1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Tegra host1x Syncpoints 4 * 5 * Copyright (c) 2010-2013, NVIDIA Corporation. 6 */ 7 8 #ifndef __HOST1X_SYNCPT_H 9 #define __HOST1X_SYNCPT_H 10 11 #include <linux/atomic.h> 12 #include <linux/host1x.h> 13 #include <linux/kernel.h> 14 #include <linux/kref.h> 15 #include <linux/sched.h> 16 17 #include "intr.h" 18 19 struct host1x; 20 21 /* Reserved for replacing an expired wait with a NOP */ 22 #define HOST1X_SYNCPT_RESERVED 0 23 24 struct host1x_syncpt_base { 25 unsigned int id; 26 bool requested; 27 }; 28 29 struct host1x_syncpt { 30 struct kref ref; 31 32 unsigned int id; 33 atomic_t min_val; 34 atomic_t max_val; 35 u32 base_val; 36 const char *name; 37 bool client_managed; 38 struct host1x *host; 39 struct host1x_syncpt_base *base; 40 41 /* interrupt data */ 42 struct host1x_syncpt_intr intr; 43 }; 44 45 /* Initialize sync point array */ 46 int host1x_syncpt_init(struct host1x *host); 47 48 /* Free sync point array */ 49 void host1x_syncpt_deinit(struct host1x *host); 50 51 /* Return number of sync point supported. */ 52 unsigned int host1x_syncpt_nb_pts(struct host1x *host); 53 54 /* Return number of wait bases supported. */ 55 unsigned int host1x_syncpt_nb_bases(struct host1x *host); 56 57 /* Return number of mlocks supported. */ 58 unsigned int host1x_syncpt_nb_mlocks(struct host1x *host); 59 60 /* 61 * Check sync point sanity. If max is larger than min, there have too many 62 * sync point increments. 63 * 64 * Client managed sync point are not tracked. 65 * */ 66 static inline bool host1x_syncpt_check_max(struct host1x_syncpt *sp, u32 real) 67 { 68 u32 max; 69 if (sp->client_managed) 70 return true; 71 max = host1x_syncpt_read_max(sp); 72 return (s32)(max - real) >= 0; 73 } 74 75 /* Return true if sync point is client managed. */ 76 static inline bool host1x_syncpt_client_managed(struct host1x_syncpt *sp) 77 { 78 return sp->client_managed; 79 } 80 81 /* 82 * Returns true if syncpoint min == max, which means that there are no 83 * outstanding operations. 84 */ 85 static inline bool host1x_syncpt_idle(struct host1x_syncpt *sp) 86 { 87 int min, max; 88 smp_rmb(); 89 min = atomic_read(&sp->min_val); 90 max = atomic_read(&sp->max_val); 91 return (min == max); 92 } 93 94 /* Load current value from hardware to the shadow register. */ 95 u32 host1x_syncpt_load(struct host1x_syncpt *sp); 96 97 /* Check if the given syncpoint value has already passed */ 98 bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh); 99 100 /* Save host1x sync point state into shadow registers. */ 101 void host1x_syncpt_save(struct host1x *host); 102 103 /* Reset host1x sync point state from shadow registers. */ 104 void host1x_syncpt_restore(struct host1x *host); 105 106 /* Read current wait base value into shadow register and return it. */ 107 u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp); 108 109 /* Indicate future operations by incrementing the sync point max. */ 110 u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs); 111 112 /* Check if sync point id is valid. */ 113 static inline int host1x_syncpt_is_valid(struct host1x_syncpt *sp) 114 { 115 return sp->id < host1x_syncpt_nb_pts(sp->host); 116 } 117 118 #endif 119