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 */
31int 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
63static void rsi_rx_handler(struct rsi_hw *adapter);
64
65void 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 */
88static int rsi_process_pkt(struct rsi_common *common)
89{
90	struct rsi_hw *adapter = common->priv;
91	struct rsi_91x_sdiodev *dev = adapter->rsi_dev;
92	u8 num_blks = 0;
93	u32 rcv_pkt_len = 0;
94	int status = 0;
95	u8 value = 0;
96
97	num_blks = ((adapter->interrupt_status & 1) |
98			((adapter->interrupt_status >> RECV_NUM_BLOCKS) << 1));
99
100	if (!num_blks) {
101		status = rsi_sdio_read_register(adapter,
102						SDIO_RX_NUM_BLOCKS_REG,
103						&value);
104		if (status) {
105			rsi_dbg(ERR_ZONE,
106				"%s: Failed to read pkt length from the card:\n",
107				__func__);
108			return status;
109		}
110		num_blks = value & 0x1f;
111	}
112
113	if (dev->write_fail == 2)
114		rsi_sdio_ack_intr(common->priv, (1 << MSDU_PKT_PENDING));
115
116	if (unlikely(!num_blks)) {
117		dev->write_fail = 2;
118		return -1;
119	}
120
121	rcv_pkt_len = (num_blks * 256);
122
123	status = rsi_sdio_host_intf_read_pkt(adapter, dev->pktbuffer,
124					     rcv_pkt_len);
125	if (status) {
126		rsi_dbg(ERR_ZONE, "%s: Failed to read packet from card\n",
127			__func__);
128		return status;
129	}
130
131	status = rsi_read_pkt(common, dev->pktbuffer, rcv_pkt_len);
132	if (status) {
133		rsi_dbg(ERR_ZONE, "Failed to read the packet\n");
134		return status;
135	}
136
137	return 0;
138}
139
140/**
141 * rsi_init_sdio_slave_regs() - This function does the actual initialization
142 *				of SDBUS slave registers.
143 * @adapter: Pointer to the adapter structure.
144 *
145 * Return: status: 0 on success, -1 on failure.
146 */
147int rsi_init_sdio_slave_regs(struct rsi_hw *adapter)
148{
149	struct rsi_91x_sdiodev *dev = adapter->rsi_dev;
150	u8 function = 0;
151	u8 byte;
152	int status = 0;
153
154	if (dev->next_read_delay) {
155		byte = dev->next_read_delay;
156		status = rsi_sdio_write_register(adapter,
157						 function,
158						 SDIO_NXT_RD_DELAY2,
159						 &byte);
160		if (status) {
161			rsi_dbg(ERR_ZONE,
162				"%s: Failed to write SDIO_NXT_RD_DELAY2\n",
163				__func__);
164			return -1;
165		}
166	}
167
168	if (dev->sdio_high_speed_enable) {
169		rsi_dbg(INIT_ZONE, "%s: Enabling SDIO High speed\n", __func__);
170		byte = 0x3;
171
172		status = rsi_sdio_write_register(adapter,
173						 function,
174						 SDIO_REG_HIGH_SPEED,
175						 &byte);
176		if (status) {
177			rsi_dbg(ERR_ZONE,
178				"%s: Failed to enable SDIO high speed\n",
179				__func__);
180			return -1;
181		}
182	}
183
184	/* This tells SDIO FIFO when to start read to host */
185	rsi_dbg(INIT_ZONE, "%s: Initializing SDIO read start level\n", __func__);
186	byte = 0x24;
187
188	status = rsi_sdio_write_register(adapter,
189					 function,
190					 SDIO_READ_START_LVL,
191					 &byte);
192	if (status) {
193		rsi_dbg(ERR_ZONE,
194			"%s: Failed to write SDIO_READ_START_LVL\n", __func__);
195		return -1;
196	}
197
198	rsi_dbg(INIT_ZONE, "%s: Initializing FIFO ctrl registers\n", __func__);
199	byte = (128 - 32);
200
201	status = rsi_sdio_write_register(adapter,
202					 function,
203					 SDIO_READ_FIFO_CTL,
204					 &byte);
205	if (status) {
206		rsi_dbg(ERR_ZONE,
207			"%s: Failed to write SDIO_READ_FIFO_CTL\n", __func__);
208		return -1;
209	}
210
211	byte = 32;
212	status = rsi_sdio_write_register(adapter,
213					 function,
214					 SDIO_WRITE_FIFO_CTL,
215					 &byte);
216	if (status) {
217		rsi_dbg(ERR_ZONE,
218			"%s: Failed to write SDIO_WRITE_FIFO_CTL\n", __func__);
219		return -1;
220	}
221
222	return 0;
223}
224
225/**
226 * rsi_rx_handler() - Read and process SDIO interrupts.
