blob: 8c4195a9a2cc625e0a616e39d4fabc3909f040e7 [file] [log] [blame]
/* Synopsys DesignWare Core Enterprise Ethernet (XLGMAC) Driver
*
* Copyright (c) 2017 Synopsys, Inc. (www.synopsys.com)
*
* This program is dual-licensed; you may select either version 2 of
* the GNU General Public License ("GPL") or BSD license ("BSD").
*
* This Synopsys DWC XLGMAC software driver and associated documentation
* (hereinafter the "Software") is an unsupported proprietary work of
* Synopsys, Inc. unless otherwise expressly agreed to in writing between
* Synopsys and you. The Software IS NOT an item of Licensed Software or a
* Licensed Product under any End User Software License Agreement or
* Agreement for Licensed Products with Synopsys or any supplement thereto.
* Synopsys is a registered trademark of Synopsys, Inc. Other names included
* in the SOFTWARE may be the trademarks of their respective owners.
*/
#include "dwc-xlgmac.h"
#include "dwc-xlgmac-reg.h"
static void xlgmac_unmap_desc_data(struct xlgmac_pdata *pdata,
struct xlgmac_desc_data *desc_data)
{
if (desc_data->skb_dma) {
if (desc_data->mapped_as_page) {
dma_unmap_page(pdata->dev, desc_data->skb_dma,
desc_data->skb_dma_len, DMA_TO_DEVICE);
} else {
dma_unmap_single(pdata->dev, desc_data->skb_dma,
desc_data->skb_dma_len, DMA_TO_DEVICE);
}
desc_data->skb_dma = 0;
desc_data->skb_dma_len = 0;
}
if (desc_data->skb) {
dev_kfree_skb_any(desc_data->skb);
desc_data->skb = NULL;
}
if (desc_data->rx.hdr.pa.pages)
put_page(desc_data->rx.hdr.pa.pages);
if (desc_data->rx.hdr.pa_unmap.pages) {
dma_unmap_page(pdata->dev, desc_data->rx.hdr.pa_unmap.pages_dma,
desc_data->rx.hdr.pa_unmap.pages_len,
DMA_FROM_DEVICE);
put_page(desc_data->rx.hdr.pa_unmap.pages);
}
if (desc_data->rx.buf.pa.pages)
put_page(desc_data->rx.buf.pa.pages);
if (desc_data->rx.buf.pa_unmap.pages) {
dma_unmap_page(pdata->dev, desc_data->rx.buf.pa_unmap.pages_dma,
desc_data->rx.buf.pa_unmap.pages_len,
DMA_FROM_DEVICE);
put_page(desc_data->rx.buf.pa_unmap.pages);
}
memset(&desc_data->tx, 0, sizeof(desc_data->tx));
memset(&desc_data->rx, 0, sizeof(desc_data->rx));
desc_data->mapped_as_page = 0;
if (desc_data->state_saved) {
desc_data->state_saved = 0;
desc_data->state.skb = NULL;
desc_data->state.len = 0;
desc_data->state.error = 0;
}
}
static void xlgmac_free_ring(struct xlgmac_pdata *pdata,
struct xlgmac_ring *ring)
{
struct xlgmac_desc_data *desc_data;
unsigned int i;
if (!ring)
return;
if (ring->desc_data_head) {
for (i = 0; i < ring->dma_desc_count; i++) {
desc_data = XLGMAC_GET_DESC_DATA(ring, i);
xlgmac_unmap_desc_data(pdata, desc_data);
}
kfree(ring->desc_data_head);
ring->desc_data_head = NULL;
}
if (ring->rx_hdr_pa.pages) {
dma_unmap_page(pdata->dev, ring->rx_hdr_pa.pages_dma,
ring->rx_hdr_pa.pages_len, DMA_FROM_DEVICE);
put_page(ring->rx_hdr_pa.pages);
ring->rx_hdr_pa.pages = NULL;
ring->rx_hdr_pa.pages_len = 0;
ring->rx_hdr_pa.pages_offset = 0;
ring->rx_hdr_pa.pages_dma = 0;
}
if (ring->rx_buf_pa.pages) {
dma_unmap_page(pdata->dev, ring->rx_buf_pa.pages_dma,
