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 * If a submission incrementing this syncpoint fails, lock it so that 46 * further submission cannot be made until application has handled the 47 * failure. 48 */ 49 bool locked; 50 }; 51 52 /* Initialize sync point array */ 53 int host1x_syncpt_init(struct host1x *host); 54 55 /* Free sync point array */ 56 void host1x_syncpt_deinit(struct host1x *host); 57 58 /* Return number of sync point supported. */ 59 unsigned int host1x_syncpt_nb_pts(struct host1x *host); 60 61 /* Return number of wait bases supported. */ 62 unsigned int host1x_syncpt_nb_bases(struct host1x *host); 63 64 /* Return number of mlocks supported. */ 65 unsigned int host1x_syncpt_nb_mlocks(struct host1x *host); 66 67 /* 68 * Check sync point sanity. If max is larger than min, there have too many 69 * sync point increments. 70 * 71 * Client managed sync point are not tracked. 72 * */ 73 static inline bool host1x_syncpt_check_max(struct host1x_syncpt *sp, u32 real) 74 { 75 u32 max; 76 if (sp->client_managed) 77 return true; 78 max = host1x_syncpt_read_max(sp); 79 return (s32)(max - real) >= 0; 80 } 81 82 /* Return true if sync point is client managed. */ 83 static inline bool host1x_syncpt_client_managed(struct host1x_syncpt *sp) 84 { 85 return sp->client_managed; 86 } 87 88 /* 89 * Returns true if syncpoint min == max, which means that there are no 90 * outstanding operations. 91 */ 92 static inline bool host1x_syncpt_idle(struct host1x_syncpt *sp) 93 { 94 int min, max; 95 smp_rmb(); 96 min = atomic_read(&sp->min_val); 97 max = atomic_read(&sp->max_val); 98 return (min == max); 99 } 100 101 /* Load current value from hardware to the shadow register. */ 102 u32 host1x_syncpt_load(struct host1x_syncpt *sp); 103 104 /* Check if the given syncpoint value has already passed */ 105 bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh); 106 107 /* Save host1x sync point state into shadow registers. */ 108 void host1x_syncpt_save(struct host1x *host); 109 110 /* Reset host1x sync point state from shadow registers. */ 111 void host1x_syncpt_restore(struct host1x *host); 112 113 /* Read current wait base value into shadow register and return it. */ 114 u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp); 115 116 /* Indicate future operations by incrementing the sync point max. */ 117 u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs); 118 119 /* Check if sync point id is valid. */ 120 static inline int host1x_syncpt_is_valid(struct host1x_syncpt *sp) 121 { 122 return sp->id < host1x_syncpt_nb_pts(sp->host); 123 } 124 125 static inline void host1x_syncpt_set_locked(struct host1x_syncpt *sp) 126 { 127 sp->locked = true; 128 } 129 130 #endif 131