diff options
Diffstat (limited to 'drivers/net/caif/caif_hsi.c')
| -rw-r--r-- | drivers/net/caif/caif_hsi.c | 1481 |
1 files changed, 1481 insertions, 0 deletions
diff --git a/drivers/net/caif/caif_hsi.c b/drivers/net/caif/caif_hsi.c new file mode 100644 index 000000000..b3b922adc --- /dev/null +++ b/drivers/net/caif/caif_hsi.c @@ -0,0 +1,1481 @@ +/* + * Copyright (C) ST-Ericsson AB 2010 + * Author: Daniel Martensson + * Dmitry.Tarnyagin / dmitry.tarnyagin@lockless.no + * License terms: GNU General Public License (GPL) version 2. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME fmt + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/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> +#include <net/rtnetlink.h> +#include <linux/pkt_sched.h> +#include <net/caif/caif_layer.h> +#include <net/caif/caif_hsi.h> + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Daniel Martensson"); +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))))) + +static const struct cfhsi_config hsi_default_config = { + + /* Inactivity timeout on HSI, ms */ + .inactivity_timeout = HZ, + + /* Aggregation timeout (ms) of zero means no aggregation is done*/ + .aggregation_timeout = 1, + + /* + * HSI link layer flow-control thresholds. + * Threshold values for the HSI packet queue. Flow-control will be + * asserted when the number of packets exceeds q_high_mark. It will + * not be de-asserted before the number of packets drops below + * q_low_mark. + * Warning: A high threshold value might 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. + */ + .q_high_mark = 100, + .q_low_mark = 50, + + /* + * HSI padding options. + * Warning: must be a base of 2 (& operation used) and can not be zero ! + */ + .head_align = 4, + .tail_align = 4, +}; + +#define ON 1 +#define OFF 0 + +static LIST_HEAD(cfhsi_list); + +static void cfhsi_inactivity_tout(unsigned long arg) +{ + struct cfhsi *cfhsi = (struct cfhsi *)arg; + + netdev_dbg(cfhsi->ndev, "%s.\n", + __func__); + + /* Schedule power down work queue. */ + if (!test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) + queue_work(cfhsi->wq, &cfhsi->wake_down_work); +} + +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), cfhsi->cfg.head_align); + tpad = PAD_POW2((skb->len + hpad), cfhsi->cfg.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->cfg.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; +} + +static void cfhsi_abort_tx(struct cfhsi *cfhsi) +{ + struct sk_buff *skb; + + for (;;) { + spin_lock_bh(&cfhsi->lock); + skb = cfhsi_dequeue(cfhsi); + if (!skb) + break; + + cfhsi->ndev->stats.tx_errors++; + cfhsi->ndev->stats.tx_dropped++; + cfhsi_update_aggregation_stats(cfhsi, skb, -1); + spin_unlock_bh(&cfhsi->lock); + kfree_skb(skb); + } + cfhsi->tx_state = CFHSI_TX_STATE_IDLE; + if (!test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) + mod_timer(&cfhsi->inactivity_timer, + jiffies + cfhsi->cfg.inactivity_timeout); + 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; + + netdev_dbg(cfhsi->ndev, "%s.\n", + __func__); + + do { + ret = cfhsi->ops->cfhsi_fifo_occupancy(cfhsi->ops, + &fifo_occupancy); + if (ret) { + netdev_warn(cfhsi->ndev, + "%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->ops->cfhsi_rx(buffer, fifo_occupancy, + cfhsi->ops); + if (ret) { + clear_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits); + netdev_warn(cfhsi->ndev, + "%s: can't read data: %d.