caif_hsi.c 34.4 KB
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/*
 * Copyright (C) ST-Ericsson AB 2010
 * Contact: Sjur Brendeland / sjur.brandeland@stericsson.com
 * Author:  Daniel Martensson / daniel.martensson@stericsson.com
 *	    Dmitry.Tarnyagin  / dmitry.tarnyagin@stericsson.com
 * License terms: GNU General Public License (GPL) version 2.
 */

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#define pr_fmt(fmt) KBUILD_MODNAME fmt

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#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/netdevice.h>
#include <linux/string.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/if_arp.h>
#include <linux/timer.h>
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#include <linux/rtnetlink.h>
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#include <linux/pkt_sched.h>
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#include <net/caif/caif_layer.h>
#include <net/caif/caif_hsi.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Daniel Martensson<daniel.martensson@stericsson.com>");
MODULE_DESCRIPTION("CAIF HSI driver");

/* Returns the number of padding bytes for alignment. */
#define PAD_POW2(x, pow) ((((x)&((pow)-1)) == 0) ? 0 :\
				(((pow)-((x)&((pow)-1)))))

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static int inactivity_timeout = 1000;
module_param(inactivity_timeout, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(inactivity_timeout, "Inactivity timeout on HSI, ms.");

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static int aggregation_timeout = 1;
module_param(aggregation_timeout, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(aggregation_timeout, "Aggregation timeout on HSI, ms.");

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/*
 * HSI padding options.
 * Warning: must be a base of 2 (& operation used) and can not be zero !
 */
static int hsi_head_align = 4;
module_param(hsi_head_align, int, S_IRUGO);
MODULE_PARM_DESC(hsi_head_align, "HSI head alignment.");

static int hsi_tail_align = 4;
module_param(hsi_tail_align, int, S_IRUGO);
MODULE_PARM_DESC(hsi_tail_align, "HSI tail alignment.");

/*
 * HSI link layer flowcontrol thresholds.
 * Warning: A high threshold value migth increase throughput but it will at
 * the same time prevent channel prioritization and increase the risk of
 * flooding the modem. The high threshold should be above the low.
 */
static int hsi_high_threshold = 100;
module_param(hsi_high_threshold, int, S_IRUGO);
MODULE_PARM_DESC(hsi_high_threshold, "HSI high threshold (FLOW OFF).");

static int hsi_low_threshold = 50;
module_param(hsi_low_threshold, int, S_IRUGO);
MODULE_PARM_DESC(hsi_low_threshold, "HSI high threshold (FLOW ON).");

#define ON 1
#define OFF 0

/*
 * Threshold values for the HSI packet queue. Flowcontrol will be asserted
 * when the number of packets exceeds HIGH_WATER_MARK. It will not be
 * de-asserted before the number of packets drops below LOW_WATER_MARK.
 */
#define LOW_WATER_MARK   hsi_low_threshold
#define HIGH_WATER_MARK  hsi_high_threshold

static LIST_HEAD(cfhsi_list);
static spinlock_t cfhsi_list_lock;

static void cfhsi_inactivity_tout(unsigned long arg)
{
	struct cfhsi *cfhsi = (struct cfhsi *)arg;

	dev_dbg(&cfhsi->ndev->dev, "%s.\n",
		__func__);

	/* Schedule power down work queue. */
	if (!test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
		queue_work(cfhsi->wq, &cfhsi->wake_down_work);
}

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static void cfhsi_update_aggregation_stats(struct cfhsi *cfhsi,
					   const struct sk_buff *skb,
					   int direction)
{
	struct caif_payload_info *info;
	int hpad, tpad, len;

	info = (struct caif_payload_info *)&skb->cb;
	hpad = 1 + PAD_POW2((info->hdr_len + 1), hsi_head_align);
	tpad = PAD_POW2((skb->len + hpad), hsi_tail_align);
	len = skb->len + hpad + tpad;

	if (direction > 0)
		cfhsi->aggregation_len += len;
	else if (direction < 0)
		cfhsi->aggregation_len -= len;
}

static bool cfhsi_can_send_aggregate(struct cfhsi *cfhsi)
{
	int i;

	if (cfhsi->aggregation_timeout < 0)
		return true;

	for (i = 0; i < CFHSI_PRIO_BEBK; ++i) {
		if (cfhsi->qhead[i].qlen)
			return true;
	}

	/* TODO: Use aggregation_len instead */
	if (cfhsi->qhead[CFHSI_PRIO_BEBK].qlen >= CFHSI_MAX_PKTS)
		return true;

	return false;
}

static struct sk_buff *cfhsi_dequeue(struct cfhsi *cfhsi)
{
	struct sk_buff *skb;
	int i;

	for (i = 0; i < CFHSI_PRIO_LAST; ++i) {
		skb = skb_dequeue(&cfhsi->qhead[i]);
		if (skb)
			break;
	}

	return skb;
}

static int cfhsi_tx_queue_len(struct cfhsi *cfhsi)
{
	int i, len = 0;
	for (i = 0; i < CFHSI_PRIO_LAST; ++i)
		len += skb_queue_len(&cfhsi->qhead[i]);
	return len;
}

