return handled;
}
-static inline struct
-mcp251xfd_tx_obj *mcp251xfd_get_tx_obj_next(struct mcp251xfd_tx_ring *tx_ring)
-{
- u8 tx_head;
-
- tx_head = mcp251xfd_get_tx_head(tx_ring);
-
- return &tx_ring->obj[tx_head];
-}
-
-static void
-mcp251xfd_tx_obj_from_skb(const struct mcp251xfd_priv *priv,
- struct mcp251xfd_tx_obj *tx_obj,
- const struct sk_buff *skb,
- unsigned int seq)
-{
- const struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
- struct mcp251xfd_hw_tx_obj_raw *hw_tx_obj;
- union mcp251xfd_tx_obj_load_buf *load_buf;
- u8 dlc;
- u32 id, flags;
- int len_sanitized = 0, len;
-
- if (cfd->can_id & CAN_EFF_FLAG) {
- u32 sid, eid;
-
- sid = FIELD_GET(MCP251XFD_REG_FRAME_EFF_SID_MASK, cfd->can_id);
- eid = FIELD_GET(MCP251XFD_REG_FRAME_EFF_EID_MASK, cfd->can_id);
-
- id = FIELD_PREP(MCP251XFD_OBJ_ID_EID_MASK, eid) |
- FIELD_PREP(MCP251XFD_OBJ_ID_SID_MASK, sid);
-
- flags = MCP251XFD_OBJ_FLAGS_IDE;
- } else {
- id = FIELD_PREP(MCP251XFD_OBJ_ID_SID_MASK, cfd->can_id);
- flags = 0;
- }
-
- /* Use the MCP2518FD mask even on the MCP2517FD. It doesn't
- * harm, only the lower 7 bits will be transferred into the
- * TEF object.
- */
- flags |= FIELD_PREP(MCP251XFD_OBJ_FLAGS_SEQ_MCP2518FD_MASK, seq);
-
- if (cfd->can_id & CAN_RTR_FLAG)
- flags |= MCP251XFD_OBJ_FLAGS_RTR;
- else
- len_sanitized = canfd_sanitize_len(cfd->len);
-
- /* CANFD */
- if (can_is_canfd_skb(skb)) {
- if (cfd->flags & CANFD_ESI)
- flags |= MCP251XFD_OBJ_FLAGS_ESI;
-
- flags |= MCP251XFD_OBJ_FLAGS_FDF;
-
- if (cfd->flags & CANFD_BRS)
- flags |= MCP251XFD_OBJ_FLAGS_BRS;
-
- dlc = can_fd_len2dlc(cfd->len);
- } else {
- dlc = can_get_cc_dlc((struct can_frame *)cfd,
- priv->can.ctrlmode);
- }
-
- flags |= FIELD_PREP(MCP251XFD_OBJ_FLAGS_DLC_MASK, dlc);
-
- load_buf = &tx_obj->buf;
- if (priv->devtype_data.quirks & MCP251XFD_QUIRK_CRC_TX)
- hw_tx_obj = &load_buf->crc.hw_tx_obj;
- else
- hw_tx_obj = &load_buf->nocrc.hw_tx_obj;
-
- put_unaligned_le32(id, &hw_tx_obj->id);
- put_unaligned_le32(flags, &hw_tx_obj->flags);
-
- /* Copy data */
- memcpy(hw_tx_obj->data, cfd->data, cfd->len);
-
- /* Clear unused data at end of CAN frame */
- if (MCP251XFD_SANITIZE_CAN && len_sanitized) {
- int pad_len;
-
- pad_len = len_sanitized - cfd->len;
- if (pad_len)
- memset(hw_tx_obj->data + cfd->len, 0x0, pad_len);
- }
-
- /* Number of bytes to be written into the RAM of the controller */
- len = sizeof(hw_tx_obj->id) + sizeof(hw_tx_obj->flags);
- if (MCP251XFD_SANITIZE_CAN)
- len += round_up(len_sanitized, sizeof(u32));
- else
