| /* |
| * 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. |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME fmt |
| |
| #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> |
| #include <linux/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<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))))) |
| |
| static int inactivity_timeout = 1000; |
| module_param(inactivity_timeout, int, S_IRUGO | S_IWUSR); |
| MODULE_PARM_DESC(inactivity_timeout, "Inactivity timeout on HSI, ms."); |
| |
| static int aggregation_timeout = 1; |
| module_param(aggregation_timeout, int, S_IRUGO | S_IWUSR); |
| MODULE_PARM_DESC(aggregation_timeout, "Aggregation timeout on HSI, ms."); |
| |
| /* |
| * 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); |
| } |
| |
| 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; |
| } |
| |
| 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->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; |
| |
| 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; |
| ret = wait_event_interruptible_timeout(cfhsi->flush_fifo_wait, |
| !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; |
| |
| 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 = 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. */ |
| 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 = 0; |
| int tpad = 0; |
| |
| 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), 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. */ |
| 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; |
| |
| dev_dbg(&cfhsi->ndev->dev, "%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->inactivity_timeout); |
| spin_unlock_bh(&cfhsi->lock); |
| break; |
| } |
| |
| /* 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); |
| } while (res < 0); |
| } |
| |
| 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); |
| } |
| |
| return; |
| } |
| |
| 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; |
| 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)) { |
| dev_err(&cfhsi->ndev->dev, "%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)) { |
| dev_err(&cfhsi->ndev->dev, "%s: Invalid length.\n", |
| __func__); |
| return -EPROTO; |
| } |
| |
| /* Allocate SKB (OK even in IRQ context). */ |
| skb = alloc_skb(len + 1, GFP_ATOMIC); |
| if (!skb) { |
| dev_err(&cfhsi->ndev->dev, "%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 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; |
| |
| if ((xfer_sz % 4) || (xfer_sz > (CFHSI_BUF_SZ_RX - CFHSI_DESC_SZ))) { |
| dev_err(&cfhsi->ndev->dev, |
| "%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))) { |
| dev_err(&cfhsi->ndev->dev, "%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 = 0; |
| |
| /* 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)) { |
| dev_err(&cfhsi->ndev->dev, "%s: Invalid length.\n", |
| __func__); |
| return -EPROTO; |
| } |
| |
| /* Allocate SKB (OK even in IRQ context). */ |
| 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; |
| } |
| 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; |
| } |
| |
| 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; |
| |
| dev_dbg(&cfhsi->ndev->dev, "%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->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 (desc_pld_len > 0 && |
| (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 == -EPROTO) |
| goto out_of_sync; |
| } |
| } |
| |
| 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. */ |
| dev_dbg(&cfhsi->ndev->dev, "%s: Start RX.\n", |
| __func__); |
| |
| res = cfhsi->dev->cfhsi_rx(rx_ptr, rx_len, |
| 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++; |
| } |
| } |
| |
| 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: |
| 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); |
| } |
| |
| 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); |
| } |
| |
| 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 |
| 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->dev->cfhsi_wake_up(cfhsi->dev); |
| |
| dev_dbg(&cfhsi->ndev->dev, "%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. */ |
| dev_err(&cfhsi->ndev->dev, "%s: Signalled: %ld.\n", |
| __func__, ret); |
| |
| clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); |
| cfhsi->dev->cfhsi_wake_down(cfhsi->dev); |
| return; |
| } else if (!ret) { |
| bool ca_wake = false; |
| size_t fifo_occupancy = 0; |
| |
| /* Wakeup timeout */ |
| dev_dbg(&cfhsi->ndev->dev, "%s: Timeout.\n", |
| __func__); |
| |
| /* Check FIFO to check if modem has sent something. */ |
| WARN_ON(cfhsi->dev->cfhsi_fifo_occupancy(cfhsi->dev, |
| &fifo_occupancy)); |
| |
| dev_dbg(&cfhsi->ndev->dev, "%s: Bytes in FIFO: %u.\n", |
| __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; |
| } |
| |
| clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); |
| cfhsi->dev->cfhsi_wake_down(cfhsi->dev); |
| return; |
| } |
| wake_ack: |
| 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. */ |
| 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); |
| |
| /* 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)) { |
| dev_dbg(&cfhsi->ndev->dev, "%s: Peer wake, start timer.\n", |
| __func__); |
| /* Start inactivity timer. */ |
| mod_timer(&cfhsi->inactivity_timer, |
| jiffies + cfhsi->inactivity_timeout); |
| 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; |
| size_t fifo_occupancy = 0; |
| int retry = CFHSI_WAKE_TOUT; |
| |