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static void cfhsi_abort_tx(struct cfhsi *cfhsi)
{
	struct sk_buff *skb;

	for (;;) {
		spin_lock_bh(&cfhsi->lock);
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		skb = cfhsi_dequeue(cfhsi);
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		if (!skb)
			break;

		cfhsi->ndev->stats.tx_errors++;
		cfhsi->ndev->stats.tx_dropped++;
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		cfhsi_update_aggregation_stats(cfhsi, skb, -1);
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		spin_unlock_bh(&cfhsi->lock);
		kfree_skb(skb);
	}
	cfhsi->tx_state = CFHSI_TX_STATE_IDLE;
	if (!test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
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		mod_timer(&cfhsi->inactivity_timer,
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			jiffies + cfhsi->inactivity_timeout);
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	spin_unlock_bh(&cfhsi->lock);
}

static int cfhsi_flush_fifo(struct cfhsi *cfhsi)
{
	char buffer[32]; /* Any reasonable value */
	size_t fifo_occupancy;
	int ret;

	dev_dbg(&cfhsi->ndev->dev, "%s.\n",
		__func__);

	do {
		ret = cfhsi->dev->cfhsi_fifo_occupancy(cfhsi->dev,
				&fifo_occupancy);
		if (ret) {
			dev_warn(&cfhsi->ndev->dev,
				"%s: can't get FIFO occupancy: %d.\n",
				__func__, ret);
			break;
		} else if (!fifo_occupancy)
			/* No more data, exitting normally */
			break;

		fifo_occupancy = min(sizeof(buffer), fifo_occupancy);
		set_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits);
		ret = cfhsi->dev->cfhsi_rx(buffer, fifo_occupancy,
				cfhsi->dev);
		if (ret) {
			clear_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits);
			dev_warn(&cfhsi->ndev->dev,
				"%s: can't read data: %d.\n",
				__func__, ret);
			break;
		}

		ret = 5 * HZ;
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		ret = wait_event_interruptible_timeout(cfhsi->flush_fifo_wait,
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			 !test_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits), ret);

		if (ret < 0) {
			dev_warn(&cfhsi->ndev->dev,
				"%s: can't wait for flush complete: %d.\n",
				__func__, ret);
			break;
		} else if (!ret) {
			ret = -ETIMEDOUT;
			dev_warn(&cfhsi->ndev->dev,
				"%s: timeout waiting for flush complete.\n",
				__func__);
			break;
		}
	} while (1);

	return ret;
}

static int cfhsi_tx_frm(struct cfhsi_desc *desc, struct cfhsi *cfhsi)
{
	int nfrms = 0;
	int pld_len = 0;
	struct sk_buff *skb;
	u8 *pfrm = desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ;

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	skb = cfhsi_dequeue(cfhsi);
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	if (!skb)
		return 0;

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	/* Clear offset. */
	desc->offset = 0;

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	/* Check if we can embed a CAIF frame. */
	if (skb->len < CFHSI_MAX_EMB_FRM_SZ) {
		struct caif_payload_info *info;
		int hpad = 0;
		int tpad = 0;

		/* Calculate needed head alignment and tail alignment. */
		info = (struct caif_payload_info *)&skb->cb;

		hpad = 1 + PAD_POW2((info->hdr_len + 1), hsi_head_align);
		tpad = PAD_POW2((skb->len + hpad), hsi_tail_align);

		/* Check if frame still fits with added alignment. */
		if ((skb->len + hpad + tpad) <= CFHSI_MAX_EMB_FRM_SZ) {
			u8 *pemb = desc->emb_frm;
			desc->offset = CFHSI_DESC_SHORT_SZ;
			*pemb = (u8)(hpad - 1);
			pemb += hpad;

			/* Update network statistics. */
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			spin_lock_bh(&cfhsi->lock);
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			cfhsi->ndev->stats.tx_packets++;
			cfhsi->ndev->stats.tx_bytes += skb->len;
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			cfhsi_update_aggregation_stats(cfhsi, skb, -1);
			spin_unlock_bh(&cfhsi->lock);
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			/* Copy in embedded CAIF frame. */
			skb_copy_bits(skb, 0, pemb, skb->len);
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			/* Consume the SKB */
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			consume_skb(skb);
			skb = NULL;
		}
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	}
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	/* Create payload CAIF frames. */
	pfrm = desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ;
	while (nfrms < CFHSI_MAX_PKTS) {
		struct caif_payload_info *info;
		int hpad = 0;
		int tpad = 0;

		if (!skb)
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			skb = cfhsi_dequeue(cfhsi);
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		if (!skb)
			break;

		/* Calculate needed head alignment and tail alignment. */
		info = (struct caif_payload_info *)&skb->cb;

		hpad = 1 + PAD_POW2((info->hdr_len + 1), hsi_head_align);
		tpad = PAD_POW2((skb->len + hpad), hsi_tail_align);

		/* Fill in CAIF frame length in descriptor. */
		desc->cffrm_len[nfrms] = hpad + skb->len + tpad;

		/* Fill head padding information. */
		*pfrm = (u8)(hpad - 1);
		pfrm += hpad;

		/* Update network statistics. */
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		spin_lock_bh(&cfhsi->lock);
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		cfhsi->ndev->stats.tx_packets++;
		cfhsi->ndev->stats.tx_bytes += skb->len;
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		cfhsi_update_aggregation_stats(cfhsi, skb, -1);
		spin_unlock_bh(&cfhsi->lock);
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		/* Copy in CAIF frame. */
		skb_copy_bits(skb, 0, pfrm, skb->len);

		/* Update payload length. */
		pld_len += desc->cffrm_len[nfrms];

		/* Update frame pointer. */
		pfrm += skb->len + tpad;
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		/* Consume the SKB */
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		consume_skb(skb);
		skb = NULL;

		/* Update number of frames. */
		nfrms++;
	}

	/* Unused length fields should be zero-filled (according to SPEC). */
	while (nfrms < CFHSI_MAX_PKTS) {
		desc->cffrm_len[nfrms] = 0x0000;
		nfrms++;
	}

