2 * Copyright (c) 2014 Redpine Signals Inc.
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.
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.
18 #include <linux/firmware.h>
19 #include <net/rsi_91x.h>
21 #include "rsi_common.h"
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.
29 * Return: status: 0 on success, -1 on failure.
31 int rsi_sdio_master_access_msword(struct rsi_hw *adapter, u16 ms_word)
37 byte = (u8)(ms_word & 0x00FF);
40 "%s: MASTER_ACCESS_MSBYTE:0x%x\n", __func__, byte);
42 status = rsi_sdio_write_register(adapter,
44 SDIO_MASTER_ACCESS_MSBYTE,
48 "%s: fail to access MASTER_ACCESS_MSBYTE\n",
53 byte = (u8)(ms_word >> 8);
55 rsi_dbg(INIT_ZONE, "%s:MASTER_ACCESS_LSBYTE:0x%x\n", __func__, byte);
56 status = rsi_sdio_write_register(adapter,
58 SDIO_MASTER_ACCESS_LSBYTE,
63 static void rsi_rx_handler(struct rsi_hw *adapter);
65 void rsi_sdio_rx_thread(struct rsi_common *common)
67 struct rsi_hw *adapter = common->priv;
68 struct rsi_91x_sdiodev *sdev = adapter->rsi_dev;
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));
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);
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.
86 * Return: 0 on success, -1 on failure.
88 static int rsi_process_pkt(struct rsi_common *common)
90 struct rsi_hw *adapter = common->priv;
91 struct rsi_91x_sdiodev *dev =
92 (struct rsi_91x_sdiodev *)adapter->rsi_dev;
98 num_blks = ((adapter->interrupt_status & 1) |
99 ((adapter->interrupt_status >> RECV_NUM_BLOCKS) << 1));
102 status = rsi_sdio_read_register(adapter,
103 SDIO_RX_NUM_BLOCKS_REG,
107 "%s: Failed to read pkt length from the card:\n",
111 num_blks = value & 0x1f;
114 if (dev->write_fail == 2)
115 rsi_sdio_ack_intr(common->priv, (1 << MSDU_PKT_PENDING));
117 if (unlikely(!num_blks)) {
122 rcv_pkt_len = (num_blks * 256);
124 status = rsi_sdio_host_intf_read_pkt(adapter, dev->pktbuffer,
127 rsi_dbg(ERR_ZONE, "%s: Failed to read packet from card\n",
132 status = rsi_read_pkt(common, dev->pktbuffer, rcv_pkt_len);
134 rsi_dbg(ERR_ZONE, "Failed to read the packet\n");
142 * rsi_init_sdio_slave_regs() - This function does the actual initialization
143 * of SDBUS slave registers.
144 * @adapter: Pointer to the adapter structure.
146 * Return: status: 0 on success, -1 on failure.
148 int rsi_init_sdio_slave_regs(struct rsi_hw *adapter)
150 struct rsi_91x_sdiodev *dev =
151 (struct rsi_91x_sdiodev *)adapter->rsi_dev;
156 if (dev->next_read_delay) {
157 byte = dev->next_read_delay;
158 status = rsi_sdio_write_register(adapter,
164 "%s: Failed to write SDIO_NXT_RD_DELAY2\n",
170 if (dev->sdio_high_speed_enable) {
171 rsi_dbg(INIT_ZONE, "%s: Enabling SDIO High speed\n", __func__);
174 status = rsi_sdio_write_register(adapter,
180 "%s: Failed to enable SDIO high speed\n",
186 /* This tells SDIO FIFO when to start read to host */
187 rsi_dbg(INIT_ZONE, "%s: Initializing SDIO read start level\n", __func__);
190 status = rsi_sdio_write_register(adapter,
196 "%s: Failed to write SDIO_READ_START_LVL\n", __func__);
200 rsi_dbg(INIT_ZONE, "%s: Initializing FIFO ctrl registers\n", __func__);
203 status = rsi_sdio_write_register(adapter,
209 "%s: Failed to write SDIO_READ_FIFO_CTL\n", __func__);
214 status = rsi_sdio_write_register(adapter,
220 "%s: Failed to write SDIO_WRITE_FIFO_CTL\n", __func__);
228 * rsi_rx_handler() - Read and process SDIO interrupts.
