1 // SPDX-License-Identifier: ISC 2 /* 3 * Copyright (c) 2014 Broadcom Corporation 4 */ 5 6 #include <linux/types.h> 7 #include <linux/netdevice.h> 8 9 #include <brcmu_utils.h> 10 #include <brcmu_wifi.h> 11 12 #include "core.h" 13 #include "commonring.h" 14 15 void brcmf_commonring_register_cb(struct brcmf_commonring *commonring, 16 int (*cr_ring_bell)(void *ctx), 17 int (*cr_update_rptr)(void *ctx), 18 int (*cr_update_wptr)(void *ctx), 19 int (*cr_write_rptr)(void *ctx), 20 int (*cr_write_wptr)(void *ctx), void *ctx) 21 { 22 commonring->cr_ring_bell = cr_ring_bell; 23 commonring->cr_update_rptr = cr_update_rptr; 24 commonring->cr_update_wptr = cr_update_wptr; 25 commonring->cr_write_rptr = cr_write_rptr; 26 commonring->cr_write_wptr = cr_write_wptr; 27 commonring->cr_ctx = ctx; 28 } 29 30 31 void brcmf_commonring_config(struct brcmf_commonring *commonring, u16 depth, 32 u16 item_len, void *buf_addr) 33 { 34 commonring->depth = depth; 35 commonring->item_len = item_len; 36 commonring->buf_addr = buf_addr; 37 if (!commonring->inited) { 38 spin_lock_init(&commonring->lock); 39 commonring->inited = true; 40 } 41 commonring->r_ptr = 0; 42 if (commonring->cr_write_rptr) 43 commonring->cr_write_rptr(commonring->cr_ctx); 44 commonring->w_ptr = 0; 45 if (commonring->cr_write_wptr) 46 commonring->cr_write_wptr(commonring->cr_ctx); 47 commonring->f_ptr = 0; 48 } 49 50 51 void brcmf_commonring_lock(struct brcmf_commonring *commonring) 52 __acquires(&commonring->lock) 53 { 54 unsigned long flags; 55 56 spin_lock_irqsave(&commonring->lock, flags); 57 commonring->flags = flags; 58 } 59 60 61 void brcmf_commonring_unlock(struct brcmf_commonring *commonring) 62 __releases(&commonring->lock) 63 { 64 spin_unlock_irqrestore(&commonring->lock, commonring->flags); 65 } 66 67 68 bool brcmf_commonring_write_available(struct brcmf_commonring *commonring) 69 { 70 u16 available; 71 bool retry = true; 72 73 again: 74 if (commonring->r_ptr <= commonring->w_ptr) 75 available = commonring->depth - commonring->w_ptr + 76 commonring->r_ptr; 77 else 78 available = commonring->r_ptr - commonring->w_ptr; 79 80 if (available > 1) { 81 if (!commonring->was_full) 82 return true; 83 if (available > commonring->depth / 8) { 84 commonring->was_full = false; 85 return true; 86 } 87 if (retry) { 88 if (commonring->cr_update_rptr) 89 commonring->cr_update_rptr(commonring->cr_ctx); 90 retry = false; 91 goto again; 92 } 93 return false; 94 } 95 96 if (retry) { 97 if (commonring->cr_update_rptr) 98 commonring->cr_update_rptr(commonring->cr_ctx); 99 retry = false; 100 goto again; 101 } 102 103 commonring->was_full = true; 104 return false; 105 } 106 107 108 void *brcmf_commonring_reserve_for_write(struct brcmf_commonring *commonring) 109 { 110 void *ret_ptr; 111 u16 available; 112 bool retry = true; 113 114 again: 115 if (commonring->r_ptr <= commonring->w_ptr) 116 available = commonring->depth - commonring->w_ptr + 117 commonring->r_ptr; 118 else 119 available = commonring->r_ptr - commonring->w_ptr; 120 121 if (available > 1) { 122 ret_ptr = commonring->buf_addr + 123 (commonring->w_ptr * commonring->item_len); 124 commonring->w_ptr++; 125 if (commonring->w_ptr == commonring->depth) 126 commonring->w_ptr = 0; 127 return ret_ptr; 128 } 129 130 if (retry) { 131 if (commonring->cr_update_rptr) 132 commonring->cr_update_rptr(commonring->cr_ctx); 133 retry = false; 134 goto again; 135 } 136 137 commonring->was_full = true; 138 return NULL; 139 } 140 141 142 void * 143 brcmf_commonring_reserve_for_write_multiple(struct brcmf_commonring *commonring, 144 u16 n_items, u16 *alloced) 145 { 146 void *ret_ptr; 147 u16 available; 148 bool retry = true; 149 150 again: 151 if (commonring->r_ptr <= commonring->w_ptr) 152 available = commonring->depth - commonring->w_ptr + 153 commonring->r_ptr; 154 else 155 available = commonring->r_ptr - commonring->w_ptr; 156 157 if (available > 1) { 158 ret_ptr = commonring->buf_addr + 159 (commonring->w_ptr * commonring->item_len); 160 *alloced = min_t(u16, n_items, available - 1); 161 if (*alloced + commonring->w_ptr > commonring->depth) 162 *alloced = commonring->depth - commonring->w_ptr; 163 commonring->w_ptr += *alloced; 164 if (commonring->w_ptr == commonring->depth) 165 commonring->w_ptr = 0; 166 return ret_ptr; 167 } 168 169 if (retry) { 170 if (commonring->cr_update_rptr) 171 commonring->cr_update_rptr(commonring->cr_ctx); 172 retry = false; 173 goto again; 174 } 175 176 commonring->was_full = true; 177 return NULL; 178 } 179 180 181 int brcmf_commonring_write_complete(struct brcmf_commonring *commonring) 182 { 183 if (commonring->f_ptr > commonring->w_ptr) 184 commonring->f_ptr = 0; 185 186 commonring->f_ptr = commonring->w_ptr; 187 188 if (commonring->cr_write_wptr) 189 commonring->cr_write_wptr(commonring->cr_ctx); 190 if (commonring->cr_ring_bell) 191 return commonring->cr_ring_bell(commonring->cr_ctx); 192 193 return -EIO; 194 } 195 196 197 void brcmf_commonring_write_cancel(struct brcmf_commonring *commonring, 198 u16 n_items) 199 { 200 if (commonring->w_ptr == 0) 201 commonring->w_ptr = commonring->depth - n_items; 202 else 203 commonring->w_ptr -= n_items; 204 } 205 206 207 void *brcmf_commonring_get_read_ptr(struct brcmf_commonring *commonring, 208 u16 *n_items) 209 { 210 if (commonring->cr_update_wptr) 211 commonring->cr_update_wptr(commonring->cr_ctx); 212 213 *n_items = (commonring->w_ptr >= commonring->r_ptr) ? 214 (commonring->w_ptr - commonring->r_ptr) : 215 (commonring->depth - commonring->r_ptr); 216 217 if (*n_items == 0) 218 return NULL; 219 220 return commonring->buf_addr + 221 (commonring->r_ptr * commonring->item_len); 222 } 223 224 225 int brcmf_commonring_read_complete(struct brcmf_commonring *commonring, 226 u16 n_items) 227 { 228 commonring->r_ptr += n_items; 229 if (commonring->r_ptr == commonring->depth) 230 commonring->r_ptr = 0; 231 232 if (commonring->cr_write_rptr) 233 return commonring->cr_write_rptr(commonring->cr_ctx); 234 235 return -EIO; 236 } 237