2 * Janz MODULbus VMOD-ICAN3 CAN Interface Driver
4 * Copyright (c) 2010 Ira W. Snyder <iws@ovro.caltech.edu>
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.
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>
19 #include <linux/netdevice.h>
20 #include <linux/can.h>
21 #include <linux/can/dev.h>
22 #include <linux/can/error.h>
24 #include <linux/mfd/janz.h>
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)
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
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
43 #define MSYNC_RB0 0x01
44 #define MSYNC_RB1 0x02
45 #define MSYNC_RBLW 0x04
46 #define MSYNC_RB_MASK (MSYNC_RB0 | MSYNC_RB1)
48 #define MSYNC_WB0 0x10
49 #define MSYNC_WB1 0x20
50 #define MSYNC_WBLW 0x40
51 #define MSYNC_WB_MASK (MSYNC_WB0 | MSYNC_WB1)
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
59 /* The first free page in the DPM is #9 */
60 #define DPM_FREE_START 9
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)
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
87 * Janz ICAN3 CAN Inquiry Message Types
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 :(
94 #define INQUIRY_STATUS 0x00
95 #define INQUIRY_TERMINATION 0x01
96 #define INQUIRY_EXTENDED 0x04
98 /* Janz ICAN3 CAN Set Acceptance Filter Mask Message Types */
99 #define SETAFILMASK_REJECT 0x00
100 #define SETAFILMASK_FASTIF 0x02
102 /* Janz ICAN3 CAN Hardware Configuration Message Types */
103 #define HWCONF_TERMINATE_ON 0x01
104 #define HWCONF_TERMINATE_OFF 0x00
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
113 #define CEVTIND_CHIP_SJA1000 0x02
115 #define ICAN3_BUSERR_QUOTA_MAX 255
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
123 #define ICAN3_CAN_TYPE_MASK 0x0f
124 #define ICAN3_CAN_TYPE_SFF 0x00
125 #define ICAN3_CAN_TYPE_EFF 0x01
127 #define ICAN3_CAN_DLC_MASK 0x0f
130 * SJA1000 Status and Error Register Definitions
132 * Copied from drivers/net/can/sja1000/sja1000.h
135 /* status register content */
145 #define SR_CRIT (SR_BS|SR_ES)
152 #define ECC_FORM 0x40
153 #define ECC_STUFF 0x80
154 #define ECC_MASK 0xc0
156 /* Number of buffers for use in the "new-style" host interface */
157 #define ICAN3_NEW_BUFFERS 16
159 /* Number of buffers for use in the "fast" host interface */
160 #define ICAN3_TX_BUFFERS 512
161 #define ICAN3_RX_BUFFERS 1024
163 /* SJA1000 Clock Input */
164 #define ICAN3_CAN_CLOCK 8000000
167 #define DRV_NAME "janz-ican3"
169 /* DPM Control Registers -- starts at offset 0x100 in the MODULbus registers */
170 struct ican3_dpm_control {
171 /* window address register */
176 * Read access: clear interrupt from microcontroller
177 * Write access: send interrupt to microcontroller
182 /* write-only: reset all hardware on the module */
186 /* write-only: generate an interrupt to the TPU */
192 /* must be the first member */
195 /* CAN network device */
196 struct net_device *ndev;
197 struct napi_struct napi;
199 /* Device for printing */
205 /* base address of registers and IRQ */
206 struct janz_cmodio_onboard_regs __iomem *ctrl;
207 struct ican3_dpm_control __iomem *dpmctrl;
211 /* CAN bus termination status */
212 struct completion termination_comp;
213 bool termination_enabled;
215 /* CAN bus error status registers */
216 struct completion buserror_comp;
217 struct can_berr_counter bec;
219 /* old and new style host interface */
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.
