xref: /openbmc/linux/drivers/net/can/janz-ican3.c (revision 4800cd83)
1 /*
2  * Janz MODULbus VMOD-ICAN3 CAN Interface Driver
3  *
4  * Copyright (c) 2010 Ira W. Snyder <iws@ovro.caltech.edu>
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms of the GNU General Public License as published by the
8  * Free Software Foundation; either version 2 of the License, or (at your
9  * option) any later version.
10  */
11 
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/interrupt.h>
16 #include <linux/delay.h>
17 #include <linux/platform_device.h>
18 
19 #include <linux/netdevice.h>
20 #include <linux/can.h>
21 #include <linux/can/dev.h>
22 #include <linux/can/error.h>
23 
24 #include <linux/mfd/janz.h>
25 
26 /* the DPM has 64k of memory, organized into 256x 256 byte pages */
27 #define DPM_NUM_PAGES		256
28 #define DPM_PAGE_SIZE		256
29 #define DPM_PAGE_ADDR(p)	((p) * DPM_PAGE_SIZE)
30 
31 /* JANZ ICAN3 "old-style" host interface queue page numbers */
32 #define QUEUE_OLD_CONTROL	0
33 #define QUEUE_OLD_RB0		1
34 #define QUEUE_OLD_RB1		2
35 #define QUEUE_OLD_WB0		3
36 #define QUEUE_OLD_WB1		4
37 
38 /* Janz ICAN3 "old-style" host interface control registers */
39 #define MSYNC_PEER		0x00		/* ICAN only */
40 #define MSYNC_LOCL		0x01		/* host only */
41 #define TARGET_RUNNING		0x02
42 
43 #define MSYNC_RB0		0x01
44 #define MSYNC_RB1		0x02
45 #define MSYNC_RBLW		0x04
46 #define MSYNC_RB_MASK		(MSYNC_RB0 | MSYNC_RB1)
47 
48 #define MSYNC_WB0		0x10
49 #define MSYNC_WB1		0x20
50 #define MSYNC_WBLW		0x40
51 #define MSYNC_WB_MASK		(MSYNC_WB0 | MSYNC_WB1)
52 
53 /* Janz ICAN3 "new-style" host interface queue page numbers */
54 #define QUEUE_TOHOST		5
55 #define QUEUE_FROMHOST_MID	6
56 #define QUEUE_FROMHOST_HIGH	7
57 #define QUEUE_FROMHOST_LOW	8
58 
59 /* The first free page in the DPM is #9 */
60 #define DPM_FREE_START		9
61 
62 /* Janz ICAN3 "new-style" and "fast" host interface descriptor flags */
63 #define DESC_VALID		0x80
64 #define DESC_WRAP		0x40
65 #define DESC_INTERRUPT		0x20
66 #define DESC_IVALID		0x10
67 #define DESC_LEN(len)		(len)
68 
69 /* Janz ICAN3 Firmware Messages */
70 #define MSG_CONNECTI		0x02
71 #define MSG_DISCONNECT		0x03
72 #define MSG_IDVERS		0x04
73 #define MSG_MSGLOST		0x05
74 #define MSG_NEWHOSTIF		0x08
75 #define MSG_INQUIRY		0x0a
76 #define MSG_SETAFILMASK		0x10
77 #define MSG_INITFDPMQUEUE	0x11
78 #define MSG_HWCONF		0x12
79 #define MSG_FMSGLOST		0x15
80 #define MSG_CEVTIND		0x37
81 #define MSG_CBTRREQ		0x41
82 #define MSG_COFFREQ		0x42
83 #define MSG_CONREQ		0x43
84 #define MSG_CCONFREQ		0x47
85 
86 /*
87  * Janz ICAN3 CAN Inquiry Message Types
88  *
89  * NOTE: there appears to be a firmware bug here. You must send
90  * NOTE: INQUIRY_STATUS and expect to receive an INQUIRY_EXTENDED
91  * NOTE: response. The controller never responds to a message with
92  * NOTE: the INQUIRY_EXTENDED subspec :(
93  */
94 #define INQUIRY_STATUS		0x00
95 #define INQUIRY_TERMINATION	0x01
96 #define INQUIRY_EXTENDED	0x04
97 
98 /* Janz ICAN3 CAN Set Acceptance Filter Mask Message Types */
99 #define SETAFILMASK_REJECT	0x00
100 #define SETAFILMASK_FASTIF	0x02
101 
102 /* Janz ICAN3 CAN Hardware Configuration Message Types */
103 #define HWCONF_TERMINATE_ON	0x01
104 #define HWCONF_TERMINATE_OFF	0x00
105 
106 /* Janz ICAN3 CAN Event Indication Message Types */
107 #define CEVTIND_EI		0x01
108 #define CEVTIND_DOI		0x02
109 #define CEVTIND_LOST		0x04
110 #define CEVTIND_FULL		0x08
111 #define CEVTIND_BEI		0x10
112 
113 #define CEVTIND_CHIP_SJA1000	0x02
114 
115 #define ICAN3_BUSERR_QUOTA_MAX	255
116 
117 /* Janz ICAN3 CAN Frame Conversion */
118 #define ICAN3_ECHO	0x10
119 #define ICAN3_EFF_RTR	0x40
120 #define ICAN3_SFF_RTR	0x10
121 #define ICAN3_EFF	0x80
122 
123 #define ICAN3_CAN_TYPE_MASK	0x0f
124 #define ICAN3_CAN_TYPE_SFF	0x00
125 #define ICAN3_CAN_TYPE_EFF	0x01
126 
127 #define ICAN3_CAN_DLC_MASK	0x0f
128 
129 /*
130  * SJA1000 Status and Error Register Definitions
131  *
132  * Copied from drivers/net/can/sja1000/sja1000.h
133  */
134 
135 /* status register content */
136 #define SR_BS		0x80
137 #define SR_ES		0x40
138 #define SR_TS		0x20
139 #define SR_RS		0x10
140 #define SR_TCS		0x08
141 #define SR_TBS		0x04
142 #define SR_DOS		0x02
143 #define SR_RBS		0x01
144 
145 #define SR_CRIT (SR_BS|SR_ES)
146 
147 /* ECC register */
148 #define ECC_SEG		0x1F
149 #define ECC_DIR		0x20
150 #define ECC_ERR		6
151 #define ECC_BIT		0x00
152 #define ECC_FORM	0x40
153 #define ECC_STUFF	0x80
154 #define ECC_MASK	0xc0
155 
156 /* Number of buffers for use in the "new-style" host interface */
157 #define ICAN3_NEW_BUFFERS	16
158 
159 /* Number of buffers for use in the "fast" host interface */
160 #define ICAN3_TX_BUFFERS	512
161 #define ICAN3_RX_BUFFERS	1024
162 
163 /* SJA1000 Clock Input */
164 #define ICAN3_CAN_CLOCK		8000000
165 
166 /* Driver Name */
167 #define DRV_NAME "janz-ican3"
168 
169 /* DPM Control Registers -- starts at offset 0x100 in the MODULbus registers */
170 struct ican3_dpm_control {
171 	/* window address register */
172 	u8 window_address;
173 	u8 unused1;
174 
175 	/*
176 	 * Read access: clear interrupt from microcontroller
177 	 * Write access: send interrupt to microcontroller
178 	 */
179 	u8 interrupt;
180 	u8 unused2;
181 
182 	/* write-only: reset all hardware on the module */
183 	u8 hwreset;
184 	u8 unused3;
185 
186 	/* write-only: generate an interrupt to the TPU */
187 	u8 tpuinterrupt;
188 };
189 
190 struct ican3_dev {
191 
192 	/* must be the first member */
193 	struct can_priv can;
194 
195 	/* CAN network device */
196 	struct net_device *ndev;
197 	struct napi_struct napi;
198 
199 	/* Device for printing */
200 	struct device *dev;
201 
202 	/* module number */
203 	unsigned int num;
204 
205 	/* base address of registers and IRQ */
206 	struct janz_cmodio_onboard_regs __iomem *ctrl;
207 	struct ican3_dpm_control __iomem *dpmctrl;
208 	void __iomem *dpm;
209 	int irq;
210 
211 	/* CAN bus termination status */
212 	struct completion termination_comp;
213 	bool termination_enabled;
214 
215 	/* CAN bus error status registers */
216 	struct completion buserror_comp;
217 	struct can_berr_counter bec;
218 
219 	/* old and new style host interface */
220 	unsigned int iftype;
221 
222 	/*
223 	 * Any function which changes the current DPM page must hold this
224 	 * lock while it is performing data accesses. This ensures that the
225 	 * function will not be preempted and end up reading data from a
226 	 * different DPM page than it expects.
