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>
20 #include "rsi_common.h"
23 * rsi_sdio_master_access_msword() - This function sets the AHB master access
24 * MS word in the SDIO slave registers.
25 * @adapter: Pointer to the adapter structure.
26 * @ms_word: ms word need to be initialized.
28 * Return: status: 0 on success, -1 on failure.
30 int rsi_sdio_master_access_msword(struct rsi_hw *adapter, u16 ms_word)
36 byte = (u8)(ms_word & 0x00FF);
39 "%s: MASTER_ACCESS_MSBYTE:0x%x\n", __func__, byte);
41 status = rsi_sdio_write_register(adapter,
43 SDIO_MASTER_ACCESS_MSBYTE,
47 "%s: fail to access MASTER_ACCESS_MSBYTE\n",
52 byte = (u8)(ms_word >> 8);
54 rsi_dbg(INIT_ZONE, "%s:MASTER_ACCESS_LSBYTE:0x%x\n", __func__, byte);
55 status = rsi_sdio_write_register(adapter,
57 SDIO_MASTER_ACCESS_LSBYTE,
63 * rsi_process_pkt() - This Function reads rx_blocks register and figures out
64 * the size of the rx pkt.
65 * @common: Pointer to the driver private structure.
67 * Return: 0 on success, -1 on failure.
69 static int rsi_process_pkt(struct rsi_common *common)
71 struct rsi_hw *adapter = common->priv;
72 struct rsi_91x_sdiodev *dev =
73 (struct rsi_91x_sdiodev *)adapter->rsi_dev;
79 num_blks = ((adapter->interrupt_status & 1) |
80 ((adapter->interrupt_status >> RECV_NUM_BLOCKS) << 1));
83 status = rsi_sdio_read_register(adapter,
84 SDIO_RX_NUM_BLOCKS_REG,
88 "%s: Failed to read pkt length from the card:\n",
92 num_blks = value & 0x1f;
95 if (dev->write_fail == 2)
96 rsi_sdio_ack_intr(common->priv, (1 << MSDU_PKT_PENDING));
98 if (unlikely(!num_blks)) {
103 rcv_pkt_len = (num_blks * 256);
105 common->rx_data_pkt = kmalloc(rcv_pkt_len, GFP_KERNEL);
106 if (!common->rx_data_pkt) {
107 rsi_dbg(ERR_ZONE, "%s: Failed in memory allocation\n",
112 status = rsi_sdio_host_intf_read_pkt(adapter,
116 rsi_dbg(ERR_ZONE, "%s: Failed to read packet from card\n",
121 status = rsi_read_pkt(common, rcv_pkt_len);
124 kfree(common->rx_data_pkt);
129 * rsi_init_sdio_slave_regs() - This function does the actual initialization
130 * of SDBUS slave registers.
131 * @adapter: Pointer to the adapter structure.
133 * Return: status: 0 on success, -1 on failure.
135 int rsi_init_sdio_slave_regs(struct rsi_hw *adapter)
137 struct rsi_91x_sdiodev *dev =
138 (struct rsi_91x_sdiodev *)adapter->rsi_dev;
143 if (dev->next_read_delay) {
144 byte = dev->next_read_delay;
145 status = rsi_sdio_write_register(adapter,
151 "%s: Failed to write SDIO_NXT_RD_DELAY2\n",
157 if (dev->sdio_high_speed_enable) {
158 rsi_dbg(INIT_ZONE, "%s: Enabling SDIO High speed\n", __func__);
161 status = rsi_sdio_write_register(adapter,
167 "%s: Failed to enable SDIO high speed\n",
173 /* This tells SDIO FIFO when to start read to host */
174 rsi_dbg(INIT_ZONE, "%s: Initialzing SDIO read start level\n", __func__);
177 status = rsi_sdio_write_register(adapter,
183 "%s: Failed to write SDIO_READ_START_LVL\n", __func__);
187 rsi_dbg(INIT_ZONE, "%s: Initialzing FIFO ctrl registers\n", __func__);
190 status = rsi_sdio_write_register(adapter,
196 "%s: Failed to write SDIO_READ_FIFO_CTL\n", __func__);
201 status = rsi_sdio_write_register(adapter,
207 "%s: Failed to write SDIO_WRITE_FIFO_CTL\n", __func__);
215 * rsi_interrupt_handler() - This function read and process SDIO interrupts.
216 * @adapter: Pointer to the adapter structure.