ring->rx_buf_pa.pages_len, DMA_FROM_DEVICE);
put_page(ring->rx_buf_pa.pages);
ring->rx_buf_pa.pages = NULL;
ring->rx_buf_pa.pages_len = 0;
ring->rx_buf_pa.pages_offset = 0;
ring->rx_buf_pa.pages_dma = 0;
}
if (ring->dma_desc_head) {
dma_free_coherent(pdata->dev,
(sizeof(struct xlgmac_dma_desc) *
ring->dma_desc_count),
ring->dma_desc_head,
ring->dma_desc_head_addr);
ring->dma_desc_head = NULL;
}
}
static int xlgmac_init_ring(struct xlgmac_pdata *pdata,
struct xlgmac_ring *ring,
unsigned int dma_desc_count)
{
if (!ring)
return 0;
/* Descriptors */
ring->dma_desc_count = dma_desc_count;
ring->dma_desc_head = dma_alloc_coherent(pdata->dev,
(sizeof(struct xlgmac_dma_desc) *
dma_desc_count),
&ring->dma_desc_head_addr,
GFP_KERNEL);
if (!ring->dma_desc_head)
return -ENOMEM;
/* Array of descriptor data */
ring->desc_data_head = kcalloc(dma_desc_count,
sizeof(struct xlgmac_desc_data),
GFP_KERNEL);
if (!ring->desc_data_head)
return -ENOMEM;
netif_dbg(pdata, drv, pdata->netdev,
"dma_desc_head=%p, dma_desc_head_addr=%pad, desc_data_head=%p\n",
ring->dma_desc_head,
&ring->dma_desc_head_addr,
ring->desc_data_head);
return 0;
}
static void xlgmac_free_rings(struct xlgmac_pdata *pdata)
{
struct xlgmac_channel *channel;
unsigned int i;
if (!pdata->channel_head)
return;
channel = pdata->channel_head;
for (i = 0; i < pdata->channel_count; i++, channel++) {
xlgmac_free_ring(pdata, channel->tx_ring);
xlgmac_free_ring(pdata, channel->rx_ring);
}
}
static int xlgmac_alloc_rings(struct xlgmac_pdata *pdata)
{
struct xlgmac_channel *channel;
unsigned int i;
int ret;
channel = pdata->channel_head;
for (i = 0; i < pdata->channel_count; i++, channel++) {
netif_dbg(pdata, drv, pdata->netdev, "%s - Tx ring:\n",
channel->name);
ret = xlgmac_init_ring(pdata, channel->tx_ring,
pdata->tx_desc_count);
if (ret) {
netdev_alert(pdata->netdev,
"error initializing Tx ring");
goto err_init_ring;
}
netif_dbg(pdata, drv, pdata->netdev, "%s - Rx ring:\n",
channel->name);
ret = xlgmac_init_ring(pdata, channel->rx_ring,
pdata->rx_desc_count);
if (ret) {
netdev_alert(pdata->netdev,
"error initializing Rx ring\n");
goto err_init_ring;
}
}
return 0;
err_init_ring:
xlgmac_free_rings(pdata);
return ret;
}
static void xlgmac_free_channels(struct xlgmac_pdata *pdata)
{
if (!pdata->channel_head)
return;
kfree(pdata->channel_head->tx_ring);
pdata->channel_head->tx_ring = NULL;
kfree(pdata->channel_head->rx_ring);
pdata->channel_head->rx_ring = NULL;
kfree(pdata->channel_head);
pdata->channel_head = NULL;
pdata->channel_count = 0;
}
static int xlgmac_alloc_channels(struct xlgmac_pdata *pdata)
{
struct xlgmac_channel *channel_head, *channel;
struct xlgmac_ring *tx_ring, *rx_ring;
int ret = -ENOMEM;
unsigned int i;
channel_head = kcalloc(pdata->channel_count,
sizeof(struct xlgmac_channel), GFP_KERNEL);
if (!channel_head)
return ret;
netif_dbg(pdata, drv, pdata->netdev,
"channel_head=%p\n", channel_head);
tx_ring = kcalloc(pdata->tx_ring_count, sizeof(struct xlgmac_ring),
GFP_KERNEL);
