1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (C) 2008-2010
  4 *
  5 * - Kurt Van Dijck, EIA Electronics
  6 */
  7
  8#include <linux/ethtool.h>
  9#include <linux/module.h>
 10#include <linux/interrupt.h>
 11#include <asm/io.h>
 12
 13#include "softing.h"
 14
 15#define TX_ECHO_SKB_MAX (((TXMAX+1)/2)-1)
 16
 17/*
 18 * test is a specific CAN netdev
 19 * is online (ie. up 'n running, not sleeping, not busoff
 20 */
 21static inline int canif_is_active(struct net_device *netdev)
 22{
 23	struct can_priv *can = netdev_priv(netdev);
 24
 25	if (!netif_running(netdev))
 26		return 0;
 27	return (can->state <= CAN_STATE_ERROR_PASSIVE);
 28}
 29
 30/* reset DPRAM */
 31static inline void softing_set_reset_dpram(struct softing *card)
 32{
 33	if (card->pdat->generation >= 2) {
 34		spin_lock_bh(&card->spin);
 35		iowrite8(ioread8(&card->dpram[DPRAM_V2_RESET]) & ~1,
 36				&card->dpram[DPRAM_V2_RESET]);
 37		spin_unlock_bh(&card->spin);
 38	}
 39}
 40
 41static inline void softing_clr_reset_dpram(struct softing *card)
 42{
 43	if (card->pdat->generation >= 2) {
 44		spin_lock_bh(&card->spin);
 45		iowrite8(ioread8(&card->dpram[DPRAM_V2_RESET]) | 1,
 46				&card->dpram[DPRAM_V2_RESET]);
 47		spin_unlock_bh(&card->spin);
 48	}
 49}
 50
 51/* trigger the tx queue-ing */
 52static netdev_tx_t softing_netdev_start_xmit(struct sk_buff *skb,
 53		struct net_device *dev)
 54{
 55	struct softing_priv *priv = netdev_priv(dev);
 56	struct softing *card = priv->card;
 57	int ret;
 58	uint8_t *ptr;
 59	uint8_t fifo_wr, fifo_rd;
 60	struct can_frame *cf = (struct can_frame *)skb->data;
 61	uint8_t buf[DPRAM_TX_SIZE];
 62
 63	if (can_dev_dropped_skb(dev, skb))
 64		return NETDEV_TX_OK;
 65
 66	spin_lock(&card->spin);
 67
 68	ret = NETDEV_TX_BUSY;
 69	if (!card->fw.up ||
 70			(card->tx.pending >= TXMAX) ||
 71			(priv->tx.pending >= TX_ECHO_SKB_MAX))
 72		goto xmit_done;
 73	fifo_wr = ioread8(&card->dpram[DPRAM_TX_WR]);
 74	fifo_rd = ioread8(&card->dpram[DPRAM_TX_RD]);
 75	if (fifo_wr == fifo_rd)
 76		/* fifo full */
 77		goto xmit_done;
 78	memset(buf, 0, sizeof(buf));
 79	ptr = buf;
 80	*ptr = CMD_TX;
 81	if (cf->can_id & CAN_RTR_FLAG)
 82		*ptr |= CMD_RTR;
 83	if (cf->can_id & CAN_EFF_FLAG)
 84		*ptr |= CMD_XTD;
 85	if (priv->index)
 86		*ptr |= CMD_BUS2;
 87	++ptr;
 88	*ptr++ = cf->len;
 89	*ptr++ = (cf->can_id >> 0);
 90	*ptr++ = (cf->can_id >> 8);
 91	if (cf->can_id & CAN_EFF_FLAG) {
 92		*ptr++ = (cf->can_id >> 16);
 93		*ptr++ = (cf->can_id >> 24);
 94	} else {
 95		/* increment 1, not 2 as you might think */
 96		ptr += 1;
 97	}
 98	if (!(cf->can_id & CAN_RTR_FLAG))
 99		memcpy(ptr, &cf->data[0], cf->len);
100	memcpy_toio(&card->dpram[DPRAM_TX + DPRAM_TX_SIZE * fifo_wr],
101			buf, DPRAM_TX_SIZE);
102	if (++fifo_wr >= DPRAM_TX_CNT)
103		fifo_wr = 0;
104	iowrite8(fifo_wr, &card->dpram[DPRAM_TX_WR]);
105	card->tx.last_bus = priv->index;
106	++card->tx.pending;
107	++priv->tx.pending;
108	can_put_echo_skb(skb, dev, priv->tx.echo_put, 0);
109	++priv->tx.echo_put;
110	if (priv->tx.echo_put >= TX_ECHO_SKB_MAX)
111		priv->tx.echo_put = 0;
112	/* can_put_echo_skb() saves the skb, safe to return TX_OK */
113	ret = NETDEV_TX_OK;
114xmit_done:
115	spin_unlock(&card->spin);
116	if (card->tx.pending >= TXMAX) {