\n", + __func__, ret); + break; + } + + ret = 5 * HZ; + ret = wait_event_interruptible_timeout(cfhsi->flush_fifo_wait, + !test_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits), ret); + + if (ret < 0) { + netdev_warn(cfhsi->ndev, + "%s: can't wait for flush complete: %d.\n", + __func__, ret); + break; + } else if (!ret) { + ret = -ETIMEDOUT; + netdev_warn(cfhsi->ndev, + "%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; + + skb = cfhsi_dequeue(cfhsi); + if (!skb) + return 0; + + /* Clear offset. */ + desc->offset = 0; + + /* Check if we can embed a CAIF frame. */ + if (skb->len < CFHSI_MAX_EMB_FRM_SZ) { + struct caif_payload_info *info; + int hpad; + int tpad; + + /* Calculate needed head alignment and tail alignment. */ + info = (struct caif_payload_info *)&skb->cb; + + hpad = 1 + PAD_POW2((info->hdr_len + 1), cfhsi->cfg.head_align); + tpad = PAD_POW2((skb->len + hpad), cfhsi->cfg.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. */ + spin_lock_bh(&cfhsi->lock); + cfhsi->ndev->stats.tx_packets++; + cfhsi->ndev->stats.tx_bytes += skb->len; + cfhsi_update_aggregation_stats(cfhsi, skb, -1); + spin_unlock_bh(&cfhsi->lock); + + /* Copy in embedded CAIF frame. */ + skb_copy_bits(skb, 0, pemb, skb->len); + + /* Consume the SKB */ + consume_skb(skb); + skb = NULL; + } + } + + /* 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; + int tpad; + + if (!skb) + skb = cfhsi_dequeue(cfhsi); + + 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), cfhsi->cfg.head_align); + tpad = PAD_POW2((skb->len + hpad), cfhsi->cfg.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. */ + spin_lock_bh(&cfhsi->lock); + cfhsi->ndev->stats.tx_packets++; + cfhsi->ndev->stats.tx_bytes += skb->len; + cfhsi_update_aggregation_stats(cfhsi, skb, -1); + spin_unlock_bh(&cfhsi->lock); + + /* 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; + + /* Consume the SKB */ + 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. */ + if (cfhsi_can_send_aggregate(cfhsi)) + desc->header |= CFHSI_PIGGY_DESC; + else + desc->header &= ~CFHSI_PIGGY_DESC; + + return CFHSI_DESC_SZ + pld_len; +} + +static void cfhsi_start_tx(struct cfhsi *cfhsi) +{ + struct cfhsi_desc *desc = (struct cfhsi_desc *)cfhsi->tx_buf; + int len, res; + + netdev_dbg(cfhsi->ndev, "%s.\n", __func__); + + if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) + return; + + do { + /* Create HSI frame. */ + len = cfhsi_tx_frm(desc, cfhsi); + if (!len) { + spin_lock_bh(&cfhsi->lock); + if (unlikely(cfhsi_tx_queue_len(cfhsi))) { + spin_unlock_bh(&cfhsi->lock); + res = -EAGAIN; + continue; + } + cfhsi->tx_state = CFHSI_TX_STATE_IDLE; + /* Start inactivity timer. */ + mod_timer(&cfhsi->inactivity_timer, + jiffies + cfhsi->cfg.inactivity_timeout); + spin_unlock_bh(&cfhsi->lock); + break; + } + + /* Set up new transfer. */ + res = cfhsi->ops->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->ops); + if (WARN_ON(res < 0)) + netdev_err(cfhsi->ndev, "%s: TX error %d.\n", + __func__, res); + } while (res < 0); +} + +static void cfhsi_tx_done(struct cfhsi *cfhsi) +{ + netdev_dbg(cfhsi->ndev, "%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->cfg.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->cfg.aggregation_timeout); + spin_unlock_bh(&cfhsi->lock); + } + + return; +} + +static void cfhsi_tx_done_cb(struct cfhsi_cb_ops *cb_ops) +{ + struct cfhsi *cfhsi; + + cfhsi = container_of(cb_ops, struct cfhsi, cb_ops); + netdev_dbg(cfhsi->ndev, "%s.