227 	 */
228 	spinlock_t lock;
229 
230 	/* new host interface */
231 	unsigned int rx_int;
232 	unsigned int rx_num;
233 	unsigned int tx_num;
234 
235 	/* fast host interface */
236 	unsigned int fastrx_start;
237 	unsigned int fastrx_int;
238 	unsigned int fastrx_num;
239 	unsigned int fasttx_start;
240 	unsigned int fasttx_num;
241 
242 	/* first free DPM page */
243 	unsigned int free_page;
244 };
245 
246 struct ican3_msg {
247 	u8 control;
248 	u8 spec;
249 	__le16 len;
250 	u8 data[252];
251 };
252 
253 struct ican3_new_desc {
254 	u8 control;
255 	u8 pointer;
256 };
257 
258 struct ican3_fast_desc {
259 	u8 control;
260 	u8 command;
261 	u8 data[14];
262 };
263 
264 /* write to the window basic address register */
265 static inline void ican3_set_page(struct ican3_dev *mod, unsigned int page)
266 {
267 	BUG_ON(page >= DPM_NUM_PAGES);
268 	iowrite8(page, &mod->dpmctrl->window_address);
269 }
270 
271 /*
272  * ICAN3 "old-style" host interface
273  */
274 
275 /*
276  * Recieve a message from the ICAN3 "old-style" firmware interface
277  *
278  * LOCKING: must hold mod->lock
279  *
280  * returns 0 on success, -ENOMEM when no message exists
281  */
282 static int ican3_old_recv_msg(struct ican3_dev *mod, struct ican3_msg *msg)
283 {
284 	unsigned int mbox, mbox_page;
285 	u8 locl, peer, xord;
286 
287 	/* get the MSYNC registers */
288 	ican3_set_page(mod, QUEUE_OLD_CONTROL);
289 	peer = ioread8(mod->dpm + MSYNC_PEER);
290 	locl = ioread8(mod->dpm + MSYNC_LOCL);
291 	xord = locl ^ peer;
292 
293 	if ((xord & MSYNC_RB_MASK) == 0x00) {
294 		dev_dbg(mod->dev, "no mbox for reading\n");
295 		return -ENOMEM;
296 	}
297 
298 	/* find the first free mbox to read */
299 	if ((xord & MSYNC_RB_MASK) == MSYNC_RB_MASK)
300 		mbox = (xord & MSYNC_RBLW) ? MSYNC_RB0 : MSYNC_RB1;
301 	else
302 		mbox = (xord & MSYNC_RB0) ? MSYNC_RB0 : MSYNC_RB1;
303 
304 	/* copy the message */
305 	mbox_page = (mbox == MSYNC_RB0) ? QUEUE_OLD_RB0 : QUEUE_OLD_RB1;
306 	ican3_set_page(mod, mbox_page);
307 	memcpy_fromio(msg, mod->dpm, sizeof(*msg));
308 
309 	/*
310 	 * notify the firmware that the read buffer is available
311 	 * for it to fill again
312 	 */
313 	locl ^= mbox;
314 
315 	ican3_set_page(mod, QUEUE_OLD_CONTROL);
316 	iowrite8(locl, mod->dpm + MSYNC_LOCL);
317 	return 0;
318 }
319 
320 /*
321  * Send a message through the "old-style" firmware interface
322  *
323  * LOCKING: must hold mod->lock
324  *
325  * returns 0 on success, -ENOMEM when no free space exists
326  */
327 static int ican3_old_send_msg(struct ican3_dev *mod, struct ican3_msg *msg)
328 {
329 	unsigned int mbox, mbox_page;
330 	u8 locl, peer, xord;
331 
332 	/* get the MSYNC registers */
333 	ican3_set_page(mod, QUEUE_OLD_CONTROL);
334 	peer = ioread8(mod->dpm + MSYNC_PEER);
335 	locl = ioread8(mod->dpm + MSYNC_LOCL);
336 	xord = locl ^ peer;
337 
338 	if ((xord & MSYNC_WB_MASK) == MSYNC_WB_MASK) {
339 		dev_err(mod->dev, "no mbox for writing\n");
340 		return -ENOMEM;
341 	}
342 
343 	/* calculate a free mbox to use */
344 	mbox = (xord & MSYNC_WB0) ? MSYNC_WB1 : MSYNC_WB0;
345 
346 	/* copy the message to the DPM */
347 	mbox_page = (mbox == MSYNC_WB0) ? QUEUE_OLD_WB0 : QUEUE_OLD_WB1;
348 	ican3_set_page(mod, mbox_page);
349 	memcpy_toio(mod->dpm, msg, sizeof(*msg));
350 
351 	locl ^= mbox;
352 	if (mbox == MSYNC_WB1)
353 		locl |= MSYNC_WBLW;
354 
355 	ican3_set_page(mod, QUEUE_OLD_CONTROL);
356 	iowrite8(locl, mod->dpm + MSYNC_LOCL);
357 	return 0;
358 }
359 
360 /*
361  * ICAN3 "new-style" Host Interface Setup
362  */
363 
364 static void __devinit ican3_init_new_host_interface(struct ican3_dev *mod)
365 {
366 	struct ican3_new_desc desc;
367 	unsigned long flags;
368 	void __iomem *dst;
369 	int i;
370 
371 	spin_lock_irqsave(&mod->lock, flags);
372 
373 	/* setup the internal datastructures for RX */
374 	mod->rx_num = 0;
375 	mod->rx_int = 0;
376 
377 	/* tohost queue descriptors are in page 5 */
378 	ican3_set_page(mod, QUEUE_TOHOST);
379 	dst = mod->dpm;
380 
381 	/* initialize the tohost (rx) queue descriptors: pages 9-24 */
382 	for (i = 0; i < ICAN3_NEW_BUFFERS; i++) {
383 		desc.control = DESC_INTERRUPT | DESC_LEN(1); /* I L=1 */
384 		desc.pointer = mod->free_page;
385 
386 		/* set wrap flag on last buffer */
387 		if (i == ICAN3_NEW_BUFFERS - 1)
388 			desc.control |= DESC_WRAP;
389 
390 		memcpy_toio(dst, &desc, sizeof(desc));
391 		dst += sizeof(desc);
392 		mod->free_page++;
393 	}
394 
395 	/* fromhost (tx) mid queue descriptors are in page 6 */
396 	ican3_set_page(mod, QUEUE_FROMHOST_MID);
397 	dst = mod->dpm;
398 
399 	/* setup the internal datastructures for TX */
400 	mod->tx_num = 0;
401 
402 	/* initialize the fromhost mid queue descriptors: pages 25-40 */
403 	for (i = 0; i < ICAN3_NEW_BUFFERS; i++) {
404 		desc.control = DESC_VALID | DESC_LEN(1); /* V L=1 */
405 		desc.pointer = mod->free_page;
406 
407 		/* set wrap flag on last buffer */
408 		if (i == ICAN3_NEW_BUFFERS - 1)
409 			desc.control |= DESC_WRAP;
410 
411 		memcpy_toio(dst, &desc, sizeof(desc));
412 		dst += sizeof(desc);
413 		mod->free_page++;
414 	}
415 
416 	/* fromhost hi queue descriptors are in page 7 */
417 	ican3_set_page(mod, QUEUE_FROMHOST_HIGH);
418 	dst = mod->dpm;
419 
420 	/* initialize only a single buffer in the fromhost hi queue (unused) */
421 	desc.control = DESC_VALID | DESC_WRAP | DESC_LEN(1); /* VW L=1 */
422 	desc.pointer = mod->free_page;
423 	memcpy_toio(dst, &desc, sizeof(desc));
424 	mod->free_page++;
425 
426 	/* fromhost low queue descriptors are in page 8 */
427 	ican3_set_page(mod, QUEUE_FROMHOST_LOW);
428 	dst = mod->dpm;
429 
430 	/* initialize only a single buffer in the fromhost low queue (unused) */
431 	desc.control = DESC_VALID | DESC_WRAP | DESC_LEN(1); /* VW L=1 */
432 	desc.pointer = mod->free_page;
433 	memcpy_toio(dst, &desc, sizeof(desc));
434 	mod->free_page++;
435 
436 	spin_unlock_irqrestore(&mod->lock, flags);
437 }
438 
439 /*
440  * ICAN3 Fast Host Interface Setup
441  */
442 
443 static void __devinit ican3_init_fast_host_interface(struct ican3_dev *mod)
444 {
445 	struct ican3_fast_desc desc;
446 	unsigned long flags;
447 	unsigned int addr;
448 	void __iomem *dst;
449 	int i;
450 
451 	spin_lock_irqsave(&mod->lock, flags);
452 
453 	/* save the start recv page */
454 	mod->fastrx_start = mod->free_page;
455 	mod->fastrx_num = 0;
456 	mod->fastrx_int = 0;
457 
458 	/* build a single fast tohost queue descriptor */
459 	memset(&desc, 0, sizeof(desc));
460 	desc.control = 0x00;
461 	desc.command = 1;
462 
463 	/* build the tohost queue descriptor ring in memory */
464 	addr = 0;
465 	for (i = 0; i < ICAN3_RX_BUFFERS; i++) {