	/* Check if we can piggy-back another descriptor. */
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	if (cfhsi_can_send_aggregate(cfhsi))
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		desc->header |= CFHSI_PIGGY_DESC;
	else
		desc->header &= ~CFHSI_PIGGY_DESC;

	return CFHSI_DESC_SZ + pld_len;
}

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static void cfhsi_start_tx(struct cfhsi *cfhsi)
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{
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	struct cfhsi_desc *desc = (struct cfhsi_desc *)cfhsi->tx_buf;
	int len, res;
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	dev_dbg(&cfhsi->ndev->dev, "%s.\n", __func__);
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	if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
		return;

	do {
		/* Create HSI frame. */
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		len = cfhsi_tx_frm(desc, cfhsi);
		if (!len) {
			spin_lock_bh(&cfhsi->lock);
			if (unlikely(cfhsi_tx_queue_len(cfhsi))) {
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				spin_unlock_bh(&cfhsi->lock);
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				res = -EAGAIN;
				continue;
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			}
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			cfhsi->tx_state = CFHSI_TX_STATE_IDLE;
			/* Start inactivity timer. */
			mod_timer(&cfhsi->inactivity_timer,
				jiffies + cfhsi->inactivity_timeout);
			spin_unlock_bh(&cfhsi->lock);
			break;
		}
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		/* Set up new transfer. */
		res = cfhsi->dev->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->dev);
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		if (WARN_ON(res < 0))
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			dev_err(&cfhsi->ndev->dev, "%s: TX error %d.\n",
				__func__, res);
	} while (res < 0);
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}

static void cfhsi_tx_done(struct cfhsi *cfhsi)
{
	dev_dbg(&cfhsi->ndev->dev, "%s.\n", __func__);

	if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
		return;

	/*
	 * Send flow on if flow off has been previously signalled
	 * and number of packets is below low water mark.
	 */
	spin_lock_bh(&cfhsi->lock);
	if (cfhsi->flow_off_sent &&
			cfhsi_tx_queue_len(cfhsi) <= cfhsi->q_low_mark &&
			cfhsi->cfdev.flowctrl) {

		cfhsi->flow_off_sent = 0;
		cfhsi->cfdev.flowctrl(cfhsi->ndev, ON);
	}

	if (cfhsi_can_send_aggregate(cfhsi)) {
		spin_unlock_bh(&cfhsi->lock);
		cfhsi_start_tx(cfhsi);
	} else {
		mod_timer(&cfhsi->aggregation_timer,
			jiffies + cfhsi->aggregation_timeout);
		spin_unlock_bh(&cfhsi->lock);
	}
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	return;
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}

static void cfhsi_tx_done_cb(struct cfhsi_drv *drv)
{
	struct cfhsi *cfhsi;

	cfhsi = container_of(drv, struct cfhsi, drv);
	dev_dbg(&cfhsi->ndev->dev, "%s.\n",
		__func__);

	if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
		return;
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	cfhsi_tx_done(cfhsi);
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}

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static int cfhsi_rx_desc(struct cfhsi_desc *desc, struct cfhsi *cfhsi)
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{
	int xfer_sz = 0;
	int nfrms = 0;
	u16 *plen = NULL;
	u8 *pfrm = NULL;

	if ((desc->header & ~CFHSI_PIGGY_DESC) ||
			(desc->offset > CFHSI_MAX_EMB_FRM_SZ)) {
		dev_err(&cfhsi->ndev->dev, "%s: Invalid descriptor.\n",
			__func__);
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		return -EPROTO;
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	}

	/* Check for embedded CAIF frame. */
	if (desc->offset) {
		struct sk_buff *skb;
		u8 *dst = NULL;
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		int len = 0;
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		pfrm = ((u8 *)desc) + desc->offset;

		/* Remove offset padding. */
		pfrm += *pfrm + 1;

		/* Read length of CAIF frame (little endian). */
		len = *pfrm;
		len |= ((*(pfrm+1)) << 8) & 0xFF00;
		len += 2;	/* Add FCS fields. */

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		/* Sanity check length of CAIF frame. */
		if (unlikely(len > CFHSI_MAX_CAIF_FRAME_SZ)) {
			dev_err(&cfhsi->ndev->dev, "%s: Invalid length.\n",
				__func__);
			return -EPROTO;
		}
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		/* Allocate SKB (OK even in IRQ context). */
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		skb = alloc_skb(len + 1, GFP_ATOMIC);
		if (!skb) {
			dev_err(&cfhsi->ndev->dev, "%s: Out of memory !\n",
				__func__);
			return -ENOMEM;
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		}
		caif_assert(skb != NULL);

		dst = skb_put(skb, len);
		memcpy(dst, pfrm, len);

		skb->protocol = htons(ETH_P_CAIF);
		skb_reset_mac_header(skb);
		skb->dev = cfhsi->ndev;

		/*
		 * We are called from a arch specific platform device.
		 * Unfortunately we don't know what context we're
		 * running in.
		 */
		if (in_interrupt())
			netif_rx(skb);
		else
			netif_rx_ni(skb);

		/* Update network statistics. */
		cfhsi->ndev->stats.rx_packets++;
		cfhsi->ndev->stats.rx_bytes += len;
	}

	/* Calculate transfer length. */
	plen = desc->cffrm_len;
	while (nfrms < CFHSI_MAX_PKTS && *plen) {
		xfer_sz += *plen;
		plen++;
		nfrms++;
	}

	/* Check for piggy-backed descriptor. */
	if (desc->header & CFHSI_PIGGY_DESC)
		xfer_sz += CFHSI_DESC_SZ;

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	if ((xfer_sz % 4) || (xfer_sz > (CFHSI_BUF_SZ_RX - CFHSI_DESC_SZ))) {
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		dev_err(&cfhsi->ndev->dev,
				"%s: Invalid payload len: %d, ignored.\n",
			__func__, xfer_sz);
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		return -EPROTO;
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	}
	return xfer_sz;
}

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static int cfhsi_rx_desc_len(struct cfhsi_desc *desc)
{
	int xfer_sz = 0;
	int nfrms = 0;
	u16 *plen;

	if ((desc->header & ~CFHSI_PIGGY_DESC) ||
			(desc->offset > CFHSI_MAX_EMB_FRM_SZ)) {

		pr_err("Invalid descriptor. %x %x\n", desc->header,
				desc->offset);
		return -EPROTO;
	}

	/* Calculate transfer length. */
	plen = desc->cffrm_len;
	while (nfrms < CFHSI_MAX_PKTS && *plen) {
		xfer_sz += *plen;
		plen++;
		nfrms++;
	}

	if (xfer_sz % 4) {
		pr_err("Invalid payload len: %d, ignored.\n", xfer_sz);
		return -EPROTO;
	}
	return xfer_sz;
}