\n", + __func__); + + if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) + return; + cfhsi_tx_done(cfhsi); +} + +static int cfhsi_rx_desc(struct cfhsi_desc *desc, struct cfhsi *cfhsi) +{ + 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)) { + netdev_err(cfhsi->ndev, "%s: Invalid descriptor.\n", + __func__); + return -EPROTO; + } + + /* Check for embedded CAIF frame. */ + if (desc->offset) { + struct sk_buff *skb; + u8 *dst = NULL; + int len = 0; + 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. */ + + /* Sanity check length of CAIF frame. */ + if (unlikely(len > CFHSI_MAX_CAIF_FRAME_SZ)) { + netdev_err(cfhsi->ndev, "%s: Invalid length.\n", + __func__); + return -EPROTO; + } + + /* Allocate SKB (OK even in IRQ context). */ + skb = alloc_skb(len + 1, GFP_ATOMIC); + if (!skb) { + netdev_err(cfhsi->ndev, "%s: Out of memory !\n", + __func__); + return -ENOMEM; + } + 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 in a callback handler and + * 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; + + if ((xfer_sz % 4) || (xfer_sz > (CFHSI_BUF_SZ_RX - CFHSI_DESC_SZ))) { + netdev_err(cfhsi->ndev, + "%s: Invalid payload len: %d, ignored.\n", + __func__, xfer_sz); + return -EPROTO; + } + return xfer_sz; +} + +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; +} + +static int cfhsi_rx_pld(struct cfhsi_desc *desc, struct cfhsi *cfhsi) +{ + 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))) { + netdev_err(cfhsi->ndev, "%s: Invalid descriptor.\n", + __func__); + return -EPROTO; + } + + /* Set frame pointer to start of payload. */ + pfrm = desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ; + plen = desc->cffrm_len; + + /* Skip already processed frames. */ + while (nfrms < cfhsi->rx_state.nfrms) { + pfrm += *plen; + rx_sz += *plen; + plen++; + nfrms++; + } + + /* Parse payload. */ + while (nfrms < CFHSI_MAX_PKTS && *plen) { + struct sk_buff *skb; + u8 *dst = NULL; + u8 *pcffrm = NULL; + int len; + + /* 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. */ + + /* Sanity check length of CAIF frames. */ + if (unlikely(len > CFHSI_MAX_CAIF_FRAME_SZ)) { + netdev_err(cfhsi->ndev, "%s: Invalid length.\n", + __func__); + return -EPROTO; + } + + /* Allocate SKB (OK even in IRQ context). */ + skb = alloc_skb(len + 1, GFP_ATOMIC); + if (!skb) { + netdev_err(cfhsi->ndev, "%s: Out of memory !\n", + __func__); + cfhsi->rx_state.nfrms = nfrms; + return -ENOMEM; + } + 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 in callback from HSI + * 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; +} + +static void cfhsi_rx_done(struct cfhsi *cfhsi) +{ + int res; + int desc_pld_len = 0, rx_len, rx_state; + struct cfhsi_desc *desc = NULL; + u8 *rx_ptr, *rx_buf; + struct cfhsi_desc *piggy_desc = NULL; + + desc = (struct cfhsi_desc *)cfhsi->rx_buf; + + netdev_dbg(cfhsi->ndev, "%s\n", __func__); + + if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) + return; + + /* Update inactivity timer if pending. */ + spin_lock_bh(&cfhsi->lock); + mod_timer_pending(&cfhsi->inactivity_timer, + jiffies + cfhsi->cfg.inactivity_timeout); + spin_unlock_bh(&cfhsi->lock); + + if (cfhsi->rx_state.state == CFHSI_RX_STATE_DESC) { + desc_pld_len = cfhsi_rx_desc_len(desc); + + if (desc_pld_len < 0) + goto out_of_sync; + + 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; + } else { + rx_buf = cfhsi->rx_flip_buf; + + rx_len = CFHSI_DESC_SZ; + if (cfhsi->rx_state.pld_len > 0 && + (desc->header & CFHSI_PIGGY_DESC)) { + + piggy_desc = (struct cfhsi_desc *) + (desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ + + cfhsi->rx_state.pld_len); + + cfhsi->rx_state.piggy_desc = true; + + /* 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; + + if (desc_pld_len > 0) { + rx_len = desc_pld_len; + if (piggy_desc->header & CFHSI_PIGGY_DESC) + rx_len += CFHSI_DESC_SZ; + } + + /* + * Copy needed information from the piggy-backed + * descriptor to the descriptor in the start. + */ + memcpy(rx_buf, (u8 *)piggy_desc, + CFHSI_DESC_SHORT_SZ); + } + } + + if (desc_pld_len) { + rx_state = CFHSI_RX_STATE_PAYLOAD; + rx_ptr = rx_buf + CFHSI_DESC_SZ; + } else { + rx_state = CFHSI_RX_STATE_DESC; + rx_ptr = rx_buf; + rx_len = CFHSI_DESC_SZ; + } + + /* Initiate next read */ + if (test_bit(CFHSI_AWAKE, &cfhsi->bits)) { + /* Set up new transfer. */ + netdev_dbg(cfhsi->ndev, "%s: Start RX.\n", + __func__); + + res = cfhsi->ops->cfhsi_rx(rx_ptr, rx_len, + cfhsi->ops); + if (WARN_ON(res < 0)) { + netdev_err(cfhsi->ndev, "%s: RX error %d.\n", + __func__, res); + cfhsi->ndev->stats.rx_errors++; + cfhsi->ndev->stats.rx_dropped++; + } + } + + 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; + /* Mark no embedded frame after extracting it */ + piggy_desc->offset = 0; + } + } + + /* 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); + return; + +out_of_sync: + netdev_err(cfhsi->ndev, "%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); +} + +static void cfhsi_rx_slowpath(unsigned long arg) +{ + struct cfhsi *cfhsi = (struct cfhsi *)arg; + + netdev_dbg(cfhsi->ndev, "%s.\n", + __func__); + + cfhsi_rx_done(cfhsi); +} + +static void cfhsi_rx_done_cb(struct cfhsi_cb_ops *cb_ops) +{ + struct cfhsi *cfhsi; + + cfhsi = container_of(cb_ops, struct cfhsi, cb_ops); + netdev_dbg(cfhsi->ndev, "%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 + cfhsi_rx_done(cfhsi); +} + +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); + clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits); + return; + } + + /* Activate wake line. */ + cfhsi->ops->cfhsi_wake_up(cfhsi->ops); + + netdev_dbg(cfhsi->ndev, "%s: Start waiting.\n", + __func__); + + /* Wait for acknowledge. */ + ret = CFHSI_WAKE_TOUT; + ret = wait_event_interruptible_timeout(cfhsi->wake_up_wait, + test_and_clear_bit(CFHSI_WAKE_UP_ACK, + &cfhsi->bits), ret); + if (unlikely(ret < 0)) { + /* Interrupted by signal. */ + netdev_err(cfhsi->ndev, "%s: Signalled: %ld.\n", + __func__, ret); + + clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); + cfhsi->ops->cfhsi_wake_down(cfhsi->ops); + return; + } else if (!ret) { + bool ca_wake = false; + size_t fifo_occupancy = 0; + + /* Wakeup timeout */ + netdev_dbg(cfhsi->ndev, "%s: Timeout.\n", + __func__); + + /* Check FIFO to check if modem has sent something. */ + WARN_ON(cfhsi->ops->cfhsi_fifo_occupancy(cfhsi->ops, + &fifo_occupancy)); + + netdev_dbg(cfhsi->ndev, "%s: Bytes in FIFO: %u.\n", + __func__, (unsigned) fifo_occupancy); + + /* Check if we misssed the interrupt. */ + WARN_ON(cfhsi->ops->cfhsi_get_peer_wake(cfhsi->ops, + &ca_wake)); + + if (ca_wake) { + netdev_err(cfhsi->ndev, "%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; + } + + clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); + cfhsi->ops->cfhsi_wake_down(cfhsi->ops); + return; + } +wake_ack: + netdev_dbg(cfhsi->ndev, "%s: Woken.