466 
467 		/* set the wrap bit on the last buffer */
468 		if (i == ICAN3_RX_BUFFERS - 1)
469 			desc.control |= DESC_WRAP;
470 
471 		/* switch to the correct page */
472 		ican3_set_page(mod, mod->free_page);
473 
474 		/* copy the descriptor to the DPM */
475 		dst = mod->dpm + addr;
476 		memcpy_toio(dst, &desc, sizeof(desc));
477 		addr += sizeof(desc);
478 
479 		/* move to the next page if necessary */
480 		if (addr >= DPM_PAGE_SIZE) {
481 			addr = 0;
482 			mod->free_page++;
483 		}
484 	}
485 
486 	/* make sure we page-align the next queue */
487 	if (addr != 0)
488 		mod->free_page++;
489 
490 	/* save the start xmit page */
491 	mod->fasttx_start = mod->free_page;
492 	mod->fasttx_num = 0;
493 
494 	/* build a single fast fromhost queue descriptor */
495 	memset(&desc, 0, sizeof(desc));
496 	desc.control = DESC_VALID;
497 	desc.command = 1;
498 
499 	/* build the fromhost queue descriptor ring in memory */
500 	addr = 0;
501 	for (i = 0; i < ICAN3_TX_BUFFERS; i++) {
502 
503 		/* set the wrap bit on the last buffer */
504 		if (i == ICAN3_TX_BUFFERS - 1)
505 			desc.control |= DESC_WRAP;
506 
507 		/* switch to the correct page */
508 		ican3_set_page(mod, mod->free_page);
509 
510 		/* copy the descriptor to the DPM */
511 		dst = mod->dpm + addr;
512 		memcpy_toio(dst, &desc, sizeof(desc));
513 		addr += sizeof(desc);
514 
515 		/* move to the next page if necessary */
516 		if (addr >= DPM_PAGE_SIZE) {
517 			addr = 0;
518 			mod->free_page++;
519 		}
520 	}
521 
522 	spin_unlock_irqrestore(&mod->lock, flags);
523 }
524 
525 /*
526  * ICAN3 "new-style" Host Interface Message Helpers
527  */
528 
529 /*
530  * LOCKING: must hold mod->lock
531  */
532 static int ican3_new_send_msg(struct ican3_dev *mod, struct ican3_msg *msg)
533 {
534 	struct ican3_new_desc desc;
535 	void __iomem *desc_addr = mod->dpm + (mod->tx_num * sizeof(desc));
536 
537 	/* switch to the fromhost mid queue, and read the buffer descriptor */
538 	ican3_set_page(mod, QUEUE_FROMHOST_MID);
539 	memcpy_fromio(&desc, desc_addr, sizeof(desc));
540 
541 	if (!(desc.control & DESC_VALID)) {
542 		dev_dbg(mod->dev, "%s: no free buffers\n", __func__);
543 		return -ENOMEM;
544 	}
545 
546 	/* switch to the data page, copy the data */
547 	ican3_set_page(mod, desc.pointer);
548 	memcpy_toio(mod->dpm, msg, sizeof(*msg));
549 
550 	/* switch back to the descriptor, set the valid bit, write it back */
551 	ican3_set_page(mod, QUEUE_FROMHOST_MID);
552 	desc.control ^= DESC_VALID;
553 	memcpy_toio(desc_addr, &desc, sizeof(desc));
554 
555 	/* update the tx number */
556 	mod->tx_num = (desc.control & DESC_WRAP) ? 0 : (mod->tx_num + 1);
557 	return 0;
558 }
559 
560 /*
561  * LOCKING: must hold mod->lock
562  */
563 static int ican3_new_recv_msg(struct ican3_dev *mod, struct ican3_msg *msg)
564 {
565 	struct ican3_new_desc desc;
566 	void __iomem *desc_addr = mod->dpm + (mod->rx_num * sizeof(desc));
567 
568 	/* switch to the tohost queue, and read the buffer descriptor */
569 	ican3_set_page(mod, QUEUE_TOHOST);
570 	memcpy_fromio(&desc, desc_addr, sizeof(desc));
571 
572 	if (!(desc.control & DESC_VALID)) {
573 		dev_dbg(mod->dev, "%s: no buffers to recv\n", __func__);
574 		return -ENOMEM;
575 	}
576 
577 	/* switch to the data page, copy the data */
578 	ican3_set_page(mod, desc.pointer);
579 	memcpy_fromio(msg, mod->dpm, sizeof(*msg));
580 
581 	/* switch back to the descriptor, toggle the valid bit, write it back */
582 	ican3_set_page(mod, QUEUE_TOHOST);
583 	desc.control ^= DESC_VALID;
584 	memcpy_toio(desc_addr, &desc, sizeof(desc));
585 
586 	/* update the rx number */
587 	mod->rx_num = (desc.control & DESC_WRAP) ? 0 : (mod->rx_num + 1);
588 	return 0;
589 }
590 
591 /*
592  * Message Send / Recv Helpers
593  */
594 
595 static int ican3_send_msg(struct ican3_dev *mod, struct ican3_msg *msg)
596 {
597 	unsigned long flags;
598 	int ret;
599 
600 	spin_lock_irqsave(&mod->lock, flags);
601 
602 	if (mod->iftype == 0)
603 		ret = ican3_old_send_msg(mod, msg);
604 	else
605 		ret = ican3_new_send_msg(mod, msg);
606 
607 	spin_unlock_irqrestore(&mod->lock, flags);
608 	return ret;
609 }
610 
611 static int ican3_recv_msg(struct ican3_dev *mod, struct ican3_msg *msg)
612 {
613 	unsigned long flags;
614 	int ret;
615 
616 	spin_lock_irqsave(&mod->lock, flags);
617 
618 	if (mod->iftype == 0)
619 		ret = ican3_old_recv_msg(mod, msg);
620 	else
621 		ret = ican3_new_recv_msg(mod, msg);
622 
623 	spin_unlock_irqrestore(&mod->lock, flags);
624 	return ret;
625 }
626 
627 /*
628  * Quick Pre-constructed Messages
629  */
630 
631 static int __devinit ican3_msg_connect(struct ican3_dev *mod)
632 {
633 	struct ican3_msg msg;
634 
635 	memset(&msg, 0, sizeof(msg));
636 	msg.spec = MSG_CONNECTI;
637 	msg.len = cpu_to_le16(0);
638 
639 	return ican3_send_msg(mod, &msg);
640 }
641 
642 static int __devexit ican3_msg_disconnect(struct ican3_dev *mod)
643 {
644 	struct ican3_msg msg;
645 
646 	memset(&msg, 0, sizeof(msg));
647 	msg.spec = MSG_DISCONNECT;
648 	msg.len = cpu_to_le16(0);
649 
650 	return ican3_send_msg(mod, &msg);
651 }
652 
653 static int __devinit ican3_msg_newhostif(struct ican3_dev *mod)
654 {
655 	struct ican3_msg msg;
656 	int ret;
657 
658 	memset(&msg, 0, sizeof(msg));
659 	msg.spec = MSG_NEWHOSTIF;
660 	msg.len = cpu_to_le16(0);
661 
662 	/* If we're not using the old interface, switching seems bogus */
663 	WARN_ON(mod->iftype != 0);
664 
665 	ret = ican3_send_msg(mod, &msg);
666 	if (ret)
667 		return ret;
668 
669 	/* mark the module as using the new host interface */
670 	mod->iftype = 1;
671 	return 0;
672 }
673 
674 static int __devinit ican3_msg_fasthostif(struct ican3_dev *mod)
675 {
676 	struct ican3_msg msg;
677 	unsigned int addr;
678 
679 	memset(&msg, 0, sizeof(msg));
680 	msg.spec = MSG_INITFDPMQUEUE;
681 	msg.len = cpu_to_le16(8);
682 
683 	/* write the tohost queue start address */
684 	addr = DPM_PAGE_ADDR(mod->fastrx_start);
685 	msg.data[0] = addr & 0xff;
686 	msg.data[1] = (addr >> 8) & 0xff;
687 	msg.data[2] = (addr >> 16) & 0xff;
688 	msg.data[3] = (addr >> 24) & 0xff;
689 
690 	/* write the fromhost queue start address */
691 	addr = DPM_PAGE_ADDR(mod->fasttx_start);
692 	msg.data[4] = addr & 0xff;
693 	msg.data[5] = (addr >> 8) & 0xff;
694 	msg.data[6] = (addr >> 16) & 0xff;
695 	msg.data[7] = (addr >> 24) & 0xff;
696 
697 	/* If we're not using the new interface yet, we cannot do this */
698 	WARN_ON(mod->iftype != 1);
699 
700 	return ican3_send_msg(mod, &msg);
701 }
702 
703 /*
704  * Setup the CAN filter to either accept or reject all
705  * messages from the CAN bus.