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static int cfhsi_rx_pld(struct cfhsi_desc *desc, struct cfhsi *cfhsi)
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{
	int rx_sz = 0;
	int nfrms = 0;
	u16 *plen = NULL;
	u8 *pfrm = NULL;

	/* Sanity check header and offset. */
	if (WARN_ON((desc->header & ~CFHSI_PIGGY_DESC) ||
			(desc->offset > CFHSI_MAX_EMB_FRM_SZ))) {
		dev_err(&cfhsi->ndev->dev, "%s: Invalid descriptor.\n",
			__func__);
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		return -EPROTO;
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	}

	/* Set frame pointer to start of payload. */
	pfrm = desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ;
	plen = desc->cffrm_len;
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	/* Skip already processed frames. */
	while (nfrms < cfhsi->rx_state.nfrms) {
		pfrm += *plen;
		rx_sz += *plen;
		plen++;
		nfrms++;
	}

	/* Parse payload. */
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	while (nfrms < CFHSI_MAX_PKTS && *plen) {
		struct sk_buff *skb;
		u8 *dst = NULL;
		u8 *pcffrm = NULL;
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		int len = 0;
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		/* CAIF frame starts after head padding. */
		pcffrm = pfrm + *pfrm + 1;

		/* Read length of CAIF frame (little endian). */
		len = *pcffrm;
		len |= ((*(pcffrm + 1)) << 8) & 0xFF00;
		len += 2;	/* Add FCS fields. */

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		/* Sanity check length of CAIF frames. */
		if (unlikely(len > CFHSI_MAX_CAIF_FRAME_SZ)) {
			dev_err(&cfhsi->ndev->dev, "%s: Invalid length.\n",
				__func__);
			return -EPROTO;
		}

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		/* Allocate SKB (OK even in IRQ context). */
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		skb = alloc_skb(len + 1, GFP_ATOMIC);
		if (!skb) {
			dev_err(&cfhsi->ndev->dev, "%s: Out of memory !\n",
				__func__);
			cfhsi->rx_state.nfrms = nfrms;
			return -ENOMEM;
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		}
		caif_assert(skb != NULL);

		dst = skb_put(skb, len);
		memcpy(dst, pcffrm, len);

		skb->protocol = htons(ETH_P_CAIF);
		skb_reset_mac_header(skb);
		skb->dev = cfhsi->ndev;

		/*
		 * We're called from a platform device,
		 * and don't know the context we're running in.
		 */
		if (in_interrupt())
			netif_rx(skb);
		else
			netif_rx_ni(skb);

		/* Update network statistics. */
		cfhsi->ndev->stats.rx_packets++;
		cfhsi->ndev->stats.rx_bytes += len;

		pfrm += *plen;
		rx_sz += *plen;
		plen++;
		nfrms++;
	}

	return rx_sz;
}

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static void cfhsi_rx_done(struct cfhsi *cfhsi)
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{
	int res;
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	int desc_pld_len = 0, rx_len, rx_state;
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	struct cfhsi_desc *desc = NULL;
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	u8 *rx_ptr, *rx_buf;
	struct cfhsi_desc *piggy_desc = NULL;
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	desc = (struct cfhsi_desc *)cfhsi->rx_buf;

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	dev_dbg(&cfhsi->ndev->dev, "%s\n", __func__);
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	if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
		return;

	/* Update inactivity timer if pending. */
648
	spin_lock_bh(&cfhsi->lock);
649
	mod_timer_pending(&cfhsi->inactivity_timer,
650
			jiffies + cfhsi->inactivity_timeout);
651
	spin_unlock_bh(&cfhsi->lock);
652

653
	if (cfhsi->rx_state.state == CFHSI_RX_STATE_DESC) {
654 655 656
		desc_pld_len = cfhsi_rx_desc_len(desc);

		if (desc_pld_len < 0)
657
			goto out_of_sync;
658 659 660 661 662 663 664

		rx_buf = cfhsi->rx_buf;
		rx_len = desc_pld_len;
		if (desc_pld_len > 0 && (desc->header & CFHSI_PIGGY_DESC))
			rx_len += CFHSI_DESC_SZ;
		if (desc_pld_len == 0)
			rx_buf = cfhsi->rx_flip_buf;
665
	} else {
666
		rx_buf = cfhsi->rx_flip_buf;
667

668 669 670
		rx_len = CFHSI_DESC_SZ;
		if (cfhsi->rx_state.pld_len > 0 &&
				(desc->header & CFHSI_PIGGY_DESC)) {
671 672 673

			piggy_desc = (struct cfhsi_desc *)
				(desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ +
674 675
						cfhsi->rx_state.pld_len);

676
			cfhsi->rx_state.piggy_desc = true;
677

678 679 680 681 682
			/* Extract payload len from piggy-backed descriptor. */
			desc_pld_len = cfhsi_rx_desc_len(piggy_desc);
			if (desc_pld_len < 0)
				goto out_of_sync;

683
			if (desc_pld_len > 0) {
684
				rx_len = desc_pld_len;
685 686 687
				if (piggy_desc->header & CFHSI_PIGGY_DESC)
					rx_len += CFHSI_DESC_SZ;
			}
688 689 690 691 692

			/*
			 * Copy needed information from the piggy-backed
			 * descriptor to the descriptor in the start.
			 */
693
			memcpy(rx_buf, (u8 *)piggy_desc,
694
					CFHSI_DESC_SHORT_SZ);
695 696
			/* Mark no embedded frame here */
			piggy_desc->offset = 0;
697
		}
698 699
	}

700
	if (desc_pld_len) {
701 702
		rx_state = CFHSI_RX_STATE_PAYLOAD;
		rx_ptr = rx_buf + CFHSI_DESC_SZ;
703
	} else {
704 705 706
		rx_state = CFHSI_RX_STATE_DESC;
		rx_ptr = rx_buf;
		rx_len = CFHSI_DESC_SZ;
707 708
	}