if (!tx_ring)
goto err_tx_ring;
rx_ring = kcalloc(pdata->rx_ring_count, sizeof(struct xlgmac_ring),
GFP_KERNEL);
if (!rx_ring)
goto err_rx_ring;
for (i = 0, channel = channel_head; i < pdata->channel_count;
i++, channel++) {
snprintf(channel->name, sizeof(channel->name), "channel-%u", i);
channel->pdata = pdata;
channel->queue_index = i;
channel->dma_regs = pdata->mac_regs + DMA_CH_BASE +
(DMA_CH_INC * i);
if (pdata->per_channel_irq) {
/* Get the per DMA interrupt */
ret = pdata->channel_irq[i];
if (ret < 0) {
netdev_err(pdata->netdev,
"get_irq %u failed\n",
i + 1);
goto err_irq;
}
channel->dma_irq = ret;
}
if (i < pdata->tx_ring_count)
channel->tx_ring = tx_ring++;
if (i < pdata->rx_ring_count)
channel->rx_ring = rx_ring++;
netif_dbg(pdata, drv, pdata->netdev,
"%s: dma_regs=%p, tx_ring=%p, rx_ring=%p\n",
channel->name, channel->dma_regs,
channel->tx_ring, channel->rx_ring);
}
pdata->channel_head = channel_head;
return 0;
err_irq:
kfree(rx_ring);
err_rx_ring:
kfree(tx_ring);
err_tx_ring:
kfree(channel_head);
return ret;
}
static void xlgmac_free_channels_and_rings(struct xlgmac_pdata *pdata)
{
xlgmac_free_rings(pdata);
xlgmac_free_channels(pdata);
}
static int xlgmac_alloc_channels_and_rings(struct xlgmac_pdata *pdata)
{
int ret;
ret = xlgmac_alloc_channels(pdata);
if (ret)
goto err_alloc;
ret = xlgmac_alloc_rings(pdata);
if (ret)
goto err_alloc;
return 0;
err_alloc:
xlgmac_free_channels_and_rings(pdata);
return ret;
}
static int xlgmac_alloc_pages(struct xlgmac_pdata *pdata,
struct xlgmac_page_alloc *pa,
gfp_t gfp, int order)
{
struct page *pages = NULL;
dma_addr_t pages_dma;
/* Try to obtain pages, decreasing order if necessary */
gfp |= __GFP_COMP | __GFP_NOWARN;
while (order >= 0) {
pages = alloc_pages(gfp, order);
if (pages)
break;
order--;
}
if (!pages)
return -ENOMEM;
/* Map the pages */
pages_dma = dma_map_page(pdata->dev, pages, 0,
PAGE_SIZE << order, DMA_FROM_DEVICE);
if (dma_mapping_error(pdata->dev, pages_dma)) {
put_page(pages);
return -ENOMEM;
}
pa->pages = pages;
pa->pages_len = PAGE_SIZE << order;
pa->pages_offset = 0;
pa->pages_dma = pages_dma;
return 0;
}
static void xlgmac_set_buffer_data(struct xlgmac_buffer_data *bd,
struct xlgmac_page_alloc *pa,
unsigned int len)
{
get_page(pa->pages);
bd->pa = *pa;
bd->dma_base = pa->pages_dma;
bd->dma_off = pa->pages_offset;
bd->dma_len = len;
pa->pages_offset += len;
if ((pa->pages_offset + len) > pa->pages_len) {
/* This data descriptor is responsible for unmapping page(s) */
bd->pa_unmap = *pa;
/* Get a new allocation next time */
pa->pages = NULL;
pa->pages_len = 0;
pa->pages_offset = 0;
pa->pages_dma = 0;
}
}
static int xlgmac_map_rx_buffer(struct xlgmac_pdata *pdata,
struct xlgmac_ring *ring,
struct xlgmac_desc_data *desc_data)
{
int order, ret;
if (!ring->rx_hdr_pa.pages) {
ret = xlgmac_alloc_pages(pdata, &ring->rx_hdr_pa,
GFP_ATOMIC, 0);
if (ret)
return ret;
}
if (!ring->rx_buf_pa.pages) {
order = max_t(int, PAGE_ALLOC_COSTLY_ORDER - 1, 0);
ret = xlgmac_alloc_pages(pdata, &ring->rx_buf_pa,