706  */
707 static int __devinit ican3_set_id_filter(struct ican3_dev *mod, bool accept)
708 {
709 	struct ican3_msg msg;
710 	int ret;
711 
712 	/* Standard Frame Format */
713 	memset(&msg, 0, sizeof(msg));
714 	msg.spec = MSG_SETAFILMASK;
715 	msg.len = cpu_to_le16(5);
716 	msg.data[0] = 0x00; /* IDLo LSB */
717 	msg.data[1] = 0x00; /* IDLo MSB */
718 	msg.data[2] = 0xff; /* IDHi LSB */
719 	msg.data[3] = 0x07; /* IDHi MSB */
720 
721 	/* accept all frames for fast host if, or reject all frames */
722 	msg.data[4] = accept ? SETAFILMASK_FASTIF : SETAFILMASK_REJECT;
723 
724 	ret = ican3_send_msg(mod, &msg);
725 	if (ret)
726 		return ret;
727 
728 	/* Extended Frame Format */
729 	memset(&msg, 0, sizeof(msg));
730 	msg.spec = MSG_SETAFILMASK;
731 	msg.len = cpu_to_le16(13);
732 	msg.data[0] = 0;    /* MUX = 0 */
733 	msg.data[1] = 0x00; /* IDLo LSB */
734 	msg.data[2] = 0x00;
735 	msg.data[3] = 0x00;
736 	msg.data[4] = 0x20; /* IDLo MSB */
737 	msg.data[5] = 0xff; /* IDHi LSB */
738 	msg.data[6] = 0xff;
739 	msg.data[7] = 0xff;
740 	msg.data[8] = 0x3f; /* IDHi MSB */
741 
742 	/* accept all frames for fast host if, or reject all frames */
743 	msg.data[9] = accept ? SETAFILMASK_FASTIF : SETAFILMASK_REJECT;
744 
745 	return ican3_send_msg(mod, &msg);
746 }
747 
748 /*
749  * Bring the CAN bus online or offline
750  */
751 static int ican3_set_bus_state(struct ican3_dev *mod, bool on)
752 {
753 	struct ican3_msg msg;
754 
755 	memset(&msg, 0, sizeof(msg));
756 	msg.spec = on ? MSG_CONREQ : MSG_COFFREQ;
757 	msg.len = cpu_to_le16(0);
758 
759 	return ican3_send_msg(mod, &msg);
760 }
761 
762 static int ican3_set_termination(struct ican3_dev *mod, bool on)
763 {
764 	struct ican3_msg msg;
765 
766 	memset(&msg, 0, sizeof(msg));
767 	msg.spec = MSG_HWCONF;
768 	msg.len = cpu_to_le16(2);
769 	msg.data[0] = 0x00;
770 	msg.data[1] = on ? HWCONF_TERMINATE_ON : HWCONF_TERMINATE_OFF;
771 
772 	return ican3_send_msg(mod, &msg);
773 }
774 
775 static int ican3_send_inquiry(struct ican3_dev *mod, u8 subspec)
776 {
777 	struct ican3_msg msg;
778 
779 	memset(&msg, 0, sizeof(msg));
780 	msg.spec = MSG_INQUIRY;
781 	msg.len = cpu_to_le16(2);
782 	msg.data[0] = subspec;
783 	msg.data[1] = 0x00;
784 
785 	return ican3_send_msg(mod, &msg);
786 }
787 
788 static int ican3_set_buserror(struct ican3_dev *mod, u8 quota)
789 {
790 	struct ican3_msg msg;
791 
792 	memset(&msg, 0, sizeof(msg));
793 	msg.spec = MSG_CCONFREQ;
794 	msg.len = cpu_to_le16(2);
795 	msg.data[0] = 0x00;
796 	msg.data[1] = quota;
797 
798 	return ican3_send_msg(mod, &msg);
799 }
800 
801 /*
802  * ICAN3 to Linux CAN Frame Conversion
803  */
804 
805 static void ican3_to_can_frame(struct ican3_dev *mod,
806 			       struct ican3_fast_desc *desc,
807 			       struct can_frame *cf)
808 {
809 	if ((desc->command & ICAN3_CAN_TYPE_MASK) == ICAN3_CAN_TYPE_SFF) {
810 		if (desc->data[1] & ICAN3_SFF_RTR)
811 			cf->can_id |= CAN_RTR_FLAG;
812 
813 		cf->can_id |= desc->data[0] << 3;
814 		cf->can_id |= (desc->data[1] & 0xe0) >> 5;
815 		cf->can_dlc = desc->data[1] & ICAN3_CAN_DLC_MASK;
816 		memcpy(cf->data, &desc->data[2], sizeof(cf->data));
817 	} else {
818 		cf->can_dlc = desc->data[0] & ICAN3_CAN_DLC_MASK;
819 		if (desc->data[0] & ICAN3_EFF_RTR)
820 			cf->can_id |= CAN_RTR_FLAG;
821 
822 		if (desc->data[0] & ICAN3_EFF) {
823 			cf->can_id |= CAN_EFF_FLAG;
824 			cf->can_id |= desc->data[2] << 21; /* 28-21 */
825 			cf->can_id |= desc->data[3] << 13; /* 20-13 */
826 			cf->can_id |= desc->data[4] << 5;  /* 12-5  */
827 			cf->can_id |= (desc->data[5] & 0xf8) >> 3;
828 		} else {
829 			cf->can_id |= desc->data[2] << 3;  /* 10-3  */
830 			cf->can_id |= desc->data[3] >> 5;  /* 2-0   */
831 		}
832 
833 		memcpy(cf->data, &desc->data[6], sizeof(cf->data));
834 	}
835 }
836 
837 static void can_frame_to_ican3(struct ican3_dev *mod,
838 			       struct can_frame *cf,
839 			       struct ican3_fast_desc *desc)
840 {
841 	/* clear out any stale data in the descriptor */
842 	memset(desc->data, 0, sizeof(desc->data));
843 
844 	/* we always use the extended format, with the ECHO flag set */
845 	desc->command = ICAN3_CAN_TYPE_EFF;
846 	desc->data[0] |= cf->can_dlc;
847 	desc->data[1] |= ICAN3_ECHO;
848 
849 	if (cf->can_id & CAN_RTR_FLAG)
850 		desc->data[0] |= ICAN3_EFF_RTR;
851 
852 	/* pack the id into the correct places */
853 	if (cf->can_id & CAN_EFF_FLAG) {
854 		desc->data[0] |= ICAN3_EFF;
855 		desc->data[2] = (cf->can_id & 0x1fe00000) >> 21; /* 28-21 */
856 		desc->data[3] = (cf->can_id & 0x001fe000) >> 13; /* 20-13 */
857 		desc->data[4] = (cf->can_id & 0x00001fe0) >> 5;  /* 12-5  */
858 		desc->data[5] = (cf->can_id & 0x0000001f) << 3;  /* 4-0   */
859 	} else {
860 		desc->data[2] = (cf->can_id & 0x7F8) >> 3; /* bits 10-3 */
861 		desc->data[3] = (cf->can_id & 0x007) << 5; /* bits 2-0  */
862 	}
863 
864 	/* copy the data bits into the descriptor */
865 	memcpy(&desc->data[6], cf->data, sizeof(cf->data));
866 }
867 
868 /*
869  * Interrupt Handling
870  */
871 
872 /*
873  * Handle an ID + Version message response from the firmware. We never generate
874  * this message in production code, but it is very useful when debugging to be
875  * able to display this message.
876  */
877 static void ican3_handle_idvers(struct ican3_dev *mod, struct ican3_msg *msg)
878 {
879 	dev_dbg(mod->dev, "IDVERS response: %s\n", msg->data);
880 }
881 
882 static void ican3_handle_msglost(struct ican3_dev *mod, struct ican3_msg *msg)
883 {
884 	struct net_device *dev = mod->ndev;
885 	struct net_device_stats *stats = &dev->stats;
886 	struct can_frame *cf;
887 	struct sk_buff *skb;
888 
889 	/*
890 	 * Report that communication messages with the microcontroller firmware
891 	 * are being lost. These are never CAN frames, so we do not generate an
892 	 * error frame for userspace
893 	 */
894 	if (msg->spec == MSG_MSGLOST) {
895 		dev_err(mod->dev, "lost %d control messages\n", msg->data[0]);
896 		return;
897 	}
898 
899 	/*
900 	 * Oops, this indicates that we have lost messages in the fast queue,
901 	 * which are exclusively CAN messages. Our driver isn't reading CAN
902 	 * frames fast enough.
