blob: c5e7ca793c43311911e9f7cf0a1c36215a6a641e [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Freescale QMC HDLC Device Driver
*
* Copyright 2023 CS GROUP France
*
* Author: Herve Codina <herve.codina@bootlin.com>
*/
#include <linux/array_size.h>
#include <linux/bug.h>
#include <linux/cleanup.h>
#include <linux/bitmap.h>
#include <linux/dma-mapping.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/framer/framer.h>
#include <linux/hdlc.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <soc/fsl/qe/qmc.h>
struct qmc_hdlc_desc {
struct net_device *netdev;
struct sk_buff *skb; /* NULL if the descriptor is not in use */
dma_addr_t dma_addr;
size_t dma_size;
};
struct qmc_hdlc {
struct device *dev;
struct qmc_chan *qmc_chan;
struct net_device *netdev;
struct framer *framer;
spinlock_t carrier_lock; /* Protect carrier detection */
struct notifier_block nb;
bool is_crc32;
spinlock_t tx_lock; /* Protect tx descriptors */
struct qmc_hdlc_desc tx_descs[8];
unsigned int tx_out;
struct qmc_hdlc_desc rx_descs[4];
u32 slot_map;
};
static struct qmc_hdlc *netdev_to_qmc_hdlc(struct net_device *netdev)
{
return dev_to_hdlc(netdev)->priv;
}
static int qmc_hdlc_framer_set_carrier(struct qmc_hdlc *qmc_hdlc)
{
struct framer_status framer_status;
int ret;
if (!qmc_hdlc->framer)
return 0;
guard(spinlock_irqsave)(&qmc_hdlc->carrier_lock);
ret = framer_get_status(qmc_hdlc->framer, &framer_status);
if (ret) {
dev_err(qmc_hdlc->dev, "get framer status failed (%d)\n", ret);
return ret;
}
if (framer_status.link_is_on)
netif_carrier_on(qmc_hdlc->netdev);
else
netif_carrier_off(qmc_hdlc->netdev);
return 0;
}
static int qmc_hdlc_framer_notifier(struct notifier_block *nb, unsigned long action,
void *data)
{
struct qmc_hdlc *qmc_hdlc = container_of(nb, struct qmc_hdlc, nb);
int ret;
if (action != FRAMER_EVENT_STATUS)
return NOTIFY_DONE;
ret = qmc_hdlc_framer_set_carrier(qmc_hdlc);
return ret ? NOTIFY_DONE : NOTIFY_OK;
}
static int qmc_hdlc_framer_start(struct qmc_hdlc *qmc_hdlc)
{
struct framer_status framer_status;
int ret;
if (!qmc_hdlc->framer)
return 0;
ret = framer_power_on(qmc_hdlc->framer);
if (ret) {
dev_err(qmc_hdlc->dev, "framer power-on failed (%d)\n", ret);
return ret;
}
/* Be sure that get_status is supported */
ret = framer_get_status(qmc_hdlc->framer, &framer_status);
if (ret) {
dev_err(qmc_hdlc->dev, "get framer status failed (%d)\n", ret);
goto framer_power_off;
}
qmc_hdlc->nb.notifier_call = qmc_hdlc_framer_notifier;
ret = framer_notifier_register(qmc_hdlc->framer, &qmc_hdlc->nb);
if (ret) {
dev_err(qmc_hdlc->dev, "framer notifier register failed (%d)\n", ret);
goto framer_power_off;
}
return 0;
framer_power_off:
framer_power_off(qmc_hdlc->framer);
return ret;
}
static void qmc_hdlc_framer_stop(struct qmc_hdlc *qmc_hdlc)
{