GFP_ATOMIC, order);
if (ret)
return ret;
}
/* Set up the header page info */
xlgmac_set_buffer_data(&desc_data->rx.hdr, &ring->rx_hdr_pa,
XLGMAC_SKB_ALLOC_SIZE);
/* Set up the buffer page info */
xlgmac_set_buffer_data(&desc_data->rx.buf, &ring->rx_buf_pa,
pdata->rx_buf_size);
return 0;
}
static void xlgmac_tx_desc_init(struct xlgmac_pdata *pdata)
{
struct xlgmac_hw_ops *hw_ops = &pdata->hw_ops;
struct xlgmac_desc_data *desc_data;
struct xlgmac_dma_desc *dma_desc;
struct xlgmac_channel *channel;
struct xlgmac_ring *ring;
dma_addr_t dma_desc_addr;
unsigned int i, j;
channel = pdata->channel_head;
for (i = 0; i < pdata->channel_count; i++, channel++) {
ring = channel->tx_ring;
if (!ring)
break;
dma_desc = ring->dma_desc_head;
dma_desc_addr = ring->dma_desc_head_addr;
for (j = 0; j < ring->dma_desc_count; j++) {
desc_data = XLGMAC_GET_DESC_DATA(ring, j);
desc_data->dma_desc = dma_desc;
desc_data->dma_desc_addr = dma_desc_addr;
dma_desc++;
dma_desc_addr += sizeof(struct xlgmac_dma_desc);
}
ring->cur = 0;
ring->dirty = 0;
memset(&ring->tx, 0, sizeof(ring->tx));
hw_ops->tx_desc_init(channel);
}
}
static void xlgmac_rx_desc_init(struct xlgmac_pdata *pdata)
{
struct xlgmac_hw_ops *hw_ops = &pdata->hw_ops;
struct xlgmac_desc_data *desc_data;
struct xlgmac_dma_desc *dma_desc;
struct xlgmac_channel *channel;
struct xlgmac_ring *ring;
dma_addr_t dma_desc_addr;
unsigned int i, j;
channel = pdata->channel_head;
for (i = 0; i < pdata->channel_count; i++, channel++) {
ring = channel->rx_ring;
if (!ring)
break;
dma_desc = ring->dma_desc_head;
dma_desc_addr = ring->dma_desc_head_addr;
for (j = 0; j < ring->dma_desc_count; j++) {
desc_data = XLGMAC_GET_DESC_DATA(ring, j);
desc_data->dma_desc = dma_desc;
desc_data->dma_desc_addr = dma_desc_addr;
if (xlgmac_map_rx_buffer(pdata, ring, desc_data))
break;
dma_desc++;
dma_desc_addr += sizeof(struct xlgmac_dma_desc);
}
ring->cur = 0;
ring->dirty = 0;
hw_ops->rx_desc_init(channel);
}
}
static int xlgmac_map_tx_skb(struct xlgmac_channel *channel,
struct sk_buff *skb)
{
struct xlgmac_pdata *pdata = channel->pdata;
struct xlgmac_ring *ring = channel->tx_ring;
unsigned int start_index, cur_index;
struct xlgmac_desc_data *desc_data;
unsigned int offset, datalen, len;
struct xlgmac_pkt_info *pkt_info;
skb_frag_t *frag;
unsigned int tso, vlan;
dma_addr_t skb_dma;
unsigned int i;
offset = 0;
start_index = ring->cur;
cur_index = ring->cur;
pkt_info = &ring->pkt_info;
pkt_info->desc_count = 0;
pkt_info->length = 0;
tso = XLGMAC_GET_REG_BITS(pkt_info->attributes,
TX_PACKET_ATTRIBUTES_TSO_ENABLE_POS,
TX_PACKET_ATTRIBUTES_TSO_ENABLE_LEN);
vlan = XLGMAC_GET_REG_BITS(pkt_info->attributes,
TX_PACKET_ATTRIBUTES_VLAN_CTAG_POS,
TX_PACKET_ATTRIBUTES_VLAN_CTAG_LEN);
/* Save space for a context descriptor if needed */
if ((tso && (pkt_info->mss != ring->tx.cur_mss)) ||
(vlan && (pkt_info->vlan_ctag != ring->tx.cur_vlan_ctag)))
cur_index++;
desc_data = XLGMAC_GET_DESC_DATA(ring, cur_index);
if (tso) {
/* Map the TSO header */