\n", + __func__); + + /* Clear power up bit. */ + set_bit(CFHSI_AWAKE, &cfhsi->bits); + clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); + + /* Resume read operation. */ + netdev_dbg(cfhsi->ndev, "%s: Start RX.\n", __func__); + res = cfhsi->ops->cfhsi_rx(cfhsi->rx_ptr, cfhsi->rx_len, cfhsi->ops); + + if (WARN_ON(res < 0)) + netdev_err(cfhsi->ndev, "%s: RX err %d.\n", __func__, res); + + /* Clear power up acknowledment. */ + clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits); + + spin_lock_bh(&cfhsi->lock); + + /* Resume transmit if queues are not empty. */ + if (!cfhsi_tx_queue_len(cfhsi)) { + netdev_dbg(cfhsi->ndev, "%s: Peer wake, start timer.\n", + __func__); + /* Start inactivity timer. */ + mod_timer(&cfhsi->inactivity_timer, + jiffies + cfhsi->cfg.inactivity_timeout); + spin_unlock_bh(&cfhsi->lock); + return; + } + + netdev_dbg(cfhsi->ndev, "%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->ops->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->ops); + if (WARN_ON(res < 0)) { + netdev_err(cfhsi->ndev, "%s: TX error %d.\n", + __func__, res); + cfhsi_abort_tx(cfhsi); + } + } else { + netdev_err(cfhsi->ndev, + "%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; + size_t fifo_occupancy = 0; + int retry = CFHSI_WAKE_TOUT; + + cfhsi = container_of(work, struct cfhsi, wake_down_work); + netdev_dbg(cfhsi->ndev, "%s.\n", __func__); + + if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) + return; + + /* Deactivate wake line. */ + cfhsi->ops->cfhsi_wake_down(cfhsi->ops); + + /* Wait for acknowledge. */ + ret = CFHSI_WAKE_TOUT; + ret = wait_event_interruptible_timeout(cfhsi->wake_down_wait, + test_and_clear_bit(CFHSI_WAKE_DOWN_ACK, + &cfhsi->bits), ret); + if (ret < 0) { + /* Interrupted by signal. */ + netdev_err(cfhsi->ndev, "%s: Signalled: %ld.\n", + __func__, ret); + return; + } else if (!ret) { + bool ca_wake = true; + + /* Timeout */ + netdev_err(cfhsi->ndev, "%s: Timeout.\n", __func__); + + /* Check if we misssed the interrupt. */ + WARN_ON(cfhsi->ops->cfhsi_get_peer_wake(cfhsi->ops, + &ca_wake)); + if (!ca_wake) + netdev_err(cfhsi->ndev, "%s: CA Wake missed !.\n", + __func__); + } + + /* Check FIFO occupancy. */ + while (retry) { + WARN_ON(cfhsi->ops->cfhsi_fifo_occupancy(cfhsi->ops, + &fifo_occupancy)); + + if (!fifo_occupancy) + break; + + set_current_state(TASK_INTERRUPTIBLE); + schedule_timeout(1); + retry--; + } + + if (!retry) + netdev_err(cfhsi->ndev, "%s: FIFO Timeout.\n", __func__); + + /* Clear AWAKE condition. */ + clear_bit(CFHSI_AWAKE, &cfhsi->bits); + + /* Cancel pending RX requests. */ + cfhsi->ops->cfhsi_rx_cancel(cfhsi->ops); +} + +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(); +} + +static void cfhsi_wake_up_cb(struct cfhsi_cb_ops *cb_ops) +{ + struct cfhsi *cfhsi = NULL; + + cfhsi = container_of(cb_ops, struct cfhsi, cb_ops); + netdev_dbg(cfhsi->ndev, "%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_cb_ops *cb_ops) +{ + struct cfhsi *cfhsi = NULL; + + cfhsi = container_of(cb_ops, struct cfhsi, cb_ops); + netdev_dbg(cfhsi->ndev, "%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); +} + +static void cfhsi_aggregation_tout(unsigned long arg) +{ + struct cfhsi *cfhsi = (struct cfhsi *)arg; + + netdev_dbg(cfhsi->ndev, "%s.