230 /* new host interface */
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;
242 /* first free DPM page */
243 unsigned int free_page;
253 struct ican3_new_desc {
258 struct ican3_fast_desc {
264 /* write to the window basic address register */
265 static inline void ican3_set_page(struct ican3_dev *mod, unsigned int page)
267 BUG_ON(page >= DPM_NUM_PAGES);
268 iowrite8(page, &mod->dpmctrl->window_address);
272 * ICAN3 "old-style" host interface
276 * Recieve a message from the ICAN3 "old-style" firmware interface
278 * LOCKING: must hold mod->lock
280 * returns 0 on success, -ENOMEM when no message exists
282 static int ican3_old_recv_msg(struct ican3_dev *mod, struct ican3_msg *msg)
284 unsigned int mbox, mbox_page;
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);
293 if ((xord & MSYNC_RB_MASK) == 0x00) {
294 dev_dbg(mod->dev, "no mbox for reading\n");
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;
302 mbox = (xord & MSYNC_RB0) ? MSYNC_RB0 : MSYNC_RB1;
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));
310 * notify the firmware that the read buffer is available
311 * for it to fill again
315 ican3_set_page(mod, QUEUE_OLD_CONTROL);
316 iowrite8(locl, mod->dpm + MSYNC_LOCL);
321 * Send a message through the "old-style" firmware interface
323 * LOCKING: must hold mod->lock
325 * returns 0 on success, -ENOMEM when no free space exists
327 static int ican3_old_send_msg(struct ican3_dev *mod, struct ican3_msg *msg)
329 unsigned int mbox, mbox_page;
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);
338 if ((xord & MSYNC_WB_MASK) == MSYNC_WB_MASK) {
339 dev_err(mod->dev, "no mbox for writing\n");
343 /* calculate a free mbox to use */
344 mbox = (xord & MSYNC_WB0) ? MSYNC_WB1 : MSYNC_WB0;
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));
352 if (mbox == MSYNC_WB1)
355 ican3_set_page(mod, QUEUE_OLD_CONTROL);
356 iowrite8(locl, mod->dpm + MSYNC_LOCL);
361 * ICAN3 "new-style" Host Interface Setup
364 static void __devinit ican3_init_new_host_interface(struct ican3_dev *mod)
366 struct ican3_new_desc desc;
371 spin_lock_irqsave(&mod->lock, flags);
373 /* setup the internal datastructures for RX */
377 /* tohost queue descriptors are in page 5 */
378 ican3_set_page(mod, QUEUE_TOHOST);
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;
386 /* set wrap flag on last buffer */
387 if (i == ICAN3_NEW_BUFFERS - 1)
388 desc.control |= DESC_WRAP;
390 memcpy_toio(dst, &desc, sizeof(desc));
395 /* fromhost (tx) mid queue descriptors are in page 6 */
396 ican3_set_page(mod, QUEUE_FROMHOST_MID);
399 /* setup the internal datastructures for TX */
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;
407 /* set wrap flag on last buffer */
408 if (i == ICAN3_NEW_BUFFERS - 1)
409 desc.control |= DESC_WRAP;
411 memcpy_toio(dst, &desc, sizeof(desc));
416 /* fromhost hi queue descriptors are in page 7 */
417 ican3_set_page(mod, QUEUE_FROMHOST_HIGH);
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));
426 /* fromhost low queue descriptors are in page 8 */
427 ican3_set_page(mod, QUEUE_FROMHOST_LOW);
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));
436 spin_unlock_irqrestore(&mod->lock, flags);
440 * ICAN3 Fast Host Interface Setup
443 static void __devinit ican3_init_fast_host_interface(struct ican3_dev *mod)
445 struct ican3_fast_desc desc;
451 spin_lock_irqsave(&mod->lock, flags);
453 /* save the start recv page */
454 mod->fastrx_start = mod->free_page;
458 /* build a single fast tohost queue descriptor */
459 memset(&desc, 0, sizeof(desc));
463 /* build the tohost queue descriptor ring in memory */
465 for (i = 0; i < ICAN3_RX_BUFFERS; i++) {
467 /* set the wrap bit on the last buffer */
468 if (i == ICAN3_RX_BUFFERS - 1)
469 desc.control |= DESC_WRAP;
471 /* switch to the correct page */
472 ican3_set_page(mod, mod->free_page);
474 /* copy the descriptor to the DPM */
475 dst = mod->dpm + addr;
476 memcpy_toio(dst, &desc, sizeof(desc));
477 addr += sizeof(desc);
479 /* move to the next page if necessary */
480 if (addr >= DPM_PAGE_SIZE) {
486 /* make sure we page-align the next queue */
