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1/*
2 * linux/drivers/net/wireless/libertas/if_spi.c
3 *
4 * Driver for Marvell SPI WLAN cards.
5 *
6 * Copyright 2008 Analog Devices Inc.
7 *
8 * Authors:
9 * Andrey Yurovsky <andrey@cozybit.com>
10 * Colin McCabe <colin@cozybit.com>
11 *
12 * Inspired by if_sdio.c, Copyright 2007-2008 Pierre Ossman
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 */
19
20#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
21
22#include <linux/hardirq.h>
23#include <linux/interrupt.h>
24#include <linux/module.h>
25#include <linux/firmware.h>
26#include <linux/jiffies.h>
27#include <linux/list.h>
28#include <linux/netdevice.h>
29#include <linux/slab.h>
30#include <linux/spi/libertas_spi.h>
31#include <linux/spi/spi.h>
32
33#include "host.h"
34#include "decl.h"
35#include "defs.h"
36#include "dev.h"
37#include "if_spi.h"
38
39struct if_spi_packet {
40 struct list_head list;
41 u16 blen;
42 u8 buffer[0] __attribute__((aligned(4)));
43};
44
45struct if_spi_card {
46 struct spi_device *spi;
47 struct lbs_private *priv;
48 struct libertas_spi_platform_data *pdata;
49
50 /* The card ID and card revision, as reported by the hardware. */
51 u16 card_id;
52 u8 card_rev;
53
54 /* The last time that we initiated an SPU operation */
55 unsigned long prev_xfer_time;
56
57 int use_dummy_writes;
58 unsigned long spu_port_delay;
59 unsigned long spu_reg_delay;
60
61 /* Handles all SPI communication (except for FW load) */
62 struct workqueue_struct *workqueue;
63 struct work_struct packet_work;
64 struct work_struct resume_work;
65
66 u8 cmd_buffer[IF_SPI_CMD_BUF_SIZE];
67
68 /* A buffer of incoming packets from libertas core.
69 * Since we can't sleep in hw_host_to_card, we have to buffer
70 * them. */
71 struct list_head cmd_packet_list;
72 struct list_head data_packet_list;
73
74 /* Protects cmd_packet_list and data_packet_list */
75 spinlock_t buffer_lock;
76
77 /* True is card suspended */
78 u8 suspended;
79};
80
81static void free_if_spi_card(struct if_spi_card *card)
82{
83 struct list_head *cursor, *next;
84 struct if_spi_packet *packet;
85
86 list_for_each_safe(cursor, next, &card->cmd_packet_list) {
87 packet = container_of(cursor, struct if_spi_packet, list);
88 list_del(&packet->list);
89 kfree(packet);
90 }
91 list_for_each_safe(cursor, next, &card->data_packet_list) {
92 packet = container_of(cursor, struct if_spi_packet, list);
93 list_del(&packet->list);
94 kfree(packet);
95 }
96 spi_set_drvdata(card->spi, NULL);
97 kfree(card);
98}
99
100#define MODEL_8385 0x04
101#define MODEL_8686 0x0b
102#define MODEL_8688 0x10
103
104static const struct lbs_fw_table fw_table[] = {
105 { MODEL_8385, "libertas/gspi8385_helper.bin", "libertas/gspi8385.bin" },
106 { MODEL_8385, "libertas/gspi8385_hlp.bin", "libertas/gspi8385.bin" },
107 { MODEL_8686, "libertas/gspi8686_v9_helper.bin", "libertas/gspi8686_v9.bin" },
108 { MODEL_8686, "libertas/gspi8686_hlp.bin", "libertas/gspi8686.bin" },
109 { MODEL_8688, "libertas/gspi8688_helper.bin", "libertas/gspi8688.bin" },
110 { 0, NULL, NULL }
111};
112MODULE_FIRMWARE("libertas/gspi8385_helper.bin");
113MODULE_FIRMWARE("libertas/gspi8385_hlp.bin");
114MODULE_FIRMWARE("libertas/gspi8385.bin");
115MODULE_FIRMWARE("libertas/gspi8686_v9_helper.bin");
116MODULE_FIRMWARE("libertas/gspi8686_v9.bin");
117MODULE_FIRMWARE("libertas/gspi8686_hlp.bin");
118MODULE_FIRMWARE("libertas/gspi8686.bin");
119MODULE_FIRMWARE("libertas/gspi8688_helper.bin");
120MODULE_FIRMWARE("libertas/gspi8688.bin");
121
122
123/*
124 * SPI Interface Unit Routines
125 *
126 * The SPU sits between the host and the WLAN module.
127 * All communication with the firmware is through SPU transactions.
128 *
129 * First we have to put a SPU register name on the bus. Then we can
130 * either read from or write to that register.
131 *
132 */
133
134static void spu_transaction_init(struct if_spi_card *card)
135{
136 if (!time_after(jiffies, card->prev_xfer_time + 1)) {
137 /* Unfortunately, the SPU requires a delay between successive
138 * transactions. If our last transaction was more than a jiffy
139 * ago, we have obviously already delayed enough.
140 * If not, we have to busy-wait to be on the safe side. */
141 ndelay(400);
142 }
143}
144
145static void spu_transaction_finish(struct if_spi_card *card)
146{
147 card->prev_xfer_time = jiffies;
148}
149
150/*
151 * Write out a byte buffer to an SPI register,
152 * using a series of 16-bit transfers.