709
	/* Initiate next read */
710 711 712
	if (test_bit(CFHSI_AWAKE, &cfhsi->bits)) {
		/* Set up new transfer. */
		dev_dbg(&cfhsi->ndev->dev, "%s: Start RX.\n",
713 714 715
				__func__);

		res = cfhsi->dev->cfhsi_rx(rx_ptr, rx_len,
716 717 718 719 720 721 722 723
				cfhsi->dev);
		if (WARN_ON(res < 0)) {
			dev_err(&cfhsi->ndev->dev, "%s: RX error %d.\n",
				__func__, res);
			cfhsi->ndev->stats.rx_errors++;
			cfhsi->ndev->stats.rx_dropped++;
		}
	}
724

725 726 727 728 729 730 731 732 733 734 735 736 737
	if (cfhsi->rx_state.state == CFHSI_RX_STATE_DESC) {
		/* Extract payload from descriptor */
		if (cfhsi_rx_desc(desc, cfhsi) < 0)
			goto out_of_sync;
	} else {
		/* Extract payload */
		if (cfhsi_rx_pld(desc, cfhsi) < 0)
			goto out_of_sync;
		if (piggy_desc) {
			/* Extract any payload in piggyback descriptor. */
			if (cfhsi_rx_desc(piggy_desc, cfhsi) < 0)
				goto out_of_sync;
		}
738
	}
739 740 741 742 743 744 745 746 747 748 749

	/* Update state info */
	memset(&cfhsi->rx_state, 0, sizeof(cfhsi->rx_state));
	cfhsi->rx_state.state = rx_state;
	cfhsi->rx_ptr = rx_ptr;
	cfhsi->rx_len = rx_len;
	cfhsi->rx_state.pld_len = desc_pld_len;
	cfhsi->rx_state.piggy_desc = desc->header & CFHSI_PIGGY_DESC;

	if (rx_buf != cfhsi->rx_buf)
		swap(cfhsi->rx_buf, cfhsi->rx_flip_buf);
750 751 752 753 754 755 756
	return;

out_of_sync:
	dev_err(&cfhsi->ndev->dev, "%s: Out of sync.\n", __func__);
	print_hex_dump_bytes("--> ", DUMP_PREFIX_NONE,
			cfhsi->rx_buf, CFHSI_DESC_SZ);
	schedule_work(&cfhsi->out_of_sync_work);
757 758 759 760 761 762 763 764 765 766
}

static void cfhsi_rx_slowpath(unsigned long arg)
{
	struct cfhsi *cfhsi = (struct cfhsi *)arg;

	dev_dbg(&cfhsi->ndev->dev, "%s.\n",
		__func__);

	cfhsi_rx_done(cfhsi);
767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782
}

static void cfhsi_rx_done_cb(struct cfhsi_drv *drv)
{
	struct cfhsi *cfhsi;

	cfhsi = container_of(drv, struct cfhsi, drv);
	dev_dbg(&cfhsi->ndev->dev, "%s.\n",
		__func__);

	if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
		return;

	if (test_and_clear_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits))
		wake_up_interruptible(&cfhsi->flush_fifo_wait);
	else
783
		cfhsi_rx_done(cfhsi);
784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801
}

static void cfhsi_wake_up(struct work_struct *work)
{
	struct cfhsi *cfhsi = NULL;
	int res;
	int len;
	long ret;

	cfhsi = container_of(work, struct cfhsi, wake_up_work);

	if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
		return;

	if (unlikely(test_bit(CFHSI_AWAKE, &cfhsi->bits))) {
		/* It happenes when wakeup is requested by
		 * both ends at the same time. */
		clear_bit(CFHSI_WAKE_UP, &cfhsi->bits);
802
		clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits);
803 804 805 806 807 808 809 810 811 812
		return;
	}

	/* Activate wake line. */
	cfhsi->dev->cfhsi_wake_up(cfhsi->dev);

	dev_dbg(&cfhsi->ndev->dev, "%s: Start waiting.\n",
		__func__);

	/* Wait for acknowledge. */
813 814 815
	ret = CFHSI_WAKE_TOUT;
	ret = wait_event_interruptible_timeout(cfhsi->wake_up_wait,
					test_and_clear_bit(CFHSI_WAKE_UP_ACK,
816 817 818
							&cfhsi->bits), ret);
	if (unlikely(ret < 0)) {
		/* Interrupted by signal. */
819
		dev_err(&cfhsi->ndev->dev, "%s: Signalled: %ld.\n",
820
			__func__, ret);
821

822 823 824 825
		clear_bit(CFHSI_WAKE_UP, &cfhsi->bits);
		cfhsi->dev->cfhsi_wake_down(cfhsi->dev);
		return;
	} else if (!ret) {
826 827 828
		bool ca_wake = false;
		size_t fifo_occupancy = 0;

829
		/* Wakeup timeout */
830
		dev_dbg(&cfhsi->ndev->dev, "%s: Timeout.\n",
831
			__func__);
832 833 834 835 836

		/* Check FIFO to check if modem has sent something. */
		WARN_ON(cfhsi->dev->cfhsi_fifo_occupancy(cfhsi->dev,
					&fifo_occupancy));

837
		dev_dbg(&cfhsi->ndev->dev, "%s: Bytes in FIFO: %u.\n",
838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854
				__func__, (unsigned) fifo_occupancy);

		/* Check if we misssed the interrupt. */
		WARN_ON(cfhsi->dev->cfhsi_get_peer_wake(cfhsi->dev,
							&ca_wake));

		if (ca_wake) {
			dev_err(&cfhsi->ndev->dev, "%s: CA Wake missed !.\n",
				__func__);

			/* Clear the CFHSI_WAKE_UP_ACK bit to prevent race. */
			clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits);

			/* Continue execution. */
			goto wake_ack;
		}

855 856 857 858
		clear_bit(CFHSI_WAKE_UP, &cfhsi->bits);
		cfhsi->dev->cfhsi_wake_down(cfhsi->dev);
		return;
	}
859
wake_ack:
860 861 862 863 864 865 866 867
	dev_dbg(&cfhsi->ndev->dev, "%s: Woken.\n",
		__func__);

