1 /* 2 * Copyright (c) 2014 Redpine Signals Inc. 3 * 4 * Permission to use, copy, modify, and/or distribute this software for any 5 * purpose with or without fee is hereby granted, provided that the above 6 * copyright notice and this permission notice appear in all copies. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 15 * 16 */ 17 18 #include <linux/firmware.h> 19 #include <net/rsi_91x.h> 20 #include "rsi_sdio.h" 21 #include "rsi_common.h" 22 23 /** 24 * rsi_sdio_master_access_msword() - This function sets the AHB master access 25 * MS word in the SDIO slave registers. 26 * @adapter: Pointer to the adapter structure. 27 * @ms_word: ms word need to be initialized. 28 * 29 * Return: status: 0 on success, -1 on failure. 30 */ 31 int rsi_sdio_master_access_msword(struct rsi_hw *adapter, u16 ms_word) 32 { 33 u8 byte; 34 u8 function = 0; 35 int status = 0; 36 37 byte = (u8)(ms_word & 0x00FF); 38 39 rsi_dbg(INIT_ZONE, 40 "%s: MASTER_ACCESS_MSBYTE:0x%x\n", __func__, byte); 41 42 status = rsi_sdio_write_register(adapter, 43 function, 44 SDIO_MASTER_ACCESS_MSBYTE, 45 &byte); 46 if (status) { 47 rsi_dbg(ERR_ZONE, 48 "%s: fail to access MASTER_ACCESS_MSBYTE\n", 49 __func__); 50 return -1; 51 } 52 53 byte = (u8)(ms_word >> 8); 54 55 rsi_dbg(INIT_ZONE, "%s:MASTER_ACCESS_LSBYTE:0x%x\n", __func__, byte); 56 status = rsi_sdio_write_register(adapter, 57 function, 58 SDIO_MASTER_ACCESS_LSBYTE, 59 &byte); 60 return status; 61 } 62 63 static void rsi_rx_handler(struct rsi_hw *adapter); 64 65 void rsi_sdio_rx_thread(struct rsi_common *common) 66 { 67 struct rsi_hw *adapter = common->priv; 68 struct rsi_91x_sdiodev *sdev = adapter->rsi_dev; 69 70 do { 71 rsi_wait_event(&sdev->rx_thread.event, EVENT_WAIT_FOREVER); 72 rsi_reset_event(&sdev->rx_thread.event); 73 rsi_rx_handler(adapter); 74 } while (!atomic_read(&sdev->rx_thread.thread_done)); 75 76 rsi_dbg(INFO_ZONE, "%s: Terminated SDIO RX thread\n", __func__); 77 atomic_inc(&sdev->rx_thread.thread_done); 78 kthread_complete_and_exit(&sdev->rx_thread.completion, 0); 79 } 80 81 /** 82 * rsi_process_pkt() - This Function reads rx_blocks register and figures out 83 * the size of the rx pkt. 84 * @common: Pointer to the driver private structure. 85 * 86 * Return: 0 on success, -1 on failure. 87 */ 88 static int rsi_process_pkt(struct rsi_common *common) 89 { 90 struct rsi_hw *adapter = common->priv; 91 struct rsi_91x_sdiodev *dev = 92 (struct rsi_91x_sdiodev *)adapter->rsi_dev; 93 u8 num_blks = 0; 94 u32 rcv_pkt_len = 0; 95 int status = 0; 96 u8 value = 0; 97 98 num_blks = ((adapter->interrupt_status & 1) | 99 ((adapter->interrupt_status >> RECV_NUM_BLOCKS) << 1)); 100 101 if (!num_blks) { 102 status = rsi_sdio_read_register(adapter, 103 SDIO_RX_NUM_BLOCKS_REG, 104 &value); 105 if (status) { 106 rsi_dbg(ERR_ZONE, 107 "%s: Failed to read pkt length from the card:\n", 108 __func__); 109 return status; 110 } 111 num_blks = value & 0x1f; 112 } 113 114 if (dev->write_fail == 2) 115 rsi_sdio_ack_intr(common->priv, (1 << MSDU_PKT_PENDING)); 116 117 if (unlikely(!num_blks)) { 118 dev->write_fail = 2; 119 return -1; 120 } 121 122 rcv_pkt_len = (num_blks * 256); 123 124 status = rsi_sdio_host_intf_read_pkt(adapter, dev->pktbuffer, 125 rcv_pkt_len); 126 if (status) { 127 rsi_dbg(ERR_ZONE, "%s: Failed to read packet from card\n", 128 __func__); 129 return status; 130 } 131 132 status = rsi_read_pkt(common, dev->pktbuffer, rcv_pkt_len); 133 if (status) { 134 rsi_dbg(ERR_ZONE, "Failed to read the packet\n"); 135 return status; 136 } 137 138 return 0; 139 } 140 141 /** 142 * rsi_init_sdio_slave_regs() - This function does the actual initialization 143 * of SDBUS slave registers. 