153 */
154static int spu_write(struct if_spi_card *card, u16 reg, const u8 *buf, int len)
155{
156 int err = 0;
157 __le16 reg_out = cpu_to_le16(reg | IF_SPI_WRITE_OPERATION_MASK);
158 struct spi_message m;
159 struct spi_transfer reg_trans;
160 struct spi_transfer data_trans;
161
162 spi_message_init(&m);
163 memset(®_trans, 0, sizeof(reg_trans));
164 memset(&data_trans, 0, sizeof(data_trans));
165
166 /* You must give an even number of bytes to the SPU, even if it
167 * doesn't care about the last one. */
168 BUG_ON(len & 0x1);
169
170 spu_transaction_init(card);
171
172 /* write SPU register index */
173 reg_trans.tx_buf = ®_out;
174 reg_trans.len = sizeof(reg_out);
175
176 data_trans.tx_buf = buf;
177 data_trans.len = len;
178
179 spi_message_add_tail(®_trans, &m);
180 spi_message_add_tail(&data_trans, &m);
181
182 err = spi_sync(card->spi, &m);
183 spu_transaction_finish(card);
184 return err;
185}
186
187static inline int spu_write_u16(struct if_spi_card *card, u16 reg, u16 val)
188{
189 __le16 buff;
190
191 buff = cpu_to_le16(val);
192 return spu_write(card, reg, (u8 *)&buff, sizeof(u16));
193}
194
195static inline int spu_reg_is_port_reg(u16 reg)
196{
197 switch (reg) {
198 case IF_SPI_IO_RDWRPORT_REG:
199 case IF_SPI_CMD_RDWRPORT_REG:
200 case IF_SPI_DATA_RDWRPORT_REG:
201 return 1;
202 default:
203 return 0;
204 }
205}
206
207static int spu_read(struct if_spi_card *card, u16 reg, u8 *buf, int len)
208{
209 unsigned int delay;
210 int err = 0;
211 __le16 reg_out = cpu_to_le16(reg | IF_SPI_READ_OPERATION_MASK);
212 struct spi_message m;
213 struct spi_transfer reg_trans;
214 struct spi_transfer dummy_trans;
215 struct spi_transfer data_trans;
216
217 /*
218 * You must take an even number of bytes from the SPU, even if you
219 * don't care about the last one.
220 */
221 BUG_ON(len & 0x1);
222
223 spu_transaction_init(card);
224
225 spi_message_init(&m);
226 memset(®_trans, 0, sizeof(reg_trans));
227 memset(&dummy_trans, 0, sizeof(dummy_trans));
228 memset(&data_trans, 0, sizeof(data_trans));
229
230 /* write SPU register index */
231 reg_trans.tx_buf = ®_out;
232 reg_trans.len = sizeof(reg_out);
233 spi_message_add_tail(®_trans, &m);
234
235 delay = spu_reg_is_port_reg(reg) ? card->spu_port_delay :
236 card->spu_reg_delay;
237 if (card->use_dummy_writes) {
238 /* Clock in dummy cycles while the SPU fills the FIFO */
239 dummy_trans.len = delay / 8;
240 spi_message_add_tail(&dummy_trans, &m);
241 } else {
242 /* Busy-wait while the SPU fills the FIFO */
243 reg_trans.delay_usecs =
244 DIV_ROUND_UP((100 + (delay * 10)), 1000);
245 }
246
247 /* read in data */
248 data_trans.rx_buf = buf;
249 data_trans.len = len;
250 spi_message_add_tail(&data_trans, &m);
251
252 err = spi_sync(card->spi, &m);
253 spu_transaction_finish(card);
254 return err;
255}
256
257/* Read 16 bits from an SPI register */
258static inline int spu_read_u16(struct if_spi_card *card, u16 reg, u16 *val)
259{
260 __le16 buf;
261 int ret;
262
263 ret = spu_read(card, reg, (u8 *)&buf, sizeof(buf));
264 if (ret == 0)
265 *val = le16_to_cpup(&buf);
266 return ret;
267}
268
269/*
270 * Read 32 bits from an SPI register.
271 * The low 16 bits are read first.
272 */
273static int spu_read_u32(struct if_spi_card *card, u16 reg, u32 *val)
274{
275 __le32 buf;
276 int err;
277
278 err = spu_read(card, reg, (u8 *)&buf, sizeof(buf));
279 if (!err)
280 *val = le32_to_cpup(&buf);
281 return err;
282}
283
284/*
285 * Keep reading 16 bits from an SPI register until you get the correct result.
286 *
287 * If mask = 0, the correct result is any non-zero number.
288 * If mask != 0, the correct result is any number where
289 * number & target_mask == target
290 *
291 * Returns -ETIMEDOUT if a second passes without the correct result.
292 */
293static int spu_wait_for_u16(struct if_spi_card *card, u16 reg,
294 u16 target_mask, u16 target)
295{
296 int err;
297 unsigned long timeout = jiffies + 5*HZ;
298 while (1) {
299 u16 val;
300 err = spu_read_u16(card, reg, &val);
301 if (err)
302 return err;
303 if (target_mask) {
304 if ((val & target_mask) == target)
305 return 0;
306 } else {
307 if (val)
308 return 0;
309 }
310 udelay(100);
311 if (time_after(jiffies, timeout)) {
312 pr_err("%s: timeout with val=%02x, target_mask=%02x, target=%02x\n",
313 __func__, val, target_mask, target);
314 return -ETIMEDOUT;
315 }
316 }
317}
318
319/*
320 * Read 16 bits from an SPI register until you receive a specific value.
321 * Returns -ETIMEDOUT if a 4 tries pass without success.