903 	 *
904 	 * We'll pretend that the SJA1000 told us that it ran out of buffer
905 	 * space, because there is not a better message for this.
906 	 */
907 	skb = alloc_can_err_skb(dev, &cf);
908 	if (skb) {
909 		cf->can_id |= CAN_ERR_CRTL;
910 		cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
911 		stats->rx_errors++;
912 		stats->rx_bytes += cf->can_dlc;
913 		netif_rx(skb);
914 	}
915 }
916 
917 /*
918  * Handle CAN Event Indication Messages from the firmware
919  *
920  * The ICAN3 firmware provides the values of some SJA1000 registers when it
921  * generates this message. The code below is largely copied from the
922  * drivers/net/can/sja1000/sja1000.c file, and adapted as necessary
923  */
924 static int ican3_handle_cevtind(struct ican3_dev *mod, struct ican3_msg *msg)
925 {
926 	struct net_device *dev = mod->ndev;
927 	struct net_device_stats *stats = &dev->stats;
928 	enum can_state state = mod->can.state;
929 	u8 status, isrc, rxerr, txerr;
930 	struct can_frame *cf;
931 	struct sk_buff *skb;
932 
933 	/* we can only handle the SJA1000 part */
934 	if (msg->data[1] != CEVTIND_CHIP_SJA1000) {
935 		dev_err(mod->dev, "unable to handle errors on non-SJA1000\n");
936 		return -ENODEV;
937 	}
938 
939 	/* check the message length for sanity */
940 	if (le16_to_cpu(msg->len) < 6) {
941 		dev_err(mod->dev, "error message too short\n");
942 		return -EINVAL;
943 	}
944 
945 	skb = alloc_can_err_skb(dev, &cf);
946 	if (skb == NULL)
947 		return -ENOMEM;
948 
949 	isrc = msg->data[0];
950 	status = msg->data[3];
951 	rxerr = msg->data[4];
952 	txerr = msg->data[5];
953 
954 	/* data overrun interrupt */
955 	if (isrc == CEVTIND_DOI || isrc == CEVTIND_LOST) {
956 		dev_dbg(mod->dev, "data overrun interrupt\n");
957 		cf->can_id |= CAN_ERR_CRTL;
958 		cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
959 		stats->rx_over_errors++;
960 		stats->rx_errors++;
961 	}
962 
963 	/* error warning + passive interrupt */
964 	if (isrc == CEVTIND_EI) {
965 		dev_dbg(mod->dev, "error warning + passive interrupt\n");
966 		if (status & SR_BS) {
967 			state = CAN_STATE_BUS_OFF;
968 			cf->can_id |= CAN_ERR_BUSOFF;
969 			can_bus_off(dev);
970 		} else if (status & SR_ES) {
971 			if (rxerr >= 128 || txerr >= 128)
972 				state = CAN_STATE_ERROR_PASSIVE;
973 			else
974 				state = CAN_STATE_ERROR_WARNING;
975 		} else {
976 			state = CAN_STATE_ERROR_ACTIVE;
977 		}
978 	}
979 
980 	/* bus error interrupt */
981 	if (isrc == CEVTIND_BEI) {
982 		u8 ecc = msg->data[2];
983 
984 		dev_dbg(mod->dev, "bus error interrupt\n");
985 		mod->can.can_stats.bus_error++;
986 		stats->rx_errors++;
987 		cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
988 
989 		switch (ecc & ECC_MASK) {
990 		case ECC_BIT:
991 			cf->data[2] |= CAN_ERR_PROT_BIT;
992 			break;
993 		case ECC_FORM:
994 			cf->data[2] |= CAN_ERR_PROT_FORM;
995 			break;
996 		case ECC_STUFF:
997 			cf->data[2] |= CAN_ERR_PROT_STUFF;
998 			break;
999 		default:
1000 			cf->data[2] |= CAN_ERR_PROT_UNSPEC;
1001 			cf->data[3] = ecc & ECC_SEG;
1002 			break;
1003 		}
1004 
1005 		if ((ecc & ECC_DIR) == 0)
1006 			cf->data[2] |= CAN_ERR_PROT_TX;
1007 
1008 		cf->data[6] = txerr;
1009 		cf->data[7] = rxerr;
1010 	}
1011 
1012 	if (state != mod->can.state && (state == CAN_STATE_ERROR_WARNING ||
1013 					state == CAN_STATE_ERROR_PASSIVE)) {
1014 		cf->can_id |= CAN_ERR_CRTL;
1015 		if (state == CAN_STATE_ERROR_WARNING) {
1016 			mod->can.can_stats.error_warning++;
1017 			cf->data[1] = (txerr > rxerr) ?
1018 				CAN_ERR_CRTL_TX_WARNING :
1019 				CAN_ERR_CRTL_RX_WARNING;
1020 		} else {
1021 			mod->can.can_stats.error_passive++;
1022 			cf->data[1] = (txerr > rxerr) ?
1023 				CAN_ERR_CRTL_TX_PASSIVE :
1024 				CAN_ERR_CRTL_RX_PASSIVE;
1025 		}
1026 
1027 		cf->data[6] = txerr;
1028 		cf->data[7] = rxerr;
1029 	}
1030 
1031 	mod->can.state = state;
1032 	stats->rx_errors++;
1033 	stats->rx_bytes += cf->can_dlc;
1034 	netif_rx(skb);
1035 	return 0;
1036 }
1037 
1038 static void ican3_handle_inquiry(struct ican3_dev *mod, struct ican3_msg *msg)
1039 {
1040 	switch (msg->data[0]) {
1041 	case INQUIRY_STATUS:
1042 	case INQUIRY_EXTENDED:
1043 		mod->bec.rxerr = msg->data[5];
1044 		mod->bec.txerr = msg->data[6];
1045 		complete(&mod->buserror_comp);
1046 		break;
1047 	case INQUIRY_TERMINATION:
1048 		mod->termination_enabled = msg->data[6] & HWCONF_TERMINATE_ON;
1049 		complete(&mod->termination_comp);
1050 		break;
1051 	default:
1052 		dev_err(mod->dev, "recieved an unknown inquiry response\n");
1053 		break;
1054 	}
1055 }
1056 
1057 static void ican3_handle_unknown_message(struct ican3_dev *mod,
1058 					struct ican3_msg *msg)
1059 {
1060 	dev_warn(mod->dev, "recieved unknown message: spec 0x%.2x length %d\n",
1061 			   msg->spec, le16_to_cpu(msg->len));
1062 }
1063 
1064 /*
1065  * Handle a control message from the firmware
1066  */
1067 static void ican3_handle_message(struct ican3_dev *mod, struct ican3_msg *msg)
1068 {
1069 	dev_dbg(mod->dev, "%s: modno %d spec 0x%.2x len %d bytes\n", __func__,
1070 			   mod->num, msg->spec, le16_to_cpu(msg->len));
1071 
1072 	switch (msg->spec) {
1073 	case MSG_IDVERS:
1074 		ican3_handle_idvers(mod, msg);
1075 		break;
1076 	case MSG_MSGLOST:
1077 	case MSG_FMSGLOST:
1078 		ican3_handle_msglost(mod, msg);
1079 		break;
1080 	case MSG_CEVTIND:
1081 		ican3_handle_cevtind(mod, msg);
1082 		break;
1083 	case MSG_INQUIRY:
1084 		ican3_handle_inquiry(mod, msg);
1085 		break;
1086 	default:
1087 		ican3_handle_unknown_message(mod, msg);
1088 		break;
1089 	}
1090 }
1091 
1092 /*
1093  * Check that there is room in the TX ring to transmit another skb
1094  *
1095  * LOCKING: must hold mod->lock
1096  */
1097 static bool ican3_txok(struct ican3_dev *mod)
1098 {
1099 	struct ican3_fast_desc __iomem *desc;
1100 	u8 control;
1101 
1102 	/* copy the control bits of the descriptor */
1103 	ican3_set_page(mod, mod->fasttx_start + (mod->fasttx_num / 16));
1104 	desc = mod->dpm + ((mod->fasttx_num % 16) * sizeof(*desc));
1105 	control = ioread8(&desc->control);
1106 
1107 	/* if the control bits are not valid, then we have no more space */
1108 	if (!(control & DESC_VALID))
1109 		return false;
1110 
1111 	return true;
1112 }
1113 
1114 /*
1115  * Recieve one CAN frame from the hardware
1116  *
1117  * CONTEXT: must be called from user context
1118  */
1119 static int ican3_recv_skb(struct ican3_dev *mod)
1120 {
1121 	struct net_device *ndev = mod->ndev;
1122 	struct net_device_stats *stats = &ndev->stats;
1123 	struct ican3_fast_desc desc;
1124 	void __iomem *desc_addr;
1125 	struct can_frame *cf;
1126 	struct sk_buff *skb;
1127 	unsigned long flags;
1128 