	/* Clear power up bit. */
	set_bit(CFHSI_AWAKE, &cfhsi->bits);
	clear_bit(CFHSI_WAKE_UP, &cfhsi->bits);

	/* Resume read operation. */
868 869 870 871 872
	dev_dbg(&cfhsi->ndev->dev, "%s: Start RX.\n", __func__);
	res = cfhsi->dev->cfhsi_rx(cfhsi->rx_ptr, cfhsi->rx_len, cfhsi->dev);

	if (WARN_ON(res < 0))
		dev_err(&cfhsi->ndev->dev, "%s: RX err %d.\n", __func__, res);
873 874 875 876 877 878

	/* Clear power up acknowledment. */
	clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits);

	spin_lock_bh(&cfhsi->lock);

879 880
	/* Resume transmit if queues are not empty. */
	if (!cfhsi_tx_queue_len(cfhsi)) {
881 882 883
		dev_dbg(&cfhsi->ndev->dev, "%s: Peer wake, start timer.\n",
			__func__);
		/* Start inactivity timer. */
884
		mod_timer(&cfhsi->inactivity_timer,
885
				jiffies + cfhsi->inactivity_timeout);
886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916
		spin_unlock_bh(&cfhsi->lock);
		return;
	}

	dev_dbg(&cfhsi->ndev->dev, "%s: Host wake.\n",
		__func__);

	spin_unlock_bh(&cfhsi->lock);

	/* Create HSI frame. */
	len = cfhsi_tx_frm((struct cfhsi_desc *)cfhsi->tx_buf, cfhsi);

	if (likely(len > 0)) {
		/* Set up new transfer. */
		res = cfhsi->dev->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->dev);
		if (WARN_ON(res < 0)) {
			dev_err(&cfhsi->ndev->dev, "%s: TX error %d.\n",
				__func__, res);
			cfhsi_abort_tx(cfhsi);
		}
	} else {
		dev_err(&cfhsi->ndev->dev,
				"%s: Failed to create HSI frame: %d.\n",
				__func__, len);
	}
}

static void cfhsi_wake_down(struct work_struct *work)
{
	long ret;
	struct cfhsi *cfhsi = NULL;
917 918
	size_t fifo_occupancy = 0;
	int retry = CFHSI_WAKE_TOUT;
919 920

	cfhsi = container_of(work, struct cfhsi, wake_down_work);
921
	dev_dbg(&cfhsi->ndev->dev, "%s.\n", __func__);
922 923 924 925 926 927 928 929

	if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
		return;

	/* Deactivate wake line. */
	cfhsi->dev->cfhsi_wake_down(cfhsi->dev);

	/* Wait for acknowledge. */
930
	ret = CFHSI_WAKE_TOUT;
931
	ret = wait_event_interruptible_timeout(cfhsi->wake_down_wait,
932 933
					test_and_clear_bit(CFHSI_WAKE_DOWN_ACK,
							&cfhsi->bits), ret);
934 935
	if (ret < 0) {
		/* Interrupted by signal. */
936
		dev_err(&cfhsi->ndev->dev, "%s: Signalled: %ld.\n",
937 938 939
			__func__, ret);
		return;
	} else if (!ret) {
940 941
		bool ca_wake = true;

942
		/* Timeout */
943
		dev_err(&cfhsi->ndev->dev, "%s: Timeout.\n", __func__);
944 945 946 947 948 949 950

		/* Check if we misssed the interrupt. */
		WARN_ON(cfhsi->dev->cfhsi_get_peer_wake(cfhsi->dev,
							&ca_wake));
		if (!ca_wake)
			dev_err(&cfhsi->ndev->dev, "%s: CA Wake missed !.\n",
				__func__);
951 952
	}

953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969
	/* Check FIFO occupancy. */
	while (retry) {
		WARN_ON(cfhsi->dev->cfhsi_fifo_occupancy(cfhsi->dev,
							&fifo_occupancy));

		if (!fifo_occupancy)
			break;

		set_current_state(TASK_INTERRUPTIBLE);
		schedule_timeout(1);
		retry--;
	}

	if (!retry)
		dev_err(&cfhsi->ndev->dev, "%s: FIFO Timeout.\n", __func__);

	/* Clear AWAKE condition. */
970 971
	clear_bit(CFHSI_AWAKE, &cfhsi->bits);

972 973
	/* Cancel pending RX requests. */
	cfhsi->dev->cfhsi_rx_cancel(cfhsi->dev);
974 975 976

}

977 978 979 980 981 982 983 984 985 986 987
static void cfhsi_out_of_sync(struct work_struct *work)
{
	struct cfhsi *cfhsi = NULL;

	cfhsi = container_of(work, struct cfhsi, out_of_sync_work);

	rtnl_lock();
	dev_close(cfhsi->ndev);
	rtnl_unlock();
}

988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019
static void cfhsi_wake_up_cb(struct cfhsi_drv *drv)
{
	struct cfhsi *cfhsi = NULL;

	cfhsi = container_of(drv, struct cfhsi, drv);
	dev_dbg(&cfhsi->ndev->dev, "%s.\n",
		__func__);

	set_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits);
	wake_up_interruptible(&cfhsi->wake_up_wait);

	if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
		return;

	/* Schedule wake up work queue if the peer initiates. */
	if (!test_and_set_bit(CFHSI_WAKE_UP, &cfhsi->bits))
		queue_work(cfhsi->wq, &cfhsi->wake_up_work);
}

static void cfhsi_wake_down_cb(struct cfhsi_drv *drv)
{
	struct cfhsi *cfhsi = NULL;

	cfhsi = container_of(drv, struct cfhsi, drv);
	dev_dbg(&cfhsi->ndev->dev, "%s.\n",
		__func__);

	/* Initiating low power is only permitted by the host (us). */
	set_bit(CFHSI_WAKE_DOWN_ACK, &cfhsi->bits);
	wake_up_interruptible(&cfhsi->wake_down_wait);
}

