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/softing/softing_main.c | 866 +++++++++++++++++++++++++++++++++ 1 file changed, 866 insertions(+) create mode 100644 drivers/net/can/softing/softing_main.c (limited to 'drivers/net/can/softing/softing_main.c') diff --git a/drivers/net/can/softing/softing_main.c b/drivers/net/can/softing/softing_main.c new file mode 100644 index 000000000..c72f505d2 --- /dev/null +++ b/drivers/net/can/softing/softing_main.c @@ -0,0 +1,866 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2008-2010 + * + * - Kurt Van Dijck, EIA Electronics + */ + +#include +#include +#include +#include + +#include "softing.h" + +#define TX_ECHO_SKB_MAX (((TXMAX+1)/2)-1) + +/* + * test is a specific CAN netdev + * is online (ie. up 'n running, not sleeping, not busoff + */ +static inline int canif_is_active(struct net_device *netdev) +{ + struct can_priv *can = netdev_priv(netdev); + + if (!netif_running(netdev)) + return 0; + return (can->state <= CAN_STATE_ERROR_PASSIVE); +} + +/* reset DPRAM */ +static inline void softing_set_reset_dpram(struct softing *card) +{ + if (card->pdat->generation >= 2) { + spin_lock_bh(&card->spin); + iowrite8(ioread8(&card->dpram[DPRAM_V2_RESET]) & ~1, + &card->dpram[DPRAM_V2_RESET]); + spin_unlock_bh(&card->spin); + } +} + +static inline void softing_clr_reset_dpram(struct softing *card) +{ + if (card->pdat->generation >= 2) { + spin_lock_bh(&card->spin); + iowrite8(ioread8(&card->dpram[DPRAM_V2_RESET]) | 1, + &card->dpram[DPRAM_V2_RESET]); + spin_unlock_bh(&card->spin); + } +} + +/* trigger the tx queue-ing */ +static netdev_tx_t softing_netdev_start_xmit(struct sk_buff *skb, + struct net_device *dev) +{ + struct softing_priv *priv = netdev_priv(dev); + struct softing *card = priv->card; + int ret; + uint8_t *ptr; + uint8_t fifo_wr, fifo_rd; + struct can_frame *cf = (struct can_frame *)skb->data; + uint8_t buf[DPRAM_TX_SIZE]; + + if (can_dev_dropped_skb(dev, skb)) + return NETDEV_TX_OK; + + spin_lock(&card->spin); + + ret = NETDEV_TX_BUSY; + if (!card->fw.up || + (card->tx.pending >= TXMAX) || + (priv->tx.pending >= TX_ECHO_SKB_MAX)) + goto xmit_done; + fifo_wr = ioread8(&card->dpram[DPRAM_TX_WR]); + fifo_rd = ioread8(&card->dpram[DPRAM_TX_RD]); + if (fifo_wr == fifo_rd) + /* fifo full */ + goto xmit_done; + memset(buf, 0, sizeof(buf)); + ptr = buf; + *ptr = CMD_TX; + if (cf->can_id & CAN_RTR_FLAG) + *ptr |= CMD_RTR; + if (cf->can_id & CAN_EFF_FLAG) + *ptr |= CMD_XTD; + if (priv->index) + *ptr |= CMD_BUS2; + ++ptr; + *ptr++ = cf->len; + *ptr++ = (cf->can_id >> 0); + *ptr++ = (cf->can_id >> 8); + if (cf->can_id & CAN_EFF_FLAG) { + *ptr++ = (cf->can_id >> 16); + *ptr++ = (cf->can_id >> 24); + } else { + /* increment 1, not 2 as you might think */ + ptr += 1; + } + if (!