if (!qmc_hdlc->framer)
return;
framer_notifier_unregister(qmc_hdlc->framer, &qmc_hdlc->nb);
framer_power_off(qmc_hdlc->framer);
}
static int qmc_hdlc_framer_set_iface(struct qmc_hdlc *qmc_hdlc, int if_iface,
const te1_settings *te1)
{
struct framer_config config;
int ret;
if (!qmc_hdlc->framer)
return 0;
ret = framer_get_config(qmc_hdlc->framer, &config);
if (ret)
return ret;
switch (if_iface) {
case IF_IFACE_E1:
config.iface = FRAMER_IFACE_E1;
break;
case IF_IFACE_T1:
config.iface = FRAMER_IFACE_T1;
break;
default:
return -EINVAL;
}
switch (te1->clock_type) {
case CLOCK_DEFAULT:
/* Keep current value */
break;
case CLOCK_EXT:
config.clock_type = FRAMER_CLOCK_EXT;
break;
case CLOCK_INT:
config.clock_type = FRAMER_CLOCK_INT;
break;
default:
return -EINVAL;
}
config.line_clock_rate = te1->clock_rate;
return framer_set_config(qmc_hdlc->framer, &config);
}
static int qmc_hdlc_framer_get_iface(struct qmc_hdlc *qmc_hdlc, int *if_iface, te1_settings *te1)
{
struct framer_config config;
int ret;
if (!qmc_hdlc->framer) {
*if_iface = IF_IFACE_E1;
return 0;
}
ret = framer_get_config(qmc_hdlc->framer, &config);
if (ret)
return ret;
switch (config.iface) {
case FRAMER_IFACE_E1:
*if_iface = IF_IFACE_E1;
break;
case FRAMER_IFACE_T1:
*if_iface = IF_IFACE_T1;
break;
}
if (!te1)
return 0; /* Only iface type requested */
switch (config.clock_type) {
case FRAMER_CLOCK_EXT:
te1->clock_type = CLOCK_EXT;
break;
case FRAMER_CLOCK_INT:
te1->clock_type = CLOCK_INT;
break;
default:
return -EINVAL;
}
te1->clock_rate = config.line_clock_rate;
return 0;
}
static int qmc_hdlc_framer_init(struct qmc_hdlc *qmc_hdlc)
{
int ret;
if (!qmc_hdlc->framer)
return 0;
ret = framer_init(qmc_hdlc->framer);
if (ret) {
dev_err(qmc_hdlc->dev, "framer init failed (%d)\n", ret);
return ret;
}
return 0;
}
static void qmc_hdlc_framer_exit(struct qmc_hdlc *qmc_hdlc)
{
if (!qmc_hdlc->framer)
return;
framer_exit(qmc_hdlc->framer);
}
static int qmc_hdlc_recv_queue(struct qmc_hdlc *qmc_hdlc, struct qmc_hdlc_desc *desc, size_t size);
#define QMC_HDLC_RX_ERROR_FLAGS \
(QMC_RX_FLAG_HDLC_OVF | QMC_RX_FLAG_HDLC_UNA | \
QMC_RX_FLAG_HDLC_CRC | QMC_RX_FLAG_HDLC_ABORT)
static void qmc_hcld_recv_complete(void *context, size_t length, unsigned int flags)
{
struct qmc_hdlc_desc *desc = context;
struct net_device *netdev;
struct qmc_hdlc *qmc_hdlc;
int ret;
netdev = desc->netdev;
qmc_hdlc = netdev_to_qmc_hdlc(netdev);
dma_unmap_single(qmc_hdlc->dev, desc->dma_addr, desc->dma_size, DMA_FROM_DEVICE);
if (flags & QMC_HDLC_RX_ERROR_FLAGS) {
netdev->stats.rx_errors++;
if (flags & QMC_RX_FLAG_HDLC_OVF) /* Data overflow */
netdev->stats.rx_over_errors++;
if (flags & QMC_RX_FLAG_HDLC_UNA) /* bits received not multiple of 8 */
netdev->stats.rx_frame_errors++;
if (flags & QMC_RX_FLAG_HDLC_ABORT) /* Received an abort sequence */