1020 1021 1022 1023 1024 1025 1026 1027 1028 1029
static void cfhsi_aggregation_tout(unsigned long arg)
{
	struct cfhsi *cfhsi = (struct cfhsi *)arg;

	dev_dbg(&cfhsi->ndev->dev, "%s.\n",
		__func__);

	cfhsi_start_tx(cfhsi);
}

1030 1031 1032 1033 1034
static int cfhsi_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct cfhsi *cfhsi = NULL;
	int start_xfer = 0;
	int timer_active;
1035
	int prio;
1036 1037 1038 1039 1040 1041

	if (!dev)
		return -EINVAL;

	cfhsi = netdev_priv(dev);

1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059
	switch (skb->priority) {
	case TC_PRIO_BESTEFFORT:
	case TC_PRIO_FILLER:
	case TC_PRIO_BULK:
		prio = CFHSI_PRIO_BEBK;
		break;
	case TC_PRIO_INTERACTIVE_BULK:
		prio = CFHSI_PRIO_VI;
		break;
	case TC_PRIO_INTERACTIVE:
		prio = CFHSI_PRIO_VO;
		break;
	case TC_PRIO_CONTROL:
	default:
		prio = CFHSI_PRIO_CTL;
		break;
	}

1060 1061
	spin_lock_bh(&cfhsi->lock);

1062 1063 1064 1065 1066
	/* Update aggregation statistics  */
	cfhsi_update_aggregation_stats(cfhsi, skb, 1);

	/* Queue the SKB */
	skb_queue_tail(&cfhsi->qhead[prio], skb);
1067 1068 1069 1070 1071 1072 1073 1074 1075 1076

	/* Sanity check; xmit should not be called after unregister_netdev */
	if (WARN_ON(test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))) {
		spin_unlock_bh(&cfhsi->lock);
		cfhsi_abort_tx(cfhsi);
		return -EINVAL;
	}

	/* Send flow off if number of packets is above high water mark. */
	if (!cfhsi->flow_off_sent &&
1077
		cfhsi_tx_queue_len(cfhsi) > cfhsi->q_high_mark &&
1078 1079 1080 1081 1082 1083 1084 1085 1086 1087
		cfhsi->cfdev.flowctrl) {
		cfhsi->flow_off_sent = 1;
		cfhsi->cfdev.flowctrl(cfhsi->ndev, OFF);
	}

	if (cfhsi->tx_state == CFHSI_TX_STATE_IDLE) {
		cfhsi->tx_state = CFHSI_TX_STATE_XFER;
		start_xfer = 1;
	}

1088
	if (!start_xfer) {
1089 1090 1091 1092
		/* Send aggregate if it is possible */
		bool aggregate_ready =
			cfhsi_can_send_aggregate(cfhsi) &&
			del_timer(&cfhsi->aggregation_timer) > 0;
1093
		spin_unlock_bh(&cfhsi->lock);
1094 1095
		if (aggregate_ready)
			cfhsi_start_tx(cfhsi);
1096
		return 0;
1097
	}
1098 1099

	/* Delete inactivity timer if started. */
1100
	timer_active = del_timer_sync(&cfhsi->inactivity_timer);
1101

1102 1103
	spin_unlock_bh(&cfhsi->lock);

1104 1105 1106 1107 1108 1109 1110
	if (timer_active) {
		struct cfhsi_desc *desc = (struct cfhsi_desc *)cfhsi->tx_buf;
		int len;
		int res;

		/* Create HSI frame. */
		len = cfhsi_tx_frm(desc, cfhsi);
1111
		WARN_ON(!len);
1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128

		/* Set up new transfer. */
		res = cfhsi->dev->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->dev);
		if (WARN_ON(res < 0)) {
			dev_err(&cfhsi->ndev->dev, "%s: TX error %d.\n",
				__func__, res);
			cfhsi_abort_tx(cfhsi);
		}
	} else {
		/* Schedule wake up work queue if the we initiate. */
		if (!test_and_set_bit(CFHSI_WAKE_UP, &cfhsi->bits))
			queue_work(cfhsi->wq, &cfhsi->wake_up_work);
	}

	return 0;
}

1129
static const struct net_device_ops cfhsi_ops;
1130 1131 1132

static void cfhsi_setup(struct net_device *dev)
{
1133
	int i;
1134 1135 1136 1137 1138
	struct cfhsi *cfhsi = netdev_priv(dev);
	dev->features = 0;
	dev->netdev_ops = &cfhsi_ops;
	dev->type = ARPHRD_CAIF;
	dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1139
	dev->mtu = CFHSI_MAX_CAIF_FRAME_SZ;
1140 1141
	dev->tx_queue_len = 0;
	dev->destructor = free_netdev;
1142 1143
	for (i = 0; i < CFHSI_PRIO_LAST; ++i)
		skb_queue_head_init(&cfhsi->qhead[i]);
1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154
	cfhsi->cfdev.link_select = CAIF_LINK_HIGH_BANDW;
	cfhsi->cfdev.use_frag = false;
	cfhsi->cfdev.use_stx = false;
	cfhsi->cfdev.use_fcs = false;
	cfhsi->ndev = dev;
}

int cfhsi_probe(struct platform_device *pdev)
{
	struct cfhsi *cfhsi = NULL;
	struct net_device *ndev;
1155

1156 1157 1158
	int res;

	ndev = alloc_netdev(sizeof(struct cfhsi), "cfhsi%d", cfhsi_setup);
1159
	if (!ndev)
1160 1161 1162 1163 1164 1165
		return -ENODEV;

	cfhsi = netdev_priv(ndev);
	cfhsi->ndev = ndev;
	cfhsi->pdev = pdev;

1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193
	/* Assign the HSI device. */
	cfhsi->dev = pdev->dev.platform_data;

	/* Assign the driver to this HSI device. */
	cfhsi->dev->drv = &cfhsi->drv;