229 * @adapter: Pointer to the adapter structure.
233 static void rsi_rx_handler(struct rsi_hw *adapter)
235 struct rsi_common *common = adapter->priv;
236 struct rsi_91x_sdiodev *dev =
237 (struct rsi_91x_sdiodev *)adapter->rsi_dev;
239 enum sdio_interrupt_type isr_type;
243 dev->rx_info.sdio_int_counter++;
246 mutex_lock(&common->rx_lock);
247 status = rsi_sdio_read_register(common->priv,
248 RSI_FN1_INT_REGISTER,
252 "%s: Failed to Read Intr Status Register\n",
254 mutex_unlock(&common->rx_lock);
257 adapter->interrupt_status = isr_status;
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);
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));
271 RSI_GET_SDIO_INTERRUPT_TYPE(isr_status, isr_type);
274 case BUFFER_AVAILABLE:
275 status = rsi_sdio_check_buffer_status(adapter,
279 "%s: Failed to check buffer status\n",
281 rsi_sdio_ack_intr(common->priv,
282 (1 << PKT_BUFF_AVAILABLE));
283 rsi_set_event(&common->tx_thread.event);
286 "%s: ==> BUFFER_AVAILABLE <==\n",
288 dev->buff_status_updated = true;
291 case FIRMWARE_ASSERT_IND:
293 "%s: ==> FIRMWARE Assert <==\n",
295 status = rsi_sdio_read_register(common->priv,
300 "%s: Failed to read f/w reg\n",
304 "%s: Firmware Status is 0x%x\n",
305 __func__ , fw_status);
306 rsi_sdio_ack_intr(common->priv,
307 (1 << FW_ASSERT_IND));
310 common->fsm_state = FSM_CARD_NOT_READY;
313 case MSDU_PACKET_PENDING:
314 rsi_dbg(ISR_ZONE, "Pkt pending interrupt\n");
315 dev->rx_info.total_sdio_msdu_pending_intr++;
317 status = rsi_process_pkt(common);
320 "%s: Failed to read pkt\n",
322 mutex_unlock(&common->rx_lock);
327 rsi_sdio_ack_intr(common->priv, isr_status);
328 dev->rx_info.total_sdio_unknown_intr++;
331 "Unknown Interrupt %x\n",
335 isr_status ^= BIT(isr_type - 1);
336 } while (isr_status);
337 mutex_unlock(&common->rx_lock);
341 /* This function is used to read buffer status register and
342 * set relevant fields in rsi_91x_sdiodev struct.
344 int rsi_sdio_check_buffer_status(struct rsi_hw *adapter, u8 q_num)
346 struct rsi_common *common = adapter->priv;
347 struct rsi_91x_sdiodev *dev =
348 (struct rsi_91x_sdiodev *)adapter->rsi_dev;
351 static int counter = 4;
353 if (!dev->buff_status_updated && counter) {
358 dev->buff_status_updated = false;
359 status = rsi_sdio_read_register(common->priv,
360 RSI_DEVICE_BUFFER_STATUS_REGISTER,
365 "%s: Failed to read status register\n", __func__);
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;
374 dev->rx_info.mgmt_buffer_full = false;
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;
382 dev->rx_info.buffer_full = false;
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;
390 dev->rx_info.semi_buffer_full = false;
393 if (dev->rx_info.mgmt_buffer_full || dev->rx_info.buf_full_counter)
399 if ((q_num == MGMT_SOFT_Q) && (dev->rx_info.mgmt_buffer_full))
402 if ((q_num < MGMT_SOFT_Q) && (dev->rx_info.buffer_full))
405 return QUEUE_NOT_FULL;
409 * rsi_sdio_determine_event_timeout() - This Function determines the event
411 * @adapter: Pointer to the adapter structure.
413 * Return: timeout duration is returned.
415 int rsi_sdio_determine_event_timeout(struct rsi_hw *adapter)
417 struct rsi_91x_sdiodev *dev =
418 (struct rsi_91x_sdiodev *)adapter->rsi_dev;
420 /* Once buffer full is seen, event timeout to occur every 2 msecs */
421 if (dev->rx_info.buffer_full)
424 return EVENT_WAIT_FOREVER;