netdev->stats.rx_frame_errors++;
if (flags & QMC_RX_FLAG_HDLC_CRC) /* CRC error */
netdev->stats.rx_crc_errors++;
kfree_skb(desc->skb);
} else {
netdev->stats.rx_packets++;
netdev->stats.rx_bytes += length;
skb_put(desc->skb, length);
desc->skb->protocol = hdlc_type_trans(desc->skb, netdev);
netif_rx(desc->skb);
}
/* Re-queue a transfer using the same descriptor */
ret = qmc_hdlc_recv_queue(qmc_hdlc, desc, desc->dma_size);
if (ret) {
dev_err(qmc_hdlc->dev, "queue recv desc failed (%d)\n", ret);
netdev->stats.rx_errors++;
}
}
static int qmc_hdlc_recv_queue(struct qmc_hdlc *qmc_hdlc, struct qmc_hdlc_desc *desc, size_t size)
{
int ret;
desc->skb = dev_alloc_skb(size);
if (!desc->skb)
return -ENOMEM;
desc->dma_size = size;
desc->dma_addr = dma_map_single(qmc_hdlc->dev, desc->skb->data,
desc->dma_size, DMA_FROM_DEVICE);
ret = dma_mapping_error(qmc_hdlc->dev, desc->dma_addr);
if (ret)
goto free_skb;
ret = qmc_chan_read_submit(qmc_hdlc->qmc_chan, desc->dma_addr, desc->dma_size,
qmc_hcld_recv_complete, desc);
if (ret)
goto dma_unmap;
return 0;
dma_unmap:
dma_unmap_single(qmc_hdlc->dev, desc->dma_addr, desc->dma_size, DMA_FROM_DEVICE);
free_skb:
kfree_skb(desc->skb);
desc->skb = NULL;
return ret;
}
static void qmc_hdlc_xmit_complete(void *context)
{
struct qmc_hdlc_desc *desc = context;
struct net_device *netdev;
struct qmc_hdlc *qmc_hdlc;
struct sk_buff *skb;
netdev = desc->netdev;
qmc_hdlc = netdev_to_qmc_hdlc(netdev);
scoped_guard(spinlock_irqsave, &qmc_hdlc->tx_lock) {
dma_unmap_single(qmc_hdlc->dev, desc->dma_addr, desc->dma_size, DMA_TO_DEVICE);
skb = desc->skb;
desc->skb = NULL; /* Release the descriptor */
if (netif_queue_stopped(netdev))
netif_wake_queue(netdev);
}
netdev->stats.tx_packets++;
netdev->stats.tx_bytes += skb->len;
dev_consume_skb_any(skb);
}
static int qmc_hdlc_xmit_queue(struct qmc_hdlc *qmc_hdlc, struct qmc_hdlc_desc *desc)
{
int ret;
desc->dma_addr = dma_map_single(qmc_hdlc->dev, desc->skb->data,
desc->dma_size, DMA_TO_DEVICE);
ret = dma_mapping_error(qmc_hdlc->dev, desc->dma_addr);
if (ret) {
dev_err(qmc_hdlc->dev, "failed to map skb\n");
return ret;
}
ret = qmc_chan_write_submit(qmc_hdlc->qmc_chan, desc->dma_addr, desc->dma_size,
qmc_hdlc_xmit_complete, desc);
if (ret) {
dma_unmap_single(qmc_hdlc->dev, desc->dma_addr, desc->dma_size, DMA_TO_DEVICE);
dev_err(qmc_hdlc->dev, "qmc chan write returns %d\n", ret);
return ret;
}
return 0;
}
static netdev_tx_t qmc_hdlc_xmit(struct sk_buff *skb, struct net_device *netdev)
{
struct qmc_hdlc *qmc_hdlc = netdev_to_qmc_hdlc(netdev);
struct qmc_hdlc_desc *desc;
int err;
guard(spinlock_irqsave)(&qmc_hdlc->tx_lock);
desc = &qmc_hdlc->tx_descs[qmc_hdlc->tx_out];
if (WARN_ONCE(desc->skb, "No tx descriptors available\n")) {
/* Should never happen.