| cfhsi = container_of(work, struct cfhsi, wake_down_work); |
| dev_dbg(&cfhsi->ndev->dev, "%s.\n", __func__); |
| |
| if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) |
| return; |
| |
| /* Deactivate wake line. */ |
| cfhsi->dev->cfhsi_wake_down(cfhsi->dev); |
| |
| /* 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. */ |
| dev_err(&cfhsi->ndev->dev, "%s: Signalled: %ld.\n", |
| __func__, ret); |
| return; |
| } else if (!ret) { |
| bool ca_wake = true; |
| |
| /* Timeout */ |
| dev_err(&cfhsi->ndev->dev, "%s: Timeout.\n", __func__); |
| |
| /* 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__); |
| } |
| |
| /* 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. */ |
| clear_bit(CFHSI_AWAKE, &cfhsi->bits); |
| |
| /* Cancel pending RX requests. */ |
| cfhsi->dev->cfhsi_rx_cancel(cfhsi->dev); |
| |
| } |
| |
| 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_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); |
| } |
| |
| 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); |
| } |
| |
| 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->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->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; |
| } |
| |
| static const struct net_device_ops cfhsi_ops; |
| |
| static void cfhsi_setup(struct net_device *dev) |
| { |
| int i; |
| struct cfhsi *cfhsi = netdev_priv(dev); |
| dev->features = 0; |
| dev->netdev_ops = &cfhsi_ops; |
| 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; |
| 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; |
| } |
| |
| int cfhsi_probe(struct platform_device *pdev) |
| { |
| struct cfhsi *cfhsi = NULL; |
| struct net_device *ndev; |
| |
| int res; |
| |
| ndev = alloc_netdev(sizeof(struct cfhsi), "cfhsi%d", cfhsi_setup); |
| if (!ndev) |
| return -ENODEV; |
| |
| cfhsi = netdev_priv(ndev); |
| cfhsi->ndev = ndev; |
| cfhsi->pdev = pdev; |
| |
| /* 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); |
| return -ENODEV; |
| } |
| /* 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); |
| |
| /* 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; |
| 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; |
| } |
| |
| cfhsi->rx_flip_buf = kzalloc(CFHSI_BUF_SZ_RX, GFP_KERNEL); |
| if (!cfhsi->rx_flip_buf) { |
| res = -ENODEV; |
| goto err_alloc_rx_flip; |
| } |
| |
| /* 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; |
| } |
| |
| /* Initialize aggregation timeout */ |
| cfhsi->aggregation_timeout = 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->drv.tx_done_cb = cfhsi_tx_done_cb; |
| cfhsi->drv.rx_done_cb = cfhsi_rx_done_cb; |
| cfhsi->drv.wake_up_cb = cfhsi_wake_up_cb; |
| cfhsi->drv.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->pdev->name); |
| if (!cfhsi->wq) { |
| dev_err(&cfhsi->ndev->dev, "%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->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) { |
| dev_err(&cfhsi->ndev->dev, "%s: Can't flush FIFO: %d.\n", |
| __func__, res); |
| goto err_net_reg; |
| } |
| return res; |
| |
| err_net_reg: |
| cfhsi->dev->cfhsi_down(cfhsi->dev); |
| 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->dev->cfhsi_rx_cancel(cfhsi->dev); |
| |
| /* 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->dev->cfhsi_down(cfhsi->dev); |
| |
| /* Free buffers. */ |
| kfree(tx_buf); |
| kfree(rx_buf); |
| kfree(flip_buf); |
| return 0; |
| } |
| |
| static const struct net_device_ops cfhsi_ops = { |
| .ndo_open = cfhsi_open, |
| .ndo_stop = cfhsi_close, |
| .ndo_start_xmit = cfhsi_xmit |
| }; |
| |
| int cfhsi_remove(struct platform_device *pdev) |
| { |
| struct list_head *list_node; |
| struct list_head *n; |
| struct cfhsi *cfhsi = NULL; |
| struct cfhsi_dev *dev; |
| |
| dev = (struct cfhsi_dev *)pdev->dev.platform_data; |
| spin_lock(&cfhsi_list_lock); |
| list_for_each_safe(list_node, n, &cfhsi_list) { |
| cfhsi = list_entry(list_node, struct cfhsi, list); |
| /* Find the corresponding device. */ |
| if (cfhsi->dev == dev) { |
| /* Remove from list. */ |
| list_del(list_node); |
| spin_unlock(&cfhsi_list_lock); |
| return 0; |
| } |
| } |
| spin_unlock(&cfhsi_list_lock); |
| return -ENODEV; |
| } |
| |
| struct platform_driver cfhsi_plat_drv = { |
| .probe = cfhsi_probe, |
| .remove = cfhsi_remove, |
| .driver = { |
| .name = "cfhsi", |
| .owner = THIS_MODULE, |
| }, |
| }; |
| |
| static void __exit cfhsi_exit_module(void) |
| { |
| struct list_head *list_node; |
| struct list_head *n; |
| struct cfhsi *cfhsi = NULL; |
| |
| spin_lock(&cfhsi_list_lock); |
| list_for_each_safe(list_node, n, &cfhsi_list) { |
| cfhsi = list_entry(list_node, struct cfhsi, list); |
| |
| /* Remove from list. */ |
| list_del(list_node); |
| spin_unlock(&cfhsi_list_lock); |
| |
| unregister_netdevice(cfhsi->ndev); |
| |
| spin_lock(&cfhsi_list_lock); |
| } |
| spin_unlock(&cfhsi_list_lock); |
| |
| /* Unregister platform driver. */ |
| platform_driver_unregister(&cfhsi_plat_drv); |
| } |
| |
| static int __init cfhsi_init_module(void) |
| { |
| int result; |
| |
| /* Initialize spin lock. */ |
| spin_lock_init(&cfhsi_list_lock); |
| |
| /* Register platform driver. */ |
| result = platform_driver_register(&cfhsi_plat_drv); |
| if (result) { |
| printk(KERN_ERR "Could not register platform HSI driver: %d.\n", |
| result); |
| goto err_dev_register; |
| } |
| |
| err_dev_register: |
| return result; |
| } |
| |
| module_init(cfhsi_init_module); |
| module_exit(cfhsi_exit_module); |