	/* Register network device. */
	res = register_netdev(ndev);
	if (res) {
		dev_err(&ndev->dev, "%s: Registration error: %d.\n",
			__func__, res);
		free_netdev(ndev);
	}
	/* Add CAIF HSI device to list. */
	spin_lock(&cfhsi_list_lock);
	list_add_tail(&cfhsi->list, &cfhsi_list);
	spin_unlock(&cfhsi_list_lock);

	return res;
}

static int cfhsi_open(struct net_device *ndev)
{
	struct cfhsi *cfhsi = netdev_priv(ndev);
	int res;

	clear_bit(CFHSI_SHUTDOWN, &cfhsi->bits);

1194 1195
	/* Initialize state vaiables. */
	cfhsi->tx_state = CFHSI_TX_STATE_IDLE;
1196
	cfhsi->rx_state.state = CFHSI_RX_STATE_DESC;
1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223

	/* Set flow info */
	cfhsi->flow_off_sent = 0;
	cfhsi->q_low_mark = LOW_WATER_MARK;
	cfhsi->q_high_mark = HIGH_WATER_MARK;


	/*
	 * Allocate a TX buffer with the size of a HSI packet descriptors
	 * and the necessary room for CAIF payload frames.
	 */
	cfhsi->tx_buf = kzalloc(CFHSI_BUF_SZ_TX, GFP_KERNEL);
	if (!cfhsi->tx_buf) {
		res = -ENODEV;
		goto err_alloc_tx;
	}

	/*
	 * Allocate a RX buffer with the size of two HSI packet descriptors and
	 * the necessary room for CAIF payload frames.
	 */
	cfhsi->rx_buf = kzalloc(CFHSI_BUF_SZ_RX, GFP_KERNEL);
	if (!cfhsi->rx_buf) {
		res = -ENODEV;
		goto err_alloc_rx;
	}

1224 1225 1226 1227 1228 1229
	cfhsi->rx_flip_buf = kzalloc(CFHSI_BUF_SZ_RX, GFP_KERNEL);
	if (!cfhsi->rx_flip_buf) {
		res = -ENODEV;
		goto err_alloc_rx_flip;
	}

1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241
	/* Pre-calculate inactivity timeout. */
	if (inactivity_timeout != -1) {
		cfhsi->inactivity_timeout =
				inactivity_timeout * HZ / 1000;
		if (!cfhsi->inactivity_timeout)
			cfhsi->inactivity_timeout = 1;
		else if (cfhsi->inactivity_timeout > NEXT_TIMER_MAX_DELTA)
			cfhsi->inactivity_timeout = NEXT_TIMER_MAX_DELTA;
	} else {
		cfhsi->inactivity_timeout = NEXT_TIMER_MAX_DELTA;
	}

1242 1243 1244
	/* Initialize aggregation timeout */
	cfhsi->aggregation_timeout = aggregation_timeout;

1245
	/* Initialize recieve vaiables. */
1246 1247 1248 1249 1250 1251 1252 1253 1254
	cfhsi->rx_ptr = cfhsi->rx_buf;
	cfhsi->rx_len = CFHSI_DESC_SZ;

	/* Initialize spin locks. */
	spin_lock_init(&cfhsi->lock);

	/* Set up the driver. */
	cfhsi->drv.tx_done_cb = cfhsi_tx_done_cb;
	cfhsi->drv.rx_done_cb = cfhsi_rx_done_cb;
1255 1256
	cfhsi->drv.wake_up_cb = cfhsi_wake_up_cb;
	cfhsi->drv.wake_down_cb = cfhsi_wake_down_cb;
1257 1258 1259 1260

	/* Initialize the work queues. */
	INIT_WORK(&cfhsi->wake_up_work, cfhsi_wake_up);
	INIT_WORK(&cfhsi->wake_down_work, cfhsi_wake_down);
1261
	INIT_WORK(&cfhsi->out_of_sync_work, cfhsi_out_of_sync);
1262 1263 1264 1265 1266 1267 1268 1269

	/* Clear all bit fields. */
	clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits);
	clear_bit(CFHSI_WAKE_DOWN_ACK, &cfhsi->bits);
	clear_bit(CFHSI_WAKE_UP, &cfhsi->bits);
	clear_bit(CFHSI_AWAKE, &cfhsi->bits);

	/* Create work thread. */
1270
	cfhsi->wq = create_singlethread_workqueue(cfhsi->pdev->name);
1271
	if (!cfhsi->wq) {
1272
		dev_err(&cfhsi->ndev->dev, "%s: Failed to create work queue.\n",
1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283
			__func__);
		res = -ENODEV;
		goto err_create_wq;
	}

	/* Initialize wait queues. */
	init_waitqueue_head(&cfhsi->wake_up_wait);
	init_waitqueue_head(&cfhsi->wake_down_wait);
	init_waitqueue_head(&cfhsi->flush_fifo_wait);

	/* Setup the inactivity timer. */
1284 1285 1286
	init_timer(&cfhsi->inactivity_timer);
	cfhsi->inactivity_timer.data = (unsigned long)cfhsi;
	cfhsi->inactivity_timer.function = cfhsi_inactivity_tout;
1287 1288 1289 1290
	/* Setup the slowpath RX timer. */
	init_timer(&cfhsi->rx_slowpath_timer);
	cfhsi->rx_slowpath_timer.data = (unsigned long)cfhsi;
	cfhsi->rx_slowpath_timer.function = cfhsi_rx_slowpath;
1291 1292 1293 1294
	/* Setup the aggregation timer. */
	init_timer(&cfhsi->aggregation_timer);
	cfhsi->aggregation_timer.data = (unsigned long)cfhsi;
	cfhsi->aggregation_timer.function = cfhsi_aggregation_tout;
1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307

	/* Activate HSI interface. */
	res = cfhsi->dev->cfhsi_up(cfhsi->dev);
	if (res) {
		dev_err(&cfhsi->ndev->dev,
			"%s: can't activate HSI interface: %d.\n",
			__func__, res);
		goto err_activate;
	}

	/* Flush FIFO */
	res = cfhsi_flush_fifo(cfhsi);
	if (res) {
1308
		dev_err(&cfhsi->ndev->dev, "%s: Can't flush FIFO: %d.\n",
1309 1310 1311 1312 1313