1129 	spin_lock_irqsave(&mod->lock, flags);
1130 
1131 	/* copy the whole descriptor */
1132 	ican3_set_page(mod, mod->fastrx_start + (mod->fastrx_num / 16));
1133 	desc_addr = mod->dpm + ((mod->fastrx_num % 16) * sizeof(desc));
1134 	memcpy_fromio(&desc, desc_addr, sizeof(desc));
1135 
1136 	spin_unlock_irqrestore(&mod->lock, flags);
1137 
1138 	/* check that we actually have a CAN frame */
1139 	if (!(desc.control & DESC_VALID))
1140 		return -ENOBUFS;
1141 
1142 	/* allocate an skb */
1143 	skb = alloc_can_skb(ndev, &cf);
1144 	if (unlikely(skb == NULL)) {
1145 		stats->rx_dropped++;
1146 		goto err_noalloc;
1147 	}
1148 
1149 	/* convert the ICAN3 frame into Linux CAN format */
1150 	ican3_to_can_frame(mod, &desc, cf);
1151 
1152 	/* receive the skb, update statistics */
1153 	netif_receive_skb(skb);
1154 	stats->rx_packets++;
1155 	stats->rx_bytes += cf->can_dlc;
1156 
1157 err_noalloc:
1158 	/* toggle the valid bit and return the descriptor to the ring */
1159 	desc.control ^= DESC_VALID;
1160 
1161 	spin_lock_irqsave(&mod->lock, flags);
1162 
1163 	ican3_set_page(mod, mod->fastrx_start + (mod->fastrx_num / 16));
1164 	memcpy_toio(desc_addr, &desc, 1);
1165 
1166 	/* update the next buffer pointer */
1167 	mod->fastrx_num = (desc.control & DESC_WRAP) ? 0
1168 						     : (mod->fastrx_num + 1);
1169 
1170 	/* there are still more buffers to process */
1171 	spin_unlock_irqrestore(&mod->lock, flags);
1172 	return 0;
1173 }
1174 
1175 static int ican3_napi(struct napi_struct *napi, int budget)
1176 {
1177 	struct ican3_dev *mod = container_of(napi, struct ican3_dev, napi);
1178 	struct ican3_msg msg;
1179 	unsigned long flags;
1180 	int received = 0;
1181 	int ret;
1182 
1183 	/* process all communication messages */
1184 	while (true) {
1185 		ret = ican3_recv_msg(mod, &msg);
1186 		if (ret)
1187 			break;
1188 
1189 		ican3_handle_message(mod, &msg);
1190 	}
1191 
1192 	/* process all CAN frames from the fast interface */
1193 	while (received < budget) {
1194 		ret = ican3_recv_skb(mod);
1195 		if (ret)
1196 			break;
1197 
1198 		received++;
1199 	}
1200 
1201 	/* We have processed all packets that the adapter had, but it
1202 	 * was less than our budget, stop polling */
1203 	if (received < budget)
1204 		napi_complete(napi);
1205 
1206 	spin_lock_irqsave(&mod->lock, flags);
1207 
1208 	/* Wake up the transmit queue if necessary */
1209 	if (netif_queue_stopped(mod->ndev) && ican3_txok(mod))
1210 		netif_wake_queue(mod->ndev);
1211 
1212 	spin_unlock_irqrestore(&mod->lock, flags);
1213 
1214 	/* re-enable interrupt generation */
1215 	iowrite8(1 << mod->num, &mod->ctrl->int_enable);
1216 	return received;
1217 }
1218 
1219 static irqreturn_t ican3_irq(int irq, void *dev_id)
1220 {
1221 	struct ican3_dev *mod = dev_id;
1222 	u8 stat;
1223 
1224 	/*
1225 	 * The interrupt status register on this device reports interrupts
1226 	 * as zeroes instead of using ones like most other devices
1227 	 */
1228 	stat = ioread8(&mod->ctrl->int_disable) & (1 << mod->num);
1229 	if (stat == (1 << mod->num))
1230 		return IRQ_NONE;
1231 
1232 	/* clear the MODULbus interrupt from the microcontroller */
1233 	ioread8(&mod->dpmctrl->interrupt);
1234 
1235 	/* disable interrupt generation, schedule the NAPI poller */
1236 	iowrite8(1 << mod->num, &mod->ctrl->int_disable);
1237 	napi_schedule(&mod->napi);
1238 	return IRQ_HANDLED;
1239 }
1240 
1241 /*
1242  * Firmware reset, startup, and shutdown
1243  */
1244 
1245 /*
1246  * Reset an ICAN module to its power-on state
1247  *
1248  * CONTEXT: no network device registered
1249  */
1250 static int ican3_reset_module(struct ican3_dev *mod)
1251 {
1252 	u8 val = 1 << mod->num;
1253 	unsigned long start;
1254 	u8 runold, runnew;
1255 
1256 	/* disable interrupts so no more work is scheduled */
1257 	iowrite8(1 << mod->num, &mod->ctrl->int_disable);
1258 
1259 	/* the first unallocated page in the DPM is #9 */
1260 	mod->free_page = DPM_FREE_START;
1261 
1262 	ican3_set_page(mod, QUEUE_OLD_CONTROL);
1263 	runold = ioread8(mod->dpm + TARGET_RUNNING);
1264 
1265 	/* reset the module */
1266 	iowrite8(val, &mod->ctrl->reset_assert);
1267 	iowrite8(val, &mod->ctrl->reset_deassert);
1268 
1269 	/* wait until the module has finished resetting and is running */
1270 	start = jiffies;
1271 	do {
1272 		ican3_set_page(mod, QUEUE_OLD_CONTROL);
1273 		runnew = ioread8(mod->dpm + TARGET_RUNNING);
1274 		if (runnew == (runold ^ 0xff))
1275 			return 0;
1276 
1277 		msleep(10);
1278 	} while (time_before(jiffies, start + HZ / 4));
1279 
1280 	dev_err(mod->dev, "failed to reset CAN module\n");
1281 	return -ETIMEDOUT;
1282 }
1283 
1284 static void __devexit ican3_shutdown_module(struct ican3_dev *mod)
1285 {
1286 	ican3_msg_disconnect(mod);
1287 	ican3_reset_module(mod);
1288 }
1289 
1290 /*
1291  * Startup an ICAN module, bringing it into fast mode
1292  */
1293 static int __devinit ican3_startup_module(struct ican3_dev *mod)
1294 {
1295 	int ret;
1296 
1297 	ret = ican3_reset_module(mod);
1298 	if (ret) {
1299 		dev_err(mod->dev, "unable to reset module\n");
1300 		return ret;
1301 	}
1302 
1303 	/* re-enable interrupts so we can send messages */
1304 	iowrite8(1 << mod->num, &mod->ctrl->int_enable);
1305 
1306 	ret = ican3_msg_connect(mod);
1307 	if (ret) {
1308 		dev_err(mod->dev, "unable to connect to module\n");
1309 		return ret;
1310 	}
1311 
1312 	ican3_init_new_host_interface(mod);
1313 	ret = ican3_msg_newhostif(mod);
1314 	if (ret) {
1315 		dev_err(mod->dev, "unable to switch to new-style interface\n");
1316 		return ret;
1317 	}
1318 
1319 	/* default to "termination on" */
1320 	ret = ican3_set_termination(mod, true);
1321 	if (ret) {
1322 		dev_err(mod->dev, "unable to enable termination\n");
1323 		return ret;
1324 	}
1325 
1326 	/* default to "bus errors enabled" */
1327 	ret = ican3_set_buserror(mod, ICAN3_BUSERR_QUOTA_MAX);
1328 	if (ret) {
1329 		dev_err(mod->dev, "unable to set bus-error\n");
1330 		return ret;
1331 	}
1332 
1333 	ican3_init_fast_host_interface(mod);
1334 	ret = ican3_msg_fasthostif(mod);
1335 	if (ret) {
1336 		dev_err(mod->dev, "unable to switch to fast host interface\n");
1337 		return ret;
1338 	}
1339 
1340 	ret = ican3_set_id_filter(mod, true);
1341 	if (ret) {
1342 		dev_err(mod->dev, "unable to set acceptance filter\n");
1343 		return ret;
1344 	}
1345 
1346 	return 0;
1347 }
1348 
1349 /*
1350  * CAN Network Device
1351  */
1352 
1353 static int ican3_open(struct net_device *ndev)
1354 {
1355 	struct ican3_dev *mod = netdev_priv(ndev);
1356 	u8 quota;
1357 	int ret;
1358 
1359 	/* open the CAN layer */
1360 	ret = open_candev(ndev);
1361 	if (ret) {
1362 		dev_err(mod->dev, "unable to start CAN layer\n");