117		int j;
118		for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
119			if (card->net[j])
120				netif_stop_queue(card->net[j]);
121		}
122	}
123	if (ret != NETDEV_TX_OK)
124		netif_stop_queue(dev);
125
126	return ret;
127}
128
129/*
130 * shortcut for skb delivery
131 */
132int softing_netdev_rx(struct net_device *netdev, const struct can_frame *msg,
133		ktime_t ktime)
134{
135	struct sk_buff *skb;
136	struct can_frame *cf;
137
138	skb = alloc_can_skb(netdev, &cf);
139	if (!skb)
140		return -ENOMEM;
141	memcpy(cf, msg, sizeof(*msg));
142	skb->tstamp = ktime;
143	return netif_rx(skb);
144}
145
146/*
147 * softing_handle_1
148 * pop 1 entry from the DPRAM queue, and process
149 */
150static int softing_handle_1(struct softing *card)
151{
152	struct net_device *netdev;
153	struct softing_priv *priv;
154	ktime_t ktime;
155	struct can_frame msg;
156	int cnt = 0, lost_msg;
157	uint8_t fifo_rd, fifo_wr, cmd;
158	uint8_t *ptr;
159	uint32_t tmp_u32;
160	uint8_t buf[DPRAM_RX_SIZE];
161
162	memset(&msg, 0, sizeof(msg));
163	/* test for lost msgs */
164	lost_msg = ioread8(&card->dpram[DPRAM_RX_LOST]);
165	if (lost_msg) {
166		int j;
167		/* reset condition */
168		iowrite8(0, &card->dpram[DPRAM_RX_LOST]);
169		/* prepare msg */
170		msg.can_id = CAN_ERR_FLAG | CAN_ERR_CRTL;
171		msg.len = CAN_ERR_DLC;
172		msg.data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
173		/*
174		 * service to all buses, we don't know which it was applicable
175		 * but only service buses that are online
176		 */
177		for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
178			netdev = card->net[j];
179			if (!netdev)
180				continue;
181			if (!canif_is_active(netdev))
182				/* a dead bus has no overflows */
183				continue;
184			++netdev->stats.rx_over_errors;
185			softing_netdev_rx(netdev, &msg, 0);
186		}
187		/* prepare for other use */
188		memset(&msg, 0, sizeof(msg));
189		++cnt;
190	}
191
192	fifo_rd = ioread8(&card->dpram[DPRAM_RX_RD]);
193	fifo_wr = ioread8(&card->dpram[DPRAM_RX_WR]);
194
195	if (++fifo_rd >= DPRAM_RX_CNT)
196		fifo_rd = 0;
197	if (fifo_wr == fifo_rd)
198		return cnt;
199
200	memcpy_fromio(buf, &card->dpram[DPRAM_RX + DPRAM_RX_SIZE*fifo_rd],
201			DPRAM_RX_SIZE);
202	mb();
203	/* trigger dual port RAM */
204	iowrite8(fifo_rd, &card->dpram[DPRAM_RX_RD]);
205
206	ptr = buf;
207	cmd = *ptr++;
208	if (cmd == 0xff)
209		/* not quite useful, probably the card has got out */
210		return 0;
211	netdev = card->net[0];
212	if (cmd & CMD_BUS2)
213		netdev = card->net[1];
214	priv = netdev_priv(netdev);
215
216	if (cmd & CMD_ERR) {
217		uint8_t can_state, state;
218
219		state = *ptr++;
220
221		msg.can_id = CAN_ERR_FLAG;
222		msg.len = CAN_ERR_DLC;
223
224		if (state & SF_MASK_BUSOFF) {
225			can_state = CAN_STATE_BUS_OFF;
226			msg.can_id |= CAN_ERR_BUSOFF;
227			state = STATE_BUSOFF;
228		} else if (state & SF_MASK_EPASSIVE) {
229			can_state = CAN_STATE_ERROR_PASSIVE;
230			msg.can_id |= CAN_ERR_CRTL;
231			msg.data[1] = CAN_ERR_CRTL_TX_PASSIVE;
232			state = STATE_EPASSIVE;
233		} else {
234			can_state = CAN_STATE_ERROR_ACTIVE;
235			msg.can_id |= CAN_ERR_CRTL;
236			state = STATE_EACTIVE;
237		}
238		/* update DPRAM */
239		iowrite8(state, &card->dpram[priv->index ?