322 */
323static int spu_wait_for_u32(struct if_spi_card *card, u32 reg, u32 target)
324{
325 int err, try;
326 for (try = 0; try < 4; ++try) {
327 u32 val = 0;
328 err = spu_read_u32(card, reg, &val);
329 if (err)
330 return err;
331 if (val == target)
332 return 0;
333 mdelay(100);
334 }
335 return -ETIMEDOUT;
336}
337
338static int spu_set_interrupt_mode(struct if_spi_card *card,
339 int suppress_host_int,
340 int auto_int)
341{
342 int err = 0;
343
344 /*
345 * We can suppress a host interrupt by clearing the appropriate
346 * bit in the "host interrupt status mask" register
347 */
348 if (suppress_host_int) {
349 err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_MASK_REG, 0);
350 if (err)
351 return err;
352 } else {
353 err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_MASK_REG,
354 IF_SPI_HISM_TX_DOWNLOAD_RDY |
355 IF_SPI_HISM_RX_UPLOAD_RDY |
356 IF_SPI_HISM_CMD_DOWNLOAD_RDY |
357 IF_SPI_HISM_CARDEVENT |
358 IF_SPI_HISM_CMD_UPLOAD_RDY);
359 if (err)
360 return err;
361 }
362
363 /*
364 * If auto-interrupts are on, the completion of certain transactions
365 * will trigger an interrupt automatically. If auto-interrupts
366 * are off, we need to set the "Card Interrupt Cause" register to
367 * trigger a card interrupt.
368 */
369 if (auto_int) {
370 err = spu_write_u16(card, IF_SPI_HOST_INT_CTRL_REG,
371 IF_SPI_HICT_TX_DOWNLOAD_OVER_AUTO |
372 IF_SPI_HICT_RX_UPLOAD_OVER_AUTO |
373 IF_SPI_HICT_CMD_DOWNLOAD_OVER_AUTO |
374 IF_SPI_HICT_CMD_UPLOAD_OVER_AUTO);
375 if (err)
376 return err;
377 } else {
378 err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_MASK_REG, 0);
379 if (err)
380 return err;
381 }
382 return err;
383}
384
385static int spu_get_chip_revision(struct if_spi_card *card,
386 u16 *card_id, u8 *card_rev)
387{
388 int err = 0;
389 u32 dev_ctrl;
390 err = spu_read_u32(card, IF_SPI_DEVICEID_CTRL_REG, &dev_ctrl);
391 if (err)
392 return err;
393 *card_id = IF_SPI_DEVICEID_CTRL_REG_TO_CARD_ID(dev_ctrl);
394 *card_rev = IF_SPI_DEVICEID_CTRL_REG_TO_CARD_REV(dev_ctrl);
395 return err;
396}
397
398static int spu_set_bus_mode(struct if_spi_card *card, u16 mode)
399{
400 int err = 0;
401 u16 rval;
402 /* set bus mode */
403 err = spu_write_u16(card, IF_SPI_SPU_BUS_MODE_REG, mode);
404 if (err)
405 return err;
406 /* Check that we were able to read back what we just wrote. */
407 err = spu_read_u16(card, IF_SPI_SPU_BUS_MODE_REG, &rval);
408 if (err)
409 return err;
410 if ((rval & 0xF) != mode) {
411 pr_err("Can't read bus mode register\n");
412 return -EIO;
413 }
414 return 0;
415}
416
417static int spu_init(struct if_spi_card *card, int use_dummy_writes)
418{
419 int err = 0;
420 u32 delay;
421
422 /*
423 * We have to start up in timed delay mode so that we can safely
424 * read the Delay Read Register.
425 */
426 card->use_dummy_writes = 0;
427 err = spu_set_bus_mode(card,
428 IF_SPI_BUS_MODE_SPI_CLOCK_PHASE_RISING |
429 IF_SPI_BUS_MODE_DELAY_METHOD_TIMED |
430 IF_SPI_BUS_MODE_16_BIT_ADDRESS_16_BIT_DATA);
431 if (err)
432 return err;
433 card->spu_port_delay = 1000;
434 card->spu_reg_delay = 1000;
435 err = spu_read_u32(card, IF_SPI_DELAY_READ_REG, &delay);
436 if (err)
437 return err;
438 card->spu_port_delay = delay & 0x0000ffff;
439 card->spu_reg_delay = (delay & 0xffff0000) >> 16;
440
441 /* If dummy clock delay mode has been requested, switch to it now */
442 if (use_dummy_writes) {
443 card->use_dummy_writes = 1;
444 err = spu_set_bus_mode(card,
445 IF_SPI_BUS_MODE_SPI_CLOCK_PHASE_RISING |
446 IF_SPI_BUS_MODE_DELAY_METHOD_DUMMY_CLOCK |
447 IF_SPI_BUS_MODE_16_BIT_ADDRESS_16_BIT_DATA);
448 if (err)
449 return err;
450 }
451
452 lbs_deb_spi("Initialized SPU unit. "
453 "spu_port_delay=0x%04lx, spu_reg_delay=0x%04lx\n",
454 card->spu_port_delay, card->spu_reg_delay);
455 return err;
456}
457
458/*
459 * Firmware Loading
460 */
461
462static int if_spi_prog_helper_firmware(struct if_spi_card *card,
463 const struct firmware *firmware)
464{
465 int err = 0;
466 int bytes_remaining;
467 const u8 *fw;
468 u8 temp[HELPER_FW_LOAD_CHUNK_SZ];
469
470 lbs_deb_enter(LBS_DEB_SPI);
471
472 err = spu_set_interrupt_mode(card, 1, 0);
473 if (err)
474 goto out;
475
476 bytes_remaining = firmware->size;
477 fw = firmware->data;
478
479 /* Load helper firmware image */
480 while (bytes_remaining > 0) {
481 /*
482 * Scratch pad 1 should contain the number of bytes we
483 * want to download to the firmware
484 */
485 err = spu_write_u16(card, IF_SPI_SCRATCH_1_REG,
486 HELPER_FW_LOAD_CHUNK_SZ);
487 if (err)
488 goto out;
489
490 err = spu_wait_for_u16(card, IF_SPI_HOST_INT_STATUS_REG,
491 IF_SPI_HIST_CMD_DOWNLOAD_RDY,
492 IF_SPI_HIST_CMD_DOWNLOAD_RDY);
493 if (err)
494 goto out;
495
496 /*
497 * Feed the data into the command read/write port reg
498 * in chunks of 64 bytes
499 */
500 memset(temp, 0, sizeof(temp));
501 memcpy(temp, fw,
502 min(bytes_remaining, HELPER_FW_LOAD_CHUNK_SZ));
503 mdelay(10);
504 err = spu_write(card, IF_SPI_CMD_RDWRPORT_REG,
505 temp, HELPER_FW_LOAD_CHUNK_SZ);
506 if (err)
507 goto out;
508
509 /* Interrupt the boot code */
510 err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_REG, 0);
511 if (err)
512 goto out;
513 err = spu_write_u16(card, IF_SPI_CARD_INT_CAUSE_REG,
514 IF_SPI_CIC_CMD_DOWNLOAD_OVER);
515 if (err)
516 goto out;
517 bytes_remaining -= HELPER_FW_LOAD_CHUNK_SZ;
518 fw += HELPER_FW_LOAD_CHUNK_SZ;
519 }
520
521 /*
522 * Once the helper / single stage firmware download is complete,
523 * write 0 to scratch pad 1 and interrupt the
524 * bootloader. This completes the helper download.