(cf->can_id & CAN_RTR_FLAG)) + memcpy(ptr, &cf->data[0], cf->len); + memcpy_toio(&card->dpram[DPRAM_TX + DPRAM_TX_SIZE * fifo_wr], + buf, DPRAM_TX_SIZE); + if (++fifo_wr >= DPRAM_TX_CNT) + fifo_wr = 0; + iowrite8(fifo_wr, &card->dpram[DPRAM_TX_WR]); + card->tx.last_bus = priv->index; + ++card->tx.pending; + ++priv->tx.pending; + can_put_echo_skb(skb, dev, priv->tx.echo_put, 0); + ++priv->tx.echo_put; + if (priv->tx.echo_put >= TX_ECHO_SKB_MAX) + priv->tx.echo_put = 0; + /* can_put_echo_skb() saves the skb, safe to return TX_OK */ + ret = NETDEV_TX_OK; +xmit_done: + spin_unlock(&card->spin); + if (card->tx.pending >= TXMAX) { + int j; + for (j = 0; j < ARRAY_SIZE(card->net); ++j) { + if (card->net[j]) + netif_stop_queue(card->net[j]); + } + } + if (ret != NETDEV_TX_OK) + netif_stop_queue(dev); + + return ret; +} + +/* + * shortcut for skb delivery + */ +int softing_netdev_rx(struct net_device *netdev, const struct can_frame *msg, + ktime_t ktime) +{ + struct sk_buff *skb; + struct can_frame *cf; + + skb = alloc_can_skb(netdev, &cf); + if (!skb) + return -ENOMEM; + memcpy(cf, msg, sizeof(*msg)); + skb->tstamp = ktime; + return netif_rx(skb); +} + +/* + * softing_handle_1 + * pop 1 entry from the DPRAM queue, and process + */ +static int softing_handle_1(struct softing *card) +{ + struct net_device *netdev; + struct softing_priv *priv; + ktime_t ktime; + struct can_frame msg; + int cnt = 0, lost_msg; + uint8_t fifo_rd, fifo_wr, cmd; + uint8_t *ptr; + uint32_t tmp_u32; + uint8_t buf[DPRAM_RX_SIZE]; + + memset(&msg, 0, sizeof(msg)); + /* test for lost msgs */ + lost_msg = ioread8(&card->dpram[DPRAM_RX_LOST]); + if (lost_msg) { + int j; + /* reset condition */ + iowrite8(0, &card->dpram[DPRAM_RX_LOST]); + /* prepare msg */ + msg.can_id = CAN_ERR_FLAG | CAN_ERR_CRTL; + msg.len = CAN_ERR_DLC; + msg.data[1] = CAN_ERR_CRTL_RX_OVERFLOW; + /* + * service to all buses, we don't know which it was applicable + * but only service buses that are online + */ + for (j = 0; j < ARRAY_SIZE(card->net); ++j) { + netdev = card->net[j]; + if (!netdev) + continue; + if (!canif_is_active(netdev)) + /* a dead bus has no overflows */ + continue; + ++netdev->stats.rx_over_errors; + softing_netdev_rx(netdev, &msg, 0); + } + /* prepare for other use */ + memset(&msg, 0, sizeof(msg)); + ++cnt; + } + + fifo_rd = ioread8(&card->dpram[DPRAM_RX_RD]); + fifo_wr = ioread8(&card->dpram[DPRAM_RX_WR]); + + if (++fifo_rd >= DPRAM_RX_CNT) + fifo_rd = 0; + if (fifo_wr == fifo_rd) + return cnt; + + memcpy_fromio(buf, &card->dpram[DPRAM_RX + DPRAM_RX_SIZE*fifo_rd], + DPRAM_RX_SIZE); + mb(); + /* trigger dual port RAM */ + iowrite8(fifo_rd, &card->dpram[DPRAM_RX_RD]); + + ptr = buf; + cmd = *ptr++; + if (cmd == 0xff) + /* not quite useful, probably the card has got out */ + return 0; + netdev = card->net[0]; + if (cmd & CMD_BUS2) + netdev = card->net[1]; + priv = netdev_priv(netdev); + + if (cmd & CMD_ERR) { + uint8_t can_state, state; + + state = *ptr++; + + msg.can_id = CAN_ERR_FLAG; + msg.len = CAN_ERR_DLC; + + if (state & SF_MASK_BUSOFF) { + can_state = CAN_STATE_BUS_OFF; + msg.can_id |= CAN_ERR_BUSOFF; + state = STATE_BUSOFF; + } else if (state & SF_MASK_EPASSIVE) { + can_state = CAN_STATE_ERROR_PASSIVE; + msg.can_id |= CAN_ERR_CRTL; + msg.data[1] = CAN_ERR_CRTL_TX_PASSIVE; + state = STATE_EPASSIVE; + } else { + can_state = CAN_STATE_ERROR_ACTIVE; + msg.can_id |= CAN_ERR_CRTL; + state = STATE_EACTIVE; + } + /* update