240				DPRAM_INFO_BUSSTATE2 : DPRAM_INFO_BUSSTATE]);
241		/* timestamp */
242		tmp_u32 = le32_to_cpup((void *)ptr);
243		ktime = softing_raw2ktime(card, tmp_u32);
244
245		++netdev->stats.rx_errors;
246		/* update internal status */
247		if (can_state != priv->can.state) {
248			priv->can.state = can_state;
249			if (can_state == CAN_STATE_ERROR_PASSIVE)
250				++priv->can.can_stats.error_passive;
251			else if (can_state == CAN_STATE_BUS_OFF) {
252				/* this calls can_close_cleanup() */
253				++priv->can.can_stats.bus_off;
254				can_bus_off(netdev);
255				netif_stop_queue(netdev);
256			}
257			/* trigger socketcan */
258			softing_netdev_rx(netdev, &msg, ktime);
259		}
260
261	} else {
262		if (cmd & CMD_RTR)
263			msg.can_id |= CAN_RTR_FLAG;
264		msg.len = can_cc_dlc2len(*ptr++);
265		if (cmd & CMD_XTD) {
266			msg.can_id |= CAN_EFF_FLAG;
267			msg.can_id |= le32_to_cpup((void *)ptr);
268			ptr += 4;
269		} else {
270			msg.can_id |= le16_to_cpup((void *)ptr);
271			ptr += 2;
272		}
273		/* timestamp */
274		tmp_u32 = le32_to_cpup((void *)ptr);
275		ptr += 4;
276		ktime = softing_raw2ktime(card, tmp_u32);
277		if (!(msg.can_id & CAN_RTR_FLAG))
278			memcpy(&msg.data[0], ptr, 8);
279		/* update socket */
280		if (cmd & CMD_ACK) {
281			/* acknowledge, was tx msg */
282			struct sk_buff *skb;
283			skb = priv->can.echo_skb[priv->tx.echo_get];
284			if (skb)
285				skb->tstamp = ktime;
286			++netdev->stats.tx_packets;
287			netdev->stats.tx_bytes +=
288				can_get_echo_skb(netdev, priv->tx.echo_get,
289						 NULL);
290			++priv->tx.echo_get;
291			if (priv->tx.echo_get >= TX_ECHO_SKB_MAX)
292				priv->tx.echo_get = 0;
293			if (priv->tx.pending)
294				--priv->tx.pending;
295			if (card->tx.pending)
296				--card->tx.pending;
297		} else {
298			int ret;
299
300			ret = softing_netdev_rx(netdev, &msg, ktime);
301			if (ret == NET_RX_SUCCESS) {
302				++netdev->stats.rx_packets;
303				if (!(msg.can_id & CAN_RTR_FLAG))
304					netdev->stats.rx_bytes += msg.len;
305			} else {
306				++netdev->stats.rx_dropped;
307			}
308		}
309	}
310	++cnt;
311	return cnt;
312}
313
314/*
315 * real interrupt handler
316 */
317static irqreturn_t softing_irq_thread(int irq, void *dev_id)
318{
319	struct softing *card = (struct softing *)dev_id;
320	struct net_device *netdev;
321	struct softing_priv *priv;
322	int j, offset, work_done;
323
324	work_done = 0;
325	spin_lock_bh(&card->spin);
326	while (softing_handle_1(card) > 0) {
327		++card->irq.svc_count;
328		++work_done;
329	}
330	spin_unlock_bh(&card->spin);
331	/* resume tx queue's */
332	offset = card->tx.last_bus;
333	for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
334		if (card->tx.pending >= TXMAX)
335			break;
336		netdev = card->net[(j + offset + 1) % card->pdat->nbus];
337		if (!netdev)
338			continue;
339		priv = netdev_priv(netdev);
340		if (!canif_is_active(netdev))
341			/* it makes no sense to wake dead buses */
342			continue;
343		if (priv->tx.pending >= TX_ECHO_SKB_MAX)
344			continue;
345		++work_done;
346		netif_wake_queue(netdev);
347	}
348	return work_done ? IRQ_HANDLED : IRQ_NONE;
349}
350
351/*
352 * interrupt routines:
353 * schedule the 'real interrupt handler'
354 */
355static irqreturn_t softing_irq_v2(int irq, void *dev_id)
356{
357	struct softing *card = (struct softing *)dev_id;
358	uint8_t ir;
359
360	ir = ioread8(&card->dpram[DPRAM_V2_IRQ_TOHOST]);
361	iowrite8(0, &card->dpram[DPRAM_V2_IRQ_TOHOST]);