* Previous xmit should have already stopped the queue.
*/
netif_stop_queue(netdev);
return NETDEV_TX_BUSY;
}
desc->netdev = netdev;
desc->dma_size = skb->len;
desc->skb = skb;
err = qmc_hdlc_xmit_queue(qmc_hdlc, desc);
if (err) {
desc->skb = NULL; /* Release the descriptor */
if (err == -EBUSY) {
netif_stop_queue(netdev);
return NETDEV_TX_BUSY;
}
dev_kfree_skb(skb);
netdev->stats.tx_dropped++;
return NETDEV_TX_OK;
}
qmc_hdlc->tx_out = (qmc_hdlc->tx_out + 1) % ARRAY_SIZE(qmc_hdlc->tx_descs);
if (qmc_hdlc->tx_descs[qmc_hdlc->tx_out].skb)
netif_stop_queue(netdev);
return NETDEV_TX_OK;
}
static int qmc_hdlc_xlate_slot_map(struct qmc_hdlc *qmc_hdlc,
u32 slot_map, struct qmc_chan_ts_info *ts_info)
{
DECLARE_BITMAP(ts_mask_avail, 64);
DECLARE_BITMAP(ts_mask, 64);
DECLARE_BITMAP(map, 64);
/* Tx and Rx available masks must be identical */
if (ts_info->rx_ts_mask_avail != ts_info->tx_ts_mask_avail) {
dev_err(qmc_hdlc->dev, "tx and rx available timeslots mismatch (0x%llx, 0x%llx)\n",
ts_info->rx_ts_mask_avail, ts_info->tx_ts_mask_avail);
return -EINVAL;
}
bitmap_from_u64(ts_mask_avail, ts_info->rx_ts_mask_avail);
bitmap_from_u64(map, slot_map);
bitmap_scatter(ts_mask, map, ts_mask_avail, 64);
if (bitmap_weight(ts_mask, 64) != bitmap_weight(map, 64)) {
dev_err(qmc_hdlc->dev, "Cannot translate timeslots %64pb -> (%64pb, %64pb)\n",
map, ts_mask_avail, ts_mask);
return -EINVAL;
}
bitmap_to_arr64(&ts_info->tx_ts_mask, ts_mask, 64);
ts_info->rx_ts_mask = ts_info->tx_ts_mask;
return 0;
}
static int qmc_hdlc_xlate_ts_info(struct qmc_hdlc *qmc_hdlc,
const struct qmc_chan_ts_info *ts_info, u32 *slot_map)
{
DECLARE_BITMAP(ts_mask_avail, 64);
DECLARE_BITMAP(ts_mask, 64);
DECLARE_BITMAP(map, 64);
u32 slot_array[2];
/* Tx and Rx masks and available masks must be identical */
if (ts_info->rx_ts_mask_avail != ts_info->tx_ts_mask_avail) {
dev_err(qmc_hdlc->dev, "tx and rx available timeslots mismatch (0x%llx, 0x%llx)\n",
ts_info->rx_ts_mask_avail, ts_info->tx_ts_mask_avail);
return -EINVAL;
}
if (ts_info->rx_ts_mask != ts_info->tx_ts_mask) {
dev_err(qmc_hdlc->dev, "tx and rx timeslots mismatch (0x%llx, 0x%llx)\n",
ts_info->rx_ts_mask, ts_info->tx_ts_mask);
return -EINVAL;
}
bitmap_from_u64(ts_mask_avail, ts_info->rx_ts_mask_avail);
bitmap_from_u64(ts_mask, ts_info->rx_ts_mask);
bitmap_gather(map, ts_mask, ts_mask_avail, 64);
if (bitmap_weight(ts_mask, 64) != bitmap_weight(map, 64)) {
dev_err(qmc_hdlc->dev, "Cannot translate timeslots (%64pb, %64pb) -> %64pb\n",
ts_mask_avail, ts_mask, map);
return -EINVAL;
}
