From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next Pull networking updates from Jakub Kicinski: "Core: - Add dedicated kmem_cache for typical/small skb->head, avoid having to access struct page at kfree time, and improve memory use. - Introduce sysctl to set default RPS configuration for new netdevs. - Define Netlink protocol specification format which can be used to describe messages used by each family and auto-generate parsers. Add tools for generating kernel data structures and uAPI headers. - Expose all net/core sysctls inside netns. - Remove 4s sleep in netpoll if carrier is instantly detected on boot. - Add configurable limit of MDB entries per port, and port-vlan. - Continue populating drop reasons throughout the stack. - Retire a handful of legacy Qdiscs and classifiers. Protocols: - Support IPv4 big TCP (TSO frames larger than 64kB). - Add IP_LOCAL_PORT_RANGE socket option, to control local port range on socket by socket basis. - Track and report in procfs number of MPTCP sockets used. - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path manager. - IPv6: don't check net.ipv6.route.max_size and rely on garbage collection to free memory (similarly to IPv4). - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986). - ICMP: add per-rate limit counters. - Add support for user scanning requests in ieee802154. - Remove static WEP support. - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate reporting. - WiFi 7 EHT channel puncturing support (client & AP). BPF: - Add a rbtree data structure following the "next-gen data structure" precedent set by recently added linked list, that is, by using kfunc + kptr instead of adding a new BPF map type. - Expose XDP hints via kfuncs with initial support for RX hash and timestamp metadata. - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to better support decap on GRE tunnel devices not operating in collect metadata. - Improve x86 JIT's codegen for PROBE_MEM runtime error checks. - Remove the need for trace_printk_lock for bpf_trace_printk and bpf_trace_vprintk helpers. - Extend libbpf's bpf_tracing.h support for tracing arguments of kprobes/uprobes and syscall as a special case. - Significantly reduce the search time for module symbols by livepatch and BPF. - Enable cpumasks to be used as kptrs, which is useful for tracing programs tracking which tasks end up running on which CPUs in different time intervals. - Add support for BPF trampoline on s390x and riscv64. - Add capability to export the XDP features supported by the NIC. - Add __bpf_kfunc tag for marking kernel functions as kfuncs. - Add cgroup.memory=nobpf kernel parameter option to disable BPF memory accounting for container environments. Netfilter: - Remove the CLUSTERIP target. It has been marked as obsolete for years, and we still have WARN splats wrt races of the out-of-band /proc interface installed by this target. - Add 'destroy' commands to nf_tables. They are identical to the existing 'delete' commands, but do not return an error if the referenced object (set, chain, rule...) did not exist. Driver API: - Improve cpumask_local_spread() locality to help NICs set the right IRQ affinity on AMD platforms. - Separate C22 and C45 MDIO bus transactions more clearly. - Introduce new DCB table to control DSCP rewrite on egress. - Support configuration of Physical Layer Collision Avoidance (PLCA) Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of shared medium Ethernet. - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing preemption of low priority frames by high priority frames. - Add support for controlling MACSec offload using netlink SET. - Rework devlink instance refcounts to allow registration and de-registration under the instance lock. Split the code into multiple files, drop some of the unnecessarily granular locks and factor out common parts of netlink operation handling. - Add TX frame aggregation parameters (for USB drivers). - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning messages with notifications for debug. - Allow offloading of UDP NEW connections via act_ct. - Add support for per action HW stats in TC. - Support hardware miss to TC action (continue processing in SW from a specific point in the action chain). - Warn if old Wireless Extension user space interface is used with modern cfg80211/mac80211 drivers. Do not support Wireless Extensions for Wi-Fi 7 devices at all. Everyone should switch to using nl80211 interface instead. - Improve the CAN bit timing configuration. Use extack