1363 		return ret;
1364 	}
1365 
1366 	/* set the bus error generation state appropriately */
1367 	if (mod->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
1368 		quota = ICAN3_BUSERR_QUOTA_MAX;
1369 	else
1370 		quota = 0;
1371 
1372 	ret = ican3_set_buserror(mod, quota);
1373 	if (ret) {
1374 		dev_err(mod->dev, "unable to set bus-error\n");
1375 		close_candev(ndev);
1376 		return ret;
1377 	}
1378 
1379 	/* bring the bus online */
1380 	ret = ican3_set_bus_state(mod, true);
1381 	if (ret) {
1382 		dev_err(mod->dev, "unable to set bus-on\n");
1383 		close_candev(ndev);
1384 		return ret;
1385 	}
1386 
1387 	/* start up the network device */
1388 	mod->can.state = CAN_STATE_ERROR_ACTIVE;
1389 	netif_start_queue(ndev);
1390 
1391 	return 0;
1392 }
1393 
1394 static int ican3_stop(struct net_device *ndev)
1395 {
1396 	struct ican3_dev *mod = netdev_priv(ndev);
1397 	int ret;
1398 
1399 	/* stop the network device xmit routine */
1400 	netif_stop_queue(ndev);
1401 	mod->can.state = CAN_STATE_STOPPED;
1402 
1403 	/* bring the bus offline, stop receiving packets */
1404 	ret = ican3_set_bus_state(mod, false);
1405 	if (ret) {
1406 		dev_err(mod->dev, "unable to set bus-off\n");
1407 		return ret;
1408 	}
1409 
1410 	/* close the CAN layer */
1411 	close_candev(ndev);
1412 	return 0;
1413 }
1414 
1415 static int ican3_xmit(struct sk_buff *skb, struct net_device *ndev)
1416 {
1417 	struct ican3_dev *mod = netdev_priv(ndev);
1418 	struct net_device_stats *stats = &ndev->stats;
1419 	struct can_frame *cf = (struct can_frame *)skb->data;
1420 	struct ican3_fast_desc desc;
1421 	void __iomem *desc_addr;
1422 	unsigned long flags;
1423 
1424 	spin_lock_irqsave(&mod->lock, flags);
1425 
1426 	/* check that we can actually transmit */
1427 	if (!ican3_txok(mod)) {
1428 		dev_err(mod->dev, "no free descriptors, stopping queue\n");
1429 		netif_stop_queue(ndev);
1430 		spin_unlock_irqrestore(&mod->lock, flags);
1431 		return NETDEV_TX_BUSY;
1432 	}
1433 
1434 	/* copy the control bits of the descriptor */
1435 	ican3_set_page(mod, mod->fasttx_start + (mod->fasttx_num / 16));
1436 	desc_addr = mod->dpm + ((mod->fasttx_num % 16) * sizeof(desc));
1437 	memset(&desc, 0, sizeof(desc));
1438 	memcpy_fromio(&desc, desc_addr, 1);
1439 
1440 	/* convert the Linux CAN frame into ICAN3 format */
1441 	can_frame_to_ican3(mod, cf, &desc);
1442 
1443 	/*
1444 	 * the programming manual says that you must set the IVALID bit, then
1445 	 * interrupt, then set the valid bit. Quite weird, but it seems to be
1446 	 * required for this to work
1447 	 */
1448 	desc.control |= DESC_IVALID;
1449 	memcpy_toio(desc_addr, &desc, sizeof(desc));
1450 
1451 	/* generate a MODULbus interrupt to the microcontroller */
1452 	iowrite8(0x01, &mod->dpmctrl->interrupt);
1453 
1454 	desc.control ^= DESC_VALID;
1455 	memcpy_toio(desc_addr, &desc, sizeof(desc));
1456 
1457 	/* update the next buffer pointer */
1458 	mod->fasttx_num = (desc.control & DESC_WRAP) ? 0
1459 						     : (mod->fasttx_num + 1);
1460 
1461 	/* update statistics */
1462 	stats->tx_packets++;
1463 	stats->tx_bytes += cf->can_dlc;
1464 	kfree_skb(skb);
1465 
1466 	/*
1467 	 * This hardware doesn't have TX-done notifications, so we'll try and
1468 	 * emulate it the best we can using ECHO skbs. Get the next TX
1469 	 * descriptor, and see if we have room to send. If not, stop the queue.
1470 	 * It will be woken when the ECHO skb for the current packet is recv'd.
1471 	 */
1472 
1473 	/* copy the control bits of the descriptor */
1474 	if (!ican3_txok(mod))
1475 		netif_stop_queue(ndev);
1476 
1477 	spin_unlock_irqrestore(&mod->lock, flags);
1478 	return NETDEV_TX_OK;
1479 }
1480 
1481 static const struct net_device_ops ican3_netdev_ops = {
1482 	.ndo_open	= ican3_open,
1483 	.ndo_stop	= ican3_stop,
1484 	.ndo_start_xmit	= ican3_xmit,
1485 };
1486 
1487 /*
1488  * Low-level CAN Device
1489  */
1490 
1491 /* This structure was stolen from drivers/net/can/sja1000/sja1000.c */
1492 static struct can_bittiming_const ican3_bittiming_const = {
1493 	.name = DRV_NAME,
1494 	.tseg1_min = 1,
1495 	.tseg1_max = 16,
1496 	.tseg2_min = 1,
1497 	.tseg2_max = 8,
1498 	.sjw_max = 4,
1499 	.brp_min = 1,
1500 	.brp_max = 64,
1501 	.brp_inc = 1,
1502 };
1503 
1504 /*
1505  * This routine was stolen from drivers/net/can/sja1000/sja1000.c
1506  *
1507  * The bittiming register command for the ICAN3 just sets the bit timing
1508  * registers on the SJA1000 chip directly
1509  */
1510 static int ican3_set_bittiming(struct net_device *ndev)
1511 {
1512 	struct ican3_dev *mod = netdev_priv(ndev);
1513 	struct can_bittiming *bt = &mod->can.bittiming;
1514 	struct ican3_msg msg;
1515 	u8 btr0, btr1;
1516 
1517 	btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
1518 	btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
1519 		(((bt->phase_seg2 - 1) & 0x7) << 4);
1520 	if (mod->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
1521 		btr1 |= 0x80;
1522 
1523 	memset(&msg, 0, sizeof(msg));
1524 	msg.spec = MSG_CBTRREQ;
1525 	msg.len = cpu_to_le16(4);
1526 	msg.data[0] = 0x00;
1527 	msg.data[1] = 0x00;
1528 	msg.data[2] = btr0;
1529 	msg.data[3] = btr1;
1530 
1531 	return ican3_send_msg(mod, &msg);
1532 }
1533 
1534 static int ican3_set_mode(struct net_device *ndev, enum can_mode mode)
1535 {
1536 	struct ican3_dev *mod = netdev_priv(ndev);
1537 	int ret;
1538 
1539 	if (mode != CAN_MODE_START)
1540 		return -ENOTSUPP;
1541 
1542 	/* bring the bus online */
1543 	ret = ican3_set_bus_state(mod, true);
1544 	if (ret) {
1545 		dev_err(mod->dev, "unable to set bus-on\n");
1546 		return ret;
1547 	}
1548 
1549 	/* start up the network device */
1550 	mod->can.state = CAN_STATE_ERROR_ACTIVE;
1551 
1552 	if (netif_queue_stopped(ndev))
1553 		netif_wake_queue(ndev);
1554 
1555 	return 0;
1556 }
1557 
1558 static int ican3_get_berr_counter(const struct net_device *ndev,
1559 				  struct can_berr_counter *bec)
1560 {
1561 	struct ican3_dev *mod = netdev_priv(ndev);
1562 	int ret;
1563 
1564 	ret = ican3_send_inquiry(mod, INQUIRY_STATUS);
1565 	if (ret)
1566 		return ret;
1567 
1568 	ret = wait_for_completion_timeout(&mod->buserror_comp, HZ);
1569 	if (ret <= 0) {
1570 		dev_info(mod->dev, "%s timed out\n", __func__);
1571 		return -ETIMEDOUT;
1572 	}
1573 
1574 	bec->rxerr = mod->bec.rxerr;
1575 	bec->txerr = mod->bec.txerr;
1576 	return 0;
1577 }
1578 
1579 /*
1580  * Sysfs Attributes
1581  */
1582 
1583 static ssize_t ican3_sysfs_show_term(struct device *dev,
1584 				     struct device_attribute *attr,
1585 				     char *buf)
1586 {
1587 	struct ican3_dev *mod = netdev_priv(to_net_dev(dev));
1588 	int ret;
1589 
1590 	ret = ican3_send_inquiry(mod, INQUIRY_TERMINATION);