490 /* save the start xmit page */
491 mod->fasttx_start = mod->free_page;
494 /* build a single fast fromhost queue descriptor */
495 memset(&desc, 0, sizeof(desc));
496 desc.control = DESC_VALID;
499 /* build the fromhost queue descriptor ring in memory */
501 for (i = 0; i < ICAN3_TX_BUFFERS; i++) {
503 /* set the wrap bit on the last buffer */
504 if (i == ICAN3_TX_BUFFERS - 1)
505 desc.control |= DESC_WRAP;
507 /* switch to the correct page */
508 ican3_set_page(mod, mod->free_page);
510 /* copy the descriptor to the DPM */
511 dst = mod->dpm + addr;
512 memcpy_toio(dst, &desc, sizeof(desc));
513 addr += sizeof(desc);
515 /* move to the next page if necessary */
516 if (addr >= DPM_PAGE_SIZE) {
522 spin_unlock_irqrestore(&mod->lock, flags);
526 * ICAN3 "new-style" Host Interface Message Helpers
530 * LOCKING: must hold mod->lock
532 static int ican3_new_send_msg(struct ican3_dev *mod, struct ican3_msg *msg)
534 struct ican3_new_desc desc;
535 void __iomem *desc_addr = mod->dpm + (mod->tx_num * sizeof(desc));
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));
541 if (!(desc.control & DESC_VALID)) {
542 dev_dbg(mod->dev, "%s: no free buffers\n", __func__);
546 /* switch to the data page, copy the data */
547 ican3_set_page(mod, desc.pointer);
548 memcpy_toio(mod->dpm, msg, sizeof(*msg));
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));
555 /* update the tx number */
556 mod->tx_num = (desc.control & DESC_WRAP) ? 0 : (mod->tx_num + 1);
561 * LOCKING: must hold mod->lock
563 static int ican3_new_recv_msg(struct ican3_dev *mod, struct ican3_msg *msg)
565 struct ican3_new_desc desc;
566 void __iomem *desc_addr = mod->dpm + (mod->rx_num * sizeof(desc));
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));
572 if (!(desc.control & DESC_VALID)) {
573 dev_dbg(mod->dev, "%s: no buffers to recv\n", __func__);
577 /* switch to the data page, copy the data */
578 ican3_set_page(mod, desc.pointer);
579 memcpy_fromio(msg, mod->dpm, sizeof(*msg));
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));
586 /* update the rx number */
587 mod->rx_num = (desc.control & DESC_WRAP) ? 0 : (mod->rx_num + 1);
592 * Message Send / Recv Helpers
595 static int ican3_send_msg(struct ican3_dev *mod, struct ican3_msg *msg)
600 spin_lock_irqsave(&mod->lock, flags);
602 if (mod->iftype == 0)
603 ret = ican3_old_send_msg(mod, msg);
605 ret = ican3_new_send_msg(mod, msg);
607 spin_unlock_irqrestore(&mod->lock, flags);
611 static int ican3_recv_msg(struct ican3_dev *mod, struct ican3_msg *msg)
616 spin_lock_irqsave(&mod->lock, flags);
618 if (mod->iftype == 0)
619 ret = ican3_old_recv_msg(mod, msg);
621 ret = ican3_new_recv_msg(mod, msg);
623 spin_unlock_irqrestore(&mod->lock, flags);
628 * Quick Pre-constructed Messages
631 static int __devinit ican3_msg_connect(struct ican3_dev *mod)
633 struct ican3_msg msg;
635 memset(&msg, 0, sizeof(msg));
636 msg.spec = MSG_CONNECTI;
637 msg.len = cpu_to_le16(0);
639 return ican3_send_msg(mod, &msg);
642 static int __devexit ican3_msg_disconnect(struct ican3_dev *mod)
644 struct ican3_msg msg;
646 memset(&msg, 0, sizeof(msg));
647 msg.spec = MSG_DISCONNECT;
648 msg.len = cpu_to_le16(0);
650 return ican3_send_msg(mod, &msg);
653 static int __devinit ican3_msg_newhostif(struct ican3_dev *mod)
655 struct ican3_msg msg;
658 memset(&msg, 0, sizeof(msg));
659 msg.spec = MSG_NEWHOSTIF;
660 msg.len = cpu_to_le16(0);
662 /* If we're not using the old interface, switching seems bogus */
663 WARN_ON(mod->iftype != 0);
665 ret = ican3_send_msg(mod, &msg);
669 /* mark the module as using the new host interface */
674 static int __devinit ican3_msg_fasthostif(struct ican3_dev *mod)
676 struct ican3_msg msg;
679 memset(&msg, 0, sizeof(msg));
680 msg.spec = MSG_INITFDPMQUEUE;
681 msg.len = cpu_to_le16(8);
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;
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;
697 /* If we're not using the new interface yet, we cannot do this */
698 WARN_ON(mod->iftype != 1);
700 return ican3_send_msg(mod, &msg);
704 * Setup the CAN filter to either accept or reject all
705 * messages from the CAN bus.
