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/sched.h> 15 16 #include "intr.h" 17 18 struct host1x; 19 20 /* Reserved for replacing an expired wait with a NOP */ 21 #define HOST1X_SYNCPT_RESERVED 0 22 23 struct host1x_syncpt_base { 24 unsigned int id; 25 bool requested; 26 }; 27 28 struct host1x_syncpt { 29 unsigned int id; 30 atomic_t min_val; 31 atomic_t max_val; 32 u32 base_val; 33 const char *name; 34 bool client_managed; 35 struct host1x *host; 36 struct host1x_client *client; 37 struct host1x_syncpt_base *base; 38 39 /* interrupt data */ 40 struct host1x_syncpt_intr intr; 41 }; 42 43 /* Initialize sync point array */ 44 int host1x_syncpt_init(struct host1x *host); 45 46 /* Free sync point array */ 47 void host1x_syncpt_deinit(struct host1x *host); 48 49 /* Return number of sync point supported. */ 50 unsigned int host1x_syncpt_nb_pts(struct host1x *host); 51 52 /* Return number of wait bases supported. */ 53 unsigned int host1x_syncpt_nb_bases(struct host1x *host); 54 55 /* Return number of mlocks supported. */ 56 unsigned int host1x_syncpt_nb_mlocks(struct host1x *host); 57 58 /* 59 * Check sync point sanity. If max is larger than min, there have too many 60 * sync point increments. 61 * 62 * Client managed sync point are not tracked. 63 * */ 64 static inline bool host1x_syncpt_check_max(struct host1x_syncpt *sp, u32 real) 65 { 66 u32 max; 67 if (sp->client_managed) 68 return true; 69 max = host1x_syncpt_read_max(sp); 70 return (s32)(max - real) >= 0; 71 } 72 73 /* Return true if sync point is client managed. */ 74 static inline bool host1x_syncpt_client_managed(struct host1x_syncpt *sp) 75 { 76 return sp->client_managed; 77 } 78 79 /* 80 * Returns true if syncpoint min == max, which means that there are no 81 * outstanding operations. 82 */ 83 static inline bool host1x_syncpt_idle(struct host1x_syncpt *sp) 84 { 85 int min, max; 86 smp_rmb(); 87 min = atomic_read(&sp->min_val); 88 max = atomic_read(&sp->max_val); 89 return (min == max); 90 } 91 92 /* Load current value from hardware to the shadow register. */ 93 u32 host1x_syncpt_load(struct host1x_syncpt *sp); 94 95 /* Check if the given syncpoint value has already passed */ 96 bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh); 97 98 /* Save host1x sync point state into shadow registers. */ 99 void host1x_syncpt_save(struct host1x *host); 100 101 /* Reset host1x sync point state from shadow registers. */ 102 void host1x_syncpt_restore(struct host1x *host); 103 104 /* Read current wait base value into shadow register and return it. */ 105 u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp); 106 107 /* Indicate future operations by incrementing the sync point max. */ 108 u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs); 109 110 /* Check if sync point id is valid. */ 111 static inline int host1x_syncpt_is_valid(struct host1x_syncpt *sp) 112 { 113 return sp->id < host1x_syncpt_nb_pts(sp->host); 114 } 115 116 #endif 117