227 * @adapter: Pointer to the adapter structure.
228 *
229 * Return: None.
230 */
231static void rsi_rx_handler(struct rsi_hw *adapter)
232{
233	struct rsi_common *common = adapter->priv;
234	struct rsi_91x_sdiodev *dev = adapter->rsi_dev;
235	int status;
236	u8 isr_status = 0;
237	u8 fw_status = 0;
238
239	dev->rx_info.sdio_int_counter++;
240
241	do {
242		mutex_lock(&common->rx_lock);
243		status = rsi_sdio_read_register(common->priv,
244						RSI_FN1_INT_REGISTER,
245						&isr_status);
246		if (status) {
247			rsi_dbg(ERR_ZONE,
248				"%s: Failed to Read Intr Status Register\n",
249				__func__);
250			mutex_unlock(&common->rx_lock);
251			return;
252		}
253		adapter->interrupt_status = isr_status;
254
255		if (isr_status == 0) {
256			rsi_set_event(&common->tx_thread.event);
257			dev->rx_info.sdio_intr_status_zero++;
258			mutex_unlock(&common->rx_lock);
259			return;
260		}
261
262		rsi_dbg(ISR_ZONE, "%s: Intr_status = %x %d %d\n",
263			__func__, isr_status, (1 << MSDU_PKT_PENDING),
264			(1 << FW_ASSERT_IND));
265
266		if (isr_status & BIT(PKT_BUFF_AVAILABLE)) {
267			status = rsi_sdio_check_buffer_status(adapter, 0);
268			if (status < 0)
269				rsi_dbg(ERR_ZONE,
270					"%s: Failed to check buffer status\n",
271					__func__);
272			rsi_sdio_ack_intr(common->priv,
273					  BIT(PKT_BUFF_AVAILABLE));
274			rsi_set_event(&common->tx_thread.event);
275
276			rsi_dbg(ISR_ZONE, "%s: ==> BUFFER_AVAILABLE <==\n",
277				__func__);
278			dev->buff_status_updated = true;
279
280			isr_status &= ~BIT(PKT_BUFF_AVAILABLE);
281		}
282
283		if (isr_status & BIT(FW_ASSERT_IND)) {
284			rsi_dbg(ERR_ZONE, "%s: ==> FIRMWARE Assert <==\n",
285				__func__);
286			status = rsi_sdio_read_register(common->priv,
287							SDIO_FW_STATUS_REG,
288							&fw_status);
289			if (status) {
290				rsi_dbg(ERR_ZONE,
291					"%s: Failed to read f/w reg\n",
292					__func__);
293			} else {
294				rsi_dbg(ERR_ZONE,
295					"%s: Firmware Status is 0x%x\n",
296					__func__, fw_status);
297				rsi_sdio_ack_intr(common->priv,
298						  BIT(FW_ASSERT_IND));
299			}
300
301			common->fsm_state = FSM_CARD_NOT_READY;
302
303			isr_status &= ~BIT(FW_ASSERT_IND);
304		}
305
306		if (isr_status & BIT(MSDU_PKT_PENDING)) {
307			rsi_dbg(ISR_ZONE, "Pkt pending interrupt\n");
308			dev->rx_info.total_sdio_msdu_pending_intr++;
309
310			status = rsi_process_pkt(common);
311			if (status) {
312				rsi_dbg(ERR_ZONE, "%s: Failed to read pkt\n",
313					__func__);
314				mutex_unlock(&common->rx_lock);
315				return;
316			}
317
318			isr_status &= ~BIT(MSDU_PKT_PENDING);
319		}
320
321		if (isr_status) {
322			rsi_sdio_ack_intr(common->priv, isr_status);
323			dev->rx_info.total_sdio_unknown_intr++;
324			isr_status = 0;
325			rsi_dbg(ISR_ZONE, "Unknown Interrupt %x\n",
326				isr_status);
327		}
328
329		mutex_unlock(&common->rx_lock);
330	} while (1);
331}
332
333/* This function is used to read buffer status register and
334 * set relevant fields in rsi_91x_sdiodev struct.