362	return (1 == ir) ? IRQ_WAKE_THREAD : IRQ_NONE;
363}
364
365static irqreturn_t softing_irq_v1(int irq, void *dev_id)
366{
367	struct softing *card = (struct softing *)dev_id;
368	uint8_t ir;
369
370	ir = ioread8(&card->dpram[DPRAM_IRQ_TOHOST]);
371	iowrite8(0, &card->dpram[DPRAM_IRQ_TOHOST]);
372	return ir ? IRQ_WAKE_THREAD : IRQ_NONE;
373}
374
375/*
376 * netdev/candev interoperability
377 */
378static int softing_netdev_open(struct net_device *ndev)
379{
380	int ret;
381
382	/* check or determine and set bittime */
383	ret = open_candev(ndev);
384	if (ret)
385		return ret;
386
387	ret = softing_startstop(ndev, 1);
388	if (ret < 0)
389		close_candev(ndev);
390
391	return ret;
392}
393
394static int softing_netdev_stop(struct net_device *ndev)
395{
396	netif_stop_queue(ndev);
397
398	/* softing cycle does close_candev() */
399	return softing_startstop(ndev, 0);
400}
401
402static int softing_candev_set_mode(struct net_device *ndev, enum can_mode mode)
403{
404	int ret;
405
406	switch (mode) {
407	case CAN_MODE_START:
408		/* softing_startstop does close_candev() */
409		ret = softing_startstop(ndev, 1);
410		return ret;
411	case CAN_MODE_STOP:
412	case CAN_MODE_SLEEP:
413		return -EOPNOTSUPP;
414	}
415	return 0;
416}
417
418/*
419 * Softing device management helpers
420 */
421int softing_enable_irq(struct softing *card, int enable)
422{
423	int ret;
424
425	if (!card->irq.nr) {
426		return 0;
427	} else if (card->irq.requested && !enable) {
428		free_irq(card->irq.nr, card);
429		card->irq.requested = 0;
430	} else if (!card->irq.requested && enable) {
431		ret = request_threaded_irq(card->irq.nr,
432				(card->pdat->generation >= 2) ?
433					softing_irq_v2 : softing_irq_v1,
434				softing_irq_thread, IRQF_SHARED,
435				dev_name(&card->pdev->dev), card);
436		if (ret) {
437			dev_alert(&card->pdev->dev,
438					"request_threaded_irq(%u) failed\n",
439					card->irq.nr);
440			return ret;
441		}
442		card->irq.requested = 1;
443	}
444	return 0;
445}
446
447static void softing_card_shutdown(struct softing *card)
448{
449	int fw_up = 0;
450
451	if (mutex_lock_interruptible(&card->fw.lock)) {
452		/* return -ERESTARTSYS */;
453	}
454	fw_up = card->fw.up;
455	card->fw.up = 0;
456
457	if (card->irq.requested && card->irq.nr) {
458		free_irq(card->irq.nr, card);
459		card->irq.requested = 0;
460	}
461	if (fw_up) {
462		if (card->pdat->enable_irq)
463			card->pdat->enable_irq(card->pdev, 0);
464		softing_set_reset_dpram(card);
465		if (card->pdat->reset)
466			card->pdat->reset(card->pdev, 1);
467	}
468	mutex_unlock(&card->fw.lock);
469}
470
471static int softing_card_boot(struct softing *card)
472{
473	int ret, j;
474	static const uint8_t stream[] = {
475		0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, };
476	unsigned char back[sizeof(stream)];
477
478	if (mutex_lock_interruptible(&card->fw.lock))
479		return -ERESTARTSYS;
480	if (card->fw.up) {
481		mutex_unlock(&card->fw.lock);
482		return 0;
483	}
484	/* reset board */
485	if (card->pdat->enable_irq)
486		card->pdat->enable_irq(card->pdev, 1);
487	/* boot card */
488	softing_set_reset_dpram(card);
489	if (card->pdat->reset)
490		card->pdat->reset(card->pdev, 1);
491	for (j = 0; (j + sizeof(stream)) < card->dpram_size;
492			j += sizeof(stream)) {
493
494		memcpy_toio(&card->dpram[j], stream, sizeof(stream));
495		/* flush IO cache */
496		mb();
497		memcpy_fromio(back, &card->dpram[j], sizeof(stream));
