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 */
rsi_sdio_master_access_msword(struct rsi_hw * adapter,u16 ms_word)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
rsi_sdio_rx_thread(struct rsi_common * common)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 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 */
rsi_process_pkt(struct rsi_common * common)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 */
rsi_init_sdio_slave_regs(struct rsi_hw * adapter)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 */
rsi_rx_handler(struct rsi_hw * adapter)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 enum sdio_interrupt_type isr_type;
240 u8 isr_status = 0;
241 u8 fw_status = 0;
242
243 dev->rx_info.sdio_int_counter++;
244
245 do {
246 mutex_lock(&common->rx_lock);
247 status = rsi_sdio_read_register(common->priv,
248 RSI_FN1_INT_REGISTER,
249 &isr_status);
250 if (status) {
251 rsi_dbg(ERR_ZONE,
252 "%s: Failed to Read Intr Status Register\n",
253 __func__);
254 mutex_unlock(&common->rx_lock);
255 return;
256 }
257 adapter->interrupt_status = isr_status;
258
259 if (isr_status == 0) {
260 rsi_set_event(&common->tx_thread.event);
261 dev->rx_info.sdio_intr_status_zero++;
262 mutex_unlock(&common->rx_lock);
263 return;
264 }
265
266 rsi_dbg(ISR_ZONE, "%s: Intr_status = %x %d %d\n",
267 __func__, isr_status, (1 << MSDU_PKT_PENDING),
268 (1 << FW_ASSERT_IND));
269
270 do {
271 RSI_GET_SDIO_INTERRUPT_TYPE(isr_status, isr_type);
272
273 switch (isr_type) {
274 case BUFFER_AVAILABLE:
275 status = rsi_sdio_check_buffer_status(adapter,
276 0);
277 if (status < 0)
278 rsi_dbg(ERR_ZONE,
279 "%s: Failed to check buffer status\n",
280 __func__);
281 rsi_sdio_ack_intr(common->priv,
282 (1 << PKT_BUFF_AVAILABLE));
283 rsi_set_event(&common->tx_thread.event);
284
285 rsi_dbg(ISR_ZONE,
286 "%s: ==> BUFFER_AVAILABLE <==\n",
287 __func__);
288 dev->buff_status_updated = true;
289 break;
290
291 case FIRMWARE_ASSERT_IND:
292 rsi_dbg(ERR_ZONE,
293 "%s: ==> FIRMWARE Assert <==\n",
294 __func__);
295 status = rsi_sdio_read_register(common->priv,
296 SDIO_FW_STATUS_REG,
297 &fw_status);
298 if (status) {
299 rsi_dbg(ERR_ZONE,
300 "%s: Failed to read f/w reg\n",
301 __func__);
302 } else {
303 rsi_dbg(ERR_ZONE,
304 "%s: Firmware Status is 0x%x\n",
305 __func__ , fw_status);
306 rsi_sdio_ack_intr(common->priv,
307 (1 << FW_ASSERT_IND));
308 }
309
310 common->fsm_state = FSM_CARD_NOT_READY;
311 break;
312
313 case MSDU_PACKET_PENDING:
314 rsi_dbg(ISR_ZONE, "Pkt pending interrupt\n");
315 dev->rx_info.total_sdio_msdu_pending_intr++;
316
317 status = rsi_process_pkt(common);
318 if (status) {
319 rsi_dbg(ERR_ZONE,
320 "%s: Failed to read pkt\n",
321 __func__);
322 mutex_unlock(&common->rx_lock);
323 return;
324 }
325 break;
326 default:
327 rsi_sdio_ack_intr(common->priv, isr_status);
328 dev->rx_info.total_sdio_unknown_intr++;
329 isr_status = 0;
330 rsi_dbg(ISR_ZONE,
331 "Unknown Interrupt %x\n",
332 isr_status);
333 break;
334 }
335 isr_status ^= BIT(isr_type - 1);
336 } while (isr_status);
337 mutex_unlock(&common->rx_lock);
338 } while (1);
339 }
340
341 /* This function is used to read buffer status register and
342 * set relevant fields in rsi_91x_sdiodev struct.
343 */
rsi_sdio_check_buffer_status(struct rsi_hw * adapter,u8 q_num)344 int rsi_sdio_check_buffer_status(struct rsi_hw *adapter, u8 q_num)
345 {
346 struct rsi_common *common = adapter->priv;
347 struct rsi_91x_sdiodev *dev =
348 (struct rsi_91x_sdiodev *)adapter->rsi_dev;
349 u8 buf_status = 0;
350 int status = 0;
351 static int counter = 4;
352
353 if (!dev->buff_status_updated && counter) {
354 counter--;
355 goto out;
356 }
357
358 dev->buff_status_updated = false;
359 status = rsi_sdio_read_register(common->priv,
360 RSI_DEVICE_BUFFER_STATUS_REGISTER,
361 &buf_status);
362
363 if (status) {
364 rsi_dbg(ERR_ZONE,
365 "%s: Failed to read status register\n", __func__);
366 return -1;
367 }
368
369 if (buf_status & (BIT(PKT_MGMT_BUFF_FULL))) {
370 if (!dev->rx_info.mgmt_buffer_full)
371 dev->rx_info.mgmt_buf_full_counter++;
372 dev->rx_info.mgmt_buffer_full = true;
373 } else {
374 dev->rx_info.mgmt_buffer_full = false;
375 }
376
377 if (buf_status & (BIT(PKT_BUFF_FULL))) {
378 if (!dev->rx_info.buffer_full)
379 dev->rx_info.buf_full_counter++;
380 dev->rx_info.buffer_full = true;
381 } else {
382 dev->rx_info.buffer_full = false;
383 }
384
385 if (buf_status & (BIT(PKT_BUFF_SEMI_FULL))) {
386 if (!dev->rx_info.semi_buffer_full)
387 dev->rx_info.buf_semi_full_counter++;
388 dev->rx_info.semi_buffer_full = true;
389 } else {
390 dev->rx_info.semi_buffer_full = false;
391 }
392
393 if (dev->rx_info.mgmt_buffer_full || dev->rx_info.buf_full_counter)
394 counter = 1;
395 else
396 counter = 4;
397
398 out:
399 if ((q_num == MGMT_SOFT_Q) && (dev->rx_info.mgmt_buffer_full))
400 return QUEUE_FULL;
401
402 if ((q_num < MGMT_SOFT_Q) && (dev->rx_info.buffer_full))
403 return QUEUE_FULL;
404
405 return QUEUE_NOT_FULL;
406 }
407
408 /**
409 * rsi_sdio_determine_event_timeout() - This Function determines the event
410 * timeout duration.
411 * @adapter: Pointer to the adapter structure.
412 *
413 * Return: timeout duration is returned.
414 */
rsi_sdio_determine_event_timeout(struct rsi_hw * adapter)415 int rsi_sdio_determine_event_timeout(struct rsi_hw *adapter)
416 {
417 struct rsi_91x_sdiodev *dev =
418 (struct rsi_91x_sdiodev *)adapter->rsi_dev;
419
420 /* Once buffer full is seen, event timeout to occur every 2 msecs */
421 if (dev->rx_info.buffer_full)
422 return 2;
423
424 return EVENT_WAIT_FOREVER;
425 }
426