mcp251xfd-objs += mcp251xfd-core.o
mcp251xfd-objs += mcp251xfd-crc16.o
mcp251xfd-objs += mcp251xfd-regmap.o
+mcp251xfd-objs += mcp251xfd-rx.o
mcp251xfd-objs += mcp251xfd-timestamp.o
mcp251xfd-$(CONFIG_DEV_COREDUMP) += mcp251xfd-dump.o
return 0;
}
-static inline int
-mcp251xfd_rx_head_get_from_chip(const struct mcp251xfd_priv *priv,
- const struct mcp251xfd_rx_ring *ring,
- u8 *rx_head)
-{
- u32 fifo_sta;
- int err;
-
- err = regmap_read(priv->map_reg, MCP251XFD_REG_FIFOSTA(ring->fifo_nr),
- &fifo_sta);
- if (err)
- return err;
-
- *rx_head = FIELD_GET(MCP251XFD_REG_FIFOSTA_FIFOCI_MASK, fifo_sta);
-
- return 0;
-}
-
-static inline int
-mcp251xfd_rx_tail_get_from_chip(const struct mcp251xfd_priv *priv,
- const struct mcp251xfd_rx_ring *ring,
- u8 *rx_tail)
-{
- u32 fifo_ua;
- int err;
-
- err = regmap_read(priv->map_reg, MCP251XFD_REG_FIFOUA(ring->fifo_nr),
- &fifo_ua);
- if (err)
- return err;
-
- fifo_ua -= ring->base - MCP251XFD_RAM_START;
- *rx_tail = fifo_ua / ring->obj_size;
-
- return 0;
-}
-
static void
mcp251xfd_tx_ring_init_tx_obj(const struct mcp251xfd_priv *priv,
const struct mcp251xfd_tx_ring *ring,
return 0;
}
-static int
-mcp251xfd_check_rx_tail(const struct mcp251xfd_priv *priv,
- const struct mcp251xfd_rx_ring *ring)
-{
- u8 rx_tail_chip, rx_tail;
- int err;
-
- if (!IS_ENABLED(CONFIG_CAN_MCP251XFD_SANITY))
- return 0;
-
- err = mcp251xfd_rx_tail_get_from_chip(priv, ring, &rx_tail_chip);
- if (err)
- return err;
-
- rx_tail = mcp251xfd_get_rx_tail(ring);
- if (rx_tail_chip != rx_tail) {
- netdev_err(priv->ndev,
- "RX tail of chip (%d) and ours (%d) inconsistent.\n",
- rx_tail_chip, rx_tail);
- return -EILSEQ;
- }
-
- return 0;
-}
-
static int
mcp251xfd_handle_tefif_recover(const struct mcp251xfd_priv *priv, const u32 seq)
{
return 0;
}
-static int
-mcp251xfd_rx_ring_update(const struct mcp251xfd_priv *priv,
- struct mcp251xfd_rx_ring *ring)
-{
- u32 new_head;
- u8 chip_rx_head;
- int err;
-
- err = mcp251xfd_rx_head_get_from_chip(priv, ring, &chip_rx_head);
- if (err)
- return err;
-
- /* chip_rx_head, is the next RX-Object filled by the HW.
- * The new RX head must be >= the old head.
- */
- new_head = round_down(ring->head, ring->obj_num) + chip_rx_head;
- if (new_head <= ring->head)
- new_head += ring->obj_num;
-
- ring->head = new_head;
-
- return mcp251xfd_check_rx_tail(priv, ring);
-}
-
-static void
-mcp251xfd_hw_rx_obj_to_skb(const struct mcp251xfd_priv *priv,
- const struct mcp251xfd_hw_rx_obj_canfd *hw_rx_obj,
- struct sk_buff *skb)
-{
- struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
- u8 dlc;
-
- if (hw_rx_obj->flags & MCP251XFD_OBJ_FLAGS_IDE) {
- u32 sid, eid;
-
- eid = FIELD_GET(MCP251XFD_OBJ_ID_EID_MASK, hw_rx_obj->id);
- sid = FIELD_GET(MCP251XFD_OBJ_ID_SID_MASK, hw_rx_obj->id);
-
- cfd->can_id = CAN_EFF_FLAG |
- FIELD_PREP(MCP251XFD_REG_FRAME_EFF_EID_MASK, eid) |