707 static int __devinit ican3_set_id_filter(struct ican3_dev *mod, bool accept)
709 struct ican3_msg msg;
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 */
721 /* accept all frames for fast host if, or reject all frames */
722 msg.data[4] = accept ? SETAFILMASK_FASTIF : SETAFILMASK_REJECT;
724 ret = ican3_send_msg(mod, &msg);
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 */
736 msg.data[4] = 0x20; /* IDLo MSB */
737 msg.data[5] = 0xff; /* IDHi LSB */
740 msg.data[8] = 0x3f; /* IDHi MSB */
742 /* accept all frames for fast host if, or reject all frames */
743 msg.data[9] = accept ? SETAFILMASK_FASTIF : SETAFILMASK_REJECT;
745 return ican3_send_msg(mod, &msg);
749 * Bring the CAN bus online or offline
751 static int ican3_set_bus_state(struct ican3_dev *mod, bool on)
753 struct ican3_msg msg;
755 memset(&msg, 0, sizeof(msg));
756 msg.spec = on ? MSG_CONREQ : MSG_COFFREQ;
757 msg.len = cpu_to_le16(0);
759 return ican3_send_msg(mod, &msg);
762 static int ican3_set_termination(struct ican3_dev *mod, bool on)
764 struct ican3_msg msg;
766 memset(&msg, 0, sizeof(msg));
767 msg.spec = MSG_HWCONF;
768 msg.len = cpu_to_le16(2);
770 msg.data[1] = on ? HWCONF_TERMINATE_ON : HWCONF_TERMINATE_OFF;
772 return ican3_send_msg(mod, &msg);
775 static int ican3_send_inquiry(struct ican3_dev *mod, u8 subspec)
777 struct ican3_msg msg;
779 memset(&msg, 0, sizeof(msg));
780 msg.spec = MSG_INQUIRY;
781 msg.len = cpu_to_le16(2);
782 msg.data[0] = subspec;
785 return ican3_send_msg(mod, &msg);
788 static int ican3_set_buserror(struct ican3_dev *mod, u8 quota)
790 struct ican3_msg msg;
792 memset(&msg, 0, sizeof(msg));
793 msg.spec = MSG_CCONFREQ;
794 msg.len = cpu_to_le16(2);
798 return ican3_send_msg(mod, &msg);
802 * ICAN3 to Linux CAN Frame Conversion
805 static void ican3_to_can_frame(struct ican3_dev *mod,
806 struct ican3_fast_desc *desc,
807 struct can_frame *cf)
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;
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));
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;
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;
829 cf->can_id |= desc->data[2] << 3; /* 10-3 */
830 cf->can_id |= desc->data[3] >> 5; /* 2-0 */
833 memcpy(cf->data, &desc->data[6], sizeof(cf->data));
837 static void can_frame_to_ican3(struct ican3_dev *mod,
838 struct can_frame *cf,
839 struct ican3_fast_desc *desc)
841 /* clear out any stale data in the descriptor */
842 memset(desc->data, 0, sizeof(desc->data));
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;
849 if (cf->can_id & CAN_RTR_FLAG)
850 desc->data[0] |= ICAN3_EFF_RTR;
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 */
860 desc->data[2] = (cf->can_id & 0x7F8) >> 3; /* bits 10-3 */
861 desc->data[3] = (cf->can_id & 0x007) << 5; /* bits 2-0 */
864 /* copy the data bits into the descriptor */
865 memcpy(&desc->data[6], cf->data, sizeof(cf->data));
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.
877 static void ican3_handle_idvers(struct ican3_dev *mod, struct ican3_msg *msg)
879 dev_dbg(mod->dev, "IDVERS response: %s\n", msg->data);
882 static void ican3_handle_msglost(struct ican3_dev *mod, struct ican3_msg *msg)
884 struct net_device *dev = mod->ndev;
885 struct net_device_stats *stats = &dev->stats;
886 struct can_frame *cf;
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
894 if (msg->spec == MSG_MSGLOST) {
895 dev_err(mod->dev, "lost %d control messages\n", msg->data[0]);
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.
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.