to return error messages directly to user space, update the SJW handling, including the definition of a new default value that will benefit CAN-FD controllers, by increasing their oscillator tolerance. New hardware / drivers: - Ethernet: - nVidia BlueField-3 support (control traffic driver) - Ethernet support for imx93 SoCs - Motorcomm yt8531 gigabit Ethernet PHY - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA) - Microchip LAN8841 PHY (incl. cable diagnostics and PTP) - Amlogic gxl MDIO mux - WiFi: - RealTek RTL8188EU (rtl8xxxu) - Qualcomm Wi-Fi 7 devices (ath12k) - CAN: - Renesas R-Car V4H Drivers: - Bluetooth: - Set Per Platform Antenna Gain (PPAG) for Intel controllers. - Ethernet NICs: - Intel (1G, igc): - support TSN / Qbv / packet scheduling features of i226 model - Intel (100G, ice): - use GNSS subsystem instead of TTY - multi-buffer XDP support - extend support for GPIO pins to E823 devices - nVidia/Mellanox: - update the shared buffer configuration on PFC commands - implement PTP adjphase function for HW offset control - TC support for Geneve and GRE with VF tunnel offload - more efficient crypto key management method - multi-port eswitch support - Netronome/Corigine: - add DCB IEEE support - support IPsec offloading for NFP3800 - Freescale/NXP (enetc): - support XDP_REDIRECT for XDP non-linear buffers - improve reconfig, avoid link flap and waiting for idle - support MAC Merge layer - Other NICs: - sfc/ef100: add basic devlink support for ef100 - ionic: rx_push mode operation (writing descriptors via MMIO) - bnxt: use the auxiliary bus abstraction for RDMA - r8169: disable ASPM and reset bus in case of tx timeout - cpsw: support QSGMII mode for J721e CPSW9G - cpts: support pulse-per-second output - ngbe: add an mdio bus driver - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing - r8152: handle devices with FW with NCM support - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation - virtio-net: support multi buffer XDP - virtio/vsock: replace virtio_vsock_pkt with sk_buff - tsnep: XDP support - Ethernet high-speed switches: - nVidia/Mellanox (mlxsw): - add support for latency TLV (in FW control messages) - Microchip (sparx5): - separate explicit and implicit traffic forwarding rules, make the implicit rules always active - add support for egress DSCP rewrite - IS0 VCAP support (Ingress Classification) - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS etc.) - ES2 VCAP support (Egress Access Control) - support for Per-Stream Filtering and Policing (802.1Q, 8.6.5.1) - Ethernet embedded switches: - Marvell (mv88e6xxx): - add MAB (port auth) offload support - enable PTP receive for mv88e6390 - NXP (ocelot): - support MAC Merge layer - support for the the vsc7512 internal copper phys - Microchip: - lan9303: convert to PHYLINK - lan966x: support TC flower filter statistics - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x - lan937x: support Credit Based Shaper configuration - ksz9477: support Energy Efficient Ethernet - other: - qca8k: convert to regmap read/write API, use bulk operations - rswitch: Improve TX timestamp accuracy - Intel WiFi (iwlwifi): - EHT (Wi-Fi 7) rate reporting - STEP equalizer support: transfer some STEP (connection to radio on platforms with integrated wifi) related parameters from the BIOS to the firmware. - Qualcomm 802.11ax WiFi (ath11k): - IPQ5018 support - Fine Timing Measurement (FTM) responder role support - channel 177 support - MediaTek WiFi (mt76): - per-PHY LED support - mt7996: EHT (Wi-Fi 7) support - Wireless Ethernet Dispatch (WED) reset support - switch to using page pool allocator - RealTek WiFi (rtw89): - support new version of Bluetooth co-existance - Mobile: - rmnet: support TX aggregation" * tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits) page_pool: add a comment explaining the fragment counter usage net: ethtool: fix __ethtool_dev_mm_supported() implementation ethtool: pse-pd: Fix double word in comments xsk: add linux/vmalloc.h to xsk.c sefltests: netdevsim: wait for devlink instance after netns removal selftest: fib_tests: Always cleanup before exit net/mlx5e: Align IPsec ASO result memory to be as required by hardware net/mlx5e: TC, Set CT miss to the specific ct action instance net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG net/mlx5: Refactor tc miss handling to a single function net/mlx5: Kconfig: Make tc offload depend on tc skb extension net/sched: flower: Support hardware miss to tc action net/sched: flower: Move filter handle