498
499		if (!memcmp(back, stream, sizeof(stream)))
500			continue;
501		/* memory is not equal */
502		dev_alert(&card->pdev->dev, "dpram failed at 0x%04x\n", j);
503		ret = -EIO;
504		goto failed;
505	}
506	wmb();
507	/* load boot firmware */
508	ret = softing_load_fw(card->pdat->boot.fw, card, card->dpram,
509				card->dpram_size,
510				card->pdat->boot.offs - card->pdat->boot.addr);
511	if (ret < 0)
512		goto failed;
513	/* load loader firmware */
514	ret = softing_load_fw(card->pdat->load.fw, card, card->dpram,
515				card->dpram_size,
516				card->pdat->load.offs - card->pdat->load.addr);
517	if (ret < 0)
518		goto failed;
519
520	if (card->pdat->reset)
521		card->pdat->reset(card->pdev, 0);
522	softing_clr_reset_dpram(card);
523	ret = softing_bootloader_command(card, 0, "card boot");
524	if (ret < 0)
525		goto failed;
526	ret = softing_load_app_fw(card->pdat->app.fw, card);
527	if (ret < 0)
528		goto failed;
529
530	ret = softing_chip_poweron(card);
531	if (ret < 0)
532		goto failed;
533
534	card->fw.up = 1;
535	mutex_unlock(&card->fw.lock);
536	return 0;
537failed:
538	card->fw.up = 0;
539	if (card->pdat->enable_irq)
540		card->pdat->enable_irq(card->pdev, 0);
541	softing_set_reset_dpram(card);
542	if (card->pdat->reset)
543		card->pdat->reset(card->pdev, 1);
544	mutex_unlock(&card->fw.lock);
545	return ret;
546}
547
548/*
549 * netdev sysfs
550 */
551static ssize_t show_chip(struct device *dev, struct device_attribute *attr,
552		char *buf)
553{
554	struct net_device *ndev = to_net_dev(dev);
555	struct softing_priv *priv = netdev2softing(ndev);
556
557	return sprintf(buf, "%i\n", priv->chip);
558}
559
560static ssize_t show_output(struct device *dev, struct device_attribute *attr,
561		char *buf)
562{
563	struct net_device *ndev = to_net_dev(dev);
564	struct softing_priv *priv = netdev2softing(ndev);
565
566	return sprintf(buf, "0x%02x\n", priv->output);
567}
568
569static ssize_t store_output(struct device *dev, struct device_attribute *attr,
570		const char *buf, size_t count)
571{
572	struct net_device *ndev = to_net_dev(dev);
573	struct softing_priv *priv = netdev2softing(ndev);
574	struct softing *card = priv->card;
575	unsigned long val;
576	int ret;
577
578	ret = kstrtoul(buf, 0, &val);
579	if (ret < 0)
580		return ret;
581	val &= 0xFF;
582
583	ret = mutex_lock_interruptible(&card->fw.lock);
584	if (ret)
585		return -ERESTARTSYS;
586	if (netif_running(ndev)) {
587		mutex_unlock(&card->fw.lock);
588		return -EBUSY;
589	}
590	priv->output = val;
591	mutex_unlock(&card->fw.lock);
592	return count;
593}
594
595static const DEVICE_ATTR(chip, 0444, show_chip, NULL);
596static const DEVICE_ATTR(output, 0644, show_output, store_output);
597
598static const struct attribute *const netdev_sysfs_attrs[] = {
599	&dev_attr_chip.attr,
600	&dev_attr_output.attr,
601	NULL,
602};
603static const struct attribute_group netdev_sysfs_group = {
604	.name = NULL,
605	.attrs = (struct attribute **)netdev_sysfs_attrs,
606};
607
608static const struct net_device_ops softing_netdev_ops = {
609	.ndo_open = softing_netdev_open,
610	.ndo_stop = softing_netdev_stop,
611	.ndo_start_xmit	= softing_netdev_start_xmit,
612	.ndo_change_mtu = can_change_mtu,
613};
614
615static const struct ethtool_ops softing_ethtool_ops = {
616	.get_ts_info = ethtool_op_get_ts_info,
617};
618
619static const struct can_bittiming_const softing_btr_const = {
620	.name = KBUILD_MODNAME,