907 skb = alloc_can_err_skb(dev, &cf);
909 cf->can_id |= CAN_ERR_CRTL;
910 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
912 stats->rx_bytes += cf->can_dlc;
918 * Handle CAN Event Indication Messages from the firmware
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
924 static int ican3_handle_cevtind(struct ican3_dev *mod, struct ican3_msg *msg)
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;
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");
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");
945 skb = alloc_can_err_skb(dev, &cf);
950 status = msg->data[3];
951 rxerr = msg->data[4];
952 txerr = msg->data[5];
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++;
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;
970 } else if (status & SR_ES) {
971 if (rxerr >= 128 || txerr >= 128)
972 state = CAN_STATE_ERROR_PASSIVE;
974 state = CAN_STATE_ERROR_WARNING;
976 state = CAN_STATE_ERROR_ACTIVE;
980 /* bus error interrupt */
981 if (isrc == CEVTIND_BEI) {
982 u8 ecc = msg->data[2];
984 dev_dbg(mod->dev, "bus error interrupt\n");
985 mod->can.can_stats.bus_error++;
987 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
989 switch (ecc & ECC_MASK) {
991 cf->data[2] |= CAN_ERR_PROT_BIT;
994 cf->data[2] |= CAN_ERR_PROT_FORM;
997 cf->data[2] |= CAN_ERR_PROT_STUFF;
1000 cf->data[2] |= CAN_ERR_PROT_UNSPEC;
1001 cf->data[3] = ecc & ECC_SEG;
1005 if ((ecc & ECC_DIR) == 0)
1006 cf->data[2] |= CAN_ERR_PROT_TX;
1008 cf->data[6] = txerr;
1009 cf->data[7] = rxerr;
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;
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;
1027 cf->data[6] = txerr;
1028 cf->data[7] = rxerr;
1031 mod->can.state = state;
1033 stats->rx_bytes += cf->can_dlc;
1038 static void ican3_handle_inquiry(struct ican3_dev *mod, struct ican3_msg *msg)
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);
1047 case INQUIRY_TERMINATION:
1048 mod->termination_enabled = msg->data[6] & HWCONF_TERMINATE_ON;
1049 complete(&mod->termination_comp);
1052 dev_err(mod->dev, "recieved an unknown inquiry response\n");
1057 static void ican3_handle_unknown_message(struct ican3_dev *mod,
1058 struct ican3_msg *msg)
1060 dev_warn(mod->dev, "recieved unknown message: spec 0x%.2x length %d\n",
1061 msg->spec, le16_to_cpu(msg->len));
1065 * Handle a control message from the firmware
1067 static void ican3_handle_message(struct ican3_dev *mod, struct ican3_msg *msg)
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));
1072 switch (msg->spec) {
1074 ican3_handle_idvers(mod, msg);
1078 ican3_handle_msglost(mod, msg);
1081 ican3_handle_cevtind(mod, msg);
1084 ican3_handle_inquiry(mod, msg);
1087 ican3_handle_unknown_message(mod, msg);
1093 * Check that there is room in the TX ring to transmit another skb
1095 * LOCKING: must hold mod->lock
1097 static bool ican3_txok(struct ican3_dev *mod)
1099 struct ican3_fast_desc __iomem *desc;
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);
1107 /* if the control bits are not valid, then we have no more space */
1108 if (!(control & DESC_VALID))
1115 * Recieve one CAN frame from the hardware
1117 * CONTEXT: must be called from user context
1119 static int ican3_recv_skb(struct ican3_dev *mod)
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;
1129 spin_lock_irqsave(&mod->lock, flags);
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));
1136 spin_unlock_irqrestore(&mod->lock, flags);
1138 /* check that we actually have a CAN frame */
1139 if (!(desc.control & DESC_VALID))
1142 /* allocate an skb */
1143 skb = alloc_can_skb(ndev, &cf);
1144 if (unlikely(skb == NULL)) {
1145 stats->rx_dropped++;
1149 /* convert the ICAN3 frame into Linux CAN format */
1150 ican3_to_can_frame(mod, &desc, cf);
1152 /* receive the skb, update statistics */
1153 netif_receive_skb(skb);
1154 stats->rx_packets++;
1155 stats->rx_bytes += cf->can_dlc;
1158 /* toggle the valid bit and return the descriptor to the ring */
1159 desc.control ^= DESC_VALID;
1161 spin_lock_irqsave(&mod->lock, flags);