525 */
526 err = spu_write_u16(card, IF_SPI_SCRATCH_1_REG, FIRMWARE_DNLD_OK);
527 if (err)
528 goto out;
529 err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_REG, 0);
530 if (err)
531 goto out;
532 err = spu_write_u16(card, IF_SPI_CARD_INT_CAUSE_REG,
533 IF_SPI_CIC_CMD_DOWNLOAD_OVER);
534out:
535 if (err)
536 pr_err("failed to load helper firmware (err=%d)\n", err);
537 lbs_deb_leave_args(LBS_DEB_SPI, "err %d", err);
538 return err;
539}
540
541/*
542 * Returns the length of the next packet the firmware expects us to send.
543 * Sets crc_err if the previous transfer had a CRC error.
544 */
545static int if_spi_prog_main_firmware_check_len(struct if_spi_card *card,
546 int *crc_err)
547{
548 u16 len;
549 int err = 0;
550
551 /*
552 * wait until the host interrupt status register indicates
553 * that we are ready to download
554 */
555 err = spu_wait_for_u16(card, IF_SPI_HOST_INT_STATUS_REG,
556 IF_SPI_HIST_CMD_DOWNLOAD_RDY,
557 IF_SPI_HIST_CMD_DOWNLOAD_RDY);
558 if (err) {
559 pr_err("timed out waiting for host_int_status\n");
560 return err;
561 }
562
563 /* Ask the device how many bytes of firmware it wants. */
564 err = spu_read_u16(card, IF_SPI_SCRATCH_1_REG, &len);
565 if (err)
566 return err;
567
568 if (len > IF_SPI_CMD_BUF_SIZE) {
569 pr_err("firmware load device requested a larger transfer than we are prepared to handle (len = %d)\n",
570 len);
571 return -EIO;
572 }
573 if (len & 0x1) {
574 lbs_deb_spi("%s: crc error\n", __func__);
575 len &= ~0x1;
576 *crc_err = 1;
577 } else
578 *crc_err = 0;
579
580 return len;
581}
582
583static int if_spi_prog_main_firmware(struct if_spi_card *card,
584 const struct firmware *firmware)
585{
586 struct lbs_private *priv = card->priv;
587 int len, prev_len;
588 int bytes, crc_err = 0, err = 0;
589 const u8 *fw;
590 u16 num_crc_errs;
591
592 lbs_deb_enter(LBS_DEB_SPI);
593
594 err = spu_set_interrupt_mode(card, 1, 0);
595 if (err)
596 goto out;
597
598 err = spu_wait_for_u16(card, IF_SPI_SCRATCH_1_REG, 0, 0);
599 if (err) {
600 netdev_err(priv->dev,
601 "%s: timed out waiting for initial scratch reg = 0\n",
602 __func__);
603 goto out;
604 }
605
606 num_crc_errs = 0;
607 prev_len = 0;
608 bytes = firmware->size;
609 fw = firmware->data;
610 while ((len = if_spi_prog_main_firmware_check_len(card, &crc_err))) {
611 if (len < 0) {
612 err = len;
613 goto out;
614 }
615 if (bytes < 0) {
616 /*
617 * If there are no more bytes left, we would normally
618 * expect to have terminated with len = 0
619 */
620 netdev_err(priv->dev,
621 "Firmware load wants more bytes than we have to offer.\n");
622 break;
623 }
624 if (crc_err) {
625 /* Previous transfer failed. */
626 if (++num_crc_errs > MAX_MAIN_FW_LOAD_CRC_ERR) {
627 pr_err("Too many CRC errors encountered in firmware load.\n");
628 err = -EIO;
629 goto out;
630 }
631 } else {
632 /* Previous transfer succeeded. Advance counters. */
633 bytes -= prev_len;
634 fw += prev_len;
635 }
636 if (bytes < len) {
637 memset(card->cmd_buffer, 0, len);
638 memcpy(card->cmd_buffer, fw, bytes);
639 } else
640 memcpy(card->cmd_buffer, fw, len);
641
642 err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_REG, 0);
643 if (err)
644 goto out;
645 err = spu_write(card, IF_SPI_CMD_RDWRPORT_REG,
646 card->cmd_buffer, len);
647 if (err)
648 goto out;
649 err = spu_write_u16(card, IF_SPI_CARD_INT_CAUSE_REG ,
650 IF_SPI_CIC_CMD_DOWNLOAD_OVER);
651 if (err)
652 goto out;
653 prev_len = len;
654 }
655 if (bytes > prev_len) {
656 pr_err("firmware load wants fewer bytes than we have to offer\n");
657 }
658
659 /* Confirm firmware download */
660 err = spu_wait_for_u32(card, IF_SPI_SCRATCH_4_REG,
661 SUCCESSFUL_FW_DOWNLOAD_MAGIC);
662 if (err) {
663 pr_err("failed to confirm the firmware download\n");
664 goto out;
665 }
666
667out:
668 if (err)
669 pr_err("failed to load firmware (err=%d)\n", err);
670 lbs_deb_leave_args(LBS_DEB_SPI, "err %d", err);
671 return err;
672}
673
674/*
675 * SPI Transfer Thread
676 *
677 * The SPI worker handles all SPI transfers, so there is no need for a lock.