- len += round_up(cfd->len, sizeof(u32));
-
- if (priv->devtype_data.quirks & MCP251XFD_QUIRK_CRC_TX) {
- u16 crc;
-
- mcp251xfd_spi_cmd_crc_set_len_in_ram(&load_buf->crc.cmd,
- len);
- /* CRC */
- len += sizeof(load_buf->crc.cmd);
- crc = mcp251xfd_crc16_compute(&load_buf->crc, len);
- put_unaligned_be16(crc, (void *)load_buf + len);
-
- /* Total length */
- len += sizeof(load_buf->crc.crc);
- } else {
- len += sizeof(load_buf->nocrc.cmd);
- }
-
- tx_obj->xfer[0].len = len;
-}
-
-static int mcp251xfd_tx_obj_write(const struct mcp251xfd_priv *priv,
- struct mcp251xfd_tx_obj *tx_obj)
-{
- return spi_async(priv->spi, &tx_obj->msg);
-}
-
-static bool mcp251xfd_tx_busy(const struct mcp251xfd_priv *priv,
- struct mcp251xfd_tx_ring *tx_ring)
-{
- if (mcp251xfd_get_tx_free(tx_ring) > 0)
- return false;
-
- netif_stop_queue(priv->ndev);
-
- /* Memory barrier before checking tx_free (head and tail) */
- smp_mb();
-
- if (mcp251xfd_get_tx_free(tx_ring) == 0) {
- netdev_dbg(priv->ndev,
- "Stopping tx-queue (tx_head=0x%08x, tx_tail=0x%08x, len=%d).\n",
- tx_ring->head, tx_ring->tail,
- tx_ring->head - tx_ring->tail);
-
- return true;
- }
-
- netif_start_queue(priv->ndev);
-
- return false;
-}
-
-static netdev_tx_t mcp251xfd_start_xmit(struct sk_buff *skb,
- struct net_device *ndev)
-{
- struct mcp251xfd_priv *priv = netdev_priv(ndev);
- struct mcp251xfd_tx_ring *tx_ring = priv->tx;
- struct mcp251xfd_tx_obj *tx_obj;
- unsigned int frame_len;
- u8 tx_head;
- int err;
-
- if (can_dropped_invalid_skb(ndev, skb))
- return NETDEV_TX_OK;
-
- if (mcp251xfd_tx_busy(priv, tx_ring))
- return NETDEV_TX_BUSY;
-
- tx_obj = mcp251xfd_get_tx_obj_next(tx_ring);
- mcp251xfd_tx_obj_from_skb(priv, tx_obj, skb, tx_ring->head);
-
- /* Stop queue if we occupy the complete TX FIFO */
- tx_head = mcp251xfd_get_tx_head(tx_ring);
- tx_ring->head++;
- if (mcp251xfd_get_tx_free(tx_ring) == 0)
- netif_stop_queue(ndev);
-
- frame_len = can_skb_get_frame_len(skb);
- err = can_put_echo_skb(skb, ndev, tx_head, frame_len);
- if (!err)
- netdev_sent_queue(priv->ndev, frame_len);
-
- err = mcp251xfd_tx_obj_write(priv, tx_obj);
- if (err)
- goto out_err;
-
- return NETDEV_TX_OK;
-
- out_err:
- netdev_err(priv->ndev, "ERROR in %s: %d\n", __func__, err);
-
- return NETDEV_TX_OK;
-}
-
static int mcp251xfd_open(struct net_device *ndev)
{
struct mcp251xfd_priv *priv = netdev_priv(ndev);
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+//
+// mcp251xfd - Microchip MCP251xFD Family CAN controller driver
+//
+// Copyright (c) 2019, 2020, 2021 Pengutronix,