skb_dma = dma_map_single(pdata->dev, skb->data,
pkt_info->header_len, DMA_TO_DEVICE);
if (dma_mapping_error(pdata->dev, skb_dma)) {
netdev_alert(pdata->netdev, "dma_map_single failed\n");
goto err_out;
}
desc_data->skb_dma = skb_dma;
desc_data->skb_dma_len = pkt_info->header_len;
netif_dbg(pdata, tx_queued, pdata->netdev,
"skb header: index=%u, dma=%pad, len=%u\n",
cur_index, &skb_dma, pkt_info->header_len);
offset = pkt_info->header_len;
pkt_info->length += pkt_info->header_len;
cur_index++;
desc_data = XLGMAC_GET_DESC_DATA(ring, cur_index);
}
/* Map the (remainder of the) packet */
for (datalen = skb_headlen(skb) - offset; datalen; ) {
len = min_t(unsigned int, datalen, XLGMAC_TX_MAX_BUF_SIZE);
skb_dma = dma_map_single(pdata->dev, skb->data + offset, len,
DMA_TO_DEVICE);
if (dma_mapping_error(pdata->dev, skb_dma)) {
netdev_alert(pdata->netdev, "dma_map_single failed\n");
goto err_out;
}
desc_data->skb_dma = skb_dma;
desc_data->skb_dma_len = len;
netif_dbg(pdata, tx_queued, pdata->netdev,
"skb data: index=%u, dma=%pad, len=%u\n",
cur_index, &skb_dma, len);
datalen -= len;
offset += len;
pkt_info->length += len;
cur_index++;
desc_data = XLGMAC_GET_DESC_DATA(ring, cur_index);
}
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
netif_dbg(pdata, tx_queued, pdata->netdev,
"mapping frag %u\n", i);
frag = &skb_shinfo(skb)->frags[i];
offset = 0;
for (datalen = skb_frag_size(frag); datalen; ) {
len = min_t(unsigned int, datalen,
XLGMAC_TX_MAX_BUF_SIZE);
skb_dma = skb_frag_dma_map(pdata->dev, frag, offset,
len, DMA_TO_DEVICE);
if (dma_mapping_error(pdata->dev, skb_dma)) {
netdev_alert(pdata->netdev,
"skb_frag_dma_map failed\n");
goto err_out;
}
desc_data->skb_dma = skb_dma;
desc_data->skb_dma_len = len;
desc_data->mapped_as_page = 1;
netif_dbg(pdata, tx_queued, pdata->netdev,
"skb frag: index=%u, dma=%pad, len=%u\n",
cur_index, &skb_dma, len);
datalen -= len;
offset += len;
pkt_info->length += len;
cur_index++;
desc_data = XLGMAC_GET_DESC_DATA(ring, cur_index);
}
}
/* Save the skb address in the last entry. We always have some data
* that has been mapped so desc_data is always advanced past the last
* piece of mapped data - use the entry pointed to by cur_index - 1.
*/
desc_data = XLGMAC_GET_DESC_DATA(ring, cur_index - 1);
desc_data->skb = skb;
/* Save the number of descriptor entries used */
pkt_info->desc_count = cur_index - start_index;
return pkt_info->desc_count;
err_out:
while (start_index < cur_index) {
desc_data = XLGMAC_GET_DESC_DATA(ring, start_index++);
xlgmac_unmap_desc_data(pdata, desc_data);
}
return 0;
}
void xlgmac_init_desc_ops(struct xlgmac_desc_ops *desc_ops)
{
desc_ops->alloc_channles_and_rings = xlgmac_alloc_channels_and_rings;
desc_ops->free_channels_and_rings = xlgmac_free_channels_and_rings;
desc_ops->map_tx_skb = xlgmac_map_tx_skb;
desc_ops->map_rx_buffer = xlgmac_map_rx_buffer;
desc_ops->unmap_desc_data = xlgmac_unmap_desc_data;
desc_ops->tx_desc_init = xlgmac_tx_desc_init;
desc_ops->rx_desc_init = xlgmac_rx_desc_init;
}