144 * @adapter: Pointer to the adapter structure. 145 * 146 * Return: status: 0 on success, -1 on failure. 147 */ 148 int rsi_init_sdio_slave_regs(struct rsi_hw *adapter) 149 { 150 struct rsi_91x_sdiodev *dev = 151 (struct rsi_91x_sdiodev *)adapter->rsi_dev; 152 u8 function = 0; 153 u8 byte; 154 int status = 0; 155 156 if (dev->next_read_delay) { 157 byte = dev->next_read_delay; 158 status = rsi_sdio_write_register(adapter, 159 function, 160 SDIO_NXT_RD_DELAY2, 161 &byte); 162 if (status) { 163 rsi_dbg(ERR_ZONE, 164 "%s: Failed to write SDIO_NXT_RD_DELAY2\n", 165 __func__); 166 return -1; 167 } 168 } 169 170 if (dev->sdio_high_speed_enable) { 171 rsi_dbg(INIT_ZONE, "%s: Enabling SDIO High speed\n", __func__); 172 byte = 0x3; 173 174 status = rsi_sdio_write_register(adapter, 175 function, 176 SDIO_REG_HIGH_SPEED, 177 &byte); 178 if (status) { 179 rsi_dbg(ERR_ZONE, 180 "%s: Failed to enable SDIO high speed\n", 181 __func__); 182 return -1; 183 } 184 } 185 186 /* This tells SDIO FIFO when to start read to host */ 187 rsi_dbg(INIT_ZONE, "%s: Initializing SDIO read start level\n", __func__); 188 byte = 0x24; 189 190 status = rsi_sdio_write_register(adapter, 191 function, 192 SDIO_READ_START_LVL, 193 &byte); 194 if (status) { 195 rsi_dbg(ERR_ZONE, 196 "%s: Failed to write SDIO_READ_START_LVL\n", __func__); 197 return -1; 198 } 199 200 rsi_dbg(INIT_ZONE, "%s: Initializing FIFO ctrl registers\n", __func__); 201 byte = (128 - 32); 202 203 status = rsi_sdio_write_register(adapter, 204 function, 205 SDIO_READ_FIFO_CTL, 206 &byte); 207 if (status) { 208 rsi_dbg(ERR_ZONE, 209 "%s: Failed to write SDIO_READ_FIFO_CTL\n", __func__); 210 return -1; 211 } 212 213 byte = 32; 214 status = rsi_sdio_write_register(adapter, 215 function, 216 SDIO_WRITE_FIFO_CTL, 217 &byte); 218 if (status) { 219 rsi_dbg(ERR_ZONE, 220 "%s: Failed to write SDIO_WRITE_FIFO_CTL\n", __func__); 221 return -1; 222 } 223 224 return 0; 225 } 226 227 /** 228 * rsi_rx_handler() - Read and process SDIO interrupts. 229 * @adapter: Pointer to the adapter structure. 230 * 231 * Return: None. 232 */ 233 static void rsi_rx_handler(struct rsi_hw *adapter) 234 { 235 struct rsi_common *common = adapter->priv; 236 struct rsi_91x_sdiodev *dev = 237 (struct rsi_91x_sdiodev *)adapter->rsi_dev; 238 int status; 239 u8 isr_status = 0; 240 u8 fw_status = 0; 241 242 dev->rx_info.sdio_int_counter++; 243 244 do { 245 mutex_lock(&common->rx_lock); 246 status = rsi_sdio_read_register(common->priv, 247 RSI_FN1_INT_REGISTER, 248 &isr_status); 249 if (status) { 250 rsi_dbg(ERR_ZONE, 251 "%s: Failed to Read Intr Status Register\n", 252 __func__); 253 mutex_unlock(&common->rx_lock); 254 return; 255 } 256 adapter->interrupt_status = isr_status; 257 258 if (isr_status == 0) { 259 rsi_set_event(&common->tx_thread.event); 260 dev->rx_info.sdio_intr_status_zero++; 261 mutex_unlock(&common->rx_lock); 262 return; 263 } 264 265 rsi_dbg(ISR_ZONE, "%s: Intr_status = %x %d %d\n", 266 __func__, isr_status, (1 << MSDU_PKT_PENDING), 267 (1 << FW_ASSERT_IND)); 268 269 if (isr_status & BIT(PKT_BUFF_AVAILABLE)) { 270 status = rsi_sdio_check_buffer_status(adapter, 0); 271 if (status < 0) 272 rsi_dbg(ERR_ZONE, 273 "%s: Failed to check buffer status\n", 274 __func__); 275 rsi_sdio_ack_intr(common->priv, 276 BIT(PKT_BUFF_AVAILABLE)); 277 rsi_set_event(&common->tx_thread.event); 278 279 rsi_dbg(ISR_ZONE, "%s: ==> BUFFER_AVAILABLE <==\n", 280 __func__); 281 dev->buff_status_updated = true; 282 283 isr_status &= ~BIT(PKT_BUFF_AVAILABLE); 