\n", + __func__); + + cfhsi_start_tx(cfhsi); +} + +static int cfhsi_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct cfhsi *cfhsi = NULL; + int start_xfer = 0; + int timer_active; + int prio; + + if (!dev) + return -EINVAL; + + cfhsi = netdev_priv(dev); + + 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; + } + + spin_lock_bh(&cfhsi->lock); + + /* Update aggregation statistics */ + cfhsi_update_aggregation_stats(cfhsi, skb, 1); + + /* Queue the SKB */ + skb_queue_tail(&cfhsi->qhead[prio], skb); + + /* 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 && + cfhsi_tx_queue_len(cfhsi) > cfhsi->cfg.q_high_mark && + 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; + } + + if (!start_xfer) { + /* Send aggregate if it is possible */ + bool aggregate_ready = + cfhsi_can_send_aggregate(cfhsi) && + del_timer(&cfhsi->aggregation_timer) > 0; + spin_unlock_bh(&cfhsi->lock); + if (aggregate_ready) + cfhsi_start_tx(cfhsi); + return 0; + } + + /* Delete inactivity timer if started. */ + timer_active = del_timer_sync(&cfhsi->inactivity_timer); + + spin_unlock_bh(&cfhsi->lock); + + 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); + WARN_ON(!len); + + /* Set up new transfer. */ + res = cfhsi->ops->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->ops); + if (WARN_ON(res < 0)) { + netdev_err(cfhsi->ndev, "%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; +} + +static const struct net_device_ops cfhsi_netdevops; + +static void cfhsi_setup(struct net_device *dev) +{ + int i; + struct cfhsi *cfhsi = netdev_priv(dev); + dev->features = 0; + dev->type = ARPHRD_CAIF; + dev->flags = IFF_POINTOPOINT | IFF_NOARP; + dev->mtu = CFHSI_MAX_CAIF_FRAME_SZ; + dev->tx_queue_len = 0; + dev->destructor = free_netdev; + dev->netdev_ops = &cfhsi_netdevops; + for (i = 0; i < CFHSI_PRIO_LAST; ++i) + skb_queue_head_init(&cfhsi->qhead[i]); + 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; + cfhsi->cfg = hsi_default_config; +} + +static int cfhsi_open(struct net_device *ndev) +{ + struct cfhsi *cfhsi = netdev_priv(ndev); + int res; + + clear_bit(CFHSI_SHUTDOWN, &cfhsi->bits); + + /* Initialize state vaiables. */ + cfhsi->tx_state = CFHSI_TX_STATE_IDLE; + cfhsi->rx_state.state = CFHSI_RX_STATE_DESC; + + /* Set flow info */ + cfhsi->flow_off_sent = 0; + + /* + * 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; + } + + cfhsi->rx_flip_buf = kzalloc(CFHSI_BUF_SZ_RX, GFP_KERNEL); + if (!cfhsi->rx_flip_buf) { + res = -ENODEV; + goto err_alloc_rx_flip; + } + + /* Initialize aggregation timeout */ + cfhsi->cfg.aggregation_timeout = hsi_default_config.aggregation_timeout; + + /* Initialize recieve vaiables. */ + 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->cb_ops.tx_done_cb = cfhsi_tx_done_cb; + cfhsi->cb_ops.rx_done_cb = cfhsi_rx_done_cb; + cfhsi->cb_ops.wake_up_cb = cfhsi_wake_up_cb; + cfhsi->cb_ops.wake_down_cb = cfhsi_wake_down_cb; + + /* Initialize the work queues. */ + INIT_WORK(&cfhsi->wake_up_work, cfhsi_wake_up); + INIT_WORK(&cfhsi->wake_down_work, cfhsi_wake_down); + INIT_WORK(&cfhsi->out_of_sync_work, cfhsi_out_of_sync); + + /* 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. */ + cfhsi->wq = create_singlethread_workqueue(cfhsi->ndev->name); + if (!cfhsi->wq) { + netdev_err(cfhsi->ndev, "%s: Failed to create work queue.