DPRAM */ + iowrite8(state, &card->dpram[priv->index ? + DPRAM_INFO_BUSSTATE2 : DPRAM_INFO_BUSSTATE]); + /* timestamp */ + tmp_u32 = le32_to_cpup((void *)ptr); + ktime = softing_raw2ktime(card, tmp_u32); + + ++netdev->stats.rx_errors; + /* update internal status */ + if (can_state != priv->can.state) { + priv->can.state = can_state; + if (can_state == CAN_STATE_ERROR_PASSIVE) + ++priv->can.can_stats.error_passive; + else if (can_state == CAN_STATE_BUS_OFF) { + /* this calls can_close_cleanup() */ + ++priv->can.can_stats.bus_off; + can_bus_off(netdev); + netif_stop_queue(netdev); + } + /* trigger socketcan */ + softing_netdev_rx(netdev, &msg, ktime); + } + + } else { + if (cmd & CMD_RTR) + msg.can_id |= CAN_RTR_FLAG; + msg.len = can_cc_dlc2len(*ptr++); + if (cmd & CMD_XTD) { + msg.can_id |= CAN_EFF_FLAG; + msg.can_id |= le32_to_cpup((void *)ptr); + ptr += 4; + } else { + msg.can_id |= le16_to_cpup((void *)ptr); + ptr += 2; + } + /* timestamp */ + tmp_u32 = le32_to_cpup((void *)ptr); + ptr += 4; + ktime = softing_raw2ktime(card, tmp_u32); + if (!(msg.can_id & CAN_RTR_FLAG)) + memcpy(&msg.data[0], ptr, 8); + /* update socket */ + if (cmd & CMD_ACK) { + /* acknowledge, was tx msg */ + struct sk_buff *skb; + skb = priv->can.echo_skb[priv->tx.echo_get]; + if (skb) + skb->tstamp = ktime; + ++netdev->stats.tx_packets; + netdev->stats.tx_bytes += + can_get_echo_skb(netdev, priv->tx.echo_get, + NULL); + ++priv->tx.echo_get; + if (priv->tx.echo_get >= TX_ECHO_SKB_MAX) + priv->tx.echo_get = 0; + if (priv->tx.pending) + --priv->tx.pending; + if (card->tx.pending) + --card->tx.pending; + } else { + int ret; + + ret = softing_netdev_rx(netdev, &msg, ktime); + if (ret == NET_RX_SUCCESS) { + ++netdev->stats.rx_packets; + if (!(msg.can_id & CAN_RTR_FLAG)) + netdev->stats.rx_bytes += msg.len; + } else { + ++netdev->stats.rx_dropped; + } + } + } + ++cnt; + return cnt; +} + +/* + * real interrupt handler + */ +static irqreturn_t softing_irq_thread(int irq, void *dev_id) +{ + struct softing *card = (struct softing *)dev_id; + struct net_device *netdev; + struct softing_priv *priv; + int j, offset, work_done; + + work_done = 0; + spin_lock_bh(&card->spin); + while (softing_handle_1(card) > 0) { + ++card->irq.svc_count; + ++work_done; + } + spin_unlock_bh(&card->spin); + /* resume tx queue's */ + offset = card->tx.last_bus; + for (j = 0; j < ARRAY_SIZE(card->net); ++j) { + if (card->tx.pending >= TXMAX) + break; + netdev = card->net[(j + offset + 1) % card->pdat->nbus]; + if (!netdev) + continue; + priv = netdev_priv(netdev); + if (!canif_is_active(netdev)) + /* it makes no sense to wake dead buses */ + continue; + if (priv->tx.pending >= TX_ECHO_SKB_MAX) + continue; + ++work_done; + netif_wake_queue(netdev); + } + return work_done ? IRQ_HANDLED : IRQ_NONE; +} + +/* + * interrupt routines: + * schedule the 'real interrupt handler' + */ +static irqreturn_t softing_irq_v2(int irq, void *dev_id) +{ + struct softing *card = (struct softing *)dev_id; + uint8_t ir; + + ir = ioread8(&card->dpram[DPRAM_V2_IRQ_TOHOST]); + iowrite8(0, &card->dpram[DPRAM_V2_IRQ_TOHOST]); + return (1 == ir) ? IRQ_WAKE_THREAD : IRQ_NONE; +} + +static irqreturn_t softing_irq_v1(int irq, void *dev_id) +{ + struct softing *card = (struct softing *)dev_id; + uint8_t ir; + + ir = ioread8(&card->dpram[DPRAM_IRQ_TOHOST]); + iowrite8(0, &card->dpram[DPRAM_IRQ_TOHOST]); + return ir ? IRQ_WAKE_THREAD : IRQ_NONE; +} + +/* + * netdev/candev interoperability + */ +static int softing_netdev_open(struct net_device *ndev) +{ + int ret; + + /* check or determine and set bittime */ + ret = open_candev(ndev); + if (ret) + return ret; + + ret = softing_startstop(ndev, 1); + if (ret < 0) + close_candev(ndev); + + return ret; +} + +static int softing_netdev_stop(struct net_device *ndev) +{ + netif_stop_queue(ndev); + + /* softing cycle does close_candev() */ + return softing_startstop(ndev, 0); +} + +static int softing_candev_set_mode(struct net_device *ndev, enum can_mode mode) +{ + int ret; + + switch (mode) { + case CAN_MODE_START: + /* softing_startstop does close_candev() */ + ret = softing_startstop(ndev, 1); + return ret; + case CAN_MODE_STOP: + case CAN_MODE_SLEEP: + return -EOPNOTSUPP; + } + return 0; +} + +/* + * Softing device management helpers + */ +int softing_enable_irq(struct softing *card, int enable) +{ + int ret; + + if (!card->irq.nr) { + return 0; + } else if (card->irq.requested && !enable) { + free_irq(card->irq.nr, card); + card->irq.requested = 0; + } else if (!card->irq.requested && enable) { + ret = request_threaded_irq(card->irq.nr, + (card->pdat->generation >= 2) ? + softing_irq_v2 : softing_irq_v1, + softing_irq_thread, IRQF_SHARED, + dev_name(&card->pdev->dev), card); + if (ret) { + dev_alert(&card->pdev->dev, + "request_threaded_irq(%u) failed\n", + card->irq.nr); + return ret; + } + card->irq.requested = 1; + } + return 0; +} + +static void softing_card_shutdown(struct softing *card) +{ + int fw_up = 0; + + if (mutex_lock_interruptible(&card->fw.lock)) { + /* return -ERESTARTSYS */; + } + fw_up = card->fw.up; + card->fw.up = 0; + + if (card->irq.requested && card->irq.nr) { + free_irq(card->irq.nr, card); + card->irq.requested = 0; + } + if (fw_up) { + if (card->pdat->enable_irq) + card->pdat->enable_irq(card->pdev, 0); + softing_set_reset_dpram(card); + if (card->pdat->reset) + card->pdat->reset(card->pdev, 1); + } + mutex_unlock(&card->fw.lock); +} + +static int softing_card_boot(struct softing *card) +{ + int ret, j; + static const uint8_t stream[] = { + 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, }; + unsigned char back[sizeof(stream)]; + + if (mutex_lock_interruptible(&card->fw.lock)) + return -ERESTARTSYS; + if (card->fw.up) { + mutex_unlock(&card->fw.lock); + return 0; + } + /* reset board */ + if (card->pdat->enable_irq) + card->pdat->enable_irq(card->pdev, 1); + /* boot card */ + softing_set_reset_dpram(card); + if (card->pdat->reset) + card->pdat->reset(card->pdev, 1); + for (j = 0; (j + sizeof(stream)) < card->dpram_size; + j += sizeof(stream)) { + + memcpy_toio(&card->dpram[j], stream, sizeof(stream)); + /* flush IO cache */ + mb(); + memcpy_fromio(back, &card->dpram[j], sizeof(stream)); + + if (!memcmp(back, stream, sizeof(stream))) + continue; + /* memory is not equal */ + dev_alert(&card->pdev->dev, "dpram failed at 0x%04x\n", j); + ret = -EIO; + goto failed; + } + wmb(); + /* load boot firmware */ + ret = softing_load_fw(card->pdat->boot.fw, card, card->dpram, + card->dpram_size, + card->pdat->boot.offs - card->pdat->boot.addr); + if (ret < 0) + goto failed; + /* load loader firmware */ + ret = softing_load_fw(card->pdat->load.fw, card, card->dpram, + card->dpram_size, + card->pdat->load.offs - card->pdat->load.addr); + if (ret < 0) + goto failed; + + if (card->pdat->reset) + card->pdat->reset(card->pdev, 0); + softing_clr_reset_dpram(card); + ret = softing_bootloader_command(card, 0, "card boot"); + if (ret < 0) + goto failed; + ret = softing_load_app_fw(card->pdat->app.fw, card); + if (ret < 0) + goto failed; + + ret = softing_chip_poweron(card); + if (ret < 0) + goto failed; + + card->fw.up = 1; + mutex_unlock(&card->fw.lock); + return 0; +failed: + card->fw.up = 0; + if (card->pdat->enable_irq) + card->pdat->enable_irq(card->pdev, 0); + softing_set_reset_dpram(card); + if (card->pdat->reset) + card->pdat->reset(card->pdev, 1); + mutex_unlock(&card->fw.lock); + return ret; +} + +/* + * netdev sysfs + */ +static ssize_t show_chip(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct net_device *ndev = to_net_dev(dev); + struct softing_priv *priv = netdev2softing(ndev); + + return sprintf(buf, "%i\n", priv->chip); +} + +static ssize_t show_output(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct net_device *ndev = to_net_dev(dev); + struct softing_priv *priv = netdev2softing(ndev); + + return sprintf(buf, "0x%02x\n", priv->output); +} + +static ssize_t store_output(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct net_device *ndev = to_net_dev(dev); + struct softing_priv *priv = netdev2softing(ndev); + struct softing *card = priv->card; + unsigned long val; + int ret; + + ret = kstrtoul(buf, 0, &val); + if (ret < 0) + return ret; + val &= 0xFF; + + ret = mutex_lock_interruptible(&card->fw.lock); + if (ret) + return -ERESTARTSYS; + if (netif_running(ndev)) { + mutex_unlock(&card->fw.lock); + return -EBUSY; + } + priv->output = val; + mutex_unlock(&card->fw.lock); + return count; +} + +static const DEVICE_ATTR(chip, 0444, show_chip, NULL); +static const DEVICE_ATTR(output, 0644, show_output, store_output); + +static const struct attribute *const netdev_sysfs_attrs[] = { + &dev_attr_chip.attr, + &dev_attr_output.attr, + NULL, +}; +static const struct attribute_group netdev_sysfs_group = { + .name = NULL, + .attrs = (struct attribute **)netdev_sysfs_attrs, +}; + +static const struct net_device_ops softing_netdev_ops = { + .ndo_open = softing_netdev_open, + .ndo_stop = softing_netdev_stop, + .ndo_start_xmit = softing_netdev_start_xmit, + .ndo_change_mtu = can_change_mtu, +}; + +static const struct ethtool_ops softing_ethtool_ops = { + .get_ts_info = ethtool_op_get_ts_info, +}; + +static const struct can_bittiming_const softing_btr_const = { + .name = KBUILD_MODNAME, + .tseg1_min = 1, + .tseg1_max = 16, + .tseg2_min = 1, + .tseg2_max = 