1163 ican3_set_page(mod, mod->fastrx_start + (mod->fastrx_num / 16));
1164 memcpy_toio(desc_addr, &desc, 1);
1166 /* update the next buffer pointer */
1167 mod->fastrx_num = (desc.control & DESC_WRAP) ? 0
1168 : (mod->fastrx_num + 1);
1170 /* there are still more buffers to process */
1171 spin_unlock_irqrestore(&mod->lock, flags);
1175 static int ican3_napi(struct napi_struct *napi, int budget)
1177 struct ican3_dev *mod = container_of(napi, struct ican3_dev, napi);
1178 struct ican3_msg msg;
1179 unsigned long flags;
1183 /* process all communication messages */
1185 ret = ican3_recv_msg(mod, &msg);
1189 ican3_handle_message(mod, &msg);
1192 /* process all CAN frames from the fast interface */
1193 while (received < budget) {
1194 ret = ican3_recv_skb(mod);
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);
1206 spin_lock_irqsave(&mod->lock, flags);
1208 /* Wake up the transmit queue if necessary */
1209 if (netif_queue_stopped(mod->ndev) && ican3_txok(mod))
1210 netif_wake_queue(mod->ndev);
1212 spin_unlock_irqrestore(&mod->lock, flags);
1214 /* re-enable interrupt generation */
1215 iowrite8(1 << mod->num, &mod->ctrl->int_enable);
1219 static irqreturn_t ican3_irq(int irq, void *dev_id)
1221 struct ican3_dev *mod = dev_id;
1225 * The interrupt status register on this device reports interrupts
1226 * as zeroes instead of using ones like most other devices
1228 stat = ioread8(&mod->ctrl->int_disable) & (1 << mod->num);
1229 if (stat == (1 << mod->num))
1232 /* clear the MODULbus interrupt from the microcontroller */
1233 ioread8(&mod->dpmctrl->interrupt);
1235 /* disable interrupt generation, schedule the NAPI poller */
1236 iowrite8(1 << mod->num, &mod->ctrl->int_disable);
1237 napi_schedule(&mod->napi);
1242 * Firmware reset, startup, and shutdown
1246 * Reset an ICAN module to its power-on state
1248 * CONTEXT: no network device registered
1250 static int ican3_reset_module(struct ican3_dev *mod)
1252 u8 val = 1 << mod->num;
1253 unsigned long start;
1256 /* disable interrupts so no more work is scheduled */
1257 iowrite8(1 << mod->num, &mod->ctrl->int_disable);
1259 /* the first unallocated page in the DPM is #9 */
1260 mod->free_page = DPM_FREE_START;
1262 ican3_set_page(mod, QUEUE_OLD_CONTROL);
1263 runold = ioread8(mod->dpm + TARGET_RUNNING);
1265 /* reset the module */
1266 iowrite8(val, &mod->ctrl->reset_assert);
1267 iowrite8(val, &mod->ctrl->reset_deassert);
1269 /* wait until the module has finished resetting and is running */
1272 ican3_set_page(mod, QUEUE_OLD_CONTROL);
1273 runnew = ioread8(mod->dpm + TARGET_RUNNING);
1274 if (runnew == (runold ^ 0xff))
1278 } while (time_before(jiffies, start + HZ / 4));
1280 dev_err(mod->dev, "failed to reset CAN module\n");
1284 static void __devexit ican3_shutdown_module(struct ican3_dev *mod)
1286 ican3_msg_disconnect(mod);
1287 ican3_reset_module(mod);
1291 * Startup an ICAN module, bringing it into fast mode
1293 static int __devinit ican3_startup_module(struct ican3_dev *mod)
1297 ret = ican3_reset_module(mod);
1299 dev_err(mod->dev, "unable to reset module\n");
1303 /* re-enable interrupts so we can send messages */
1304 iowrite8(1 << mod->num, &mod->ctrl->int_enable);
1306 ret = ican3_msg_connect(mod);
1308 dev_err(mod->dev, "unable to connect to module\n");
1312 ican3_init_new_host_interface(mod);
1313 ret = ican3_msg_newhostif(mod);
1315 dev_err(mod->dev, "unable to switch to new-style interface\n");
1319 /* default to "termination on" */
1320 ret = ican3_set_termination(mod, true);
1322 dev_err(mod->dev, "unable to enable termination\n");
1326 /* default to "bus errors enabled" */
1327 ret = ican3_set_buserror(mod, ICAN3_BUSERR_QUOTA_MAX);
1329 dev_err(mod->dev, "unable to set bus-error\n");
1333 ican3_init_fast_host_interface(mod);
1334 ret = ican3_msg_fasthostif(mod);
1336 dev_err(mod->dev, "unable to switch to fast host interface\n");
1340 ret = ican3_set_id_filter(mod, true);
1342 dev_err(mod->dev, "unable to set acceptance filter\n");
1350 * CAN Network Device
1353 static int ican3_open(struct net_device *ndev)