bitmap_to_arr32(slot_array, map, 64);
if (slot_array[1]) {
dev_err(qmc_hdlc->dev, "Slot map out of 32bit (%64pb, %64pb) -> %64pb\n",
ts_mask_avail, ts_mask, map);
return -EINVAL;
}
*slot_map = slot_array[0];
return 0;
}
static int qmc_hdlc_set_iface(struct qmc_hdlc *qmc_hdlc, int if_iface, const te1_settings *te1)
{
struct qmc_chan_ts_info ts_info;
int ret;
ret = qmc_chan_get_ts_info(qmc_hdlc->qmc_chan, &ts_info);
if (ret) {
dev_err(qmc_hdlc->dev, "get QMC channel ts info failed %d\n", ret);
return ret;
}
ret = qmc_hdlc_xlate_slot_map(qmc_hdlc, te1->slot_map, &ts_info);
if (ret)
return ret;
ret = qmc_chan_set_ts_info(qmc_hdlc->qmc_chan, &ts_info);
if (ret) {
dev_err(qmc_hdlc->dev, "set QMC channel ts info failed %d\n", ret);
return ret;
}
qmc_hdlc->slot_map = te1->slot_map;
ret = qmc_hdlc_framer_set_iface(qmc_hdlc, if_iface, te1);
if (ret) {
dev_err(qmc_hdlc->dev, "framer set iface failed %d\n", ret);
return ret;
}
return 0;
}
static int qmc_hdlc_ioctl(struct net_device *netdev, struct if_settings *ifs)
{
struct qmc_hdlc *qmc_hdlc = netdev_to_qmc_hdlc(netdev);
te1_settings te1;
int ret;
switch (ifs->type) {
case IF_GET_IFACE:
if (ifs->size < sizeof(te1)) {
/* Retrieve type only */
ret = qmc_hdlc_framer_get_iface(qmc_hdlc, &ifs->type, NULL);
if (ret)
return ret;
if (!ifs->size)
return 0; /* only type requested */
ifs->size = sizeof(te1); /* data size wanted */
return -ENOBUFS;
}
memset(&te1, 0, sizeof(te1));
/* Retrieve info from framer */
ret = qmc_hdlc_framer_get_iface(qmc_hdlc, &ifs->type, &te1);
if (ret)
return ret;
/* Update slot_map */
te1.slot_map = qmc_hdlc->slot_map;
if (copy_to_user(ifs->ifs_ifsu.te1, &te1, sizeof(te1)))
return -EFAULT;
return 0;
case IF_IFACE_E1:
case IF_IFACE_T1:
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if (netdev->flags & IFF_UP)
return -EBUSY;
if (copy_from_user(&te1, ifs->ifs_ifsu.te1, sizeof(te1)))
return -EFAULT;
return qmc_hdlc_set_iface(qmc_hdlc, ifs->type, &te1);
default:
return hdlc_ioctl(netdev, ifs);
}
}
static int qmc_hdlc_open(struct net_device *netdev)
{
struct qmc_hdlc *qmc_hdlc = netdev_to_qmc_hdlc(netdev);
struct qmc_chan_param chan_param;
struct qmc_hdlc_desc *desc;
int ret;
int i;
ret = qmc_hdlc_framer_start(qmc_hdlc);
if (ret)
return ret;
ret = hdlc_open(netdev);
if (ret)
goto framer_stop;
/* Update carrier */
qmc_hdlc_framer_set_carrier(qmc_hdlc);
chan_param.mode = QMC_HDLC;
/* HDLC_MAX_MRU + 4 for the CRC
* HDLC_MAX_MRU + 4 + 8 for the CRC and some extraspace needed by the QMC
*/
chan_param.hdlc.max_rx_buf_size = HDLC_MAX_MRU + 4 + 8;