initialization earlier net/sched: cls_api: Support hardware miss to tc action net/sched: Rename user cookie and act cookie sfc: fix builds without CONFIG_RTC_LIB sfc: clean up some inconsistent indentings net/mlx4_en: Introduce flexible array to silence overflow warning net: lan966x: Fix possible deadlock inside PTP net/ulp: Remove redundant ->clone() test in inet_clone_ulp(). ... --- drivers/net/can/usb/ems_usb.c | 1089 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1089 insertions(+) create mode 100644 drivers/net/can/usb/ems_usb.c (limited to 'drivers/net/can/usb/ems_usb.c') diff --git a/drivers/net/can/usb/ems_usb.c b/drivers/net/can/usb/ems_usb.c new file mode 100644 index 000000000..050c0b499 --- /dev/null +++ b/drivers/net/can/usb/ems_usb.c @@ -0,0 +1,1089 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * CAN driver for EMS Dr. Thomas Wuensche CPC-USB/ARM7 + * + * Copyright (C) 2004-2009 EMS Dr. Thomas Wuensche + */ +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +MODULE_AUTHOR("Sebastian Haas "); +MODULE_DESCRIPTION("CAN driver for EMS Dr. Thomas Wuensche CAN/USB interfaces"); +MODULE_LICENSE("GPL v2"); + +/* Control-Values for CPC_Control() Command Subject Selection */ +#define CONTR_CAN_MESSAGE 0x04 +#define CONTR_CAN_STATE 0x0C +#define CONTR_BUS_ERROR 0x1C + +/* Control Command Actions */ +#define CONTR_CONT_OFF 0 +#define CONTR_CONT_ON 1 +#define CONTR_ONCE 2 + +/* Messages from CPC to PC */ +#define CPC_MSG_TYPE_CAN_FRAME 1 /* CAN data frame */ +#define CPC_MSG_TYPE_RTR_FRAME 8 /* CAN remote frame */ +#define CPC_MSG_TYPE_CAN_PARAMS 12 /* Actual CAN parameters */ +#define CPC_MSG_TYPE_CAN_STATE 14 /* CAN state message */ +#define CPC_MSG_TYPE_EXT_CAN_FRAME 16 /* Extended CAN data frame */ +#define CPC_MSG_TYPE_EXT_RTR_FRAME 17 /* Extended remote frame */ +#define CPC_MSG_TYPE_CONTROL 19 /* change interface behavior */ +#define CPC_MSG_TYPE_CONFIRM 20 /* command processed confirmation */ +#define CPC_MSG_TYPE_OVERRUN 21 /* overrun events */ +#define CPC_MSG_TYPE_CAN_FRAME_ERROR 23 /* detected bus errors */ +#define CPC_MSG_TYPE_ERR_COUNTER 25 /* RX/TX error counter */ + +/* Messages from the PC to the CPC interface */ +#define CPC_CMD_TYPE_CAN_FRAME 1 /* CAN data frame */ +#define CPC_CMD_TYPE_CONTROL 3 /* control of interface behavior */ +#define CPC_CMD_TYPE_CAN_PARAMS 6 /* set CAN parameters */ +#define CPC_CMD_TYPE_RTR_FRAME 13 /* CAN remote frame */ +#define CPC_CMD_TYPE_CAN_STATE 14 /* CAN state message */ +#define CPC_CMD_TYPE_EXT_CAN_FRAME 15 /* Extended CAN data frame */ +#define CPC_CMD_TYPE_EXT_RTR_FRAME 16 /* Extended CAN remote frame */ +#define CPC_CMD_TYPE_CAN_EXIT 200 /* exit the CAN */ + +#define CPC_CMD_TYPE_INQ_ERR_COUNTER 25 /* request the CAN error counters */ +#define CPC_CMD_TYPE_CLEAR_MSG_QUEUE 8 /* clear CPC_MSG queue */ +#define CPC_CMD_TYPE_CLEAR_CMD_QUEUE 28 /* clear CPC_CMD queue */ + +#define CPC_CC_TYPE_SJA1000 2 /* Philips basic CAN controller */ + +#define CPC_CAN_ECODE_ERRFRAME 0x01 /* Ecode type */ + +/* Overrun types */ +#define CPC_OVR_EVENT_CAN 0x01 +#define CPC_OVR_EVENT_CANSTATE 0x02 +#define CPC_OVR_EVENT_BUSERROR 0x04 + +/* + * If the CAN controller lost a message we indicate it with the highest bit + * set in the count field. + */ +#define CPC_OVR_HW 0x80 + +/* Size of the "struct ems_cpc_msg" without the union */ +#define CPC_MSG_HEADER_LEN 11 +#define CPC_CAN_MSG_MIN_SIZE 5 + +/* Define these values to match your devices */ +#define USB_CPCUSB_VENDOR_ID 0x12D6 + +#define USB_CPCUSB_ARM7_PRODUCT_ID 0x0444 + +/* Mode register NXP LPC2119/SJA1000 CAN Controller */ +#define SJA1000_MOD_NORMAL 0x00 +#define SJA1000_MOD_RM 0x01 + +/* ECC register NXP LPC2119/SJA1000 CAN Controller */ +#define SJA1000_ECC_SEG 0x1F +#define SJA1000_ECC_DIR 0x20 +#define SJA1000_ECC_ERR 0x06 +#define SJA1000_ECC_BIT 0x00 +#define SJA1000_ECC_FORM 0x40 +#define SJA1000_ECC_STUFF 0x80 +#define SJA1000_ECC_MASK 0xc0 + +/* Status register content */ +#define SJA1000_SR_BS 0x80 +#define SJA1000_SR_ES 0x40 + +#define SJA1000_DEFAULT_OUTPUT_CONTROL 0xDA + +/* + * The device actually uses a 16MHz clock to generate the CAN clock + * but it expects SJA1000 bit settings based on 8MHz (is internally + * converted). + */ +#define EMS_USB_ARM7_CLOCK 8000000 + +#define CPC_TX_QUEUE_TRIGGER_LOW 25 +#define CPC_TX_QUEUE_TRIGGER_HIGH 35 + +/* + * CAN-Message representation in a CPC_MSG. Message object type is + * CPC_MSG_TYPE_CAN_FRAME or CPC_MSG_TYPE_RTR_FRAME or + * CPC_MSG_TYPE_EXT_CAN_FRAME or CPC_MSG_TYPE_EXT_RTR_FRAME. + */ +struct cpc_can_msg { + __le32 id; + u8 length; + u8 msg[8]; +}; + +/* Representation of the CAN parameters for the SJA1000 controller */ +struct cpc_sja1000_params { + u8 mode; + u8 acc_code0; + u8 acc_code1; + u8 acc_code2; + u8 acc_code3; + u8 acc_mask0; + u8 acc_mask1; + u8 acc_mask2; + u8 acc_mask3; + u8 btr0; + u8 btr1; + u8 outp_contr; +}; + +/* CAN params message representation */ +struct cpc_can_params { + u8 cc_type; + + /* Will support M16C CAN controller in the future */ + union { + struct cpc_sja1000_params sja1000; + } cc_params; +}; + +/* Structure for confirmed message handling */ +struct cpc_confirm { + u8 error; /* error code */ +}; + +/* Structure for overrun conditions */ +struct cpc_overrun { + u8 event; + u8 count; +}; + +/* SJA1000 CAN errors (compatible to NXP LPC2119) */ +struct cpc_sja1000_can_error { + u8 ecc; + u8 rxerr; + u8 txerr; +}; + +/* structure for CAN error conditions */ +struct cpc_can_error { + u8 ecode; + + struct { + u8 cc_type; + + /* Other controllers may also provide error code capture regs */ + union { + struct cpc_sja1000_can_error sja1000; + } regs; + } cc; +}; + +/* + * Structure containing RX/TX error counter. This structure is used to request + * the values of the CAN controllers TX and RX error counter. + */ +struct cpc_can_err_counter { + u8 rx; + u8 tx; +}; + +/* Main message type used between library and application */ +struct __packed ems_cpc_msg { + u8 type; /* type of message */ + u8 length; /* length of data within union 'msg' */ + u8 msgid; /* confirmation handle */ + __le32 ts_sec; /* timestamp in seconds */ + __le32 ts_nsec; /* timestamp in nano seconds */ + + union __packed { + u8 generic[64]; + struct cpc_can_msg can_msg; + struct cpc_can_params can_params; + struct cpc_confirm confirmation; + struct cpc_overrun overrun; + struct cpc_can_error error; + struct cpc_can_err_counter err_counter; + u8 can_state; + } msg; +}; + +/* + * Table of devices that work with this driver + * NOTE: This driver supports only CPC-USB/ARM7 (LPC2119) yet. + */ +static struct usb_device_id ems_usb_table[] = { + {USB_DEVICE(USB_CPCUSB_VENDOR_ID, USB_CPCUSB_ARM7_PRODUCT_ID)}, + {} /* Terminating entry */ +}; + +MODULE_DEVICE_TABLE(usb, ems_usb_table); + +#define RX_BUFFER_SIZE 64 +#define CPC_HEADER_SIZE 4 +#define INTR_IN_BUFFER_SIZE 4 + +#define MAX_RX_URBS 10 +#define MAX_TX_URBS 10 + +struct ems_usb; + +struct ems_tx_urb_context { + struct ems_usb *dev; + + u32 echo_index; +}; + +struct ems_usb { + struct can_priv can; /* must be the first member */ + + struct sk_buff *echo_skb[MAX_TX_URBS]; + + struct usb_device *udev; + struct net_device *netdev; + + atomic_t active_tx_urbs; + struct usb_anchor tx_submitted; + struct ems_tx_urb_context tx_contexts[MAX_TX_URBS]; + + struct usb_anchor rx_submitted; + + struct urb *intr_urb; + + u8 *tx_msg_buffer; + + u8 *intr_in_buffer; + unsigned int free_slots; /* remember number of available slots */ + + struct ems_cpc_msg active_params; /* active controller parameters */ + void *rxbuf[MAX_RX_URBS]; + dma_addr_t rxbuf_dma[MAX_RX_URBS]; +}; + +static void ems_usb_read_interrupt_callback(struct urb *urb) +{ + struct ems_usb *dev = urb->context; + struct net_device *netdev = dev->netdev; + int err; + + if (!netif_device_present(netdev)) + return; + + switch (urb->status) { + case 0: + dev->free_slots = dev->intr_in_buffer[1]; + if (dev->free_slots > CPC_TX_QUEUE_TRIGGER_HIGH && + netif_queue_stopped(netdev)) + netif_wake_queue(netdev); + break; + + case -ECONNRESET: /* unlink */ + case -ENOENT: + case -EPIPE: + case -EPROTO: + case -ESHUTDOWN: + return; + + default: + netdev_info(netdev, "Rx interrupt aborted %d\n", urb->status); + break; + } + + err = usb_submit_urb(urb, GFP_ATOMIC); + + if (err == -ENODEV) + netif_device_detach(netdev); + else if (err) + netdev_err(netdev, "failed resubmitting intr urb: %d\n", err); +} + +static void ems_usb_rx_can_msg(struct ems_usb *dev, struct ems_cpc_msg *msg) +{ + struct can_frame *cf; + struct sk_buff *skb; + int i; + struct net_device_stats *stats = &dev->netdev->stats; + + skb = alloc_can_skb(dev->netdev, &cf); + if (skb == NULL) + return; + + cf->can_id = le32_to_cpu(msg->msg.can_msg.id); + cf->len = can_cc_dlc2len(msg->msg.can_msg.length & 0xF); + + if (msg->type == CPC_MSG_TYPE_EXT_CAN_FRAME || + msg->type == CPC_MSG_TYPE_EXT_RTR_FRAME) + cf->can_id |= CAN_EFF_FLAG; + + if (msg->type == CPC_MSG_TYPE_RTR_FRAME || + msg->type == CPC_MSG_TYPE_EXT_RTR_FRAME) { + cf->can_id |= CAN_RTR_FLAG; + } else { + for (i = 0; i < cf->len; i++) + cf->data[i] = msg->msg.can_msg.msg[i]; + + stats->rx_bytes += cf->len; + } + stats->rx_packets++; + + netif_rx(skb); +} + +static void ems_usb_rx_err(struct ems_usb *dev, struct ems_cpc_msg *msg) +{ + struct can_frame *cf; + struct sk_buff *skb; + struct net_device_stats *stats = &dev->netdev->stats; + + skb = alloc_can_err_skb(dev->netdev, &cf); + if (skb == NULL) + return; + + if (msg->type == CPC_MSG_TYPE_CAN_STATE) { + u8 state = msg->msg.can_state; + + if (state & SJA1000_SR_BS) { + dev->can.state = CAN_STATE_BUS_OFF; + cf->can_id |= CAN_ERR_BUSOFF; + + dev->can.can_stats.bus_off++; + can_bus_off(dev->netdev); + } else if (state & SJA1000_SR_ES) { + dev->can.state = CAN_STATE_ERROR_WARNING; + dev->can.can_stats.error_warning++; + } else { + dev->can.state = CAN_STATE_ERROR_ACTIVE; + dev->can.can_stats.error_passive++; + } + } else if (msg->type == CPC_MSG_TYPE_CAN_FRAME_ERROR) { + u8 ecc = msg->msg.error.cc.regs.sja1000.ecc; + u8 txerr = msg->msg.error.cc.regs.sja1000.txerr; + u8 rxerr = msg->msg.error.cc.regs.sja1000.rxerr; + + /* bus error interrupt */ + dev->can.can_stats.bus_error++; + stats->rx_errors++; + + cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; + + switch (ecc & SJA1000_ECC_MASK) { + case SJA1000_ECC_BIT: + cf->data[2] |= CAN_ERR_PROT_BIT; + break; + case SJA1000_ECC_FORM: + cf->data[2] |= CAN_ERR_PROT_FORM; + break; + case SJA1000_ECC_STUFF: + cf->data[2] |= CAN_ERR_PROT_STUFF; + break; + default: + cf->data[3] = ecc & SJA1000_ECC_SEG; + break; + } + + /* Error occurred during transmission? */ + if ((ecc & SJA1000_ECC_DIR) == 0) + cf->data[2] |= CAN_ERR_PROT_TX; + + if (dev->can.state == CAN_STATE_ERROR_WARNING || + dev->can.state == CAN_STATE_ERROR_PASSIVE) { + cf->can_id |= CAN_ERR_CRTL; + cf->data[1] = (txerr > rxerr) ? + CAN_ERR_CRTL_TX_PASSIVE : CAN_ERR_CRTL_RX_PASSIVE; + } + } else if (msg->type == CPC_MSG_TYPE_OVERRUN) { + cf->can_id |= CAN_ERR_CRTL; + cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; + + stats->rx_over_errors++; + stats->rx_errors++; + } + + netif_rx(skb); +} + +/* + * callback for bulk IN urb + */ +static void ems_usb_read_bulk_callback(struct urb *urb) +{ + struct ems_usb *dev = urb->context; + struct net_device *netdev; + int retval; + + netdev = dev->netdev; + + if (!netif_device_present(netdev)) + return; + + switch (urb->status) { + case 0: /* success */ + break; + + case -ENOENT: + return; + + default: + netdev_info(netdev, "Rx URB aborted (%d)\n", urb->status); + goto resubmit_urb; + } + + if (urb->actual_length > CPC_HEADER_SIZE) { + struct ems_cpc_msg *msg; + u8 *ibuf = urb->transfer_buffer; + u8 msg_count, start; + + msg_count = ibuf[0] & ~0x80; + + start = CPC_HEADER_SIZE; + + while (msg_count) { + msg = (struct ems_cpc_msg *)&ibuf[start]; + + switch (msg->type) { + case CPC_MSG_TYPE_CAN_STATE: + /* Process CAN state changes */ + ems_usb_rx_err(dev, msg); + break; + + case CPC_MSG_TYPE_CAN_FRAME: + case CPC_MSG_TYPE_EXT_CAN_FRAME: + case CPC_MSG_TYPE_RTR_FRAME: + case CPC_MSG_TYPE_EXT_RTR_FRAME: + ems_usb_rx_can_msg(dev, msg); + break; + + case CPC_MSG_TYPE_CAN_FRAME_ERROR: + /* Process errorframe */ + ems_usb_rx_err(dev, msg); + break; + + case CPC_MSG_TYPE_OVERRUN: + /* Message lost while receiving */ + ems_usb_rx_err(dev, msg); + break; + } + + start += CPC_MSG_HEADER_LEN + msg->length; + msg_count--; + + if (start > urb->transfer_buffer_length) { + netdev_err(netdev, "format error\n"); + break; + } + } + } + +resubmit_urb: + usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 2), + urb->transfer_buffer, RX_BUFFER_SIZE, + ems_usb_read_bulk_callback, dev); + + retval = usb_submit_urb(urb, GFP_ATOMIC); + + if (retval == -ENODEV) + netif_device_detach(netdev); + else if (retval) + netdev_err(netdev, + "failed resubmitting read bulk urb: %d\n", retval); +} + +/* + * callback for bulk IN urb + */ +static void ems_usb_write_bulk_callback(struct urb *urb) +{ + struct ems_tx_urb_context *context = urb->context; + struct ems_usb *dev; + struct net_device *netdev; + + BUG_ON(!context); + + dev = context->dev; + netdev = dev->netdev; + + /* free up our allocated buffer */ + usb_free_coherent(urb->dev, urb->transfer_buffer_length, + urb->transfer_buffer, urb->transfer_dma); + + atomic_dec(&dev->active_tx_urbs); + + if (!netif_device_present(netdev)) + return; + + if (urb->status) + netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status); + + netif_trans_update(netdev); + + /* transmission complete interrupt */ + netdev->stats.tx_packets++; + netdev->stats.tx_bytes += can_get_echo_skb(netdev, context->echo_index, + NULL); + + /* Release context */ + context->echo_index = MAX_TX_URBS; + +} + +/* + * Send the given CPC command synchronously + */ +static int ems_usb_command_msg(struct ems_usb *dev, struct ems_cpc_msg *msg) +{ + int actual_length; + + /* Copy payload */ + memcpy(&dev->tx_msg_buffer[CPC_HEADER_SIZE], msg, + msg->length + CPC_MSG_HEADER_LEN); + + /* Clear header */ + memset(&dev->tx_msg_buffer[0], 0, CPC_HEADER_SIZE); + + return usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, 2), + &dev->tx_msg_buffer[0], + msg->length + CPC_MSG_HEADER_LEN + CPC_HEADER_SIZE, + &actual_length, 1000); +} + +/* + * Change CAN controllers' mode register + */ +static int ems_usb_write_mode(struct ems_usb *dev, u8 mode) +{ + dev->active_params.msg.can_params.cc_params.sja1000.mode = mode; + + return ems_usb_command_msg(dev, &dev->active_params); +} + +/* + * Send a CPC_Control command to change behaviour when interface receives a CAN + * message, bus error or CAN state changed notifications. + */ +static int ems_usb_control_cmd(struct ems_usb *dev, u8 val) +{ + struct ems_cpc_msg cmd; + + cmd.type = CPC_CMD_TYPE_CONTROL; + cmd.length = CPC_MSG_HEADER_LEN + 1; + + cmd.msgid = 0; + + cmd.msg.generic[0] = val; + + return ems_usb_command_msg(dev, &cmd); +} + +/* + * Start interface + */ +static int ems_usb_start(struct ems_usb *dev) +{ + struct net_device *netdev = dev->netdev; + int err, i; + + dev->intr_in_buffer[0] = 0; + dev->free_slots = 50; /* initial size */ + + for (i = 0; i < MAX_RX_URBS; i++) { + struct urb *urb = NULL; + u8 *buf = NULL; + dma_addr_t buf_dma; + + /* create a URB, and a buffer for it */ + urb = usb_alloc_urb(0, GFP_KERNEL); + if (!urb) { + err = -ENOMEM; + break; + } + + buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL, + &buf_dma); + if (!buf) { + netdev_err(netdev, "No memory left for USB buffer\n"); + usb_free_urb(urb); + err = -ENOMEM; + break; + } + + urb->transfer_dma = buf_dma; + + usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 2), + buf, RX_BUFFER_SIZE, + ems_usb_read_bulk_callback, dev); + urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; + usb_anchor_urb(urb, &dev->rx_submitted); + + err = usb_submit_urb(urb, GFP_KERNEL); + if (err) { + usb_unanchor_urb(urb); + usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf, + urb->transfer_dma); + usb_free_urb(urb); + break; + } + + dev->rxbuf[i] = buf; + dev->rxbuf_dma[i] = buf_dma; + + /* Drop reference, USB core will take care of freeing it */ + usb_free_urb(urb); + } + + /* Did we submit any URBs */ + if (i == 0) { + netdev_warn(netdev, "couldn't setup read URBs\n"); + return err; + } + + /* Warn if we've couldn't transmit all the URBs */ + if (i < MAX_RX_URBS) + netdev_warn(netdev, "rx performance may be slow\n"); + + /* Setup and start interrupt URB */ + usb_fill_int_urb(dev->intr_urb, dev->udev, + usb_rcvintpipe(dev->udev, 1), + dev->intr_in_buffer, + INTR_IN_BUFFER_SIZE, + ems_usb_read_interrupt_callback, dev, 1); + + err = usb_submit_urb(dev->intr_urb, GFP_KERNEL); + if (err) { + netdev_warn(netdev, "intr URB submit failed: %d\n", err); + + return err; + } + + /* CPC-USB will transfer received message to host */ + err = ems_usb_control_cmd(dev, CONTR_CAN_MESSAGE | CONTR_CONT_ON); + if (err) + goto failed; + + /* CPC-USB will transfer CAN state changes to host */ + err = ems_usb_control_cmd(dev, CONTR_CAN_STATE | CONTR_CONT_ON); + if (err) + goto failed; + + /* CPC-USB will transfer bus errors to host */ + err = ems_usb_control_cmd(dev, CONTR_BUS_ERROR | CONTR_CONT_ON); + if (err) + goto failed; + + err = ems_usb_write_mode(dev, SJA1000_MOD_NORMAL); + if (err) + goto failed; + + dev->can.state = CAN_STATE_ERROR_ACTIVE; + + return 0; + +failed: + netdev_warn(netdev, "couldn't submit control: %d\n", err); + + return err; +} + +static void unlink_all_urbs(struct ems_usb *dev) +{ + int i; + + usb_unlink_urb(dev->intr_urb); + + usb_kill_anchored_urbs(&dev->rx_submitted); + + for (i = 0; i < MAX_RX_URBS; ++i) + usb_free_coherent(dev->udev, RX_BUFFER_SIZE, + dev->rxbuf[i], dev->rxbuf_dma[i]); + + usb_kill_anchored_urbs(&dev->tx_submitted); + atomic_set(&dev->active_tx_urbs, 0); + + for (i = 0; i < MAX_TX_URBS; i++) + dev->tx_contexts[i].echo_index = MAX_TX_URBS; +} + +static int ems_usb_open(struct net_device *netdev) +{ + struct ems_usb *dev = netdev_priv(netdev); + int err; + + err = ems_usb_write_mode(dev, SJA1000_MOD_RM); + if (err) + return err; + + /* common open */ + err = open_candev(netdev); + if (err) + return err; + + /* finally start device */ + err = ems_usb_start(dev); + if (err) { + if (err == -ENODEV) + netif_device_detach(dev->netdev); + + netdev_warn(netdev, "couldn't start device: %d\n", err); + + close_candev(netdev); + + return err; + } + + + netif_start_queue(netdev); + + return 0; +} + +static netdev_tx_t ems_usb_start_xmit(struct sk_buff *skb, struct net_device *netdev) +{ + struct ems_usb *dev = netdev_priv(netdev); + struct ems_tx_urb_context *context = NULL; + struct net_device_stats *stats = &netdev->stats; + struct can_frame *cf = (struct can_frame *)skb->data; + struct ems_cpc_msg *msg; + struct urb *urb; + u8 *buf; + int i, err; + size_t size = CPC_HEADER_SIZE + CPC_MSG_HEADER_LEN + + sizeof(struct cpc_can_msg); + + if (can_dev_dropped_skb(netdev, skb)) + return NETDEV_TX_OK; + + /* create a URB, and a buffer for it, and copy the data to the URB */ + urb = usb_alloc_urb(0, GFP_ATOMIC); + if (!urb) + goto nomem; + + buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC, &urb->transfer_dma); + if (!buf) { + netdev_err(netdev, "No memory left for USB buffer\n"); + usb_free_urb(urb); + goto nomem; + } + + msg = (struct ems_cpc_msg *)&buf[CPC_HEADER_SIZE]; + + msg->msg.can_msg.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK); + msg->msg.can_msg.length = cf->len; + + if (cf->can_id & CAN_RTR_FLAG) { + msg->type = cf->can_id & CAN_EFF_FLAG ? + CPC_CMD_TYPE_EXT_RTR_FRAME : CPC_CMD_TYPE_RTR_FRAME; + + msg->length = CPC_CAN_MSG_MIN_SIZE; + } else { + msg->type = cf->can_id & CAN_EFF_FLAG ? + CPC_CMD_TYPE_EXT_CAN_FRAME : CPC_CMD_TYPE_CAN_FRAME; + + for (i = 0; i < cf->len; i++) + msg->msg.can_msg.msg[i] = cf->data[i]; + + msg->length = CPC_CAN_MSG_MIN_SIZE + cf->len; + } + + for (i = 0; i < MAX_TX_URBS; i++) { + if (dev->tx_contexts[i].echo_index == MAX_TX_URBS) { + context = &dev->tx_contexts[i]; + break; + } + } + + /* + * May never happen! When this happens we'd more URBs in flight as + * allowed (MAX_TX_URBS). + */ + if (!context) { + usb_free_coherent(dev->udev, size, buf, urb->transfer_dma); + usb_free_urb(urb); + + netdev_warn(netdev, "couldn't find free context\n"); + + return NETDEV_TX_BUSY; + } + + context->dev = dev; + context->echo_index = i; + + usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf, + size, ems_usb_write_bulk_callback, context); + urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; + usb_anchor_urb(urb, &dev->tx_submitted); + + can_put_echo_skb(skb, netdev, context->echo_index, 0); + + atomic_inc(&dev->active_tx_urbs); + + err = usb_submit_urb(urb, GFP_ATOMIC); + if (unlikely(err)) { + can_free_echo_skb(netdev, context->echo_index, NULL); + + usb_unanchor_urb(urb); + usb_free_coherent(dev->udev, size, buf, urb->transfer_dma); + + atomic_dec(&dev->active_tx_urbs); + + if (err == -ENODEV) { + netif_device_detach(netdev); + } else { + netdev_warn(netdev, "failed tx_urb %d\n", err); + + stats->tx_dropped++; + } + } else { + netif_trans_update(netdev); + + /* Slow down tx path */ + if (atomic_read(&dev->active_tx_urbs) >= MAX_TX_URBS || + dev->free_slots < CPC_TX_QUEUE_TRIGGER_LOW) { + netif_stop_queue(netdev); + } + } + + /* + * Release our reference to this URB, the USB core will eventually free + * it entirely. + */ + usb_free_urb(urb); + + return NETDEV_TX_OK; + +nomem: + dev_kfree_skb(skb); + stats->tx_dropped++; + + return NETDEV_TX_OK; +} + +static int ems_usb_close(struct net_device *netdev) +{ + struct ems_usb *dev = netdev_priv(netdev); + + /* Stop polling */ + unlink_all_urbs(dev); + + netif_stop_queue(netdev); + + /* Set CAN controller to reset mode */ + if (ems_usb_write_mode(dev, SJA1000_MOD_RM)) + netdev_warn(netdev, "couldn't stop device"); + + close_candev(netdev); + + return 0; +} + +static const struct net_device_ops ems_usb_netdev_ops = { + .ndo_open = ems_usb_open, + .ndo_stop = ems_usb_close, + .ndo_start_xmit = ems_usb_start_xmit, + .ndo_change_mtu = can_change_mtu, +}; + +static const struct ethtool_ops ems_usb_ethtool_ops = { + .get_ts_info = ethtool_op_get_ts_info, +}; + +static const struct can_bittiming_const ems_usb_bittiming_const = { + .name = KBUILD_MODNAME, + .tseg1_min = 1, + .tseg1_max = 16, + .tseg2_min = 1, + .tseg2_max = 8, + .sjw_max = 4, + .brp_min = 1, + .brp_max = 64, + .brp_inc = 1, +}; + +static int ems_usb_set_mode(struct net_device *netdev, enum can_mode mode) +{ + struct ems_usb *dev = netdev_priv(netdev); + + switch (mode) { + case CAN_MODE_START: + if (ems_usb_write_mode(dev, SJA1000_MOD_NORMAL)) + netdev_warn(netdev, "couldn't