678 */
679
680/* Move a command from the card to the host */
681static int if_spi_c2h_cmd(struct if_spi_card *card)
682{
683 struct lbs_private *priv = card->priv;
684 unsigned long flags;
685 int err = 0;
686 u16 len;
687 u8 i;
688
689 /*
690 * We need a buffer big enough to handle whatever people send to
691 * hw_host_to_card
692 */
693 BUILD_BUG_ON(IF_SPI_CMD_BUF_SIZE < LBS_CMD_BUFFER_SIZE);
694 BUILD_BUG_ON(IF_SPI_CMD_BUF_SIZE < LBS_UPLD_SIZE);
695
696 /*
697 * It's just annoying if the buffer size isn't a multiple of 4, because
698 * then we might have len < IF_SPI_CMD_BUF_SIZE but
699 * ALIGN(len, 4) > IF_SPI_CMD_BUF_SIZE
700 */
701 BUILD_BUG_ON(IF_SPI_CMD_BUF_SIZE % 4 != 0);
702
703 lbs_deb_enter(LBS_DEB_SPI);
704
705 /* How many bytes are there to read? */
706 err = spu_read_u16(card, IF_SPI_SCRATCH_2_REG, &len);
707 if (err)
708 goto out;
709 if (!len) {
710 netdev_err(priv->dev, "%s: error: card has no data for host\n",
711 __func__);
712 err = -EINVAL;
713 goto out;
714 } else if (len > IF_SPI_CMD_BUF_SIZE) {
715 netdev_err(priv->dev,
716 "%s: error: response packet too large: %d bytes, but maximum is %d\n",
717 __func__, len, IF_SPI_CMD_BUF_SIZE);
718 err = -EINVAL;
719 goto out;
720 }
721
722 /* Read the data from the WLAN module into our command buffer */
723 err = spu_read(card, IF_SPI_CMD_RDWRPORT_REG,
724 card->cmd_buffer, ALIGN(len, 4));
725 if (err)
726 goto out;
727
728 spin_lock_irqsave(&priv->driver_lock, flags);
729 i = (priv->resp_idx == 0) ? 1 : 0;
730 BUG_ON(priv->resp_len[i]);
731 priv->resp_len[i] = len;
732 memcpy(priv->resp_buf[i], card->cmd_buffer, len);
733 lbs_notify_command_response(priv, i);
734 spin_unlock_irqrestore(&priv->driver_lock, flags);
735
736out:
737 if (err)
738 netdev_err(priv->dev, "%s: err=%d\n", __func__, err);
739 lbs_deb_leave(LBS_DEB_SPI);
740 return err;
741}
742
743/* Move data from the card to the host */
744static int if_spi_c2h_data(struct if_spi_card *card)
745{
746 struct lbs_private *priv = card->priv;
747 struct sk_buff *skb;
748 char *data;
749 u16 len;
750 int err = 0;
751
752 lbs_deb_enter(LBS_DEB_SPI);
753
754 /* How many bytes are there to read? */
755 err = spu_read_u16(card, IF_SPI_SCRATCH_1_REG, &len);
756 if (err)
757 goto out;
758 if (!len) {
759 netdev_err(priv->dev, "%s: error: card has no data for host\n",
760 __func__);
761 err = -EINVAL;
762 goto out;
763 } else if (len > MRVDRV_ETH_RX_PACKET_BUFFER_SIZE) {
764 netdev_err(priv->dev,
765 "%s: error: card has %d bytes of data, but our maximum skb size is %zu\n",
766 __func__, len, MRVDRV_ETH_RX_PACKET_BUFFER_SIZE);
767 err = -EINVAL;
768 goto out;
769 }
770
771 /* TODO: should we allocate a smaller skb if we have less data? */
772 skb = dev_alloc_skb(MRVDRV_ETH_RX_PACKET_BUFFER_SIZE);
773 if (!skb) {
774 err = -ENOBUFS;
775 goto out;
776 }
777 skb_reserve(skb, IPFIELD_ALIGN_OFFSET);
778 data = skb_put(skb, len);
779
780 /* Read the data from the WLAN module into our skb... */
781 err = spu_read(card, IF_SPI_DATA_RDWRPORT_REG, data, ALIGN(len, 4));
782 if (err)
783 goto free_skb;
784
785 /* pass the SKB to libertas */
786 err = lbs_process_rxed_packet(card->priv, skb);
787 if (err)
788 goto free_skb;
789
790 /* success */
791 goto out;
792
793free_skb:
794 dev_kfree_skb(skb);
795out:
796 if (err)
797 netdev_err(priv->dev, "%s: err=%d\n", __func__, err);
798 lbs_deb_leave(LBS_DEB_SPI);
799 return err;
800}
801
802/* Move data or a command from the host to the card. */
803static void if_spi_h2c(struct if_spi_card *card,
804 struct if_spi_packet *packet, int type)
805{
806 struct lbs_private *priv = card->priv;
807 int err = 0;
808 u16 int_type, port_reg;
809
810 switch (type) {
811 case MVMS_DAT:
812 int_type = IF_SPI_CIC_TX_DOWNLOAD_OVER;
813 port_reg = IF_SPI_DATA_RDWRPORT_REG;
814 break;
815 case MVMS_CMD:
816 int_type = IF_SPI_CIC_CMD_DOWNLOAD_OVER;
817 port_reg = IF_SPI_CMD_RDWRPORT_REG;
818 break;
819 default:
820 netdev_err(priv->dev, "can't transfer buffer of type %d\n",
821 type);
822 err = -EINVAL;
823 goto out;
824 }
825
826 /* Write the data to the card */
827 err = spu_write(card, port_reg, packet->buffer, packet->blen);
828 if (err)
829 goto out;
830
831out:
832 kfree(packet);
833
834 if (err)
835 netdev_err(priv->dev, "%s: error %d\n", __func__, err);
836}
837
838/* Inform the host about a card event */
839static void if_spi_e2h(struct if_spi_card *card)
840{
841 int err = 0;
842 u32 cause;
843 struct lbs_private *priv = card->priv;
844
845 err = spu_read_u32(card, IF_SPI_SCRATCH_3_REG, &cause);
846 if (err)
847 goto out;
848
849 /* re-enable the card event interrupt */