1355 struct ican3_dev *mod = netdev_priv(ndev);
1359 /* open the CAN layer */
1360 ret = open_candev(ndev);
1362 dev_err(mod->dev, "unable to start CAN layer\n");
1366 /* set the bus error generation state appropriately */
1367 if (mod->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
1368 quota = ICAN3_BUSERR_QUOTA_MAX;
1372 ret = ican3_set_buserror(mod, quota);
1374 dev_err(mod->dev, "unable to set bus-error\n");
1379 /* bring the bus online */
1380 ret = ican3_set_bus_state(mod, true);
1382 dev_err(mod->dev, "unable to set bus-on\n");
1387 /* start up the network device */
1388 mod->can.state = CAN_STATE_ERROR_ACTIVE;
1389 netif_start_queue(ndev);
1394 static int ican3_stop(struct net_device *ndev)
1396 struct ican3_dev *mod = netdev_priv(ndev);
1399 /* stop the network device xmit routine */
1400 netif_stop_queue(ndev);
1401 mod->can.state = CAN_STATE_STOPPED;
1403 /* bring the bus offline, stop receiving packets */
1404 ret = ican3_set_bus_state(mod, false);
1406 dev_err(mod->dev, "unable to set bus-off\n");
1410 /* close the CAN layer */
1415 static int ican3_xmit(struct sk_buff *skb, struct net_device *ndev)
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;
1424 spin_lock_irqsave(&mod->lock, flags);
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;
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);
1440 /* convert the Linux CAN frame into ICAN3 format */
1441 can_frame_to_ican3(mod, cf, &desc);
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
1448 desc.control |= DESC_IVALID;
1449 memcpy_toio(desc_addr, &desc, sizeof(desc));
1451 /* generate a MODULbus interrupt to the microcontroller */
1452 iowrite8(0x01, &mod->dpmctrl->interrupt);
1454 desc.control ^= DESC_VALID;
1455 memcpy_toio(desc_addr, &desc, sizeof(desc));
1457 /* update the next buffer pointer */
1458 mod->fasttx_num = (desc.control & DESC_WRAP) ? 0
1459 : (mod->fasttx_num + 1);
1461 /* update statistics */
1462 stats->tx_packets++;
1463 stats->tx_bytes += cf->can_dlc;
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.
1473 /* copy the control bits of the descriptor */
1474 if (!ican3_txok(mod))
1475 netif_stop_queue(ndev);
1477 spin_unlock_irqrestore(&mod->lock, flags);
1478 return NETDEV_TX_OK;
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,
1488 * Low-level CAN Device
1491 /* This structure was stolen from drivers/net/can/sja1000/sja1000.c */
1492 static struct can_bittiming_const ican3_bittiming_const = {
1505 * This routine was stolen from drivers/net/can/sja1000/sja1000.c
1507 * The bittiming register command for the ICAN3 just sets the bit timing
1508 * registers on the SJA1000 chip directly
1510 static int ican3_set_bittiming(struct net_device *ndev)
1512 struct ican3_dev *mod = netdev_priv(ndev);
1513 struct can_bittiming *bt = &mod->can.bittiming;
1514 struct ican3_msg msg;
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)
1523 memset(&msg, 0, sizeof(msg));
1524 msg.spec = MSG_CBTRREQ;
1525 msg.len = cpu_to_le16(4);
1531 return ican3_send_msg(mod, &msg);
1534 static int ican3_set_mode(struct net_device *ndev, enum can_mode mode)
1536 struct ican3_dev *mod = netdev_priv(ndev);
1539 if (mode != CAN_MODE_START)
1542 /* bring the bus online */
1543 ret = ican3_set_bus_state(mod, true);
1545 dev_err(mod->dev, "unable to set bus-on\n");
1549 /* start up the network device */
1550 mod->can.state = CAN_STATE_ERROR_ACTIVE;
1552 if (netif_queue_stopped(ndev))
1553 netif_wake_queue(ndev);
1558 static int ican3_get_berr_counter(const struct net_device *ndev,
1559 struct can_berr_counter *bec)
1561 struct ican3_dev *mod = netdev_priv(ndev);
1564 ret = ican3_send_inquiry(mod, INQUIRY_STATUS);
1568 ret = wait_for_completion_timeout(&mod->buserror_comp, HZ);
1570 dev_info(mod->dev, "%s timed out\n", __func__);
1574 bec->rxerr = mod->bec.rxerr;
1575 bec->txerr = mod->bec.txerr;
1583 static ssize_t ican3_sysfs_show_term(struct device *dev,
1584 struct device_attribute *attr,
1587 struct ican3_dev *mod = netdev_priv(to_net_dev(dev));
1590 ret = ican3_send_inquiry(mod, INQUIRY_TERMINATION);