+// Marc Kleine-Budde <kernel@pengutronix.de>
+//
+// Based on:
+//
+// CAN bus driver for Microchip 25XXFD CAN Controller with SPI Interface
+//
+// Copyright (c) 2019 Martin Sperl <kernel@martin.sperl.org>
+//
+
+#include <asm/unaligned.h>
+#include <linux/bitfield.h>
+
+#include "mcp251xfd.h"
+
+static inline struct
+mcp251xfd_tx_obj *mcp251xfd_get_tx_obj_next(struct mcp251xfd_tx_ring *tx_ring)
+{
+ u8 tx_head;
+
+ tx_head = mcp251xfd_get_tx_head(tx_ring);
+
+ return &tx_ring->obj[tx_head];
+}
+
+static void
+mcp251xfd_tx_obj_from_skb(const struct mcp251xfd_priv *priv,
+ struct mcp251xfd_tx_obj *tx_obj,
+ const struct sk_buff *skb,
+ unsigned int seq)
+{
+ const struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
+ struct mcp251xfd_hw_tx_obj_raw *hw_tx_obj;
+ union mcp251xfd_tx_obj_load_buf *load_buf;
+ u8 dlc;
+ u32 id, flags;
+ int len_sanitized = 0, len;
+
+ if (cfd->can_id & CAN_EFF_FLAG) {
+ u32 sid, eid;
+
+ sid = FIELD_GET(MCP251XFD_REG_FRAME_EFF_SID_MASK, cfd->can_id);
+ eid = FIELD_GET(MCP251XFD_REG_FRAME_EFF_EID_MASK, cfd->can_id);
+
+ id = FIELD_PREP(MCP251XFD_OBJ_ID_EID_MASK, eid) |
+ FIELD_PREP(MCP251XFD_OBJ_ID_SID_MASK, sid);
+
+ flags = MCP251XFD_OBJ_FLAGS_IDE;
+ } else {
+ id = FIELD_PREP(MCP251XFD_OBJ_ID_SID_MASK, cfd->can_id);
+ flags = 0;
+ }
+
+ /* Use the MCP2518FD mask even on the MCP2517FD. It doesn't
+ * harm, only the lower 7 bits will be transferred into the
+ * TEF object.
+ */
+ flags |= FIELD_PREP(MCP251XFD_OBJ_FLAGS_SEQ_MCP2518FD_MASK, seq);
+
+ if (cfd->can_id & CAN_RTR_FLAG)
+ flags |= MCP251XFD_OBJ_FLAGS_RTR;
+ else
+ len_sanitized = canfd_sanitize_len(cfd->len);
+
+ /* CANFD */
+ if (can_is_canfd_skb(skb)) {
+ if (cfd->flags & CANFD_ESI)
+ flags |= MCP251XFD_OBJ_FLAGS_ESI;
+
+ flags |= MCP251XFD_OBJ_FLAGS_FDF;
+
+ if (cfd->flags & CANFD_BRS)
+ flags |= MCP251XFD_OBJ_FLAGS_BRS;
+
+ dlc = can_fd_len2dlc(cfd->len);
+ } else {
+ dlc = can_get_cc_dlc((struct can_frame *)cfd,
+ priv->can.ctrlmode);
+ }
+
+ flags |= FIELD_PREP(MCP251XFD_OBJ_FLAGS_DLC_MASK, dlc);
+
+ load_buf = &tx_obj->buf;
+ if (priv->devtype_data.quirks & MCP251XFD_QUIRK_CRC_TX)
+ hw_tx_obj = &load_buf->crc.hw_tx_obj;
+ else
+ hw_tx_obj = &load_buf->nocrc.hw_tx_obj;
+
+ put_unaligned_le32(id, &hw_tx_obj->id);
+ put_unaligned_le32(flags, &hw_tx_obj->flags);
+
+ /* Copy data */
+ memcpy(hw_tx_obj->data, cfd->data, cfd->len);
+
+ /* Clear unused data at end of CAN frame */
+ if (MCP251XFD_SANITIZE_CAN && len_sanitized) {
+ int pad_len;
+
+ pad_len = len_sanitized - cfd->len;
+ if (pad_len)