284 } 285 286 if (isr_status & BIT(FW_ASSERT_IND)) { 287 rsi_dbg(ERR_ZONE, "%s: ==> FIRMWARE Assert <==\n", 288 __func__); 289 status = rsi_sdio_read_register(common->priv, 290 SDIO_FW_STATUS_REG, 291 &fw_status); 292 if (status) { 293 rsi_dbg(ERR_ZONE, 294 "%s: Failed to read f/w reg\n", 295 __func__); 296 } else { 297 rsi_dbg(ERR_ZONE, 298 "%s: Firmware Status is 0x%x\n", 299 __func__, fw_status); 300 rsi_sdio_ack_intr(common->priv, 301 BIT(FW_ASSERT_IND)); 302 } 303 304 common->fsm_state = FSM_CARD_NOT_READY; 305 306 isr_status &= ~BIT(FW_ASSERT_IND); 307 } 308 309 if (isr_status & BIT(MSDU_PKT_PENDING)) { 310 rsi_dbg(ISR_ZONE, "Pkt pending interrupt\n"); 311 dev->rx_info.total_sdio_msdu_pending_intr++; 312 313 status = rsi_process_pkt(common); 314 if (status) { 315 rsi_dbg(ERR_ZONE, "%s: Failed to read pkt\n", 316 __func__); 317 mutex_unlock(&common->rx_lock); 318 return; 319 } 320 321 isr_status &= ~BIT(MSDU_PKT_PENDING); 322 } 323 324 if (isr_status) { 325 rsi_sdio_ack_intr(common->priv, isr_status); 326 dev->rx_info.total_sdio_unknown_intr++; 327 isr_status = 0; 328 rsi_dbg(ISR_ZONE, "Unknown Interrupt %x\n", 329 isr_status); 330 } 331 332 mutex_unlock(&common->rx_lock); 333 } while (1); 334 } 335 336 /* This function is used to read buffer status register and 337 * set relevant fields in rsi_91x_sdiodev struct. 338 */ 339 int rsi_sdio_check_buffer_status(struct rsi_hw *adapter, u8 q_num) 340 { 341 struct rsi_common *common = adapter->priv; 342 struct rsi_91x_sdiodev *dev = 343 (struct rsi_91x_sdiodev *)adapter->rsi_dev; 344 u8 buf_status = 0; 345 int status = 0; 346 static int counter = 4; 347 348 if (!dev->buff_status_updated && counter) { 349 counter--; 350 goto out; 351 } 352 353 dev->buff_status_updated = false; 354 status = rsi_sdio_read_register(common->priv, 355 RSI_DEVICE_BUFFER_STATUS_REGISTER, 356 &buf_status); 357 358 if (status) { 359 rsi_dbg(ERR_ZONE, 360 "%s: Failed to read status register\n", __func__); 361 return -1; 362 } 363 364 if (buf_status & (BIT(PKT_MGMT_BUFF_FULL))) { 365 if (!dev->rx_info.mgmt_buffer_full) 366 dev->rx_info.mgmt_buf_full_counter++; 367 dev->rx_info.mgmt_buffer_full = true; 368 } else { 369 dev->rx_info.mgmt_buffer_full = false; 370 } 371 372 if (buf_status & (BIT(PKT_BUFF_FULL))) { 373 if (!dev->rx_info.buffer_full) 374 dev->rx_info.buf_full_counter++; 375 dev->rx_info.buffer_full = true; 376 } else { 377 dev->rx_info.buffer_full = false; 378 } 379 380 if (buf_status & (BIT(PKT_BUFF_SEMI_FULL))) { 381 if (!dev->rx_info.semi_buffer_full) 382 dev->rx_info.buf_semi_full_counter++; 383 dev->rx_info.semi_buffer_full = true; 384 } else { 385 dev->rx_info.semi_buffer_full = false; 386 } 387 388 if (dev->rx_info.mgmt_buffer_full || dev->rx_info.buf_full_counter) 389 counter = 1; 390 else 391 counter = 4; 392 393 out: 394 if ((q_num == MGMT_SOFT_Q) && (dev->rx_info.mgmt_buffer_full)) 395 return QUEUE_FULL; 396 397 if ((q_num < MGMT_SOFT_Q) && (dev->rx_info.buffer_full)) 398 return QUEUE_FULL; 399 400 return QUEUE_NOT_FULL; 401 } 402 403 /** 404 * rsi_sdio_determine_event_timeout() - This Function determines the event 405 * timeout duration. 406 * @adapter: Pointer to the adapter structure. 407 * 408 * Return: timeout duration is returned. 409 */ 410 int rsi_sdio_determine_event_timeout(struct rsi_hw *adapter) 411 { 412 struct rsi_91x_sdiodev *dev = 413 (struct rsi_91x_sdiodev *)adapter->rsi_dev; 414 415 /* Once buffer full is seen, event timeout to occur every 2 msecs */ 416 if (dev->rx_info.buffer_full) 417 return 2; 418 419 return EVENT_WAIT_FOREVER; 420 } 421