850 spu_write_u16(card, IF_SPI_HOST_INT_STATUS_REG,
851 ~IF_SPI_HICU_CARD_EVENT);
852
853 /* generate a card interrupt */
854 spu_write_u16(card, IF_SPI_CARD_INT_CAUSE_REG, IF_SPI_CIC_HOST_EVENT);
855
856 lbs_queue_event(priv, cause & 0xff);
857out:
858 if (err)
859 netdev_err(priv->dev, "%s: error %d\n", __func__, err);
860}
861
862static void if_spi_host_to_card_worker(struct work_struct *work)
863{
864 int err;
865 struct if_spi_card *card;
866 u16 hiStatus;
867 unsigned long flags;
868 struct if_spi_packet *packet;
869 struct lbs_private *priv;
870
871 card = container_of(work, struct if_spi_card, packet_work);
872 priv = card->priv;
873
874 lbs_deb_enter(LBS_DEB_SPI);
875
876 /*
877 * Read the host interrupt status register to see what we
878 * can do.
879 */
880 err = spu_read_u16(card, IF_SPI_HOST_INT_STATUS_REG,
881 &hiStatus);
882 if (err) {
883 netdev_err(priv->dev, "I/O error\n");
884 goto err;
885 }
886
887 if (hiStatus & IF_SPI_HIST_CMD_UPLOAD_RDY) {
888 err = if_spi_c2h_cmd(card);
889 if (err)
890 goto err;
891 }
892 if (hiStatus & IF_SPI_HIST_RX_UPLOAD_RDY) {
893 err = if_spi_c2h_data(card);
894 if (err)
895 goto err;
896 }
897
898 /*
899 * workaround: in PS mode, the card does not set the Command
900 * Download Ready bit, but it sets TX Download Ready.
901 */
902 if (hiStatus & IF_SPI_HIST_CMD_DOWNLOAD_RDY ||
903 (card->priv->psstate != PS_STATE_FULL_POWER &&
904 (hiStatus & IF_SPI_HIST_TX_DOWNLOAD_RDY))) {
905 /*
906 * This means two things. First of all,
907 * if there was a previous command sent, the card has
908 * successfully received it.
909 * Secondly, it is now ready to download another
910 * command.
911 */
912 lbs_host_to_card_done(card->priv);
913
914 /* Do we have any command packets from the host to send? */
915 packet = NULL;
916 spin_lock_irqsave(&card->buffer_lock, flags);
917 if (!list_empty(&card->cmd_packet_list)) {
918 packet = (struct if_spi_packet *)(card->
919 cmd_packet_list.next);
920 list_del(&packet->list);
921 }
922 spin_unlock_irqrestore(&card->buffer_lock, flags);
923
924 if (packet)
925 if_spi_h2c(card, packet, MVMS_CMD);
926 }
927 if (hiStatus & IF_SPI_HIST_TX_DOWNLOAD_RDY) {
928 /* Do we have any data packets from the host to send? */
929 packet = NULL;
930 spin_lock_irqsave(&card->buffer_lock, flags);
931 if (!list_empty(&card->data_packet_list)) {
932 packet = (struct if_spi_packet *)(card->
933 data_packet_list.next);
934 list_del(&packet->list);
935 }
936 spin_unlock_irqrestore(&card->buffer_lock, flags);
937
938 if (packet)
939 if_spi_h2c(card, packet, MVMS_DAT);
940 }
941 if (hiStatus & IF_SPI_HIST_CARD_EVENT)
942 if_spi_e2h(card);
943
944err:
945 if (err)
946 netdev_err(priv->dev, "%s: got error %d\n", __func__, err);
947
948 lbs_deb_leave(LBS_DEB_SPI);
949}
950
951/*
952 * Host to Card
953 *
954 * Called from Libertas to transfer some data to the WLAN device
955 * We can't sleep here.
956 */
957static int if_spi_host_to_card(struct lbs_private *priv,
958 u8 type, u8 *buf, u16 nb)
959{
960 int err = 0;
961 unsigned long flags;
962 struct if_spi_card *card = priv->card;
963 struct if_spi_packet *packet;
964 u16 blen;
965
966 lbs_deb_enter_args(LBS_DEB_SPI, "type %d, bytes %d", type, nb);
967
968 if (nb == 0) {
969 netdev_err(priv->dev, "%s: invalid size requested: %d\n",
970 __func__, nb);
971 err = -EINVAL;
972 goto out;
973 }
974 blen = ALIGN(nb, 4);
975 packet = kzalloc(sizeof(struct if_spi_packet) + blen, GFP_ATOMIC);
976 if (!packet) {
977 err = -ENOMEM;
978 goto out;
979 }
980 packet->blen = blen;
981 memcpy(packet->buffer, buf, nb);
982 memset(packet->buffer + nb, 0, blen - nb);
983
984 switch (type) {
985 case MVMS_CMD:
986 priv->dnld_sent = DNLD_CMD_SENT;
987 spin_lock_irqsave(&card->buffer_lock, flags);
988 list_add_tail(&packet->list, &card->cmd_packet_list);
989 spin_unlock_irqrestore(&card->buffer_lock, flags);
990 break;
991 case MVMS_DAT:
992 priv->dnld_sent = DNLD_DATA_SENT;
993 spin_lock_irqsave(&card->buffer_lock, flags);
994 list_add_tail(&packet->list, &card->data_packet_list);
995 spin_unlock_irqrestore(&card->buffer_lock, flags);
996 break;
997 default:
998 kfree(packet);
999 netdev_err(priv->dev, "can't transfer buffer of type %d\n",
1000 type);
1001 err = -EINVAL;
1002 break;
1003 }
1004
1005 /* Queue spi xfer work */
1006 queue_work(card->workqueue, &card->packet_work);
1007out:
1008 lbs_deb_leave_args(LBS_DEB_SPI, "err=%d", err);
1009 return err;
1010}
1011
1012/*
1013 * Host Interrupts
1014 *
1015 * Service incoming interrupts from the WLAN device. We can't sleep here, so
1016 * don't try to talk on the SPI bus, just queue the SPI xfer work.