8, + .sjw_max = 4, /* overruled */ + .brp_min = 1, + .brp_max = 32, /* overruled */ + .brp_inc = 1, +}; + + +static struct net_device *softing_netdev_create(struct softing *card, + uint16_t chip_id) +{ + struct net_device *netdev; + struct softing_priv *priv; + + netdev = alloc_candev(sizeof(*priv), TX_ECHO_SKB_MAX); + if (!netdev) { + dev_alert(&card->pdev->dev, "alloc_candev failed\n"); + return NULL; + } + priv = netdev_priv(netdev); + priv->netdev = netdev; + priv->card = card; + memcpy(&priv->btr_const, &softing_btr_const, sizeof(priv->btr_const)); + priv->btr_const.brp_max = card->pdat->max_brp; + priv->btr_const.sjw_max = card->pdat->max_sjw; + priv->can.bittiming_const = &priv->btr_const; + priv->can.clock.freq = 8000000; + priv->chip = chip_id; + priv->output = softing_default_output(netdev); + SET_NETDEV_DEV(netdev, &card->pdev->dev); + + netdev->flags |= IFF_ECHO; + netdev->netdev_ops = &softing_netdev_ops; + netdev->ethtool_ops = &softing_ethtool_ops; + priv->can.do_set_mode = softing_candev_set_mode; + priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES; + + return netdev; +} + +static int softing_netdev_register(struct net_device *netdev) +{ + int ret; + + ret = register_candev(netdev); + if (ret) { + dev_alert(&netdev->dev, "register failed\n"); + return ret; + } + if (sysfs_create_group(&netdev->dev.kobj, &netdev_sysfs_group) < 0) + netdev_alert(netdev, "sysfs group failed\n"); + + return 0; +} + +static void softing_netdev_cleanup(struct net_device *netdev) +{ + sysfs_remove_group(&netdev->dev.kobj, &netdev_sysfs_group); + unregister_candev(netdev); + free_candev(netdev); +} + +/* + * sysfs for Platform device + */ +#define DEV_ATTR_RO(name, member) \ +static ssize_t show_##name(struct device *dev, \ + struct device_attribute *attr, char *buf) \ +{ \ + struct softing *card = dev_get_drvdata(dev); \ + return sprintf(buf, "%u\n", card->member); \ +} \ +static DEVICE_ATTR(name, 0444, show_##name, NULL) + +#define DEV_ATTR_RO_STR(name, member) \ +static ssize_t show_##name(struct device *dev, \ + struct device_attribute *attr, char *buf) \ +{ \ + struct softing *card = dev_get_drvdata(dev); \ + return sprintf(buf, "%s\n", card->member); \ +} \ +static DEVICE_ATTR(name, 0444, show_##name, NULL) + +DEV_ATTR_RO(serial, id.serial); +DEV_ATTR_RO_STR(firmware, pdat->app.fw); +DEV_ATTR_RO(firmware_version, id.fw_version); +DEV_ATTR_RO_STR(hardware, pdat->name); +DEV_ATTR_RO(hardware_version, id.hw_version); +DEV_ATTR_RO(license, id.license); + +static struct attribute *softing_pdev_attrs[] = { + &dev_attr_serial.attr, + &dev_attr_firmware.attr, + &dev_attr_firmware_version.attr, + &dev_attr_hardware.attr, + &dev_attr_hardware_version.attr, + &dev_attr_license.attr, + NULL, +}; + +static const struct attribute_group softing_pdev_group = { + .name = NULL, + .attrs = softing_pdev_attrs, +}; + +/* + * platform driver + */ +static int softing_pdev_remove(struct platform_device *pdev) +{ + struct softing *card = platform_get_drvdata(pdev); + int j; + + /* first, disable card*/ + softing_card_shutdown(card); + + for (j = 0; j < ARRAY_SIZE(card->net); ++j) { + if (!card->net[j]) + continue; + softing_netdev_cleanup(card->net[j]); + card->net[j] = NULL; + } + sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group); + + iounmap(card->dpram); + kfree(card); + return 0; +} + +static int softing_pdev_probe(struct platform_device *pdev) +{ + const struct softing_platform_data *pdat = dev_get_platdata(&pdev->dev); + struct softing *card; + struct net_device *netdev; + struct softing_priv *priv; + struct resource *pres; + int ret; + int j; + + if (!pdat) { + dev_warn(&pdev->dev, "no platform data\n"); + return -EINVAL; + } + if (pdat->nbus > ARRAY_SIZE(card->net)) { + dev_warn(&pdev->dev, "%u nets??\n", pdat->nbus); + return -EINVAL; + } + + card = kzalloc(sizeof(*card), GFP_KERNEL); + if (!card) + return -ENOMEM; + card->pdat = pdat; + card->pdev = pdev; + platform_set_drvdata(pdev, card); + mutex_init(&card->fw.lock); + spin_lock_init(&card->spin); + + ret = -EINVAL; + pres = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!pres) + goto platform_resource_failed; + card->dpram_phys = pres->start; + card->dpram_size = resource_size(pres); + card->dpram = ioremap(card->dpram_phys, card->dpram_size); + if (!card->dpram) { + dev_alert(&card->pdev->dev, "dpram ioremap failed\n"); + goto ioremap_failed; + } + + pres = platform_get_resource(pdev, IORESOURCE_IRQ, 0); + if (pres) + card->irq.nr = pres->start; + + /* reset card */ + ret = softing_card_boot(card); + if (ret < 0) { + dev_alert(&pdev->dev, "failed to boot\n"); + goto boot_failed; + } + + /* only now, the chip's are known */ + card->id.freq = card->pdat->freq; + + ret = sysfs_create_group(&pdev->dev.kobj, &softing_pdev_group); + if (ret < 0) { + dev_alert(&card->pdev->dev, "sysfs failed\n"); + goto sysfs_failed; + } + + for (j = 0; j < ARRAY_SIZE(card->net); ++j) { + card->net[j] = netdev = + softing_netdev_create(card, card->id.chip[j]); + if (!netdev) { + dev_alert(&pdev->dev, "failed to make can[%i]", j); + ret = -ENOMEM; + goto netdev_failed; + } + netdev->dev_id = j; + priv = netdev_priv(card->net[j]); + priv->index = j; + ret = softing_netdev_register(netdev); + if (ret) { + free_candev(netdev); + card->net[j] = NULL; + dev_alert(&card->pdev->dev, + "failed to register can[%i]\n", j); + goto netdev_failed; + } + } + dev_info(&card->pdev->dev, "%s ready.\n", card->pdat->name); + return 0; + +netdev_failed: + for (j = 0; j < ARRAY_SIZE(card->net); ++j) { + if (!card->net[j]) + continue; + softing_netdev_cleanup(card->net[j]); + } + sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group); +sysfs_failed: + softing_card_shutdown(card); +boot_failed: + iounmap(card->dpram); +ioremap_failed: +platform_resource_failed: + kfree(card); + return ret; +} + +static struct platform_driver softing_driver = { + .driver = { + .name = KBUILD_MODNAME, + }, + .probe = softing_pdev_probe, + .remove = softing_pdev_remove, +}; + +module_platform_driver(softing_driver); + +MODULE_ALIAS("platform:softing"); +MODULE_DESCRIPTION("Softing DPRAM CAN driver"); +MODULE_AUTHOR("Kurt Van Dijck "); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3