chan_param.hdlc.max_rx_frame_size = HDLC_MAX_MRU + 4;
chan_param.hdlc.is_crc32 = qmc_hdlc->is_crc32;
ret = qmc_chan_set_param(qmc_hdlc->qmc_chan, &chan_param);
if (ret) {
dev_err(qmc_hdlc->dev, "failed to set param (%d)\n", ret);
goto hdlc_close;
}
/* Queue as many recv descriptors as possible */
for (i = 0; i < ARRAY_SIZE(qmc_hdlc->rx_descs); i++) {
desc = &qmc_hdlc->rx_descs[i];
desc->netdev = netdev;
ret = qmc_hdlc_recv_queue(qmc_hdlc, desc, chan_param.hdlc.max_rx_buf_size);
if (ret == -EBUSY && i != 0)
break; /* We use all the QMC chan capability */
if (ret)
goto free_desc;
}
ret = qmc_chan_start(qmc_hdlc->qmc_chan, QMC_CHAN_ALL);
if (ret) {
dev_err(qmc_hdlc->dev, "qmc chan start failed (%d)\n", ret);
goto free_desc;
}
netif_start_queue(netdev);
return 0;
free_desc:
qmc_chan_reset(qmc_hdlc->qmc_chan, QMC_CHAN_ALL);
while (i--) {
desc = &qmc_hdlc->rx_descs[i];
dma_unmap_single(qmc_hdlc->dev, desc->dma_addr, desc->dma_size,
DMA_FROM_DEVICE);
kfree_skb(desc->skb);
desc->skb = NULL;
}
hdlc_close:
hdlc_close(netdev);
framer_stop:
qmc_hdlc_framer_stop(qmc_hdlc);
return ret;
}
static int qmc_hdlc_close(struct net_device *netdev)
{
struct qmc_hdlc *qmc_hdlc = netdev_to_qmc_hdlc(netdev);
struct qmc_hdlc_desc *desc;
int i;
qmc_chan_stop(qmc_hdlc->qmc_chan, QMC_CHAN_ALL);
qmc_chan_reset(qmc_hdlc->qmc_chan, QMC_CHAN_ALL);
netif_stop_queue(netdev);
for (i = 0; i < ARRAY_SIZE(qmc_hdlc->tx_descs); i++) {
desc = &qmc_hdlc->tx_descs[i];
if (!desc->skb)
continue;
dma_unmap_single(qmc_hdlc->dev, desc->dma_addr, desc->dma_size,
DMA_TO_DEVICE);
kfree_skb(desc->skb);
desc->skb = NULL;
}
for (i = 0; i < ARRAY_SIZE(qmc_hdlc->rx_descs); i++) {
desc = &qmc_hdlc->rx_descs[i];
if (!desc->skb)
continue;
dma_unmap_single(qmc_hdlc->dev, desc->dma_addr, desc->dma_size,
DMA_FROM_DEVICE);
kfree_skb(desc->skb);
desc->skb = NULL;
}
hdlc_close(netdev);
qmc_hdlc_framer_stop(qmc_hdlc);
return 0;
}
static int qmc_hdlc_attach(struct net_device *netdev, unsigned short encoding,
unsigned short parity)
{
struct qmc_hdlc *qmc_hdlc = netdev_to_qmc_hdlc(netdev);
if (encoding != ENCODING_NRZ)
return -EINVAL;
switch (parity) {
case PARITY_CRC16_PR1_CCITT:
qmc_hdlc->is_crc32 = false;
break;
case PARITY_CRC32_PR1_CCITT:
qmc_hdlc->is_crc32 = true;
break;
default:
dev_err(qmc_hdlc->dev, "unsupported parity %u\n", parity);
return -EINVAL;
}
return 0;
}
static const struct net_device_ops qmc_hdlc_netdev_ops = {
.ndo_open = qmc_hdlc_open,
.ndo_stop = qmc_hdlc_close,
.ndo_start_xmit = hdlc_start_xmit,
.ndo_siocwandev = qmc_hdlc_ioctl,
};