- FIELD_PREP(MCP251XFD_REG_FRAME_EFF_SID_MASK, sid);
- } else {
- cfd->can_id = FIELD_GET(MCP251XFD_OBJ_ID_SID_MASK,
- hw_rx_obj->id);
- }
-
- dlc = FIELD_GET(MCP251XFD_OBJ_FLAGS_DLC_MASK, hw_rx_obj->flags);
-
- /* CANFD */
- if (hw_rx_obj->flags & MCP251XFD_OBJ_FLAGS_FDF) {
-
- if (hw_rx_obj->flags & MCP251XFD_OBJ_FLAGS_ESI)
- cfd->flags |= CANFD_ESI;
-
- if (hw_rx_obj->flags & MCP251XFD_OBJ_FLAGS_BRS)
- cfd->flags |= CANFD_BRS;
-
- cfd->len = can_fd_dlc2len(dlc);
- } else {
- if (hw_rx_obj->flags & MCP251XFD_OBJ_FLAGS_RTR)
- cfd->can_id |= CAN_RTR_FLAG;
-
- can_frame_set_cc_len((struct can_frame *)cfd, dlc,
- priv->can.ctrlmode);
- }
-
- if (!(hw_rx_obj->flags & MCP251XFD_OBJ_FLAGS_RTR))
- memcpy(cfd->data, hw_rx_obj->data, cfd->len);
-
- mcp251xfd_skb_set_timestamp(priv, skb, hw_rx_obj->ts);
-}
-
-static int
-mcp251xfd_handle_rxif_one(struct mcp251xfd_priv *priv,
- struct mcp251xfd_rx_ring *ring,
- const struct mcp251xfd_hw_rx_obj_canfd *hw_rx_obj)
-{
- struct net_device_stats *stats = &priv->ndev->stats;
- struct sk_buff *skb;
- struct canfd_frame *cfd;
- int err;
-
- if (hw_rx_obj->flags & MCP251XFD_OBJ_FLAGS_FDF)
- skb = alloc_canfd_skb(priv->ndev, &cfd);
- else
- skb = alloc_can_skb(priv->ndev, (struct can_frame **)&cfd);
-
- if (!skb) {
- stats->rx_dropped++;
- return 0;
- }
-
- mcp251xfd_hw_rx_obj_to_skb(priv, hw_rx_obj, skb);
- err = can_rx_offload_queue_sorted(&priv->offload, skb, hw_rx_obj->ts);
- if (err)
- stats->rx_fifo_errors++;
-
- return 0;
-}
-
-static inline int
-mcp251xfd_rx_obj_read(const struct mcp251xfd_priv *priv,
- const struct mcp251xfd_rx_ring *ring,
- struct mcp251xfd_hw_rx_obj_canfd *hw_rx_obj,
- const u8 offset, const u8 len)
-{
- const int val_bytes = regmap_get_val_bytes(priv->map_rx);
- int err;
-
- err = regmap_bulk_read(priv->map_rx,
- mcp251xfd_get_rx_obj_addr(ring, offset),
- hw_rx_obj,
- len * ring->obj_size / val_bytes);
-
- return err;
-}
-
-static int
-mcp251xfd_handle_rxif_ring(struct mcp251xfd_priv *priv,
- struct mcp251xfd_rx_ring *ring)
-{
- struct mcp251xfd_hw_rx_obj_canfd *hw_rx_obj = ring->obj;
- u8 rx_tail, len;
- int err, i;
-
- err = mcp251xfd_rx_ring_update(priv, ring);
- if (err)
- return err;
-
- while ((len = mcp251xfd_get_rx_linear_len(ring))) {
- int offset;
-
- rx_tail = mcp251xfd_get_rx_tail(ring);
-
- err = mcp251xfd_rx_obj_read(priv, ring, hw_rx_obj,
- rx_tail, len);
- if (err)
- return err;
-
- for (i = 0; i < len; i++) {
- err = mcp251xfd_handle_rxif_one(priv, ring,
- (void *)hw_rx_obj +
- i * ring->obj_size);
- if (err)
- return err;
- }
-
- /* Increment the RX FIFO tail pointer 'len' times in a
- * single SPI message.
- *
- * Note:
- * Calculate offset, so that the SPI transfer ends on
- * the last message of the uinc_xfer array, which has
- * "cs_change == 0", to properly deactivate the chip
- * select.
