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 29 struct host1x; 30 31 /* Reserved for replacing an expired wait with a NOP */ 32 #define HOST1X_SYNCPT_RESERVED 0 33 34 struct host1x_syncpt_base { 35 unsigned int id; 36 bool requested; 37 }; 38 39 struct host1x_syncpt { 40 unsigned 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 host1x_client *client; 48 struct host1x_syncpt_base *base; 49 50 /* interrupt data */ 51 struct host1x_syncpt_intr intr; 52 }; 53 54 /* Initialize sync point array */ 55 int host1x_syncpt_init(struct host1x *host); 56 57 /* Free sync point array */ 58 void host1x_syncpt_deinit(struct host1x *host); 59 60 /* Return number of sync point supported. */ 61 unsigned int host1x_syncpt_nb_pts(struct host1x *host); 62 63 /* Return number of wait bases supported. */ 64 unsigned int host1x_syncpt_nb_bases(struct host1x *host); 65 66 /* Return number of mlocks supported. */ 67 unsigned int 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 * */ 75 static 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. */ 85 static 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 */ 94 static 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. */ 104 u32 host1x_syncpt_load(struct host1x_syncpt *sp); 105 106 /* Check if the given syncpoint value has already passed */ 107 bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh); 108 109 /* Save host1x sync point state into shadow registers. */ 110 void host1x_syncpt_save(struct host1x *host); 111 112 /* Reset host1x sync point state from shadow registers. */ 113 void host1x_syncpt_restore(struct host1x *host); 114 115 /* Read current wait base value into shadow register and return it. */ 116 u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp); 117 118 /* Indicate future operations by incrementing the sync point max. */ 119 u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs); 120 121 /* Check if sync point id is valid. */ 122 static inline int host1x_syncpt_is_valid(struct host1x_syncpt *sp) 123 { 124 return sp->id < host1x_syncpt_nb_pts(sp->host); 125 } 126 127 #endif 128