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/sbus/char/display7seg.c | 270 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 270 insertions(+) create mode 100644 drivers/sbus/char/display7seg.c (limited to 'drivers/sbus/char/display7seg.c') diff --git a/drivers/sbus/char/display7seg.c b/drivers/sbus/char/display7seg.c new file mode 100644 index 000000000..d93595b39 --- /dev/null +++ b/drivers/sbus/char/display7seg.c @@ -0,0 +1,270 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* display7seg.c - Driver implementation for the 7-segment display + * present on Sun Microsystems CP1400 and CP1500 + * + * Copyright (c) 2000 Eric Brower (ebrower@usa.net) + */ + +#include +#include +#include +#include +#include +#include +#include +#include /* request_region */ +#include +#include +#include +#include +#include +#include /* put_/get_user */ +#include + +#include + +#define DRIVER_NAME "d7s" +#define PFX DRIVER_NAME ": " + +static DEFINE_MUTEX(d7s_mutex); +static int sol_compat = 0; /* Solaris compatibility mode */ + +/* Solaris compatibility flag - + * The Solaris implementation omits support for several + * documented driver features (ref Sun doc 806-0180-03). + * By default, this module supports the documented driver + * abilities, rather than the Solaris implementation: + * + * 1) Device ALWAYS reverts to OBP-specified FLIPPED mode + * upon closure of device or module unload. + * 2) Device ioctls D7SIOCRD/D7SIOCWR honor toggling of + * FLIP bit + * + * If you wish the device to operate as under Solaris, + * omitting above features, set this parameter to non-zero. + */ +module_param(sol_compat, int, 0); +MODULE_PARM_DESC(sol_compat, + "Disables documented functionality omitted from Solaris driver"); + +MODULE_AUTHOR("Eric Brower "); +MODULE_DESCRIPTION("7-Segment Display driver for Sun Microsystems CP1400/1500"); +MODULE_LICENSE("GPL"); + +struct d7s { + void __iomem *regs; + bool flipped; +}; +struct d7s *d7s_device; + +/* + * Register block address- see header for details + * ----------------------------------------- + * | DP | ALARM | FLIP | 4 | 3 | 2 | 1 | 0 | + * ----------------------------------------- + * + * DP - Toggles decimal point on/off + * ALARM - Toggles "Alarm" LED green/red + * FLIP - Inverts display for upside-down mounted board + * bits 0-4 - 7-segment display contents + */ +static atomic_t d7s_users = ATOMIC_INIT(0); + +static int d7s_open(struct inode *inode, struct file *f) +{ + if (D7S_MINOR != iminor(inode)) + return -ENODEV; + atomic_inc(&d7s_users); + return 0; +} + +static int d7s_release(struct inode *inode, struct file *f) +{ + /* Reset flipped state to OBP default only if + * no other users have the device open and we + * are not operating in solaris-compat mode + */ + if (atomic_dec_and_test(&d7s_users) && !sol_compat) { + struct d7s *p = d7s_device; + u8 regval = 0; + + regval = readb(p->regs); + if (p->flipped) + regval |= D7S_FLIP; + else + regval &= ~D7S_FLIP; + writeb(regval, p->regs); + } + + return 0; +} + +static long d7s_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + struct d7s *p = d7s_device; + u8 regs = readb(p->regs); + int error = 0; + u8 ireg = 0; + + if (D7S_MINOR != iminor(file_inode(file))) + return -ENODEV; + + mutex_lock(&d7s_mutex); + switch (cmd) { + case D7SIOCWR: + /* assign device register values we mask-out D7S_FLIP + * if in sol_compat mode + */ + if (get_user(ireg, (int __user *) arg)) { + error = -EFAULT; + break; + } + if (sol_compat) { + if (regs & D7S_FLIP) + ireg |= D7S_FLIP; + else + ireg &= ~D7S_FLIP; + } + writeb(ireg, p->regs); + break; + + case D7SIOCRD: + /* retrieve device register values + * NOTE: Solaris implementation returns D7S_FLIP bit + * as toggled by user, even though it does not honor it. + * This driver will not misinform you about the state + * of your hardware while in sol_compat mode + */ + if (put_user(regs, (int __user *) arg)) { + error = -EFAULT; + break; + } + break; + + case D7SIOCTM: + /* toggle device mode-- flip display orientation */ + regs ^= D7S_FLIP; + writeb(regs, p->regs); + break; + } + mutex_unlock(&d7s_mutex); + + return error; +} + +static const struct file_operations d7s_fops = { + .owner = THIS_MODULE, + .unlocked_ioctl = d7s_ioctl, + .compat_ioctl = compat_ptr_ioctl, + .open = d7s_open, + .release = d7s_release, + .llseek = noop_llseek, +}; + +static struct miscdevice d7s_miscdev = { + .minor = D7S_MINOR, + .name = DRIVER_NAME, + .fops = &d7s_fops +}; + +static int d7s_probe(struct platform_device *op) +{ + struct device_node *opts; + int err = -EINVAL; + struct d7s *p; + u8 regs; + + if (d7s_device) + goto out; + + p = devm_kzalloc(&op->dev, sizeof(*p), GFP_KERNEL); + err = -ENOMEM; + if (!p) + goto out; + + p->regs = of_ioremap(&op->resource[0], 0, sizeof(u8), "d7s"); + if (!p->regs) { + printk(KERN_ERR PFX "Cannot map chip registers\n"); + goto out; + } + + err = misc_register(&d7s_miscdev); + if (err) { + printk(KERN_ERR PFX "Unable to acquire miscdevice minor %i\n", + D7S_MINOR); + goto out_iounmap; + } + + /* OBP option "d7s-flipped?" is honored as default for the + * device, and reset default when detached + */ + regs = readb(p->regs); + opts = of_find_node_by_path("/options"); + if (opts && + of_get_property(opts, "d7s-flipped?", NULL)) + p->flipped = true; + + if (p->flipped) + regs |= D7S_FLIP; + else + regs &= ~D7S_FLIP; + + writeb(regs, p->regs); + + printk(KERN_INFO PFX "7-Segment Display%pOF at [%s:0x%llx] %s\n", + op->dev.of_node, + (regs & D7S_FLIP) ? " (FLIPPED)" : "", + op->resource[0].start, + sol_compat ? "in sol_compat mode" : ""); + + dev_set_drvdata(&op->dev, p); + d7s_device = p; + err = 0; + of_node_put(opts); + +out: + return err; + +out_iounmap: + of_iounmap(&op->resource[0], p->regs, sizeof(u8)); + goto out; +} + +static int d7s_remove(struct platform_device *op) +{ + struct d7s *p = dev_get_drvdata(&op->dev); + u8 regs = readb(p->regs); + + /* Honor OBP d7s-flipped? unless operating in solaris-compat mode */ + if (sol_compat) { + if (p->flipped) + regs |= D7S_FLIP; + else + regs &= ~D7S_FLIP; + writeb(regs, p->regs); + } + + misc_deregister(&d7s_miscdev); + of_iounmap(&op->resource[0], p->regs, sizeof(u8)); + + return 0; +} + +static const struct of_device_id d7s_match[] = { + { + .name = "display7seg", + }, + {}, +}; +MODULE_DEVICE_TABLE(of, d7s_match); + +static struct platform_driver d7s_driver = { + .driver = { + .name = DRIVER_NAME, + .of_match_table = d7s_match, + }, + .probe = d7s_probe, + .remove = d7s_remove, +}; + +module_platform_driver(d7s_driver); -- cgit v1.2.3