1017 */
1018static irqreturn_t if_spi_host_interrupt(int irq, void *dev_id)
1019{
1020 struct if_spi_card *card = dev_id;
1021
1022 queue_work(card->workqueue, &card->packet_work);
1023
1024 return IRQ_HANDLED;
1025}
1026
1027/*
1028 * SPI callbacks
1029 */
1030
1031static int if_spi_init_card(struct if_spi_card *card)
1032{
1033 struct lbs_private *priv = card->priv;
1034 int err, i;
1035 u32 scratch;
1036 const struct firmware *helper = NULL;
1037 const struct firmware *mainfw = NULL;
1038
1039 lbs_deb_enter(LBS_DEB_SPI);
1040
1041 err = spu_init(card, card->pdata->use_dummy_writes);
1042 if (err)
1043 goto out;
1044 err = spu_get_chip_revision(card, &card->card_id, &card->card_rev);
1045 if (err)
1046 goto out;
1047
1048 err = spu_read_u32(card, IF_SPI_SCRATCH_4_REG, &scratch);
1049 if (err)
1050 goto out;
1051 if (scratch == SUCCESSFUL_FW_DOWNLOAD_MAGIC)
1052 lbs_deb_spi("Firmware is already loaded for "
1053 "Marvell WLAN 802.11 adapter\n");
1054 else {
1055 /* Check if we support this card */
1056 for (i = 0; i < ARRAY_SIZE(fw_table); i++) {
1057 if (card->card_id == fw_table[i].model)
1058 break;
1059 }
1060 if (i == ARRAY_SIZE(fw_table)) {
1061 netdev_err(priv->dev, "Unsupported chip_id: 0x%02x\n",
1062 card->card_id);
1063 err = -ENODEV;
1064 goto out;
1065 }
1066
1067 err = lbs_get_firmware(&card->spi->dev, card->card_id,
1068 &fw_table[0], &helper, &mainfw);
1069 if (err) {
1070 netdev_err(priv->dev, "failed to find firmware (%d)\n",
1071 err);
1072 goto out;
1073 }
1074
1075 lbs_deb_spi("Initializing FW for Marvell WLAN 802.11 adapter "
1076 "(chip_id = 0x%04x, chip_rev = 0x%02x) "
1077 "attached to SPI bus_num %d, chip_select %d. "
1078 "spi->max_speed_hz=%d\n",
1079 card->card_id, card->card_rev,
1080 card->spi->master->bus_num,
1081 card->spi->chip_select,
1082 card->spi->max_speed_hz);
1083 err = if_spi_prog_helper_firmware(card, helper);
1084 if (err)
1085 goto out;
1086 err = if_spi_prog_main_firmware(card, mainfw);
1087 if (err)
1088 goto out;
1089 lbs_deb_spi("loaded FW for Marvell WLAN 802.11 adapter\n");
1090 }
1091
1092 err = spu_set_interrupt_mode(card, 0, 1);
1093 if (err)
1094 goto out;
1095
1096out:
1097 release_firmware(helper);
1098 release_firmware(mainfw);
1099
1100 lbs_deb_leave_args(LBS_DEB_SPI, "err %d\n", err);
1101
1102 return err;
1103}
1104
1105static void if_spi_resume_worker(struct work_struct *work)
1106{
1107 struct if_spi_card *card;
1108
1109 card = container_of(work, struct if_spi_card, resume_work);
1110
1111 if (card->suspended) {
1112 if (card->pdata->setup)
1113 card->pdata->setup(card->spi);
1114
1115 /* Init card ... */
1116 if_spi_init_card(card);
1117
1118 enable_irq(card->spi->irq);
1119
1120 /* And resume it ... */
1121 lbs_resume(card->priv);
1122
1123 card->suspended = 0;
1124 }
1125}
1126
1127static int __devinit if_spi_probe(struct spi_device *spi)
1128{
1129 struct if_spi_card *card;
1130 struct lbs_private *priv = NULL;
1131 struct libertas_spi_platform_data *pdata = spi->dev.platform_data;
1132 int err = 0;
1133
1134 lbs_deb_enter(LBS_DEB_SPI);
1135
1136 if (!pdata) {
1137 err = -EINVAL;
1138 goto out;
1139 }
1140
1141 if (pdata->setup) {
1142 err = pdata->setup(spi);
1143 if (err)
1144 goto out;
1145 }
1146
1147 /* Allocate card structure to represent this specific device */
1148 card = kzalloc(sizeof(struct if_spi_card), GFP_KERNEL);
1149 if (!card) {
1150 err = -ENOMEM;
1151 goto teardown;
1152 }
1153 spi_set_drvdata(spi, card);
1154 card->pdata = pdata;
1155 card->spi = spi;
1156 card->prev_xfer_time = jiffies;
1157
1158 INIT_LIST_HEAD(&card->cmd_packet_list);
1159 INIT_LIST_HEAD(&card->data_packet_list);
1160 spin_lock_init(&card->buffer_lock);
1161
1162 /* Initialize the SPI Interface Unit */
1163
1164 /* Firmware load */
1165 err = if_spi_init_card(card);
1166 if (err)
1167 goto free_card;
1168
1169 /*
1170 * Register our card with libertas.