1594 ret = wait_for_completion_timeout(&mod->termination_comp, HZ);
1596 dev_info(mod->dev, "%s timed out\n", __func__);
1600 return snprintf(buf, PAGE_SIZE, "%u\n", mod->termination_enabled);
1603 static ssize_t ican3_sysfs_set_term(struct device *dev,
1604 struct device_attribute *attr,
1605 const char *buf, size_t count)
1607 struct ican3_dev *mod = netdev_priv(to_net_dev(dev));
1608 unsigned long enable;
1611 if (strict_strtoul(buf, 0, &enable))
1614 ret = ican3_set_termination(mod, enable);
1621 static DEVICE_ATTR(termination, S_IWUGO | S_IRUGO, ican3_sysfs_show_term,
1622 ican3_sysfs_set_term);
1624 static struct attribute *ican3_sysfs_attrs[] = {
1625 &dev_attr_termination.attr,
1629 static struct attribute_group ican3_sysfs_attr_group = {
1630 .attrs = ican3_sysfs_attrs,
1637 static int __devinit ican3_probe(struct platform_device *pdev)
1639 struct janz_platform_data *pdata;
1640 struct net_device *ndev;
1641 struct ican3_dev *mod;
1642 struct resource *res;
1646 pdata = pdev->dev.platform_data;
1650 dev_dbg(&pdev->dev, "probe: module number %d\n", pdata->modno);
1652 /* save the struct device for printing */
1655 /* allocate the CAN device and private data */
1656 ndev = alloc_candev(sizeof(*mod), 0);
1658 dev_err(dev, "unable to allocate CANdev\n");
1663 platform_set_drvdata(pdev, ndev);
1664 mod = netdev_priv(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);
1673 /* setup device-specific sysfs attributes */
1674 ndev->sysfs_groups[0] = &ican3_sysfs_attr_group;
1676 /* the first unallocated page in the DPM is 9 */
1677 mod->free_page = DPM_FREE_START;
1679 ndev->netdev_ops = &ican3_netdev_ops;
1680 ndev->flags |= IFF_ECHO;
1681 SET_NETDEV_DEV(ndev, &pdev->dev);
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;
1691 /* find our IRQ number */
1692 mod->irq = platform_get_irq(pdev, 0);
1694 dev_err(dev, "IRQ line not found\n");
1699 ndev->irq = mod->irq;
1701 /* get access to the MODULbus registers for this module */
1702 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1704 dev_err(dev, "MODULbus registers not found\n");
1709 mod->dpm = ioremap(res->start, resource_size(res));
1711 dev_err(dev, "MODULbus registers not ioremap\n");
1716 mod->dpmctrl = mod->dpm + DPM_PAGE_SIZE;
1718 /* get access to the control registers for this module */
1719 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1721 dev_err(dev, "CONTROL registers not found\n");
1723 goto out_iounmap_dpm;
1726 mod->ctrl = ioremap(res->start, resource_size(res));
1728 dev_err(dev, "CONTROL registers not ioremap\n");
1730 goto out_iounmap_dpm;
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);
1737 dev_err(dev, "unable to request IRQ\n");
1738 goto out_iounmap_ctrl;
1741 /* reset and initialize the CAN controller into fast mode */
1742 napi_enable(&mod->napi);
1743 ret = ican3_startup_module(mod);
1745 dev_err(dev, "%s: unable to start CANdev\n", __func__);
1749 /* register with the Linux CAN layer */
1750 ret = register_candev(ndev);
1752 dev_err(dev, "%s: unable to register CANdev\n", __func__);
1756 dev_info(dev, "module %d: registered CAN device\n", pdata->modno);
1760 napi_disable(&mod->napi);
1761 iowrite8(1 << mod->num, &mod->ctrl->int_disable);
1762 free_irq(mod->irq, mod);
1773 static int __devexit ican3_remove(struct platform_device *pdev)
1775 struct net_device *ndev = platform_get_drvdata(pdev);
1776 struct ican3_dev *mod = netdev_priv(ndev);
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);
1784 /* put the module into reset */
1785 ican3_shutdown_module(mod);
1787 /* unmap all registers */
1796 static struct platform_driver ican3_driver = {
1799 .owner = THIS_MODULE,
1801 .probe = ican3_probe,
1802 .remove = __devexit_p(ican3_remove),
1805 static int __init ican3_init(void)
1807 return platform_driver_register(&ican3_driver);
1810 static void __exit ican3_exit(void)
1812 platform_driver_unregister(&ican3_driver);
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");
1820 module_init(ican3_init);
1821 module_exit(ican3_exit);