1591 	if (ret)
1592 		return ret;
1593 
1594 	ret = wait_for_completion_timeout(&mod->termination_comp, HZ);
1595 	if (ret <= 0) {
1596 		dev_info(mod->dev, "%s timed out\n", __func__);
1597 		return -ETIMEDOUT;
1598 	}
1599 
1600 	return snprintf(buf, PAGE_SIZE, "%u\n", mod->termination_enabled);
1601 }
1602 
1603 static ssize_t ican3_sysfs_set_term(struct device *dev,
1604 				    struct device_attribute *attr,
1605 				    const char *buf, size_t count)
1606 {
1607 	struct ican3_dev *mod = netdev_priv(to_net_dev(dev));
1608 	unsigned long enable;
1609 	int ret;
1610 
1611 	if (strict_strtoul(buf, 0, &enable))
1612 		return -EINVAL;
1613 
1614 	ret = ican3_set_termination(mod, enable);
1615 	if (ret)
1616 		return ret;
1617 
1618 	return count;
1619 }
1620 
1621 static DEVICE_ATTR(termination, S_IWUSR | S_IRUGO, ican3_sysfs_show_term,
1622 						   ican3_sysfs_set_term);
1623 
1624 static struct attribute *ican3_sysfs_attrs[] = {
1625 	&dev_attr_termination.attr,
1626 	NULL,
1627 };
1628 
1629 static struct attribute_group ican3_sysfs_attr_group = {
1630 	.attrs = ican3_sysfs_attrs,
1631 };
1632 
1633 /*
1634  * PCI Subsystem
1635  */
1636 
1637 static int __devinit ican3_probe(struct platform_device *pdev)
1638 {
1639 	struct janz_platform_data *pdata;
1640 	struct net_device *ndev;
1641 	struct ican3_dev *mod;
1642 	struct resource *res;
1643 	struct device *dev;
1644 	int ret;
1645 
1646 	pdata = pdev->dev.platform_data;
1647 	if (!pdata)
1648 		return -ENXIO;
1649 
1650 	dev_dbg(&pdev->dev, "probe: module number %d\n", pdata->modno);
1651 
1652 	/* save the struct device for printing */
1653 	dev = &pdev->dev;
1654 
1655 	/* allocate the CAN device and private data */
1656 	ndev = alloc_candev(sizeof(*mod), 0);
1657 	if (!ndev) {
1658 		dev_err(dev, "unable to allocate CANdev\n");
1659 		ret = -ENOMEM;
1660 		goto out_return;
1661 	}
1662 
1663 	platform_set_drvdata(pdev, ndev);
1664 	mod = netdev_priv(ndev);
1665 	mod->ndev = ndev;
1666 	mod->dev = &pdev->dev;
1667 	mod->num = pdata->modno;
1668 	netif_napi_add(ndev, &mod->napi, ican3_napi, ICAN3_RX_BUFFERS);
1669 	spin_lock_init(&mod->lock);
1670 	init_completion(&mod->termination_comp);
1671 	init_completion(&mod->buserror_comp);
1672 
1673 	/* setup device-specific sysfs attributes */
1674 	ndev->sysfs_groups[0] = &ican3_sysfs_attr_group;
1675 
1676 	/* the first unallocated page in the DPM is 9 */
1677 	mod->free_page = DPM_FREE_START;
1678 
1679 	ndev->netdev_ops = &ican3_netdev_ops;
1680 	ndev->flags |= IFF_ECHO;
1681 	SET_NETDEV_DEV(ndev, &pdev->dev);
1682 
1683 	mod->can.clock.freq = ICAN3_CAN_CLOCK;
1684 	mod->can.bittiming_const = &ican3_bittiming_const;
1685 	mod->can.do_set_bittiming = ican3_set_bittiming;
1686 	mod->can.do_set_mode = ican3_set_mode;
1687 	mod->can.do_get_berr_counter = ican3_get_berr_counter;
1688 	mod->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES
1689 				    | CAN_CTRLMODE_BERR_REPORTING;
1690 
1691 	/* find our IRQ number */
1692 	mod->irq = platform_get_irq(pdev, 0);
1693 	if (mod->irq < 0) {
1694 		dev_err(dev, "IRQ line not found\n");
1695 		ret = -ENODEV;
1696 		goto out_free_ndev;
1697 	}
1698 
1699 	ndev->irq = mod->irq;
1700 
1701 	/* get access to the MODULbus registers for this module */
1702 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1703 	if (!res) {
1704 		dev_err(dev, "MODULbus registers not found\n");
1705 		ret = -ENODEV;
1706 		goto out_free_ndev;
1707 	}
1708 
1709 	mod->dpm = ioremap(res->start, resource_size(res));
1710 	if (!mod->dpm) {
1711 		dev_err(dev, "MODULbus registers not ioremap\n");
1712 		ret = -ENOMEM;
1713 		goto out_free_ndev;
1714 	}
1715 
1716 	mod->dpmctrl = mod->dpm + DPM_PAGE_SIZE;
1717 
1718 	/* get access to the control registers for this module */
1719 	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1720 	if (!res) {
1721 		dev_err(dev, "CONTROL registers not found\n");
1722 		ret = -ENODEV;
1723 		goto out_iounmap_dpm;
1724 	}
1725 
1726 	mod->ctrl = ioremap(res->start, resource_size(res));
1727 	if (!mod->ctrl) {
1728 		dev_err(dev, "CONTROL registers not ioremap\n");
1729 		ret = -ENOMEM;
1730 		goto out_iounmap_dpm;
1731 	}
1732 
1733 	/* disable our IRQ, then hookup the IRQ handler */
1734 	iowrite8(1 << mod->num, &mod->ctrl->int_disable);
1735 	ret = request_irq(mod->irq, ican3_irq, IRQF_SHARED, DRV_NAME, mod);
1736 	if (ret) {
1737 		dev_err(dev, "unable to request IRQ\n");
1738 		goto out_iounmap_ctrl;
1739 	}
1740 
1741 	/* reset and initialize the CAN controller into fast mode */
1742 	napi_enable(&mod->napi);
1743 	ret = ican3_startup_module(mod);
1744 	if (ret) {
1745 		dev_err(dev, "%s: unable to start CANdev\n", __func__);
1746 		goto out_free_irq;
1747 	}
1748 
1749 	/* register with the Linux CAN layer */
1750 	ret = register_candev(ndev);
1751 	if (ret) {
1752 		dev_err(dev, "%s: unable to register CANdev\n", __func__);
1753 		goto out_free_irq;
1754 	}
1755 
1756 	dev_info(dev, "module %d: registered CAN device\n", pdata->modno);
1757 	return 0;
1758 
1759 out_free_irq:
1760 	napi_disable(&mod->napi);
1761 	iowrite8(1 << mod->num, &mod->ctrl->int_disable);
1762 	free_irq(mod->irq, mod);
1763 out_iounmap_ctrl:
1764 	iounmap(mod->ctrl);
1765 out_iounmap_dpm:
1766 	iounmap(mod->dpm);
1767 out_free_ndev:
1768 	free_candev(ndev);
1769 out_return:
1770 	return ret;
1771 }
1772 
1773 static int __devexit ican3_remove(struct platform_device *pdev)
1774 {
1775 	struct net_device *ndev = platform_get_drvdata(pdev);
1776 	struct ican3_dev *mod = netdev_priv(ndev);
1777 
1778 	/* unregister the netdevice, stop interrupts */
1779 	unregister_netdev(ndev);
1780 	napi_disable(&mod->napi);
1781 	iowrite8(1 << mod->num, &mod->ctrl->int_disable);
1782 	free_irq(mod->irq, mod);
1783 
1784 	/* put the module into reset */
1785 	ican3_shutdown_module(mod);
1786 
1787 	/* unmap all registers */
1788 	iounmap(mod->ctrl);
1789 	iounmap(mod->dpm);
1790 
1791 	free_candev(ndev);
1792 
1793 	return 0;
1794 }
1795 
1796 static struct platform_driver ican3_driver = {
1797 	.driver		= {
1798 		.name	= DRV_NAME,
1799 		.owner	= THIS_MODULE,
1800 	},
1801 	.probe		= ican3_probe,
1802 	.remove		= __devexit_p(ican3_remove),
1803 };
1804 
1805 static int __init ican3_init(void)
1806 {
1807 	return platform_driver_register(&ican3_driver);
1808 }
1809 
1810 static void __exit ican3_exit(void)
1811 {
1812 	platform_driver_unregister(&ican3_driver);
1813 }
1814 
1815 MODULE_AUTHOR("Ira W. Snyder <iws@ovro.caltech.edu>");
1816 MODULE_DESCRIPTION("Janz MODULbus VMOD-ICAN3 Driver");
1817 MODULE_LICENSE("GPL");
1818 MODULE_ALIAS("platform:janz-ican3");
1819 
1820 module_init(ican3_init);
1821 module_exit(ican3_exit);
1822