1171 * This will call alloc_etherdev.
1172 */
1173 priv = lbs_add_card(card, &spi->dev);
1174 if (!priv) {
1175 err = -ENOMEM;
1176 goto free_card;
1177 }
1178 card->priv = priv;
1179 priv->setup_fw_on_resume = 1;
1180 priv->card = card;
1181 priv->hw_host_to_card = if_spi_host_to_card;
1182 priv->enter_deep_sleep = NULL;
1183 priv->exit_deep_sleep = NULL;
1184 priv->reset_deep_sleep_wakeup = NULL;
1185 priv->fw_ready = 1;
1186
1187 /* Initialize interrupt handling stuff. */
1188 card->workqueue = create_workqueue("libertas_spi");
1189 INIT_WORK(&card->packet_work, if_spi_host_to_card_worker);
1190 INIT_WORK(&card->resume_work, if_spi_resume_worker);
1191
1192 err = request_irq(spi->irq, if_spi_host_interrupt,
1193 IRQF_TRIGGER_FALLING, "libertas_spi", card);
1194 if (err) {
1195 pr_err("can't get host irq line-- request_irq failed\n");
1196 goto terminate_workqueue;
1197 }
1198
1199 /*
1200 * Start the card.
1201 * This will call register_netdev, and we'll start
1202 * getting interrupts...
1203 */
1204 err = lbs_start_card(priv);
1205 if (err)
1206 goto release_irq;
1207
1208 lbs_deb_spi("Finished initializing WLAN module.\n");
1209
1210 /* successful exit */
1211 goto out;
1212
1213release_irq:
1214 free_irq(spi->irq, card);
1215terminate_workqueue:
1216 flush_workqueue(card->workqueue);
1217 destroy_workqueue(card->workqueue);
1218 lbs_remove_card(priv); /* will call free_netdev */
1219free_card:
1220 free_if_spi_card(card);
1221teardown:
1222 if (pdata->teardown)
1223 pdata->teardown(spi);
1224out:
1225 lbs_deb_leave_args(LBS_DEB_SPI, "err %d\n", err);
1226 return err;
1227}
1228
1229static int __devexit libertas_spi_remove(struct spi_device *spi)
1230{
1231 struct if_spi_card *card = spi_get_drvdata(spi);
1232 struct lbs_private *priv = card->priv;
1233
1234 lbs_deb_spi("libertas_spi_remove\n");
1235 lbs_deb_enter(LBS_DEB_SPI);
1236
1237 cancel_work_sync(&card->resume_work);
1238
1239 lbs_stop_card(priv);
1240 lbs_remove_card(priv); /* will call free_netdev */
1241
1242 free_irq(spi->irq, card);
1243 flush_workqueue(card->workqueue);
1244 destroy_workqueue(card->workqueue);
1245 if (card->pdata->teardown)
1246 card->pdata->teardown(spi);
1247 free_if_spi_card(card);
1248 lbs_deb_leave(LBS_DEB_SPI);
1249 return 0;
1250}
1251
1252static int if_spi_suspend(struct device *dev)
1253{
1254 struct spi_device *spi = to_spi_device(dev);
1255 struct if_spi_card *card = spi_get_drvdata(spi);
1256
1257 if (!card->suspended) {
1258 lbs_suspend(card->priv);
1259 flush_workqueue(card->workqueue);
1260 disable_irq(spi->irq);
1261
1262 if (card->pdata->teardown)
1263 card->pdata->teardown(spi);
1264 card->suspended = 1;
1265 }
1266
1267 return 0;
1268}
1269
1270static int if_spi_resume(struct device *dev)
1271{
1272 struct spi_device *spi = to_spi_device(dev);
1273 struct if_spi_card *card = spi_get_drvdata(spi);
1274
1275 /* Schedule delayed work */
1276 schedule_work(&card->resume_work);
1277
1278 return 0;
1279}
1280
1281static const struct dev_pm_ops if_spi_pm_ops = {
1282 .suspend = if_spi_suspend,
1283 .resume = if_spi_resume,
1284};
1285
1286static struct spi_driver libertas_spi_driver = {
1287 .probe = if_spi_probe,
1288 .remove = __devexit_p(libertas_spi_remove),
1289 .driver = {
1290 .name = "libertas_spi",
1291 .owner = THIS_MODULE,
1292 .pm = &if_spi_pm_ops,
1293 },
1294};
1295
1296/*
1297 * Module functions
1298 */
1299
1300static int __init if_spi_init_module(void)
1301{
1302 int ret = 0;
1303 lbs_deb_enter(LBS_DEB_SPI);
1304 printk(KERN_INFO "libertas_spi: Libertas SPI driver\n");
1305 ret = spi_register_driver(&libertas_spi_driver);
1306 lbs_deb_leave(LBS_DEB_SPI);
1307 return ret;
1308}
1309
1310static void __exit if_spi_exit_module(void)
1311{
1312 lbs_deb_enter(LBS_DEB_SPI);
1313 spi_unregister_driver(&libertas_spi_driver);
1314 lbs_deb_leave(LBS_DEB_SPI);
1315}
1316
1317module_init(if_spi_init_module);
1318module_exit(if_spi_exit_module);
1319
1320MODULE_DESCRIPTION("Libertas SPI WLAN Driver");
1321MODULE_AUTHOR("Andrey Yurovsky <andrey@cozybit.com>, "
1322 "Colin McCabe <colin@cozybit.com>");
1323MODULE_LICENSE("GPL");
1324MODULE_ALIAS("spi:libertas_spi");