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#ifndef __HOST1X_SYNCPT_H 20#define __HOST1X_SYNCPT_H 21 22#include <linux/atomic.h> 23#include <linux/host1x.h> 24#include <linux/kernel.h> 25#include <linux/sched.h> 26 27#include "intr.h" 28 29struct host1x; 30 31/* Reserved for replacing an expired wait with a NOP */ 32#define HOST1X_SYNCPT_RESERVED 0 33 34struct host1x_syncpt_base { 35 unsigned int id; 36 bool requested; 37}; 38 39struct host1x_syncpt { 40 int id; 41 atomic_t min_val; 42 atomic_t max_val; 43 u32 base_val; 44 const char *name; 45 bool client_managed; 46 struct host1x *host; 47 struct device *dev; 48 struct host1x_syncpt_base *base; 49 50 /* interrupt data */ 51 struct host1x_syncpt_intr intr; 52}; 53 54/* Initialize sync point array */ 55int host1x_syncpt_init(struct host1x *host); 56 57/* Free sync point array */ 58void host1x_syncpt_deinit(struct host1x *host); 59 60/* Return number of sync point supported. */ 61int host1x_syncpt_nb_pts(struct host1x *host); 62 63/* Return number of wait bases supported. */ 64int host1x_syncpt_nb_bases(struct host1x *host); 65 66/* Return number of mlocks supported. */ 67int host1x_syncpt_nb_mlocks(struct host1x *host); 68 69/* 70 * Check sync point sanity. If max is larger than min, there have too many 71 * sync point increments. 72 * 73 * Client managed sync point are not tracked. 74 * */ 75static inline bool host1x_syncpt_check_max(struct host1x_syncpt *sp, u32 real) 76{ 77 u32 max; 78 if (sp->client_managed) 79 return true; 80 max = host1x_syncpt_read_max(sp); 81 return (s32)(max - real) >= 0; 82} 83 84/* Return true if sync point is client managed. */ 85static inline bool host1x_syncpt_client_managed(struct host1x_syncpt *sp) 86{ 87 return sp->client_managed; 88} 89 90/* 91 * Returns true if syncpoint min == max, which means that there are no 92 * outstanding operations. 93 */ 94static inline bool host1x_syncpt_idle(struct host1x_syncpt *sp) 95{ 96 int min, max; 97 smp_rmb(); 98 min = atomic_read(&sp->min_val); 99 max = atomic_read(&sp->max_val); 100 return (min == max); 101} 102 103/* Load current value from hardware to the shadow register. */ 104u32 host1x_syncpt_load(struct host1x_syncpt *sp); 105 106/* Check if the given syncpoint value has already passed */ 107bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh); 108 109/* Save host1x sync point state into shadow registers. */ 110void host1x_syncpt_save(struct host1x *host); 111 112/* Reset host1x sync point state from shadow registers. */ 113void host1x_syncpt_restore(struct host1x *host); 114 115/* Read current wait base value into shadow register and return it. */ 116u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp); 117 118/* Indicate future operations by incrementing the sync point max. */ 119u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs); 120 121/* Check if sync point id is valid. */ 122static inline int host1x_syncpt_is_valid(struct host1x_syncpt *sp) 123{ 124 return sp->id < host1x_syncpt_nb_pts(sp->host); 125} 126 127/* Patch a wait by replacing it with a wait for syncpt 0 value 0 */ 128int host1x_syncpt_patch_wait(struct host1x_syncpt *sp, void *patch_addr); 129 130#endif 131