335 */
336int rsi_sdio_check_buffer_status(struct rsi_hw *adapter, u8 q_num)
337{
338	struct rsi_common *common = adapter->priv;
339	struct rsi_91x_sdiodev *dev = adapter->rsi_dev;
340	u8 buf_status = 0;
341	int status = 0;
342	static int counter = 4;
343
344	if (!dev->buff_status_updated && counter) {
345		counter--;
346		goto out;
347	}
348
349	dev->buff_status_updated = false;
350	status = rsi_sdio_read_register(common->priv,
351					RSI_DEVICE_BUFFER_STATUS_REGISTER,
352					&buf_status);
353
354	if (status) {
355		rsi_dbg(ERR_ZONE,
356			"%s: Failed to read status register\n", __func__);
357		return -1;
358	}
359
360	if (buf_status & (BIT(PKT_MGMT_BUFF_FULL))) {
361		if (!dev->rx_info.mgmt_buffer_full)
362			dev->rx_info.mgmt_buf_full_counter++;
363		dev->rx_info.mgmt_buffer_full = true;
364	} else {
365		dev->rx_info.mgmt_buffer_full = false;
366	}
367
368	if (buf_status & (BIT(PKT_BUFF_FULL))) {
369		if (!dev->rx_info.buffer_full)
370			dev->rx_info.buf_full_counter++;
371		dev->rx_info.buffer_full = true;
372	} else {
373		dev->rx_info.buffer_full = false;
374	}
375
376	if (buf_status & (BIT(PKT_BUFF_SEMI_FULL))) {
377		if (!dev->rx_info.semi_buffer_full)
378			dev->rx_info.buf_semi_full_counter++;
379		dev->rx_info.semi_buffer_full = true;
380	} else {
381		dev->rx_info.semi_buffer_full = false;
382	}
383
384	if (dev->rx_info.mgmt_buffer_full || dev->rx_info.buf_full_counter)
385		counter = 1;
386	else
387		counter = 4;
388
389out:
390	if ((q_num == MGMT_SOFT_Q) && (dev->rx_info.mgmt_buffer_full))
391		return QUEUE_FULL;
392
393	if ((q_num < MGMT_SOFT_Q) && (dev->rx_info.buffer_full))
394		return QUEUE_FULL;
395
396	return QUEUE_NOT_FULL;
397}
398
399/**
400 * rsi_sdio_determine_event_timeout() - This Function determines the event
401 *					timeout duration.
402 * @adapter: Pointer to the adapter structure.
403 *
404 * Return: timeout duration is returned.
405 */
406int rsi_sdio_determine_event_timeout(struct rsi_hw *adapter)
407{
408	struct rsi_91x_sdiodev *dev = adapter->rsi_dev;
409
410	/* Once buffer full is seen, event timeout to occur every 2 msecs */
411	if (dev->rx_info.buffer_full)
412		return 2;
413
414	return EVENT_WAIT_FOREVER;
415}
416