- */
- offset = ARRAY_SIZE(ring->uinc_xfer) - len;
- err = spi_sync_transfer(priv->spi,
- ring->uinc_xfer + offset, len);
- if (err)
- return err;
-
- ring->tail += len;
- }
-
- return 0;
-}
-
-static int mcp251xfd_handle_rxif(struct mcp251xfd_priv *priv)
-{
- struct mcp251xfd_rx_ring *ring;
- int err, n;
-
- mcp251xfd_for_each_rx_ring(priv, ring, n) {
- err = mcp251xfd_handle_rxif_ring(priv, ring);
- if (err)
- return err;
- }
-
- return 0;
-}
-
static struct sk_buff *
mcp251xfd_alloc_can_err_skb(struct mcp251xfd_priv *priv,
struct can_frame **cf, u32 *timestamp)
--- /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 <linux/bitfield.h>
+
+#include "mcp251xfd.h"
+
+static inline int
+mcp251xfd_rx_head_get_from_chip(const struct mcp251xfd_priv *priv,
+ const struct mcp251xfd_rx_ring *ring,
+ u8 *rx_head)
+{
+ u32 fifo_sta;
+ int err;
+
+ err = regmap_read(priv->map_reg, MCP251XFD_REG_FIFOSTA(ring->fifo_nr),
+ &fifo_sta);
+ if (err)
+ return err;
+
+ *rx_head = FIELD_GET(MCP251XFD_REG_FIFOSTA_FIFOCI_MASK, fifo_sta);
+
+ return 0;
+}
+
+static inline int
+mcp251xfd_rx_tail_get_from_chip(const struct mcp251xfd_priv *priv,
+ const struct mcp251xfd_rx_ring *ring,
+ u8 *rx_tail)
+{
+ u32 fifo_ua;
+ int err;
+
+ err = regmap_read(priv->map_reg, MCP251XFD_REG_FIFOUA(ring->fifo_nr),
+ &fifo_ua);
+ if (err)
+ return err;
+
+ fifo_ua -= ring->base - MCP251XFD_RAM_START;
+ *rx_tail = fifo_ua / ring->obj_size;
+
+ return 0;
+}
+
+static int
+mcp251xfd_check_rx_tail(const struct mcp251xfd_priv *priv,
+ const struct mcp251xfd_rx_ring *ring)
+{
+ u8 rx_tail_chip, rx_tail;
+ int err;
+
+ if (!IS_ENABLED(CONFIG_CAN_MCP251XFD_SANITY))
+ return 0;
+
+ err = mcp251xfd_rx_tail_get_from_chip(priv, ring, &rx_tail_chip);
+ if (err)
+ return err;
+
+ rx_tail = mcp251xfd_get_rx_tail(ring);
+ if (rx_tail_chip != rx_tail) {
+ netdev_err(priv->ndev,
+ "RX tail of chip (%d) and ours (%d) inconsistent.\n",
+ rx_tail_chip, rx_tail);
+ return -EILSEQ;
+ }
+
+ return 0;
+}
+
+static int
+mcp251xfd_rx_ring_update(const struct mcp251xfd_priv *priv,
+ struct mcp251xfd_rx_ring *ring)
+{
+ u32 new_head;
+ u8 chip_rx_head;
+ int err;
+
+ err = mcp251xfd_rx_head_get_from_chip(priv, ring, &chip_rx_head);
+ if (err)
+ return err;
+
+ /* chip_rx_head, is the next RX-Object filled by the HW.
+ * The new RX head must be >= the old head.
+ */
+ new_head = round_down(ring->head, ring->obj_num) + chip_rx_head;
+ if (new_head <= ring->head)
+ new_head += ring->obj_num;
+
+ ring->head = new_head;
+
+ return mcp251xfd_check_rx_tail(priv, ring);
+}
+
+static void
+mcp251xfd_hw_rx_obj_to_skb(const struct mcp251xfd_priv *priv,
+ const struct mcp251xfd_hw_rx_obj_canfd *hw_rx_obj,
+ struct sk_buff *skb)
+{
+ struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
+ u8 dlc;
+
+ if (hw_rx_obj->flags & MCP251XFD_OBJ_FLAGS_IDE) {
+ u32 sid, eid;
+
+ eid = FIELD_GET(MCP251XFD_OBJ_ID_EID_MASK, hw_rx_obj->id);
+ sid = FIELD_GET(MCP251XFD_OBJ_ID_SID_MASK, hw_rx_obj->id);
+
+ cfd->can_id = CAN_EFF_FLAG |
+ FIELD_PREP(MCP251XFD_REG_FRAME_EFF_EID_MASK, eid) |
+ FIELD_PREP(MCP251XFD_REG_FRAME_EFF_SID_MASK, sid);
+ } else {
+ cfd->can_id = FIELD_GET(MCP251XFD_OBJ_ID_SID_MASK,
+ hw_rx_obj->id);
+ }
+
+ dlc = FIELD_GET(MCP251XFD_OBJ_FLAGS_DLC_MASK, hw_rx_obj->flags);
+
+ /* CANFD */
+ if (hw_rx_obj->flags & MCP251XFD_OBJ_FLAGS_FDF) {
+ if (hw_rx_obj->flags & MCP251XFD_OBJ_FLAGS_ESI)