\n", + __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. */ + init_timer(&cfhsi->inactivity_timer); + cfhsi->inactivity_timer.data = (unsigned long)cfhsi; + cfhsi->inactivity_timer.function = cfhsi_inactivity_tout; + /* 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; + /* Setup the aggregation timer. */ + init_timer(&cfhsi->aggregation_timer); + cfhsi->aggregation_timer.data = (unsigned long)cfhsi; + cfhsi->aggregation_timer.function = cfhsi_aggregation_tout; + + /* Activate HSI interface. */ + res = cfhsi->ops->cfhsi_up(cfhsi->ops); + if (res) { + netdev_err(cfhsi->ndev, + "%s: can't activate HSI interface: %d.\n", + __func__, res); + goto err_activate; + } + + /* Flush FIFO */ + res = cfhsi_flush_fifo(cfhsi); + if (res) { + netdev_err(cfhsi->ndev, "%s: Can't flush FIFO: %d.\n", + __func__, res); + goto err_net_reg; + } + return res; + + err_net_reg: + cfhsi->ops->cfhsi_down(cfhsi->ops); + err_activate: + destroy_workqueue(cfhsi->wq); + err_create_wq: + kfree(cfhsi->rx_flip_buf); + err_alloc_rx_flip: + kfree(cfhsi->rx_buf); + err_alloc_rx: + kfree(cfhsi->tx_buf); + err_alloc_tx: + return res; +} + +static int cfhsi_close(struct net_device *ndev) +{ + struct cfhsi *cfhsi = netdev_priv(ndev); + u8 *tx_buf, *rx_buf, *flip_buf; + + /* going to shutdown driver */ + set_bit(CFHSI_SHUTDOWN, &cfhsi->bits); + + /* Flush workqueue */ + flush_workqueue(cfhsi->wq); + + /* Delete timers if pending */ + del_timer_sync(&cfhsi->inactivity_timer); + del_timer_sync(&cfhsi->rx_slowpath_timer); + del_timer_sync(&cfhsi->aggregation_timer); + + /* Cancel pending RX request (if any) */ + cfhsi->ops->cfhsi_rx_cancel(cfhsi->ops); + + /* Destroy workqueue */ + destroy_workqueue(cfhsi->wq); + + /* Store bufferes: will be freed later. */ + tx_buf = cfhsi->tx_buf; + rx_buf = cfhsi->rx_buf; + flip_buf = cfhsi->rx_flip_buf; + /* Flush transmit queues. */ + cfhsi_abort_tx(cfhsi); + + /* Deactivate interface */ + cfhsi->ops->cfhsi_down(cfhsi->ops); + + /* Free buffers. */ + kfree(tx_buf); + kfree(rx_buf); + kfree(flip_buf); + return 0; +} + +static void cfhsi_uninit(struct net_device *dev) +{ + struct cfhsi *cfhsi = netdev_priv(dev); + ASSERT_RTNL(); + symbol_put(cfhsi_get_device); + list_del(&cfhsi->list); +} + +static const struct net_device_ops cfhsi_netdevops = { + .ndo_uninit = cfhsi_uninit, + .ndo_open = cfhsi_open, + .ndo_stop = cfhsi_close, + .ndo_start_xmit = cfhsi_xmit +}; + +static void cfhsi_netlink_parms(struct nlattr *data[], struct cfhsi *cfhsi) +{ + int i; + + if (!data) { + pr_debug("no params data found\n"); + return; + } + + i = __IFLA_CAIF_HSI_INACTIVITY_TOUT; + /* + * Inactivity timeout in millisecs. Lowest possible value is 1, + * and highest possible is NEXT_TIMER_MAX_DELTA. + */ + if (data[i]) { + u32 inactivity_timeout = nla_get_u32(data[i]); + /* Pre-calculate inactivity timeout. */ + cfhsi->cfg.inactivity_timeout = inactivity_timeout * HZ / 1000; + if (cfhsi->cfg.inactivity_timeout == 0) + cfhsi->cfg.inactivity_timeout = 1; + else if (cfhsi->cfg.inactivity_timeout > NEXT_TIMER_MAX_DELTA) + cfhsi->cfg.inactivity_timeout = NEXT_TIMER_MAX_DELTA; + } + + i = __IFLA_CAIF_HSI_AGGREGATION_TOUT; + if (data[i]) + cfhsi->cfg.aggregation_timeout = nla_get_u32(data[i]); + + i = __IFLA_CAIF_HSI_HEAD_ALIGN; + if (data[i]) + cfhsi->cfg.head_align = nla_get_u32(data[i]); + + i = __IFLA_CAIF_HSI_TAIL_ALIGN; + if (data[i]) + cfhsi->cfg.tail_align = nla_get_u32(data[i]); + + i = __IFLA_CAIF_HSI_QHIGH_WATERMARK; + if (data[i]) + cfhsi->cfg.q_high_mark = nla_get_u32(data[i]); + + i = __IFLA_CAIF_HSI_QLOW_WATERMARK; + if (data[i]) + cfhsi->cfg.q_low_mark = nla_get_u32(data[i]); +} + +static int caif_hsi_changelink(struct net_device *dev, struct nlattr *tb[], + struct nlattr *data[]) +{ + cfhsi_netlink_parms(data, netdev_priv(dev)); + netdev_state_change(dev); + return 0; +} + +static const struct nla_policy caif_hsi_policy[__IFLA_CAIF_HSI_MAX + 1] = { + [__IFLA_CAIF_HSI_INACTIVITY_TOUT] = { .type = NLA_U32, .len = 4 }, + [__IFLA_CAIF_HSI_AGGREGATION_TOUT] = { .type = NLA_U32, .len = 4 }, + [__IFLA_CAIF_HSI_HEAD_ALIGN] = { .type = NLA_U32, .len = 4 }, + [__IFLA_CAIF_HSI_TAIL_ALIGN] = { .type = NLA_U32, .len = 4 }, + [__IFLA_CAIF_HSI_QHIGH_WATERMARK] = { .type = NLA_U32, .len = 4 }, + [__IFLA_CAIF_HSI_QLOW_WATERMARK] = { .type = NLA_U32, .len = 4 }, +}; + +static size_t caif_hsi_get_size(const struct net_device *dev) +{ + int i; + size_t s = 0; + for (i = __IFLA_CAIF_HSI_UNSPEC + 1; i < __IFLA_CAIF_HSI_MAX; i++) + s += nla_total_size(caif_hsi_policy[i].len); + return s; +} + +static int caif_hsi_fill_info(struct sk_buff *skb, const struct net_device *dev) +{ + struct cfhsi *cfhsi = netdev_priv(dev); + + if (nla_put_u32(skb, __IFLA_CAIF_HSI_INACTIVITY_TOUT, + cfhsi->cfg.inactivity_timeout) || + nla_put_u32(skb, __IFLA_CAIF_HSI_AGGREGATION_TOUT, + cfhsi->cfg.aggregation_timeout) || + nla_put_u32(skb, __IFLA_CAIF_HSI_HEAD_ALIGN, + cfhsi->cfg.head_align) || + nla_put_u32(skb, __IFLA_CAIF_HSI_TAIL_ALIGN, + cfhsi->cfg.tail_align) || + nla_put_u32(skb, __IFLA_CAIF_HSI_QHIGH_WATERMARK, + cfhsi->cfg.q_high_mark) || + nla_put_u32(skb, __IFLA_CAIF_HSI_QLOW_WATERMARK, + cfhsi->cfg.q_low_mark)) + return -EMSGSIZE; + + return 0; +} + +static int caif_hsi_newlink(struct net *src_net, struct net_device *dev, + struct nlattr *tb[], struct nlattr *data[]) +{ + struct cfhsi *cfhsi = NULL; + struct cfhsi_ops *(*get_ops)(void); + + ASSERT_RTNL(); + + cfhsi = netdev_priv(dev); + cfhsi_netlink_parms(data, cfhsi); + + get_ops = symbol_get(cfhsi_get_ops); + if (!get_ops) { + pr_err("%s: failed to get the cfhsi_ops\n", __func__); + return -ENODEV; + } + + /* Assign the HSI device. */ + cfhsi->ops = (*get_ops)(); + if (!cfhsi->ops) { + pr_err("%s: failed to get the cfhsi_ops\n", __func__); + goto err; + } + + /* Assign the driver to this HSI device. */ + cfhsi->ops->cb_ops = &cfhsi->cb_ops; + if (register_netdevice(dev)) { + pr_warn("%s: caif_hsi device registration failed\n", __func__); + goto err; + } + /* Add CAIF HSI device to list. */ + list_add_tail(&cfhsi->list, &cfhsi_list); + + return 0; +err: + symbol_put(cfhsi_get_ops); + return -ENODEV; +} + +static struct rtnl_link_ops caif_hsi_link_ops __read_mostly = { + .kind = "cfhsi", + .priv_size = sizeof(struct cfhsi), + .setup = cfhsi_setup, + .maxtype = __IFLA_CAIF_HSI_MAX, + .policy = caif_hsi_policy, + .newlink = caif_hsi_newlink, + .changelink = caif_hsi_changelink, + .get_size = caif_hsi_get_size, + .fill_info = caif_hsi_fill_info, +}; + +static void __exit cfhsi_exit_module(void) +{ + struct list_head *list_node; + struct list_head *n; + struct cfhsi *cfhsi; + + rtnl_link_unregister(&caif_hsi_link_ops); + + rtnl_lock(); + list_for_each_safe(list_node, n, &cfhsi_list) { + cfhsi = list_entry(list_node, struct cfhsi, list); + unregister_netdev(cfhsi->ndev); + } + rtnl_unlock(); +} + +static int __init cfhsi_init_module(void) +{ + return rtnl_link_register(&caif_hsi_link_ops); +} + +module_init(cfhsi_init_module); +module_exit(cfhsi_exit_module); |