start device"); + + if (netif_queue_stopped(netdev)) + netif_wake_queue(netdev); + break; + + default: + return -EOPNOTSUPP; + } + + return 0; +} + +static int ems_usb_set_bittiming(struct net_device *netdev) +{ + struct ems_usb *dev = netdev_priv(netdev); + struct can_bittiming *bt = &dev->can.bittiming; + u8 btr0, btr1; + + btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6); + btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) | + (((bt->phase_seg2 - 1) & 0x7) << 4); + if (dev->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) + btr1 |= 0x80; + + netdev_info(netdev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1); + + dev->active_params.msg.can_params.cc_params.sja1000.btr0 = btr0; + dev->active_params.msg.can_params.cc_params.sja1000.btr1 = btr1; + + return ems_usb_command_msg(dev, &dev->active_params); +} + +static void init_params_sja1000(struct ems_cpc_msg *msg) +{ + struct cpc_sja1000_params *sja1000 = + &msg->msg.can_params.cc_params.sja1000; + + msg->type = CPC_CMD_TYPE_CAN_PARAMS; + msg->length = sizeof(struct cpc_can_params); + msg->msgid = 0; + + msg->msg.can_params.cc_type = CPC_CC_TYPE_SJA1000; + + /* Acceptance filter open */ + sja1000->acc_code0 = 0x00; + sja1000->acc_code1 = 0x00; + sja1000->acc_code2 = 0x00; + sja1000->acc_code3 = 0x00; + + /* Acceptance filter open */ + sja1000->acc_mask0 = 0xFF; + sja1000->acc_mask1 = 0xFF; + sja1000->acc_mask2 = 0xFF; + sja1000->acc_mask3 = 0xFF; + + sja1000->btr0 = 0; + sja1000->btr1 = 0; + + sja1000->outp_contr = SJA1000_DEFAULT_OUTPUT_CONTROL; + sja1000->mode = SJA1000_MOD_RM; +} + +/* + * probe function for new CPC-USB devices + */ +static int ems_usb_probe(struct usb_interface *intf, + const struct usb_device_id *id) +{ + struct net_device *netdev; + struct ems_usb *dev; + int i, err = -ENOMEM; + + netdev = alloc_candev(sizeof(struct ems_usb), MAX_TX_URBS); + if (!netdev) { + dev_err(&intf->dev, "ems_usb: Couldn't alloc candev\n"); + return -ENOMEM; + } + + dev = netdev_priv(netdev); + + dev->udev = interface_to_usbdev(intf); + dev->netdev = netdev; + + dev->can.state = CAN_STATE_STOPPED; + dev->can.clock.freq = EMS_USB_ARM7_CLOCK; + dev->can.bittiming_const = &ems_usb_bittiming_const; + dev->can.do_set_bittiming = ems_usb_set_bittiming; + dev->can.do_set_mode = ems_usb_set_mode; + dev->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES; + + netdev->netdev_ops = &ems_usb_netdev_ops; + netdev->ethtool_ops = &ems_usb_ethtool_ops; + + netdev->flags |= IFF_ECHO; /* we support local echo */ + + init_usb_anchor(&dev->rx_submitted); + + init_usb_anchor(&dev->tx_submitted); + atomic_set(&dev->active_tx_urbs, 0); + + for (i = 0; i < MAX_TX_URBS; i++) + dev->tx_contexts[i].echo_index = MAX_TX_URBS; + + dev->intr_urb = usb_alloc_urb(0, GFP_KERNEL); + if (!dev->intr_urb) + goto cleanup_candev; + + dev->intr_in_buffer = kzalloc(INTR_IN_BUFFER_SIZE, GFP_KERNEL); + if (!dev->intr_in_buffer) + goto cleanup_intr_urb; + + dev->tx_msg_buffer = kzalloc(CPC_HEADER_SIZE + + sizeof(struct ems_cpc_msg), GFP_KERNEL); + if (!dev->tx_msg_buffer) + goto cleanup_intr_in_buffer; + + usb_set_intfdata(intf, dev); + + SET_NETDEV_DEV(netdev, &intf->dev); + + init_params_sja1000(&dev->active_params); + + err = ems_usb_command_msg(dev, &dev->active_params); + if (err) { + netdev_err(netdev, "couldn't initialize controller: %d\n", err); + goto cleanup_tx_msg_buffer; + } + + err = register_candev(netdev); + if (err) { + netdev_err(netdev, "couldn't register CAN device: %d\n", err); + goto cleanup_tx_msg_buffer; + } + + return 0; + +cleanup_tx_msg_buffer: + kfree(dev->tx_msg_buffer); + +cleanup_intr_in_buffer: + kfree(dev->intr_in_buffer); + +cleanup_intr_urb: + usb_free_urb(dev->intr_urb); + +cleanup_candev: + free_candev(netdev); + + return err; +} + +/* + * called by the usb core when the device is removed from the system + */ +static void ems_usb_disconnect(struct usb_interface *intf) +{ + struct ems_usb *dev = usb_get_intfdata(intf); + + usb_set_intfdata(intf, NULL); + + if (dev) { + unregister_netdev(dev->netdev); + + unlink_all_urbs(dev); + + usb_free_urb(dev->intr_urb); + + kfree(dev->intr_in_buffer); + kfree(dev->tx_msg_buffer); + + free_candev(dev->netdev); + } +} + +/* usb specific object needed to register this driver with the usb subsystem */ +static struct usb_driver ems_usb_driver = { + .name = KBUILD_MODNAME, + .probe = ems_usb_probe, + .disconnect = ems_usb_disconnect, + .id_table = ems_usb_table, +}; + +module_usb_driver(ems_usb_driver); -- cgit v1.2.3