+ memset(hw_tx_obj->data + cfd->len, 0x0, pad_len);
+ }
+
+ /* Number of bytes to be written into the RAM of the controller */
+ len = sizeof(hw_tx_obj->id) + sizeof(hw_tx_obj->flags);
+ if (MCP251XFD_SANITIZE_CAN)
+ len += round_up(len_sanitized, sizeof(u32));
+ else
+ len += round_up(cfd->len, sizeof(u32));
+
+ if (priv->devtype_data.quirks & MCP251XFD_QUIRK_CRC_TX) {
+ u16 crc;
+
+ mcp251xfd_spi_cmd_crc_set_len_in_ram(&load_buf->crc.cmd,
+ len);
+ /* CRC */
+ len += sizeof(load_buf->crc.cmd);
+ crc = mcp251xfd_crc16_compute(&load_buf->crc, len);
+ put_unaligned_be16(crc, (void *)load_buf + len);
+
+ /* Total length */
+ len += sizeof(load_buf->crc.crc);
+ } else {
+ len += sizeof(load_buf->nocrc.cmd);
+ }
+
+ tx_obj->xfer[0].len = len;
+}
+
+static int mcp251xfd_tx_obj_write(const struct mcp251xfd_priv *priv,
+ struct mcp251xfd_tx_obj *tx_obj)
+{
+ return spi_async(priv->spi, &tx_obj->msg);
+}
+
+static bool mcp251xfd_tx_busy(const struct mcp251xfd_priv *priv,
+ struct mcp251xfd_tx_ring *tx_ring)
+{
+ if (mcp251xfd_get_tx_free(tx_ring) > 0)
+ return false;
+
+ netif_stop_queue(priv->ndev);
+
+ /* Memory barrier before checking tx_free (head and tail) */
+ smp_mb();
+
+ if (mcp251xfd_get_tx_free(tx_ring) == 0) {
+ netdev_dbg(priv->ndev,
+ "Stopping tx-queue (tx_head=0x%08x, tx_tail=0x%08x, len=%d).\n",
+ tx_ring->head, tx_ring->tail,
+ tx_ring->head - tx_ring->tail);
+
+ return true;
+ }
+
+ netif_start_queue(priv->ndev);
+
+ return false;
+}
+
+netdev_tx_t mcp251xfd_start_xmit(struct sk_buff *skb,
+ struct net_device *ndev)
+{
+ struct mcp251xfd_priv *priv = netdev_priv(ndev);
+ struct mcp251xfd_tx_ring *tx_ring = priv->tx;
+ struct mcp251xfd_tx_obj *tx_obj;
+ unsigned int frame_len;
+ u8 tx_head;
+ int err;
+
+ if (can_dropped_invalid_skb(ndev, skb))
+ return NETDEV_TX_OK;
+
+ if (mcp251xfd_tx_busy(priv, tx_ring))
+ return NETDEV_TX_BUSY;
+
+ tx_obj = mcp251xfd_get_tx_obj_next(tx_ring);
+ mcp251xfd_tx_obj_from_skb(priv, tx_obj, skb, tx_ring->head);
+
+ /* Stop queue if we occupy the complete TX FIFO */
+ tx_head = mcp251xfd_get_tx_head(tx_ring);
+ tx_ring->head++;
+ if (mcp251xfd_get_tx_free(tx_ring) == 0)
+ netif_stop_queue(ndev);
+
+ frame_len = can_skb_get_frame_len(skb);
+ err = can_put_echo_skb(skb, ndev, tx_head, frame_len);
+ if (!err)
+ netdev_sent_queue(priv->ndev, frame_len);
+
+ err = mcp251xfd_tx_obj_write(priv, tx_obj);
+ if (err)
+ goto out_err;
+
+ return NETDEV_TX_OK;
+
+ out_err:
+ netdev_err(priv->ndev, "ERROR in %s: %d\n", __func__, err);
+
+ return NETDEV_TX_OK;
+}
projects / kernel.git / commitdiff