621	.tseg1_min = 1,
622	.tseg1_max = 16,
623	.tseg2_min = 1,
624	.tseg2_max = 8,
625	.sjw_max = 4, /* overruled */
626	.brp_min = 1,
627	.brp_max = 32, /* overruled */
628	.brp_inc = 1,
629};
630
631
632static struct net_device *softing_netdev_create(struct softing *card,
633						uint16_t chip_id)
634{
635	struct net_device *netdev;
636	struct softing_priv *priv;
637
638	netdev = alloc_candev(sizeof(*priv), TX_ECHO_SKB_MAX);
639	if (!netdev) {
640		dev_alert(&card->pdev->dev, "alloc_candev failed\n");
641		return NULL;
642	}
643	priv = netdev_priv(netdev);
644	priv->netdev = netdev;
645	priv->card = card;
646	memcpy(&priv->btr_const, &softing_btr_const, sizeof(priv->btr_const));
647	priv->btr_const.brp_max = card->pdat->max_brp;
648	priv->btr_const.sjw_max = card->pdat->max_sjw;
649	priv->can.bittiming_const = &priv->btr_const;
650	priv->can.clock.freq = 8000000;
651	priv->chip = chip_id;
652	priv->output = softing_default_output(netdev);
653	SET_NETDEV_DEV(netdev, &card->pdev->dev);
654
655	netdev->flags |= IFF_ECHO;
656	netdev->netdev_ops = &softing_netdev_ops;
657	netdev->ethtool_ops = &softing_ethtool_ops;
658	priv->can.do_set_mode = softing_candev_set_mode;
659	priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
660
661	return netdev;
662}
663
664static int softing_netdev_register(struct net_device *netdev)
665{
666	int ret;
667
668	ret = register_candev(netdev);
669	if (ret) {
670		dev_alert(&netdev->dev, "register failed\n");
671		return ret;
672	}
673	if (sysfs_create_group(&netdev->dev.kobj, &netdev_sysfs_group) < 0)
674		netdev_alert(netdev, "sysfs group failed\n");
675
676	return 0;
677}
678
679static void softing_netdev_cleanup(struct net_device *netdev)
680{
681	sysfs_remove_group(&netdev->dev.kobj, &netdev_sysfs_group);
682	unregister_candev(netdev);
683	free_candev(netdev);
684}
685
686/*
687 * sysfs for Platform device
688 */
689#define DEV_ATTR_RO(name, member) \
690static ssize_t show_##name(struct device *dev, \
691		struct device_attribute *attr, char *buf) \
692{ \
693	struct softing *card = dev_get_drvdata(dev); \
694	return sprintf(buf, "%u\n", card->member); \
695} \
696static DEVICE_ATTR(name, 0444, show_##name, NULL)
697
698#define DEV_ATTR_RO_STR(name, member) \
699static ssize_t show_##name(struct device *dev, \
700		struct device_attribute *attr, char *buf) \
701{ \
702	struct softing *card = dev_get_drvdata(dev); \
703	return sprintf(buf, "%s\n", card->member); \
704} \
705static DEVICE_ATTR(name, 0444, show_##name, NULL)
706
707DEV_ATTR_RO(serial, id.serial);
708DEV_ATTR_RO_STR(firmware, pdat->app.fw);
709DEV_ATTR_RO(firmware_version, id.fw_version);
710DEV_ATTR_RO_STR(hardware, pdat->name);
711DEV_ATTR_RO(hardware_version, id.hw_version);
712DEV_ATTR_RO(license, id.license);
713
714static struct attribute *softing_pdev_attrs[] = {
715	&dev_attr_serial.attr,
716	&dev_attr_firmware.attr,
717	&dev_attr_firmware_version.attr,
718	&dev_attr_hardware.attr,
719	&dev_attr_hardware_version.attr,
720	&dev_attr_license.attr,
721	NULL,
722};
723
724static const struct attribute_group softing_pdev_group = {
725	.name = NULL,
726	.attrs = softing_pdev_attrs,
727};
728
729/*
730 * platform driver
731 */
732static void softing_pdev_remove(struct platform_device *pdev)
733{
734	struct softing *card = platform_get_drvdata(pdev);
735	int j;
736
737	/* first, disable card*/
738	softing_card_shutdown(card);
739
740	for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