+ cfd->flags |= CANFD_ESI;
+
+ if (hw_rx_obj->flags & MCP251XFD_OBJ_FLAGS_BRS)
+ cfd->flags |= CANFD_BRS;
+
+ cfd->len = can_fd_dlc2len(dlc);
+ } else {
+ if (hw_rx_obj->flags & MCP251XFD_OBJ_FLAGS_RTR)
+ cfd->can_id |= CAN_RTR_FLAG;
+
+ can_frame_set_cc_len((struct can_frame *)cfd, dlc,
+ priv->can.ctrlmode);
+ }
+
+ if (!(hw_rx_obj->flags & MCP251XFD_OBJ_FLAGS_RTR))
+ memcpy(cfd->data, hw_rx_obj->data, cfd->len);
+
+ mcp251xfd_skb_set_timestamp(priv, skb, hw_rx_obj->ts);
+}
+
+static int
+mcp251xfd_handle_rxif_one(struct mcp251xfd_priv *priv,
+ struct mcp251xfd_rx_ring *ring,
+ const struct mcp251xfd_hw_rx_obj_canfd *hw_rx_obj)
+{
+ struct net_device_stats *stats = &priv->ndev->stats;
+ struct sk_buff *skb;
+ struct canfd_frame *cfd;
+ int err;
+
+ if (hw_rx_obj->flags & MCP251XFD_OBJ_FLAGS_FDF)
+ skb = alloc_canfd_skb(priv->ndev, &cfd);
+ else
+ skb = alloc_can_skb(priv->ndev, (struct can_frame **)&cfd);
+
+ if (!skb) {
+ stats->rx_dropped++;
+ return 0;
+ }
+
+ mcp251xfd_hw_rx_obj_to_skb(priv, hw_rx_obj, skb);
+ err = can_rx_offload_queue_sorted(&priv->offload, skb, hw_rx_obj->ts);
+ if (err)
+ stats->rx_fifo_errors++;
+
+ return 0;
+}
+
+static inline int
+mcp251xfd_rx_obj_read(const struct mcp251xfd_priv *priv,
+ const struct mcp251xfd_rx_ring *ring,
+ struct mcp251xfd_hw_rx_obj_canfd *hw_rx_obj,
+ const u8 offset, const u8 len)
+{
+ const int val_bytes = regmap_get_val_bytes(priv->map_rx);
+ int err;
+
+ err = regmap_bulk_read(priv->map_rx,
+ mcp251xfd_get_rx_obj_addr(ring, offset),
+ hw_rx_obj,
+ len * ring->obj_size / val_bytes);
+
+ return err;
+}
+
+static int
+mcp251xfd_handle_rxif_ring(struct mcp251xfd_priv *priv,
+ struct mcp251xfd_rx_ring *ring)
+{
+ struct mcp251xfd_hw_rx_obj_canfd *hw_rx_obj = ring->obj;
+ u8 rx_tail, len;
+ int err, i;
+
+ err = mcp251xfd_rx_ring_update(priv, ring);
+ if (err)
+ return err;
+
+ while ((len = mcp251xfd_get_rx_linear_len(ring))) {
+ int offset;
+
+ rx_tail = mcp251xfd_get_rx_tail(ring);
+
+ err = mcp251xfd_rx_obj_read(priv, ring, hw_rx_obj,
+ rx_tail, len);
+ if (err)
+ return err;
+
+ for (i = 0; i < len; i++) {
+ err = mcp251xfd_handle_rxif_one(priv, ring,
+ (void *)hw_rx_obj +
+ i * ring->obj_size);
+ if (err)
+ return err;
+ }
+
+ /* Increment the RX FIFO tail pointer 'len' times in a
+ * single SPI message.
+ *
+ * Note:
+ * Calculate offset, so that the SPI transfer ends on
+ * the last message of the uinc_xfer array, which has
+ * "cs_change == 0", to properly deactivate the chip
+ * select.
+ */
+ offset = ARRAY_SIZE(ring->uinc_xfer) - len;
+ err = spi_sync_transfer(priv->spi,
+ ring->uinc_xfer + offset, len);
+ if (err)
+ return err;
+
+ ring->tail += len;
+ }
+
+ return 0;
+}
+
+int mcp251xfd_handle_rxif(struct mcp251xfd_priv *priv)
+{
+ struct mcp251xfd_rx_ring *ring;
+ int err, n;
+
+ mcp251xfd_for_each_rx_ring(priv, ring, n) {
+ err = mcp251xfd_handle_rxif_ring(priv, ring);
+ if (err)
+ return err;
+ }
+
+ return 0;
+}
const void *data, size_t data_size);
u16 mcp251xfd_crc16_compute(const void *data, size_t data_size);
int mcp251xfd_regmap_init(struct mcp251xfd_priv *priv);
+int mcp251xfd_handle_rxif(struct mcp251xfd_priv *priv);
void mcp251xfd_skb_set_timestamp(const struct mcp251xfd_priv *priv,
struct sk_buff *skb, u32 timestamp);
void mcp251xfd_timestamp_init(struct mcp251xfd_priv *priv);
projects / kernel.git / commitdiff