (u32)atomic_read(&sp->max_val);
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}
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/*
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* Read min, which is a shadow of the current sync point value in hardware.
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*/
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static inline u32 host1x_syncpt_read_min(struct host1x_syncpt *sp)
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{
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smp_rmb();
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return (u32)atomic_read(&sp->min_val);
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}
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/* Return number of sync point supported. */
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int host1x_syncpt_nb_pts(struct host1x *host);
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/* Return number of wait bases supported. */
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int host1x_syncpt_nb_bases(struct host1x *host);
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/* Return number of mlocks supported. */
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int host1x_syncpt_nb_mlocks(struct host1x *host);
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/*
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* Check sync point sanity. If max is larger than min, there have too many
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* sync point increments.
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*
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* Client managed sync point are not tracked.
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* */
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static inline bool host1x_syncpt_check_max(struct host1x_syncpt *sp, u32 real)
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{
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u32 max;
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if (sp->client_managed)
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return true;
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max = host1x_syncpt_read_max(sp);
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return (s32)(max - real) >= 0;
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}
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/* Return true if sync point is client managed. */
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static inline bool host1x_syncpt_client_managed(struct host1x_syncpt *sp)
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{
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return sp->client_managed;
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}
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/*
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* Returns true if syncpoint min == max, which means that there are no
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* outstanding operations.
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*/
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static inline bool host1x_syncpt_idle(struct host1x_syncpt *sp)
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{
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int min, max;
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smp_rmb();
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min = atomic_read(&sp->min_val);
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max = atomic_read(&sp->max_val);
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return (min == max);
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}
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/* Return pointer to struct denoting sync point id. */
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struct host1x_syncpt *host1x_syncpt_get(struct host1x *host, u32 id);
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/* Load current value from hardware to the shadow register. */
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u32 host1x_syncpt_load(struct host1x_syncpt *sp);
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/* Check if the given syncpoint value has already passed */
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bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh);
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/* Save host1x sync point state into shadow registers. */
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void host1x_syncpt_save(struct host1x *host);
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/* Reset host1x sync point state from shadow registers. */
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void host1x_syncpt_restore(struct host1x *host);
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/* Read current wait base value into shadow register and return it. */
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u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp);
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/* Request incrementing a sync point. */
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int host1x_syncpt_incr(struct host1x_syncpt *sp);
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/* Indicate future operations by incrementing the sync point max. */
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u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs);
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/* Wait until sync point reaches a threshold value, or a timeout. */
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int host1x_syncpt_wait(struct host1x_syncpt *sp, u32 thresh,
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long timeout, u32 *value);
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/* Check if sync point id is valid. */
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static inline int host1x_syncpt_is_valid(struct host1x_syncpt *sp)
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{
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return sp->id < host1x_syncpt_nb_pts(sp->host);
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}
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/* Patch a wait by replacing it with a wait for syncpt 0 value 0 */
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int host1x_syncpt_patch_wait(struct host1x_syncpt *sp, void *patch_addr);
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/* Return id of the sync point */
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u32 host1x_syncpt_id(struct host1x_syncpt *sp);
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/* Allocate a sync point for a device. */
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struct host1x_syncpt *host1x_syncpt_request(struct device *dev,
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bool client_managed);
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/* Free a sync point. */
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void host1x_syncpt_free(struct host1x_syncpt *sp);
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#endif
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