741		if (!card->net[j])
742			continue;
743		softing_netdev_cleanup(card->net[j]);
744		card->net[j] = NULL;
745	}
746	sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group);
747
748	iounmap(card->dpram);
749	kfree(card);
 
750}
751
752static int softing_pdev_probe(struct platform_device *pdev)
753{
754	const struct softing_platform_data *pdat = dev_get_platdata(&pdev->dev);
755	struct softing *card;
756	struct net_device *netdev;
757	struct softing_priv *priv;
758	struct resource *pres;
759	int ret;
760	int j;
761
762	if (!pdat) {
763		dev_warn(&pdev->dev, "no platform data\n");
764		return -EINVAL;
765	}
766	if (pdat->nbus > ARRAY_SIZE(card->net)) {
767		dev_warn(&pdev->dev, "%u nets??\n", pdat->nbus);
768		return -EINVAL;
769	}
770
771	card = kzalloc(sizeof(*card), GFP_KERNEL);
772	if (!card)
773		return -ENOMEM;
774	card->pdat = pdat;
775	card->pdev = pdev;
776	platform_set_drvdata(pdev, card);
777	mutex_init(&card->fw.lock);
778	spin_lock_init(&card->spin);
779
780	ret = -EINVAL;
781	pres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
782	if (!pres)
783		goto platform_resource_failed;
784	card->dpram_phys = pres->start;
785	card->dpram_size = resource_size(pres);
786	card->dpram = ioremap(card->dpram_phys, card->dpram_size);
787	if (!card->dpram) {
788		dev_alert(&card->pdev->dev, "dpram ioremap failed\n");
789		goto ioremap_failed;
790	}
791
792	pres = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
793	if (pres)
794		card->irq.nr = pres->start;
795
796	/* reset card */
797	ret = softing_card_boot(card);
798	if (ret < 0) {
799		dev_alert(&pdev->dev, "failed to boot\n");
800		goto boot_failed;
801	}
802
803	/* only now, the chip's are known */
804	card->id.freq = card->pdat->freq;
805
806	ret = sysfs_create_group(&pdev->dev.kobj, &softing_pdev_group);
807	if (ret < 0) {
808		dev_alert(&card->pdev->dev, "sysfs failed\n");
809		goto sysfs_failed;
810	}
811
812	for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
813		card->net[j] = netdev =
814			softing_netdev_create(card, card->id.chip[j]);
815		if (!netdev) {
816			dev_alert(&pdev->dev, "failed to make can[%i]", j);
817			ret = -ENOMEM;
818			goto netdev_failed;
819		}
820		netdev->dev_id = j;
821		priv = netdev_priv(card->net[j]);
822		priv->index = j;
823		ret = softing_netdev_register(netdev);
824		if (ret) {
825			free_candev(netdev);
826			card->net[j] = NULL;
827			dev_alert(&card->pdev->dev,
828					"failed to register can[%i]\n", j);
829			goto netdev_failed;
830		}
831	}
832	dev_info(&card->pdev->dev, "%s ready.\n", card->pdat->name);
833	return 0;
834
835netdev_failed:
836	for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
837		if (!card->net[j])
838			continue;
839		softing_netdev_cleanup(card->net[j]);
840	}
841	sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group);
842sysfs_failed:
843	softing_card_shutdown(card);
844boot_failed:
845	iounmap(card->dpram);
846ioremap_failed:
847platform_resource_failed:
848	kfree(card);
849	return ret;
850}
851
852static struct platform_driver softing_driver = {
853	.driver = {
854		.name = KBUILD_MODNAME,
855	},
856	.probe = softing_pdev_probe,
857	.remove_new = softing_pdev_remove,
858};
859
860module_platform_driver(softing_driver);
861
862MODULE_ALIAS("platform:softing");
863MODULE_DESCRIPTION("Softing DPRAM CAN driver");
864MODULE_AUTHOR("Kurt Van Dijck <kurt.van.dijck@eia.be>");
865MODULE_LICENSE("GPL v2");