static int qmc_hdlc_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct qmc_chan_ts_info ts_info;
struct qmc_hdlc *qmc_hdlc;
struct qmc_chan_info info;
hdlc_device *hdlc;
int ret;
qmc_hdlc = devm_kzalloc(dev, sizeof(*qmc_hdlc), GFP_KERNEL);
if (!qmc_hdlc)
return -ENOMEM;
qmc_hdlc->dev = dev;
spin_lock_init(&qmc_hdlc->tx_lock);
spin_lock_init(&qmc_hdlc->carrier_lock);
qmc_hdlc->qmc_chan = devm_qmc_chan_get_bychild(dev, dev->of_node);
if (IS_ERR(qmc_hdlc->qmc_chan))
return dev_err_probe(dev, PTR_ERR(qmc_hdlc->qmc_chan),
"get QMC channel failed\n");
ret = qmc_chan_get_info(qmc_hdlc->qmc_chan, &info);
if (ret)
return dev_err_probe(dev, ret, "get QMC channel info failed\n");
if (info.mode != QMC_HDLC)
return dev_err_probe(dev, -EINVAL, "QMC chan mode %d is not QMC_HDLC\n",
info.mode);
ret = qmc_chan_get_ts_info(qmc_hdlc->qmc_chan, &ts_info);
if (ret)
return dev_err_probe(dev, ret, "get QMC channel ts info failed\n");
ret = qmc_hdlc_xlate_ts_info(qmc_hdlc, &ts_info, &qmc_hdlc->slot_map);
if (ret)
return ret;
qmc_hdlc->framer = devm_framer_optional_get(dev, "fsl,framer");
if (IS_ERR(qmc_hdlc->framer))
return PTR_ERR(qmc_hdlc->framer);
ret = qmc_hdlc_framer_init(qmc_hdlc);
if (ret)
return ret;
qmc_hdlc->netdev = alloc_hdlcdev(qmc_hdlc);
if (!qmc_hdlc->netdev) {
ret = -ENOMEM;
goto framer_exit;
}
hdlc = dev_to_hdlc(qmc_hdlc->netdev);
hdlc->attach = qmc_hdlc_attach;
hdlc->xmit = qmc_hdlc_xmit;
SET_NETDEV_DEV(qmc_hdlc->netdev, dev);
qmc_hdlc->netdev->tx_queue_len = ARRAY_SIZE(qmc_hdlc->tx_descs);
qmc_hdlc->netdev->netdev_ops = &qmc_hdlc_netdev_ops;
ret = register_hdlc_device(qmc_hdlc->netdev);
if (ret) {
dev_err_probe(dev, ret, "failed to register hdlc device\n");
goto free_netdev;
}
platform_set_drvdata(pdev, qmc_hdlc);
return 0;
free_netdev:
free_netdev(qmc_hdlc->netdev);
framer_exit:
qmc_hdlc_framer_exit(qmc_hdlc);
return ret;
}
static void qmc_hdlc_remove(struct platform_device *pdev)
{
struct qmc_hdlc *qmc_hdlc = platform_get_drvdata(pdev);
unregister_hdlc_device(qmc_hdlc->netdev);
free_netdev(qmc_hdlc->netdev);
qmc_hdlc_framer_exit(qmc_hdlc);
}
static const struct of_device_id qmc_hdlc_id_table[] = {
{ .compatible = "fsl,qmc-hdlc" },
{} /* sentinel */
};
MODULE_DEVICE_TABLE(of, qmc_hdlc_id_table);
static struct platform_driver qmc_hdlc_driver = {
.driver = {
.name = "fsl-qmc-hdlc",
.of_match_table = qmc_hdlc_id_table,
},
.probe = qmc_hdlc_probe,
.remove_new = qmc_hdlc_remove,
};
module_platform_driver(qmc_hdlc_driver);
MODULE_AUTHOR("Herve Codina <herve.codina@bootlin.com>");
MODULE_DESCRIPTION("QMC HDLC driver");
MODULE_LICENSE("GPL");