220 void rsi_interrupt_handler(struct rsi_hw *adapter)
222 struct rsi_common *common = adapter->priv;
223 struct rsi_91x_sdiodev *dev =
224 (struct rsi_91x_sdiodev *)adapter->rsi_dev;
226 enum sdio_interrupt_type isr_type;
230 dev->rx_info.sdio_int_counter++;
233 mutex_lock(&common->rx_lock);
234 status = rsi_sdio_read_register(common->priv,
235 RSI_FN1_INT_REGISTER,
239 "%s: Failed to Read Intr Status Register\n",
241 mutex_unlock(&common->rx_lock);
244 adapter->interrupt_status = isr_status;
246 if (isr_status == 0) {
247 rsi_set_event(&common->tx_thread.event);
248 dev->rx_info.sdio_intr_status_zero++;
249 mutex_unlock(&common->rx_lock);
253 rsi_dbg(ISR_ZONE, "%s: Intr_status = %x %d %d\n",
254 __func__, isr_status, (1 << MSDU_PKT_PENDING),
255 (1 << FW_ASSERT_IND));
258 RSI_GET_SDIO_INTERRUPT_TYPE(isr_status, isr_type);
261 case BUFFER_AVAILABLE:
262 status = rsi_sdio_check_buffer_status(adapter,
266 "%s: Failed to check buffer status\n",
268 rsi_sdio_ack_intr(common->priv,
269 (1 << PKT_BUFF_AVAILABLE));
270 rsi_set_event(&common->tx_thread.event);
273 "%s: ==> BUFFER_AVAILABLE <==\n",
275 dev->buff_status_updated = true;
278 case FIRMWARE_ASSERT_IND:
280 "%s: ==> FIRMWARE Assert <==\n",
282 status = rsi_sdio_read_register(common->priv,
287 "%s: Failed to read f/w reg\n",
291 "%s: Firmware Status is 0x%x\n",
292 __func__ , fw_status);
293 rsi_sdio_ack_intr(common->priv,
294 (1 << FW_ASSERT_IND));
297 common->fsm_state = FSM_CARD_NOT_READY;
300 case MSDU_PACKET_PENDING:
301 rsi_dbg(ISR_ZONE, "Pkt pending interrupt\n");
302 dev->rx_info.total_sdio_msdu_pending_intr++;
304 status = rsi_process_pkt(common);
307 "%s: Failed to read pkt\n",
309 mutex_unlock(&common->rx_lock);
314 rsi_sdio_ack_intr(common->priv, isr_status);
315 dev->rx_info.total_sdio_unknown_intr++;
318 "Unknown Interrupt %x\n",
322 isr_status ^= BIT(isr_type - 1);
323 } while (isr_status);
324 mutex_unlock(&common->rx_lock);
328 /* This function is used to read buffer status register and
329 * set relevant fields in rsi_91x_sdiodev struct.
331 int rsi_sdio_check_buffer_status(struct rsi_hw *adapter, u8 q_num)
333 struct rsi_common *common = adapter->priv;
334 struct rsi_91x_sdiodev *dev =
335 (struct rsi_91x_sdiodev *)adapter->rsi_dev;
338 static int counter = 4;
340 if (!dev->buff_status_updated && counter) {
345 dev->buff_status_updated = false;
346 status = rsi_sdio_read_register(common->priv,
347 RSI_DEVICE_BUFFER_STATUS_REGISTER,
352 "%s: Failed to read status register\n", __func__);
356 if (buf_status & (BIT(PKT_MGMT_BUFF_FULL))) {
357 if (!dev->rx_info.mgmt_buffer_full)
358 dev->rx_info.mgmt_buf_full_counter++;
359 dev->rx_info.mgmt_buffer_full = true;
361 dev->rx_info.mgmt_buffer_full = false;
364 if (buf_status & (BIT(PKT_BUFF_FULL))) {
365 if (!dev->rx_info.buffer_full)
366 dev->rx_info.buf_full_counter++;
367 dev->rx_info.buffer_full = true;
369 dev->rx_info.buffer_full = false;
372 if (buf_status & (BIT(PKT_BUFF_SEMI_FULL))) {
373 if (!dev->rx_info.semi_buffer_full)
374 dev->rx_info.buf_semi_full_counter++;
375 dev->rx_info.semi_buffer_full = true;
377 dev->rx_info.semi_buffer_full = false;
380 if (dev->rx_info.mgmt_buffer_full || dev->rx_info.buf_full_counter)
386 if ((q_num == MGMT_SOFT_Q) && (dev->rx_info.mgmt_buffer_full))
389 if ((q_num < MGMT_SOFT_Q) && (dev->rx_info.buffer_full))
392 return QUEUE_NOT_FULL;
396 * rsi_sdio_determine_event_timeout() - This Function determines the event
398 * @adapter: Pointer to the adapter structure.
400 * Return: timeout duration is returned.
402 int rsi_sdio_determine_event_timeout(struct rsi_hw *adapter)
404 struct rsi_91x_sdiodev *dev =
405 (struct rsi_91x_sdiodev *)adapter->rsi_dev;
407 /* Once buffer full is seen, event timeout to occur every 2 msecs */
408 if (dev->rx_info.buffer_full)
411 return EVENT_WAIT_FOREVER;